LED array interface circuit with energy storage link

A technology of LED array and interface circuit, which is applied in the field of DC-DC conversion interface circuit, can solve the problems of increasing input current ripple and achieve the effect of simple circuit structure

Inactive Publication Date: 2018-12-21
浙江中亚光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the energy-feedback LED array interface circuit feeds excess power back to the input terminal, and the input current ripple will increase during power feedback

Method used

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  • LED array interface circuit with energy storage link
  • LED array interface circuit with energy storage link
  • LED array interface circuit with energy storage link

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] refer to figure 2 , image 3 and Figure 5 , the LED array interface circuit including the energy storage link includes channel circuit 1 to channel circuit n and a group of control buses. The channel circuit j includes an energy storage link j, a diode Dcj, an N-type MOS transistor Mcj, an inductor Lcj and a capacitor Coj, and the value of j ranges from 1 to n. The energy storage link j has a port aj, a port bj, a port cj and a port dj, the port aj is connected to the positive terminal of the DC power supply Vi, the port bj is connected to the anode of the diode Dcj, and the port cj is connected to the drain of the N-type MOS transistor Mcj, Port dj is connected to the negative terminal of DC power Vi. The cathode of the diode Dcj is simultaneously connected to the source of the N-type MOS transistor Mcj and one end of the inductor Lcj, the other end of the inductor Lcj is simultaneously connected to one end of the capacitor Coj and the anode of the LED string j, a...

Embodiment 2

[0027] refer to figure 2 , Figure 4 and Figure 6 , the energy storage link j in the LED array interface circuit including the energy storage link includes an inductor Lbj, a capacitor Cbj and a diode Dbj, one end of the capacitor Cbj is connected to the port aj and port cj of the energy storage link j at the same time, and the other end of the capacitor Cbj is simultaneously One end of the inductor Lbj is connected to the port bj of the energy storage link j, the other end of the inductor Lbj is connected to the cathode of the diode Dbj, and the anode of the diode Dbj is connected to the port dj of the energy storage link j.

[0028] Other circuit structures of the second embodiment are the same as those of the first embodiment.

[0029] When channel circuit j is in continuous conduction mode, its steady-state working process includes the following two stages.

[0030] Stage 1: N-type MOS transistor Mcj is cut off, diode Dcj is turned on, diode Dbj is turned on, DC power...

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Abstract

The invention provides an LED array interface circuit including an energy storage link, which comprises a channel circuit 1 to a channel circuit n and a group of control buses. The channel circuit j includes an energy storage link j, a diode Dcj, an N-type MOS transistor Mcj, an inductor Lcj, and a capacitor Coj. The energy storage link j has a port aj, a port bj, a port cj, and a port dj, and thevalue range of j is from 1 to n. When the N-type MOS transistor Mcj is turned off, the diode Dcj is turned on, and the DC power supply Vi supplies power to the energy storage link j and the LED string j at the same time. When the N-type MOS transistor Mcj is turned on, the diode Dcj is turned off, and the DC power supply Vi and the energy storage link j together supply power to the LED string j.The invention solves the inconsistency problem of each LED string in the LED array by utilizing the energy storage and energy release function of the energy storage link, and can realize high-efficiency LED array driving and small input current ripple.

Description

technical field [0001] The invention relates to a direct current-direct current (DC-DC) conversion interface circuit with single input and multiple outputs, which can be applied to regular or irregular LED array drive systems, in particular to an energy storage type LED array interface circuit. Background technique [0002] Such as figure 1 As shown, the energy-feedback LED array interface circuit proposed by the invention patent ZL201310382254.X can improve the drive efficiency of any LED array (regular or irregular), using the values ​​of Dj, Caj, Maj, Daj, Laj and Lbj(j The energy-feeding branches ranging from 1 to n) can solve the inconsistency problem of each branch in the LED array, and improve the efficiency by collecting excess energy and feeding it back to the input end. Although the energy-feedback LED array interface circuit can achieve high efficiency, the applicable control method is relatively complicated. The channel circuit j connected to each LED string co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/395H05B45/00
Inventor 陈怡金雪强宋振伟董发群
Owner 浙江中亚光电科技有限公司
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