| 摘要 |
PURPOSE:To evade a detrimental state such as loss of functions of a satellite by providing a current limit circuit applying a prescribed power to a low voltage bus between a high voltage bus and the loss voltage bus. CONSTITUTION:If deficiency of power is caused to an HK bus 23 to a low voltage side such as deficiency of power generating capability of a HK solar battery panel 24 because of any cause, current limit resistors R1-Rn are selected depending on the degree of deficiency, they turn on respective on/off relays K1-Kn by using a command from an earth station, and the deficient power is supplied from a high voltage MP bus 22 to a us 23 via the on/off really turned on and the corresponding current limit resistor. In this case, a value of the resistors R1-Rn to be selected is expressed as Rn=(MP bus voltage -HK bus voltage - diode drop voltage)/deficient current. Further, a value of RT=(MP bus voltage - HK bus voltage - diode drop voltage)/HK device maximum current, taking the worst case into account. |
