EP0673100A1
Expired / Lapsed
EP
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Constant current battery charger with auxiliary supply output for portable apparatus
Assignee: STMicroelectronics SRL
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Filing: 1994-03-03
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Granted: —
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Expires: 2014-03-03
Abstract
Abstract An auxiliary power supply line for powering the functional circuits of a portable apparatus during recharging of its internal battery by a constant current battery charger is derived from a node upstream of a sensing resistance of the current delivered to the battery under charge and is provided with isolation means.
Inventors
- 👤 Giordano Seragnoli
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:39
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/865; H02J9/00; H02J9/04; H02J9/06; H02J9/061
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A constant current, battery charger, capable of separately powering a portable apparatus, comprising a switching-mode voltage regulator circuit, a converter circuit comprising an inductor (L), a capacitor (C), a recirculation diode (D1), an output voltage control loop, and a current stabilization loop for stabilizing the charge current comprising at least a sensing resistance (R1) connected in series between said inductor (L) and an output node of said converter circuit, characterized by comprising an auxiliary power supply output line for powering said portable apparatus during recharge of an internal battery thereof, realized by a line connected to an interconnection node between said sensing resistance (R1) and said inductor (L).
Claim 2
Dependent Claim
31 words
A system as defined in claim 1, wherein said portable apparatus is provided with decoupling means between functional circuits of the apparatus and its internal battery, during recharging of said battery.
Claim 3
Dependent Claim
35 words
A system as defined in claim 2, wherein said decoupling means are a diode (D) functionally connected between a pole of said internal battery of the apparatus and a supply node of said functional circuits.
Claim 4
Dependent Claim
17 words
A system as defined in claim 3, wherein said auxiliary power supply line comprises a decoupling diode.
Claim 5
Dependent Claim
42 words
A system as defined in claim 2, wherein said decoupling means is a mechanical switch capable of interrupting the current path between a terminal of said battery and said power supply node of said functional circuits when said battery is being charged.
Claim 6
Dependent Claim
67 words
In a constant current, battery charger system, capable of simultaneously powering a portable apparatus, the circuit and amunufacturing semplification constituted by deriving an auxiliary power supply line for the functional circuits of the apparatus during recharging of its internal battery through a line connected to a connection node between a sensing resistance of the charge current delivered to the battery and the circuit of the battery charger.
Claim 7
Dependent Claim
66 words
Method of powering a portable apparatus while recharging its internal battery by means of a DC to DC converter comprising a sensing resistance (R1) connected in series with an inductor (L) of the converter and a stabilized output current terminal, characterized by connecting a supply rail of said portable apparatus to be powered to the connection node between said sensing resistance (R1) and said inductor (L).
References Cited (Backward Citations)
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