CN201805608U - Electronic ballast - Google Patents
Electronic ballast Download PDFInfo
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- CN201805608U CN201805608U CN2010202491151U CN201020249115U CN201805608U CN 201805608 U CN201805608 U CN 201805608U CN 2010202491151 U CN2010202491151 U CN 2010202491151U CN 201020249115 U CN201020249115 U CN 201020249115U CN 201805608 U CN201805608 U CN 201805608U
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Abstract
The utility model provides an electronic ballast, which comprises a voltage change circuit, an inverting circuit, a stability judging circuit and a controllable igniting circuit, wherein, the output end of the voltage change circuit provides DC input voltage that is adjusted; the input end of the inverting circuit is electrically coupled with the output end of the voltage change circuit, and the output end of the inverting circuit provides AC voltage to drive a gas discharge lamp; the output end of the stability judging circuit provides signals to indicate whether the DC input voltage is stable or not; in addition, the input end of the controllable igniting circuit is electrically coupled with the output end of the stability judging circuit, and the output end of the controllable igniting circuit is coupled with the gas discharge lamp to ignite the gas discharge lamp, wherein, the controllable igniting circuit does not start up until the DC input voltage is stable. The electronic ballast can provide stable igniting voltage so as to reliably ignite the gas discharge lamp in time, and can also protect the gas discharge lamp and the electronic ballast from being damaged.
Description
Technical field
The utility model relates to a kind of electric ballast.
Background technology
Gaseous discharge lamp as fluorescent lamp, high-pressure sodium lamp, metal halide lamp etc., needs electric ballast that AC drive voltage is provided so that its operate as normal usually.Usually, electric ballast as power supply, is a direct current input voltage with ac grid voltage or the dc-battery voltage transitions that receives with electrical network or battery, by inverter circuit this DC input voitage is converted to required AC drive voltage again.
The driving voltage difference that gaseous discharge lamp needs at different working stages, it needs higher driving voltage (characteristic and the different of application scenario according to lamp are not waited to several ten thousand volts by several hectovolts), the operating voltage under stable state then lower (for example less than 200 volts) at ignition phase.Ignition method commonly used has two kinds, and a kind of is the resonant mode ignition method, obtains ignition voltage by resonant circuit and frequency sweep; Another kind is the pulsed ignition method, produces a high-voltage pulse to light lamp by a switch and coupling inductor.Generally, as if the loss of ignition first time, electric ballast may quit work, and also (for example several seconds) attempt igniting once more over time.
Fig. 1 is the block diagram of the electric ballast of existing employing pulse firing method, comprises voltage conversion circuit 101, inverter circuit 102, pulse-generating circuit 103, inductor L, coupling inductor L
CoupleWith ignition switch S
Strike Voltage conversion circuit 101 receives the input voltage V that comes from electrical network or battery
In, and be converted into DC input voitage V
Dc Voltage conversion circuit 101 can comprise one or several in rectifier bridge, DC circuit, the ac/dc translation circuit.Inverter circuit 102 is electrically coupled to voltage conversion circuit 101, receives DC input voitage V
DcAnd pass through inductor L at lamp two ends generation AC drive voltage V
OutInverter circuit 102 can adopt any AC/DC transformation topology structure, for example full-bridge, half-bridge etc.Coupling inductor L
CoupleMagnetic coupling is to inductor L, and a termination is received DC input voitage V
DcIgnition switch S
StrikeBe connected electrically in coupling inductor L
CoupleAnd between the ground.Pulse-generating circuit is electrically coupled to ignition switch S
StrikeControl end, when electric ballast starts, produce firing pulse, with ignition switch S
StrikeConducting is closed after a period of time, thereby induces a high voltage at inductor L two ends, and this high voltage is applied to the lamp two ends, thereby lights lamp.
