Charging control circuit
First Claim
1. A charging control circuit comprising:
- a first connector (17) receiving an input supply power (34);
a second connector (30) for supplying a charging supply power (35) to either of a first or second kind of battery (33a or 33b) to be charged and receiving a discharging supply power (36) from either of said first and second kind of battery;
kind detection means (15) for detecting which of said first and second kind of battery is to be charged;
voltage detection means for detecting an electromotive force of said first or second kind of battery to be charged;
current detection means (R) for detecting a charging current to said first or second kind of battery to be charged;
reference signal generation means (15) for generating a reference signal (38) in accordance with outputs from said kind detection means, said current detection means, and said voltage detection means;
difference providing means (111) for providing a difference between said reference signal and said detected electromotive force; and
charging supply power generation means for generating said charging supply power from said input supply power in accordance with the output of said difference providing means (111).
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Accused Products
Abstract
A charging control circuit is disclosed which comprises: a 1st connector (17) receiving an input supply power (34); a 2nd connector (30) for supplying a charging supply power (35) to charge either of a 1st (Ni-Cd) or 2nd (Lithium ion) battery (33a, 33b) and receiving a discharging supply power (36) from the battery; a kind detection portion (15) for detecting which of the 1st and 2nd kind of battery is to be charged; a voltage detection circuit for detecting an emf of the battery to be charged; a current detection circuit for detecting a charging current to the battery to be charged; a REF signal generation portion (15) for generating a REF signal (38) in accordance with outputs from the kind detection portion, the current detection circuit, and the voltage detection circuit; a difference providing portion (111) for providing a difference between the REF signal and the detected emf; and a charging supply power generation circuit for generating the charging supply power from the input supply power according to the output of the difference providing portion (111). The Ni-Cd battery is charged by a constant current and the lithium ion battery, by a constant current and a constant voltage (4.1 V). Completion of charging is detected by a drop of emf of Ni-Cd and decrease in the charging current to Lithium ion battery.
17 Citations
9 Claims
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1. A charging control circuit comprising:
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a first connector (17) receiving an input supply power (34); a second connector (30) for supplying a charging supply power (35) to either of a first or second kind of battery (33a or 33b) to be charged and receiving a discharging supply power (36) from either of said first and second kind of battery; kind detection means (15) for detecting which of said first and second kind of battery is to be charged; voltage detection means for detecting an electromotive force of said first or second kind of battery to be charged; current detection means (R) for detecting a charging current to said first or second kind of battery to be charged; reference signal generation means (15) for generating a reference signal (38) in accordance with outputs from said kind detection means, said current detection means, and said voltage detection means; difference providing means (111) for providing a difference between said reference signal and said detected electromotive force; and charging supply power generation means for generating said charging supply power from said input supply power in accordance with the output of said difference providing means (111). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification