| 摘要 |
PURPOSE:To use a high-voltage battery without changing the specification of load. CONSTITUTION:A headlight 2 having 12V specifications is connected to the positive side thermal of the high-voltage battery 1 of a 24V power supply, and the headlight 2 is driven by an FET 6. A switch 3, a voltage fluctuation detector 4 and a variable duty PWM control circuit 5 are connected to the negative side terminal of the battery 1 in the order, a duty ratio, where the workload of the headlight 2 is equalized to the time of 12V, is set by the PWM control circuit 5, and the FET 6 is switching-controlled and the headlight 2 is driven. The fluctuation of supply voltage is detected by the voltage fluctuation detector 4, and the duty ratio is corrected in response to the fluctuation width. Accordingly, even when the high-voltage battery 1 is used, the battery 1 can be employed without changing conventional load. The duty ratio is corrected in response to the fluctuation of supply voltage, thus conducting fixed workload to load at all times regardless of voltage fluctuation. |
