Patent EP0613257A2 successfully refreshed from Google Patents.
EP0613257A2
Expired / Lapsed
EP
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Power circuit and radiocommunication apparatus using the power circuit
Assignee: Sony Corp
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Filing: 1994-02-24
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Granted: —
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Expires: 2014-02-24
Abstract
Abstract The apparatus operates on a time division multiplex communication system and includes a power amplifier circuit (12), signal processing circuit (11, 15), battery (20), stepping up circuit (23), storing circuit (24), and a switch circuit (21). The power amplifier circuit amplifies a transmitted signal intermittently transmitted at predetermined periods to a radio transmission power level. The signal processing circuit is operated by a voltage lower than the operating voltage of the power amplifier circuit. The battery is for example a battery constituted of a lithium ion battery, of which the unit cell has a full-charged voltage lower than the operating voltage of the power amplifier circuit and an ultimate voltage higher than the operating voltage of the signal processing circuit, with a large voltage difference between the full-charged voltage and the ultimate voltage. The stepping up circuit is a circuit with small output current capacity, operating at the voltage within the range changing from the full-charged voltage to the ultimate voltage of the battery, and amplifies the output voltage of the battery at least to the operating voltage of the power amplifier circuit. The storing circuit stores power of which the voltage is stepped up by the stepping up circuit. The switch circuit is provided between the storing circuit and the power-supply terminal of the power amplifier circuit and supplies the stored power in the storing circuit to the power amplifier circuit only while the power amplifier circuit is amplifying the transmitted signal in substance.
Inventors
- 👤 Norio Shimo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 10:52
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H02; H02J; H02J2207/00; H02J2207/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
A power circuit for supplying power from the same battery to a first circuit (11, 15) operated by a low voltage and a second circuit (12) intermittently operated by a higher voltage than said first circuit comprising: a battery (20) of which the unit cell has a full-charged voltage lower than the operating voltage of said second circuit and an ultimate voltage higher than the operating voltage of said first circuit; a stepping up and storing circuit (23, 24) for stepping up the voltage of said battery, changing within the range between the full-charged voltage and the ultimate voltage, to the operating voltage of said second circuit and storing the stepped up power; and power supply control means (21) for supplying the power stored in said stepping up and storing circuit to said second circuit only while said second circuit (12) is operating in substance.
Claim 2
Dependent Claim
74 words
A power circuit according to claim 1, wherein said power supply control means has a first switch circuit (21) connected between said second circuit (12) and said stepping up and storing circuit (23, 24) and is set to switch on only while said second circuit (12) is operating in substance and a control circuit (30) for controlling said first switch circuit to turn on only while said second circuit is in an operating state.
Claim 3
Dependent Claim
66 words
A power circuit according to claim 2, wherein said stepping up and storing circuit has a DC/DC converter (23) operating at an input voltage within the range between the full-charged voltage and the ultimate voltage of said battery (20) and stepping up the input voltage to a voltage higher than the operating voltage of said second circuit and a capacitor (24) charged by said DC/DC converter.
Claim 4
Dependent Claim
53 words
A power circuit according to claim 2, wherein said power circuit further comprises a second switch circuit (26) connected between said battery (20) and said stepping up and storing circuit (23, 24), said second switch circuit being turned on by said control circuit (30), while said second circuit is in an operating state.
Claim 5
Dependent Claim
16 words
A power circuit according to claim 1, wherein said battery (20) is a lithium ion battery.
Claim 6
Dependent Claim
206 words
A radiocommunication apparatus (11) operable on a time division multiplex communication system comprising: a power amplifier circuit (12) for amplifying a transmitted signal intermittently transmitted at predetermined periods to a radio transmission power level; a signal processing circuit (11, 15) operating at a voltage lower than the operating voltage of said power amplifier circuit; a battery (20) of which the unit cell has a full-charged voltage lower than the operating voltage of said power amplifier circuit and an ultimate voltage higher than the operating voltage of said signal processing circuit, with a large voltage difference between the full-charged voltage and the ultimate voltage; a stepping up circuit (23) with a small output current capacity for stepping up the output voltage of said battery, changing within the range between the full-charged voltage and the ultimate voltage, at least to the operating voltage of said power amplifier circuit; a storing circuit (24) for storing power of which the voltage is stepped up by said stepping up circuit; and switch means (21) provided between said storing circuit and said power amplifier circuit for supplying power stored in said storing circuit to said power amplifier circuit (12) only while said power amplifier circuit is amplifying said transmitted signal in substance.
Claim 7
Dependent Claim
61 words
A radiocommunication apparatus according to claim 6, wherein said transmitted signal is a signal transmitted as a burst signal in concurrence with the timing slot allotted thereto correspondingly to the transmission timing of said transmitted signal and the power supply from said storing circuit (24) to said power amplifier circuit (12) is performed at the transmission timing of said burst signal.
Claim 8
Dependent Claim
163 words
A radiocommunication apparatus according to claim 7, wherein said signal processing circuit has a transmit signal generator circuit for generating a transmitted signal and supplying the generated signal to said power amplifier circuit (12), said switch means (21) has a switch circuit provided between said storing circuit and said power amplifier circuit and control means for controlling said transmit signal generator circuit for timing and switching said switch circuit, and wherein said control means, while it is controlling said transmit signal generator circuit to generate a transmitted signal at predetermined timing, controls said switch circuit (21) to turn on so that power stored in said storing circuit (24) is supplied to the power-supply terminal of said power amplifier circuit (12), and during a period set thereby in which said transmit signal generator circuit is not allowed to generate a signal, controls said switch circuit to turn off so that the power supply from said storing circuit to said power amplifier circuit is stopped.
Claim 9
Dependent Claim
95 words
A radiocommunication apparatus according to claim 8, wherein said apparatus further comprises a power-supply switch (22) connected between said battery (20) and said stepping up circuit (23), said control means further controlling said power-supply switch to turn on when signal transmission using said power amplifier circuit (12) is performed so that power is supplied from said battery to said stepping up circuit and controlling said power-supply switch to turn off when signal transmission using said power amplifier circuit is not performed so that power supply from said battery to said stepping up circuit is stopped.
Claim 10
Dependent Claim
58 words
A radiocommunication apparatus according to claim 6, wherein said stepping up circuit includes a DC/DC converter (23) operating at least within the range of an input voltage thereto between the full-charged voltage and ultimate voltage of said battery (20) for stepping up the input voltage to a voltage above the operating voltage of said power amplifier circuit (12).
Claim 11
Dependent Claim
15 words
A radiocommunication apparatus according to claim 6, wherein said storing circuit has a capacitor (24).
Claim 12
Dependent Claim
23 words
A radiocommunication apparatus according to claim 6, wherein the ultimate voltage of said battery (20) is less than 60% of the full-charged voltage.
Claim 13
Dependent Claim
18 words
A radiocommunication apparatus according to claim 6, wherein said battery (20) is constituted of one lithium ion cell.
Claim 14
Dependent Claim
17 words
A radiocommunication apparatus according to claim 6, wherein said radiocommunication apparatus is a portable radiocommunication apparatus (1).
References Cited (Backward Citations)
No citation records indexed.
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