Current supply device for series-fed electronic circuits

Claim 2

A current supply device for a series-fed electronic consumer circuit, said supply device comprising: input and output terminals for the feed current; a Zener diode and a charging capacitor connected in parallel across said terminals; a rectifying diode and a charging resistor connected in series to said input terminal between said charging capacitor and said Zener diode; and a regulating device having a first controllable impedance connected between said consumer circuit and said charging capacitor, a second controllable impedance connected in parallel with said consumer circuit, and a regulating means for controlling said first and second controllable impedances for maintaining the voltage across said consumer circuit constant.

Claim 3

A current supply device as claimed in claim 1 wherein said regulating device is operable as a backwards regulating device.

Claim 4

A current supply device as claimed in claim 1 wherein said regulating device is operable as a combined backwards-forwards regulating device.

Claim 5

A current supply device as claimed in claim 1 wherein said regulating means is a single common regulator connected to each of said first and second controllable impedances.

Claim 6

A current supply device as claimed in claim 4 wherein said controllable impedances are transistors and the non-inverting input of said differential amplifier is connected to a reference voltage source, said current supply device further comprising: an ohmic voltage divider connected across said consumer circuit, the inverting input of said differential amplifier being connected to a node of said voltage divider; an additional Zener diode connected between the output of said differential amplifier and the control electrode of said first controllable impedance; said output of said differential amplifier being also connected to the control electrode of said second controllable impedance; and said second controllable impedance being complimentary to said first controllable impedance.

Claim 7

A current supply device as claimed in claim 5 wherein said second controllable impedance is a Darlington transistor arrangement.

Claim 8

A current supply device as claimed in claim 5 wherein said reference voltage source comprises a plurality of series-connected resistors connected across said consumer circuit and a Zener diode connected in parallel across a portion of said plurality of resistors.

Claim 9

A current supply device as claimed in claim 5 further comprising a voltage balancing circuit for producing two equal voltages connected in parallel across said consumer circuit and having a balancing circuit regulator means connected to said reference voltage source.

Claim 10

A current supply device as claimed in claim 8 wherein said balancing circuit regulating means is a further differential amplifier having a non-inverting input connected to said reference voltage source.

Claim 11

A current supply device as claimed in claim 8 wherein the output of said balancing circuit regulating means is connected to a first balancing circuit controllable impedance and is connected through an additional rectifying diode to a second balancing circuit controllable impedance, the outputs of said balancing circuit controllable impedances being connected at a node functioning as a reference terminal for said two equal voltages.

Claim 12

A current supply device as claimed in claim 10 wherein said first and second balancing circuit controllable impedances are each Darlington transistor arrangements.

Claim 13

A current supply device as claimed in claim 1 wherein said controllable impedances are transistors.

Claim 14

A current supply device as claimed in claim 11 wherein said trasistors are are bipolar transistors.

Claim 15

A current supply device as claimed in claim 12 wherein said transistors are field effect transistors.

Claim 16

A current supply device as claimed in claim 1 wherein said device is connected in a transmission link for supplying current to intermediate amplifiers for digital signals.