Patent ID: 8803342

Claim:
An energy scavenging device, comprising: an electromagnetic transducer configured to generate a current in response to accelerations impressed thereto; a power switching stage to be input with current generated by said electromagnetic transducer, and comprising a network of controlled switches and output nodes coupled thereto; said network of controlled switches configured to alternately deliver to said output nodes an output current that does not invert its sign, and to short-circuit said electromagnetic transducer; an output capacitor coupled between said output nodes and having first and second terminals; and a controller having a sensor coupled to said electromagnetic transducer configured to sense current flowing therethrough, said controller configured to drive said network of controlled switches to selectively short-circuit said electromagnetic transducer and direct the current flowing through said electromagnetic transducer to charge said output capacitor; said power switching stage comprising a high-side switch and a low-side switch coupled in series to short-circuit said electromagnetic transducer when both closed, and a common terminal between the high-side switch and low-side switch being coupled to said first terminal of said output capacitor, and a high-side diode and a low-side diode each coupled between said second terminal of the output capacitor and said common terminal of said high-side switch and said low-side switch.