Fig. 2 is the block diagram of the electric ballast of existing employing resonant ignition method, comprises voltage conversion circuit 201, inverter circuit 202, frequency sweep circuit 204, series capacitor C
s, inductor L and shunt capacitor C
p, wherein the effect of voltage conversion circuit 201 and inverter circuit 202 as previously mentioned.Series capacitor C
sBe connected to inductor L, shunt capacitor C
pBe connected in parallel on the lamp two ends.Series capacitor C
s, inductor L and shunt capacitor C
pConstitute resonant circuit.Inverter circuit 202 comprises at least one switch.Frequency sweep circuit 204 is electrically coupled to inverter circuit 202, when electric ballast starts the switching frequency of switch in the inverter circuit 202 is swept downwards from a high value (greater than the resonance frequency of resonant circuit), thereby is produced high voltage so that it is lighted at the lamp two ends.
In above-mentioned two kinds of ignition methods, all direct and DC input voitage V of the size of ignition voltage
DcRelevant, DC input voitage V
DcBig more, ignition voltage is big more.When electric ballast just starts, DC input voitage V
DcStable as yet, may much larger than or less than preset value, thereby cause ignition voltage too high or too low.The too high meeting of ignition voltage causes damage to lamp and electric ballast, crosses to hang down and then can't in time lamp be lighted.
The utility model content
The technical problems to be solved in the utility model provides a kind of electric ballast, and stable ignition voltage can be provided, in time to light discharge lamp reliably and to protect discharge lamp and self avoid damage.
In order to solve the problems of the technologies described above, the utility model provides a kind of electric ballast, comprising: voltage conversion circuit, and its output provides the DC input voitage that is conditioned; Inverter circuit, its input is electrically coupled to the output of described voltage conversion circuit, and its output provides alternating voltage with gas discharge lamp; Whether stabilize decision circuit, its output provide signal to indicate described DC input voitage stable; And the controlled ignition circuit, its input is electrically coupled to the output of described stabilize decision circuit, and its output is coupled to described gaseous discharge lamp so that it is lighted a fire; Wherein said controlled ignition circuit is until the stable just startup of described DC input voitage.
According to embodiment of the present utility model, the input of described stabilize decision circuit is electrically coupled to the input of described inverter circuit, judges by the magnitude of voltage of described DC input voitage whether described DC input voitage is stable.
According to embodiment of the present utility model, described stabilize decision circuit comprises: voltage sampling circuit, and its input is electrically coupled to the input of described inverter circuit, and its output provides the voltage sampling signal of the described DC input voitage of representative; And voltage comparator circuit, possess first input end, second input, the 3rd input and output, described voltage sampling signal and first threshold and second threshold value are compared, wherein first input end is electrically coupled to the output of described voltage sampling circuit, second input receives first threshold, the 3rd input receives second threshold value, and output is the output of described stabilize decision circuit, and wherein said first threshold is less than described second threshold value; Wherein if described voltage sampling signal greater than described first threshold and less than described second threshold value, then starts described controlled ignition circuit.
According to embodiment of the present utility model, described voltage sampling circuit is a resistor voltage divider circuit.
According to embodiment of the present utility model, described voltage comparator circuit comprises: first comparator, and its in-phase input end is electrically connected to the output of described voltage sampling circuit, and its inverting input receives described first threshold; Second comparator, its inverting input is electrically connected to the output of described voltage sampling circuit, and its in-phase input end receives described second threshold value; And with door, two input is electrically connected to the output of described first comparator and second comparator respectively, its output is the output of described voltage comparator circuit; Wherein if a described and door output high level then starts described controlled ignition circuit.
According to embodiment of the present utility model, described stabilize decision circuit comprises timing circuit, starts from described electric ballast to pick up counting, if described timing time surpasses a time threshold value, judges that then described DC input voitage is stable.
According to embodiment of the present utility model, described timing circuit is a digital circuit.
According to embodiment of the present utility model, described timing circuit adopts capacitator charging circuit.
According to embodiment of the present utility model, described controlled ignition circuit comprises: inductor, possess first end and second end, and wherein first end is electrically coupled to the output of described inverter circuit, and second end is electrically coupled to described gaseous discharge lamp; Coupling inductor with described inductor magnetic coupling, possesses first end and second end, and wherein first end is electrically coupled to the input of described inverter circuit; Ignition switch possesses first end, second end and the 3rd end, and wherein first end is electrically coupled to second end of described coupling inductor, the second end ground connection; And pulse-generating circuit, its input is electrically coupled to the output of described stabilize decision circuit, and output is electrically coupled to the 3rd end of described ignition switch; Wherein said pulse-generating circuit is until the stable firing pulse that just produces of described DC input voitage.
