Combustion control apparatus

Claim 1

IN COMBINATION, A FLAME SENSOR HAVING RECTIFYING PROPERTIES, MEANS FOR APPLYING AN ENERGIZING SIGNAL TO SAID FLAME SENSOR, ELECTRIC CHARGE STORAGE MEANS CONNECTED IN CURCUIT WITH SAID FLAME SENSOR SO THAT CURRENT FLOW PRODUCED BY SAID SENSOR IN RESPONSE TO THE SENSING OF FLAME ACCUMULATES A CHARGE ON SAID STORAGE MEANS, AN ISOLATING CIRCUIT CONNECTED BETWEEN SAID FLAME SENSOR AND SAID CHARGE STORAGE MEANS INCLUDING A SERIES RESISTANCE CAPACITANCE CIRCUIT TO ENABLE DISTRIBUTED CAPACITANCE IN THE SENSOR CIRCUIT TO BE CHARGED RELATIVELY RAPIDLY, A SECOND RESISTANCE HAVING A HIGHER VALUE THAN THE RESISTANCE IN SAID SERIES CIRCUIT, SAID SECOND RESISTANCE BEING CONNECTED IN CIRCUIT BETWEEN SAID CHARGE STORAGE MEANS AND SAID SERIES CIRCUIT TO PROVIDE AN ISOLATING EFFECT OF A.C. SIGNALS APPLIED FROM SAID FLAME SENSOR ON SAID CHARGE STORAGE MEANS, A DISCHARGE CIRCUIT CONNECTED TO SAID CHARGE STORAGE MEANS INCLUDING VOLTAGE SENSITIVE MEANS HAVING FIRST AND SECOND IMPEDANCE STATES AS A FUNCTION OF THE VOLTAGE APPLIED THERETO, SAID VOLTAGE SENSITIVE MEANS BEING CONNECTED TO SAID CHARGE STORAGE MEANS TO SENSE THE ACCUMULATION OF ELECTRIC CHARGE BY SAID STORAGE MEANS, A LOW INPUT IMPEDANCE ELECTRONIC VALVE, MEANS TO APPLY A SIGNAL TO SAID ELECTRONIC VALVE IN RESPONSE TO THE CHANGING OF SAID VOLTAGE SENSITIVE MEANS FROM SAID FIRST IMPEDANCE STATE TO THE SECOND IMPEDANCE STATE IN RESPONSE TO THE ACCUMULATION OF CHARGE ON SAID STORAGE MEANS TO ACTUATE SAID ELECTRONIC VALVE, AND FLAME RELAY MEANS CONNECTED IN CIRCUIT WITH SAID ELECTRONIC VALVE TO PROVIDE AN INDICATION OF THE FLAME CONDITION IN THE SUPERVISED AREA WHEN SAID VALVE IS ACTUATED.