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Self-adaptive linear dimming power supply system

A linear dimming and power supply system technology, applied in the direction of electrical components, energy-saving control technology, etc., can solve problems such as limiting system design flexibility, high driving potential, and raising costs, achieving improved flexibility, wide application occasions, and dynamic response Good results

Pending Publication Date: 2021-12-07
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a topology in which the two ends of the power switch tube Q1 are not directly grounded is used as the front-end topology, the driving potential of the gate of Q1 is relatively high, which requires the entire control chip to be capable of withstanding and outputting high voltage, which poses a challenge to the withstand voltage of the control chip. Higher requirements raise costs
Such habits limit the flexibility of system design

Method used

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  • Self-adaptive linear dimming power supply system
  • Self-adaptive linear dimming power supply system
  • Self-adaptive linear dimming power supply system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] figure 2 It is a schematic circuit diagram of the adaptive linear dimming power line system of this embodiment.

[0050] Please refer to figure 2 , this embodiment provides an adaptive linear dimming power supply system based on a buck circuit (step-down circuit), the system includes an adaptive voltage output module 1 , an LED linear dimming module 2 and a multiplexer 3 .

[0051]Wherein, the LED linear dimming module 2 has n LED linear dimming branches 21-2n connected in parallel, where n is a natural number not less than 2. Each LED linear dimming branch includes a low-pass filter, an error amplifier, a dimming switch tube, a sampling resistor and an LED load, and the positive end of the LED load is connected to the output of the adaptive voltage output module 1 terminal to connect to the DC output voltage Vo output by the adaptive voltage output module 1, and the negative terminal of the LED load is connected to the drain terminal of the dimming switch tube to f...

Embodiment 2

[0068] Please refer to Figure 7 , this embodiment provides an adaptive linear dimming power supply system based on a flyback circuit, including an adaptive voltage output module 1 , an LED linear dimming module 2 and a multiplexer 3 . The structures of the LED linear dimming module 2 and the multiplexer 3 and their connection relationship with the adaptive voltage output module 1 are the same as those in the first embodiment, and will not be repeated here.

[0069] The adaptive voltage output module 1 of this embodiment has a flyback circuit structure, and its circuit composition and internal connection relationship are different from those of the first embodiment. Specifically, the adaptive voltage output module 1 of this embodiment includes a rectifier bridge 11, an input filter capacitor C1, a first controller 12, a second controller 13, a transformer T1, an optocoupler transmitter 14, an optocoupler receiver 15, Freewheeling diode D5 and output filter capacitor C2. Wher...

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Abstract

The invention provides a self-adaptive linear dimming power supply system which comprises a self-adaptive voltage output module and an LED linear dimming module with at least one LED linear dimming branch. The self-adaptive voltage output module is of a double-controller structure, and a first controller and a second controller of the self-adaptive voltage output module are located on different integrated circuit main cores respectively. The second controller can receive a sampling signal generated by the common end of an LED load and a dimming switch tube in the LED linear dimming branch, and transmits a corresponding adjustment control signal to the first controller, so that on one hand, the problems that the direct-current output voltage cannot be fed back in real time and the dynamic response performance of the system is worse due to the fact that the potential of the grounding end of the first controller is higher than the system ground, can be avoided, and on the other hand, a chip where the first controller is located and a chip where the second controller is located only need a very small voltage-withstanding area, but do not need to bear the over-high withstand voltages, the cost of a control chip is reduced, and the flexibility of the system design is improved.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to an adaptive linear dimming power supply system. Background technique [0002] With the continuous progress of society, LEDs are widely used in our daily life, such as backlights of electronic products, and daily lighting in homes and public places. The reason why LEDs are widely used by humans is because of their advantages such as small size, low power consumption, long service life, high brightness, low heat, environmental protection, durability, and gorgeous colors. [0003] figure 1 It is a more commonly used multi-line linear dimming power supply system on the market. The voltage on the AC side of the power grid is rectified by a rectifier bridge composed of diodes D1, D2, D3, and D4, and then output as an output voltage Vo after being controlled by the controller in the control chip and the power switch tube Q1, and Vo is a fixed value. The output volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/34H05B45/10H05B45/30H05B45/325
CPCH05B45/34H05B45/325H05B45/30H05B45/10Y02B20/40
Inventor 郭艳梅胡黎强孙顺根郜小茹朱臻
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD