Bridge type phase detection device

• US 7,109,723 B2
• Filed: 09/29/2005
• Issued: 09/19/2006
• Est. Priority Date: 02/24/2005
• Status: Expired due to Fees

• Current Assignee: Logah Technology Corp.
• Original Assignee: Logah Technology Corp.
• Inventors: Hsu, Cheng-Chia, Wu, Teng-Ho, Chen, Ho-Wen, Chang, Teng-Kang
• Primary Examiner(s): Benson, Walter
• Application Number:
  US11/237,931
• Publication Number:
  US 20060186895A1
• Time in Patent Office: 355 Days
• Field of Search: 324/610, 324/770
• US Class Current: 324/610
• CPC Class Codes: H05B 41/2827 using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
• CPC Class Codes: H05B 41/2855 against abnormal lamp operating conditions

Abstract

A bridge type phase detection device comprises one or more than one transformer, a plurality of tubes, a voltage-detecting protection circuit and a first, second and third impedance, wherein a first tube of said plurality of tubes has a phase opposite to that of a second tube of said plurality of tubes, and a first end of said first impedance coupling with a secondary side of said transformer and a first end of said first tube, a first end of said second impedance coupling with said secondary side of said transformer and a first end of said second tube, then a second end of said first impedance connecting to a second end of said second impedance to form a detection point, said detection point coupling with said third impedance and said voltage-detecting protection circuit; said detection point having a voltage value derived from calculating a sum of said phase of said first impedance and that of said second impedance, then an output voltage divided among said first, two and third impedance, resulting in approximately zero voltage at said detection point during normal operation, if said voltage-detecting protection circuit detecting a non-zero voltage, it is concluded that a tube anomaly is present.

Claims

1. A bridge type phase detection device comprises an electronic switch, a PWM IC, one or more than one transformer, a plurality of tubes, a voltage-detecting protection circuit and a first, second and third impedance;

wherein a primary side of said transformer and said PWM IC coupling with said electronic switch, a secondary side of said transformer coupling with a first end of each one of said plurality of tubes, while a second end of each one of said plurality of tubes being grounded, and said voltage-detecting protection circuit coupling with said PWM IC;

said bridge type phase detection device is characterized in;

a first tube of said plurality of tubes has a phase opposite to that of a second tube of said plurality of tubes, and a first end of said first impedance coupling with said secondary side of said transformer and a first end of said first tube, a first end of said second impedance coupling with said secondary side of said transformer and a first end of said second tube, then a second end of said first impedance connecting to a second end of said second impedance to form a detection point, said detection point coupling with said third impedance and said voltage-detecting protection circuit;

said detection point having a voltage value derived from calculating a sum of said phase of said first impedance and that of said second impedance, said voltage-detecting protection circuit detecting said detection point and obtaining approximately zero voltage at said detection point during normal operation, if said voltage-detecting protection circuit detecting a non-zero voltage, it is concluded that a tube anomaly is present.

2. The bridge type phase detection device of claim 1, wherein the number of transformers is equal to that of tubes.

3. The bridge type phase detection device of claim 1, wherein a single transformer is used to drive said plurality of tubes.

4. The bridge type phase detection device of claim 1, wherein said first impedance, second impedance, and third impedance comprise one or more than one capacitor, respectively.

5. The bridge type phase detection device of claim 1, wherein said first impedance, second impedance comprise capacitors, while said third impedance comprises a capacitor and a resistor connecting in shunt configuration.

6. The bridge type phase detection device of claim 1, wherein said first impedance, second impedance, and third impedance comprise one or more than one resistor, respectively.

7. The bridge type phase detection device of claim 1, wherein said first impedance, second impedance and third impedance comprise one or more than one inductor, respectively.

8. The bridge type phase detection device of claim 1, wherein said first impedance, second impedance and third impedance are either capacitors or resistors, connected in a bridge mode.

9. The bridge type phase detection device of claim 1, wherein said first impedance, second impedance and third impedance are capacitors connected in a bridge mode.

10. The bridge type phase detection device of claim 1, wherein said tube is a U-shaped tube.