| 摘要 |
PURPOSE:To provide a power controller which can perform a constant power control after receiving a power value command signal, etc., which is given from outside. CONSTITUTION:The output of a current monitoring circuit 5 and the output of a voltage monitoring circuit 6 are multiplied by each other in an integration circuit 20 and the output of the circuit 20 is compared with a power value command signal 24. When the signal 24 is larger, a count-up instruction is sent to an up/down counter 12 and when the signal is smaller, a count-down instruction is sent. According to the instruction, the counter 12 counts up or down rectangular waves output from a rectangular wave generating circuit 14 and a D/A converter 11 converts the counted value into an analog signal and then the analog signal is inputted into a PWM circuit 30 through a filter 10. According to the analog signal, the PWM circuit 30 controls the on/off duty of a power switch 3. |
