DIRECT CURRENT POWER SUPPLY FOR ELECTRICAL APPLIANCES

• US 3,790,810 A
• Filed: 06/30/1972
• Issued: 02/05/1974
• Est. Priority Date: 06/30/1972
• Status: Expired due to Term

• Current Assignee: David Berend, Fred A. Rogers
• Original Assignee: David Berend, Fred A. Rogers
• Inventors: Rogers, Fred A., Berend, David
• Primary Examiner(s): Pellinen, A. D.
• Application Number:
  US05/268,098
• Time in Patent Office: 585 Days
• Field of Search: 307/23,26,38,64,66,75,85 310/50 320/2,4 321/8R 318/139
• US Class Current: 307/66
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y10S 320/11 Prioritized supply of power or power supply compensation

Abstract

An arrangement in which a center-tapped transformer supplies power for operating a DC motor, as well as charging a battery. Alternating current from the secondary winding of the transformer is rectified through one diode mounted within the transformer unit, and a second diode mounted within the unit carrying the motor. The transformer unit is connected with a three wire plug to the load means, for example, a motor or appliance unit. When the transformer unit is not connected to the applicance unit, the battery operates the motor.

Claims

1. A power supply arrangement, comprising in combination, transformer means with primary winding connected to a supply of alternating current and secondary winding having a center tap;

first rectifying means connected to one terminal of said secondary winding;

switch means connected to said secondary winding and said center tap;

load means connected by said switch means to said secondary winding in a first operating state, said switch means disconnecting said load from said secondary winding in a second operating state;

battery means connected to said switch means for being charged by power from said secondary winding and through said first rectifying means when said switch means is in said second operating state, said battery means being charged with half-wave rectified alternating current; and

second rectifying means connected between said switch means and said secondary winding for applying full-wave rectified alternating current to said load means in said first operating state, said load means receiving full-wave rectified current through said first and second rectifying means and said battery means being connected to half of said secondary through said switch means in said first operating state, said battery means being connected across both halves of said secondary winding when charged with half-wave rectified alternating current in said second operating state.

2. The arrangement as defined in claim 1, wherein said first rectifying means and said second rectifying means comprise diode means.

3. The arrangement as defined in claim 1, including connector means between said switch means and said secondary winding, said first rectifying means being connected in series with one terminal of said secondary winding.

4. The arrangement as defined in claim 3, wherein said second rectifying means is connected between said connector means and said switch means.

5. The arrangement as defined in claim 3, wherein said connector means comprises a three-pin connector.

6. The arrangement as defined in claim 3, wherein said battery means is connected across said load means in said first operating state when said connector means is disengaged.

7. The arrangement as defined in claim 1, including resistor means connected in series with said battery means for limiting the charging current to said battery means.

8. The arrangement as defined in claim 1, wherein said battery means comprises a nickel-cadmium rechargeable battery.

9. The arrangement as defined in claim 1, wherein said battery means is charged with a voltage comprising substantially twice the nominal voltage of said battery means.

10. The arrangement as defined in claim 1 wherein said battery means is connected in parallel with said load means in said first operating state, said battery means maintaining substantially constant the voltage across said load means upon fluctuations in voltage of said supply of alternating current.

11. The arrangement as defined in claim 1 wherein said battery means is connected in parallel with said load means in said first operating state, the charge of said battery means being deficient when a decrease in voltage of said supply of alternating current incurs a decrease in power supplied to said load means.

12. A power supply arrangement comprising, in combination, transformer means with primary winding connected to a supply of alternating current and secondary winding having a center tap;

first rectifying means connected to one terminal of said secondary winding;

double-pole, double-throw switch means connected to said secondary winding and said center tap;

load means connected by said double-pole, double-throw switch means to said secondary winding in a first operating state, said switch means disconnecting said load means from said secondary winding in a second operating state;

battery means connected to said switch means for being charged by power from said secondary winding and through said first rectifying means when said switch means is In said second operating state, said battery means being charged with half-wave rectified alternating current; and

second rectifying means connected between said switch means and said secondary winding for applying full-wave rectified alternating current to said load means in said first operating state.