Driving circuit and electronic device

Abstract

The application provides a driving circuit and electronic equipment, and relates to the technical field of device driving. The driving circuit comprises a control component, a first push-pull bridge arm, a second push-pull bridge arm and a driven component. The control component is connected with the first push-pull bridge arm, the first push-pull bridge arm is connected with the second push-pull bridge arm, and the second push-pull bridge arm is connected with the driven component. The control component is used for generating a first driving signal and driving the first push-pull bridge arm based on the first driving signal. The first push-pull bridge arm is used for processing the first driving signal to obtain a second driving signal and driving the second push-pull bridge arm based on the second driving signal. The second push-pull bridge arm is used for processing the second driving signal to obtain a control signal and controlling the driven component to be turned on or turned off based on the control signal. The signal is amplified twice through the two push-pull bridge arms, so that the switch of the driven component can be effectively driven based on the control signal, the overall volume and loss of the driving circuit are effectively reduced, and the driving effect of the driving circuit is optimized.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of power electronics technology towards high efficiency, high power density, high temperature operation, the traditional silicon-based power semiconductor devices are gradually approaching the physical limit in performance. The devices based on SiC MOSFET (Silicon Carbide Metal Oxide Semiconductor Field Effect Transistor) have great application potential and broad market prospects in the field of medium and high voltage and high power applications due to their lower on-resistance, higher switching speed, better high temperature working ability, and smaller switching loss.

[0003] However, the inherent excellent characteristics of SiC MOSFET also bring new problems to the design of the driving circuit, and the mature silicon-based IGBT or Si-MOSFET driving scheme cannot be directly and simply followed. SiC MOSFET devices require higher switching speed, higher anti-interference requirement, more stringent gate voltage requirement, universal requirement of negative voltage turn-off, and improvement of power density. In the existing application scheme of SiC MOSFET devices, the required isolation circuit has a large volume and cannot meet the low-power multi-channel driving circuit control requirement. The loss and pressure during driving are large, the driving effect is poor, and it cannot meet the current driving requirement. SUMMARY

[0004] Therefore, the purpose of the embodiments of the present application is to provide a driving circuit and an electronic device to improve the poor driving effect of the device in the prior art.

[0005] In order to solve the above problems, in a first aspect, the embodiments of the present application provide a driving circuit, which comprises a control component, a first push-pull bridge arm, a second push-pull bridge arm and a driven component.

[0006] The control component is connected with the first push-pull bridge arm, the first push-pull bridge arm is connected with the second push-pull bridge arm, and the second push-pull bridge arm is connected with the driven component.

[0007] The control component is configured to generate a first driving signal and drive the first push-pull bridge arm based on the first driving signal.

[0008] The first push-pull bridge arm is configured to process the first driving signal to obtain a second driving signal and drive the second push-pull bridge arm based on the second driving signal.

[0009] The secondary push-pull bridge arm is used for processing the secondary drive signal to obtain a control signal, and controlling the driven component to be turned on or turned off based on the control signal.

[0010] In the implementation process, the driving circuit is provided with a control component capable of generating a primary drive signal, the primary drive signal can drive a corresponding primary push-pull bridge arm, and the primary push-pull bridge arm can also amplify the primary drive signal to obtain a corresponding secondary drive signal, the secondary drive signal can drive a corresponding secondary push-pull bridge arm, and the secondary push-pull bridge arm can also amplify the secondary drive signal to obtain a final control signal to control the driven component to be turned on or turned off according to the control signal. The signal can be amplified twice based on the two-stage push-pull bridge arms provided, effectively providing a large-power control signal to control the driven component, achieving a higher driving frequency under the same power consumption, and the driving signals are isolated from each other, effectively reducing the circuit volume required for isolation packaging, meeting the low-power multi-channel driving circuit control requirements in various application scenarios, having less power consumption and pressure during driving, and having a better driving effect.

[0011] Optionally, the primary drive signal includes a first type of signal and a second type of signal, and the secondary drive signal includes a first drive signal and a second drive signal.

[0012] The primary push-pull bridge arm includes a first push-pull bridge arm and a second push-pull bridge arm.

[0013] The first push-pull bridge arm is connected to an isolated power supply and a zero potential end.

[0014] The second push-pull bridge arm is connected to an isolated power supply and a zero potential end.

[0015] The first push-pull bridge arm is used for amplifying the first type of signal in the primary drive signal and outputting the first drive signal.

[0016] The second push-pull bridge arm is used for amplifying the second type of signal in the primary drive signal and outputting the second drive signal.

[0017] In the implementation process, the first driving signal includes mutually isolated first signals and second signals, the second driving signal includes the first driving signal and the second driving signal, in order to process the first driving signal, the first push-pull bridge arm and the second push-pull bridge arm can be arranged in the first push-pull bridge arm, and the two push-pull bridge arms are connected with the isolated power supply and the zero potential end, so as to supply power to the first push-pull bridge arm based on the isolated power supply, thereby reducing the transformer winding and volume. The first push-pull bridge arm can amplify the first signals in the first driving signal to obtain and output the corresponding first driving signal, and the second push-pull bridge arm can amplify the second signals in the first driving signal to obtain and output the corresponding second driving signal. Two push-pull bridge arms can be arranged in the first push-pull bridge arm to amplify the multiple signals respectively, thereby effectively improving the first-stage signal amplification effect.

[0018] Optionally, the first push-pull bridge arm includes a first resistor, a second resistor, a first PMOS and a first NMOS.

