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LED traffic signal lamp and drive circuit thereof

A technology of traffic signal lights and drive circuits, which is applied in the control of traffic signals, light circuit layout, traffic control systems, etc., can solve the problems of start-up and shutdown lag, long start-up delay time, etc., and solve the problem of long start-up delay time Effect

Inactive Publication Date: 2014-12-10
CHINA GREATWALL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a driving circuit for LED traffic lights, aiming to solve the problems that the existing driving circuits of LED traffic lights have serious delays in starting and shutting down and long delays in starting up

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  • LED traffic signal lamp and drive circuit thereof
  • LED traffic signal lamp and drive circuit thereof

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Embodiment Construction

[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0016] figure 1 The module structure of the LED traffic signal light driving circuit provided by the embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0017] The LED traffic signal lamp driving circuit is connected with the AC power supply 200, the LED load 900 and the reference power supply 1000, including an EMI filter circuit 300, an input rectification filter circuit 400, a PWM control circuit 500, a DC-DC transformer circuit 600, and an output rectifica...

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Abstract

The invention belongs to the field of LED drive and provides an LED traffic signal lamp and a drive circuit thereof. The drive circuit of the LED traffic signal lamp comprises a starting circuit which comprises a starting voltage generation unit, a switch unit, a voltage comparison unit and a high-frequency filter unit, so that an LED load is provided with working voltage rapidly, the starting voltage generation unit is turned off rapidly after the working voltage is set, time delay of starting and turning off are effectively decreased, and the problem that an existing drive circuit of an LED traffic signal lamp is seriously time-delayed in starting and turning off and long in turn on delay is solved.

Description

technical field [0001] The invention belongs to the field of LED driving, in particular to an LED traffic signal lamp and a driving circuit thereof. Background technique [0002] In road traffic, traffic lights, as an auxiliary tool for traffic management, regulate the order of urban road traffic, help reduce the occurrence of traffic accidents, and improve the efficiency of road use. In recent years, due to the continuous expansion of the application range of LEDs, LEDs have gradually replaced incandescent lamps as the main light source and are used in traffic lights. [0003] At present, the driving circuit adopted by the existing LED traffic signal lamp is to use a MOS tube as a switching element to control the shutdown of its internal starting circuit. However, since the triode that controls the gate-source voltage of the MOS transistor is supplied with the collector voltage by an energy storage capacitor, when the input AC voltage is turned off and then turned on immed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08G1/07G08G1/095H05B37/02
CPCY02B20/42Y02B20/40
Inventor 徐立军黄昌宾于吉永罗强
Owner CHINA GREATWALL TECH GRP CO LTD