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LC series resonance high frequency chain matrix-type inverter topology and resonance modulation method thereof

A technology of series resonance and modulation method, applied in the direction of converting AC power input to AC power output, AC power input converting to DC power output, output power conversion device, etc., can solve the problem of adding controllable power tube control, clamping circuit Increase the cost, complex control methods, etc., to achieve the effect of improving circuit reliability and efficiency, avoiding voltage overshoot problems, and low modulation complexity

Inactive Publication Date: 2016-08-31
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are mainly the following safe commutation strategies: ① By adding active clamps to suppress voltage overshoot, soft switching can be realized, but the introduced clamp circuit increases the cost, and the added controllable power tube also makes the control more efficient. Complex; ②The unipolar and bipolar phase-shift control strategy realizes the natural commutation of the inductor current by means of the commutation overlap of the cycloconverter, and realizes the ZVS of the power tube, but there are problems such as difficult control of the commutation overlap time; ③The series resonant circuit is introduced into the front-end inverter to realize the soft commutation of the power tube. At this time, the switching of the power tube is required to occur at the moment of zero current, and the control of the output energy needs to judge the resonant working state of the resonant circuit, which makes the control method complicated
[0004] However, although the above strategy can achieve safe commutation, it makes the modulation and control of the inverter more complex, resulting in reduced system reliability and affecting the popularization and use of this type of converter.

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  • LC series resonance high frequency chain matrix-type inverter topology and resonance modulation method thereof
  • LC series resonance high frequency chain matrix-type inverter topology and resonance modulation method thereof
  • LC series resonance high frequency chain matrix-type inverter topology and resonance modulation method thereof

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing:

[0025] The LC series resonant high-frequency chain matrix inverter topology of the present invention is composed of a full-bridge LC series resonant inverter, a high-frequency transformer T, a matrix converter, and a CL filter connected in sequence; the high-frequency inverter circuit in the front stage of the transformer is introduced LC series resonant tank, the output becomes current-dominated, and the DC input voltage U i Converted to the resonant current i p, coupled by a high-frequency transformer to the secondary side of the transformer, modulated by the matrix converter at the rear stage of the transformer, and filtered by a filter to output a low-frequency sinusoidal voltage U o .

[0026] The full-bridge LC series resonant inverter is powered by a DC input voltage U i , Controllable switch tube S 1 , Controllable switch tube S 2 , Controllable switch tube S ...

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Abstract

The present invention provides a LC series resonance high frequency chain matrix-type inverter topology and a resonance modulation method thereof. The topology comprises of a full bridge LC series resonance inverter, a high-frequency transformer T, a matrix converter and a CL-type filter which are connected in order. The modulation method is configured to process the SPWM wave through separation and link semi-excitation modulation logics to obtain driving signals of a transformer pre-stage LC series resonance inverter and a transformer post-stage matrix converter so as to allow the work duty ratio of the transformer pre-stage resonance circuit excitation resonance work state in the resonance half period to be controllable and realize the control of energy side transmission to the output load. The transformer post-stage matrix converter is modulated and decoupled to two common current-type inverters for controlling, a switch tube performs switching during the zero current outputting to realize zero current switching to avoid causing voltage overshoot problems and realize energy bidirectional flow and four-quadrant operation. The power transformation grades are few, the control method is simple, the circuit stability is high, and the like.

Description

technical field [0001] The invention relates to the field of power electronic power converter modulation and control, in particular to a decoupled coupling half-excitation resonance modulation method for a single-phase LC series resonance type high-frequency chain matrix inverter. Background technique [0002] An inverter is a topological device that converts DC power into AC power. The high-frequency link inverter uses high-frequency transformers instead of power-frequency transformers to overcome the shortcomings of traditional transformers such as large volume, large noise, and high cost. The conversion process of the high-frequency chain matrix inverter has three power characteristics of DC / HFAC / LFAC, among which, HFAC: high-frequency AC, LFAC: low-frequency AC. It can be seen that DC / AC, that is, DC / AC inverter link, appears in this type of inverter, which is located on the primary side of the transformer, and AC / AC, that is, AC / AC conversion link, which is also often ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M5/293
CPCH02M5/293H02M7/53871H02M5/2932
Inventor 闫朝阳秦海宁王洪斌李建霞庞建霞
Owner YANSHAN UNIV
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