Battery protective circuit
First Claim
1. A battery protective circuit, comprising:
- comparison means for comparing a voltage of a re-charger with a second voltage provided by one of a battery supply voltage and an external supply voltage supplied to a main power terminal from adapter coupling means;
first switching means for cutting off battery current being applied to the re-charger when current is supplied by a battery, said re-charger being charged by connecting an external source of power to the re-charger when said comparison means determines that the re-charger voltage is lower than said second voltage; and
second switching means for causing power provided by the re-charger to be applied to the main power terminal when said comparison means determines that the re-charger voltage is higher than said second voltage.
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Accused Products
Abstract
A battery protective circuit for a portable cassette recorder equipping both battery and re-charger for preventing power consumption generated by the re-charger being charged by battery power when battery voltage is higher than re-charger voltage;
when the power is supplied to a terminal of an instrument main frame by battery power, the circuit can prevent the charging by the battery to the re-charger by way of cutting off the connection between re-charger and battery. The circuit can also prevent unnecessary consumption of battery by causing the charge of re-charger to be possible only when an adapter which supplies power from separate power source is connected;
the battery protective circuit in accordance with the present invention can obtain the effect of preventing unnecessary battery consumption and of lengthening the life span of battery by avoiding charging the re-charger through the battery.
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Citations
17 Claims
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1. A battery protective circuit, comprising:
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comparison means for comparing a voltage of a re-charger with a second voltage provided by one of a battery supply voltage and an external supply voltage supplied to a main power terminal from adapter coupling means; first switching means for cutting off battery current being applied to the re-charger when current is supplied by a battery, said re-charger being charged by connecting an external source of power to the re-charger when said comparison means determines that the re-charger voltage is lower than said second voltage; and second switching means for causing power provided by the re-charger to be applied to the main power terminal when said comparison means determines that the re-charger voltage is higher than said second voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery protective circuit, comprising:
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comparison means for comparing a voltage of a re-charger with a battery supply voltage supplied to a main power terminal from a coupling; first switching means for cutting off a battery current being applied to the re-charger when the battery current is supplied by a battery, said re-charger being charged by connecting an external supply voltage to the re-charger when said comparison means determines that the recharger voltage is lower than the battery supply voltage; and second switching means for causing said voltage of the re-charger to be applied to the main power terminal when said comparison means determines that the voltage of the re-charger is higher than the battery supply voltage. - View Dependent Claims (11, 12)
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13. A battery protective circuit, comprising:
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comparison means for comparing a voltage of a re-charger with an external supply voltage supplied to a main power terminal from a coupling; first switching means for cutting off a battery current being applied to the re-charger when the battery current is supplied by a battery, said re-charger being charged by connecting the external supply voltage to the re-charger when said comparison means determines that said voltage of the re-charger is lower than the external supply voltage; and second switching means for causing said voltage of the re-charger to be applied to the main power terminal when said comparison means determines that said voltage of the re-charger is higher than the external supply voltage. - View Dependent Claims (14, 15)
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16. A process for protecting a battery, comprising:
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comparing a voltage of a re-charger with an external supply voltage supplied to a main power terminal; interrupting a battery current being applied to the re-charger when the battery current is supplied by the battery, said re-charger being charged by connecting the external supply voltage to the re-charger when comparison means determines that said voltage of the re-charger is lower than the external supply voltage; and causing said voltage of the re-charger to be applied to the main power terminal when said comparison means determines that said voltage of the re-charger is higher than the external supply voltage. - View Dependent Claims (17)
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Specification