[0019] The gate of the first PMOS is connected with the first resistor, the source of the first PMOS is connected with the isolated power supply, the drain of the first PMOS is connected with the drain of the first NMOS, the gate of the first NMOS is connected with the second resistor, the source of the first NMOS is connected with the zero potential end, and the first resistor and the second resistor are connected with the control component.

[0020] The second push-pull bridge arm includes a third resistor, a fourth resistor, a second PMOS and a second NMOS.

[0021] The gate of the second PMOS is connected with the third resistor, the source of the second PMOS is connected with the isolated power supply, the drain of the second PMOS is connected with the drain of the second NMOS, the gate of the second NMOS is connected with the fourth resistor, the source of the second NMOS is connected with the zero potential end, and the third resistor and the fourth resistor are connected with the control component.

[0022] In the implementation process, the first push-pull bridge arm and the second push-pull bridge arm can respectively include two resistors, a PMOS device and an NMOS device, and the corresponding push-pull bridge arm is formed by connecting the devices. The two-way isolated signals in the first signals or the second signals can be amplified by the PMOS device and the NMOS device respectively, so as to obtain the corresponding first driving signal and the second driving signal.

[0023] Optionally, the second push-pull bridge arm is used for amplifying the first driving signal and the second driving signal, and outputs the control signal.

[0024] The second push-pull bridge arm comprises a first level shift circuit, a second level shift circuit, a fifth resistor, a sixth resistor, a third PMOS and a third NMOS;

[0025] The first push-pull bridge arm is connected with the fifth resistor based on the first level shift circuit, the fifth resistor is connected with the gate of the third PMOS, the first level shift circuit is connected with a driving power supply, and the source of the third PMOS is connected with the driving power supply;

[0026] The second push-pull bridge arm is connected with the sixth resistor based on the second level shift circuit, the sixth resistor is connected with the gate of the third NMOS, the second level shift circuit is connected with a negative power supply, and the source of the third NMOS is connected with the negative power supply;

[0027] The drain of the third PMOS is connected with the drain of the third NMOS, and the control signal is output.

[0028] In the implementation process, the second push-pull bridge arm can comprise PMOS devices and NMOS devices with connected drains, and resistors and level shift circuits connected with the PMOS devices and the NMOS devices, respectively. The first driving signal and the second driving signal received can be amplified at the second level based on the PMOS devices and the NMOS devices, respectively, and the final control signal can be output in combination with the connected drains of the PMOS devices and the NMOS devices. In addition, the level shift circuit can be used to realize floating driving, and the turn-off trailing problem of BJT caused by the totem pole push-pull bridge composed of BJT can be reduced.

[0029] Optionally, the first level shift circuit comprises a first capacitor, a seventh resistor and a first diode.

[0030] The seventh resistor and the first diode are connected in parallel to form a first parallel structure, the first capacitor is connected with the first push-pull bridge arm and the fifth resistor, a first end of the first parallel structure is connected with the driving power supply, and a second end of the first parallel structure is connected between the first capacitor and the fifth resistor.

[0031] The second level shift circuit comprises a second capacitor, an eighth resistor and a second diode.

[0032] The eighth resistor and the second diode are connected in parallel to form a second parallel structure, the second capacitor is connected with the second push-pull bridge arm and the sixth resistor, a first end of the second parallel structure is connected with the negative power supply, and a second end of the second parallel structure is connected between the second capacitor and the sixth resistor.

[0033] In the implementation process, the two level shift circuits can respectively include corresponding capacitors, resistors and diode devices, and the parallel structure formed by the resistors and the diodes in parallel is connected across the driving power supply / negative power supply and the corresponding capacitor end, so as to realize the corresponding level shift effect. The BJT device can be replaced by the two level shift circuits to realize the driving floating.

[0034] Optionally, the driving circuit further comprises a first power supply control circuit;

[0035] The first power supply control circuit is connected with the isolation power supply, the driving power supply, the zero potential end and the control component;

[0036] The first power supply control circuit is used for controlling the driving voltage of the driving power supply based on the first driving signal.

[0037] In the implementation process, considering the voltage requirements of multiple power supplies in the driving circuit, the driving circuit can further have a first power supply control circuit for controlling the driving voltage of the driving power supply. The first power supply control circuit is connected with the isolation power supply, the driving power supply, the zero potential end and the control component, and can perform charging processing according to the level of the first driving signal output by the control component, so as to control the driving voltage of the driving power supply, realize a higher driving voltage, and thus provide a corresponding reference voltage for the secondary push-pull bridge arm based on the higher driving voltage, realize a higher power output, and further optimize the driving performance of the driving circuit.

[0038] Optionally, the driving circuit further comprises a second power supply control circuit;

[0039] The second power supply control circuit is connected with the negative power supply, the zero potential end and the control component;

[0040] The second power supply control circuit is used for controlling the negative voltage of the negative power supply based on the first driving signal.

[0041] In the implementation process, considering the voltage requirements of multiple power supplies in the driving circuit, the driving circuit can further have a second power supply control circuit for controlling the negative voltage of the negative power supply. The second power supply control circuit is connected with the negative power supply, the zero potential end and the control component, and can perform charging processing according to the level of the first driving signal output by the control component, so as to control the negative voltage of the negative power supply, obtain the required negative voltage, provide a corresponding reference voltage for the secondary push-pull bridge arm based on the appropriate negative voltage, realize a higher power output, and further optimize the driving performance of the driving circuit.

[0042] Optionally, the control component comprises a control chip;

[0043] The control chip is connected with the isolation power supply, and the isolation power supply is used for providing working power for the control chip.

