Patent EP0654911A2 successfully refreshed from Google Patents.
EP0654911A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Switch-mode power supply for time division multiple access radio phone systems
Assignee: Nokia Oyj
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Filing: 1994-11-18
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Granted: —
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Expires: 2014-11-18
Abstract
Abstract The present invention relates to a circuit for use in Time Division Multiple Access radio phone systems for implementing a keyed power supply of switch-type. The operation of the switch-mode power supply (2) is keyed to take place outside the reception cycles and transmission cycles of the signal.
Inventors
- 👤 Erkka Sointula
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 02:24
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/56
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
A circuit for use in Time Division Multiple Access radio phone systems to produce the operating voltage, comprising - a power source (1), - a switch-mode power supply (2) - a capacitor (3), for storing energy provided by the power source, characterized in that means is provided (4) for controlling operation of the switch-mode power supply (2) such that it is keyed to operate outside the reception cycles and/or transmission cycles of the signal.
Claim 2
Dependent Claim
30 words
A circuit according to claim 1, characterized in that the keying of the operation of a switch-mode power supply (2) is synchronized with the aid of a TDMA frame pulse.
Claim 3
Dependent Claim
26 words
A circuit according to claim 1 or 2, characterized in that the storage capacitor (3) is positioned as close to the point of consumption as possible.
Claim 4
Dependent Claim
29 words
A circuit according to any preceding claim, characterized in that the circuit has been implemented with the aid of small-size electrolyte capacitors of high capacity and low internal resistance.
Claim 5
Dependent Claim
81 words
A circuit for a radio telephone operable in a time division multiple access system in which respective time slots are allocated for transmission and reception, the circuit comprising a power source regulated by a switch-mode power supply providing peak voltages during operating periods for charging a storage capacitor to a desired power level, and means for controlling operation of the switch-mode power supply such that the switch-mode power supply operates only during periods outside the transmission and/or reception time slots allocated.
References Cited (Backward Citations)
No citation records indexed.
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