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Method and device for improving reliability of digital PFC (Power Factor Correction) circuit

A reliability and circuit technology, applied in the field of AC/DC power conversion, can solve the problems of excessive inductor current and Bus voltage, loop out of control, and inability to respond quickly, and achieve the effect of reducing electrical stress and improving reliability.

Active Publication Date: 2016-04-06
ZTE CORP
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Problems solved by technology

But when the input voltage and output load have a continuous dynamic change similar to the input voltage power frequency period, due to the delay control characteristics of the digital PFC, it cannot respond to the dynamic change as quickly as the analog control, which will make the loop Out of control, the inductor current and Bus voltage exceed the normal value, and in severe cases, it will cause the bomber to malfunction

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  • Method and device for improving reliability of digital PFC (Power Factor Correction) circuit

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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049] Taking the switching power supply used in the communication field as an example, due to the complex and changeable field application environment, the input voltage and output load may sometimes change dynamically. As mentioned above, due to the delay control characteristics of digital PFC, it will cause a large PFC inductor current and Bus voltage in dynamic state.

[0050] The invention discloses a method for improving the reliability of a digital PFC circuit, including a Bus overvoltage protection strategy. In this Bus overvoltage protection strategy, a secondary protection method is used...

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Abstract

The invention discloses a method and a device for improving reliability of a digital PFC (Power Factor Correction) circuit. The method comprises a Bus over voltage protection strategy, a PFC inductor over current protection strategy and a PFC inductor current reducing strategy. The Bus over voltage protection strategy adopts a secondary protection mode; the PFC inductor over current protection strategy adopts a pulse-by-pulse current limiting protection strategy; and the PFC inductor current reducing strategy adopts a strategy of reducing a pulse-by-pulse current limiting point in the pulse-by-pulse case and zeroing a loop intermediate variable when an inductor current reference value is larger than a specific value. The device of the invention is corresponding to the method. On the premise of ensuring the normal operation of a rectifier at a steady state, Bus over voltage and inductor over current can be timely protected, the electric stress of the PFC device can be significantly reduced in the case of dynamic input and output switching, and the reliability of the rectifier power device is improved.

Description

technical field [0001] The invention belongs to the technical field of alternating current / direct current (AC / DC, Alternating Current / Direct Current) power conversion, and in particular relates to a method and a device for improving the reliability of a digital power factor correction (PFC, PowerFactorCorrection) circuit. Background technique [0002] The PFC circuit plays a great role in improving the transmission efficiency of the power grid and reducing the harmonic pollution of the power grid. Most of the current single-phase PFC control schemes are based on the average current control strategy of the Boost converter. [0003] Typical Boost digital PFC control block diagram, such as figure 1 As shown, the whole system consists of two parts, the main circuit and the control circuit. The main circuit consists of a single-phase bridge rectifier and a direct current / direct current (DC / DC, DirectCurrent / DirectCurrent) Boost converter. The control circuit is composed of a d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02H7/125H02M7/12H02M1/32
CPCH02J3/18H02M1/4225H02J3/1892Y02E40/30Y02B70/10
Inventor 王静思杨运东王明金王鸿高养怀程志荣
Owner ZTE CORP
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