CN100498889C - Filament spot circuit of vacuum fluorescent display screen - Google Patents
Filament spot circuit of vacuum fluorescent display screen Download PDFInfo
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- CN100498889C CN100498889C CNB2007100672583A CN200710067258A CN100498889C CN 100498889 C CN100498889 C CN 100498889C CN B2007100672583 A CNB2007100672583 A CN B2007100672583A CN 200710067258 A CN200710067258 A CN 200710067258A CN 100498889 C CN100498889 C CN 100498889C
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Abstract
A lightening circuit of lamp filament on vacuum fluorescent display screen is prepared as utilizing the starting-stopping character of capacity to couple energy onto lamp filament of vacuum fluorescent display screen through capacity electric field mode to make current flow through lamp filament of vacuum fluorescent display screen for realizing purpose of heating lamp filament.
Description
Technical field
The present invention relates to vacuum and show the field, especially, relate to a kind of vacuum fluorescent display screen (VFD) filament spot circuit.
Background technology
At present, known filament spot circuit of vacuum fluorescent display screen need be worked floatingly, in actual applications, as automobile, outdoor portable apparatus, household electrical appliances, industry control etc., generally adopt the DC-AC translation circuit to obtain pulse voltage and power supply is provided for the vacuum fluorescent display screen filament.And adopt the DC-AC translation circuit to need a transformer, transformer transmits energy by magnetic field, the use transformer is finished the isolation of power supply and is designed floatingly, two windings just must be arranged, i.e. former limit winding and secondary winding, and former limit winding is to need the electric current of variation could induce alternating magnetic fields on magnetic material, and then induction electromotive force arranged just on the secondary winding, on rich group of secondary the electric current and voltage energy is arranged, just can light the VFD filament, and the electric current of former limit winding changes, and is to need oscillating circuit to provide, IC perhaps of the same type provides, the signal energy that oscillating circuit provides out is generally all more weak, is difficult to reach the demand of transmitting energy on transformer, so just must add a power tube and promote, the voltage of secondary winding will be stablized, just must feed back to the oscillating circuit control of getting on relatively, will use optocoupler and voltage-reference, like this since component number on the circuit just very many, bulky, cause the circuit cost height, the output voltage instability; And design, manufacture difficulty is big.
Summary of the invention
The objective of the invention is to,, provide a kind of filament spot circuit of vacuum fluorescent display screen at prior art cost height, big, the unsettled deficiency of output voltage of volume.
The technical solution adopted for the present invention to solve the technical problems is: a kind of filament spot circuit of vacuum fluorescent display screen, and it mainly is made up of resistance R 1-R2, capacitor C 1-C3 and diode D1-D4; Resistance R 1 one ends link to each other with capacitor C 1 one ends, capacitor C 1 other end is connected with each other with the anode of diode D1 and the negative electrode of diode D2 respectively, the negative electrode of the negative electrode of diode D1 and diode D3, resistance R 2, capacitor C 3 are connected with each other, the anode of the anode of the other end of the other end of resistance R 2 and capacitor C 3, diode D2, diode D4 is connected with each other, the negative electrode of the anode of diode D3 and diode D4 and capacitor C 2 are connected with each other, the other end ground connection of capacitor C 2; The two ends of described vacuum fluorescent display screen filament are connected on respectively on the two ends of capacitor C 3.
Further, the resistance of described resistance R 1 is 0-30 Ω, and the resistance of resistance R 2 is 8-10K Ω, and the appearance value of capacitor C 1, C2 is 1-10uF, and the appearance value of capacitor C 3 is 20000pF-10uF, and diode D1-D4 is 1N4148 or 1N4144.
The present invention can also realize the present invention by adopting following technical scheme: a kind of filament spot circuit of vacuum fluorescent display screen, and it mainly is made up of resistance R 11-R12 and capacitor C 11-C14; Resistance R 11 1 ends link to each other with capacitor C 11 1 ends, and capacitor C 11 other ends are connected with each other with resistance R 12, capacitor C 13 respectively, and the other end and the capacitor C 12 of the other end of resistance R 12 and capacitor C 13 are connected with each other, the other end ground connection of capacitor C 12; The two ends of described vacuum fluorescent display screen filament are connected on respectively on the two ends of capacitor C 13.
Further, the resistance of described resistance R 11 is 0-30 Ω, and the resistance of resistance R 12 is 8-10K Ω, and the appearance value of capacitor C 11, C12 is 1-10uF, and the appearance value of capacitor C 13 is 1000-20000pF.
The invention has the beneficial effects as follows: the present invention utilizes the logical friendship of electric capacity every straight characteristic, the mode of energy by capacitive field is coupled on the vacuum fluorescent display screen filament, make electric current flow through the vacuum fluorescent display screen filament, reach the purpose of heat filament, adopt the present invention can simplify circuit, reduced volume reduces cost, makes voltage stable; And can reduce circuit fabrication production difficulty, enhance productivity.
Description of drawings
Further specify the present invention below in conjunction with drawings and Examples, it is more obvious that purpose of the present invention and effect will become.
Fig. 1 is the circuit theory diagrams of the embodiment of the invention one;
Fig. 2 is the DC application exemplary plot of the embodiment of the invention one;
Fig. 3 is the circuit theory diagrams of the embodiment of the invention two;
Fig. 3 is the AC applications exemplary plot of the embodiment of the invention two.
Embodiment:
Embodiment one
The present invention can adopt the direct drive pattern, in system power supply (as 3.3V, 2.5V, 1.8V, 1.2V etc.) get one-period pulsewidth energy on the DC-DC circuit, use electric capacity every straight principle (electric capacity comes the characteristic of delivered current by electric field), respectively add a capacitance on the ground in positive pulse and power supply, reach purpose with logic working ground electric insulation, resistance of string before capacitance, to adjust pulse energy, reach the brightness of adjusting vacuum fluorescent display screen, the size of its coupling energy of appearance value size decision of capacitance, add bridge rectifier in the capacitance rear end, again and add a capacitor filtering, pulse can be become direct current, again and add a big resistance resistance, with the unnecessary electric charge of releasing, finish the filament direct drive pattern of vacuum fluorescent display screen.
Particularly, as shown in Figure 1, filament spot circuit of vacuum fluorescent display screen is the direct drive mode circuit, and it mainly is made up of resistance R 1-R2, capacitor C 1-C3 and diode D1-D4; Resistance R 1 one ends link to each other with the pulse input signal line, the other end links to each other with capacitor C 1, capacitor C 1 other end is connected with each other with the anode of diode D1 and the negative electrode of diode D2 respectively, the negative electrode of the negative electrode of diode D1 and diode D3, resistance R 2, capacitor C 3 are connected with each other, the anode of the anode of the other end of the other end of resistance R 2 and capacitor C 3, diode D2, diode D4 is connected with each other, the negative electrode of the anode of diode D3 and diode D4 and capacitor C 2 are connected with each other, the other end ground connection of capacitor C 2.The two ends of vacuum fluorescent display screen filament are connected on respectively on the two ends of capacitor C 3.
As shown in Figure 2, pulse width controller can be adjusted the pulsewidth width automatically according to the output voltage of direct supply, to reach the purpose of direct supply output constant voltage.Among the figure, two metal-oxide-semiconductor Q1 and Q2 are subjected to pulse width controller control alternate conduction up and down, in the middle of two metal-oxide-semiconductors, form the square wave that has DC component.And direct supply is to be provided with according to the needs on the side circuit, and the effective value of intermediate energy square wave is followed the direct supply value and is fixed on the steady state value, and then the VFD filament is powered on be pressed with the effect value stabilization.Get this square wave, the logical friendship that utilizes electric capacity is coupled to the mode of energy by capacitive field on the VFD filament every straight characteristic, make electric current flow through the VFD filament, reach the purpose of heat filament, because of electronics can not be by the insulating medium of electric capacity, can only pass through the field coupled energy, so electric going up realizes suspending.
Each component parameters is as follows, two metal-oxide-semiconductor Q1 and Q2 can be IRL7833, NTD110N02R or AO4406 up and down, the voltage of battery supply is 3.3-12V, inductance L 1 is 1-4.7uH, the resistance of resistance R 1 is 0-30 Ω, and the resistance of resistance R 2 is 8-10K Ω, and the appearance value of capacitor C 1, C2 is 1-10uF, the appearance value of capacitor C 3 is 20000pF-10uF, and diode D1-D4 is BAT54S, 1N4148 or 1N4144.
Because this programme circuit is to extract the energy pulse power supply on DC-DC, the DC-DC circuit supply is stable, and response speed is fast, and the quality height so effective value voltage is stable, is not imported the influence that power supply just floats, and realizes that supplied by AC/DC electricity is compatible convenient.
Embodiment two
The present invention also can adopt the AC driving pattern.AC driving pattern principle is as follows: resistance of string before capacitance, to adjust pulse energy, do not add the bridge rectifier bridge in the capacitance rear end, directly link on the two poles of the earth of filament of vacuum fluorescent display screen (VFD), again and add a big resistance resistance, with the unnecessary electric charge of releasing, be the Alternating Current Power Supply pattern.
Particularly, as shown in Figure 3, filament spot circuit of vacuum fluorescent display screen of the present invention is the AC driving mode circuit, and it mainly is made up of resistance R 11-R12 and capacitor C 11-C13; Resistance R 11 1 ends link to each other with the pulse input signal line, the other end links to each other with capacitor C 11, capacitor C 11 other ends are connected with each other with resistance R 12, capacitor C 13 respectively, and the other end and the capacitor C 12 of the other end of resistance R 12 and capacitor C 13 are connected with each other, the other end ground connection of capacitor C 12.The two ends of vacuum fluorescent display screen filament are connected on respectively on the two ends of capacitor C 13.
As shown in Figure 4, pulse width controller can be adjusted the pulsewidth width automatically according to the output voltage of direct supply, to reach the purpose of direct supply output constant voltage.Among the figure, two metal-oxide-semiconductor Q11 and Q12 are subjected to pulse width controller control alternate conduction up and down, in the middle of two metal-oxide-semiconductors, form the square wave that has DC component.And direct supply is to be provided with according to the needs on the side circuit, and the effective value of intermediate energy square wave is followed the direct supply value and is fixed on the steady state value, and then the VFD filament is powered on be pressed with the effect value stabilization.Get this square wave, the logical friendship that utilizes electric capacity is coupled to the mode of energy by capacitive field on the VFD filament every straight characteristic, make electric current flow through the VFD filament, reach the purpose of heat filament, because of electronics can not be by the insulating medium of electric capacity, can only pass through the field coupled energy, so electric going up realizes suspending.
Each component parameters is as follows, two metal-oxide-semiconductor Q11 and Q12 can be IRL7833, NTD110N02R or AO4406 up and down, the voltage of battery supply is 3.3-12V, inductance L 11 is 1-4.7uH, the resistance of resistance R 11 is 0-30 Ω, the resistance of resistance R 12 is 8-10K Ω, and the appearance value of capacitor C 11, C12 is 1-10uF, and the appearance value of capacitor C 13 is 1000-20000pF.
Current return: positive half cycle, electric current by the interconnection point of Q1 and Q2, by capacitor C 11 → filament → capacitor C 12 → ground, is finished the charging process of positive half cycle earlier, and electric current flows through filament.Because of the inside dc impedance of electric capacity is infinitely great, AC impedance is a finite value, electric current is when flowing through electric capacity, and the generation loss is limited, and the internal resistance of filament is a finite value, the impedance of electric capacity on ac circuit, more much smaller than the impedance of filament on circuit, can disregard, electric current can produce heat when flowing through filament, discharge electronics, the impact fluorescence powder is luminous.Finish positive half cycle current to the heating of filament and the process of release electronics.
