Microchip Technology Inc.

Gabriel Rosca

Richard L Hull

Zacharias Marthinus Smit

John Charais

Razvan Enachescu

Alexandru Vidrasan

A circuit for providing back-up power includes a switching circuit configured to be coupled to a first power source and a second power source. The circuit includes a domain voltage level monitor circuit coupled with the first power source and the second power source and with output of the switching circuit. The circuit includes a dynamic level shifter circuit coupled with the first power source and the second power source and an output of the domain voltage level monitor. The circuit includes a double controlled latch circuit coupled with the first power source and the second power source and an output of the dynamic level shifter circuit. The double controlled latch circuit is configured to provide control signals to the switching circuit.

Seamless switching control for low power battery backup system

A mains voltage zero-crossing detector has a constant voltage forced on an external node by driving transistor devices with appropriate control signals provided by a feedback loop around a highly power efficient class B configuration comprising an operational amplifier having single ended dual outputs and a class B control circuit. Mains power zero crossings may then be detected by monitoring the drive current of devices driven by this amplifier. Wherein Class B control and current mode detection provide accurate detection of the driven signal without depending on any voltage threshold that may depend on temperature, process fabrication and/or supply voltage.

Mains voltage zero-crossing detector

Switching error in an auto-zero offset amplifier is reduced by keeping a clock level to the auto-zero switches at an amplitude just enough to insure complete switching of the switches of the auto-zero offset buffer amplifier. A level shifting circuit provides the clock at the desired level control and a local voltage regulator provides a regulated voltage to the level shifting circuit.

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Ploiesti, Romania

Gabriel Rosca