Circuit for flashing fluorescent lamps

• US 6,570,346 B2
• Filed: 01/22/2001
• Issued: 05/27/2003
• Est. Priority Date: 01/21/2000
• Status: Expired due to Term

• Current Assignee: Sg Gaming, Inc. (Scientific Games Corporation)
• Original Assignee: Sierra Design Group (Scientific Games Corporation)
• Inventors: Incze, Attilla
• Primary Examiner(s): Philogene, Haissa
• Application Number:
  US09/767,673
• Publication Number:
  US 20010045802A1
• Time in Patent Office: 855 Days
• Field of Search: 315/200.A, 315/209.T, 315/291, 315/307, 315/209.R, 315/105, 315/106, 315/DIG.4, 315/DIG.5, 315/DIG.7
• US Class Current: 315/291
• CPC Class Codes: H05B 41/34 to provide a sequence of flashes
• CPC Class Codes: Y10S 315/04 Dimming circuit for fluorescent lamps

Abstract

A circuit for flashing a fluorescent lamp. The circuit includes a first and second terminal for coupling the circuit to a fluorescent lamp circuit. The terminals receive an AC power source. A switching circuit is coupled between the first and second terminals for switching the AC power source. An isolation circuit is coupled to the switching circuit. A control circuit is coupled to the isolation circuit. The control circuit controls the switching circuit in response to an external control signal. The circuit can flash higher power rated lamps or multiple lamps.

Claims

1. A flashing circuit for flashing at least one fluorescent lamp, the fluorescent lamp coupled in series with a ballast and connected across a source of AC power, the flashing circuit comprising:

(A) a control terminal for receiving a control signal;

(B) a control circuit coupled to the control terminal;

(C) an isolation circuit coupled to the control circuit, like isolation circuit comprising a photovoltaic isolator; and

(D) a switching circuit coupled to the isolation circuit and across the fluorescent lamp, the switching circuit comprising a first power transistor and a second power transistor, the first and second power transistors being connected in series and being adapted to turn the fluorescent lamp on and off in response to the control signal.

2. The circuit according to claim 1, wherein the control circuit comprises a transistor.

3. The circuit according to claim 1, wherein the first and second power transistors each have a gate, a source and a drain, the gates connected to the isolation circuit, the sources tied together and the drains connected across the lamp.

4. The circuit according to claim 3, wherein the circuit is mounted on a printed circuit board.

5. The circuit according to claim 4, wherein the circuit is located in a gaming device.

6. The circuit according to claim 1, wherein the switching circuit repeatedly turns on and off so as to cause the fluorescent lamp to flash.

7. The circuit according to claim 1, wherein the control terminal is coupled to a lamp regulator circuit.

8. The circuit according to claim 1, wherein the switching circuit comprises a triac.

9. The circuit according to claim 1, wherein the switching circuit comprises a relay.