EP0303067A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cordless telephone with battery saving function
Assignee: NEC Corp
•
Filing: 1988-07-15
•
Granted: —
•
Expires: 2008-07-15
Abstract
Abstract The cordless telephone includes a fixed unit (1) and a portable unit (2) which are communicatable with each other over a radio link, the portable unit (2) comprises a rechargeable battery (215), and a battery saving circuit responsive to a control signal for interrupting power supply to predetermined sections of the portable unit (2). The fixed unit (1) comprises a charging circuit (115) for converting an AC voltage into a DC voltage to produce a charging voltage, a detector for, when the battery of the portable unit (2) is charged by the charging voltage, detecting that the battery is being charged and outputting a detect signal, and a supply circuit responsive to the detect signal for outputting the control signal and supplying the control signal to the portable unit together with the charging voltage. This cordless telephone saves a battery of a portable unit which is selectively chargeable by a fixed unit and a separate charger only when the portable unit is set in the fixed unit. Moreover, the charging time is reduced when the portable unit is charged by the fixed unit.
Inventors
- 👤 Masayuki Makino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 23:41
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/73; G; G06; G06F; G06F9/00; G06F9/06; G06F9/46; G06F9/48; G06F9/4806; G06F9/4843; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
127 words
A cordless telephone including a fixed unit and a portable unit which are communicatable with each other over a radio link, said portable unit comprising: rechargeable battery means; and battery saving means responsive to a control signal for interrupting power supply to predetermined sections of said portable unit; said fixed unit comprising: charging means for converting an AC voltage into a DC voltage to produce a charging voltage; detecting means for, when said battery means of said portable unit is charged by the charging voltage, detecting that said battery means is being charged and for outputting a detect signal; and supplying means responsive to said detect signal for outputting said control signal and for supplying said control signal to said portable unit together with said charging voltage.
Claim 2
Dependent Claim
127 words
A cordless telephone including a fixed unit and a portable unit which are communicatable with each other over a radio link, said portable unit comprising: rechargeable battery means; and battery saving means responsive to a control signal for interrupting power supply to predetermined sections of said portable unit; said fixed unit comprising: charging means for converting an AC voltage into a DC voltage to produce a charging voltage; detecting means for, when said battery means of said portable unit is charged by the charging voltage, detecting that said battery means is being charged and for outputting a detect signal; and supplying means responsive to said detect signal for outputting said control signal and for supplying said control signal to said portable unit together with said charging voltage.
Claim 3
Dependent Claim
36 words
A cordless telephone as claimed in claim 1, further comprising a charger independent of said fixed unit for converting an AC voltage into a DC voltage to produce a charging voltage for charging said battery means.
Claim 4
Dependent Claim
29 words
A cordless telephone as claimed in claim 1 or 2, wherein said predetermined sections of said portable unit comprises a transmitter section, a receiver section, and a frequency synthesizer.
Claim 5
Dependent Claim
131 words
A cordless telephone as claimed in any of claims 1 to 3, wherein said detecting means of said fixed unit comprises means for picking up a voltage which is proportional to said charging voltage, and comparing means for comparing the voltage picked up by said picking-up means with a reference voltage and for outputting a result of comparison as a high-level signal and a low-level signal selectively, and wherein said supplying means comprises means supplied with one of said high-level signal and said low-level signal for outputting as said control signal an intermittent signal which continues for a predetermined period of time, and discontinuing means for periodically discontinuing said charging voltage in response to said intermittent signal to supply said control signal to said portable unit together with said charging voltage.
Claim 6
Dependent Claim
53 words
A cordless telephone as claimed in claim 4, wherein said discontinuing means of said fixed unit comprises a first transistor which becomes conductive and non-conductive in response to said intermittent signal, and a second transistor turning on and off said charging voltage in response to respectively conduction and non-conduction of said first transistor.
Claim 7
Dependent Claim
51 words
A cordless telephone as claimed in claim 4 or 5,wherein said battery saving means of said portable unit comprises charge detecting means responsive to said charging voltage periodically discontinued for outputting a second intermittent signal, and means responsive to said second intermittent signal for interrupting power supply to said predetermined sections.
