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High Frequency Power Supply with Line Isolation

IP.com Disclosure Number: IPCOM000076381D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Dobson, DR: AUTHOR

Abstract

This power supply utilizes a frequency dependent high-frequency current source, to eliminate the necessity of incorporating physically large transformers and filter networks.

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High Frequency Power Supply with Line Isolation

This power supply utilizes a frequency dependent high-frequency current source, to eliminate the necessity of incorporating physically large transformers and filter networks.

A low-frequency rectifier and filter 11 provides an output signal having extremely high ripple to the constant-current source 13. Constant-current source 13 supplies an output current whose magnitude decreases as its operating frequency increases. The output current signal from the constant-current source 13 is supplied to current transformer 15, having a high-turns ratio to multiply the input current. The output of current transformer 15 is supplied to high-frequency rectifier and filter 17 which provides a DC output signal. The DC signal is compared with the output signal of a reference-voltage generator 19 by compare amplifier 21. The voltage-controlled oscillator 23 is responsive to the output signal of compare amplifier 21, and provides an output pulse train whose frequency increases as the DC output increases with respect to the reference voltage. The pulse train output is applied to the pulse transformer 25 which provides isolation from the power line. The frequency of the current source 13 is determined by the pulse input and decreases its output current magnitude as the pulse frequency increases.

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