EP0161109A2
Expired / Lapsed
EP
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Battery charger
Assignee: Newton Derby Ltd
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Filing: 1985-05-07
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Granted: —
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Expires: 2005-05-07
Abstract
Abstract There is disclosed a battery charger for supplying a rectified a.c. voltage to a battery to be charged, said voltage being fed to the battery through a semi-conductor switch which is, in turn, controlled by a control signal representative of the state of charge of the battery.
Inventors
- 👤 David Ronald Gibson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:27
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A battery charger comprising means for supplying a rectified a.c. voltage to a battery to be charged, means for generating a control signal representative of the state of charge of the battery, said control signal controlling the conduction of a semi-conductor switch through which said rectified a.c. voltage is fed to the battery.
Claim 2
Dependent Claim
53 words
A battery charger comprising means for supplying a rectified a.c. voltage to a battery to be charged, means for generating a control signal representative of the state of charge of the battery, said control signal controlling the conduction of a semi-conductor switch through which said rectified a.c. voltage is fed to the battery.
Claim 3
Dependent Claim
27 words
A battery charger as claimed in claim 1, wherein said means for generating a control signal includes a zero crossing detector circuit and a logic control circuit.
Claim 4
Dependent Claim
43 words
A battery charger as claimed in claim 2, wherein said zero crossing detector circuit includes an amplifier to the non-inverting input of which there is applied a reference voltage and to the inverting input of which there is applied said rectified a.c. voltage.
Claim 5
Dependent Claim
29 words
A battery charger as claimed in either claim 2 or claim 3, wherein said logic control circuit receives an input representative of the state of charge of the battery.
Claim 6
Dependent Claim
25 words
A battery charger as claimed in claim 4, wherein said input representative of the state of charge of the battery is the battery terminal voltage.
Claim 7
Dependent Claim
27 words
A battery charger as claimed any preceding claim, wherein there is included a current limiting circuit for inhibiting said control signal on occurrence of a fault condition.
Claim 8
Dependent Claim
16 words
A battery charger as claimed in claim 6, wherein said fault condition is excessive charging current.
Claim 9
Dependent Claim
28 words
8 . A battery charger as claimed in claim 6, wherein said fault condition is excessive heating of a transformer forming part of the a.c. voltage supply means.
Claim 10
Independent Claim
47 words
A method of charging a battery comprising the steps of feeding a rectified a.c. voltage to the battery through a semi-conductor switch, generating a control signal representative of the state of charge of the battery, and controlling the conduction of said semi-conductor switch using said control signal.
Claim 11
Independent Claim
47 words
A method of charging a battery comprising the steps of feeding a rectified a.c. voltage to the battery through a semi-conductor switch, generating a control signal representative of the state of charge of the battery, and controlling the conduction of said semi-conductor switch using said control signal.
Claim 12
Dependent Claim
43 words
A method as claimed in claim 9, wherein said control signal is generated by comparing a signal representative of the terminal voltage of the battery with a reference voltage, said battery terminal voltage being measured during a zero-crossing of the charging a.c. voltage.
References Cited (Backward Citations)
No citation records indexed.
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