A positive and negative high voltage signal control circuit and control method

Abstract

The present invention provides a positive and negative high-voltage signal control circuit and a control method, which converts the input voltage into a positive high-voltage signal and a negative high-voltage signal through a single boost circuit in conjunction with a positive and negative voltage generating circuit. Under the control of a synchronous signal control circuit, a waveform generating circuit can convert these high-voltage signals into two square wave signals with opposite phases and achieve synchronous output. The circuit not only eliminates the need for an additional signal processor and a dedicated positive and negative voltage integrated circuit, simplifies the circuit structure, reduces costs, but also has the advantages of small size and high integration. In addition, by adjusting the frequency of the control signal generated by the synchronous signal control circuit, the frequency adjustment of the first square wave signal and the second square wave signal can be achieved, which meets the use requirements of various scenarios and simplifies the debugging steps.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuits, and in particular to a positive and negative high voltage signal control circuit and a control method. Background Art

[0002] In the design of electronic products, positive and negative high-voltage synchronous signals are often used to drive PC audio processors and large-screen display gate circuits. The existing technology mainly uses dedicated positive and negative voltage output ICs or professional signal generators to achieve this, but these solutions generally have problems such as high cost, large size, and low integration. Among them, the dedicated IC solution requires an additional signal processor to achieve synchronization, which increases the complexity of the system; while the professional signal generator is bulky and difficult to integrate into portable electronic products. It is also expensive and not suitable for large-scale applications. Summary of the invention

[0003] The present invention provides a positive and negative high voltage signal control circuit and a control method, which can improve the output square wave voltage and reduce the configuration cost of the square wave voltage.

[0004] A boost circuit, boosting the input voltage to a preset voltage value;

[0005] A positive and negative voltage generating circuit, generating a positive high voltage signal and a negative high voltage signal based on the preset voltage value;

[0006] A synchronization signal control circuit, used for generating a synchronization control signal; and

[0007] A waveform generating circuit converts the positive high voltage signal and the negative high voltage signal into a first square wave signal and a second square wave signal respectively according to the synchronous control signal, and synchronously outputs the first square wave signal and the second square wave signal; wherein the first square wave signal and the second square wave signal have opposite phases.

[0008] Furthermore, the boost circuit comprises:

[0009] An energy conversion unit, used for periodically storing and releasing energy under the control of the DCDC boost module, and generating an output signal at a switch terminal SW of the DCDC boost module;

[0010] A voltage regulating unit, used for regulating the output signal of the switch terminal SW so that the output signal can reach a preset voltage value;

[0011] The DCDC boost module receives the input voltage and outputs the preset voltage value to the positive and negative voltage generating circuit.

[0012] Further, the voltage control unit includes: the DCDC boost module includes: a DCDC boost chip; the energy conversion unit includes an inductor L1; the voltage regulation unit includes a first resistor R1 and a second resistor R2;

[0013] The input terminal VIN of the DCDC boost chip is connected to the input voltage; one end of the inductor L1 is connected to the input terminal, and the other end is connected to the switch terminal SW of the DCDC boost chip, and the switch terminal SW of the DCDC boost chip is also connected to the input terminal of the positive and negative voltage generating circuit; one end of the first resistor R1 is connected to the input terminal of the waveform generating circuit, and the other end is connected to one end of the second resistor R2 and then connected to the feedback terminal FB of the DCDC boost chip, and the other end of the second resistor R2 is grounded.

[0014] Furthermore, the boost circuit further includes: a first capacitor C1, a second capacitor C2 and a third resistor R3;

[0015] One end of the third resistor R3 is connected to the enable terminal EN of the DCDC boost chip; the other end of the third resistor R3 is connected to the voltage input terminal of the DCDC boost chip and is grounded through the second capacitor C2;

[0016] The first capacitor C1 is connected in parallel to both ends of the first resistor R1.

[0017] Furthermore, the positive and negative voltage generating circuit includes: the positive and negative voltage generating circuit includes:

[0018] a positive voltage generating circuit, generating the positive high voltage signal based on the preset voltage value; and

[0019] A negative voltage generating circuit, generating the negative high voltage signal based on the preset voltage value;

[0020] The positive voltage generating circuit comprises: a third capacitor C3, a first diode D1, a second diode D2 and a fifth capacitor C5;

[0021] One end of the third capacitor C3 is connected to the switch end SW of the DCDC boost chip; the other end of the third capacitor C3 is connected to the cathode of the first diode D1, the anode of the first diode D1 is grounded, the cathode of the first diode D1 is also connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the first input end of the waveform generating circuit, one end of the fifth capacitor C5 is connected between the cathode of the second diode D2 and the first input end of the waveform generating circuit, and the other end is grounded;

[0022] The negative voltage generating circuit comprises: a fourth capacitor C4, a third diode D3, a fourth diode D4 and a sixth capacitor C6;

[0023] One end of the fourth capacitor C4 is connected to the switch end SW of the DCDC boost chip; one end of the fourth capacitor C4 is connected to the cathode of the fourth diode D4 and the anode of the third diode D3; the cathode of the third diode D3 is grounded; the anode of the fourth diode D4 is connected to the second input end of the waveform generating circuit, one end of the sixth capacitor C6 is connected between the cathode of the fourth diode D4 and the second input end of the waveform generating circuit, and the other end is grounded.

[0024] Furthermore, the synchronization signal control circuit includes:

[0025] A controller for outputting a control signal with adjustable frequency;

[0026] The signal shaping circuit is used to synchronously generate a first synchronous control signal and a second synchronous control signal with opposite phases according to the control signal.

[0027] Furthermore, the signal shaping circuit comprises:

[0028] A first signal shaping circuit, configured to generate the first synchronization control signal according to the control signal;

[0029] The first signal shaping circuit includes: a first transistor Q1, a fourth resistor R4, a fifth resistor R5 and a seventh capacitor C7;

[0030] The control signal is input to the base of the first transistor Q1 after passing through the fourth resistor R4, the collector of the first transistor Q1 is connected to the power supply voltage, the emitter of the first transistor Q1 is connected to the third input terminal of the waveform generating circuit through the seventh capacitor C7, and the emitter of the first transistor Q1 is also grounded through the fifth resistor R5.

[0031] Furthermore, the signal shaping circuit further includes:

[0032] a second signal shaping circuit, configured to generate the second synchronization control signal according to the control signal;

[0033] The second signal shaping circuit includes: a second transistor Q2, a fourth resistor R4, a sixth resistor R6 and an eighth capacitor C8;

[0034] The control signal is input to the base of the second transistor Q2 after passing through the fourth resistor R4, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is connected to the power supply voltage through the sixth resistor R6, and the collector of the second transistor Q2 is also connected to the fourth input terminal of the waveform generating circuit through the eighth capacitor C8.

[0035] Further, the waveform generating circuit includes: a third transistor Q3, a fourth transistor Q4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10;

[0036] The base of the third transistor Q3 is connected to the first synchronous control signal through the seventh capacitor C7, and is also connected to the first output end of the positive and negative voltage generating circuit through the seventh resistor R7, and the first output end outputs the positive high voltage signal;

[0037] The emitter of the third transistor Q3 is connected to the positive high voltage signal through the eighth resistor R8, and outputs the first square wave signal;

[0038] The collector of the third transistor Q3 is connected to the collector of the fourth transistor Q4;

[0039] The base of the fourth transistor Q4 is connected to the second synchronous control signal through the eighth capacitor C8, and is also connected to the second output end of the positive and negative voltage generating circuit through the tenth resistor R10, and the second output end outputs the negative high voltage signal;

[0040] The emitter of the third transistor Q3 is connected to the negative high voltage signal through the ninth resistor R9, and outputs the second square wave signal.

[0041] The present invention also discloses a positive and negative high voltage signal control method, the method comprising:

[0042] Boost the input voltage to a preset voltage value;

[0043] Generate a positive high voltage signal and a negative high voltage signal based on the preset voltage value;

[0044] generating a synchronous control signal;

[0045] According to the synchronization control signal, the positive high voltage signal and the negative high voltage signal are respectively converted into a first square wave signal and a second square wave signal, and the first square wave signal and the second square wave signal are synchronously output; wherein the first square wave signal and the second square wave signal have opposite phases.

