Apparatus and method for switch state detection and controlling electrical power

摘要

A device includes a connection receiving power from a power source under normal conditions and circuitry configured to determine, based on an input from the connection, when the power from the power source is absent; output, when the power source is absent, a test signal at the connection; and generate a detection signal based on current flow generated following the output of the test signal, wherein the detection signal indicates a position of a switch connecting the circuitry to the connection and the generated detection signal indicates the switch is closed when the current flow is above a threshold. The circuitry is configured such that when the power from the power source is absent, the switch is closed, and plural devices are connected on the supply side of the switch, the plurality of devices on the supply side appear as a substantially open circuit to the test signal.

主权项

1. A thermal servo device comprising:
circuitry configured to:
receive a temperature signal including data corresponding to a temperature of a battery, wherein the battery powers a first lighting circuit when power from a main power source of the first lighting circuit is absent, and wherein, a second lighting circuit connected on a load side of a switch connecting a main power connection to the main power source appears as a substantially open circuit to a test signal due to diodes in bridge rectifiers included in devices connected on the second lighting circuit;determine, based on the temperature signal, whether the battery temperature is greater than a predetermined threshold;generate, when the temperature is above the predetermined threshold, a control signal to keep the temperature of the battery below the predetermined threshold;determine, based on an input from the main power connection, when the power from the main power source is absent;output, based on the main power source being absent, the test signal at the main power connection; andgenerate a switch state detection signal based on current flow generated as a result of the output of the test signal, the switch state detection signal indicating a position of the switch, and wherein the switch state detection signal indicates the switch is closed based on the current flow being above a threshold.