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Hardware protection circuit for active PFC (power factor correction)

A hardware protection and circuit technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., to avoid damage, protect safe and reliable, and protect in time.

Active Publication Date: 2014-12-17
HANGZHOU XIANTU ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the requirements of the national "3C" compulsory certification, current harmonic suppression has become a problem that inverter air conditioner manufacturers must solve; because the traditional passive PFC harmonic suppression method cannot solve the high energy efficiency inverter air conditioner products advocated by the country, so active PFC It has gradually become the mainstream solution in the inverter air conditioner industry

Method used

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  • Hardware protection circuit for active PFC (power factor correction)
  • Hardware protection circuit for active PFC (power factor correction)
  • Hardware protection circuit for active PFC (power factor correction)

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Embodiment Construction

[0055]In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the starting point of the present invention is firstly introduced.

[0056] The protection provided by the present invention for the active PFC is realized by a pure hardware circuit, and has the advantages of fast speed, accuracy and reliability compared with the protection mode combining software and hardware in the prior art.

[0057] The protection response time of the combination of software and hardware in the prior art is composed of three parts: hardware detection feedback time, software processing time, and hardware driver processing time; the software processing time includes MCU chip hardware response time and software program operation time, and noise interference, and the noise filtering time needs to be set in the program software (there are differences in this point depending on the noise filtering ability requirements of different...

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Abstract

The invention provides a hardware protection circuit for active PFC (power factor correction). Actuation time of a hardware protection circuit is much shorter than that of a software protection circuit, so that overcurrent or overvoltage can be more timely protected. Both the overcurrent of a power device and the overvoltage (including direct-current voltage and alternating-current voltage) of the whole circuit can be protected, trigger protection is performed on both the overvoltage and the overcurrent, an operation protection module stops transmitting PWM (pulse-width modulation) pulse signals to the power device, the power device is disconnected, and accordingly the power device is prevented from being damaged. Even an MCU (microprogrammed control unit) is slow in responding to processing speed, the PWM pulse signals can still be outputted, and the PWM pulse signals are intercepted by the operation protection module; therefore, the overcurrent or the overvoltage in the PFC circuit can be timely and effectively protected by the hardware protection circuit, and the protection is safer and more reliable.

Description

technical field [0001] The invention relates to the technical field of power factor correction, in particular to an active PFC hardware protection circuit. Background technique [0002] With the improvement of industrial production level and people's living standard, more and more harmonics are generated in the grid by a large number of non-linear electrical equipment, which not only increases the loss of grid power supply, affects the normal operation of grid protection devices, but also The power factor of the electrical equipment is reduced. [0003] Inverter air conditioners are non-linear electrical equipment. Therefore, in order to suppress harmonic generation and improve power factor, power factor correction (PFC, Power Factor Correction) technology is introduced into inverter air conditioners. [0004] The basic idea of ​​PFC is that the input current waveform tends to be as sinusoidal as possible and the phase difference with the input voltage is reduced. [0005]...

Claims

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Application Information

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IPC IPC(8): H02H7/10H02H7/20H02H3/06
Inventor 徐锦清吴佳英
Owner HANGZHOU XIANTU ELECTRONICS
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