[0044] The control chip is configured to generate the primary driving signal based on an internal crystal oscillator.

[0045] In the implementation process, the control component can include a control chip capable of generating a primary driving signal with multi-path isolation based on an internal crystal oscillator, and an isolation power supply is connected to the control chip to supply power to the control chip, effectively reducing the circuit volume occupied by the isolation gate package required for transmitting the multi-path isolation driving signal.

[0046] Optionally, the driven component includes a plurality of switch circuits connected in parallel, and each of the switch circuits is provided with a switch device.

[0047] The plurality of switch circuits are connected to the secondary push-pull bridge arm.

[0048] The plurality of switch circuits are configured to control the switch devices to turn on or turn off based on the control signal.

[0049] In the implementation process, the driven component can include a plurality of switch circuits connected in parallel, and each of the switch circuits is provided with a corresponding switch device. The plurality of switch circuits are connected to the secondary push-pull bridge arm to receive the output control signal. The control signal can simultaneously control the turn-on and turn-off of the plurality of switch devices in the plurality of switch circuits, that is, the plurality of switch devices can be simultaneously driven to work, achieving a higher driving frequency and further optimizing the driving performance of the driving circuit.

[0050] In a second aspect, the embodiments of the present application also provide an electronic device, which includes the driving circuit of any one of the first aspect.

[0051] In summary, the embodiments of the present application provide a driving circuit and an electronic device. The two-stage push-pull bridge arm amplifies the signal twice to drive the switches of the driven component based on the control signal, effectively reducing the overall volume and loss of the driving circuit and optimizing the driving effect of the driving circuit. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0053] Figure 1 A structural schematic diagram of a driving circuit provided by the embodiments of the present application;

[0054] Figure 2A detailed structure schematic diagram of a driving circuit provided by an embodiment of the present application is shown in the following table:

[0055] Figure 3 A driving waveform of a driving signal provided by an embodiment of the present application is shown in the following table:

[0056] Figure 4 A structure schematic diagram of a first power supply control circuit provided by an embodiment of the present application is shown in the following table:

[0057] Figure 5 A structure schematic diagram of a second power supply control circuit provided by an embodiment of the present application is shown in the following table.

[0058] Icon: 100-control component; 110-control chip; 120-optocoupler; 200-first push-pull bridge arm; 210-first push-pull bridge arm; 220-second push-pull bridge arm; 300-second push-pull bridge arm; 400-driven component; 410-switching circuit; 411-switching device; sig1-first driving signal; sig2-second driving signal; sig21-first driving signal; sig22-second driving signal; sig3-control signal; R1-first resistor; R2-second resistor; P1-first PMOS; N1-first NMOS; R3-third resistor; R4-fourth resistor; P2-second PMOS; N2-second NMOS; A1-first level shift circuit; A2-second level shift circuit; R5-fifth resistor; R6-sixth resistor; P3-third PMOS; N3-third NMOS; C1-first capacitor; R7-seventh resistor; D1-first diode; C2-second capacitor; R8-eighth resistor; D2-second diode; R9-ninth resistor; R10-tenth resistor; D3-third diode; VCC1-isolation power supply; VCC2-driving power supply; VEE-negative power supply; GND-zero potential terminal; Da-fourth diode; Db-fifth diode; Dc-sixth diode; Dd-seventh diode; De-eighth diode; Df-ninth diode; Dg-twelfth diode; Dh-eleventh diode; Ca-third capacitor; Cb-fourth capacitor; Cc-fifth capacitor; Cd-sixth capacitor; Ce-seventh capacitor; Cf-eighth capacitor; Cg-ninth capacitor; Ch-tenth capacitor; Ci-eleventh capacitor. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0060] Due to the excellent inherent characteristics of SiC MOSFET, new problems are also brought to the design of the driving circuit, and the mature silicon-based IGBT or Si-MOSFET driving scheme cannot be directly and simply used, for example, the SiC MOSFET device requires higher switching speed, higher anti-interference requirement, stricter gate voltage requirement, general requirement of negative voltage off, and improvement of power density, etc. Therefore, in the existing application scheme of the SiC MOSFET device, the volume of the required isolation circuit is large, and the low-power multi-channel driving circuit control requirement cannot be met, the loss and pressure during driving are large, the driving effect is poor, and the current driving requirement cannot be met.

[0061] In order to solve the above problems, the embodiment of the present application provides a driving circuit and electronic equipment, which amplifies the signal twice through two-stage push-pull bridge arms, so as to drive the switch of the driven component based on the control signal, effectively reduces the overall volume and loss of the driving circuit, and optimizes the driving effect of the driving circuit.

[0062] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the driving circuit provided by the embodiment of the present application can include: a control component 100, a first-stage push-pull bridge arm 200, a second-stage push-pull bridge arm 300 and a driven component 400.

[0063] The control component 100 is connected with the first push-pull bridge arm 200, the first push-pull bridge arm 200 is connected with the second push-pull bridge arm 300, and the second push-pull bridge arm 300 is connected with the driven component 400. The control component 100 is used to generate a first driving signal sig1, and drive the first push-pull bridge arm 200 based on the first driving signal sig1. The first push-pull bridge arm 200 is used to process the first driving signal sig1 to obtain a second driving signal sig2, and drive the second push-pull bridge arm 300 based on the second driving signal sig2. The second push-pull bridge arm 300 is used to process the second driving signal sig2 to obtain a control signal sig3, and control the driven component 400 to be turned on or turned off based on the control signal sig3. The driving circuit is provided with the control component 100 capable of generating the first driving signal sig1. The first driving signal sig1 can drive the corresponding first push-pull bridge arm 200. The first push-pull bridge arm 200 can also amplify the first driving signal sig1 to obtain the corresponding second driving signal sig2. The second driving signal sig2 can drive the corresponding second push-pull bridge arm 300. The second push-pull bridge arm 300 can also amplify the second driving signal sig2 to obtain the final control signal sig3, so as to control the driven component 400 to be turned on or turned off according to the control signal sig3. The signal can be amplified twice based on the two-stage push-pull bridge arms, which effectively provides a high-power control signal sig3 to control the driven component 400, realizes a higher driving frequency under the same power consumption, and the driving signals are isolated from each other, effectively reducing the circuit volume required for isolation packaging, meeting the low-power multi-channel driving circuit control requirements in various application scenarios, and having small power consumption and pressure during driving and good driving effect.

[0064] Optionally, the control component 100 can include various devices capable of generating multi-channel isolated driving pulse signals, such as various types of isolators, drivers, optical coupling arrays, magnetic coupling arrays, etc. The driven component 400 can be provided with multi-channel driven devices, such as power MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tubes, etc.

[0065] Optionally, please refer to Figure 2 , Figure 2 A detailed structure diagram of a driving circuit provided by the embodiment of the application.

[0066] Optionally, the control component 100 can comprise a control chip 110 connected to an isolated power supply VCC1 for providing working power for the control chip 110, and the control chip 110 is configured to generate a first driving signal sig1 based on an internal crystal oscillator. The control component 100 can comprise a control chip 110 capable of generating a first driving signal sig1 with multiple isolated signals based on its own internal crystal oscillator, and the isolated power supply VCC1 is connected to the control chip 110 to supply power for the control chip 110, without the need to set an isolation gate structure for isolation, thus avoiding the problem of limited power bearing of the LDMOS (Lateral Diffused Metal Oxide Semiconductor) in the existing solution, and effectively reducing the circuit volume occupied by the isolation gate package required for transmitting the driving signal of the multiple isolated signals.

[0067] For example, the control chip 110 can be a corresponding CPLD (Complex Programmable Logic Device) chip capable of directly generating multiple PWM (Pulse Width Modulation) signals as the first driving signal sig1, for example Figure 2 4 isolated signals, i.e., sig1-1, sig1-2, sig1-3, and sig1-4, as shown in FIG. 1B, and the control component 100 can further be provided with a corresponding optocoupler 120 to isolate the multiple signals based on the optocoupler 120.

[0068] Optionally, considering that the first driving signal sig1 comprises multiple driving signals, in order to effectively process the multiple driving signals, the first push-pull bridge arm 200 can comprise a first push-pull bridge arm 210 and a second push-pull bridge arm 220, and the first push-pull bridge arm 210 is connected to the isolated power supply VCC1 and a zero potential end GND, and the second push-pull bridge arm 220 is connected to the isolated power supply VCC1 and the zero potential end GND.

[0069] The zero potential end GND is a reference zero potential point of the driving circuit.

[0070] It should be noted that the first driving signal sig1 can be a PWM signal. Figure 2For example, in the first-stage drive signal sig1 generated by the control chip 110, the first two signals, i.e., sig1-1 and sig1-2, can be used as the first type of signal input into the first push-pull bridge arm 210 for processing, and the last two signals, i.e., sig1-3 and sig1-4, can be used as the second type of signal input into the second push-pull bridge arm 220. The first push-pull bridge arm 210 is configured to amplify the first type of signal in the first-stage drive signal sig1 and output a first drive signal sig21, and the second push-pull bridge arm 220 is configured to amplify the second type of signal in the first-stage drive signal sig1 and output a second drive signal sig22. The first-stage drive signal sig1 includes the first type of signal and the second type of signal which are isolated from each other, and the second-stage drive signal sig2 includes the first drive signal sig21 and the second drive signal sig22. In order to process the first-stage drive signal sig1, the first-stage push-pull bridge arm 200 can be provided with the first push-pull bridge arm 210 and the second push-pull bridge arm 220, and the two push-pull bridge arms are connected to the isolated power supply VCC1 and the zero potential end GND to supply power to the first-stage push-pull bridge arm 200 based on the isolated power supply VCC1, thereby reducing the volume and the number of windings of the transformer. The first push-pull bridge arm 210 can amplify the first type of signal in the first-stage drive signal sig1 and output the corresponding first drive signal sig21, and the second push-pull bridge arm 220 can amplify the second type of signal in the first-stage drive signal sig1 and output the corresponding second drive signal sig22. The two push-pull bridge arms in the first-stage push-pull bridge arm 200 can be configured to amplify multiple signals, thereby effectively improving the amplification effect of the first-stage signal.

[0071] Optionally, the first push-pull bridge arm 210 can include a first resistor R1, a second resistor R2, a first PMOS P1, and a first NMOS N1. The gate of the first PMOS P1 is connected to the first resistor R1, the source of the first PMOS P1 is connected to the isolated power supply VCC1, the drain of the first PMOS P1 is connected to the drain of the first NMOS N1, the gate of the first NMOS N1 is connected to the second resistor R2, the source of the first NMOS N1 is connected to the zero potential end GND, and the first resistor R1 and the second resistor R2 are connected to the control component 100.

