CN207074953U - A kind of soft switch back excitation type converter - Google Patents
A kind of soft switch back excitation type converter Download PDFInfo
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- CN207074953U CN207074953U CN201720851117.XU CN201720851117U CN207074953U CN 207074953 U CN207074953 U CN 207074953U CN 201720851117 U CN201720851117 U CN 201720851117U CN 207074953 U CN207074953 U CN 207074953U
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Abstract
A kind of soft switch back excitation type converter, including transformer, input circuit and output circuit；Input circuit includes the power input and controlling switch of series connection access armature winding；Also include the first diode, the second diode, resistance and electric capacity；Electric capacity, the first diode and resistance are sequentially connected in series, and the negative electrode and capacitance connection of the first diode；Second diodes in parallel accesses the first diode and resistance, and the anode of the second diode is connected with the negative electrode of the first diode；The Same Name of Ends of armature winding and the positive pole of power input connect.The utility model provides a kind of soft switch back exciting formula switching power converters of secondary control, enable its switching tube soft switching, secondary commutation pipe can be soft open-minded, switching loss reduces, efficiency improves, cause switching tube both ends because due to voltage spikes caused by transformer leakage inductance is inhibited simultaneously so that inverse-excitation type switch power-supply converter EMI characteristic is optimized.
Description
Technical field
The technical field of inverse excitation type converter is the utility model is related to, more particularly to a kind of soft switch back of secondary control
Excitation type converter.
Background technology
Flyback transformer, or converter, converter, because its output end obtains energy in primary side winding deenergization
So gaining the name, when the primary coil of transformer is just encouraged by DC pulse voltage, the secondary coil of transformer is not to negative
Carry and power output is provided, and just power output is provided to load only after the driving voltage of transformer is turned off.
Traditional inverse excitation type converter is widely used in the Switching Power Supply of middle low-power, and development trend is high frequency small
Change, high power density, high efficiency, low cost.The power switch of traditional inverse excitation type converter is hard switching, and switching loss is big, effect
Rate is low, can only low-frequency operation, it is impossible to meets that energy-conservation, miniaturization etc. require；Leakage inductance be present in the transformer of traditional inverse excitation type converter,
When switching tube turns off, at a relatively high peak voltage occurs in the voltage at switching tube both ends, cause power switch damage and
The problem of bringing EMI bad；The secondary commutation diode of traditional inverse excitation type converter is also to open and turn off firmly firmly, loss ratio compared with
Greatly, while the high peak voltage of comparison also occurs in diode both ends, causes the damage of power switch and brings EMI bad
Problem.
At present, in order to improve the efficiency of inverse excitation type converter and reduce the voltage stress of switching device, more using Sofe Switch
Quasi-resonance control technology and Sofe Switch active-clamp technology.In the supply convertor that the quasi-resonance of Sofe Switch controls,
Power switch pipe turns in the trough bottom of the resonance potential ripple at its parasitic capacitance both ends, can reduce part turn-on consumption, but open
It is to turn off firmly to close pipe, and loss is bigger, and particularly when switching frequency improves, turn-off power loss will be bigger；In the active of Sofe Switch
In the supply convertor for clamping control, switching tube is opened during anti-paralleled diode afterflow by controlling active-clamp switching tube
So as to realize that no-voltage is opened while realizes the absorption of peak voltage caused by leakage inductance, but active-clamp control technology still can not
It is soft switching to realize switching tube, can only reduce the loss of the absorbing circuit of peak voltage, and active-clamp control circuit is complicated,
Limit promoting the use of for technique.
Utility model content
Goal of the invention of the present utility model is to provide a kind of soft switch back excitation type converter of secondary control, using this reality
The switch for solving existing inverse excitation type converter with the technical scheme of new offer is not zero voltage turn-off, thus switching loss ratio
It is larger, the problem of efficiency is low；Because due to voltage spikes damages switching tube caused by transformer leakage inductance the problem of and the EMI that brings is bad
The problem of；Secondary commutation diode loss caused by opening and turning off firmly firmly, due to voltage spikes and EMI bad characteristics are asked
Topic.
In order to solve the above-mentioned technical problem, technical scheme is used by the utility model：A kind of soft switch back exciting formula becomes
Parallel operation, including the input circuit of the armature winding of transformer, the access transformer and the secondary of the access transformer around
The output circuit of group；The input circuit includes the power input and controlling switch that series connection accesses the armature winding；It is described
Output circuit includes the power output end and filter circuit for accessing the secondary windings；Also include protection circuit；The protection electricity
Road includes the first diode, the second diode, resistance and electric capacity；The electric capacity, the first diode and resistance are sequentially connected in series, and institute
State the negative electrode of the first diode and the capacitance connection；Second diodes in parallel accesses first diode and resistance,
And the anode of second diode is connected with the negative electrode of first diode；The Same Name of Ends of the armature winding and power supply are defeated
Enter the positive pole connection at end；The protection circuit is in parallel to access the secondary windings, the negative electrode of second diode with described time
The Same Name of Ends connection of level winding, the electric capacity are connected with the different name end of the secondary windings.
Preferably, the protection circuit also includes inductance；First diode, resistance and the inductance are sequentially connected in series, and with
Second diodes in parallel.
Preferably, the controlling switch is switching tube, and the switching tube series connection accesses the armature winding of the transformer.
Preferably, the filter circuit includes polar capacitor and secondary commutation pipe；Described in polar capacitor access in parallel
Power output end, and the positive pole of the polar capacitor is connected with the positive pole of the power output end；The sun of the secondary commutation pipe
Pole is connected with the negative pole of the power output end, and negative electrode is connected with the negative electrode of second diode.
Therefore the technical scheme provided using the utility model embodiment can reach following beneficial effect：This reality
With the soft switch back excitation type converter of new offer, controlled using Sofe Switch, switching loss is small, efficiency high, can high frequency operation,
The problems such as also meeting energy-conservation, miniaturization；Because capacitance is bigger, controlling switch both end voltage from zero to positive increase ratio compared with
Slowly so that controlling switch both ends solve existing flyback switching because due to voltage spikes caused by transformer leakage inductance is inhibited
The secondary commutation diode of supply convertor loss, due to voltage spikes and EMI bad characteristics caused by hard open with shut-off firmly
The problem of.
Brief description of the drawings
, below will be to this practicality in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in the description of new embodiment or prior art.It should be evident that description below
In accompanying drawing be only part of the embodiment of the present utility model, for those of ordinary skill in the art, do not paying wound
On the premise of the property made is laborious, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of the utility model embodiment 1；
Fig. 2 is the circuit diagram of the utility model embodiment 2.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe.Obviously, described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Embodiment 1
Because the switch of existing inverse excitation type converter is not zero voltage turn-off, thus switching loss is bigger, and efficiency is low
Problem；Because due to voltage spikes damages switching tube caused by transformer leakage inductance the problem of and the problem of the EMI that brings is bad；It is secondary whole
Stream diode is opened and is lost caused by turning off firmly, due to voltage spikes and the problem of EMI bad characteristics because hard.
Fig. 1 is referred to, the present embodiment provides a kind of soft switch back excitation type converter, including at least transformer 4, input circuit
And output circuit.Wherein transformer 4 comprises at least armature winding 5 and secondary windings 6, and input circuit access armature winding 5 is defeated
Go out circuit access secondary windings 6.
Input circuit includes the power input and controlling switch of series connection access armature winding 5, wherein power input bag
Power input anode 1 and power input negative terminal 2 are included, controlling switch can be switching tube 3.Power input anode 1 and transformer 4
Armature winding 5 and switching tube 3 and power input negative terminal 2 are sequentially connected in series, Same Name of Ends and the power input anode 1 of armature winding 5
It is connected.
Output circuit then includes the power output end and filter circuit of access secondary windings 6, and wherein power output end includes
Power supply output plus terminal 14 and the power supply output negative terminal 15 being connected with the Same Name of Ends of secondary windings 6, filter circuit can be used in filtering off
Ripple in rectifier output voltage, including secondary commutation pipe 12 and polar capacitor 13.The wherein access power supply in parallel of polar capacitor 13
Output end, the positive pole of polar capacitor 13 are connected with power supply output plus terminal 14, negative pole and the power supply output negative terminal 14 of polar capacitor 13
Connection.The anode of secondary commutation pipe 12 is connected with power supply output negative terminal 14, and Same Name of Ends of the negative electrode then with secondary windings 6 is connected.
In order to solve the above-mentioned technical problem, the soft switch back excitation type converter that the present embodiment provides also includes protection circuit,
The protection circuit includes the first diode 8, the second diode 11, resistance 9 and electric capacity 7.
Electric capacity 7, the first diode 8 and resistance 9 are sequentially connected in series, and the negative electrode of the first diode 8 is connected with electric capacity 7.Second
First diode 8 of access in parallel of diode 11 and resistance 9, and the negative electrode of the anode of the second diode 11 and the first diode 8 connects
Connect.The Same Name of Ends of armature winding 5 is connected with power input anode 1.Protection circuit access secondary windings 6 in parallel, specifically, second
The negative electrode of diode 11 is connected with the Same Name of Ends of secondary windings 6, and electric capacity 7 is connected with the different name end of secondary windings 6.
A kind of soft switch back excitation type converter of secondary control as described above, when the switching tube 3 of its primary side turns on,
The induced potential of the secondary windings 6 of transformer 4 is Same Name of Ends for just, this induced potential turns on the first diode 8, through resistance
9th, the first diode 8 charges to electric capacity 7, and resistance 9 limits the charging current to electric capacity 7.When switching tube 3 turns off, transformer 4
The induced potential of secondary windings 6 starts reversely to be changed into different name end as just, now the voltage of electric capacity 7 is relative to the different of secondary windings 6
Name end is just, and the magnitude of voltage of electric capacity 7 is reduced by positive zero resonance, and the first diode 8 continues to turn on, when the sense of secondary windings 6
When raw voltage is risen to relative to power supply output negative terminal more than 15, the first diode 8 ends, and the second diode 11 turns on, secondary
The induced potential of winding 6 charges through the second diode 11 to electric capacity 7, the magnitude of voltage of electric capacity 7 relative to secondary windings 6 different name end
To be increased from zero to negative resonance, when the magnitude of voltage of electric capacity 7 increases to output voltage to be exceeded, secondary commutation pipe 12 is naturally soft to lead
Logical, loss during conducting is small, due to voltage spikes is small, and the magnitude of voltage of electric capacity 7 no longer increases, and the quantity of magnetism of secondary windings 6 exports to power supply
Release.Because the mutual inductance of transformer 4 acts on, when the induced potential of secondary windings 6 is just slowly risen by negative sense, at the beginning of transformer 4
The induced potential of level winding 5 can also rise from zero to just slow so that switching tube both end voltage during the electric current vanishing of switching tube
Still than relatively low, thus, switching tube 3 can soft switching, because the capacity of electric capacity 7 is bigger, switching tube both end voltage is from zero on just
Rise slower so that switching tube both ends reach because due to voltage spikes caused by transformer leakage inductance is inhibited and solve existing flyback
The problem of formula switching power converters.
Embodiment 2
A kind of soft switch back excitation type converter is present embodiments provided, including at least transformer 4, input circuit and output
Circuit.Output circuit then includes the power output end and filter circuit of access secondary windings 6, and wherein power output end includes power supply
Output plus terminal 14 and the power supply output negative terminal 15 being connected with the Same Name of Ends of secondary windings 6, filter circuit can be used in filtering off rectification
Ripple in output voltage, including secondary commutation pipe 12 and polar capacitor 13.The wherein access power supply output in parallel of polar capacitor 13
End, the positive pole of polar capacitor 13 are connected with power supply output plus terminal 14, and the negative pole of polar capacitor 13 is connected with power supply output negative terminal 14.
The anode of secondary commutation pipe 12 is connected with power supply output negative terminal 14, and Same Name of Ends of the negative electrode then with secondary windings 6 is connected.
Equally also include protection circuit, the protection circuit includes the first diode 8, the second diode 11, resistance 9 and electric capacity
7.Electric capacity 7, the first diode 8 and resistance 9 are sequentially connected in series, and the negative electrode of the first diode 8 is connected with electric capacity 7.Second diode
11 first diodes 8 of access in parallel and resistance 9, and the anode of the second diode 11 is connected with the negative electrode of the first diode 8.It is primary
The Same Name of Ends of winding 5 is connected with power input anode 1.Protection circuit access secondary windings 6 in parallel, specifically, the second diode
11 negative electrode is connected with the Same Name of Ends of secondary windings 6, and electric capacity 7 is connected with the different name end of secondary windings 6.
Refer to Fig. 2, as the further improvement of technical scheme, the present embodiment as different from Example 1, protection circuit
Also include inductance 10；First diode 8, resistance 9 and inductance 10 are sequentially connected in series, and in parallel with the second diode 11.
The soft switch back excitation type converter that the present embodiment provides, the work in its embodiment and embodiment 1 are former
Reason is consistent, no longer herein to state more.Compared to embodiment 1, embodiment adds inductance 10, when the primary side of transformer 4 is opened
When closing pipe 3 and turning on, the induced potential of the secondary windings 6 of transformer 4 is through the first inductance 10, resistance 9, the first diode 8 to electric capacity 7
Charging, the first inductance 10 and resistance 9 limit the charging current to electric capacity 7 so that the electrical loss of the soft switch back excitation type converter
It can decrease.
Embodiments described above, the restriction to the technical scheme protection domain is not formed.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (4)
1. a kind of soft switch back excitation type converter, including the input circuit of the armature winding of transformer, the access transformer with
And the output circuit of the secondary windings of the access transformer；The input circuit includes the electricity that series connection accesses the armature winding
Source input and controlling switch；The output circuit includes the power output end and filter circuit for accessing the secondary windings；Its
It is characterised by：
Also include protection circuit；The protection circuit includes the first diode, the second diode, resistance and electric capacity；The electric capacity,
First diode and resistance are sequentially connected in series, and the negative electrode of first diode and the capacitance connection；Second diode
Parallel connection accesses first diode and resistance, and the negative electrode of the anode of second diode and first diode connects
Connect；The Same Name of Ends of the armature winding and the positive pole of power input connect；Protection circuit access in parallel it is described it is secondary around
Group, the negative electrode of second diode are connected with the Same Name of Ends of the secondary windings, and the electric capacity is different with the secondary windings
The connection of name end.
A kind of 2. soft switch back excitation type converter according to claim 1, it is characterised in that：The protection circuit also includes
Inductance；First diode, resistance and the inductance are sequentially connected in series, and with second diodes in parallel.
A kind of 3. soft switch back excitation type converter according to claim 1 or 2, it is characterised in that：The controlling switch is
Switching tube, the switching tube series connection access the armature winding of the transformer.
A kind of 4. soft switch back excitation type converter according to claim 3, it is characterised in that：The filter circuit includes pole
Property electric capacity and secondary commutation pipe；The polar capacitor is in parallel to access the power output end, and the positive pole of the polar capacitor with
The positive pole connection of the power output end；The anode of the secondary commutation pipe is connected with the negative pole of the power output end, negative electrode
It is connected with the negative electrode of second diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720851117.XU CN207074953U (en) | 2017-07-13 | 2017-07-13 | A kind of soft switch back excitation type converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720851117.XU CN207074953U (en) | 2017-07-13 | 2017-07-13 | A kind of soft switch back excitation type converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207074953U true CN207074953U (en) | 2018-03-06 |
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ID=61522244
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720851117.XU Active CN207074953U (en) | 2017-07-13 | 2017-07-13 | A kind of soft switch back excitation type converter |
Country Status (1)
| Country | Link |
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| CN (1) | CN207074953U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107248812A (en) * | 2017-07-13 | 2017-10-13 | 天宝电子（惠州）有限公司 | A kind of soft switch back excitation type converter |
| CN110661418A (en) * | 2019-10-21 | 2020-01-07 | 科华恒盛股份有限公司 | Buck circuit based on soft switch |
-
2017
- 2017-07-13 CN CN201720851117.XU patent/CN207074953U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107248812A (en) * | 2017-07-13 | 2017-10-13 | 天宝电子（惠州）有限公司 | A kind of soft switch back excitation type converter |
| CN110661418A (en) * | 2019-10-21 | 2020-01-07 | 科华恒盛股份有限公司 | Buck circuit based on soft switch |
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