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Led (light emitting diode) drive circuit with voltage regulation function and control method

A technology of driving circuit and voltage regulating circuit, applied in the field of LED driving circuit and control with voltage regulating function, can solve problems such as lowering efficiency

Pending Publication Date: 2019-04-12
SICHUAN LEDFRIEND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the present invention provides an LED drive circuit and control method with a voltage regulation function, which can effectively solve the problem of reduced efficiency

Method used

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  • Led (light emitting diode) drive circuit with voltage regulation function and control method
  • Led (light emitting diode) drive circuit with voltage regulation function and control method
  • Led (light emitting diode) drive circuit with voltage regulation function and control method

Examples

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Effect test

Embodiment 1

[0061] see figure 1 , figure 1 It is a schematic block diagram of an LED drive circuit with a voltage regulation function (hereinafter referred to as "led drive circuit") provided by Embodiment 1 of the present invention. The led driving circuit 100 includes a control circuit 110 and a voltage regulation circuit 120 . Further, the voltage regulation circuit 120 includes a filter circuit 121 , a detection circuit 122 and a boost circuit 123 .

[0062] The voltage regulating circuit 120 is electrically connected with the control circuit 110. For example, the control circuit 110 can be a central processing unit (CPU, center processor unit), including a plurality of pins, each pin is used to send and receive signals, and control the led driving circuit 100 to send Output signal to control its dimming function. In other words, the control circuit 110 is used to control the sub-circuits of the voltage regulating circuit 120 . The sub-circuits of the voltage regulation circuit 12...

Embodiment 2

[0068] see figure 2 , figure 2 is a partial circuit diagram of the detection circuit provided by Embodiment 2 of the present invention. The detection circuit 122 includes an RC filter circuit RC, a Zener diode Z, a diode D and a resistor R. The RC filter circuit RC includes a first terminal and a second terminal, and the second terminal of the RC filter circuit RC is grounded. Zener diode Z includes a first end, a second end and a third end. The first end of the Zener diode Z is connected to the first end of the RC filter circuit RC. The second end of the Zener diode Z is grounded. The Zener diode Z has a clamping function to provide a fixed voltage drop, increasing the accuracy of controlling the output voltage. The diode D includes a first end and a second end. The first end of the diode D is connected to the third end of the Zener diode Z. The resistor R includes a first terminal and a second terminal. The first end of the resistor R is connected to the second end...

Embodiment 3

[0072] see image 3 , image 3 It is a partial circuit diagram of the boost circuit provided by Embodiment 3 of the present invention. The boost circuit 123 includes an inductor L and a voltage dividing circuit FC.

[0073] The inductor L is electrically connected with the control circuit. The inductor L receives the boost signal sent by the control circuit to boost the input voltage. The voltage dividing circuit FC is electrically connected with the control circuit and the inductor L. The voltage dividing circuit FC is connected to the equal voltage point EV. The control circuit controls the boost circuit to step up the voltage according to the voltage level of the equal voltage point EV. The equal-voltage point EV of the boost circuit 123 is the same as the equal-voltage point EV of the detection circuit 122 in Embodiment 2, so the control circuit can control the boost circuit to step-up the voltage according to the equal-voltage point EV generated by the input voltage....

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PUM

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Abstract

The invention provides an led (light emitting diode) drive circuit with a voltage regulation function and a control method. The led drive circuit comprises a control circuit and a voltage regulation circuit, wherein the voltage regulation circuit includes a filtering circuit, a detection circuit and a boosting circuit; the voltage regulation circuit is electrically connected with the control circuit; the detection circuit is electrically connected with the filtering circuit; the boosting circuit is electrically connected with the filtering circuit and the detection circuit; the control circuitis used for controlling a sub-circuit of the voltage regulation circuit; the detection circuit is used for detecting the voltage level of an input voltage; and the control circuit controls the boosting circuit to perform stepwise boosting according to the voltage level of the input voltage detected by the detection circuit. With the led drive circuit provided by the invention, the stepwise boosting can be performed according to the voltage level of the detected input voltage; the voltage regulation function is completed through the stepwise boosting and the power conversion efficiency is improved.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an LED driving circuit with a voltage regulating function and a control method. Background technique [0002] With the high-power LED drive power supply, due to the regulations on harmonics, it is generally necessary to add a PFC circuit in the front stage. In the non-isolated LED drive power supply with Boost PFC in the front stage and Buck step-down in the rear stage, according to the traditional method, the input AC voltage is firstly rectified and boosted to a DC voltage of about 400V, and then stepped down by the Buck in the latter stage. Voltage drops the voltage to a lower DC load voltage. In this way, due to the large boost ratio of the pre-stage PFC circuit when the network input is low, the conversion efficiency decreases. The Buck step-down circuit in the subsequent stage will also reduce the conversion efficiency due to the large step-down ratio. Efficiency reduc...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 肖洪周孝亮朱俊高钟春林黄斌黄和明范勇叶界明李少科陈学文
Owner SICHUAN LEDFRIEND TECH