CN202584682U - VFD filament voltage generation circuit - Google Patents
VFD filament voltage generation circuit Download PDFInfo
- Publication number
- CN202584682U CN202584682U CN201120521540.6U CN201120521540U CN202584682U CN 202584682 U CN202584682 U CN 202584682U CN 201120521540 U CN201120521540 U CN 201120521540U CN 202584682 U CN202584682 U CN 202584682U
- Authority
- CN
- China
- Prior art keywords
- voltage
- resistance
- triode
- circuit
- vfd
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
The utility model discloses a VFD filament voltage generation circuit which includes a first voltage input terminal, an oscillating circuit, a push-pull circuit, a VFD filament voltage adjusting circuit, a first voltage output terminal, and a second voltage output terminal. The oscillating circuit carries out the oscillation treatment to the voltage of the first voltage input terminal, and then outputs a first square wave voltage. The push-pull circuit carries out the amplification treatment to the first square wave voltage, and then outputs a second square wave voltage. The VFD filament voltage adjusting circuit adjusts the voltage of the second square wave voltage, and then outputs the voltage to the two terminals of a VFD filament via the first voltage output terminal and the second voltage output terminal. The VFD filament voltage generation circuit reduces the area occupied by the VFD filament voltage generation circuit on a PCB, so the cost is reduced, and the voltage of the VFD filament can be adjusted flexibly.
Description
Technical field
The utility model relates to the VFD technical field of circuit, relates in particular to a kind of VFD filament voltage and produces circuit.
Background technology
VFD (Vacuum Fluorescent Display, vacuum fluorescent display screen) is made up of the anode and the glass lid that stamp electrode and fluorescent powder on the negative electrode (directly-heated type, general designation filament) of emitting electrons, the grid that quickens the control electron stream, the glass substrate.If the overtension of VFD negative electrode; It is the overtension of VFD filament; Then the temperature of VFD filament can rise, and the rising of VFD filament temperature will speed up the evaporation of oxide on the VFD tungsten filament stamen line, the surface that also will pollute the VFD phosphor anode simultaneously; Luminescence efficiency and the brightness of VFD are descended, thereby cause the lost of life of VFD; If the brownout of VFD negative electrode; It is the brownout of VFD filament; Then the temperature of VFD filament can descend, and causes the negative electrode of VFD can't launch sufficient amount and stable thermoelectron, causes the display quality that weakens VFD; Or cause VFD filament voltage fluctuation and make the display brightness of VFD unstable, and if the VFD filament under the condition of low-voltage, work for a long time and also can cause the reliability decrease of VFD.Therefore, the voltage swing of VFD filament is vital for the operate as normal of VFD, the voltage of VFD filament should be set in its rated voltage ± 10% scope in.
Yet in the prior art, the voltage of VFD filament is that an independent winding by transformer produces; And when design circuit, produce circuit design to the VFD filament voltage on a pcb board usually, the circuit design that contains VFD on another pcb board; Thereby the winding displacement that needs 2pin connects the VFD filament voltage produces circuit and the pcb board that contains VFD; And the length of this winding displacement is different because of the different circuits demand, and the length of this winding displacement is long more, and its cost is just high more.Therefore produce the mode of VFD filament voltage through transformer, its cost is high, and required pcb board area is bigger, and can not adjust neatly the size of VFD filament voltage, thereby can not satisfy the different voltage requirements of different VFD flexibly.
The utility model content
The fundamental purpose of the utility model provides the low and VFD filament voltage that can adjust flexibly the VFD filament voltage of a kind of cost and produces circuit.
In order to achieve the above object; The utility model proposes a kind of VFD filament voltage and produces circuit; Comprise first voltage input end, oscillatory circuit, push-pull circuit, the adjustment of VFD filament voltage circuit, first voltage output end and second voltage output end; Said first voltage input end is connected with said oscillatory circuit, and said oscillatory circuit carries out oscillation treatment to the voltage of said first voltage input end, output first party wave voltage; Said push-pull circuit carries out processing and amplifying to said first party wave voltage; Output second party wave voltage, said VFD filament voltage adjustment circuit is adjusted the magnitude of voltage of said second party wave voltage, is defeated by the two ends of VFD filament through said first voltage output end and second voltage output end.
Preferably, said VFD filament voltage produces circuit and also comprises second voltage input end and tertiary voltage input end, and said second voltage input end is connected with said push-pull circuit, and said tertiary voltage input end is connected with said VFD filament voltage adjustment circuit.
