Method and circuit for maintaining minimum conduction angle of SCR dimming
A conduction angle and silicon dimming technology, which is applied to light sources, electric light sources, electrical components, etc., can solve the problems of flickering lights and inability to adjust to the minimum brightness
Active Publication Date: 2020-02-14
SHENZHEN MERRYTEK TECHNOLOGY CO LTD
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[0003] In view of the above defects, the purpose of the present invention is how to solve the problem that the existing thyristor dimming occurs light flickering in low-end dimming and cannot be adjusted to the minimum brightness
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[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0016] figure 1 It is the block diagram of the SCR dimming minimum conduction angle maintenance circuit system; including filter circuit, controllable load circuit, phase detection circuit, signal detection circuit and power topology circuit; the filter circuit extracts the AC input phase-cutting signal for rectification and filtering, and extracts The corresponding signal avoids the interference of AC phase-cutting signal clutter. Since the LED drive power supply...
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The invention discloses a method for maintaining the minimum conduction angle of thyristor dimming. An LED drive power supply controls the conduction degree of the thyristor in the dimmer through an external thyristor dimmer to realize phase-cut dimming of the LED drive power supply. It is characterized in that a controllable load circuit is added to the LED drive power supply, and a detection circuit for detecting the AC loop voltage is added. When the detection circuit for detecting the AC loop voltage detects that the conduction angle of the thyristor cannot be reliably maintained, the control The conduction degree of the controllable load circuit maintains the conduction angle of the thyristor to conduct normally, so that the LED drive power supply can continuously adjust to the lowest current output. When the conduction angle of the thyristor is adjusted to be able to reliably maintain conduction, The control controllable load circuit is disconnected. In the present invention, by adding a controllable load circuit and adjusting the controllable load circuit, the reliable conduction of the thyristor can be ensured when the brightness is low, and at the same time, a full range of brightness adjustment can be realized without any flickering, and the power consumption of the whole machine and the power supply efficiency is not affected.
Description
technical field [0001] The invention relates to the technical field of LED power supplies, in particular to a method and a circuit for maintaining the minimum conduction angle of a thyristor dimming. Background technique [0002] In recent years, with the rise of the global thyristor dimmable LED power supply lighting market, thyristor dimmable LED power supply has the advantages of convenient installation and wiring for users, and the simple transformation of old buildings with already laid lighting lines into LED lighting solutions with dimming function. And use more and more. Many LED manufacturers, including China, have placed thyristor dimming power supply lighting products in an important position in market development. However, at present, the most commonly used method of thyristor dimming LED power supply is to limit the peak value and root mean square value of the input voltage through the phase cut of the AC input voltage to limit the output power to achieve the d...
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/40H05B45/00
Inventor 杨超邹高迪
Owner SHENZHEN MERRYTEK TECHNOLOGY CO LTD