A high-voltage switch tube drive power supply

Abstract

The present invention relates to the technical field of drive power supplies, and particularly to a drive power supply for a high-voltage switching tube. By providing a power supply circuit, a first low-voltage drive signal generation circuit, and a second low-voltage drive signal generation circuit, the drive power supply for the high-voltage switching tube can ensure that the gate-source voltage difference when the first low-voltage drive tube is turned on is the difference between a high-voltage signal and a first power supply voltage; and the gate-source voltage difference when the second low-voltage drive tube is turned on is a second power supply voltage. That is, two switching tubes in the drive power supply can both use low-voltage drive tubes, reducing the cost and power consumption of the drive power supply and decreasing the volume of the drive power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of driving power supplies, and particularly to a driving power supply for a high-voltage switching tube. Background Art

[0002] The driving power supply for a high-voltage switching tube in the prior art needs to output a high voltage to drive a corresponding high-voltage switching tube (such as a high-voltage MOS tube, etc.). Therefore, at this time, the driving tube in the driving power supply also needs to use a suitable high-voltage tube, thereby generating a relatively high driving voltage. Therefore, the driving power supply for a high-voltage switching tube in the prior art necessarily needs to use a high-voltage driving tube with a large volume, high energy consumption, and high price. Summary of the Invention

[0003] In view of this, the present invention provides a driving power supply for a high-voltage switching tube to solve the technical problem that a high-voltage driving tube needs to be used in the driving power supply for driving a high-voltage switching tube in the prior art.

[0004] The technical solution provided by the present invention is as follows:

[0005] The first aspect of the present invention provides a driving power supply for a high-voltage switching tube, including: a power supply circuit, a first low-voltage driving signal generation circuit, a second low-voltage driving signal generation circuit, a first low-voltage driving tube, and a second low-voltage driving tube;

[0006] The power supply circuit is used to generate a first power supply voltage and a second power supply voltage. The first power supply voltage serves as the ground voltage of the first low-voltage driving signal generation circuit, and the second power supply voltage serves as the power supply voltage of the second low-voltage driving signal generation circuit; the second low-voltage driving signal generation circuit is used to receive an input signal;

[0007] When the input signal is a high-level signal, the second low-voltage driving signal generation circuit is in a first working state according to the high-level signal, and generates a low-level second low-voltage driving signal to control the second low-voltage driving tube to turn off. The first low-voltage driving signal generation circuit generates a low-level first low-voltage driving signal according to the second low-voltage driving signal generation circuit in the first working state, the high-voltage signal generated by an external power supply, and the first power supply voltage to control the first low-voltage driving tube to turn on, and the gate-source voltage difference of the first low-voltage driving tube is the difference between the high-voltage signal and the first power supply voltage;

[0008] When the input signal is a low-level signal, the second low-voltage driving signal generation circuit is in a second working state according to the low-level signal, and generates a high-level second low-voltage driving signal to control the second low-voltage driving tube to turn on, and the gate-source voltage difference of the second low-voltage driving tube is the second power supply voltage; the first low-voltage driving signal generation circuit generates a high-level first low-voltage driving signal according to the second low-voltage driving signal generation circuit in the second working state, the high-voltage signal generated by an external power supply, and the first power supply voltage to control the first low-voltage driving tube to turn off.

[0009] In an alternative embodiment, the first end of the power supply circuit is connected to an external power supply, the first end of the first low-voltage drive signal generation circuit, and the first end of the first low-voltage drive transistor. The second end of the power supply circuit is connected to the second end of the first low-voltage drive signal generation circuit. The third end of the power supply circuit is connected to the first end of the second low-voltage drive signal generation circuit. The fourth end of the power supply circuit is grounded.

[0010] The third end of the first low-voltage drive signal generation circuit is connected to the second end of the first low-voltage drive transistor. The third end of the first low-voltage drive transistor is connected to an external circuit to be driven. The fourth end of the first low-voltage drive signal generation circuit is connected to the second end of the second low-voltage drive signal generation circuit. The fifth end of the first low-voltage drive signal generation circuit is connected to the third end of the second low-voltage drive signal generation circuit.

[0011] The fourth end of the second low-voltage drive signal generation circuit receives an input signal. The fifth end of the second low-voltage drive signal generation circuit is grounded. The sixth end of the second low-voltage drive signal generation circuit is connected to the first end of the second low-voltage drive transistor. The second end of the second low-voltage drive transistor is grounded. The third end of the second low-voltage drive transistor is connected to an external circuit to be driven.

[0012] In an alternative embodiment, the power supply circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first voltage regulator diode, a second voltage regulator diode, a ninth switching transistor, and a tenth switching transistor. One end of the first resistor is connected to an external power supply, the negative electrode of the first voltage regulator diode, one end of the third resistor, and the first end of the tenth switching transistor. The other end of the first resistor is connected to the first end of the ninth switching transistor and the second end of the first low-voltage drive signal generation circuit. The second end of the ninth switching transistor is connected to the positive electrode of the first voltage regulator diode and one end of the second resistor. The third end of the ninth switching transistor is connected to the other end of the second resistor, the positive electrode of the second voltage regulator diode, one end of the fourth resistor, and is grounded. The other end of the third resistor is connected to the second end of the tenth switching transistor and the negative electrode of the second voltage regulator diode. The third end of the tenth switching transistor is connected to the other end of the fourth resistor and the first end of the second low-voltage drive signal generation circuit.

[0013] In an alternative embodiment, the first supply voltage is represented by the following formula:

[0014]

[0015] The second supply voltage is represented by the following formula:

[0016]

[0017] Wherein, HV represents the high voltage generated by the external power supply, represents the reverse breakdown voltage of the first voltage regulator diode, represents the reverse breakdown voltage of the second voltage regulator diode, represents the conduction threshold voltage of the ninth switching transistor, represents the conduction threshold voltage of the tenth switching transistor;

[0018] The reverse breakdown voltage of the first voltage regulator diode is selected according to the breakdown voltage withstand value of the first low-voltage driving transistor, and the reverse breakdown voltage of the second voltage regulator diode is selected according to the breakdown voltage withstand value of the second low-voltage driving transistor.

[0019] In an alternative embodiment, the second low-voltage driving signal generating circuit includes: a seventh inverter, an eighth inverter, a ninth inverter, a seventh switching transistor, and an eighth switching transistor. The power supply voltage of the seventh inverter, the eighth inverter, and the ninth inverter is the second supply voltage, and the ground voltage is the grounding voltage; the input terminal of the seventh inverter receives an input signal, the output terminal of the seventh inverter is connected to the input terminal of the eighth inverter, the output terminal of the eighth inverter is connected to the first terminal of the seventh switching transistor and the input terminal of the ninth inverter, the second terminal of the seventh switching transistor is grounded, the third terminal of the seventh switching transistor is connected to the fourth terminal of the first low-voltage driving signal generating circuit, the output terminal of the ninth inverter is connected to the first terminal of the eighth switching transistor and the first terminal of the second low-voltage driving transistor, the second terminal of the eighth switching transistor is grounded, and the third terminal of the eighth switching transistor is connected to the fifth terminal of the first low-voltage driving signal generating circuit.

[0020] In an alternative embodiment, the second low-voltage driving signal generating circuit further includes: a tenth inverter and an eleventh inverter. The power supply voltage of the tenth inverter and the eleventh inverter is the second supply voltage, and the ground voltage is the grounding voltage. The input terminal of the tenth inverter is connected to the first terminal of the eighth switching transistor and the output terminal of the ninth inverter, the output terminal of the tenth inverter is connected to the input terminal of the eleventh inverter, and the output terminal of the eleventh inverter is connected to the first terminal of the second low-voltage driving transistor.

[0021] In an alternative embodiment, the first low-voltage driving signal generating circuit includes: a first trigger signal generating circuit, a second trigger signal generating circuit, and a driving signal generating circuit;

[0022] The first terminal of the first trigger signal generation circuit is connected to the external power supply, the first terminal of the second trigger signal generation circuit, the first terminal of the drive signal generation circuit, and the first terminal of the first low-voltage drive transistor. The second terminal of the first trigger signal generation circuit is connected to the second terminal of the power supply circuit, the second terminal of the second trigger signal generation circuit, and the second terminal of the drive signal generation circuit. The third terminal of the first trigger signal generation circuit is connected to the second terminal of the second low-voltage drive signal generation circuit. The third terminal of the second trigger signal generation circuit is connected to the third terminal of the second low-voltage drive signal generation circuit. The fourth terminal of the first trigger signal generation circuit is connected to the fourth terminal of the second trigger signal generation circuit. The fifth terminal of the first trigger signal generation circuit is connected to the fifth terminal of the second trigger signal generation circuit. The sixth terminal of the first trigger signal generation circuit is connected to the third terminal of the drive signal generation circuit. The sixth terminal of the second trigger signal generation circuit is connected to the fourth terminal of the drive signal generation circuit. The fifth terminal of the drive signal generation circuit is connected to the second terminal of the first low-voltage drive transistor;

[0023] When the input signal is a high-level signal, based on the second low-voltage drive signal generation circuit in the first working state, the high-voltage signal generated by the external power supply, and the ground voltage, the first trigger signal generation circuit and the second trigger signal generation circuit are respectively in the third working state and the fourth working state, and the first trigger signal generation circuit generates a high-level first trigger signal, and the second trigger signal generation circuit generates a low-level second trigger signal. The drive signal generation circuit generates a low-level drive signal to the first low-voltage drive transistor according to the first trigger signal and the second trigger signal;

[0024] When the input signal is a low-level signal, based on the second low-voltage drive signal generation circuit in the second working state, the high-voltage signal generated by the external power supply, and the ground voltage, the first trigger signal generation circuit and the second trigger signal generation circuit are respectively in the fifth working state and the sixth working state, and the first trigger signal generation circuit generates a low-level first trigger signal, and the second trigger signal generation circuit generates a high-level second trigger signal. The drive signal generation circuit generates a high-level drive signal to the first low-voltage drive transistor according to the first trigger signal and the second trigger signal.

[0025] In an optional implementation manner, the first trigger signal generation circuit includes: a first switch transistor, a second switch transistor, a third switch transistor, a first inverter, and a third inverter. The power supply voltages of the first inverter and the third inverter are high-voltage signals, and the ground voltage is the first supply voltage;

[0026] The first end of the first switching tube is connected to an external power supply. The second end of the first switching tube is connected to the first end of the second switching tube, the first end of the third switching tube, and the input end of the first inverter. The third end of the first switching tube is connected to the second end of the second switching tube and the fourth end of the second trigger signal generation circuit. The third end of the second switching tube is connected to the second end of the third switching tube and the second end of the power supply circuit. The third end of the third switching tube is connected to the second end of the second low-voltage drive signal generation circuit. The output end of the first inverter is connected to the input end of the third inverter and the third end of the drive signal generation circuit. The output end of the third inverter is connected to the fifth end of the second trigger signal generation circuit;

[0027] And / or, the second trigger signal generation circuit includes a fourth switching tube, a fifth switching tube, a sixth switching tube, a second inverter, and a fourth inverter. The power supply voltage of the second inverter and the fourth inverter is a high-voltage signal, and the ground voltage is the first supply voltage;

[0028] The first end of the fourth switching tube is connected to an external power supply. The second end of the fourth switching tube is connected to the first end of the fifth switching tube, the first end of the sixth switching tube, and the input end of the fourth inverter. The third end of the fourth switching tube is connected to the second end of the fifth switching tube and the fifth end of the first trigger signal generation circuit. The third end of the fifth switching tube is connected to the second end of the sixth switching tube and the second end of the power supply circuit. The third end of the sixth switching tube is connected to the third end of the second low-voltage drive signal generation circuit. The output end of the fourth inverter is connected to the input end of the second inverter and the fourth end of the drive signal generation circuit. The output end of the second inverter is connected to the fourth end of the first trigger signal generation circuit.

[0029] In an alternative embodiment, the drive signal generation circuit includes: an RS flip-flop. The set end of the RS flip-flop is connected to the sixth end of the first trigger signal generation circuit. The reset end of the RS flip-flop is connected to the sixth end of the second trigger signal generation circuit. The in-phase output end of the RS flip-flop is connected to the second end of the first drive switching tube.

[0030] In an alternative embodiment, the drive signal generation circuit further includes: a fifth inverter and a sixth inverter. The power supply voltage of the fifth inverter and the sixth inverter is a high-voltage signal, and the ground voltage is the first supply voltage. The input end of the fifth inverter is connected to the in-phase output end of the RS flip-flop. The output end of the fifth inverter is connected to the input end of the sixth inverter. The output end of the sixth inverter is connected to the second end of the first drive switching tube.

[0031] In an alternative embodiment, the drive signal generation circuit includes an RS flip-flop and a twelfth inverter. The power supply voltage of the twelfth inverter is a high-voltage signal, and the ground voltage is the first supply voltage. The set terminal of the RS flip-flop is connected to the sixth terminal of the first trigger signal generation circuit, the reset terminal of the RS flip-flop is connected to the sixth terminal of the second trigger signal generation circuit, the inverted output terminal of the RS flip-flop is connected to the input terminal of the twelfth inverter, and the output terminal of the twelfth inverter is connected to the second terminal of the first drive switch transistor.

[0032] The technical solution of the present invention has the following advantages:

[0033] In the present invention, by providing a power supply circuit, a first low-voltage drive signal generation circuit, and a second low-voltage drive signal generation circuit, the gate-source voltage difference when the first low-voltage drive transistor is turned on can be made the difference between the high-voltage signal and the first supply voltage; the gate-source voltage difference when the second low-voltage drive transistor is turned on is the second supply voltage, that is, both switching transistors in the drive power supply can use low-voltage drive transistors, reducing the cost and power consumption of the drive power supply and decreasing the volume of the drive power supply.

[0034] In the present invention, according to the actual requirements of the circuit, the magnitudes of the first supply voltage and the second supply voltage generated by the power supply circuit can be adjusted, so as to adapt to low-voltage drive transistors with any gate-source breakdown voltage value. At the same time, the gate-source voltage differences of the low-voltage drive transistors inside the drive power supply can be made less than the high voltage, thereby reducing the gate-source breakdown voltage value, volume, and energy consumption of the drive switch transistors. At the same time, other switching transistors in the high-voltage switch transistor drive power supply can also use switching transistors with lower gate-source voltage differences, thereby reducing the cost and power consumption of the drive power supply and decreasing the volume of the drive power supply.

