CN202976774U - Boost circuit driving vacuum fluorescent display - Google Patents
Boost circuit driving vacuum fluorescent display Download PDFInfo
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- CN202976774U CN202976774U CN201220481132.7U CN201220481132U CN202976774U CN 202976774 U CN202976774 U CN 202976774U CN 201220481132 U CN201220481132 U CN 201220481132U CN 202976774 U CN202976774 U CN 202976774U
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Abstract
The utility model discloses a boost circuit driving a vacuum fluorescent display. The boost circuit comprises an oscillation circuit for generating square waves with preset frequencies; a boost module electrically connected with the oscillation circuit and boosting the low voltages of input direct currents; and an adjusting module electrically connected with the boost module and making the boosted voltages stabilized so as to acquire required driving voltages. The boost circuit driving the vacuum fluorescent display has the advantages of simplicity and relatively low cost.
Description
Technical field
The utility model relates to Vacuum Fluorescent Display, particularly relates to a kind of booster circuit that vacuum fluorescence shows that drives.
Background technology
Vacuum fluorescence shows (Vacuum Fluorescent Display, VFD) be the display device that develops from radio tube, consisted of by the anode, aperture plate and the glass cover that stamp electrode and fluorescent powder on the negative electrode (directly-heated type, general designation filament) of electron emission, the grid that accelerates to control electron stream, glass substrate.It utilizes electron impact fluorescent powder, makes light-emitting phosphor, is a kind of self light-emitting display device.Owing to can drive with low-voltage, easily and integrated circuit supporting, so be widely used in the various fields such as household electrical appliance, business automation equipment, industrial instruments and automobile.
Therefore drive control because the VFD display uses integrated chip more and more, driving chip generally all needs the outside that the DC voltage of a 32V left and right is provided, and tradition generally provides this 32V voltage in the following ways.
Existing DC voltage is produced by a secondary winding of transformer.This mode need to adopt discrete power supply module and show that module is respectively used to supply and the demonstration of power supply, and discrete power supply module and demonstration module are on different pcb boards, so just needs to use winding displacement that two pcb boards are coupled together.In addition, use extra Transformer Winding, peripheral cell and socket etc. all can cause the various and cost of manufacturing process to occupy high.
In addition, this existing DC voltage can also adopt direct current conversion (DC-DC) integrated chip to provide, although adopt this mode not need more manufacturing process, cost is higher.
The utility model content
Based on this, be necessary to provide a kind of simple in structure, cost booster circuit of showing of low driving vacuum fluorescence again.
A kind of booster circuit that drives the vacuum fluorescence demonstration comprises: for generation of the oscillatory circuit with predeterminated frequency square wave; Boost module for the dc low-voltage to input boosts and processes is electrically connected to described oscillatory circuit; Be used for the voltage that boosts after processing is carried out the adjusting module that voltage stabilizing is processed, obtained needed driving voltage, be electrically connected to described boost module.
Therein in embodiment, described oscillatory circuit comprises the first triode and the second triode, described the first triode and the second triode are the NPN pipe, the base stage of described the first triode is connected to input power after being connected to collector by the first resistance more together, and the base stage of described the first triode also connects the collector of the second triode; The emitter of described the first triode is connected to by the second resistance after the emitter of described the second triode together by the 3rd resistance eutral grounding; The emitter of described the first triode also is connected to the base stage of the second triode afterwards more together by the first capacity earth by the 4th resistance; Described oscillatory circuit is by the described square wave with predeterminated frequency of emitter output of described the first triode.
Therein in embodiment, described boost module comprises inductance and the 3rd triode, described the 3rd triode is NPN pipe, the collector of described the 3rd triode by described inductance and the 5th resistance be connected to the dc low-voltage source, base stage is connected to described oscillatory circuit, grounded emitter by the second electric capacity parallel with one another and the 6th resistance; Voltage after described DC low-voltage is boosted in the collector output of described the 3rd triode.
In embodiment, described boost module also comprises diode and filter capacitor therein, and the anode of described diode is connected with the collector of described the 3rd triode, negative electrode is connected with described filter capacitor; The voltage of described boost module after by described the boosting of described diode output.
In embodiment, described adjusting module comprises the 7th resistance and stabilivolt therein, and described the 7th resistance is connected between the negative electrode of the negative electrode of described diode and described stabilivolt, the plus earth of described stabilivolt; The described needed driving voltage of negative electrode output of described stabilivolt.
In embodiment, described oscillatory circuit and described boost module share same power supply input therein, and described power supply input is as oscillatory circuit starting of oscillation voltage the time, also as the dc low-voltage of described input.
In embodiment, the magnitude of voltage of described power supply input is 12V therein.
