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High power AC-DC conversion circuit

A DC conversion circuit and high-power technology, applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, output power conversion device, etc., can solve the problem of increasing the manufacturing cost of AC-DC conversion circuits, etc. question

Pending Publication Date: 2017-03-22
丁毅
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two types of power factor correction methods will increase the manufacturing cost of the AC-DC conversion circuit

Method used

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  • High power AC-DC conversion circuit
  • High power AC-DC conversion circuit

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Embodiment Construction

[0008] The specific embodiment of the present invention will now be described in conjunction with the accompanying drawings.

[0009] A high-power AC-DC conversion circuit, which includes: a high-voltage rectifier QL for rectifying the mains, and a step-down unit for converting the high-voltage direct current output by the high-voltage rectifier into a low-voltage direct current. It is characterized in that the step-down unit includes Switching tubes Q1, Q2, Q3, Q4, high-frequency transformer T1, the collector of switching tube Q1 is connected to the positive pole of high-voltage direct current, the emitter of switching tube Q1 is connected to one end of the primary coil of high-frequency transformer T1, and the collector of switching tube Q2 is connected to The emitter of the switching tube Q1, the emitter of the switching tube Q2 are connected to the negative pole of the high-voltage direct current, the collector of the switching tube Q3 is connected to the positive pole of t...

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Abstract

The invention provides a high power AC-DC conversion circuit. An H bridge switch circuit is formed by switch tubes Q1, Q2, Q3 and Q4 and the primary coil of a high frequency transformer T1, the switch-on and switch-off of the switch tubes Q1 and Q4 are controlled by a first high frequency square wave signal, the switch-on and switch-off of the switch tubes Q2 and Q3 are controlled by a second high frequency square wave signal, the phases of the first high frequency square wave signal and the second high frequency square wave signal are opposite, thus the output voltage of a high voltage rectifier QL is subjected to inversion, through changing the frequencies of the high frequency square wave signals, the secondary voltage of the high frequency transformer can be changed and thus is stable. According to the circuit structure, the filtering capacitor connected to the output end of the high voltage rectifier QL in parallel can be canceled, the current in a grid always flows into the high frequency transformer in the process of inversion and voltage drop, the input current of the grid has no periodic peak, the input current is smooth, a higher harmonic component is effectively suppressed, and the circuit has a voltage stabilizing function of the secondary voltage of the high frequency transformer.

Description

technical field [0001] The invention relates to a high-power AC-DC conversion circuit, which includes a rectification unit for converting AC power into DC power and a step-down unit for reducing the voltage of the rectified high-voltage DC power. Background technique [0002] Existing high-power AC-DC conversion circuits, such as welding power circuits in DC welding machines, generally include a rectifier and a capacitor filter. The function of the capacitor filter is to make the rectified waveform straight without pulsation. Non-linearity and the energy storage function of the filter capacitor make the input current a periodic peak current with a very short time and high peak value. Fourier analysis of this deformed input current shows that in addition to the fundamental wave, it also contains It contains rich high-order harmonic components, especially the third harmonic, which not only brings a lot of harm to the public power grid, but also increases the loss of input curr...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/14H02M3/335
CPCH02M1/14H02M3/33576H02M7/219
Inventor 丁毅
Owner 丁毅
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