Patent ID: 10056819

Abstract:
A timing regulation circuit includes a fixed and tunable timer. A current source generates a source current I1 proportional to an inductor voltage ΔV1 of a DC-DC converter during an energizing phase and a current source generates a sink current I2 proportional to inductor voltage ΔV2 during a de-energizing phase. The fixed timer controls a first switch in series with I1 or I2 and the tunable timer controls a balancing switch in series with the other current. I1 or I2 is coupled by the first switch and the other current is coupled by the balancing switch to a common capacitor that provides a regulation voltage to the tunable timer which outputs a regulated duration (Tregulated) for an energizing or de-energizing phase. When Tregulated closes the balancing switch the common capacitor provides a predicted current returning inductor current to a starting value when all phases finish for providing a volt-second balance.