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PFC (positive feedback circuit) control circuit

A technology for controlling circuits and circuits, applied in emergency protection circuit devices, electrical components, sustainable manufacturing/processing, etc., can solve problems such as device damage and large circuit loss

Inactive Publication Date: 2014-08-13
SHENZHEN INCREASE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the relay at the input end is disconnected at this time, the active PFC is still in the normal working state. The circuit loss is one aspect. More importantly, the input voltage is in an abnormal state at this time. Therefore, the PFC is working in a dangerous state at this time. In the state, it is easy to damage the main power tube of PFC, the main control chip and other important components

Method used

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  • PFC (positive feedback circuit) control circuit
  • PFC (positive feedback circuit) control circuit
  • PFC (positive feedback circuit) control circuit

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Embodiment Construction

[0014] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

[0015] The most critical idea of ​​the present invention is to control the relay control circuit 15 through the impedance conversion circuit 11, the AC undervoltage hysteresis comparison circuit 12, the AC overvoltage hysteresis comparison circuit 17 and the AC undervoltage reverse circuit 13. At the same time, when the relay controls When the circuit 15 is disconnected, the driving signal of the PFC control chip 20 is pulled down through the third diode 22, thereby protecting the PFC control chip 20 and the PFC main power device.

[0016] Explanation of terms involved in the present invention

[0017] Impedance transformation circuit: The impedance transformation circuit is mainly used to increase the impedance of the input end and reduce...

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PUM

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Abstract

The invention discloses a PFC (positive feedback circuit) control circuit which comprises a voltage sampling circuit, an impedance transformation circuit, an alternating current undervoltage hysteresis comparison circuit, an alternating current overvoltage hysteresis comparison circuit, an alternating current undervoltage reversing circuit, a PFC control chip, a driving circuit and a relay control circuit, wherein the voltage sampling circuit, the impedance transformation circuit, the alternating current undervoltage hysteresis comparison circuit and the alternating current undervoltage reversing circuit are connected in series in sequence; the alternating current overvoltage hysteresis comparison circuit is connected to the output end of the impedance transformation circuit; the alternating current undervoltage reversing circuit and the alternating current overvoltage hysteresis comparison circuit are respectively connected with the relay control circuit through a first diode and a second diode; the control output end of the PFC control chip is connected to the input end of the driving circuit; the input end of the relay control circuit is connected with a negative electrode of a third diode; a positive electrode of the third diode is connected to the control output end of the PFC control chip. The PFC control circuit disclosed by the invention can prevent a PFC from being burned.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a PFC control circuit. Background technique [0002] PFC is the meaning of "power factor correction", which is mainly used to characterize the utilization efficiency of electric energy by electronic products. The higher the power factor, the higher the utilization efficiency of electric energy. [0003] There are two types of PFC, one is passive PFC (also called passive PFC), and the other is active PFC (also called active PFC). Passive PFC generally uses the inductance compensation method to reduce the phase difference between the fundamental current and voltage of the AC input to improve the power factor, but the power factor of the passive PFC is not very high, and can only reach 0.7~0.8; the active PFC consists of Composed of inductors, capacitors and electronic components, it is small in size and can achieve a high power factor. [0004] In the existing active PFC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02H7/00H02H7/20
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 王灿何勇志
Owner SHENZHEN INCREASE TECH CO LTD