CN100381021C - Method and device for preventing high frequency electron ballast to produce accoustic oscillation - Google Patents
Method and device for preventing high frequency electron ballast to produce accoustic oscillation Download PDFInfo
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- CN100381021C CN100381021C CNB021204764A CN02120476A CN100381021C CN 100381021 C CN100381021 C CN 100381021C CN B021204764 A CNB021204764 A CN B021204764A CN 02120476 A CN02120476 A CN 02120476A CN 100381021 C CN100381021 C CN 100381021C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
The present invention discloses a method and a device for preventing a high-frequency electronic ballast from generating acoustic oscillation. The electronic ballast of the present invention comprises a pulse phase modulator, a switch drive circuit, a feedback circuit, a coupling power matching circuit and a starting circuit, wherein the pulse phase modulator generates a pulse signal with phase modulated. The pulse phase modulator generates a phase modulation pulse signal which controls the DC starting circuit by the switch drive circuit and a coupling circuit in order to make a high-pressure gas discharge lamp ignited. The present invention avoids the acoustic oscillation by using a phase pulse modulation method and avoids the electronic ballast overload when the high-pressure gas discharge lamp is started by using a pulse deduction method. The pulse phase modulator, the switch drive circuit and the feedback circuit form a constant power switch source in order to make a lamp tube work in a steady state. The low starting frequency is in favor of extending the service life of the lamp tube. The whole circuit has the advantages of simple structure, stable operation, high efficiency and low cost.
Description
Technical field
The present invention relates to electric ballast, refer to a kind of method of the high frequency electron ballast to produce accoustic oscillation that prevents use such as high-pressure discharge especially and adopt the impulse phase modulation and high-voltage gas discharging light (HID) electric ballast of direct current startup to realize this method.
Background technology
At present, high-voltage gas discharging light is widely used in outdoor lighting.Though its efficient is high and the life-span is long, but more following properties influence of high-voltage gas discharging light price and reliability with its matching used ballast.
1, after fluorescent tube is lighted, arrive in flat-out this time a few minutes, fluorescent tube maintains very low voltage drop (being about below 1/3rd of normal value).This just requires ballast to have certain overload capacity.
Otherwise 2, high dynamic load characteristic can from very low impedance change to instantaneously the open circuit or.This just requires ballast to have permanent power output, so that open-circuited load and overload protection can be provided.
3, conspicuous on any frequency of hundreds of kilohertz at hundreds of, all may produce sound oscillation, and cause the arc light instability, and bring fluorescent tube to damage.And this frequency can be different different because of lamp, and it is interim to be present in whole lamp tube service life.Therefore it is just very unreliable that great majority are operated in the electric ballast of this frequency range.
Ferromagnetic ballast is operated in 50 hertz or 60 hertz of gauze frequencies, does not possess the sound oscillation condition, again because of using high-power transformer to overcome overload.But weight is big, efficient is low, and the power capacity of a costliness of need is to solve the low excessively problem of power factor.
Present most of high-frequency electronic ballast all is the problem that the frequency of employing variation solves sound oscillation, for example pulse frequency modulated technology.But this method makes frequency range big, and period of change is fast, and it is not thorough that the sound oscillation problem solves, and also cause audible noise and electromagnetic noise, burns out fluorescent tube easily, even burn ballast.The design that has uses the power source of fast feedback circuit to drive fluorescent tube.This method makes design complicated and also increased cost.These reasons have all caused the existing matching used electric ballast consumed energy of high-voltage gas discharging light too much, and cost is big, job insecurity, and reliability is low.
Summary of the invention
The objective of the invention is,, provide a kind of method that prevents high frequency electron ballast to produce accoustic oscillation at the deficiency of electric ballast in the above-mentioned background technology.
Another object of the present invention is to provide a kind of impulse phase modulation and direct current of adopting to start to realize high-voltage gas discharging light (HID) electric ballast of said method.
Method of the present invention comprises step at least:
The impulse phase modulator produces the phase-modulated pulse sequence after the phase modulated, gives switch driving circuit;
Feedback circuit feeds back to described impulse phase modulator with the switched current pulse change width of the power driving circuit of described switch driving circuit, and the switched current pulse changes in amplitude of the power driving circuit of described switch driving circuit is fed back to the switching circuit of described switch driving circuit, so that the phase-modulated pulse sequence after repeating repeatedly on the phase place, jumps on another new phase place.
According to said method, wherein:
The largest interval of described phase hit is less than 10 pulse periods; The cycle of described phase-modulated pulse sequence is greater than 5 milliseconds, to stop the generation of low frequency sound oscillation; Described impulse phase modulation can be two-phase or heterogeneous modulation, and the steady job frequency of this phase-modulated pulse sequence can be a kilo hertz level; When the two-phase modulation was adopted in described impulse phase modulation, this phase-modulated pulse sequence can be 2
N-1 pseudo random sequence is represented two phase places with 0 or 1, and the maximum phase saltus step is N pulse period, wherein N＜10 at interval; Described impulse phase modulation is adopted when modulating more than three-phase or the three-phase, can use fixing phase hit N at interval, promptly in the phase-modulated pulse sequence, exports pulse and repeat N pulse period, wherein N＜10 on each phase place.
Realize the electronic ballast for high-pressure discharge lamp of above-mentioned described method, its design feature is to comprise at least:
One impulse phase modulator: produce the phase-modulated pulse sequence after the pulse phase modulated with fixed frequency;
One switch driving circuit: receive the output pulse of described impulse phase modulator, be used for providing driving power to high-voltage gas discharging light;
One feedback circuit: be used for the current pulse width of power driving circuit of feedback switch drive circuit and changes in amplitude in order to control impuls sequence break-make;
One coupling circuit: be connected between high-voltage gas discharging light and the switch driving circuit, to improve power coupling each other;
One direct current start-up circuit: adjustable lower frequency is arranged in order to light high-voltage gas discharging light.
Effect of the present invention is: adopt the impulse phase modulator approach to avoid the generation sound oscillation, simplified circuit, adopt impulse phase deduction technical protection the fluorescent tube overcurrent and the switch driving circuit that cause because of low tube impedance or short time output short-circuit overheated.The direct current start-up circuit has guaranteed that fluorescent tube is connected with the DC series of power driving circuit, thereby has realized load open circuit protection.Therefore the existing high-frequency electronic ballast circuit engineering of the present invention is more succinct, and power consumption is low, has improved operating efficiency and reliability significantly, and production cost is lower simultaneously.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is a circuit theory schematic diagram of the present invention;
Fig. 3 is another circuit theory schematic diagram of the present invention;
Fig. 4 is the realization circuit diagram corresponding to the embodiment of Fig. 2;
Fig. 5 is the realization circuit diagram corresponding to the embodiment of Fig. 3.
Embodiment
Consult Fig. 1: when power supply was interchange, rectification circuit provided DC power supply for entire circuit.Impulse phase modulator 1 produces the pulse signal after the phase modulated, gives switch driving circuit 2.In the present embodiment, switch driving circuit 2 comprises a switching circuit and a power driving circuit, switching circuit is a translation circuit, it forms the pulse-phase modulation signal source with impulse phase modulator 1, in order to promote power driving circuit and start-up circuit 5 high-voltage gas discharging light 6 is lighted.The switched current pulse width of power driving circuit and changes in amplitude reflect whole electric ballast operating state, feedback circuit 3 feeds back to impulse phase modulator 1 and switching circuit respectively with it, pulse train with control output, promptly, make the phase-modulated pulse sequence after repeating limited number of time on the phase place, jump on another new phase place, to guarantee the electric ballast working stability.Coupling circuit 4 is used for improving the power coupling between switch driving circuit 2 and the high-voltage gas discharging light 6.After starting high-voltage gas discharging light 6, start-up circuit 5 is in standby mode, whole electric ballast steady operation.
Consult Fig. 2: impulse phase modulator 1 and switching circuit 2 are controlled by switched current pulse width feedback circuit and the switched current pulse amplitude feedback circuit in the feedback circuit respectively.Power switch pipe M1, resistance R, diode D20 and inductance L 20 are formed power driving circuit.Capacitor C 20, inductance L 21 and lamp 6 are formed coupling circuit.Start-up circuit is made up of silicon two-terminal element SIDAC, capacitor C 21 and the resistance R 21 of tap place that is connected to inductance L 21 〉=15:1, and small inductor L22 is used for promoting keep-alive voltage, and start-up circuit is that direct current starts.
The fixed frequency of impulse phase modulator 1 output pulse signal can adopt two-phase or multiphase modulation from several kilo hertzs to tens kilo hertzs.The output pulse repeats limited number of time on a phase place, promptly can be several times, tens times or hundreds of time, move on to then on the new phase place.When the maximum phase saltus step of output pulse during, can prevent reliably that fluorescent tube from producing sound oscillation at interval less than 10 pulses.The cycle of phase hit sequence is greater than 5 milliseconds, with the all-bottom sound vibration of avoiding phase hit sequence envelope to cause.When adopting the two-phase modulation, available 2
N-1 binary pseudo-random sequence, the maximum phase saltus step is at interval less than N pulse; When heterogeneous modulation, can adopt the stationary phase saltus step, be spaced apart N pulse.
In the present invention, be to adopt low frequency to start to high-voltage gas discharging light 6, adjusting resistance R 21, can to make the optimum value that triggers frequency be that per second 1 time is to for several times.The low frequency that starts helps prolonging lamp tube service life, has also avoided owing to the fluorescent tube loose contact damages silicon two-terminal switch element.
Consult Fig. 4: this is that example provides with 75 watts of electric ballasts.Use microprocessor as the impulse phase modulator, its model is PIC12C508.Inside programming guarantees that it is output as fixed-frequency, through the pulse sequence signal of phase modulated, can satisfy the needs of electric ballast steady operation.In the present embodiment, the PIC12C508 output pulse frequency can be 17～25 kilo hertzs, as be chosen as 17 kilo hertzs, width can be 1～5 microsecond, as being chosen as 1 microsecond, phase increment is can be greater than zero and less than three phase modulated signals of 2 microseconds, as is chosen as 2 microseconds, the cycle of whole phase hit sequence can be 10～20 milliseconds, as is chosen as 10 milliseconds.Switching circuit is time-base circuit LMC555, can be with the voltage of microprocessor output 5 volts, width be 1 delicate pulse-phase modulation conversion of signals to become voltage be that 13 volts, width are the pulse-phase modulation signal of 18 microseconds, with the power switch pipe M1 in the promotion power driving circuit.Resistance R 42 and triode T40 form switched current pulse amplitude feedback circuit, and the thermistor R201 of negative temperature coefficient is used to compensate the temperature drift of triode T40.Resistance R 60 and R61 form switched current pulse width feedback circuit.In start-up circuit, the ignition frequency of lighting high-voltage gas discharging light is determined by capacitor C 21 and resistance R 21, and is irrelevant with the operating frequency of high-voltage gas discharging light.Triggering frequency in the present embodiment is per second about 5 times, can regulate by resistance R 21.Small inductor L22 is used for promoting keep-alive voltage.After high-voltage gas discharging light is lighted, capacitor C 21, silicon two-terminal switch element and resistance R 21 are in bypass condition, this is that this voltage drop is lower than the puncture voltage of silicon two-terminal switch element because the voltage on the capacitor C 21 is limited by the voltage drop of high-voltage gas discharging light.
Present embodiment mesohigh gaseous discharge lamp operating current contains DC component, causes the photochromic inequality of fluorescent tube for avoiding it, and the operating frequency of switching circuit should be lower than 20 kilo hertzs.
Because fluorescent tube is connected on direct current with power driving circuit, when fluorescent tube was opened a way, the electric current of power driving circuit dropped to zero, has realized the high-voltage gas discharging light open-circuit-protection automatically.
Overload protection of the present invention is to be realized by pulse deduction technology.When fluorescent tube was lighted startup, the lamp impedance was very low, and the temperature rising along with lamp slowly reaches its standard termination impedance.Because constant power source drives, the fluorescent tube Low ESR of lighting in the initiating process will cause the lamp current overcurrent, and power can not all be transferred on the fluorescent tube of low-resistance, makes power driving circuit overheated.Wherein part power will be stored on inductance L 20 and the capacitor C 20.When this means power switch pipe M1 conducting, existing electric current flows through in the inductance, causes the electric current pulsewidth to narrow down.The current pulse width that causes because of overload descends by the detection of switched current pulse width feedback circuit, it is fed back to microprocessor make its deduction next pulse output.Can transfer on the fluorescent tube of high-voltage gas discharging light with free-running form in order to the surplus power that the guaranteed output drive circuit has time enough to make to be stored on inductance and the electric capacity, thereby prevent that also power driving circuit is overheated.Rise in the process of whole impedance at tube impedance, this pulse deduction effect reduces fewer and feweri gradually from every next pulse, until disappearance.Under extreme overload situations, this pulse deduction technology can make the power output of power driving circuit reduce half.The pulse subtraction method has not only been avoided the fluorescent tube overcurrent, has also protected the power driving circuit problems of excessive heat that causes because of lower tube impedance or short time output short-circuit.
Under-voltage protecting circuit comprises voltage-stabiliser tube Z50, triode T50 and resistance R 50, R51.When 13 volts of line under-voltages, this circuit makes microprocessor set, and forces it to quit work, in order to avoid power switch pipe M1 crosses cause thermal damage because of the conducting of unsaturation attitude.
Feedback in the present embodiment also can adopt other performance parameter variations of observation circuit to obtain, as load current variation etc.
Embodiment 2:
Consult Fig. 3 and Fig. 5.Compare with embodiment 1, increased the bleeder resistor R18 of power switch pipe M2, earial drainage diode D16, dividing potential drop capacitor C 17 and C19 and big resistance.Power switch pipe M2 is in the normal off state.Have only when power switch pipe M1 has current impulse, conducting after postponing half pulse period, the duration is identical with power switch pipe M1 current impulse.
Before high-voltage gas discharging light 6 started, power switch pipe M2 was in the normal off state, and bleeder resistor R18 makes that pressure drop equals about voltage 350V on the dividing potential drop capacitor C 19, and its start-up course is identical with embodiment 1.
After high-voltage gas discharging light 6 started, power switch pipe M2 and power switch pipe M1 symmetrical operation made lamp works in exchange status, and described power switch pipe can be MOSFET, IGBT or bipolar power transistor.The influence of the bleeder resistor R18 of big impedance can be ignored.Voltage drop on the dividing potential drop capacitor C 19 is by the ratio decision of dividing potential drop capacitor C 17 and C19.
Present embodiment more helps eliminating the caused photochromic uneven phenomenon of direct current biasing on the fluorescent tube.
Claims (16)
1. method that prevents high frequency electron ballast to produce accoustic oscillation is characterized in that comprising at least step:
The impulse phase modulator produces the phase-modulated pulse sequence after the phase modulated, gives switch driving circuit;
Feedback circuit feeds back to described impulse phase modulator with the switched current pulse change width of the power driving circuit of described switch driving circuit, and the switched current pulse changes in amplitude of the power driving circuit of described switch driving circuit is fed back to the switching circuit of described switch driving circuit, so that the phase-modulated pulse sequence is after repeating repeatedly on the phase place, jump on another new phase place, wherein, the largest interval of phase hit is less than 10 pulse periods.
2. the method for claim 1 is characterized in that: the cycle of phase-modulated pulse sequence is greater than 5 milliseconds, to stop the generation of low frequency sound oscillation.
3. the method for claim 1 is characterized in that: the impulse phase modulation can be two-phase or heterogeneous modulation, and the steady job frequency of described phase-modulated pulse sequence can be a kilo hertz level.
4. the method for claim 1 is characterized in that: when the two-phase modulation was adopted in described impulse phase modulation, this phase-modulated pulse sequence can be 2
N-1 pseudo random sequence is represented two phase places with 0 or 1, and the maximum phase saltus step is N pulse period, wherein N＜10 at interval.
5. method as claimed in claim 3, it is characterized in that: described impulse phase modulation is adopted when modulating more than three-phase or the three-phase, can use fixing phase hit N at interval, promptly in the phase-modulated pulse sequence, the output pulse repeats N pulse period, wherein N＜10 on each phase place.
6. a realization is characterized in that comprising at least according to the electronic ballast for high-pressure discharge lamp of the described method of claim 1:
One impulse phase modulator: produce the phase-modulated pulse sequence after the pulse phase modulated with fixed frequency;
One switch driving circuit: receive the output pulse of described impulse phase modulator, be used for providing driving power to high-voltage gas discharging light;
One feedback circuit: be used for the current pulse width of power driving circuit of feedback switch drive circuit and changes in amplitude in order to control impuls sequence break-make;
One coupling circuit: be connected between high-voltage gas discharging light and the switch driving circuit, to improve power coupling each other;
One direct current start-up circuit: adjustable lower frequency is arranged in order to light high-voltage gas discharging light.
7. electronic ballast for high-pressure discharge lamp as claimed in claim 6 is characterized in that: described impulse phase modulator comprises a microprocessor.
8. electronic ballast for high-pressure discharge lamp as claimed in claim 6 is characterized in that: switch driving circuit comprises a switching circuit and power driving circuit, and described switching circuit is used to promote described power driving circuit.
9. electronic ballast for high-pressure discharge lamp as claimed in claim 8, it is characterized in that: described power driving circuit comprises a power switch pipe, an inductance, diode and a sampling resistor, this power driving circuit is controlled by impulse phase modulator and switching circuit, provides power through coupling circuit to fluorescent tube.
10. electronic ballast for high-pressure discharge lamp as claimed in claim 8, it is characterized in that: described power driving circuit can comprise two power switch pipes, after fluorescent tube was lighted, two power switch pipe symmetrical operations were in order to offset the direct current biasing phenomenon on the fluorescent tube.
11. as claim 9 or 10 described electronic ballast for high-pressure discharge lamp, it is characterized in that: described power switch pipe can be MOSFET, IGBT or bipolar power transistor.
12. electronic ballast for high-pressure discharge lamp as claimed in claim 6, it is characterized in that: described feedback circuit comprises a switched current pulse width feedback circuit, and the current pulse width state of this feedback circuit detection power drive circuit also feeds back to the impulse phase modulator.
13. as claim 6 or 12 described electronic ballast for high-pressure discharge lamp, it is characterized in that: described feedback circuit comprises a switched current pulse amplitude feedback circuit, and this feedback circuit feeds back to the current impulse amplitude state of power driving circuit the switching circuit of switch driving circuit.
14. electronic ballast for high-pressure discharge lamp as claimed in claim 6 is characterized in that: described coupling circuit comprises an inductance, the fluorescent tube branch road in electric capacity and formation LRC in parallel loop; Under the switch driving circuit effect, be used for promoting the equivalent load impedance of fluorescent tube, to improve power coupling efficiency.
15. electronic ballast for high-pressure discharge lamp as claimed in claim 6, it is characterized in that: described direct current start-up circuit comprises an electric capacity, a silicon two-terminal switch element, an inductance and a resistance, wherein silicon two-terminal switch element be connected to inductance more than or equal in 15: 1 the tap, regulate the ignition frequency of this start-up circuit of resistance may command.
16. electronic ballast for high-pressure discharge lamp as claimed in claim 9; it is characterized in that: this electric ballast also comprises under-voltage protecting circuit; this under-voltage protecting circuit is made of voltage stabilizing didoe, a PNP transistor and two resistance; be used for when power switch pipe is overheated under unsaturated state, to impulse phase modulator output control asserts signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021204764A CN100381021C (en) | 2002-05-24 | 2002-05-24 | Method and device for preventing high frequency electron ballast to produce accoustic oscillation |
| HK04103722A HK1060814A1 (en) | 2002-05-24 | 2004-05-25 | Method and device of preventing the generation of sound vibration in high-requency electronic ballast resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021204764A CN100381021C (en) | 2002-05-24 | 2002-05-24 | Method and device for preventing high frequency electron ballast to produce accoustic oscillation |
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| Publication Number | Publication Date |
|---|---|
| CN1459999A CN1459999A (en) | 2003-12-03 |
| CN100381021C true CN100381021C (en) | 2008-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021204764A Expired - Fee Related CN100381021C (en) | 2002-05-24 | 2002-05-24 | Method and device for preventing high frequency electron ballast to produce accoustic oscillation |
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| CN (1) | CN100381021C (en) |
| HK (1) | HK1060814A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037603B (en) * | 2013-01-10 | 2015-09-30 | 湖南星联顶晟电子科技有限公司 | There is HID lamp electric ballast and the predrive method thereof of multi-protective function |
| CN103313495B (en) * | 2013-06-12 | 2015-08-05 | 肖国选 | Single tube resonant mode light-adjustable gas discharge lamp electronic ballast |
| JP6814085B2 (en) * | 2017-03-31 | 2021-01-13 | エイブリック株式会社 | Monitoring circuit and semiconductor device |
| CN108896820B (en) * | 2018-07-19 | 2020-09-22 | 国电南京自动化股份有限公司 | Phase modulator startup protection phasor calculation method suitable for starting static frequency converter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2438294Y (en) * | 2000-06-15 | 2001-07-04 | 珠海市明宏集团有限公司 | AC electronic ballast for high-intensity gas discharge lamp |
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2002
- 2002-05-24 CN CNB021204764A patent/CN100381021C/en not_active Expired - Fee Related
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- 2004-05-25 HK HK04103722A patent/HK1060814A1/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2438294Y (en) * | 2000-06-15 | 2001-07-04 | 珠海市明宏集团有限公司 | AC electronic ballast for high-intensity gas discharge lamp |
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| Publication number | Publication date |
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| CN1459999A (en) | 2003-12-03 |
| HK1060814A1 (en) | 2004-08-20 |
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