CN205725452U - Flyback power supply changer - Google Patents
Flyback power supply changer Download PDFInfo
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- CN205725452U CN205725452U CN201620292780.6U CN201620292780U CN205725452U CN 205725452 U CN205725452 U CN 205725452U CN 201620292780 U CN201620292780 U CN 201620292780U CN 205725452 U CN205725452 U CN 205725452U
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Abstract
The utility model discloses a kind of flyback power supply changer, comprise: filter network, cable compensation device again and output power regulator, filter network output compensates level；Cable compensation device again is electrically connected at filter network, compensates repaid level again when the compensation level of input cable compensation device again is low；Output power regulator is electrically connected at the FB feedback end of flyback power supply changer, and output power regulator selects to export different peak point current comparative levels and then the output of regulation flyback power supply changer according to receiving the line voltage of FB feedback end output.
Description
Technical field
This utility model relates to a kind of flyback power supply changer, specifically, relates to a kind of possessing cable and compensate and the flyback power supply changer of output regulatory function again.
Background technology
In the power supply of charger, adapter etc is applied, load current can vary widely.When charger just charges, exporting full-load current, in the charging process of battery, output current of charger constantly reduces, and after battery is full of, output current of charger is almost nil.Owing to there is certain impedance on power output cable line, when exporting full-load current, cable can produce a bigger pressure drop, cause output voltage to decline；And when exporting electric current and being almost nil, cable pressure drop is the lowest, and output voltage can raise again.In order to compensate the change of output voltage caused due to the change of output electric current, it is generally required to increase cable in supply convertor to compensate function, make the output voltage before cable be directly proportional with output electric current change, control the output voltage holding after cable and stablize.
Simultaneously for improving response speed and the job stability of supply convertor, former limit adjusts supply convertor many employings pulse frequency modulated (PFM) control method to be operated in discontinuous mode of operation (DCM), the principle of pulse frequency modulated method is when load current reduces, and the operating frequency of supply convertor is also reducing.But using pulse frequency modulated method can produce again another problem, when load current tapers into, operating frequency is also constantly reducing, when operating frequency is low to time in audiorange, and transformator can produce audio-frequency noise.In order to suppress the appearance of audio-frequency noise, operating frequency need to be controlled be not reduced in audiorange, when exporting current reduction to operating frequency close to audiorange, supply convertor starts switch peak value current control level, make operating frequency again jump to the numerical value suitable with full-load current, thus inhibit the appearance of audio-frequency noise.
After using audio-frequency noise suppression function, general cable compensates output electric current/output voltage curve and sees Fig. 3, occurs in that the most again a new problem.Charger is in charging process, and output electric current is gradually reduced, and when dropping to below 1/N Ioutmax, output voltage can decline quickly, if the charged battery voltage used is higher, may result in the phenomenon generation that battery is not fully filled.
In some AC-DC supply convertors are applied; there is employing direct series resistance from line voltage; line under-voltage protection feature is realized by the size of electric resistance partial pressure detection line voltage; i.e. brown in/out characteristic; after line voltage is more than certain magnitude of voltage; supply convertor starts to start, and after line voltage is less than certain magnitude of voltage, supply convertor then quits work.There is problems with in these application schemes, one is series resistance sampling line voltage, needs to use high-tension resistive, causes application cost high；Two is that supply convertor quits work immediately when line overtension, and line voltage range of application is restricted.
Therefore, it is badly in need of developing a kind of flyback power supply changer overcoming drawbacks described above.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of flyback power supply changer, wherein, comprises:
Filter network, output compensates level；
Cable compensation device again, is electrically connected at described filter network, compensates described compensation level again when the described compensation level inputting described cable compensation device again is low；And
Output power regulator, being electrically connected at the FB feedback end of described flyback power supply changer, described output power regulator is according to the line voltage receiving the output of described FB feedback end thus selects export different peak point current comparative levels and then regulate the output of described flyback power supply changer.
Above-mentioned flyback power supply changer, wherein, described cable compensation device again comprises:
Buffer amplifier；
Cable compensating proportion control unit, is electrically connected at described buffer amplifier；
Converter, is electrically connected at described cable compensating proportion control unit；
Wherein, described compensation level is inputted after being amplified by buffer amplifier, to cable compensating proportion control unit, described flyback power supply changer is carried out single compensation；The most described converter receives described compensation level and obtains compensation electric current output extremely described cable compensating proportion control unit, compensates described flyback power supply changer again.
Above-mentioned flyback power supply changer, wherein, described cable compensation device more also comprises the first switch element, is electrically connected at described cable compensating proportion control unit and described converter, and described first switch element receives and according to described compensation level action.
Above-mentioned flyback power supply changer, wherein, described cable compensation device more also comprises FB feedback level, is electrically connected at described cable compensating proportion control unit.
Above-mentioned flyback power supply changer, wherein, described buffer amplifier is variable gain buffer amplifier.
Above-mentioned flyback power supply changer, wherein, described variable gain buffer amplifier includes at least two kinds of amplifications, and the two amplification is controlled by same control signal.
Above-mentioned flyback power supply changer, wherein, described output power regulator comprises:
Control level generation unit, exports the first control level and the second control level after receiving the line voltage of described flyback power supply changer；
Hysteresis control unit, is electrically connected at described control level generation unit, and described first control level, described second control level are compared by described hysteresis control unit with reference potential；
Comparative level provides unit, it is provided that at least two peak point current comparative level；
Second switch unit, being electrically connected at described hysteresis control unit and described comparative level output unit, described hysteresis control unit controls one of them of the described second switch Unit selection described at least two peak point current comparative level of output according to described first control level, described second control level after comparing with reference potential.
Above-mentioned flyback power supply changer, wherein, control level generation unit comprises:
Line voltage detection module, exports the electric current proportional to described line voltage after receiving described line voltage；
Modular converter, is electrically connected at described line voltage detection module and described hysteresis control unit, and described modular converter exports described first control level and described second control level after receiving described electric current.
Above-mentioned flyback power supply changer, wherein, when described first control level is more than described reference potential, described second switch Unit selection exports one of them of described at least two peak point current comparative level, or, when described second control level is less than described reference potential, described second switch Unit selection exports wherein another of described at least two peak point current comparative level.
Above-mentioned flyback power supply changer, wherein, selects to export the most another of described at least two peak point current comparative level after described second switch unit receives audio frequency suppression control signal.
Flyback power supply changer of the present utility model is directed to its effect of prior art and is, is realized when line voltage is more than certain magnitude of voltage, and supply convertor reduces output electric current, switches to low output power mode by flyback power supply of the present utility model；After line voltage is less than certain magnitude of voltage, supply convertor recovers normal peak value comparison method level, exits low output power mode, reenters normal output power pattern.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the cable compensation device again of this utility model flyback power supply changer；
Fig. 2 is the schematic diagram of the output power regulator of this utility model flyback power supply changer；
Fig. 3 is the schematic diagram of this utility model flyback power supply changer；
Fig. 4 is to possess cable compensation device again and do not possess the output electric current/output voltage curve chart of cable compensation device again.
Wherein, reference:
11: cable compensation device again
111: variable gain buffer amplifier
112: converter
113: cable compensating proportion control unit
114: the first switch elements
115:FB feedback level
112:FB detector
12: output power regulator
121: control level generation unit
122: hysteresis control unit
123: second switch unit
124: comparative level provides unit
Detailed description of the invention
Hereby illustrate about detailed content of the present utility model and technology, be now described further with a preferred embodiment, but be not necessarily to be construed as the restriction that this utility model is implemented.
Refer to Fig. 1-3, Fig. 1 is the schematic diagram of the cable compensation device again of this utility model flyback power supply changer, Fig. 2 is the schematic diagram of the output power regulator of this utility model flyback power supply changer, and Fig. 3 is the schematic diagram of this utility model flyback power supply changer.See Fig. 3 flyback power supply changer and generally include secondary windings and the auxiliary winding of reflection secondary windings correlation output voltage that armature winding is associated with the output voltage of changer.Changer is adjusted for former limit, generally senses output voltage by the voltage of the auxiliary winding of detection close-coupled secondary windings, adjust primary side output voltage；Similarly, when switching tube turns on, auxiliary winding also can reflect the size of line voltage, and this utility model then utilizes the size of this Characteristics Detection line voltage and realizes controlling output.As Figure 1-3, flyback power supply changer of the present utility model comprises filter network, cable compensation device 11 again and output power regulator 12；Filter network output compensates level Vcom；Cable compensation device 11 again is electrically connected at filter network, compensates compensation level Vcom again when the compensation level Vcom of input cable compensation device 11 again is low；Output power regulator 12 is electrically connected at the FB feedback end of flyback power supply changer, and output power regulator 12 selects to export different peak point current comparative levels and then the output of regulation flyback power supply changer according to receiving the line voltage of FB feedback end output.
Further, cable compensation device 11 again comprises variable gain buffer amplifier 111, converter 112, cable compensating proportion control unit the 113, first switch element 114 and FB feedback level 115；Variable gain buffer amplifier 111 is electrically connected at filter network, and variable gain buffer amplifier 111 is including at least two kinds of amplifications, and two kinds of amplifications are controlled by same control signal；Cable compensating proportion control unit 113 is electrically connected at variable gain buffer amplifier 111；Converter 112 is electrically connected at cable compensating proportion control unit 113 and filter network；First switch element 114 is electrically connected at cable compensating proportion control unit 113, converter 112 and filter network；FB feedback level 115 is electrically connected at cable compensating proportion control unit 113.Wherein, variable gain buffer amplifier 111 accept filter network output compensation level Vcom amplify after output level Vc to cable compensating proportion control unit 113, level Vc is in cable compensating proportion control unit 113, i.e. single compensation, the feedback level Vfb that FB feedback level 115 provides relatively produces ratio control level Vp, passing ratio control level Vp controls to turn off control logical block, single compensation；Meanwhile, compensate level Vcom and enter again converter 112, be converted to compensate electric current；When compensating level Vcom and increasing to a certain level value, the first switch element 114 is opened, and compensates electric current and enters cable compensating proportion control unit 113, the most again compensates, compensate cable compensating proportion again；When compensating level Vcom and continuing to increase to another level value, the first switch element 114 is closed, and stops compensating again.Refer to Fig. 4, Fig. 4 is cable compensating curve figure, wherein S1 is cable compensating curve of the present utility model, S2 is the cable compensating curve of prior art, cable compensating curve of the present utility model is when charging current value is reduced to Ix, output voltage brings up to Vout3 from Vout2, this guarantees when rechargeable battery i.e. will be filled with, charging current progressively decline time, compared with the flyback power supply changer without cable compensation device again, output voltage improves magnitude of voltage, it is ensured that charger can be full of rechargeable battery.Wherein, the present embodiment is variable gain buffer amplifier 111, but this utility model is not limited thereto.
Yet further, output power regulator 12 comprises: control level generation unit 121, hysteresis control unit 122, second switch unit 123, comparative level provide unit 124；Control level generation unit 121 is electrically connected at the FB feedback end of flyback power supply changer, exports the first control level VH and the second control level VL after receiving the line voltage of flyback power supply changer；Hysteresis control unit 122 is electrically connected at control level generation unit 121, and the first control level VH, the second control level VL are compared by hysteresis control unit 122 with reference potential；Comparative level provides unit 124 to provide three peak point currents comparative level V1, V2, V3, and wherein V1 is low-power peak electric current comparative level, power peak electric current comparative level on the basis of V2, and V3 is high-power peaks electric current comparative level；Second switch unit 123 is electrically connected at hysteresis control unit 122 and comparative level output unit 124, and second switch unit 123 comprises two switchings and opens K1, K2；Wherein, after the first control level VH is more than reference potential, hysteresis control unit 122 controls the switching switch K1 action in second switch unit 123, selects low-power peak electric current comparative level V1 output；When the second control level VL is less than reference potential, controls switching switch K1 action, be switched to reference peak electric current comparative level V2 output；Second switch unit 123 also receives audio frequency suppression control signal, according to audio frequency suppression control signal, second switch unit 123 controls whether switching switch K2 Action Selection exports low peak current comparative level V3.
Further, control level generation unit 121 comprises line voltage detection module 1211 and modular converter 1212；Line voltage detection module 1211 property is connected to the FB feedback end of flyback power supply changer, and line voltage detection module 1211 exports the electric current proportional to line voltage after receiving line voltage；Modular converter 1212 is electrically connected at line voltage detection module 1211 and hysteresis control unit 122, modular converter 122 receives after changing the electric current proportional to line voltage and exports the first control level VH and the second control level VL, modular converter 122 is a current/voltage converter the most in the present embodiment, but this utility model is not limited thereto.
Below in conjunction with Fig. 3, illustrate the work process of this utility model flyback power supply changer,
After the pulse of erasing time dutycycle enters filter network, the compensation level Vcom that output is in proportion with load current；It enters formation level Vc output after variable gain buffer amplifier 111 amplifies and completes single compensation to cable compensating proportion control unit 113, relative feedback current potential Vfb produces ratio control level Vp, passing ratio control level Vp goes to control to close to control logical block, meanwhile compensate level Vcom and enter again converter 112, be converted to compensate electric current；When compensating level Vcom and increasing to a certain level value, the first switch element 114 is opened, and compensates electric current and enters cable compensating proportion control unit 113, the most again compensates, compensate cable compensating proportion again；When compensating level Vcom and continuing to increase to another level value, the first switch element 114 is closed, and stops compensating again.When variable gain buffer amplifier 111 output level Vc changes from small to big to after more than benchmark level, and comparator overturns, produce audio frequency suppression control signal, on the one hand control variable gain amplifier 111 and change gain, on the other hand can go to control other unit.
Owing to armature winding and secondary windings, the auxiliary winding of transformator are reverse, during switching tube Q1 turns on, the line voltage on armature winding creates reverse ratio-voltage on auxiliary winding, and enters FB feedback end by divider resistance R1, R2；FB feedback end connects control level generation unit 121, exports first control level VH proportional to input current and the second control level VL.
After the first control level VH is more than reference potential, hysteresis control unit 122 controls the switching switch K1 action in second switch unit 123, selects low-power peak electric current comparative level V1 output；When the second control level VL is less than reference potential, controls switching switch K1 action, be switched to reference peak electric current comparative level V2 output, by switching different peak point current comparative levels, thus adjust output；Second switch unit 123 also receives audio frequency suppression control signal, according to audio frequency suppression control signal, second switch unit 123 controls whether switching switch K2 Action Selection exports low peak current comparative level V3, it should be noted that if when the peak current detection value of comparator is more than peak value comparison method level V3, comparator then on-off switching tube Q1, it is achieved power controls.
When peak point current comparative level reduces, flyback power supply changer output equal proportion can be controlled and reduce；After peak point current comparative level recovers reference value, the output of flyback power supply changer also recovers former output.
Above are only preferred embodiment of the present utility model; not it is used for limiting the scope that this utility model is implemented; in the case of without departing substantially from this utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and deformation according to this utility model, but these change accordingly and deformation all should belong to the scope of the claims appended by this utility model.
Claims (10)
1. a flyback power supply changer, it is characterised in that comprise:
Filter network, output compensates level；
Cable compensation device again, is electrically connected at described filter network, compensates described compensation level again when the described compensation level inputting described cable compensation device again is low；And
Output power regulator, being electrically connected at the FB feedback end of described flyback power supply changer, described output power regulator is according to the line voltage receiving the output of described FB feedback end thus selects export different peak point current comparative levels and then regulate the output of described flyback power supply changer.
2. flyback power supply changer as claimed in claim 1, it is characterised in that described cable compensation device again comprises:
Buffer amplifier；
Cable compensating proportion control unit, is electrically connected at described buffer amplifier；
Converter, is electrically connected at described cable compensating proportion control unit；
Wherein, described compensation level is inputted after being amplified by buffer amplifier, to cable compensating proportion control unit, described flyback power supply changer is carried out single compensation；The most described converter receives described compensation level and obtains compensation electric current output extremely described cable compensating proportion control unit, compensates described flyback power supply changer again.
3. flyback power supply changer as claimed in claim 2, it is characterized in that, described cable compensation device more also comprises the first switch element, being electrically connected at described cable compensating proportion control unit and described converter, described first switch element receives and according to described compensation level action.
4. flyback power supply changer as claimed in claim 2, it is characterised in that described cable compensation device more also comprises FB feedback level, is electrically connected at described cable compensating proportion control unit.
5. flyback power supply changer as claimed in claim 2, it is characterised in that described buffer amplifier is variable gain buffer amplifier.
6. flyback power supply changer as claimed in claim 5, it is characterised in that described variable gain buffer amplifier includes at least two kinds of amplifications, and the two amplification is controlled by same control signal.
7. the flyback power supply changer as described in any one of claim 1-6, it is characterised in that described output power regulator comprises:
Control level generation unit, exports the first control level and the second control level after receiving the line voltage of described flyback power supply changer；
Hysteresis control unit, is electrically connected at described control level generation unit, and described first control level, described second control level are compared by described hysteresis control unit with reference potential；
Comparative level provides unit, it is provided that peak point current comparative level described at least two；
Second switch unit, being electrically connected at described hysteresis control unit and described comparative level output unit, described hysteresis control unit controls described in described second switch Unit selection output at least two peak point current comparative level one of them according to described first control level, described second control level and reference potential after comparing.
8. flyback power supply changer as claimed in claim 7, it is characterised in that control level generation unit comprises:
Line voltage detection module, exports the electric current proportional to described line voltage after receiving described line voltage；
Modular converter, is electrically connected at described line voltage detection module and described hysteresis control unit, and described modular converter exports described first control level and described second control level after receiving described electric current.
9. flyback power supply changer as claimed in claim 7, it is characterized in that, one of them of peak point current comparative level described in described second switch Unit selection output at least two when described first control level is more than described reference potential, or, wherein another of peak point current comparative level described in described second switch Unit selection output at least two when described second control level is less than described reference potential.
10. flyback power supply changer as claimed in claim 9, it is characterised in that select the most another of peak point current comparative level described in output at least two after described second switch unit receives audio frequency suppression control signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620292780.6U CN205725452U (en) | 2016-04-08 | 2016-04-08 | Flyback power supply changer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620292780.6U CN205725452U (en) | 2016-04-08 | 2016-04-08 | Flyback power supply changer |
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| CN205725452U true CN205725452U (en) | 2016-11-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276402A (en) * | 2016-04-08 | 2017-10-20 | 无锡市晶源微电子有限公司 | Flyback power supply converter |
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2016
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276402A (en) * | 2016-04-08 | 2017-10-20 | 无锡市晶源微电子有限公司 | Flyback power supply converter |
| CN107276402B (en) * | 2016-04-08 | 2023-09-08 | 无锡市晶源微电子股份有限公司 | Flyback power converter |
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Address after: No. 5, Xijin Road, Xinwu District, Wuxi City, Jiangsu Province, 214000 Patentee after: Wuxi Jingyuan Microelectronics Co.,Ltd. Address before: Room 209, Building A, Plot 106-C, Wuxi National High tech Industrial Development Zone, Wuxi City, Jiangsu Province, 214028 Patentee before: Wuxi Jingyuan Microelectronics Co.,Ltd. |