Abstract:
The invention provides a lamp circuit of a light emitting device, which comprises a capacitor, a rectification unit, a current limiting unit, and a light emitting device. The capacitor is connected to the two lamp contacts of the lamp holder of the electrical ballast to change the resonant frequency of the resonant circuit of the electrical ballast. The rectification unit is connected to the capacitor, and utilized to rectify a sine-wave voltage to a direct current voltage. The current limiting unit is connected to the rectification unit, outputting a direct current corresponding to the direct current voltage. The light emitting device is connected to the current limiting unit and the rectification unit to generate a light source. With the invention, the light emitting device can be installed directly in a lamp holder of a conventional fluorescent lamp.
Abstract:
The invention provides a direct current driving circuit of a light emitting device for driving a plurality of light emitting devices. The direct current driving circuit of the light emitting device comprises a rectification unit, a constant current unit and a light emitting module. The rectification unit is configured to rectify an outside alternate current voltage to output a direct current voltage. The constant current unit is electrically connected to the rectification unit, and generates a direct current corresponding to the direct current voltage to drive the light emitting module. The light emitting module comprises a plurality of light emitting devices and at least one diode connected in serial, and the light emitting devices are respectively connected in parallel to voltage stabilizing capacitances. The driving circuit can provide a stabilized direct current load driving with high efficiency and high power factor.