Surge current limiting type high-impedance constant-current luminescent LED (light emitting diode) power circuit
A surge current and power supply circuit technology, applied in the field of high impedance constant current cold light LED power supply circuit, can solve the problems of unstable output current, poor load capacity, etc. Effect
Inactive Publication Date: 2016-07-27
CHENGDU ANGDIJIA TECH CO LTD
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the disadvantages of poor load capacity and unstable output current in the LED voltage circuit in the prior art, and provide a high-impedance constant-current power supply circuit for cold light LEDs with surge current limitation
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[0025] Such as figure 1 As shown, the present invention is mainly composed of a control chip U2, a transformer T, a diode rectifier U1, a polar capacitor C1, a polar capacitor C5, an inductor L1, an inrush current limiting circuit, a high impedance amplifier circuit, a constant current drive circuit, and a thyristor trigger circuit. , a reference current correction circuit, and a low-pass filter circuit.
[0026] In practice, the negative pole of the polarity capacitor C1 is connected to the positive output terminal of the diode rectifier U1, and its positive pole is connected to the negative output terminal of the diode rectifier U1. The negative pole of the polarity capacitor C5 is connected to the CS pin of the control chip U2, and its positive pole is connected to the RE pin of the control chip U2 after passing through the inductor L1. One end of the resistor R9 is connected to the positive pole of the polarity capacitor C5, and the other end is connected to the GND pin o...
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The invention discloses a surge current limiting type high-impedance constant-current luminescent LED (light emitting diode) power circuit.The power circuit is characterized by mainly comprising a control chip U2, a reference current correcting circuit, a low-pass filter circuit, a thyristor trigger circuit, a transformer T, a diode rectifier U1, a polar capacitor C1, a polar capacitor C5, a resistor R9, a constant-current drive circuit, a high-impedance amplifying circuit and a surge current limiting circuit, wherein the high-impedance amplifying circuit is serially connected between the reference current correcting circuit and the thyristor trigger circuit, and the surge current limiting circuit is serially connected between the low-pass filter circuit and the reference current correcting circuit.The surge current limiting type high-impedance constant-current luminescent LED power circuit has the advantages that filtering of voltage and current of an input end can be realized to make input voltage and current more stable, intensity of the filtered voltage and current can be adjusted to keep movement of electromagnetic waves of the current in a constant-speed state, and accordingly stable working current output can be realized, and LED brightness stability is guaranteed.
Description
technical field [0001] The invention relates to the field of electronic energy saving, in particular to a power supply circuit for a high-impedance constant-current cold-light LED with surge current limitation. Background technique [0002] At present, due to the characteristics of low energy consumption, long service life, safety and environmental protection, LED lamps have become one of the mainstream products for people's living lighting. Since LED lamps are different from traditional incandescent lamps, they need to be driven by a dedicated power supply circuit. However, the current power supply circuit used in LED lamps is not only vulnerable to external voltage fluctuations, but also has poor load capacity and unstable output current, which leads to unstable brightness, power consumption, and short service life of LED lamps. [0003] Therefore, it is urgent to provide an LED power supply circuit that can not only increase the load capacity, but also ensure the stabili...
Claims
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Login to View More IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 周建英
Owner CHENGDU ANGDIJIA TECH CO LTD