Pulsation control having pulse width modulating driving circuit
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United States of America Patent
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-
Dec 17, 1996
Grant Date -
N/A
app pub date -
Mar 2, 1995
filing date -
Mar 2, 1995
priority date (Note) -
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Abstract
A milking machine pulsation control includes a microcontroller which generates a pulse width modulated drive signal to control current to pulsator valves, with a high current for pull-in and a lower current for holding. The pulse width modulated drive signal is based on line voltage and compensated for supply frequency. A zero crossing circuit controls internal switching at zero volts to reduce noise. A watchdog circuit resets the computer in the event of latch-up as a result of circuit transients. An over-current shut-down circuit the switches that operate the valve. Synchronism is provided with other pulsation controls. Operator input switches and visual displays are multiplexed to the microcontroller.
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