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DE-102024133220-A1 - Circuit arrangement, electrical power converter and electric drive for propelling a vehicle

DE102024133220A1DE 102024133220 A1DE102024133220 A1DE 102024133220A1DE-102024133220-A1

Abstract

Circuit arrangement (1), comprising: - N electrical energy sources (2a-c), each configured to provide electrical energy with a predetermined value of a physical quantity at a terminal (4a-c) of the energy source (2a-c) in a normal operating state; - a detection device (5) having an analog input (6) and an output (7) and configured to provide at the output (7) a detection signal (8) which depends on a voltage applied at the analog input (6); - a load resistor (11); - (N-1) resistors of the first kind (12a, b), wherein the first resistor of the first kind (12a) is connected to the load resistor (11) and the (N-1)th resistor of the first kind (12b) is connected to the analog input (6) of the detection device (5); - N resistors of the second kind (13a-c), wherein the first resistor of the second kind (13a) connects the terminal of the first power source (2a) to a first circuit node (14a) between the load resistor (11) and the first resistor of the first kind (12a), wherein the Nth resistor of the second kind (13c) has an Nth circuit node (14c) with the (N-1)th resistor of the first kind (12b) and is connected to the analog input (6); and - an evaluation device (17) which is designed to determine a fault operating state of at least one of the energy sources (2a-c).

Inventors

  • Guido Schuffert

Assignees

  • VALEO EAUTOMOTIVE GERMANY GMBH

Dates

Publication Date
20260513
Application Date
20241113

Claims (15)

  1. Circuit arrangement (1) comprising: - first to Nth electrical energy sources (2a-c), each connected to a reference potential (3) and configured to supply, in a normal operating state, at a terminal (4a-c) of the energy source (2a-c) with a predetermined value of a physical quantity, namely a voltage or a current, relative to the reference potential (3), wherein N ≥ 2; - a detection device (5) having an analog input (6) and an output (7) and configured to provide at the output (7) a detection signal (8) dependent on a voltage applied to the analog input (6); - a load resistor (11) connected to the reference potential (3); - first to (N-1)th resistors of the first type (12a, b) connected in series in order of their indexing, wherein the first resistor of the first type (12a) is connected to the load resistor (11) and the (N-1)th resistor of the first type (12b) is connected to the analog input (6) of the detection device (5); - first to Nth resistors of the second kind (13a-c), wherein the first resistor of the second kind (13a) connects the terminal of the first power source (2a) to a first circuit node (14a) between the load resistor (11) and the first resistor of the first kind (12a), wherein the Nth resistor of the second kind (13c) has an Nth circuit node (14c) with the (N-1)th resistor of the first kind (12b) and is connected to the analog input (6), wherein, if N ≥ 3, for all 2 ≤ i ≤ N-1, the i-th resistor of the second kind (13b) connects the terminal of the i-th power source (2b) to an i-th circuit node (14b) between the (i-1)th resistor of the first kind (12a) and the i-th resistor of the first kind (12b); and - an evaluation device (17) which is configured to detect an error depending on the resistance values of the resistors of the first and second type (12a, b, 13a-c), the load resistance, the detection signal (8) and the respective specified value to determine the fault operating state of at least one of the energy sources (2a-c) in which a current value of the physical quantity deviates from the specified value and to output an evaluation signal (18) describing the presence of the fault operating state.
  2. Circuit arrangement according to Claim 1 , further comprising - a series resistor (15) connected between the analog input (6) and the Nth circuit node (14c), and - a constant current source (16) connected to an (N+1)th circuit node (14d) with the series resistor (15) and the analog input (6) and configured to generate a bias voltage at the analog input (6), wherein the evaluation device (17) is configured to determine the presence of the fault operating state depending on the bias voltage.
  3. Circuit arrangement according to Claim 1 or 2 , where the first resistance values of the resistors of the first kind (12a, 12b) are the same.
  4. Circuit arrangement according to one of the preceding claims, wherein the second resistance values of the resistors of the second type (13a-c) are different.
  5. Circuit arrangement according to Claim 4 , wherein the specified value of one of the energy sources (2a-c) is greater than the specified value of another of the energy sources (2a-c) and the second resistance value of the resistor of the second kind (13a-c) which is connected downstream of one of the energy sources is greater than the second resistance value of the resistor of the second kind (13a-c) which is connected downstream of the other of the energy sources (2a-c).
  6. Circuit arrangement according to Claim 4 or 5 , wherein the specified values of at least two of the energy sources (12a-c) are the same and the second resistance values of the resistors of the second type (13a-c), which are connected downstream of the at least two of the energy sources (12a-c), are different.
  7. Circuit arrangement according to one of the preceding claims, wherein the output (7) of the detection device is a digital output and/or the detection device (5) comprises an analog-to-digital converter (9).
  8. Circuit arrangement according to one of the preceding claims, further comprising an isolation device (20) which separates the circuit arrangement (1) into a first section (21) which includes at least the energy sources (2a-c), the detection device (5) and the resistors of the first and second type (12a, b, 13a-c), and the load resistor (11), and into a second section (22) which is electrically isolated from the first section (21) and which includes at least the evaluation device (17), and is configured to transmit the detection signal (8) from the first section (21) to the second section (22).
  9. Circuit arrangement according to one of the preceding claims, wherein the energy sources (2a-c) are designed as regulated constant voltage sources and the electrical quantity is the voltage.
  10. An electrical power converter (50) for a vehicle (200), comprising: - an input (51) for an input voltage; - an output (52) for an output voltage; - a power section (54) comprising several semiconductor switching elements (53a-f); - a control unit (55) configured to drive the semiconductor switching elements (53a-f) to convert the input voltage into the output voltage; - a driver unit (57) for each semiconductor switching element (53a-f), which is connected upstream of a control terminal (59) of the semiconductor switching element (53a-f), can be supplied by at least one supply voltage, and is configured to drive a control signal (61) provided by the control unit (55) to drive the semiconductor switching element (53a-f); and - at least one circuit arrangement (1) according to any one of the preceding claims; wherein at least some of the energy sources (2a-c) are configured to provide at least one supply voltage.
  11. Power converter according to Claim 10 , wherein the power converter (50) is configured as an inverter for converting a DC voltage as input voltage into an AC voltage with M phases as output voltage, wherein for each phase two of the semiconductor switching elements (53a-f) form a half-bridge (56a-c), wherein 2·M circuit arrangements (1) are provided, each of which is assigned to one of the semiconductor switching elements (53a-f) and each is configured to provide the supply voltages of the driver device (57) for one of the semiconductor switching elements (53a-f).
  12. Power converter according to Claim 10 or 11 , wherein a housing (70) is provided for each of the driver devices (57), which encloses the driver device (57) and the detection device (5) and provides a connection (70a, b) and a connection (70h) for each supply voltage to the Connecting the analog input (6) of the detection device (5).
  13. Power converter according to Claim 12 , if dependent on Claim 8 , the housing (70) further encloses the isolation device (20) of the circuit arrangement (1) and/or an isolation device (69) associated with the driver device (57) for transmitting the control signal (61) or signals (68, 67) generated therefrom.
  14. Power converter according to one of the preceding claims, wherein the control device (55) is configured to deactivate the power converter (50) depending on the evaluation signal (18) and/or to output an error signal depending on the evaluation signal (18).
  15. Electric drive (100) for propelling a vehicle (200), comprising - a power converter (50) according to one of the Claims 11 until 14 and - an M-phase electrical machine (101) that can be supplied by alternating current.

