Voltage pulse to current regulating converter

G - Physics – 08 – B

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340/164, 354/97

G08B 1/08 (2006.01) G08C 19/02 (2006.01)

Patent

CA 1242019

- 10 - VOLTAGE PULSE TO CURRENT REGULATING CONVERTOR ABSTRACT OF THE DISCLOSURE A current regulating convertor includes a pulse generator which generates a voltage pulse train having a variable duty cycle. A low pass filter is connected to receive the pulse train and has a cutoff frequency which is well below the frequency of the pulse train. The low pass filter generates a D/C voltage signal which has a voltage level that is proportional to the duty cycle of the pulse train. The D/C signal is used in a circuit that draws a current from a power supply which is proportional to the voltage level of the D/C signal. The power supply is connected to the circuit by a 4-20 mA current loop. - 10 -

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