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PFC circuit, PFC control circuit and switch power source

A control circuit and circuit technology, which is applied in high-efficiency power electronic conversion, electrical components, energy industry, etc., can solve problems such as complex control circuit structure, and achieve the effect of simple circuit, low cost and easy realization

Active Publication Date: 2016-12-07
MORNSUN GUANGZHOU SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the above-mentioned problem of complex structure of the control circuit, and provides a PFC circuit, so that under the same output ripple, the present invention can use a smaller output capacitor, and the control circuit is simple, the cost is lower, and it is easy to be practical

Method used

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  • PFC circuit, PFC control circuit and switch power source
  • PFC circuit, PFC control circuit and switch power source
  • PFC circuit, PFC control circuit and switch power source

Examples

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no. 1 example

[0040] The first embodiment of the present invention is as figure 2 shown. A switching power supply, comprising an AC-DC power supply circuit and a PFC control circuit, wherein the AC-DC power supply circuit comprises a BD1 rectifier circuit and a voltage conversion circuit 101, the voltage conversion circuit 101 is also a main power circuit, and the PFC control circuit is located between the rectification circuit and the voltage conversion circuit 101. Between the voltage conversion circuits; the PFC control circuit includes an input detection circuit 102, a waveform shaping circuit 103, an output detection circuit 104, and a feedback control circuit 105. The input detection circuit 102 detects the rectified bus voltage and provides a reference voltage for the feedback control circuit Waveform; Output detection circuit 104 detects the voltage output by the voltage conversion circuit, and provides an output sampling voltage for the feedback control circuit; The feedback contr...

no. 2 example

[0061] In Embodiment 1, input in a wide range, such as the common input voltage range of 85V to 265V, figure 2 The shape of the voltage waveform at point A will change. In the first embodiment, only one zener diode is used to chop the input sampling voltage. If the input voltage changes, the relative position of the cut is different, and the obtained waveform shape of point A is also different. When the input voltage is 85V and 265V respectively, figure 2 The voltage waveform at point A is as follows Figure 7 shown. When the input voltage is high, the relative position of the cut wave is lower, and the difference with the original sine wave is greater, the PF value will be lower, but the output ripple will be smaller.

[0062] In order to make the working state change insignificantly when inputting high and low voltage. presents a second embodiment of the circuit as Figure 8 shown. Compared with Embodiment 1, the waveform shaping circuit 103 is different in that a co...

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Abstract

The invention relates to the field of switch power sources and specifically relates to a PFC circuit capable of reducing output capacitance, a PFC control circuit and a switch power source in which the PFC control circuit is adopted. The PFC circuit provided in the invention comprises a PFC control chip; a feedback control circuit is integrated on the PFC control chip and is used for receiving input sampling voltage of an input detection circuit and output sampling voltage of an output detection circuit, the feedback control circuit is also used for outputting control signals for controlling a work mode of a voltage conversion circuit, the PFC control chip has a reference voltage end and is characterized by additionally comprising a waveform shaping circuit which is used for truncating a wave crest of input sampling signals, and the waveform shaping circuit is externally connected between the reference voltage end of the PFC control chip and earth. Compared with technologies of the prior art, the PFC circuit, the PFC control circuit and the switch power source are advantaged by circuit simplicity, low cost and easy-to-realize property.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a PFC circuit capable of reducing output capacitance, a PFC control circuit and a switching power supply using the PFC control circuit. Background technique [0002] With the development of electronic technology, the requirements for switching power supply are getting higher and higher, and switching power supply is required to have a longer life, smaller size and lower cost. As we all know, the current life of electrolytic capacitors is only a few thousand hours to tens of thousands of hours, and the life will be shorter at high temperatures. Electrolytic capacitors are widely used in AC-DC switching power supplies, and electrolytic capacitors are the most important components that determine the life of switching power supplies. Electrolytic capacitors have the advantages of large capacity per unit volume and low cost. At present, other capacitors such as film capacitor...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/4225H02M1/0003Y02B70/10Y02P80/10
Inventor 苏俊熙黄天华
Owner MORNSUN GUANGZHOU SCI & TECH
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