Battery charger
First Claim
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1. A battery charger, having at least a first and a second charging mode, for charging a battery in a battery powered device having at least a first and a second operating mode, the battery charger comprising:
- a clock signal input for receiving a clock signal from the battery powered device, the battery powered device outputting a first clock signal during the first operating mode and a second clock signal during the second operating mode;
a clock detection circuit for detecting the first clock signal and the second clock signal; and
a variable current source for generating a first current in the first charging mode when the first clock signal is detected and a second current in the second charging mode when the second clock signal is detected.
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Abstract
The battery charging system of the present invention charges the battery of a portable, multiple mode radiotelephone while the radiotelephone is operating. The radiotelephone generates a clock signal having varying on/off times dependent on the radiotelephone'"'"'s mode. This mode can include an analog cellular mode or a digital cellular mode. The battery charger detects the clock signal'"'"'s on/off times and changes the average charge current to compensate for one mode requiring a larger charge current.
14 Citations
11 Claims
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1. A battery charger, having at least a first and a second charging mode, for charging a battery in a battery powered device having at least a first and a second operating mode, the battery charger comprising:
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a clock signal input for receiving a clock signal from the battery powered device, the battery powered device outputting a first clock signal during the first operating mode and a second clock signal during the second operating mode; a clock detection circuit for detecting the first clock signal and the second clock signal; and a variable current source for generating a first current in the first charging mode when the first clock signal is detected and a second current in the second charging mode when the second clock signal is detected.
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2. A battery charger, having at least a high output mode and a low output mode, for charging a battery in a battery powered radiotelephone having a digital operating mode and an analog operating mode, the battery charger comprising:
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a clock signal input for receiving a clock signal from the battery powered radiotelephone, the battery powered radiotelephone outputting a first clock signal during the analog operating mode and a second clock signal during the digital operating mode; a clock detection circuit for detecting the first clock signal and the second clock signal; and a variable current source for generating a first current in the high output mode when the first clock signal is detected and a second current in the low output mode when the second clock signal is detected, the first current being larger than the second current. - View Dependent Claims (3)
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4. A battery charger, having an average charge current, for charging a battery in a battery powered radiotelephone having a digital operating mode and an analog operating mode, the charger also supplying power to the radiotelephone, the battery charger comprising:
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a clock signal input for receiving a clock signal from the battery powered radiotelephone, the clock signal having varying on and off times in response to the digital operating mode and the analog operating mode; a clock detection circuit for detecting the varying on and off times; a first current source for generating a first current; and a second current source for generating a second current, the first and second current sources together generating the average charge current in response to the varying on and off times. - View Dependent Claims (5)
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6. A method for charging a battery in a battery powered device having a digital operating mode and an analog operating mode, the method comprising the steps of:
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the battery powered radiotelephone generating a clock signal, the clock signal having varying on and off times in response to the digital operating mode and the analog operating mode; detecting the varying on and off times; and generating an average charge current in response to the varying on and off times.
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7. A method of charging a battery in a battery charger having at least a first and a second charging mode, the charger charging a battery in a battery powered device having at least a first and a second operating mode, the method comprising the steps of:
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generating, in the battery powered device, a first clock signal during the first operating mode and a second clock signal during the second operating mode; detecting, in the battery charger, the first clock signal and the second clock signal; and generating, in the battery charger, a first current in the first charging mode when the first clock signal is detected and a second current in the second charging mode when the second clock signal is detected.
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8. A method of charging a battery in a battery charger having at least a high output mode and a low output mode, the charger charging a battery in a battery powered radiotelephone having a digital operating mode and an analog operating mode, the method comprising the steps of:
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generating, in the battery powered radiotelephone, a first clock signal during the analog operating mode and a second clock signal during the digital operating mode; detecting, in the battery charger, the first clock signal and the second clock signal; and generating, in the battery charger, a first current in the high output mode when the first clock signal is detected and a second current in the low output mode when the second clock signal is detected, the first current being larger than the second current. - View Dependent Claims (9)
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10. A method of generating an average charge current in a battery charger, the charger charging a battery in a battery powered radiotelephone having a digital operating mode and an analog operating mode, the charger also supplying power to the radiotelephone, the method comprising the steps of:
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generating, in the battery powered radiotelephone, a clock signal having varying on and off times in response to the digital operating mode and the analog operating mode; detecting, in the battery charger, the varying on and off times; and generating, in the battery charger, the average charge current in response to the varying on and off times. - View Dependent Claims (11)
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Specification