Bus connection for connecting a field device to a field bus
AssigneeVEGA Grieshaber KG
InventorSiegbert Woehrle
Life of this patent
Estimating the term…
Abstract
A bus connection for connecting a field device to a field bus whereby the bus connection has a circuit for sending and receiving databus signals and for generating at least one regulated operating voltage, and the regulated operating voltage is generated from a bus voltage supplying the field bus, characterized in that a controllable resistor is provided for generating an additional operating voltage; circuitry means are provided, controlling the controllable resistor as a function of the bus voltage such that the input voltage of the circuit is regulated at its minimum required power supply voltage; and the sum of the regulated operating voltage and the additional operating voltage is supplied to the field device as the power supply voltage.
Claims12
A bus connection (1) for connecting a field device (2) to a field bus (3) whereby the bus connection (1) has a circuit (5) for sending and receiving databus signals (RxD, TxD, TRS) and for generating at least one regulated operating voltage (UA1), and the regulated operating voltage (UA1) is generated from a bus voltage (UBus) supplying the field bus (3),
- characterized in that a controllable resistor (T1) is provided for generating an additional operating voltage (UA2);
- circuitry means (OP, R1, R2, R3, R5, Z1, Z2) are provided, controlling the controllable resistor (T1) as a function of the bus voltage (UBus) such that the input voltage (UB) of the circuit (5) is regulated at its minimum required power supply voltage;
- and the sum of the regulated operating voltage (UA1) and the additional operating voltage (UA2) is supplied to the field device (2) as the power supply voltage (UA).
Dependencies are inferred from the claim text.