Patent ID: 6788195
Filing Date: 2004-09-07
Classification: B60Q

Abstract:
A monitor for a light circuit comprising a power source, a light being monitored, and a sense resistor, the monitor comprising:a) a first voltage amplifier circuit connected to the light circuit having a first output signal representing the voltage across the sense resistor; b) a second voltage amplifier circuit connected to the circuit having a second output signal representing the voltage across the sense resistor; c) a microprocessor configured to receive the output signals from the first and second voltage measuring circuits, said microprocessor being programmed to: (i) calculate the current to the light based on the first and second digital output signals; (ii) compare the calculated current against a threshold current; (iii) initiate a failure signal if the calculated current is less than the threshold current; and d) an indicator that activates if the microprocessor initiates a failure signal, whereby the activated indicator notifies that the light circuit is not operating correctly.