Brake overload detection and protection circuit, chip and electronic equipment

Abstract

The utility model provides a brake overload detection and protection circuit, a chip and an electronic device, belonging to the electronic circuit technology field, the brake overload detection and protection circuit comprises a control module, a photoelectric coupler and a comparison module, the control module is connected to the photoelectric coupler and is used for controlling the on-off of the photoelectric coupler based on the access of a brake resistor; the first input end of the comparison module is connected to the first output end of the photoelectric coupler, and the second input end of the comparison module is used for receiving a reference signal so as to output a brake overload indication signal representing whether a brake overload fault exists or not based on the reference signal. According to the scheme, different comparison signals are input to the comparison module when the brake resistor is connected or not connected, so that the comparison module can output corresponding brake overload indication signals according to the connection condition of the brake resistor, and the brake overload fault is indicated when the brake resistor is not connected.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a braking overload detection and protection circuit, chip and electronic device. Background Technology

[0002] Braking overload refers to the inertial load and inertial energy generated by a servo motor during high-speed operation. When the motor stops, this energy continues to be output to the system, causing overload during braking. This can lead to system oscillation or instability, and in severe cases, damage to the motor or driver. A braking resistor is a device used to convert the regenerative electrical energy generated by the motor during rapid stopping into heat energy. It absorbs this energy, making the motor stop more smoothly.

[0003] The existing solution only designs the circuit for how to connect the braking resistor for discharge under braking conditions, and does not have a design for detecting whether the braking resistor is connected to the driver.

[0004] Therefore, there is an urgent need for a braking overload detection and protection circuit to detect whether a braking resistor is connected in the driver. Utility Model Content

[0005] This invention provides a braking overload detection and protection circuit, chip, and electronic device to solve the defect in the prior art that it is impossible to detect whether a braking resistor is connected in the driver.

[0006] This utility model provides a brake overload detection and protection circuit, comprising: a control module 1, an optocoupler 2, and a comparison module 3, wherein:

[0007] The control module 1 is connected to the optocoupler 2 and is used to control the on / off state of the optocoupler 2 based on the connection of the braking resistor;

[0008] The first input terminal of the comparison module 3 is connected to the first output terminal of the optocoupler 2, and the second input terminal of the comparison module 3 is used to receive a reference signal to output a brake overload indication signal that characterizes whether a brake overload fault exists based on the reference signal.

[0009] According to the braking overload detection and protection circuit provided by this utility model, the control module 1 includes:

[0010] The first control unit 110 is connected to the first input terminal of the optocoupler 2 and is used to output a first control signal to the first input terminal of the optocoupler 2.

[0011] The second control unit 120 is connected to the second input terminal of the optocoupler 2 and is used to output a second control signal to the second input terminal of the optocoupler 2.

[0012] According to the braking overload detection and protection circuit provided by this utility model, the first control unit 110 includes a first resistor R1, a second resistor R2 and a first transistor Q1;

[0013] The first end of the first resistor R1 is connected to the braking terminal, and the second end of the first resistor R1 is connected to the base of the first transistor Q1;

[0014] The first end of the second resistor R2 is connected to the base of the first transistor Q1, and the second end of the second resistor R2 is grounded.

[0015] The collector of the first transistor Q1 is connected to the first input terminal of the optocoupler 2, and the emitter of the first transistor Q1 is grounded.

[0016] According to the braking overload detection and protection circuit provided by this utility model, the first control unit 110 further includes a first diode D1, a first capacitor C1 and a third resistor R3;

[0017] The positive terminal of the first diode D1 is connected to the base of the first transistor Q1, and the negative terminal of the first diode D1 is connected to the power supply voltage VDD.

[0018] The first terminal of the first capacitor C1 is connected to the power supply voltage VDD, and the second terminal of the first capacitor C1 is grounded.

[0019] The first end of the third resistor R3 is connected to the power supply voltage VDD, and the second end of the third resistor R3 is connected to the first input terminal of the optocoupler 2.

