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CN-122001210-A - High-voltage pulse charge-discharge circuit, pulse generation circuit and active oscillation suppression circuit

CN122001210ACN 122001210 ACN122001210 ACN 122001210ACN-122001210-A

Abstract

The invention discloses a high-voltage pulse charge-discharge circuit, which comprises a charge loop and a discharge loop. The charging loop is connected in series with a first power supply S1, a diode D0, a capacitor C1, a suppression loop Y2 and a switch Q2, wherein the positive electrode of the diode D0 is connected with the positive electrode of the first power supply, and the negative electrode of the diode D0 is connected with the first electrode of the capacitor C1. The discharge circuit is connected in series with the input terminal, the switch Q1, the suppression circuit Y1, the capacitor C1 and the output terminal, and the anode of the diode D0 is connected to the input terminal and the cathode is connected to the output terminal. The suppression circuit Y1 and the suppression circuit Y2 both comprise a flyback transformer T1 and a feedback circuit F, the primary sides of the flyback transformer T1 are respectively connected in series in the discharging circuit and the charging circuit, the secondary side of the flyback transformer T1 is connected with the feedback circuit F, and the output end of the feedback circuit F is connected with the two ends of the capacitor C1. The suppression loop Y1/Y2 is used for suppressing parasitic oscillation, feeding back energy, reducing the steepness of the upper edge and the lower edge of a pulse, reducing the impact of a device, improving the conversion efficiency and reducing the requirement on the performance of a high-voltage capacitor.

Inventors

  • WANG LIQING

Assignees

  • 苏州卡锐捷电子科技有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (12)

  1. 1. A high voltage pulse charge-discharge circuit, comprising: A charging circuit and a discharging circuit; The charging loop comprises a first power supply S1, a diode D0, a capacitor C1, a suppression loop Y1 and a switch Q1 which are sequentially connected in series, wherein the positive electrode of the diode D0 is connected with the positive electrode of the first power supply S1, and the negative electrode of the diode D0 is connected with the first electrode of the capacitor C1; the discharging loop comprises an input terminal Ti, a switch Q2, a suppression loop Y2, a control circuit, A capacitor C1 and an output terminal, wherein the anode of the diode D0 is connected with the input terminal Ti, and the cathode is connected with the output terminal To; The suppression circuit Y1 and the suppression circuit Y2 comprise flyback transformers T1/T2 and a feedback circuit F, primary sides of the flyback transformers T1/T2 are respectively connected in series in the charging circuit and the discharging circuit, secondary sides of the flyback transformers T1/T2 are connected with the feedback circuit F, and output ends of the feedback circuit F are connected with two ends of a capacitor C1.
  2. 2. The high voltage pulse charge-discharge circuit according to claim 1, wherein the feedback circuit F charges the capacitor C1 when the discharge circuit and the charge circuit are turned on.
  3. 3. The high-voltage pulse charge-discharge circuit according to claim 1 or 2, wherein the feedback circuit F comprises a flyback transformer T3, a primary side of the flyback transformer T3 is electrically connected with a secondary side of the flyback transformer T1/T2, the primary side of the flyback transformer T3 is connected with a half-bridge circuit, and the secondary side is connected with a half-wave rectifying circuit.
  4. 4. The high-voltage pulse charge-discharge circuit according to claim 3, wherein the half-bridge circuit includes a switch Q3/Q4, and an operating frequency and a duty cycle of the switch Q3/Q4 are configured such that an output voltage of the half-wave rectification circuit is less than or equal to an output voltage of the first power source S1.
  5. 5. The high voltage pulse charge-discharge circuit of claim 1, wherein the primary side of the flyback transformer T1/T2 comprises a primary side winding and a diode D1/D2, the primary side winding being connected in series with the diode D1/D2.
  6. 6. A high voltage active oscillation suppression circuit, comprising: The flyback transformer T1/T2 is characterized in that a primary side is connected in series to a charge-discharge loop, the charge-discharge loop comprises parasitic parameters, so that oscillation occurs in the charge-discharge process, and the primary side comprises a primary side winding and a diode which are connected in series; the secondary side of the flyback transformer T1/T2 is electrically connected to the feedback circuit F; the output end of the feedback circuit F is connected to the output capacitor C1 of the charge-discharge loop.
  7. 7. The high voltage active oscillation suppression circuit of claim 6, wherein the charge-discharge loop comprises a loop to charge a capacitor and a loop to discharge a capacitor.
  8. 8. The high voltage active oscillation suppression circuit according to claim 6 or 7, wherein the oscillation energy suppressed by the flyback transformer T1/T2 is converted into a charging voltage for the capacitor C1 by the feedback circuit F.
  9. 9. A high voltage pulse generating circuit, comprising: A first power supply S1; A second power supply S2; n electrical pulse modules, each comprising the high voltage pulse charge-discharge circuit of claim 1, N being a natural number and N >1; A control module, the output terminal of which is connected with the switch Q1 of each electric pulse module Is connected with a switch Q2; the control module is configured to control the N electric pulse modules to be connected in parallel to the first power supply when charging and to be connected in series with the second power supply S2 when discharging.
  10. 10. The high voltage pulse generating circuit according to claim 9, comprising a normal phase pulse generating circuit comprising a first set of said N electrical pulse modules; an inversion pulse generation circuit comprising a second set of said N electrical pulse modules; The control module is configured to output and control the first group of N electric pulse modules and the second group of N electric pulse modules to alternately output inverted pulse voltages Vn and-Vn in one pulse period, and simultaneously output Vs2+Vn, vs2 and Vs2-Vn high-voltage level signals; Where Vs2 is the output voltage of the second power supply S2, and Vn is the series output voltage of the first or second set of the N electric pulse modules.
  11. 11. The high voltage pulse generating circuit according to claim 9, comprising a normal phase pulse generating circuit comprising a first set of said N electrical pulse modules; an inversion pulse generation circuit comprising a second set of said N electrical pulse modules; The control module outputting a multiplexed control signal connected to each of the first and second sets of N electrical pulse modules; the control module is configured to: Controlling the first group of N electric pulse modules to output first phase pulse signals with pulse amplitudes gradually increased in a pulse period, and simultaneously controlling the second group of N electric pulse modules to output second phase pulse signals with pulse amplitudes gradually reduced; or in a pulse period, controlling the first group of N electric pulse modules to output a first phase pulse signal with the pulse amplitude gradually decreasing, and simultaneously controlling the second group of N electric pulse modules to output a second phase pulse signal with the pulse amplitude gradually increasing.
  12. 12. The high voltage pulse generating circuit of claim 11, wherein the first phase pulse signal is a positive high voltage pulse signal and the second phase pulse signal is a negative high voltage pulse signal, or wherein the first phase pulse signal is a negative high voltage pulse signal and the second phase pulse signal is a positive high voltage pulse signal.

Description

High-voltage pulse charge-discharge circuit, pulse generation circuit and active oscillation suppression circuit Technical Field The invention belongs to the field of high-voltage pulse circuits, and particularly relates to an improved technique for suppressing an oscillation signal in a high-voltage pulse circuit. Background High voltage pulse power supplies are widely used in a number of fields. For example: In modern CT, a fast pulse mode is typically used to power a bulb high voltage power supply in order to meet the total X-ray absorption and multi-energy spectral image requirements during diagnosis. In the fields of PFA steep pulse and medical electroporation, a low-power high-frequency high-voltage square wave pulse power supply is widely used. In the field of energy detection, devices such as GPR (geological radar) and FDEM (electromagnetic detector) devices, high-frequency high-voltage square wave pulse power supplies are also required. The traditional high-voltage pulse generator consists of three parts, namely primary energy conversion, intermediate energy storage and pulse formation network. The intermediate energy storage system is mainly divided into electromagnetic energy storage and rotary mechanical energy storage. Electromagnetic energy storage is further divided into capacitive energy storage and inductive energy storage. Disadvantages of rotating machinery energy storage include large volume, heavy weight, low pulse frequency, low power and energy density, limited lifetime and high cost of the energy storage device. Therefore, most application scenes are more prone to adopting an electromagnetic energy storage mode. Although the inductive energy storage system has higher energy density, the inductive energy storage system is easy to oscillate with parasitic capacitance of a load and a transmission line during discharging, and the oscillation energy is huge, so that the control and absorption difficulties are great. In addition, the inductance energy storage is difficult to generate high-frequency square wave pulse, and the control of pulse width and working frequency is not flexible enough, so that the optimal square wave pulse can be achieved only under specific conditions. Therefore, the middle energy storage link of most high-frequency high-voltage pulse square wave power supplies adopts a capacitive energy storage mode. For the pulse output requirement of high voltage (such as more than 80 kV), when a capacitor energy storage form is used, the voltage is usually increased by adopting technologies such as switch series connection, pulse transformer boosting, induced voltage superposition or all-solid-state pulse voltage multiplication. Whichever technique is used, it is required to be connected to the load, and the problem of resonance or self-oscillation with the parasitic parameters of the load and the parasitic parameters of the transmission line easily occurs. Conventional approaches typically employ resistive or inductive suppression to address these issues. Resistance suppression, while limited by rise and fall times, results in limited pulse shape and pulse generator power, and increases the volume of the pulse generator and the cost of the cooling system due to large resistive power losses, is simple and reliable to implement, has less impact on pulse duty cycle and frequency, and is therefore widely used. The inductance suppression oscillation is suitable for high-frequency high-voltage application with fixed pulse width and adjustable frequency. Although the loss is lower, the switching-on loss of the semiconductor switch can be reduced, and the semiconductor switch has higher economic benefit, the oscillation problem can occur when the pulse is switched off, and the pulse output superposition voltage can also be caused to rise the triangular wave when the pulse is switched on. This solution can be used in applications where waveform requirements are not high. Therefore, a new technical scheme is needed to solve the oscillation problem of the inductance of the capacitor energy storage and the parasitic capacitance of the load, and simultaneously solve the problems of loss and heating and the problem of inflexible control of the pulse width and the working frequency. Disclosure of Invention The invention is particularly suitable for solving the oscillation problem generated by parasitic inductance and load parasitic capacitance in the high-voltage pulse circuit, improving the efficiency of the pulse circuit and reducing the heating of the system. The invention provides a high-voltage pulse charge-discharge circuit which comprises a charge loop and a discharge loop, wherein the charge loop comprises a first power supply S1, a diode D0, a capacitor C1, an active oscillation suppression loop Y1 and a switch Q1 which are sequentially connected in series, the positive electrode of the diode D0 is connected with the positive electrode of the first power supply S1, and the negative