| 摘要 |
<p>PROBLEM TO BE SOLVED: To make an adapter board itself into mechanism capable of stably performing a prescribed completion processing in the case of power interruption. SOLUTION: This adapter board is freely attachably/detachably installed to host equipment through an extension bus 11 and receives power supply from the host equipment through power supply lines L1, L2 when it is connected. A DC-DC converter 17 is inserted into the power supply line L1, voltage is raised even when input becomes about 2 V and output is held as 5 V. Consequently, voltage to be supplied to a main body circuit 15 is held as 5 V for fixed period until the input drops to about 2 V even when the power supply from the host equipment is interrupted. On the other hand, a power-off monitoring part 20 is connected with the power line L1, the voltage to be supplied is monitored and when voltage drop us detected by the power-off monitoring part, a detection signal (with low PFD) is provided to a completion processing part 23 of the main body circuit. The completion processing part executes the prescribed completion processing while the voltage is held by the DC-DC converter.</p> |
