Infant warming assembly with radiant heater and heater surface temperature sensor
An infant warming assembly includes a heater assembly having a heater surface temperature sensor, a skin temperature sensor, and a user interface to input a commanded skin temperature value. The skin temperature sensor and the commanded skin temperature value are used in controlling a temperature component of a control loop. The heater surface temperature sensor is used in controlling a power component of the control loop that powers the heater based at least in part upon the heater surface temperature sensor and a control signal from the temperature component.
1. A radiant heater apparatus structured for use in an infant warming assembly, the radiant heater apparatus comprising:
a radiant heater comprising a heater element and a heater surface temperature sensor disposed on the heater element, the heater surface temperature sensor being structured to sense a current heater surface temperature;
a radiant heater control apparatus that comprises a processor apparatus and a control loop;
the processor apparatus having a number of routines executed thereon that comprise a user interface routine which enables the setting of a commanded skin temperature value;
the control loop comprising a temperature component and a power component;
the temperature component comprising a skin temperature sensor, a bed temperature controller, and a heater surface temperature lookup, the skin temperature sensor being structured to sense a current skin temperature, the bed temperature controller being structured to generate a bed temperature control signal based at least in part upon the commanded skin temperature value and the current skin temperature, the heater surface temperature lookup being structured to generate a commanded heater surface temperature value based at least in part upon the commanded skin temperature value, the temperature component being structured to generate a heater surface temperature control signal based at least in part upon the bed temperature control signal and the commanded heater surface temperature value;
the power component comprising a heater power controller and a heater power lookup, the heater power controller being structured to generate a heater power control signal that is based at least in part upon the heater surface temperature control signal and the current heater surface temperature, the heater power lookup being structured to generate a commanded heater power value that is based at least in part upon the commanded skin temperature value; and
the radiant heater being structured to be powered based at least in part upon the heater power control signal and the commanded heater power value.
2. An infant warming assembly employing the radiant heater apparatus of claim 1 .