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DE-102021117585-B4 - SENSOR DEVICE, SENSOR SYSTEM AND MICROCONTROL

DE102021117585B4DE 102021117585 B4DE102021117585 B4DE 102021117585B4DE-102021117585-B4

Abstract

Sensor device (10) comprising the following: at least one first sensor element (13) with a first detection direction configured to generate at least one first sensor signal (Sx, Sx1) based on the detection of a first magnetic field component of a varying magnetic field oriented in the first detection direction; at least one second sensor element (14) with a second detection direction, configured to generate at least one second sensor signal (Sy, Sx2) based on the detection of a second magnetic field component of the varying magnetic field, which is oriented in the second detection direction; a signal processing circuit (15, 16) configured to generate a first pulse signal (S1) based on the at least one first sensor signal (Sx, Sx1) and to generate a second pulse signal (S2) based on the at least one second sensor signal (Sy, Sx2); a fault detector (18) configured to detect at least one fault and to generate a fault signal indicating the at least one fault in response to the detection of the at least one fault; and an output generator (17) configured to receive the first pulse signal (S1) and the second pulse signal (S2), the error signal based on a first condition that the error detector (18) detects the at least one error, and simultaneously output a first output signal (OUT1) and a second output signal (OUT2), where, based on a second condition that the fault detector (18) does not detect the at least one fault, the output generator is configured to use the first pulse signal (S1) as the first output signal (OUT1) to output and to output the second pulse signal (S2) as the second output signal (OUT2), and wherein, in response to the first condition being satisfied, the output generator (18) is configured to keep the first output signal (OUT1) in a steady state and to output the second pulse signal (S2) as the second output signal (OUT2), wherein: the first pulse signal (S1) comprises several transition edges that define several first pulses, the second pulse signal (S2) comprises several transition edges that define multiple second pulses, and the first several transition flanks are synchronized with the second several transition flanks.

Inventors

  • Stephan Leisenheimer
  • Romain Peron
  • Sebastian Maerz
  • Konrad Kapser
  • Rainer Kling

Assignees

  • INFINEON TECHNOLOGIES AG

Dates

Publication Date
20260513
Application Date
20210707
Priority Date
20200708

Claims (19)

