| 摘要 |
A solid state power control (SSPC) controls flow of current from a power bus 12 to an inductive load 14. The SSPC utilizes load sharing, in which a plurality of current supply paths 20 are connected in parallel to control and share the flow of current between the power bus and the inductive load. Each current supply path includes a main power switching field effect transistor (FET) 34; a balance resistor 40, and a secondary FET 38. The balance resistor is connected between the main FET and the load. The secondary FET shunts the balance resistor when the main FET is turned on, and allows current flow through the balance resistor during a turn-off time of the main FET. The balance resistor modulates gate-source voltage of the main FET in order to compensate for gate-source threshold differences among the main FETs that could lead to unequal current sharing during the turn-off period. |
