A driving circuit and a motor controller

Abstract

The embodiment of the present invention discloses a driving circuit and a motor controller. The driving circuit includes an active short-circuit control module, an output prohibition control module and a power amplifier module, wherein the active short-circuit control module includes a first switch unit, and the first end of the first switch unit is electrically connected to the first power supply; the output prohibition control module includes a second switch unit, wherein the first end of the second switch unit is electrically connected to the pulse signal input end of the driving circuit; the control end of the second switch unit and the control end of the first switch unit are both electrically connected to the active short-circuit signal input end of the driving circuit; the second end of the second switch unit and the second end of the first switch unit are both electrically connected to the input end of the power amplifier module; the output end of the power amplifier module is electrically connected to the driving signal output end of the driving circuit. The technical solution provided by the embodiment of the present invention can realize the motor entering the active short-circuit state from the normal state.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to a drive circuit and a motor controller. Background Art

[0002] Motor controllers are used in fields such as electric vehicles. Their main function is to convert the DC power provided by the high-voltage battery into the three-phase AC power required by the motor, and then drive the motor under the control of the vehicle controller to provide driving or braking torque for the vehicle.

[0003] When the car is driving, if the motor controller fails, entering the active short-circuit state can reduce the braking torque, avoid a sudden drop in speed, and rear-end collision with the rear car; when the car is dragged by the driving wheel, entering the active short-circuit state can make the energy generated by the motor reversal directly consumed in the motor winding and power switch tube, avoiding the flow of electric energy to the DC bus side, generating high voltage to damage bus capacitors and power switches and other devices. Active short-circuit is to open the three lower bridge arms or three upper bridge arms at the same time through the motor controller, so as to short-circuit the three-phase stator winding of the motor. After the motor controller actively short-circuits the motor, the induced electromotive force generated by the motor rotation will generate current in the motor winding, which flows through the opened three-phase lower bridge arm (or upper bridge arm). There is no energy exchange between the motor and the high-voltage battery and the DC side capacitor, so the motor will only generate a small braking torque, thereby ensuring the safety of the vehicle. Therefore, it is very important to control the motor from the normal state to the active short-circuit state. Summary of the invention

[0004] The embodiments of the present invention provide a driving circuit and a motor controller to enable a motor to enter an active short-circuit state from a normal state.

[0005] In a first aspect, an embodiment of the present invention provides a driving circuit, including:

[0006] An active short-circuit control module comprises a first switch unit, wherein a first end of the first switch unit is electrically connected to a first power source;

[0007] The output disable control module comprises a second switch unit, wherein a first end of the second switch unit is electrically connected to a pulse signal input end of the drive circuit; a control end of the second switch unit and a control end of the first switch unit are both electrically connected to an active short-circuit signal input end of the drive circuit;

[0008] The power amplifier module, the second end of the second switch unit, and the second end of the first switch unit are all electrically connected to the input end of the power amplifier module; the output end of the power amplifier module is electrically connected to the driving signal output end of the driving circuit.

[0009] Further, the second switch unit includes a first switch tube and a first diode, wherein the first electrode of the first switch tube and the first electrode of the first diode are both electrically connected to the first end of the second switch unit; the second electrode of the first switch tube and the second electrode of the first diode are both electrically connected to the second end of the second switch unit; the control electrode of the first switch tube is electrically connected to the control end of the second switch unit;

[0010] The conduction direction of the first switch tube is opposite to the conduction direction of the first diode.

[0011] Furthermore, the first switch tube is a MOS tube, and the first switch tube is provided with a body diode, and the body diode serves as the first diode.

[0012] Furthermore, the active short-circuit control module further includes a first delay unit, wherein an input end of the first delay unit is electrically connected to an active short-circuit signal input end of the drive circuit, and an output end of the first delay unit is electrically connected to a control end of the first switch unit;

[0013] The output prohibition control module further includes a second delay unit, wherein an input end of the second delay unit is electrically connected to an active short-circuit signal input end of the drive circuit, and an output end of the second delay unit is electrically connected to a control end of the second switch unit;

[0014] The delay time of the first delay unit is greater than the delay time of the second delay unit.

[0015] Furthermore, the driving circuit further comprises a second switch tube, wherein the control electrode of the second switch tube is electrically connected to the active short-circuit signal input terminal of the driving circuit; the input terminal of the first delay unit and the input terminal of the second delay unit are both electrically connected to the first electrode of the second switch tube; and the second electrode of the second switch tube is grounded;

[0016] The first delay unit includes a first resistor, a second resistor and a first capacitor, wherein the input end of the first delay unit is electrically connected to the output end of the first delay unit via the first resistor; the second resistor and the first capacitor are connected in parallel; the first end of the second resistor and the first capacitor connected in parallel is electrically connected to the output end of the first delay unit; the second end of the second resistor and the first capacitor connected in parallel is electrically connected to the first end of the first switch unit;

[0017] The first switch unit includes a third switch tube, wherein a first electrode of the third switch tube is electrically connected to a first end of the first switch unit; a control electrode of the third switch tube is electrically connected to a control end of the first switch unit; a second electrode of the third switch tube is electrically connected to a second end of the first switch unit; and a junction capacitance between the control electrode and the first electrode of the third switch tube serves as a first capacitance.

