The incandescent lamp(s) are placed in series with a MOSFET. Rather than applying a DC control circuit to the gate, I applied a variable duty cycle PWM signal. As the duty cycle increases, so does the average current through the lamps, so you get — in effect — an “adjustable load....
FIG. 4 is a software flow diagram for FIG. 2; FIG. 5 is an electric circuit for an infrared controlled incandescent lamp dimmer using a dedicated integrated circuit for triac control; FIG. 6 is an electric circuit for a software intensive infrared controlled incandescent lamp dimmer; FIG...
FIG. 1 is a simplified system block diagram of an incandescent lamp controller according to the invention; FIG. 2 is a graphic diagram of the voltages produced by the controller in FIG. 1; FIG. 3 is a more detailed block diagram of the controller in FIG. 1; and ...
The principle of amplitude limitation is illustrated by the diagram of Fig. 2, which shows the saturation characteristic of an electron tube. The working point P of the tube is so adjusted on principle that the peak values of the disturbances having an amplitude which exceeds a predetermined lim...
FIG. 2 is a simplified wiring diagram representation of the lamp structure of FIG. 1; FIG. 3 is an elevation, partly in section, of one embodiment of a fluorescent lamp useful in the lamp structure of FIG. 1; FIG. 4 is a volt-ampere characteristic curve, together with load line, for...
On the other hand, the present invention utilizes a secondary coil 15 to distribute the inductor load between two coils. Fewer turns per coil are necessary resulting in lower heat build-up and greater operating efficiencies. In certain lamp applications, a resistor 16 is necessary to be added...
The present invention provides an improved, yet relatively inexpensive, method for maintaining constant RMS voltage across an incandescent lamp load over a substantial range of source voltages. By relying primarily on the properties of passive components and closed loop control for the production the ...
A method and apparatus for switching an electrical load, such as an incandescent lamp, with a FET and providing protection for the FET. An exponential reference signal is generated which is a function
From the load resistance 35 of this diode the audio frequency can be taken off. The conductor 29 of the tube 15 is connected by means of the condenser 7 to the slow diode 6 (Fig. 3), which comprises a load resistance 8. The time constant determined by the condenser 7 and load ...
Accordingly, the LED dimming system is provided such that the perceived color shifting provided by the system does not begin until after a predetermined point on the dimming curve so as to imitate an incandescent lamp that is dimmed. Likewise, on the lower end of the dimming curve it is ...