An alternating high current and high voltage output device

Abstract

The utility model belongs to the technical field of power electronic systems, and specifically discloses an alternating large current and high voltage output device, comprising a control unit, a MOS drive unit, an energy output unit, a current acquisition unit and a power supply unit, wherein the power supply unit comprises a transformer T1 and three groups of power supply modules connected in parallel with the output side of the transformer T1, wherein two groups of power supply modules are connected to the MOS drive unit, and the control unit comprises a single chip microcomputer with a built-in PWM module. The utility model cooperates with the control unit, the MOS drive unit, the energy output unit, the current acquisition unit and the power supply unit, and uses the single chip microcomputer to control the output PWM wave, and promotes a first PWM control circuit and a second PWM control circuit to be turned on in turn, so that the inductive load can output energy, and the power inductor output current is detected at the same time, thereby realizing the generation of a waveform with alternating large current, high voltage output and high inductive load rate at a relatively low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic systems, in particular to an alternating large current and high voltage output device. Background Art

[0002] Alternating high current and high voltage output equipment is a device that can simulate high current and high voltage output in various electrical environments. The equipment is mainly composed of a transformer, a rectifier, a frequency converter and a control system, which work together to generate the required AC waveform.

[0003] At present, the common ways to generate waveforms include using a digital-to-analog conversion (DA) module or a DA conversion chip and a waveform generator. However, the use of a DA conversion module or a DA conversion chip to generate waveforms is affected by the DA conversion frequency, and the frequency amplitude of the generated waveform is relatively low. The use of a waveform generator to generate waveforms is often costly, large in size, and low inductive load efficiency. Therefore, we need to propose an alternating large current and high voltage output device to solve the above problems, so that it can generate a waveform with alternating large current, high voltage output, and high inductive load rate at a lower cost. Utility Model Content

[0004] The utility model aims to provide an alternating large current and high voltage output device, which can produce a waveform with alternating large current, high voltage output and high inductive load rate at a relatively low cost, so as to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an alternating large current and high voltage output device, comprising a control unit, a MOS drive unit, an energy output unit, a current collection unit and a power supply unit, wherein the power supply unit comprises a transformer T1 and three groups of power supply modules connected in parallel with the output side of the transformer T1, wherein two groups of power supply modules are connected to the MOS drive unit, the control unit comprises a single-chip microcomputer with a built-in PWM module, another group of power supply modules is connected to the single-chip microcomputer, two ends of the single-chip microcomputer are electrically connected to the MOS drive unit and the current collection unit respectively, and the energy output unit is connected between the MOS drive unit and the power supply unit;

[0006] The MOS driving unit includes a MOS driving chip and a first PWM control circuit and a second PWM control circuit connected to the MOS driving chip, one end of the first PWM control circuit is connected to an energy storage capacitor C3, one end of the second PWM control circuit is connected to an energy storage capacitor C4, and one end of the energy storage capacitor C3 is connected to one end of the energy storage capacitor C4, and the other end of the energy storage capacitor C3 and the other end of the energy storage capacitor C4 are both connected to two of the power supply modules.

[0007] Preferably, the first PWM control circuit includes a resistor R1 connected to the MOS driver chip, one end of the resistor R1 is connected in parallel with a resistor R2, a power tube Q1, and a diode D1 and a diode D2 arranged in series, a capacitor C1 is connected between the source and the drain of the power tube Q1, and the capacitor C1 is connected in parallel with a capacitor C3.

[0008] Preferably, the second PWM control circuit includes a resistor R3 connected to the MOS driver chip, one end of the resistor R3 is connected in parallel with a resistor R4, a power tube Q2, and a diode D3 and a diode D4 arranged in series, a capacitor C2 is connected between the source and the drain of the power tube Q2, the capacitor C2 is connected in parallel with the capacitor C4, and the source of the power tube Q2 is connected to the drain of the power tube Q1.

[0009] Preferably, a capacitor C6 is connected in parallel to the input side of the transformer T1 , and a capacitor C7 is connected in parallel to the output side of the transformer T1 .

[0010] Preferably, the current acquisition unit comprises a current transformer, a resistor R5 is connected between the positive and negative electrodes of the current transformer, and one end of the current transformer is connected to the single-chip microcomputer via an operational amplifier U1A.

