Electromagnetic interference suppressing apparatus for high-frequency signal generation device

• US 8,134,845 B2
• Filed: 12/24/2007
• Issued: 03/13/2012
• Est. Priority Date: 12/31/2006
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Cheng, Ming
• Primary Examiner(s): Thompson, Timothy
• Assistant Examiner(s): Ng, Sherman
• Application Number:
  US12/521,165
• Publication Number:
  US 20100118506A1
• Time in Patent Office: 1,541 Days
• Field of Search: 361/818, 315/97, 315/277, 315/291, 315/219
• US Class Current: 361/816
• CPC Class Codes: H05B 41/02 Details
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

The present utility model relates to an electromagnetic interference suppressing apparatus for a high-frequency signal generation device. The high-frequency signal generation device includes an inverter means which is used for converting a direct current signal into a high-frequency alternating current signal, wherein the electromagnetic interference suppressing apparatus includes an electric conductor which is in capacitive or inductive coupling with the high-frequency signal generation device and is connected to the reference zero voltage point of the direct current signal. With the present utility model, the electromagnetic interference generated by the high-frequency signal generation device may be effectively suppressed in the case where a reliable earthing is not achievable. The present utility model relates also to an electronic ballast having the function of suppressing electromagnetic interference, and a fluorescent lamp of a compact type having the function of suppressing electromagnetic interference.

Claims

1. An electromagnetic interference suppressing apparatus for a high-frequency signal generation device, the high-frequency signal generation device comprising an inverter means which is used for converting a direct current signal into a high-frequency alternating current signal, wherein the electromagnetic interference suppressing apparatus includes an electric conductor which is in capacitive or inductive coupling with the high-frequency signal generation device and is connected to the reference zero voltage point of the direct current signal wherein said capacitive or inductive coupling allows the alternating current to pass through while insulating the direct current and allows the high frequency to pass through while blocking the low frequency and wherein the electric conductor is short-circuited to the reference zero voltage point of the high-frequency signal generation device and the interference voltage formed by the high-frequency interference signal together with the reference zero voltage point forms a loop circuit and is converted into an internal load of the high-frequency signal generation device.

2. The electromagnetic interference suppressing apparatus according to claim 1, wherein the electric conductor is a metal enclosure surrounding the high-frequency signal generation device.

3. The electromagnetic interference suppressing apparatus according to claim 1, wherein the high-frequency signal generation device is an electronic ballast for driving a gas discharge lamp in operation.

4. An electronic ballast system, comprising an electronic ballast and an electric conductor;

the electronic ballast including a rectifying means for converting a low-frequency alternating current signal into a direct current signal and an inverter means for converting the direct current signal into a high-frequency alternating current signal;

the electric conductor being disposed around the electronic ballast, coupled to the electronic ballast via a capacitor or an inductor and connected to the reference zero voltage point of the direct current signal, wherein said capacitor or inductor allows the alternating current to pass through while insulating the direct current and allows the high frequency to pass through while blocking the low frequency and wherein the electric conductor is short-circuited to the reference zero voltage point of the electronic ballast and the interference voltage formed by the high-frequency interference signal together with the reference zero voltage point, forms a loop circuit, and is converted into an internal load of the electronic ballast.

5. An energy-saving lamp of a compact type, comprising a lamp enclosure portion;

the enclosure portion being provided with an electronic ballast inside, and the electronic ballast including a rectifying means for converting a low-frequency alternating current signal into a direct signal and an inverter means for converting the direct current signal into a high-frequency alternating current signal;

the lamp enclosure portion including a metal enclosure inside, the metal enclosure being disposed between the electronic ballast and the lamp enclosure, coupled to the electronic ballast via a capacitor or an inductor and connected to the reference zero voltage point of the direct current signal in the electronic ballast wherein said capacitor or inductor allows the alternating current to pass through while insulating the direct current and allows the high frequency to pass through while blocking the low frequency and wherein the electric conductor is short-circuited to the reference zero voltage point of the electronic ballast and the interference voltage formed by the high-frequency interference signal together with the reference zero voltage point forms a loop circuit and is converted into an internal load of the electronic ballast.