[0035] In the present invention, by selecting zener diodes with different reverse breakdown voltages, the adjustment of the first supply voltage and the second supply voltage can be achieved, so as to adapt to low-voltage drive transistors with any gate-source breakdown voltage value;

[0036] In the present invention, regardless of the operating state of the drive power supply, the first supply voltage and the second supply voltage are both constant values; at the same time, the supply current of the first low-voltage drive signal generation circuit flows directly from the first supply voltage terminal through the ninth switching transistor into the control system ground terminal, and the supply current of the second low-voltage drive signal generation circuit directly flows from the high-voltage terminal through the tenth switching transistor into the second supply voltage terminal. Therefore, after providing this power supply circuit, the energy consumption during the operation of the high-voltage switch transistor drive power supply can be further reduced.

[0037] In the present invention, according to the actual requirements of the circuit, an inverter can be added to the drive power supply to improve its current capacity, enabling the drive power supply to achieve high-current drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is the structural block diagram of the driving power supply for the high-voltage switching tube in the embodiment of the present invention;

[0040] Figure 2 It is the structural schematic diagram of the driving power supply for the high-voltage switching tube in the embodiment of the present invention;

[0041] Figure 3 It is the structural block diagram of the first low-voltage driving signal generation circuit in the embodiment of the present invention;

[0042] Figure 4 It is the associated waveform diagram of the input signal and the driving signal in the embodiment of the present invention;

[0043] Figure 5 It is the structural schematic diagram of the power supply circuit in the embodiment of the present invention. Specific Embodiments

[0044] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may also be the communication inside two components. It may be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] An embodiment of the present invention provides a high-voltage switch tube driving power supply, as Figure 1 shown. The driving power supply includes: a power supply circuit 10, a first low-voltage driving signal generating circuit 20, a second low-voltage driving signal generating circuit 30, a first low-voltage driving transistor Mq1, and a second low-voltage driving transistor Mq2. The power supply circuit 10 is used to generate a first power supply voltage LV1 and a second power supply voltage LV2. The first power supply voltage LV1 serves as the ground voltage of the first low-voltage driving signal generating circuit 20, and the second power supply voltage LV2 serves as the power supply voltage of the second low-voltage driving signal generating circuit 30. The second low-voltage driving signal generating circuit 30 is used to receive an input signal.

[0049] When the input signal is a high-level signal, the second low-voltage driving signal generating circuit 30 is in a first working state according to the high-level signal, and generates a low-level second low-voltage driving signal to control the second low-voltage driving transistor Mq2 to turn off. The first low-voltage driving signal generating circuit 20 generates a low-level first low-voltage driving signal according to the second low-voltage driving signal generating circuit 30 in the first working state, the high-voltage signal generated by an external power supply, and the first power supply voltage to control the first low-voltage driving transistor Mq1 to turn on, and the gate-source voltage difference of the first low-voltage driving transistor Mq1 is the difference between the high-voltage signal and the first power supply voltage LV1.

[0050] When the input signal is a low-level signal, the second low-voltage driving signal generating circuit 30 is in a second working state according to the low-level signal, and generates a high-level second low-voltage driving signal to control the second low-voltage driving transistor Mq2 to turn on, and the gate-source voltage difference of the second low-voltage driving transistor Mq2 is the second power supply voltage LV2. The first low-voltage driving signal generating circuit 20 generates a high-level first low-voltage driving signal according to the second low-voltage driving signal generating circuit 30 in the second working state, the high-voltage signal generated by an external power supply, and the first power supply voltage to control the first low-voltage driving transistor Mq1 to turn off.

[0051] Among them, the first end of the power supply circuit 10 is connected to an external power supply, the first end of the first low-voltage drive signal generation circuit 20, and the first end of the first low-voltage drive transistor Mq1. The second end of the power supply circuit 10 is connected to the second end of the first low-voltage drive signal generation circuit 20. The third end of the power supply circuit 10 is connected to the first end of the second low-voltage drive signal generation circuit 30. The fourth end of the power supply circuit 10 is grounded.

[0052] The third end of the first low-voltage drive signal generation circuit 20 is connected to the second end of the first low-voltage drive transistor Mq1. The third end of the first low-voltage drive transistor Mq1 is connected to an external circuit to be driven 50. The fourth end of the first low-voltage drive signal generation circuit 20 is connected to the second end of the second low-voltage drive signal generation circuit 30. The fifth end of the first low-voltage drive signal generation circuit 20 is connected to the third end of the second low-voltage drive signal generation circuit 30.

[0053] The fourth end of the second low-voltage drive signal generation circuit 30 receives an input signal IN. The fifth end of the second low-voltage drive signal generation circuit 30 is grounded. The sixth end of the second low-voltage drive signal generation circuit 30 is connected to the first end of the second low-voltage drive transistor Mq2. The second end of the second low-voltage drive transistor Mq2 is grounded. The third end of the second low-voltage drive transistor Mq2 is connected to an external circuit to be driven 50.

[0054] Specifically, in this high-voltage switch transistor drive power supply, a power supply circuit, a first low-voltage drive signal generation circuit, and a second low-voltage drive signal generation circuit are provided. The two low-voltage drive signal generation circuits respectively control the two low-voltage drive transistors to conduct or turn off based on a high-voltage signal provided by an external power supply and a power supply voltage provided by the power supply circuit. Although a high-voltage signal generated by an external power supply is also used in this drive power supply, the two drive transistors are not directly driven by this high voltage. Among them, when driving the first low-voltage drive transistor to conduct, the gate-source voltage difference of the first low-voltage drive transistor is made to be the difference between the high-voltage signal and the first power supply voltage through the settings of the power supply circuit and the first low-voltage drive signal generation circuit. When driving the second low-voltage drive transistor to conduct, the gate-source voltage difference of the second low-voltage drive transistor is made to be the second power supply voltage through the settings of the power supply circuit and the second low-voltage drive signal generation circuit. In practical applications, by adjusting the parameters of the power supply circuit, the gate-source voltage differences of both can be made less than the high-voltage signal, that is, both low-voltage drive transistors can use switch transistors with a lower breakdown voltage. At the same time, when the first low-voltage drive transistor conducts, the high-voltage signal provided by the external power supply can also be introduced into the external circuit to be driven to drive the high-voltage switch transistor in the external circuit to be driven. This external circuit to be driven can be an external power circuit or other circuits as long as it includes the high-voltage switch transistor to be driven.

[0055] Therefore, in the present invention, by providing a power supply circuit, a first low-voltage driving signal generation circuit, and a second low-voltage driving signal generation circuit, the gate-source voltage difference when the first low-voltage driving transistor is turned on can be the difference between the high-voltage signal and the first power supply voltage; the gate-source voltage difference when the second low-voltage driving transistor is turned on can be the second power supply voltage. That is, both switching transistors in this driving power supply can use low-voltage driving transistors, reducing the cost and power consumption of the driving power supply and decreasing the volume of the driving power supply.

