| 摘要 |
The storage time of a saturated transistor is reduced by connecting a low impedance current source or sink to the base of the transistor in response to a control pulse which turns the transistor off, to thereby increase the rate at which the excess minority carriers are removed from the base. The connection of the current source or sink to the base is provided by means of an inductor connected to the base terminal of the transistor and an auxiliary transistor that is actuated in response to the voltage across the inductor. A change of the current through the inductor produces a voltage transient across the inductor, which is applied to the base of the auxiliary transistor to turn it on. In turn, the auxiliary transistor connects the base of the main switching transistor to a current source or sink, depending on the type of transistor, to thereby increase the current flow into or out of the base region of the transistor, thus reducing its storage time. |
