| 摘要 |
It is proposed a system for measuring an output current Î OUT of a DC-to-DC converter, the DC-to-DC converter comprising a transistor power stage. The system comprises:
- a voltage measuring circuit, connected to the output of the power stage of the DC-to-DC converter, for measuring an average voltage drop V AVG ¹ on impedances R DS (P,N) of the transistors of the power stage;
- an impedance R composite , connected to an output of the voltage measuring circuit providing a current I OUT ¹ , the impedance R composite reproducing the impedances R DS (P,N) of the transistors of the power stage and being traversed by the current I OUT ¹ such that I ^ OUT = V AVG / G . k . R Composite = I OUT ¹ / G . k wherein G. k is a scaling ratio. |