[0056] In an alternative embodiment, as Figure 2 shown, the second low-voltage driving signal generation circuit includes: a seventh inverter A7, an eighth inverter A8, a ninth inverter A9, a seventh switching transistor M7, and an eighth switching transistor M8. The power supply voltage of the seventh inverter A7, the eighth inverter A8, and the ninth inverter A9 is the second power supply voltage LV2, and the ground voltage is the grounding voltage; the input terminal of the seventh inverter A7 receives an input signal, the output terminal of the seventh inverter A7 is connected to the input terminal of the eighth inverter A8, the output terminal of the eighth inverter A8 is connected to the first terminal of the seventh switching transistor M7 and the input terminal of the ninth inverter A9, the second terminal of the seventh switching transistor M7 is grounded, the third terminal of the seventh switching transistor M7 is connected to the fourth terminal of the first low-voltage driving signal generation circuit, the output terminal of the ninth inverter A9 is connected to the first terminal of the eighth switching transistor M8 and the first terminal of the second low-voltage driving transistor Mq2, the second terminal of the eighth switching transistor M8 is grounded, and the third terminal of the eighth switching transistor M8 is connected to the fifth terminal of the first low-voltage driving signal generation circuit.

[0057] According to actual requirements, the second low-voltage driving signal generation circuit further includes: a tenth inverter A10 and an eleventh inverter A11. The power supply voltage of the tenth inverter A10 and the eleventh inverter A11 is the second power supply voltage LV2, and the ground voltage is the grounding voltage. The input terminal of the tenth inverter A10 is connected to the first terminal of the eighth switching transistor M8 and the output terminal of the ninth inverter A9, the output terminal of the tenth inverter A10 is connected to the input terminal of the eleventh inverter A11, and the output terminal of the eleventh inverter A11 is connected to the first terminal of the second low-voltage driving transistor Mq2. Specifically, in practical applications, when there are special requirements for the turn-on and turn-off times of the high-voltage switching transistor in the externally to-be-driven circuit and a large-current drive is required from this driving power supply, in addition to changing the breakdown voltage capability of the second low-voltage driving transistor Mq2, inverters can also be added to the circuit to improve the current capability of this driving power supply.

[0058] Specifically, the second low-voltage drive signal generation circuit uses the second supply voltage LV2 as the power supply voltage and the ground voltage as the ground voltage. That is to say, in the second low-voltage drive signal generation circuit, the power supply voltage of multiple inverters is the second supply voltage LV2, and the ground voltage is the ground voltage. For an inverter, the power supply voltage and the ground voltage determine its logic swing, that is, when the inverter outputs a high level, it is close to the power supply voltage, and when it outputs a low level, it is close to the ground voltage. Further, whether the inverter can change the level of its input signal is also related to its flip threshold voltage. Usually, the flip threshold voltage of an inverter is close to half of the power supply voltage.

[0059] Based on this, taking the second low-voltage drive signal generation circuit including the tenth inverter A10 and the eleventh inverter A11 as an example, the working principle of the second low-voltage drive signal generation circuit is described as follows:

[0060] When the input signal is a high-level signal greater than the flip threshold voltage of the seventh inverter A7, the input signal passing through the seventh inverter A7 is inverted, that is, the seventh inverter A7 outputs a low-level signal, the eighth inverter A8 outputs a high-level signal, the ninth inverter A9 outputs a low-level signal, the tenth inverter A10 outputs a high-level signal, and the eleventh inverter A11 outputs a low-level signal. At the same time, the high-level signal output by the eighth inverter A8 makes the seventh switch tube M7 conduct, the low-level signal output by the ninth inverter A9 makes the eighth switch tube M8 turn off, and the low-level signal output by the eleventh inverter A11 makes the second low-voltage drive tube Mq2 turn off. That is, when the second low-voltage drive signal generation circuit is in the first working state, the seventh switch tube M7 conducts and the eighth switch tube M8 turns off.

[0061] When the input signal is a low-level signal less than the flip threshold voltage of the seventh inverter A7, the input signal passing through the seventh inverter A7 is inverted, that is, the seventh inverter A7 outputs a high-level signal, the eighth inverter A8 outputs a low-level signal, the ninth inverter A9 outputs a high-level signal, the tenth inverter A10 outputs a low-level signal, and the eleventh inverter A11 outputs a high-level signal. At the same time, the low-level signal output by the eighth inverter A8 makes the seventh switch tube M7 turn off, the high-level signal output by the ninth inverter A9 makes the eighth switch tube M8 conduct, and the high-level signal output by the eleventh inverter A11 makes the second low-voltage drive tube Mq2 conduct. That is, when the second low-voltage drive signal generation circuit is in the second working state, the seventh switch tube M7 turns off and the eighth switch tube M8 conducts.

[0062] In an alternative embodiment, as Figure 3 shown, the first low-voltage drive signal generation circuit 20 includes: a first trigger signal generation circuit 21, a second trigger signal generation circuit 22, and a drive signal generation circuit 23;

[0063] The first terminal of the first trigger signal generation circuit 21 is connected to the external power supply, the first terminal of the second trigger signal generation circuit 22, the first terminal of the drive signal generation circuit 23, and the first terminal of the first low-voltage drive transistor Mq1. The second terminal of the first trigger signal generation circuit 21 is connected to the second terminal of the power supply circuit, the second terminal of the second trigger signal generation circuit 22, and the second terminal of the drive signal generation circuit 23. The third terminal of the first trigger signal generation circuit 21 is connected to the second terminal of the second low-voltage drive signal generation circuit 30. The third terminal of the second trigger signal generation circuit 22 is connected to the third terminal of the second low-voltage drive signal generation circuit 30. The fourth terminal of the first trigger signal generation circuit 21 is connected to the fourth terminal of the second trigger signal generation circuit 22. The fifth terminal of the first trigger signal generation circuit 21 is connected to the fifth terminal of the second trigger signal generation circuit 22. The sixth terminal of the first trigger signal generation circuit 21 is connected to the third terminal of the drive signal generation circuit 23. The sixth terminal of the second trigger signal generation circuit 22 is connected to the fourth terminal of the drive signal generation circuit 23. The fifth terminal of the drive signal generation circuit 23 is connected to the second terminal of the first low-voltage drive transistor Mq1;

[0064] When the input signal is a high-level signal, based on the second low-voltage drive signal generation circuit 30 in the first working state, the high-voltage signal generated by the external power supply, and the ground voltage, the first trigger signal generation circuit 21 and the second trigger signal generation circuit 22 are respectively in the third working state and the fourth working state, and the first trigger signal generation circuit 21 generates a high-level first trigger signal, and the second trigger signal generation circuit 22 generates a low-level second trigger signal. The drive signal generation circuit 23 generates a low-level drive signal to the first low-voltage drive transistor Mq1 according to the first trigger signal and the second trigger signal;

[0065] When the input signal is a low-level signal, based on the second low-voltage drive signal generation circuit 30 in the second working state, the high-voltage signal generated by the external power supply, and the ground voltage, the first trigger signal generation circuit 21 and the second trigger signal generation circuit 22 are respectively in the fifth working state and the sixth working state, and the first trigger signal generation circuit 21 generates a low-level first trigger signal, and the second trigger signal generation circuit 22 generates a high-level second trigger signal. The drive signal generation circuit 23 generates a high-level drive signal to the first low-voltage drive transistor Mq1 according to the first trigger signal and the second trigger signal.

