Patent ID: 7224150
Filing Date: 2007-05-29
Classification: B60L,H01S,H05B

Abstract:
1. A redundancy circuit for a diode circuit composed of a plurality of diodes connected in series, comprising: bypass circuits, each of which is connected in parallel to each group, the diode circuit being divided into a plurality of group, each group having one or more diodes connected in series, each bypass circuit including a first voltage-controlled switching device connected in parallel to the corresponding group, and a detection circuit which has a constant voltage device and a fusing circuit, both of which are connected in series, the detection circuit being connected in parallel to the corresponding group; wherein the interconnection between the constant voltage device and the fusing circuit is connected to a control terminal of the voltage-controlled switching device, and when, because of increased resistance of any diode, a voltage applied to one of the groups exceeds a given voltage defined by the constant voltage device, the voltage-controlled switching device is turned on by the control terminal so as to bypass a current that is to pass through the corresponding group.