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Low harmonic current power regulating method and apparatus

A technology of power adjustment and low harmonics, which is applied in the field of power adjustment devices, can solve the problems of high harmonic currents, achieve stable current waveforms, improve energy utilization, and have no adverse effects

Inactive Publication Date: 2009-02-04
金丰电子(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for adjusting the power of electrical appliances to solve the problem of excessive harmonic current and avoid other adverse effects on the power grid and controlled electrical appliances

Method used

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  • Low harmonic current power regulating method and apparatus
  • Low harmonic current power regulating method and apparatus
  • Low harmonic current power regulating method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one: see attached Figure 5 And attached Figure 6 As shown, a low harmonic current power adjustment device includes a bridge rectifier circuit, a controllable electronic switch connected in series between the electrical appliance Z and the output terminal of the bridge rectifier circuit, and the control terminal of the controllable electronic switch is connected to a square wave signal A generating circuit, a freewheeling circuit is connected in series between the output terminal of the bridge rectifier circuit and the electrical appliance, the freewheeling circuit is mainly composed of a series connected freewheeling diode and an electrolytic capacitor, the capacitor is connected with a discharge circuit, and the freewheeling diode The reverse end of the discharge circuit is connected to the positive pole of the electrolytic capacitor, and the discharge circuit is a discharge diode connected to the positive pole of the electrolytic capacitor. The reverse en...

Embodiment 2

[0040] Embodiment two: see attached Figure 7 As shown, a low harmonic current power adjustment device is used for power adjustment of the motor, including a bridge rectifier circuit, a controllable electronic switch connected in series between the motor M and the output end of the bridge rectifier circuit, and the controllable electronic switch The control end of the control terminal is connected to a square wave signal generating circuit, and a freewheel circuit is connected in series between the output terminal of the bridge rectifier circuit and the motor, and the freewheel circuit is mainly composed of a series freewheel diode D1 and an electrolytic capacitor C1, and the capacitor A discharge circuit is connected to C1, the reverse end of the freewheeling diode D1 is connected to the positive pole of the electrolytic capacitor C1, the discharge circuit is a discharge diode D2 connected to the positive pole of the electrolytic capacitor C1, and the reverse end of the discha...

Embodiment 3

[0042] Embodiment three: see attached Figure 8 As shown, a low harmonic current power adjustment device is used to adjust the power of the vacuum cleaner motor, including a bridge rectifier circuit, a controllable electronic switch connected in series between the motor M and the output end of the bridge rectifier circuit, and the controllable electronic The control terminal of the switch is connected to a square wave signal generating circuit, and a freewheeling circuit is connected in series between the output terminal of the bridge rectifier circuit and the motor, and the freewheeling circuit is mainly composed of a freewheeling diode D1 and an electrolytic capacitor C1 connected in series, A discharge circuit is connected to the capacitor C1, the reverse end of the freewheeling diode D1 is connected to the positive pole of the electrolytic capacitor C1, the discharge circuit is a discharge diode D2 connected to the positive pole of the electrolytic capacitor C1, and the rev...

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PUM

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Abstract

The invention discloses a low-harmonic current power regulating method, making full wave rectification on the power supply, using a square wave signal to control the on / off of an electronic switch; the on position of the electronic switch is before the zero passage point of an one-way pulsating voltage, the off position of the electronic switch is used to regulate the power of the circuit, a current sustaining circuit is provided at the off point of a control circuit, the current sustaining circuit contains storage component to the falling edge of the current of the power supply become smooth. The invention also discloses a device adopting the method. In the course of regulating the power of an electrical appliance, it makes the harmonic component of the current that the electric appliance absorbs from the power supply be small in each half-wave, really avoiding the production of the harmonic current in the circuit; besides, the circuit structure is simple and energy-saving, and the current waveform is so smooth as to have no bad effect on the electric network.

Description

technical field [0001] The invention relates to a power adjustment method and a power adjustment device adopting the method, in particular to a power adjustment method and a device thereof which meet the requirement of electromagnetic compatibility with low harmonic current. Background technique [0002] Adjusting the power of electrical appliances is not only a requirement to realize the use function of electrical appliances, but also can play a role in saving electricity. Frequency converters using pulse width modulation technology are used in high-power motor speed regulation and high-power power supply devices, and are welcomed by people. However, due to cost considerations, triac technology is generally used for power adjustment on relatively cheap household vacuum cleaners, electric tools and high-power electric heating appliances. Such household vacuum cleaners and power tools usually use series motors with figure 1 It is a simple thyristor power adjustment circuit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/66H02J3/00H02M1/12H02M1/42H02M3/155
CPCH02M2003/1555Y02B70/126H02M3/155H02M1/4225Y02B70/10H02M3/1555
Inventor 谢明毅
Owner 金丰电子(苏州)有限公司