Claim 8
Dependent Claim
54 words
A cordless telephone as claimed in claim 6, wherein said charge detecting means of said portable unit comprises a transistor which becomes conductive and non-conductive in response to said charging voltage periodically discontinued, and means for picking up a collector voltage of said transistor to output said collector voltage as said second intermittent signal.
Claim 9
Dependent Claim
29 words
A cordless telephone as claimed in claim 7, wherein said charge detecting means of said portable unit further comprises a limiter diode connected to a base of said transistor.
Claim 10
Dependent Claim
151 words
A cordless telephone having a fixed unit and a portable unit which are communicatable with each other over a radio link, said fixed unit comprising: charging means for converting an AC voltage to supply a DC voltage; first charge terminal means for supplying said DC voltage to outside; detecting means for detecting a change in said DC voltage appearing on said first charge terminal means; and supplying means for supplying a control signal to said first charge terminal means in response to an output of said detecting means; said portable unit comprising: second charge terminal means connectable to said first charge terminal means; battery means chargeable by said DC voltage which is supplied through said first and second charge terminal means; and means for interrupting power supply to predetermined sections of said portable unit in response to said control signal which is fed through said first and second charge terminal means.
Claim 11
Dependent Claim
151 words
A cordless telephone having a fixed unit and a portable unit which are communicatable with each other over a radio link, said fixed unit comprising: charging means for converting an AC voltage to supply a DC voltage; first charge terminal means for supplying said DC voltage to outside; detecting means for detecting a change in said DC voltage appearing on said first charge terminal means; and supplying means for supplying a control signal to said first charge terminal means in response to an output of said detecting means; said portable unit comprising: second charge terminal means connectable to said first charge terminal means; battery means chargeable by said DC voltage which is supplied through said first and second charge terminal means; and means for interrupting power supply to predetermined sections of said portable unit in response to said control signal which is fed through said first and second charge terminal means.
Claim 12
Dependent Claim
26 words
A cordless telephone as claimed in claim 9, wherein said control signal is produced by intermittently supplying said DC voltage for a predetermined period of time.
Claim 13
Dependent Claim
79 words
A cordless telephone comprising: a fixed unit connected to an exchange by a subscriber line; a portable unit communicatable with said fixed unit over a radio link; charging means for charging a rechargeable battery of said portable unit when said portable unit is set in said fixed unit; detecting means for detecting charging of said battery; and power control means responsive to an output of said detecting means for interrupting power supply to predetermined sections of said portable unit.
Claim 14
Dependent Claim
79 words
A cordless telephone comprising: a fixed unit connected to an exchange by a subscriber line; a portable unit communicatable with said fixed unit over a radio link; charging means for charging a rechargeable battery of said portable unit when said portable unit is set in said fixed unit; detecting means for detecting charging of said battery; and power control means responsive to an output of said detecting means for interrupting power supply to predetermined sections of said portable unit.
Claim 15
Dependent Claim
154 words
A cordless telephone as claimed in claim 11, wherein said charging means comprises AC/DC converting means for converting an AC voltage into a DC voltage, and first charge terminal means and second charge terminal means respectively installed in said fixed unit and said portable unit for conducting said DC voltage to said battery, and wherein said detecting means comprises start detecting means connected to said first charge terminal means for detecting a start of charging of said battery in terms of a change in said DC voltage, and wherein said power control means comprises means for outputting an intermittent signal in response to an output of said start detecting means, means for periodically discontinuing said DC voltage in response to said intermittent signal, means for outputting a power control signal by detecting said DC voltage periodically discontinued, and means for interrupting power supply to said predetermined sections in response to said power control signal.
Claim 16
Dependent Claim
128 words
A cordless telephone as claimed in claim 11 or 12, wherein said fixed unit comprises a first transmitter section and a first receiver section each being connected to said exchange, and a first synthesizer section for delivering a predetermined local oscillation signal to each of said first transmitter section and said first receiver section, and wherein said portable unit comprises a second transmitter section and a second receiver section tunable to the same radio channel as said first transmitter section and said first receiver section, and a second synthesizer section for delivering a predetermined local oscillation signal to each of said second transmitter section and said second receiver section, and wherein said predetermined sections comprises said second transmitter section, said second receiver section, and said second synthesizer section.
Claim 17
Dependent Claim
150 words
A cordless telephone including a portable unit having a control section which controls setting of operation modes including a battery saving mode and a battery, and a fixed unit connectable to said portable unit by radio and having a charging section for charging said battery when said portable unit is set in said portable unit, said fixed unit comprising: start detecting means for detecting that said charging section has started charging said battery; and charge signal generating means for, when said start detecting means has detected a start of charging, superposing a charge signal on an output of said charging section; said portable unit comprising charge signal detecting means for detecting said charge signal which is superposed on the output of said charging section of said fixed unit; said control section conditioning said portable unit for said battery saving mode when said charge signal detecting means detects said charge signal
Claim 18
Dependent Claim
150 words
A cordless telephone including a portable unit having a control section which controls setting of operation modes including a battery saving mode and a battery, and a fixed unit connectable to said portable unit by radio and having a charging section for charging said battery when said portable unit is set in said portable unit, said fixed unit comprising: start detecting means for detecting that said charging section has started charging said battery; and charge signal generating means for, when said start detecting means has detected a start of charging, superposing a charge signal on an output of said charging section; said portable unit comprising charge signal detecting means for detecting said charge signal which is superposed on the output of said charging section of said fixed unit; said control section conditioning said portable unit for said battery saving mode when said charge signal detecting means detects said charge signal
Claim 19
Independent Claim
87 words
A method of saving a rechargeable battery of a portable unit which is communicatable with a fixed unit by radio, comprising the steps of: setting said portable unit in said fixed unit to charge said battery; detecting charging of said battery at said fixed unit; delivering a control signal from said fixed unit to said portable unit through charge terminals in response to detection of said charging of said battery; and interrupting power supply to predetermined sections of said portable unit in response to said control signal.
Claim 20
Independent Claim
87 words
A method of saving a rechargeable battery of a portable unit which is communicatable with a fixed unit by radio, comprising the steps of: setting said portable unit in said fixed unit to charge said battery; detecting charging of said battery at said fixed unit; delivering a control signal from said fixed unit to said portable unit through charge terminals in response to detection of said charging of said battery; and interrupting power supply to predetermined sections of said portable unit in response to said control signal.
Claim 21
Dependent Claim
29 words
A method as claimed in claim 15, wherein the step of delivering said control signal comprises the step of periodically discontinuing a voltage which is to charge said battery.
Claim 22
Dependent Claim
32 words
A method as claimed in claim 15 or 16, further comprising the step of setting said portable unit in a charger which is independent of said fixed unit to charge said battery.
Claim 23
Independent Claim
85 words
A method of saving a rechargeable battery of a portable unit which is connectable by radio to a fixed unit which is connected to an exchange by a subscriber line, comprising the steps of; charging said battery with said portable unit being set in said fixed unit; detecting a start of charging of said battery; and responsive to detection of a start of charging, interrupting power supply to predetermined sections which include at least a transmitter section and a receiver section of said portable unit.
Claim 24
Independent Claim
85 words
A method of saving a rechargeable battery of a portable unit which is connectable by radio to a fixed unit which is connected to an exchange by a subscriber line, comprising the steps of; charging said battery with said portable unit being set in said fixed unit; detecting a start of charging of said battery; and responsive to detection of a start of charging, interrupting power supply to predetermined sections which include at least a transmitter section and a receiver section of said portable unit.
Claim 25
Dependent Claim
38 words
A method as claimed in claim 18, wherein said start of charging is detected at said fixed unit, the detection of said start of charging being transferred from said fixed unit to said portable unit through charging terminals.
Claim 26
Dependent Claim
44 words
A method as claimed in claim 18 or 19, further comprising the steps of: charging said battery by a charger which is independent of said fixed unit; and establishing power supply to said predetermined sections when said charger is used to charge said battery.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.