US3775659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charger
Assignee: Mcculloch Corp
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Filing: 1971-06-09
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Granted: 1973-11-27
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Expires: 1991-06-09
Abstract
Abstract A battery charger for charging batteries that may have a nominal rated voltage equal to or greater than the voltage of the source, includes an accumulator of energy such as an inductor which is coupled across the source through a controllable switch for a first selected interval of time. The charger further includes a path between the accumulator of energy and the battery to be charged for the transfer of the stored energy to the battery. The path between the accumulator and the battery advantageously includes a unilateral impedance element having a recovery time such that a discharge path is provided for the battery during a second selected interval of time substantially less than the first selected interval of time.
Inventors
- 👤 G Carlsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:48
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/927; H02J7/02; H02J7/60; H02J7/80; H02J7/82; H02J2207/00; H02J2207/20; Y; Y10; Y10S; Y10S320/00; Y10S320/22; Y10S320/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
An electrical circuit for charging a battery comprising a blocking diode; an inductor connectible in series with the diode between a voltage source and a battery to be charged, with the diode being connected on the battery side of the circuit and poled to block current flow from the battery into the circuit; a timing capacitor network connected across the inductor through a second blocking diode; an electronic switch having an ON-state and an OFF-state connected to provide when in its ON-state a charge current path therethrough for the capacitor of the timing capacitor network and a current path through the inductor from a source, while bypassing the battery; and a control circuit including the timing capacitor network and the inductor for alternately switching the electronic switch off and on.
Claim 2
Dependent Claim
130 words
An electrical circuit for charging a battery comprising a blocking diode; an inductor connectible in series with the diode between a voltage source and a battery to be charged, with the diode being connected on the battery side of the circuit and poled to block current flow from the battery into the circuit; a timing capacitor network connected across the inductor through a second blocking diode; an electronic switch having an ON-state and an OFF-state connected to provide when in its ON-state a charge current path therethrough for the capacitor of the timing capacitor network and a current path through the inductor from a source, while bypassing the battery; and a control circuit including the timing capacitor network and the inductor for alternately switching the electronic switch off and on.
Claim 3
Dependent Claim
24 words
An electrical circuit in accordance with claim 1 wherein the control circuit switches the electronic switch off upon the capacitor attaining a preselected voltage.
Claim 4
Dependent Claim
25 words
An electrical circuit in accordance with claim 1 wherein the control circuit switches the electronic switch on when the second blocking diode becomes reverse biased.
Claim 5
Dependent Claim
226 words
Apparatus for charging a battery from a source comprising an NPN transistor, a PNP transistor, an inductor connected in series with the collector emitter path of the NPN transistor between the positive and negative terminal of the source, the inductor being connected between the collector of the NPN transistor and the positive terminal of the source, a first resistor connected between the collector of the PNP transistor and the base of the NPN transistor, means for connecting the emitter of the PNP transistor to the positive terminal of the source, a second resistor connected between the base of the NPN transistor and the negative terminal of the source, a voltage divider of a third and fourth resistor connected between the positive and negative terminals of the source, the base of the PNP transistor being connected to the junction of the third and fourth resistor, a fifth resistor and a capacitor connected in series between the base of the PNP transistor and the collector of the NPN transistor, a first diode connected between the collector of the NPN transistor and the positive terminal of the battery to be charged, a second diode connected between the base of the PNP transistor and the positive terminal of the source and means for connecting the negative terminal of thE battery to be charged to the negative terminal of the source.
Claim 6
Dependent Claim
226 words
Apparatus for charging a battery from a source comprising an NPN transistor, a PNP transistor, an inductor connected in series with the collector emitter path of the NPN transistor between the positive and negative terminal of the source, the inductor being connected between the collector of the NPN transistor and the positive terminal of the source, a first resistor connected between the collector of the PNP transistor and the base of the NPN transistor, means for connecting the emitter of the PNP transistor to the positive terminal of the source, a second resistor connected between the base of the NPN transistor and the negative terminal of the source, a voltage divider of a third and fourth resistor connected between the positive and negative terminals of the source, the base of the PNP transistor being connected to the junction of the third and fourth resistor, a fifth resistor and a capacitor connected in series between the base of the PNP transistor and the collector of the NPN transistor, a first diode connected between the collector of the NPN transistor and the positive terminal of the battery to be charged, a second diode connected between the base of the PNP transistor and the positive terminal of the source and means for connecting the negative terminal of thE battery to be charged to the negative terminal of the source.
Claim 7
Dependent Claim
157 words
Apparatus in accordance with claim 4 further including a second PNP transistor having its emitter connected to the positive terminal of the source and its collector connected to the base of the first PNP transistor, a sixth resistor connected between the base of the second PNP transistor and the positive terminal of the source, a silicon controlled rectifier, a seventh resistor, the anode of the rectifier being connected to the base of the second PNP transistor through the seventh resistor, an eighth resistor being connected between the cathode of the rectifier and the negative terminal of the source, a Zener diode and a potentiometer connected in series between the positive and negative terminals of the battery to be charged, a ninth resistor being connected between the gate electrode of the rectifier and the movable arm of the potentiometer and a capacitor being connected between the gate electrode of the rectifier and the negative terminal of the source.
Claim 8
Dependent Claim
47 words
Apparatus in accordance with claim 5 further including a tenth resistor and an eleventh resistor connected in series between the positive and negative terminal of the source and a third diode connected between the junction of the tenth and eleventh resistors and the cathode of the rectifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |