Pulsation control having pulse width modulating driving circuit

Details Pulsation control having pulse width modulating driving circuit Pulsation control having pulse width modulating driving circuit

1995-03-02

1996-12-17

Manahan, Todd E.

Animal husbandry

Milkers

With fluid compression

119 1429, A01J 5007, A01J 514

Patent

active

055842623

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.

REFERENCES:
patent: 3703645 (1972-11-01), Swift
patent: 4011838 (1977-03-01), Nordegren et al.
patent: 4399483 (1983-08-01), Phelan
patent: 4690099 (1987-09-01), Gregan et al.

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