High-reliability LED power supply dimming turn-off circuit

A technology of LED power supply and shutdown circuit, which is applied in the direction of electrical components, etc., can solve problems such as inability to turn off, VCC instability, complex circuits, etc., to achieve the effect of ensuring stability, avoiding uncertainty, and increasing circuit reliability

Pending Publication Date: 2021-10-12
迈思普电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages: complex wiring and high cost
[0008] Disadvantages: VCC is unstable after dimming is turned off, and there will be problems of dimming flickering or failure to turn off due to VCC power failure during mass pr

Method used

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  • High-reliability LED power supply dimming turn-off circuit

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Example Embodiment

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] With reference to the accompanying drawings, a high-reliability LED power supply dimming shutdown circuit includes an operational amplifier U300 and peripheral circuits. Signals on the operational amplifier U300 are connected to a main control circuit and an auxiliary control circuit. The main control circuit includes a field Effect transistor Q111, effect transistor Q112, effect transistor Q113, resistor R329, resistor R330, resistor R331, resistor R340, diode D306 and diode D307, the gate of the field effect transistor Q113 is connected to the power supply VCC through R330, the field effect The gate of the transistor Q113 is grounded through a resistor R331, the drain of the field effect transistor Q112 is connected to the power supply VCC through R330, the source of the field effect transistor Q112 is grounded, and the source of the field effect tran...

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PUM

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Abstract

The invention discloses a high-reliability LED power supply dimming turn-off circuit which comprises an operational amplifier U300 and a peripheral circuit. The operational amplifier U300 is in signal connection with a main control circuit and an auxiliary control circuit, the main control circuit comprises a field effect transistor Q111, an effect transistor Q112, an effect transistor Q113, a resistor R329, a resistor R330, a resistor R331, a resistor R340, a diode D306 and a diode D307, and the auxiliary control circuit comprises a dimming signal Vdim_off, a resistor R100, a resistor R102, a resistor R104, a diode D103, a diode D322, an optical coupler PC1A, an optical coupler PC1B, a triode Q101 and a capacitor C100. The high-reliability LED power supply dimming turn-off circuit of the invention has the advantages of simple circuit, high reliability and low cost.

Description

technical field [0001] The invention relates to the technical field of dimming and shutdown circuits, in particular to a high-reliability LED power supply dimming and shutdown circuit. Background technique [0002] There are mainly three schemes for the existing dimming and shutdown circuits of LED power supplies. [0003] Solution 1: Add the standby power supply as the power supply (VCC) of the dimming control circuit, and control the shutdown and restart of the primary IC through a stable VCC. [0004] Advantages: the output voltage can be completely turned off when the dimming is turned off, and the implementation method is simple and reliable; the power supply VCC of the dimming control circuit can be completely autonomously controllable. [0005] Disadvantages: complicated wiring and high cost. In addition, the standby power supply needs to meet the requirements of safety regulations, and the PCB space needs to be increased, resulting in a large power supply. [0006...

Claims

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Application Information

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IPC IPC(8): H05B45/3725
CPCH05B45/3725
Inventor 罗赞兴游伏生
Owner 迈思普电子股份有限公司
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