Power supply circuit utilizing a piezoelectric transformer that

Details Power supply circuit utilizing a piezoelectric transformer that Power supply circuit utilizing a piezoelectric transformer that

1999-12-13

2000-11-21

Riley, Shawn

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363131, 310318, H02M 542, H02M 744, H02M 768

Patent

active

06151232&

ABSTRACT:
Disclosed is a power supply circuit for boosting drive voltage by a booster circuit, inputting the boosted voltage to the primary side of a piezoelectric transformer, and driving a load with an impedance of large temperature dependency by output voltage generated at the secondary side of the piezoelectric transformer. The circuit has: an excessively-small current detection means that outputs excessively-small current signal when load current flowing through the load is smaller than a predetermined value; a stopping means that stops the operation of the booster circuit when the excessively-small current signal is output; and a delaying means that sets a delay time according to the level of the output voltage. The stopping means determines the execution or inexecution of the operation according to the existence of the excessively-small current signal when the delay time passes.

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patent: 5942835 (1999-08-01), Furuhashi et al.
patent: 5969954 (1999-10-01), Zaitsu

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