CN101472365A - Flash control circuit - Google Patents
Flash control circuit Download PDFInfo
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- CN101472365A CN101472365A CNA200710203438XA CN200710203438A CN101472365A CN 101472365 A CN101472365 A CN 101472365A CN A200710203438X A CNA200710203438X A CN A200710203438XA CN 200710203438 A CN200710203438 A CN 200710203438A CN 101472365 A CN101472365 A CN 101472365A
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- charging
- fluorescent tube
- voltage
- capacitor
- triggering
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
A circuit for controlling a flash lamp is used for controlling lamp luminescence. The lamp is provided with trigger electrodes, the circuit for controlling the flash lamp comprises a charging circuit and a trigger circuit, wherein, the charging circuit comprises an energy-storage capacitor and a charging capacitor, and the charging circuit charges the energy-storage capacitor through receiving a first charging voltage and receives a second charging voltage to charge the charging capacitor. If the triggering circuit receives a triggering signal outside, the energy-storage capacitor and the charging capacitor form voltage at two ends of the lamp respectively. The triggering voltage generated by the triggering circuit at the triggering electrodes of the lamp and the voltage formed at two ends of the lamp simultaneously trigger the lamp for conducting to ensure lamp luminescence. The circuit for controlling the flash lamp receives the second charging voltage by adopting the charging circuit so as to improve the voltage at two ends of the lamp so that the flash lamp can stably emit light.
Description
Technical field
The present invention relates to a kind of control technology, relate in particular to a kind of flash control circuit that is applied to digital still camera.
Background technology
In digital still camera, the flash unit flash of light utilizes the storage capacitor charging of charging circuit to photoflash lamp usually, utilize circuits for triggering to apply the triggering high pressure that makes flash lamp tube luminous then, and discharge so that flash lamp tube is luminous by storage capacitor at the trigger electrode of the fluorescent tube (flash tube) of photoflash lamp.Along with digital still camera develops to miniaturization, the flash lamp tube size also requires more and more littler.For guaranteeing the luminous intensity of photoflash lamp, fluorescent tube inside needs higher xenon pressure (density) usually, and the required trigger voltage of lamp luminescence improves thereupon, and conventional circuit can't the trigger flashing lamp luminescence.
Yet the restriction that is subjected to volume owing to the design of the triggering transformer of circuits for triggering is designed to elongated shape, causes the air magnetic circuit elongated, the efficient step-down, and the secondary coil output voltage can't effectively promote, and can't make fluorescent tube normally luminous.Triggering high pressure simultaneously is alternating voltage, promotes the triggering high pressure and can cause high pressure jumping electricity, influences the stability of flash unit.
Summary of the invention
In view of this, be necessary to provide the flash control circuit of the normal luminous and stable performance of a kind of flash lamp tube that can make photoflash lamp.
A kind of flash control circuit is used to control a lamp luminescence.Fluorescent tube has a trigger electrode.Described flash control circuit comprises a charging circuit and circuits for triggering.Described charging circuit comprises a storage capacitor and a charging capacitor.Described charging circuit charges to described storage capacitor by receiving one first charging voltage, and receives one second charging voltage described charging capacitor is charged.If described circuits for triggering receive a triggering signal from the outside, then described storage capacitor and described charging capacitor form voltage at the two ends of described fluorescent tube respectively.The trigger voltage that described circuits for triggering produce at the trigger electrode of described fluorescent tube triggers described fluorescent tube conducting so that described lamp luminescence simultaneously with the voltage of the two ends formation of described fluorescent tube.
Compared to prior art, the charging circuit of described flash control circuit receives first charging voltage respectively and second charging voltage is charged to storage capacitor and charging capacitor.After circuits for triggering received triggering signal, described circuits for triggering produce voltage that trigger voltage and described charging circuit produce at the two ends of fluorescent tube at the trigger electrode of described fluorescent tube made the anode of fluorescent tube and negative electrode conducting so that it is luminous.Described flash control circuit utilizes charging circuit to receive the voltage that second charging voltage has improved lamp tube ends, makes photoflash lamp energy stabilized illumination.
Description of drawings
Fig. 1 is the circuit diagram of the flash control circuit of first execution mode of the present invention.
Fig. 2 is the circuit diagram of the flash control circuit of second execution mode of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is described in further detail.
See also Fig. 1, it is the flash control circuit 100 of first embodiment of the invention, and it is luminous that it is used to control a photoflash lamp 10.Flash control circuit 100 comprises a charging circuit 20 and circuits for triggering 40.Described charging circuit 20 is used for photoflash lamp 10 chargings.Described circuits for triggering 40 are used for providing trigger voltage to photoflash lamp 10.
Described photoflash lamp 10 comprises a fluorescent tube 12 and a storage capacitor C1.Fluorescent tube 12 has an anode 124, a negative electrode 126 and a trigger electrode 128.Trigger electrode 128 is applied to the surface of fluorescent tube 12.Be filled with xenon in the fluorescent tube 12, xenon ionization under high pressure forms Low ESR so that the anode 124 and negative electrode 126 conductings of fluorescent tube 12.The end of storage capacitor C1 links to each other with the anode 124 of fluorescent tube 12, the other end ground connection of storage capacitor C1.
Circuits for triggering 40 comprise a transistor Q1, igbt Q2, diode D3, one trigger capacitor C 3, transformer T and resistance R 4, R5.Transformer T comprises a primary coil L1 and a secondary coil L2.In the present embodiment, the transformation ratio of setting primary coil L1 and secondary coil L2 is 1:20.The base stage of described transistor Q1 links to each other with the grid of described igbt Q2 and is connected to a triggering signal end S3 jointly through resistance R 4 and is used for from triggering signal of outside reception.After the user pressed the button of taking pictures, the signal that the digital processing unit in the digital still camera sends when needing flash of light by judging was the triggering signal of circuits for triggering 40.The base stage of transistor Q1 links to each other with the emitter of transistor Q1 and the grounded emitter of transistor Q1 through resistance R 5.The collector electrode of transistor Q1 is connected between the second current-limiting resistance R2 and charging capacitor C2 of charging circuit 20.The collector electrode of igbt Q2 links to each other with the negative pole of diode D3.The first current-limiting resistance R1 simultaneously is connected in series between the negative pole of the collector electrode of igbt Q2 and the first rectifier diode D1.Trigger between the end of primary coil L1 that capacitor C 3 is connected in series in the collector electrode of igbt Q2 and transformer T.The other end ground connection of primary coil L1.The end of secondary coil L2 links to each other with the trigger electrode 128 of fluorescent tube 12, the other end ground connection of secondary coil L2.The positive pole of diode D3 links to each other with the negative electrode 126 of fluorescent tube 12.
In the present embodiment, the first rectifier diode D1 in the charging circuit 20 receives first charging voltage by the first charging end S1 and is direct current to the storage capacitor C1 charging of photoflash lamp 10 to form voltage U 1 at its two ends with AC rectification.The first rectifier diode D1, the first current-limiting resistance R1 and triggering capacitor C 3 formed charge circuits are to triggering capacitor C 3 chargings to form voltage U 2 at its two ends simultaneously.
The second rectifier diode D2 receives second charging voltage by the second charging end S2 and is direct current with AC rectification.The second rectifier diode D2, the second current-limiting resistance R2, charging capacitor C2 and the formed charge circuit of the 3rd current-limiting resistance R3 charge to form voltage U 3 at its two ends to charging capacitor C2.In the present embodiment, design is to provide the high pressure of 1-2 kilovolt separately for second charging voltage, and promptly the magnitude of voltage of U3 can reach the 1-2 kilovolt.
