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Method for inhibiting harmonic current

A harmonic current and peak current technology, applied in the field of power factor correction circuit, can solve problems such as increased design and production costs, increased EMI electromagnetic interference, etc., to achieve the effects of suppressing harmonic components, raising DC side voltage, and improving power factor

Inactive Publication Date: 2008-09-24
SHANDONG LONGERTEK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this solution will increase the design and production costs, and the EMI electromagnetic interference will also increase a lot

Method used

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  • Method for inhibiting harmonic current
  • Method for inhibiting harmonic current
  • Method for inhibiting harmonic current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, as shown in FIG. 6, the power factor correction circuit applying the harmonic current suppression method has a bridge rectifier 2 connected across the input end of the AC power supply 1, and a bridge rectifier 2 connected in series at the output side of the bridge rectifier 2 in sequence. Reactor 3, rectification and filtering device 5 and load 6.

[0038]A switch device 4 is designed across the positive and negative terminals of the bridge rectifier 2, a zero-cross detection device 11 connected to the AC power supply end, an overcurrent protection device 12 connected in series between the switch devices 4, connected to the DC The voltage detection device 7 on the side is connected to the switch drive device 9 of the switch device 4 , the current detection device 10 , the MCU chip 8 and the storage device 13 .

[0039] In the described harmonic current suppression method, when the input voltage is at the zero-cross point of the positive and negative half c...

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PUM

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Abstract

The invention provides the harmonic current restraining method. It provides the changing of the load current value based on the positive, negative cycle, the comparative MCU module is applied to control the opening, breaking estate of the switch setting connecting the two outputs of the bridge rectifier and the accounting empty percentage during the shutting estate, so the restraining harmonic wave, the improving of the power factor and the raise of the direct current side voltage can be realized. The controlling switch is on the state of the cutting during the first controlling time segment t1; the MCU controlling chip controlling switch can conduct the high frequent switch between the state of the shutting and the cutting during the second controlling time section t2; the switch is cutting during the third controlling time section t3, so the current through the loading depresses and the rises, and it can tend to the second peak value current V2 gradually. The MCU controlling chip controlling switch can conduct the high frequent switch between the state of the shutting and the cutting during the four controlling time section t4.

Description

technical field [0001] The invention is a harmonic suppression method using a bridge-type full-wave rectifier circuit, specifically the method is applied to a power factor correction circuit. Background technique [0002] At present, power factor correction circuits are equipped in office and household inverter air conditioners, in order to realize the adjustment of the input AC voltage to DC voltage to ensure the normal operation of the DC compressor. In existing power factor correction circuits, a bridge full-wave rectifier circuit is usually used to realize functions such as rectification, smoothing capacitor voltage stabilization and frequency conversion. [0003] The existing power factor correction circuit shown in Figure 1 uses an AC power supply, a rectifier circuit and a smoothing capacitor, and uses frequency conversion signals to control the operation of the frequency conversion compressor. When the AC voltage is a positive half cycle, the current flows in the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
Inventor 李敬恩胡文生张永利
Owner SHANDONG LONGERTEK TECH CO LTD
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