Abstract: A light-emitting diode (LED) smart control circuit and the related LED lighting device are provided. The LED smart control circuit includes a microprocessor, a bridge rectifier, a transformer circuit, a power grid detection unit, a voltage detection unit, a battery charging controller, a first sampling circuit, a second sampling circuit, a constant current controller, and an external rechargeable battery. The LED smart control circuit is configured for controlling LED light source components to emit light. An LED lighting device includes the LED light source components, a smart control circuit board, a rechargeable battery, a shell, and a lamp head. The smart control circuit board is integrated with the disclosed LED smart control circuit.

Abstract: A power circuit for an LED lighting device including an alternative current (AC) power supply, a dimmer, a transformer and a dimming control circuit. The dimming control circuit includes a filtering unit configured to filter a voltage signal outputted from the transformer and a rectifying unit configured to receive the signal outputted from the filtering unit and rectify the signal to a DC signal. The dimming control circuit also includes a boost converter unit configured to boost the received DC voltage to a needed DC voltage and a voltage feedback control circuit unit configured to control the DC voltage boosted by the boost converter unit. Further, the dimming control circuit includes a buck converter unit configured to convert the boosted DC voltage to the voltage and current needed by the LED lighting device and a digital control unit configured to automatically adjust current strength needed by the buck converter unit.

Abstract: A light-emitting diode (LED) smart control circuit and the related LED lighting device are provided. The LED smart control circuit includes a microprocessor, a bridge rectifier, a transformer circuit, a power grid detection unit, a voltage detection unit, a battery charging controller, a first sampling circuit, a second sampling circuit, a constant current controller, and an external rechargeable battery. The LED smart control circuit is configured for controlling LED light source components to emit light. An LED lighting device includes the LED light source components, a smart control circuit board, a rechargeable battery, a shell, and a lamp head. The smart control circuit board is integrated with the disclosed LED smart control circuit.

Abstract: A power circuit for an LED lighting device including an AC power supply, a dimmer and a control circuit is provided. The control circuit includes a filtering unit configured to filter a voltage signal coming from the dimmer and a rectifying unit configured to receive the signal outputted from the filtering unit and rectify the signal to a DC signal. The control circuit also includes a transformer unit connected to the rectifying unit. Further, the control circuit includes a dimmer phase detection unit configured to sample the rectified voltage signal at point K and convert the voltage signal to a low voltage pulse signal and a flyback conversion unit configured to receive the pulse signal outputted by the dimmer phase detection unit and adjust a current flowed through the transformer unit and a first transistor to control the output current to the LED lighting device.

Abstract: A power circuit for an LED lighting device including an AC power supply, a dimmer and a control circuit is provided. The control circuit includes a filtering unit configured to filter a voltage signal coming from the dimmer and a rectifying unit configured to receive the signal outputted from the filtering unit and rectify the signal to a DC signal. The control circuit also includes a transformer unit connected to the rectifying unit. Further, the control circuit includes a dimmer phase detection unit configured to sample the rectified voltage signal at point K and convert the voltage signal to a low voltage pulse signal and a flyback conversion unit configured to receive the pulse signal outputted by the dimmer phase detection unit and adjust a current flowed through the transformer unit and a first transistor to control the output current to the LED lighting device.

Abstract: A power circuit for an LED lighting device including an alternative current (AC) power supply, a dimmer, a transformer and a dimming control circuit. The dimming control circuit includes a filtering unit configured to filter a voltage signal outputted from the transformer and a rectifying unit configured to receive the signal outputted from the filtering unit and rectify the signal to a DC signal. The dimming control circuit also includes a boost converter unit configured to boost the received DC voltage to a needed DC voltage and a voltage feedback control circuit unit configured to control the DC voltage boosted by the boost converter unit. Further, the dimming control circuit includes a buck converter unit configured to convert the boosted DC voltage to the voltage and current needed by the LED lighting device and a digital control unit configured to automatically adjust current strength needed by the buck converter unit.