Transmit mode detector in a battery charger
AssigneeMotorola, Inc.
InventorRobert B. Ford
Life of this patent
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Abstract
A battery charger for charging a battery (4) for a radio (12), is provided having two terminals (6 and 8). A charging circuit (24 and 26) has a controllable parameter for charging the battery (4). An operational mode detector (30) is coupled to the two terminals (6 and 8) for detecting an operational mode of the radio. A control circuit (22) is coupled to the operational mode detector (30) and to the charging circuit (24 and 26) for controlling the controllable parameter in response to the operational mode detected.
Claims12
A battery charger having two terminals for charging a battery for a radio, the battery charger comprising:
- charging means having a controllable parameter for charging the battery;
- operational mode detector means coupled to the two terminals for detecting an operational mode of the radio in response only to the voltage detected across the two terminals;
- and
- control means coupled to the operational mode detector means and to the charging means for controlling the controllable parameter in response to the operational mode detected.
An automatic battery charging and voltage regulating system connected between a source of voltage and a battery to be changed, the battery being connected to current-consuming equipment, the system comprising:
- a pair of battery charging terminals;
- voltage sensing means having a first state in response to a battery charging terminal voltage below a first level and a second state in response to a battery charging terminal voltage above the first level;
- converter means for coupling to the source of voltage for developing a charging voltage for charging the battery;
- current control means coupled to the converter means and to the battery, the current control means being operative in response to the charging voltage, and limiting the charging current to a first maximum charging current in response to a first control signal coupled thereto, and to a second maximum charging current in response to a second control signal;
- and
- control circuit means, coupled to the current control means and to the battery, for developing the first control signal in response to the voltage sensing means being in the first state, and for developing the second control signal in response to the voltage sensing means being in the second state.
A transmit mode detector, for detecting a transmit mode of a rechargeable battery operated radio being charged by a battery charger, having two terminals for the battery, comprising:
- voltage sensing for sensing a voltage drop across the two terminals,
- a detector connected to the voltage sensing means for determining whether the voltage drop sensed corresponds to a threshold value for a transmission mode;
- output means for providing an output signal in response to detecting the threshold value;
- inhibit means connected to the output means for inhibiting the output means from providing the output signal, responsive to voltage drops not associated with the transmission mode;
- latching means connected to the output means and to the inhibit means for maintaining the level of the output signal for the duration of the transmission mode;
- and
- reset means for unlatching the latching at the end of the transmission mode.
Dependencies are inferred from the claim text.