Patent ID: 8232740

Claim:
A capacitive current-sharing control circuit for LED lamp strings, comprising: a signal generating unit generating a driving voltage; a control unit electrically connected to the signal generating unit to control the driving voltage; a current-sharing unit electrically connected to the control unit, wherein the current-sharing unit is a capacitor; a light-emitting unit electrically connected to the current-sharing unit, and comprising: a first LED lamp string having a plurality of light emitting diodes which are electrically connected in series in forward-bias direction; and a second LED lamp string having a plurality of light emitting diodes which are electrically connected in series in reverse-bias direction; wherein the first LED lamp string is electrically connected in parallel to the second LED lamp string; whereby the control unit controls the driving voltage to provide desired voltage to the light-emitting unit to provide a current-sharing control according to the current-sharing unit, thus providing effectively a stable current source to the light-emitting unit to maintain illuminating brightness of the LED lamp strings.