  1. Sensor device (10) comprising: at least one first sensor element (13) with a first detection direction, configured to generate at least one first sensor signal (Sx, Sx1) based on the detection of a first magnetic field component of a varying magnetic field oriented in the first detection direction; at least one second sensor element (14) with a second detection direction, configured to generate at least one second sensor signal (Sy, Sx2) based on the detection of a second magnetic field component of the varying magnetic field oriented in the second detection direction; a signal processing circuit (15, 16) configured to generate a first pulse signal (S1) based on the at least one first sensor signal (Sx, Sx1) and a second pulse signal (S2) based on the at least one second sensor signal (Sy, Sx2); a fault detector (18) configured to detect at least one fault and to generate a fault signal indicating the at least one fault in response to the detection of the at least one fault; and an output generator (17) configured to receive the first pulse signal (S1) and the second pulse signal (S2), to receive the fault signal based on a first condition that the fault detector (18) detects the at least one fault, and simultaneously output a first output signal (OUT1) and a second output signal (OUT2), whereby, based on a second condition that the fault detector (18) does not detect the at least one fault, the output generator is configured to output the first pulse signal (S1) as the first output signal (OUT1) and to output the second pulse signal (S2) as the second output signal (OUT2), and whereby, in response to the first condition being satisfied, the output generator (18) is configured to maintain the first output signal (OUT1) in a steady state and to output the second pulse signal (S2) as the second output signal (OUT2), wherein: the first pulse signal (S1) comprises several transition edges, which include several first pulses define, the second pulse signal (S2) comprises several transition edges that define several second pulses, and the first several transition edges are synchronized with the second several transition edges.
  2. Sensor device (10) according Claim 1 , wherein, while the second condition is satisfied: the first output signal (OUT1) comprises several transition edges defining several first pulses, the second output signal (OUT2) comprises several transition edges defining several second pulses, and the first several transition edges are synchronized with the second several transition edges, wherein optionally, while the second condition is satisfied, each of the first several transition edges is synchronized with a corresponding transition edge of the second several transition edges.
  3. Sensor device (10) according Claim 1 or 2 , wherein the varying magnetic field is caused by a rotational movement of a target object, such that the first sensor signal (Sx, Sx1) and the second sensor signal (Sy, Sx2) are sinusoidal signals, wherein the signal processing circuit (15, 16) is configured to determine a phase shift direction of a phase shift between the at least one first sensor signal (Sx, Sx1) and the at least one second sensor signal (Sy, Sx2), and to generate the second pulse signal based on the determined phase shift direction, wherein optionally, while the first condition or the second condition is satisfied, the second pulse signal (S2) provides velocity information indicating a velocity at which the varying magnetic field varies, corresponding to a rotational speed of the target object, and direction change information indicating a change in the direction of the varying magnetic field, corresponding to a direction of rotation of the target object.
  4. Sensor device (10) according Claim 3 , where: the first pulse signal (S1) indicates a speed at which the varying magnetic field varies, corresponding to a rotational speed of the target object, and the second pulse signal (S2) indicates a direction in which the varying magnetic field varies, corresponding to a direction of rotation of the target object.
  5. Sensor device (10) according Claim 4 , wherein the signal processing circuit (15, 16) is configured to determine whether the direction in which the varying magnetic field varies is in a first direction or a second direction, to generate the first pulse signal (S1) and the second pulse signal (S2) so that they are in phase with each other in response to the determination that the direction is in the first direction, and to generate the first pulse signal (S1) and the second pulse signal (S2) so that they are phase-shifted by 180° with each other in response to the determination that the direction is in the second direction.
  6. Sensor device (10) according to one of the Claims 1 until 5 , wherein: - while the first condition is satisfied, the second output signal (Out2) provides velocity information indicating a speed at which the varying magnetic field varies, and direction change information indicating a change in the direction of the varying magnetic field, and/or - the sensor device (10) is a semiconductor chip with a first output pin configured to output the first output signal (OUT1) and a second output pin configured to output the second output signal (OUT2), and/or - the first sensing direction and the second sensing direction are either the same direction or different directions.
  7. Sensor system (100; 200A; 200B; 300) comprising: a sensor device (10) comprising: at least one first sensor element (13) configured to generate at least one first sensor signal (Sx, Sx1) based on the detection of a first magnetic field component of a varying magnetic field; at least one second sensor element (14) configured to generate at least one second sensor signal (Sy, Sx2) based on the detection of an aligned second magnetic field component of the varying magnetic field; a signal processing circuit (15, 16) configured to generate a first pulse signal (S1) based on the at least one first sensor signal (Sx, Sx1) and to generate a second pulse signal (S2) based on the at least one second sensor signal (Sy, Sx2); wherein: the first pulse signal (S1) comprises several transition edges defining several first pulses, the second pulse signal (S2) comprises several transition edges defining several second pulses, and the first several transition edges are synchronized with the second several transition edges; a fault detector (18) configured to detect at least one fault and to generate a fault signal indicating the at least one fault in response to the detection of the at least one fault; and an output generator (17) configured