[0018] Further, the output disable control module further includes: a level conversion unit, the level conversion unit includes a fourth switch tube, a third resistor and a fifth switch tube, wherein the control electrode of the fourth switch tube is electrically connected to the first electrode of the second switch tube; the first electrode of the fourth switch tube is electrically connected to the first power supply; the second electrode of the fourth switch tube is grounded via the third resistor; the second electrode of the fourth switch tube is electrically connected to the control electrode of the fifth switch tube; the first electrode of the fifth switch tube is electrically connected to the input end of the second delay unit; the second electrode of the fifth switch tube is electrically connected to the first power supply;

[0019] The second delay unit includes: a fourth resistor, a fifth resistor and a second capacitor, wherein the input end of the second delay unit is electrically connected to the output end of the second delay unit via the fourth resistor; the fifth resistor and the second capacitor are connected in parallel; the first end of the fifth resistor and the second capacitor connected in parallel is electrically connected to the output end of the second delay unit; the second end of the fifth resistor and the second capacitor connected in parallel is electrically connected to the first end of the second switch unit;

[0020] The second switch unit includes a first switch tube, wherein the first electrode of the first switch tube is electrically connected to the first end of the second switch unit; the control electrode of the first switch tube is electrically connected to the control end of the second switch unit; the second electrode of the first switch tube is electrically connected to the second end of the second switch unit; and the junction capacitance between the control electrode and the first electrode of the first switch tube serves as the second capacitance.

[0021] Furthermore, the third switch tube is a PMOS tube, the first electrode of the third switch tube is a source electrode, the control electrode of the third switch tube is a gate electrode, and the second electrode of the third switch tube is a drain electrode;

[0022] The first switch tube is an NMOS tube, the first electrode of the first switch tube is a source, the control electrode of the first switch tube is a gate, and the second electrode of the first switch tube is a drain.

[0023] Furthermore, the output disable control module further includes a third capacitor, wherein the third capacitor is connected in parallel with the fourth resistor.

[0024] Furthermore, the power amplifier module includes a sixth switch tube, a seventh switch tube, a sixth resistor and a seventh resistor, wherein the control electrode of the sixth switch tube and the control electrode of the seventh switch tube are both electrically connected to the input end of the power amplifier module; the first electrode of the sixth switch tube is electrically connected to the first power supply; the second electrode of the sixth switch tube is electrically connected to the output end of the power amplifier module via the sixth resistor; the first electrode of the seventh switch tube is electrically connected to the output end of the power amplifier module via the seventh resistor; and the second electrode of the seventh switch tube is electrically connected to the second power supply via the seventh resistor.

[0025] In a second aspect, an embodiment of the present invention further provides a motor controller, comprising: at least one bridge arm, and an upper bridge drive circuit and a lower bridge drive circuit corresponding to any bridge arm, wherein the lower bridge drive circuit comprises the drive circuit provided by any embodiment of the present invention,

[0026] Any bridge arm includes a first power switch tube and a second power switch tube, wherein the first pole of the first power switch tube is electrically connected to a DC power supply; the second pole of the first power switch tube and the first pole of the second power switch tube are both electrically connected to the power supply end of the motor; the second pole of the second power switch tube is grounded; the control pole of the first power switch tube is electrically connected to the corresponding upper bridge drive circuit; and the control pole of the second power switch tube is electrically connected to the corresponding drive circuit.

[0027] In the technical solution of the embodiment of the present invention, the driving circuit includes an active short-circuit control module, an output prohibition control module and a power amplification module, wherein the active short-circuit control module includes a first switch unit, and the first end of the first switch unit is electrically connected to the first power supply; the output prohibition control module includes a second switch unit, wherein the first end of the second switch unit is electrically connected to the pulse signal input end of the driving circuit; the control end of the second switch unit and the control end of the first switch unit are both electrically connected to the active short-circuit signal input end of the driving circuit; the second end of the second switch unit and the second end of the first switch unit are both electrically connected to the input end of the power amplification module; the output end of the power amplification module is electrically connected to the driving signal output end of the driving circuit, so as to realize that the motor enters the active short-circuit state from the normal state when a fault occurs in the motor controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a driving circuit provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of an application scenario of a driving circuit provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the structure of another driving circuit provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the structure of another driving circuit provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the structure of a motor controller provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] An embodiment of the present invention provides a driving circuit. Figure 1 The schematic diagram of the structure of a driving circuit provided by an embodiment of the present invention is as follows: the driving circuit 1 comprises: an active short circuit control module 10 , an output prohibition control module 20 and a power amplification module 30 .

