METHOD OF CLOSING A RELAY SWITCH AND APPARTUS THEREOF

摘要

A load control device for controlling an amount of power delivered from an alternating current (AC) power source to an electrical load includes a relay operable to be coupled in series electrical connection between the AC power source and the electrical load. The relay has one or more relay contacts. The load control device includes a zero-cross detector operable to detect zero crosses of the alternating current and to generate zero cross signals, and a controller operatively coupled to a control input of the relay and the zero-cross detector for rendering the controllably conductive device conductive and non-conductive. The controller determines a relay actuation adjustment such that the contact reliably completes bouncing just prior to a zero cross and may initiate an actuation of the relay based on the actuation adjustment and the zero cross signal.

主权项

1. A load control device for controlling an amount of power delivered from an alternating current (AC) power source to an electrical load, the load control device comprising:
a relay operable to be coupled in series electrical connection between the AC power source and the electrical load, the relay having a contact; a zero-cross detector operable to detect zero crosses of the AC power source and to generate a zero cross signal; and a controller operatively coupled to a control input of the relay and the zero-cross detector for rendering the relay conductive and non-conductive, and operable to:
determine a relay actuation adjustment based on a sum of a relay-actuation delay associated with the relay and one and one half of an average relay contact-bounce duration associated with the relay; andinitiate an actuation of the relay based on the relay actuation adjustment and the zero cross signal.