Natural freewheeling alternating current chopper main circuit structure
A technology of AC chopping and main circuit, which is applied in the direction of converting AC power input to AC power output, converting to DC without intermediate conversion, electrical components, etc. Wave frequency increase and other issues, to achieve improved reliability, simple structure, good effect
Inactive Publication Date: 2012-07-04
韩亚兰
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Problems solved by technology
The freewheeling scheme adopted at present is to realize the freewheeling by connecting the electronic switch in parallel after the AC chopper switch to realize the freewheeling; that is to say, regardless of the specific structure of the chopper switch circuit, it is necessary Few should be connected to the freewheeling switch 2 on 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 The conduction 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 electronic switch very accurately, and it must also be at the moment when the chopping electronic switch is turned off and the freewheeling electronic switch is turned on. Set an interval time between them, commonly known as "dead time", with "dead time", it will cause the freewheeling of the chopper electronic switch to be untimely when it is turned off, and because of the need to set the "dead time", The further increase of the frequency of AC chopping is 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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[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0028] The first embodiment of the present invention: as Figure 2 to Figure 7 As shown, a natural freewheeling AC chopper main circuit structure includes an AC chopper main circuit 1 and an inductive load 2 connected to the mains power supply. It is characterized in that the AC chopper main circuit 1 includes a chopper switch Component assembly 3, inductance coils L1, L2, diodes D1, D2, and capacitor C. One end of the two inductance coils L1, L2 is connected to form a connection point. The connection point is connected to one end of the capacitor C. The other end of the inductance coil L1 is connected to the diode The negative pole of D1 is connected in series, the other end of the inductance coil L2 is connected in series with the positive pole of diode D2, the output terminal of the chopper switching element assembly is connected to the positive pole...
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The invention relates to a natural freewheeling alternating current chopper main circuit structure, which is characterized in that the structure comprises an alternating current chopper main circuit connected with a single phase circuit or a three-phase circuit, and an inductive load. The alternating current chopper main circuit comprises a chopper switch element component, inductance coils L1 and L2, diodes D1 and D2, and a capacitance C. The inductance coils L1 and L2 are connected with the diodes D1 and D2 to form a clockwise loop circuit. The loop circuit realizes the natural freewheeling of the chopper current in the two inductance coils when the chopper switch element is switched off.
Description
technical field [0001] The invention relates to the technical field of AC chopping and voltage regulation of mains power, and is a natural 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 after the AC chopper switch to realize the freewheeling; that is to say, regardless of the specific structure of the chopper switch circuit, it is necessary Few should be connected to the freewheeling switch 2 on 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...
Claims
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IPC IPC(8): H02M5/22H02M1/12H02M5/275
CPCG05F1/45H02M5/293H02M5/2932
Inventor 韩亚兰
Owner 韩亚兰