Three-phase APFC correction circuit and method and air conditioner

A technology for correcting circuit and three-phase voltage, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc. Simple, easy-to-use effects

Pending Publication Date: 2018-07-17
AUX AIR CONDITIONING LTD BY SHARE LTD
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  • Abstract
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Problems solved by technology

[0002] At present, three-phase power inverter air conditioners have been widely used, but there will be problems of power harmonics in the process of using them.
In order to solve this technical problem, the prior art generally uses a three-phase APFC (active power factor correction) control circuit, which requires sampling the current and voltage signals of the three-phase power supply, but because the current signal and the control circuit do not share the same ground, Therefore, the prior art generally uses isolated current sensors (S1\S2) to sample the three-phase circuit. Obviously, the device cost of the three-phase APFC control circuit will be very high.

Method used

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  • Three-phase APFC correction circuit and method and air conditioner
  • Three-phase APFC correction circuit and method and air conditioner
  • Three-phase APFC correction circuit and method and air conditioner

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Embodiment Construction

[0059] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0060] At present, the prior art generally uses isolated current sensors (S1\S2) to sample the three-phase circuit, which has the problem of high cost. In view of this, the present invention provides a kind of correction circuit, method and air conditioner of three-phase APFC, need not use current sampler, only need at least two resistances (because the three-phase current adds up to be 0, when there are three resistances , it can also be obtained to verify whether the three-phase current is accurate; when there are two resistors, the circuit can be simplified and the operation is convenient), the voltage on the resistor can be obtained by processing the circuit, and then combined with the three-phase current to add to zero, through the operation The size of the three-phase current can be obtained, the structu...

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Abstract

The invention provides a three-phase APFC correction circuit and method and an air conditioner. The three-phase APFC correction circuit comprises: three-phase voltage sources for providing three-phasealternating current; three first bridge arms, wherein one end of each first bridge arm is connected with each of the three-phase voltage sources, and the other ends of at least two first bridge armsare connected with one resistor; and a processing circuit connected to at least two resistors for determining current flowing through the at least two resistor in one PWM period and further obtainingthe three-phase current of the three-phase alternating current. The sampling of the three-phase current is improved, and the three-phase current can be determined by the current on the at least two resistors, thereby avoiding the use of the current sensor, and achieving the sinusoidalization of the three-phase current while saving cost.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a three-phase APFC correction circuit, method and air conditioner. Background technique [0002] At present, three-phase power inverter air conditioners have been widely used, but there will be problems of power harmonics during their use. In order to solve this technical problem, the prior art generally uses a three-phase APFC (active power factor correction) control circuit, which requires sampling the current and voltage signals of the three-phase power supply, but because the current signal and the control circuit do not share the same ground, Therefore, the prior art generally adopts isolated current sensors (S1\S2) to sample the three-phase circuit, obviously, the component cost of the three-phase APFC control circuit will be very high. Contents of the invention [0003] In view of this, the present invention aims to propose a correction circuit, method and air ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02M1/4216H02M1/4233Y02B70/10
Inventor 游剑波李超
Owner AUX AIR CONDITIONING LTD BY SHARE LTD
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