Temperature controller

Claim 1

A CHROMATOGRAPHIC ANALYZER INCLUDING A CONTAINER IN WHICH CERTAIN OF THE COMPONENTS THEREOF ARE SITUATED, A HEATING DEVICE LOCATED IN SAID CONTAINER TO CONTROL THE TEMPERATURE THEREOF, A TEMPERATURE SENSING MEANS LOCATED IN SAID CONTAINER TO SENSE THE TEMPERATURE THEREOF, AN ELECTRONIC CONTROLLER CONNECTED WITH SAID TEMPERATURE SENSING MEANS AND SAID HEATING DEVICE TO CONTROL THE OUTPUT OF THE HEATING DEVICE IN RESPONSE TO SIGNALS FROM SAID TEMPERATURE SENSING DEVICE, THE IMPROVEMENT COMPRISING AN AMPLIFIER, FIRST MEANS CONNECTING THE TEMPERATURE SENSING MEANS WITH SAID AMPLIFIER, A PULSE CIRCUIT, MEANS CONNECTING THE AMPLIFIER, RATE OF SAID PULSE CIRCUIT, MEANS COUPLED WITH A SOURCE OF VOLTAGE FOR APPLYING SYNCHRONIZING PULSES TO SAID PULSE CIRCUIT, RECTIFIER MEANS, MEANS CONNECTING SAID RECTIFIER MEANS TO SAID PULSE CIRCUIT AND TO SAID SOURCE OF VOLTAGE WHEREBY SAID PULSE CIRCUIT CONTROLS THE OPERATION OF SAID RECTIFIER MEANS TO PROVIDE A VARIABLE OUTPUT VOLTAGE, MEANS CONNECTING SAID RECTIFIER MEANS WITH SAID HEATING DEVICE TO APPLY SAIS VARIABLE VOLTAGE TO SAID HEATING DEVICE. A NEGATIVE FEEDBACK CIRCUIT INCLUDING AN IMPEDANCE CONNECTED WITH SAID HEATING DEVICE AND SAID AMPLIFIER, AND SAID FEEDBACK CIRCUIT FURTHER INCLUDING A DIFFERENTIATING CIRCUIT HAVING A REACTIVE COMPONENT COUPLED WITH SAID IMEPEDANCE, SAID DIFFERENTIATING CIRCUIT OPERATING TO DIFFERENTIATE THE VOLTAGE FED BACK TO SAID AMPLIFIER BY SAID FEEDBACK CIRCUIT THEREBY PRODUCING LOW GAIN DURING CONTROLLER TRANSIENTS AND HIGH GAIN WHEN THE CONTROLLER OPERATION IS STABLE.