Temperature detection and control system for layered heaters

摘要

A system for detecting and controlling temperature of a layered heater is provided that includes a layered heater having in one form a substrate, a first dielectric layer disposed on the substrate, a sensor layer disposed on the first dielectric layer, a second dielectric layer disposed on the sensor layer, a resistive heating layer disposed on the second dielectric layer, and a third dielectric layer disposed on the resistive heating layer. An overtemperature detection circuit is provided in one form that is operatively connected to the resistive heating layer. The circuit includes a resistor, the sensor layer, and an electromechanical relay in parallel with the sensor layer. The sensor layer defines a material having a relatively high TCR and the resistive heating layer defines a material having a relatively low TCR such that a response time of the control system is relatively fast.

主权项

1. A system for detecting and controlling temperature of a layered heater comprising:
a layered heater comprising:
a substrate;a first dielectric layer disposed on the substrate;a sensor layer having a sensor termination and disposed on the first dielectric layer;a second dielectric layer disposed on the sensor layer;a resistive heating layer having a heater termination and disposed on the second dielectric layer; anda third dielectric layer disposed on the resistive heating layer; and an over temperature detection circuit operatively connected to the resistive heating layer comprising:
a resistor;the sensor layer; andan electromechanical relay in parallel with the sensor layer, wherein the sensor layer defines a material having a relatively high TCR and the resistive heating layer defines a material having a relatively low TCR such that a response time of the control system is less than about 1 second.