[0011] Preferably, each group of the power modules includes a rectifier BD1 connected to the output side of the transformer T1, and the rectifier BD1 is connected in parallel with a capacitor C21, resistors R21 and R22 arranged in series, capacitor C22 and resistor RL1, the connecting end of the resistor R21 and the resistor R22 is connected to the switch tube VT2, the emitter of the switch tube VT2 is connected to the switch tube VT1, and the connecting end of the switch tube VT2 and the switch tube VT1 is connected to one end of the capacitor C22, a diode D6 is connected between the emitter of the switch tube VT2 and the other end of the capacitor C22, the collector of the switch tube VT2 and the collector of the switch tube VT1 are connected through a resistor R23, and the connecting end of the resistor R23 and the switch tube VT1 is connected to an end of the resistor R21 away from the resistor R22.

[0012] Preferably, the energy output unit includes an oscillation circuit and an energy output core electrically connected to the oscillation circuit, the energy output core is installed between the capacitor C3 and the first PWM control circuit, and the oscillation circuit is connected to both the first PWM control circuit and the second PWM control circuit.

[0013] Preferably, the oscillation circuit includes an op amp chip U3, a negative terminal of the op amp chip U3 is connected in parallel with a resistor R33 and a resistor R34, one end of the resistor R34 is connected in parallel with a diode D8, a resistor R35 and a diode D7, the connecting ends of the diode D8, the resistor R35 and the diode D7 are connected to the output end of the op amp chip U3, the positive terminal of the op amp chip U3 is respectively connected with a resistor R31, a capacitor C31 and a capacitor C32, one end of the capacitor C31 and one end of the resistor R31 are both grounded, and one end of the resistor R32 is connected to the output end of the op amp chip U3 through the resistor R32.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model cooperates with a control unit, a MOS drive unit, an energy output unit, a current collection unit and a power supply unit, uses a single-chip microcomputer to control the output PWM wave, and drives the first PWM control circuit and the second PWM control circuit to be turned on in turn, so that the inductive load can output energy and detect the output current of the power inductor at the same time, thereby achieving a waveform with large alternating current, high voltage output and high inductive load rate at a relatively low cost.

[0016] 2. The single-chip microcomputer of the utility model is powered by one power module to ensure the stability of the power supply of the single-chip microcomputer. The MOS driving unit is powered by two power modules. When one of the power modules is damaged, the device can still work normally, thereby improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a circuit diagram of the utility model;

[0018] Figure 2 This is the circuit diagram of the power module of the utility model;

[0019] Figure 3 The utility model is a circuit diagram of an oscillating circuit.

[0020] In the figure: 1. control unit; 2. current collection unit; 3. MOS drive unit; 4. energy output unit; 5. power supply unit; 6. current transformer; 7. energy output core. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-3 The utility model provides a technical solution: an alternating large current and high voltage output device, comprising a control unit 1, a MOS drive unit 3, an energy output unit 4, a current collection unit 2 and a power supply unit 5, wherein the power supply unit 5 comprises a transformer T1 and three groups of power modules connected in parallel with the output side of the transformer T1, wherein two groups of power modules are connected to the MOS drive unit 3, the control unit 1 comprises a single chip microcomputer with a built-in PWM module, another group of power modules is connected to the single chip microcomputer, the two ends of the single chip microcomputer are electrically connected to the MOS drive unit 3 and the current collection unit 2 respectively, the energy output unit 4 is connected between the MOS drive unit 3 and the power supply unit 5; the single chip microcomputer is powered by one power module to ensure the stability of the power supply of the single chip microcomputer, the MOS drive unit 3 is powered by two power modules, when one of the power modules is damaged, the device can still work normally, thereby improving the reliability of the system.

[0023] The input side of the transformer T1 is connected in parallel with a capacitor C6, and the output side of the transformer T1 is connected in parallel with a capacitor C7. The input side signal and the output side signal of the transformer T1 are filtered by the capacitor C6 and the capacitor C7 respectively, thereby improving the stability of the signal transmission of the transformer T1.

[0024] The current acquisition unit 2 includes a current transformer 6, a resistor R5 is connected between the positive and negative electrodes of the current transformer 6, one end of the current transformer 6 is connected to the single-chip microcomputer through the operational amplifier U1A, and the output loop current of the MOS driving unit 3 is detected through the current transformer 6. The current transformer 6 detects the size of the output inductance waveform, and the operational amplifier U1A determines whether the power inductance output reaches the nearest effect. The best output is that the conduction frequency of the power tube is close to the resonant frequency of the power inductor and the power capacitor in series. If the resonant frequency is not reached, the waveform of the detection loop received by the single-chip microcomputer is relatively low. At this time, the single-chip microcomputer will adjust the output frequency accordingly. Through multiple adjustments, the entire circuit is finally satisfied to achieve resonance and high-efficiency output.

