Driving circuit and electronic equipment

Abstract

The invention discloses a driving circuit and electronic equipment. The driving circuit comprises a main driving module and an auxiliary driving module. Wherein the main driving module comprises a main control module, a voltage conversion module and an inversion module; the auxiliary driving module comprises an oscillation module. Through the mode, when the main control module cannot normally output the PWM control signal, the auxiliary driving module is switched to output the second PWM control signal through the oscillation module, so that the voltage conversion module continuously outputs the positive and negative voltage control signal and the second control signal, and a lower three-bridge power switch assembly in the inversion module is controlled to be switched on so as to enter an ASC mode; therefore, the stability, flexibility and reliability of the system are improved.

Description

Technical Field

[0001] The present application relates to the field of electronic circuits, and in particular to drive circuits and electronic equipment. Background Art

[0002] In new energy vehicles using permanent magnet synchronous motors, the drive module plays a crucial role, ensuring accurate and stable power transmission throughout the entire system. Traditional drive modules rely on a main control module, such as an MCU (Microcontroller Unit), to generate PWM (Pulse Width Modulation) signals to control the switching transistors in the forward or flyback modules, converting low-voltage electricity into the positive and negative voltages required by the drive module.

[0003] In actual applications, PWM signal generation can be affected by static electricity striking the main control chip during high-speed operation, or by electromagnetic interference causing software failure. Furthermore, the main control chip may also fail to generate PWM signals due to manufacturing defects, aging, or other inherent faults. Abnormal PWM signals prevent the switches from turning on and off according to the normal timing, affecting the energy conversion process in the forward or flyback circuits. Furthermore, to protect the safety of the circuits and equipment, the upper and lower drive bridge arms in the motor inverter will quickly lock into a low output voltage, causing the entire drive system to cease operation, thus affecting the accuracy and stability of the system's power transmission. Summary of the Invention

[0004] To solve the above problems, the present application provides a driving circuit and an electronic device that can switch to a backup control path to output the signal when the main control module cannot output the PWM signal normally, so that the forward or flyback module can continuously output positive and negative voltages, and control the conduction of the lower three-bridge power switch components in the inverter module to enter the ASC mode, maintain stable operation of the system, and thus improve system stability, flexibility and reliability.

[0005] A technical solution adopted in the present application is: providing a drive circuit, which includes: a main drive module, the main drive module includes: a main control module, the main control module is configured to output a first PWM control signal; two voltage conversion modules, connected to the main control module, each voltage conversion module is configured to output a first control signal and a second control signal based on the first PWM control signal; wherein the first control signal is a high level and the second control signal is a low level; an inverter module, including an upper three-bridge power switch component and a lower three-bridge power switch component, the two voltage conversion modules are respectively connected to the upper three-bridge power switch component and the lower three-bridge power switch component, and the inverter module is configured to control the motor based on the first control signal and the second control signal when connected to the motor; an auxiliary drive module, the auxiliary drive module includes: an oscillation module, the oscillation module is coupled to the voltage conversion module connected to the lower three-bridge power switch component, and is configured to output a second PWM control signal to the voltage conversion module when the main control module fails to output the first PWM control signal, so that the voltage conversion module continues to output the first control signal and the second control signal.

[0006] In one embodiment, the oscillation module includes: a wave-generating unit connected to a first power supply, the wave-generating unit outputting a self-excited oscillation signal after being powered by the first power supply; a comparison unit connected to the wave-generating unit, the first power supply and the voltage conversion module, the comparison unit being configured to output a second PWM control signal based on the self-excited oscillation signal.

[0007] In one embodiment, the wave-generating unit includes: a first operational amplifier, wherein a first input terminal of the first operational amplifier is connected to an output terminal of the wave-generating unit, a second input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier through a first resistor, a first power supply terminal of the first operational amplifier is connected to a first power supply, and a second power supply terminal of the first operational amplifier is grounded; a first capacitor, wherein a first end of the first capacitor is connected to the first input terminal of the first operational amplifier, and a second end of the first capacitor is grounded; a second resistor, wherein a first end of the second resistor is connected to the output terminal of the wave-generating unit, and a second end of the second resistor is connected to the output terminal of the first operational amplifier; a third resistor, wherein a first end of the third resistor is connected to the second power supply terminal of the first operational amplifier, and a second end of the third resistor is connected to the second input terminal of the first operational amplifier; a fourth resistor, wherein a first end of the fourth resistor is connected to the second input terminal of the first operational amplifier, and a second end of the fourth resistor is connected to the first power supply; a second capacitor, wherein a first end of the second capacitor is grounded, and a second end of the second capacitor is connected to the second end of the fourth resistor; and a fifth resistor, wherein a first end of the fifth resistor is connected to the first power supply, and a second end of the fifth resistor is connected to the output terminal of the first operational amplifier.

[0008] In one embodiment, the comparison unit includes: a sixth resistor, a first end of the sixth resistor is connected to the output end of the wave-generating unit; a seventh resistor, a first end of the seventh resistor is connected to the first power supply; an eighth resistor, a first end of the eighth resistor is connected to the second end of the seventh resistor, and the second end of the eighth resistor is grounded; a second operational amplifier, a first input end of the second operational amplifier is connected to the second end of the sixth resistor, and the second input end of the second operational amplifier is connected to the first end of the eighth resistor; a ninth resistor, a first end of the ninth resistor is connected to the output end of the second operational amplifier, and the second end of the ninth resistor is connected to the voltage conversion module; a tenth resistor, a first end of the tenth resistor is connected to the first end of the seventh resistor, and the second end of the tenth resistor is connected to the output end of the second operational amplifier; a first diode, a cathode of the first diode is connected to the first power supply, and an anode of the first diode is connected to the second end of the seventh resistor; and a third capacitor, the third capacitor is connected in parallel with the eighth resistor.