[0046] Compared with the prior art, the present invention has at least the following technical effects:

[0047] This solution converts the input voltage into a positive high voltage signal and a negative high voltage signal through a single boost circuit in conjunction with a positive and negative voltage generating circuit. Under the control of the synchronization signal control circuit, the waveform generating circuit can convert these high voltage signals into two square wave signals with opposite phases and achieve synchronous output. This circuit not only eliminates the need for an additional signal processor and dedicated positive and negative voltage integrated circuits, simplifies the circuit structure, reduces costs, but also has the advantages of small size and high integration. In addition, by adjusting the frequency of the control signal generated by the synchronization signal control circuit, the frequency adjustment of the first square wave signal and the second square wave signal can be achieved, which meets the use requirements of various scenarios and simplifies the debugging steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Schematic diagram of the structure of a positive and negative high voltage signal control circuit in one embodiment of the present invention;

[0049] Figure 2 is a schematic structural diagram of a voltage boost circuit in one embodiment of the present invention;

[0050] Figure 3 A voltage waveform diagram obtained after being processed by a voltage boost circuit in one embodiment of the present invention;

[0051] Figure 4 is a structural schematic diagram of a positive and negative voltage generating circuit in one embodiment of the present invention;

[0052] Figure 5 It is a structural schematic diagram of a synchronization signal control circuit and a waveform generation circuit in one embodiment of the present invention;

[0053] Figure 6 Schematic diagram of waveforms of a first waveform signal and a second waveform signal in one embodiment of the present invention. DETAILED DESCRIPTION

[0054] The following is a description of a positive and negative high voltage signal control circuit and control method of the present invention in conjunction with a schematic diagram, wherein a preferred embodiment of the present invention is shown, and it should be understood that those skilled in the art can modify the present invention described herein and still achieve the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.

[0055] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0056] Please refer to Figure 1 , this embodiment discloses a positive and negative high voltage signal control circuit, the circuit comprising:

[0057] A boost circuit 1, boosting the input voltage to a preset voltage value;

[0058] A positive and negative voltage generating circuit 2 generates a positive high voltage signal Vhigh and a negative high voltage signal Vlow based on the preset voltage value;

[0059] A synchronization signal control circuit 3, used to generate a synchronization control signal with adjustable frequency; and

[0060] The waveform generating circuit 4 converts the positive high voltage signal Vhigh and the negative high voltage signal Vlow into a first square wave signal TP1 and a second square wave signal TP2 respectively according to the synchronous control signal, and synchronously outputs the first square wave signal TP1 and the second square wave signal TP2; wherein the first square wave signal TP1 and the second square wave signal TP2 have opposite phases.

[0061] In this embodiment, a single DCDC boost circuit 1 (DC-DC boost converter) is used in conjunction with a positive and negative voltage generating circuit 2 to achieve the generation of positive and negative high voltage signals, simplify the circuit structure, and reduce system costs. The synchronization signal control circuit 3 can generate a complementary synchronization control signal with adjustable frequency, so that the signal waveform and frequency can be flexibly adjusted according to actual needs. The synchronization signal control circuit 3 is used in conjunction with the waveform generating circuit 4 to achieve the synchronous output of positive and negative high voltage signals. This circuit not only eliminates the need for an additional signal processor and a dedicated positive and negative voltage integrated circuit, but also has the advantages of small size and high integration, and is more suitable for use in various portable electronic products.

[0062] Furthermore, the boost circuit 1 includes: an energy conversion unit, which is used to perform periodic energy storage and release under the control of the DCDC boost module, and generate an output signal at the switch end SW of the DCDC boost module; a voltage regulation unit, which is used to regulate the output signal of the switch end SW so that the output signal can reach a preset voltage value; the DCDC boost module receives the input voltage and outputs the preset voltage value to the positive and negative voltage generating circuit 2.

[0063] Please refer to Figure 2 In a specific embodiment, the voltage control unit includes: the DCDC boost module includes: a DCDC boost chip; the energy conversion unit includes an inductor L1; the voltage regulation unit includes a first resistor R1 and a second resistor R2;

[0064] The input terminal VIN of the DCDC boost chip is connected to the input voltage VDD_SYS1; one end of the inductor L1 is connected to the input terminal VIN, and the other end is connected to the switch terminal SW of the DCDC boost chip, and the switch terminal SW of the DCDC boost chip is also connected to the input end of the positive and negative voltage generating circuit 2; one end of the first resistor R1 is connected to the input end of the waveform generating circuit 4, and the other end is connected to one end of the second resistor R2 and then connected to the feedback terminal FB of the DCDC boost chip, and the other end of the second resistor R2 is grounded.

[0065] The above circuit adopts the DCDC boost principle, and controls the on and off of the switch terminal SW through the DCDC boost chip. When the switch is turned on, the current flows from the input terminal to the ground through the inductor L1, and the inductor L1 stores energy; when the switch is turned off, the inductor L1 releases energy and generates a reverse induced voltage higher than the input voltage. At the same time, the output voltage is fed back to the feedback terminal FB of the DCDC chip through the voltage divider network composed of the first resistor R1 and the second resistor R2. The chip automatically adjusts the switch duty cycle by comparing the feedback voltage and the internal reference voltage to achieve stable control of the output voltage.

[0066] In a specific embodiment, the DCDC boost IC converts the input voltage of 5V into a preset voltage value of +38V. Figure 3 , is a voltage waveform diagram of the output of the switch terminal SW of the DCDC boost chip. It is understandable that those skilled in the art can select different input voltages according to actual conditions, and obtain different preset voltage values ​​by adjusting the values ​​of the first resistor R1 and the second resistor R2, for example: inputting a voltage of 5V to obtain a voltage of +76V.

[0067] It can be seen that stable high-voltage output control is achieved through the above-mentioned single DCDC boost principle and voltage division feedback method. In addition, this solution can not only convert the 5V input voltage into 38V high voltage, but also achieve precise adjustment of the output voltage by adjusting the feedback resistor, avoiding complex voltage control circuits, reducing costs and circuit complexity, while ensuring the stability and reliability of the output voltage.

[0068] Preferably, in this embodiment, the boost circuit 1 further includes: a first capacitor C1, a second capacitor C2 and a third resistor R3.

[0069] One end of the third resistor R3 is connected to the enable end EN of the DCDC boost chip; the other end of the third resistor R3 is connected to the voltage input end of the DCDC boost chip and is grounded through the second capacitor C2; the first capacitor C1 is connected in parallel to both ends of the first resistor R1.

[0070] Specifically, the first capacitor C1 is connected in parallel across the first resistor R1 to perform filtering and decoupling, which can effectively suppress the ripple of the input voltage and improve the stability of the input signal; the second capacitor C2 is grounded to provide stable voltage support for the voltage input end of the DCDC boost chip, reduce voltage fluctuations, and ensure that the chip works in an ideal state; the third resistor R3 is connected to the enable end EN and the input end VIN of the DCDC boost chip, and provides a suitable bias voltage for the enable end EN through a reasonable resistance configuration to ensure normal startup and operation of the chip.

[0071] Please refer to Figure 4 Furthermore, in this embodiment, the positive and negative voltage generating circuit 2 includes: a positive voltage generating circuit, which generates a positive high voltage signal Vhigh based on the preset voltage value; the positive voltage generating circuit includes: a third capacitor C3, a first diode D1, a second diode D2 and a fifth capacitor C5.

[0072] Specifically, one end of the third capacitor C3 is connected to the switch end SW of the DCDC boost chip; the other end of the third capacitor C3 is connected to the cathode of the first diode D1, the anode of the first diode D1 is grounded, the cathode of the first diode D1 is also connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the first input end of the waveform generating circuit 4, one end of the fifth capacitor C5 is connected between the cathode of the second diode D2 and the first input end of the waveform generating circuit 4, and the other end is grounded.

[0073] In the above circuit, the switch end SW generates a peak voltage of up to 38V when the DCDC switch is working. After coupling through the third capacitor C3, the switch pulse signal at the SW end is converted into a unidirectional high-voltage signal by clamping with the first diode D1 and shaping with the second diode D2. Finally, it is filtered and smoothed by the fifth capacitor C5 to output a stable +38V DC high voltage for use by the waveform generation circuit 4.

[0074] Furthermore, in this embodiment, the positive and negative voltage generating circuit also includes: a negative voltage generating circuit, which generates a negative high voltage signal Vlow based on the preset voltage value; the negative voltage generating circuit includes: a fourth capacitor C4, a third diode D3, a fourth diode D4 and a sixth capacitor C6.

[0075] Specifically, one end of the fourth capacitor C4 is connected to the switch end SW of the DCDC boost chip; one end of the fourth capacitor C4 is connected to the cathode of the fourth diode D4 and the anode of the third diode D3; the cathode of the third diode D3 is grounded; the anode of the fourth diode D4 is connected to the second input end of the waveform generating circuit 4, one end of the sixth capacitor C6 is connected between the cathode of the fourth diode D4 and the second input end of the waveform generating circuit 4, and the other end is grounded.

