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BATTERY CHARGING DEVICE

  • US 3,733,534 A
  • Filed: 08/25/1971
  • Issued: 05/15/1973
  • Est. Priority Date: 08/25/1971
  • Status: Expired due to Term
First Claim
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1. In a battery charging device having:

  • a. a transformer for transforming an AC power line supply into usuable energy including an SCR in series with said transformer for charging a battery and a current limiting resistor in series with said SCR and said transformer, said SCR including a control electrode;

    b. a pulsating charging circuit operatively coupled to said transformer, SCR and current limiting resistor and disposed for charging a battery across a charging terminal (18) supplying a pulsating charging current during each half cycle of AC alternation;

    c. a diode (39) connected to said SCR control electrode, a gating transistor (38) including an emitter connected to said diode and, a control transistor (40) with one electrode connected to said gating transistor base;

    d. sensing circuit means connected to said charging terminal for sensing the voltage charged in said battery during the nonchargiNg one-half cycle;

    e. a measurement and memory circuit connected to said charging cirucit and said sensing circuit means including storage means for storing a charge therein which is a function of said battery charge;

    f. a trickle charge circuit in parallel with said SCR, connected to said charging terminal (18), having a diode (50) and resistor (52) in series, g. control means responsive to said voltage sensing means and coupled to said charging circuit for changing the duration of charge upon a predetermined battery voltage for a time period measured by said measurement and memory circuit, the improvement therein comprising;

    h. a second secondary (58), an internal power supply (22) connected to said second secondary (58) including first and second power diodes (60,

         64) in series with said second secondary (58) in parallel with each other in a back-to-back relationship, one of said diodes being connected to the collector electrode of said gating transistor (38) providing half wave rectification to control the firing of said transistor, a tap on said second secondary, a power diode (62) in parallel with power bias resistors (68,

         70) connected to said tap providing rectification of the second half wave, and voltage reference diodes (46, 47, 48,

         49) in series with said power diode (62) said power bias resistors (68,

         70), the emitter of said control transistor (40) being connected to said voltage reference diodes; and

    , i. said sensing circuit means being voltage sensing means and including a resistor bridge (80, 82, 84, 86,

         88) connected to said terminal (18), a voltage sensing transistor (92) operatively coupled to said bridge, an amplifier (A) connected to said bridge, an inverter (B) connected to said amplifier (A) inverting said amplifier output, a second amplifier (F) connected to said power section connected to said inverter (B) supplying charging information thereto, and, a disable means (c) connected to said inverter (B) and second amplifier (F) to disable the charge measuring and terminate the main charge.

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