[0020] According to the braking overload detection and protection circuit provided by this utility model, the second control unit 120 includes a fourth resistor R4, a fifth resistor R5, and a second transistor Q2;

[0021] The first end of the fourth resistor R4 is connected to the DC power supply terminal DC+, and the second end of the fourth resistor R4 is connected to the base of the second transistor Q2.

[0022] The first end of the fifth resistor R5 is connected to the base of the second transistor Q2, and the second end of the fifth resistor R5 is grounded.

[0023] The collector of the second transistor Q2 is connected to the second input terminal of the optocoupler 2, and the emitter of the first transistor Q1 is grounded.

[0024] According to the present invention, a brake overload detection and protection circuit is provided, wherein the comparison module 3 includes a comparator 310, the inverting input terminal of the comparator 310 is connected to the first output terminal of the optocoupler 2, the non-inverting input terminal of the comparator 310 is connected to the reference voltage Vref, and the output terminal of the comparator 310 is connected to the brake overload alarm pin BRA.

[0025] According to the braking overload detection and protection circuit provided by this utility model, the comparison module 3 further includes a sixth resistor R6, a seventh resistor R7, and a second capacitor C2.

[0026] The first end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, and the second end of the sixth resistor R6 is grounded.

[0027] The second terminal of the seventh resistor R7 is connected to the inverting input terminal of the comparator 310;

[0028] The first end of the second capacitor C2 is connected to the inverting input of the comparator 310, and the second end of the second capacitor C2 is grounded.

[0029] According to the present invention, a braking overload detection and protection circuit is provided, wherein the braking overload detection and protection circuit further includes a driver chip, the Desat protection pin of the driver chip is connected to the first end of the sixth capacitor C6, and the second end of the sixth capacitor C6 is grounded.

[0030] This utility model also provides a chip on which an integrated circuit is integrated, the integrated circuit including the braking overload detection and protection circuit as described above.

[0031] This invention also provides an electronic device, including a braking overload detection and protection circuit as described above, or including a chip as described above.

[0032] This utility model provides a brake overload detection and protection circuit, chip, and electronic device, including: a control module, an optocoupler, and a comparison module. The control module is connected to the optocoupler and is used to control the on / off state of the optocoupler based on the connection of a braking resistor. The first input terminal of the comparison module is connected to the first output terminal of the optocoupler, and the second input terminal of the comparison module is used to receive a reference signal to output a brake overload indication signal indicating the presence of a brake overload fault based on the reference signal. This utility model controls the on / off state of the optocoupler based on the connection of the braking resistor; that is, different comparison signals are input to the comparison module when the braking resistor is connected and when it is not connected. This allows the comparison module to output a corresponding brake overload indication signal based on the connection status of the braking resistor, thus indicating the presence of a brake overload fault when the braking resistor is not connected. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the brake overload detection and protection circuit provided by this utility model;

[0035] Figure 2 This is a schematic diagram of the braking drive circuit provided by this utility model;

[0036] Figure 3 This is a schematic diagram of the working process of the brake overload detection and protection circuit provided by this utility model.

[0037] Figure label:

[0038] 1: Control module; 2: Optocoupler; 3: Comparator module; 110: First control unit; 120: Second control unit; 310: Comparator; R1: First resistor; R2: Second resistor; R3: Third resistor; R4: Fourth resistor; R5: Fifth resistor; R6: Sixth resistor; R7: Seventh resistor; R8: Eighth resistor; R9: Ninth resistor; C1: First capacitor; C2: Second capacitor; Q1: First transistor; Q2: Second transistor; D1: First diode; B: Braking terminal; VDD: Power supply voltage; DC+: DC power supply terminal; Vref: Reference voltage; BRA: Brake overload alarm pin; C3: Third capacitor; C4: Fourth capacitor; C5: Fifth capacitor; C6: Sixth capacitor; C7: Seventh capacitor; C8: Eighth capacitor; C9: Ninth capacitor; R11: Eleventh resistor; R12: Twelfth resistor; R13: Thirteenth resistor; R15: Fifteenth resistor; R16: Sixteenth resistor; R17: Seventeenth resistor; R18: Eighteenth resistor; D11: Eleventh diode; D12: Twelfth diode; D13: Thirteenth diode; D14: Fourteenth diode. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] It should be noted that in the description of the embodiments of this utility model, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The terms "upper," "lower," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0042] The following is combined with Figures 1-3 This invention describes the braking overload detection and protection circuit, chip, and electronic equipment provided in embodiments of the present invention.

[0043] Figure 1 This is a schematic diagram of the braking overload detection and protection circuit provided by this utility model, as shown below. Figure 1 As shown, the braking overload detection and protection circuit includes the following: a control module 1, an optocoupler 2, and a comparison module 3, wherein:

[0044] The control module 1 is connected to the optocoupler 2 and is used to control the on / off state of the optocoupler 2 based on the connection of the braking resistor;

[0045] The first input terminal of the comparison module 3 is connected to the first output terminal of the optocoupler 2, and the second input terminal of the comparison module 3 is used to receive a reference signal to output a brake overload indication signal that characterizes whether a brake overload fault exists based on the reference signal.

[0046] like Figure 1 As shown, after the braking resistor is connected, the control module 1 inputs a low level to pin 1 of the optocoupler 2. The internal photodiode of the optocoupler 2 is cut off. At this time, pins 3 and 4 at the rear end of the optocoupler 2 are not conducting, so the output level output to the comparison module 3 is less than the reference signal Vref. The comparison module 3 outputs a high-level braking overload indication signal, that is, the braking overload alarm pin BRA is high at this time, indicating no fault.

[0047] like Figure 1 As shown, when the servo driver is working, the three-phase power grid is connected to the power input. The uncontrolled three-phase rectifier bridge integrated in the IGBT module converts the 380V AC power input from the power grid into 513V DC power for the bus. When the braking resistor is not connected, the control module 1 inputs a high level to pin 1 of the optocoupler 2, and the photodiode inside the optocoupler 2 conducts. At this time, pins 3 and 4 at the rear end of the optocoupler 2 are connected, so the output potential output to the comparator module 3 is higher than the reference signal Vref. The comparator module 3 outputs a low-level braking overload indication signal, that is, the braking overload alarm pin BRA is low at this time, indicating a braking overload fault.

[0048] The braking overload detection and protection circuit provided by this utility model includes: a control module, an optocoupler, and a comparison module. The control module is connected to the optocoupler and is used to control the on / off state of the optocoupler based on the connection of a braking resistor. The first input terminal of the comparison module is connected to the first output terminal of the optocoupler, and the second input terminal of the comparison module is used to receive a reference signal to output a braking overload indication signal indicating the presence of a braking overload fault based on the reference signal. This utility model controls the on / off state of the optocoupler according to the connection of the braking resistor; that is, different comparison signals are input to the comparison module when the braking resistor is connected and when it is not connected. This allows the comparison module to output a corresponding braking overload indication signal based on the connection status of the braking resistor, thus indicating the presence of a braking overload fault when the braking resistor is not connected.

[0049] In an optional embodiment, the control module 1 includes:

[0050] The first control unit 110 is connected to the first input terminal of the optocoupler 2 and is used to output a first control signal to the first input terminal of the optocoupler 2.

[0051] The second control unit 120 is connected to the second input terminal of the optocoupler 2 and is used to output a second control signal to the second input terminal of the optocoupler 2.

[0052] In this embodiment, the first input terminal of the optocoupler 2 is the anode of the internal photodiode, and the second input terminal of the optocoupler 2 is the cathode of the internal photodiode. When the braking resistor is connected, the first control unit 110 controls the first control signal to be at a low level; when the braking resistor is not connected, the first control unit 110 controls the first control signal to be at a high level.

[0053] Furthermore, the first control unit 110 includes a first resistor R1, a second resistor R2, and a first transistor Q1;

[0054] The first end of the first resistor R1 is connected to the braking terminal, and the second end of the first resistor R1 is connected to the base of the first transistor Q1;

[0055] The first end of the second resistor R2 is connected to the base of the first transistor Q1, and the second end of the second resistor R2 is grounded.