According to embodiment of the present utility model, described inverter circuit comprises at least one switch, wherein each switch all possesses first end, second end and the 3rd end, and described controlled ignition circuit comprises: resonant circuit, and electric coupling is between described inverter circuit and gaseous discharge lamp; And frequency sweep circuit, be electrically coupled to the 3rd end of described at least one switch, until the stable switching frequency that just begins to change described at least one switch of described DC input voitage.
The utility model adopts the circuit of said structure; by judging whether DC input voitage is stable; and when stablizing, DC input voitage just begins to light a fire; the influence of having avoided unsettled DC input voitage that ignition voltage is caused; make the discharge lamp in time to be lighted reliably, and protected the safety of self and discharge lamp effectively.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is further described:
Fig. 1 is the block diagram of the electric ballast of existing employing pulse firing method;
Fig. 2 is the block diagram of the electric ballast of existing employing resonant ignition method;
Fig. 3 is the circuit diagram of first execution mode of the utility model electric ballast;
Fig. 4 is the circuit diagram of second execution mode of the utility model electric ballast;
Fig. 5 is the circuit diagram of the 3rd execution mode of the utility model electric ballast;
Fig. 6 is the circuit diagram of the 4th execution mode of the utility model electric ballast.
Embodiment
To describe specific embodiment of the utility model in detail below, should be noted that the embodiments described herein only is used to illustrate, be not limited to the utility model.
The utility model provides a kind of electric ballast, comprises voltage conversion circuit, inverter circuit, stabilize decision circuit and controlled ignition circuit.Voltage conversion circuit provides the DC input voitage V that is conditioned
DcInverter circuit is with DC input voitage V
DcBe converted to alternating voltage with gas discharge lamp.Stabilize decision circuit judges DC input voitage V
DcWhether stable.The controlled ignition circuit is electrically coupled to the stabilize decision circuit, and gaseous discharge lamp is lighted a fire.Wherein the controlled ignition circuit is controlled by the stabilize decision circuit, until DC input voitage V
DcStable just startup.
Fig. 3 is the circuit diagram of first execution mode of the utility model electric ballast, and wherein inverter circuit adopts full-bridge topologies, and the stabilize decision circuit is by DC input voitage V
DcMagnitude of voltage judge that it is whether stable, if DC input voitage V
DcMagnitude of voltage be in preset range, promptly be in normal range of operation, then judge DC input voitage V
DcStable, the controlled ignition circuit then adopts the pulse firing mode.
The stabilize decision circuit comprises voltage sampling circuit 305 and voltage comparator circuit 306.Voltage sampling circuit 305 is electrically coupled to the input of inverter circuit, sampling DC input voitage V
Dc, and DC input voitage V is represented in generation
DcVoltage sampling signal V
SenseIn the present embodiment, voltage sampling circuit 305 is a resistor voltage divider circuit, comprises resistance R
S1And R
S2 Voltage comparator circuit 306 is electrically coupled to voltage sampling circuit 305, with voltage sampling signal V
SenseWith threshold value V
Th1With threshold value V
Th2Compare, wherein threshold value V
Th1Less than threshold value V
Th2If voltage sampling signal V
SenseGreater than threshold value V
Th1And less than threshold value V
Th2, then judge DC input voitage V
DcStable, and start the controlled ignition circuit.In the present embodiment, voltage comparator circuit comprise comparator C OM1, COM2 and with door AND.The in-phase input end of comparator C OM1 is electrically connected to voltage sampling circuit 305 to receive voltage sampling signal V
Sense, inverting input receive threshold V
Th1The inverting input of comparator C OM2 is electrically connected to voltage sampling circuit 305 to receive voltage sampling signal V
Sense, in-phase input end receive threshold V
Th2Be electrically connected to the output of comparator C OM1 and comparator C OM2 respectively with two inputs of door AND, be electrically coupled to the controlled ignition circuit with the output of door AND.If, then start the controlled ignition circuit with door AND output high level.Threshold value V wherein
Th1With threshold value V
Th2Value depend on the ratio of voltage sample and the rated point ignition voltage of lamp.
