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Boost-PFC control circuit and control method thereof

A technology for controlling circuits and main circuits, applied in control/regulating systems, electrical components, regulating electrical variables, etc., and can solve problems such as current imbalance in parallel branches

Pending Publication Date: 2021-04-20
TCL AIR CONDITIONER ZHONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a Boost-PFC control circuit and its control method, which can effectively solve the problem of current imbalance between parallel branches, thereby improving the reliability of the entire circuit

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  • Boost-PFC control circuit and control method thereof

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Embodiment Construction

[0057] The object of the present invention is to provide a Boost-PFC control circuit and a control method thereof, which can effectively solve the problem of current imbalance between parallel branches, and further improve the reliability of the entire circuit.

[0058] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0059] see figure 1 and figure 2 , a kind of Boost-PFC (Boost (boost)-PFC (Power Factor Correction, power factor positive)) control circuit provided by the present invention comprises PFC main circuit 10, control module 20, PWM (Pulse WidthModulation: pulse width modulation) module 30 and a cycle current equalizing module 40, the...

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Abstract

The invention discloses a Boost-PFC control circuit and a control method thereof, the Boost-PFC control circuit comprises a PFC main circuit, a control module, a PWM module and a periodic current sharing module, and the PFC main circuit comprises a first PFC branch and a second PFC branch; the control module outputs a control signal calculated according to the input voltage, the input current and the output voltage of the PFC main circuit to the PWM module; the periodic current sharing module outputs an adjusting signal to the PWM module according to the input current and the first branch current; the PWM module performs current-sharing adjustment on the control signal according to the adjustment signal and then outputs a first driving signal to the first PFC branch and outputs a second driving signal to the second PFC branch; by arranging the periodic current sharing module, the problem of current imbalance between the parallel branches can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of electronic equipment, in particular to a Boost-PFC control circuit and a control method thereof. Background technique [0002] In a Boost (boost)-PFC (Power Factor Correction, positive power factor) converter, since the device parasitic parameters of the two parallel branches cannot be completely the same, there is a deviation in the currents of the two branches. Long-term operation in the state of uneven current will reduce the power factor and shorten the life of the branch with large current, thus affecting the efficiency and life of the entire converter. [0003] Thereby prior art still needs to improve and improve. Contents of the invention [0004] The object of the present invention is to provide a Boost-PFC control circuit and a control method thereof, which can effectively solve the problem of current imbalance between parallel branches, and further improve the reliability of the entire circui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M3/158
CPCY02B70/10
Inventor 邓志坚马争先韩东陈友樟许纹倚陈显京
Owner TCL AIR CONDITIONER ZHONGSHAN CO LTD