Electron beam welding machine power supply high-voltage voltage stabilization method and method employing micro ripper Cuk type converter

Abstract

The invention discloses an electron beam welding machine power supply high-voltage voltage stabilization method and method employing a micro ripper Cuk type converter. The method comprises the following steps: (1), after a three-phase AC power supply is subjected to boosting, rectification and filtering, high voltage is obtained; (2), the high voltage passes through a DC converter, an on-off duty ratio is controlled for adjusting output voltage; (3), the output voltage passes through a PID circuit and a PWM circuit, the duty ratio of a power device is controlled, and the size of the output voltage can be adjusted; and (4), needed voltage is obtained at an output capacitor. The apparatus further comprises a boost rectification filtering circuit, a Cuk main circuit, a control circuit and an output circuit. According to the invention, the Cuk main circuit is introduced in a switch power supply circuit, two inductors of the Cuk circuit are coupled by use of the property of the coupling inductors, the coupling degree of the inductors is reasonably distributed, the circuit ripples are substantially reduced, a feedforward circuit is additionally arranged to enable fluctuations generated at an input end to be directly adjusted from the input end, the control adjustment speed of a whole power supply system is enabled to be higher and more stable, the structure is simple, the control is easy, and the cost is low.

Description

technical field [0001] The invention relates to a high-voltage switching power supply device, in particular to a high-voltage stabilizing method and device for an electron beam welding machine power supply using a micro-ripple Cuk type converter. Background technique [0002] Electron Beam Welding (EBW for short) high-voltage stable power supply is mainly used to provide acceleration voltage for the electron gun, and its performance directly determines the electron beam welding process and welding quality. Its power supply has high efficiency. High energy density. A series of advantages such as wide voltage regulation range have been used more and more widely, but due to its inherent high ripple output voltage, its application range is limited. However, the switching power supply will inevitably produce ripples due to its own structure. Capacitive filtering of high-voltage voltage requires a certain capacitance, but under high-voltage conditions, only small-capacity capaci...

AI Technical Summary

Problems solved by technology

A series of advantages such as wide voltage regulation range have been widely used, but due to its inherent high ripple output voltage, its application range is limited

However, the switching power supply will inevitably produce ripples due to its own structure. Capacitive filtering of high-voltage voltage requires a certain capacitance, but under high-voltage conditions, only small-capacity capacitors can be selected, because the capacitor current of the converter has a large peak current, so it may still be There will be a possibility of capacitor failure. The other is that the frequency of switching devices in high-voltage switching power supplies also has many restrictions, because on the one hand, considering that increasing the switching frequency requires reducing the size of inductors, capacitors, and transformers, this can reduce harmonic content; on the other hand If the switching frequency is too high, it will cause a large switching loss, which will reduce the efficiency of the converter. Therefore, the output ripple has become a key issue in the switching power supply.

[0003] In the prior art, it is one of the commonly used methods to filter output ripple by filtering method. The filter includes active and passive filters. The filter is realized by connecting several resistors and capacitors in parallel or in series in the output circuit. This method Ripple frequency characteristics must be obtained through detailed and rigorous calculations, so as to select accurate resistance and capacitance values. Once the capacitors and resistors fail or the resistance and capacitance calculations are inaccurate, new ripples and noise may be mixed in. , but increases the output ripple. This method is suitable for low-power switching power supplies. There are different losses in high-current and high-power switching power supplies, and the volume of switching power supplies will also increase accordingly.

[0004] Since one of the main factors of switching power supply ripple is the switching on and off of the switching tube

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