Electrical power supply circuit, in particular for portable appliances
First Claim
Patent Images
1. An electricity power supply circuit for an external appliance whose power consumption varies over time, the circuit comprising:
- an electrochemical cell;
a supercapacitor serving as a source of power for said appliance;
a voltage converting chopper connected to charge the supercapacitor with electricity taken from the cell; and
a control circuit for controlling said voltage converting chopper in such a manner that said voltage converting chopper charges the supercapacitor at a controlled, constant current level whenever the voltage across the terminals of the supercapacitor is less that a first threshold, and that said voltage converting chopper ceases to operate when the voltage across the terminals of the supercapacitor reaches a second threshold greater than the first threshold.
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Abstract
An electricity power supply circuit for an external appliance whose consumption varies over time. The circuit comprises an electrochemical cell, a supercapacitor serving as a source of electricity for said appliance, and a chopper voltage converter between the cell and the supercapacitor, the converter serving to charge the supercapacitor at constant current while monitoring the voltage across the terminals thereof. The circuit is applicable to cellular radiotelephones.
108 Citations
8 Claims
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1. An electricity power supply circuit for an external appliance whose power consumption varies over time, the circuit comprising:
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an electrochemical cell; a supercapacitor serving as a source of power for said appliance; a voltage converting chopper connected to charge the supercapacitor with electricity taken from the cell; and a control circuit for controlling said voltage converting chopper in such a manner that said voltage converting chopper charges the supercapacitor at a controlled, constant current level whenever the voltage across the terminals of the supercapacitor is less that a first threshold, and that said voltage converting chopper ceases to operate when the voltage across the terminals of the supercapacitor reaches a second threshold greater than the first threshold. - View Dependent Claims (2, 3, 4, 7)
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5. A cellular radiotelephone transmitter/receiver comprising:
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an electrochemical cell; a supercapacitor serving as a source of power for said radiotelephone; a voltage converting chopper connected to charge the supercapacitor with electricity taken from the cell; a control circuit for controlling said voltage converting chopper in such a manner that said voltage converting chopper charges the supercapacitor at a controlled, constant current level whenever the voltage across the terminals of the supercapacitor is less that a first threshold, and that said voltage converting chopper ceases to operate when the voltage across the terminals of the supercapacitor reaches a second threshold greater than the first threshold; and a switch for switching the voltage converting chopper OFF while the radiotelephone is receiving. - View Dependent Claims (6)
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8. A cellular radiotelephone transmitter/receiver comprising:
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an electrochemical cell; a supercapacitor serving as a source of power for said radiotelephone; a voltage converting chopper connected to charge the supercapacitor with electricity taken from the cell; and a control circuit for controlling said voltage converting chopper in such a manner that said voltage converting chopper charges the supercapacitor at a controlled, constant current level whenever the voltage across the terminals of the supercapacitor is less that a first threshold, and that said voltage converting chopper ceases to operate when the voltage across the terminals of the supercapacitor reaches a second threshold greater than the first threshold.
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Specification