Low-cost high-performance light-emitting diode (LED) constant current driving circuit
A constant-current drive, high-performance technology, applied in electric lamp circuit layout, electric light source, lighting devices, etc., can solve the problems of high power consumption, low PF, and high development cost of the drive circuit, and achieve low cost, high PF value, and circuit simple effect
Inactive Publication Date: 2012-08-01
余塘
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Problems solved by technology
However, the existing LED constant current drive circuits are generally designed for LEDs with specific powers, that is, LEDs with different powers require different constant current drive circuits, and a constant current drive circuit can only be used for LEDs of a certain specification. Limited and expensive to develop
In addition, the existing LED constant current drive circuit still has disadvantages such as low PF (power factor) value, high harmonics, and high radiation, which makes the power consumption of the drive circuit itself large, and the efficiency of the entire LED system is low.
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[0011] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.
[0012] Such as figure 1 As shown, the low-cost high-performance LED constant current drive circuit of the present invention includes an input terminal, a rectification filter circuit, a power factor correction circuit, a buffer auxiliary circuit, an adjustable resistor R10 and an output terminal.
[0013] Specifically, the rectification and filtering circuit is composed of a fuse F1, a thermistor RV1, a bridge rectifier diode BD1 and a capacitor C1. The power factor correction circuit is composed of resistors R1-R2, capacitor C2 and transistor Q1. The buffer auxiliary circuit is composed of resistors R3-R10, capacitors C3-C4, field effect transistor Q2 and triode Q3.
[0014] The working principle of the present invention is as follows:
[0015] When the circuit output terminals LED+ and LED- are connected to the corresponding LEDs, the input te...
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The invention relates to the technical field of light-emitting diode (LED) driving circuits, in particular to a low-cost high-performance LED constant current driving circuit, which comprises an input end, a rectification filter circuit, a power-factor correction circuit, a buffer auxiliary circuit, an adjustable resistance and an output end. Specifically, the rectification filter circuit comprises a fuse protector F1, a thermistor RV1, a bridge rectifier diode BD1 and a capacitance C1. The power-factor correction circuit comprises a resistance R1, a resistance R2, a capacitance C2 and an audion Q1. The buffer auxiliary circuit comprises resistances ranging from R3 to R9, capacitances ranging from C3 to C4, a field-effect tube Q2 and an audion Q3. The LED constant current driving circuit not only has characteristics in universality and reliability of light-emitting diodes, but also has the advantages of being simple in circuit, low in cost, high in power factor (PF) value, low in harmonic and radiation and the like. However, existing constant current driving circuits can not have all the advantages above.
Description
Technical field: [0001] The invention relates to the technical field of LED drive circuits, in particular to a low-cost, high-performance LED constant current drive circuit. Background technique: [0002] The constant current power supply method is an ideal power supply method for LED and LED products. The constant current power supply method can avoid the current fluctuation caused by the change of the LED forward voltage, and at the same time, the constant current makes the LED brightness stable. Therefore, the existing LED drive circuit is in the In addition to meeting the safety requirements during design, the constant current characteristics should also be maintained as much as possible. However, the existing LED constant current drive circuits are generally designed for LEDs with specific powers, that is, LEDs with different powers require different constant current drive circuits, and a constant current drive circuit can only be used for LEDs of a certain specificatio...
Claims
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IPC IPC(8): H05B37/02
Inventor 余塘
Owner 余塘