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LED driving circuit

A LED drive and circuit technology, applied in electrical components, static indicators, instruments, etc., can solve problems such as consumption efficiency and low system efficiency

Active Publication Date: 2021-08-31
NANJING ZGMICRO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then by adjusting the voltage drop of the NMOS or bipolar transistor connected in series on each LED branch (that is, the NMOS or bipolar transistor is in a semi-conducting state), the excess voltage drop to maintain the LED set current is adjusted through the NMOS or bipolar transistor. , the disadvantage of this approach is that these NMOS or bipolar transistors will consume additional efficiency, resulting in low system efficiency

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Embodiment Construction

[0019] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0021] The present invention provides an LED driving circuit for connecting and driving several strings of LEDs.

[0022] Please refer to figure 1 As shown, it is a schem...

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Abstract

The invention provides an LED driving circuit. The LED driving circuit comprises: an inductor connected between a power supply end and a node A; an energy storage switch connected between the node A and a ground node; N voltage output ends respectively connected with the N series channels in a one-to-one correspondence manner; N power supply switches, wherein one connecting end of each power supply switch is connected with the node A, and the other connecting end of each power supply switch is connected with the corresponding voltage output end; N feedback resistors respectively used for obtaining feedback voltages of the series channels; and a multi-input feedback controller, wherein the input end of the multi-input feedback controller is connected with the feedback resistors in the N series channels, the output end of the multi-input feedback controller is connected with the control end of the energy storage switch and the control ends of the N power supply switches, and the multi-input feedback controller controls the energy storage switch and the N power supply switches to be intermittently switched on based on the feedback voltage of each series channel, so as to carry out power supply control on the N series channels in sequence. The brightness of each LED can be consistent, the extra energy consumption can be reduced, and the system efficiency is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of LED control, in particular to an LED driving circuit. 【Background technique】 [0002] Light-emitting diodes (LEDs for short) are widely used in various products, for example, they are used as backlights in various computer liquid crystal displays, large-screen LED advertising screens, and the like. [0003] Since there are differences among LEDs during manufacture, the conduction voltage of each LED is different, so to realize that the current of each LED branch is equal, each LED needs to be adjusted. In the prior art, the output voltage VO is adjusted to be higher than the minimum required working voltage. Then by adjusting the voltage drop of the NMOS or bipolar transistor connected in series on each LED branch (that is, the NMOS or bipolar transistor is in a semi-conducting state), the excess voltage drop to maintain the LED set current is adjusted through the NMOS or bipolar transistor. , the dis...

Claims

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Application Information

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IPC IPC(8): H05B45/10
CPCH05B45/10G09G2330/021
Inventor 王钊
Owner NANJING ZGMICRO CO LTD