CN101472365B - Flash control circuit - Google Patents
Flash control circuit Download PDFInfo
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- CN101472365B CN101472365B CN200710203438XA CN200710203438A CN101472365B CN 101472365 B CN101472365 B CN 101472365B CN 200710203438X A CN200710203438X A CN 200710203438XA CN 200710203438 A CN200710203438 A CN 200710203438A CN 101472365 B CN101472365 B CN 101472365B
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- charging
- voltage
- fluorescent tube
- capacitor
- trigger
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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
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- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Stroboscope Apparatuses (AREA)
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 through 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 receives volume owing to the design of the triggering transformer of circuits for triggering is designed to elongated shape, causes the air magnetic circuit elongated, inefficient, 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.Said flash control circuit comprises a charging circuit and circuits for triggering.Said charging circuit comprises a storage capacitor and a charging capacitor.Said charging circuit charges to said storage capacitor through receiving one first charging voltage, and receives one second charging voltage said charging capacitor is charged.If said circuits for triggering receive a triggering signal from the outside, then said storage capacitor and said charging capacitor form voltage at the two ends of said fluorescent tube respectively.The trigger voltage that said circuits for triggering produce at the trigger electrode of said fluorescent tube triggers said fluorescent tube conducting so that said lamp luminescence simultaneously with the voltage of the two ends formation of said 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, said circuits for triggering produced anode and negative electrode conducting that voltage that trigger voltage and said charging circuit produce at the two ends of fluorescent tube makes fluorescent tube so that it is luminous at the trigger electrode of said fluorescent tube.Described flash control circuit utilizes charging circuit to receive the voltage that second charging voltage has improved lamp tube ends, makes photoflash lamp ability 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
To combine accompanying drawing that embodiment of the present invention is done further to specify below.
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.Said charging circuit 20 is used for photoflash lamp 10 chargings.Said circuits for triggering 40 are used for to photoflash lamp 10 trigger voltage being provided.
Said 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 this execution mode, the transformation ratio of setting primary coil L1 and secondary coil L2 is 1: 20.The base stage of said transistor Q1 links to each other with the grid of said igbt Q2 and is connected to a triggering signal end S3 jointly through resistance R 4 and is used for triggering signal of reception from the outside.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 through judgement 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 of collector electrode and transformer T that capacitor C 3 is connected in series in igbt Q2.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 this execution mode, the first rectifier diode D1 in the charging circuit 20 receives first charging voltage through 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 through 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 this execution mode, 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.The voltage U 12=U1-that then moment superposes 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 preflashing triggering signal and main and dodges triggering signal and carry 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 between the emitter of the negative pole of the second rectifier diode D2 and transistor Q1, to connect an auxiliary charging capacitor C 4; Other structures are identical with first execution mode, repeat no more at this.
In this execution mode, 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 the 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 through 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 receives first charging voltage respectively through first charging end and second charging end and second charging voltage is charged to storage capacitor and charging capacitor.After circuits for triggering receive triggering signal; Said circuits for triggering produce trigger voltage at the trigger electrode of said fluorescent tube; Simultaneously storage capacitor produces positive voltage and charging capacitor at the anode of said fluorescent tube and produces negative voltage at tube cathode the anode of fluorescent tube and the voltage difference between the negative electrode are strengthened, and the anode and the negative electrode conducting that make fluorescent tube with the trigger voltage acting in conjunction are so that it is luminous.Described flash control circuit utilizes charging circuit to receive second charging voltage to have improved the anode of fluorescent tube and the voltage between the negative electrode, makes the photoflash lamp can stabilized illumination.
In addition, those skilled in the art can also do other variation in spirit of the present invention, and certainly, these all should be included within the present invention's scope required for protection according to the variation that the present invention's spirit is done.
Claims (2)
1. flash control circuit; Be used to control a lamp luminescence, said fluorescent tube has a trigger electrode, and said flash control circuit comprises a charging circuit and circuits for triggering; Said charging circuit comprises a storage capacitor; Said charging circuit charges to said storage capacitor through receiving one first charging voltage, it is characterized in that said charging circuit also comprises a charging capacitor; Said charging circuit charges to said charging capacitor through receiving one second charging voltage; If said circuits for triggering receive a triggering signal from the outside, then said storage capacitor and said charging capacitor form voltage at the two ends of said fluorescent tube respectively, and the voltage of the trigger voltage that said circuits for triggering produce at the trigger electrode of said fluorescent tube and the two ends formation of said fluorescent tube triggers said fluorescent tube conducting simultaneously so that said lamp luminescence; The two ends of said fluorescent tube have an anode and a negative electrode; Said charging circuit also comprises one first current-limiting resistance, second current-limiting resistance, the 3rd current-limiting resistance, first rectifier diode and one second rectifier diode; Said charging circuit also comprises first charging end of an anode that is connected to this first rectifier diode and second charging end of an anode that is connected to this second rectifier diode; One end of said storage capacitor is connected to anode and the other end are connected to said fluorescent tube through the 3rd current-limiting resistance negative electrode; The anode of said fluorescent tube is connected to the negative electrode of said first rectifier diode, and an end of said charging capacitor is connected to said tube cathode and the other end and is connected to the negative electrode of said second rectifier diode through this second current-limiting resistance, and said charging circuit receives first charging voltage through said first charging end said storage capacitor is charged; Said charging circuit receives second charging voltage through said second charging end said charging capacitor is charged; Said circuits for triggering comprise a trigger end, an igbt, a triggering electric capacity, a transformer, a transistor and one the 3rd diode, and said transformer comprises a primary coil and a secondary coil, and the grid of said igbt links to each other with said trigger end; The collector electrode of said igbt is connected to the negative pole of said first rectifier diode through said first current-limiting resistance; The two ends of said triggering electric capacity link to each other with the collector electrode of said igbt and an end of said primary coil respectively, the other end ground connection of said primary coil, and an end of said secondary coil links to each other with the trigger electrode of said fluorescent tube; The other end ground connection of said secondary coil; Said storage capacitor connects an end ground connection of the 3rd current-limiting resistance, and when the gate of said igbt received said triggering signal conducting, said triggering electric capacity and the vibration of said transformer were with the trigger electrode generation trigger voltage to said fluorescent tube; The base stage of said transistor is connected to said trigger end through a resistance; The collector electrode of said transistor is connected between said second current-limiting resistance and the said charging capacitor, and the grounded emitter of said transistor is when the base stage of said transistor receives the triggering signal conducting; Said charging capacitor forms negative voltage at the negative electrode of said fluorescent tube; Said storage capacitor produces positive voltage at the anode of said fluorescent tube, and the trigger voltage of the superimposed voltage of the positive voltage of the anode of said fluorescent tube and the negative voltage of negative electrode and the trigger electrode of said fluorescent tube triggers anode and the negative electrode conducting of said fluorescent tube simultaneously so that said lamp luminescence, and the positive pole of said the 3rd diode links to each other with the negative electrode of said fluorescent tube; The negative pole of said the 3rd diode links to each other with the collector electrode of said igbt; Said charging circuit also comprises an auxiliary charging electric capacity, and the two ends of said auxiliary charging electric capacity link to each other with the negative pole of said second rectifier diode and the emitter of said transistor respectively, and said charging circuit charges to said charging capacitor and said auxiliary charging electric capacity through receiving said second charging voltage simultaneously; After said charging capacitor discharge, said auxiliary charging electric capacity charges to said charging capacitor.
2. flash control circuit as claimed in claim 1 is characterized in that the capacitance of said auxiliary charging electric capacity is greater than the capacitance of said 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 CN101472365A (en) | 2009-07-01 |
| CN101472365B true CN101472365B (en) | 2012-01-25 |
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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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108207053B (en) * | 2016-12-16 | 2019-11-26 | 施耐德电气工业公司 | Driving circuit |
| CN114442402B (en) * | 2022-01-25 | 2024-05-03 | 维沃移动通信有限公司 | Flash lamp circuit, control method, electronic device, and readable storage medium |
| CN118019180B (en) * | 2024-04-09 | 2024-11-01 | 深圳市卓芯微科技有限公司 | Light circuit is polished to two strong pulse light fluorescent tubes |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056973A (en) * | 1990-05-29 | 1991-12-11 | 张俊兴 | Safe marker lamp |
| CN1156842A (en) * | 1995-01-06 | 1997-08-13 | 三星航空产业株式会社 | High-speed charge flash for camera |
-
2007
- 2007-12-27 CN CN200710203438XA patent/CN101472365B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056973A (en) * | 1990-05-29 | 1991-12-11 | 张俊兴 | Safe marker lamp |
| CN1156842A (en) * | 1995-01-06 | 1997-08-13 | 三星航空产业株式会社 | High-speed charge flash for camera |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2005-26161A 2005.01.27 |
| 王海夫 等."闪光灯的双倍阳极电压触发电路".《照相机》.2000,(第3期),第44页. |
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| Publication number | Publication date |
|---|---|
| CN101472365A (en) | 2009-07-01 |
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| SE01 | Entry into force of request for substantive examination | ||
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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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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20161227 |