US3593101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for connecting an electric battery to a source of charging current
Assignee: US Philips Corp
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Filing: 1968-09-05
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Granted: 1971-07-13
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Expires: 1988-09-05
Abstract
Abstract A switching device for interconnecting an electric battery with a DC source of charge current includes a bistable trigger circuit having input terminals connected to the current source and output terminals for connection to a battery to be charged. The trigger circuit is controlled by the battery polarity so that it always assumes the proper state for charging the battery for either of the two possible battery connections.
Inventors
- 👤 Derk Jan Chris Wassink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:31
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/60; H02J7/68; Y; Y10; Y10S; Y10S320/00; Y10S320/15
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
248 words
Apparatus for charging an electric battery comprising, a DC source of charge current, and a switching circuit for interconnecting the current source terminals with the battery terminals and arranged to effectively reverse the terminal connections therebetween in response to an improperly connected battery, said switching circuit comprising, a symmetrical bistable trigger circuit including two semiconductor amplifier elements arranged to conduct during different time intervals, each amplifier element having an output, a control and a common electrode, first and second input terminals connected to the terminals of the current source, first and second impedance elements, means individually connecting the output electrodes to said first and second input terminals via said first and second impedance elements, a pair of coupling resistors connected to cross-couple the output and control electrodes of the amplifier elements, means connecting the common electrodes to said second input terminal, and a pair of output terminals individually connected to the output electrodes and adapted for connection to said battery so that for a given battery polarity at the output terminals one amplifier provides a charge path between current source and battery and the other amplifier provides a battery discharge path, whereas for the reverse battery polarity said other amplifier provides the charge path and said one amplifier provides the discharge path, the state of said trigger circuit being controlled by the polarity of the battery voltage so as to hold the amplifier in the discharge path cutoff and to hold the amplifier in the charge path on.
Claim 2
Dependent Claim
248 words
Apparatus for charging an electric battery comprising, a DC source of charge current, and a switching circuit for interconnecting the current source terminals with the battery terminals and arranged to effectively reverse the terminal connections therebetween in response to an improperly connected battery, said switching circuit comprising, a symmetrical bistable trigger circuit including two semiconductor amplifier elements arranged to conduct during different time intervals, each amplifier element having an output, a control and a common electrode, first and second input terminals connected to the terminals of the current source, first and second impedance elements, means individually connecting the output electrodes to said first and second input terminals via said first and second impedance elements, a pair of coupling resistors connected to cross-couple the output and control electrodes of the amplifier elements, means connecting the common electrodes to said second input terminal, and a pair of output terminals individually connected to the output electrodes and adapted for connection to said battery so that for a given battery polarity at the output terminals one amplifier provides a charge path between current source and battery and the other amplifier provides a battery discharge path, whereas for the reverse battery polarity said other amplifier provides the charge path and said one amplifier provides the discharge path, the state of said trigger circuit being controlled by the polarity of the battery voltage so as to hold the amplifier in the discharge path cutoff and to hold the amplifier in the charge path on.
Claim 3
Dependent Claim
27 words
Apparatus as claimed in claim 1 characterized in that the semiconductor amplifier elements are junction transistors, the emitters of which are connected to the second input terminal.
Claim 4
Dependent Claim
26 words
Apparatus as claimed in claim 1 further comprising first and second diodes connected in the forward direction in series with said first and second impedances, respectively.
Claim 5
Dependent Claim
75 words
Apparatus as claimed in claim 1 characterized in that the first and second impedance elements comprise the main current electrode paths of two further semiconductor amplifier elements connected so that the main current electrode paths of the four semiconductor elements form a symmetrical bridge, a second pair of coupling resistors connected to cross-coupled the output and control electrodes of said two further amplifier elements whereby alternate arms of the bridge are conducting and nonconducting, respectively.
Claim 6
Dependent Claim
41 words
Apparatus as claimed in claim 4 characterized in that the further semiconductor amplifier elements are transistors of a conductivity type which is opposite to that of the first-mentioned transistors and the emitters of which are connected to the first input terminal.
Claim 7
Dependent Claim
25 words
Apparatus as claimed in claim 3 further comprising an adjustable common resistor connected between one of the input terminals and the symmetrical bistable trigger circuit.
Claim 8
Dependent Claim
170 words
A switching device for connecting an electric battery to a DC source of charge current comprising, a bistable trigger said having firSt and second input terminals connected to the terminals of the current source and a pair of output terminals adapted for connection to the battery, said trigger circuit comprising first and second semiconductor amplifier elements each having an output electrode individually connected to an output terminal and a control electrode individually connected to an output terminal with the output and control electrode of each amplifier connected to a different output terminal, means connecting the common electrodes of the amplifier elements to the current source so that the current source exhibits a forward polarity with respect thereto, each of said amplifier elements alternatively providing a charge path and a discharge path for the battery as a function of the battery polarity connections to the output terminals, said trigger circuit being responsive to the battery polarity so as to change state whenever the amplifier element providing the discharge path is conductive.
Claim 9
Dependent Claim
170 words
A switching device for connecting an electric battery to a DC source of charge current comprising, a bistable trigger said having firSt and second input terminals connected to the terminals of the current source and a pair of output terminals adapted for connection to the battery, said trigger circuit comprising first and second semiconductor amplifier elements each having an output electrode individually connected to an output terminal and a control electrode individually connected to an output terminal with the output and control electrode of each amplifier connected to a different output terminal, means connecting the common electrodes of the amplifier elements to the current source so that the current source exhibits a forward polarity with respect thereto, each of said amplifier elements alternatively providing a charge path and a discharge path for the battery as a function of the battery polarity connections to the output terminals, said trigger circuit being responsive to the battery polarity so as to change state whenever the amplifier element providing the discharge path is conductive.
Claim 10
Dependent Claim
29 words
A device as claimed in claim 7 further comprising first and second diodes individually connected in series with said first and second amplifier elements and with the same polarity.
Claim 11
Dependent Claim
68 words
A device as claimed in claim 8 further comprising first and second load impedance elements, means connecting said first impedance element in series with the first diode between the first input terminal and the output electrode of the first amplifier element, and means connecting said second impedance element in series with the second diode between said first input terminal and the output electrode of the second amplifier element.
References Cited (Backward Citations)
US3010031A
Cited
US3483530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |