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A control method and device for an interleaved parallel bcm Boost PFC converter

A converter and parallel technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, control/regulation system, etc., can solve the problems of interleaving loss, input switching ripple, etc., and achieve both reliability and reliability sexual effect

Active Publication Date: 2022-06-21
BEIJING DYNAMIC POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the above solution, the current upper limit and lower limit of the second converter are adjusted after filtering through the difference adjustment circuit until the phase difference meets expectations, and it takes several or dozens of switching cycles to reach a steady state. As a result, the interleaving is missing during start-up, and the two inductor currents are even superimposed in phase, resulting in severe switching ripple at the input

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  • A control method and device for an interleaved parallel bcm Boost PFC converter
  • A control method and device for an interleaved parallel bcm Boost PFC converter
  • A control method and device for an interleaved parallel bcm Boost PFC converter

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Embodiment 2

[0089] see figure 1 As shown, the control device of the interleaved parallel BCM Boost PFC converter provided by the embodiment of the present invention at least includes: a digital controller, a first boost circuit and a second boost circuit, the first boost circuit and the second boost circuit The boosting circuits are connected in parallel, the first boosting circuit includes a first switching device, and the second boosting circuit includes a second switching device;

[0090] The digital controller is used for:

[0091] receiving a first boost circuit start-up signal instruction, and sending a first turn-on signal to the first switch device to turn on the first switch device;

[0092] When the first turn-on signal is delayed by half a switching period, a second turn-on signal is sent to the second switch device of the second boost circuit to turn on the second switch device.

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Abstract

The embodiment of the present invention discloses a control method and device for an interleaved parallel BCM Boost PFC converter, which relates to the technical field of switching power supplies, and can maintain a good 180° phase shift of two boost units working in interleaved parallel connection, taking into account the critical conduction The reliability of the pattern and the stability of the 180° phase difference. It includes: the digital control unit receives the first step-up circuit starting signal instruction, and sends the first conduction signal to the first switching device, so that the first switching device is turned on; after the first conduction signal is delayed by half At the moment of the switching period, a second conduction signal is sent to the second switch device of the second boost circuit, so as to conduct the second switch device. The invention is applicable to boost type Boost PFC converter and switching power supply.

Description

technical field [0001] The present invention relates to the technical field of switching power supplies, in particular to a control method and device for an interleaved parallel BCM (critical conduction mode) Boost PFC converter (Power Factor Correction Converter, commonly referred to as a PFC converter). Background technique [0002] The power factor correction converter is an important device for switching power supply to reduce harmonic pollution and reactive power pollution to the power grid. The interleaved parallel BCM Boost PFC converter is widely used in the input stage of switching power supply. The interleaved operation reduces the PFC converter ripple current on both the input and output stages, and the current ripple frequency is twice the single-circuit ripple frequency, which can simplify EMI filter specifications. The current flowing through each channel is halved, which reduces the conduction loss and switching loss of the switching element, which is benefici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42H02M7/219H02M3/158H02M1/36
CPCY02B70/10
Inventor 赵秀峰周迎锋
Owner BEIJING DYNAMIC POWER CO LTD