After transistor Q1 received the triggering signal conducting of trigger end S3, the end of charging capacitor C2 formed the moment negative voltage through the grounded collector of transistor Q1 at the negative electrode 126 of fluorescent tube 12, promptly-and U3.The end ground connection of storage capacitor C1, the other end of storage capacitor C1 forms positive voltage, i.e. U1 at the anode 124 of fluorescent tube 12.Then the voltage U 12=U1-of moment stack between the anode 124 of fluorescent tube 12 and the negative electrode 126 (U3)=U1+U3.Transformer T forms oscillation circuits with triggering capacitor C 3, and the voltage that triggers capacitor C 3 is U2, and the transformation ratio of primary coil L1 and secondary coil L2 is 1:20, then secondary coil L2 generation instantaneous trigger high pressure 20U2.Under the anode 124 that this moment, fluorescent tube 12 produced instantaneous trigger high pressure 20U2 and fluorescent tube 12 at secondary coil L2 and the acting in conjunction of the moment superimposed voltage U12 between the negative electrode 126, the xenon ionization formation Low ESRs in the fluorescent tube 12 are so that the anode 124 and negative electrode 126 conductings of fluorescent tube 12.After this storage capacitor C1 continues fluorescent tube 12 discharges so that fluorescent tube 12 is luminous.
See also Fig. 2, it is the flash control circuit 200 of second execution mode, and it is used for having the electronic installation of preflashing function, and promptly trigger end S3 can receive the preflashing triggering signal and the main triggering signal of dodging is carried out preflashing and once main the sudden strain of a muscle with the trigger flashing lamp.The flash control circuit 100 of the flash control circuit 200 and first execution mode is basic identical, difference is to connect an auxiliary charging capacitor C 4 between the emitter of the negative pole of the second rectifier diode D2 and transistor Q1, other structures are identical with first execution mode, do not repeat them here.
In the present embodiment, the capacitance of auxiliary charging capacitor C 4 is charging capacitor C2 charging greater than the capacitance of charging capacitor C2 so that the charging voltage of auxiliary charging capacitor C 4 is convenient to auxiliary charging capacitor C 4 greater than the charging voltage of charging capacitor C2.Receive second charging voltage and be direct current to 4 chargings of auxiliary charging capacitor C so that its two ends form voltage U 4 at the second charging voltage end S2 AC rectification.
After trigger end S3 receives the preflashing triggering signal and makes fluorescent tube 12 luminous end, the charging capacitor C2 end of discharging.Because the preflashing triggering signal is very short with the main sudden strain of a muscle trigger signal interval time, the second charging voltage end S2 can't charge to charging capacitor C2 once more.Utilize this moment auxiliary charging capacitor C 4 and the second current-limiting resistance R2, charging capacitor C2, the formed loop of the 3rd current-limiting resistance R3 to charging capacitor C2 charging, the two ends of charging capacitor C2 have voltage U 5 again, and U5 ≈ U4.Storage capacitor C1 still has a voltage U 6 after preflashing, and voltage U 6 is less than U1, i.e. U6＜U1.Trigger capacitor C 3 and still have a voltage U 7 this moment, and U7 ≈ U6.
When trigger end S3 received master's sudden strain of a muscle triggering signal, the end of charging capacitor C2 formed the moment negative voltages through the grounded collector of transistor Q1 at the negative electrode 126 of fluorescent tube 12, promptly-and U5.The end ground connection of storage capacitor C1, the other end of storage capacitor C1 forms positive voltage, i.e. U6 at the anode 124 of fluorescent tube 12.Then the anode 124 of fluorescent tube 12 and the moment superimposed voltage U14=U6-between the negative electrode 126 (U5)=U6+U5.The trigger electrode 128 of fluorescent tube 12 is under the acting in conjunction of the anode 124 of instantaneous trigger high pressure 20U7 that secondary coil L2 produces and fluorescent tube 12 and the moment superimposed voltage U14 between the negative electrode 126, and the xenon ionization formation Low ESRs in the fluorescent tube 12 are so that the anode 124 and negative electrode 126 conductings of fluorescent tube 12.After this storage capacitor C1 continues fluorescent tube 12 discharges so that fluorescent tube 12 is luminous once more.
Be appreciated that if the voltage difference of the anode of the fluorescent tube 12 that obtains by flash control circuit and negative electrode can reach pressing from lightning of fluorescent tube, then need not transformer T and trigger capacitor C 3 vibrations and can make lamp luminescence with generation instantaneous trigger high pressure.Can remove transformer T this moment and trigger capacitor C 3 to save cost.
Compared to prior art, the charging circuit of described flash control circuit is by first charging end and second charging end difference Receive first charging voltage and second charging voltage to storage capacitor and charging capacitor charging. After circuits for triggering receive triggering signal, Described circuits for triggering produce trigger voltage at the trigger electrode of described fluorescent tube, and storage capacitor produces positive electricity at the anode of described fluorescent tube simultaneously Pressure and charging capacitor produce negative voltage at tube cathode strengthens the anode of fluorescent tube and the voltage difference between the negative electrode, and and trigger voltage Acting in conjunction makes the anode of fluorescent tube and negative electrode conducting so that it is luminous. Described flash control circuit utilizes charging circuit to receive the Two charging voltages have improved the anode of fluorescent tube and the voltage between the negative electrode, make flash lamp energy stabilized illumination.
In addition, those skilled in the art can also do other variation in spirit of the present invention, and certainly, these are according to spirit of the present invention The variation of doing all should be included in the claimed range of the present invention.
Claims (9)
- [claim 1] a kind of flash control circuit, be used to control a lamp luminescence, described fluorescent tube has a trigger electrode, described flash control circuit comprises a charging circuit and circuits for triggering, described charging circuit comprises a storage capacitor, described charging circuit charges to described storage capacitor by receiving one first charging voltage, it is characterized in that, described charging circuit also comprises a charging capacitor, described charging circuit charges to described charging capacitor by receiving one second charging voltage, if described circuits for triggering receive a triggering signal from the outside, then described storage capacitor and described charging capacitor form voltage respectively at the two ends of described fluorescent tube, the trigger voltage that described circuits for triggering produce at the trigger electrode of described fluorescent tube triggers described fluorescent tube conducting so that described lamp luminescence simultaneously with the voltage of the two ends formation of described fluorescent tube.
- [claim 2] flash control circuit as claimed in claim 1, it is characterized in that, the two ends of described fluorescent tube have an anode and a negative electrode, described charging circuit comprises one first charging signals end and one second charging signals end, the two ends of described storage capacitor are respectively with the anode of described fluorescent tube and negative electrode links to each other and the anode of described fluorescent tube is connected to the described first charging signals end, the two ends of described charging capacitor link to each other with described tube cathode and the described second charging signals end respectively, described charging circuit is received charging signals by the described first charging signals termination described first storage capacitor is charged, and described charging circuit is received charging signals by the described second charging signals termination described charging capacitor is charged.
- [claim 3] flash control circuit as claimed in claim 2, it is characterized in that, described charging circuit also comprises one first rectifier diode and one second rectifier diode, the positive pole of described first rectifier diode links to each other with the described first charging signals end, the negative pole of described first rectifier diode links to each other with the anode of described fluorescent tube, the positive pole of described second rectifier diode links to each other with the described second charging signals end, and the two ends of described charging capacitor link to each other with the negative pole of described tube cathode and described second rectifier diode respectively.
- [claim 4] flash control circuit as claimed in claim 3, it is characterized in that, described circuits for triggering comprise a trigger end, an igbt, one is triggered electric capacity and a transformer, described transformer comprises a primary coil and a secondary coil, the grid of described igbt links to each other with described trigger end, the two ends of described triggering electric capacity link to each other with the collector electrode of described igbt and an end of described primary coil respectively, the other end ground connection of described primary coil, one end of described secondary coil links to each other with the trigger electrode of described fluorescent tube, the other end ground connection of described secondary coil, when the grid utmost point of described igbt received described triggering signal conducting, described triggering electric capacity and the vibration of described transformer produced trigger voltage at the trigger electrode of described fluorescent tube.
- [claim 5] flash control circuit as claimed in claim 4, it is characterized in that, described charging circuit also comprises one first current-limiting resistance, one second current-limiting resistance and one the 3rd current-limiting resistance, the two ends of described first current-limiting resistance link to each other with the negative pole of described first rectifier diode and the collector electrode of described igbt respectively, the two ends of described second current-limiting resistance link to each other with the negative pole of described second rectifier diode and an end of described charging capacitor respectively, the other end of described charging capacitor links to each other with the negative electrode of described fluorescent tube, and the two ends of described the 3rd current-limiting resistance link to each other and common ground with the negative electrode of described fluorescent tube and the other end of described secondary coil respectively.
- [claim 6] flash control circuit as claimed in claim 4, it is characterized in that, described circuits for triggering also comprise a transistor, the base stage of described transistor links to each other with the grid of described igbt and is connected to described trigger end jointly, the collector electrode of described transistor is connected between the negative pole and described charging capacitor of described second rectifier diode, the grounded emitter of described transistor, when the base stage of described transistor receives the triggering signal conducting, described charging capacitor forms negative voltage at the negative electrode of described fluorescent tube, described storage capacitor produces positive voltage at the anode of described fluorescent tube, and the trigger voltage of the superimposed voltage of the positive voltage of the anode of described fluorescent tube and the negative voltage of negative electrode and the trigger electrode of described fluorescent tube triggers the anode of described fluorescent tube and negative electrode conducting simultaneously so that described lamp luminescence.
- [claim 7] flash control circuit as claimed in claim 6, it is characterized in that, described circuits for triggering also comprise a diode, and the positive pole of described diode links to each other with the negative electrode of described fluorescent tube, and the negative pole of described diode links to each other with the collector electrode of described transistor.
- [claim 8] flash control circuit as claimed in claim 7, it is characterized in that, described charging circuit also comprises an auxiliary charging electric capacity, the two ends of described auxiliary charging electric capacity link to each other with the negative pole of described second rectifier diode and the emitter of described transistor respectively, described charging circuit charges to described charging capacitor and described auxiliary charging electric capacity simultaneously by receiving described second charging voltage, after described charging capacitor discharge, described auxiliary charging electric capacity charges to described charging capacitor.
- [claim 9] flash control circuit as claimed in claim 8 is characterized in that the capacitance of described auxiliary charging electric capacity is greater than the capacitance of described charging capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710203438XA CN101472365B (en) | 2007-12-27 | 2007-12-27 | Flash control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710203438XA CN101472365B (en) | 2007-12-27 | 2007-12-27 | Flash control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101472365A true CN101472365A (en) | 2009-07-01 |
| CN101472365B CN101472365B (en) | 2012-01-25 |
Family
ID=40829397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710203438XA Expired - Fee Related CN101472365B (en) | 2007-12-27 | 2007-12-27 | Flash control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101472365B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108207053A (en) * | 2016-12-16 | 2018-06-26 | 施耐德电气工业公司 | driving circuit |
| WO2023143381A1 (en) * | 2022-01-25 | 2023-08-03 | 维沃移动通信有限公司 | Flash lamp circuit, control method, electronic device, and readable storage medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056973A (en) * | 1990-05-29 | 1991-12-11 | 张俊兴 | Safe marker lamp |
| KR100340942B1 (en) * | 1995-01-06 | 2002-11-30 | 삼성테크윈 주식회사 | Flash device charged within short time |
-
2007
- 2007-12-27 CN CN200710203438XA patent/CN101472365B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108207053A (en) * | 2016-12-16 | 2018-06-26 | 施耐德电气工业公司 | driving circuit |
| CN108207053B (en) * | 2016-12-16 | 2019-11-26 | 施耐德电气工业公司 | Driving circuit |
| WO2023143381A1 (en) * | 2022-01-25 | 2023-08-03 | 维沃移动通信有限公司 | Flash lamp circuit, control method, electronic device, and readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101472365B (en) | 2012-01-25 |
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Effective date of registration: 20160118 Address after: Tianhe District Tong East Road Guangzhou city Guangdong province 510665 B-101 No. 5, room B-118 Patentee after: Guangdong Gaohang Intellectual Property Operation Co., Ltd. Address before: 528051, No. 1, Changhong East Road, Chengxi Industrial Zone, Zhangcha Town, Guangdong, Foshan Patentee before: Pulihua Science & Technology Co., Ltd., Foshan Patentee before: Hon Hai Precision Industry Co., Ltd. |
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Effective date of registration: 20161027 Address after: Tiandeng County Road 532800 the Guangxi Zhuang Autonomous Region Tiandeng town peace Chongzuo City No. 009 Patentee after: Xu Haibo Address before: Tianhe District Tong East Road Guangzhou city Guangdong province 510665 B-101 No. 5, room B-118 Patentee before: Guangdong Gaohang Intellectual Property Operation Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20161227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |