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Active power factor correction system

A technology for correcting system and source power, which is applied in the direction of output power conversion device, automatic disconnection emergency protection device, high-efficiency power electronic conversion, etc.

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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Embodiment Construction

[0098] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0099] see figure 1 , which is a schematic diagram of Embodiment 1 of an active power factor correction system provided by the present invention.

[0100] The active power factor correction system provided in this embodiment includes: MCU3 and a first current sampling module 5;

[0101] The first current sampling module 5 is configured to collect a first current signal in the DC power circuit, convert the first current signal into a corresponding first voltage signal and send it to the A / D port of the MCU3;

[0102] The MCU3 is configured to start the first heavy current protection when the current on the DC side exceeds the first current threshold; start the second heavy current protection when the current on the DC side exceeds the ...

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Abstract

The invention provides an active power factor correction system. Through arrangement of double protections, a first current protection is implemented when the current at a DC side exceeds a first current threshold, and a second current protection is implemented when the current exceeds a second current threshold. During the first current protection, the current at the DC side is not too high, when the voltage at an AC power supply passes zero next time, the output of a PWM pulse signal is restored; during the second current protection, the current at the DC side is high already, the output of the PWM pulse signal is stopped and then the PWM pulse signal is output again until a circuit is restored to be in a normal state, the PWM pulse signal output again is a newly adjusted PWM pulse signal, so that the circuit normally runs, and overcurrent is reduced. Current protection using software is more effective than protection using hardware. In this way, the possibility of PFC restarting can be reduced, and the circuit can run more stably and can be protected from being damaged due to overcurrent.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an active power factor correction system. 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] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/32H02H7/125H02H3/06
CPCY02B70/10
Inventor 赵鸣徐锦清
Owner HANGZHOU XIANTU ELECTRONICS
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