The controlled ignition circuit comprises pulse-generating circuit 303, inductor L, coupling inductor L
CoupleWith ignition switch S
StrikeInductor L is coupled in series between inverter circuit and the gaseous discharge lamp.Coupling inductor L
CoupleMagnetic coupling is to inductor L, and a termination is received DC input voitage V
DcIgnition switch S
StrikeBe connected electrically in coupling inductor L
CoupleThe other end and ground between.Pulse-generating circuit 303 is electrically coupled to stabilize decision circuit and ignition switch S
StrikeControl end, the control ignition switch S
StrikeConducting and shutoff.Pulse-generating circuit 303 is until DC input voitage V
DcThe stable firing pulse that just produces is to light lamp.
Fig. 4 is the circuit diagram of second execution mode of the utility model electric ballast, wherein inverter circuit and controlled ignition circuit and shown in Figure 3 basic identical, and promptly inverter circuit adopts full-bridge topologies, and the controlled ignition circuit adopts the pulse firing mode; And the stabilize decision circuit comprises timing circuit 407, starts from electric ballast to pick up counting, and judges DC input voitage V by timing time
DcWhether stable.
Fig. 5 is the circuit diagram of the 3rd execution mode of the utility model electric ballast, stabilize decision circuit and shown in Figure 3 basic identical wherein, that is and, the stabilize decision circuit is by DC input voitage V
DcMagnitude of voltage judge that it is whether stable, if DC input voitage V
DcMagnitude of voltage be in preset range, promptly be in normal range of operation, then judge DC input voitage V
DcStable; And inverter circuit adopts half-bridge topology, and the controlled ignition circuit adopts the resonant ignition mode.
The controlled ignition circuit comprises by series capacitor C
s, inductor L and shunt capacitor C
pThe resonant circuit and the frequency sweep circuit 504 that constitute.This resonant circuit electric coupling is between inverter circuit output and gaseous discharge lamp.Frequency sweep circuit 504 is electrically coupled to described inverter circuit, until DC input voitage V
DcThe stable switching frequency that just begins to change inverter circuit is swept it downwards from a high value (common resonance frequency greater than resonant circuit), thereby is produced high voltage so that it is lighted at the gaseous discharge lamp two ends.
Fig. 6 is the circuit diagram of the 4th execution mode of the utility model electric ballast, wherein inverter circuit and controlled ignition circuit and shown in Figure 5 basic identical, that is and, inverter circuit adopts half-bridge topology, and the controlled ignition circuit adopts the resonant ignition mode; Then with shown in Figure 4 basic identical, promptly the stabilize decision circuit comprises timing circuit 607 to the stabilize decision circuit, starts from electric ballast to pick up counting, and judges DC input voitage V by timing time
DcWhether stable
Though described the utility model with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from utility model because the utility model can specifically be implemented in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (10)
1. electric ballast comprises:
Voltage conversion circuit, its output provides the DC input voitage that is conditioned;
Inverter circuit, its input is electrically coupled to the output of described voltage conversion circuit, and its output provides alternating voltage with gas discharge lamp;
Whether stabilize decision circuit, its output provide signal to indicate described DC input voitage stable; And
The controlled ignition circuit, its input is electrically coupled to the output of described stabilize decision circuit, and its output is coupled to described gaseous discharge lamp so that it is lighted a fire;
Wherein said controlled ignition circuit is until the stable just startup of described DC input voitage.
2. electric ballast as claimed in claim 1 is characterized in that, the input of described stabilize decision circuit is electrically coupled to the input of described inverter circuit, judges by the magnitude of voltage of described DC input voitage whether described DC input voitage is stable.
3. electric ballast as claimed in claim 2 is characterized in that, described stabilize decision circuit comprises:
Voltage sampling circuit, its input is electrically coupled to the input of described inverter circuit, and its output provides the voltage sampling signal of the described DC input voitage of representative; And
Voltage comparator circuit, possess first input end, second input, the 3rd input and output, wherein first input end is electrically coupled to the output of described voltage sampling circuit, second input receives first threshold, the 3rd input receives second threshold value, output is the output of described stabilize decision circuit, and wherein said first threshold is less than described second threshold value;
Wherein if described voltage sampling signal greater than described first threshold and less than described second threshold value, then starts described controlled ignition circuit.
