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On-chip Starter Circuit for Switched-inductor DC–DC Harvester Systems
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The challenge with charging the battery vBAT directly from nocharge conditions is its large capacity. In other words，
replenishing vBAT to practical levels from a harvesting source
that outputs little power PH requires considerable time. This is
a problem because the starter draws a small fraction of the
power that the system can harness from PH in steady state，
which means the harvester is by and large inefficient. Quickly
charging a lower capacity source from which to power the
steady-state harvester is therefore an appealing alternative.
The purpose of startup supply vST in Fig. 2 is to store and
dispense just enough energy to operate the high-efficiency
harvester across one or more energy-transfer cycles. This way，
the starter energizes vST and the power conditioner then
charges vBAT across several cycles until vBAT is high enough to
drive the switches on its own. PH therefore supplies the power
vBAT receives as PBAT， the gate-drive power vST delivers to the
drivers， and the conduction and quiescent losses the switches
and starter dissipate. Note that vST must rise to practical levels
（e.g.， 1 V） to switch the system， just as vBAT must climb to
ultimately take control of the system.
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