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REDUCED POWER CONSUMPTION ELECTRONIC HEATING SYSTEM

IP.com Disclosure Number: IPCOM000005954D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-20
Document File: 1 page(s) / 46K

Publishing Venue

Motorola

Related People

Christopher R. Bach: AUTHOR

Abstract

Many electronic elements need to be held at a constant temperatumor maintain some miminum temperature to operate properly. A regulated heat source may need to be provided.

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MOTOROLA Technical Developments Volume 11 October 1990

REDUCED POWER CONSUMPTION ELECTRONIC HEATING SYSTEM

by Christopher R. Bach

Many electronic elements need to be held at a constant temperatumor maintain some miminum temperature to operate properly. A regulated heat source may need to be provided.

   The conventional approach would be to use a heating element with a control loop of some sort (Figure 1). This requires additional power to run the heating element. In this age of battery and solar power, the additional power con- sumption may not be tolerable. If the power already being dissipated within the equipment could be utilized, no addi- tional power would be required for temperature regulation.

   This circuit makes use of any heat dissipating device already present in the electronic equipment that can be split into multiple devices, for example a voltage regulator (Figure 2). One or more of the devices is physically removed from the others and used as a heating element. In order to control the temperature of this element the power split between it and the other devices is varied under control of a temperature sensor (Figure 3). In this manner heat can be provided where it is needed without additional power consumption in the electronic equipment. This circuit can be combined with a more conventional heater if additional BTU's are reauired.

Pass Device

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V out

Heating

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Temperature Controlled
1 Device 1

Figure 1 Figure 2

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