A driving circuit for a light emitting diode
A technology of light-emitting diodes and driving circuits, which is applied to the layout of electric lamp circuits, light sources, electric light sources, etc., and can solve the problems of weak sampling signal of power supply voltage converter 01, large power consumption of sampling resistor R11, and difficulty in selecting the resistance value of sampling resistor R11, etc.
Active Publication Date: 2015-10-28
FORYOU MULTIMEDIA ELECTRONICS
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Problems solved by technology
[0004] However, the resistance value of the sampling resistor R11 is not easy to choose. When the resistance value of the sampling resistor R11 is too large, the power consumption of the sampling resistor R11 is too large. When the resistance value of the sampling resistor R11 is too small, the sampling signal of the power voltage converter 01 is too large. weak
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[0037] 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.
[0038] see figure 2 , the embodiment of the present invention discloses a circuit diagram of a driving circuit of a light-emitting diode, including: a power supply voltage converter 01, an inductor L1, a sampling resistor R21, a light-emitting diode LED, a first current-limiting resistor R22, a second current-limiting resistor R25, The first switch tube Q1, the second switch tube Q2 and the voltage divider circuit 02;
[0039] The pulse output end of the power vo...
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The invention provides a driving circuit of a light emitting diode. The driving circuit of the light emitting diode comprises a power source voltage converter, an inductor, a sampling resistor, the light emitting diode, a first current-limiting resistor, a second current-limiting resistor, a first switching pipe, a second switching pipe and a bleeder circuit, wherein a pulse output end of the power source voltage converter is connected with a power supply end of the light emitting diode through the inductor and the sampling resistor which are connected in series, a feedback input end of the power source voltage converter is connected with the bleeder circuit, and the power source voltage converter can regulate the pulse modulated by the pulse width output by the pulse output end by collecting the voltage of the output end of the bleeder circuit, achieves the control over the currents passing through the light emitting diode, and further drives the light emitting diode.
Description
technical field [0001] The present invention relates to the technical field of drive circuits, more specifically, to a drive circuit for light emitting diodes. Background technique [0002] LED (Light-Emitting Diode) for short, is a semiconductor device that can emit light. Since the LED has sensitive characteristics and negative temperature characteristics, it needs to be driven during the application process to keep it in a stable working state. Unlike ordinary incandescent light bulbs, LEDs can be directly connected to 220V AC mains. LEDs need to be driven by a low voltage of 2 to 3 volts. Therefore, it is necessary to design a specific driving circuit to meet the LED's demand for driving voltage. [0003] In the prior art, a power supply voltage converter and its peripheral circuits are generally used to drive the LED by controlling the current flowing through the LED. see figure 1 , a circuit diagram of a light-emitting diode drive circuit disclosed in the prior art,...
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IPC IPC(8): H05B37/02
Inventor 梁小龙
Owner FORYOU MULTIMEDIA ELECTRONICS