| 摘要 |
A switching power supply suitable for driving a load whose load current may fluctuate abruptly comprises a main circuit unit including a switching circuit for converting a DC input voltage to an AC voltage and an output circuit for rectifying the AC voltage to produce a DC output voltage, and a control circuit for controlling the operation of the main circuit unit, the transfer function of the control circuit assuming a first value when the load current supplied by the main circuit unit changes at a rate not exceeding a prescribed rate and assuming a second value exceeding the first value when the load current changes at a rate exceeding the prescribed rate. The switching power supply therefore exhibits markedly improved transient response when the load current changes at a rate exceeding the prescribed rate because the transfer function of the control circuit is increased relative to that under normal condition.
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