[0056] The collector of the first transistor Q1 is connected to the first input terminal of the optocoupler 2, and the emitter of the first transistor Q1 is grounded.

[0057] like Figure 1 As shown, the braking terminal B is connected to pin 2, i.e., the base, of the first transistor Q1 via the first resistor R1. Thus, the level of the base of the first transistor Q1 is controlled by whether a braking resistor is connected between the braking terminal B and the DC power supply terminal DC+. In other words, the on / off state of the first transistor Q1 is controlled, thereby controlling the on / off state of the optocoupler 2.

[0058] In this embodiment, when a braking resistor is connected between the braking terminal B and the DC power supply terminal DC+, the first transistor Q1 is turned on, the input of pin 1 of the optocoupler 2 is low, the photodiode is turned off, pins 3 and 4 of the optocoupler are not turned on, and the comparator module 3 outputs a high level, indicating no fault. When the braking resistor is not connected, the potential of the braking terminal B is 0, the first transistor Q1 is not turned on, the input of pin 1 of the optocoupler 2 is high, the photodiode is turned on, pins 3 and 4 of the optocoupler are turned on, and the comparator module 3 outputs a low level, indicating a braking overload fault.

[0059] Furthermore, the first control unit 110 also includes a first diode D1, a first capacitor C1, and a third resistor R3;

[0060] The positive terminal of the first diode D1 is connected to the base of the first transistor Q1, and the negative terminal of the first diode D1 is connected to the power supply voltage VDD.

[0061] The first terminal of the first capacitor C1 is connected to the power supply voltage VDD, and the second terminal of the first capacitor C1 is grounded.

[0062] The first end of the third resistor R3 is connected to the power supply voltage VDD, and the second end of the third resistor R3 is connected to the first input terminal of the optocoupler 2.

[0063] In this embodiment, a current-limiting resistor, namely the third resistor R3, is connected in series between the power supply voltage VDD and the optocoupler 2 to prevent excessive current from damaging the LED of the optocoupler.

[0064] In this embodiment, a diode, namely the first diode D1, is connected in series between the power supply voltage VDD and the base of the first transistor Q1 to prevent the power supply voltage VDD from directly controlling the first transistor Q1 to conduct.

[0065] In an optional embodiment, the second control unit 120 includes a fourth resistor R4, a fifth resistor R5, and a second transistor Q2;

[0066] The first end of the fourth resistor R4 is connected to the DC power supply terminal DC+, and the second end of the fourth resistor R4 is connected to the base of the second transistor Q2.

[0067] The first end of the fifth resistor R5 is connected to the base of the second transistor Q2, and the second end of the fifth resistor R5 is grounded.

[0068] The collector of the second transistor Q2 is connected to the second input terminal of the optocoupler 2, and the emitter of the first transistor Q1 is grounded.

[0069] like Figure 2 As shown, when the braking resistor is connected, the braking terminal B and the DC+ terminals are at the same potential. When the braking terminal B and the DC+ terminals are at the same potential, the first transistor Q1 is turned on, the input of pin 1 of the optocoupler 2 is low, the internal photodiode of the optocoupler 2 is cut off, and the pins 3 and 4 of the optocoupler are not connected at this time. The back-end comparison module 3 outputs a high level, and the braking overload alarm pin is high, indicating no fault. When the braking resistor is not connected, the potential of the braking terminal B pin is 0. At this time, the first transistor Q1 is not turned on, the second transistor Q2 is turned on, the pin 1 of the optocoupler 2 is high, the photodiode of the optocoupler 2 is turned on, and the pins 3 and 4 of the back-end are connected. The comparison module 3 outputs a low level, and the braking overload alarm pin BRA is low, indicating a braking overload fault.

[0070] Based on any of the above embodiments, the comparison module 3 includes a comparator 310, the inverting input terminal of the comparator 310 is connected to the first output terminal of the optocoupler 2, the non-inverting input terminal of the comparator 310 is connected to the reference voltage Vref, and the output terminal of the comparator 310 is connected to the brake overload alarm pin BRA.

[0071] like Figure 1 As shown, when the braking resistor is connected, the first output terminal 3 and the second output terminal 4 of the optocoupler 2 are not connected, the inverting input terminal of the comparator 310 is at a low level, which is less than the reference voltage Vref at the non-inverting input terminal of the comparator 310, and the output of the comparator 310 is at a high level; when the braking resistor is not connected, the first output terminal 3 and the second output terminal 4 of the optocoupler 2 are connected, the inverting input terminal of the comparator 310 is at a high level, which is greater than the reference voltage Vref at the non-inverting input terminal of the comparator 310, and the output of the comparator 310 is at a low level.

[0072] Furthermore, the comparison module 3 also includes a sixth resistor R6, a seventh resistor R7, and a second capacitor C2;

[0073] The first end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, and the second end of the sixth resistor R6 is grounded.

[0074] The second terminal of the seventh resistor R7 is connected to the inverting input terminal of the comparator 310;

[0075] The first end of the second capacitor C2 is connected to the inverting input of the comparator 310, and the second end of the second capacitor C2 is grounded.

[0076] like Figure 1 As shown, when the braking resistor is not connected, pins 3 and 4 of optocoupler 2 are conducting. At this time, the second capacitor C2 is charging. Since the second capacitor C2 is a large-capacity electrolytic capacitor, the time constant τ = R6||R7×C2. Before charging to the preset threshold, after the braking resistor is connected between the braking terminal B and the DC power supply terminal DC+, pins 3 and 4 of optocoupler 2 are cut off, and the second capacitor C2 discharges. At this time, the back-end comparator 310 still outputs a high level, and the driver operates normally. This allows for a certain recovery time to eliminate the fault, reducing the number of times the driver stops due to braking overload faults. It also avoids the shutdown accident caused by the driver still stopping due to braking overload alarm after the braking resistor is detected and reconnected immediately when the driver is just started and the braking resistor is not connected.

[0077] In an optional embodiment, the braking overload detection and protection circuit further includes a driver chip, the Desat protection pin of which is connected to the first end of the sixth capacitor C6, and the second end of the sixth capacitor C6 is grounded.

[0078] Figure 2 This is a schematic diagram of the braking drive circuit provided by this utility model, as shown below. Figure 2 As shown, when the braking resistor is short-circuited, a shoot-through short circuit (Class I short circuit) will occur when the IGBT of the braking bridge arm is turned on. Since the driver chip that drives the IGBT of the braking bridge arm has a Desat protection pin, when the short-circuit current rises to a certain value, the Desat capacitor (sixth capacitor C6) connected to the driver chip will be charged to the trigger threshold. At this time, the IGBT will be turned off due to the Desat short-circuit protection. At this time, the Fault pin outputs a low level, reporting a short-circuit fault.

[0079] Figure 3 This is a schematic diagram of the working process of the brake overload detection and protection circuit provided by this utility model, as shown below. Figure 3 As shown, when the servo driver is working, the three-phase power grid is connected to the power input. The uncontrolled three-phase rectifier bridge integrated in the IGBT module converts the 380VAC input from the power grid to 513VDC for the bus. When the braking resistor is not connected to the braking terminal B, the optocoupler 2 is turned on, and the comparator 310 outputs a low level, indicating a braking overload fault. When the braking resistor is connected to the braking terminal B, the optocoupler 2 is turned off, and the comparator 310 outputs a high level, indicating normal braking. When a short circuit occurs in the braking resistor, the Desat capacitor C6 of the driver chip is charged to the trigger threshold, and the IGBT is turned off due to the Desat short-circuit protection.

[0080] On the other hand, this utility model also provides a chip, which includes any of the above-mentioned braking overload detection and protection circuits.

[0081] In another aspect, the present invention also provides an electronic device, which includes any of the above-mentioned braking overload detection and protection circuits, or includes the above-mentioned chip.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A braking overload detection and protection circuit, characterized in that, include: The system comprises a control module (1), an optocoupler (2), and a comparator module (3), wherein: The control module (1) is connected to the optocoupler (2) and is used to control the on / off state of the optocoupler (2) based on the braking resistor. The first input terminal of the comparison module (3) is connected to the first output terminal of the optocoupler (2), and the second input terminal of the comparison module (3) is used to receive a reference signal to output a brake overload indication signal that characterizes whether a brake overload fault exists based on the reference signal.

2. The braking overload detection and protection circuit according to claim 1, characterized in that, The control module (1) includes: The first control unit (110) is connected to the first input terminal of the optocoupler (2) and is used to output a first control signal to the first input terminal of the optocoupler (2); The second control unit (120) is connected to the second input terminal of the optocoupler (2) and is used to output a second control signal to the second input terminal of the optocoupler (2).

3. The braking overload detection and protection circuit according to claim 2, characterized in that, The first control unit (110) includes a first resistor (R1), a second resistor (R2), and a first transistor (Q1); The first end of the first resistor (R1) is connected to the braking terminal, and the second end of the first resistor (R1) is connected to the base of the first transistor (Q1); The first terminal of the second resistor (R2) is connected to the base of the first transistor (Q1), and the second terminal of the second resistor (R2) is grounded; The collector of the first transistor (Q1) is connected to the first input terminal of the optocoupler (2), and the emitter of the first transistor (Q1) is grounded.

4. The braking overload detection and protection circuit according to claim 3, characterized in that, The first control unit (110) further includes a first diode (D1), a first capacitor (C1), and a third resistor (R3); The positive terminal of the first diode (D1) is connected to the base of the first transistor (Q1), and the negative terminal of the first diode (D1) is connected to the power supply voltage (VDD). The first terminal of the first capacitor (C1) is connected to the power supply voltage (VDD), and the second terminal of the first capacitor (C1) is grounded. The first end of the third resistor (R3) is connected to the power supply voltage (VDD), and the second end of the third resistor (R3) is connected to the first input terminal of the optocoupler (2).

5. The braking overload detection and protection circuit according to claim 2, characterized in that, The second control unit (120) includes a fourth resistor (R4), a fifth resistor (R5), and a second transistor (Q2); The first end of the fourth resistor (R4) is connected to the DC power supply terminal (DC+), and the second end of the fourth resistor (R4) is connected to the base of the second transistor (Q2); The first terminal of the fifth resistor (R5) is connected to the base of the second transistor (Q2), and the second terminal of the fifth resistor (R5) is grounded; The collector of the second transistor (Q2) is connected to the second input terminal of the optocoupler (2), and the emitter of the second transistor (Q2) is grounded.

6. The braking overload detection and protection circuit according to any one of claims 1-5, characterized in that, The comparison module (3) includes a comparator (310), the inverting input of the comparator (310) is connected to the first output of the optocoupler (2), the non-inverting input of the comparator (310) is connected to the reference voltage (Vref), and the output of the comparator (310) is connected to the brake overload alarm pin (BRA).

7. The braking overload detection and protection circuit according to claim 6, characterized in that, The comparison module (3) also includes a sixth resistor (R6), a seventh resistor (R7), and a second capacitor (C2); The first terminal of the sixth resistor (R6) is connected to the first terminal of the seventh resistor (R7), and the second terminal of the sixth resistor (R6) is grounded; The second terminal of the seventh resistor (R7) is connected to the inverting input terminal of the comparator (310); The first terminal of the second capacitor (C2) is connected to the inverting input terminal of the comparator (310), and the second terminal of the second capacitor (C2) is grounded.

8. The braking overload detection and protection circuit according to claim 1, characterized in that, The braking overload detection and protection circuit also includes a driver chip, the Desat protection pin of which is connected to the first end of the sixth capacitor (C6), and the second end of the sixth capacitor (C6) is grounded.

9. A chip having an integrated circuit integrated thereon, characterized in that, The integrated circuit includes the braking overload detection and protection circuit as described in any one of claims 1-8.

10. An electronic device, characterized in that, include: The braking overload detection and protection circuit as described in any one of claims 1-8, or including the chip as described in claim 9.

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