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Visual perception self-adaptive LED dimming compatible method

A visual perception and self-adaptive technology, applied in the field of LED dimming, can solve the problem that nonlinear characteristics are difficult to obtain linearity, etc.

Active Publication Date: 2021-05-07
NANJING VOCATIONAL UNIV OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for LEDs, etc., firstly, it is not easy to obtain good linearity due to its nonlinear characteristics, and secondly, its luminous intensity exhibits a certain degree of exponential form with the value of current.

Method used

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  • Visual perception self-adaptive LED dimming compatible method
  • Visual perception self-adaptive LED dimming compatible method
  • Visual perception self-adaptive LED dimming compatible method

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Embodiment Construction

[0029] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0030] like Figure 1 to Figure 5 As shown, a visual perception adaptive LED dimming compatible method includes a driving circuit, and the driving circuit is composed of a dimming input module 101, an ignition module 102, a bridge stack and a filter module 103, a DC / DC converter 104, a dummy The load module 105 is coupled with the MHz drive and control module 106, and the MHz drive and control module 106 is also externally connected to a photoelectric converter 107;

[0031] The dimming input module 101 includes a TRIAC dimmer and a series noise suppression resistor RF1 on the input bus;

[0032] The ignition module 102 is composed of a capacitor C1 and a resistor R1, and the ignition module 102 immediately draws a large current at the moment of ...

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Abstract

The invention discloses a visual perception self-adaptive LED dimming compatible method, which adopts a GaN-based high electron mobility transistor (GaN HEMT) and a drive circuit thereof to replace a traditional silicon-based MOSFET to realize a MHz high-frequency working environment. Due to the fact that the frequency is greatly improved, values of filtering capacitance and inductance can be reduced, impact current and current oscillation in a circuit can be greatly reduced, and TRIAC dimming compatibility is improved. The visual perception self-adaptive LED dimming compatible method adopts an MHz third-generation GaN-based wide bandgap semiconductor technology and an analog-digital combined phase angle detection technology, introduces a current outer ring, and accesses a new function electronic dummy load linked with LED output, so that the linearity of a product is obviously improved. A light path closed-loop control technology and a visual perception optimization technology are combined and adopted, so that an output dimming angle-light intensity curve of a product can well accord with visual perception characteristics, and the comfort level of a user is improved. In addition, by adopting the new function electronic dummy load linked with the LED output, the dimming range can be effectively expanded, and enough starting current can be provided for the TRIAC.

Description

technical field [0001] The invention relates to the field of LED dimming, in particular to a visual perception adaptive LED dimming compatible method. Background technique [0002] TRIAC thyristor dimmer can adjust the effective value of the input AC voltage and then adjust the brightness of the LED output. It was originally used for dimming incandescent lamps. Incandescent lamps present purely resistive characteristics, which can be applied to TRIAC thyristor dimming. Because the new generation of solid-state LED lighting is actually a low-voltage diode, in order to obtain high driving efficiency, it usually needs to be powered by a nonlinear high-frequency constant-current switching power supply. However, the nonlinearity of high-frequency constant current switching power supply makes it difficult to be compatible with TRIAC thyristor dimmers. [0003] Due to the inertia of the market, there are still a large number of TRIAC thyristor dimming methods. Therefore, it is ve...

Claims

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Application Information

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IPC IPC(8): H05B45/30H05B45/37
CPCH05B45/30H05B45/37Y02B20/30
Inventor 雷建明
Owner NANJING VOCATIONAL UNIV OF IND TECH
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