[0035] Among them, the active short-circuit control module 10 includes a first switch unit 11, and the first end N1 of the first switch unit 11 is electrically connected to the first power supply 40; the output prohibition control module 20 includes a second switch unit 21, wherein the first end N3 of the second switch unit 21 is electrically connected to the pulse signal input end PWM of the drive circuit 1; the control end Ctr2 of the second switch unit 21 and the control end Ctr1 of the first switch unit 11 are both electrically connected to the active short-circuit signal input end ASC of the drive circuit 1; the second end N4 of the second switch unit 21 and the second end N2 of the first switch unit 11 are both electrically connected to the input end In1 of the power amplifier module 30; the output end Out1 of the power amplifier module 30 is electrically connected to the drive signal output end So of the drive circuit 1.

[0036] Among them, the first switch unit 11 may include at least one of the following: a bipolar junction transistor, a MOS transistor, and a relay. The second switch unit 21 may include at least one of the following: a bipolar junction transistor, a MOS transistor, and a relay. The drive circuit 1 may be arranged in a motor controller to drive the power switch tube to turn on or off. The pulse signal input terminal PWM may be used to receive a pulse width modulation signal. Optionally, when the motor controller is working normally, when the pulse signal input terminal PWM input is a first level, the drive signal output terminal So outputs a conduction signal to control the power switch tube to turn on; when the pulse signal input terminal PWM input is a second level logically opposite to the first level, the drive signal output terminal So outputs a shutdown signal to control the power switch tube to turn off. The first level may be a high level or a low level. The voltage of the first power supply 40 may be equal to the first level, so that when the motor controller fails, the voltage of the first power supply 40 is transmitted to the power amplifier module 30 through the turned-on first switch unit 11, so that the drive signal output terminal So outputs a conduction signal. The power amplifier module 30 plays a driving current amplification role, and the power amplifier module 30 may be a totem pole output structure, which can improve the driving capability. The first power source 40 may be a positive voltage source, and the voltage of the first power source 40 may be equal to the high level input by the pulse signal input terminal PWM. The active short-circuit signal may be high level effective or low level effective.

[0037] For example, taking the active short-circuit signal as being valid at a high level as an example, when the motor controller is operating normally, the active short-circuit signal input terminal ASC will not receive the active short-circuit signal, that is, the active short-circuit signal input terminal ASC is input at a low level, so that the first terminal N1 and the second terminal N2 of the first switch unit 11 are in an off state, and the first terminal N3 and the second terminal N4 of the second switch unit 21 are in an on state, so that the pulse width modulation signal input by the pulse signal input terminal PWM is transmitted to the power amplifier module to control the power switch tube to be turned on or off, so as to output the required voltage to the motor so that the motor can operate normally. When the motor controller fails, the active short-circuit signal input terminal ASC will receive the active short-circuit signal, that is, the active short-circuit signal input terminal ASC input is high level, so that the first terminal N1 and the second terminal N2 of the first switch unit 11 are in a conducting state, and when the pulse signal input terminal PWM input is the second level, the first terminal N3 and the second terminal N4 of the second switch unit 21 are in a shut-off state, so that the second switch unit 21 cannot transmit the second level corresponding to the shut-off signal to the power amplifier module, and the first switch unit 11 transmits the second level corresponding to the conduction signal to the power amplifier module, so that the power switch tube is turned on and the motor is short-circuited, that is, the output prohibition and active short-circuit function are realized. The active short-circuit signal can be a high level or a low level.

[0038] In the technical solution of this embodiment, the driving circuit includes an active short-circuit control module, an output prohibition control module and a power amplification module, wherein the active short-circuit control module includes a first switch unit, and the first end of the first switch unit is electrically connected to the first power supply; the output prohibition control module includes a second switch unit, wherein the first end of the second switch unit is electrically connected to the pulse signal input end of the driving circuit; the control end of the second switch unit and the control end of the first switch unit are both electrically connected to the active short-circuit signal input end of the driving circuit; the second end of the second switch unit and the second end of the first switch unit are both electrically connected to the input end of the power amplification module; the output end of the power amplification module is electrically connected to the driving signal output end of the driving circuit, so as to realize that the motor enters the active short-circuit state from the normal state when a fault occurs in the motor controller.

[0039] An embodiment of the present invention provides another driving circuit. Figure 2A schematic diagram of an application scenario of a driving circuit provided by an embodiment of the present invention. Based on the above embodiment, the second switch unit 21 includes a first switch tube T1 and a first diode D1, wherein the first pole of the first switch tube T1 and the first pole of the first diode D1 are both electrically connected to the first end N3 of the second switch unit 21; the second pole of the first switch tube T1 and the second pole of the first diode D1 are both electrically connected to the second end N4 of the second switch unit 21; the control pole of the first switch tube T1 is electrically connected to the control end Ctr2 of the second switch unit 21; the conduction direction of the first switch tube T1 is opposite to the conduction direction of the first diode D1.

