| 摘要 |
<p>PURPOSE:To reduce the outflow of an abnormal current with an electronic computer by estimating the transient current fluctuation produced intermittently from the change of a bus signal and comparing said current fluctuation with the value set previously to control a spare constant current source, etc. CONSTITUTION:The estimated value data with which occurrence of the current fluctuation is estimated is stored in a memory 13 from a logic part of a computer. At the same time, the estimated value data corresponding to the command code of a bus signal is stored in a register 14. The higher 4 bits of the register 14 are connected to a decoder 36 for switch of the voltage of each power supply. While the lower 4 bits of the register 14 are supplied to a control type constant current source 19 via a D/A converter 51. Thus the current fluctuation of a constant voltage source 16 is compensated by the source 19 based on said estimated value data. Thus it is possible to eliminate the change of a data bus signal owing to occurrence of abnormality and therefore to prevent the outflow of an abnormal current caused by the short circuit of DC output, etc.</p> |
