| 摘要 |
A BATTERY CHARGER WHICH CAN SAFELY CHARGE A LITHIUM ION BATTERY (106). BATTERY CHARGER HAVING A POWER SOURCE (101) WHICH SUPPLIES ELECTRIC POWER, A CHARGING CONTROL CIRCUIT (102) FOR CHARGING A BATTERY (106) BY CONTROLLING THE CURRENT AND VOLTAGE BASED ON SUPPLIED ELECTRIC POWER, A CHARGING CURRENT DETECTION CIRCUIT (104) FOR DETECTING A CURRENT VALUE FOR CHARGING THE BATTERY (106), A CHARGING VOLTAGE DETECTION CIRCUIT (103) FOR DETECTING A VOLTAGE VALUE FOR CHARGING THE BATTERY (106),AND A CONTROLLER(107,108,109) FOR HOLDING A FIRST VOLTAGE WHICH IS A FIXED VOLTAGE VALUE FOR CONSTANT VOLTAGE CHARGING, A SECOND VOLTAGE VALUE SMALLER THAN THE FIRST VOLTAGE VALUE, A FIRST CURRENT VALUE WHICH IS A FIXED CURRENT VALUE FOR CONSTANT CURRENT CHARGING, AND A SECOND CURRENT VALUE SMALLER THAN THE FIRST CURRENT VALUE. THE BATTERY CHARGER CONTROLS THE CHARGING CONTROL CIRCUIT (102) SO AS TO PERFORM I) CONSTANT CURRENT CHARGING AT THE FIRST CURRENT VALUE UNTIL THE VOLTAGE VALUE DETECTED BY THE CHARGING VOLTAGE DETECTION CIRCUIT (103) REACHES THE SECOND VOLTAGE VALUE, II) CONSTANT VOLTAGE CHARGING AT THE SECOND VOLTAGE VALUE WHEN THE VOLTAGE VALUE DETECTED BY THE CHARGING VOLTAGE DETECTION CIRCUIT (103) REACHES THE SECOND VOLTAGE VALUE, III) CONSTANT CURRENT CHARGING AT THE FIRST CURRENT VALUE AGAIN WHEN THE CURRENT VALUE DETECTED BY THE CHARGING CURRENT DETECTION CIRCUIT(104) DROPS TO THE SECOND CURRENT VALUE, AND IV) CONSTANT VOLTAGE CHARGING AT THE FIRST VOLTAGE VALUE WHEN THE VOLTAGE VALUE DETECTED BY THE CHARGING VOLTAGE DETECTION CIRCUIT (103) REACHES THE FIRST VOLTAGE VALUE, THEREBY CHARGING THE LITHIUM ION BATTERY (106) (FIG 1)
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