Process device with switching power supply
First Claim
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1. A process field device for coupling to a two wire process control loop, comprising:
- a field device circuitry;
a switching regulator configured to power the field device circuitry;
a bulk capacitance coupled to an input of the switching regulator configured to provide power to the switching regulator;
a series voltage regulator configured to provide a regulated supply voltage to the bulk capacitance; and
a noise filter configured to couple the series voltage regulator to the two wire process control loop to power the series voltage regulator with power from two wire process control loop and to block noise from the switching regulator from entering the two wire process control loop.
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Abstract
A process field device for coupling to a two wire process control loop includes a field device circuitry and a switching regulator to power the circuitry. A series regulator provides a regulated supply voltage to the switching regulator. A noise filter reduces the amount of noise from the switching regulator which enters the two wire process control loop.
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Citations
24 Claims
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1. A process field device for coupling to a two wire process control loop, comprising:
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a field device circuitry; a switching regulator configured to power the field device circuitry; a bulk capacitance coupled to an input of the switching regulator configured to provide power to the switching regulator; a series voltage regulator configured to provide a regulated supply voltage to the bulk capacitance; and a noise filter configured to couple the series voltage regulator to the two wire process control loop to power the series voltage regulator with power from two wire process control loop and to block noise from the switching regulator from entering the two wire process control loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of providing power to a circuitry of a field device in a two wire process control loop, comprising:
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receiving power from the two wire process control loop; preregulating the received power to a regulated voltage level; charging a bulk capacitance with the regulated voltage level; providing power to the circuitry of the field device with a switching regulator coupled to the bulk capacitance; and filtering noise from the switching regulator from entering the two wire process control loop. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification