Driving device

Abstract

The utility model relates to the technical field of switching power supplies, and discloses a driving device, which comprises an isolation control circuit, a transformer and at least one isolation driving circuit, and is characterized in that the transformer comprises a primary coil and at least one secondary coil; the input end of the isolation control circuit inputs a driving signal, the first power supply end of the isolation control circuit is connected with an external power supply, the second power supply end of the isolation control circuit is grounded, and the output end of the isolation control circuit is connected with a primary coil of the transformer; the first input end of each isolation driving circuit is connected with the dotted terminal of one secondary coil of the transformer, and the second input end of each isolation driving circuit is connected with the non-dotted terminal of one secondary coil of the transformer. According to the utility model, negative pressure turn-off can be realized under the condition of single power supply, and one path of input can control multiple paths of isolation driving output, so that the use of isolation driving chips is reduced, and the cost of the device is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of switching power supply technology, and specifically to a driving device. Background Technology

[0002] With the development of semiconductor technology, silicon carbide (SiC) semiconductors have gradually replaced carbon-based semiconductors due to their superior performance. Compared with carbon-based semiconductors, SiC devices have faster switching speeds and higher dv / dt ratios, but are more prone to gate crosstalk. When the gate crosstalk voltage ΔVgs exceeds the device threshold voltage Vgs(th), the device is at risk of false turn-on. In this situation, SiC semiconductors are easily damaged. Therefore, under many operating conditions, SiC semiconductors require negative voltage turn-off to ensure system safety.

[0003] Currently, there are two commonly used semiconductor driver solutions: one uses a single-supply isolated driver chip, which has the drawback of only being able to output positive drive voltage and not supporting negative drive output; the other solution to achieve negative drive output requires a dual positive and negative power supply scheme, necessitating the design of an additional negative power supply circuit. Both of these solutions require multiple identical modules and isolated power supplies to achieve isolated multi-output, resulting in high costs. Utility Model Content

[0004] In view of this, the present invention provides a driving device to solve the problem that a driving circuit powered by a single power supply cannot be turned off under negative voltage.

[0005] This utility model provides a driving device, including: an isolation control circuit, a transformer, and at least one isolation drive circuit. The transformer includes a primary coil and at least one secondary coil. The input terminal of the isolation control circuit receives a drive signal. The first power supply terminal of the isolation control circuit is connected to an external power source, and the second power supply terminal of the isolation control circuit is grounded. The output terminal of the isolation control circuit is connected to the primary coil of the transformer. The isolation control circuit is used to output a positive drive voltage or a reverse drive voltage based on the level state of the drive signal. The first input terminal of each isolation drive circuit is connected to the same-name terminal of a secondary coil of the transformer, and the second input terminal of each isolation drive circuit is connected to a different-name terminal of a secondary coil of the transformer. The isolation drive circuit is used to turn on the output and store energy based on the positive drive voltage, or to turn off the output and release energy based on the negative voltage signal generated by the energy release, and then turn off the output based on the negative voltage signal generated by the energy release.

[0006] The driving device provided by this utility model uses a single power supply. The driving transformer has multiple secondary coils. By switching the direction of the output voltage of the isolation control circuit, the voltage direction of the multiple secondary coils changes, thereby enabling the on / off switching of the output of each isolated driving circuit. This achieves the effect of one control input and multiple isolated driving outputs. The isolated driving circuit stores or releases energy according to the direction of the secondary coil voltage, generating a negative voltage inside and reliably shutting off due to the negative voltage, ensuring that each isolated driving circuit can be reliably shut down and improving circuit reliability. Since each isolated driving circuit in this utility model is connected to a separate secondary coil, and each isolated driving circuit is isolated from each other, no additional isolation chip is required, reducing circuit cost.

[0007] In one optional embodiment, the isolation control circuit includes: a first switching circuit, a clamping circuit, and a first DC blocking circuit, wherein a first terminal of the first switching circuit is connected to an external power supply and a first terminal of the clamping circuit, a control terminal of the first switching circuit receives a drive signal, a second terminal of the first switching circuit is connected to a second terminal of the clamping circuit and a first terminal of the first DC blocking circuit, a third terminal of the first switching circuit is connected to a third terminal of the clamping circuit and grounded, and the first switching circuit is used to switch the switching state based on the level state of the drive signal, thereby switching the voltage direction of the primary coil of the transformer; the second terminal of the first DC blocking circuit is connected to the primary coil of the transformer.

[0008] In one optional embodiment, the first switching circuit includes: a first resistor, a first switch, and a second switch, wherein a first terminal of the first resistor receives a drive signal, and a second terminal of the first resistor is connected to the control terminal of the first switch and the control terminal of the second switch; a first terminal of the first switch is connected to the first terminal of the clamping circuit, and a second terminal of the first switch is connected to the first terminal of the second switch and the second terminal of the clamping circuit; and a second terminal of the second switch is connected to the third terminal of the clamping circuit.

[0009] In one optional implementation, each isolated drive circuit includes: an output circuit, a second switching circuit, and an energy storage circuit. The first terminal of the output circuit is connected to the same-name terminal of a secondary coil of the transformer; the second terminal of the output circuit is connected to the control terminal of the second switching circuit; the third terminal of the output circuit is connected to the first terminal of both the second switching circuit and the first terminal of the energy storage circuit; and the fourth terminal of the output circuit is connected to the second terminal of the energy storage circuit and grounded. The output circuit is used to turn on the output based on a positive drive voltage, or turn off the output based on a reverse drive voltage, or turn off the output based on a negative voltage signal. The second terminal of the second switching circuit is connected to the third terminal of the energy storage circuit, and the second switching circuit is used to turn off the output based on a positive drive voltage, or turn on the output based on a reverse drive voltage. The fourth terminal of the energy storage circuit is connected to a non-same-name terminal of a secondary coil of the transformer, and the energy storage circuit is used to store energy based on a positive drive voltage, or to release energy based on a reverse drive voltage and generate a negative voltage signal.

[0010] The driving device provided by this utility model allows the energy storage circuit to switch between energy storage and energy release states when the voltage direction of each secondary coil changes, thereby generating a positive or negative voltage at the third terminal of the output circuit, achieving negative voltage shutdown of the output circuit, and ensuring safe and reliable operation of the output circuit.

[0011] In one optional embodiment, the output circuit includes: a second resistor, a first diode, and a third switch, wherein a first end of the second resistor is connected to the same-named end of a secondary coil of the transformer, a second end of the second resistor is connected to the anode of the first diode and the control terminal of the second switch circuit; the cathode of the first diode is connected to the control terminal of the third switch and the first end of the second switch circuit; and a first end of the third switch is connected to the second end of the energy storage circuit.

[0012] In one optional embodiment, the second switching circuit includes a fourth switch and a second diode, wherein the control terminal of the fourth switch is connected to the second terminal of the output circuit, the first terminal of the fourth switch is connected to the third terminal of the output circuit, the second terminal of the fourth switch is connected to the anode of the second diode, and the cathode of the second diode is connected to the third terminal of the energy storage circuit.

[0013] In one optional embodiment, the energy storage circuit includes: a voltage regulator unit and an energy storage unit, wherein a first terminal of the voltage regulator unit is connected to a third terminal of the output circuit, a second terminal of the voltage regulator unit is connected to the first terminal of the energy storage unit and a fourth terminal of the output circuit; and a second terminal of the energy storage unit is connected to a non-identical terminal of a secondary coil of a transformer.

[0014] In one alternative implementation, the energy storage unit includes a first capacitor, the capacitance of which is greater than the input capacitance of the third switch.

[0015] In one optional embodiment, the isolation drive circuit further includes a first filter circuit, wherein the first terminal and the second terminal of the first filter circuit are respectively connected to the third terminal and the fourth terminal of the output circuit.

[0016] In one alternative implementation, the first filter circuit includes a third resistor and a second capacitor connected in parallel. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1This is a component diagram of a driving device according to an embodiment of the present utility model;

[0019] Figure 2 This is a specific circuit structure diagram of the isolation control circuit according to an embodiment of the present utility model;

[0020] Figure 3 This is a specific circuit structure diagram of the isolation drive circuit according to an embodiment of the present utility model;

[0021] Figure 4 This is another specific circuit structure diagram of the isolation drive circuit according to an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the working state of the isolation control circuit according to an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of another working state of the isolation control circuit according to an embodiment of the present utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] In related technologies, isolated driver chips powered by a single power supply can only output positive driving voltage and cannot achieve negative driving output, which leads to a high risk of damage to the silicon carbide semiconductor in the driver circuit due to the inability to be turned off under negative voltage. If negative driving output is to be achieved, a dual power supply scheme with positive and negative power supplies must be adopted, which increases the complexity of designing additional negative power supply circuits and circuit costs.

[0029] Therefore, this embodiment provides a driving device, such as... Figure 1 As shown, it includes: an isolation control circuit 1, a transformer 2, and at least one isolation drive circuit 3, wherein the transformer 2 includes a primary coil and at least one secondary coil; the input terminal of the isolation control circuit 1 receives a drive signal, the first power supply terminal of the isolation control circuit 1 is connected to an external power supply VCC, the second power supply terminal of the isolation control circuit 1 is grounded, and the output terminal of the isolation control circuit 1 is connected to the primary coil of the transformer 2; the first input terminal of each isolation drive circuit 3 is connected to the same-name terminal of a secondary coil of the transformer 2, and the second input terminal of each isolation drive circuit 3 is connected to the non-same-name terminal of a secondary coil of the transformer 2.

[0030] Specifically, Figure 1 In this circuit, the driving signal can be a pulse signal, a PWM signal, or other driving signal that changes its positive and negative directions within one cycle. The isolation control circuit 1 can switch the switching state according to the direction of the driving signal, thereby changing the direction of the current output to the primary coil of the transformer 2. The output voltage of the isolation control circuit 1 switches between a positive driving voltage with positive at the top and negative at the bottom, and a negative driving voltage with negative at the top and positive at the bottom. At the same time, the voltage of each secondary coil of the transformer 2 switches between positive at the top and negative at the bottom and negative at the top and positive at the bottom as the voltage of the primary coil switches. In addition to isolating the control part and the power drive part, this circuit also changes the direction of the current input to each isolation drive circuit 3.

[0031] Specifically, Figure 1In the circuit, when the isolation control circuit 1 outputs a positive drive voltage, the input voltage of the isolation drive circuit 3 is positive at the top and negative at the bottom. The n isolation drive circuits 3 output voltages (VOUT1~VOUTn) and store energy based on the input voltage. When the isolation control circuit 1 outputs a negative drive voltage, the input voltage of the isolation drive circuit 3 is negative at the top and positive at the bottom. The isolation drive circuit 3 shuts down and stops outputting the voltage. At the same time, it releases electrical energy based on the input voltage. The direction of the released electrical energy is opposite to the direction of energy storage, which generates a negative voltage signal in the circuit. This negative voltage signal controls the isolation drive circuit 3 to reliably shut down the output.

[0032] It should be noted that the design of the primary and secondary turns ratio of the transformer needs to be based on the drive voltage of the power devices used by the user. The secondary coil of the transformer can be designed with multiple paths, and each path can be connected to the same or different isolation drive circuits to achieve the function of simultaneously driving the output of multiple isolation drive voltages.

[0033] The driving circuit provided in this embodiment uses a single power supply. The driving transformer has multiple secondary coils. By switching the direction of the output voltage of the isolation control circuit, the voltage direction of the multiple secondary coils changes, thereby enabling the switching on and off of the output of each isolated driving circuit. The isolated driving circuit stores or releases energy according to the direction of the secondary coil voltage, generating positive and negative voltage outputs, ensuring that each isolated driving circuit can be reliably switched on and off, thus improving circuit reliability. Since each isolated driving circuit in this invention is connected to a separate secondary coil, and each isolated driving circuit is isolated from each other, no additional isolation chip is required, reducing circuit cost.

[0034] In some alternative implementations, such as Figure 2 As shown, the isolation control circuit 1 includes: a first switching circuit 11, a clamping circuit 12, and a first DC blocking circuit 13. The first terminal of the first switching circuit 11 is connected to the external power supply VCC and the first terminal of the clamping circuit 12. The control terminal of the first switching circuit 11 receives a drive signal. The second terminal of the first switching circuit 11 is connected to the second terminal of the clamping circuit 12 and the first terminal of the first DC blocking circuit 13. The third terminal of the first switching circuit 11 is connected to the third terminal of the clamping circuit 12 and grounded. The second terminal of the first DC blocking circuit 13 is connected to the primary coil of the transformer 2.

[0035] Specifically, Figure 2In this circuit, the first switching circuit 11 is used to switch the switching state based on the level state of the drive signal, thereby switching the voltage direction of the primary coil of the transformer 2. The clamping circuit 12 is used to prevent the switch in the first switching circuit 11 from being damaged by overvoltage. The first DC blocking circuit 13 is used to block the DC component in the circuit and prevent the transformer 2 from saturating due to DC voltage. When the drive signal switches the level state, the first switching circuit 11 switches the switching state, causing the current in the primary coil of the transformer 2 to change its direction. For example, when the drive signal is high, the current flows from the top to the bottom of the primary coil of the transformer 2, making the voltage of the primary coil positive at the top and negative at the bottom. When the drive signal is low, the current flows from the bottom to the top of the primary coil of the transformer 2, making the voltage of the primary coil negative at the top and positive at the bottom.

[0036] Specifically, Figure 2 In the first switching circuit, there are: a first resistor R1, a first switch Q1, and a second switch Q2. The first terminal of the first resistor R1 receives the drive signal, and the second terminal of the first resistor R1 is connected to the control terminals of the first switch Q1 and the second switch Q2. The first terminal of the first switch Q1 is connected to the first terminal of the clamping circuit 12, and the second terminal of the first switch Q1 is connected to the first terminal of the second switch Q2 and the second terminal of the clamping circuit 12. The second terminal of the second switch Q2 is connected to the third terminal of the clamping circuit 12. The clamping circuit 12 is composed of diodes D1 and D2 connected in series, and the first DC blocking circuit 13 is composed of resistor R2 and capacitor C1 connected in series.

[0037] Specifically, Figure 2 Taking the PWM signal as an example, when the PWM signal is high, the first switch Q1 is turned on and the second switch Q2 is turned off. The current from the external power supply VCC flows through the first switch Q1, resistor R2, and capacitor C1, and then through the primary coil of transformer 2 to GND. At this time, the external power supply VCC charges capacitor C1 and the primary coil of transformer 2. The voltage of capacitor C1 is positive on the left and negative on the right, and the voltage of the primary coil of transformer 2 is positive on top and negative on the bottom. When the PWM signal is low, the first switch Q1 is turned off and the second switch Q2 is turned on. The voltage of capacitor C1, which is positive on the left and negative on the right, flows through resistor R2, the second switch Q2, and the primary coil of transformer 2 back to capacitor C1. At this time, C1 discharges, and the voltage of the primary coil of transformer 2 is negative on top and positive on the bottom.

[0038] In some alternative implementations, such as Figure 3As shown, each isolation drive circuit includes: an output circuit 31, a second switching circuit 32, and an energy storage circuit 33. The first terminal of the output circuit 31 is connected to the same-name terminal of a secondary coil of the transformer 2; the second terminal of the output circuit 31 is connected to the control terminal of the second switching circuit 32; the third terminal of the output circuit 31 is connected to the first terminal of the second switching circuit 32 and the first terminal of the energy storage circuit 33; the fourth terminal of the output circuit 31 is connected to the second terminal of the energy storage circuit 33 and grounded; the second terminal of the second switching circuit 32 is connected to the third terminal of the energy storage circuit 33; and the fourth terminal of the energy storage circuit 33 is connected to the non-same-name terminal of a secondary coil of the transformer 2.

[0039] Specifically, Figure 3 In the circuit, the output circuit 31 is used to turn on the output based on the positive drive voltage or turn off the output based on the reverse drive voltage; the second switch circuit 32 is used to turn off based on the positive drive voltage or turn on based on the reverse drive voltage; the energy storage circuit 33 is used to store energy based on the positive drive voltage or to generate a negative voltage signal after releasing energy based on the reverse drive voltage.

[0040] Specifically, Figure 3 In the process, when the voltage of the primary coil of transformer 2 is a positive driving voltage with the upper end positive and the lower end negative, the voltage of the secondary coil is also positive with the upper end positive and the lower end negative. At this time, the second switching circuit 32 is turned off, and the voltage of the secondary coil drives the output circuit 31 to conduct and start output. At the same time, the energy storage circuit 33 stores energy based on the voltage of the secondary coil. The voltage direction of the energy storage circuit 33 is positive at the first end and negative at the fourth end.

[0041] Specifically, Figure 3 In the process, when the voltage of the primary coil of transformer 2 is a reverse driving voltage with negative at the top and positive at the bottom, the voltage of the secondary coil is also negative at the top and positive at the bottom. At this time, the second switching circuit 32 is turned on, and the charge in the output circuit 31 is discharged through the second switching circuit 32 and then quickly turned off to shut down the output. Subsequently, the electrical energy in the energy storage circuit 33 is discharged. The released electrical energy passes through the energy storage circuit 33, the second switching circuit 32, the output circuit 31, and the secondary coil of transformer 2 in sequence and then returns to the energy storage circuit 33 to form a negative voltage signal. This signal acts on the third terminal of the output circuit 31, making the voltage at the third terminal of the output circuit 31 lower than its turn-off voltage. The output circuit 31 is turned off based on the negative voltage signal.

[0042] In some alternative implementations, such as Figure 3As shown, the output circuit 31 includes: a second resistor R3, a first diode D3, and a third switch Q3. The first end of the second resistor R3 is connected to the same-named end of a secondary coil of the transformer 2, and the second end of the second resistor R3 is connected to the anode of the first diode D3 and the control terminal of the second switching circuit 32. The cathode of the first diode D3 is connected to the control terminal of the third switch Q3 and the first end of the second switching circuit 32. The first end of the third switch Q3 is connected to the second end of the energy storage circuit 33. The second switching circuit 32 includes: a fourth switch Q4 and a second diode D9. The control terminal of the fourth switch Q4 is connected to the second end of the output circuit 31, the first end of the fourth switch Q4 is connected to the third end of the output circuit 31, and the second end of the fourth switch Q4 is connected to the anode of the second diode D9. The cathode of the second diode D9 is connected to the third end of the energy storage circuit 33.

[0043] Figure 3 In the circuit, energy storage circuit 33 includes a voltage regulator unit 331 and an energy storage unit 332. The first terminal of voltage regulator unit 331 is connected to the third terminal of output circuit 31, and the second terminal of voltage regulator unit 331 is connected to both the first terminal of energy storage unit 332 and the fourth terminal of output circuit 31. The second terminal of energy storage unit 332 is connected to a non-identical terminal of a secondary coil of transformer 2. Voltage regulator unit 331 includes two Zener diodes D4 and D5 connected in reverse series. Energy storage unit 332 includes a first capacitor C2, the capacitance of which is greater than the input capacitance of the third switch Q3.

[0044] Specifically, Figure 3 In the process, when the voltage of the primary coil of transformer 2 is a positive drive voltage with the top positive and the bottom negative, the voltage of the secondary coil is also positive with the top positive and the bottom negative. At this time, the fourth switch Q4 is off, and the voltage of the secondary coil passes through the second resistor R3 and the first diode D3 in sequence to charge the gate-source capacitor of the third switch Q3. When the charging voltage reaches the opening voltage of the third switch Q3, the third switch Q3 is turned on. At the same time, the voltage of the secondary coil passes through the second resistor R3, the first diode D3, the Zener diode D4, and D5 in sequence to charge the first capacitor C2. The voltage of the first capacitor C2 is positive on the right and negative on the left.

[0045] Specifically, Figure 3In the transformer 2, when the voltage of the primary coil is a reverse drive voltage (negative at the top and positive at the bottom), the voltage of the secondary coil is also negative at the top and positive at the bottom. At this time, the fourth switch Q4 is turned on, and the gate-source charge of the third switch Q3 is discharged through the fourth switch Q4 and the second diode D9, thereby causing the third switch Q3 to turn off quickly. After the gate-source charge of the third switch Q3 is discharged, the second diode D9 is turned off. After that, the voltage of the first capacitor C2 (positive on the right and negative on the left) passes through the Zener diodes D5 and D4, the emitter to the base of the fourth switch Q4, the second resistor R3, and the secondary coil of the transformer 2 before returning to the first capacitor C2. At this time, the first capacitor C2 discharges, forming a negative voltage signal (negative at the top and positive at the bottom) on the voltage regulator unit 331 to charge the gate-source of the third switch Q3, thereby making the gate-source voltage of the third switch Q3 negative and ensuring that the third switch Q3 is reliably turned off.

[0046] In some alternative implementations, such as Figure 4 As shown, the isolation drive circuit 3 further includes a first filter circuit 34, wherein the first and second terminals of the first filter circuit 34 are respectively connected to the third and fourth terminals of the output circuit 31. The first filter circuit 34 includes a third resistor R5 and a second capacitor C4 connected in parallel.

[0047] For example, Figure 5 In the example of a PWM signal as the driving signal, when the PWM signal is high, the voltage of the primary coil of the transformer is positive at the top and negative at the bottom, and the voltage of the secondary coil of the transformer is positive at the top and negative at the bottom. The voltage of the secondary coil charges the first capacitor C2 through the second resistor R3, the first diode D3, the Zener diode D4, and D5 in sequence, or the voltage of the secondary coil charges the first capacitor C2 through the second resistor R3, the first diode D3, and the third resistor R5 in sequence.

[0048] For example, Figure 6 In the example of a PWM signal as the driving signal, when the PWM signal is low, the voltage of the primary coil of the transformer is negative at the top and positive at the bottom, and the voltage of the secondary coil of the transformer is negative at the top and positive at the bottom. The voltage of the first capacitor C2, which is positive on the right and negative on the left, passes through the emitter of the Zener diode D5, D4, the fourth switch Q4 to the base, the second resistor R3, and the secondary coil of the transformer 2 before returning to the first capacitor C2. Alternatively, the voltage of the first capacitor C2, which is positive on the right and negative on the left, passes through the emitter of the third resistor R5, the fourth switch Q4 to the base, the second resistor R3, and the secondary coil of the transformer 2 before returning to the first capacitor C2.

[0049] It should be noted that this embodiment only describes the operation of one of the isolation drive circuits. The internal structure and operation of other isolation drive circuits are the same as those in this embodiment, and will not be described again here.