The negative half-cycle current loop, electric current by the interconnection point of capacitor C 12 → filament → capacitor C 11 → Q1 and Q2, is finished the discharge process of negative half period earlier by ground.Electric current can produce heat when flowing through filament, discharge electronics, and the impact fluorescence powder is luminous.Finish negative half-cycle current to the heating of filament and the process of release electronics.
Except that the described technical characterictic of instructions, be the known technology of those skilled in the art.
The foregoing description is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the utility model is made all fall into protection scope of the present invention.
Claims (4)
1. a direct drive formula filament spot circuit of vacuum fluorescent display screen is characterized in that, it mainly is made up of resistance R 1-R2, capacitor C 1-C3 and diode D1-D4; Resistance R 1 one ends link to each other with capacitor C 1 one ends, capacitor C 1 other end is connected with each other with the anode of diode D1 and the negative electrode of diode D2 respectively, the negative electrode of the negative electrode of diode D1 and diode D3, resistance R 2, capacitor C 3 are connected with each other, the anode of the anode of the other end of the other end of resistance R 2 and capacitor C 3, diode D2, diode D4 is connected with each other, the negative electrode of the anode of diode D3 and diode D4 and capacitor C 2 are connected with each other, the other end ground connection of capacitor C 2; The two ends of described vacuum fluorescent display screen filament are connected on respectively on the two ends of capacitor C 3.
2. direct drive formula filament spot circuit of vacuum fluorescent display screen according to claim 1, it is characterized in that, the resistance of described resistance R 1 is 0-30 Ω, the resistance of resistance R 2 is 8-10K Ω, the appearance value of capacitor C 1, C2 is 1-10uF, the appearance value of capacitor C 3 is 20000pF-10uF, and diode D1-D4 is 1N4148 or 1N4144.
3. an AC drive type filament spot circuit of vacuum fluorescent display screen is characterized in that, it mainly is made up of resistance R 11-R12 and capacitor C 11-C13; Resistance R 11 1 ends link to each other with capacitor C 11 1 ends, and capacitor C 11 other ends are connected with each other with resistance R 12, capacitor C 13 respectively, and the other end and the capacitor C 12 of the other end of resistance R 12 and capacitor C 13 are connected with each other, the other end ground connection of capacitor C 12; The two ends of described vacuum fluorescent display screen filament are connected on respectively on the two ends of capacitor C 13.
4. AC drive type filament spot circuit of vacuum fluorescent display screen according to claim 3, it is characterized in that the resistance of described resistance R 11 is 0-30 Ω, the resistance of resistance R 12 is 8-10K Ω, the appearance value of capacitor C 11, C12 is 1-10uF, and the appearance value of capacitor C 13 is 1000-20000pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100672583A CN100498889C (en) | 2007-02-14 | 2007-02-14 | Filament spot circuit of vacuum fluorescent display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100672583A CN100498889C (en) | 2007-02-14 | 2007-02-14 | Filament spot circuit of vacuum fluorescent display screen |
Publications (2)
| Publication Number | Publication Date |
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| CN101030343A CN101030343A (en) | 2007-09-05 |
| CN100498889C true CN100498889C (en) | 2009-06-10 |
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| CNB2007100672583A Expired - Fee Related CN100498889C (en) | 2007-02-14 | 2007-02-14 | Filament spot circuit of vacuum fluorescent display screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101477144B (en) * | 2009-01-20 | 2011-05-11 | 上海电力学院 | Confirmation for filament emission current computing method of vacuum fluorescent display |
| CN108932924B (en) * | 2017-05-25 | 2023-05-23 | 上海璞丰光电科技有限公司 | Novel topological structure vacuum fluorescent screen power supply |
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Granted publication date: 20090610 Termination date: 20190214 |