Current-fed high power pulsed current source

Abstract

The invention relates to a current feed type high-power pulse current source. The current feed type high-power pulse current source comprises an input rectifying circuit, an active power factor correction circuit and a Buck current feed full-bridge unit which are connected in sequence; the active power factor correction circuit and the Buck current feed full-bridge unit are also connected with a control unit; the input rectifying circuit is used for converting an external mains supply into a direct current; the control unit controls the active power factor correction circuit to output a required stable voltage; and the control unit collects the output current of the Buck current feed full-bridge unit, and adjusts the Buck circuit PWM duty ratio of the Buck current feed full-bridge unit according to the output current so as to enable the current pulse output by the Buck current feed full-bridge unit to track the reference pulse of the control unit. The current feed type high-power pulse current source is simple in circuit structure, and capable of effectively reducing the size of the power supply, avoiding danger of straight through of the full-bridge circuit, relieving the problem at the on-off moments of the switching tube, and improving the power supply efficiency and the reliability.

Description

technical field [0001] The invention relates to a current source, in particular to a current-feeding high-power pulse current source, which belongs to the technical field of pulse current sources. Background technique [0002] At present, the commonly used pulse current sources can be divided into sawtooth wave, trapezoidal wave, triangle wave and sawtooth wave according to their external characteristics. The pulse power supply has strict requirements on the pulse waveform. As a test system power supply, the pulse power supply must not only ensure the stable output of the pulse current, but also consider the pulse amplitude, width, rising edge time, falling edge time and repetition frequency. The current source of semiconductor test equipment is generally a rectangular wave. The adjustment range and accuracy of various parameters are the key to measuring the quality of a test power supply, and these are the difficulties in the design of this type of power supply. [0003] S...

AI Technical Summary

Problems solved by technology

[0008] 1) The most traditional method is to use the energy storage element to discharge. The discharge time can be controlled by the switch tube. The circuit of this method is relatively simple, but the waveform quality is difficult to control, and the parameters of the current pulse are not easy to adjust.

[0009] 2) In order to adjust the output pulse, a special discharge circuit is required, which increases the complexity of the system and loses the simplicity of this method

[0010] 3) In order to avoid the impact on the energy storage components, a special isolated charging circuit is required, which further increases the complexity of the system

[0011] 4) In the case of a large output current pulse amplitude, the volume of the energy storage element will also increase, and the charging circuit will limit the current resistance, further increasing the energy consumption of the system

[0013] 1) In the application of low voltage and high current, the direct chopper step-down voltage difference is large, so the device withstand voltage requirements are high

[0014] 2) The higher the withstand voltage, the lower the switching frequency of the device, which is not conducive to the miniaturization of the power supply. At the same time, the direct chopping power supply works in a hard switching state, the power supply efficiency is difficult to guarantee, and the EMI problem is more serious.

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