Simple and practical harmonic wave improved LED drive circuit
A kind of LED driving and practical technology, applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problems of narrow conduction angle of rectifier diode, distortion of AC input current, power factor reduction, etc., to ensure active power, reduce Total harmonic distortion, the effect of improving harmonics
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Embodiment 1
[0017] Such as figure 1 As shown, the simple and practical harmonic improved LED drive circuit of this embodiment includes a bridge rectifier module, a constant current module connected to the bridge rectifier module, an LED load, an electromagnetic interference filter and a valley filling circuit; wherein: The bridge rectifier module has two input terminals and two output terminals. The two output terminals are DC output positive pole and DC output negative pole respectively. The two input terminals are connected to the mains through the electromagnetic interference filter, and the DC output positive pole is connected to the constant current at the same time. flow modules, LED loads and valley fill circuits.
[0018] The constant current module includes a constant current control chip IC1, a MOS transistor Q1, a voltage dividing resistor R5, an adjusting resistor R6, a sampling resistor R7, and a sampling resistor R8; the positive pole of the LED load is connected to the posi...
Embodiment 2
[0024] On the basis of Embodiment 1, the small LED drive circuit in this embodiment also includes a fuse F1 for surge protection, a thermistor NTC, and a varistor UR. The fuse F1 and the thermistor NTC are inductively connected in series and the fuse F1 Connect the inductor L1, the thermistor NTC is connected to the live line L of the mains; one end of the varistor UR is connected to the neutral line N of the mains, and the other end is connected between the fuse F1 and the thermistor NTC.
[0025] In order to avoid the inrush current generated when the circuit is turned on, a power type thermistor NTC is connected in series in the power supply circuit, which can effectively suppress the inrush current when the circuit is turned on, and the thermistor The resistance value of NTC will be reduced to a very small level, and the power consumed by it can be ignored, and it will not affect the normal working current.
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