The oscillatory circuit of the booster circuit that above-mentioned driving vacuum fluorescence shows and adopt driving voltage translation circuit that square wave boosts can adopt less components and parts to realize respectively separately function, not only circuit is simple, and cost is also lower.
Description of drawings
Fig. 1 is the booster circuit module map that the driving vacuum fluorescence of an embodiment shows;
Fig. 2 is the booster circuit schematic diagram that the driving vacuum fluorescence of Fig. 1 embodiment shows.
Embodiment
As shown in Figure 1, be the booster circuit of the driving vacuum fluorescence demonstration of an embodiment.This booster circuit 10 comprises oscillatory circuit 100 and driving voltage translation circuit 200, and described driving voltage translation circuit 200 is electrically connected to oscillatory circuit 100.Described oscillatory circuit 100 boosts the dc low-voltage of inputting to control described driving voltage varying circuit 200 for generation of the square wave with predeterminated frequency, is converted to needed driving voltage.
In the present embodiment, driving voltage translation circuit 200 comprises boost module 220 and adjusting module 240.Boost module 220 is electrically connected to oscillatory circuit 100, and corresponding according to the dutycycle of the square wave of described oscillatory circuit 100 outputs regulate this boost module 220 boost process after the voltage of output.Adjusting module 240 is electrically connected to boost module 220, and the voltage that described boost module 220 is boosted after processing carries out the voltage stabilizing processing, obtains described needed driving voltage.
Particularly, please refer to Fig. 2, oscillatory circuit 100 comprises the first triode Q1 and the second triode Q2.In present embodiment, described the first triode Q1 and the second triode Q2 are a NPN pipe.The base stage of described the first triode Q1 is connected to input power after being connected to collector by one first resistance R 1 more together, and the base stage of described the first triode Q1 also connects the collector of the second triode Q2; The emitter of described the first triode Q1 is connected to by one second resistance R 2 after the emitter of described the second triode Q2 together by one the 3rd resistance R 3 ground connection; The emitter of described the first triode Q1 also is connected to the base stage of the second triode Q2 afterwards more together by one first capacitor C 1 ground connection by one the 4th resistance R 4.Described oscillatory circuit 100 is by the described square wave with predeterminated frequency of emitter output of described the first triode Q1.
Further, boost module 220 also comprises diode D1 and filter capacitor C3, the anode of described diode D1 is connected with the collector of described the 3rd triode Q3, negative electrode is connected with described filter capacitor C3, and this boost module 220 can be by the voltage after described the boosting of this diode D1 output.In the present embodiment, add filter capacitor C3 to carry out filtering to the voltage that obtains, diode D1 is used for preventing that filter capacitor C3 discharges from the 3rd triode Q3 when the 3rd triode Q3 conducting.
Adjusting module 240 comprises the 7th resistance R 7 and stabilivolt D2, and described the 7th resistance R 7 is connected between the negative electrode of the negative electrode of described diode D1 and described stabilivolt D2, the plus earth of described stabilivolt D2; The described needed driving voltage of negative electrode output of described stabilivolt D2.
In the present embodiment, oscillatory circuit 100 shares same power supply input with described driving voltage translation circuit 200, when namely described power supply input is as oscillatory circuit 100 starting of oscillation voltage, also as the dc low-voltage of described input.The magnitude of voltage of described power supply input is 12V.In other embodiments, also can adopt different voltage input sources.
The principle of work of above-described embodiment below is described.
After the 12V power supply offers oscillatory circuit 100, make the first triode Q1 conducting by the first resistance R 1, the emitter output high level of the first triode Q1.Charge through 4 pairs of the first capacitor C 1 of the 4th resistance R after the first triode Q1 conducting, when the base voltage that is charged to the second triode Q2 surpasses emitter voltage 0.7V, the second triode Q2 conducting, thereby the first triode Q1 ends because base voltage descends, at this moment the emitter output low level of the first triode Q1.After this, when the first capacitor C 1 discharges into voltage Vbe between the basic emitter-base bandgap grading of the second triode Q2＜0.7V by the 4th resistance R 4, the second triode Q2 cut-off, thereby the first triode Q1 conducting because base voltage raises, the emitter of the first triode Q1 is exported again high level, so circulation is so just exported the square wave with certain frequency at the emitter of the first triode Q1.Simultaneously, can change the party's wave frequency by the value of regulating the first capacitor C 1 and the 4th resistance R 4.
