Remote feeding device

• US 6,172,491 B1
• Filed: 07/08/1996
• Issued: 01/09/2001
• Est. Priority Date: 10/30/1993
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Nathan, Adolf
• Primary Examiner(s): VU, BAO Q
• Assistant Examiner(s): VU, BAO Q
• Application Number:
  US08/640,754
• Time in Patent Office: 1,646 Days
• Field of Search: 323/273-277, 323/268, 323/271, 323/282, 323/283, 323/284, 323/285
• US Class Current: 323/282
• CPC Class Codes: G05F 1/569 for protection
• CPC Class Codes: H04B 3/44 Arrangements for feeding power to a repeater along the transmission line

Abstract

In connection with remote feeder devices it is often necessary to take steps not to exceed limit values, for example the maximally permissible contact voltage.

Customary voltage limiters evaluate the voltage at the output terminals of the remote feeder device. The remote feeder current can be distorted by the evaluation.

With the invention, a dynamic resistor (V1, V2) is provided at the base point of the voltage limiter (BU), which can be set in such a way that the voltage drop at the remote feeder current regulator (RI) can be compensated.

The range of the remote feeding or the distance between the intermediate current regenerators can be increased by means of the steps of the invention.

Claims

1. A remote feeder device comprising:

a supply voltage source;

output terminals;

a remote feeder current regulator having a current sensor;

a voltage limiter connected with said supply voltage source for limiting a remote feeder voltage to a maximum value;

an adjustable dynamic resistor which is connected in series with said voltage limiter associated with said remote feeder current regulator, said dynamic resistor having a base point which is connected with said current regulator and being adjustable so that its voltage drop corresponds to a voltage drop at said current sensor, said current sensor of said remote feeder current regulator being located between one of said output terminals and said dynamic resistor, said dynamic resistor having a terminal which is connected to said supply voltage source, said dynamic resistor also having a control connector which is in operative connection with said current sensor leading to one of said output terminals; and

evaluating means provided for said voltage limiter and located on an opposite side of said current sensor of said remote feeder current regulator from said output terminals.

2. A remote feeder device as defined in claim 1, wherein said dynamic resistor is adjustable so that its voltage drop corresponds to a voltage drop of said remote feeder current regulator.

3. A remote feeder device as defined in claim 1, wherein said dynamic resistor has at least one control transistor which is controllable as a function of the voltage drop at said current sensor of said remote feeder current regulator.

4. A remote feeder device as defined in claim 1, wherein said current sensor includes a current measuring resistor.

5. A remote feeder device as defined in claim 1, wherein said current sensor includes a transducer.

6. A remote feeder device as defined in claim 1, wherein the voltage drop at said current sensor is evaluatable for a current regulation of the remote feeder device.

7. A remote feeder device as defined in claim 1, and further comprising a switching regulator connected downstream of said supply voltage source and having a transistor with a conducting time which is adjustable as a function of an output signal of said remote feeder current regulator.

8. A remote feeder device as defined in claim 1;

and further comprising a switching regulator connected downstream of said supply voltage source and having a transistor with a conducting time which is adjustable as a function of an output signal of said voltage limiter.

9. A remote feeder device as defined in claim 8, wherein the conducting time of said transistor of said switching regulator is also adjustable as a function of an output signal of said remote feeder current regulator.