CN-122000831-A - Short-circuit protection circuit, controller and vehicle

CN122000831ACN 122000831 ACN122000831 ACN 122000831ACN-122000831-A

Abstract

Embodiments of the present disclosure relate to a short-circuit protection circuit, a controller, and a vehicle. The short-circuit protection circuit comprises a current detection circuit, a comparison circuit, a switching circuit and a latch circuit. The current detection circuit is configured to generate a target voltage from a target current flowing from the first node to the second node and to supply the target voltage to the third node. In the case where the target current is greater than the short-circuit current threshold, the target voltage is higher than the reference voltage. The comparison circuit is configured to output the first level via the fourth node in a case where the voltage of the third node is higher than the reference voltage. The switching circuit is configured to disconnect the connection between the first node and the second node if the fourth node is at the first level. The latch circuit is configured to maintain a voltage of the third node higher than a reference voltage in a case where the fourth node is at the first level. The short-circuit protection circuit can be used for breaking the loop when the loop where the short-circuit protection circuit is located sends a short circuit, so that the safety of other components in the loop is protected.

Inventors

QIU XIAOFEI
YUAN BO
Huang Diequn
LIN BINGQING
SHEN LUE

Assignees

罗伯特·博世有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (13)

1. A short-circuit protection circuit (200), comprising: A current detection circuit (210) configured to generate a target voltage (Vtar) from a target current flowing from a first node (N1) to a second node (N2) and to provide the target voltage (Vtar) to a third node (N3), wherein the target voltage (Vtar) is higher than a reference voltage (Vref) if the target current is greater than a short circuit current threshold; -a comparison circuit (220) configured to output a first level via a fourth node (N4) in case the voltage of the third node (N3) is higher than the reference voltage (Vref); A switching circuit (230) configured to disconnect the connection between the first node (N1) and the second node (N2) in case the fourth node (N4) is at the first level, and A latch circuit (240) configured to maintain a voltage of the third node (N3) higher than the reference voltage (Vref) with the fourth node (N4) at the first level.
2. The short-circuit protection circuit (200) according to claim 1, wherein the target voltage (Vtar) is lower than the reference voltage (Vref) if the target current is lower than the short-circuit current threshold, the comparison circuit (220) is further configured to output a second level via the fourth node (N4) if the voltage of the third node (N3) is lower than the reference voltage (Vref), the switching circuit (230) is further configured to connect the first node (N1) and the second node (N2) if the fourth node (N4) is at the second level.
3. The short-circuit protection circuit (200) of claim 2, wherein the latch circuit (240) comprises: A pull-down circuit (241) configured to pull down a voltage of a fifth node (N5) to the first level if the fourth node (N4) is at the second level; A pull-up circuit (242) configured to pull up a voltage of the fifth node (N5) to the second level with the fourth node (N4) at the first level; -a first control circuit (243) configured to pull down the voltage of the sixth node (N6) to the first level if the voltage of the fifth node (N5) is at the second level; -a second control circuit (244) configured to pull up the voltage of the third node (N3) to the second level if the voltage of the sixth node (N6) is at the first level, and to stop operation if other, wherein the second level is higher than the reference voltage (Vref).
4. The short-circuit protection circuit (200) of claim 3, wherein the pull-down circuit (241) comprises a first resistor (R1) and a first transistor (M1), Wherein a first end of the first resistor (R1) is coupled to the fourth node (N4), and a second end of the first resistor (R1) is coupled to a second voltage end (V2); The control electrode of the first transistor (M1) is coupled to the first end of the first resistor (R1), the first electrode of the first transistor (M1) is coupled to the second voltage end (V2), and the second electrode of the first transistor (M1) is coupled to the fifth node (N5).
5. The short-circuit protection circuit (200) of claim 3, wherein the pull-up circuit (242) comprises a second resistor (R2), Wherein a first end of the second resistor (R2) is coupled to a power supply voltage end (Vcc), and a second end of the second resistor (R2) is coupled to the fifth node (N5).
6. The short-circuit protection circuit (200) according to claim 3, wherein the first control circuit (243) comprises a third resistor (R3) and a second transistor (M2), Wherein a first end of the third resistor (R3) is coupled to the fifth node (N5), and a second end of the third resistor (R3) is coupled to a second voltage end (V2); The control electrode of the second transistor (M2) is coupled to the fifth node (N5), the first electrode of the second transistor (M2) is coupled to the second voltage terminal (V2), and the second electrode of the second transistor (M2) is coupled to the sixth node (N6).
7. The short-circuit protection circuit (200) according to claim 3, wherein the second control circuit (244) comprises a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7) and a third transistor (M3), Wherein a first end of the fourth resistor (R4) is coupled to a power supply voltage end (Vcc), and a second end of the fourth resistor (R4) is coupled to the sixth node (N6); -a first end of the fifth resistor (R5) is coupled to the sixth node (N6), and a second end of the fifth resistor (R5) is coupled to the control electrode of the third transistor (M3); -a first end of the sixth resistor (R6) is coupled to the supply voltage terminal (Vcc), and a second end of the sixth resistor (R6) is coupled to the first pole of the third transistor (M3); A first end of the seventh resistor (R7) is coupled to the second pole of the third transistor (M3) and the third node (N3), and a second end of the seventh resistor (R7) is coupled to the second voltage end (V2).
8. The short circuit protection circuit (200) of claim 3, wherein the latch circuit (240) further comprises a power supply circuit (245) configured to provide a supply voltage to the pull-up circuit (242) and the second control circuit (244).
9. The short-circuit protection circuit (200) according to claim 1 or 2, wherein the switching circuit (230) comprises a fourth transistor (M4) and a fifth transistor (M5), Wherein a control electrode of the fourth transistor (M4) is coupled to the fourth node (N4), a first electrode of the fourth transistor (M4) is coupled to a first electrode of the fifth transistor (M5), and a second electrode of the fourth transistor (M4) is coupled to an input terminal of the current detection circuit (210); the control electrode of the fifth transistor (M5) is coupled to the fourth node (N4), and the second electrode of the fifth transistor (M5) is coupled to the first node (N1).
10. The short-circuit protection circuit (200) according to claim 9, wherein the current detection circuit (210) comprises an eighth resistor (R8) and a first operational amplifier (AMP 1), Wherein a first end of the eighth resistor (R8) is coupled to the second pole of the fourth transistor (M4), a second end of the eighth resistor (R8) is coupled to the second node (N2); a first input of the first operational amplifier (AMP 1) is coupled to the first end of the eighth resistor (R8), a second input of the first operational amplifier (AMP 1) is coupled to the second end of the eighth resistor (R8), and an output of the first operational amplifier (AMP 1) is coupled to the third node (N3).
11. The short-circuit protection circuit (200) according to claim 1 or 2, wherein the comparison circuit (220) comprises a second operational amplifier (AMP 2), Wherein a first input of the second operational amplifier (AMP 2) is provided with the reference voltage (Vref), a second input of the second operational amplifier (AMP 2) is coupled to the third node (N3), and an output of the second operational amplifier (AMP 2) is coupled to the fourth node (N4).
12. A controller comprising a short-circuit protection circuit (200) according to any one of claims 1 to 11, wherein the first node (N1) is coupled to a ground of an interface circuit in the controller and the second node (N2) is coupled to an external ground.
13. A vehicle (10) comprising the controller of claim 12.

Description

Short-circuit protection circuit, controller and vehicle Technical Field Embodiments of the present disclosure relate generally to the field of circuit technology, and in particular, to a short-circuit protection circuit, a controller, and a vehicle. Background Short circuit refers to a circuit or a portion of a circuit being shorted. The current supplied by the power supply at a short circuit will be much greater than that normally supplied, and may burn out the power supply or device. Disclosure of Invention Embodiments of the present disclosure provide a short-circuit protection circuit, a controller, and a vehicle. According to a first aspect of the present disclosure, a short circuit protection circuit is provided. The short-circuit protection circuit comprises a current detection circuit, a comparison circuit, a switching circuit and a latch circuit. The current detection circuit is configured to generate a target voltage from a target current flowing from the first node to the second node and to supply the target voltage to the third node. Wherein the target voltage is higher than the reference voltage in the case where the target current is greater than the short circuit current threshold. The comparison circuit is configured to output the first level via the fourth node in a case where the voltage of the third node is higher than the reference voltage. The switching circuit is configured to disconnect the connection between the first node and the second node if the fourth node is at the first level. The latch circuit is configured to maintain a voltage of the third node higher than a reference voltage in a case where the fourth node is at the first level. According to a second aspect of the present disclosure, a controller is provided. The controller comprises a short-circuit protection circuit according to the first aspect of the present disclosure. The first node is coupled to the ground of the interface circuit in the controller, and the second node is coupled to the external ground. According to a third aspect of the present disclosure, a vehicle is provided. The vehicle comprises a controller according to the second aspect of the present disclosure. Drawings The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure. FIG. 1 illustrates a schematic diagram of an example environment in which a short-circuit protection circuit may be implemented, in accordance with an embodiment of the present disclosure; FIG. 2 illustrates a schematic block diagram of a short-circuit protection circuit according to an embodiment of the present disclosure; FIG. 3 illustrates a further schematic block diagram of a short-circuit protection circuit in accordance with an embodiment of the present disclosure; FIG. 4 illustrates a schematic circuit diagram of a short-circuit protection circuit according to an embodiment of the present disclosure; fig. 5 illustrates another schematic circuit diagram of a short-circuit protection circuit according to an embodiment of the present disclosure. Like or corresponding reference characters indicate like or corresponding parts throughout the several views. It is noted that the elements in the drawings are schematic and are not drawn to scale. Detailed Description Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure. In describing embodiments of the present disclosure, the term "comprising" and its like should be understood to be open-ended, i.e., including, but not limited to. The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first," "second," and the like, may refer to different or the same object. Other explicit and implicit definitions are also possible below. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the presently disclosed subject matter belongs. It will be further understood that terms, such as those defined in commonly used dicti