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Browse Prior Art Database

Wide Range Uniformly High Efficiency DC/DC Converter

IP.com Disclosure Number: IPCOM000077819D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Singleton, WC: AUTHOR

Abstract

The DC-to-DC converter of Fig. 1, independently controls the pulse width and pulse frequency of a self-generated pulse train, to provide uniformly efficient conversion of an unregulated DC power source voltage into a plurality of isolated regulated voltage sources. Input power is received at line 12 which is connected through primary winding 14 to switching transistor 20. Transistor 20 is controlled by Schmidt trigger 22, which is in turn controlled by the voltage VC on capacitor 24. When Schmidt trigger 22 is ON, capacitor 24 is charged from line 12 through switching transistor 26 and resistor 28, and energy is stored in core 36 at a rate proportional to the voltage on line 12. When the voltage VC on capacitor turning transistors 20 and 26 OFF and transistor 32 ON.

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Wide Range Uniformly High Efficiency DC/DC Converter

The DC-to-DC converter of Fig. 1, independently controls the pulse width and pulse frequency of a self-generated pulse train, to provide uniformly efficient conversion of an unregulated DC power source voltage into a plurality of isolated regulated voltage sources. Input power is received at line 12 which is connected through primary winding 14 to switching transistor 20. Transistor 20 is controlled by Schmidt trigger 22, which is in turn controlled by the voltage VC on capacitor
24. When Schmidt trigger 22 is ON, capacitor 24 is charged from line 12 through switching transistor 26 and resistor 28, and energy is stored in core 36 at a rate proportional to the voltage on line 12. When the voltage VC on capacitor turning transistors 20 and 26 OFF and transistor 32 ON. Transistor 32 discharges capacitor 24 through optical current source 30. Optical current source 30 is driven by light from error amplifier 34. The light output of amplifier 34 is directly proportional to the difference between the average DC voltage on line 18 and the reference voltage on line 16.

Each isolated voltage source comprises a winding 42 on magnetic core 36 wound in opposite polarity to winding 14, an isolating diode 44, and a filter capacitor 46. The converter operates at uniform efficiency by controlling the width of current pulses 11 inversely proportional to the source voltage on line 12, thereby storing uniform amounts of energy in c...