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Household appliance and PFC circuit thereof

A circuit and buffer absorption circuit technology, which is applied in the field of household appliances and their PFC circuits, can solve the problems of electromagnetic compatibility EMC exceeding the standard and affecting circuit functions, etc.

Inactive Publication Date: 2016-12-07
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the actual application circuit, because the power switch tube IGBT is turned on and off at the moment, and the fast recovery diode is at the forward conduction and reverse recovery moment, there will be a huge current change (Di / Dt) and voltage change (Du / Dt), the instantaneous energy of the switch will be transmitted in the form of conduction, and a propagation loop will be formed by factors such as distributed capacitance, which will cause the electromagnetic compatibility EMC to exceed the standard, and in severe cases, it will also affect the circuit function

Method used

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  • Household appliance and PFC circuit thereof
  • Household appliance and PFC circuit thereof
  • Household appliance and PFC circuit thereof

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Embodiment Construction

[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0034] For household appliances, in order to meet the test requirements of the sales market, a snubber circuit is usually added to the fast recovery diode in the PFC circuit, which is formed by a series of resistors and capacitors (for example, Rb=10ohm, Cb=150pF), and its parameters The value can be adjusted according to the circuit parameters.

[0035] figure 2 It is a structural illustration of a PFC circuit with a snubber circuit added. Such as figure 2 As shown, Vbd is the input voltage of the PFC circuit, that is, the input voltage of the PFC inductor L after the AC power passes through the rectifier bridge. pfc Vce is the tube voltage drop of the po...

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Abstract

The invention relates to the field of household appliances, and discloses a household appliance and a PFC circuit thereof. The PFC circuit comprises a noise generating device for generating high-frequency noise and an absorbing buffering circuit connected with the noise generating device in parallel and used for inhibiting generated high-frequency noise. In this way, the high-frequency PFC circuit can be adopted in the household appliance, the EMC requirements can be met, and the size of the circuit is reduced.

Description

technical field [0001] The present invention relates to household appliances, in particular to a household appliance and a PFC circuit thereof. Background technique [0002] For high-power household appliances (such as inverter air conditioners), in order to improve the efficiency of power use, reduce the interference of high-power household appliances to the grid, and improve the adaptability of electrical appliances to grid interference, active power is usually added to the electronically controlled rectifier circuit and filter capacitor. PFC circuit (power factor correction circuit), the PFC primary adjustment converter can output a basically stable DC voltage to increase the current conduction angle, and its power correction factor can reach 0.99, so that the current waveform can track the voltage waveform throughout the cycle . [0003] There are various topologies of PFC circuits, and the working modes are also different. Such as figure 1 As shown, in the prior art,...

Claims

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Application Information

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IPC IPC(8): H02M1/34H02M1/42
CPCH02M1/34H02M1/4208Y02B70/10
Inventor 文先仕
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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