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Staggered type power factor correction circuit and control method thereof

A power factor correction and control method technology, applied in the direction of output power conversion devices, electrical components, high-efficiency power electronics conversion, etc., can solve problems such as large system errors, reduce measurement errors, improve system reliability, and ensure current balanced effect

Active Publication Date: 2014-09-10
GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims to provide an interleaved power factor correction circuit and its control method to solve the problem of large system errors introduced by many electrical signal measurement points in the prior art

Method used

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  • Staggered type power factor correction circuit and control method thereof
  • Staggered type power factor correction circuit and control method thereof
  • Staggered type power factor correction circuit and control method thereof

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Embodiment Construction

[0027] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0028] An embodiment of the present invention provides an interleaved power factor correction circuit, figure 2 is a schematic diagram of an interleaved power factor correction circuit according to an embodiment of the present invention, such as figure 1 As shown, the interleaved power factor correction circuit includes a first boost conversion unit and a second boost conversion unit, the first boost conversion unit includes a first switch tube Q1, a first inductor L1 and a first diode D1, The second boost conversion unit includes a second switch tube Q2, a second inductor L2 and a second diode D2, wherein the first inductor L1 is charged when the first switch tube Q1 is turned on, and the fi...

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Abstract

The invention provides a staggered type power factor correction circuit and a control method thereof. The control method provided by the invention comprises: respectively acquiring a first current value and a second current value, the first current value being the input current value of the staggered type power factor correction circuit when a first switch tube is conducted, the second current value being the input current value of the staggered type power factor correction circuit when a second switch tube is conducted; acquiring an output voltage value, and calculating to obtain an input voltage estimation value by use of a state observer; calculating a first target duty ratio and a second target duty ratio, the first target duty ratio being the target duty ratio of the control signal of the first switch tube, the second target duty ratio being the target duty ratio of the control signal of the second switch tube; and according to the first target duty ratio, sending a first control signal to the first switch tube, and according to the second target duty ratio, sending a second control signal to the second switch tube. The technical scheme provided by the invention reduces measuring errors and reduces hardware complexity.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an interleaved power factor correction circuit and a control method thereof. Background technique [0002] An existing interleaved parallel power factor correction circuit (Power Factor Correction, PFC) is generally composed of two or more boost conversion units. figure 1 It is a circuit topology diagram of a two-unit interleaved PFC in the prior art, wherein the first boost conversion unit includes a first inductor L1, a first switch tube Q1, and a first diode D1, and the second boost conversion unit includes a second Inductor L2, second switch tube Q2, and second diode D2. [0003] In the specific interleaved PFC of the above circuit, the AC power supply Vac of the rectification circuit is converted into a DC input Vin, and the PFC circuit passes through the on-off of the switch tube to charge and discharge the first inductor L1, the second inductor L2, and the capacitor C to ...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCY02B70/126Y02B70/10
Inventor 孙丰涛胡晰怡吕向前杨帆孙泉良
Owner GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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