[0040] The first switch tube may be a bipolar junction transistor or a MOS transistor, etc. Optionally, the first switch tube T1 is a MOS tube, and the first switch tube T1 is provided with a body diode, and the body diode serves as the first diode D1. Figure 2 The driving circuit 1 is shown as an example to be electrically connected to the control electrode of the second power switch tube Q2 as the lower bridge arm.

[0041] Exemplarily, when the motor controller is operating normally, the active short-circuit signal input terminal ASC will not be able to receive the active short-circuit signal, so that the first terminal N1 and the second terminal N2 of the first switch unit 11 are in an off state. If the pulse signal input terminal PWM inputs a first level, the first diode D1 is turned on and the first switch tube T1 is turned off, so that the first level input by the pulse signal input terminal PWM is transmitted to the power amplifier module 30 through the first diode D1, and then the on signal is output to the second power switch tube Q2; if the pulse signal input terminal PWM inputs a second level, the first diode D1 is turned off and the first switch tube T1 is turned on, so that the second level input by the pulse signal input terminal PWM is transmitted to the power amplifier module 30 through the first switch tube T1, and then the off signal is output to the second power switch tube Q2, so that the signal input by the pulse signal input terminal PWM can be normally transmitted to the power amplifier module to control the power switch tube to be turned on or off, so as to output the required voltage to the motor, so that the motor can operate normally.

[0042] When a fault occurs in the motor controller, the active short-circuit signal input terminal ASC will receive an active short-circuit signal, so that the first terminal N1 and the second terminal N2 of the first switch unit 11 are in an on state, the first switch tube T1 is turned off, and when the second level is input at the pulse signal input terminal PWM, the first diode D1 is turned off, so that the second level corresponding to the shutdown signal cannot be transmitted to the power amplifier module, and the first level corresponding to the conduction signal is transmitted to the power amplifier module 30 through the conducted first switch unit 11, so that the second power switch tube Q2 is turned on and the motor winding is short-circuited, that is, the output prohibition and active short-circuit functions are realized.

[0043] An embodiment of the present invention provides another driving circuit. Figure 3 A schematic diagram of the structure of another driving circuit provided by an embodiment of the present invention. Based on the above embodiment, the active short-circuit control module 10 further includes a first delay unit 12, wherein an input terminal In2 of the first delay unit 12 is electrically connected to an active short-circuit signal input terminal ASC of the driving circuit 1, and an output terminal Out2 of the first delay unit 12 is electrically connected to a control terminal Ctr1 of the first switch unit 11.

[0044] The voltage inputted by the input terminal In2 of the first delay unit 12 is delayed for the first time period and then outputted to its output terminal Out2. The first delay unit 12 can be used to gradually reach the voltage threshold of the first switch unit 11 after the first time period is delayed when the active short-circuit signal input terminal ASC receives the active short-circuit signal, thereby making the first terminal N1 and the second terminal N2 of the first switch unit 11 conductive, so that the output prohibition control module 20 first realizes the output prohibition, and then makes the active short-circuit control module 10 realize the active short-circuit function. The first delay unit 12 can be a resistor-capacitor delay circuit.

[0045] Optionally, based on the above embodiment, continue to refer to Figure 3 The output prohibition control module 20 further includes a second delay unit 22, wherein an input terminal In3 of the second delay unit 22 is electrically connected to the active short-circuit signal input terminal ASC of the driving circuit 1, and an output terminal Out3 of the second delay unit 22 is electrically connected to the control terminal Ctr2 of the second switch unit 21. The delay time t1 of the first delay unit 12 may be greater than the delay time t2 of the second delay unit 22.

[0046] Among them, the voltage inputted by the input terminal In3 of the second delay unit 22 is delayed for the second time period and then outputted to its output terminal Out3. The second delay unit 22 can be used to gradually reach the voltage threshold of the second switch unit 21 after the second time period is delayed when the active short-circuit signal input terminal ASC receives the active short-circuit signal, thereby making the first terminal N3 and the second terminal N4 of the second switch unit 21 act. Since the second time period t2 is less than the first time period t1, the output prohibition control module 20 first realizes the output prohibition, and then the active short-circuit control module 10 realizes the active short-circuit function. The second delay unit 22 can be a resistor-capacitor delay circuit.

[0047] Optionally, based on the above embodiment, Figure 4A structural schematic diagram of another driving circuit provided in an embodiment of the present invention, the driving circuit 1 also includes a second switch tube T2, wherein the control electrode of the second switch tube T2 is electrically connected to the active short-circuit signal input terminal ASC of the driving circuit 1; the input terminal of the first delay unit 12 and the input terminal of the second delay unit 22 are both electrically connected to the first electrode of the second switch tube T2; and the second electrode of the second switch tube T2 is grounded.

[0048] The second switch tube T2 may be a bipolar junction transistor or a MOS transistor. Optionally, the drive circuit 1 further includes an eighth resistor R8, and the active short-circuit signal input terminal ASC of the drive circuit 1 is electrically connected to the control electrode of the second switch tube T2 via the eighth resistor R8. The eighth resistor R8 has a current limiting function. By setting an intermediate circuit such as the second switch tube, the logical relationship and voltage level of the front and rear circuits are matched, so that the circuit can work reliably.

