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A damping circuit and an LED driving circuit with the damping circuit

A damping circuit and circuit technology, used in electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of LED driver design difficulties, and achieve the effect of reducing the withstand voltage level, avoiding damage or inability to work

Active Publication Date: 2019-01-08
JOULWATT TECH INC LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a damping circuit and an LED comprising a damping circuit in order to solve the problem that the high voltage output by the electronic ballast during the start-up stage brings difficulties to the design of the LED driver of the subsequent stage when the electronic ballast is used as power supply for the LED lamp. Drive circuit

Method used

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  • A damping circuit and an LED driving circuit with the damping circuit
  • A damping circuit and an LED driving circuit with the damping circuit
  • A damping circuit and an LED driving circuit with the damping circuit

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Embodiment Construction

[0026] figure 1 Shown is the existing LED drive circuit, in this circuit, the AC high-frequency signal output by the electronic ballast is directly output to the LED driver after being rectified. However, since electronic ballasts are specially designed for fluorescent lamps, fluorescent lamps need to perform glow discharge during the lighting stage, and glow discharge requires a very high voltage. Therefore, the output of the electronic ballast includes two stages, one of which is the start-up stage, in which the electronic ballast outputs high voltage to make the fluorescent lamp glow, and when the fluorescent lamp is lit, the electronic ballast enters the steady-state stage, Output a normal working voltage of about 200V.

[0027] exist figure 1 In the process, the electronic ballast is directly connected to the LED driver. During the start-up phase of the electronic ballast, since the LED load is not connected, the load has no output current. At this time, the output of t...

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Abstract

The invention provides a damping circuit and an LED driving circuit with the damping circuit. A damping circuit includes a damping element, a control circuit, and a control switch. The damping elementis electrically connected to the DC bus bar. The control circuit obtains a supply voltage from the DC bus and compares the supply voltage with a threshold voltage. When the DC bus voltage is higher than the threshold voltage, the control circuit outputs a first control signal. The control switch is electrically connected to the damping element and the control circuit respectively, and the controlswitch cuts the damping element into the circuit based on the first control signal output from the control circuit. By setting a damping circuit in the LED drive circuit, the voltage on the DC bus bar can be effectively restrained from rising in the start-up phase, and the withstand voltage level of the latter stage circuit can be effectively reduced, so that the LED drive is compatible with theelectronic ballast.

Description

[0001] This application is a divisional application with application number 201510220932.1, application date April 30, 2015, and invention name "damping circuit and LED drive circuit with damping circuit". technical field [0002] The invention relates to the field of LED driving, and in particular to a damping circuit and an LED driving circuit with the damping circuit. Background technique [0003] The traditional electronic ballast is connected to the load of the fluorescent lamp, because the luminous efficiency of the fluorescent lamp is relatively low, there is a certain degree of environmental pollution. In today's energy saving and emission reduction, replacing fluorescent lamps with LED lamps has become a trend. In order to achieve direct replacement, LED lamps not only need to be able to accept ordinary mains electricity for their power supply, but also need to be able to be directly connected, that is, the electronic ballast of fluorescent lamps as their power supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
Inventor 张军明季悦黄必亮任远程周逊伟
Owner JOULWATT TECH INC LTD
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