Double step-up/double step-down combined AC/AC converting circuit

A conversion circuit and double step-down technology, applied in the field of AC-AC frequency conversion technology, can solve the problems of PWM AC-AC conversion circuit reliability and conversion efficiency, the existence of direct short circuit of the switch tube, large reverse recovery loss, etc., to achieve The circuit structure and control scheme are simple, the dynamic response is fast, and the effect of eliminating possibility

Inactive Publication Date: 2008-11-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this circuit topology is: the switch tubes are connected in series, and there is a hidden danger of the switch tubes being short-circuited.
At the same time, the freewheeling diode of this circuit is the paras

Method used

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  • Double step-up/double step-down combined AC/AC converting circuit
  • Double step-up/double step-down combined AC/AC converting circuit
  • Double step-up/double step-down combined AC/AC converting circuit

Examples

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Example Embodiment

[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0030] figure 1 It is a circuit diagram of a double-boost / double-buck combined AC-AC conversion circuit, including a power supply 2, a first boost bridge arm circuit 1, a second boost bridge arm circuit 3, a first step-down bridge arm circuit 5, and a second boost bridge arm circuit 5. Two step-down bridge arm circuits 7, an intermediate DC link circuit 4, and an output filter circuit 6, the intermediate DC link circuit includes a first capacitor C 1 and a second capacitor C 2 , the first capacitance C 1 with the second capacitor C 2 connected in series, and the series connection point is grounded, the first step-up bridge arm circuit 1 includes a first power switch tube S 1 , the first inductance L 1 , the first diode D 1 , the first power switch S 1 The source of the first diode D 1 The cathode of the two joints is connected to the fir...

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Abstract

Disclosed is dual booster/dual buck combination AC-AC conversion circuit which belongs to the AC-AC frequency conversion technology. The circuit includes a power supply, two booster bridge circuits (1, 3), two buck bridge circuits (5, 7), a DC section circuit (4) in the middle and an output filtering circuit (6). The two booster bridge circuits form a dual booster PWM rectifying circuit; the second booster bridge circuit works at the positive half cycle of the input current and the first booster bridge circuit works at the negative half cycle of the input current. The two buck bridge circuits form the dual buck circuit; the first buck bridge circuit works at the positive half cycle of the input current and the second buck bridge circuit works at the negative half cycle of the input current. The dual booster PWM rectifying circuit and the dual buck circuit all adopt the current hysteresis control method which has the ability of automatic current limit and has fast dynamic response. The dual booster/dual buck combination AC-AC conversion circuit of the invention is suitable for the medium and large power field with high efficiency, such as the airplane frequency conversion power supply, UPS, new energy electricity generation which have unified surge control and active filtering.

Description

technical field [0001] The invention relates to a dual boost / double buck combined AC-AC conversion circuit, which belongs to the AC-AC frequency conversion technology in electric energy conversion devices. Background technique [0002] At present, the frequency conversion AC power supply technology has many advantages such as fewer system components, simple structure, high efficiency, light weight, small size, low cost, high reliability, and good maintainability. Compensation (SVG), unified power flow controller (UPFC), superconducting magnetic energy storage (SMES), four-quadrant AC motor drive, grid-connected power generation of renewable energy such as solar energy and wind energy, active power filter (APF), large-capacity UPS And many other occasions have been widely used. [0003] In modern aircraft, the variable frequency AC power system has replaced the traditional variable speed constant frequency power system and constant speed constant frequency power system. Bec...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/219H02M7/5387
Inventor 陈杰陈家伟龚春英
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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