[0025] The MOS driving unit 3 includes a MOS driving chip and a first PWM control circuit and a second PWM control circuit connected to the MOS driving chip, one end of the first PWM control circuit is connected to an energy storage capacitor C3, one end of the second PWM control circuit is connected to an energy storage capacitor C4, and one end of the energy storage capacitor C3 is connected to one end of the energy storage capacitor C4, and the other end of the energy storage capacitor C3 and the other end of the energy storage capacitor C4 are both connected to two of the power supply modules.

[0026] The first PWM control circuit includes a resistor R1 connected to the MOS driver chip, one end of the resistor R1 is connected in parallel with a resistor R2, a power tube Q1, and a diode D1 and a diode D2 arranged in series, a capacitor C1 is connected between the source and the drain of the power tube Q1, and the capacitor C1 is connected in parallel with a capacitor C3.

[0027] The second PWM control circuit includes a resistor R3 connected to the MOS driver chip, one end of the resistor R3 is connected in parallel with a resistor R4, a power tube Q2, and a diode D3 and a diode D4 arranged in series, a capacitor C2 is connected between the source and the drain of the power tube Q2, the capacitor C2 is connected in parallel with the capacitor C4, and the source of the power tube Q2 is connected to the drain of the power tube Q1.

[0028] The single-chip microcomputer outputs PWM waves through its own PWM module, driving the two power tubes to conduct in turn. In the first cycle, power tube Q1 is turned on and power tube Q2 is turned off. The energy on the energy storage capacitor C3 is output to the inductive load (on the energy output magnetic core 10), and energy storage is formed between the energy storage capacitor C3 and the energy storage capacitor C4 and the power supply module. In the second cycle, power tube Q1 is turned off and power tube Q2 is turned on. At this time, the energy stored in the energy storage capacitor C4 is output to the inductive load (on the energy output magnetic core 10) and then output to the negative pole of the power supply through the power tube Q2. The energy is completed once, which effectively increases the number of times the inductor works in the entire circuit and improves the efficiency of energy utilization.

[0029] Each group of the power modules includes a rectifier BD1 connected to the output side of the transformer T1, and the rectifier BD1 is connected in parallel with a capacitor C21, a resistor R21 and a resistor R22 arranged in series, a capacitor C22 and a resistor RL1, a connecting end of the resistor R21 and the resistor R22 is connected to a switch tube VT2, an emitter of the switch tube VT2 is connected to the switch tube VT1, and a connecting end of the switch tube VT2 and the switch tube VT1 is connected to one end of the capacitor C22, a diode D6 is connected between the emitter of the switch tube VT2 and the other end of the capacitor C22, a collector of the switch tube VT2 is connected to a collector of the switch tube VT1 through a resistor R23, and a connecting end of the resistor R23 and the switch tube VT1 is connected to an end of the resistor R21 away from the resistor R22, the rectifier BD1 is used to rectify the voltage output by the transformer T1, and then the voltage output by the rectifier BD1 is filtered through the capacitor C21, and then output through a voltage stabilization output circuit composed of the switch tube VT1, the switch tube VT2 and the resistor RL.

[0030] The energy output unit 4 includes an oscillating circuit and an energy output magnetic core 7 electrically connected to the oscillating circuit. The energy output magnetic core 7 is installed between the capacitor C3 and the first PWM control circuit. The oscillating circuit is connected to both the first PWM control circuit and the second PWM control circuit.

[0031] The oscillation circuit includes an amplifier chip U3, the negative terminal of the amplifier chip U3 is connected in parallel with a resistor R33 and a resistor R34, one end of the resistor R34 is connected in parallel with a diode D8, a resistor R35 and a diode D7, the connection end of the diode D8, the resistor R35 and the diode D7 is connected to the output end of the amplifier chip U3, the positive terminal of the amplifier chip U3 is respectively connected with a resistor R31, a capacitor C31 and a capacitor C32, one end of the capacitor C31 and one end of the resistor R31 are both grounded, one end of the resistor R32 is connected to the output end of the amplifier chip U3 through the resistor R32, and when the power module starts to supply power, due to the presence of the capacitor C32 and the capacitor C31, the two input ends of the amplifier will feel different voltage change rates in the initial stage. This is because the capacitor hinders the direct current in the initial stage of charging, resulting in a slow rise in voltage; as the capacitor C32 is gradually charged, the voltage at both ends of the capacitor C32 begins to increase, and the voltage at the positive input end of the amplifier also increases accordingly. At this time, the operational amplifier begins to amplify the voltage difference between the positive input terminal and the negative input terminal, and the output voltage is fed back to the negative input terminal through the feedback network (including capacitor R33, capacitor R34, diode D8, capacitor R35, and diode D7). Due to the presence of diodes D8 and D7, the current in the feedback network can only flow in one direction, which ensures that the circuit can be charged and discharged correctly in each cycle.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An alternating high current and high voltage output device, characterized in that: The invention comprises a control unit (1), a MOS drive unit (3), an energy output unit (4), a current collection unit (2) and a power supply unit (5), wherein the power supply unit (5) comprises a transformer T1 and three groups of power supply modules connected in parallel to the output side of the transformer T1, wherein two groups of power supply modules are connected to the MOS drive unit (3), the control unit (1) comprises a single-chip microcomputer with a built-in PWM module, and another group of power supply modules is connected to the single-chip microcomputer, wherein two ends of the single-chip microcomputer are electrically connected to the MOS drive unit (3) and the current collection unit (2) respectively, and the energy output unit (4) is connected between the MOS drive unit (3) and the power supply unit (5); The MOS drive unit (3) comprises a MOS drive chip and a first PWM control circuit and a second PWM control circuit connected to the MOS drive chip, one end of the first PWM control circuit is connected to an energy storage capacitor C3, one end of the second PWM control circuit is connected to an energy storage capacitor C4, one end of the energy storage capacitor C3 is connected to one end of the energy storage capacitor C4, and the other end of the energy storage capacitor C3 and the other end of the energy storage capacitor C4 are both connected to two of the power supply modules.

2. The alternating high current and high voltage output device according to claim 1, characterized in that: The first PWM control circuit includes a resistor R1 connected to the MOS driver chip, one end of the resistor R1 is connected in parallel with a resistor R2, a power tube Q1, and a diode D1 and a diode D2 arranged in series, a capacitor C1 is connected between the source and the drain of the power tube Q1, and the capacitor C1 is connected in parallel with a capacitor C3.

3. The alternating high current and high voltage output device according to claim 2, characterized in that: The second PWM control circuit includes a resistor R3 connected to the MOS driver chip, one end of the resistor R3 is connected in parallel with a resistor R4, a power tube Q2, and a diode D3 and a diode D4 arranged in series, a capacitor C2 is connected between the source and the drain of the power tube Q2, the capacitor C2 is connected in parallel with the capacitor C4, and the source of the power tube Q2 is connected to the drain of the power tube Q1.

4. The alternating high current and high voltage output device according to claim 3, characterized in that: A capacitor C6 is connected in parallel to the input side of the transformer T1 , and a capacitor C7 is connected in parallel to the output side of the transformer T1 .

5. The alternating high current and high voltage output device according to claim 4, characterized in that: The current collection unit (2) comprises a current transformer (6), a resistor R5 is connected between the positive and negative electrodes of the current transformer (6), and one end of the current transformer (6) is connected to the single-chip microcomputer via an operational amplifier U1A.

6. The alternating high current and high voltage output device according to claim 5, characterized in that: Each group of the power modules includes a rectifier BD1 connected to the output side of the transformer T1, and the rectifier BD1 is connected in parallel with a capacitor C21, a resistor R21 and a resistor R22 arranged in series, a capacitor C22 and a resistor RL1, a connecting end of the resistor R21 and the resistor R22 is connected to a switch tube VT2, an emitter of the switch tube VT2 is connected to a switch tube VT1, and a connecting end of the switch tube VT2 and the switch tube VT1 is connected to one end of the capacitor C22, a diode D6 is connected between the emitter of the switch tube VT2 and the other end of the capacitor C22, a collector of the switch tube VT2 is connected to a collector of the switch tube VT1 through a resistor R23, and a connecting end of the resistor R23 and the switch tube VT1 is connected to an end of the resistor R21 away from the resistor R22.

7. The alternating high current and high voltage output device according to claim 6, characterized in that: The energy output unit (4) comprises an oscillating circuit and an energy output magnetic core (7) electrically connected to the oscillating circuit, the energy output magnetic core (7) being installed between the capacitor C3 and the first PWM control circuit, and the oscillating circuit being connected to both the first PWM control circuit and the second PWM control circuit.

8. The alternating high current and high voltage output device according to claim 7, characterized in that: The oscillation circuit includes an operational amplifier chip U3, a negative terminal of the operational amplifier chip U3 is connected in parallel with a resistor R33 and a resistor R34, one end of the resistor R34 is connected in parallel with a diode D8, a resistor R35 and a diode D7, the connecting ends of the diode D8, the resistor R35 and the diode D7 are connected to the output end of the operational amplifier chip U3, the positive terminal of the operational amplifier chip U3 is respectively connected to a resistor R31, a capacitor C31 and a capacitor C32, one end of the capacitor C31 and one end of the resistor R31 are both grounded, and one end of the resistor R32 is connected to the output end of the operational amplifier chip U3 through the resistor R32.

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