Driving circuit and electronic device

Abstract

The application discloses a driving circuit and electronic equipment, the driving circuit includes main drive module and auxiliary drive module. Wherein, the main drive module includes main control module, voltage conversion module and inverter module; the auxiliary drive module includes oscillation module. Through the above mode, when the main control module cannot normally output the PWM control signal, the second PWM control signal is output through the oscillation module by switching to the auxiliary drive module, so that the voltage conversion module continuously outputs the positive and negative voltage control signal and the second control signal, the lower three bridge power switch assembly in the inverter module is turned on, so as to enter the ASC mode, maintain the stable operation of the system, thereby improving the stability, flexibility and reliability of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic circuits, in particular to a driving circuit and an electronic device. BACKGROUND

[0002] In a new energy vehicle using a permanent magnet synchronous motor, a driving module plays a vital role in ensuring the accuracy and stability of the power transmission of the entire system. The traditional driving module needs to use a main control module, such as an MCU (Microcontroller Unit), to issue a PWM (Pulse Width Modulation) signal to control the switch tube in the forward or flyback module to turn on, and convert low voltage into positive and negative voltage required by the driving module.

[0003] In actual application, such as in a high-speed running state, encountering electrostatic breakdown of the main control chip or electromagnetic interference leading to software failure will affect the generation of the PWM signal. In addition, the main control chip may also fail to normally generate waves due to manufacturing defects, aging and other self-faults. Abnormal PWM signals will cause the switch tube to be unable to turn on and off according to the normal timing, and the energy conversion process in the forward or flyback circuit will be affected. At the same time, in order to protect the safety of the circuit and the device, the upper and lower drive bridge arms in the motor inverter will quickly lock the wave, output a low level, and make the entire driving system stop working, thereby affecting the accuracy and stability of the power transmission of the system. SUMMARY

[0004] To solve the above problems, the present application provides a driving circuit and an electronic device, which can switch to a backup control path to output the PWM signal when the main control module cannot normally output the PWM signal, so that the forward or flyback module continuously outputs positive and negative voltage, controls the lower three-bridge power switch component in the inverter module to turn on, enters the ASC mode, and maintains the stable operation of the system, thereby improving the stability, flexibility and reliability of the system.

[0005] The technical scheme adopted by the application is as follows: a driving circuit is provided, the driving circuit comprises: a main driving module, the main driving module comprises: a main control module, the main control module is configured to output a first PWM control signal; two voltage conversion modules, the two voltage conversion modules are 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 high level, and the second control signal is low level; an inverter module, the inverter module comprises an upper three-bridge power switch assembly and a lower three-bridge power switch assembly, the two voltage conversion modules are respectively connected to the upper three-bridge power switch assembly and the lower three-bridge power switch assembly, and the inverter module is configured to control a motor based on the first control signal and the second control signal when the inverter module is connected to the motor; and an auxiliary driving module, the auxiliary driving module comprises: an oscillation module, the oscillation module is coupled to the voltage conversion module connected to the lower three-bridge power switch assembly, and is configured to output a second PWM control signal to the voltage conversion module to enable the voltage conversion module to continue to output the first control signal and the second control signal when the main control module fails to output the first PWM control signal.

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

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

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

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

[0010] In an embodiment, 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, a first end of the control switch being connected to the voltage transformation unit, a second end of the control switch being grounded, and a control end of the control switch being connected to a second end of the eleventh resistor; a twelfth resistor, a first end of the twelfth resistor being connected to the control end of the control switch, and a second end of the twelfth resistor being 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; and a fourth capacitor, a first end of the fourth capacitor being connected to a second end of the thirteenth resistor, and a second end of the fourth capacitor being connected to the voltage transformation unit.

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

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

[0013] In an embodiment, the oscillation module outputs a second PWM control signal to the voltage transformation module to make the voltage transformation module output a first control signal to control the lower three-bridge power switch assembly to turn on when the main control module fails to output the first PWM control signal and the upper three-bridge power switch assembly turns off.

[0014] The application further provides an electronic device comprising the driving circuit as described above.

[0015] The technical scheme adopted by the application is as follows: a driving circuit is provided, and the driving circuit comprises: a main driving module, the main driving module comprises: 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 high level, and the second control signal is low level; an inverter module comprising an upper three-bridge power switch assembly and a lower three-bridge power switch assembly, the two voltage conversion modules are connected to the upper three-bridge power switch assembly and the lower three-bridge power switch assembly respectively, and the inverter module is configured to control a motor based on the first control signal and the second control signal when the inverter module is connected to the motor; and an auxiliary driving module, the auxiliary driving module comprises: an oscillation module, the oscillation module is coupled to the voltage conversion module connected to the lower three-bridge power switch assembly, 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. In the above manner, when the main control module fails to normally output the first 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 first control signal and the second control signal of positive and negative voltages, the lower three-bridge power switch assembly in the inverter module is turned on, the ASC mode is entered, the system is maintained to stably operate, and the system stability, flexibility and reliability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0017] Figure 1 is a structural schematic diagram of a first embodiment of the driving circuit provided by the present application;

[0018] Figure 2 is a structural schematic diagram of a second embodiment of the driving circuit provided by the present application;

[0019] Figure 3 is a structural schematic diagram of a third embodiment of the driving circuit provided by the present application;

[0020] Figure 4 is a structural schematic diagram of an embodiment of the electronic device provided by the present application. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of the present application.

[0022] The terms "first", "second", and the like in the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0023] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiment, and is not necessarily mutually exclusive of other embodiments or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that embodiments described herein can be combined with other embodiments.

[0024] Reference is made to Figure 1 , Figure 1 FIG. 1 is a structural schematic diagram of a driving circuit according to an embodiment of the present application. The driving circuit 100 includes a main driving module 10 and an auxiliary driving module 20.

[0025] The main driving 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. The first control signal is high level and the second control signal is low level. The inverter module 13 includes an upper three-bridge power switch assembly 131 and a lower three-bridge power switch assembly 132. The two voltage conversion modules 12 are respectively connected to the upper three-bridge power switch assembly 131 and the lower three-bridge power switch assembly 132. The inverter module 13 is configured to control a motor based on the first control signal and the second control signal when the inverter module 13 is connected to the motor.

[0026] The auxiliary driving module 20 comprises an oscillation module 21. The oscillation 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.

[0027] Specifically, the main control module 11 can be an MCU. In the process of generating the first PWM control signal, the MCU first sets the frequency and duty cycle parameters of the first PWM control signal according to system requirements. These parameters can be flexibly adjusted through software programming to meet the control requirements in different application scenarios. The MCU configures these parameters to a timer / counter module, and the timer / counter starts working according to the set parameters to generate the waveform of the corresponding first PWM control signal and sends it out through a specific output pin, thereby realizing the control of the output of the voltage conversion module 12.

[0028] The voltage conversion module 12 is an important part of the electronic system for realizing voltage conversion, and usually includes a switch assembly, a transformer assembly, and an energy storage assembly, which are used to convert the input power 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 works based on the PWM control signal (such as the first PWM control signal). When receiving the PWM control signal, the switch assembly (such as the MOSFET tube) in the voltage conversion module 12 will be quickly turned on and off according to the duty cycle of the PWM control signal, so that the transformer assembly converts the power voltage (such as boosts the voltage). During the on period of the switch assembly, the energy storage assembly stores energy; during the off period of the switch assembly, the energy storage assembly releases energy and transmits the energy to the output end through auxiliary elements such as diodes, thereby forming the required output voltage.

[0029] In an 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, and the precise control of the first control signal and the second control signal can be realized, thereby realizing the control of the inverter module 13.

[0030] Specifically, the inverter module 13 is usually composed of a plurality of power tubes (such as IGBT or MOSFET) to form a full-bridge or half-bridge circuit structure. These power tubes act as switches in the circuit, and by controlling their on and off states, the input DC voltage can be converted into an AC voltage output with a certain frequency and amplitude. The positive and negative voltages (the first control signal and the second control signal) control the switching action of the power tubes in the inverter module 13, ensuring that the power tubes can reliably turn on and off within the appropriate voltage range. The stability of the first control signal and the second control signal also directly affects the normal operation of the power tubes and the quality of the output waveform of the inverter module 13.

[0031] For example, in a motor drive system, the AC voltage output by the inverter module 13 needs to be accurately controlled in terms of frequency and amplitude to achieve precise regulation of motor speed and torque, and 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.

[0032] In an embodiment, when the MCU fails to normally output the first PWM control signal due to software failure or chip damage, etc., the second PWM control signal is output by the oscillation module 21 in the auxiliary drive module 20, which can ensure the normal output of the first control signal and the second control signal, and thus ensure that the lower three-bridge power switch component 132 in the inverter module 13 can be normally turned on to enter the ASC mode.

