A led drive circuit
An LED driver and circuit technology, which is applied in the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve the problems of high frequency interference, high cost, and easy damage.
Inactive Publication Date: 2014-10-01
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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Problems solved by technology
[0003] At present, DC-DC chopping technology is used to drive LED in low-voltage places. It has the advantages of low power consumption, high efficiency, stability and reliability, small size per unit power, light weight, etc., but its cost is high, the circuit is complicated, and easy to use. Damage, strong high-frequency interference and other shortcomings, which bring inconvenience to users
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[0020] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0021] An embodiment of the present invention is an LED driving circuit, which includes a power supply, an energy storage inductor L1, a transistor Q1, a sampling resistor R3, a MOS transistor Q2, a self-locking switch S1, a resistor R1, a resistor R2, a voltage dividing resistor R4, Voltage dividing resistor R5 and constant current control chip U1. Alternatively, the drive circuit may also include one or more LEDs.
[0022] Starting from the positive pole of the power supply, connect the positive pole of the power supply, the energy storage inductor L1, the anode of the LED, the cathode of the LED, the collector of the transistor Q1, the emitter of the transistor Q1, the sampling resistor R3, the drain of the MOS transistor Q2, the source of the MOS transistor Q2 and the negative pole of the power supply. For example, R3 is 0.043R, which i...
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The invention relates to a light-emitting diode (LED) driving circuit. According to the LED driving circuit, current passes through a power supply positive electrode, an energy storage inductor, an LED anode, an LED cathode, a triode collector, a triode emitter, a sampling resistor, a metal oxide semiconductor (MOS) tube source, an MOS tube drain and a power supply negative electrode sequentially; the power supply positive electrode is connected to an MOS tube grid by a self-locking switch and a voltage division circuit; a pin 1 of a constant-current control chip is a power supply input pin and is connected with the power supply positive electrode; a pin 2 is a ground (GND) pin; a pin 3 is an effective operating enabling pin with a high level, is connected with the power supply positive electrode by a resistor R1 and is connected with the pin 2 by a resistor R2; a pin 4 is a current detection pin; a pin 5 is a voltage detection feedback pin, the pin 4 and the pin 5 are connected and are connected with the triode emitter and the sampling resistor respectively, and the other end of the sampling resistor is connected with the pin 2; and a pin 6 is a pulse-width modulation (PWM) driving pin and is connected with a triode base. The LED driving circuit also comprises a filter capacitor which is connected in parallel with an LED.
Description
【Technical field】 [0001] The invention relates to an LED driving circuit, in particular to an LED constant current driving circuit. 【Background technique】 [0002] With the continuous development of science and technology, new products and new technologies are constantly innovating. As a new light source, LED has the characteristics of energy saving, environmental protection and high efficiency. The technology has been mature and applied in various fields. A variety of LED driver circuits have been developed. [0003] At present, DC-DC chopper technology is used to drive LEDs in low-voltage places. It has the advantages of low power consumption, high efficiency, stability and reliability, small volume per unit of power, and light weight, but its cost is high, the circuit is complex, and it is easy to Damage, strong high-frequency interference and other shortcomings, bring inconvenience to users. [0004] Therefore, there is a need for improvement in the prior art. [Conte...
Claims
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IPC IPC(8): H05B37/02
Inventor 周明杰孙占民
Owner OCEANS KING LIGHTING SCI&TECH CO LTD