| 摘要 |
AC-to-AC power regulation circuits with power switch means in series with the line and load, the conduction period or angle of the power switch means being controlled to regulate the power output. Transistor type power switch means is turned on at zero current phase and turned off at the end of the desired conduction period. Capacitative line filtering is employed to minimize electromagnetic interference (e.m.i.), with marked weight reduction as compared with conventionally used inductive line filtering, rendering the circuits especially advantageous for aircraft use, such as for lamp dimmers, windshield temperature controllers, and aircraft AC power supplies in general. Bi-directional transistor type power switch means in circuits of the present invention, with proper bias, are inherently current-limiting and therefore can be operated into a short circuit load without damage to the power regulation circuit. Such power switch means, as contemplated by the invention, are power transistors, in contrast to conventionally used silicon controlled rectifiers (SCRs).
|
