| 摘要 |
PROBLEM TO BE SOLVED: To ensure a voltage required for control using a simple and inexpensive arrangement, even when the battery voltage is low. SOLUTION: When a PWM control AC/DC converter is employed for charging a lithium ion battery, the voltage of a battery 9 to be charged may be as low as 2 V. Since the secondary voltage is also close to the battery voltage in this case and charge control is disabled, a current control element (FET) 2 is connected in series between the output end Tv of a secondary rectifying/ smoothing section 1 and the battery 9, and its control (gate) terminal is controlled so as to ensure a voltage required for control.
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