Inexpensive electronic transformer

Details Inexpensive electronic transformer Inexpensive electronic transformer

H - Electricity

02

M

H02M 7/12 (2006.01) H02M 3/338 (2006.01) H02M 5/44 (2006.01)

Patent

CA 2290907

A Schmitt oscillator driving a pair of switching elements via a high current inverting buffer and the pulse train obtained at the junction of said switching elements is fed in series with a resonant capacitor and the primary of an isolation transformer having a primary and secondary winding and having an appreciable amount of leakage inductance transferred to the primary so as to achieve resonant transitions of the voltage waveforms at the junction of said switching elements. To ensure resonant transitions said isolation transformer is equipped with a gap sufficient to achieve aforesaid mode of operation. The voltage developed on said resonant capacitor is fed to a voltage doubler to produce a DC voltage proportional to the load current, if DC voltage obtained as described is greater that the lower threshold of Schmitt oscillator a timing resistor from the junction of said switching elements will increase the frequency so as to limit the current that can be obtained on the secondary.

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