| 摘要 |
A low maintenance emergency power supply which operates for a sufficient period to send an alarm to a remote location in the event of a power failure. The emergency power supply has particular application with traffic signal controllers. In the event of a primary power failure a traffic signal controller has insufficient time to transmit a signal to a central monitoring location that a power outage has occurred. Personnel monitoring the traffic controller from the central location do not know if the controller has lost power or if the communications line between the controller and central monitoring location has been lost. The emergency power supply comprises: a capacitor to store power, and, a voltage regulator connected serially to the capacitor output to maintain a constant output. In the event of a primary power failure a constant voltage is maintained for a sufficient period to transmit an alarm signal. In one aspect of the invention the emergency power supply is devised to receive an output from an existing power supply and plug into the power input of an existing traffic signal controller.
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