Abstract: An LED driving circuit for driving an LED unit includes a power source, a detection circuit, a charging-discharging circuit, and a control circuit. The power source is coupled to the input node of the LED unit. The detection circuit is coupled to the output node of the LED unit, wherein the detection circuit is arranged to generate a detection signal according to an output signal of the LED unit. The charging-discharging circuit includes a resistive circuit, a first diode and an energy storing circuit. When a charging path is enabled, the energy storing circuit is charged by the power source. When a discharging path is enabled, the energy storing circuit is discharged to the LED unit. The control circuit is coupled to the detection circuit, the charging path and the discharging path, for selectively enabling the charging path or the discharging path according to the detection signal.

Abstract: An LED driving circuit for driving an LED unit includes a power source, a detection circuit, a charging-discharging circuit, and a control circuit. The power source is coupled to the input node of the LED unit. The detection circuit is coupled to the output node of the LED unit, wherein the detection circuit is arranged to generate a detection signal according to an output signal of the LED unit. The charging-discharging circuit includes a resistive circuit, a first diode and an energy storing circuit. When a charging path is enabled, the energy storing circuit is charged by the power source. When a discharging path is enabled, the energy storing circuit is discharged to the LED unit. The control circuit is coupled to the detection circuit, the charging path and the discharging path, for selectively enabling the charging path or the discharging path according to the detection signal.

Abstract: A light emitting diode driving circuit is provided for driving a first LED unit and a second LED unit. The light emitting diode driving circuit includes a power supply, a detection unit, a serial-parallel circuit, and a control unit. The serial-parallel circuit is coupled to the first LED unit and the second LED unit and establishes a serial connection or a parallel connection for the first LED unit and the second LED unit. The detection unit is coupled to an output end of the power supply for generating a corresponding detection signal according to an output voltage of the power supply. The control unit is arranged between the detection unit and the serial-parallel circuit. The control unit determines the first LED unit and the second LED unit to be set up in the serial connection or in the parallel connection according to the corresponding detection signal.

Abstract: A light emitting diode driving circuit is provided for driving a first LED unit and a second LED unit. The light emitting diode driving circuit includes a power supply, a detection unit, a serial-parallel circuit, and a control unit. The serial-parallel circuit is coupled to the first LED unit and the second LED unit and establishes a serial connection or a parallel connection for the first LED unit and the second LED unit. The detection unit is coupled to an output end of the power supply for generating a corresponding detection signal according to an output voltage of the power supply. The control unit is arranged between the detection unit and the serial-parallel circuit. The control unit determines the first LED unit and the second LED unit to be set up in the serial connection or in the parallel connection according to the corresponding detection signal.

Abstract: An LED driving circuit includes a charging-discharging circuit and a constant-current unit. The charging-discharging circuit is coupled to an AC current source, and includes an impedance, a diode and an energy storing circuit. The energy storing circuit is coupled to the impedance, the diode, and an LED unit. The constant-current unit is coupled to the charging-discharging circuit in series, and is arranged to regulate current. During the positive half cycle of the AC current source, the constant-current unit charges the energy storing circuit via the impedance; and during the negative half cycle of the AC current source, the energy storing circuit provides the LED unit with a discharging current via the diode, making the driving current of the LED driving circuit remain stable even when the AC current changes from the positive half cycle to the negative half cycle, thus preventing the flicker effect.