[0033] Referring to Figure 2 , Figure 2 is a structural schematic diagram of the second embodiment of the driving circuit provided by the present application, which includes a main drive module 10 and an auxiliary drive module 20.

[0034] 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 high and the second control signal is low; the inverter module 13 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 respectively connected to the upper three-bridge power switch component 131 and the lower three-bridge power switch component 132; the inverter module 13 is configured to control a motor when connected to the motor based on the first control signal and the second control signal.

[0035] The auxiliary driving module 20 comprises an oscillation module 21. The oscillation 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 first PWM control signal output by the master control module 11 fails, so that the voltage conversion module 12 continues to output the first control signal and the second control signal.

[0036] In some embodiments, the oscillation module 21 comprises a generating unit 211 and a comparison unit 212. The generating unit 211 is connected to the first power supply and outputs a self-oscillation signal after being powered by the first power supply; the comparison unit 212 is connected to the generating unit 211, the first power supply and the voltage conversion module 12, and is configured to output the second PWM control signal based on the self-oscillation signal.

[0037] The generating unit 211 can autonomously output the self-oscillation signal without external input of an excitation signal after being powered. The comparison unit 212 compares and analyzes the self-oscillation signal generated by the generating unit 211 with a reference signal to generate and control the second PWM control signal.

[0038] Specifically, the generating unit 211 is composed of an amplifying circuit and a positive and negative feedback circuit. The amplifying circuit provides gain for signal amplification, and the positive and negative feedback circuit is used to realize self-oscillation. It feeds back part of the output signal of the amplifying circuit to the input end, causes a pressure difference at the input end, realizes the change of the output signal, and thus forms a continuous oscillation process to output the self-oscillation signal. The comparison unit 212 usually contains a high-precision comparator. One input end receives the self-oscillation signal, and the other input end accesses 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 comparing with the instantaneous amplitude of the self-oscillation signal; or it can be a signal with a certain waveform and frequency to realize more complex modulation of the second PWM control signal.

[0039] When the self-oscillation signal is input to one input end of the comparator, the comparator monitors the amplitude in real time and compares it with the reference signal. If the amplitude of the self-oscillation signal is higher than that of the reference signal, the output end of the comparator outputs a high-level signal; otherwise, when the amplitude of the self-oscillation signal is lower than that of the reference signal, the comparator outputs a low-level signal. Through this continuous comparison and judgment process, the comparison unit 212 converts the continuously changing self-oscillation signal into a pulse sequence with a certain duty cycle, i.e. the second PWM control signal.

[0040] In some embodiments, the discharge unit 211 comprises 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.

[0041] The first input terminal of the first operational amplifier A1 is connected to the output terminal of the discharge unit 211, the second input terminal of the first operational amplifier A1 is connected to the output terminal of the first operational amplifier A1 through the first resistor R1, the first power supply terminal of the first operational amplifier A1 is connected to the first power supply, and the second power supply terminal of the first operational amplifier A1 is grounded. The first terminal of the first capacitor C1 is connected to the first input terminal of the first operational amplifier A1, and the second terminal of the first capacitor C1 is grounded. The first terminal of the second resistor R2 is connected to the output terminal of the discharge unit 211, and the second terminal of the second resistor R2 is connected to the output terminal of the first operational amplifier A1. The first terminal of the third resistor R3 is connected to the second power supply terminal of the first operational amplifier A1, and the second terminal of the third resistor R3 is connected to the second input terminal of the first operational amplifier A1. The first terminal of the fourth resistor R4 is connected to the second input terminal of the first operational amplifier A1, and the second terminal of the fourth resistor R4 is connected to the first power supply. The first terminal of the second capacitor C2 is grounded, and the second terminal of the second capacitor C2 is connected to the second terminal of the fourth resistor R4. The first terminal of the fifth resistor R5 is connected to the first power supply, and the second terminal of the fifth resistor R5 is connected to the output terminal of the first operational amplifier A1.

[0042] Specifically, at the time of power-on, the voltages of the first input terminal and the second input terminal of the first operational amplifier A1 are both equal to zero, at this time, the output terminal voltage of the first operational amplifier A1 is also zero. At a certain moment, when the output terminal of the first operational amplifier A1 produces a small voltage jump, this small voltage will cause a voltage difference at the input terminal of the first operational amplifier A1, so that the output terminal voltage of the first operational amplifier A1 is saturated.

[0043] When the voltage of the first input terminal of the first operational amplifier A1 is less than the voltage of the second input terminal, the output terminal of the first operational amplifier A1 reaches positive saturation, and the first capacitor C1 starts to charge. When the voltage across the first capacitor C1 is greater than the voltage of the second input terminal of the first operational amplifier A1, the output voltage of the first operational amplifier A1 is negative, at this time, the first capacitor C1 is reversed charged (discharged); when the voltage across the first capacitor C1 is less than the voltage of the second input terminal of the first operational amplifier A1, the output voltage of the first operational amplifier A1 is positive. Thus, it is reciprocated to generate a periodic waveform similar to a triangular wave, i.e. a self-excited oscillation signal.

[0044] 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. Among them, in an embodiment, the first diode D1 can include a plurality of diodes in parallel, such as D1-1 and D1-2, filtering the first power supply, which can increase the filtering capacitance, such as the tenth capacitor C10.

[0045] Among them, the first end of the sixth resistor R6 is connected to the output end of the emission 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.

[0046] Specifically, the high and low level output is realized through the second operational amplifier A2. When the voltage at the first input end of the second operational amplifier A2, i.e., the output voltage of the emission unit 211, is greater than the voltage at the second input end of the second operational amplifier A2, the second operational amplifier A2 outputs a low level signal; when the voltage at the first input end of the second operational amplifier A2 is less than the voltage at the second input end of the second operational amplifier A2, the second operational amplifier A2 outputs a high level signal, thereby reciprocating, and finally outputting a second PWM control signal of a specific frequency.

[0047] In an embodiment, by t=RC, by adjusting the resistance values of the first resistor R1 and the second resistor R2 on the feedback path of the first operational amplifier A1, the charging and discharging time of the first capacitor C1 can be changed, thereby adjusting the frequency and duty cycle of the second PWM control signal.

[0048] Referring to Figure 3 , Figure 3 is a structural schematic diagram of the third embodiment of the driving circuit provided by the present application. The driving circuit 100 includes a main driving module 10 and an auxiliary driving module 20.

[0049] 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 high and the second control signal is low; the inverter module 13 includes an upper three-bridge power switch assembly 131 and a lower three-bridge power switch assembly 132, and the two voltage conversion modules 12 are respectively connected to the upper three-bridge power switch assembly 131 and the lower three-bridge power switch assembly 132; the inverter module 13 is configured to control the motor based on the first control signal and the second control signal when the inverter module 13 is connected to the motor.

[0050] 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 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.

[0051] In some embodiments, the voltage conversion module 12 includes a control unit 121 and a voltage transformation unit 122. The control unit 121 is connected to the main control module 11 and the oscillation module 21; the voltage transformation unit 122 is connected to the control unit 121, a second power supply and the inverter module 13.

[0052] 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.

[0053] Specifically, the first PWM control signal or the second PWM control signal is shaped and amplified by a power management chip (not shown in the figure) to improve the driving ability and anti-interference ability of the signal; during shaping, the power management chip removes noise and burrs in the signal, making the edges of the PWM wave steeper, and ensuring the accuracy and stability of the signal.

[0054] The control unit 121 includes a switch assembly, and the first PWM control signal or the second PWM control signal after shaping and amplification is transmitted to the switch assembly to control its conduction and shutdown. The voltage transformation unit 122 includes a voltage transformation assembly and an energy storage assembly. The voltage transformation assembly realizes the increase or decrease of voltage through electromagnetic induction principle. During the high level period of the first PWM control signal or the second PWM control signal, the switch assembly is turned on. The voltage of the second power supply passes through the primary side of the transformer T, and according to the turns ratio relationship of the transformer T, the corresponding voltage is generated in the secondary side; the voltage is also stored in the energy storage assembly to provide continuous output voltage during the shutdown period of the switch assembly.

[0055] In some embodiments, the control unit 121 comprises an eleventh resistor R11, a control switch SW, a twelfth resistor R12, a thirteenth resistor R13, and a fourth capacitor C4.

[0056] The first end of the eleventh resistor R11 is connected to the master control module 11 and the oscillation module 21; the first end of the control switch SW is connected to the voltage conversion 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 voltage conversion unit 122.

[0057] Specifically, the control switch SW can be an MOS transistor, specifically an NMOS transistor, whose working state is controlled by the gate voltage signal (i.e., the control end) of the NMOS transistor. When the first PWM control signal or the second PWM control signal is high, the control switch SW is turned on, and when the first PWM control signal or the second PWM control signal is low, the control switch SW is turned off. In other embodiments, the first switch tube can also be a PMOS tube, a transistor, and other semiconductor devices, which are not listed one by one here.

[0058] In some embodiments, the voltage conversion unit 122 comprises 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.

[0059] The anode of the second diode D2 is grounded; the primary side first end of the transformer T is connected to the cathode of the second diode D2, the primary side second end of the transformer T is connected to the second power supply, and the primary side third end of the transformer T is connected to the control unit 121; the anode of the third diode D3 is connected to the primary side first end 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 secondary side second end of the transformer T; the cathode of the fourth diode D4 is connected to the secondary side third end of the transformer T; the first end of the sixth capacitor C6 is connected to the secondary side second end 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.

[0060] In an embodiment, when the output voltage of the second power supply is low, it is necessary to boost the voltage through the transformer T, and in order to convert the alternating voltage generated by the secondary side of the transformer T into a direct current voltage and provide stable positive and negative voltage signals to the inverter module 13, it is necessary to use rectifier diodes 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 segmented winding with multiple different numbers of turns. By reasonably connecting these segmented windings, control signals with different voltages can be output. When the control switch SW is turned on, the alternating 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, the current flows to the load through the diode, and at the same time, the fifth capacitor C5 and the sixth capacitor C6 are charged and stored energy; when the alternating voltage is in the negative half cycle, the third diode D3 and the fourth diode D4 are cut 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 to supply power to the load.

[0061] In some embodiments, the voltage transformation unit 122 further comprises 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.

[0062] 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 stabilizing chip U is connected to the cathode of the third diode D3, the enable end EN of the voltage stabilizing chip U is connected to the second end of the fifteenth resistor R15, and the output end OUT of the voltage stabilizing 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 stabilizing chip U, and the second end of the sixteenth resistor R16 is connected to the output end OUT of the voltage stabilizing chip U; the first end of the seventeenth resistor R17 is connected to the feedback end FB of the voltage stabilizing 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 stabilizing chip U, and the second end of the seventh capacitor C7 is connected to the output end OUT of the voltage stabilizing chip U; the first end of the eighth capacitor C8 is connected to the output end OUT of the voltage stabilizing 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 and the ground end GND of the voltage stabilizing chip U and the DELAY pin of the voltage stabilizing chip U. The first end of the ninth capacitor C9 is connected to the output end OUT of the voltage stabilizing chip U, and the second end of the ninth capacitor C9 is connected to the first end of the sixth capacitor C6.

[0063] Specifically, the input voltage of the primary side of the transformer T may fluctuate, for example, the second power supply is unstable or the grid voltage changes; at the same time, the change of the load will also affect the output voltage of the secondary side of the transformer T, when the load suddenly increases or decreases, the output voltage will change accordingly. The voltage stabilizing chip U can monitor the output voltage in real time, and when the output voltage deviates from the set value, it automatically adjusts the working state of its internal circuit to keep the output voltage stable around the set value, providing stable voltage for the load.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] The technical scheme adopted by the application is: a driving circuit 100 is provided, the driving circuit 100 comprises: a main driving module 10, the main driving module 10 comprises: a main control module 11, the main control module 11 is configured to output a first PWM control signal; two voltage conversion modules 12, connected to the main control module 11, 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 high level, and the second control signal is low level; an inverter module 13, comprising an upper three-bridge power switch assembly 131 and a lower three-bridge power switch assembly 132, the two voltage conversion modules 12 are connected to the upper three-bridge power switch assembly 131 and the lower three-bridge power switch assembly 132 respectively, the inverter module 13 is configured to be connected to a motor, and control the motor based on the first control signal and the second control signal; an auxiliary driving module 20, the auxiliary driving module 20 comprises: an oscillation module 21, the oscillation 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. In the above manner, when the main control module 11 cannot normally output the first PWM control signal, the auxiliary driving module 20 is switched to output the second PWM control signal through the oscillation module 21, so that the voltage conversion module 12 continuously outputs the first control signal and the second control signal of positive and negative voltage, controls the conduction of the lower three-bridge power switch assembly 132 in the inverter module 13, enters the ASC mode, and maintains stable operation of the system, thereby improving system stability, flexibility and reliability.

[0070] In several embodiments provided in the present 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 only schematic, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0071] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment scheme.

[0072] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0073] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, is 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 transformer 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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