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White LED constant-current drive power supply

A constant current drive and power supply technology, applied in the electronic field, can solve problems such as output voltage and current instability, achieve the effects of eliminating harmonic and radio wave interference, ensuring stability, and improving withstand voltage and dynamic range

Inactive Publication Date: 2016-09-28
CHENGDU ANGDIJIA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the white LED power supply in the prior art has unstable output voltage and current due to external electromagnetic wave interference, and to provide a white LED constant current drive power supply

Method used

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  • White LED constant-current drive power supply

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Embodiment

[0016] Such as figure 1 As shown, the present invention is mainly composed of a voltage stabilizing chip U, a transformer T, a resistor R1, a polar capacitor C1, a polar capacitor C2, a diode D1, a diode D2, an operational amplifier circuit, and a second-order filter circuit.

[0017] During implementation, the positive pole of the polarity capacitor C2 is connected to the VIN pin of the voltage stabilizing chip U through the resistor R1, and its negative pole is grounded. The anode of the polarity capacitor C1 is connected to the N pole of the diode D1, and the cathode thereof is grounded. The P pole of the diode D2 is connected to the non-identical terminal of the secondary inductance coil of the transformer T, and its N pole is connected to the negative pole of the polarity capacitor C1. The operational amplifier circuit is connected to the N pole of the diode D1 and the voltage stabilizing chip U respectively. The second-order filtering circuit is connected with the oper...

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PUM

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Abstract

The invention discloses a white LED constant-current drive power supply. The white LED constant-current drive power supply is characterized by mainly comprising a voltage stabilizing chip U, a transformer T, a diode D1, a polar capacitor C2, a polar capacitor C1, a diode D2, an operational amplifier circuit and a second-order filter circuit, wherein a P electrode of the diode D2 is connected with a non-dotted terminal of a secondary induction coil of the transformer T and an N electrode is connected with a negative electrode of the polar capacitor C1; the operational amplifier circuit is connected with the N electrode of the diode D1 and the voltage stabilizing chip U separately; and the second-order filter circuit is connected with the operational amplifier circuit. According to the white LED constant-current drive power supply, the voltage resistance and the dynamic range of voltage can be effectively improved; and a middle zero point offset of current can be controlled within 0.5nA, so that the stability of output voltage and current is ensured; and the stability of the brightness of a white LED is effectively ensured.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a white LED constant current drive power supply. Background technique [0002] As a new type of energy-saving light source, white LED lights have been widely accepted and adopted by people due to their environmental protection, energy saving, long life, and small size. Since the white light LED is a characteristic sensitive semiconductor device and has negative temperature characteristics, the white light LED power supply plays a very important role in promoting the white light LED to be in a stable working state during the application process. The currently used white LED power supply has the problem of unstable output voltage and current due to external electromagnetic wave interference, resulting in unstable brightness of the white LED lamp, thereby affecting the service life of the white LED lamp. [0003] Therefore, it is urgent to provide a white LED constant current power suppl...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/40H05B45/37
Inventor 不公告发明人
Owner CHENGDU ANGDIJIA TECH CO LTD