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US 2014/0232369 A1Published application
Isolated data acquisition
AssigneeSiemens Industry, Inc.
InventorBRIAN HOGAN
Life of this patent
Estimating the term…
Abstract
A data acquisition circuit may isolate control and data decode logic elements from data acquisition elements such as sensors through the use of a single transformer. A control signal may be supplied to a primary winding of a transformer by alternately opening and closing a push switch and a pull switch. First and second analog to digital converter circuits may receive analog signals and convert them to data signals, which may appear on the secondary winding of the transformer. Data signals may be substantially received by a data demodulator circuit on the primary side of the data acquisition circuit. The data demodulator circuit may compare a voltage associated with the received signal to a threshold voltage and output a result of the comparison to the control and data decode logic element.
Claims21
A data acquisition circuit comprising:
- a transformer comprising a primary winding in communication with a primary side of the data acquisition circuit and a secondary winding in communication with a secondary side of the data acquisition circuit;
- a push switch on the primary side of the data acquisition circuit;
- a pull switch on the primary side of the data acquisition circuit;
- a control and data decode logic element connected on the primary side of the data acquisition circuit constructed and arranged to
- supply a control signal to the primary winding of the transformer by alternately opening and closing the push switch and the pull switch;
- and
- receive data;
- a first analog to digital converter circuit connected on the secondary side of the data acquisition circuit and arranged to receive a first analog signal and output a first data signal indicating that the first analog signal has been received to the secondary winding of the transformer;
- a second analog to digital converter circuit connected on the secondary side of the data acquisition circuit and arranged to receive a second analog, signal and output a second data signal indicating that the second analog signal has been received to the secondary winding of the transformer;
- and
- a data demodulator circuit connected on the primary side of the data acquisition circuit and arranged to
- receive a pull modulation signal from the primary winding of the transformer when the pull switch is closed, the pull modulation signal substantially comprising the first data signal;
- receive a push modulation signal from the primary winding of the transformer when the pull switch is closed, the push modulation signal substantially comprising the second data signal;
- compare a voltage associated with the push modulation signal to a threshold voltage and output a result of the push modulation comparison to the control and data decode logic element;
- and
- compare a voltage associated with the pull modulation signal to the threshold voltage and output a result of the pull modulation comparison to the control and data decode logic element.
13 more elements
A data acquisition method comprising:
- supplying, with a control and data decode logic element on a primary side of a data acquisition circuit, a control signal to a primary winding of a transformer by alternately opening and closing a push switch and a pull switch;
- receiving, with a first analog to digital converter circuit on a secondary side of the data acquisition circuit, a first analog signal;
- outputting, with the first analog to digital converter circuit, a first data signal indicating that the first analog signal has been received to a secondary winding of the transformer;
- receiving, with a second analog to digital converter circuit on the secondary side of the data acquisition circuit, a second analog signal;
- outputting, with the second analog to digital converter circuit, a second data signal indicating that the second analog signal has been received to the secondary winding of the transformer;
- receiving, with a data demodulator circuit on the primary side of the data acquisition circuit, a pull modulation signal from the primary winding of the transformer when the pull switch is closed, the pull modulation signal substantially comprising the first data signal;
- receiving, with the data demodulator circuit, a push modulation signal from the primary winding of the transformer when the push switch is closed, the push modulation signal substantially comprising the second data signal;
- comparing, with the data demodulator circuit, a voltage associated with the push modulation signal to a threshold voltage;
- outputting, with the data demodulator circuit, a result of the push modulation comparison to the control and data decode logic element;
- comparing, with the data demodulator circuit, a voltage associated with the pull modulation signal to a threshold voltage;
- and
- outputting, with the data demodulator circuit, a result of the pull modulation comparison to the control and data decode logic element.
9 more elements
Dependencies are inferred from the claim text.