[0009] In one embodiment, the voltage conversion module includes: a control unit connected to the main control module and the oscillation module; a transformer unit connected to the control unit, the second power supply and the inverter module; wherein the control unit is configured to control the transformer unit to output the first control signal and the second control signal based on the first PWM control signal or the second PWM control signal.

[0010] In one embodiment, the control unit includes: an eleventh resistor, wherein the first end of the eleventh resistor is connected to the main control module and the oscillation module; a control switch, wherein the first end of the control switch is connected to the transformer unit, the second end of the control switch is grounded, and the control end of the control switch is connected to the second end of the eleventh resistor; a twelfth resistor, wherein the first end of the twelfth resistor is connected to the control end of the control switch, and the second end of the twelfth resistor is connected to the second end of the control switch; a thirteenth resistor, wherein the first end of the thirteenth resistor is connected to the second end of the control switch; and a fourth capacitor, wherein the first end of the fourth capacitor is connected to the second end of the thirteenth resistor, and the second end of the fourth capacitor is connected to the transformer unit.

[0011] In one embodiment, the transformer unit includes: a second diode, the anode of the second diode is grounded; a transformer, the first end of the primary side of the transformer is connected to the cathode of the second diode, the second end of the primary side of the transformer is connected to the second power supply, and the third end of the primary side of the transformer is connected to the control unit; a third diode, the anode of the third diode is connected to the first end of the secondary side of the transformer; a fifth capacitor, the first end of the fifth capacitor is connected to the cathode of the third diode, and the second end of the fifth capacitor is connected to the second end of the secondary side of the transformer; a fourth diode, the cathode of the fourth diode is connected to the third end of the secondary side of the transformer; a sixth capacitor, the first end of the sixth capacitor is connected to the second end of the secondary side of the transformer, and the second end of the sixth capacitor is connected to the anode of the fourth diode; a fourteenth resistor, the first end of the fourteenth resistor is connected to the second end of the sixth capacitor, and the second end of the fourteenth resistor is connected to the inverter module.

[0012] In one embodiment, the voltage transformation unit also includes: a fifteenth resistor, the first end of the fifteenth resistor is connected to the cathode of the third diode; a voltage stabilizing chip, the input end of the voltage stabilizing chip is connected to the cathode of the third diode, the enable end of the voltage stabilizing chip is connected to the second end of the fifteenth resistor, and the output end of the voltage stabilizing chip is connected to the inverter module; a sixteenth resistor, the first end of the sixteenth resistor is connected to the feedback end of the voltage stabilizing chip, and the second end of the sixteenth resistor is connected to the output end of the voltage stabilizing chip; a seventeenth resistor, the first end of the seventeenth resistor is connected to the feedback end of the voltage stabilizing chip, and the second end of the seventeenth resistor is connected to the second end of the secondary side of the transformer; a seventh capacitor, the first end of the seventh capacitor is connected to the feedback end of the voltage stabilizing chip, and the second end of the seventh capacitor is connected to the output end of the voltage stabilizing chip; an eighth capacitor, the first end of the eighth capacitor is connected to the output end of the voltage stabilizing chip, and the second end of the eighth capacitor is connected to the second end of the secondary side of the transformer; a ninth capacitor, the first end of the ninth capacitor is connected to the output end of the voltage stabilizing chip, and the second end of the ninth capacitor is connected to the first end of the sixth capacitor.

[0013] In one embodiment, when the main control module fails to output the first PWM control signal and the upper three-bridge power switch components are turned off, the oscillation module outputs the second PWM control signal to the voltage conversion module, so that the voltage conversion module outputs the first control signal to control the lower three-bridge power switch components to turn on.

[0014] The present application also provides an electronic device, which includes the driving circuit as described above.

[0015] A technical solution adopted in the present application is: to provide a drive circuit, which includes: a main drive module, the main drive module includes: a main control module, the main control module is configured to output a first PWM control signal; two voltage conversion modules, connected to the main control module, each voltage conversion module is configured to output a first control signal and a second control signal based on the first PWM control signal; wherein the first control signal is a high level and the second control signal is a low level; an inverter module, including an upper three-bridge power switch component and a lower three-bridge power switch component, the two voltage conversion modules are respectively connected to the upper three-bridge power switch component and the lower three-bridge power switch component, and the inverter module is configured to control the motor based on the first control signal and the second control signal when connected to the motor; an auxiliary drive module, the auxiliary drive module includes: an oscillation module, the oscillation module is coupled to the voltage conversion module connected to the lower three-bridge power switch component, and is configured to output a second PWM control signal to the voltage conversion module when the main control module fails to output the first PWM control signal, so that the voltage conversion module continues to output the first control signal and the second control signal. Through the above method, when the main control module cannot normally output the first PWM control signal, it can switch to the auxiliary drive module to output the second PWM control signal through the oscillation module, so that the voltage conversion module continuously outputs the first control signal and the second control signal of positive and negative voltages, and controls the lower three-bridge power switch components in the inverter module to be turned on, so as to enter the ASC mode and maintain stable operation of the system, thereby improving the system stability, flexibility and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them: Figure 1 is a structural diagram of the first embodiment of the driving circuit provided by this application; Figure 2 is a structural diagram of a second embodiment of a driving circuit provided by this application; Figure 3 is a schematic structural diagram of a third embodiment of a driving circuit provided by the present application; Figure 4 It is a structural diagram of an embodiment of an electronic device provided by this application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] The terms "first," "second," and the like in this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0019] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] See Figure 1 , Figure 1 1 is a schematic structural diagram of a first embodiment of a driving circuit provided in the present application. The driving circuit 100 includes a main driving module 10 and an auxiliary driving module 20 .

[0021] The main drive module 10 includes a main control module 11, two voltage conversion modules 12, and an inverter module 13. The main control module 11 is configured to output a first PWM control signal; the two voltage conversion modules 12 are connected to the main control module 11 and are configured to output a first control signal and a second control signal based on the first PWM control signal; wherein the first control signal is a high level and the second control signal is a low level; the inverter module 13 includes an upper three-bridge power switch component 131 and a lower three-bridge power switch component 132. The two voltage conversion modules 12 are respectively connected to the upper three-bridge power switch component 131 and the lower three-bridge power switch component 132. When connected to the motor, the inverter module 13 is configured to control the motor based on the first control signal and the second control signal.

[0022] The auxiliary drive module 20 includes an oscillator module 21. The oscillator module 21 is coupled to the voltage conversion module 12 connected to the lower three-bridge power switch assembly 132 and is configured to output a second PWM control signal to the voltage conversion module 12 when the main control module 11 fails to output the first PWM control signal, so that the voltage conversion module 12 continues to output the first control signal and the second control signal.

[0023] Specifically, the main control module 11 can be an MCU. During the generation of the first PWM control signal, the MCU first sets the frequency and duty cycle parameters of the first PWM control signal based on system requirements. These parameters can be flexibly adjusted through software programming to meet the control requirements of different application scenarios. The MCU configures these parameters into the timer / counter module. The timer / counter begins operating according to the set parameters, generates the corresponding waveform of the first PWM control signal, and transmits it through a specific output pin, thereby controlling the output of the voltage conversion module 12.

[0024] The voltage conversion module 12 is an important component for achieving voltage conversion in an electronic system. It typically includes a switching component, a transformer component, and an energy storage component. It is used to convert the input power supply voltage into the positive voltage (first control signal) and negative voltage (second control signal) required by the inverter module 13. Specifically, the voltage conversion module 12 operates based on a PWM control signal (such as a first PWM control signal). Upon receiving the PWM control signal, the switching component (such as a MOSFET) in the voltage conversion module 12 will rapidly turn on and off according to the duty cycle of the PWM control signal, causing the transformer component to convert the power supply voltage (such as boosting). When the switching component is on, the energy storage component stores energy; when the switching component is off, the energy storage component releases energy and transfers the energy to the output terminal through auxiliary components such as diodes, thereby forming the required output voltage.

[0025] In one embodiment, by precisely controlling the duty cycle of the PWM control signal, the average value of the output voltage of the voltage conversion module 12 can be adjusted, thereby achieving precise control of the first control signal and the second control signal, thereby achieving control of the inverter module 13.

[0026] Specifically, the inverter module 13 typically comprises multiple power transistors (such as IGBTs or MOSFETs) in a full-bridge or half-bridge circuit configuration. These power transistors function as switches within the circuit. By controlling their on and off states, they can convert the input DC voltage into an AC voltage output with a specific frequency and amplitude. Positive and negative voltages (first and second control signals) control the switching of the power transistors within the inverter module 13, ensuring they can reliably turn on and off within an appropriate voltage range. The stability of the first and second control signals also directly impacts the proper operation of the power transistors and the quality of the output waveform from the inverter module 13.

[0027] For example, in a motor drive system, the frequency and amplitude of the AC voltage output by the inverter module 13 need to be precisely controlled to achieve precise regulation of the motor speed and torque, and the stable output of the first control signal and the second control signal is the basis for ensuring the normal operation of the inverter module 13 to achieve motor control.

[0028] In one embodiment, when the MCU fails to normally issue the first PWM control signal due to software failure or chip damage, the oscillation module 21 in the auxiliary drive module 20 outputs the second PWM control signal, which can ensure the normal output of the first control signal and the second control signal, thereby ensuring that the lower three-bridge power switch component 132 in the inverter module 13 can be turned on normally to enter the ASC mode.

[0029] See Figure 2 , Figure 2 1 is a schematic structural diagram of a second embodiment of a driving circuit provided in the present application. The driving circuit 100 includes a main driving module 10 and an auxiliary driving module 20 .

[0030] The main drive module 10 includes a main control module 11, two voltage conversion modules 12, and an inverter module 13. The main control module 11 is configured to output a first PWM control signal; the two voltage conversion modules 12 are connected to the main control module 11 and are configured to output a first control signal and a second control signal based on the first PWM control signal; wherein the first control signal is a high level and the second control signal is a low level; the inverter module 13 includes an upper three-bridge power switch component 131 and a lower three-bridge power switch component 132. The two voltage conversion modules 12 are respectively connected to the upper three-bridge power switch component 131 and the lower three-bridge power switch component 132. When connected to the motor, the inverter module 13 is configured to control the motor based on the first control signal and the second control signal.

[0031] The auxiliary drive module 20 includes an oscillator module 21. The oscillator module 21 is coupled to the voltage conversion module 12 connected to the lower three-bridge power switch assembly 132 and is configured to output a second PWM control signal to the voltage conversion module 12 when the main control module 11 fails to output the first PWM control signal, so that the voltage conversion module 12 continues to output the first control signal and the second control signal.

[0032] In some embodiments, the oscillation module 21 includes a wave generating unit 211 and a comparison unit 212. The wave generating unit 211 is connected to the first power supply and outputs a self-oscillation signal after being powered on by the first power supply. The comparison unit 212 is connected to the wave generating unit 211, the first power supply, and the voltage conversion module 12 and is configured to output a second PWM control signal based on the self-oscillation signal.

[0033] After being powered on, the oscillating unit 211 can generate a self-oscillating signal without any external input excitation signal. The comparing unit 212 compares and analyzes the self-oscillating signal generated by the oscillating unit 211 with a reference signal to generate and control the second PWM control signal.

[0034] Specifically, the wave generating unit 211 is composed of an amplifier circuit, a positive and negative feedback circuit, and other components. The amplifier circuit provides gain for signal amplification, and the positive and negative feedback circuit is used to achieve self-oscillation. It feeds a portion of the signal output by the amplifier circuit back to the input terminal, causing a voltage difference at the input terminal, causing the output signal to change, thereby forming a continuous oscillation process and emitting a self-oscillation signal. The comparison unit 212 typically includes a high-precision comparator, one input of which receives the self-oscillation signal, and the other input receives a reference signal set by an external circuit or internally. The amplitude and characteristics of the reference signal can be flexibly adjusted according to actual needs. For example, it can be a constant DC voltage signal for comparison with the instantaneous amplitude of the self-oscillation signal, or it can be a signal with a specific waveform and frequency to achieve more complex second PWM control signal modulation.

[0035] When a self-oscillation signal is input to one of the comparator's inputs, the comparator monitors its amplitude in real time and compares it with a reference signal. If the amplitude of the self-oscillation signal is higher than the reference signal, the comparator outputs a high-level signal. Conversely, if the amplitude of the self-oscillation signal is lower than the reference signal, the comparator outputs a low-level signal. Through this continuous comparison and judgment process, comparison unit 212 converts the continuously changing self-oscillation signal into a pulse sequence with a specific duty cycle, namely, the second PWM control signal.

[0036] In some embodiments, the wave generating unit 211 includes: a first operational amplifier A1, a first resistor R1, a first capacitor C1, a second resistor R2, a third resistor R3, a fourth resistor R4, a second capacitor C2, and a fifth resistor R5.

[0037] Among them, the first input end of the first operational amplifier A1 is connected to the output end of the wave-generating unit 211, the second input end of the first operational amplifier A1 is connected to the output end of the first operational amplifier A1 through the first resistor R1, the first power supply end of the first operational amplifier A1 is connected to the first power supply, and the second power supply end of the first operational amplifier A1 is grounded; the first end of the first capacitor C1 is connected to the first input end of the first operational amplifier A1, and the second end of the first capacitor C1 is grounded; the first end of the second resistor R2 is connected to the output end of the wave-generating unit 211, and the second end of the second resistor R2 is connected to the output end of the first operational amplifier A1; the first end of the third resistor R3 is connected to the second power supply end of the first operational amplifier A1, and the second end of the third resistor R3 is connected to the second input end of the first operational amplifier A1; the first end of the fourth resistor R4 is connected to the second input end of the first operational amplifier A1, and the second end of the fourth resistor R4 is connected to the first power supply; the first end of the second capacitor C2 is grounded, and the second end of the second capacitor C2 is connected to the second end of the fourth resistor R4; the first end of the fifth resistor R5 is connected to the first power supply, and the second end of the fifth resistor R5 is connected to the output end of the first operational amplifier A1.

[0038] Specifically, when the power is turned on, the voltages at the first input terminal and the second input terminal of the first operational amplifier A1 are both zero. At this time, the voltage at the output terminal of the first operational amplifier A1 is also zero. At a certain moment, when a small voltage jump occurs at the output terminal of the first operational amplifier A1, this small voltage will cause a voltage difference at the input terminal of the first operational amplifier A1, thereby causing the voltage at the output terminal of the first operational amplifier A1 to be saturated.

[0039] When the voltage at the first input of first operational amplifier A1 is less than the voltage at its second input, the output of first operational amplifier A1 reaches forward saturation, and first capacitor C1 begins to charge. When the voltage across capacitor C1 is greater than the voltage across its second input, the output voltage of first operational amplifier A1 becomes negative, and capacitor C1 reversely charges (discharges). When the voltage across capacitor C1 is less than the voltage across its second input, the output voltage of first operational amplifier A1 becomes positive. This reciprocating cycle generates a periodic waveform similar to a triangular wave, known as a self-oscillating signal.

[0040] In some embodiments, the comparison unit 212 includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second operational amplifier A2, a ninth resistor R9, a tenth resistor R10, a first diode D1, and a third capacitor C3. In one embodiment, the first diode D1 may include multiple diodes connected in parallel, such as D1-1 and D1-2, to filter the first power supply. A filtering capacitor, such as a tenth capacitor C10, may be added.

