Field device electronics fed by an external electrical energy supply
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Accused Products
Abstract
Field-device electronics including an electric current controller, through which a supply current flows. The electric current controller controls and/or modulates the supply current. The supply current is driven by a supply voltage provided by the external energy supply. Additionally, the field-device electronics has an internal operating and evaluating circuit for controlling the field device, as well as an internal supply circuit lying at a field-device electronics, internal input voltage derived from the supply voltage and feeding the internal operating and evaluating circuit. Provided in the supply circuit is a voltage controller flowed-through, at least at times, by a first component of the supply current. The voltage controller provides in the field-device electronics a first internal, useful voltage controlled to be essentially constant at a predetermined, first voltage level. Moreover, the supply circuit has a second voltage controller flowed through, at least at times, by a second current component of the supply current. The second voltage controller provides in the field-device electronics a second internal, useful voltage, which is variable over a predetermined voltage range. Also contained in the supply circuit is a voltage stabilizer flowed-through, at least at times, by a third current component of the supply current. The voltage stabilizer serves to set and maintain the internal input voltage of the field-device electronics at a predetermined voltage level. In accordance with the invention, the operating and evaluating circuit is flowed-through, at least at times, both by a first useful current driven by the first useful voltage, and by a second useful current driven by the second useful voltage.
34 Citations
48 Claims
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1-24. -24. (canceled)
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25. Field device electronics for a field device, fed by an external, electric energy supply, wherein the external electric energy supply provides a supply voltage (UV), especially a unipolar one, and delivers a variable supply current (I) driven thereby, especially a unipolar and/or binary supply current, which field-device electronics comprises:
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an electric current controller which a supply current (I) flows for adjusting and/or modulating, especially clocking, the supply current (I);
an internal operating and evaluating circuit for controlling the field device; and
an internal supply circuit feeding said internal operating and evaluating circuit and lying at an internal input voltage (Ue) of the field-device electronics derived from the supply voltage (UV), said internal supply circuit including;
a first voltage controller (UR1) through which, at least at times, an especially variable, first current component (I1) of the supply current (I) flows for providing in the field-device electronics a first internal, useful voltage (UN1) essentially controlled to be constant at a predeterminable, first voltage level (UN1 — desired), a second voltage controller through which, at least at times, an especially variable, second current component (I2) of the supply current (I) flows for providing in the field-device electronics a second internal, useful voltage (UN2) variable over a predeterminable voltage range, and a voltage stabilizer through which, at least at times, an especially variable, third current component (I3) of the supply current flows for adjusting and maintaining the internal input voltage (Ue) of the field-device electronics at a predeterminable voltage level, wherein;
said operating and evaluating circuit has flowing there through, at least at times, both by an especially variable, first useful current (IN1) driven by the first useful voltage (UN1) and by an especially variable, second useful current (IN2) driven by the second useful voltage (UN2). - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 48)
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38. A field-device for measuring and/or monitoring at least one specified physical and/or chemical parameter, especially a flow rate, density, viscosity, fill level, pressure, temperature, pH-value, or the like, of a medium, especially a medium conveyed in a pipeline and/or a container, comprising:
- field-device electronics having an electric current controller which a supply current (I) flows for adjusting and/or modulating, especially clocking, the supply current (I);
an internal operating and evaluating circuit for controlling the field device; and
an internal supply circuit feeding said internal operating and evaluating circuit and lying at an internal input voltage (Ue) of the field-device electronics derived from the supply voltage (UV), said internal supply circuit including;
a first voltage controller (UR1) through which, at least at times, an especially variable, first current component (I1) of the supply current (I) flows for providing in the field-device electronics a first internal, useful voltage (UN1) essentially controlled to be constant at a predeterminable, first voltage level (UN1— desired), a second voltage controller through which, at least at times, an especially variable, second current component (I2) of the supply current (I) flows for providing in the field-device electronics a second internal, useful voltage (UN2) variable over a predeterminable voltage range, and a voltage stabilizer through which, at least at times, an especially variable, third current component (I3) of the supply current flows for adjusting and maintaining the internal input voltage (Ue) of the field-device electronics at a predeterminable voltage level, wherein;
said operating and evaluating circuit has flowing there through, at least at times, both by an especially variable, first useful current (IN1) driven by the first useful voltage (UN1) and by an especially variable, second useful current (IN2) driven by the second useful voltage (UN2), as well as, electrically coupled with the field-device electronics, a physical-to-electrical, measurement transducer, which reacts to changes of the at least one parameter and issues, at least at times, at least one measurement signal (s1, s2) corresponding with the parameter, especially a measurement signal (s1, s2) in the form of a variable signal voltage and/or a variable signal current. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
- field-device electronics having an electric current controller which a supply current (I) flows for adjusting and/or modulating, especially clocking, the supply current (I);
Specification