[0049] Optionally, based on the above embodiment, continue to refer to Figure 4 The first delay unit 12 includes a first resistor R1, a second resistor R2 and a first capacitor C1, wherein the input terminal In2 of the first delay unit 12 is electrically connected to the output terminal Out2 of the first delay unit 12 via the first resistor R1; the second resistor R2 and the first capacitor C1 are connected in parallel; the first end of the second resistor R2 and the first capacitor C1 connected in parallel is electrically connected to the output terminal Out1 of the first delay unit 12; the second end of the second resistor R2 and the first capacitor C1 connected in parallel is electrically connected to the first end N1 of the first switch unit 11.

[0050] Among them, the delay time of the first delay unit 12 is Wherein, V1 is the voltage of the first power supply 40, V th1 is the threshold voltage for the first switch unit 11 to be turned on. By adjusting the first resistor R1, the second resistor R2 and the first capacitor C1, the delay time t1 of the driver stage entering the active short circuit state when ASC is effective (the active short circuit ASC control signal can be high level effective) can be flexibly adjusted.

[0051] Optionally, based on the above embodiment, Figure 3 and Figure 4 As shown, the first switch unit 11 includes a third switch tube T3, wherein a first electrode of the third switch tube T3 is electrically connected to a first end N1 of the first switch unit 11; a control electrode of the third switch tube T3 is electrically connected to a control end Ctr1 of the first switch unit 11; a second electrode of the third switch tube T3 is electrically connected to a second end N2 of the first switch unit 11; and a junction capacitance between the control electrode and the first electrode of the third switch tube T3 serves as a first capacitor C1.

[0052] The third switch tube T3 may be a bipolar junction transistor or a MOS transistor. The third switch tube T3 may be a MOS transistor provided with a body diode. Figure 4 The third switch tube T3 is a PMOS tube, the first electrode of the third switch tube T3 is a source electrode, the control electrode of the third switch tube T3 is a gate electrode, and the second electrode of the third switch tube T3 is a drain electrode.

[0053] Optionally, based on the above embodiment, continue to refer to Figure 4 The output prohibition control module 20 also includes: a level conversion unit, the level conversion unit includes a fourth switch tube T4, a third resistor R3 and a fifth switch tube T5, wherein the control electrode of the fourth switch tube T4 is electrically connected to the first electrode of the second switch tube T2; the first electrode of the fourth switch tube T4 is electrically connected to the first power supply 40; the second electrode of the fourth switch tube T4 is grounded via the third resistor R3; the second electrode of the fourth switch tube T4 is electrically connected to the control electrode of the fifth switch tube T5; the first electrode of the fifth switch tube T5 is electrically connected to the input end In3 of the second delay unit 22; and the second electrode of the fifth switch tube T5 is electrically connected to the first power supply 40.

[0054] The fourth switch tube T4 may be a bipolar junction transistor or a MOS transistor. The fifth switch tube T5 may be a bipolar junction transistor or a MOS transistor. It should be noted that nodes with the same mark are electrically connected, such as the node VCC. The fifth switch tube T5 may be a MOS transistor provided with a body diode. By providing an intermediate circuit such as a level conversion unit, the logical relationship and voltage level of the front and rear circuits are matched, so that the circuit can work reliably.

[0055] Optionally, based on the above embodiment, continue to refer to Figure 4 The level conversion unit further includes a ninth resistor R9, and the control electrode of the fourth switch tube T4 is electrically connected to the first electrode of the second switch tube T2 via the ninth resistor R9. The ninth resistor R9 has a current limiting function.

[0056] Optionally, based on the above embodiment, continue to refer to Figure 4 The level conversion unit also includes a tenth resistor R10 and an eleventh resistor R11. The second electrode of the fourth switch tube T4 is electrically connected to the control electrode of the fifth switch tube T5 via the tenth resistor R10; the control electrode of the fifth switch tube T5 is electrically connected to the second electrode of the fifth switch tube T5 via the eleventh resistor R11.

[0057] Optionally, based on the above embodiment, continue to refer to Figure 4The second delay unit 22 includes: a fourth resistor R4, a fifth resistor R5 and a second capacitor C2, wherein the input end of the second delay unit 22 is electrically connected to the output end Out3 of the second delay unit 22 via the fourth resistor R4; the fifth resistor R5 is connected in parallel with the second capacitor C2; the first end of the fifth resistor R5 and the second capacitor C2 after being connected in parallel is electrically connected to the output end Out3 of the second delay unit 22; the second end of the fifth resistor and the second capacitor after being connected in parallel is electrically connected to the first end of the second switch unit.

