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Double buck/boost two-way AC chopper

A chopper and switch technology, applied in the field of two-way AC chopper, can solve the problems of many power devices, increase the complexity of the circuit, complex control, etc., and achieve the effect of eliminating the generation of circulating current, small circuit loss, and simple control

Inactive Publication Date: 2007-05-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bidirectional switch used in this type of converter is obtained through the combination of a unidirectional blocking MOS device and a diode in practice, and there are many options, which makes the number of power devices in this type of converter larger, which also increases circuit complexity
Strict commutation sequence must be followed during switch commutation, the control is complicated, and there are large voltage spikes during switch tube commutation
The switching tube commutation problem is a difficult point in the realization of AC / AC converters
Moreover, almost all traditional AC choppers can only realize one type of step-down conversion or step-up conversion.

Method used

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  • Double buck/boost two-way AC chopper
  • Double buck/boost two-way AC chopper
  • Double buck/boost two-way AC chopper

Examples

Experimental program
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Embodiment Construction

[0015] As shown in Figure 1, the dual buck / boost bidirectional AC chopper of this embodiment includes a capacitor C connected to the ground by one end 1 The power supply circuit 1 formed in parallel with the AC sinusoidal voltage power supply also includes a first buck / boost circuit 2 and a second buck / boost circuit 4. In the first buck / boost circuit 2, the first switch S 1 The anode of the power supply circuit 1 is connected to the output end of the first switch S 1 cathode of the second switch S 2 The cathode is connected and passed through the first inductor L 1 ground; in the second buck / boost circuit 4, the third switch S 3 The cathode of the power supply circuit 1 is connected to the output end of the third switch S 3 anode of the fourth switch S 4 The anode is connected and passed through and the second inductor L 2 ground; the second switch S in the first buck / boost circuit 2 2 The anode of and the fourth switch S in the second buck / boost circuit 4 4 The cathode...

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PUM

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Abstract

The invention relates to a buck / boost bidirectional alterative-current chopper, which comprises power circuit formed by capacitor with one end connected to ground and one parallel alterative-current sine voltage power source; the first buck / boost circuit, and the second buck / boost circuit. The invention has the advantages that: the whole circuit has non arm direct connection, to solve current diversion; and it can realize voltage-decrease voltage-increase AC / AC conversion, to bidirectional transmit energy; and it has low circuit consumption with simple control; and it outputs average voltage value or effective loop-close adjustment.

Description

1. Technical field [0001] The invention relates to an AC-AC converter, in particular to a bidirectional AC chopper. 2. Background technology [0002] AC-AC conversion, as an important part in the field of power electronics technology, has received a lot of research in recent years. The research hotspots of traditional AC / AC direct converters are mainly in the two categories of matrix converters and high-frequency AC link AC / AC converters. The matrix converter has the advantages of good input current waveform, high input power factor, low harmonic pollution, and high efficiency, but its circuit structure is very complicated and difficult to control, which limits its practical application. The high-frequency AC link AC / AC converter also has the problem of complicated circuit and control. In recent years, AC / AC direct conversion based on DC / DC simple topology has been paid attention to and researched. The basic idea is to realize the bidirectional power switch, so that the ba...

Claims

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Application Information

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IPC IPC(8): H02M5/257G05F1/40
Inventor 洪峰蔡兆奇於俊严仰光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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