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Linear high power factor constant current flicker-free led drive circuit and method

An LED driving, high-power technology, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of low power factor, LED power frequency flicker, low efficiency, etc., so as to reduce the loss of system efficiency and realize adjustment. Effect of light output

Active Publication Date: 2020-06-19
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a linear high power factor constant current flicker-free LED drive circuit and method for solving the problem of low power factor and LED existence in linear LED drive in the prior art. Power frequency flicker, low efficiency and other issues

Method used

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  • Linear high power factor constant current flicker-free led drive circuit and method
  • Linear high power factor constant current flicker-free led drive circuit and method
  • Linear high power factor constant current flicker-free led drive circuit and method

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Embodiment 1

[0065] like Figure 4 As shown, this embodiment provides a linear high power factor constant current flicker-free LED drive circuit 4, the linear high power factor constant current flicker-free LED drive circuit 4 at least includes:

[0066] LED load, charging capacitor Co, charging control module 41 , adaptive ripple removal module 42 , working voltage generation module 43 .

[0067] like Figure 4 As shown, the LED load is connected to the output terminal of the voltage input module 3 .

[0068] Specifically, in this embodiment, the voltage input module 3 includes an AC power supply AC, a fuse F1, and a rectification unit, the rectification unit includes two sets of diode groups connected in parallel, and each diode group includes two diode groups connected in series , the AC power supply AC is connected between two diodes of each diode group through the fuse F1, the voltage input module 3 provides an input voltage Vin, and the input voltage Vin is a continuously increasin...

Embodiment 2

[0088] This embodiment provides a linear high power factor constant current flicker-free LED drive circuit, the circuit structure of this embodiment is basically the same as that of Embodiment 1, the difference lies in the input end of the compensation voltage generation unit 421 described in this embodiment The drain end of the second power switch tube Q2 is connected, and a discharge module is added in this embodiment.

[0089] like Figure 5 As shown, in this embodiment, the input end of the compensation voltage generating unit 421 is connected to the drain end of the second power switch transistor Q2, and is used to generate the The compensation voltage described above is the same as the principle of the first embodiment.

[0090] like Figure 5 As shown, the discharge module 44 is connected between the output terminal of the voltage input module 3 and the ground, and is used to limit the minimum value of the output current of the LED load and prevent the current from be...

Embodiment 3

[0093] This embodiment provides a linear high power factor constant current flicker-free LED driving method, which is a method embodiment corresponding to the linear high power factor constant current flicker-free LED driving circuit in the first and second embodiments. The linear high power factor constant current flicker-free LED driving method at least includes:

[0094] When the input voltage Vin is less than the voltage VCo on the charging capacitor Co, the charging capacitor Co discharges to the LED load, and the adaptive ripple removal module 42 controls the output current of the LED load to be constant. stream output.

[0095] Specifically, when the input voltage Vin is lower than the voltage VCo on the charging capacitor Co, the charging capacitor Co, the LED load, the adaptive ripple removal module 42 and the charging control module 41 form a loop , the charging capacitor Co supplies power to the LED load, and the adaptive ripple removal module 42 adjusts the second...

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Abstract

The present invention provides a linear high power factor constant current non-stroboscopic LED drive circuit and method, including an LED load; a charging capacitor that discharges a constant current to the LED load when the input voltage is lower than the voltage on the charging capacitor; and controls the charging and discharging of the charging capacitor A charging control module that maintains a balanced load, and an adaptive ripple removal module that maintains a constant output current of the LED load. When the input voltage is lower than the voltage on the charging capacitor, the charging capacitor discharges to the LED load, and the adaptive ripple removal module controls the output current of the LED load to be constant; when the input voltage is greater than the voltage on the charging capacitor, the input voltage charges the charging capacitor, and at the same time To supply power to the LED load, the adaptive de-ripple module controls the output current of the LED load to be constant. The present invention has high power factor; output current has no flicker; high efficiency; the output current can remain constant when the input voltage changes; There are no flickering advantages in silicon dimming applications.

Description

technical field [0001] The invention relates to the field of LED constant current control, in particular to a linear high power factor constant current non-flicker LED drive circuit and method. Background technique [0002] LED is a semiconductor electronic component that can emit light. This electronic component can only emit red light with low luminosity in the early days. With the continuous advancement of technology, it has now developed to the extent that it can emit visible light, infrared rays and ultraviolet rays. Big improvement. LED has the advantages of high efficiency, long life, unbreakable, high switching speed, high reliability, etc. that traditional light sources cannot match, and has been widely used in the fields of indicator lights, displays and lighting. [0003] Usually, in the linear LED drive circuit, in order to eliminate the flicker of the LED, a large electrolytic capacitor is added after the rectifier bridge to filter to achieve no flicker of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/10H05B45/30H05B44/00
CPCH05B45/00
Inventor 刘军吴泉清吴传奎王兆坤
Owner CRM ICBG (WUXI) CO LTD