Drive A Resistive Heater Element Without Adding Noise To The System

Focus:

A low-frequency PWM voltage source drives a resistive heater at power levels up to approximately 25 W without adding much noise to the system. Heat output varies directly with PWM duty cycle. This three-transistor circuit features pulse-by-pulse current limiting. (PWM signal is generated separately.)

What you’ll learn:

• How to build a low-noise drive circuit for a resistive heater

Notes:

ED's Ideas For Design

View the Source

Author & Publication:

James Henden, principal engineer, New Wave Research, Fremont, Calif., Electronic Design, Sep 01 2007

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