1
Peter G Bartlett: Bus fault detector. Automation Systems, Woodard Weikart Emhardt & Naughton, March 10, 1981: US04255748 (35 worldwide citation)

The present invention comprises computer system equipment useful for detection of faults in data transmission within a computer system. Fault detection is accomplished by monitoring the current flow through a digital signal source means, which is characterized in that it only draws significant curre ...


2
Peter G Bartlett: Energy management apparatus and method. Automation System, Woodard Weikart Emhardt & Naughton, March 23, 1982: US04321477 (23 worldwide citation)

An energy management system for a group of electrical loads such as in an industrial plant. The electrical power usage by the group of loads is elastically maintained between an upper set point and a lower low limit point, which is a percentage of the set point, at all times. The electrical load dem ...


3
Peter G Bartlett: Output interface card suitable for use with a programmable logic controller. Automation Systems, Woodard Weikart Emhardt & Naughton, June 23, 1981: US04275455 (19 worldwide citation)

A programmable logic controller includes a plurality of input interfaces and a plurality of output interfaces for connection to industrial equipment such as automatic assembly equipment, textile machinery, materials handling equipment, and chemical processes. The input and output circuits can be ran ...


4
Peter G Bartlett: Transformer coupled isolation amplifier. Automation Systems, Woodard Weikart Emhardt & Naughton, November 23, 1982: US04360784 (17 worldwide citation)

A transformer-coupled isolation amplifier which has a minimally sized transformer, high common mode rejection, and a highly linear response over a wide dynamic range. A first chopper periodically alternates by 180.degree. the connection of the input through a high resistance to the primary of a smal ...


5
Peter G Bartlett: Programmable logic controller. Automation Systems, Woodard Weikart Emhardt & Naughton, December 11, 1979: US04178634 (11 worldwide citation)

A programmable logic controller includes a plurality of input interfaces and a plurality of output interfaces for connection to industrial equipment such as automatic assembly equipment, textile machinery, materials handling equipment, and chemical processes. The input and output circuits can be ran ...


6
Peter G Bartlett: Input converter. Automation Systems, Woodard Weikart Emhardt & Naughton, December 13, 1977: US04063121 (10 worldwide citation)

An input converter circuit for producing a logic level indication of the on or off condition of an input. The input may be AC or DC at any reasonable level. A bilateral photocoupler output is applied to an operational amplifier integrator, which establishes the integration time of the signal. The am ...


7
Peter G Bartlett: Digital computer having analog signal circuitry. Automation Systems, Woodard Weikart Emhardt & Naughton, February 12, 1985: US04499549 (8 worldwide citation)

A combination of a programmable logic controller with analog circuitry. The analog circuitry includes a summation point to which several items are coupled. Analog inputs are selectively coupled to the summation point through analog switches. Also, the output of a digital to analog converter couples ...


8
Peter G Bartlett: Step motor circuit. Automation Systems, July 14, 1981: US04278926 (5 worldwide citation)

A circuit which effectively prevents voltage spikes caused by leakage inductance of the step motor windings without otherwise interfering with the overall operation of the step motor. The circuit incorporates two windings between a common point and the positive supply and two other windings between ...


9
Peter G Bartlett: Two phase induction motor circuit with series connected center-tapped stator windings. Automation Systems, Woodard Weikart Emhardt & Naughton, November 29, 1983: US04418309 (4 worldwide citation)

An induction motor circuit which effectively prevents voltage spikes caused by leakage inductance of the induction motor stator windings without otherwise interfering with the overall operation of the induction motor. The circuit incorporates two windings between a common point and the positive supp ...


10
Peter G Bartlett: Electronic proximity sensor which is responsive to induced resistance. Automation Systems, Woodard Weikart Emhardt & Naughton, April 1, 1986: US04580097 (4 worldwide citation)

An improved electronic proximity sensor and crack detector that is primarily responsive to the induced resistance in a coil; including an LC resonating circuit that utilizes constant current and a DC power source. By sensing changes in the induced resistance, the invention detects various conditions ...



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