Preferably; Said oscillatory circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, first triode, second triode and first electric capacity; One end of said first resistance is connected with said first input voltage; The other end is connected with the base stage of said first triode and the collector of said second triode respectively; The collector of said first triode is connected with said first input voltage; The base stage of said second triode through said second resistance be connected with the emitter of said first triode, through said first capacity earth, the emitter of said second triode through said the 3rd resistance be connected with the emitter of said first triode, through said the 4th resistance eutral grounding.
Preferably; Said push-pull circuit comprises the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 3rd triode, the 4th triode, the 5th triode and second electric capacity; Said the 5th resistance and said second electric capacity are parallel with one another; The one of which common port is connected with said oscillatory circuit; Another common port is connected with the base stage of said the 3rd triode and through said the 6th resistance eutral grounding, the collector of said the 3rd triode is connected with the base stage of said the 4th triode and the base stage of the 5th triode respectively, and the collector of said the 3rd triode also is connected with said second input voltage through the 7th resistance and the 8th resistance; The grounded emitter of said the 3rd triode; The collector of said the 4th triode is connected with said second input voltage, and the emitter of said the 4th triode is connected with the emitter of said the 5th triode, the grounded collector of said the 5th triode.
Preferably; Said VFD filament voltage adjustment circuit comprises the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, first polar capacitor, second polar capacitor and voltage stabilizing diode; The positive pole of said first polar capacitor is connected with said push-pull circuit; The negative pole of said first polar capacitor is connected with said second voltage output end and is connected with said first voltage output end through said the 9th resistance, the tenth resistance and the 12 resistance through said the 13 resistance respectively; One end of said voltage stabilizing diode is connected between said the 9th resistance and said the tenth resistance; The other end is connected with said the 3rd input voltage, and an end of said the 11 resistance is connected between said the 9th resistance and said the tenth resistance, other end ground connection; The negative pole of said second polar capacitor is connected between said the tenth resistance and said the 12 resistance, the plus earth of said second polar capacitor.
Preferably, said the 5th resistance and said second electric capacity are parallel with one another, and the one of which common port is connected in the emitter of first triode in the said oscillatory circuit.
Preferably, the positive pole of said first polar capacitor is connected in the emitter of the 4th triode in the said push-pull circuit.
Preferably, said first triode, second triode, the 3rd triode and the 4th triode are the NPN triode, and said the 5th triode is the PNP triode.
Preferably, the voltage of said first voltage input end is+5V that the voltage of said second voltage input end is+12V that the voltage of said tertiary voltage input end is-24V.
Preferably, the voltage stabilizing value of said voltage stabilizing diode is 6.2V.
The VFD filament voltage that the utility model proposes produces circuit; Adopt the purpose of the combination realization generation VFD filament voltage of gadgets such as resistance, electric capacity and triode; Replaced in the prior art mode that produces the VFD filament voltage through transformer; Make the utility model not only omit the design of Transformer Winding, winding displacement etc.; Effectively reduce the design cost of VFD filament voltage generation circuit, also reduced the area of the shared pcb board of VFD filament voltage generation circuit, the utility model can also be adjusted the size of VFD filament voltage neatly simultaneously.
Description of drawings
Fig. 1 is the schematic block circuit diagram that the utility model VFD filament voltage produces the circuit preferred embodiment;
Fig. 2 is the electrical block diagram that the utility model VFD filament voltage produces the circuit preferred embodiment.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
With reference to Fig. 1; Fig. 1 is the schematic block circuit diagram that the utility model VFD filament voltage produces the circuit preferred embodiment, comprises first voltage input end 1, second voltage input end 2, tertiary voltage input end 3, oscillatory circuit 4, push-pull circuit 5, the adjustment of VFD filament voltage circuit 6, first voltage output end 7 and second voltage output end 8.
Wherein, First voltage input end 1 is connected with oscillatory circuit 4, and second voltage input end 2 is connected with push-pull circuit 5, and tertiary voltage input end 3 is connected with VFD filament voltage adjustment circuit 6; The voltage of 4 pairs first voltage input ends 1 of oscillatory circuit carries out oscillation treatment; Output first party wave voltage, and the first party wave voltage that 5 pairs of oscillatory circuits 4 of push-pull circuit are exported carries out processing and amplifying, output second party wave voltage; The magnitude of voltage of the second party wave voltage that 6 pairs of push-pull circuits 5 of VFD filament voltage adjustment circuit are exported is adjusted, and is defeated by the two ends of VFD filament afterwards through first voltage output end 7 and second voltage output end 8.
The voltage of first voltage input end 1 is+5V in the utility model preferred embodiment, and the voltage of second voltage input end 2 is+12V that the voltage of tertiary voltage input end 3 is-24V.Wherein, the voltage of first voltage input end 1 can be shared with the supply voltage of the drive IC of VFD, provided through simple mu balanced circuit by the voltage of+12V.
With reference to Fig. 2, Fig. 2 is the electrical block diagram that the utility model VFD filament voltage produces the circuit preferred embodiment, comprises oscillatory circuit 4, push-pull circuit 5 and VFD filament voltage adjustment circuit 6; Among the figure+5V is first input voltage; + 12V is second input voltage, and-24V is the 3rd input voltage, and AC1 is first voltage output end; AC2 is second voltage output end, the first voltage output end AC1 and be that the second voltage output end AC2 is connected with the two ends of VFD filament respectively.
Wherein, oscillatory circuit 4 comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first triode Q1, the second triode Q2 and first capacitor C 1.Wherein, the first triode Q1 and the second triode Q2 are the NPN triode.
Concrete; One end of first resistance R 1 is connected with first input voltage of+5V; The other end of first resistance R 1 is connected with the base stage of the first triode Q1 and the collector of the second triode Q2 respectively; The collector of the first triode Q1 is connected with first input voltage of+5V; Base stage warp second resistance R 2 of the second triode Q2 is connected with the emitter of the first triode Q1, warp first capacitor C 1 ground connection, and emitter warp the 3rd resistance R 3 of the second triode Q2 is connected with the emitter of the first triode Q1, warp the 4th resistance R 4 ground connection.
Among the utility model embodiment, the resistance of first resistance R 1, second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 is respectively 10K, 18K, 1K, 1K, and the electric capacity of first capacitor C 1 is 1000p.
First input voltage of+5V makes the first triode Q1 conducting through first resistance R 1; Charge through 2 pairs first capacitor C 1 of second resistance R after the first triode Q1 conducting, when first capacitor C 1 is charged to the base stage B that makes the second triode Q2 and the voltage V between its emitter E
BeDuring greater than 0.7V, the second triode Q2 conducting, the first triode Q1 ends.First capacitor C 1 discharges into the base stage B that makes the second triode Q2 and the voltage V between its emitter E through R2
BeDuring less than 0.7V, the second triode Q2 ends, the first triode Q1 conducting, and so loop cycle is exported the first party wave voltage about a 40khz in the emitter E of the first triode Q1.The capacitance that the utility model embodiment can be through regulating first capacitor C 1 and the resistance value of second resistance R 2 just can change the frequency of the first party wave voltage that oscillatory circuit 4 exported.
Push-pull circuit 5 comprises the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5 and second capacitor C 2.Wherein, the 3rd triode Q3 and the 4th triode Q4 are the NPN triode, and the 5th triode Q5 is the PNP triode.
Concrete; The 5th resistance R 5 and second capacitor C 2 are parallel with one another; The emitter of the first triode Q1 in one of which common port and the oscillatory circuit 4 is connected; Another common port is connected with the base stage of the 3rd triode Q3 and through the 6th resistance R 6 ground connection, the collector of the 3rd triode Q3 is connected with the base stage of the 4th triode Q4 and the base stage of the 5th triode Q5 respectively, and the collector of the 3rd triode Q3 also warp the 7th resistance R 7 and the 8th resistance R 8 is connected with second input voltage of+12V; The grounded emitter of the 3rd triode Q3; The collector of the 4th triode Q4 is connected with second input voltage of+12V, and the emitter of the 4th triode Q4 is connected with the emitter of the 5th triode Q5, the grounded collector of the 5th triode Q5.
Among the utility model embodiment, the resistance of the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8 is respectively 4.7K, 10K, 0.47K, 0.47K, and the electric capacity of second capacitor C 2 is 0.1u.
The first party wave voltage that is produced by oscillatory circuit 4 inputs to the base stage B of the 3rd triode Q3 through second capacitor C 2, the 5th resistance R 5.During the positive half cycle of first party wave voltage, the 3rd triode Q3 conducting, the 5th triode Q5 conducting, the 4th triode Q4 ends; Otherwise during the negative half period of first party wave voltage, the 3rd triode Q3 ends, and the 5th triode Q5 ends, the 4th triode Q4 conducting.Therefore at the second party wave voltage of the enhancing of emitter E output of the 4th triode Q4, promptly the first party wave voltage exported of 5 pairs of oscillatory circuits 4 of push-pull circuit has carried out processing and amplifying.
VFD filament voltage adjustment circuit comprises the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R 13, the first polar capacitor CE1, the second polar capacitor CE2 and voltage stabilizing diode ZD.
