Regulated DC power supply
First Claim
1. A power supply for supplying DC voltages of opposite polarity, comprising:
- a DC voltage source having a first terminal at which a first DC voltage is provided and a second terminal connected to a common line;
first voltage stabilizing means connected between said first terminal of said voltage source and a first power-source, voltage-supply output terminal for stabilizing said first DC voltage at said first output terminal;
polarity converting means connected to said first teriminal of said voltage source and to said common line and including a switching means controlled by a pulse-width modulation signal generator for supplying at an output terminal a second DC voltage of substantially the same absolute value and of opposite polarity as said first DC voltage; and
second voltage stabilizing means connected between said output terminal of said polarity converting means and a second power-source, voltage-supply output terminal for stabilizing said second DC voltage at said second output terminal, whereby positive and negative DC voltages of substantially equal absolute value and of opposite polarity are respectively provided between said first and second power-source, voltage-supply output terminals and said common line.
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Accused Products
Abstract
A power supply circuit for supplying stabilized positive and negative DC voltages of opposite polarity but equal magnitude requires only a single voltage source that supplies a first DC voltage, and a polarity converting circuit connected to the voltage source provides a second DC voltage equal in magnitude but opposite in polarity to the first DC voltage. First and second voltage stabilizing circuits are connected to the voltage source and the polarity converting circuit, respectively, to provide between respective output terminals and a common ground line the equal level but opposite polarity voltages. Voltage stabilization is provided in the stabilizing circuits by the use of Zener diode circuits to provide biasing to control the collector-emitter paths of respective transistors, and polarity conversion is accomplished by a switching transistor controlled by a pulse-width modulation signal generator having its input derived from a level comparison circuit.
22 Citations
18 Claims
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1. A power supply for supplying DC voltages of opposite polarity, comprising:
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a DC voltage source having a first terminal at which a first DC voltage is provided and a second terminal connected to a common line; first voltage stabilizing means connected between said first terminal of said voltage source and a first power-source, voltage-supply output terminal for stabilizing said first DC voltage at said first output terminal; polarity converting means connected to said first teriminal of said voltage source and to said common line and including a switching means controlled by a pulse-width modulation signal generator for supplying at an output terminal a second DC voltage of substantially the same absolute value and of opposite polarity as said first DC voltage; and second voltage stabilizing means connected between said output terminal of said polarity converting means and a second power-source, voltage-supply output terminal for stabilizing said second DC voltage at said second output terminal, whereby positive and negative DC voltages of substantially equal absolute value and of opposite polarity are respectively provided between said first and second power-source, voltage-supply output terminals and said common line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A stabilized power supply comprising:
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a DC voltage source having a first terminal at which a first DC voltage of first polarity is produced and a second terminal connected to a common ground; polarity converting means having a first input connected to said first terminal of said voltage source and a second input connected to said common ground including a switching means controlled by an output of a pulse-width modulation means for producing at an output terminal a second DC voltage equal in absolute value to said first DC voltage and having an opposite polarity; and voltage stabilizer means connected to said first terminal of said DC voltage source, to said output terminal of said polarity converting means, and to said common ground for producing between a first power-source, output terminal and said common ground and a second power-source, output terminal and said common ground stabilized DC voltages of equal absolute value and of opposite polarity, respectively, - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification