CN207853738U - Flyback overcurrent protection power supply - Google Patents
Flyback overcurrent protection power supply Download PDFInfo
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- CN207853738U CN207853738U CN201820165824.8U CN201820165824U CN207853738U CN 207853738 U CN207853738 U CN 207853738U CN 201820165824 U CN201820165824 U CN 201820165824U CN 207853738 U CN207853738 U CN 207853738U
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Abstract
The utility model discloses a kind of flyback overcurrent protection power supplys; it includes fuse, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first diode, the second diode, the first capacitance, the second capacitance, third capacitance, third field-effect tube, the 4th field-effect tube, transformer etc.; fuse is connected with the first capacitance; first capacitance is connected with first resistor; first capacitance and the second capacitance, 3rd resistor, the 4th capacitance, the second diodes in parallel; third capacitance is connected with the second capacitance, the 4th diode and the second Diode series etc..The utility model circuit is simple, keeps electric current smooth, repeatedly filters, and eliminates interference.
Description
Technical field
The utility model is related to a kind of power supplys, more particularly to a kind of flyback overcurrent protection power supply.
Background technology
In the related application of electronic circuit, its essential part of power supply room, the quality and performance of power supply directly determine
The quality of entire electronic equipment, many places all be unable to do without electronic products, conventional power source conversion effect in our market lives
Rate is low, and output voltage is unstable, and electric current out-of-flatness has interference, generates harmful effect to electronic equipment, shortens electronic product
Service life increases cost.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of flyback overcurrent protection power supplys, and circuit is simple, makes
Electric current is smooth, repeatedly filters, and eliminates interference.
The utility model is to solve above-mentioned technical problem by following technical proposals：A kind of flyback overcurrent protection electricity
Source, which is characterized in that it includes fuse, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th
Resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, thirteenth resistor,
14 resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance, the first diode,
Two diodes, third diode, the 4th diode, the 5th diode, the 6th diode, the 7th diode, the 8th diode,
Nine diodes, the tenth diode, the 11st diode, the 12nd diode, the first capacitance, the second capacitance, third capacitance, the 4th
Capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance, the 9th capacitance, the tenth capacitance, the first triode, the two or three
Pole pipe, third field-effect tube, the 4th field-effect tube, transformer, fuse are connected with the first capacitance, the first capacitance and first resistor
It is connected, the first capacitance and the second capacitance, 3rd resistor, the 4th capacitance, the second diodes in parallel, third capacitance and the second capacitance string
Connection, the 4th diode and the second Diode series, the first diode and the second diodes in parallel and third diode and the two or two
Pole pipe is connected, the 5th capacitance and third Diode series, and the 4th resistance is in parallel with the 5th capacitance, the 6th capacitance and the 5th capacitance string
Connection, the 5th resistance connects with the 4th resistance, and the 4th resistance is connected with the 4th field-effect tube source electrode, the 4th fet gate and the
Eight resistance are connected, and the drain electrode of the 4th field-effect tube is connected with the 5th diode, the 5th diode and the 6th Diode series, and the 8th
Resistance and the 8th Diode series, the 9th capacitance and the 8th diodes in parallel, the 7th resistance, the 6th resistance, the series connection of the 8th capacitance,
8th capacitance is connected with the 8th pin of transformer, and the 6th diode one end is connected with third field-effect tube source electrode, the 6th diode
The other end be connected with the drain electrode of third field-effect tube, thirteenth resistor is connected with third fet gate, the 7th diode
It connects with thirteenth resistor, the 7th capacitance is connected with the 7th diodes in parallel and the 7th capacitance with the 5th pin of transformer, and the tenth
One resistance, twelfth resistor are connected with the 7th capacitance, and the 14th resistance is connected with transformer third pin, transformer third pin
It is connected with the first transistor collector, the first transistor base is connected with the 19th resistance, the 18th resistance and the 19th resistance
Series connection, the first transistor emitter and the tenth diode are connected, the 11st diode, the 12nd diode and the tenth diode
Series connection, the 9th capacitance are connected with the 9th Diode series and with the second transistor collector, the second transistor base and the 16th
Resistance is connected, and the 16th resistance is connected with the 17th resistance, the tenth capacitance.
Preferably, first diode, the second diode, third diode, the 4th diode form full-wave rectification bridge.
Preferably, first capacitance is energy storage filter capacitor.
Preferably, the first resistor is NTC thermistor.
Preferably, first triode constitutes difference amplifier with second triode.
Preferably, the transformer is flyback transformer.
The positive effect of the utility model is：The utility model circuit is simple, keeps electric current smooth, repeatedly filters,
Interference is eliminated, electronic product service life is improved, reduces cost.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Specific implementation mode
The utility model preferred embodiment is provided below in conjunction with the accompanying drawings, the technical solution of the utility model is described in detail.
As shown in Figure 1, the utility model flyback overcurrent protection power supply includes fuse F1, first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14, the 15th
Resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, the 19th resistance R19, the first diode D1,
Second diode D2, third diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6, the 7th diode
D7, the 8th diode D8, the 9th diode D9, the tenth diode D10, the 11st diode D11, the 12nd diode D12,
One capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C7,
Eight capacitance C8, the 9th capacitance C9, the tenth capacitance C10, the first triode Q1, the second triode Q2, third field-effect tube Q3, the 4th
Field-effect tube Q4, transformer B1, fuse F1 are connected with the first capacitance C1, and the first capacitance C1 is connected with first resistor R1, and first
Capacitance C1 is in parallel with the second capacitance C2,3rd resistor R3, the 4th capacitance C4, the second diode D2, the electricity of third capacitance C3 and second
Hold C2 series connection, the 4th diode D4 and the second Diode series, the first diode, D1 are in parallel with the second diode D2 and the three or two
Pole pipe D3 connects with the second diode D2, and the 5th capacitance C5 connects with third diode D3, the 4th resistance R4 and the 5th capacitance C5
In parallel, the 6th capacitance C6 connects with the 5th capacitance C5, and the 5th resistance R5 connects with the 4th resistance R4, the 4th resistance R4 and the 4th
Effect pipe Q4 source electrodes are connected, and the 4th field-effect tube Q4 grids are connected with the 8th resistance R8, the drain electrode of the 4th field-effect tube Q4 and the
Five diode D5 are connected, and the 5th diode D5 connects with the 6th diode D6, and the 8th resistance R8 connects with the 8th diode D8, the
Nine capacitance C9 are in parallel with the 8th diode D8, the 7th resistance R7, the 6th resistance R6, the 8th capacitance C8 series connection, the 8th capacitance C8 with
The 8th pins of transformer B1 are connected, and the 6th one end diode D6 is connected with third field-effect tube Q3 source electrodes, the 6th diode D6's
The other end is connected with the drain electrode of third field-effect tube Q3, and thirteenth resistor R13 is connected with third fet gate Q3, and the seven or two
Pole pipe D7 connects with thirteenth resistor R13, and the 7th capacitance C7 is in parallel with the 7th diode D7 and the 7th capacitance C7 and transformer B1
5th pin is connected, and eleventh resistor R11, twelfth resistor R12 connect with the 7th capacitance C7, the 14th resistance R14 and transformation
Device B1 third pins be connected, transformer B1 thirds pin is connected with the first triode Q1 collectors, the first triode Q1 base stages and
19th resistance R19 is connected, and the 18th resistance R18 connects with the 19th resistance R19, the first triode Q1 emitters and the 12nd
Pole pipe D10, be connected, the 11st diode D11, the 12nd diode D12 connect with the tenth diode D10, the 9th capacitance C9 and
9th diode D9 connects and is connected with the second triode Q2 collectors, the second triode Q2 base stages and the 16th resistance R16 phases
Even, the 16th resistance R16 connects with the 17th resistance R17, the tenth capacitance C10.
First diode, the second diode, third diode, the 4th diode form full-wave rectification bridge, improve whole
The efficiency of device is flowed, and rectified current is made to be easy to smooth.
First capacitance is energy storage filter capacitor, and when the circuit is energized, capacitance can store electric energy, when power is off, capacitance
The electric energy of storage can be released, circuit works on.
The first resistor is NTC thermistor, and NTC thermistor is added in circuit, is equal to and starts in input circuit
Shi Tigao input impedance reduces dash current, and when system be in stable state, since NTC thermistor is generated heat, born according to it
Temperature characterisitic, impedance reduce, and to which the loss in NTC thermistor also reduces, reduce the overall losses of system.
First triode and second triode constitute difference amplifier, solve asking for null offset in circuit
Topic.
The transformer is flyback transformer, and circuit is simple, keeps electric current smooth, thus be suitble to multigroup output requirement and
High conversion efficiency when loss is small, transformer turn ratio is smaller, input voltage fluctuates within a large range, still has and relatively stablizes
Output.
Utility model works principle is as follows：Fuse is used for overcurrent protection, and power is more than the specified of fuse in circuit
When power, blown fuse protection circuit prevents circuit burnout, improves safety.First resistor is improved in circuit when starting
Input impedance, reducing rush of current reduces during the work time in ohmically loss, reduces according to its negative temperature coefficient
The overall losses of system improve power-efficient.Second capacitance, third capacitance are filter capacitor makes its electric current by alternating current shaping
Smoothly, it is convenient for the rectification of four diodes in rear, alternating current to be changed into direct current, the 6th capacitance of the 5th capacitance is changed into exchange
After direct current, electric current is filtered again, keeps electric current smooth, eliminates interference.4th resistance and the 5th resistance prevent open circuit, the
Three field-effect tube and the effect of the 4th field-effect tube are identical, contribute to amplification and as constant-current source, have input resistance height, noise
Small, low in energy consumption, dynamic range is big, be easily integrated, without secondary-breakdown phenomenon, safety operation area field width the advantages that.Eight or two pole
Pipe prevents current reflux, and the 9th resistance is not breakdown for dividing the 8th diode of protection, and the 8th capacitance is for obstructing alternating current
Effect, prevent coils in transformers electromagnetic induction generate electromagnetic field, the first triode, the second triode put power
Greatly, the ten two the ten one the tenth diode prevents current reflux, the 9th capacitance from obstructing alternating current.
In conclusion the utility model circuit is simple, keep electric current smooth, repeatedly filter, eliminate interference, improves electronic product
Service life reduces cost.
Particular embodiments described above, the technical issues of to the solution of the utility model, technical solution and advantageous effect
It has been further described, it should be understood that the foregoing is merely specific embodiment of the utility model, not
For limiting the utility model, within the spirit and principle of the utility model, any modification for being made, changes equivalent replacement
Into etc., it should be included within the scope of protection of this utility model.
Claims (6)
1. a kind of flyback overcurrent protection power supply, which is characterized in that it includes fuse, first resistor, second resistance, third electricity
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor,
Twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance,
19th resistance, the first diode, the second diode, third diode, the 4th diode, the 5th diode, the 6th diode,
7th diode, the 8th diode, the 9th diode, the tenth diode, the 11st diode, the 12nd diode, the first electricity
Appearance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance, the 9th capacitance,
Ten capacitances, the first triode, the second triode, third field-effect tube, the 4th field-effect tube, transformer, fuse and the first electricity
Hold and be connected, the first capacitance is connected with first resistor, the first capacitance and the second capacitance, 3rd resistor, the 4th capacitance, the second diode
Parallel connection, third capacitance are connected with the second capacitance, the 4th diode and the second Diode series, the first diode and the two or two pole
Pipe parallel connection and third diode and the second Diode series, the 5th capacitance and third Diode series, the 4th resistance and the 5th electricity
Hold in parallel, the 6th capacitance to connect with the 5th capacitance, the 5th resistance is connected with the 4th resistance, the 4th resistance and the 4th field-effect tube source
Extremely it is connected, the 4th fet gate is connected with the 8th resistance, and the drain electrode of the 4th field-effect tube is connected with the 5th diode, and the 5th
Diode and the 6th Diode series, the 8th resistance and the 8th Diode series, the 9th capacitance and the 8th diodes in parallel, the 7th
Resistance, the 6th resistance, the series connection of the 8th capacitance, the 8th capacitance are connected with the 8th pin of transformer, the 6th diode one end and third
Field-effect tube source electrode is connected, and the other end of the 6th diode is connected with the drain electrode of third field-effect tube, thirteenth resistor and third
Fet gate is connected, and the 7th diode is connected with thirteenth resistor, the 7th capacitance and the 7th diodes in parallel and the 7th electric
Appearance is connected with the 5th pin of transformer, and eleventh resistor, twelfth resistor are connected with the 7th capacitance, the 14th resistance and transformer
Third pin is connected, and transformer third pin is connected with the first transistor collector, the first transistor base and the 19th resistance
It is connected, the 18th resistance is connected with the 19th resistance, and the first transistor emitter is connected with the tenth diode, the 11st pole
Pipe, the 12nd diode and the tenth Diode series, the 9th capacitance and the 9th Diode series and with the second transistor collector
It is connected, the second transistor base is connected with the 16th resistance, and the 16th resistance is connected with the 17th resistance, the tenth capacitance.
2. flyback overcurrent protection power supply as described in claim 1, which is characterized in that first diode, the second diode,
Third diode, the 4th diode form full-wave rectification bridge.
3. flyback overcurrent protection power supply as described in claim 1, which is characterized in that first capacitance is energy storage filtered electrical
Hold.
4. flyback overcurrent protection power supply as described in claim 1, which is characterized in that the first resistor is NTC thermistor.
5. flyback overcurrent protection power supply as described in claim 1, which is characterized in that first triode and the described 2nd 3
Pole pipe constitutes difference amplifier.
6. flyback overcurrent protection power supply as described in claim 1, which is characterized in that the transformer is flyback transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820165824.8U CN207853738U (en) | 2018-01-31 | 2018-01-31 | Flyback overcurrent protection power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820165824.8U CN207853738U (en) | 2018-01-31 | 2018-01-31 | Flyback overcurrent protection power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207853738U true CN207853738U (en) | 2018-09-11 |
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ID=63413758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820165824.8U Active CN207853738U (en) | 2018-01-31 | 2018-01-31 | Flyback overcurrent protection power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207853738U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108134509A (en) * | 2018-01-31 | 2018-06-08 | 常州斯坦博电子科技有限公司 | Flyback overcurrent protection power supply |
-
2018
- 2018-01-31 CN CN201820165824.8U patent/CN207853738U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108134509A (en) * | 2018-01-31 | 2018-06-08 | 常州斯坦博电子科技有限公司 | Flyback overcurrent protection power supply |
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