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Input-voltage-self-adaption-based current frequency limiting method and apparatus of PFC circuit

An input voltage and current technology, applied in output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of AC fan speed drop, device heating, device damage, etc., to reduce input current and reduce output. power, the effect of improving heat generation

Active Publication Date: 2015-12-23
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology

However, similarly, compared with normal AC voltage, when the input voltage is low, the amplitude of the input current input to the PFC circuit increases, causing serious heating of the devices in the input circuit. cause device damage

Method used

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  • Input-voltage-self-adaption-based current frequency limiting method and apparatus of PFC circuit
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  • Input-voltage-self-adaption-based current frequency limiting method and apparatus of PFC circuit

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Embodiment Construction

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0023] The following describes the current frequency limiting method and device for adapting the input voltage of the power factor correction PFC circuit in the inverter air conditioner proposed by the embodiment of the present invention with reference to the accompanying drawings, wherein the single-phase AC power is rectified by the rectifier circuit and then input to the power factor correction PFC (PowerFactorCorrection, power factor correction) circuit.

[0024] according to Figure 2-4 As an example, the power supply devic...

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Abstract

The invention discloses an input-voltage-self-adaption-based current frequency limiting method and apparatus of a power factor correction (PFC) circuit in a variable-frequency air conditioner. The output terminal of the PFC circuit is connected with a load being a compressor. The method comprises the following steps: obtaining a voltage effective value Vin_rms and a current effective value Iin_rms; obtaining a current frequency-limiting threshold value based on the input voltage effective value Vin_rms and controlling the compressor according to the current effective value Iin_rms and the current frequency-limiting threshold value; and controlling the compressor to carry out frequency-reduction operation when the current effective value Iin_rms being larger than the current frequency-limiting threshold value. Therefore, the output power is reduced; an objective of input current reduction is achieved; the heating situation of the input circuit is improved; and the system reliability is enhanced.

Description

technical field [0001] The present invention relates to the field of power electronics technology, in particular to a current frequency limiting method for adaptive input voltage of a power factor correction PFC circuit in an inverter air conditioner and an adaptive current frequency limiting method for input voltage of a power factor correction PFC circuit in an inverter air conditioner device. Background technique [0002] In a single-phase AC power input system such as a household air conditioner, the single-phase AC power from the grid usually passes through an uncontrollable full-bridge rectifier circuit first, then passes through a power factor correction circuit, then outputs DC and connects it to a large-capacity electrolytic capacitor, and finally provides it to Loads such as internal switching power supplies, compressors and fans, etc. [0003] The power factor correction circuit can adopt a typical Boost power factor correction circuit, which can not only achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M1/42
CPCY02B70/10
Inventor 黄招彬
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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