[0041] Among them, the first end of the sixth resistor R6 is connected to the output end of the wave-generating unit 211; the first end of the seventh resistor R7 is connected to the first power supply; the first end of the eighth resistor R8 is connected to the second end of the seventh resistor R7, and the second end of the eighth resistor R8 is grounded; the first input end of the second operational amplifier A2 is connected to the second end of the sixth resistor R6, and the second input end of the second operational amplifier A2 is connected to the first end of the eighth resistor R8; the first end of the ninth resistor R9 is connected to the output end of the second operational amplifier A2, and the second end of the ninth resistor R9 is connected to the voltage conversion module 12; the first end of the tenth resistor R10 is connected to the first end of the seventh resistor R7, and the second end of the tenth resistor R10 is connected to the output end of the second operational amplifier A2; the cathode of the first diode D1 is connected to the first power supply, and the anode of the first diode D1 is connected to the second end of the seventh resistor R7; the third capacitor C3 is connected in parallel with the eighth resistor R8.

[0042] Specifically, high and low level outputs are performed through the second operational amplifier A2. When the voltage at the first input terminal of the second operational amplifier A2, that is, the output voltage of the wave-generating unit 211, is greater than the voltage at the second input terminal of the second operational amplifier A2, the second operational amplifier A2 outputs a low level signal; when the voltage at the first input terminal of the second operational amplifier A2 is less than the voltage at the second input terminal of the second operational amplifier A2, the second operational amplifier A2 outputs a high level signal, and so on and so forth, ultimately outputting a second PWM control signal of a specific frequency.

[0043] In one embodiment, as shown by t=RC, by adjusting the resistance values of the first resistor R1 and the second resistor R2 in the feedback path of the first operational amplifier A1, the charge and discharge time of the first capacitor C1 can be changed, thereby adjusting the frequency and duty cycle of the second PWM control signal.

[0044] See Figure 3 , Figure 3 1 is a schematic structural diagram of a third embodiment of a driving circuit provided in the present application. The driving circuit 100 includes a main driving module 10 and an auxiliary driving module 20 .

[0045] The main drive module 10 includes a main control module 11, two voltage conversion modules 12, and an inverter module 13. The main control module 11 is configured to output a first PWM control signal; the two voltage conversion modules 12 are connected to the main control module 11 and are configured to output a first control signal and a second control signal based on the first PWM control signal; wherein the first control signal is a high level and the second control signal is a low level; the inverter module 13 includes an upper three-bridge power switch component 131 and a lower three-bridge power switch component 132. The two voltage conversion modules 12 are respectively connected to the upper three-bridge power switch component 131 and the lower three-bridge power switch component 132. When connected to the motor, the inverter module 13 is configured to control the motor based on the first control signal and the second control signal.

[0046] The auxiliary drive module 20 includes an oscillator module 21. The oscillator module 21 is coupled to the voltage conversion module 12 connected to the lower three-bridge power switch assembly 132 and is configured to output a second PWM control signal to the voltage conversion module 12 when the main control module 11 fails to output the first PWM control signal, so that the voltage conversion module 12 continues to output the first control signal and the second control signal.

[0047] In some embodiments, the voltage conversion module 12 includes a control unit 121 and a voltage conversion unit 122 . The control unit 121 is connected to the main control module 11 and the oscillation module 21 ; the voltage conversion unit 122 is connected to the control unit 121 , the second power supply, and the inverter module 13 .

[0048] The control unit 121 is configured to control the voltage transformation unit 122 to output the first control signal and the second control signal based on the first PWM control signal or the second PWM control signal.

[0049] Specifically, the first PWM control signal or the second PWM control signal is shaped and amplified by a power management chip (not shown) to improve the signal's driving capability and anti-interference ability. During the shaping process, the power management chip removes noise and glitches from the signal, making the edge of the PWM wave steeper, thereby ensuring the accuracy and stability of the signal.

[0050] The control unit 121 includes a switching component. The shaped and amplified first or second PWM control signal is transmitted to the switching component, controlling its on and off state. The voltage transformation unit 122 includes a voltage transformation component and an energy storage component. The voltage transformation component uses electromagnetic induction to increase or decrease voltage. During periods when the first or second PWM control signal is at a high level, the switching component is on. The voltage of the second power supply passes through the primary side of transformer T. Based on the turns ratio of transformer T, a corresponding voltage is generated on the secondary side. This voltage is also stored in the energy storage component, providing a continuous output voltage when the switching component is off.

[0051] In some embodiments, the control unit 121 includes an eleventh resistor R11 , a control switch SW, a twelfth resistor R12 , a thirteenth resistor R13 , and a fourth capacitor C4 .

[0052] Among them, the first end of the eleventh resistor R11 is connected to the main control module 11 and the oscillation module 21; the first end of the control switch SW is connected to the transformation unit 122, the second end of the control switch SW is grounded, and the control end of the control switch SW is connected to the second end of the eleventh resistor R11; the first end of the twelfth resistor R12 is connected to the control end of the control switch SW, and the second end of the twelfth resistor R12 is connected to the second end of the control switch SW; the first end of the thirteenth resistor R13 is connected to the second end of the control switch SW; the first end of the fourth capacitor C4 is connected to the second end of the thirteenth resistor R13, and the second end of the fourth capacitor C4 is connected to the transformation unit 122.

[0053] Specifically, the control switch SW may be a MOS transistor, more specifically an NMOS transistor. Its operating state is controlled by a voltage signal at the gate (i.e., the control terminal) of the NMOS transistor. When the first PWM control signal or the second PWM control signal is at a high level, the control switch SW is turned on. When the first PWM control signal or the second PWM control signal is at a low level, the control switch SW is turned off. In other embodiments, the first switch transistor may also be a PMOS transistor, a triode, or other semiconductor device, which are not listed here.

[0054] In some embodiments, the voltage transformation unit 122 includes: a second diode D2 , a transformer T, a third diode D3 , a fifth capacitor C5 , a fourth diode D4 , a sixth capacitor C6 , and a fourteenth resistor R14 .

[0055] Among them, the anode of the second diode D2 is grounded; the first end of the primary side of the transformer T is connected to the cathode of the second diode D2, the second end of the primary side of the transformer T is connected to the second power supply, and the third end of the primary side of the transformer T is connected to the control unit 121; the anode of the third diode D3 is connected to the first end of the secondary side of the transformer T; the first end of the fifth capacitor C5 is connected to the cathode of the third diode D3, and the second end of the fifth capacitor C5 is connected to the second end of the secondary side of the transformer T; the cathode of the fourth diode D4 is connected to the third end of the secondary side of the transformer T; the first end of the sixth capacitor C6 is connected to the second end of the secondary side of the transformer T, and the second end of the sixth capacitor C6 is connected to the anode of the fourth diode D4; the first end of the fourteenth resistor R14 is connected to the second end of the sixth capacitor C6, and the second end of the fourteenth resistor R14 is connected to the inverter module 13.

[0056] In one embodiment, when the output voltage of the second power supply is low, it needs to be boosted by a transformer T, and in order to convert the AC voltage generated by the secondary side of the transformer T into a DC voltage and provide a stable positive and negative voltage signal to the inverter module 13, a rectifier diode is required for rectification. Specifically, for the output of the first control signal and the second control signal, the secondary side of the transformer T can be designed as a plurality of segmented windings with different numbers of turns. By reasonably connecting these segmented windings, control signals of different voltages can be output. When the control switch SW is turned on and the AC voltage generated by the secondary side of the transformer T is in the positive half cycle, the third diode D3 and the fourth diode D4 are turned on, and the current flows to the load through the diodes, while charging and storing energy in the fifth capacitor C5 and the sixth capacitor C6; when the AC voltage is in the negative half cycle, the third diode D3 and the fourth diode D4 are turned off to prevent the current from flowing in the opposite direction. At this time, the fifth capacitor C5 and the sixth capacitor C6 discharge to continue supplying power to the load.

[0057] In some embodiments, the voltage transformation unit 122 further includes: a fifteenth resistor R15, a voltage stabilizing chip U, a sixteenth resistor R16, a seventeenth resistor R17, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9.

[0058] Among them, the first end of the fifteenth resistor R15 is connected to the cathode of the third diode D3; the input end IN of the voltage regulator chip U is connected to the cathode of the third diode D3, the enable end EN of the voltage regulator chip U is connected to the second end of the fifteenth resistor R15, and the output end OUT of the voltage regulator chip U is connected to the inverter module 13; the first end of the sixteenth resistor R16 is connected to the feedback end FB of the voltage regulator chip U, and the second end of the sixteenth resistor R16 is connected to the output end OUT of the voltage regulator chip U; the first end of the seventeenth resistor R17 is connected to the feedback end FB of the voltage regulator chip U, and the second end of the seventeenth resistor R17 is connected to the second end of the secondary side of the transformer T; the first end of the seventh capacitor C7 is connected to the feedback end of the voltage regulator chip U, and the second end of the seventh capacitor C7 is connected to the output end OUT of the voltage regulator chip U; the first end of the eighth capacitor C8 is connected to the output end OUT of the voltage regulator chip U, and the second end of the eighth capacitor C8 is connected to the second end of the secondary side of the transformer T, the ground end GND of the voltage regulator chip U, and the DELAY pin of the voltage regulator chip U. The first end of the ninth capacitor C9 is connected to the output end OUT of the voltage regulator chip U, and the second end of the ninth capacitor C9 is connected to the first end of the sixth capacitor C6.

[0059] Specifically, the input voltage on the primary side of transformer T may fluctuate, for example, due to an unstable secondary power source or changes in grid voltage. Load changes can also affect the output voltage on the secondary side of transformer T. A sudden increase or decrease in load can cause the output voltage to change accordingly. Voltage regulator chip U monitors the output voltage in real time. If the output voltage deviates from the set value, it automatically adjusts the operating state of its internal circuitry to maintain a stable output voltage near the set value, providing a stable voltage for the load.

[0060] Specifically, when the control switch SW is on, the voltage on the secondary side of the transformer T is input to the input terminal IN and the enable terminal EN of the voltage regulator chip U through the third diode D3, causing the output terminal of the voltage regulator chip U to output the first control signal. Simultaneously, the feedback terminal FB of the voltage regulator chip U collects this voltage signal in real time and compares it with an internally set reference voltage to regulate the output stability of the first control signal. When the control switch SW is off, the fifth capacitor C5 discharges to ensure the continuous output of the first control signal.

[0061] In some embodiments, filtering processing is performed on the second power supply by adding filtering capacitors, such as the thirteenth capacitor C13 and the fourteenth capacitor C14. Similarly, the eleventh capacitor C11 and the twelfth capacitor C12 also achieve filtering and other functions.

