Patent ID: 8587346
Filing Date: 2013-11-19
Classification: H02M,H05B

Abstract:
1. A driving circuit for supplying currents to a plurality of loads, comprising: a plurality of constant current circuit sections each configured to generate and output a predetermined constant current; a plurality of current mirror circuit sections configured to generate currents respectively proportional to input currents output from the constant current circuit sections, respectively, and supply the currents to the loads, respectively, wherein each current mirror circuit section of the plurality of current mirror circuit sections includes an output transistor; a plurality of series circuits that are in series with the respective output transistors of the plurality of respective current mirror circuit sections; and a constant voltage supplying circuit section configured to generate a constant voltage in accordance with (a) a lowest output voltage amongst output voltages of the plurality of respective current mirror circuit sections and (b) a highest input voltage amongst input voltages of the plurality of respective current mirror circuit sections, and supply the constant voltage to the plurality of respective series circuits that are in series with the respective output transistors of the respective current mirror circuit sections, so that the lowest voltage amongst the output voltages of the plurality of respective current mirror circuit sections equals the highest input voltage amongst the input voltages of the plurality of respective current mirror circuit sections; wherein the constant voltage supplying circuit section comprises: