US3755729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for the charging of batteries
Assignee: Siemens AG
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Filing: 1972-09-25
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Granted: 1973-08-28
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Expires: 1992-09-25
Abstract
Abstract This invention is concerned with a circuit for charging batteries, particularly aircraft batteries, having a rectifier connected on the input side of the battery to a single- or threephase system. The circuit uses a controlled semiconductor element or switch connected into the charging circuit of the battery and in which the control electrode of the semiconductor is connected to the output of a current control device having an on-off characteristic. A first input of the current control device is set at a predetermined threshold value of the charging current while the actual value of the charging current is connected as a second input to the device. As a result, the current control device transmits a switching signal to the control electrode of the semiconductor switch only when the actual value of the charging current is smaller than the predetermined threshold value. Thus an average charging current is self-regulated within the charging circuit. Connected to the first input of the current control device is the output of the voltage control device also having an on-off characteristic. The first input of the voltage control device is set at a predetermined threshold voltage, adjusted to the gassing voltage of the battery, and connected to the second input of the voltage control device is the actual battery voltage, Thus, the voltage control device delivers to the current control device the desired predetermined set value for the charging current only if the actual value of the battery voltage is lower than the predetermined set value of the battery voltage.
Inventors
- 👤 W Kuttner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:43
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/94; H02J7/96; Y; Y10; Y10S; Y10S320/00; Y10S320/17
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
257 words
A cIrcuit for regulating the charging of a battery in which the charging circuit is comprised of a rectifier connected between the input of the battery and a power supply, the regulating circuit comprising the combination of: a switching means, connected to the charging circuit of the battery, a current control device connected to and controlling the switching means, said control device having a first control input whose input signal is a function of a set predetermined threshold value of charging current, and a second control input having as an input a signal which is a function of the actual value of the charging current, the current control device permitting the switching means to permit charging of the battery when the actual value of the charging current is less than the set predetermined threshold value, a voltage control device, whose output is connected to the first input of the current control device, the voltage control device having a first input whose input signal is a function of a predetermined threshold voltage value which is a function of the gassing voltage of the battery, a second input to the voltage control device, having as its input a signal which is a function of the actual battery voltage, the voltage control device delivering an output signal to the first input of the current control device only when the actual value of the battery voltage is less than the predetermined threshold voltage, whereby said battery is charged when its voltage is less than the predetermined gassing voltage of the battery.
Claim 2
Dependent Claim
257 words
A cIrcuit for regulating the charging of a battery in which the charging circuit is comprised of a rectifier connected between the input of the battery and a power supply, the regulating circuit comprising the combination of: a switching means, connected to the charging circuit of the battery, a current control device connected to and controlling the switching means, said control device having a first control input whose input signal is a function of a set predetermined threshold value of charging current, and a second control input having as an input a signal which is a function of the actual value of the charging current, the current control device permitting the switching means to permit charging of the battery when the actual value of the charging current is less than the set predetermined threshold value, a voltage control device, whose output is connected to the first input of the current control device, the voltage control device having a first input whose input signal is a function of a predetermined threshold voltage value which is a function of the gassing voltage of the battery, a second input to the voltage control device, having as its input a signal which is a function of the actual battery voltage, the voltage control device delivering an output signal to the first input of the current control device only when the actual value of the battery voltage is less than the predetermined threshold voltage, whereby said battery is charged when its voltage is less than the predetermined gassing voltage of the battery.
Claim 3
Dependent Claim
35 words
A circuit for regulating the charging of a battery as in claim 1 wherein the switching means comprises a controlled semiconductor element, whose control electrode is connected to the output of the controlled current source.
Claim 4
Dependent Claim
21 words
A circuit for regulating the charging of a battery as in claim 2 wherein the controlled semiconductor is a switching transistor.
Claim 5
Dependent Claim
20 words
A circuit for regulating the charging of a battery as in claim 2 wherein the controlled semiconductor is a thyristor.
Claim 6
Dependent Claim
42 words
A circuit for regulating the charging of a battery as in claim 1 in which the actual charging current applied to the current control device is determined as a function of a voltage drop across a resistor connected within the charging circuit.
Claim 7
Dependent Claim
44 words
A circuit for regulating the charging of a battery as in claim 1 wherein the actual voltage of the battery applied to the second input of the voltage control device is determined as a function of the voltage at the terminals of the battery.
Claim 8
Dependent Claim
31 words
A circuit for regulating the charging of a battery as in claim 1 wherein the value of the gassing voltage is determined as a function of the temperature of the battery.
Claim 9
Dependent Claim
32 words
A circuit for regulating the charging of a battery as in claim 1 wherein the value of the gassing voltage is determined as a function of the temperature of the battery liquid.
Claim 10
Dependent Claim
44 words
A circuit for regulating the charging of a battery as in claim 7 wherein the voltage control device has an input derived as a function of the temperature of the battery to compensate for the temperature dependence of the gassing voltage of the battery.
Claim 11
Dependent Claim
27 words
A circuit for regulating the charging of a battery as in claim 9 wherein the battery temperature is determined by a temperature sensor attached to the battery.
Claim 12
Dependent Claim
20 words
A circuit for regulating the charging of a battery as in claim 10 wherein the temperature sensor is a thermistor.
Claim 13
Dependent Claim
31 words
A circuit for regulating the charging of a battery as in claim 1 wherein the rectifier is an unregulated rectifier in a bridge circuit connected by a transformer to a system.
Claim 14
Dependent Claim
51 words
A circuit for regulating the charging of a battery as in claim 12 wherein the switching means is comprised of a controlled semiconductor switching element having a bypass diode connected to the neutral point of the transformer secondary and to a point between the semiconductor and a pole of the battery.
Claim 15
Dependent Claim
44 words
A circuit for regulating the charging of a battery as in claim 13 wherein the anode of the byPass diode is connected to the neutral point of the transformer secondary and the cathode is connected to the point between the resistor and the semiconductor.
Claim 16
Dependent Claim
33 words
A circuit for regulating the charging of a battery as in claim 12 wherein a smoothing choke is connected within the charging circuit to compensate for sudden current variations within the charging circuit.
References Cited (Backward Citations)
US3387199A
Cited
US3688177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |