CN1189286A - Circuit arrangement - Google Patents
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- CN1189286A CN1189286A CN97190370A CN97190370A CN1189286A CN 1189286 A CN1189286 A CN 1189286A CN 97190370 A CN97190370 A CN 97190370A CN 97190370 A CN97190370 A CN 97190370A CN 1189286 A CN1189286 A CN 1189286A
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Abstract
The invention relates to a circuit arrangement for igniting and operating a discharge lamp, provided with input terminals for connecting a supply source, and a ground terminal; differential-mode and common-mode filter means in which are incorporated inductive means and capacitive filter means; output terminals for connecting the discharge lamp; and a switch mode power supply connected to the input terminals and the output terminals by means of respective voltage conduction branches. According to the invention, the circuit arrangement is characterized in that the input terminals and output terminals are connected both to one another and to the ground terminal by means of respective capacitive filter means, in that a bead is included in one of the voltage conduction branches, and in that further common-mode capacitive means are present between the inductive means and the switch mode power supply. The requirements formulated in both EN55022 and EN55015 can be complied with in this manner.
Description
The present invention relates to be used to start and move the circuit of discharge lamp, have
-be used for connecting first and second inputs of power supply, and earth terminal,
-difference and common mode filtering device wherein are equipped with inductance element and capacity cell,
-respectively by first and second conductive branch be connected to first and second inputs switch attitude power supply and,
-being used for connecting first and second outputs of discharge lamp, output is connected to switch attitude power supply by third and fourth conductive branch respectively.
What such circuit was known in the production of Philips company is HF-B TLD and the HF-P TLD type electric ballast that startup and operation fluorescent lamp design, and being applicable to of Philips company production starts and the operation high-pressure discharge lamp, especially metal halide lamp, EMC025-S01 type ballast.
Filter is used for guaranteeing that ballast satisfies the designing requirement of known EN55015.The quantity of the interference signal that it realize to take place by following manner, particularly from 9kHz in the 30kHz frequency range, remain on low maximum allowable level under given conditions.
Inductance element in the known ballast comprises first and second coils that intercouple, and lays respectively in first and second conductive branch, forms an inductance as the difference coil that co-mode coil separates with.The inductance that separates can be used as the self-inductance of separation, is arranged in a conductive branch.Technical equivalent is to form an embodiment that is distributed in two coils that intercouple in two conductive branch.The capacitor filtering device comprises a differential capacitor between co-mode coil and difference coil that connects first and second conductive branch, and it also forms series circuit with a common mode capacitance device that forms the partition capacitance filter simultaneously.The common mode capacitance device is formed up to the contact between small part inductance element and the earth terminal.Differential capacitor and common mode inductance form difference filter, and common mode capacitance device and co-mode coil form common-mode filter.Common mode capacitance device in the known circuit is formed by a single capacitor.The capacitor filtering device can also be formed by two capacitors, and each all is connected to earth terminal, and while first and second conductive branch are connected respectively in two capacitors.
Though the filter of known ballast comprises a good measure and satisfies above-mentioned requirements, finds to utilize this device can not make the also satisfied requirement according to the interference allowance of EN55022 in the frequency range from 30MHz to 1GHz of circuit.This is a problem.The present invention provides the measure of eliminating this problem for this purpose.
According to the present invention, this class circuit of mentioning in the beginning paragraph is for this purpose, it is characterized in that input and output are connected with each other by the capacitor filtering device and are connected to earth terminal, it is characterized in that one in the conductive branch comprises bead, the common mode capacitance element that its feature also is to add is between inductance element and switch attitude power supply.
Being surprisingly found out that between input and output and ground that the combination of bead and electric capacity connector makes satisfies the EN55022 requirement and becomes possibility, and Fu Jia common mode capacitance device guarantees that also the standard of EN55015 still satisfies simultaneously.Preferably, be coupled with the leakage of first and second conductive branch respectively by first and second coils and construct inductance element.Therefore coupling inductance and additional common mode capacitance element form together and partly are used for the common-mode filter of 9kHz to the 30MHz frequency range, and leakage inductance forms the part difference filter simultaneously.
Bead is not specially adapted to reduce interference signal under high frequency situations owing to it has parasitic capacitance basically.The bead that is specially adapted to high frequency filter is the ferrite pearl, and it has higher ohmage at 30MHz to the 1GHz frequency range.It is favourable settling two beads when high-frequency range operation difference filter, and wherein bead is arranged in the different different conductive branch of polarity each other.
This circuit has and is used for to starting the start-up circuit that high-pressure discharge lamp generates the starting resistor pulse.This circuit has the elementary winding of pulse transformer usually, and this Secondary winding of transformer is connected with output.Pulse transformer changes the level that is fit to and enough starts lamp to reach for the pulse that forms provides to boost in secondary winding in start-up circuit.Preferably, secondary winding is between bead and corresponding output.This high-frequency signal that can advantageously avoid starting impulse to cause as much as possible forms the input of switch attitude power supply.It realizes that by a very favorable mode promptly third and fourth conductive branch all has bead.
Normally and be preferably, high-pressure discharge lamp moves under the voltage of polar cycle variation.The circuit that starts and move this lamp and have a switch attitude power supply comprises a commutator at this purpose, and it is connected to third and fourth conductive branch.Commutator has at least two, common or even four switch elements, and they are conducting and not conducting alternately.Here preferably bead between switch element and output.
Normally, switch attitude power supply comprises that the AC voltage that is used for coming from the power supply that connects becomes the rectifying device of dc voltage.Situation when the leakage current by additional common mode capacitance device inflow place is connected to the AC electrode less than additional common mode capacitance element significantly between earth terminal and DC electrode the time with additional common mode capacitance component positioning curiously.This makes can give additional higher appearance value of common mode capacitance element, and the result improves the behavior of common-mode filter.
Above-mentioned and others of the present invention will be below set forth in more detail with reference to the accompanying drawing of in a circuit according to the invention embodiment, wherein
Fig. 1 is the circuit diagram according to the prior art circuit,
Fig. 2 is the circuit diagram of the circuit according to the present invention,
Fig. 3 shown in detail Fig. 2 circuit the part and
Fig. 4 be by Fig. 2 circuit generate in disturbing signal frequency figure.
Fig. 1 has shown the circuit that is used for starting and moving discharge lamp 9.Shown in circuit relate to and be applicable to operation high-pressure discharge lamp, particularly metal halide lamp, ballast, have
-be used for connecting first and second inputs 1,2 and the earth terminal 3 of power supply,
-difference and common mode filtering device 4 wherein are equipped with inductance element 400,403 and capacity cell 41,42,44,
-respectively by first and second conductive branch 5,6 be connected to first and second inputs switch attitude power supply 1 and,
-being used for connecting first and second outputs 7,8 of discharge lamp, output is connected to switch attitude power supply by third and fourth conductive branch 10,11 respectively.
Filter 4 is used for realizing satisfying the ballast of the designing requirement of known EN55015.It guarantees the quantity of the interference signal that takes place by following manner, particularly from 9kHz in the 30kHz frequency range, remain on low maximum allowable level under given conditions.
In known ballast, inductance element comprises first and second coils 401 that intercouple, 402, lay respectively in first and second conductive branch, form a co-mode coil and an inductance that separates 403, be that two coil distribution are in two conductive branch and intercouple, as the difference coil in form.The capacitor filtering device comprises a differential capacitor 41, and it connects first and second conductive branch and between co-mode coil 400 and difference coil 403, and simultaneously and common mode capacitance device 42 formation series circuits that form the partition capacitance filter.The common mode capacitance device is formed up to the contact between small part inductance element and the earth terminal 3.Differential capacitor 41 and additional differential capacitor 44 and inductance 403 form difference filter, and common mode capacitance device 42 and co-mode coil 400 form common-mode filter simultaneously.Common mode capacitance device in the known circuit is formed by a single capacitor.
Circuit shown in Figure 2 is in a circuit according to the invention.Parts corresponding to Fig. 1 have provided identical label.By the first and second coil 40A, 40B and leakage are coupled and are placed in respectively in first and second conductive branch to constitute inductance element.Therefore coupling inductance forms with additional common mode capacitance device 42 and partly is used for the common-mode filter of 9kHz to the 30MHz frequency range, and wherein leakage inductance forms the part difference filter.Input 1,2 and output 7,8 are connected with each other and are connected to earth terminal by capacitor filtering device 41,42 and 45,46 respectively.In addition, bead 47,48 (preferred ferrite pearl) is included in each conductive branch 10,11, and common mode capacitance device 43 is between inductance element 400 and switch attitude power supply I simultaneously.
Shown switch attitude power supply among Fig. 3 in more detail.Switch attitude power supply comprises rectifying device 15, and the AC voltage that is used for coming from the power supply that connects become dc voltage, be thereafter a DC-DC transducer 16 and the 2nd DC-DC transducer 17.Then transducer 17 is connected to commutator 20.Rectifying device 15, DC-DC transducer 16,17, and commutator 20 interconnects by electric conductor 151 and 152.Each DC-DC transducer comprises that controllable switch element is in conducting and not conducting by control by the signal period property ground that control circuit 18 produces.Measuring impedance 19 is included between two DC-DC transducers in the DC electric conductor 152 to form control signal.Realized advantageously that in the connection of measuring common mode capacitance element additional between impedance and the DC-DC transducer 17 measuring impedance only reaches insignificant low-level to the contribution that produces interference signal.The commutator 20 that is connected to third and fourth conductive branch comprises four switch elements 21,22,23,24, and they alternately are in conducting and not conducting.Commutator also comprises with the start-up circuit 25 that generates the starting resistor pulse.This circuit comprises the elementary winding 261 of pulse transformer 26, and Secondary winding of transformer 262 is connected between output 8 and filtering capacitor 45 with output 8.Bead 47 is positioned between switch element 21,22 and the output 7.Bead 48 is positioned between switch element 23,24 and the secondary winding 262.
