Adaptive load circuit

摘要

The present subject matter is directed to an adaptive load circuit for use with traffic light control systems so as to permit operation using low current consumption lamps where the traffic light control systems were originally manufactured for operation with higher current consuming lamps. The adaptive load circuit provides a mechanism whereby an existing traffic light control system is fooled into accepting use of a low current consuming lamp by creating a specifically timed signal during an interval that the traffic light control system normally checks to determined lamp load characteristics.

主权项

1. An adaptive load circuit configured to enable use of low power consumption loads with an apparatus, the apparatus comprising a traffic light controller configured to periodically test for power consumption of the apparatus based on an input timing signal, the adaptive load circuit comprising:
a command transfer circuit configured to produce a signal synchronized with the input timing signal; a switch coupled to the command transfer circuit and configured to receive the signal from said command transfer circuit, the signal configured to periodically activate the switch; a circuit power coupled to the switch; and a load coupled to the switch, the switch configured to couple the circuit power to the load when the switch is periodically activated, wherein activation of the switch by the signal causes said switch to connect said load and increase a power consumption detected by the traffic light controller.