| 摘要 |
<p>ENERGY CONSERVATION SYSTEM PROVIDING CURRENT CONTROL An electrical energy conservation control method and apparatus are provided which produce efficient regulation light output of either incandescent or fluorescent lamps or the outputs of other electrical load devices under circumstances where full output is not required. The control method and apparatus combines electronic (transistor) switching techniques with the use of reactive circuit components to provide control of the r.m.s. level of current flowing through the load device during the AC input voltage sine wave and to permit some current flow at all times during each voltage half wave. The control technique is non-dissipative in the sense that losses are virtually limited to switching transitions and passive circuit element losses. The control is accomplished by controlling the time period that a transistor is saturated full-on. The transistor is saturated on at the beginning of each voltage half wave and continues to be saturated on until the point in time within each half wave when the transistor is turned off. At that point in time, a non-dissipative current-limiting capacitor provides an alternate current path for the load current.</p> |