[0076] In the above circuit, when the switching signal output by the switch terminal SW is coupled through the fourth capacitor C4, the characteristic that the voltage across the capacitor cannot change suddenly is used to generate a negative voltage, and then the third diode D3 limits the positive voltage and the fourth diode D4 conducts the negative voltage. Finally, it is filtered and smoothed by the sixth capacitor C6 to output a stable -38V DC negative voltage for use by the waveform generation circuit 4.

[0077] In this embodiment, by building four diodes, positive voltage and negative voltage can be output simultaneously, which simplifies the circuit structure and reduces the debugging cost of outputting positive and negative voltages simultaneously.

[0078] In a specific embodiment, when the input preset voltage value is 38V, based on the preset voltage value, the voltage output by the first signal shaping circuit is 38V, and the voltage output by the second signal shaping circuit is -38V.

[0079] Please refer to Figure 5 Furthermore, in this embodiment, the synchronization signal control circuit 3 includes: a controller for outputting a frequency-adjustable control signal Signal, and a signal shaping circuit for generating a first synchronization control signal and a second synchronization control signal with opposite phases according to the control signal.

[0080] In this embodiment, the signal shaping circuit includes: a first signal shaping circuit, configured to generate a first synchronous control signal according to the control signal Signal.

[0081] Specifically, the first signal shaping circuit includes: a first transistor Q1, a fourth resistor R4, a fifth resistor R5 and a seventh capacitor C7. The control signal Signal is input to the base of the first transistor Q1 after passing through the fourth resistor R4, the collector of the first transistor Q1 is connected to the power supply voltage VCC, the emitter of the first transistor Q1 is connected to the third input terminal of the waveform generating circuit 4 through the seventh capacitor C7, and the emitter of the first transistor Q1 is also grounded through the fifth resistor R5.

[0082] The signal shaping circuit further includes: a second signal shaping circuit, configured to generate a second synchronous control signal according to the control signal Signal.

[0083] Specifically, the second signal shaping circuit includes: a second triode Q2, a fourth resistor R4, a sixth resistor R6 and an eighth capacitor C8. The control signal Signal is input to the base of the second triode Q2 after passing through the fourth resistor R4, the emitter of the second triode Q2 is grounded, the collector of the second triode Q2 is connected to the power supply voltage VCC through the sixth resistor R6, and the collector of the second triode Q2 is also connected to the fourth input terminal of the waveform generating circuit 4 through the eighth capacitor C8.

[0084] In this embodiment, the control signal Signal output by the controller passes through two signal shaping circuits, wherein the first signal shaping circuit uses common emitter amplification; when the control signal Signal is at a high level, the transistor turns on the emitter to output a low level, and when the control signal Signal is at a low level, the transistor turns off the emitter to output a high level. The second signal shaping circuit uses common emitter inversion, when the control signal Signal is at a high level, the transistor turns on the collector to output a low level, and when the control signal Signal is at a low level, the transistor turns off the collector to output a high level, thereby obtaining a first synchronous control signal and a second synchronous control signal with a phase difference of 180 degrees, and the first synchronous control signal and the second synchronous control signal are respectively coupled to the waveform generation circuit 4 through the seventh capacitor C7 and the eighth capacitor C8 to realize synchronous switching control of positive and negative high voltages.

[0085] In a specific embodiment, the controller is an MCU controller.

[0086] Please continue to refer to Figure 5 Further, the waveform generating circuit 4 includes: a third transistor Q3, a fourth transistor Q4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10.

[0087] The base of the third triode Q3 is connected to the first synchronous control signal through the seventh capacitor C7, and is also connected to the first output end of the positive and negative voltage generating circuit 2 (that is, the cathode of the second diode D2) through the seventh resistor R7, and the first output end outputs the positive high voltage signal; the emitter of the third triode Q3 is connected to the positive high voltage signal through the eighth resistor R8, and outputs the first square wave signal TP1; the collector of the third triode Q3 is connected to the collector of the fourth triode Q4. The base of the fourth triode Q4 is connected to the second synchronous control signal through the eighth capacitor C8, and is also connected to the second output end of the positive and negative voltage generating circuit 2 (that is, the anode of the fourth diode D4) through the tenth resistor R10, and the second output end outputs the negative high voltage signal; the emitter of the third triode Q3 is connected to the negative high voltage signal through the ninth resistor R9, and outputs the second square wave signal TP2.

