Overdischarge and overvoltage protection circuit for a battery in a portable and mobile communication system
First Claim
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1. A battery overdischarge protection circuit having a battery means, a radio transmitting and receiving means, a controller means, a speaker means, and a display means, said circuit comprises:
- low-power detection means for generating a low-power signal to disconnect a power supply generated by said battery means when a voltage of said battery means falls below a first reference voltage;
low-battery detection means for generating a warning signal indicative of said power supply being deficient when said voltage of said battery means falls below a second reference voltage;
battery termination detection means for generating a battery terminated signal to disconnect said power supply when said voltage of said battery means falls below a third reference voltage;
power supply controller means for disconnecting said power supply of said battery means in response to said low-power signal generated from said low-power detection means; and
reference voltage converter means for providing said second and third reference voltages for said low-battery detection means and said battery termination detection means in dependence upon selection of one of a stand-by mode and a call mode by said controller means.
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Abstract
There is disclosed a circuit for protecting against overdischarge and overvoltage of a battery in a portable, mobile, and radio communication system including a low-power detection unit, a low-battery signal detection unit, a battery termination detection unit, a power supply controller, and a reference voltage converter.
65 Citations
20 Claims
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1. A battery overdischarge protection circuit having a battery means, a radio transmitting and receiving means, a controller means, a speaker means, and a display means, said circuit comprises:
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low-power detection means for generating a low-power signal to disconnect a power supply generated by said battery means when a voltage of said battery means falls below a first reference voltage; low-battery detection means for generating a warning signal indicative of said power supply being deficient when said voltage of said battery means falls below a second reference voltage; battery termination detection means for generating a battery terminated signal to disconnect said power supply when said voltage of said battery means falls below a third reference voltage; power supply controller means for disconnecting said power supply of said battery means in response to said low-power signal generated from said low-power detection means; and reference voltage converter means for providing said second and third reference voltages for said low-battery detection means and said battery termination detection means in dependence upon selection of one of a stand-by mode and a call mode by said controller means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An overdischarge and overvoltage protection circuit for a battery of an electrical system, said circuit comprising:
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low-power detector means coupled to receive battery power voltage of said battery, said low-power detector means comparing said battery power voltage with a first reference voltage to provide a low-power signal; power controller means for disconnecting said battery power voltage of said battery to replace said battery power voltage with an external power voltage in response to said low-power signal; low-battery detector means coupled to receive said battery power voltage of said battery, said low-battery detector means comparing said battery power voltage with a second reference voltage to provide a low-battery signal when said battery power voltage is lower than said second reference voltage; battery-termination detector means coupled to receive said battery power voltage of said battery, said battery-termination means comparing said battery power voltage with a third reference voltage to provide a battery terminated signal when said battery power voltage is lower than said third reference voltage; and reference voltage converter means for supplying said second and third reference voltages to said low-battery detector means and said battery-termination detector means, respectively said second and third reference voltages having voltage values depending upon selection of one of a stand-by mode and a call mode, with each voltage value of said second reference voltage being higher than each corresponding voltage value of said third reference voltage. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification