Loop powered transmitter with a single tap data isolation transformer and unipolar voltage converters
First Claim
1. A loop-powered transmitter, comprising:
- a data isolation transformer including a primary winding and a secondary winding;
an analog-to-digital converter (ADC) to convert a sensor signal to a digital value, the ADC including a multi-signal interface; and
a first microcontroller coupled between the multi-signal interface of the ADC and only one tap of the primary winding of the data isolation transformer;
a second microcontroller coupled to a tap of the secondary winding of the data isolation transformer, the second microcontroller having a multi-signal interface output;
a digital-to-analog converter (DAC) having a digital input and a power input, the digital input connecting to the digital multi-signal interface output of the second microcontroller;
a second unipolar voltage converter coupled to a primary winding of a power isolation transformer and to the power input of the DAC.
1 Assignment
0 Petitions
Accused Products
Abstract
A loop-powered transmitter includes a data isolation transformer including primary and secondary windings and an analog-to-digital converter (ADC) to convert a sensor signal to a digital value. The transmitter also includes a first microcontroller coupled between a multi-signal interface of the ADC and only one tap of the primary winding of the data isolation transformer, and a second microcontroller coupled to the secondary winding of the data isolation transformer. The first microcontroller is configured to receive the digital value from the ADC over the multi-signal interface and to provide data indicative of the digital value via a single output data line through the tap of the primary winding of the data isolation transformer to the second microcontroller. Unipolar voltage converters may also be included in the transmitter along with a current limiting resistor for the data isolation transformer to reduce the risk of saturating the data isolation transformer.
30 Citations
22 Claims
-
1. A loop-powered transmitter, comprising:
-
a data isolation transformer including a primary winding and a secondary winding; an analog-to-digital converter (ADC) to convert a sensor signal to a digital value, the ADC including a multi-signal interface; and a first microcontroller coupled between the multi-signal interface of the ADC and only one tap of the primary winding of the data isolation transformer; a second microcontroller coupled to a tap of the secondary winding of the data isolation transformer, the second microcontroller having a multi-signal interface output; a digital-to-analog converter (DAC) having a digital input and a power input, the digital input connecting to the digital multi-signal interface output of the second microcontroller; a second unipolar voltage converter coupled to a primary winding of a power isolation transformer and to the power input of the DAC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A loop-powered transmitter, comprising:
-
a power isolation transformer; a data isolation transformer including a primary winding and a secondary winding; an analog-to-digital converter (ADC) configured to convert an analog signal to a digital value and to provide the digital value through the data isolation transformer; a first unipolar voltage converter to receive power through the power isolation transformer and to generate a unipolar operating power to operate the ADC; a current limiting resistor connecting the primary winding of the data isolation transformer to ground a first microcontroller coupled between the multi-signal interface of the ADC and only one tap of the primary winding of the data isolation transformer; a second microcontroller coupled to the tap of the secondary winding of the data isolation transformer, the second microcontroller having a multi-signal interface output; a digital-to-analog converter (DAC) having a digital input and a power input, the digital input connecting to the digital multi-signal interface output of the second microcontroller; and a second unipolar voltage converter coupled to a primary winding of the power isolation transformer and to the power input of the DAC. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
-
16. A loop-powered transmitter, comprising:
-
a data isolation transformer having a primary winding and a secondary winding, the primary winding having a tap; an analog-to-digital converter (ADC) having, an analog input lead and a digital multi-signal interface output and a power input; a first microcontroller connected to the digital output of the ADC and the tap of the primary winding; a power isolation transformer having a primary winding and a secondary winding; a first unipolar voltage converter coupled to the secondary winding of the power isolation transformer and the power input of the ADC; a second microcontroller coupled to the tap of the secondary winding of the data isolation transformer, the second microcontroller having a multi-signal interface output; and a digital-to-analog converter (DAC) having a digital input and a power input, the digital multi-signal interface output of the second microcontroller. - View Dependent Claims (17, 18, 19, 20)
-
-
21. A loop-powered transmitter, comprising:
-
a power isolation transformer having a primary winding and a secondary winding; a data isolation transformer having a primary winding and a secondary winding, the primary winding and the secondary winding of the data isolation transformer each having a tap; an analog-to-digital converter (ADC) having, an analog input lead and a digital multi-signal interface output and a power input; a first microcontroller connected to the digital output of the ADC and the tap of the primary winding of the data isolation transformer; a first unipolar voltage converter coupled to the secondary winding of the power isolation transformer and the power input of the ADC; a second microcontroller coupled to the tap of the secondary winding of the data isolation transformer, the second microcontroller having a multi-signal interface output; a digital-to-analog converter (DAC) having a digital input and a power input, the digital input connecting to the digital multi-signal interface output of the second microcontroller; and a second unipolar voltage converter coupled to the primary winding of the power isolation transformer and to the power input of the DAC. - View Dependent Claims (22)
-
Specification