Electric heating – Heating devices – With protective means for heater
Patent
1996-11-08
1998-06-23
Paschall, Mark H.
Electric heating
Heating devices
With protective means for heater
219212, 219505, 219517, 361 87, H05B 102
Patent
active
057708363
ABSTRACT:
A safety-assuring control device for an electric blanket which includes a PTC heater includes an integrated circuit microcontroller unit having first and second safety circuit inputs and an output connected to a control input of an electrically controlled heater switch. A neon tube is connected between the primary safety link return conductor of the heater and the first safety circuit input, to indicate whether there is a first type of fault in the PTC heater. A connection between the second safety circuit input and the secondary safety link return conductor of the PTC heater is provided which indicates whether there is a second type of fault in the heater. The microcontroller unit includes a preliminary fault detection circuit for supplying a limited power test signal in a test mode to the heater for a predetermined period of time prior to a full power operation of the heater. The microcontroller unit also includes a circuit for controlling operation of the microcontroller unit to terminate supply of current to the heater if at least one fault is detected by the microcontroller at least one of the first and second safety circuit inputs during the predetermined period of time, and for controlling operation of the microcontroller unit to supply current to the heater in the full power operation if no fault is detected during the predetermined period of time.
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Micro Weiss Electronics
Paschall Mark H.
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