CN202019303U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN202019303U CN202019303U CN2011201429603U CN201120142960U CN202019303U CN 202019303 U CN202019303 U CN 202019303U CN 2011201429603 U CN2011201429603 U CN 2011201429603U CN 201120142960 U CN201120142960 U CN 201120142960U CN 202019303 U CN202019303 U CN 202019303U
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 230000005669 field effect Effects 0.000 claims abstract description 9
- 238000010521 absorption reaction Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 30
- 238000004804 winding Methods 0.000 claims description 7
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- 238000013461 design Methods 0.000 description 5
- 230000010363 phase shift Effects 0.000 description 5
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- 206010044565 Tremor Diseases 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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- 230000008676 import Effects 0.000 description 1
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- 239000000696 magnetic material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model relates to a switching power supply. The switching power supply comprises an input electromagnetic interference filter, a rectification and filter circuit, a power transformation circuit, a pulse width modulation (PWM) control circuit and an output rectification and filter circuit, wherein the power transformation circuit and the output rectification and filter circuit are connected with each other through a coupling transformer; the power transformation circuit is connected with a primary coil of the coupling transformer; the output rectification and filter circuit is connected with a secondary coil of the coupling transformer; the power transformation circuit comprises power tubes S1, S2, S3 and S4, capacitors C1, C2 and C3, an inductor Lk and diodes D1 and D2; the power tube S1 and the power tube S3 of the power tubes S1, S2, S3 and S4 are connected in series with each other to form an advanced arm and reversely connected in parallel with the diodes D1 and D2 and the capacitors C1, C2 and C3 having functions of external connection and absorption; the power tube S2 and the power tube S4 form a lagging arm; the output rectification and filter circuit comprises a field effect tube Sc, a diode Da, a diode Db, a diode Dc and a capacitor Cc; and the field effect tube Sc is connected in parallel with the diode Dc and connected in series with the capacitor Cc to form a frequency multiplication circuit. In a double-path whole bridge transformation mode, two control systems which can adjust each other dynamically are provided, so the stability of the system and the voltage stabilization characteristic of output voltage can be guaranteed during wide range output.
Description
Technical field
The utility model relates to the Switching Power Supply to electric power system, relates in particular to the improvement to power conversion circuit in the Switching Power Supply and output rectifier and filter.
Background technology
Switching Power Supply be use by the circuit controling switch pipe carry out at a high speed road logical with end.Direct current is converted into high-frequency alternating current offers transformer and carry out transformation, thereby produce the device of needed one or more groups voltage.Its main circuit comprises input Electromagnetic interference filter (EMI), current rectifying and wave filtering circuit, power conversion circuit, PWM (pulse width modulation) controller circuitry, output rectifier and filter etc.Auxiliary circuit has input over under-voltage protection circuit, output over under-voltage protection circuit, output overcurrent protective circuit, output short circuit protection circuit etc.
DC/DC (power conversion circuit) uses more have hard switching pattern (comprising direct diode rectification, synchronous rectification etc.) and soft switching mode at present.Wherein hard switching is because power tube is opened and when end, voltage/current is non-vanishing, and the stress of high pressure and big electric current has greatly increased switching loss, causes converter efficiency lower, so the application of hard switching on the efficient electrical power transducer is very limited merely.
And the application of soft switch has greatly reduced switching loss because switching tube electronics stress is zero, and the designer is used higher inversion frequency, and it is helpful obtaining higher conversion efficiency.And that the technology of soft switch also has is a variety of, and most widely used is exactly the resonant type soft-switch technology, and the mode by resonance reaches and opens/purpose of no-voltage/zero current when ending exactly.And this resonant type soft-switch is divided into the resonant type soft-switch of band auxiliary switch control and not with the resonant type soft-switch of auxiliary switch.The resonant type soft-switch of band auxiliary switch formula is because control is complicated, and the circuit complexity has certain restriction in application facet.
" power technology application " the 12nd phase in 2008 (International Standard Serial Number: ISSN 0219-2713), " based on the development of the soft switch DC power supply of ZVZCS PWM of UC3875 " (Mu Xiangyong, Chen Qingchuan, Zhu Ming), describe the opering characteristic of electric apparatus and the basic function of phase-shifting resonance control chip UC3875 in detail, and with its served as control core design the soft switch DC power supply of phase shift ZVZCS PWM of 1.2kW, a 70kHz.And carried out emulation experiment, experiment shows: be that the control core part-structure is simple and reliable with UC3875, the electric power main circuit switching tube has all been realized soft switch, and overcome the shortcoming of simple ZVS or the soft switching mode of ZCS, can effectively reduce the loss that causes in the switching tube switching process, help improving the mains switch frequency, reduce power volume and weight.But analyze the concrete technical scheme (document Fig. 1) that the document provides, be not difficult to find that transformer both sides frequency is identical.Like this, import under the big situation of wide region and load variations, exist the no-voltage of after-power pipe is opened unfavorable situation.
