1975-07-30
1977-04-12
Beha, Jr., William H.
H02P 1322
Patent
active
040177815
ABSTRACT:
A D.C. to D.C. voltage converter for producing a regulated, adjustable D.C. output voltage from an unregulated D.C. input voltage. An inverter produces alternating rectangular output pulses from the unregulated D.C. input, which are rectified to produce the regulated D.C. output voltage, with the timing and duration of the inverter output pulses being determined by alternating rectangular control pulses produced by a control pulse generator.
The control pulse generator includes an operational amplifier having an inverting input connected to a positive D.C. reference voltage, and a non-inverting input connected to the slide connection of a potentiometer connected between the regulated positive D.C. output voltage and ground. A diode is connected between the amplifier output and ground to block current flow to ground, thus assuring that the amplifier output error signal is essentially always positive, and is only generated when the non-inverting input voltage exceeds the referenced voltage. Another operational amplifier is connected as an inverter to the output of the first amplifier to produce another equal, but negative, error signal. These two signals are combined in a threshold circuit with an alternating triangular wave voltage to produce alternating triangular pulses corresponding to the positive and negative portions of the triangular wave exceeding the positive and negative error signals. The triangular pulses are converted by a pulse shaping circuit into the alternating rectangular pulses which control the inverter switching circuits.
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patent: 3383579 (1968-05-01), Hung
patent: 3816809 (1974-06-01), Kuster
patent: 3859583 (1975-01-01), Reed
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patent: 3938024 (1975-01-01), Clarke
Beha Jr. William H.
Garching Instrumente Gesellschaft zur industriellen Nutzung von
Greigg Edwin E.
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