to receive the first pulse signal (S1) and the second pulse signal (S2), to receive the fault signal based on a first condition that the fault detector detects the at least one fault, and simultaneously to generate a first output signal to output a first output signal (OUT1) and a second output signal (OUT2), wherein, based on a second condition that the fault detector does not detect the at least one fault, the output generator (17) is configured to output the first pulse signal (S1) as the first output signal (OUT1) and to output the second pulse signal (S2) as the second output signal (OUT2), and wherein, in response to the first condition being met, the output generator (17) is configured to keep the first output signal (OUT1) in a steady state and to output the second pulse signal (S2) as the second output signal (OUT2); and a microcontroller (30) coupled to the sensor device (10), wherein the microcontroller (30) is configured to receive the first output signal (OUT1) and the second output signal (OUT2), and to detect the at least one fault based on the first output signal (OUT1) and the second output signal (OUT2).
  8. Microcontroller (30) comprising: a first input pin (31) configured to receive a first signal (OUT1) from a sensor device (10), wherein the first signal (OUT1) is a first pulse signal at least under normal conditions; a second input pin (32) configured to receive a second signal from the sensor device (10), wherein the second signal (OUT2) is a second pulse signal at least under normal conditions, wherein the first signal (OUT1) and the second signal (OUT2) are received simultaneously and together specify either the normal condition, a first fault condition, or a second fault condition, wherein: the first pulse signal (S1) comprises several transition edges defining multiple first pulses, the second pulse signal (S2) comprises several transition edges defining multiple second pulses, and the first multiple transition edges are synchronized with the second multiple transition edges; and at least one processor configured to evaluate the first signal (OUT1) and the second signal (OUT2), and to detect the normal condition, the first fault condition, or the second fault condition based on the evaluated first signal (OUT1) and the evaluated second signal (OUT2), whereby the at least one processor is configured to detect transition edges of the first signal (OUT1) and the second signal (OUT2), whereby the at least one processor is configured, for each detected transition edge of the first signal (OUT1) and the second signal (OUT2), to determine whether two synchronous edges are detected, wherein the two synchronous edges comprise that a first transition edge of the first signal is synchronous with a second transition edge of the second signal, whereby, under a condition that the two synchronous edges are detected, the at least one processor is configured to determine that the normal condition is present, and whereby, under a condition that the two synchronous edges are not detected, at least one processor is configured to detect that either the first error condition or the second error condition has occurred.
  9. Microcontroller (30) according to Claim 8 , wherein: based on the condition that the two synchronous edges are not detected, the at least one processor is configured to determine which of the first and second signals is in a steady state; if the first signal is in a steady state, the at least one processor is configured to determine that the first error condition has occurred; and if the second signal is in a steady state, the at least one processor is configured to determine that the second error condition has occurred, wherein optionally: based on the condition that the two synchronous edges are detected, the first signal includes first sensor data and the second signal includes second sensor data; based on a condition that the two synchronous edges are not detected and the first signal is in a steady state, the first signal indicates the first error condition and the second signal includes the second sensor data; and based on a condition that the two synchronous edges are not detected and the second signal is in a steady state The first signal contains the first sensor data, and the second signal indicates the second error condition.
  10. Microcontroller (30) comprising: a first input pin (31) configured to receive a first signal (OUT1) from a sensor device (10), wherein the first signal (OUT1) is a first pulse signal at least under normal conditions; a second input pin (32) configured to receive a second signal (OUT2) from a sensor device (10), wherein the second signal (OUT2) is a second pulse signal at least under normal conditions, wherein: the first pulse signal (S1) comprises several transition edges defining multiple first pulses, the second pulse signal (S2) comprises several transition edges that define several second pulses, and the first several transition edges are synchronized with the second several transition edges, with the first signal (OUT1) and the second signal (OUT2) being received simultaneously and together indicating either the normal condition or an error condition; and at least one processor configured to evaluate the first signal (OUT1) and the second signal (OUT2) and to detect the normal condition or the fault condition based on the evaluated first signal (OUT1) and the evaluated second signal (OUT2), wherein the at least one processor is configured to detect transition edges of the first signal (OUT1) and the second signal (OUT2), wherein the at least one processor is configured to determine, for each detected transition edge of the first signal (OUT1) and the second signal (OUT2), whether two synchronous edges are detected, wherein the two synchronous edges comprise that a first transition edge of the first signal is synchronous with a second transition edge of the second signal, wherein, under a condition that the two synchronous edges are detected, the at least one processor is configured to determine that the normal condition is present, and wherein, under a condition that the two synchronous Flanks are not detected, provided that at least one processor is configured to detect that the error condition has occurred.
  11. Microcontroller (30) according to Claim 10 , wherein: while the normal condition is satisfied, the microcontroller (30) determines a speed at which a varying magnetic field varies from the first signal (OUT1), determines a direction in which the varying magnetic field varies from the second signal (OUT2), including the detection of a change in direction indicating a change in the direction of the varying magnetic field, and while the fault condition is satisfied, the microcontroller (30) determines the fault condition from the first signal, determines the speed at which the varying magnetic field varies from the second signal, and detects the change in direction indicating the change in the direction of the varying magnetic field from the second signal.
  12. Sensor device (10) comprising: at least one first sensor element (13) configured to generate at least one first sensor signal (Sx, Sx1) based on the detection of a varying magnetic field; at least one second sensor element (14) configured to generate at least one second sensor signal (Sy, Sx2) based on the detection of the varying magnetic field, wherein the varying magnetic field is caused by a rotational movement of an object, such that the first sensor signal (Sx, Sx1) and the second sensor signal (Sy, Sx2) are sinusoidal signals and wherein the at least one first sensor signal (Sx, Sx1) is phase-shifted from the at least one second sensor signal (Sy, Sx2); A signal processing circuit (15, 16) configured to generate a first pulse signal (S1) based on the at least one first sensor signal (Sx, Sx1), to determine a phase shift direction of a phase shift between the at least one first sensor signal (Sx, Sx1) and the at least one second sensor signal (Sy, Sx2), and to generate a second pulse signal (S2) based on the determined phase shift direction, wherein: the first pulse signal (S1) comprises several transition edges defining several first pulses, the second pulse signal (S2) comprises several transition edges defining several second pulses, and the first several transition edges are synchronized with the second several transition edges, wherein the signal processing circuit (15, 16) is further configured to detect a phase shift inversion, in which the direction of the phase shift changes, and to establish a state of the second pulse signal (S2) in response to the detection of the to switch phase shift inversion; a fault detector (18) configured to detect at least one fault and to generate a fault signal indicating the at least one fault in response to the detection of the at least one fault; and an output generator (17) configured to receive the first pulse signal (S1) and the second pulse signal (S2), to receive the fault signal based on a first condition that the fault detector (18) detects the at least one fault, and simultaneously to output a first output signal (OUT1) and a second output signal (OUT2), wherein, based on a second condition that the fault detector (18) does not detect the at least one fault, the output generator (17) is configured to output the first pulse signal (S1) as the first output signal (OUT1) and to output the second pulse signal (S2) as the second output signal (OUT2), and wherein, in response to the first condition being met, the output generator (17) is configured to maintain the first output signal (OUT1) in a steady state and the second pulse to output signal (S2) as the second output signal.
  13. Sensor device (10) according Claim 12 , wherein: - the signal processing circuit (15, 16) is configured to determine whether a direction in which the varying magnetic field varies, corresponding to a direction of rotation of the target object, lies in a first direction or a second direction, to generate the first pulse signal (S1) and the second pulse signal (S2) so that they are in phase with each other, in response to the determination that the direction lies in the first direction, and to generate the first pulse signal (S1) and the second pulse signal (S2) so that they are phase-shifted by 180° with each other, in response to the determination that the direction lies in the second direction, and/or - the at least one first sensor element (13) is configured to generate the at least one first sensor signal (Sx, Sx1) based on the detection of a first magnetic field component of the varying magnetic field, and the at least one second sensor element (14) is configured to generate the at least one second sensor signal (Sy, Sx2) based on the detection of a second magnetic field component of the varying magnetic field, wherein the first magnetic field component and the second magnetic field component have different directions, and/or - the at least one first sensor element (13) is configured to generate the at least one first sensor signal (Sx, Sx1) based on the detection of a first magnetic field component of the varying magnetic field, and the at least one second sensor element (14) is configured to generate the at least one second sensor signal (Sy, Sx2) based on the detection of the first magnetic field component of the varying magnetic field along the same detection axis as the at least one first sensor element (13), and/or - while a normal condition is met, the first output signal (OUT1) indicates a speed at which a varying magnetic field varies, corresponding to a rotational speed of the target object, and the second output signal (OUT2) indicates a direction in which the varying magnetic field varies, corresponding to a direction of rotation of the target object, including an indication of a change in direction, which indicates a change in the direction of the varying magnetic field, and while a fault condition is met The first output signal (OUT1) specifies the error condition, and the second output signal (OUT2) specifies the speed at which the varying magnetic field varies and the change in direction of the varying magnetic field.
  14. Sensor device (10) comprising: at least one first sensor element (13) configured to generate at least one first sensor signal (Sx) based on the detection of a magnetic field component of a varying magnetic field; a signal processing circuit (15, 46) configured to generate a first pulse signal (S1) based on the at least one first sensor signal (Sx) and to generate a second pulse signal (S2) in duplicate to the first pulse signal (S1), wherein: the first pulse signal (S1) comprises several transition edges defining multiple first pulses, the second pulse signal (S2) comprises several transition edges defining multiple second pulses, and the first transition edges are synchronized with the second transition edges; a fault detector (18) configured to detect at least one first fault and to generate a first fault signal indicating the at least one first fault in response to the detection of the at least one first fault; and an output generator (17) configured to receive the first pulse signal (S1) and the second pulse signal (S2), to receive the first fault signal based on a first condition that the fault detector detects the at least one first fault, and simultaneously output a first output signal (OUT1) and a second output signal (OUT2), whereby, based on a second condition that the fault detector does not detect the at least one first fault, the output generator (17) is configured to output the first pulse signal (S1) as the first output signal (OUT1) and to output the second pulse signal (S2) as the second output signal (OUT2), and whereby, in response to the first condition being met, the output generator (17) is configured to keep the first output signal (OUT1) in a steady state and to output the second pulse signal (S2) as the second output signal (OUT2).
