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Method and device for improving reliability of digital pfc circuit

A reliability and circuit technology, applied in the field of AC/DC power conversion, can solve the problems of loop runaway, inductance current and Bus voltage exceeding, unable to respond quickly, etc., to achieve the effect of improving reliability and reducing electrical stress

Active Publication Date: 2019-09-06
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 circuit
  • Method and device for improving reliability of digital pfc circuit
  • Method and device for improving reliability of digital pfc circuit

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Embodiment Construction

[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 device for improving the reliability of a digital PFC circuit. The method of the invention includes a Bus overvoltage protection strategy, a PFC inductor overcurrent protection strategy, and a PFC inductor current reduction strategy; wherein, the Bus overvoltage protection strategy adopts a two-level Protection method, the PFC inductor overcurrent protection strategy adopts the strategy of wave-by-wave current limiting protection, and the strategy of reducing the PFC inductor current strategy adopts the strategy of reducing the wave-by-wave current limit point when the wave is wave-by-wave, and clearing the intermediate variable of the loop when the inductor current reference is greater than a certain value. . The apparatus of the present invention corresponds to the method. Under the premise of ensuring the steady state and normal operation of the rectifier, the invention can not only protect the Bus overvoltage and the inductor overcurrent in time, but also significantly reduce the electrical stress of the PFC device when the input and output are switched dynamically, and improve the reliability of the rectifier power device.

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, Power Factor Correction) 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 is composed of a single-phase bridge rectifier and a direct current / direct current (DC / DC, Direct Current / Direct Current) Boost converter. The control circuit is composed...

Claims

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Application Information

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Patent Type & Authority Patents(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