[0058] Among them, the delay time of the second delay unit 22 is Among them, V2 is the low level of the pulse signal input terminal PWM input, V th2 is the threshold voltage for turning off the second switch unit 21. By adjusting the fourth resistor R4, the fifth resistor R5 and the second capacitor C2, the delay time t2 for the driver stage to enter the output stage disable state when the ASC signal is valid can be flexibly adjusted, thereby meeting the control timing requirements of the active short circuit ASC function and the output disable OSD function.

[0059] Optionally, based on the above embodiment, Figure 3 and Figure 4 As shown, the second switch unit includes a first switch tube T1, wherein the first electrode of the first switch tube T1 is electrically connected to the first end N1 of the second switch unit 21; the control electrode of the first switch tube T1 is electrically connected to the control end Ctr2 of the second switch unit 21; the second electrode of the first switch tube T1 is electrically connected to the second end N4 of the second switch unit 21; and the junction capacitance between the control electrode and the first electrode of the first switch tube T1 serves as the second capacitor C2.

[0060] Optionally, based on the above embodiment, continue to refer to Figure 4 The first switch tube T1 is an NMOS tube, the first electrode of the first switch tube T1 is a source, the control electrode of the first switch tube T1 is a gate, and the second electrode of the first switch tube T1 is a drain.

[0061] Optionally, based on the above embodiment, continue to refer to Figure 4 The output disable control module 20 further includes a third capacitor C3, wherein the third capacitor C3 is connected in parallel with the fourth resistor R4.

[0062] Optionally, based on the above embodiment, continue to refer to Figure 2The power amplifier module includes a sixth switch tube T6, a seventh switch tube T7, a sixth resistor R6 and a seventh resistor R7, wherein the control electrode of the sixth switch tube T6 and the control electrode of the seventh switch tube T7 are both electrically connected to the input terminal In1 of the power amplifier module 30; the first electrode of the sixth switch tube T6 is electrically connected to the first power supply 40; the second electrode of the sixth switch tube T6 is electrically connected to the output terminal Out1 of the power amplifier module 30 via the sixth resistor R6; the first electrode of the seventh switch tube T7 is electrically connected to the output terminal Out1 of the power amplifier module 30 via the seventh resistor R7; the second electrode of the seventh switch tube T7 is electrically connected to the second power supply 50 via the seventh resistor R7.

[0063] The sixth switch tube R6 may be a bipolar junction transistor or a MOS transistor. The seventh switch tube T7 may be a bipolar junction transistor or a MOS transistor. The second power supply 50 may be a negative voltage source, and the voltage of the second power supply 50 may be equal to the low level input by the pulse signal input terminal PWM. Figure 2 The sixth switch tube R6 is an NPN transistor and the seventh switch tube T7 is a PNP transistor. Figure 2 As shown, if the input terminal In1 of the power amplifier module 30 is at a high level, the sixth switch tube R6 will be turned on, the seventh switch tube T7 will be turned off, and the output terminal Out1 of the power amplifier module 30 will output a high level; if the input terminal In1 of the power amplifier module 30 is at a low level, the sixth switch tube R6 will be turned off, the seventh switch tube T7 will be turned on, and the output terminal Out1 of the power amplifier module 30 will output a low level.

[0064] Optionally, based on the above embodiment, continue to refer to Figure 4 The driving circuit also includes a twelfth resistor R12, a second end of the first switch unit 11, and a second end of the second switch unit 21, which are all electrically connected to the first end of the twelfth resistor R12; the second end of the twelfth resistor R12 is electrically connected to the input end In1 of the power amplifier module 30.

[0065] Optionally, based on the above embodiment, continue to refer to Figure 4 The driving circuit further includes a first isolator and a second isolator, the pulse signal input terminal PWM is electrically connected to the first end of the second switch unit 21 via the first isolator; the active short-circuit signal input terminal ASC is electrically connected to the first end of the eighth resistor R8 via the second isolator, and the second end of the eighth resistor R8 is electrically connected to the control electrode of the second switch tube T2. The first isolator and the second isolator can be optocoupler isolators, etc.

[0066] Combination Figure 3 and Figure 4As shown, during normal operation, the input terminal of the second isolator is at a low level, so the output of the second isolator is at a low level, the second switch tube T2 and the fourth switch tube T4 are turned off, so the fifth switch tube T5 is in a forward biased conduction state, and the first power supply 40 is loaded onto the fourth resistor R4 and the third capacitor C3 through the fifth switch tube T5, and the output of the first isolator is controlled by the low-voltage side pulse signal input terminal PWM. When the pulse signal input terminal PWM is at a high level, the output of the first isolator is pulled up to VC (which may be equal to the voltage of the first power supply), typically +15V. When the pulse signal input terminal PWM is at a low level, the output of the first isolator is pulled down to VE (which may be equal to the voltage of the second power supply), typically -8V, so the first switch tube T1 works in a switching state. When the output of the first isolator is equal to VC, the first switch tube T1 is turned off, and the high-level signal enters the subsequent drive current amplifier circuit through the body diode D1 of the first switch tube T1. When the output of the first isolator is equal to VE, the first switch tube T1 is turned on, and a high-pass filter circuit is formed by the fourth resistor R4, the third capacitor C3, and the fifth resistor R5 and the gate (also called the gate) equivalent input capacitor C2 of the first switch tube T1, providing a steep opening rising edge for the first switch tube T1, accelerating the opening speed of the first switch tube T1, and then entering the subsequent power amplifier module 30 through the first switch tube T1.

