Adaptive voltage frequency limiting method and device for input voltage of PFC circuit

A technology of input voltage and voltage, applied in the field of control, can solve the problems of reducing the cooling capacity of the air conditioning system, heating and reducing the device, and achieve the effect of improving safety and reliability

Inactive Publication Date: 2017-05-31
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the normal AC voltage, when the AC voltage amplitude is low, the amplitude of the input current input to the PFC circuit will increase, causing the devices in the input circuit to heat up severely
Especially for air-conditioning systems that use AC fans for heat dissipation, the speed of AC fans decreases as the amplitude of the AC voltage decreases, which reduces the cooling capacity of the air-conditioning system and causes more serious heating of devices in the input circuit

Method used

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  • Adaptive voltage frequency limiting method and device for input voltage of PFC circuit
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  • Adaptive voltage frequency limiting method and device for input voltage of PFC circuit

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Embodiment Construction

[0026] 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.

[0027] The input voltage adaptive voltage frequency limiting method of the PFC circuit, the input voltage adaptive voltage frequency limiting device of the PFC circuit and the household appliances according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0028] according to Figure 2-4 As an example, a power supply device for a household appliance (such as an inverter air conditioner) may include a rectifier circuit 10, a PFC circuit 20, and an electrolytic capaci...

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Abstract

The invention discloses an adaptive voltage frequency limiting method and device for an input voltage of a PFC circuit. An output end of the PFC circuit is connected with a load which is a compressor. The method comprises steps that an effective value of the input voltage of the PFC circuit is acquired; a voltage frequency limiting threshold of the compressor is acquired according to the effective value of the input voltage, the outdoor environment temperature and the indoor environment temperature; the compressor is controlled for realizing frequency limiting operation according to the voltage frequency limiting threshold. The method is advantaged in that the temperature of a heating device of an input circuit and an input current are reduced through adjusting operation frequency of the compressor, and system safety and reliability are improved.

Description

technical field [0001] The invention relates to the field of control technology, in particular to a voltage frequency limiting method for adaptive input voltage of a PFC circuit, a voltage frequency limiting device for adaptive input voltage of a PFC circuit, and a household appliance with the 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 PFC (Power Factor Correction, power factor correction) circuit to output DC power, and then connects to To bulk electrolytic capacitors and loads (such as compressors, fans, internal switching power supplies, etc.). [0003] Among them, the PFC circuit can adopt a typical Boost PFC circuit, which can not only achieve a higher power factor, but also boost and output a stable DC voltage, thereby providing a stable DC power supply to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02M1/4225Y02B70/10
Inventor 黄招彬高军胜刘燕飞
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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