[0072] Optionally, the second push-pull bridge arm 220 can include a third resistor R3, a fourth resistor R4, a second PMOS P2, and a second NMOS N2. The gate of the second PMOS P2 is connected to the third resistor R3, the source of the second PMOS P2 is connected to the isolated power supply VCC1, the drain of the second PMOS P2 is connected to the drain of the second NMOS N2, the gate of the second NMOS N2 is connected to the fourth resistor R4, the source of the second NMOS N2 is connected to the zero potential end GND, and the third resistor R3 and the fourth resistor R4 are connected to the control component 100.

[0073] For example, sig1-1 in the first type of signal is input to the gate of the first PMOS P1 after passing through the first resistor R1, and sig1-2 is input to the gate of the first NMOS N1 after passing through the second resistor R2. The first resistor R1 is connected to the gate of the first PMOS P1, the source of which is connected to the isolated power supply VCC1, and the drain of which is connected to the drain of the first NMOS N1, and the gate of the first NMOS N1 is connected to the second resistor R2, the source of which is connected to the zero potential terminal GND, thereby forming the first push-pull bridge arm 210 to amplify the first type of signal. The structure and signal path of the second push-pull bridge arm 220 are similar to those of the first push-pull bridge arm 210, and will not be described in detail here.

[0074] In order to achieve the first-stage signal amplification effect, the first push-pull bridge arm 210 and the second push-pull bridge arm 220 can each include two resistors, a PMOS device and an NMOS device, which are connected to form a corresponding push-pull bridge arm. The two isolated signals in the first type of signal or the second type of signal can be amplified by the PMOS device and the NMOS device, respectively, to obtain the corresponding first driving signal sig21 and the second driving signal sig22.

[0075] Please continue to refer to Figure 2 The second-stage push-pull bridge arm 300 is used to amplify the first driving signal sig21 and the second driving signal sig22, and output the control signal sig3.

[0076] Alternatively, the second-stage push-pull bridge arm 300 can include a first level shift circuit A1, a second level shift circuit A2, a fifth resistor R5, a sixth resistor R6, a third PMOS P3 and a third NMOS N3. The first push-pull bridge arm 210 is connected to the fifth resistor R5 based on the first level shift circuit A1, the fifth resistor R5 is connected to the gate of the third PMOS P3, the first level shift circuit A1 is connected to the driving power supply VCC2, and the source of the third PMOS P3 is connected to the driving power supply VCC2. The second push-pull bridge arm 220 is connected to the sixth resistor R6 based on the second level shift circuit A2, the sixth resistor R6 is connected to the gate of the third NMOS N3, the second level shift circuit A2 is connected to the negative power supply VEE, and the source of the third NMOS N3 is connected to the negative power supply VEE. The drain of the third PMOS P3 is connected to the drain of the third NMOS N3, and the control signal sig3 is output.

[0077] It should be noted that, in the case of the isolation power supply VCC1 being 5V, the driving power supply VCC2 being 20V, and the negative power supply VEE being -5V, the third PMOS P3 needs a driving waveform with the driving power supply VCC2 as the reference ground, and the signal generated by the first driving signal sig21 cannot be directly used, therefore, the first level shift circuit A1 is designed to change the input waveform value to 15V~20V (VCC2-5V~VCC2) relative to the zero potential end GND, and the third NMOS N3 needs a driving waveform with the negative power supply VEE as the reference ground, and the signal generated by the second driving signal sig22 cannot be directly used, therefore, the second level shift circuit A2 is designed to change the input waveform value to -5V~0V (VEE-~VEE+5V) relative to the zero potential end GND.

[0078] In order to realize the second-stage signal amplification effect, the second-stage push-pull bridge arm 300 can include PMOS devices and NMOS devices connected at the drain, and resistors and level shift circuits connected with the PMOS devices and the NMOS devices, respectively. The first driving signal sig21 and the second driving signal sig22 received can be amplified by the PMOS devices and the NMOS devices, respectively, and the final control signal sig3 can be output by the drain connected with the PMOS devices and the NMOS devices. In addition, the level shift circuit can be used to realize floating driving, and reduce the turn-off tail problem of the BJT caused by the totem pole push-pull bridge composed of the BJT.

[0079] Optionally, the first level shift circuit A1 can include a first capacitor C1, a seventh resistor R7, and a first diode D1. The seventh resistor R7 and the first diode D1 are connected in parallel to form a first parallel structure, the first capacitor C1 is connected between the first push-pull bridge arm 210 and the fifth resistor R5; a first end of the first parallel structure is connected with the driving power supply VCC2, and a second end of the first parallel structure is connected between the first capacitor C1 and the fifth resistor R5.

[0080] Optionally, the second level shift circuit A2 can include a second capacitor C2, an eighth resistor R8, and a second diode D2. The eighth resistor R8 and the second diode D2 are connected in parallel to form a second parallel structure, the second capacitor C2 is connected between the second push-pull bridge arm 220 and the sixth resistor R6; a first end of the second parallel structure is connected with the negative power supply VEE, and a second end of the second parallel structure is connected between the second capacitor C2 and the sixth resistor R6.

[0081] For example, the drain of the first PMOS P1 and the first NMOS N1 is connected with a first capacitor C1, a seventh resistor R7 and a first diode D1 in parallel, which are connected between the driving power supply VCC2 and the first capacitor C1 and the fifth resistor R5 to form a first level shift circuit A1. The cathode of the first diode D1 is connected to the driving power supply VCC2, and the anode is connected to the fifth resistor R5. The fifth resistor R5 is connected to the gate of the third PMOS P3. The drain of the second PMOS P2 and the second NMOS N2 is connected with a second capacitor C2, an eighth resistor R8 and a second diode D2 in parallel, which are connected between the negative power supply VEE and the eighth capacitor and the sixth resistor R6 to form a second level shift circuit A2. The anode of the second diode D2 is connected to the negative power supply VEE, and the cathode is connected to the sixth resistor R6. The sixth resistor R6 is connected to the gate of the third NMOS N3. The source of the third PMOS P3 is connected to the driving power supply VCC2, and the source of the third NMOS N3 is connected to the negative power supply VEE. The drain of the third PMOS P3 and the third PMOS P3 is connected together to output a control signal sig3, which completes the second stage amplification of the driving signal.

[0082] Among them, two level shift circuits can respectively include corresponding capacitor, resistor and diode devices. The parallel structure formed by connecting the resistor and the diode in parallel is connected between the driving power supply VCC2 / negative power supply VEE and the corresponding capacitor end, so as to realize the corresponding level shift effect. The BJTs can be replaced by the two level shift circuits to realize the driving floating.

[0083] Please refer to Figure 3 , Figure 3The driving waveform of the driving signal provided by the embodiment of the application includes multiple signals sig1-1, sig1-2, sig1-3 and sig1-4 in a first driving signal sig1, a first driving signal sig21 and a second driving signal sig22 in a second driving signal sig2, and a control signal sig3 finally obtained. The working process of the driving circuit can include: the control chip 110 generates four PWM signals (sig1-1, sig1-2, sig1-3 and sig1-4) based on the isolation power supply VCC1 to drive the first push-pull bridge arm 210 and the second push-pull bridge arm 220. When the four PWM signals are high, the first PMOSP1 and the second PMOSP2 are disconnected, the first NMOSN1 and the second NMOSN2 are turned on, and the first push-pull bridge arm 210 and the second push-pull bridge arm 220 output the first driving signal sig21 and the second driving signal sig22 at low level. When the four PWM signals are low, the first PMOSP1 and the second PMOSP2 are turned on, the first NMOSN1 and the second NMOSN2 are turned off, and the first push-pull bridge arm 210 and the second push-pull bridge arm 220 output the first driving signal sig21 and the second driving signal sig22 at high level. The first driving signal sig21 and the second driving signal sig22 of the first push-pull bridge arm 210 and the second push-pull bridge arm 220 drive the second push-pull bridge arm 300. When the first driving signal sig21 and the second driving signal sig22 are high, the third PMOSP3 is disconnected, the third NMOSN3 is turned on, and the second push-pull bridge arm 300 outputs the control signal sig3 at low level. When the first driving signal sig21 and the second driving signal sig22 are low, the third PMOSP3 is turned on, the third NMOSN3 is turned off, and the second push-pull bridge arm 300 outputs the control signal sig3 at high level. The control signal sig3 output by the second push-pull bridge arm 300 can drive the driven component 400. When the control signal sig3 is high, the driven component 400 is turned on. When the control signal sig3 is low, the driven component 400 is turned off, thereby realizing the on-off control of the driven component 400.

[0084] Please continue to read Figure 2 The driven component 400 can include multiple switch circuits 410 connected in parallel, each of which is provided with a switch device 411, and the multiple switch circuits 410 are connected with the second push-pull bridge arm 300, and the multiple switch circuits 410 are used to control the switch device 411 to be turned on or turned off based on the control signal sig3.

[0085] Optionally, the switch device 411 can be a corresponding switch tube, such as a power NMOS, and the ninth resistor R9, the tenth resistor R10 and the third diode D3 can also be included in each switch circuit 410. The drain of the third PMOS P3 and the third NMOS N3 is connected in parallel with the ninth resistor R9 and the tenth resistor R10, and the tenth resistor R10 is provided with the third diode D3 in series in front. The third diode D3 can be provided as a voltage stabilizing diode, and the anode of the voltage stabilizing diode and the tenth resistor R10 are connected together. The parallel circuit composed of the ninth resistor R9, the tenth resistor R10 and the third diode D3 is connected to the gate of the driven power NMOS, so as to control the turn-on or turn-off of the power NMOS according to the high or low level of the received control signal sig3.

[0086] Optionally, in actual high-power application scenarios, the switch device 411 can adopt a two-parallel scheme to safely withstand the bus large current. The specific connection mode can include that the control signal sig3 drives the multi-way switch circuit 410, and the sources and drains of the plurality of power NMOS in the plurality of switch circuits 410 are connected in parallel.

[0087] It should be noted that considering the voltage requirements of the plurality of power supplies in the driving circuit, the driving circuit can further include a first power supply control circuit. The first power supply control circuit is connected with the isolation power supply VCC1, the driving power supply VCC2, the zero potential end GND and the control component 100, and is used to control the driving voltage of the driving power supply VCC2 based on the primary driving signal sig1. The driving circuit can also have a first power supply control circuit for controlling the driving voltage of the driving power supply VCC2. The first power supply control circuit is connected with the isolation power supply VCC1, the driving power supply VCC2, the zero potential end GND and the control component 100, and can perform charging processing according to the level of the primary driving signal sig1 output by the control component 100 to control the driving voltage of the driving power supply VCC2, realize a higher driving voltage, and thus provide a corresponding reference voltage for the secondary push-pull bridge arm 300 based on the higher driving voltage, realize higher power output, and further optimize the driving performance of the driving circuit.

[0088] Optionally, please refer to Figure 4 , Figure 4This is a schematic diagram of a first power control circuit provided in an embodiment of this application. The first power control circuit may include: the cathode of a fourth diode Da is connected to the anode of a fifth diode Db, and so on, with six diodes connected in series (fourth diode Da, fifth diode Db, sixth diode Dc, seventh diode Dd, eighth diode De, and ninth diode Df). The anode of the fourth diode Da is connected to the sixth capacitor Cd, the cathode of the fourth diode Da is connected to the third capacitor Ca, the anode of the sixth diode Dc is connected to the seventh capacitor Ce, the cathode of the sixth diode Dc is connected to the fourth capacitor Cb, the anode of the eighth diode De is connected to the eighth capacitor Cf, the cathode of the eighth diode De is connected to the fifth capacitor Cc, and the cathode of the ninth diode Df is connected to the ninth capacitor Cg. The sixth capacitor Cd, the seventh capacitor Ce, and the eighth capacitor Cf are connected to the zero potential terminal GND. The other ends of the third capacitor Ca, the fourth capacitor Cb, and the fifth capacitor Cc are connected to the control component 100 to receive the first-level drive signal sig1. The cathode of the ninth diode Df is the output of the drive power supply VCC2.

[0089] For example, in Figure 4 In the circuit structure shown, when the first-stage drive signal sig1 outputs a low level (0V), the 5V isolation power supply VCC1 charges the third capacitor Ca to the ninth capacitor Cg to 5V; when the first-stage drive signal sig1 outputs a high level (5V), the upper levels of the third capacitor Ca, the fourth capacitor Cb, and the fifth capacitor Cc are 10V, and the upper levels of the seventh capacitor Ce, the eighth capacitor Cf, and the ninth capacitor Cg are 5V. The fifth diode Db, the seventh diode Dd, and the ninth diode Df are turned on. The third capacitor Ca, the fourth capacitor Cb, and the fifth capacitor Cc charge the seventh capacitor Ce, the eighth capacitor Cf, and the ninth capacitor Cg respectively. f. When the upper voltage of the ninth capacitor Cg reaches 7.5V, charging ends. The first-stage drive signal sig1 outputs a low level again, and the upper voltage of the third capacitor Ca, the fourth capacitor Cb, and the fifth capacitor Cc reaches 2.5V. The fourth diode Da and the ninth diode Df are turned on, and the 5V power supply charges the third capacitor Ca, the seventh capacitor Ce, the fourth capacitor Cb, and the eighth capacitor Cf and the fifth capacitor Cc. When the first-stage drive signal sig1 outputs a high level again, the third capacitor Ca charges the seventh capacitor Ce, the fourth capacitor Cb, the eighth capacitor Cf, and the fifth capacitor Cc, and so on. The upper voltage of the ninth capacitor Cg is charged to about 20V, and the output 20V is used as the drive voltage of the drive power supply VCC2.

[0090] It should be noted that, considering the voltage requirements of multiple power supplies in the drive circuit, the drive circuit can further include a second power supply control circuit. The second power supply control circuit is connected to the negative power supply VEE, the zero potential end GND and the control component 100, and is used to control the negative voltage of the negative power supply VEE based on the first drive signal sig1. There can also be a second power supply control circuit in the drive circuit to control the negative voltage of the negative power supply VEE. The second power supply control circuit is connected to the negative power supply VEE, the zero potential end GND and the control component 100, and can perform charging processing according to the level of the first drive signal sig1 output by the control component 100 to control the negative voltage of the negative power supply VEE, obtain the required negative voltage, and provide the corresponding reference voltage for the secondary push-pull bridge arm 300 based on the appropriate negative voltage, realize higher power output, and further optimize the driving performance of the drive circuit.

[0091] Optionally, referring to Figure 5 , Figure 5 A structure diagram of a second power supply control circuit provided by the embodiment of the present application, which can include: a twelfth diode Dg connected in series, an eleventh diode Dh and an eleventh capacitor Ci connected in parallel, the cathode of the twelfth diode Dg connected to the eleventh diode Dh, the anode of the eleventh diode Dh connected to the tenth capacitor Ch, the other end of the tenth capacitor Ch connected to the control component 100 to receive the first drive signal sig1, the cathode of the eleventh diode Dh grounded, and the anode of the twelfth diode Dg as the VEE output.

[0092] For example, in the circuit structure shown in Figure 5 , when the first drive signal sig1 outputs a high level (5V), the left side of the tenth capacitor Ch is charged to 5V, and the right side of the tenth capacitor Ch is at 0V; when the first drive signal sig1 outputs a low level (0V), the left side of the tenth capacitor Ch is at 0V, and the right side of the tenth capacitor Ch becomes -5V, the upper end of the eleventh capacitor Ci is at 0V, the twelfth diode Dg is turned on, and the right end of the tenth capacitor Ch and the upper end of the eleventh capacitor Ci are balanced at -2.5V; when the first drive signal sig1 outputs a high level again, the right side of the tenth capacitor Ch becomes 2.5V, the eleventh diode Dh is turned on, and the right side of the tenth capacitor Ch becomes 0V; when the first drive signal sig1 outputs a low level again, the right side of the tenth capacitor Ch becomes -5V, the twelfth diode Dg is turned on, and the right side of the tenth capacitor Ch and the upper end of the eleventh capacitor Ci are balanced at -3.75V, and thus the upper end of the eleventh capacitor Ci is charged to about -5V to output -5V as the negative voltage of the negative power supply VEE.

[0093] It should be noted that the model, parameter value, etc. of each capacitor, resistor, etc. in the drive circuit provided by the embodiment of the present application can be selected and set according to actual requirements.