  15. Sensor device according to Claim 14 , wherein: the fault detector (18) is configured to detect at least one second fault and to generate a second fault signal indicating the at least one second fault in response to the detection of the at least one second fault, the output generator (17) is configured to receive the second fault signal on the basis of a third condition that the fault detector detects the at least one second fault, While a fourth condition, that the fault detector does not detect either the first fault or the second fault, is met, the output generator is configured to output the first pulse signal (S1) as the first output signal (OUT1) and to output the second pulse signal (S2) as the second output signal (OUT2), and in response to the third condition being met, the output generator (17) is configured to keep the second output signal (OUT2) in a steady state and to output the first pulse signal (S1) as the first output signal (OUT1).
  16. Sensor device (10) according Claim 15 , wherein: - the at least one first error and the at least one second error are different error types, and/or - the output generator (17) stores a mapping that maps the at least one first error to the first output signal (OUT1) and maps the at least one second error to the second output signal (OUT2), and/or - in response to the first condition being met, the output generator (17) is configured to ignore the first pulse signal (S1), and in response to the third condition being met, the output generator (17) is configured to ignore the second pulse signal (S2), and/or - while the fourth condition is met, the first output signal (OUT1) includes several transition edges defining several first pulses, the second output signal (OUT2) includes several transition edges defining several second pulses, and the first several transition edges are synchronized with the second several transition edges.
  17. Sensor device (10) according Claim 15 or 16 , wherein: the first pulse signal (S1) comprises several transition edges defining several first pulses, the second pulse signal (S2) comprises several transition edges defining several second pulses, and the first several transition edges are synchronized with the second several transition edges.
  18. Sensor device (10) according to one of the Claims 15 until 17 , where: the first pulse signal (S1) and the second pulse signal (S2) indicate a speed at which the varying magnetic field varies.
  19. Sensor device (10) comprising: at least one first sensor element (13) configured to generate at least one first sensor signal (Sx) based on the detection of a magnetic field component of a varying magnetic field; a signal processing circuit (15, 46) configured to generate a first pulse signal (S1) based on the at least one first sensor signal (Sx) and to generate a second pulse signal (S2) in duplicate to the first pulse signal (S1), wherein: the first pulse signal (S1) comprises several transition edges defining several first pulses, the second pulse signal (S2) comprises several transition edges defining several second pulses, and the first transition edges are synchronized with the second transition edges; a fault detector (18) configured to detect at least one first fault and to generate a first fault signal indicating the at least one first fault in response to the detection of the at least one first fault, to detect at least one second fault and to generate a second fault signal indicating the at least one second fault in response to the detection of the at least one second fault, to detect at least one third fault and to generate a third fault signal indicating the at least one third fault in response to the detection of the at least one third fault, and to detect at least one fourth fault and to generate a fourth fault signal indicating the at least one first fourth fault in response to the detection of the at least one fourth fault; and an output generator (17) configured to receive the first pulse signal (S1) and the second pulse signal (S2), to receive the first error signal based on a first condition that the error detector detects the at least one first error, to receive the second error signal based on a second condition that the error detector detects the at least one second error, to receive the third error signal based on a third condition that the error detector detects the at least one third error, to receive the fourth error signal based on a fourth condition that the error detector detects the at least one fourth error, and simultaneously output a first output signal and a second output signal, wherein, based on a fifth condition that the error detector does not detect the at least one first error, the at least one second error, the at least one third error, or the at least one fourth error, the output generator (17) is configured to output the first pulse signal (S1) as a first output signal (OUT1) and the second pulse signal (S2) as a second output signal (OUT2), and wherein, in response to the first condition being met, the output generator (17) is configured to maintain the first output signal (OUT1) in a high steady state and output the second pulse signal (S2) as the second output signal, wherein, in response to the second condition being met, the output generator (17) is configured to maintain the first output signal (OUT1) in a low steady state and output the second pulse signal (S2) as the second output signal, wherein, in response to the third condition being met, the output generator (17) is configured to maintain the second output signal (OUT2) in a high steady state and output the first pulse signal (S1) as the first output signal (OUT1), and wherein, in response to the fourth condition being met, the output generator (17) is configured to maintain the second output signal (OUT2) in a low steady state and output the first pulse signal (S1) as the first output signal to spend.

