High voltage offset detection circuit and method

Details High voltage offset detection circuit and method High voltage offset detection circuit and method

2006-05-23

2006-05-23

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S2090SC, C361S090000, C361S091100, C363S021030, C363S021010

Reexamination Certificate

active

07049767

ABSTRACT:
A high voltage offset detection circuit registers the voltage at the midpoint of a switching half-bridge to determine when the midpoint voltage reaches a given value to avoid hard-switching in the half-bridge switches. The midpoint voltage of the switching half-bridge is applied through a buffer to a MOSFET that is current limited to produce a voltage that reflects the voltage of the midpoint of the switching half-bridge. The voltage produced by the MOSFET may be supplied to a comparator with a threshold input to obtain a signal that indicates when the switches of the switching half-bridge may be turned on to avoid hard-switching. The MOSFET may be selectively enabled to detect the voltage. The buffer operates to prevent voltages being applied to the MOSFET lower than a low side return voltage to prevent shorts in the IC between the low side supply voltage and low side return. The offset detection circuit may be completely implemented on a monolithic integrated circuit with a switching half-bridge driver, or may be a separate circuit coupled to the half-bridge and external to the half-bridge driver.

REFERENCES:
patent: 5757173 (1998-05-01), Agiman
patent: 6614288 (2003-09-01), Dagan et al.

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