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Sunday, September 5, 2010

Wheatston Bridge PWM Signal Conditioner Circuit

This is a schematic diagram of a Wheatston Bridge PWM Signal Conditioner circuit. This circuit uses the MAX1452 signal conditioner. A ratiometric compensated output for the Wheatstone Bridge is generated by the MAX1452. Then the output of the Wheatston bridge is converted to a PWM output. the PWM-output duty cycle changes accordingly, as the MAX1452 output changes with pressure. the analog-output signal-conditioning ASICs can be used to substitute the MAX1452. This is the figure of the circuit;

Frequency counter with pulse-width-measurement option is the instrument that use the circuit. It need an accurate measurement of the PWM output’s pulse width. Beside that, a microcontroller can use the PWM output and the controller’s internal timer to calculate the time interval between high-to-low and low-to-high transitions.  To calculate coefficients required to program the signal-conditioning IC, the measured PWM value can be used. [Circuit schematic source:]

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