Thermal system with a temperature limiting device
AssigneeWatlow Electric Manufacturing Company
InventorsMartin WALLINGER, Julian MICHELSEN
Life of this patent
Estimating the term…
Abstract
A thermal system includes a two-wire heater and a power switch. The power switch is to provide power to the two-wire heater from a power source based on a control signal. The thermal system includes a controller having a sensor circuit configured to measure an electrical characteristic of the two-wire heater. The controller is to calculate a temperature of the thermal system based on a change in the measured electrical characteristic and determine whether the temperature is greater than a temperature setpoint. The controller is to output the control signal based on the determination.
Claims20
A thermal system, comprising:
- a two-wire heater;
- a power switch configured to provide power to the two-wire heater from a power source based on a control signal;
- and
- a controller having a sensor circuit configured to measure an electrical characteristic of the two-wire heater, the controller configured to:
- calculate a temperature of the thermal system based on a change in the electrical characteristic;
- determine whether the temperature is greater than a temperature setpoint;
- and
- output the control signal based on the determination.
A thermal system, comprising:
- a two-wire heater;
- a load configured to be heated by the two-wire heater;
- a power switch configured to provide power to the two-wire heater from a power source based on a control signal;
- and
- a controller having a sensor circuit configured to measure an electrical characteristic of the two-wire heater, the controller configured to:
- calculate a temperature of the load based on a change in the electrical characteristic;
- determine the temperature is greater than a temperature setpoint;
- and
- output the control signal to turn-off power to the two-wire heater based on the temperature of the load being greater than the temperature setpoint.
A thermal system, comprising:
- a two-wire heater;
- a load configured to be heated by the two-wire heater;
- a power switch configured to provide power to the two-wire heater from a power source based on a control signal;
- and
- a controller having a sensor circuit configured to measure an electrical characteristic of the two-wire heater, the controller configured to:
- calculate a temperature of the two-wire heater and a temperature of the load based on a change in the electrical characteristic;
- determine at least one of the temperature of the two-wire heater and the temperature of the load is greater than a temperature setpoint;
- and
- output the control signal to turn-off power to the two-wire heater based on the at least one of the temperature of the two-wire heater and the temperature of the load being greater than the temperature setpoint.
Dependencies are inferred from the claim text.