Temperature Control Circuits

12/12/97 EDN-Design Ideas / temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply : 03/21/2002 EDN - Design Ideas / Fan noise is becoming a significant issue as electronic equipment increasingly enters the office and the home. Noise is proportional to fan speed, and the airflow hence, fan speed necessary for cooling is less at low ambient temperatures. Because ambient temperature is lower than the upper design point most of the time, a fan can run slower, making it easier on the ears.

Auto-Fan, automatic temperature control:

BangBang Heater:

BangBang Thermostat is Simple & Efficient: 11/06/97 EDN-Design Ideas

Boost Converter Controls 12 Volt Fan From 5 Volt Supply: 12/12/97 EDN-Design Ideas / Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply

Circuit Enables Precision Control In Radiant Heating Systems: 01/08/01 Electronic Design - Ideas for Design / Successful design of precision temperature-control loops, like all high-performance servo systems, depends on careful management of the usual feedback gain and bandwidth tradeoffs. While always tricky, these interactions can become unmanageable if the. . .

Circuit improves on temperature measurement: 05/02/2002 EDN - Design Ideas / When current pulses with a stable IHIGH/ILOW ratio modulate a semiconductor junction, the ensuing voltage difference (for example, ΔVBE for a bipolar transistor) is a linear function of the absolute (Kelvin) temperature, T. You can use this truism to make accurate temperature measurements. Technical literature has thoroughly covered the relationship (references 1 to 4) and has numerou....

Constant Temperature Circuit:

Controller Provides Closed Loop Temperature Regulation: 05/08/97 EDN-Design Ideas

Electronic Thermostat:

Electronic Thermostat Relay Circuit:

Heating System Thermostat:

LM3911 Temperature Controller:

Peltier Element Controls itself: 10/27/94 EDN-Design Ideas

Speed Control Handles Isolated –48 Volt Fans : 08/05/02 Electronic Design - Ideas for Design / Chips are available to monitor and control ventilation fans. But less common are fan controllers for telecom applications. Such fans must operate in electrically isolated environments with a supply voltage in the 36- to 72-V range. For example, the...

Take Back Half: A Novel Integrating Temperature-Control Algorithm: 12/04/00 Electronic Design - Ideas for Design / According to Linear Technology’s Jim Williams, “The unfortunate relationship between servo systems and oscillators is very apparent in thermal control systems.” (Linear Applications Handbook, 1990). High-performance temperature control is. . .

Temperature Controlled Based on AT89CX051:

Temperature Controlled NiCd Charger:

Temperature Controlled Ovens:

Temperature Controller: Remote sensor sends data via mains supply Temperature range:00.0 to 99.9 °C

Temperature controller :

Temperature Controller keeps IR Detector At 8ºK: 01/07/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Temperature Monitor: )

Temperature Programmer uses Digital Control: 07/18/96 EDN-Design Ideas

Temperature Regulator #2:

Temperature Sensitive Oscillator: Temperature controlled based on AT89CX051

Thermo Cooling Fan: fan controller, which controls fan based on temperature

Thermoelectric Controller (scriptable Thermometer):

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