4. electric ballast as claimed in claim 3 is characterized in that, described voltage sampling circuit is a resistor voltage divider circuit.
5. electric ballast as claimed in claim 3 is characterized in that, described voltage comparator circuit comprises:
First comparator, its in-phase input end is electrically connected to the output of described voltage sampling circuit, and its inverting input receives described first threshold;
Second comparator, its inverting input is electrically connected to the output of described voltage sampling circuit, and its in-phase input end receives described second threshold value; And
With door, two input is electrically connected to the output of described first comparator and second comparator respectively, and its output is the output of described voltage comparator circuit;
Wherein if a described and door output high level then starts described controlled ignition circuit.
6. electric ballast as claimed in claim 1 is characterized in that, described stabilize decision circuit comprises timing circuit, starts from described electric ballast to pick up counting, if described timing time surpasses a time threshold value, judges that then described DC input voitage is stable.
7. electric ballast as claimed in claim 6 is characterized in that, described timing circuit is a digital circuit.
8. electric ballast as claimed in claim 6 is characterized in that, described timing circuit adopts capacitator charging circuit.
9. as each described electric ballast in the claim 1 to 8, it is characterized in that, described controlled
Firing circuit comprises:
Inductor possesses first end and second end, and wherein first end is electrically coupled to the output of described inverter circuit, and second end is electrically coupled to described gaseous discharge lamp;
Coupling inductor with described inductor magnetic coupling, possesses first end and second end, and wherein first end is electrically coupled to the input of described inverter circuit;
Ignition switch possesses first end, second end and the 3rd end, and wherein first end is electrically coupled to second end of described coupling inductor, the second end ground connection; And
Pulse-generating circuit, its input is electrically coupled to the output of described stabilize decision circuit, and output is electrically coupled to the 3rd end of described ignition switch;
Wherein said pulse-generating circuit is until the stable firing pulse that just produces of described DC input voitage.
10. as each described electric ballast in the claim 1 to 8, it is characterized in that described inverter circuit comprises at least one switch, wherein each switch all possesses first end, second end and the 3rd end, and described controlled ignition circuit comprises:
Resonant circuit, electric coupling is between described inverter circuit and gaseous discharge lamp; And
Frequency sweep circuit is electrically coupled to the 3rd end of described at least one switch, until the stable switching frequency that just begins to change described at least one switch of described DC input voitage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202491151U CN201805608U (en) | 2010-06-30 | 2010-06-30 | Electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202491151U CN201805608U (en) | 2010-06-30 | 2010-06-30 | Electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201805608U true CN201805608U (en) | 2011-04-20 |
Family
ID=43875105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202491151U Expired - Fee Related CN201805608U (en) | 2010-06-30 | 2010-06-30 | Electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201805608U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848587A (en) * | 2010-06-30 | 2010-09-29 | 杭州大邦科技有限公司 | Electronic ballast as well as ignition control device and ignition method thereof |
| CN103944168A (en) * | 2014-04-17 | 2014-07-23 | 中国科学院电工研究所 | High-power power quality comprehensive compensation device |
-
2010
- 2010-06-30 CN CN2010202491151U patent/CN201805608U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848587A (en) * | 2010-06-30 | 2010-09-29 | 杭州大邦科技有限公司 | Electronic ballast as well as ignition control device and ignition method thereof |
| CN101848587B (en) * | 2010-06-30 | 2015-02-25 | 浙江大邦科技有限公司 | Electronic ballast as well as ignition control device and ignition method thereof |
| CN103944168A (en) * | 2014-04-17 | 2014-07-23 | 中国科学院电工研究所 | High-power power quality comprehensive compensation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG DABONG TECHNOLOGY CO., LTD. Free format text: FORMER NAME: HANGZHOU DABONG TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Hangzhou City, Zhejiang province 311100 Yuhang District Canal Town Road No. 3 Building 2 pole Patentee after: Zhejiang Dabang Technology Co.,Ltd. Address before: 311100, No. 37 East Street, East Lake street, Yuhang District, Zhejiang, Hangzhou Patentee before: Hangzhou Dabang Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20170630 |