The utility model content
The utility model is at above problem, provides a kind of phased soft switch to carry when changing at band, the Switching Power Supply that can control the accurate resonance of after-power pipe.
The technical solution of the utility model is: comprise input Electromagnetic interference filter, current rectifying and wave filtering circuit, power conversion circuit, pwm control circuit and output rectifier and filter, described power conversion circuit links to each other by coupling transformer with output rectifier and filter, power conversion circuit connects described coupling transformer primary coil, output rectifier and filter connects described coupling transformer secondary coil
Described power conversion circuit comprises power tube S1-S4, capacitor C1-C3, inductor Lk and diode D1-D2; Power tube S1 among the described power tube S1-S4, power tube S3 serial connection is for leading arm, and the described diode D1-D2 of reverse parallel connection, plays the capacitor C1-C3 of external absorption; Described power tube S2, power tube S4 constitute lagging leg;
Described output rectifier and filter comprises field effect transistor Sc, diode Da, diode Db, diode Dc and capacitor C c; Described field effect transistor Sc also meets diode Dc, is connected in series with capacitor C c to constitute frequency multiplier circuit again.
Also be provided with auxiliary winding on the described secondary coil, described auxiliary winding connects described PWM controller circuitry.
Be provided with the UC3875 chip in the described pwm control circuit, described power tube S1-S4 connects the UC3875 chip respectively.
What the utility model at first adopted is the DC/DC conversion of phased soft switch technique, the purpose that adopts phased soft switch technique is to avoid the application controls of resonant type soft-switch complexity, can make simultaneously switching tube under no-voltage/zero current condition, open and end, thereby greatly reduced the switching loss of power device, improved efficient effectively.Reduced the weight and volume of module.
Adopt two-way full-bridge pattern conversion, improve the service efficiency of conversion transformer, and the conversion of two-way full-bridge balance and dynamic adjustments mutually when low pressure output and high pressure output, effectively improve output voltage shakiness and the control system phase margin that the duty-cycle loss under single full-bridge mode causes and caused problems such as system works instability inadequately.
By the frequency multiplication phase control unit, control the phase change of DC converting, dynamically adjust the load balance of two-way phased circuit, reach the conversion of direct current frequency multiplication and the characteristics of each phased circuit fundamental frequency work.The PWM switching frequency that also is complete machine is doubled, and corresponding to each phased full-bridge circuit, their operating frequency all is a fundamental frequency.
What the utility model adopted is the resonant type soft-switch technology of not being with auxiliary switch, promptly phased soft switch technique, and it has, and basic circuit is simple, and control is succinct, and the fault point is few, the controlled stability advantages of higher.And used frequency doubling technology innovatively, adopt two phased translative mode of major loop frequency multiplication, dynamically adjust the load variations of two major loops automatically by double circuit phase shifting control unit, remedied phased circuit effectively and under the big situation of input wide region and load variations, the no-voltage of hysteresis pipe has been opened unfavorable situation.
This phase shift frequency doubling technology, owing to solved the accurate resonance control to the after-power pipe when band carries variation of phased soft switch, soft switch technique to complete machine conversion efficiency aspect contrast other types has great superiority, the more succinct relatively more stable extensive adaptability of using of then having brought of control major loop, the application in energy-efficient field has the top standard.In terms of existing technologies, what DC/DC used at present substantially all is to adopt single bridging to change circuit, this topological structure is suitable for exporting the system that wants voltage stabilizing, application for the adjusting of output wide region, can bring no-load voltage ratio excessive, duty-cycle loss causes output voltage vibration unstable, in addition can not voltage stabilizing during low pressure etc. problem.And cause the phase margin of control system not enough easily, the system works instability.Two-way full-bridge pattern conversion has the control system of two mutual dynamic adjustments, the stability of system and the stabilized voltage characteristic of output voltage in the time of can accomplishing wide region output.
Description of drawings
Fig. 1 is the structure diagram of power conversion circuit and output rectifier and filter in the utility model.
Embodiment
The utility model comprises input Electromagnetic interference filter, current rectifying and wave filtering circuit, power conversion circuit, pwm control circuit and output rectifier and filter, described power conversion circuit links to each other by coupling transformer with output rectifier and filter, power conversion circuit connects described coupling transformer primary coil, output rectifier and filter connects described coupling transformer secondary coil, as shown in Figure 1:
Described power conversion circuit comprises power tube S1-S4, capacitor C1-C3, inductor Lk and diode D1-D2; Power tube S1 among the described power tube S1-S4, power tube S3 serial connection is for leading arm, and the described diode D1-D2 of reverse parallel connection, plays the capacitor C1-C3 of external absorption; Described power tube S2, power tube S4 constitute lagging leg;
Described output rectifier and filter comprises field effect transistor Sc, diode Da, diode Db, diode Dc and capacitor C c; Described field effect transistor Sc also meets diode Dc, is connected in series with capacitor C c to constitute frequency multiplier circuit again.
Also be provided with auxiliary winding on the described secondary coil, described auxiliary winding connects described PWM controller circuitry.
Be provided with the UC3875 chip in the described pwm control circuit, described power tube S1-S4 connects the UC3875 chip respectively.
According to Fig. 1, formal from the topology of main circuit, be asymmetric as can be seen.The basic control mode of four main power tubes is phase shifting control, and leading arm is S1, S3, anti-and diode and external absorption electric capacity; Lagging leg is S2, S4, does not have anti-and diode and absorption electric capacity.The control timing of auxilliary pipe (field effect transistor) Sc is that the rising edge with leading arm S1, S3 control impuls triggers a monostable high level signal, the service time of the auxilliary pipe of control.Thereby the switching frequency of auxilliary pipe is the twice that former limit is responsible for, and is operated in the frequency multiplication state.The purpose of this circuit is to realize leading arm S1, S3 zero voltage switch, and lagging leg S2, S4 Zero Current Switch reduce the switching loss of being responsible for, and for improving the operating frequency of complete machine, realizes the high conversion efficiency preparatory condition in the full-load range simultaneously.
Operation principle of the present utility model is summarized as follows:
As S1, when S4 opens, former limit energy transmits to secondary.S1 closes and has no progeny, and primary current turns to C1, C2, the C1 charging, and the C2 discharge, the shutoff voltage on the S1 is slowly to rise at this moment, belongs to no-voltage and turn-offs.Until the anti-and diode current flow of managing S3 down.Open down pipe S3 this moment, genus presses off logical zero point.The rising edge that S3 opens pulse triggers a high level simultaneously and opens auxilliary pipe SC, and at this moment, the voltage of secondary clamp capacitor is added in becomes excitation on the secondary, former limit can induce higher voltage, the effect of this voltage is that primary current is resetted rapidly, is lagging leg S2, S4 Zero Current Switch preparatory condition.Primary current returns after zero, and auxilliary pipe SC just turn-offs.Auxilliary pipe is in case close, secondary is equivalent to short circuit, original edge voltage is corresponding also to be zero, voltage on the capacitance C3 can instead be added on the lagging leg S4 pipe at this moment, during design,, reasonably use the inverted character of IGBT as long as follow the principle of pulsating voltage amplitude on the restriction capacitance, just can successfully prevent the reverse flow of transformer primary current, and guarantee that reverse avalanche breakdown does not take place IGBT.After this, lagging leg S4 zero-current switching.Because the existence of former limit leakage inductance, opening of lagging leg S2 also is zero current turning-on.Primary current is reverse, enters down the circulation of half period, and this moment, the secondary rectifying tube was also finished commutation, because the existence of clamp capacitor Cc, the reverse spike voltage of rectifying tube can suppress well.
Because the phase shift frequency doubling technology is to having adopted two major loop phased circuits, need have the complete phased full-bridge main circuit of two-way, need to adopt the magnetic material of high magnetic permeability to use as conversion transformer simultaneously, cost can improve for common DC/DC.And this The Application of Technology mainly is the conversion efficiency that promotes transducer, so present this technology is mainly used in some to conversion efficiency and the demanding field of functional reliability,
The utility model is through test, and its technical indicator is as follows:
Working temperature-40 degree～120 degree are interval;
Input voltage range 200VDC-400VDC (165VAC-265VAC);
Output voltage DC14V～260V;
Output-current rating 10A;
Rated output voltage is 220V/110V;
Adopt the above basic inversion frequency (inversion frequency that is equivalent to complete machine 200K) of 100K;
Efficient 〉=95%;
The DC/DC transducer surpasses 11A at output current, disconnects output; Recover normal when re-powering; Possesses short-circuit protection function.
At last, the utility model is summarized as follows: because the core of present technique is exactly to control the complete phase-shifting full-bridge master of two-way respectively by phased frequency multiplier circuit to change the loop, and by phase control techniques by two-way major loop resonance work in order successively, reach the purpose of frequency multiplication.Simultaneously, adjust the load current in two loops, reach the purpose of current-sharing output synchronous coordination work by dynamic adjustment circuit.So how these two circuit of appropriate design are exactly the main difficult point that can this project realize.
The design of phased frequency multiplier circuit, be based on special-purpose UC3875 chip as the phase-shift soft switch main control chip, send the fundamental frequency pwm signal of change-over circuit by UC3875, by designing a frequency multiplier circuit that the dead band is controllable, divide the two-way pwm signal that occurs frequently with PWM, the phase angle that they differ is adjustable.Control two-way phase shift main circuit switch pipe respectively by this two-way pwm signal then, reach in order the purpose of conversion this time.
And dynamically adjust circuit design principle is by designing the auxiliary winding of a main conversion transformer, the dynamic current ratio of sampling main transformer changes, dynamic adjustment by amplifier FEEDBACK CONTROL current-sharing electric current, the dead band that influences frequency multiplier circuit is adjusted, thereby reaches the dynamic adjustments purpose of loop load in pairs.
Claims (3)
1. Switching Power Supply, comprise input Electromagnetic interference filter, current rectifying and wave filtering circuit, power conversion circuit, pwm control circuit and output rectifier and filter, described power conversion circuit links to each other by coupling transformer with output rectifier and filter, power conversion circuit connects described coupling transformer primary coil, output rectifier and filter connects described coupling transformer secondary coil, it is characterized in that
Described power conversion circuit comprises power tube S1-S4, capacitor C1-C3, inductor Lk and diode D1-D2; Power tube S1 among the described power tube S1-S4, power tube S3 serial connection is for leading arm, and the described diode D1-D2 of reverse parallel connection, plays the capacitor C1-C3 of external absorption; Described power tube S2, power tube S4 constitute lagging leg;
Described output rectifier and filter comprises field effect transistor Sc, diode Da, diode Db, diode Dc and capacitor C c; Described field effect transistor Sc also meets diode Dc, is connected in series with capacitor C c to constitute frequency multiplier circuit again.
2. Switching Power Supply according to claim 1 is characterized in that, also is provided with auxiliary winding on the described secondary coil, and described auxiliary winding connects described PWM controller circuitry.
3. Switching Power Supply according to claim 1 is characterized in that, is provided with the UC3875 chip in the described pwm control circuit, and described power tube S1-S4 connects the UC3875 chip respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201429603U CN202019303U (en) | 2011-05-06 | 2011-05-06 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201429603U CN202019303U (en) | 2011-05-06 | 2011-05-06 | Switching power supply |
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| Publication Number | Publication Date |
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| CN202019303U true CN202019303U (en) | 2011-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201429603U Expired - Fee Related CN202019303U (en) | 2011-05-06 | 2011-05-06 | Switching power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104756385A (en) * | 2012-10-31 | 2015-07-01 | 麻省理工学院 | Systems and methods for a variable frequency multiplier power converter |
| CN104852557A (en) * | 2015-06-12 | 2015-08-19 | 扬州大学 | Digital-analog hybrid phase-shift frequency-multiplication modulation method for power converter |
| CN105450034A (en) * | 2016-01-06 | 2016-03-30 | 航天长峰朝阳电源有限公司 | Chained double-bridge self-coupled stepdown topology |
-
2011
- 2011-05-06 CN CN2011201429603U patent/CN202019303U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104756385A (en) * | 2012-10-31 | 2015-07-01 | 麻省理工学院 | Systems and methods for a variable frequency multiplier power converter |
| CN104756385B (en) * | 2012-10-31 | 2018-07-06 | 麻省理工学院 | For the system and method for variable frequency multiplier power converter |
| CN104852557A (en) * | 2015-06-12 | 2015-08-19 | 扬州大学 | Digital-analog hybrid phase-shift frequency-multiplication modulation method for power converter |
| CN104852557B (en) * | 2015-06-12 | 2017-08-25 | 扬州大学 | Numerical model analysis phase shift multiple-frequency modulation method applied to power inverter |
| CN105450034A (en) * | 2016-01-06 | 2016-03-30 | 航天长峰朝阳电源有限公司 | Chained double-bridge self-coupled stepdown topology |
| CN105450034B (en) * | 2016-01-06 | 2018-12-28 | 航天长峰朝阳电源有限公司 | A kind of chain type doube bridge self-coupling voltage reducing topology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER COMPANY STATE ELECTRIC NET Effective date: 20130514 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130514 Address after: 225009 Weiyang Road, Jiangsu, China, No. 179, No. Patentee after: Yangzhou Power Supply Company of Jiangsu Electric Power Company Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 225009 Weiyang Road, Jiangsu, China, No. 179, No. Patentee before: Yangzhou Power Supply Company of Jiangsu Electric Power Company |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111026 Termination date: 20180506 |