Concrete, the emitter of the 4th triode Q4 in the positive pole of the first polar capacitor CE1 and the push-pull circuit 5 is connected, and the negative pole of first polar capacitor CE1 warp the 13 resistance R 13 respectively is connected with the second voltage output end AC2; And be connected with the first voltage output end AC1 through the 9th resistance R 9, the tenth resistance R 10 and the 12 resistance R 12; The end of voltage stabilizing diode ZD is connected between the 9th resistance R 9 and the tenth resistance R 10; The other end is connected with the 3rd input voltage of-24V; One end of the 11 resistance R 11 is connected between the 9th resistance R 9 and the tenth resistance R 10; Other end ground connection, the negative pole of the second polar capacitor CE2 are connected between the tenth resistance R 10 and the 12 resistance R 12, the plus earth of the second polar capacitor CE2.
Among the utility model embodiment; Wherein the resistance of the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R 12, the 13 resistance R 13 is respectively 0.47K, 0.33K, 10K, 0.012K, 0.012K; The electric capacity of the first polar capacitor CE1 and the second polar capacitor CE2 is 3.3uF/50v, and the voltage stabilizing value of voltage stabilizing diode ZD is 6.2V.
First capacitor C 1 among Fig. 2, second resistance R 2, the first polar capacitor CE1, the second polar capacitor CE2, the 12 resistance R the 12, the 13 resistance R 13 are the key parameter of the utility model; The utility model embodiment can be through adjusting the oscillation frequency that first capacitor C 1 and second resistance R 2 change the first party wave voltage that oscillatory circuit exports; Through adjusting the size that the first polar capacitor CE1, the second polar capacitor CE2, the 12 resistance R the 12, the 13 resistance R 13 change VFD filament voltage adjustment circuit institute output voltage, promptly change the size of VFD filament voltage.
The beneficial effect of the utility model is: the utility model VFD filament voltage produces circuit and can design on same pcb board with VFD; The winding displacement between the pcb board connects in the prior art thereby simplified; Also reduce the area of the shared pcb board of VFD filament voltage generation circuit, reduced the cost of product; And the utility model can come the size of adjustment VFD filament voltage flexibly through the size of adjustment corresponding resistor and electric capacity; Compare the mode of adjusting VFD filament voltage size through the line footpath and the number of turns of adjustment Transformer Winding in the prior art, quick more reaching effectively; Simultaneously, can also the utility model VFD filament voltage be produced circuit and be integrated into the VFD the inside, with the cost of further reduction product.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (10)
1. a VFD filament voltage produces circuit; It is characterized in that; Comprise first voltage input end, oscillatory circuit, push-pull circuit, the adjustment of VFD filament voltage circuit, first voltage output end and second voltage output end; Said first voltage input end is connected with said oscillatory circuit, and said oscillatory circuit carries out oscillation treatment to the voltage of said first voltage input end, output first party wave voltage; Said push-pull circuit carries out processing and amplifying to said first party wave voltage; Output second party wave voltage, said VFD filament voltage adjustment circuit is adjusted the magnitude of voltage of said second party wave voltage, is defeated by the two ends of VFD filament through said first voltage output end and second voltage output end.
2. VFD filament voltage according to claim 1 produces circuit; It is characterized in that; Said VFD filament voltage produces circuit and also comprises second voltage input end and tertiary voltage input end; Said second voltage input end is connected with said push-pull circuit, and said tertiary voltage input end is connected with said VFD filament voltage adjustment circuit.
3. VFD filament voltage according to claim 1 produces circuit; It is characterized in that; Said oscillatory circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, first triode, second triode and first electric capacity; One end of said first resistance is connected with said first input voltage; The other end is connected with the base stage of said first triode and the collector of said second triode respectively; The collector of said first triode is connected with said first input voltage, the base stage of said second triode through said second resistance be connected with the emitter of said first triode, through said first capacity earth, the emitter of said second triode through said the 3rd resistance be connected with the emitter of said first triode, through said the 4th resistance eutral grounding.
4. VFD filament voltage according to claim 1 produces circuit; It is characterized in that; Said push-pull circuit comprises the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 3rd triode, the 4th triode, the 5th triode and second electric capacity; Said the 5th resistance and said second electric capacity are parallel with one another, and the one of which common port is connected with said oscillatory circuit, and another common port is connected with the base stage of said the 3rd triode and through said the 6th resistance eutral grounding; The collector of said the 3rd triode is connected with the base stage of said the 4th triode and the base stage of the 5th triode respectively; The collector of said the 3rd triode also is connected with said second input voltage through the 7th resistance and the 8th resistance, the grounded emitter of said the 3rd triode, and the collector of said the 4th triode is connected with said second input voltage; The emitter of said the 4th triode is connected with the emitter of said the 5th triode, the grounded collector of said the 5th triode.
5. VFD filament voltage according to claim 1 produces circuit; It is characterized in that; Said VFD filament voltage adjustment circuit comprises the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, first polar capacitor, second polar capacitor and voltage stabilizing diode; The positive pole of said first polar capacitor is connected with said push-pull circuit; The negative pole of said first polar capacitor is connected with said second voltage output end and is connected with said first voltage output end through said the 9th resistance, the tenth resistance and the 12 resistance through said the 13 resistance respectively, and an end of said voltage stabilizing diode is connected between said the 9th resistance and said the tenth resistance, and the other end is connected with said the 3rd input voltage; One end of said the 11 resistance is connected between said the 9th resistance and said the tenth resistance; Other end ground connection, the negative pole of said second polar capacitor are connected between said the tenth resistance and said the 12 resistance, the plus earth of said second polar capacitor.
6. produce circuit according to claim 3 or 4 described VFD filament voltages, it is characterized in that said the 5th resistance and said second electric capacity are parallel with one another, the one of which common port is connected in the emitter of first triode in the said oscillatory circuit.
7. produce circuit according to claim 4 or 5 described VFD filament voltages, it is characterized in that the positive pole of said first polar capacitor is connected in the emitter of the 4th triode in the said push-pull circuit.
8. produce circuit according to claim 3 or 4 described VFD filament voltages, it is characterized in that said first triode, second triode, the 3rd triode and the 4th triode are the NPN triode, said the 5th triode is the PNP triode.
9. VFD filament voltage according to claim 1 produces circuit, it is characterized in that the voltage of said first voltage input end is+5V that the voltage of said second voltage input end is+12V that the voltage of said tertiary voltage input end is-24V.
10. VFD filament voltage according to claim 5 produces circuit, it is characterized in that the voltage stabilizing value of said voltage stabilizing diode is 6.2V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120521540.6U CN202584682U (en) | 2011-12-13 | 2011-12-13 | VFD filament voltage generation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120521540.6U CN202584682U (en) | 2011-12-13 | 2011-12-13 | VFD filament voltage generation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202584682U true CN202584682U (en) | 2012-12-05 |
Family
ID=47254070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120521540.6U Expired - Lifetime CN202584682U (en) | 2011-12-13 | 2011-12-13 | VFD filament voltage generation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202584682U (en) |
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 |
-
2011
- 2011-12-13 CN CN201120521540.6U patent/CN202584682U/en not_active Expired - Lifetime
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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103326458B (en) | A kind of external power source and battery powered power supply switch circuit | |
| CN202513817U (en) | High-frequency energy conveying system used for solid compound reactive equipment switching switch | |
| CN202584682U (en) | VFD filament voltage generation circuit | |
| KR102215378B1 (en) | Protection circuit and LED driving circuit | |
| CN104916492A (en) | Relay control circuit | |
| CN209593296U (en) | A kind of pressure stabilizing rectification circuit of Novel outdoor LED display | |
| CN205173019U (en) | Centralized double-fan control system | |
| CN202068550U (en) | Mute control circuit for power failure | |
| CN103490387B (en) | A kind of single-stage PFC fly-back power source input under-voltage protection circuit | |
| CN103036436B (en) | Switching power supply parallel control circuit and method of switching power supply parallel control | |
| CN202652057U (en) | Supply circuit for quick start of integrated circuit | |
| CN204992542U (en) | Dead type overvoltage crowbar of lock | |
| CN104811173B (en) | Simple driving circuit with load short circuits protection and self-recovering function | |
| CN202495882U (en) | Power supply circuit and television | |
| CN102098011B (en) | Circuit for rapidly controlling mute of audio power amplifier | |
| CN105047477A (en) | Relay energy-saving control circuit | |
| CN201467324U (en) | Low power consumption CPU standby commutation circuit | |
| CN202976774U (en) | Boost circuit driving vacuum fluorescent display | |
| CN215498730U (en) | Passive voltage doubling circuit of DC power supply | |
| CN203775024U (en) | Power factor control system of power supply and power supply | |
| CN204993059U (en) | Constant voltage power supply's output current control output voltage's circuit | |
| CN204157003U (en) | Top box of digital machine front control board VFD shows power supply circuits | |
| CN204290767U (en) | A kind of easy Type of Switch Stabilivolt Source Circuit | |
| CN204598443U (en) | A kind of input undervoltage of electric ballast and overvoltage crowbar | |
| CN201402964Y (en) | Controller power supply low-voltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |