| 摘要 |
A battery pack (70) is provided which can be suitably used in a case where charging of a dedicated secondary battery (20) in a portable terminal device (10) is difficult. The battery pack (70) is mounted in a battery mounting section (11) in a portable cellular phone (portable terminal device (10)) proper. In the battery pack (70), alkaline accumulators (71, 72) are connected in series. Alkaline accumulators (71, 72) generate electromotive forces having a voltage (3V) being lower than that of the dedicated secondary battery (20). A power source circuit (73) has a boosting-type DC/DC converter (73b) which boosts a voltage of the alkaline accumulators (71, 72) being connected in series at a level being same as that of the dedicated secondary battery (20) (for example, 4. 5V), and outputs the boosted voltage. An electrical double layer capacitor (74) has a capacity to feed stable power to an internal circuit (50) in which power consumption increases or decreases in a burst manner and is charged by application of an output of the power source circuit (73) and stores the power. (See Fig. 2) <IMAGE> <IMAGE> <IMAGE> |
