CN102420529A - Voltage conversion circuit for forward design of auxiliary winding in flyback topology - Google Patents
Voltage conversion circuit for forward design of auxiliary winding in flyback topology Download PDFInfo
- Publication number
- CN102420529A CN102420529A CN2011104397172A CN201110439717A CN102420529A CN 102420529 A CN102420529 A CN 102420529A CN 2011104397172 A CN2011104397172 A CN 2011104397172A CN 201110439717 A CN201110439717 A CN 201110439717A CN 102420529 A CN102420529 A CN 102420529A
- Authority
- CN
- China
- Prior art keywords
- auxiliary winding
- conversion circuit
- diode
- voltage conversion
- voltage
- 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.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 108
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 35
- 230000035939 shock Effects 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000005669 field effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a voltage conversion circuit for the forward design of an auxiliary winding in flyback topology. The voltage conversion circuit comprises a transformer, a switching tube, a pulse generator, a first diode, a second diode and a load. The transformer comprises a primary winding, the auxiliary winding and a secondary winding. A voltage input end is connected with the first end of the primary winding of which the second end is connected to the drain of the switching tube. The gate of the switching tube is connected with the pulse generator. The third end of the auxiliary winding is connected with the anode of the first diode of which the cathode is connected to the pulse generator. The fifth end of the secondary winding is connected to the anode of the second diode. The load is connected between the cathode of the second diode and the sixth end of the secondary winding. The second end, a fourth end and the fifth end are corresponding ends. The output voltage of the auxiliary winding is only related to the input voltage of the primary winding, and is not influenced by the output voltage of the secondary winding, so that the pulse generator can be ensured to work stably all the time when the range of the output voltage of the secondary winding is excessively wide.
Description
Technical field
The present invention relates to voltage conversion circuit, be specifically related to a kind of anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology.
Background technology
At present; Usually all be provided with pulse width modulation (PWM) controller in the voltage conversion circuit commonly used; This PWM controller compares through feedback voltage and the reference voltage that feedback loop obtains through the output voltage of internal comparator with voltage conversion circuit, produces the pulsewidth of modulating pulse, makes reference signal play the working control effect to output voltage; Thereby make voltage conversion circuit realize stable voltage output, be electric.
The supply power mode of the PWM controller in the existing voltage conversion circuit is two kinds: a kind of is that external power supply is its power supply; This supply power mode makes that increasing new power module in the voltage conversion circuit keeps, and defines the miniaturization and the lightweight of this voltage conversion circuit and has increased unnecessary design cost and production cost.
Another kind of mode is to supply power for this PWM controller through the auxiliary winding of transformer, and shown in accompanying drawing 1, it comprises transformer T2, switching tube Q100, pulse generator U100, diode D100, diode D200, load R100, voltage input end DC2; Transformer T2 comprises elementary winding N10, auxiliary winding N30 and secondary winding N20, and elementary winding N10 comprises the first end N101 and the second end N102, and auxiliary winding N30 comprises the 3rd end N301 and the 4th end N302; Secondary winding N20 comprises five terminal N201 and the 6th end N202, and voltage input end DC2 links to each other with the first end N101, and the second end N102 is connected to the drain electrode of switching tube Q100; The grid of switching tube Q100 links to each other with pulse generator U100; Be used to receive the pulse signal that said pulse generator produces, the 3rd end N301 is connected with the anode of diode D100, and the negative electrode of diode D100 is connected to pulse generator U100; Be used to pulse generator U100 power supply; The 4th end N302 ground connection, five terminal N201 is connected in the anode of diode D200, and load R100 is connected between the negative electrode and the 6th end N202 of diode D200; Wherein, the second end N102, the 3rd end N301 and five terminal N201 are end of the same name.Its operation principle is: when pulse generator U100 is high level; Switching tube Q100 conducting, at this moment transformer T2 is equivalent to an inductance, and the electric current of elementary winding N10 increases gradually; Secondary winding N20 induces voltage; And be lower than the current potential of the 6th end N202 at the current potential of its five terminal N201, so diode N200 ends, secondary winding N20 does not have induced current.Otherwise when pulse generator U100 was low level, switching tube Q100 ended; At this moment the electric current of elementary winding N10 is reduced to zero gradually; Secondary winding N20 induces voltage, and is higher than the current potential of the 6th end N202 so diode N200 conducting at the current potential of its five terminal N201; Secondary winding N20 produces induced current, is load R100 power supply.This voltage conversion circuit is pulse generator U100 power supply through auxiliary winding N30, makes the conducting duty ratio of pulse generator U100 through control switch pipe Q100, sets up the peak current of the elementary winding N10 of transformer T2.
Between the elementary winding N10 and secondary winding N20 of this voltage conversion circuit, all adopt the method for the topological structure of inverse-excitation type between elementary winding N10 and the auxiliary winding N30, such benefit is owing to be synchronous relation between auxiliary winding N30 and the secondary winding N20; The proportional relation of the magnitude of voltage of the two and the number of turn is crossed when low at output voltage, and auxiliary winding N30 voltage also reduces; Thereby make the control circuit undertension be the protection state; But along with the requirement of power supply industry is more and more, the power supply of the wide voltage output of ask for something produces thereupon, like battery charger; Require 0-30V; Even more all want operate as normal during high voltage, if still adopt the inverse-excitation type design of auxiliary winding N30 and secondary winding N20, then control circuit voltage can change because of the variation of output voltage; More stable control signal can't be provided, so provide stable control voltage just to become essential pursuing one's goal.For example: supposition is when the output voltage V of secondary winding N20
N20During for 30V because secondary winding N20 and auxiliary winding N30 same-phase, and pulse generator U100 generally speaking the scope of required voltage be 10-20V, establish the voltage V that assists winding N30 to export pulse generator U100 to
N30Be 20V (ceiling voltage of requirement) that the relation between the voltage turn ratio of this moment is V
N20/ V
N30=(number of turn of secondary winding N20)/(number of turn of secondary winding N30)=3/2 is after the turn ratio is confirmed, if output voltage V
N20Smaller, for example during 6V, can draw V
N30=4V, the scope that at all can't satisfy pulse generator U100 required voltage is the requirement of 10-20V.By above-mentioned visible, this voltage conversion circuit may cause pulse generator U100 not work when output voltage range is wide, thereby causes the instability of output voltage.
Summary of the invention
To the deficiency of prior art, the present invention provide a kind of can be when the output of the voltage of wide region still can steady operation the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology, it comprises voltage input end, transformer, switching tube, pulse generator, first diode, second diode, load, said transformer comprises elementary winding, auxiliary winding and secondary winding; Said elementary winding comprises first end and second end, and said auxiliary winding comprises the 3rd end and the 4th end, and said secondary winding comprises five terminal and the 6th end; Voltage input end links to each other with first end, and second end is connected to the drain electrode of switching tube, and the grid of said switching tube links to each other with pulse generator; Be used to receive the pulse signal that said pulse generator produces; The 3rd end is connected with the anode of first diode, and the negative electrode of first diode is connected to pulse generator, is used to the pulse generator power supply; The 4th end ground connection; Five terminal is connected in the anode of second diode, and load is connected between the negative electrode and the 6th end of second diode, and said second end, the 4th end and five terminal are end of the same name.
Voltage conversion circuit further comprises one first electric capacity, and the positive pole of said first electric capacity links to each other with the negative electrode of second diode, and the negative pole of first electric capacity is connected to the 6th end.Said first electric capacity is electrochemical capacitor.
Voltage conversion circuit also comprises one second electric capacity, and the positive pole of said second electric capacity links to each other with the negative electrode of first diode, the minus earth of second electric capacity.Said second electric capacity is electrochemical capacitor.
Preferably, said pulse generator is a Pwm controller.
Preferably, said load is a resistance.
Preferably, said switching tube is a n channel enhancement type field effect transistor.
The anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology that the present invention set forth, compared with prior art, its beneficial effect is: the present invention instead swashs design through secondary winding and auxiliary winding; Elementary winding and the design of auxiliary winding normal shock; So, when the output voltage of secondary winding changes, can not cause the variation of the output voltage of auxiliary winding; After the input voltage of elementary winding is confirmed; The value of the output voltage of auxiliary winding just confirms that also the scope of the power supply required voltage of pulse generator is that the requirement of 10-20V can be satisfied, but the power supply operate as normal.
Description of drawings
Accompanying drawing 2 is a kind of anti-circuit theory diagrams that swash a kind of execution mode of the voltage conversion circuit of auxiliary winding normal shock design in the topology of the present invention;
Accompanying drawing 3 is a kind of application circuit schematic diagram of Fig. 2;
Accompanying drawing 4 is the another kind of application circuit schematic diagram of Fig. 2.
Embodiment
Below, in conjunction with accompanying drawing and embodiment, anti-swash in the topology voltage conversion circuit of auxiliary winding normal shock design and do and further describe, so that clearerly understand the present invention's technological thought required for protection of the present invention.
