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AC/DC power supply circuit compatible with thyristor dimming and its control method and power supply method

A technology of DC power supply and silicon dimming, applied in the direction of electric light circuit layout, light source, electric light source, etc., can solve problems such as poor performance, achieve high conversion efficiency, low power device loss, and good anti-lightning surge effect.

Active Publication Date: 2019-02-05
上海至弘电气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing linear power supply schemes often have poor performance in order to realize thyristor dimming

Method used

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  • AC/DC power supply circuit compatible with thyristor dimming and its control method and power supply method
  • AC/DC power supply circuit compatible with thyristor dimming and its control method and power supply method
  • AC/DC power supply circuit compatible with thyristor dimming and its control method and power supply method

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Experimental program
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Effect test

Embodiment

[0047] An AC / DC power supply circuit compatible with thyristor dimming, such as figure 1 ,include:

[0048] an AC power supply, providing AC power;

[0049] A silicon controlled rectifier dimming circuit, which realizes the adjustment of its output voltage by changing the size of the conduction angle;

[0050] A rectifier circuit, which converts the AC power provided by the AC power supply into DC power;

[0051] A current limiting-constant current circuit, which controls the switching device, thereby controlling the amplitude of the charging or discharging current or the discharging time of the intermediate energy storage circuit, so as to realize current limiting or output constant current;

[0052] A load circuit, connected in series between the rectifier circuit and the current limiting-constant current circuit, converts the electric energy provided by the AC power supply and the current limiting-constant current circuit into output energy;

[0053] A dimming signal gen...

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PUM

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Abstract

The invention provides a silicon controlled rectifier light modulation-supported AC / DC power supply circuit and a control method and a power supply method thereof. A light modulation signal generation circuit detects the DC voltage output from a rectifier circuit to generate a light modulation signal to provide a current reference signal. A current detection circuit detects a controlled current and provides a current feedback signal. A controller generates a control signal for a switch device in a current limiting-constant current circuit according to the difference between the current reference signal and the current feedback signal, so that the controlled current is enabled to change correspondingly with change in the DC voltage output from the rectifier circuit, thereby achieving silicon controlled rectifier light modulation. The power device loss is extremely low, the conversion efficiency is extremely high, and the power application range of the drive power supply can be easily expanded. The conduction angle of the rectifier bridge is increased, so that the power factor of the power supply circuit is enabled to be higher than the traditional rectifier circuit. The output voltage and the current ripple are small. The better anti-lightning stroke surge capability is achieved. The better silicon controlled rectifier light modulation compatibility is achieved. The integration is easy to implement.

Description

technical field [0001] The invention relates to an AC / DC power supply circuit compatible with thyristor dimming, a control method and a power supply method thereof. Background technique [0002] In recent years, high-brightness LED lighting has been widely used due to its advantages of high light efficiency, long life, high reliability and no pollution. LEDs cannot be directly connected to AC power, and need to be configured with a corresponding current-limiting drive power supply. The current LED drive solution is mainly a traditional high-frequency switching power supply. The circuit is complex and the cost is high, making many manufacturers switch to linear power supply solutions. [0003] The disadvantages of the traditional linear power supply circuit are: a. When the mains voltage is high, the power consumption of the current-limiting power device is very large, and the temperature rise of the current-limiting power device is high, which limits the application power ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M1/42H05B37/02
CPCH05B47/10Y02B70/10
Inventor 朱成花崔俊国
Owner 上海至弘电气科技有限公司
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