[0094] The electronic device can include a Personal Computer (PC), a tablet computer, a smart phone, a Personal Digital Assistant (PDA), and the like electronic device having a logic computing function.

[0095] In addition, each part in each embodiment of the present application can be integrated together to form an independent part, or each part can exist independently, or two or more parts can be integrated to form an independent part.

[0096] The above only describes the embodiments of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0097] The above only describes the embodiments of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0098] It should be noted that, in this document, relational terms such as first and second, and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, article, or apparatus that comprises the stated element.

Claims

1. A drive circuit characterized by comprising: The driving circuit comprises a control component, a first push-pull bridge arm, a second push-pull bridge arm and a driven component; The control component is connected with the first push-pull bridge arm, the first push-pull bridge arm is connected with the second push-pull bridge arm, and the second push-pull bridge arm is connected with the driven component; The control component is used for generating a first driving signal and driving the first push-pull bridge arm based on the first driving signal; The first push-pull bridge arm is used for processing the first driving signal to obtain a second driving signal and driving the second push-pull bridge arm based on the second driving signal; The second push-pull bridge arm is used for processing the second driving signal to obtain a control signal and controlling the driven component to be turned on or turned off based on the control signal; The first driving signal comprises a first type of signal and a second type of signal, the second driving signal comprises a first driving signal and a second driving signal, the first push-pull bridge arm comprises a first push-pull bridge arm and a second push-pull bridge arm, the first push-pull bridge arm is connected with an isolated power supply and a zero potential end, the second push-pull bridge arm is connected with an isolated power supply and a zero potential end, the first push-pull bridge arm is used for amplifying the first type of signal in the first driving signal, and the first driving signal is output, and the second push-pull bridge arm is used for amplifying the second type of signal in the first driving signal, and the second driving signal is output; The second push-pull bridge arm is used for amplifying the first driving signal and the second driving signal to output the control signal, the second push-pull bridge arm comprises a first level shift circuit, a second level shift circuit, a fifth resistor, a sixth resistor, a third PMOS and a third NMOS, the first push-pull bridge arm is connected with the fifth resistor based on the first level shift circuit, the fifth resistor is connected with a gate of the third PMOS, the first level shift circuit is connected with a driving power supply, and a source of the third PMOS is connected with the driving power supply, the second push-pull bridge arm is connected with the sixth resistor based on the second level shift circuit, the sixth resistor is connected with a gate of the third NMOS, the second level shift circuit is connected with a negative power supply, and a source of the third NMOS is connected with the negative power supply, a drain of the third PMOS is connected with a drain of the third NMOS, and the control signal is output.

2. The drive circuit according to claim 1, characterized in that, The first push-pull bridge arm comprises a first resistor, a second resistor, a first PMOS and a first NMOS; A gate of the first PMOS is connected with the first resistor, a source of the first PMOS is connected with the isolated power supply, a drain of the first PMOS is connected with a drain of the first NMOS, a gate of the first NMOS is connected with the second resistor, a source of the first NMOS is connected with the zero potential end, and the first resistor and the second resistor are connected with the control component; The second push-pull bridge arm comprises a third resistor, a fourth resistor, a second PMOS and a second NMOS; ​ The gate of the second PMOS is connected with the third resistor, the source of the second PMOS is connected with the isolated power supply, the drain of the second PMOS is connected with the drain of the second NMOS, the gate of the second NMOS is connected with the fourth resistor, the source of the second NMOS is connected with the zero potential terminal, and the third resistor and the fourth resistor are connected with the control component.

3. The drive circuit according to claim 1, characterized by Wherein, The first level shift circuit comprises a first capacitor, a seventh resistor and a first diode. The seventh resistor and the first diode are connected in parallel to form a first parallel structure, the first capacitor is connected with the first push-pull bridge arm and the fifth resistor, a first end of the first parallel structure is connected with the driving power supply, and a second end of the first parallel structure is connected between the first capacitor and the fifth resistor. The second level shift circuit comprises a second capacitor, an eighth resistor and a second diode. The eighth resistor and the second diode are connected in parallel to form a second parallel structure, the second capacitor is connected with the second push-pull bridge arm and the sixth resistor, a first end of the second parallel structure is connected with the negative power supply, and a second end of the second parallel structure is connected between the second capacitor and the sixth resistor.

4. The drive circuit according to any one of claims 1 to 3, characterized by The driving circuit further comprises a first power supply control circuit. The first power supply control circuit is connected with the isolated power supply, the driving power supply, the zero potential terminal and the control component. The first power supply control circuit is configured to control the driving voltage of the driving power supply based on the primary driving signal.

5. The drive circuit according to any one of claims 1 to 3, characterized by The driving circuit further comprises a second power supply control circuit. The second power supply control circuit is connected with the negative power supply, the zero potential terminal and the control component. The second power supply control circuit is configured to control the negative voltage of the negative power supply based on the primary driving signal.

6. The drive circuit according to any one of claims 1 to 3, characterized by Wherein, The control component comprises a control chip. The control chip is connected with the isolated power supply, and the isolated power supply is configured to provide working power for the control chip. The control chip is configured to generate the primary driving signal based on an internal crystal oscillator.

7. The drive circuit according to any one of claims 1 to 3, characterized by Wherein, The driven component comprises a plurality of switch circuits connected in parallel, and each of the switch circuits is provided with a switch device. The plurality of switch circuits are connected with the secondary push-pull bridge arm. The plurality of switch circuits are configured to control the switch device to be turned on or turned off based on the control signal.

8. An electronic device, comprising: The electronic device comprises the driving circuit according to any one of claims 1-7.

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