Constant power LED driver

A technology of LED driver and constant power, applied in the field of LED linear constant current driver, can solve the problems of LED efficiency decrease, input power increase, driver efficiency decrease, etc., and achieve the effect of good LED drive efficiency

Pending Publication Date: 2019-01-25
厦门芯达茂微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this circuit has an obvious disadvantage
That is to say, although the current of the LED string 12 does not change with the change of the input voltage, when the input voltage rises, such as from 220V to 240V, the input power will increase accordingly, while the power consumption of the LEDs remains constant. The efficiency of the entire drive will drop sharply if the situation changes
[0005] In order to solve the problem that LED efficiency decreases when the input voltage rises, there is known a constant power LED driver that can reduce the LED current when the input voltage rises to keep the input power constant.
However, the general constant power LED drivers on the market generally have the disadvantage of complex circuit structure

Method used

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Embodiment Construction

[0034] In order to further understand the structure, features and purpose of the present invention, it will be described in detail in conjunction with the accompanying drawings and preferred specific embodiments.

[0035] Please refer to figure 2 , which shows a circuit diagram of an embodiment of the constant power LED driver of the present invention. As shown in Figure 2, an LED lighting device includes a rectifier module 100, a filter capacitor 110, an LED string 120, a filter capacitor 130 and a constant power LED driver 140, and the constant power LED driver 140 includes a voltage-to-current module 150 And an adjustable constant current module 160 .

[0036] exist figure 2 In the circuit, the constant power LED driver 140 has a voltage input terminal IN to couple with the cathode of the LED string 120, the anode of the LED string 120 is used to couple with a DC voltage VIN, the rectifier module 100 and the filter capacitor 110 In parallel, the LED string 120 is conne...

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Abstract

The invention provides a fixed-power LED driver, which comprises a voltage-to-current module for generating a control current according to a voltage division of an input voltage, wherein, when the voltage division rises, the control current rises, and when the voltage division drops, the control current drops; and when the voltage division drops, the control current drops. And an adjustable constant current module for determining an upper limit of an output current according to a reference voltage and adjusting the level of the output current according to the control current, wherein the adjustable constant current module causes the output current to decrease when the control current rises and causes the output current to increase when the control current falls.

Description

technical field [0001] The invention relates to an LED linear constant current driver, in particular to a constant power LED driver which can make the input power not vary with the input voltage. Background technique [0002] Please refer to figure 1 , which shows a circuit diagram of a conventional LED linear constant current driver. like figure 1 As shown, the LED linear constant current driver includes a rectifier module 10, a filter capacitor 11, an LED string 12, a filter capacitor 13, an amplifier 14, an NMOS transistor 15 and a current sensing resistor 16, wherein the amplifier 14, The NMOS transistor 15 and the current sensing resistor 16 are used to form a constant current module. [0003] During operation, an input AC voltage AC will be converted into a DC voltage to supply power to the LED string 12 through the rectification module 10 and the filter capacitor 11, and the constant current module will pass through the amplifier 14, the NMOS transistor 15 and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/50
Inventor 王志清刘鹏志
Owner 厦门芯达茂微电子有限公司
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