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Three-phase rectifying flat wave circuit

A three-phase rectification and circuit technology, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of complex structure of phase-shifting isolation input transformer, inability to be directly used, large operating loss, etc., to eliminate harmonics and improve voltage Waveform, the effect of reducing capacitance

Inactive Publication Date: 2009-11-18
丁振荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The DC voltage output by the three-phase full-bridge six-pulse rectifier circuit is a pulsating DC voltage. Because the pulsation rate is too large, the valley voltage is 86.6% of the peak voltage, so it cannot be directly used. The existing three-phase full-bridge six-pulse rectifier The circuit generally uses a parallel filter capacitor to smooth the pulsating DC voltage
The realization of these multi-pulse number circuits depends on the phase-shifting isolation input transformer, and the phase-shifting isolation input transformer is the same as the load power to be driven. This kind of high-power phase-shifting isolation input transformer has complex structure, high price and low operating loss. Big

Method used

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  • Three-phase rectifying flat wave circuit
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  • Three-phase rectifying flat wave circuit

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specific Embodiment approach 1

[0019] like figure 1 As shown, a three-phase rectification and smoothing circuit includes a first three-phase full-bridge rectifier 2 , an isolation circuit 1 and a compensation circuit 6 . The input of the isolation circuit 1 is coupled to the input of the first three-phase full-bridge rectifier 2 , and the input of the isolation circuit 1 is also connected to a three-phase power supply; the output of the isolation circuit 1 is coupled to the input of the compensation circuit 6 . The output of the first three-phase full-bridge rectifier 2 is coupled to the output of the compensation circuit 6 . The output of the compensation circuit 6 is equivalent to the correction waveform, the correction waveform is the voltage output by the first three-phase full-bridge rectifier 2 multiplied by -1, plus the amplitude of the input voltage of the first three-phase full-bridge rectifier 2 worth it. The compensation circuit 6 includes a chopper 4, a bypass circuit 5 and a second three-phas...

specific Embodiment approach 2

[0024] like image 3 As shown, the difference between this specific embodiment and the first specific embodiment is that there are two compensation circuits 6 , and each compensation circuit 6 is connected in series. There are two sets of outputs of the isolation transformer, which are respectively coupled to the inputs of the two compensation circuits 6 . The primary connection of the isolation transformer is delta, and the secondary connection is star. Of course, it is also possible to make the secondary connections of the isolation transformers all be delta, and the primary connections to be star. If the voltage output by the second three-phase full-bridge rectifier 3 of each compensation circuit 6 is the same, the secondary side line voltage of the isolation transformer is 6.7% of the primary side line voltage, which can constitute two levels of A, 2A (or B, 2B), If the output voltages of the second three-phase full-bridge rectifiers 3 of each compensation circuit 6 are d...

specific Embodiment approach 3

[0026] The difference between this specific embodiment and the first specific embodiment is that there are three compensation circuits 6 , and each compensation circuit 6 is connected in series. There are three sets of outputs of the isolation transformer, which are respectively coupled with the inputs of the three compensation circuits 6 . The primary connection of the isolation transformer is delta, and the secondary connection is star. Of course, it is also possible to make the secondary connections of the isolation transformers all be delta, and the primary connections to be star. If the voltage output by the second three-phase full-bridge rectifier 3 of each compensation circuit 6 is the same, the secondary side line voltage of the isolation transformer is 4.47% of the original side line voltage, forming three kinds of voltages of A, 2A, and 3A (A=B=C). If the output voltages of the second three-phase full-bridge rectifier 3 of each compensation circuit 6 are different, A...

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Abstract

The invention discloses a three-phase rectifying and smoothing circuit, comprising a first three-phase full-bridge rectifier, an isolation circuit and at least one compensation circuit; the input of the isolation circuit is coupled with the input of the first three-phase full-bridge rectifier, and the The output of the isolation circuit is coupled to the input of the compensation circuit; the output of the first three-phase full-bridge rectifier is coupled to the output of the compensation circuit; the outputs of all the compensation circuits are synthesized to be equivalent to the modified waveform, and the modified waveform is the It is obtained by multiplying the output voltage of the first three-phase full-bridge rectifier by -1 and adding the amplitude of the input voltage of the first three-phase full-bridge rectifier. The invention improves the output voltage waveform, eliminates the harmonic wave and has low cost.

Description

technical field [0001] The invention relates to a three-phase rectifying and smoothing circuit. Background technique [0002] The DC voltage output by the three-phase full-bridge six-pulse rectifier circuit is a pulsating DC voltage. Because the pulsation rate is too large, the valley voltage is 86.6% of the peak voltage, so it cannot be directly used. The existing three-phase full-bridge six-pulse rectifier The circuit generally uses a parallel filter capacitor to smooth the pulsating DC voltage. Only when the rectified pulsating DC voltage pulse is higher than the filter capacitor voltage, the pulsating DC voltage can charge the filter capacitor. This current is a pulse current with a high peak value, which will cause distortion of the AC current. The existing three-phase full-bridge six Pulse rectification circuits generate a large number of input harmonics. In high-power circuits, harmonics can be properly eliminated by using 12-pulse, 16-pulse, 18-pulse, 24-pulse, 30-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
Inventor 丁振荣
Owner 丁振荣