DUAL OSCILLATOR CHARGER-INVERTER CIRCUIT

• US 3,673,485 A
• Filed: 04/20/1971
• Issued: 06/27/1972
• Est. Priority Date: 04/23/1970
• Status: Expired due to Term

• Current Assignee: Jean Orban, Zoltan Vital
• Original Assignee: Jean Orban, Zoltan Vital
• Inventors: Vital, Zoltan, Orban, Jean
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Hickey, Robert J.
• Application Number:
  US05/135,591
• Time in Patent Office: 434 Days
• Field of Search: 320/1,2,5,21,56 321/2,4 307/66,67,18,19,46,108,109 331/49 315/241R,241P,241S
• US Class Current: 320/128
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters

Abstract

In a system for supplying power to a load selectively from a rechargeable battery or from an external power source and for recharging the battery from such power source, a dual converter connectable between the battery, the load and the power source and including components forming a first converter for delivering power from the battery to the load and a second converter for converting the energy from the power source into oscillations and applying such oscillations for recharging the battery, the arrangement being composed of switch means for operatively connecting only one converter at a time, a single transformer core, and a plurality of winding wound on the core, with at least one of the winding being common to both converters.

Claims

1. In a power system including a rechargeable battery constituting the main system power source and a load, a dual power converter for selectively charging the battery from an external a.c. supply or supplying the load from the battery, said converter comprising:

a magnetic transformer core;

a plurality of transformer windings wound on said core;

a first converter circuit including at least one of said windings and comprising an oscillator for producing a signal having a frequency higher than that of the external supply and connectable between the battery and such load for supplying the load;

a second converter circuit including at least two of said windings and constituting an oscillator connectable between such external supply and the battery for producing a signal having a frequency higher than that of the external supply and for applying such signal to charge the battery; and

switch means connected to said circuits for connecting only one said circuit at a time into its operating configuration.

2. An arrangement as defined in claim 1, further comprising current stabilizing means operatively associated with said second converter for rendering the charging current to the battery independent of variations in the frequency and amplitude of the output from the external supply, said stabilizing means including a feedback control device connected between the external supply and the output of said second converter.

3. An arrangement as defined in claim 1, further comprising a charging control circuit connected between said second converter and the battery for terminating the delivery of current to the battery in response to a signal indicating that the battery is near full charge.

4. An arrangement as defined in claim 1 wherein said second converter comprises a disconnect circuit connected in series with said battery for permitting current to flow when the output voltage from said converter has a first polarity and for opening the circuit to the battery when the output from said converteR has the opposite polarity, thereby permitting the no-load voltage of the battery to be measured.

5. An arrangement as defined in claim 1 wherein there are three transformer windings all forming part of each said converter.