[0066] Specifically, as Figure 2 shown, the first trigger signal generation circuit 21 includes: a first switch transistor M1, a second switch transistor M2, a third switch transistor M3, a first inverter A1, and a third inverter A3. The power supply voltages of the first inverter A1 and the third inverter A3 are high-voltage signals, and the ground voltage is the first supply voltage;

[0067] The first terminal of the first switching transistor M1 is connected to an external power supply. The second terminal of the first switching transistor M1 is connected to the first terminal of the second switching transistor M2, the first terminal of the third switching transistor M3, and the input terminal of the first inverter A1. The third terminal of the first switching transistor M1 is connected to the second terminal of the second switching transistor M2 and the fourth terminal of the second trigger signal generating circuit 22. The third terminal of the second switching transistor M2 is connected to the second terminal of the third switching transistor M3 and the second terminal of the power supply circuit. The third terminal of the third switching transistor M3 is connected to the second terminal of the second low-voltage driving signal generating circuit 30. The output terminal of the first inverter A1 is connected to the input terminal of the third inverter A3 and the third terminal of the driving signal generating circuit 23. The output terminal of the third inverter A3 is connected to the fifth terminal of the second trigger signal generating circuit 22;

[0068] And / or, the second trigger signal generating circuit 22 includes a fourth switching transistor M4, a fifth switching transistor M5, a sixth switching transistor M6, a second inverter A2, and a fourth inverter A4. The power supply voltage of the second inverter A2 and the fourth inverter A4 is a high-voltage signal, and the ground voltage is the first supply voltage;

[0069] The first terminal of the fourth switching transistor M4 is connected to an external power supply. The second terminal of the fourth switching transistor M4 is connected to the first terminal of the fifth switching transistor M5, the first terminal of the sixth switching transistor M6, and the input terminal of the fourth inverter A4. The third terminal of the fourth switching transistor M4 is connected to the second terminal of the fifth switching transistor M5 and the fifth terminal of the first trigger signal generating circuit 21. The third terminal of the fifth switching transistor M5 is connected to the second terminal of the sixth switching transistor M6 and the second terminal of the power supply circuit. The third terminal of the sixth switching transistor M6 is connected to the third terminal of the second low-voltage driving signal generating circuit 30. The output terminal of the fourth inverter A4 is connected to the input terminal of the second inverter A2 and the fourth terminal of the driving signal generating circuit 23. The output terminal of the second inverter A2 is connected to the fourth terminal of the first trigger signal generating circuit 21.

[0070] Specifically, the driving signal generating circuit 23 includes: an RS flip-flop B1. The set terminal of the RS flip-flop B1 is connected to the sixth terminal of the first trigger signal generating circuit 21. The reset terminal of the RS flip-flop B1 is connected to the sixth terminal of the second trigger signal generating circuit 22. The in-phase output terminal of the RS flip-flop B1 is connected to the second terminal of the first driving switching transistor. Additionally, in addition to this connection method, a twelfth inverter can also be connected between the inverted output terminal of the RS flip-flop B1 and the first driving switching transistor to achieve the same function.

[0071] Specifically, the drive signal generation circuit 23 further includes: a fifth inverter A5 and a sixth inverter A6. The power supply voltage of the fifth inverter A5 and the sixth inverter A6 is a high voltage signal, and the ground voltage is the first supply voltage. The input terminal of the fifth inverter A5 is connected to the non-inverting output terminal of the RS flip-flop B1. The output terminal of the fifth inverter A5 is connected to the input terminal of the sixth inverter A6. The output terminal of the sixth inverter A6 is connected to the second terminal of the first drive switch tube. Similar to the first low-voltage drive signal generation circuit 20, in practical applications, when there are special requirements for the conduction and turn-off time of the high-voltage switch tube in the external circuit to be driven, it is necessary for this drive power supply to output a large-current drive. At this time, in addition to changing the breakdown voltage resistance of the first low-voltage drive transistor Mq1, an inverter can also be added to the circuit to improve the current capacity of this drive power supply.

[0072] Taking the first low-voltage drive signal generation circuit 20 including the fifth inverter A5 and the sixth inverter A6 as an example, the working principle of the first low-voltage drive signal generation circuit 20 will be described as follows:

[0073] When the second low-voltage drive signal generation circuit 30 is in the first working state, that is, the seventh switch tube is conducting and the eighth switch tube is turned off, the conducting seventh switch tube pulls down the drain of the third switch tube M3. At the same time, the first supply voltage generated by the power supply circuit is input to the gate of the third switch tube M3. Then the third switch tube M3 operates in the saturation region, and a current flowing from the source to the drain is generated inside it. Therefore, the source voltage of the third switch tube M3 (voltage at point A) is pulled down. Also, since the gate voltage of the third switch tube M3 is the first supply voltage, the source voltage of the third switch tube M3 is clamped at VGS3 + LV1, where VGS3 is the gate-source voltage difference of the third switch tube M3. And, the ground voltage of the first inverter A1 is the first supply voltage. Therefore, if the switching threshold voltage of the first inverter A1 is designed to be greater than the gate-source voltage difference of the third switch tube M3, the input voltage of the first inverter A1, that is, the voltage at point A, is a low-level signal. The output voltage of the first inverter A1 is a high-level signal, the output voltage of the third inverter A3 is a low-level signal, and this low-level signal is input to the gate of the fifth switch tube M5, making the fifth switch tube M5 in the off state. At the same time, the fourth switch tube M4 is made to conduct, and the eighth switch tube is in the off state, then the sixth switch tube M6 is also in the off state. Thus, the input voltage of the fourth inverter A4 is pulled up through the fourth switch tube M4, and the fourth inverter A4 outputs a low-level signal. The second inverter A2 outputs a high-level signal, and this high-level signal makes the second switch tube M2 conduct and the first switch tube M1 turn off, thereby further pulling down the voltage at point A to the first supply voltage.

[0074] Based on the above analysis, when the input signal is a high-level signal and the second low-voltage drive signal generation circuit 30 is in the first working state, the first inverter A1 outputs a high-level signal to the set terminal of the RS flip-flop B1, and the fourth inverter A4 outputs a low-level signal to the reset terminal of the RS flip-flop B1. Thus, a low-level signal is output from the in-phase output terminal of the RS flip-flop B1. After the current driving ability of this low-level signal is enhanced by the fifth inverter A5 and the sixth inverter A6, a low-level signal with a stronger input current driving ability is input to the first low-voltage drive transistor Mq1, causing the first low-voltage drive transistor Mq1 to conduct. At the same time, when the second low-voltage drive signal is in the first working state, the second low-voltage drive transistor Mq2 is turned off. Therefore, the drive signal output by the high-voltage switch transistor drive power supply is pulled up to the high voltage generated by the external power supply by the first low-voltage drive transistor Mq1.

[0075] Moreover, the gate voltage of the first low-voltage drive transistor Mq1 is the low-level signal output by the sixth inverter A6 (according to the above analysis, this low-level signal is the ground voltage of the sixth inverter A6, that is, the first supply voltage), and the source voltage of the first low-voltage drive transistor Mq1 is a high-voltage signal. Therefore, the gate-source voltage difference of the first low-voltage drive transistor Mq1 is the difference between the high-voltage signal and the first supply voltage, and the second low-voltage drive transistor is turned off, and its gate-source voltage difference is 0. Further, when there are no special requirements for the on-off time of the high-voltage switch transistor of the external circuit to be driven, small-current drive can be adopted. Therefore, at this time, the first low-voltage drive transistor Mq1 with a small breakdown voltage can be used. When there are special requirements for the on-off time of the high-voltage switch transistor of the external circuit to be driven, relatively large-current drive is required. Therefore, at this time, the first low-voltage drive transistor Mq1 with a large breakdown voltage can be used. Therefore, the magnitude of the first supply voltage generated by the power supply circuit can be adjusted according to the actual requirements of the circuit, so as to adapt to low-voltage drive transistors with any breakdown voltage value.

