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Method for reducing no-load loss of inverter with two-stage structure

A no-load loss and inverter technology, which is applied in the direction of instruments, electric variable adjustment, output power conversion devices, etc., can solve the problems of low device working efficiency and device failure, achieve high working efficiency and reduce no-load loss , The control method is simple and easy to implement

Inactive Publication Date: 2010-06-09
EAST CHINA JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although these methods can reduce the no-load loss to a certain extent, because in the no-load state, the current flowing through each power device in the inverter circuit is very small, and the device cannot work in the rated design state, which makes the working efficiency of the device still very low. low, while the reduction in no-load loss is still limited

Method used

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  • Method for reducing no-load loss of inverter with two-stage structure
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  • Method for reducing no-load loss of inverter with two-stage structure

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Embodiment Construction

[0040] An embodiment of the present invention is a vehicle-mounted inverter that adopts a method for reducing no-load loss. circuit such as Figure 5 As shown, it mainly consists of the following parts: 12VDC lead-acid battery pack (1); push-pull DC-DC conversion circuit (2); full-bridge DC-AC inverter circuit (3); isolated drive circuit A (4) ; Isolation drive circuit B (5); TMS320C2812 processor (6); Detection and conversion circuit (7).

[0041] 12VDC lead-acid battery pack (1) voltage U in The allowable variation range is 10VDC~14.7VDC.

[0042] Push-pull DC-DC conversion circuit (2) power tube Q 1 and Q 2 Five IRF3205s are used in parallel, the ratio of the primary and secondary sides of the transformer is 2:72, and the diode D 1 ~D 4 RHRP8120 is used. Inductance L s is 1mH. The circuit switching frequency is 30kHz. Intermediate bus capacitance C bus 1000uF / 500VDC, intermediate DC bus voltage U bus The allowable change range is 340VDC ~ 480VDC.

[0043] Power...

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Abstract

The invention relates to a method for reducing no-load loss of an inverter with a two-stage structure. The method is characterized in that a front-stage direct current-direct current (DC-DC) conversion circuit of the inverter with the two-stage structure converts an input voltage Uin into an intermediate DC bus-bar voltage Ubus, and a back-stage direct current-alternate current (DC-AC) inversion circuit reconverts the intermediate DC bus-bar voltage Ubus into an expected output voltage Uo; and a detection circuit is used for detecting the voltage Ubus and the output current Io signal of the inversion circuit and judging by combining a set minimum bus-bar voltage Ubus_min and a rated bus-bar voltage Ubus_nom to control the front-stage DC-DC conversion circuit to work or stop working so as to ensure that the bus voltage Ubus works between the Ubus_min and the Ubus_nom and the front-stage DC-DC conversion circuit obtains higher working efficiency, thereby finally achieving the purpose of reducing the no-load loss of the whole inverter. The method is suitable for the control of reducing the no-load loss of the inverter with the two-stage structure.

Description

technical field [0001] The invention relates to a control method for reducing the no-load loss of a two-stage structure inverter, belonging to the technical field of inverter power supplies. Background technique [0002] An inverter is a device that converts DC power into AC power, and is widely used in photovoltaic power generation, wind power generation, automobiles, ships and electric power. At present, with the development of modern power electronics technology, it is necessary not only to study how to improve the rated efficiency of the inverter, how to improve the light-load efficiency of the inverter, but also to study how to minimize the no-load loss of the inverter. Many foreign manufacturers Some inverter products have listed no-load loss as an important indicator. [0003] The inverter has a single-stage structure and a two-stage structure. The inverter with two-stage structure is usually composed of a DC-DC conversion circuit in the front stage and a DC-AC inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/537
Inventor 袁义生
Owner EAST CHINA JIAOTONG UNIVERSITY
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