| 摘要 |
<p>The circuit includes a first switching transistor (Q3) which is actuated by a logic signal. This switching transistor (Q3) is disposed in a current path from the base of the power transistor (Q9). When this switch (Q3) is actuated, there is provided a large steady state base drive current superimposed with a base current peaking pulse from a current generator. The circuit also includes a second switch (Q1) which applies a reverse potential to the base of the switching transistor (Q9) for fast turnoff. The specific embodiments disclose circuitry for regulating forward base drive current to minimize line voltage variations and component tolerances. An improved bipolar power transistor base drive circuit for switching regulator and DC to DC converter power supplies is disclosed. </p> |
