Bleeder circuit and method for controlling bleeder current and LED control circuit

A technology of discharging current and discharging circuit, which is applied in the fields of discharging circuit, controlling method of discharging current and LED control circuit, can solve problems such as low efficiency, poor conduction stability of thyristor, large power consumption, etc., and achieve improvement Improve system efficiency, improve system reliability, and reduce the effect of leakage current

Active Publication Date: 2017-01-11
JOULWATT TECH ZHANGJIAGANG INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a discharge circuit, a discharge current control method and an L

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  • Bleeder circuit and method for controlling bleeder current and LED control circuit
  • Bleeder circuit and method for controlling bleeder current and LED control circuit
  • Bleeder circuit and method for controlling bleeder current and LED control circuit

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Embodiment Construction

[0040] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and solutions made within the spirit and scope of the present invention.

[0041] In order for the public to have a thorough understanding of the present invention, specific details are described in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0042] In the following paragraphs, the present invention is described in more detail by way of example with reference to the drawings. It should be noted that the drawings all adopt a relatively simplified form and all use imprecise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the emb...

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Abstract

The invention discloses a bleeder circuit and a method for controlling bleeder current and an LED control circuit. The scheme of the invention can be applied to the switch driving scheme. The threshold voltage is a zero passage value. When input voltage passes zero, bleeder current is generated, so that input current is more than the holding current of silicon controlled. Whether or not the bleeder current regulating circuit is enabled is controlled in accordance with the waveform characteristics of the front and rear half cycles of the sine wave and the input current of the driving circuit. According to the bleeder circuit, on the premise of ensuring the dimming effect, the bleeder circuit is reduced, and the efficiency and reliability of the system are improved. Meanwhile, the TRIAC maximum conduction angle is increased, and thereby easily meeting the requirement of the maximum output current.

Description

Technical field [0001] The invention relates to the technical field of power electronics, in particular to a bleeder circuit, a bleed current control method and an LED control circuit. Background technique [0002] Because LED lamps are more energy-efficient and environmentally friendly than traditional fluorescent lamps and incandescent lamps, LED lamps are slowly replacing the existing fluorescent lamps and incandescent lamps. In the incandescent lamp with thyristor dimmer, it is also hoped to use LED lamp to replace, so the LED needs to be compatible with the thyristor dimmer. However, in the application of LED lamps to replace incandescent lamps, when the thyristor is turned on, the output voltage will have a larger rate of voltage change (dv / dt), resulting in larger waves at the input. Surge current. This surge current has a large amplitude and short duration, which can easily cause the thyristor to turn off by mistake, affect the stable operation of the LED drive circuit,...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/37H05B45/3575
Inventor 刘国强白浪张军明黄必亮任远程周逊伟
Owner JOULWATT TECH ZHANGJIAGANG INC LTD
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