Circuit Arrangement Having a Transformation Apparatus and Operating Method for a Lamp Using a Circuit Arrangement Having a Transformation Apparatus

• US 20090140662A1
• Filed: 02/21/2007
• Published: 06/04/2009
• Est. Priority Date: 02/23/2006
• Status: Active Grant

• Current Assignee: OSRAM GmbH (Ams-Osram AG)
• Original Assignee: OSRAM GmbH (Ams-Osram AG)
• Inventors: Rupp, Arnulf, Schallmoser, Oskar, Dellian, Harald
• Granted Patent: US 8,193,722 B2
• Time in Patent Office: Days
• US Class Current: 315/276
• CPC Class Codes: H05B 41/042 using semiconductor devices

Abstract

The present invention relates to a circuit arrangement having a transformation apparatus, which has a primary side (P) and a secondary side (S), wherein the primary side and the secondary side (S) are DC-isolated from one another, wherein the primary side (P) has a terminal for a supply voltage (UE) and is connected to a first reference potential, wherein the secondary side (S) comprises a first and a second output line, which, in the normal case, are not coupled to a reference potential and which form an output terminal, at which a voltage for a load (LA) can be provided, wherein it furthermore comprises: an apparatus for tapping off a measured voltage potential (CP) on the secondary side (S); and an apparatus (10) for determining whether the measured voltage potential is in a permissible range. The invention moreover relates to an operating method for a lamp using a circuit arrangement.

Claims

1. A circuit arrangement having a transformation apparatus, which has a primary side (P) and a secondary side (S), the primary side and the secondary side (S) being DC-isolated from one another, the primary side (P) having a terminal for a supply voltage (U_E) and being connected to a first reference potential, the secondary side (S) comprising a first output line and a second output line, which lines are normally not DC-coupled to a reference potential and form an output terminal, at which a voltage for a load (LA) can be provided, characterized in that it furthermore comprises:

an apparatus for tapping off a measured voltage potential (C_P) on the secondary side (S); and

an apparatus (10) for determining whether the measured voltage potential is in a permissible range.

2. The circuit arrangement as claimed in claim 1, characterized in that the determination apparatus (10) is designed to evaluate the amplitude of and/or the change over time in the measured voltage potential (P1).

3. The circuit arrangement as claimed in claim 1, characterized in that the measured voltage potential is a potential on the secondary side which is changed by the first output line (AL1) and/or the second output line (AL2) being coupled to a second reference potential.

4. The circuit arrangement as claimed in claim 3, characterized in that the second reference potential represents

the first reference potential, or

a ground connection, or

a 0 V line, or

the housing, in particular the backplate, of the circuit arrangement or of the lamp.

5. The circuit arrangement as claimed in claim 1, characterized in that the secondary side has a measurement point (P1), in particular a point of symmetry, the potential (P1) at the measurement point representing the measured voltage potential.

6. The circuit arrangement as claimed in claim 5, characterized in that the transformation apparatus comprises a transformer, the measurement point whose potential forms the measured voltage potential representing the point of symmetry of the secondary side (S) of the transformer.

7. The circuit arrangement as claimed in claim 5, characterized in that the secondary side has a voltage divider, in particular a capacitive voltage divider, which is coupled between the first output line and the second output line, the potential at the tap of the voltage divider representing the measured voltage potential.

8. The circuit arrangement as claimed in claim 1, characterized in that the apparatus for tapping off the measured voltage potential comprises a capacitor (C_P).

9. The circuit arrangement as claimed in claim 8, characterized in that the circuit arrangement comprises a printed circuit board, the capacitor being in the form of a plate capacitor (C_P) and being formed by two metal pads, in particular by two copper pads, of which in each case one is formed on the top and the bottom side of the printed circuit board.

10. The circuit arrangement as claimed in claim 9, characterized in that the plate capacitor (C_P) has a capacitance of less than or equal to 50 pF, preferably of less than or equal to 10 pF.

11. The circuit arrangement as claimed in claim 1, characterized in that the voltage (UA) which can be provided during operation of the circuit arrangement at the output terminal of the circuit arrangement is greater than or equal to 1000 V.

13. circuit arrangement as claimed in claim 2, characterized in that the measured voltage potential is a potential on the secondary side which is changed by the first output line (AL1) and/or the second output line (AL2) being coupled to a second reference potential.

14. The circuit arrangement as claimed in claim 2, characterized in that the secondary side has a measurement point (P1), in particular a point of symmetry, the potential (P1) at the measurement point representing the measured voltage potential.

15. The circuit arrangement as claimed in claim 2, characterized in that the apparatus for tapping off the measured voltage potential comprises a capacitor (C_P).

16. The circuit arrangement as claimed in claim 2, characterized in that the voltage (U_A) which can be provided during operation of the circuit arrangement at the output terminal of the circuit arrangement is greater than or equal to 1000 V.

12. An operating method for a lamp using a circuit arrangement having a transformation apparatus, which has a primary side (P) and a secondary side (S), the primary side (P) and the secondary side (S) being DC-isolated from one another, the primary side (P) having a terminal for a supply voltage (U_E) and being connected to a first reference potential, the secondary side (S) comprising a first output line and a second output line, which are normally not coupled to a reference potential and which form an output terminal, at which a voltage for a load (LA) can be provided, characterized by the following steps:

a) tapping off a measured voltage potential (C_P) on the secondary side (S); and

b) determining whether the measured voltage potential is in a permissible range.