A quasi-square wave high voltage power supply

Abstract

The present invention discloses a quasi-square wave high-voltage power supply, including a signal input and control circuit, a signal amplifying circuit, a signal driving circuit, a power driving and impedance matching circuit and a boost conversion circuit, wherein the output end of the signal input and control circuit is connected to the input end of the signal amplifying circuit, the output end of the signal amplifying circuit is connected to the input end of the signal driving circuit, the output end of the signal driving circuit is connected to the input end of the power driving and impedance matching circuit, and the output end of the power driving and impedance matching circuit is connected to the input end of the boost conversion circuit. The present invention makes up for the deficiency of low transient current and voltage of high-voltage sine waves, and also meets the needs of some research institutions and colleges and universities for high-voltage transient large current and large voltage.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage power supply, and more specifically relates to a quasi-square wave high-voltage power supply. Background Art

[0002] At present, high-voltage sine wave power supplies are widely used as excitation sources in many industrial or research fields, such as dielectric impedance discharge devices, pollution treatment, etc. However, the high-voltage sine wave is difficult to meet the requirements of some special application fields, such as special surface treatment, special material modification, etc., due to its relatively low transient current and voltage (dv / dt) limitations. Under the conditions of the same peak amplitude and basic frequency, the quasi-square wave high-voltage signal has a much higher volt-second (dv / dt), that is, transient current and transient voltage, than the high-voltage sine wave.

[0003] Therefore, how to provide a quasi-square wave high voltage power supply has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention provides a quasi-square wave high voltage power supply, which makes up for the shortcomings of the low transient current and voltage of the high voltage sine wave, and also meets the needs of some research institutions and colleges and universities for high voltage transient large current and high voltage.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A quasi-square wave high-voltage power supply comprises: a signal input and control circuit, a signal amplifying circuit, a signal driving circuit, a power driving and impedance matching circuit and a boost conversion circuit, wherein the output end of the signal input and control circuit is connected to the input end of the signal amplifying circuit, the output end of the signal amplifying circuit is connected to the input end of the signal driving circuit, the output end of the signal driving circuit is connected to the input end of the power driving and impedance matching circuit, and the output end of the power driving and impedance matching circuit is connected to the input end of the boost conversion circuit.

[0007] Furthermore, it also includes a DC adjustable power supply, the output end of the DC adjustable power supply is connected to the input end of the power driving and impedance matching circuit.

[0008] Furthermore, the DC adjustable power supply includes a DC power supply, a rectifier circuit and a voltage adjustment circuit. The DC power supply is connected to the voltage adjustment circuit through the rectifier circuit, and the voltage adjustment circuit is connected to the power drive and impedance matching circuit.

[0009] Furthermore, it also includes a feedback and detection circuit, the input end of the feedback and detection circuit is connected to the power driving and impedance matching circuit, and the output end of the feedback and detection circuit is connected to the signal input and control circuit.

[0010] Furthermore, the signal input and control circuit includes a signal generator, an operational amplifier and an RS trigger, the operational amplifier and the RS trigger are both connected to the signal generator, and the operational amplifier is connected to the signal amplification circuit.

[0011] Furthermore, the signal amplification circuit includes a cross-conduction reduction circuit and a pre-driving circuit, the input ends of the cross-conduction reduction circuit and the pre-driving circuit are both connected to the output end of the signal input and control circuit, and the output ends of the cross-conduction reduction circuit and the pre-driving circuit are both connected to the input end of the signal driving circuit.

[0012] Furthermore, the boost conversion circuit is composed of one or more high-voltage transformers connected in series.

[0013] Furthermore, the coil of the high-voltage transformer is formed by a circuit board.

[0014] The beneficial effects of the present invention are:

[0015] The present invention aims to solve the problem of low high-voltage transient current and voltage (dv / dt) of high-voltage discharge devices on the current market. The present invention outputs a quasi-square wave high-voltage signal with steep rising and falling edges having faster transient current (di / dt) and transient voltage (dv / dt), which makes up for the deficiency of low transient current and voltage of high-voltage sine waves, and also meets the needs of some research institutions and colleges and universities for high-voltage transient large current and high voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A circuit diagram of one form of the present invention.

[0018] Figure 2 A circuit diagram of another form of the present invention.

[0019] Figure 3 for Figure 1 Input and output waveforms in the circuit.

[0020] Figure 3A for Figure 1 Another form of input and output waveform diagram in the circuit.

[0021] Figure 4 This is the schematic diagram of the boost converter circuit.

[0022] Figure 5 This is the input signal diagram of the boost converter circuit. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Please see attached Figure 1 The present invention provides a quasi-square wave high-voltage power supply, comprising: a signal input and control circuit 40, a signal amplifying circuit 50, a signal driving circuit 60, a power driving and impedance matching circuit 20 and a boost conversion circuit 30, wherein the output end 401 of the signal input and control circuit 40 is connected to the input end of the signal amplifying circuit 50, the output end of the signal amplifying circuit 50 is connected to the input end of the signal driving circuit 60, the output end of the signal driving circuit 60 is connected to the input end of the power driving and impedance matching circuit 20, the output end of the power driving and impedance matching circuit 20 is connected to the input end of the boost conversion circuit 30, and the output end of the boost conversion circuit 30 is connected to a load. Figure 1 The circuit path for generating a quasi-square wave high voltage signal from input signal 401 to output signals 301, 302 is illustrated.

[0025] See attached Figure 2 In another embodiment, the present invention further comprises a DC adjustable power supply 10, and an output terminal 101 of the DC adjustable power supply 10 is connected to an input terminal of a power driving and impedance matching circuit 20. The present invention further comprises a feedback and detection circuit 70, and an input terminal of the feedback and detection circuit 70 is connected to the power driving and impedance matching circuit 20, and an output terminal of the feedback and detection circuit 70 is connected to a signal input and control circuit 40. The feedback and detection circuit 70 sends some detection signals to the signal input and control circuit 40 for circuit conversion control.

[0026] The function of the DC adjustable power supply is to provide a DC voltage for the power drive circuit. The power drive and impedance matching circuit includes a power drive circuit and an impedance matching circuit, wherein the function of the power drive circuit is to output a strong power signal after conversion of the input weak signal, and the function of the impedance matching circuit is to make the power output and the load input reach impedance balance. The impedance matching circuit designed at the input port of the boost converter circuit is composed of a matching network of adjustable inductance. The circuit can make the input and output impedances reach a basic balance, and also improve the output efficiency. The output terminals 201 and 202 of the power drive and impedance matching circuit provide a power input signal for the boost converter circuit, so that it outputs a quasi-square wave high voltage signal from the output terminals 301 and 302 and then connects to the load. The function of the signal drive circuit is to provide an input signal for the power drive circuit. The function of the signal amplifier circuit is to amplify the input signal. The function of the input signal and control circuit is to provide a square wave input signal for the power amplifier circuit and provide a control function together with the feedback detection circuit.

[0027] Power drive and impedance matching circuit 20 as shown Figure 2 As shown, the power driving circuit outputs a single or multiple driving signals, and after the maximum delay time between the driving signals is controlled within 50ns, they enter the input end of the boost converter circuit; the impedance matching circuit is used to adjust the primary impedance of the boost converter circuit, and through impedance transformation, its output impedance is matched with the load input impedance.

[0028] The signal input and control circuit includes a signal generator, an operational amplifier and an RS trigger. The operational amplifier and the RS trigger are connected to the signal generator, and the operational amplifier is connected to the signal amplification circuit. The signal input and control circuit provides a square wave signal to the signal amplification circuit 50, and performs some circuit control and protection functions together with the feedback and detection circuit 70. The signal input and control circuit can generate a 5khz~100khz square wave signal, and can also accept a 5khz~100khz square wave signal input from an external source.

[0029] The signal amplification circuit includes a cross-conduction reduction circuit and a pre-driving circuit, the input ends of the cross-conduction reduction circuit and the pre-driving circuit are connected to the output end of the signal input and control circuit, and the output ends of the cross-conduction reduction circuit and the pre-driving circuit are connected to the input end of the signal driving circuit.

[0030] Figure 3 Explained Figure 1 The input waveform 401 and the output waveforms 301, 302. The rising edge of the output waveform The time of the rising edge change is related to the size of the capacitive load, and the time is approximately between 0.01us and 20us. The flat slope time of the output waveform is and ,in Approximately The falling edge of the output waveform , falling edge The time of change is related to the size of the capacitive load, and the time is approximately between 0.01us and 20us. The frequency of the input signal is approximately 5Khz to 100Khz, and the duty cycle is variable, ranging from 1% to 50%.

[0031] Figure 3A Explained Figure 1 The input waveform 401 and the output waveforms 301, 302. The rising edge of the output waveform , ,and The time of its rising edge change is related to the size of the capacitive load, and the time is approximately between 0.005us and 10us. The flat slope time of the output waveform is , ,and The falling edge of the output waveform , ,and The time of its falling edge is related to the size of the capacitive load, and the time is approximately between 0.005us and 10us. The frequency of the input signal is approximately 5Khz~100Khz, and the duty cycle is variable, ranging from 1% to 50%.

[0032] Figure 4 The detailed circuit diagram of the boost conversion circuit is explained, which is composed of one or thousands of high-voltage transformers connected in series. The primary of the high-voltage transformer inputs the driving signal through the signal input terminal 201, 201, and outputs the quasi-square wave high-voltage signal through the secondary output port 301, 302 after conversion. The coil of the high-voltage transformer is composed of several circuit boards. Compared with the traditional wire-wound transformer, this design greatly reduces the distributed capacitance, distributed leakage inductance and coil impedance of the transformer. Therefore, this specially designed high-voltage transformer using the circuit board as the coil has the advantages of lower output impedance, greater load capacity, easy starting and high-efficiency discharge. The boost conversion circuit of the present invention is composed of one or more high-voltage transformers, such as Figure 4 As shown, each level of high-voltage transformer coil adopts a circuit board design, which greatly reduces leakage inductance, parasitic capacitance and output impedance. This feature makes it possible to generate a quasi-square wave high-voltage signal.

[0033] Figure 5 Explained Figure 4 The input signals of the high voltage converter ports 1, 2 and 3, 4 (or more input ports) in the circuit. The delay time between each input signal is limited to within 50ns so that the high voltage conversion circuit can cumulatively generate a quasi-square wave high voltage signal. and .

[0034] The output power of the present invention can reach 5KW. The main power switch circuit of the present invention is composed of a special full-bridge drive circuit. Each power drive tube can achieve zero voltage or zero current switching, and the voltage stress is small, and the conversion efficiency is greatly improved. At the same time, the driving power tube can also be connected in parallel to obtain a higher output power.

[0035] The present invention aims to solve the problem of low high-voltage transient current and voltage (dv / dt) of high-voltage discharge devices on the current market. The present invention outputs a quasi-square wave high-voltage signal with steep rising and falling edges having faster transient current (di / dt) and transient voltage (dv / dt), which makes up for the deficiency of low transient current and voltage of high-voltage sine waves, and also meets the needs of some research institutions and colleges and universities for high-voltage transient large current and high voltage.

[0036] The present invention has special advantages for capacitive (such as dielectric impedance discharge) loads, which are specifically manifested in higher instantaneous discharge current (di / dt), higher instantaneous mutation voltage (dv / dt), high discharge efficiency, fast discharge start, good impedance matching characteristics, etc.

[0037] The present invention provides a quasi-square wave high voltage power supply, which is widely used in environmental engineering, automobile manufacturing, semiconductor manufacturing, consumer electronics manufacturing and other fields. It is widely used in packaging and printing, textile production, plastic products, automobile parts manufacturing, electronic equipment manufacturing, biomaterials, sterilization and disinfection, environmental protection equipment, oil and gas pipelines, heating pipelines, optoelectronics, aerospace and other industries.

[0038] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A quasi-square wave high voltage power supply, characterized in that: include: A signal input and control circuit, a signal amplifying circuit, a signal driving circuit, a power driving and impedance matching circuit, and a boost conversion circuit, wherein the output end of the signal input and control circuit is connected to the input end of the signal amplifying circuit, the output end of the signal amplifying circuit is connected to the input end of the signal driving circuit, the output end of the signal driving circuit is connected to the input end of the power driving and impedance matching circuit, and the output end of the power driving and impedance matching circuit is connected to the input end of the boost conversion circuit; It also includes a feedback and detection circuit, wherein the input end of the feedback and detection circuit is connected to the power driving and impedance matching circuit, and the output end of the feedback and detection circuit is connected to the signal input and control circuit; The signal input and control circuit comprises a signal generator, an operational amplifier and an RS trigger, wherein the operational amplifier and the RS trigger are both connected to the signal generator, and the operational amplifier is connected to the signal amplification circuit; The signal amplification circuit comprises a cross-conduction reduction circuit and a pre-driving circuit, the input ends of the cross-conduction reduction circuit and the pre-driving circuit are both connected to the output end of the signal input and control circuit, and the output ends of the cross-conduction reduction circuit and the pre-driving circuit are both connected to the input end of the signal driving circuit; The boost conversion circuit is composed of one or several high-voltage transformers connected in series; The signal input and control circuit provides a square wave signal of 5khz~100khz to the signal amplification circuit; The power driving and impedance matching circuit includes a power driving circuit and an impedance matching circuit, wherein the function of the power driving circuit is to output a strong power signal after converting the input weak signal, and the function of the impedance matching circuit is to achieve impedance balance between the power supply output and the load input, and the impedance matching circuit designed at the input port of the boost conversion circuit is composed of a matching network with adjustable inductance; The power driving circuit outputs a single or multiple driving signals, and after the maximum delay time between the driving signals is controlled within 50ns, the signals enter the input end of the boost conversion circuit; the impedance matching circuit is used to adjust the primary impedance of the boost conversion circuit, so that its output impedance matches the load input impedance through impedance transformation.

2. A quasi-square wave high voltage power supply according to claim 1, characterized in that: It also includes a DC adjustable power supply, the output end of which is connected to the input end of the power driving and impedance matching circuit.

3. A quasi-square wave high voltage power supply according to claim 2, characterized in that: The DC adjustable power supply includes a DC power supply, a rectifier circuit and a voltage regulating circuit. The DC power supply is connected to the voltage regulating circuit through the rectifier circuit, and the voltage regulating circuit is connected to the power driving and impedance matching circuit.

4. A quasi-square wave high voltage power supply according to claim 1, characterized in that: The coil of the high-voltage transformer is formed by a circuit board.

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