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Alternating-current chopped wave main circuit structure for diode follow current

A technology of AC chopping and diodes, applied in the direction of converting AC power input to AC power output, electrical components, output power conversion devices, etc., can solve the problem of increasing and limiting AC chopping frequency, untimely freewheeling of chopper switches, etc. problem, to achieve the effect of simple requirements and improved reliability

Inactive Publication Date: 2015-03-25
韩亚兰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The freewheeling scheme adopted at present is to realize the freewheeling by connecting the electronic switch in parallel behind the AC chopper switch component to realize the freewheeling; that is to say, regardless of the specific structure of the chopper switch circuit, it is necessary The freewheeling switch 2 should be connected to the circuit after the chopping switch 1; the chopping switch and the freewheeling switch both use IGBT switching elements, and it takes time to turn on and off the IGBT switching elements, and in order to prevent the freewheeling switch 2 from leading It may cause a short circuit to the circuit after chopping. It is necessary to control the control signals of the chopping electronic switch and the freewheeling switch very precisely, and it is also necessary to set a Interval time, commonly known as "dead time", because of the "dead time", it will cause the freewheeling of the chopper switch to be untimely when it is turned off, and because the "dead time" needs to be set, the AC chopping Further frequency increases are limited
When performing three-phase AC chopping, it is also necessary to control the phase of the control signal of the chopping electronic switch and the freewheeling electronic switch more precisely and complexly

Method used

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  • Alternating-current chopped wave main circuit structure for diode follow current
  • Alternating-current chopped wave main circuit structure for diode follow current
  • Alternating-current chopped wave main circuit structure for diode follow current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like Figure 2 to Figure 9 As shown, the AC chopping is performed by the AC chopping switch component, and the circuit after chopping is divided into a positive half-wave circuit and a negative half-wave circuit. The collector of the AC synchronous switch T1 is connected, the negative half-wave output terminal of the AC chopper switch component is connected with the anode of the diode D2 and the emitter of the AC synchronous switch T2 in turn, and the emitter of the AC synchronous switch T1 is connected with the collector of the AC synchronous switch T2 The electrodes are all connected to one end of the filter capacitor, the positive pole of the diode D1 is connected to the negative pole of the freewheeling diode D2 and then connected to the other end of the filter capacitor and the neutral line of the mains, the gate of the AC synchronous switch T1 is connected to the AC synchronous switch The high potentials of the gate control voltage of T2 appear alternately, and ar...

Embodiment 2

[0037] like Figure 10 As shown, the difference between this embodiment and Embodiment 1 is that an inductance coil L is connected in series between the emitter of the AC synchronous switch T1 and the connection point of the AC synchronous switch T2 and the connection point between the filter capacitor 4 and the load 5; The coil L is used to filter the sine wave output from the junction point of the emitter of the AC synchronous switch T1 and the AC synchronous switch T2, so that the load can obtain a purer AC voltage.

Embodiment 3

[0039] like Figure 11As shown, the difference between this embodiment and Embodiment 1 and Embodiment 2 is that the connection point formed by the positive half-wave output terminal of the AC chopper switch assembly 1 and the cathode of the diode D1 is connected to the collector of the AC synchronous switch T1 An inductance coil L1 is connected in series between them, and an inductance coil L2 is connected in series between the connection point formed by the negative half-wave output terminal of the AC chopper switch assembly 1 and the anode of the diode D2 and the emitter of the AC synchronous switch T1. The inductance coil L1 is used to filter the positive half-wave current output by the AC chopper switch assembly, and the inductance coil L2 is used to filter the negative half-wave current output by the AC chopper switch assembly, so that the filtering ability of the present invention is stronger, and the waveform of the output AC power is more accurate. for perfection.

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Abstract

The invention discloses an alternating-current chopped wave main circuit structure for diode follow current. The structure mainly solves the problems that in the prior art, follow current of alternating-current chopped waves is not in time and further improvement of chopped wave frequency is limited. The structure mainly comprises an alternating-current chopped wave main circuit and a load, wherein the alternating-current chopped wave main circuit comprises an alternating-current chopped wave switch assembly, diodes D1 and D2 having the follow current function, alternating-current synchronous switches T1 and T2 having the convergence function and the isolation function, a filter capacitor C and an alternating-current load RL. According to the structure, two diodes and two alternating-current synchronous switches are adopted so that the purpose for performing in-time follow current on positive semi-waves and negative semi-waves of the alternating-current chopped waves can be achieved through circuit connection; because in-time follow current is performed on a chopped wave switch when the chopped wave switch is turned off each time and it is not needed to set dead time again, the chopped wave frequency can be further improved, and the purpose for improving the performance of the alternating-current chopped wave circuit is achieved.

Description

technical field [0001] The invention relates to the technical field of AC chopping and voltage regulation of mains power, and relates to a diode freewheeling AC chopping main circuit structure. Background technique [0002] See figure 1 , AC chopping is the best technical form to realize the mains voltage regulation transformation. When the load connected after AC chopping is inductive, due to the effect of inductive reactance, it must be performed when the chopping switch is turned off. Freewheeling. The freewheeling scheme adopted at present is to realize the freewheeling by connecting the electronic switch in parallel behind the AC chopper switch component to realize the freewheeling; that is to say, regardless of the specific structure of the chopper switch circuit, it is necessary The freewheeling switch 2 should be connected to the circuit after the chopping switch 1; the chopping switch and the freewheeling switch both use IGBT switching elements, and it takes time ...

Claims

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Application Information

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IPC IPC(8): H02M5/293
CPCH02M5/293H02M5/2932H02M5/2935
Inventor 韩亚兰
Owner 韩亚兰