PWM signal dimming circuit and method for three-phase AC power supply LED lamp
A PWM signal, LED lamp technology, applied in the use of semiconductor lamps, electrical components, etc., can solve the problems of no convenience, reduce costs, etc., and achieve the effect of convenient dimming, convenient use, and less peripheral circuits
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Embodiment 1
[0054] Such as figure 1 As shown, the basic way to realize the dimming function in this embodiment is: after the external PWM signal is input through the isolated optocoupler circuit, after passing through the input impedance matching circuit, a dimming signal voltage is generated and provided to the driver chip circuit, and the driver chip circuit The output of the MOS transistor switch circuit is controlled according to the change of the dimming signal voltage and the change of the current signal collected by the LED load circuit, and the MOS transistor switch circuit controls the power change of the LED load circuit. Specifically: when the duty cycle of the PWM signal of the external dimming controller becomes larger, the voltage of the dimming signal collected by the dimming control pin Is of the driver chip U2 becomes larger after the isolation optocoupler circuit and the input impedance matching circuit , the output voltage of the output power control pin OUT of the driv...
Embodiment 2
[0056] Such as figure 2 As shown, in this embodiment, the pins of the driver chip U2 are defined as follows: pin 1 is the negative terminal of the power supply, grounded, pin 2 is the dimming control pin, connected with resistors and capacitors, and pin 3 is suspended, which is an empty tube Pin 4 is the current sampling pin, which is connected to the current sampling resistor and controlled by pin 2. The pin 5 of the driver chip U2 is the load output pin, and the pin 6 of the driver chip U2 is suspended, which is an empty pin. Pin 7 of U2 is the output control pin, and pin 8 of the driver chip U2 is the positive terminal of the power supply, which is connected to VCC.
[0057] The model of isolated optocoupler U1 is PC817, the driver chip U2 is M3103 of Hefei Yunshan Photoelectric Technology Co., Ltd., the model of diode D1 is 1N4001, the model of MOS transistor Q1 is 1N80, the resistance of resistor R1 is 1K ohms, the resistance of R2 is 100 ohms, and the resistance of The...
Embodiment 3
[0059]Similar to the above two embodiments, in this embodiment, a PWM signal dimming method and circuit for a three-phase 380V tunnel LED lamp driver chip interface, including an isolated optocoupler U1, a driver chip U2, a diode D1, a MOS Transistor Q1, resistor R1, resistor R2, resistor R3, resistor R4, resistor Rs, capacitor C1, capacitor C2, capacitor C3, etc. The pin 1 of the isolated optocoupler U1 is connected to the positive phase of the external PWM signal input PWM, the pin 2 of the isolated optocoupler U1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the negative phase of the external PWM signal input PWM , pin 3 of the isolated optocoupler U1 is connected to pin 8 of the driver chip U2 through a resistor R1, and is connected to the positive end of the diode D1 at the same time, and pin 4 of the isolated optocoupler U1 is connected to the power ground. The negative end of the diode D1 is connected to pin 2 of the dr...
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