CHARGING CIRCUIT AND CHARGING METHOD EMPLOYING THE SAME
First Claim
1. A charging circuit electrically connected between a battery charger and a battery, comprising:
- a transistor comprising an emitter, a base and a collector, the emitter electrically connected to the battery charger;
a current regulating resistor electrically connected to the base of the transistor;
a field effect transistor comprising a source, a gate and a drain, the source electrically connected to the collector of the transistor, the drain electrically connected to the battery; and
a main controller that electrically connects the collector of the transistor to receive electrical energy, the main controller comprising;
a current control unit that electrically connects the base of the transistor through the current regulating resistor;
a charge control unit that electrically connects the gate of the field effect transistor; and
a voltage detection unit that electrically connects the charge control unit, the drain of the field effect transistor and the battery, wherein the current control unit transmits current signals to the base of the transistor to turn on the transistor and regulate the current values of the collector, the voltage detection unit detects the voltage of the battery to controls the charge control unit accordingly, and the charge control unit sends a command signal to the gate to switch the field effect transistor on or off.
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Accused Products
Abstract
A charging circuit includes a transistor, a current regulating resistor, a field effect transistor (FET) and a main controller. The transistor includes an emitter, a base and a collector, the FET includes a source, a gate and a drain. The emitter is connected to the battery charger; the drain is connected to the battery. The main controller includes a current control unit, a charge control unit and a voltage detection unit. The current control unit transmits current signals to the base of the transistor to turn on the transistor and regulate the current values of the collector, the voltage detection unit detects the voltage of the battery and controls the charge control unit according to detection result, and the charge control unit sends a command signal to the gate to switch the FET on or off.
11 Citations
20 Claims
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1. A charging circuit electrically connected between a battery charger and a battery, comprising:
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a transistor comprising an emitter, a base and a collector, the emitter electrically connected to the battery charger; a current regulating resistor electrically connected to the base of the transistor; a field effect transistor comprising a source, a gate and a drain, the source electrically connected to the collector of the transistor, the drain electrically connected to the battery; and a main controller that electrically connects the collector of the transistor to receive electrical energy, the main controller comprising; a current control unit that electrically connects the base of the transistor through the current regulating resistor; a charge control unit that electrically connects the gate of the field effect transistor; and a voltage detection unit that electrically connects the charge control unit, the drain of the field effect transistor and the battery, wherein the current control unit transmits current signals to the base of the transistor to turn on the transistor and regulate the current values of the collector, the voltage detection unit detects the voltage of the battery to controls the charge control unit accordingly, and the charge control unit sends a command signal to the gate to switch the field effect transistor on or off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A charging circuit, comprising:
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a transistor comprising an emitter, a base and a collector, the emitter electrically connected to a battery charger; a current regulating resistor electrically connected to the base of the transistor; a field effect transistor comprising a source, a gate and a drain, the source connected to the collector of the transistor, the drain electrically connected to a battery; and a main controller that electrically connects the collector of the transistor to receive electrical energy, the main controller comprising; a current control unit that electrically connects the base of the transistor through the current regulating resistor; a charge control unit that electrically connects the gate of the field effect transistor; a voltage detection unit that electrically connects the charge control unit, the drain of the field effect transistor and the battery; and a switch that electrically connects the battery, the voltage detection unit and the collector of the transistor, wherein the current control unit provides and transmits a low current signal to the base of the transistor to the turn on the transistor and regulate the current value of the collector, when the switch is turned off controlled by the voltage detection unit, a first charging path is formed by the battery charger, the transistor, the switch and the battery to charge the battery;
when the switch is turned on controlled by the voltage detection unit, a second charging path is formed by the battery charger, the transistor, the field effect transistor and the battery to charge the battery. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A charging method for charging a battery using a battery charger, the charging method comprising steps of:
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providing a charging circuit that comprising a main controller, a transistor, and a field effect transistor, the main controller comprising a current control unit, a charge control unit, and a switch; connecting the charging circuit to the battery charger; powering the main controller of the charging circuit; turning on the transistor under the control of the current control unit to form a first charging path; charging the battery using the first charging path; turning on the field effect transistor controlled by the charge control unit to form a second charging path; and cutting the first charging path to charge the battery using a second charging path. - View Dependent Claims (20)
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Specification