As shown in Figure 2, instead swash the voltage conversion circuit of auxiliary winding normal shock design in the topology, comprise voltage input end DC, transformer T1, switching tube Q1, pulse generator U1, the first diode D6, the second diode D7, load R8, first capacitor C 13, second capacitor C 8; Transformer T1 comprises elementary winding N1, auxiliary winding N3 and secondary winding N2, and elementary winding N1 comprises the first end N11 and the second end N12, and auxiliary winding N3 comprises the 3rd end N31 and the 4th end N32; Secondary winding N2 comprises five terminal N21 and the 6th end N22; Voltage input end DC links to each other with the first end N11, and the second end N12 is connected to the drain electrode of switching tube Q1, and the grid of switching tube Q1 links to each other with pulse generator U1; Be used to receive the pulse signal that said pulse generator produces; The 3rd end N31 is connected with the anode of the first diode D6, and the negative electrode of the first diode D6 is connected to pulse generator U1, is used to pulse generator U1 power supply; The 4th end N32 ground connection; Five terminal N21 is connected in the anode of the second diode D7, and load R8 is connected between the negative electrode and the 6th end N22 of the second diode D7, and wherein the second end N12, the 4th end N32 and five terminal N21 are end of the same name.The positive pole of first capacitor C 13 links to each other with the negative electrode of the second diode D7, and the negative pole of first capacitor C 13 is connected to the 6th end N22.The positive pole of second capacitor C 8 links to each other with the negative electrode of the first diode D6, the minus earth of second capacitor C 8.In preferred embodiment of the present invention, first electric capacity and second electric capacity are electrochemical capacitor, are respectively the voltage of delivering to load terminal voltage and delivering to pulse generator U1 and carry out filtering.Pulse generator U11 is the PWM controller, and switching tube Q1 is a n channel enhancement type field effect transistor.
This secondary winding N2 and auxiliary winding N3 instead swash (end antiphase of the same name) design; When the output voltage of secondary winding N2 changes; Can not cause the variation of the output voltage of auxiliary winding N3, can avoid because the output voltage of secondary winding N2 changes the interference that brings to auxiliary winding N3; And elementary winding N1 and auxiliary winding N3 normal shock (end same-phase of the same name) design; After the input voltage of elementary winding N1 is confirmed; Because the two the voltage and the number of turn are proportional, the value of the output voltage of auxiliary winding N3 just confirms that also auxiliary winding N3 can provide stable control voltage signal; The scope of the power supply required voltage of pulse generator U1 is that the requirement of 10-20V can be satisfied, and makes pulse generator U1 operate as normal.It is identical that the control output voltage of pulse generator U1 is stablized the mentioned principle of output principle and background technology, repeats no more here.
This scheme and design; Can be used for to provide in such circuit the burning voltage source circuit that does not receive the secondary voltage variable effect; The burning voltage that auxiliary winding N3 as shown in Figure 4 provides for comparator U2C; Can certainly also can make other various corresponding changes and distortion for U2A, U2B etc. provides stable voltage, and these all changes and distortion should belong within the protection range of claim of the present invention all.
Claims (8)
1. an anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology is characterized in that it comprises voltage input end, transformer, switching tube, pulse generator, first diode, second diode, load; Said transformer comprises elementary winding, auxiliary winding and secondary winding, and said elementary winding comprises first end and second end, and said auxiliary winding comprises the 3rd end and the 4th end; Said secondary winding comprises five terminal and the 6th end, and voltage input end links to each other with first end, and second end is connected to the drain electrode of switching tube; The grid of said switching tube links to each other with pulse generator, is used to receive the pulse signal that said pulse generator produces, and the 3rd end is connected with the anode of first diode; The negative electrode of first diode is connected to pulse generator; Be used to the pulse generator power supply, the 4th end ground connection, five terminal is connected in the anode of second diode; Load is connected between the negative electrode and the 6th end of second diode, and said second end, the 4th end and five terminal are end of the same name.
2. the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology as claimed in claim 1; It is characterized in that; Voltage conversion circuit further comprises one first electric capacity, and the positive pole of said first electric capacity links to each other with the negative electrode of second diode, and the negative pole of first electric capacity is connected to the 6th end.
3. the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology as claimed in claim 2 is characterized in that said first electric capacity is electrochemical capacitor.
4. according to claim 1 or claim 2 the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology; It is characterized in that; Voltage conversion circuit also comprises one second electric capacity, and the positive pole of said second electric capacity links to each other with the negative electrode of first diode, the minus earth of second electric capacity.
5. the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology as claimed in claim 4 is characterized in that said second electric capacity is electrochemical capacitor.
6. the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology as claimed in claim 1 is characterized in that said pulse generator is a Pwm controller.
7. the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology as claimed in claim 1 is characterized in that said load is a resistance.
8. the anti-voltage conversion circuit that swashs auxiliary winding normal shock design in the topology as claimed in claim 1 is characterized in that said switching tube is a n channel enhancement type field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104397172A CN102420529A (en) | 2011-12-23 | 2011-12-23 | Voltage conversion circuit for forward design of auxiliary winding in flyback topology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104397172A CN102420529A (en) | 2011-12-23 | 2011-12-23 | Voltage conversion circuit for forward design of auxiliary winding in flyback topology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102420529A true CN102420529A (en) | 2012-04-18 |
Family
ID=45944797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104397172A Pending CN102420529A (en) | 2011-12-23 | 2011-12-23 | Voltage conversion circuit for forward design of auxiliary winding in flyback topology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102420529A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019024134A1 (en) * | 2017-08-02 | 2019-02-07 | 深圳市华星光电技术有限公司 | Backlight driving circuit |
| CN110417270A (en) * | 2019-07-19 | 2019-11-05 | 广州金升阳科技有限公司 | A kind of simplex winding Forward- flyback auxiliary power supply circuit |
| CN119274934A (en) * | 2024-10-28 | 2025-01-07 | 东莞市睿谷创新科技有限公司 | Power supply topology structure and planar transformer with switch tube located between primary windings |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000059104A1 (en) * | 1999-03-26 | 2000-10-05 | Sarnoff Corporation | A high-efficiency soft-switching power supply |
| JP2006050760A (en) * | 2004-08-04 | 2006-02-16 | New Japan Radio Co Ltd | Switching power supply circuit and control method therefor |
| CN101212182A (en) * | 2006-12-29 | 2008-07-02 | 群康科技(深圳)有限公司 | Power circuit |
| CN202353474U (en) * | 2011-12-23 | 2012-07-25 | 崧顺电子（深圳）有限公司 | Voltage transformation circuit for normal shock design in fly-back topology |
-
2011
- 2011-12-23 CN CN2011104397172A patent/CN102420529A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000059104A1 (en) * | 1999-03-26 | 2000-10-05 | Sarnoff Corporation | A high-efficiency soft-switching power supply |
| JP2006050760A (en) * | 2004-08-04 | 2006-02-16 | New Japan Radio Co Ltd | Switching power supply circuit and control method therefor |
| CN101212182A (en) * | 2006-12-29 | 2008-07-02 | 群康科技(深圳)有限公司 | Power circuit |
| CN202353474U (en) * | 2011-12-23 | 2012-07-25 | 崧顺电子（深圳）有限公司 | Voltage transformation circuit for normal shock design in fly-back topology |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019024134A1 (en) * | 2017-08-02 | 2019-02-07 | 深圳市华星光电技术有限公司 | Backlight driving circuit |
| CN110417270A (en) * | 2019-07-19 | 2019-11-05 | 广州金升阳科技有限公司 | A kind of simplex winding Forward- flyback auxiliary power supply circuit |
| CN119274934A (en) * | 2024-10-28 | 2025-01-07 | 东莞市睿谷创新科技有限公司 | Power supply topology structure and planar transformer with switch tube located between primary windings |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102255489A (en) | High-voltage start-up circuit for switching power supply converter | |
| CN102594170A (en) | Wide-input-voltage power supply converter | |
| CN104734188A (en) | Voltage high-gain photovoltaic grid-connected inverter main circuit topology | |
| CN102711306B (en) | Impact current eliminating circuit | |
| CN104795976A (en) | Driving control circuit capable of shutting down PMOS switch tube rapidly and designing method thereof | |
| CN103825457A (en) | Quasi-Z-source DC-DC boost converter circuit | |
| CN102545552B (en) | Matching circuit and large-power pulse power supply using same | |
| CN204442176U (en) | A kind of switched inductors type accurate Z source DC-DC converter circuit | |
| CN202444406U (en) | Matching circuit and high-power pulse power supply using the same | |
| CN103368425A (en) | Synchronous rectification driving circuit | |
| CN102420529A (en) | Voltage conversion circuit for forward design of auxiliary winding in flyback topology | |
| CN202353474U (en) | Voltage transformation circuit for normal shock design in fly-back topology | |
| CN203747641U (en) | Switching power supply acceleration and consumption reduction starting circuit | |
| CN104158402A (en) | Novel boost switching power supply | |
| CN105529918A (en) | High-gain Trans-Z source boost converter | |
| CN104901378A (en) | Mobile power supply | |
| CN105186879A (en) | Bidirectional high-gain non-isolated converter and control method thereof | |
| CN204013231U (en) | A kind of boosted switch power supply | |
| CN205336112U (en) | High -gain trans -Z source booster converter | |
| CN103762852B (en) | High-efficiency high-gain DC-DC converter with double coupling inductors | |
| CN204131391U (en) | A kind of quadratic form high-gain boost converter with switching capacity and coupling inductance | |
| CN204681252U (en) | A kind of Width funtion laser drive power based on the work of SEPIC topology | |
| CN207200266U (en) | A kind of circuit for preventing power input Damage by Short Circuit | |
| CN114552945A (en) | Switching power supply and electronic equipment | |
| CN105763044A (en) | Taping inductor quasi-Z-source converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120418 |