[0088] Please refer to Figure 6 Specifically, two synchronous control signals with opposite phases are coupled to the bases of the third triode Q3 and the fourth triode Q4 through the seventh capacitor C7 and the eighth capacitor C8, respectively. The seventh resistor R7 and the tenth resistor R10 provide bias voltages for the third triode Q3 and the fourth triode Q4, respectively. When the first synchronous signal is at a high level, the third triode Q3 is turned on, and its emitter outputs a positive high voltage through the eighth resistor R8, while the fourth triode Q4 is turned off, and the output is 0V; when the second synchronous signal is at a high level, the fourth triode Q4 is turned on, and its emitter outputs a negative high voltage through the ninth resistor R9, while the third triode Q3 is turned off, and the output is 0V. The complementary conduction state of the two triodes realizes the precise synchronous switching output of the first square wave signal TP1 and the second square wave signal TP2.

[0089] Please refer to Figure 6 In a specific embodiment, when the preset voltage value is 38V, the positive and negative voltage generating circuit 2 generates voltages of +38V and -38V respectively, and the frequency of the control signal Signal is set in the MCU controller, and the third transistor Q3 and the fourth transistor Q4 are synchronously turned on, so that the first square wave signal TP1 and the second square wave signal TP2 can be synchronously fluctuated following the set frequency, wherein the first square wave signal TP1 fluctuates between 38V and 0V, and the second square wave signal TP2 fluctuates between -38V and 0V.

[0090] In summary, in this embodiment, the signal shaping circuit realizes the generation of synchronous control signals with opposite phases through the structure of common emitter amplification and common emitter inversion, and the waveform generation circuit 4 realizes the precise switching of positive and negative high voltage signals by using the complementary working characteristics of the two triodes. It can be seen that the simultaneous output of square wave signals with opposite phases can be realized by only building triodes and MCU, and the reliability and stability of signal switching are ensured through capacitor coupling and reasonable bias resistor configuration. This design is not only simple in structure and low in cost, but also has strong practical value because the frequency characteristics of the output waveform can be flexibly adjusted through the MCU at the same time.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A positive and negative high voltage signal control circuit, characterized in that: include: A boost circuit, boosting the input voltage to a preset voltage value; A positive and negative voltage generating circuit, generating a positive high voltage signal and a negative high voltage signal based on the preset voltage value; A synchronization signal control circuit generates and regulates a synchronization control signal; as well as A waveform generating circuit converts the positive high voltage signal and the negative high voltage signal into a first square wave signal and a second square wave signal respectively according to the synchronous control signal, and synchronously outputs the first square wave signal and the second square wave signal; wherein the first square wave signal and the second square wave signal have opposite phases.

2. The positive and negative high voltage signal control circuit according to claim 1, characterized in that: The boost circuit comprises: An energy conversion unit, used for periodically storing and releasing energy under the control of the DCDC boost module, and generating an output signal; A voltage regulating unit, used for regulating the output signal so that the output signal can reach a preset voltage value; The DCDC boost module receives the input voltage and outputs the preset voltage value to the positive and negative voltage generating circuit.

3. The positive and negative high voltage signal control circuit according to claim 2, characterized in that: The DCDC boost module includes: a DCDC boost chip; the energy conversion unit includes an inductor L1; the voltage adjustment unit includes a first resistor R1 and a second resistor R2; The input terminal VIN of the DCDC boost chip is connected to the input voltage; one end of the inductor L1 is connected to the input terminal, and the other end is connected to the switch terminal SW of the DCDC boost chip, and the switch terminal SW of the DCDC boost chip is also connected to the input terminal of the positive and negative voltage generating circuit; one end of the first resistor R1 is connected to the input terminal of the waveform generating circuit, and the other end is connected to one end of the second resistor R2 and then connected to the feedback terminal FB of the DCDC boost chip, and the other end of the second resistor R2 is grounded.

4. The positive and negative high voltage signal control circuit according to claim 3, characterized in that: The boost circuit further includes: a first capacitor C1, a second capacitor C2 and a third resistor R3; One end of the third resistor R3 is connected to the enable terminal EN of the DCDC boost chip; the other end of the third resistor R3 is connected to the voltage input terminal of the DCDC boost chip and is grounded through the second capacitor C2; The first capacitor C1 is connected in parallel to both ends of the first resistor R1.

5. The positive and negative high voltage signal control circuit according to claim 1, characterized in that: The positive and negative voltage generating circuit comprises: a positive voltage generating circuit, generating the positive high voltage signal based on the preset voltage value; and A negative voltage generating circuit, generating the negative high voltage signal based on the preset voltage value; The positive voltage generating circuit comprises: a third capacitor C3, a first diode D1, a second diode D2 and a fifth capacitor C5; One end of the third capacitor C3 is connected to the switch end SW of the DCDC boost chip; the other end of the third capacitor C3 is connected to the cathode of the first diode D1, the anode of the first diode D1 is grounded, the cathode of the first diode D1 is also connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the first input end of the waveform generating circuit, one end of the fifth capacitor C5 is connected between the cathode of the second diode D2 and the first input end of the waveform generating circuit, and the other end is grounded; The negative voltage generating circuit comprises: a fourth capacitor C4, a third diode D3, a fourth diode D4 and a sixth capacitor C6; One end of the fourth capacitor C4 is connected to the switch end SW of the DCDC boost chip; one end of the fourth capacitor C4 is connected to the cathode of the fourth diode D4 and the anode of the third diode D3; the cathode of the third diode D3 is grounded; the anode of the fourth diode D4 is connected to the second input end of the waveform generating circuit, one end of the sixth capacitor C6 is connected between the cathode of the fourth diode D4 and the second input end of the waveform generating circuit, and the other end is grounded.

6. The positive and negative high voltage signal control circuit according to claim 1, characterized in that: The synchronization signal control circuit comprises: A controller for outputting a control signal with adjustable frequency; The signal shaping circuit is used to synchronously generate a first synchronous control signal and a second synchronous control signal with opposite phases according to the control signal.

7. The positive and negative high voltage signal control circuit according to claim 6, characterized in that: The signal shaping circuit comprises: A first signal shaping circuit, configured to generate the first synchronization control signal according to the control signal; The first signal shaping circuit includes: a first transistor Q1, a fourth resistor R4, a fifth resistor R5 and a seventh capacitor C7; The control signal is input to the base of the first transistor Q1 after passing through the fourth resistor R4, the collector of the first transistor Q1 is connected to the power supply voltage, the emitter of the first transistor Q1 is connected to the third input terminal of the waveform generating circuit through the seventh capacitor C7, and the emitter of the first transistor Q1 is also grounded through the fifth resistor R5.

8. The positive and negative high voltage signal control circuit according to claim 7, characterized in that: The signal shaping circuit also includes: a second signal shaping circuit, configured to generate the second synchronization control signal according to the control signal; The second signal shaping circuit includes: a second transistor Q2, a fourth resistor R4, a sixth resistor R6 and an eighth capacitor C8; The control signal is input to the base of the second transistor Q2 after passing through the fourth resistor R4, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is connected to the power supply voltage through the sixth resistor R6, and the collector of the second transistor Q2 is also connected to the fourth input terminal of the waveform generating circuit through the eighth capacitor C8.

9. The positive and negative high voltage signal control circuit according to claim 8, characterized in that: The waveform generating circuit comprises: a third transistor Q3, a fourth transistor Q4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10; The base of the third transistor Q3 is connected to the first synchronous control signal through the seventh capacitor C7, and is also connected to the first output end of the positive and negative voltage generating circuit through the seventh resistor R7, and the first output end outputs the positive high voltage signal; The emitter of the third transistor Q3 is connected to the positive high voltage signal through the eighth resistor R8, and outputs the first square wave signal; The collector of the third transistor Q3 is connected to the collector of the fourth transistor Q4; The base of the fourth transistor Q4 is connected to the second synchronous control signal through the eighth capacitor C8, and is also connected to the second output end of the positive and negative voltage generating circuit through the tenth resistor R10, and the second output end outputs the negative high voltage signal; The emitter of the third transistor Q3 is connected to the negative high voltage signal through the ninth resistor R9, and outputs the second square wave signal.

10. A positive and negative high voltage signal control method, characterized in that: The method comprises: Boost the input voltage to a preset voltage value; Generate a positive high voltage signal and a negative high voltage signal based on the preset voltage value; Generate and regulate synchronization control signals; According to the synchronization control signal, the positive high voltage signal and the negative high voltage signal are respectively converted into a first square wave signal and a second square wave signal, and the first square wave signal and the second square wave signal are synchronously output; wherein the first square wave signal and the second square wave signal have opposite phases.

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