[0062] In some embodiments, when the main control module 11 fails to output the first PWM control signal and the upper three-bridge power switch components are turned off, the oscillation module 21 outputs the second PWM control signal to the voltage conversion module 12, so that the voltage conversion module 12 outputs the first control signal to control the lower three-bridge power switch components to turn on.

[0063] Specifically, the upper and lower three-bridge power switch assemblies are connected to the battery. When a high-speed vehicle experiences a sudden fault, it must enter the ASC (Active Short Circuit) state for safety reasons. This state requires shutting down the upper three-bridge power switch assembly while simultaneously turning on the lower three-bridge power switch assembly, causing the motor to short-circuit the three-phase line at the negative battery terminal, generating a small braking torque that both meets torque safety requirements and allows the speed to be reduced quickly. If the main control module 11 fails and cannot normally output the first PWM control signal, the system may be unable to enter the ASC state. However, the second PWM control signal output by the oscillation module 21 enables the system to reliably perform the ASC function, thereby improving system reliability.

[0064] The present application also provides an electronic device 1000 , which includes a driving circuit 100 . The driving circuit 100 is the same as the above-mentioned driving circuit 100 and will not be described in detail herein.

[0065] A technical solution adopted by the present application is to provide a drive circuit 100, which includes: a main drive module 10, which includes: a main control module 11, which is configured to output a first PWM control signal; two voltage conversion modules 12, which are connected to the main control module 11, and each voltage conversion module 12 is configured to output a first control signal and a second control signal based on the first PWM control signal; wherein the first control signal is a high level and the second control signal is a low level; an inverter module 13, which includes an upper three-bridge power switch component 131 and a lower three-bridge power switch component 132, and the two voltage conversion modules 12 are connected to the main control module 11, and the two voltage conversion modules 12 are ... connected to the main control module 11, and the two voltage conversion modules 12 are connected to the main control module 11, and the two voltage conversion modules 12 are connected to the main control module 11, and the two voltage conversion modules 12 are connected to the main control module The voltage conversion module 12 is connected to the upper three-bridge power switch component 131 and the lower three-bridge power switch component 132 respectively. The inverter module 13 is configured to control the motor based on the first control signal and the second control signal when connected to the motor. The auxiliary drive module 20 includes an oscillation module 21. The oscillation module 21 is coupled to the voltage conversion module 12 connected to the lower three-bridge power switch component 132 and is configured to output a second PWM control signal to the voltage conversion module 12 when the main control module 11 fails to output the first PWM control signal, so that the voltage conversion module 12 continues to output the first control signal and the second control signal. Through the above method, when the main control module 11 fails to normally output the first PWM control signal, it can switch to the auxiliary drive module 20 to output the second PWM control signal through the oscillation module 21, so that the voltage conversion module 12 continues to output the first control signal and the second control signal of the positive and negative voltages, control the conduction of the lower three-bridge power switch component 132 in the inverter module 13, enter the ASC mode, maintain stable operation of the system, and thus improve the stability, flexibility and reliability of the system.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical functional division. In actual implementation, other division methods may be used, such as combining or integrating multiple units or components into another system, or ignoring or not implementing certain features.

[0067] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of this embodiment.

[0068] In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The above-mentioned integrated units may be implemented in the form of hardware or software functional units.

[0069] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A driving circuit, characterized in that: The driving circuit includes: a main driving module and an auxiliary driving module; Wherein, the main driving module includes: a main control module, wherein the main control module is configured to output a first PWM control signal; Two voltage conversion modules, connected to the main control module, each of the voltage conversion modules being configured to output a first control signal and a second control signal based on the first PWM control signal; wherein the first control signal is a high level and the second control signal is a low level; an inverter module, comprising an upper three-bridge power switch component and a lower three-bridge power switch component, wherein the two voltage conversion modules are respectively connected to the upper three-bridge power switch component and the lower three-bridge power switch component, and the inverter module is configured to control the motor based on the first control signal and the second control signal when connected to the motor; The auxiliary drive module includes: an oscillation module, the oscillation module being coupled to the voltage conversion module connected to the lower three-bridge power switch component, and being configured to output a second PWM control signal to the voltage conversion module when the main control module fails to output the first PWM control signal, so that the voltage conversion module continues to output the first control signal and the second control signal.

2. The driving circuit according to claim 1, wherein: The oscillation module includes: a wave-generating unit connected to a first power source, wherein the wave-generating unit outputs a self-excited oscillation signal after being powered by the first power source; A comparison unit is connected to the wave generating unit, the first power supply and the voltage conversion module, and is configured to output the second PWM control signal based on the self-excited oscillation signal.

3. The driving circuit according to claim 2, wherein: The wave generating unit comprises: a first operational amplifier, wherein a first input terminal of the first operational amplifier is connected to the output terminal of the wave-generating unit, a second input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier via a first resistor, a first power supply terminal of the first operational amplifier is connected to the first power supply, and a second power supply terminal of the first operational amplifier is grounded; a first capacitor, wherein a first end of the first capacitor is connected to the first input end of the first operational amplifier, and a second end of the first capacitor is grounded; a second resistor, wherein a first end of the second resistor is connected to the output end of the wave generating unit, and a second end of the second resistor is connected to the output end of the first operational amplifier; a third resistor, wherein a first end of the third resistor is connected to the second power supply terminal of the first operational amplifier, and a second end of the third resistor is connected to the second input terminal of the first operational amplifier; a fourth resistor, wherein a first end of the fourth resistor is connected to the second input end of the first operational amplifier, and a second end of the fourth resistor is connected to the first power supply; a second capacitor, wherein a first end of the second capacitor is grounded, and a second end of the second capacitor is connected to the second end of the fourth resistor; a fifth resistor, wherein a first end of the fifth resistor is connected to the first power supply, and a second end of the fifth resistor is connected to the output end of the first operational amplifier.

4. The driving circuit according to claim 2, wherein: The comparison unit includes: a sixth resistor, a first end of the sixth resistor being connected to the output end of the wave generating unit; a seventh resistor, a first end of the seventh resistor being connected to the first power supply; an eighth resistor, wherein a first end of the eighth resistor is connected to the second end of the seventh resistor, and a second end of the eighth resistor is grounded; a second operational amplifier, wherein a first input terminal of the second operational amplifier is connected to the second end of the sixth resistor, and a second input terminal of the second operational amplifier is connected to the first end of the eighth resistor; a ninth resistor, wherein a first end of the ninth resistor is connected to the output end of the second operational amplifier, and a second end of the ninth resistor is connected to the voltage conversion module; a tenth resistor, wherein a first end of the tenth resistor is connected to the first end of the seventh resistor, and a second end of the tenth resistor is connected to the output end of the second operational amplifier; a first diode, wherein a cathode of the first diode is connected to the first power supply, and an anode of the first diode is connected to the second end of the seventh resistor; A third capacitor is connected in parallel with the eighth resistor.

5. The driving circuit according to claim 1, wherein: The voltage conversion module includes: a control unit, connected to the main control module and the oscillation module; a voltage transformation unit, connected to the control unit, the second power supply and the inverter module; The control unit is configured to control the voltage transformation unit to output the first control signal and the second control signal based on the first PWM control signal or the second PWM control signal.

6. The driving circuit according to claim 5, wherein: The control unit comprises: an eleventh resistor, a first end of the eleventh resistor being connected to the main control module and the oscillation module; a control switch, wherein a first end of the control switch is connected to the voltage transformation unit, a second end of the control switch is grounded, and a control end of the control switch is connected to the second end of the eleventh resistor; a twelfth resistor, wherein a first end of the twelfth resistor is connected to the control end of the control switch, and a second end of the twelfth resistor is connected to the second end of the control switch; a thirteenth resistor, a first end of the thirteenth resistor being connected to the second end of the control switch; A fourth capacitor, wherein a first end of the fourth capacitor is connected to the second end of the thirteenth resistor, and a second end of the fourth capacitor is connected to the voltage transformation unit.

7. The driving circuit according to claim 5, wherein: The transformer unit include: a second diode, wherein the anode of the second diode is grounded; a transformer, wherein a first end of the primary side of the transformer is connected to the cathode of the second diode, a second end of the primary side of the transformer is connected to the second power supply, and a third end of the primary side of the transformer is connected to the control unit; a third diode, wherein the anode of the third diode is connected to the first terminal of the secondary side of the transformer; a fifth capacitor, wherein a first end of the fifth capacitor is connected to the cathode of the third diode, and a second end of the fifth capacitor is connected to the second end of the secondary side of the transformer; a fourth diode, wherein a cathode of the fourth diode is connected to the third terminal of the secondary side of the transformer; a sixth capacitor, wherein a first end of the sixth capacitor is connected to the second end of the secondary side of the transformer, and a second end of the sixth capacitor is connected to the anode of the fourth diode; a fourteenth resistor, wherein a first end of the fourteenth resistor is connected to the second end of the sixth capacitor, and a second end of the fourteenth resistor is connected to the inverter module.

8. The driving circuit according to claim 7, wherein: The voltage transformation unit further includes: a fifteenth resistor, wherein a first end of the fifteenth resistor is connected to a cathode of the third diode; a voltage stabilizing chip, wherein an input end of the voltage stabilizing chip is connected to the cathode of the third diode, an enable end of the voltage stabilizing chip is connected to the second end of the fifteenth resistor, and an output end of the voltage stabilizing chip is connected to the inverter module; a sixteenth resistor, wherein a first end of the sixteenth resistor is connected to the feedback end of the voltage stabilizing chip, and a second end of the sixteenth resistor is connected to the output end of the voltage stabilizing chip; a seventeenth resistor, wherein a first end of the seventeenth resistor is connected to the feedback end of the voltage stabilizing chip, and a second end of the seventeenth resistor is connected to the second end of the secondary side of the transformer; a seventh capacitor, wherein a first end of the seventh capacitor is connected to the feedback end of the voltage stabilizing chip, and a second end of the seventh capacitor is connected to the output end of the voltage stabilizing chip; an eighth capacitor, wherein a first end of the eighth capacitor is connected to the output end of the voltage stabilizing chip, and a second end of the eighth capacitor is connected to the second end of the secondary side of the transformer; A ninth capacitor, wherein a first end of the ninth capacitor is connected to the output end of the voltage stabilizing chip, and a second end of the ninth capacitor is connected to the first end of the sixth capacitor.

9. The driving circuit according to claim 1, wherein: When the main control module fails to output the first PWM control signal and the upper three-bridge power switch component is turned off, the oscillation module outputs the second PWM control signal to the voltage conversion module, so that the voltage conversion module outputs the first control signal to control the lower three-bridge power switch component to turn on.

10. An electronic device, characterized in that: The electronic device comprises the driving circuit according to any one of claims 1 to 9.

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