Patent US3869657A successfully refreshed from Google Patents.
US3869657A
Expired / Lapsed
US
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Quick charging apparatus
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1972-06-22
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Granted: 1975-03-04
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Expires: 1992-06-22
Abstract
Abstract A quick charging circuit for secondary battery comprises an alternating current source, a battery voltage detecting section including a constant voltage source section and two transistors and connected with said alternating current source, a charging current source section for the battery to be charged, and an indicating means for the completion of the charging. The battery is connected only between the common emitters of the two transistors in the battery voltage detecting section and the negative electrode of the constant voltage source section so that the two transistors will be reverse biased and thereby any fluctuation of the battery voltage in the final charging period will be reduced.
Inventors
- 👤 Magozo Shoji
- 👤 Motoharu Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:45
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/02; H02J7/90; H02J7/96; H02J2207/00; H02J2207/20; Y; Y10; Y10S; Y10S320/00; Y10S320/22; Y10S320/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
233 words
A controlled quick charging apparatus comprising a charging current source section for charging a battery to be charged, a detecting section for detecting the charging voltage of the battery to be charged, a current source section for operating said charging current source section and detecting section, and a controlling section for controlling the operation of the charging current source section in response to an output signal of the detecting section, said detecting section comprising a constant voltage device, a series circuit of a regulating resistance and a diode means and connected in parallel with said constant voltage device, a first transistor in which a constant voltage at an intermediate position between said regulating resistance and diode means of the series circuit is applied to the base, and a second transistor connected in the form of a common emitter with the first transistor, and said battery to be charged being inserted so as to be connected on its positive electrode side with the common emitter side of said first and second transistors and on its negative electrode side with the negative electrode side of the constant voltage device and with the negative electrode side of said diode means for reverse biasing said first and second transistors by the battery voltage, said first and second transistors being responsive to a predetermined battery voltage for producing said output signal to which said controlling section is responsive.
Claim 2
Dependent Claim
233 words
A controlled quick charging apparatus comprising a charging current source section for charging a battery to be charged, a detecting section for detecting the charging voltage of the battery to be charged, a current source section for operating said charging current source section and detecting section, and a controlling section for controlling the operation of the charging current source section in response to an output signal of the detecting section, said detecting section comprising a constant voltage device, a series circuit of a regulating resistance and a diode means and connected in parallel with said constant voltage device, a first transistor in which a constant voltage at an intermediate position between said regulating resistance and diode means of the series circuit is applied to the base, and a second transistor connected in the form of a common emitter with the first transistor, and said battery to be charged being inserted so as to be connected on its positive electrode side with the common emitter side of said first and second transistors and on its negative electrode side with the negative electrode side of the constant voltage device and with the negative electrode side of said diode means for reverse biasing said first and second transistors by the battery voltage, said first and second transistors being responsive to a predetermined battery voltage for producing said output signal to which said controlling section is responsive.
Claim 3
Dependent Claim
72 words
A quick charging apparatus according to claim 1 wherein said charging current source section includes a transformer operated with a commercial frequency, the secondary output voltage of said transformer being applied to both ends of a series circuit of the battery to be charged and a semiconductor switch element having a controlling terminal, and the current flowing to the controlling terminal of said semiconductor switch element being controlled with the detecting section.
Claim 4
Dependent Claim
36 words
A quick charging apparatus according to claim 2 wherein a series circuit of a unidirectional constant voltage element and a charging completion indicating lamp is connected to both ends of the secondary winding of the transformer.
Claim 5
Dependent Claim
43 words
A quick charging apparatus according to claim 2 wherein the primary winding and secondary winding of said transformer of the charging current source section is separated for direct current, and said detecting section is operated by the secondary side output of the transformer.
Claim 6
Dependent Claim
89 words
A quick charging apparatus according to claim 1 wherein said charging current source comprises a transformer operated at a commercial frequency and a device for rectifying the secondary output of said transformer, the primary winding of said transformer being applied to both ends of a series circuit of at least the primary winding, a semiconductor switch element having a control terminal and the battery to be charged, and the current flowing to the controlling terminal of said semiconductor switch element being controlled with the output of said detecting section.
Claim 7
Dependent Claim
47 words
A quick charging apparatus according to claim 5 wherein a series circuit of a diode and at least two voltage dividing resistances is inserted in parallel with said semiconductor switch element, and a neon lamp is inserted in parallel with one of said two voltage dividing resistances.
Claim 8
Dependent Claim
51 words
A quick charging apparatus according to claim 1 wherein said detecting section comprises a modified Schmitt trigger circuit, the base terminal voltage of said first transistor is kept constant, and said battery to be charged is connected between the cOmmon emitter and the ground potential of said modified Schmitt trigger circuit.
Claim 9
Dependent Claim
47 words
A quick charging apparatus according to claim 1 wherein a series circuit of a parallel circuit of at least one diode and a resistance and a second resistance is inserted between the base of the first transistor and the negative electrode side of the constant voltage source.
Claim 10
Dependent Claim
47 words
A quick charging apparatus according to claim 1 wherein said charging voltage detecting section includes at least two voltage dividing elements giving a constant voltage to the base of the first transistor, and a theremo-sensitive resistor is inserted into at least one of said voltage dividing elements.
Claim 11
Dependent Claim
37 words
A quick charging apparatus according to claim 1 wherein said constant voltage device comprises a series circuit of a Zener diode and at least one P-N junction diode for compensating the temperature characteristics of said Zener diode.
Claim 12
Dependent Claim
51 words
A quick charging apparatus according to claim 2 wherein a diode is inserted between the negative electrode of said semiconductor switch element and the positive electrode of said battery to be charged in a polarity preventing the discharge of said battery, and a lamp is inserted in parallel with said diode.
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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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |