Battery pack
First Claim
1. A battery pack having a secondary battery, comprising:
- a holding unit for detachably holding a primary battery;
a switch for switching a voltage of said primary battery and a voltage at an external terminal;
a voltage converter to which either said primary battery voltage or said external terminal voltage selected by said switch is inputted and which supplies a stabilized output voltage to a positive polarity side of said secondary battery; and
control means for controlling said switch so as to select said external terminal voltage in a normal state and, when said primary battery is attached, select said primary battery voltage.
1 Assignment
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Accused Products
Abstract
A detecting switch which is turned on/off in accordance with whether or not primary batteries have been attached to a primary battery holder is provided. In a normal state where no primary battery is attached, terminals (a, c) of a charge change-over switch are connected by a detection signal of the detecting switch, so that a voltage supplied from an external charger is inputted to a DC/DC converter. A secondary battery is charged by a predetermined value output of the DC/DC converter. When the primary batteries are attached, the detecting switch is turned on and terminals (b, c) of the charge change-over switch are connected, so that an output voltage of the primary batteries is inputted to the DC/DC converter. The secondary battery is charged by the predetermined value output of the DC/DC converter. Even when there is no charger, the secondary battery can be charged by the primary batteries and charging power sources are automatically switched.
48 Citations
9 Claims
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1. A battery pack having a secondary battery, comprising:
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a holding unit for detachably holding a primary battery;
a switch for switching a voltage of said primary battery and a voltage at an external terminal;
a voltage converter to which either said primary battery voltage or said external terminal voltage selected by said switch is inputted and which supplies a stabilized output voltage to a positive polarity side of said secondary battery; and
control means for controlling said switch so as to select said external terminal voltage in a normal state and, when said primary battery is attached, select said primary battery voltage. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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2. A battery pack having a secondary battery, comprising:
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a holding unit for detachably holding a primary battery;
a switch for switching a voltage of said primary battery and a voltage at an external terminal;
a voltage converter to which either said primary battery voltage or said external terminal voltage selected by said switch is inputted and which supplies a stabilized output voltage to a positive polarity side of said secondary battery; and
control means for controlling said switch so as to select said primary battery voltage in a normal state and, when said external terminal voltage is supplied, select said external terminal voltage.
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Specification