[0076] When the second low-voltage driving signal generating circuit 30 is in the second working state, that is, the seventh switching tube is turned off and the eighth switching tube is turned on, the turned-on eighth switching tube pulls down the drain of the sixth switching tube M6. At the same time, the first supply voltage generated by the power supply circuit is input to the gate of the sixth switching tube M6. Then, the sixth switching tube M6 operates in the saturation region, and a current flowing from the source to the drain is generated inside it. Therefore, the source voltage of the sixth switching tube M6 (the voltage at point B) is pulled down. Also, since the gate voltage of the sixth switching tube M6 is the first supply voltage, the source voltage of the sixth switching tube M6 is clamped at VGS6 + LV1, where VGS6 is the gate-source voltage difference of the sixth switching tube M6. And, the ground voltage of the fourth inverter A4 is the first supply voltage. Therefore, if the flip-flop threshold voltage of the fourth inverter A4 is designed to be greater than the gate-source voltage difference of the sixth switching tube M6, the input voltage of the fourth inverter A4, that is, the voltage at point B, is a low-level signal. The output voltage of the fourth inverter A4 is a high-level signal, and the output voltage of the second inverter A2 is a low-level signal. This low-level signal is input to the gate of the second switching tube M2, making the second switching tube M2 turn off. At the same time, the first switching tube M1 is turned on, and the seventh switching tube is turned off, then the third switching tube M3 is also turned off. Thus, the input voltage of the first inverter A1 is pulled up through the first switching tube M1, and the first inverter A1 outputs a low-level signal, and the third inverter A3 outputs a high-level signal. This high-level signal makes the fifth switching tube M5 turn on and the fourth switching tube M4 turn off, thereby further pulling down the voltage at point B to the first supply voltage.

[0077] Based on the above analysis, it can be seen that when the input signal is a low-level signal and the second low-voltage driving signal generating circuit 30 is in the second working state, the first inverter A1 outputs a low-level signal to the set terminal of the RS flip-flop B1, and the fourth inverter A4 outputs a high-level signal to the reset terminal of the RS flip-flop B1. Thus, the non-inverting output terminal of the RS flip-flop B1 outputs a high-level signal. After the current driving ability is enhanced through the fifth inverter A5 and the sixth inverter A6, a high-level signal with a stronger current driving ability is input to the first low-voltage driving tube Mq1, making the first low-voltage driving tube Mq1 turn off. At the same time, when the second low-voltage driving signal is in the second working state, the second low-voltage driving tube is turned on. Therefore, the driving signal output by the high-voltage switching tube driving power supply is pulled down to the ground voltage by the second low-voltage driving tube.

[0078] Moreover, the gate voltage of the second low-voltage driving transistor is the high-level signal output by the eleventh inverter (as can be seen from the above analysis, this high-level signal is the power supply voltage of the eleventh inverter, i.e., the second supply voltage), and the source voltage of the second low-voltage driving transistor is the ground voltage. Therefore, the gate-source voltage difference of the second low-voltage driving transistor is the second supply voltage, and the first low-voltage driving transistor Mq1 is turned off, and its gate-source voltage difference is 0. Further, when there are no special requirements for the conduction and turn-off times of the high-voltage switching transistor of the external circuit to be driven, small-current driving can be adopted. Therefore, at this time, a second low-voltage driving transistor with a small breakdown voltage can be used. When there are special requirements for the conduction and turn-off times of the high-voltage switching transistor of the external circuit to be driven, relatively large-current driving is required. Therefore, at this time, a second low-voltage driving transistor with a large breakdown voltage can be used. Therefore, according to the actual requirements of the circuit, the magnitude of the second supply voltage generated by the power supply circuit can be adjusted to adapt to low-voltage driving transistors with any breakdown voltage value.

[0079] As Figure 4 shown, it is the correlation waveform diagram of the input signal IN and the driving signal OT. Among them, the high-level voltage of the input signal IN is LV2, and the high-level voltage of the driving signal OT reaches the high voltage HV. Therefore, this high-voltage switching transistor drives the input signal with a low voltage and outputs the driving signal with a high voltage to drive the high-voltage switching transistor of the external circuit to be driven.

[0080] In an alternative embodiment, as Figure 5 shown, the power supply circuit includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first voltage-regulator diode D1, a second voltage-regulator diode D2, a ninth switching transistor M9, and a tenth switching transistor M10;

[0081] One end of the first resistor R1 is connected to the external power supply, the negative electrode of the first voltage-regulator diode D1, one end of the third resistor R3, and the first end of the tenth switching transistor M10. The other end of the first resistor R1 is connected to the first end of the ninth switching transistor M9 and the second end of the first low-voltage driving signal generation circuit. The second end of the ninth switching transistor M9 is connected to the positive electrode of the first voltage-regulator diode D1 and one end of the second resistor R2. The third end of the ninth switching transistor M9 is connected to the other end of the second resistor R2, the positive electrode of the second voltage-regulator diode D2, one end of the fourth resistor R4 and grounded; the other end of the third resistor R3 is connected to the second end of the tenth switching transistor M10 and the negative electrode of the second voltage-regulator diode D2. The third end of the tenth switching transistor M10 is connected to the other end of the fourth resistor R4 and the first end of the second low-voltage driving signal generation circuit. Among them, the reverse breakdown voltage of the first voltage-regulator diode D1 is VD1, the reverse breakdown voltage of the second voltage-regulator diode D2 is VD2, and , , VTH9 is the conduction threshold voltage of the ninth switching transistor M9, and VTH10 is the conduction threshold voltage of the tenth switching transistor M10.

[0082] According to the structure of this power supply circuit, its working principle is as follows:

[0083] When the circuit is powered on, a high-voltage signal is input into the power supply circuit. Since the high-voltage signal is higher than the reverse breakdown voltage VD1 of the first voltage regulator diode D1 and the reverse breakdown voltage VD2 of the second voltage regulator diode D2, both the first voltage regulator diode D1 and the second voltage regulator diode D2 are broken down. At this time, the gate voltage of the ninth switching transistor M9 is equal to , and since the source voltage of the ninth switching transistor M9 is HV, and , it can be obtained that the gate-source voltage difference of the ninth switching transistor M9 is greater than the conduction threshold voltage of the ninth switching transistor M9, and the ninth switching transistor M9 conducts. At this time, the source voltage of the ninth switching transistor M9, that is, the first supply voltage LV1, is clamped at ; at the same time, the gate voltage of the tenth switching transistor M10 is equal to , and since the source voltage of the tenth switching transistor M10 is GND, and , it can be obtained that the gate-source voltage difference of the tenth switching transistor M10 is greater than the conduction threshold voltage of the tenth switching transistor M10, and the tenth switching transistor M10 conducts. At this time, the source voltage of the tenth switching transistor M10, that is, the second supply voltage LV2, is clamped at .

[0084] It can be seen from the above analysis that when the input signal is at a high level, the gate-source voltage difference of the first low-voltage driving transistor Mq1 is , and the gate-source voltage difference of the second low-voltage driving transistor Mq2 is 0; when the input signal is at a low level, the gate-source voltage difference of the first low-voltage driving transistor Mq1 is 0, and the gate-source voltage difference of the second low-voltage driving transistor Mq2 is . Therefore, no matter what working state the driving power supply is in, the gate-source voltage difference of the low-voltage driving transistors is very low, far lower than the high voltage HV. Therefore, the first low-voltage driving transistor Mq1 and the second low-voltage driving transistor Mq2 can use switching transistors with a low gate-source voltage difference. Similarly, other switching transistors in this high-voltage switching transistor driving power supply can also use switching transistors with a low gate-source voltage difference.

[0085] Meanwhile, by selecting zener diodes with different reverse breakdown voltages, the regulation of the first supply voltage LV1 and the second supply voltage LV2 can be achieved. Moreover, since the threshold voltage of the MOS transistor remains constant after it is turned on, at this time, regardless of the operating state of the driving power supply, the first supply voltage LV1 and the second supply voltage LV2 are both constant values. At the same time, the supply current of the first low-voltage driving signal generation circuit flows directly from the first supply voltage terminal (i.e., the source of the ninth switching transistor M9) through the ninth switching transistor M9 into the control system ground terminal, and the supply current of the second low-voltage driving signal generation circuit directly flows from the high-voltage terminal through the tenth switching transistor M10 into the second supply voltage terminal (i.e., the source of the tenth switching transistor M10). Therefore, after setting this power supply circuit, the energy consumption during the operation of the high-voltage switching transistor driving power supply can be further reduced.

[0086] It should be noted that the switching transistors in the above circuit can be MOS transistors, and the low-voltage driving transistors refer to the driving transistors with relatively low gate-source breakdown voltage.

[0087] Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions, and modifications to these embodiments without departing from the spirit of the present invention and the protection scope defined by the appended claims. Such modifications and variations fall within the scope defined by the appended claims. For other examples, those of ordinary skill in the art should easily understand that the order of the process steps can be changed while maintaining the protection scope of the present invention.

[0088] In addition, the application scope of the present invention is not limited to the processes, mechanisms, manufacturing, compositions of matter, means, methods, and steps of the specific embodiments described in the specification. From the disclosure of the present invention, those of ordinary skill in the art will easily understand that for the processes, mechanisms, manufacturing, compositions of matter, means, methods, or steps that already exist or will be developed in the future, if they perform substantially the same functions or achieve substantially the same results as the corresponding embodiments described in the present invention, they can be applied in accordance with the present invention. Therefore, the appended claims of the present invention are intended to include these processes, mechanisms, manufacturing, compositions of matter, means, methods, or steps within their protection scope.

Claims

1. A high-voltage switch tube drive power supply, characterized in that Including: A power supply circuit, a first low-voltage drive signal generation circuit, a second low-voltage drive signal generation circuit, a first low-voltage drive transistor, and a second low-voltage drive transistor; The power supply circuit is used to generate a first power supply voltage and a second power supply voltage. The first power supply voltage serves as the ground voltage of the first low-voltage drive signal generation circuit, and the second power supply voltage serves as the power supply voltage of the second low-voltage drive signal generation circuit; The second low-voltage drive signal generation circuit is used to receive an input signal; When the input signal is a high-level signal, the second low-voltage drive signal generation circuit is in a first operating state according to the high-level signal and generates a low-level second low-voltage drive signal to control the second low-voltage drive transistor to turn off. The first low-voltage drive signal generation circuit generates a low-level first low-voltage drive signal according to the second low-voltage drive signal generation circuit in the first operating state, the high-voltage signal generated by the external power supply, and the first power supply voltage to control the first low-voltage drive transistor to turn on, and the gate-source voltage difference of the first low-voltage drive transistor is the difference between the high-voltage signal and the first power supply voltage; When the input signal is a low-level signal, the second low-voltage drive signal generation circuit is in a second operating state according to the low-level signal and generates a high-level second low-voltage drive signal to control the second low-voltage drive transistor to turn on, and the gate-source voltage difference of the second low-voltage drive transistor is the second power supply voltage; The first low-voltage drive signal generation circuit generates a high-level first low-voltage drive signal according to the second low-voltage drive signal generation circuit in the second operating state, the high-voltage signal generated by the external power supply, and the first power supply voltage to control the first low-voltage drive transistor to turn off.

2. The high-voltage switch transistor drive power supply according to claim 1, wherein: The first end of the power supply circuit is connected to the external power supply, the first end of the first low-voltage drive signal generation circuit, and the first end of the first low-voltage drive transistor. The second end of the power supply circuit is connected to the second end of the first low-voltage drive signal generation circuit. The third end of the power supply circuit is connected to the first end of the second low-voltage drive signal generation circuit. The fourth end of the power supply circuit is grounded; The third end of the first low-voltage drive signal generation circuit is connected to the second end of the first low-voltage drive transistor. The third end of the first low-voltage drive transistor is connected to the external circuit to be driven. The fourth end of the first low-voltage drive signal generation circuit is connected to the second end of the second low-voltage drive signal generation circuit. The fifth end of the first low-voltage drive signal generation circuit is connected to the third end of the second low-voltage drive signal generation circuit; The fourth end of the second low-voltage drive signal generation circuit receives the input signal. The fifth end of the second low-voltage drive signal generation circuit is grounded. The sixth end of the second low-voltage drive signal generation circuit is connected to the first end of the second low-voltage drive transistor. The second end of the second low-voltage drive transistor is grounded. The third end of the second low-voltage drive transistor is connected to the external circuit to be driven.

3. The high-voltage switch tube driving power supply according to claim 1, wherein The power supply circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first voltage regulator diode, a second voltage regulator diode, a ninth switch transistor, and a tenth switch transistor; One end of the first resistor is connected to an external power supply, the negative electrode of the first voltage stabilizing diode, one end of the third resistor, and the first end of the tenth switching tube. The other end of the first resistor is connected to the first end of the ninth switching tube and the second end of the first low-voltage driving signal generating circuit. The second end of the ninth switching tube is connected to the positive electrode of the first voltage stabilizing diode and one end of the second resistor. The third end of the ninth switching tube is connected to the other end of the second resistor, the positive electrode of the second voltage stabilizing diode, one end of the fourth resistor, and grounded. The other end of the third resistor is connected to the second end of the tenth switching tube and the negative electrode of the second voltage stabilizing diode. The third end of the tenth switching tube is connected to the other end of the fourth resistor and the first end of the second low-voltage driving signal generating circuit.

4. The high-voltage switch tube driving power supply according to claim 3, characterized in that The first supply voltage is represented by the following formula: The second supply voltage is represented by the following formula: Wherein, HV represents the high voltage generated by an external power supply, represents the reverse breakdown voltage of the first voltage regulator diode, represents the reverse breakdown voltage of the second voltage regulator diode, represents the conduction threshold voltage of the ninth switching transistor, represents the conduction threshold voltage of the tenth switching transistor; The reverse breakdown voltage of the first voltage stabilizing diode is selected according to the breakdown voltage of the first low-voltage driving tube, and the reverse breakdown voltage of the second voltage stabilizing diode is selected according to the breakdown voltage of the second low-voltage driving tube.

5. The high-voltage switch tube driving power supply according to claim 2, characterized in that The second low-voltage driving signal generating circuit includes: a seventh inverter, an eighth inverter, a ninth inverter, a seventh switching tube, and an eighth switching tube. The power supply voltage of the seventh inverter, the eighth inverter, and the ninth inverter is the second supply voltage, and the ground voltage is the grounded voltage. The input terminal of the seventh inverter receives an input signal. The output terminal of the seventh inverter is connected to the input terminal of the eighth inverter. The output terminal of the eighth inverter is connected to the first end of the seventh switching tube and the input terminal of the ninth inverter. The second end of the seventh switching tube is grounded. The third end of the seventh switching tube is connected to the fourth end of the first low-voltage driving signal generating circuit. The output terminal of the ninth inverter is connected to the first end of the eighth switching tube and the first end of the second low-voltage driving tube. The second end of the eighth switching tube is grounded. The third end of the eighth switching tube is connected to the fifth end of the first low-voltage driving signal generating circuit.

6. The high-voltage switch tube driving power supply according to claim 5, characterized in that The second low-voltage driving signal generating circuit further includes: a tenth inverter and an eleventh inverter. The power supply voltage of the tenth inverter and the eleventh inverter is the second supply voltage, and the ground voltage is the grounded voltage. The input terminal of the tenth inverter is connected to the first end of the eighth switching tube and the output terminal of the ninth inverter. The output terminal of the tenth inverter is connected to the input terminal of the eleventh inverter. The output terminal of the eleventh inverter is connected to the first end of the second low-voltage driving tube.

7. The high-voltage switch tube driving power supply according to claim 1, characterized in that The first low-voltage driving signal generating circuit includes: a first trigger signal generating circuit, a second trigger signal generating circuit, and a driving signal generating circuit; The first terminal of the first trigger signal generation circuit is connected to the external power supply, the first terminal of the second trigger signal generation circuit, the first terminal of the drive signal generation circuit, and the first terminal of the first low-voltage drive transistor. The second terminal of the first trigger signal generation circuit is connected to the second terminal of the power supply circuit, the second terminal of the second trigger signal generation circuit, and the second terminal of the drive signal generation circuit. The third terminal of the first trigger signal generation circuit is connected to the second terminal of the second low-voltage drive signal generation circuit. The third terminal of the second trigger signal generation circuit is connected to the third terminal of the second low-voltage drive signal generation circuit. The fourth terminal of the first trigger signal generation circuit is connected to the fourth terminal of the second trigger signal generation circuit. The fifth terminal of the first trigger signal generation circuit is connected to the fifth terminal of the second trigger signal generation circuit. The sixth terminal of the first trigger signal generation circuit is connected to the third terminal of the drive signal generation circuit. The sixth terminal of the second trigger signal generation circuit is connected to the fourth terminal of the drive signal generation circuit. The fifth terminal of the drive signal generation circuit is connected to the second terminal of the first low-voltage drive transistor; When the input signal is a high-level signal, based on the second low-voltage drive signal generation circuit in the first working state, the high-voltage signal generated by the external power supply, and the first supply voltage, the first trigger signal generation circuit and the second trigger signal generation circuit are respectively in the third working state and the fourth working state, and the first trigger signal generation circuit generates a high-level first trigger signal, and the second trigger signal generation circuit generates a low-level second trigger signal. The drive signal generation circuit generates a low-level drive signal to the first low-voltage drive transistor according to the first trigger signal and the second trigger signal; When the input signal is a low-level signal, based on the second low-voltage drive signal generation circuit in the second working state, the high-voltage signal generated by the external power supply, and the first supply voltage, the first trigger signal generation circuit and the second trigger signal generation circuit are respectively in the fifth working state and the sixth working state, and the first trigger signal generation circuit generates a low-level first trigger signal, and the second trigger signal generation circuit generates a high-level second trigger signal. The drive signal generation circuit generates a high-level drive signal to the first low-voltage drive transistor according to the first trigger signal and the second trigger signal.

8. The high-voltage switch tube driving power supply according to claim 7, wherein The first trigger signal generation circuit includes: a first switch transistor, a second switch transistor, a third switch transistor, a first inverter, and a third inverter. The power supply voltage of the first inverter and the third inverter is a high-voltage signal, and the ground voltage is the first supply voltage; The first terminal of the first switch transistor is connected to the external power supply. The second terminal of the first switch transistor is connected to the first terminal of the second switch transistor, the first terminal of the third switch transistor, and the input terminal of the first inverter. The third terminal of the first switch transistor is connected to the second terminal of the second switch transistor and the fourth terminal of the second trigger signal generation circuit. The third terminal of the second switch transistor is connected to the second terminal of the third switch transistor and the second terminal of the power supply circuit. The third terminal of the third switch transistor is connected to the second terminal of the second low-voltage drive signal generation circuit. The output terminal of the first inverter is connected to the input terminal of the third inverter and the third terminal of the drive signal generation circuit. The output terminal of the third inverter is connected to the fifth terminal of the second trigger signal generation circuit; And / or, the second trigger signal generation circuit includes a fourth switching transistor, a fifth switching transistor, a sixth switching transistor, a second inverter, and a fourth inverter. The power supply voltage of the second inverter and the fourth inverter is a high voltage signal, and the ground voltage is the first supply voltage; The first terminal of the fourth switching transistor is connected to an external power supply. The second terminal of the fourth switching transistor is connected to the first terminal of the fifth switching transistor, the first terminal of the sixth switching transistor, and the input terminal of the fourth inverter. The third terminal of the fourth switching transistor is connected to the second terminal of the fifth switching transistor and the fifth terminal of the first trigger signal generation circuit. The third terminal of the fifth switching transistor is connected to the second terminal of the sixth switching transistor and the second terminal of the power supply circuit. The third terminal of the sixth switching transistor is connected to the third terminal of the second low-voltage drive signal generation circuit. The output terminal of the fourth inverter is connected to the input terminal of the second inverter and the fourth terminal of the drive signal generation circuit. The output terminal of the second inverter is connected to the fourth terminal of the first trigger signal generation circuit.

9. The high-voltage switch tube driving power supply according to claim 7, wherein The drive signal generation circuit includes: an RS flip-flop. The set terminal of the RS flip-flop is connected to the sixth terminal of the first trigger signal generation circuit. The reset terminal of the RS flip-flop is connected to the sixth terminal of the second trigger signal generation circuit. The non-inverting output terminal of the RS flip-flop is connected to the second terminal of the first drive switching transistor.

10. The high-voltage switch tube driving power supply according to claim 9, characterized in that, The drive signal generation circuit further includes: a fifth inverter and a sixth inverter. The power supply voltage of the fifth inverter and the sixth inverter is a high voltage signal, and the ground voltage is the first supply voltage. The input terminal of the fifth inverter is connected to the non-inverting output terminal of the RS flip-flop. The output terminal of the fifth inverter is connected to the input terminal of the sixth inverter. The output terminal of the sixth inverter is connected to the second terminal of the first drive switching transistor.

11. The high-voltage switch tube driving power supply according to claim 7, characterized in that, The drive signal generation circuit includes: an RS flip-flop and a twelfth inverter. The power supply voltage of the twelfth inverter is a high voltage signal, and the ground voltage is the first supply voltage. The set terminal of the RS flip-flop is connected to the sixth terminal of the first trigger signal generation circuit. The reset terminal of the RS flip-flop is connected to the sixth terminal of the second trigger signal generation circuit. The inverting output terminal of the RS flip-flop is connected to the input terminal of the twelfth inverter. The output terminal of the twelfth inverter is connected to the second terminal of the first drive switching transistor.

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