Cordless telephone with battery saving function
First Claim
1. In 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.
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Accused Products
Abstract
A cordless telephone system includes a fixed unit and a portable unit which communicate with each other over a radio link. The portable unit includes a rechargeable battery, and a battery saving device for interrupting a power supply to predetermined sections of the portable unit in response to a control signal. The fixed unit includes a charging device for converting and AC voltage into a DC voltage to produce a charging voltage, and a detecting device for detecting when the rechargeable battery is being charged by the charging voltage, and for outputting a detection signal in response thereto. The fixed unit further includes a supplying device which is responsive to the detection signal for outputting the control signal and for supplying the control signal to the portable unit together with the charging voltage.
34 Citations
26 Claims
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1. In 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 20, 21, 22)
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9. In 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; 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. - View Dependent Claims (10)
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11. A cordless telephone comprising:
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a fixed unit connected to an exchange by a subscriber line; a portable unit communicable with said fixed unit over a radio link; charging means for charging a rechargeable battery of said portable unit through charging terminals when said portable unit is set in said fixed unit; detecting means included in said fixed u nit for detecting charging of said battery to produce a detection signal; control means responsive to said detection signal for sending a control signal through said charging terminals from said fixed unit to said portable unit; and power interrupt means responsive to said control signal for interrupting power supply to predetermined sections of said portable unit. - View Dependent Claims (12, 13)
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14. In 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.
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15. A method of saving a rechargeable battery of a portable unit which is communicatable with a fixed unit by radio, comprising the steps of:
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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 is response to said control signal. - View Dependent Claims (16, 17, 23, 24, 25, 26)
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18. 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:
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charging said battery when said portable unit is connected to said fixed unit through charging terminals; detecting charging of said battery at said fixed unit; responsive to the detection of the charging, sending a control signal from said fixed unit to said portable unit through said charging terminals; and responsive to said control signal, interrupting power supply to predetermined sections of said portable unit. - View Dependent Claims (19)
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Specification