Causal sampling circuit for measuring reflected voltage and...

Details Causal sampling circuit for measuring reflected voltage and... Causal sampling circuit for measuring reflected voltage and...

2008-03-25

2008-03-25

Laxton, Gary L. (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C323S909000, C323S909000, C323S909000

Reexamination Certificate

active

11613884

ABSTRACT:
A causal sampling circuit is developed to measure a reflected voltage and demagnetizing time of the transformer. It includes a signal-generation circuit to generate a sample signal for sampling the reflected voltage of the transformer. A ramp signal of the sampling circuit is generated in response to the demagnetizing of the transformer. A first reference signal is generated in accordance with the magnitude of the ramp signal after the transformer is fully demagnetized. A second reference signal is generated in response to the ramp signal and a bias signal. The sample signal is enabled in response to the demagnetizing of the transformer. The sample signal is disabled once the second reference signal is higher than the first reference signal. A sample-and-hold circuit is coupled to the transformer to sample the reflected voltage of the transformer in response to the sample signal.

REFERENCES:
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patent: 6853563 (2005-02-01), Yang et al.
patent: 6862194 (2005-03-01), Yang et al.
patent: 7016204 (2006-03-01), Yang et al.
patent: 7057907 (2006-06-01), Oh
patent: 2007/0103943 (2007-05-01), Mangtani et al.
patent: 2007/0133234 (2007-06-01), Huynh et al.

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