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Power factor improver circuit with function of PFC (power factor correction)

A power factor and circuit technology, applied in the field of switching power supply, can solve the problems of large drop in PF value at full load, ineffective use of electric energy, excessive apparent power, etc., and achieve the effect of improving the ability to correct waveforms

Inactive Publication Date: 2015-04-08
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For some special applications such as battery or capacitor charging power supply, a 300W FTU (feeder automation terminal) with a 10W load has higher requirements for apparent power, which must be lower than 20VA. If the power factor is not enough under light load High may cause the apparent power to exceed the standard, and at the same time, the power factor is not high under light load and the electric energy cannot be used effectively
[0009] To sum up, the existing boost power factor correction circuit has certain deficiencies when working under light load conditions, and its PF value drops relatively compared with full load, which further leads to an increase in the apparent power of the product. In some applications that require high apparent power occasions, the existing circuit will not meet the requirements

Method used

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  • Power factor improver circuit with function of PFC (power factor correction)
  • Power factor improver circuit with function of PFC (power factor correction)
  • Power factor improver circuit with function of PFC (power factor correction)

Examples

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no. 1 example

[0024] image 3 A schematic circuit diagram of a PFC power factor boosting circuit according to the first embodiment of the present invention is shown. A PFC power factor boosting circuit 201 is connected between an AC input rectifier circuit 101 and a PFC power circuit 301 .

[0025] The boosting circuit 201 includes a first capacitor, the positive pole of the first capacitor is connected to the positive output terminal of the rectifier circuit, the negative pole of the first capacitor is connected to the negative output terminal of the rectifier circuit; the second capacitor and the first switch are connected, and the positive pole of the second capacitor is connected to the rectifier circuit. The positive output terminal of the circuit is simultaneously connected to the positive pole of the first capacitor, the negative pole of the second capacitor is connected to one end of the first switch, the other end of the first switch is connected to the negative output terminal of t...

no. 2 example

[0038] Figure 5 It shows the schematic circuit diagram of the PFC power factor boosting circuit of the second embodiment, a PFC power factor boosting circuit 201 ′, which is connected between the AC input rectifying circuit 101 and the PFC power circuit 301 .

[0039] The circuit 201' includes a capacitor C1 and a capacitor C2, the positive pole of the capacitor C1 is connected to the positive output terminal of the rectifier circuit, the negative pole of the capacitor C1 is connected to the positive pole of the capacitor C2, and also connected to one end of the switch S1, and the negative pole of the capacitor C2 is connected to the other end of the switch S1 One end is connected to the negative output end of the rectifier circuit.

[0040] The working principle of the circuit 201' for improving the power factor of the PFC circuit under light load conditions is as follows:

[0041] After the circuit is energized for the first time, the input AC power passes through the rect...

no. 3 example

[0049] Such as Figure 6 Shown is the circuit schematic diagram of the power factor boosting circuit of the PFC of the third embodiment of the present invention, a kind of power factor boosting circuit 201 ", differs from the first embodiment in that it also includes a resistor R1, one end of the resistor R1 The capacitor C2 is connected to the positive output end of the rectification circuit, and the other end of the resistor R1 is connected to the negative output end of the rectification circuit through the switch S1.

[0050] Since the resistor R1 is added to the drain branch of the MOS tube, the damage to the MOS tube caused by the high peak current when the switch S1 and the capacitor C2 are directly shorted is avoided, and the MOS tube is protected to a certain extent.

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Abstract

The invention discloses a power factor improver circuit with a function of PFC (power factor correction). The circuit comprises a control circuit and a switch circuit. By detecting the power, the switch circuit is controlled under light load, rectifier capacitance is decreased, the ability of the PFC circuit to correct waveform is greatly improved, a PF value of the PFC circuit being in light load is increased, and apparent power is decreased.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a power factor boosting circuit with power factor correction (PFC). Background technique [0002] Industrial and civil fields often need to convert the AC voltage of the grid into DC, or even isolated DC, and the work of completing this conversion is usually realized by a switching power supply. The input circuit of the switching power supply connected to the grid is usually composed of half-wave or full-wave The circuit and the energy storage capacitor behind it, the capacitor stores enough energy to keep its voltage close to the peak voltage of the input sine wave until the next peak voltage arrives to charge it again, usually this process is very short compared to the entire sine cycle, generally Between 10% and 20% of the sinusoidal period, the charging current pulse in this case must have enough energy to maintain the voltage on the capacitor between the two pulses, w...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/4225Y02B70/10
Inventor 宋建峰刘勇刚郑凌霄
Owner MORNSUN GUANGZHOU SCI & TECH
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