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Discharge circuit, discharge current control method and led control circuit

A bleeder current and bleeder circuit technology are applied in the field of bleeder circuits, bleeder current control methods and LED control circuits, which can solve problems such as adverse effects on system reliability, low efficiency, and increased costs, so as to improve system efficiency and System reliability, power consumption reduction, power consumption reduction effect

Active Publication Date: 2019-03-08
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to ensure that the input current is not less than VREF0 / R02, this solution has disadvantages such as low efficiency and temperature rise, which will adversely affect the reliability of the system and increase the cost.

Method used

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  • Discharge circuit, discharge current control method and led control circuit
  • Discharge circuit, discharge current control method and led control circuit
  • Discharge circuit, discharge current control method and led control circuit

Examples

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Embodiment Construction

[0031] 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 schemes made within the spirit and scope of the present invention.

[0032] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0033] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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PUM

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Abstract

The invention discloses a discharge circuit, a discharge current control method and an LED control circuit. The scheme of the invention can be applied to a linear drive scheme. The threshold voltage is a zero-crossing value. When the input voltage crosses zero, the The load current is zero, so a discharge current is generated to make the input current greater than the holding current of the thyristor dimmer, which is used to maintain the conduction of the thyristor dimmer, and the second time is set as the delay time, which reduces the power consumption, the invention reduces the discharge current and improves the system efficiency and system reliability under the premise of ensuring the dimming effect.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a discharge circuit, a discharge current control method and an LED control circuit. Background technique [0002] Because LED lamps are more energy-saving and environmentally friendly than traditional fluorescent lamps and incandescent lamps, LED lamps are slowly replacing existing fluorescent lamps and incandescent lamps. In incandescent lamps with thyristor dimmers, it is also desirable to use LED lamps to replace them, so LEDs must be compatible with thyristor dimmers. However, in the application of LED lamps to replace incandescent lamps, due to the large voltage change rate (dv / dt) at the output terminal voltage when the thyristor is turned on, it will cause a large wave at the input terminal. inrush current. This surge current has a large oscillation amplitude and short duration, which can easily cause the thyristor to be turned off by mistake, affect the stable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/37Y02B20/30
Inventor 刘国强白浪张军明黄必亮任远程周逊伟
Owner JOULWATT TECH INC LTD
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