Description

The present invention relates to a circuit arrangement. The invention also relates to an electrical power converter and an electric drive for propelling a vehicle. In circuit arrangements with multiple energy sources, there is often a need to measure an electrical quantity, such as voltage or current, of the electrical energy supplied by the energy sources. This is particularly true for electrical power converters when measuring this physical quantity serves to monitor energy sources that supply driver devices. Such monitoring is especially necessary for compliance with functional safety standards in electrically powered vehicles. Data acquisition is often performed using a sensor with an analog input. If there are more energy sources or physical quantities to be monitored than the number of analog inputs, simple data acquisition becomes difficult. Possible solutions, such as using a controlled switch to acquire the quantities sequentially over time, or providing additional sensor devices, have the disadvantage of being component-intensive and costly. The invention is therefore based on the objective of providing an improved possibility for detecting physical quantities of the electrical energy supplied by several electrical energy sources in a circuit arrangement of a detection device with an analog input. This problem is solved according to the invention by a circuit arrangement comprising: first to Nth electrical energy sources, each connected to a reference potential and configured to provide, in a normal operating state, electrical energy with a predetermined value of a physical quantity, namely a voltage or a current, at a terminal of the energy source relative to the reference potential, wherein N ≥ 2; a detection device having an analog input and an output and configured to provide at the output a detection signal dependent on a voltage applied to the analog input; a load resistor connected to the reference potential; first to (N-1)th resistors of the first kind connected in series in the order of their indexing, wherein the first resistor of the first kind is connected to the load resistor and the (N-1)th resistor of the first kind is connected to the analog input of the detection device; first to Nth resistors of the second type, wherein the first resistor of the second type connects the terminal of the first energy source to a first circuit node between the load resistor and the first resistor of the first type, wherein the Nth resistor of the second type has an Nth circuit node with the (N-1)th resistor of the first type and is connected to the analog input, wherein, if N ≥ 3, for all 2 ≤ i ≤ N-1, the ith resistor of the second type connects the terminal of the ith energy source to an ith circuit node between the (i-1)th resistor of the first type and the ith resistor of the first type; and an evaluation device configured to determine, as a function of the resistance values of the resistors of the first and second type, the load resistor, the detection signal and the respective specified value, a fault operating state of at least one of the energy sources in which a current value of the physical quantity deviates from the specified value and to output an evaluation signal describing the presence of the fault operating state. The circuit arrangement according to the invention comprises first to N electrical energy sources. Each energy source is connected to a reference potential. Each energy source is configured to provide, in a normal operating state, electrical energy with a predetermined value of a physical quantity at one terminal of the energy source relative to the reference potential. The physical quantity is a voltage or a current. N is greater than or equal to two. The circuit arrangement according to the invention further comprises a detection device. The detection device has an analog input. The detection device is configured to provide a detection signal at its output. The detection signal depends on a voltage applied to the analog input. The circuit arrangement according to the invention further comprises a load resistor. The load resistor is connected to the reference potential. The circuit arrangement according to the invention further comprises first to (N-1)th resistors of the first type. The resistors of the first type are connected in series in the order of their indexing. The first resistor of the first type is connected to the load resistor. The (N-1)th resistor of the first type is connected to the analog input of the detection device. The circuit arrangement according to the invention further comprises first to Nth resistors of the second The first resistor of the second kind connects the terminal of the first power source to a first circuit node. The first circuit node lies between the load resistor and the first resistor of the first kind. The Nth resistor of the second kind has an Nth circuit node with the (N-1)th resistor of the first kind. The Nth resistor is connected