Universal battery charger

• US 3,105,183 A
• Filed: 08/29/1962
• Issued: 09/24/1963
• Est. Priority Date: 08/29/1962
• Status: Expired due to Term

• Current Assignee: John F. Hysler, Raymond H. Legatti
• Original Assignee: John F. Hysler, Raymond H. Legatti
• Inventors: Hysler, John F., Legatti, Raymond H.
• Application Number:
  US04/220,268
• Time in Patent Office: 391 Days
• US Class Current: 320/138
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02J 7/12 using magnetic devices having controllable degree of saturation, i.e. transductors
• CPC Class Codes: Y10S 320/11 Prioritized supply of power or power supply compensation
• CPC Class Codes: Y10S 320/15 Polarity control
• CPC Class Codes: Y10S 320/24 Inductor

Claims

2. A BATTERY CHARGER COMPRISING, IN COMBINATION, A POTENTIAL TRANSFORMER HAVING A PRIMARY WINDING AND SECONDARY WINDING MEANS;

MEANS OPERABLE TO CONNECT SAID PRIMARY WINDING TO A SOURCE OF A.C. POTENTIAL;

A MAGNETIC AMPLIFIER HAVING POWER COILS AND CONTROL COILS;

A POLARIZED BATTERY CONNECTOR;

CIRCUIT MEANS, INCLUDING RECTIFIER MEANS, CONNECTING SAID POWER COILS IN A CHARGING CIRCUIT CONNECTING SAID SECONDARY WINDING MEANS TO SAID BATTERY CONNECTOR FOR FLOW OF D.C. CHARGING CURRENT TO SAID BATTERY CONNECTOR;

A D.C. POWER SUPPLY ENERGIZED FROM SAID TRANSFORMER;

A TRANSISTOR OPERABLE TO CONTROL THE FLOW OF D.C. CURRENT FROM SAID D.C. POWER SUPPLY TO SAID CONTROL COILS;

A CURRENT TRANSFORMER CONNECTED IN THE CHARGING CURRENT CIRCUIT;

MEANS CONNECTED TO THE SECONDARY WINDING OF SAID CURRENT TRANSFORMER AND OPERABLE TO DERIVE, FROM THE POTENTIAL ACROSS SAID SECONDARY WINDING, A CONTROL POTENTIAL PROPORTIONAL TO THE CHARGING CURRENT;

CHARGING CURRENT SELECTOR MEANS OPERABLE TO ADJUST SAID CONTROL POTENTIAL TO A VALUE CORRESPONDING TO A PRESELECTED LIMITING CHARGING CURRENT RATE;

MEANS OPERABLE TO APPLY THE PORTION OF THE CONTROL POTENTIAL IN EXCESS OF A SUBSTANTIALLY CONSTANT POTENTIAL TO SAID TRANSISTOR TO CONTROL THE BIAS OF THE LATTER IN ACCORDANCE WITH THE DIFFERENTIAL BETWEEN THE ACTUAL CHARGING CURRENT RATE AND THE PRE-SET LIMITING RATE;

BATTERY TERMINAL VOLTAGE PRESELECTING MEANS;

VOLTAGE-RESPONSIVE CONTROL MEANS OPERATIVELY CONNECTED TO SAID PRESELECTING MEANS, SAID TRANSISTOR AND SAID D.C. POWER SOURCE AND EFFECTIVE, WHEN THE CHARGING CURRENT IS REDUCED, DUE TO THE BATTERY VOLTAGE APPROACHING THE PRESET TERMINAL VALUE, TO A VALUE SUCH THAT SAID CONTROL POTENTIAL IS LESS THAN SAID SUBSTANTIALLY CONSTANT POTENTIAL, TO CONTROL THE BIAS OF SAID TRANSISTOR IN ACCORDANCE WITH THE BATTERY VOLTAGE;

SAID CONTROL POTENTIAL DERIVING MEANS INCLUDING A FULL WAVE RECTIFIER CONNECTED ACROSS SAID CURRENT TRANSFORMER SECONDARY WINDING;

A ZENER DIODE AND A RESISTOR CONNECTED IN SERIES BETWEEN OPPOSITE TERMINALS OF SAID RECTIFIER, WHEREBY ANY POTENTIAL BETWEEN SAID OPPOSITE TERMINALS AND IN EXCESS OF THE VOLTAGE RATING OF SAID ZENER DIODE WILL APPEAR ACROSS SAID RESISTOR CONSTITUTING SAID TRANSISTOR BIASING MEANS;

SAID CHARGING CURRENT SELECTING MEANS INCLUDING MEANS SELECTIVELY OPERABLE TO PRE-SET THE VOLTAGE DROP APPLIED FROM SAID CURRENT TRANSFORMER SECONDARY WINDING TO SAID FULL WAVE RECTIFIER;

SAID MAGNETIC AMPLIFIER POWER COILS BEING NORMALLY BIASED TO CONDUCTIVITY AND HAVING THEIR CONDUCTIVITY MODULATED INVERSELY IN ACCORDANCE WITH THE FLOW OF DIRECT CURRENT THROUGH SAID CONTROL COILS;

SAID VOLTAGE-RESPONSIVE CONTROL MEANS BEING OPERABLE TO NORMALLY RENDER SAID TRANSISTOR NONCONDUCTIVE, AND BEING OVERRIDDEN BY THE POTENTIAL ACROSS SAID RESISTOR AS APPLIED TO THE BASE OF SAID TRANSISTOR WHEN THE CHARGING CURRENT EXCEEDS SUCH PRESELECTED LIMITING VALUE.