The 12V power supply is also supplied with boost module 220 by current limliting the 5th resistance R 5.Input the base stage of the 3rd triode Q3 by the 6th resistance R 6 in parallel and the second capacitor C 2 by the square wave that oscillatory circuit 100 produces.When this square wave is positive half cycle, the 3rd triode Q3 conducting, 12V power supply → the 5th resistance R 5 → inductance L → the 3rd triode Q3 → GND forms the loop, realizes the inductance L charging energy-storing; When this square wave is negative half period, the 3rd triode Q3 cut-off, the back electromotive force that inductance L produces and mutual stack identical with 12V direct supply voltage direction obtained voltage higher than the 12V power supply at load end, boosts thereby complete.
Voltage through boost module 220 obtains required driving voltage through the 7th resistance R 7 and stabilivolt D2 voltage stabilizing, and for the VFD display, this voltage is 32V normally.
Can see, the circuit of above-described embodiment adopts less components and parts namely to realize voltage transformation, and not only circuit is simple, and cost is also lower.Be appreciated that, basis at above-described embodiment, oscillatory circuit and driving voltage translation circuit can also be made some conversion, as long as it can realize the function of oscillatory circuit and voltage transformation, for example the energy-storage travelling wave tube inductance of boost module can replace with electric capacity, and changes corresponding charging circuit and can realize equally boosting.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (7)
1. one kind drives the booster circuit that vacuum fluorescence shows, it is characterized in that, comprising:
For generation of the oscillatory circuit with predeterminated frequency square wave;
Boost module for the dc low-voltage to input boosts and processes is electrically connected to described oscillatory circuit;
Be used for the voltage that boosts after processing is carried out the adjusting module that voltage stabilizing is processed, obtained needed driving voltage, be electrically connected to described boost module.
2. the booster circuit that shows of driving vacuum fluorescence according to claim 1, it is characterized in that, described oscillatory circuit comprises the first triode and the second triode, described the first triode and the second triode are the NPN pipe, the base stage of described the first triode is connected to input power after being connected to collector by the first resistance more together, and the base stage of described the first triode also connects the collector of the second triode; The emitter of described the first triode is connected to by the second resistance after the emitter of described the second triode together by the 3rd resistance eutral grounding; The emitter of described the first triode also is connected to the base stage of the second triode afterwards more together by the first capacity earth by the 4th resistance; Described oscillatory circuit is by the described square wave with predeterminated frequency of emitter output of described the first triode.
3. the booster circuit that shows of driving vacuum fluorescence according to claim 2, it is characterized in that, described boost module comprises inductance and the 3rd triode, described the 3rd triode is NPN pipe, the collector of described the 3rd triode by described inductance and the 5th resistance be connected to the dc low-voltage source, base stage is connected to described oscillatory circuit, grounded emitter by the second electric capacity parallel with one another and the 6th resistance; Voltage after described DC low-voltage is boosted in the collector output of described the 3rd triode.
4. the booster circuit that shows of driving vacuum fluorescence according to claim 3, it is characterized in that, described boost module also comprises diode and filter capacitor, and the anode of described diode is connected with the collector of described the 3rd triode, negative electrode is connected with described filter capacitor; The voltage of described boost module after by described the boosting of described diode output.
5. the booster circuit that shows of driving vacuum fluorescence according to claim 4, it is characterized in that, described adjusting module comprises the 7th resistance and stabilivolt, and described the 7th resistance is connected between the negative electrode of the negative electrode of described diode and described stabilivolt, the plus earth of described stabilivolt; The described needed driving voltage of negative electrode output of described stabilivolt.
6. the booster circuit that shows of driving vacuum fluorescence according to claim 1, it is characterized in that, described oscillatory circuit and described boost module share same power supply input, and described power supply input is as oscillatory circuit starting of oscillation voltage the time, also as the dc low-voltage of described input.
7. the booster circuit of driving vacuum fluorescence demonstration according to claim 6, is characterized in that, the magnitude of voltage of described power supply input is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220481132.7U CN202976774U (en) | 2012-09-19 | 2012-09-19 | Boost circuit driving vacuum fluorescent display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220481132.7U CN202976774U (en) | 2012-09-19 | 2012-09-19 | Boost circuit driving vacuum fluorescent display |
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| Publication Number | Publication Date |
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| CN202976774U true CN202976774U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220481132.7U Expired - Fee Related CN202976774U (en) | 2012-09-19 | 2012-09-19 | Boost circuit driving vacuum fluorescent display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108932924A (en) * | 2017-05-25 | 2018-12-04 | 上海璞丰光电科技有限公司 | A kind of vacuum fluorescence screen power supply of novel topological structure |
-
2012
- 2012-09-19 CN CN201220481132.7U patent/CN202976774U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108932924A (en) * | 2017-05-25 | 2018-12-04 | 上海璞丰光电科技有限公司 | A kind of vacuum fluorescence screen power supply of novel topological structure |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20210919 |
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| CF01 | Termination of patent right due to non-payment of annual fee |