Light-emitting diode (LED) actuator preventing LED from flickering
A LED driver and start-up control technology, which is applied in lighting devices, light sources, electric light sources, etc., can solve problems such as flickering of LED modules, achieve the effect of preventing flickering and improving reliability
Inactive Publication Date: 2015-04-15
SHANXI ZHAOXIN ELECTRIC POWER EQUIP
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Problems solved by technology
[0007] The purpose of the present invention is to provide an LED driver that prevents LED flickering, which can solve the problem that LED modules flicker when the neon bulb indicator light switch device and the semiconductor switch device are in the off state.
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[0024] In the following, the present invention will be further described in conjunction with the drawings and specific embodiments.
[0025] Such as Figure 4 As shown, an application circuit for controlling the turning on and off of the LED module is formed by taking the LED driver for preventing LED flickering of this embodiment in series with the neon bulb indicator switch device as an example for description.
[0026] An LED driver for preventing LED flickering includes an energy clamping circuit, a rectification circuit, a filter circuit, a switch transformer circuit, a PWM chip, a VCC power supply circuit, a feedback circuit and a start control circuit.
[0027] The output terminal of the rectifier circuit is connected to the input terminal of the filter circuit, the output terminal of the filter circuit is connected to the first input terminal of the switch transformer circuit, the driving terminal of the PWM chip is connected to the second input terminal of the switch ...
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The invention relates to a light-emitting diode (LED) actuator preventing an LED from flickering. The LED actuator preventing the LED from flickering comprises a rectifying circuit, a filter circuit, a switch voltage transformation circuit, a pulse-width modulation (PWM) chip, a volt current condenser (VCC) power supply circuit and a feedback circuit. The LED actuator preventing the LED from flickering further comprises a starting control circuit which is used for enabling the voltage of the power supply input end of the PEM chip to be lower than the starting threshold voltage of the PWM chip when the output voltage of the filter circuit is lower than critical voltage, and the starting control circuit is also used for enabling the voltage of the power supply input end of the PWM chip to be higher than or equal to the starting threshold voltage of the PWM chip and enabling the voltage of the power supply input end of the PWM chip to be constant when the output voltage of the filter circuit is higher than or equal to the critical voltage. The starting control circuit is added between the output end of the filter circuit and the power supply input end of the PWM chip, and the flickering phenomenon of an LED module occurring when neon bulb indicator light switch components or semiconductor switch components are in a disconnecting state is effectively avoided.
Description
technical field [0001] The invention relates to an LED driver. Background technique [0002] With the popularization of LED lighting all over the world and the continuous development of science and technology, there are many kinds of LED supporting products, and the two switches of the application terminal of its market customers will affect the use of LED drivers. [0003] Such as figure 2 As shown, one is a neon bulb indicator light switch device, and the neon bulb lamp EN inside it is used as a luminous body to indicate the on and off status of the switch; as image 3 As shown, the other is a semiconductor switch, which mostly uses a thyristor SCR as an on-off device, and its internal indicator light LD is used to indicate the on-off state of the switch. [0004] Such as figure 1 As shown, the existing LED driver includes a rectifier circuit, a filter circuit, a switch transformer circuit, a PWM chip, a VCC power supply circuit and a feedback circuit, and the output e...
Claims
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IPC IPC(8): H05B37/02
Inventor 曾维建涂道平
Owner SHANXI ZHAOXIN ELECTRIC POWER EQUIP