Description

BACKGROUND Magnetic speed sensors are used for speed measurement in many applications across numerous industries, including the automotive industry, for measuring wheel speed, engine speed, transmission speed, and similar parameters. In speed measurement, a magnetic sensor can generate a sinusoidal signal in response to the rotation of a target object such as a wheel, camshaft, crankshaft, or similar component. This sinusoidal signal can be converted into pulses, which can then be used for motion detection or speed output. One purpose of an engine speed sensor, or crankshaft sensor, is to determine the speed at which the crankshaft rotates. That is, it measures the speed and direction of crankshaft rotation. These speed sensors are electronic control devices used in internal combustion engines in motor vehicles. This component sends crucial information to an electronic control unit (ECU) (such as an engine control module (ECM)). The information from a crankshaft speed sensor is used to control engine management, fuel injection, and ignition timing systems. Information from a speed sensor can generate a speed signal, representing the rotational speed of a target object, and a direction signal, representing the direction of rotation of the target object. Consequently, a speed sensor can include a first output pin for outputting a speed signal and a second output pin for outputting a direction signal. Furthermore, the speed sensor can be configured to provide diagnostic information to a microcontroller such as the ECU. Conventional speed sensors use a third output pin to output this diagnostic information. However, implementing a third pin adds cost to the device and the overall system. A so-called "life sign" can, for example, be generated and output via a third output pin. Implementing such a life sign is difficult because it requires defining what happens when a life sign occurs alongside a signal change. A specific time must also be defined. This also means that the fault response time is defined at the system level, making the implementation less flexible in safety-critical applications. The microcontroller must also measure all these time points. The US 5 497 082 A Disclosed is a sensor device comprising a Hall sensor and a magnetoresistive sensor. The Hall sensor detects a magnetic field component perpendicular to a substrate, and the magnetoresistive sensor detects a magnetic field component in the plane of the substrate. Signals from both sensors are output as pulse signals. Another device with two sensors is disclosed in the US 2008 / 0 180 089 A1 known. The DE 10 2015 110 225 A1 Disclosing a sensor device with a fault detector that can detect a fault based on sensor signals and outputs a corresponding fault signal. Further fault detectors are shown in the US 2020 / 0 025 837 A1 , the DE 10 2018 120 710 A1 and the DE 10 2017 219 448 A1 known. Therefore, an improved speed sensor capable of providing speed, direction, and diagnostic information, or speed and two diagnostic information, with maximum utilization of two output pins, may be desirable. SUMMARY A sensor device as defined in claim 1, 12, 14 or 19, a sensor system as defined in claim 7, and a microcontroller as defined in claim 8 or 10 are provided. The dependent claims define further embodiments. Embodiments are directed towards a speed sensor that is capable of providing speed, direction and diagnostic information with a maximum use of two output pins. One or more embodiments are directed towards a sensor device comprising at least one first sensor element with a first detection direction configured to generate at least one first sensor signal based on the detection of a first magnetic field component of a varying magnetic field oriented in the first detection direction; at least one second sensor element with a second detection direction configured to generate at least one second sensor signal based on the detection of a second magnetic field component of the varying magnetic field oriented in the second detection direction; and a signal processing circuit configured to The system comprises generating a first pulse signal based on at least one first sensor signal and generating a second pulse signal based on at least one second sensor signal; a fault detector configured to detect at least one fault and generating a fault signal indicating the at least one fault in response to the detection of the at least one fault; and an output generator configured to receive the first pulse signal and the second pulse signal, which, based on a first condition that the fault detector detects the at least one fault, receives the fault signal and simultaneously outputs a first output signal and a second output signal. Based on a second condition that the fault detector does not detect the at least one fault, the output generator is configured to output the first pulse signal as the first output signal and the second pulse signal as the second output signal.