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Power driving circuit of LED

A technology of power drive circuit and filter capacitor, applied in the field of dimming control of LED lamps, can solve problems such as inability to use normally and cannot be supported, and achieve the effects of low overall cost, reduced process requirements, and good compatibility

Inactive Publication Date: 2016-04-13
SHENZHEN SEASTAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The LED dimming driver cannot provide support for low-voltage high-current LED (3.3V300mA-700mA) series number changes of more than 50%-100%. For the number of LEDs, the existing technology will not be able to support, and the LED lights will flicker and fail to work normally. use

Method used

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  • Power driving circuit of LED
  • Power driving circuit of LED
  • Power driving circuit of LED

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Embodiment Construction

[0014] 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.

[0015] The embodiment of the present invention stabilizes the IC power supply voltage in the power drive circuit so that it is not affected by the change of the LED load, thereby ensuring that the power drive circuit can work normally; the compatibility of the power drive circuit with LED lights Better, the process requirements of LED are reduced, the overall cost of the lamp is lowered, and it has a good market prospect.

[0016] The specific realization of the present invention is described in detail below in conjunction with specific embodiment:

[0017] Such as figure 2 As shown, the LED pow...

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Abstract

The invention belongs to the technical field of LED lamp dimming control, and discloses a power driving circuit of an LED. The power driving circuit comprises a transformer auxiliary winding (T1), a rectifier diode (D1), a filter capacitor (C1), a power triode (Q1), a voltage-regulator tube (D2) and a biasing resistor (R2), wherein a collector electrode of the power triode (Q1) is connected to a cathode of the rectifier diode (D1); the biasing resistor (R2) is connected between the collector electrode and a base electrode of the power triode (Q1); an anode of the voltage-regulator tube (D2) is grounded, and a cathode of the voltage-regulator tube (D2) is connected with the base electrode of the power triode (Q1); and an emitting electrode of the power triode (Q1) serves as the power supply pin of a power supply IC. According to the power driving circuit, a power circuit is not influenced by the load change of the LED.

Description

technical field [0001] The invention belongs to the technical field of dimming control of LED lamps, and in particular relates to an LED power drive circuit. Background technique [0002] Since the existing IC power supply technology existed before the birth of LED lamps, most of the previous lamps belonged to constant voltage loads. The current of constant voltage loads is not fixed, but the voltage is fixed, so this kind of IC power supply circuit does not have Big problems arise. However, when LEDs appear, the characteristics of LEDs are not exactly the same as those of the previous constant-voltage loads, and LEDs are constant-current loads, which have high requirements for current stability and relatively large voltage changes. The disadvantages of the IC power supply circuit are fully manifested. The voltage changes greatly, which seriously affects the stability of the IC work, causing the entire power supply to burn out and be damaged. This kind of power supply circ...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/44
Inventor 胡祥荣薛桂香
Owner SHENZHEN SEASTAR TECH CO LTD
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