Battery protective circuit

A battery protective circuit, comprising:

• 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.

A battery protective circuit, comprising:

• 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.

A process for protecting a battery, comprising:

• 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.