[0067] When a fault occurs in the motor controller, the control signal of the active short-circuit signal input terminal ASC is pulled high, so the second isolator outputs a high level, the second switch tube T2 and the fourth switch tube T4 are saturated and turned on, the fifth switch tube T5 is turned off, the fourth resistor R4 and the third capacitor C3 are disconnected from the node VCC, and the gate equivalent input capacitance of the first switch tube T1 is discharged through the fifth resistor R5, so that the first switch tube T1 is disconnected, thereby cutting off the connection between the first isolator and the drive current amplifier circuit composed of the sixth switch tube T6 and the seventh switch tube T7, and replacing the OSD pin through the dedicated driver chip to enter the Output StageDisable state.

[0068] When the motor controller fails, the control signal of the active short circuit signal input terminal ASC is pulled high, so the second isolator outputs a high level, and the second switch tube T2 is saturated and turned on. Therefore, the second switch tube T3 charges the gate equivalent input capacitor C1 of the second switch tube T3 through the first resistor R1 and the second resistor R2, so that the second switch tube T3 is turned on, replacing the ASC pin of the dedicated driver chip to enter the Active Short Circuit state. It should be noted that the delay time t1 of entering the active short circuit state is longer than the delay time t2 of entering the output disabled state, so as to ensure that when the latter stage is high, the former stage is already in a three-state state, preventing the current from flowing back to the first isolator.

[0069] An embodiment of the present invention provides a motor controller. Figure 5 A schematic diagram of the structure of a motor controller provided in an embodiment of the present invention. The motor controller comprises: at least one bridge arm 2, and an upper bridge drive circuit 3 and a lower bridge drive circuit corresponding to any bridge arm 2, wherein the lower bridge drive circuit comprises the drive circuit 1 provided in any embodiment of the present invention.

[0070] Among them, any bridge arm 2 includes a first power switch tube Q1 and a second power switch tube Q2, wherein the first pole of the first power switch tube Q1 is electrically connected to the DC power supply 4; the second pole of the first power switch tube Q1 and the first pole of the second power switch tube Q2 are both electrically connected to the power supply end of the motor 5; the second pole of the second power switch tube Q2 is grounded; the control pole of the first power switch tube Q1 is electrically connected to the corresponding upper bridge drive circuit 3; the control pole of the second power switch tube Q2 is electrically connected to the corresponding drive circuit 1.

[0071] The motor 5 may be a DC motor or an AC motor. Figure 5 The motor is drawn as a three-phase AC motor. The first power switch tube Q1 and the second power switch tube Q2 can be a metal oxide semiconductor field effect tube (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) or an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT). When the motor controller has an IGBT short circuit fault, a driving power supply voltage overvoltage, undervoltage, a phase current overcurrent, a bus voltage overvoltage and other faults, the upper bridge drive circuit 3 outputs a shutdown signal to the first power switch tube Q1 as the upper bridge arm to turn off the first power switch tube Q1; after the drive circuit 1 receives the active short circuit signal and enters the active short circuit state, it outputs a conduction signal to the second power switch tube Q2 as the lower bridge arm to short-circuit the motor winding, prevent the electric energy from flowing to the DC bus side, and generate high voltage to damage the bus capacitor and power switch and other devices. The motor controller provided in the embodiment of the present invention includes the drive circuit in the above embodiment, so the motor controller provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be repeated here.

[0072] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A driving circuit, characterized in that: include: An active short circuit control module comprises a first switch unit, wherein a first end of the first switch unit is electrically connected to a first power source; The output disable control module comprises a second switch unit, wherein a first end of the second switch unit is electrically connected to a pulse signal input end of the drive circuit; a control end of the second switch unit and a control end of the first switch unit are both electrically connected to an active short-circuit signal input end of the drive circuit; A power amplification module, a second end of the second switch unit, and a second end of the first switch unit are electrically connected to an input end of the power amplification module; an output end of the power amplification module is electrically connected to a drive signal output end of the drive circuit; The active short-circuit control module further includes a first delay unit, wherein an input end of the first delay unit is electrically connected to an active short-circuit signal input end of the drive circuit, and an output end of the first delay unit is electrically connected to a control end of the first switch unit; The output prohibition control module further includes a second delay unit, wherein an input end of the second delay unit is electrically connected to an active short-circuit signal input end of the drive circuit, and an output end of the second delay unit is electrically connected to a control end of the second switch unit; The delay time of the first delay unit is greater than the delay time of the second delay unit; The first delay unit includes a first resistor, a second resistor and a first capacitor, wherein the input end of the first delay unit is electrically connected to the output end of the first delay unit via the first resistor; the second resistor and the first capacitor are connected in parallel; the first end of the second resistor and the first capacitor connected in parallel is electrically connected to the output end of the first delay unit; the second end of the second resistor and the first capacitor connected in parallel is electrically connected to the first end of the first switch unit; The second switch unit includes a first switch tube and a first diode, wherein the first electrode of the first switch tube and the first electrode of the first diode are both electrically connected to the first end of the second switch unit; the second electrode of the first switch tube and the second electrode of the first diode are both electrically connected to the second end of the second switch unit; the control electrode of the first switch tube is electrically connected to the control end of the second switch unit; The conduction direction of the first switch tube is opposite to the conduction direction of the first diode.

2. The driving circuit according to claim 1, characterized in that: The first switch tube is a MOS tube, and the first switch tube is provided with a body diode, and the body diode serves as the first diode.

3. The driving circuit according to claim 1, characterized in that: The driving circuit further comprises a second switch tube, wherein the control electrode of the second switch tube is electrically connected to the active short-circuit signal input terminal of the driving circuit; the input terminal of the first delay unit and the input terminal of the second delay unit are both electrically connected to the first electrode of the second switch tube; and the second electrode of the second switch tube is grounded; The first switch unit includes a third switch tube, wherein a first electrode of the third switch tube is electrically connected to a first end of the first switch unit; a control electrode of the third switch tube is electrically connected to a control end of the first switch unit; a second electrode of the third switch tube is electrically connected to a second end of the first switch unit; and a junction capacitance between the control electrode and the first electrode of the third switch tube serves as the first capacitance.

4. The driving circuit according to claim 3, characterized in that: The output disable control module further includes: a level conversion unit, the level conversion unit including a fourth switch tube, a third resistor and a fifth switch tube, wherein the control electrode of the fourth switch tube is electrically connected to the first electrode of the second switch tube; the first electrode of the fourth switch tube is electrically connected to the first power supply; the second electrode of the fourth switch tube is grounded via the third resistor; the second electrode of the fourth switch tube is electrically connected to the control electrode of the fifth switch tube; the first electrode of the fifth switch tube is electrically connected to the input end of the second delay unit; and the second electrode of the fifth switch tube is electrically connected to the first power supply; The second delay unit includes: a fourth resistor, a fifth resistor and a second capacitor, wherein the input end of the second delay unit is electrically connected to the output end of the second delay unit via the fourth resistor; the fifth resistor and the second capacitor are connected in parallel; the first end of the fifth resistor and the second capacitor connected in parallel is electrically connected to the output end of the second delay unit; the second end of the fifth resistor and the second capacitor connected in parallel is electrically connected to the first end of the second switch unit; The second switch unit includes a first switch tube, wherein the first electrode of the first switch tube is electrically connected to the first end of the second switch unit; the control electrode of the first switch tube is electrically connected to the control end of the second switch unit; the second electrode of the first switch tube is electrically connected to the second end of the second switch unit; and the junction capacitance between the control electrode and the first electrode of the first switch tube serves as the second capacitance.

5. The driving circuit according to claim 4, characterized in that: The third switch tube is a PMOS tube, the first electrode of the third switch tube is a source electrode, the control electrode of the third switch tube is a gate electrode, and the second electrode of the third switch tube is a drain electrode; The first switch tube is an NMOS tube, the first electrode of the first switch tube is a source, the control electrode of the first switch tube is a gate, and the second electrode of the first switch tube is a drain.

6. The driving circuit according to claim 4, characterized in that: The output disable control module further includes a third capacitor, wherein the third capacitor is connected in parallel with the fourth resistor.

7. The driving circuit according to claim 1, characterized in that: The power amplifier module includes a sixth switch tube, a seventh switch tube, a sixth resistor and a seventh resistor, wherein the control electrode of the sixth switch tube and the control electrode of the seventh switch tube are both electrically connected to the input end of the power amplifier module; the first electrode of the sixth switch tube is electrically connected to the first power supply; the second electrode of the sixth switch tube is electrically connected to the output end of the power amplifier module via the sixth resistor; the first electrode of the seventh switch tube is electrically connected to the output end of the power amplifier module via the seventh resistor; and the second electrode of the seventh switch tube is electrically connected to the second power supply.

8. A motor controller, characterized in that: include: at least one bridge arm, and an upper bridge driving circuit and a lower bridge driving circuit corresponding to any of the bridge arms, wherein the lower bridge driving circuit comprises a driving circuit as claimed in any one of claims 1 to 7, Any of the bridge arms includes a first power switch tube and a second power switch tube, wherein the first pole of the first power switch tube is electrically connected to a DC power supply; the second pole of the first power switch tube and the first pole of the second power switch tube are both electrically connected to the power supply end of the motor; the second pole of the second power switch tube is grounded; the control pole of the first power switch tube is electrically connected to the corresponding upper bridge drive circuit; and the control pole of the second power switch tube is electrically connected to the corresponding drive circuit.

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