| 摘要 |
PROBLEM TO BE SOLVED: To provide a pulse width modulation load controller capable of reducing a power source voltage change as compared with the prior art. SOLUTION: In the case of PWM controlling a plurality of loads 1 to 4 by a PWM(pulse width modulation) signal, the pulses of pulse width modulation signals PWM1 to PWM4 for driving the loads 1 to 4 are dispersed substantially at equal intervals by, for example, deviating the phase at 90 degrees by a timing control circuit 21. Thus, the superpositions of the pulses of the signals PWM1 to PWM4 are reduced, and superposition periods are dispersed. When the pulse widths are small, the period that all the pulses of the signals PWM1 to PWM4 are not excited (a common pulse interval period) is finely segmented by the pulses of the PWM signals. The change of the current flowing from a battery is enhanced in frequency, and the change is reduced. On the other hand, the impedances of a power source system or the loads have electrostatic capacity or inductance and hence the discharging current of the battery is not continuously discharged for a long period or paused for discharging, but can be easily averaged. |
