load control device, lighting control user interface, control circuit for operating an electrical charge in response to a touch block output signal, manually operable control structure, and process for generating a operation of a resistive touch screen

摘要

LOAD CONTROL DEVICE, USER INTERFACE FOR ILLUMINATION CONTROL, CONTROL CIRCUIT FOR OPERATING AN ELECTRICAL LOAD IN RESPONSE TO A TOUCH BLOCK OUTPUT, MANUALLY CONTROLLABLE CONTROL SYSTEM, AND OPERATING PROCESS FOR MANUALLY FROM A TOUCH RESISTANT TOUCH SCREEN. A touch grader has a three-wire touch screen that produces an output voltage signal representative of a position of a manual pressure touch along a longitudinal axis of the touch screen. To reduce the occurrence of incorrect position indications, due to low pressure touches from the touch screen, a filter circuit is coupled to the touch screen output to avoid the detection of transient touches, and to avoid the detection of low touches. pressure having a lower driving force than a certain one. As a result, a controller can accurately determine the position of the manual pressure touch. In a preferred embodiment, two filters are coupled to the output of the touch screen. The first filter conditions the output voltage signal to allow the controller to accurately determine whether a manual pressure touch trigger has occurred. The second filter conditions the output voltage signal to let the controller accurately determine the position of the manual pressure touch along a longitudinal axis of the touch screen. An alternative embodiment of the touch grader uses a four-wire touch screen that produces a second output voltage signal representative of a hand pressure touch position along a transverse axis of the touch screen. The first filter is coupled to receive the second output signal to allow accurate detection of a manual pressure touch trigger.