Voltage supply circuit responsive to plural possible DC input levels
First Claim
1. A voltage supply circuit comprising:
- input means for receiving a DC input voltage having one of plural possible levels;
Dc-ac inverter means for inverting said DC input voltage including a boosting transformer having at least one winding with end terminals and an intermediate terminal, and inverter drive means for providing a pulsed current to said transformer;
means connecting said input means to said intermediate terminal for applying said DC voltage to said transformer at said intermediate terminal; and
control circuit means for controlling said inverter drive means and which alterlatively selects between a first condition in which said inverter drive means is made operative and a boosted voltage is provided at one end terminal of said boosting transformer, and a second condition in which said inverter drive means is made inoperative so that said DC input voltage is provided at said end terminal, said control circuit means including level-detecting means for detecting the level of said DC input voltage and switching means selecting between said first and second conditions on the basis of the level of said DC input voltage detected by said level detecting means.
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Accused Products
Abstract
A voltage supply circuit comprises an input for receiving a DC input voltage having one of plural possible levels; a DC-AC inverter for inverting the DC input voltage and which includes a boosting transformer having a winding with end terminals and an intermediate terminal and an inverter drive circuit for providing an AC current to the transformer; a connection between the input and the intermediate terminal of the boosting transformer for applying the DC input voltage to the latter; and a control circuit for controlling the inverter drive circuit, and which selects between a first condition, in which the inverter drive circuit is made operative so that a boosted voltage is provided at one end terminal of the boosting transformer, and a second condition, in which the inverter drive circuit is made inoperative, so that the DC input voltage introduced at the intermediate terminal is provided as a DC output voltage at the end terminal of the booster transformer. The control circuit can include a zener diode as a level detector to control a switching transistor so that the first and second conditions are selected on the basis of the level of the DC input voltage.
19 Citations
10 Claims
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1. A voltage supply circuit comprising:
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input means for receiving a DC input voltage having one of plural possible levels; Dc-ac inverter means for inverting said DC input voltage including a boosting transformer having at least one winding with end terminals and an intermediate terminal, and inverter drive means for providing a pulsed current to said transformer; means connecting said input means to said intermediate terminal for applying said DC voltage to said transformer at said intermediate terminal; and control circuit means for controlling said inverter drive means and which alterlatively selects between a first condition in which said inverter drive means is made operative and a boosted voltage is provided at one end terminal of said boosting transformer, and a second condition in which said inverter drive means is made inoperative so that said DC input voltage is provided at said end terminal, said control circuit means including level-detecting means for detecting the level of said DC input voltage and switching means selecting between said first and second conditions on the basis of the level of said DC input voltage detected by said level detecting means. - View Dependent Claims (2, 3, 4)
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5. A voltage supply circuit comprising:
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input means for receiving a DC input voltage having one of plural possible levels; Dc-ac inverter means for inverting said DC input voltage including a boosting transformer having at least one winding with end terminals and an intermediate terminal, and inverter drive means for providing a pulsed current to said transformer, said inverter drive means including oscillator means providing an AC switching signal and switching means controlling the current to said boosting transformer in response to said AC switching signal when said control circuit selects said first condition; means connecting said input means to said intermediate terminal for applying said DC voltage to said transformer at said intermediate terminal; and control circuit means for controlling said inverter drive means and which alternatively selects between a first condition in which said inverter drive means is made operative and a boosted voltage is provided at one end terminal of said boosting transformer, and a second condition in which said inverter drive means is made inoperative so that said DC input voltage is provided at said end terminal. - View Dependent Claims (6, 7, 8, 9)
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10. A voltage supply circuit comprising
input means for receiving a DC input voltage having one of plural possible levels; -
Dc-ac inverter means for inverting said DC input voltage including a boosting transformer having at least one winding with end terminals and an intermediate terminal, and inverter drive means for providing a pulsed current to said transformer; means connecting said input means to said intermediate terminal for applying said DC voltage to said transformer at said intermediate terminal; and control circuit means for controlling said inverter drive means and which alternatively selects between a first condition in which said inverter drive means is made operative and a boosted voltage is provided at one end terminal of said boosting transformer, and a second condition in which said inverter drive means is made inoperative so that said DC input voltage is provided at said end terminal; and
in which said inverter drive means includes switching means and a capacitor, said switching means being connected in series with said boosting transformer and said capacitor being connected in parallel with said switching means, said switching means being enabled to switch between ON and OFF states when said control circuit means selects said first condition.
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Specification