LED drive circuit
A technology of LED drive and LED array, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., and can solve the problem of load current fluctuating with voltage
Inactive Publication Date: 2014-11-26
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0003] The embodiment of the present invention discloses an LED driving circuit, which is used to solve the problem that the load current fluctuates with the voltage of the traditional resistance-capacitance step-down LED driving circuit, so that the current flowing through the LED is not affected by the fluctuation of the input voltage.
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[0018] 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 making creative efforts belong to the protection scope of the present invention.
[0019] The embodiment of the present invention discloses an LED driving circuit, which is used to solve the problem that the load current of the traditional RC step-down LED driving circuit fluctuates with the voltage, so that the current flowing through the LED is not affected by the fluctuation of the input voltage. Each will be described in detail below.
[0020] see figure 1 , figure 1 It is a LED driving circuit diagram disclosed by the embodiment of th...
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Abstract
The invention discloses an LED drive circuit comprising a buck capacitor C1, a charge discharge resistor R1, rectifier diodes D1-D4, a filter capacitor C2, constant current diodes D5-D6 and an LED array, wherein the buck capacitor C1 is connected in parallel with the charge discharge resistor R1; one end of the charge discharge resistor R1 is electrically connected with the negative electrode of the rectifier diode D1; the negative electrode of the rectifier diode D1 is electrically connected with the positive electrode of the rectifier diode D2; the negative electrode of the rectifier diode D2 is electrically connected with the negative electrode of the rectifier diode D4; the positive electrode of the rectifier diode D4 is electrically connected with the negative electrode of the rectifier diode D3; the positive electrode of the rectifier diode D3 is electrically connected with the positive electrode of the rectifier diode D1; the negative electrode of the rectifier diode D2 and the negative electrode of the rectifier diode D4 are electrically connected with the positive electrode of the filter capacitor C2; the negative electrode of the filter capacitor C2 is electrically connected with the positive electrode of the rectifier diode D1 and the positive electrode of the rectifier diode D3; the negative electrode of the rectifier diode D2 and the negative electrode of the rectifier diode D4 are electrically connected with the positive electrode of the constant current diode D5 and the positive electrode of the constant current diode D6; the negative electrode of the constant current diode D5 and the negative electrode of the constant current diode D6 are electrically connected with the positive electrode of the LED array; the negative electrode of the LED array is electrically connected with the positive electrode of the rectifier diode D1 and the positive electrode of the rectifier diode D3; and an input voltage is connected between the other end of the charge discharge resistor R1 and the negative electrode of the rectifier diode D3. The LED drive circuit can effectively prevent LED luminescence flicker, and the LED is prevented from being burnt out due to over-large current.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an LED driving circuit. Background technique [0002] At present, there are various RC step-down LED drive circuits in the industry. However, the output voltage of these LED drive circuits is unstable and will fluctuate with the fluctuation of the input voltage. LEDs are very sensitive to voltage. A small input voltage fluctuation will cause large fluctuations in the current flowing through the LED. On the one hand, the unstable current flowing through the LED will cause the LED to glow and flicker, and on the other hand, it may burn out the LED due to excessive current. Contents of the invention [0003] The embodiment of the present invention discloses an LED driving circuit, which is used to solve the problem that the load current of the traditional RC step-down LED driving circuit fluctuates with the voltage, so that the current flowing through the LED is not af...
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Inventor 周明杰邵贤辉
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD