Redundant self-locking power supply control circuit, electronic mechanical braking system and automobile

Abstract

The invention provides a redundant self-locking power supply control circuit, an electronic mechanical braking system and an automobile, and relates to the technical field of braking control. A first power supply module is connected with a first power receiving module through a switching tube Q1 in sequence; the second power supply module is connected with the first power receiving module through a switching tube Q4; one input end of the comparator U1 is connected with reference voltage, the other input end of the comparator U1 is connected with the first power receiving module, and the output end of the comparator U1 is connected with the control end of the switching tube Q1 and the control end of the switching tube Q4. The problem that in the prior art, when a power supply in an electronic mechanical brake system goes wrong, time consumed for starting a standby power supply to supply power to a brake motor is long is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile brake control, and in particular to a redundant self-locking power supply control circuit, an electronic mechanical brake system and an automobile. Background Art

[0002] As a core component in the driving process of a car, the braking system is a key component of the active safety of the car, and it bears the important responsibility of ensuring driving safety. The braking system plays a role in controlling and decelerating the vehicle during driving, ensuring that the vehicle can stop or decelerate in time to avoid collisions and accidents. At present, in order to meet the high-precision and high-response requirements put forward by intelligent driving, more and more vehicle manufacturers and parts manufacturers choose wire control as the choice of the new generation of braking system. In the wire control braking system, the electromechanical braking system in the form of motor braking has become the mainstream of the industry.

[0003] The electronic mechanical braking system adopts electronically controlled pure mechanical braking technology to realize active safety control functions. It is not only easy to operate and low-cost, but also can accurately control the wheel braking torque and effectively avoid brake fluid leakage. It is safe and environmentally friendly. Its development will drive the automotive industry towards a safer, more comfortable and more humane direction.

[0004] However, in the existing electronic mechanical braking system, when there is a problem with the power supply in the electronic mechanical braking system, the software actively samples the voltage at the brake motor, and after diagnosing undervoltage, the backup power supply is enabled to power the brake motor. During the above execution process, a long time is wasted, resulting in countless accidents caused by brake failure due to power failure. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a redundant self-locking power supply control circuit, an electronic mechanical braking system and a vehicle, which solves the problem in the prior art that when a problem occurs in the power supply of the electronic mechanical braking system, it takes a long time to activate the backup power supply to power the brake motor.

[0006] At least one embodiment of the present invention provides a redundant self-locking power supply control circuit, including: a first power supply module, a first power receiving module, a second power supply module, a switch tube Q1, a switch tube Q4 and a comparator U1, wherein:

[0007] The first power supply module is connected to the first power receiving module via the first end of the switch tube Q1 and the second end of the switch tube Q1 in sequence;

[0008] The second power supply module is connected to the first power receiving module via the first end of the switch tube Q4 and the second end of the switch tube Q4 in sequence;

[0009] One of the input ends of the comparator U1 is connected to a reference voltage, the other input end of the comparator U1 is connected to the first power receiving module to receive the voltage of the first power receiving module, the output end of the comparator U1 is respectively connected to the control end of the switch tube Q1 and the control end of the switch tube Q4, and the output end of the comparator U1 is configured to output a first preset level when the ratio of the voltage of the first power receiving module to the reference voltage is lower than a preset value;

[0010] The control end of the switch tube Q1 is configured to turn off the switch tube Q1 when receiving the first preset level, and the control end of the switch tube Q4 is configured to turn on the switch tube Q4 when receiving the first preset level.

[0011] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0012] When an abnormality occurs in the first power supply module and causes a voltage drop, another output end of the comparator U1 receives the dropped voltage and compares it with the reference voltage, thereby outputting a first preset level;

[0013] The switch tube Q1 can be quickly turned off and the switch tube Q4 can be turned on by the first preset level, so that the second power supply module can be used to supply power to the first power receiving module;

[0014] Compared with the prior art, the present invention triggers the power supply of the second power supply module through the hardware of the comparator U1, and can control the startup of the corresponding backup power supply without waiting for software detection, thereby reducing the time wasted in switching the backup power supply and reducing the occurrence rate of accidents.

[0015] In a redundant self-locking power supply control circuit provided in one embodiment of the present invention, the circuit further includes: a switch tube Q5, a control chip and a second power receiving module, wherein:

[0016] The second power supply module is connected to the second power receiving module via the first end of the switch tube Q5 and the second end of the switch tube Q5 in sequence;

[0017] The control chip is respectively connected to the control end of the switch tube Q1 , the control end of the switch tube Q4 , and the control end of the switch tube Q5 .

[0018] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0019] When the vehicle is operating normally, the second power supply module is the power supply of the second power receiving module. At this time, the switch tubes Q1 and Q5 are turned on, and the switch tube Q4 is turned off.

[0020] When the first power receiving module fails, the control chip can control the switch tube Q1 to be disconnected to disconnect the connection between the first power supply module and the first power receiving module;

[0021] When the second power receiving module fails, the control chip can control the switch tube Q5 to be disconnected to disconnect the connection between the second power supply module and the second power receiving module;

[0022] When the second power supply module fails, the control chip can control the switch tube Q4 to open, so as to use the first power supply module to supply power to the first power receiving module and the second power receiving module at the same time.

[0023] Through the above control, the mutual switching of power supply between the first power supply module and the second power supply module can be realized, which greatly improves the safety and stability of the circuit during operation.

[0024] In a redundant self-locking power supply control circuit provided in one embodiment of the present invention, the circuit further includes: a self-locking module, through which the output end of the comparator U1 is connected to the control end of the switch tube Q4;

[0025] The self-locking module is configured to output a second preset level and enter self-locking when receiving the first preset level of the output of the comparator U1 , wherein the second preset level is used to control the opening of the switch tube Q4 .

[0026] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0027] When an abnormality occurs in the first power supply module, after the output end of the comparator U1 controls the switch tube Q4 to open, the above-mentioned self-locking module can be used to lock the state of the switch tube Q4 to avoid intermittent failure of the voltage provided by the first power supply module, which causes the switch tube Q4 to be intermittently turned on or off, causing the power supply to the first power receiving module to fluctuate greatly and cannot be controlled.

[0028] In a redundant self-locking power supply control circuit provided in one embodiment of the present invention, the self-locking module includes: a first voltage source, a switch tube Q11, a switch tube Q12, a switch tube Q13 and a switch tube Q14, wherein:

[0029] The output end of the comparator U1 is connected to the control end of the switch tube Q11, so as to turn on the switch tube Q11 when the output end outputs a first preset level;

[0030] The first voltage source is connected to the control end of the switch tube Q12 through the first end of the switch tube Q11 and the second end of the switch tube Q11 in sequence, the first end of the switch tube Q12 is connected to the common end, and the second end of the switch tube Q12 is connected to the control end of the switch tube Q13, so that the switch tube Q13 is turned on when the switch tube Q11 is turned on;

[0031] The first voltage source is connected to the control end of the switch tube Q12 via the first end of the switch tube Q13 and the second end of the switch tube Q13 in sequence, so as to provide a working voltage for the control end of the switch tube Q12 when the switch tube Q13 is turned on;

[0032] The second end of the switch tube Q12 is also connected to the switch tube Q14 to control the switching of the switch tube Q14. The first voltage source is also connected to the control end of the switch tube Q4 through the first end of the switch tube Q14 and the second end of the switch tube Q14 in sequence.

[0033] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0034] By using the above scheme, when the comparator U1 outputs a preset level, the switch tubes Q11, Q12, Q13 and Q14 can be turned on in sequence, and the voltage output by the switch tube Q13 can be used to return and force the switch tube Q12 to be turned on. At this time, the opening and closing state of the switch tube Q12 is independent of the switch tube Q11, thereby achieving self-locking.

[0035] In a redundant self-locking power supply control circuit provided in one embodiment of the present invention, the circuit further includes an unlocking module, and the unlocking module includes a switch tube Q15, wherein:

[0036] The first end of the switch tube Q15 is connected to the common end, the second end of the switch tube Q15 is connected to the control end of the switch tube Q12, and the control end of the switch tube Q15 is configured to receive a disconnection signal of a control chip.

[0037] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0038] By controlling the first and second ends of the switch tube Q15, when the switch tube Q15 is turned on, the control end of the switch tube Q12 can be forced to be grounded and pulled down, thereby turning off the switch tube Q121 and the switch tube Q14 to unlock the self-locking module.

[0039] In a redundant self-locking power supply control circuit provided in one embodiment of the present invention, the circuit further includes a diode D5, and the output end of the comparator U1 is connected to the control end of the switch tube Q1 through the diode D5.

[0040] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0041] By using the diode D5, on the one hand, the signal output by the control chip can be isolated from reaching the self-locking module through the output end of the comparator U1, so as to interfere with the normal operation of the self-locking module;

[0042] Secondly, the diode D5 can be used to pull down the output of the comparator U1 to trigger the switch tube Q1 to be turned off more stably.

[0043] In a redundant self-locking power supply control circuit provided in one embodiment of the present invention, the reference voltage is provided by an input voltage module and a voltage regulator source connected in sequence, wherein:

[0044] The input voltage module includes a switch tube Q6, a switch tube Q7 and a second voltage source, the control end of the switch tube Q6 is configured to receive a disconnection signal of the control chip, the first end of the switch tube Q6 is connected to the common end, and the second end of the switch tube Q6 is connected to the control end of the switch tube Q7;

[0045] The second voltage source is connected to the input voltage end of the voltage stabilizing source through the first end of the switch tube Q7 and the second end of the switch tube Q7 , and the output voltage end of the voltage stabilizing source is connected to one of the input ends of the comparator U1 .

[0046] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0047] The second voltage source provides voltage to the voltage stabilizing source through the switch tubes Q6 and Q7, so as to prevent excessive leakage current in the standby state.

[0048] In a redundant self-locking power supply control circuit provided by one of the embodiments of the present invention, the circuit also includes a self-test module, which includes: a switch tube Q8, a switch tube Q9 and a third voltage source. The control end of the switch tube Q8 is configured to receive a disconnection signal of a control chip. The first end of the switch tube Q8 is connected to a common end, the second end of the switch tube Q8 is connected to the control end of the switch tube Q9, and the third voltage source is connected to one of the input ends of the comparator U1 through the first end of the switch tube Q9 and the second end of the switch tube Q9.

[0049] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0050] The switch tubes Q8 and Q9 can be used to prevent excessive leakage current in the standby state.

[0051] By connecting the third power supply to one of the input terminals of the comparator U1 , the comparator U1 can be actively triggered to output a preset level, thereby achieving self-checking of the circuit.

[0052] The present invention also provides an electronic mechanical braking system, comprising a system body and a redundant self-locking power supply control circuit as described above, wherein the first power receiving module is a brake motor.

[0053] The present invention also provides a car, comprising the above-mentioned electronic mechanical braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic diagram of the connection structure of a redundant self-locking power supply control circuit according to the present invention;

[0055] Figure 2 A circuit diagram of a part of a redundant self-locking power supply control circuit according to the present invention;

[0056] Figure 3 The present invention is a circuit diagram of another part of a redundant self-locking power supply control circuit.

[0057] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0058] S100, first power supply module; S200, first power receiving module; S300, second power supply module; S400, second power receiving module; S500, self-locking module; S501, input unit; S502, self-locking unit; S503, output unit; S600, unlocking module; S700, self-test module; S800, voltage stabilizing source; S900, input voltage module. DETAILED DESCRIPTION

[0059] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0060] The present invention provides a redundant self-locking power supply control circuit, please refer to Figure 1 As shown, it includes: a first power supply module S100, a first power receiving module S200, a second power supply module S300, a switch tube Q1, a switch tube Q4 and a comparator U1, wherein:

[0061] The first power supply module S100 is connected to the first power receiving module S200 via the first end of the switch tube Q1 and the second end of the switch tube Q1 in sequence;

[0062] The second power supply module S300 is connected to the first power receiving module S200 via the first end of the switch tube Q4 and the second end of the switch tube Q4 in sequence;

[0063] One of the input ends of the comparator U1 is connected to a reference voltage, the other input end of the comparator U1 is connected to the first power receiving module S200 to receive the voltage of the first power receiving module S200, the output end of the comparator U1 is respectively connected to the control end of the switch tube Q1 and the control end of the switch tube Q4, and the output end of the comparator U1 is configured to output a first preset level when the ratio of the voltage of the first power receiving module S200 to the reference voltage is lower than a preset value;

[0064] The control end of the switch tube Q1 is configured to turn off the switch tube Q1 when receiving the first preset level, and the control end of the switch tube Q4 is configured to turn on the switch tube Q4 when receiving the first preset level.

[0065] When an abnormality occurs in the first power supply module S100 and causes a voltage drop, another output terminal of the comparator U1 receives the dropped voltage and compares it with the reference voltage, thereby outputting a first preset level;

[0066] The switch tube Q1 can be quickly turned off and the switch tube Q4 can be turned on through the first preset level, so that the second power supply module S300 can be used to supply power to the first power receiving module S200;

[0067] Compared with the prior art, the present invention triggers the power supply of the second power supply module S300 through the hardware of the comparator U1, and can control the startup of the corresponding backup power supply without waiting for software detection, thereby reducing the time wasted in switching the backup power supply and reducing the occurrence rate of accidents.

[0068] Better, please combine here Figure 1 , Figure 2 and Figure 3 As shown, the circuit also includes: a switch tube Q5, a control chip and a second power receiving module S400, wherein Figure 3 In the figure, the voltage of the first power receiving module S200 is represented by VM, and the voltage VM is connected to the ground through the resistor R8 and the resistor R7 in sequence to realize the voltage division of the voltage VM, and the voltage VM is also connected to the other input terminal of the comparator U1 through the resistor R8 and the resistor R9;

[0069] The second power supply module S300 is connected to the second power receiving module S400 via the first end of the switch tube Q5 and the second end of the switch tube Q5 in sequence;

[0070] The control chip is connected to the control end of the switch tube Q1, the control end of the switch tube Q4 and the control end of the switch tube Q5 respectively. For the convenience of distinction, in this embodiment, the pin end MCU_CTRL2 of the control chip is connected to the control end of the switch tube Q1, the pin end MCU_CTRL8 of the control chip is connected to the control end of the switch tube Q5, and the pin end MCU_CTRL1 of the control chip is connected to the control end of the switch tube Q4. Figure 2 and Figure 3 In the embodiment, the pin end MCU_CTRL2 is connected to the control of the switch tube Q1 through the resistor R31 and the port OUT2_EN in sequence, and the pin end MCU_CTRL1 is connected to the control of the switch tube Q4 through the diode D7 and the port OUT1_EN in sequence;

[0071] When the vehicle is operating normally, the second power supply module S300 is the power supply of the second power receiving module S400. At this time, the switch tubes Q1 and Q5 are turned on, and the switch tube Q4 is turned off.

[0072] When the first power receiving module S200 fails, the control chip can control the switch tube Q1 to be disconnected to disconnect the connection between the first power supply module S100 and the first power receiving module S200;

[0073] When the second power receiving module S400 fails, the control chip can control the switch tube Q5 to be disconnected to disconnect the connection between the second power supply module S300 and the second power receiving module S400;

[0074] When the second power supply module S300 fails, the control chip can control the switch tube Q4 to open, so as to use the first power supply module S100 to supply power to the first power receiving module S200 and the second power receiving module S400 at the same time.

[0075] Through the above control, the mutual switching of power supply between the first power supply module S100 and the second power supply module S300 can be achieved, which greatly improves the safety and stability of the circuit during operation.

[0076] More preferably, the circuit further includes a switch tube Q3 and a switch tube Q2, wherein the first power supply module S100 is connected to the first power receiving module S200 via the first end of the switch tube Q1, the second end of the switch tube Q1, the first end of the switch tube Q3 and the second end of the switch tube Q3 in sequence, and the second end of the switch tube Q3 is connected to the second end of the switch tube Q4;

[0077] The second power supply module S300 is connected to the second power receiving module S400 via the first end of the switch tube Q2, the second end of the switch tube Q2, the first end of the switch tube Q5 and the second end of the switch tube Q5 in sequence, and the second end of the switch tube Q2 is connected to the first end of the switch tube Q4;

[0078] The pin end MCU_CTRL6 of the control chip is used to control the opening and closing of the switch tube Q2, and the pin end MCU_CTRL7 of the control chip is used to control the opening and closing of the switch tube Q3;

[0079] By using the switch tube Q3 and the switch tube Q2, power reverse protection can be implemented to prevent excessive voltage on the first power receiving module S200 and the second power receiving module S400 from flowing back to the first power supply module S100 and the second power supply module S300.

[0080] Preferably, the circuit further comprises: a self-locking module S500, the output end of the comparator U1 is connected to the control end of the switch tube Q4 through the self-locking module S500;

[0081] The self-locking module S500 is configured to output a second preset level and enter self-locking when receiving the first preset level of the output of the comparator U1, wherein the second preset level is used to control the opening of the switch tube Q4.

[0082] When an abnormality occurs in the first power supply module S100, after the output end of the comparator U1 controls the switch tube Q4 to open, the self-locking module S500 can be used to lock the state of the switch tube Q4 to avoid intermittent failure of the voltage provided by the first power supply module S100, which causes the switch tube Q4 to be intermittently turned on or off, causing the power supply to the first power receiving module S200 to fluctuate greatly and cannot be controlled.

[0083] Specifically, the self-locking module S500 includes: an input unit S501, a self-locking unit S502 and an output unit S503, wherein the input unit S501 includes: a first voltage source, a switch tube Q11, a resistor R13 and a resistor R14, the self-locking unit S502 includes: a switch tube Q12, a switch tube Q13, a resistor R15, a resistor R16, a resistor R17, a resistor R19 and a resistor R20, and the output unit S503 includes: a switch tube Q14, a resistor R21, a resistor R22 and a resistor R23. In this embodiment, the switch tube Q11 is a PNP transistor, the switch tube Q12 is an NPN transistor, the switch tube Q13 is a PNP transistor, and the switch tube Q14 is a PNP transistor. It should be noted that in this embodiment, the first voltage source, and the second voltage source and the third voltage source that appear later are all in Figure 3 It is indicated by UG_12V;

[0084] The output end of the comparator U1 is connected to the control end of the switch tube Q11 through the resistor R13. It should be understood that the control end referred to herein is the gate end of the triode. If the switch tube is a MOS tube, the control end is the base end. If the switch tube referred to in the following text is a triode, its first end is the emitter end and the second end is the collector end, so that when the output end outputs the first preset level, the switch tube Q11 is turned on. The first end of the switch tube Q11 is connected to its control end through the resistor R14.

[0085] The first voltage source UG_12V is connected to the control end of the switch tube Q12 through the first end of the switch tube Q11, the second end of the switch tube Q11 and the resistor R15 in sequence. The first end of the switch tube Q12 is connected to the common end, the first end of the switch tube Q12 is connected to its control end through the resistor R17, and the second end of the switch tube Q12 is connected to the control end of the switch tube Q13 through the resistor R20, so that when the switch tube Q11 is turned on, the switch tube Q13 is turned on, and the first end of the switch tube Q13 is connected to its control end through the resistor R19;

[0086] The first voltage source UG_12V is connected to the control end of the switch tube Q12 through the first end of the switch tube Q13, the second end of the switch tube Q13 and the resistor R16 in sequence, so as to provide a working voltage for the control end of the switch tube Q12 when the switch tube Q13 is turned on;

[0087] The second end of the switch tube Q12 is also connected to the switch tube Q14 through the resistor R21 to control the switching of the switch tube Q14. The first end of the switch tube Q14 is connected to its control end through the resistor R22. The first voltage source UG_12V is also connected to the output port OUT1_EN through the first end of the switch tube Q14, the second end of the switch tube Q14, the resistor R23 and the diode D6 in sequence. The port OUT1_EN is connected to the control end of the switch tube Q4 through an inverter.

[0088] By using the above scheme, when the comparator U1 outputs a preset level, the switch tubes Q11, Q12, Q13 and Q14 can be turned on in sequence, and the voltage output by the switch tube Q13 is used to return and force the switch tube Q12 to be turned on. At this time, the on / off state of the switch tube Q12 is independent of the switch tube Q11, thereby achieving self-locking. The first voltage source UG_12V can provide a working voltage for the switch tube Q4 through the turned-on switch tube Q14.

[0089] Preferably, the circuit further includes an unlocking module S600, and the unlocking module S600 includes a switch tube Q15 and a resistor R18, wherein:

[0090] The first end of the switch tube Q15 is connected to the common end, the second end of the switch tube Q15 is connected to the control end of the switch tube Q12, and the control end of the switch tube Q15 is configured to receive a switching signal of the control chip. Specifically, the pin end MCU_CTRL4 of the control chip is connected to the control end of the switch tube Q15 through the resistor R18 to control the on and off of the switch tube Q15.

[0091] By controlling the first and second ends of the switch tube Q15, when the switch tube Q15 is turned on, the control end of the switch tube Q12 can be forced to be grounded and pulled down, thereby turning off the switch tube Q121 and the switch tube Q14 to unlock the self-locking module S500.

[0092] Preferably, the circuit further includes a diode D5, and the output end of the comparator U1 is connected to the control end of the switch tube Q1 through the diode D5 and the output port OUT2_EN in sequence.

[0093] By using the diode D5, on the one hand, the signal output by the control chip can be isolated from reaching the self-locking module S500 through the output end of the comparator U1, so as to interfere with the normal operation of the self-locking module S500;

[0094] Secondly, the diode D5 can be used to pull down the output of the comparator U1 to more stably trigger the switch tube Q1 to be turned off.

[0095] Preferably, the reference voltage is provided by an input voltage module S900 and a voltage regulator S800 connected in sequence, wherein:

[0096] The input voltage module S900 includes a switch tube Q6, a switch tube Q7, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a second voltage source UG_12V, the voltage regulator source S800 includes a voltage regulator tube D3, a resistor R5 and a resistor R6, wherein the voltage regulator tube D3 is of a type t1431, the control end of the switch tube Q6 is configured to receive a disconnection signal of a control chip, specifically, the pin end MCU_CTRL3 of the control chip is connected to the control end of the switch tube Q6 through the resistor R1 to control its disconnection, the control end of the switch tube Q6 is connected to its first end through the resistor R2 and is grounded, the second end of the switch tube Q6 is connected to the control end of the switch tube Q7 through the resistor R3, and the control end of the switch tube Q7 is also connected to its first end through the resistor R4;

[0097] The second voltage source UG_12V is connected to the input voltage end of the voltage stabilizing source S800 through the first end of the switch tube Q7, the second end of the switch tube Q7 and the resistor R33 in sequence, that is, the resistor R33 is grounded through the resistor R6 and the resistor R5 in sequence, the reference electrode of the voltage stabilizing tube D3 is connected between the resistor R6 and the resistor R5, the anode end of the voltage stabilizing tube D3 is grounded, and the cathode end of the voltage stabilizing tube D3 is the output voltage end. The output voltage end of the voltage stabilizing source S800 is connected to one of the input ends of the comparator U1 through the resistor R11, and one of the input ends of the comparator U1 is grounded. In this embodiment, one of the input ends of the comparator U1 is specifically its cathode end, and the other input end of the comparator U1 is its anode end. The first preset level is a low level.

[0098] The second voltage source UG_12V provides voltage to the voltage stabilizing source S800 through the switch tubes Q6 and Q7, so as to prevent excessive leakage current in the standby state.

[0099] Preferably, the circuit further includes a self-test module S700, which includes: a switch tube Q8, a switch tube Q9, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29 and a third voltage source UG_12V. The control end of the switch tube Q8 is configured to receive a disconnection signal of the control chip. Specifically, the control chip MCU_CTRL5 is connected to the control end of the switch tube Q8 through the resistor R25 to control its disconnection. The first end of the switch tube Q8 is connected to the common end. The first end of the switch tube Q8 is also connected to its control end through a resistor R24, the second end of the switch tube Q8 is connected to the control end of the switch tube Q9 through a resistor R27, the control end of the switch tube Q9 is connected to its first end through a resistor R26, the third voltage source UG_12V is connected to one of the input ends of the comparator U1 through the first end of the switch tube Q9, the second end of the switch tube Q9, the resistor R29 and the diode D4 in sequence, and the resistor R29 is also grounded through a resistor R28.

[0100] The switch tubes Q8 and Q9 can be used to prevent excessive leakage current in the standby state.

[0101] By connecting the third power supply to one of the input terminals of the comparator U1 , the comparator U1 can be actively triggered to output a preset level, thereby achieving self-checking of the circuit.

[0102] Preferably, the pin end MCU_OUT2_FB of the control chip is also connected to the output end of the comparator U1 through a resistor R30 to detect the output state of the comparator U1 in real time, and the pin end MCU_OUT1_FB of the control chip is connected to the output port OUT1_EN through a resistor R32 to detect the output state of the self-locking module S500 in real time.

[0103] Preferably, the circuit includes a third voltage source UG_12V, and the third voltage source UG_12V is connected to the output end of the comparator U1 through a resistor R12.

[0104] The working process of the present invention is:

[0105] 1. During normal power-on, the voltage VM of the first power receiving module S200 and the output voltage of the voltage regulator S800 each generate a threshold voltage to supply to the cathode and anode terminals of the comparator U1 respectively. When the threshold voltage of the voltage VM is higher than the threshold voltage of the output voltage of the voltage regulator S800, the comparator U1 outputs a high level. At this time, each switch tube is actively controlled to be turned on and off by the control chip according to the system status. The control chip can actively control the opening of the switch tube Q8 through MCU_CTRL5 to perform circuit status self-check to determine whether the circuit has a fault and whether it operates normally without a fault.

[0106] 2. When an abnormal working state occurs, the vehicle is in the process of braking, and the main power supply fails. At this time, the voltage VM drops rapidly due to the operation of the motor. When the voltage VM drops to a threshold voltage lower than the output voltage of the voltage regulator S800, the comparator U1 is triggered to flip and output a low level, and then the enable signal of the switch tube Q1 is pulled low through the output port OUT2_EN, and the path between the first power supply module S100 and the first power receiving module S200 is turned off (that is, when OUT2_EN receives a low level, the main power supply path can be controlled to be turned off), and the self-locking module S500 is triggered to work at the same time, and the switch tube Q4 is turned on through the output port OUT1_EN instantly, and the first power supply module S100 and the first power receiving module S200 are used. The second power supply module S300 supplies power to the second power receiving module S400 and the first power receiving module S200 at the same time to ensure that the energy supply of the brake motor is quickly restored, and at the same time prevent the first power supply module S100 and the second power supply module S300 from being turned on at the same time, causing the second power supply module S300 to be affected by the failure of the first power supply module S100, resulting in abnormal system operation; the purpose of the self-locking module S500 is to prevent the software from being unable to control when the power supply of the first power supply module S100 fluctuates too much. After the system returns to normal, the control chip can unlock the circuit through the unlocking module S600 when it recognizes that the system power supply is normal, ensuring that the system continues to work safely and stably;

[0107] 3. If an abnormality occurs in this circuit (comparator U1 works abnormally or self-locking module S500 is abnormal), since the output of comparator U1 has a power pull-up, diode D5 will isolate the third voltage source UG_12V and the high-level voltage output by the control chip. At this time, the enable signal OUT2_EN is completely controlled by MCU_CTRL2, and OUT1_EN is completely controlled by MCU_CTRL1, which does not affect the normal operation of the system.

[0108] This circuit adopts dual power supply control power supply mode, and the two power supplies can also back up each other to ensure the safety and reliability of the system;

[0109] In the event of an accident, power backup is achieved by triggering the switch Q4 through hardware. Compared with software monitoring, this can shorten the time to identify and handle faults. For the braking system, this time is crucial to ensure vehicle safety.

[0110] The self-locking and unlocking methods can improve the stability of the system during operation and ensure that the system is safe and controllable in real time.

[0111] The use of software and hardware redundancy to control the output of enable signals OUT1_EN and OUT2_EN can improve the system functional safety level and provide a better user experience for the product.

[0112] The present invention also provides an electronic mechanical braking system, including a system body and a redundant self-locking power supply control circuit as described above, wherein the first power receiving module S200 is a brake motor, and an LC filter module is also arranged between the brake motor and the switch tube Q1, and the LC filter module specifically includes an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6.

[0113] The present invention also provides a car, comprising the above-mentioned electronic mechanical braking system.

[0114] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0115] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A redundant self-locking power supply control circuit, characterized in that: include: A first power supply module (S100), a first power receiving module (S200), a second power supply module (S300), a switch tube Q1, a switch tube Q4 and a comparator U1, wherein: The first power supply module (S100) is connected to the first power receiving module (S200) in sequence through the first end of the switch tube Q1 and the second end of the switch tube Q1; The second power supply module (S300) is connected to the first power receiving module (S200) in sequence through the first end of the switch tube Q4 and the second end of the switch tube Q4; One of the input ends of the comparator U1 is connected to a reference voltage, the other input end of the comparator U1 is connected to the first power receiving module (S200) to receive the voltage of the first power receiving module (S200), the output end of the comparator U1 is respectively connected to the control end of the switch tube Q1 and the control end of the switch tube Q4, and the output end of the comparator U1 is configured to output a first preset level when the ratio of the voltage of the first power receiving module (S200) to the reference voltage is lower than a preset value; The control end of the switch tube Q1 is configured to turn off the switch tube Q1 when receiving the first preset level, and the control end of the switch tube Q4 is configured to turn on the switch tube Q4 when receiving the first preset level.

2. A redundant self-locking power supply control circuit according to claim 1, characterized in that: The circuit further includes: a switch tube Q5, a control chip and a second power receiving module (S400), wherein: The second power supply module (S300) is connected to the second power receiving module (S400) in sequence through the first end of the switch tube Q5 and the second end of the switch tube Q5; The control chip is respectively connected to the control end of the switch tube Q1 , the control end of the switch tube Q4 , and the control end of the switch tube Q5 .

3. A redundant self-locking power supply control circuit according to claim 1 or 2, characterized in that: The circuit further comprises: a self-locking module (S500), the output end of the comparator U1 is connected to the control end of the switch tube Q4 through the self-locking module (S500); The self-locking module (S500) is configured to output a second preset level and enter self-locking when receiving the first preset level of the output of the comparator U1, wherein the second preset level is used to control the opening of the switch tube Q4.

4. A redundant self-locking power supply control circuit according to claim 3, characterized in that: The self-locking module (S500) includes: a first voltage source, a switch tube Q11, a switch tube Q12, a switch tube Q13 and a switch tube Q14, wherein: The output end of the comparator U1 is connected to the control end of the switch tube Q11, so as to turn on the switch tube Q11 when the output end outputs a first preset level; The first voltage source is connected to the control end of the switch tube Q12 through the first end of the switch tube Q11 and the second end of the switch tube Q11 in sequence, the first end of the switch tube Q12 is connected to the common end, and the second end of the switch tube Q12 is connected to the control end of the switch tube Q13, so that the switch tube Q13 is turned on when the switch tube Q11 is turned on; The first voltage source is connected to the control end of the switch tube Q12 via the first end of the switch tube Q13 and the second end of the switch tube Q13 in sequence, so as to provide a working voltage for the control end of the switch tube Q12 when the switch tube Q13 is turned on; The second end of the switch tube Q12 is also connected to the switch tube Q14 to control the switching of the switch tube Q14. The first voltage source is also connected to the control end of the switch tube Q4 through the first end of the switch tube Q14 and the second end of the switch tube Q14 in sequence.

5. A redundant self-locking power supply control circuit according to claim 4, characterized in that: The circuit further includes an unlocking module (S600), wherein the unlocking module (S600) includes a switch tube Q15, wherein: The first end of the switch tube Q15 is connected to the common end, the second end of the switch tube Q15 is connected to the control end of the switch tube Q12, and the control end of the switch tube Q15 is configured to receive a disconnection signal of a control chip.

6. A redundant self-locking power supply control circuit according to claim 4, characterized in that: The circuit further includes a diode D5, and the output end of the comparator U1 is connected to the control end of the switch tube Q1 through the diode D5.

7. A redundant self-locking power supply control circuit according to any one of claims 1 to 6, characterized in that: The reference voltage is provided by an input voltage module (S900) and a voltage stabilizing source (S800) connected in sequence, wherein: The input voltage module (S900) comprises a switch tube Q6, a switch tube Q7 and a second voltage source, the control end of the switch tube Q6 is configured to receive a disconnection signal of a control chip, the first end of the switch tube Q6 is connected to a common end, and the second end of the switch tube Q6 is connected to the control end of the switch tube Q7; The second voltage source is connected to the input voltage end of the voltage stabilizing source (S800) through the first end of the switch tube Q7 and the second end of the switch tube Q7, and the output voltage end of the voltage stabilizing source (S800) is connected to one of the input ends of the comparator U1.

8. A redundant self-locking power supply control circuit according to claim 7, characterized in that: The circuit also includes a self-test module (S700), which includes: a switch tube Q8, a switch tube Q9 and a third voltage source, the control end of the switch tube Q8 is configured to receive a disconnection signal of a control chip, the first end of the switch tube Q8 is connected to a common end, the second end of the switch tube Q8 is connected to the control end of the switch tube Q9, and the third voltage source is connected to one of the input ends of the comparator U1 through the first end of the switch tube Q9 and the second end of the switch tube Q9.

9. An electromechanical braking system, characterized in that: It comprises a system body and a redundant self-locking power supply control circuit as described in any one of claims 1 to 8, wherein the first power receiving module (S200) is a brake motor.

10. An automobile, characterized in that: Comprising an electromechanical braking system as claimed in claim 9.

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