Current-voltage regulator

• US 5,973,936 A
• Filed: 12/17/1998
• Issued: 10/26/1999
• Est. Priority Date: 12/17/1997
• Status: Expired due to Term

• Current Assignee: Infineon Technologies AG
• Original Assignee: Siemens AG
• Inventors: Lenz, Michael, Schwertlein, Frank-Lothar
• Primary Examiner(s): NGUYEN, MATTHEW VAN
• Application Number:
  US09/213,725
• Time in Patent Office: 313 Days
• Field of Search: 363/15, 363/16, 363/73, 363/97, 363/131, 323/222, 323/266, 323/282, 323/285
• US Class Current: 363/15
• CPC Class Codes: G05F 1/46 wherein the variable actually regulated by the final control device is dc G05F1/625 takes precedence
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop

Abstract

The current-voltage regulator has a reference voltage source with an output. Two transconductance amplifiers each have two inputs and a current output. The current outputs of the transconductance amplifiers are coupled to one another and form an output of the current-voltage regulator. One of the inputs of the transconductance amplifiers is coupled to the output of the reference voltage source, and the other inputs of the transconductance amplifiers are driven, respectively, by a current sensor signal and a voltage sensor signal.

Claims

1. A current-voltage regulator, comprising:

a reference voltage source with an output;

a first transconductance amplifier with a first input, a second input, and a current output;

a second transconductance amplifier with a first input, a second input, and a current output;

said current outputs of said first and second transconductance amplifiers being coupled to one another and forming an output of the current-voltage regulator;

said first inputs of said first and second transconductance amplifiers being coupled to said output of said reference voltage source; and

said second input of said first transconductance amplifier being driven by a current sensor signal and said second input of said second transconductance amplifier being driven by a voltage sensor signal.

2. The current-voltage regulator according to claim 1, which further comprises two transistors coupling said current outputs of said first and second transconductance amplifiers to one another, said two transistors each having a collector terminal connected to a supply potential, a base terminal connected to a respective current output, and an emitter terminal connected to said output of the current-voltage regulator.

3. The current-voltage regulator according to claim 2, wherein said two transistors are Darlington transistors.

4. The current-voltage regulator according to claim 1, which further comprises a compensation network connected to each of said current outputs of said first and second transconductance amplifiers.

5. The current-voltage regulator according to claim 1, which further comprises a voltage limiting element connected to said current output of said first transconductance amplifier and a voltage limiting element connected to said current output of said second transconductance amplifier.

6. The current-voltage regulator according to claim 4, wherein at least one of said compensation networks includes a capacitor and a resistor connected between said current output of one of said first and second transconductance amplifier and said capacitor.

7. The current-voltage regulator according to claim 6, wherein said first input of one of said transconductance amplifiers is an inverting input and said second input is a noninverting input, and including a current sensor element having a first terminal connected to said noninverting input of said one transconductance amplifier and a second terminal, a first resistor connected between said second terminal of said current sensor element and said inverting input of said one transconductance amplifier, and a second resistor connected between said inverting input of said one transconductance amplifier and said output of said reference voltage source.