In the actual enforcement of the embodiment of described circuit, circuit is applicable to and starts and the operation metal halide lamp, the CDM 35W type made of Philips company for example, and power 39W is designed to be connected to 220V, the 50Hz power supply.Filter is made of following elements:
Coil 40A, 40B self-induction 2
*13mH
Leakage inductance 400 μ H
Bead 46,47 BL02RN2, Murata company makes
Capacitor 41 300nF
42 470pF
43 2.2nF
44 10nF
45 4.7nf
46 470pF
The one DC-DC transducer 16 be a upconverter it form the 400V dc voltage from full-wave rectified voltage and offer the 2nd DC-DC transducer 17.Transducer 17 constitutes a ring fire (Buck) or down-converters, when lamp stable operation as the Control current maker.The about 90V of modulating voltage during stable operation.During lamp stable operation, the controllable switch element of two DC-DC transducers is high frequency ground respectively, in the 0.2MHz scope, alternately is in conducting and not conducting at 17kHz.The switch element of commutator switch is basically with alternately conducting and the not conducting of frequency of constant 150Hz.Therefore the secondary winding 262 of pulse transformer 26 has 76 circles and has bigger parasitic capacitance and suppressing aspect the interference signal without any important function.
Fig. 4 A, B are the quantitative frequency diagrams of interference signal that is generated when moving by the described CDM 35W of embodiment lamp (Philips company produces rated power 39W), measure by the way of peak value measurement.Signal density is with conventional unit described point on ordinate, and frequency is on abscissa.Fig. 4 A has shown the frequency range that standard EN 55015 covers.Fig. 4 B relates to the frequency range that standard EN 55022 covers.Suitable and the specific measuring technique that require of each frequency range may increase the difference of the interference signal value of the same frequency that measures according to EN55015 or EN55022 measurement the time.The intensity of the signal that curve 100 expressions measure, curve 200 is the maximum proof strengths according to EN55015 and EN55022.Owing to keep below curve 200, obviously satisfy the two requirement of EN55015 and EN55022 in a circuit according to the invention at whole frequency range inner curve 100.As a comparison, curve 300 has shown the signal strength signal intensity when using known circuit.
Claims (6)
1. a circuit that is used to start and move discharge lamp has
-be used for connecting first and second inputs of power supply, and earth terminal,
-difference and common mode filtering device wherein are equipped with inductance element and capacitor filtering element,
-respectively by first and second conductive branch be connected to first and second inputs switch attitude power supply and,
-being used for connecting first and second outputs of discharge lamp, output is connected to by third and fourth conductive branch respectively
Switch attitude power supply,
It is characterized in that input and output are connected with each other by the capacitor filtering device and are connected to earth terminal, it is characterized in that one in the conductive branch comprises bead, the common mode capacitance element that its feature also is to add is between inductance element and switch attitude power supply.
2. according to the circuit of claim 1, it is characterized in that settling two beads, wherein bead is arranged in the different different conductive branch of polarity each other.
3. according to the circuit of claim 1 or 2, it is characterized in that switch attitude power supply has the commutator that comprises switch element, it alternately is in conducting and not conducting, and wherein bead between switch element and output.
4. according to claim 1,2 or 3 circuit, it is characterized in that circuit has with the start-up circuit that generates the starting resistor pulse, the elementary winding that comprises pulse transformer, Secondary winding of transformer is connected with output, and its feature is that also secondary winding is between bead and corresponding output.
5. according to claim 1,2,3 or 4 circuit, it is characterized in that circuit has with the start-up circuit that generates the starting resistor pulse, the elementary winding that comprises pulse transformer, Secondary winding of transformer is connected with output, and its feature is that also secondary winding is between an output and capacitor filtering device separately.
6. according to claim 1,2,3,4 or 5 circuit is characterized in that switch attitude power supply comprises rectifying device and DC electric conductor, and its feature is that also additional common mode capacitance element is connected between earth terminal and the DC electric conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97190370A CN1189286A (en) | 1996-04-18 | 1997-03-27 | Circuit arrangement |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96201036.9 | 1996-04-18 | ||
| CN97190370A CN1189286A (en) | 1996-04-18 | 1997-03-27 | Circuit arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1189286A true CN1189286A (en) | 1998-07-29 |
Family
ID=5178714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97190370A Pending CN1189286A (en) | 1996-04-18 | 1997-03-27 | Circuit arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1189286A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456468A (en) * | 2012-05-31 | 2013-12-18 | 三星电机株式会社 | Coil component, and electronic device and power over ethernet system having the same |
-
1997
- 1997-03-27 CN CN97190370A patent/CN1189286A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456468A (en) * | 2012-05-31 | 2013-12-18 | 三星电机株式会社 | Coil component, and electronic device and power over ethernet system having the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Applicant after: Koninklike Philips Electronics N. V. Applicant before: Philips Electronics N. V. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: N.V. PHILIPS OPTICAL LAMP LTD., CO. TO: ROYAL PHILIPS ELECTRONICS CO., LTD. |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |