# US 2014/0197970 A1 · Adapter circuit

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- Number: US 2014/0197970 A1
- Document ID: US20140197970A1
- Status: Published application
- Kind: A1
- Application number: 14/155,966
- Filed: 2014-01-15
- Published: 2014-07-17
- Earliest claimed: 2013-01-15
- Assignees: Hella KGaA Hueck & Co.
- Applicants: Hella KGaA Hueck & Co.
- Inventors: Bernhard Rupprath; Klaus-Peter Schmitz
- Web page: https://patentgrep.com/patent/US20140197970A1

## CPC

- H05B 45/382: with galvanic isolation between input and output
- B64F 1/20: Arrangement of optical beacons
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- B64F: GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

An adapter circuit for connecting a switching circuit of an airport visual aid is equipped with an LED as a light source and a secondary-side coil (secondary side) of a supply transformer, wherein at least one switch element is provided for selectively making or breaking the connection and wherein at least one trigger circuit is provided for actuating the switch element when a specified voltage level is exceeded, wherein the switch element is provided between the trigger, circuit and the secondary side of the supply transformer and/or the trigger circuit is connected to the switch contact and to the switching circuit of the LED airport visual aid.

## Claims

### Claim 1

An adapter circuit for connecting a switching circuit of an airport visual aid that is equipped with an LED as a light source and a secondary-side coil of a supply transformer, wherein at least one switch element is provided for selectively making or breaking the connection and wherein at least one trigger circuit is provided for actuating the switch element when a specified voltage level is exceeded, characterized in that the switch element is provided between the trigger circuit and the secondary side coil of the supply transformer and/or the trigger circuit is connected to the switch element and to the switching circuit of the LED airport visual aid.

### Claim 2 (depends on 1)

The adapter circuit according to claim 1, characterized in that a bistable relay with at least one switch contact and with a relay coil is provided for actuating the switch contact, wherein the switch contact acts as the switch element interacting with the trigger circuit, and wherein the connection of the switching circuit of the LED airport visual aid to the supply transformer is made in a closed state of the relay or is broken in an open state of this relay.

### Claim 3 (depends on 1)

The adapter circuit according to claim 1, characterized in that the trigger circuit comprises at least one rectifier diode connected to the switching circuit of the LED airport visual aid and a filter arrangement for filtering the current and voltage of the rectifier diode.

### Claim 4 (depends on 2)

The adapter circuit according to claim 2, characterized in that the bistable relay is constructed as a latching relay or as a locking relay or as a support relay.

### Claim 5 (depends on 2)

The adapter circuit according to claim 2, characterized in that the bistable relay has a control input for resetting the relay to the closed state.

### Claim 6 (depends on 2)

The adapter circuit according to claim 2, characterized in that the secondary side coil of the supply transformer and the switching circuit of the LED airport visual aid are connected in an electrically conductive way via two cables and two switch contacts are provided, wherein one switch contact is allocated to each cable and wherein the two switch contacts can be actuated by means of a common relay coil.

### Claim 7 (depends on 2)

The adapter circuit according to claim 2, characterized in that the trigger circuit and/or the bistable relay are installed in a common housing with the switching circuit for the LED airport visual aid.

### Claim 8 (depends on 1)

The adapter circuit according to claim 1, characterized in that a filter arrangement has a resistor and a capacitor connected in series with the resistor.

### Claim 9 (depends on 8)

The adapter circuit according to claim 8, characterized in that the relay coil is connected in parallel with the capacitor of the filter arrangement.