Circuit assembly having a transformer with centre tapping and measuring of the output voltage

Patent metadata

Field	Value
Publication number	US-10379142-B2
Application number	US-201615556916-A
Country	US
Kind code	B2
Filing date	Mar 1, 2016
Priority date	Mar 9, 2015
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

To enable in a circuit arrangement ( 8 ) with a transformer with center tap the voltage measurement on the secondary side simply and safely, it is provided that at least two series-connected resistors (R 3 , R 4 ) are connected between the two outer connections (A 1 , A 2 ) of the secondary side of the transformer (T) to form a measurement point (P) between the two resistors (R 3 , R 4 ), and a voltage measurement unit (V) is provided to measure the voltage (U P ) between the measurement point (P) and the second output pole ( 13 ), which corresponds to the output voltage (U A ).

First claim

The invention claimed is:

1. A circuit arrangement comprising:
at least one transformer with center tap,
wherein, on a secondary side of the at least one transformer having two outer connections and a center point, the center point of the secondary side of the transformer is connected via a first output line to a first output pole and each of the two outer connections are connected via respective electrical circuit elements and a second output line to a second output pole,
a measurement apparatus for measuring an output voltage applied between the first output pole and the second output pole,
wherein at least two series-connected resistors are connected between the two outer connections and a measurement point is formed between the two resistors, and
a voltage measurement unit configured to measure a voltage between the measurement point and the second output pole, which corresponds to the output voltage.

2. The circuit arrangement according to claim 1 , wherein the electrical circuit elements and the two resistors are disposed on at least one substrate.

3. The circuit arrangement according to claim 1 , wherein the electrical circuit elements and the two resistors are disposed on a joint substrate.

4. The circuit arrangement according to claim 1 , further comprising at least one further resistor, which is connected between the measurement point and the second output pole.

5. A resonant converter with a resonant circuit and a circuit arrangement according to claim 1 .

6. The resonant converter according to claim 5 , wherein at least one capacitor each is connected in parallel to each of the electrical circuit elements.

7. A method for determining an output voltage between a first output pole and a second output pole, wherein the first output pole is connected to a center point of a secondary side of a transformer and the second output pole is connected to two outer connections of the secondary side of the transformer via electrical circuit elements,
measuring a voltage between a measurement point, formed between at least two series-connected resistors that are connected between the two outer connections, and the second output pole that corresponds to the output voltage.

8. The circuit arrangement according to claim 2 , wherein the at least one substrate is a printed circuit board.

9. The circuit arrangement according to claim 3 , wherein the joint substrate is a joint circuit board.

Assignees

• Fronius Int Gmbh

Inventors

• Magerl Christian
• Musil Franz Peter
• Eberl Robert
• Steinmaurer Friedrich

Classifications

• H05K2201/10166

  Transistor · CPC title

• B23K9/32

  Accessories · CPC title

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• G01R19/0084

  Measuring voltage only · CPC title

• G01R15/005 Primary

  Circuits for altering the indicating characteristic, e.g. making it non-linear · CPC title