| 摘要 |
Driver circuits (1) for driving load circuits (2) comprising first and second light circuits (21-22, 71-72) are in first / second modes for input voltages having first / second voltage amplitudes, the second voltage amplitudes being larger than the first voltage amplitudes. The first light circuits (21, 71) are on in the first and second modes. The second light circuits (22, 72) are off in the first modes and are on in the second modes. A control circuit (31-34, 41, 42, 81-84, 101, 121-130) controls amplitudes of currents flowing through at least the first light circuit (21, 71) in dependence of the modes to extend control. These currents may get smaller current amplitudes in higher modes. Light outputs of the first light circuit (21, 71) may get smaller in higher modes. A total light output of all light circuits (21- 22, 71-72) may remain substantially constant during all modes. |