[0050] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A driving device, characterized in that, The application relates to an isolation control circuit, a transformer and at least one isolation driving circuit, wherein, the transformer comprises a primary coil and at least one secondary coil; an input end of the isolation control circuit inputs a driving signal, a first power supply end of the isolation control circuit is connected with an external power supply, a second power supply end of the isolation control circuit is grounded, an output end of the isolation control circuit is connected with the primary coil of the transformer, and the isolation control circuit is used for outputting a forward driving voltage or a reverse driving voltage based on a level state of the driving signal; a first input end of each isolation driving circuit is connected with a same end of one secondary coil of the transformer, a second input end of each isolation driving circuit is connected with a non-same end of one secondary coil of the transformer, and the isolation driving circuit is used for opening output and storing energy based on the forward driving voltage, or closing output and discharging energy based on the reverse driving voltage, and then closing output based on a negative voltage signal generated by discharging. The isolation control circuit comprises a first switch circuit, a clamping circuit and a first direct-current isolation circuit, wherein, 2. The drive apparatus according to claim 1, characterized by a first end of the first switch circuit is connected with an external power supply and a first end of the clamping circuit, a control end of the first switch circuit inputs the driving signal, a second end of the first switch circuit is connected with a second end of the clamping circuit and a first end of the first direct-current isolation circuit, a third end of the first switch circuit is connected with a third end of the clamping circuit and grounded, and the first switch circuit is used for switching a switch state based on a level state of the driving signal, so as to switch a voltage direction of the primary coil of the transformer; a second end of the first direct-current isolation circuit is connected with the primary coil of the transformer. The first switch circuit comprises a first resistor, a first switch and a second switch, wherein, 3. The drive apparatus according to claim 2, characterized by a first end of the first resistor inputs the driving signal, and a second end of the first resistor is connected with a control end of the first switch and a control end of the second switch; a first end of the first switch is connected with the first end of the clamping circuit, and a second end of the first switch is connected with a first end of the second switch and the second end of the clamping circuit; a second end of the second switch is connected with the third end of the clamping circuit. Each isolation driving circuit comprises an output circuit, a second switch circuit and a storage circuit, wherein, 4. The drive apparatus according to claim 1, characterized by a first end of the output circuit is connected with a same end of one secondary coil of the transformer, a second end of the output circuit is connected with a control end of the second switch circuit, a third end of the output circuit is connected with a first end of the second switch circuit and a first end of the storage circuit, a fourth end of the output circuit is connected with a second end of the storage circuit and grounded, and the output circuit is used for opening output based on the forward driving voltage, or closing output based on the reverse driving voltage, or closing output based on the negative voltage signal; a second end of the second switch circuit is connected with a third end of the storage circuit, and the second switch circuit is used for being turned off based on the forward driving voltage, or being turned on based on the reverse driving voltage. ​ A fourth end of the energy storage circuit is connected to a non-identical end of a secondary coil of the transformer, and the energy storage circuit is used to store energy based on the forward driving voltage or generate a negative voltage signal after releasing energy based on the reverse driving voltage.

5. The drive apparatus according to claim 4, characterized by The output circuit comprises a second resistor, a first diode and a third switch, wherein, A first end of the second resistor is connected to an identical end of a secondary coil of the transformer, and a second end of the second resistor is connected to an anode of the first diode and a control end of the second switch circuit; A cathode of the first diode is connected to a control end of the third switch and a first end of the second switch circuit; A first end of the third switch is connected to a second end of the energy storage circuit.

6. The drive apparatus according to claim 4, characterized by The second switch circuit comprises a fourth switch and a second diode, wherein, A control end of the fourth switch is connected to a second end of the output circuit, a first end of the fourth switch is connected to a third end of the output circuit, and a second end of the fourth switch is connected to an anode of the second diode; A cathode of the second diode is connected to a third end of the energy storage circuit.

7. The drive apparatus according to claim 5, characterized by The energy storage circuit comprises a voltage stabilizing unit and an energy storage unit, wherein, A first end of the voltage stabilizing unit is connected to a third end of the output circuit, a second end of the voltage stabilizing unit is connected to a first end of the energy storage unit and a fourth end of the output circuit; A second end of the energy storage unit is connected to a non-identical end of a secondary coil of the transformer.

8. The driving device according to claim 7, wherein, The energy storage unit comprises a first capacitor, and a capacitance of the first capacitor is greater than an input capacitance of the third switch.

9. The drive apparatus according to claim 4, characterized by The isolation driving circuit further comprises a first filter circuit, wherein, First and second ends of the first filter circuit are respectively connected to the third and fourth ends of the output circuit.

10. The drive apparatus according to claim 9, characterized by The first filter circuit comprises: A third resistor and a second capacitor connected in parallel.

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