PFC inductor saturation suppression circuit and method and power equipment

A technology for suppressing circuit and inductor current, which is applied in the direction of high-efficiency power electronic conversion, electrical components, output power conversion devices, etc., can solve the problems of power device damage and increase cost, and achieve the effect of preventing damage and increasing reliability

Active Publication Date: 2016-03-23
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology

However, in abnormal environments, such as fast switching on and off, frequent power outages, etc., if the PFC inductor is not well matched with the surrounding circuit, it will cause saturation of the PFC inductor, resulting in damage to the power devices in the surrounding circuit.
In order to suppress the saturation of the PFC inductor and prevent damage to

Method used

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  • PFC inductor saturation suppression circuit and method and power equipment
  • PFC inductor saturation suppression circuit and method and power equipment
  • PFC inductor saturation suppression circuit and method and power equipment

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Embodiment Construction

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0029] The present invention detects the voltage at both ends of the PFC inductor and the size of the current flowing through the PFC inductor in real time, and then calculates the PFC inductance value in real time, judges the saturation degree of the inductor through the PFC inductance value, and controls the current flowing through the PFC inductor according to the saturation degree of the inductor. So as to achieve the purpose of suppressing the saturation of the PFC inductor. In terms of hardware implementation, the present invention only needs to add a voltage detection circuit at both ends of the PFC inductor, and the rest of the calculations are realized through software calculations without adding other addit...

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PUM

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Abstract

The invention relates to a PFC inductor saturation suppression circuit and method and power equipment. The circuit comprises a PFC main power circuit, a PFC inductor voltage sampling circuit, a PFC inductor current sampling circuit and a main control module. A PFC inductor value is calculated in real time by detecting voltages at two ends of a PFC inductor and the magnitude of a current which flows through the PFC inductor in real time; the saturation degree of the inductor is judged through the size of the PFC inductor value; and the magnitude of the current which flows through the PFC inductor is controlled according to the inductor saturation degree, so that the target of suppressing PFC inductor saturation is achieved. Only voltage detection circuits are added to two ends of the PFC inductor in the hardware realization aspect; the other operations are achieved through software calculation; and the extra hardware cost does not need to increase. Therefore, compared with an existing PFC inductor saturation suppression technology, the PFC inductor saturation suppression scheme provided by the invention is easy to achieve; and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of PFC power factor correction, in particular to a PFC inductance saturation suppression circuit, method and power supply equipment. Background technique [0002] When the AC power supply is full-wave rectified and filtered by a large capacitor, when the flat DC voltage is directly applied to various converters and their loads, although the waveform of the input voltage is a sine wave, the waveform of the input current is a narrow pulse. , so that the line current contains a large number of harmonic components, and the power factor of the converter is greatly reduced. Extensive use of such power supply equipment will have many adverse consequences. A large number of harmonic currents will cause serious electromagnetic interference and harmonic pollution to the power grid, affect the normal operation of other equipment, cause line failures, and even damage power transmission and distribution equipment. ; Low...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/32
CPCH02M1/32H02M1/4258Y02B70/10
Inventor 管晓文
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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