US4316133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated battery charging system with testing for battery back-up system
Assignee: ABB Inc USA
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Filing: 1980-09-05
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Granted: 1982-02-16
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Expires: 2000-09-05
Abstract
Abstract A battery charging circuit for continuously charging a back-up battery is disclosed. A switch conducts a charging current to the battery in response to a temperature variable resistor. The charging current is a function of both the temperature and the battery voltage such that the charging current is matched to the charging characteristics of the battery. Additional features include the establishment of a minimum charging current and the capability of testing the battery under load conditions.
Inventors
- 👤 Philip F. Locke, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:55
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/80; H02J7/82; H02J7/90; H02J7/96; H02J7/971; H02J7/975; H02J7/977
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
201 words
A temperature compensated circuit for charging and testing a back-up battery of an external system, comprising: input terminals adapted for connection to a source of unregulated voltage; output terminals adapted for connection to a load, said output terminals connected to said input terminals; means for regulating the source voltage, said means connected across said input terminals, said means producing a regulated voltage; a test load; first switching means for conducting a charging current, said first switching means said test load and the battery being series connected across said input terminals; a temperature variable resistance, said resistance cooperating with said regulated voltage to produce a control current regulating the conduction of said first switching means; second switching means for electrically grounding said charging current in response to a signal generated by the external system, said second switching means electrically connected in parallel with the series combination of said battery and said test load such that when said charging current is grounded said test load is electrically connected across said battery; and means for reading the battery voltage, said battery connected to said output terminals such that said battery voltage is available at said output terminals in the event said source voltage fails.
Claim 2
Dependent Claim
201 words
A temperature compensated circuit for charging and testing a back-up battery of an external system, comprising: input terminals adapted for connection to a source of unregulated voltage; output terminals adapted for connection to a load, said output terminals connected to said input terminals; means for regulating the source voltage, said means connected across said input terminals, said means producing a regulated voltage; a test load; first switching means for conducting a charging current, said first switching means said test load and the battery being series connected across said input terminals; a temperature variable resistance, said resistance cooperating with said regulated voltage to produce a control current regulating the conduction of said first switching means; second switching means for electrically grounding said charging current in response to a signal generated by the external system, said second switching means electrically connected in parallel with the series combination of said battery and said test load such that when said charging current is grounded said test load is electrically connected across said battery; and means for reading the battery voltage, said battery connected to said output terminals such that said battery voltage is available at said output terminals in the event said source voltage fails.
Claim 3
Dependent Claim
20 words
The circuit of claim 1 wherein the charging current is a function of both the temperature and the battery voltage.
Claim 4
Dependent Claim
28 words
The circuit of claim 1 wherein the means for regulating includes the series combination of a resistor and a zener diode, said zener diode producing the regulated voltage.
Claim 5
Dependent Claim
24 words
The circuit of claim 1 wherein the test load includes a resistor, and including a diode, said diode connected in parallel with said resistor.
Claim 6
Dependent Claim
13 words
The circuit of claim 1 wherein the first switching means includes a transistor.
Claim 7
Dependent Claim
12 words
The circuit of claim 1 wherein the variable resistance includes a thermistor.
Claim 8
Dependent Claim
21 words
The circuit of claim 1 including means cooperating with the variable resistance to produce a constant charging current of minimum value.
Claim 9
Dependent Claim
25 words
The circuit of claim 7 wherein the means cooperating with the variable resistance includes a zener diode electrically connected in parallel with said variable resistance.
Claim 10
Dependent Claim
56 words
The circuit of claim 1 wherein the second switching means includes a transistor having a base terminal responsive to the signal generated by the external system and having a collector terminal connected to the junction of the series connection of the first switching means and the test load and having an emitter terminal connected to ground.
Claim 11
Dependent Claim
12 words
The circuit of claim 1 wherein the battery includes a nickel-cadmium battery.
Claim 12
Dependent Claim
13 words
The circuit of claim 1 wherein the external system includes an event-logging system.
Claim 13
Dependent Claim
38 words
The circuit of claim 1 wherein the means for reading the battery voltage includes a comparator responsive to both the battery voltage and a reference voltage, said comparator producing a battery status signal in response to said comparison.
Claim 14
Dependent Claim
37 words
The circuit of claim 1 wherein the battery has a positive terminal, and including a diode connecting said positive terminal to one of the output terminals such that the battery voltage is available at said output terminals.
Claim 15
Dependent Claim
20 words
The circuit of claim 1 including a zener diode connected across the output terminals for regulating the unregulated source voltage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |