| 摘要 |
A control circuit for a switching regulator having an inductor, said control circuit having a first controller J to switch between a positive voltage and an alternating voltage across said inductor, and a second controller K to switch between a negative voltage and said alternating voltage across said inductor. The first controller J and second controller K normally alternate to operate said switching regulator in half-bridge switching mode to produce a current waveform in said inductor, with the timing of switching instants calculated to achieve an average current error signal close to or near zero, based on timing of previous switching instances. When it is calculated that a desired zero crossing time of the current error signal will be overshot, the control circuit starts the inactive controller of the first and second controllers J and K to cause the inactive controller to operate when the desired zero crossing time has been overshot, to bring said current error signal rapidly to zero crossing. Both the first and second controllers J and K will operate the switching regulator in plural half bridge switching mode until it is determined that a desired zero crossing time of the current error signal is reached early, whereafter half bridge switching mode operation of the switching regulator is resumed.
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