Patent ID: 9072140
Filing Date: 2015-06-30
Classification: F21K,F21V,H05B

Abstract:
1. A light-emitting circuit which emits light in response to a variable current, the light being emitted according to the variable current, the light-emitting circuit comprising: a first light-emitting unit which includes one or more first light-emitting elements connected in series, and through which a first branch current of the variable current flows; a second light-emitting unit which includes one or more second light-emitting elements connected in series, and through which a second branch current flows, the second branch current being a differential current between the variable current and the first branch current; and a current control element which is connected to the second light-emitting unit in series, and which adjusts the second branch current according to a differential voltage between a first total forward voltage and a second total forward voltage, the first total forward voltage being a sum of a forward voltage generated by each of the one or more first light-emitting elements, the first total forward voltage including the same number of the forward voltages as the number of the one or more first light-emitting elements, the second total forward voltage being a sum of a forward voltage generated by each of the one or more second light-emitting elements, the second total forward voltage including the same number of the forward voltages as the number of the one or more second light-emitting elements.