CN103780093A - Switching-type power supply unit - Google Patents

Switching-type power supply unit Download PDF

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Publication number
CN103780093A
CN103780093A CN201210401121.8A CN201210401121A CN103780093A CN 103780093 A CN103780093 A CN 103780093A CN 201210401121 A CN201210401121 A CN 201210401121A CN 103780093 A CN103780093 A CN 103780093A
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China
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power supply
circuit
electrically connected
breakover element
switch
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CN201210401121.8A
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CN103780093B (en
Inventor
林建宇
赖威列
刘亚哲
罗有纲
邱煌仁
林政廷
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Lite On Electronics Guangzhou Co Ltd
Lite On Technology Corp
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Lite On Technology Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The invention relates to a switching-type power supply unit which is used for supplying a stable voltage output for a load. The switching-type power supply unit includes a rectifying circuit, a flyback voltage conversion circuit and a non-isolation voltage adjustment circuit. The rectifying circuit receives AC signals and rectifies and then outputs the AC signals. The flyback voltage conversion circuit is electrically connected with the rectifying circuit and used for converting the rectified AC signals into DC signals. The non-isolation voltage adjustment circuit is electrically connected between the flyback voltage conversion circuit and the load and used for eliminating voltage ripples of the DC signals and then outputting the DC signals to the load. Thus setting of a high-voltage capacitor in front of the flyback voltage conversion circuit is not needed and the volume and material cost of the switching power supply unit can be reduced significantly.

Description

Switched power supply
Technical field
The present invention relates to a kind of power supply unit, refer to especially a kind of switched power supply that can suppress output ripple.
Background technology
Along with the progress in epoch, electronic product is applied in the mankind's life widely, but energy starved problem is day by day serious, makes people more and more pay attention to the service efficiency of electronic product.And most electronic product all needs to use AC/DC converter, convert the AC power in electric power system to DC power supply that electronic product needs, therefore need to extensively inquire into and study various low costs and high efficiency AC/DC converter.
Ac/dc conversion is now reached with diode rectification mostly, although this kind of practice is cheap and simply firm, but due to the serious nonlinear distortion of input current, low-frequency harmonics is rolled up, cause power factor (Power Factor) too low and increase fictitious power, cause expending of energy, also can cause the unstable of electric power system simultaneously, the quality of impact power supply.
Consulting Fig. 1, is the circuit framework of power supply unit now, wherein take adapter (Adapter) 900 as example explanation.Adapter 900 mostly now is the framework of two-stage type, and prime is booster type (Boost) power factor corrector 910, and rear class is isolated DC/direct current transducer 920.But, for example, the more unstable area of civil power (: south east asia), capacitor C in boost power factor corrector 910 can need higher withstand voltage, damage with the unstable circuit that causes adapter 900 that prevents input voltage, but the volume of high withstand voltage capacitor C (normally electrochemical capacitor) is excessive, and makes cost higher because electrochemical capacitor is more rare.Therefore power supply unit, how to realize low cost, High Power Factor and high conversion efficiency is emphasis of the present invention then.
Summary of the invention
The object of the present invention is to provide the switched power supply of a kind of low cost, High Power Factor and high conversion efficiency.
Switched power supply of the present invention, in order to provide load stable Voltage-output, this switched power supply comprises rectification circuit, flyback (Flyback) voltage conversion circuit and non-isolated voltage-regulating circuit.Rectification circuit receives AC signal, and will after this AC signal rectification, export.Flyback voltage conversion circuit electrical connection rectification circuit, for converting the AC signal after rectification to direct current signal.Between non-isolated voltage-regulating circuit electrical connection flyback voltage conversion circuit and load, after eliminating the voltage ripple of this direct current signal, export load to.So will need to before flyback voltage conversion circuit 20, high-voltage capacitor be set, can significantly reduce volume and the material cost of switched power supply.
Further, flyback voltage conversion circuit comprises transforming circuit, diverter switch, breakover element and electric capacity.One end electrical connection rectification circuit of the primary side of transforming circuit, the other end is electrically connected diverter switch; Diverter switch has first end, controlled control end and second end of ground connection of the primary side of electrical connection transforming circuit; Breakover element can be positioned at high-pressure side (High Side) and have the first end of one end of the secondary side of electrical connection transforming circuit, and be electrically connected the second end of non-isolated voltage-regulating circuit, one end of electric capacity is electrically connected the second end of this breakover element, and the other end is electrically connected the other end of the secondary side of transforming circuit.Preferably, the junction of the secondary side of electric capacity and transforming circuit is ground connection.
In addition, breakover element also can be positioned at low-pressure side (Low Side), and in the case, one end of the secondary side of one end electrical connection transforming circuit of electric capacity, the other end of the first end electrical connection electric capacity of breakover element, the other end of the secondary side of the second end electrical connection transforming circuit of breakover element.
Breakover element can be diode or various semiconductor switch, for example: metal-oxide half field effect transistor (MOSFET) etc.
Non-isolated voltage-regulating circuit can be synchronous rectification voltage-dropping type (Buck) transducer, comprising the first switch, second switch, energy storage inductor and storage capacitor.The first switch has the first end of electrical connection flyback voltage conversion circuit, controlled control end and the second end; Second switch has first end, controlled control end and second end of ground connection of the second end of this first switch of electrical connection; The first end of one end electrical connection second switch of energy storage inductor, other end electrical connection load; One end electrical connection load of storage capacitor, other end ground connection.
Non-isolated voltage-regulating circuit can be also booster type (Boost) transducer or liter-voltage-dropping type (Buck-Boost) transducer, and the output voltage of flyback voltage conversion circuit is depended in the selection of its framework.
Beneficial effect of the present invention is: by prime flyback voltage conversion circuit corrected output factor, the non-isolated voltage-regulating circuit of rear end is eliminated voltage ripple, can avoid input to use the electrochemical capacitor of high pressure, and reach the advantages such as High Power Factor, high conversion efficiency and low-voltage ripple and low cost and volume are little simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the existing two-stage type adapter of explanation;
Fig. 2 is the preferred embodiment of explanation switched power supply of the present invention;
Fig. 3 is the circuit diagram of the flyback voltage conversion circuit of explanation the present embodiment, and wherein breakover element is positioned at high-pressure side (High Side) and explains as an example of diode D example;
Fig. 4 is the circuit diagram of the flyback voltage conversion circuit of explanation the present embodiment, and wherein breakover element is positioned at low-pressure side (Low Side) and explains as an example of transistor M example;
Fig. 5 is the circuit diagram of the non-isolated voltage-regulating circuit of explanation the present embodiment;
Fig. 6 is that the switched power supply of explanation the present embodiment is 90,115,230 and 264 (V) at AC signal voltage, and rated output power 25%, 50%, 75% and 100% under the curve chart of conversion efficiency; And
Fig. 7 is that the switched power supply of explanation the present embodiment is 90,115,230 and 264 (V) at AC signal voltage, and rated output power 25%, 50%, 75% and 100% under the curve chart of power factor.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
Consult Fig. 2, for the preferred embodiment of switched power supply 100 of the present invention, this switched power supply 100 can be the various power supply equipments such as adapter (Adapter), open frame formula (Open Frame) power supply unit.The switched power supply 100 of the present embodiment comprises rectification circuit 10, is electrically connected on flyback (Flyback) voltage conversion circuit 20 of rectification circuit 10, and is electrically connected on the non-isolated voltage-regulating circuit 30 of flyback voltage conversion circuit 20.Switched power supply 100 of the present invention first utilizes single-stage flyback voltage conversion circuit 20 corrected output factors, then eliminates voltage ripple by non-isolated voltage-regulating circuit 30, so that load R to be provided loadstable Voltage-output.
Coordinate and consult Fig. 3, rectification circuit 10 comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.
The anode electrical connection of the first diode D1 exchanges the positive pole of (AC) power supply, and the cathodic electricity of the first diode D1 connects the negative electrode of the second diode D2.The negative pole of the anode electrical connection AC power of the second diode D2.The cathodic electricity of the 3rd diode D3 connects the anode of the first diode D1, the plus earth of the 3rd diode D3.The cathodic electricity of the 4th diode D4 connects the anode of the second diode D2, the plus earth of the 4th diode D4.
Flyback voltage conversion circuit 20 comprises transforming circuit T, diverter switch S, breakover element and capacitor C p.In an embodiment, breakover element is positioned at high-pressure side (High Side) and is diode D, but can be also various semiconductor switchs, for example: metal-oxide half field effect transistor (MOSFET) etc., and capacitor C pcan be multi-layer ceramic capacitance (Multilayer Ceramic Capacitor, MLCC), solid capacitor (Polymer Capacitor), or liquid aluminium matter electrochemical capacitor etc., no matter but be breakover element or capacitor C pall be not limited with the present embodiment or mentioned kind.
One end electrical connection rectification circuit 10 of the primary side of transforming circuit T, the other end is electrically connected diverter switch S.Diverter switch S is N-type metal-oxide half field effect transistor, it has drain electrode (first end), the electrical connection pulse-width modulation module (PWM of the primary side of electrical connection transforming circuit T, figure does not show) grid (control end), and the source electrode of ground connection (the second end).One end of the secondary side of anode (being the first end of breakover element) the electrical connection transforming circuit T of diode D, its negative electrode (being the second end of breakover element) is electrically connected non-isolated voltage-regulating circuit 30.Capacitor C pthe negative electrode of one end electrical connection diode D, the other end is electrically connected the other end of the secondary side of transforming circuit T.And in the present embodiment, capacitor C pwith the junction of the secondary side of transforming circuit T be ground connection.
In addition, breakover element of the present invention also can be positioned at low-pressure side (Low Side), and as shown in Figure 4, it is take transistor M as example, but can be also diode D.Transistor M has and capacitor C pfirst end (being the first end of breakover element), the electrical connection pulse-width modulation module (PWM of the other end, figure do not show) control end, and the second end of the other end of the secondary side of transforming circuit T (being the second end of breakover element), and under this aspect, capacitor C pwith the junction of transistor M be ground connection.Certainly, the circuit design of flyback voltage conversion circuit 20 is not limited to this, if when breakover element is positioned at high-pressure side and is N-type metal-oxide half field effect transistor, the first end of breakover element is the drain electrode of N-type metal-oxide half field effect transistor, and the second end of breakover element is the source electrode of N-type metal-oxide half field effect transistor; If when breakover element is positioned at low-pressure side and is diode, the first end of breakover element is the anode of this diode, the second end of breakover element is the negative electrode of this diode, can reach so equally effect of the present invention.
Coordinate and consult Fig. 5, the non-isolated voltage-regulating circuit 30 of the present embodiment is for synchronous rectification voltage-dropping type (Buck) transducer, comprising the first switch Q1, second switch Q2, energy storage inductor L sand storage capacitor C s.
The first switch Q1 is N-type metal-oxide half field effect transistor, and it has the capacitor C of electrical connection flyback voltage conversion circuit 20 pdrain electrode (first end), electrical connection pulse-width modulation module (PWM) grid (control end) and source electrode (the second end).Second switch Q2 is N-type metal-oxide half field effect transistor, it has the drain electrode (first end) of the source electrode of electrical connection the first switch Q1, the grid (control end) of electrical connection pulse-width modulation module (PWM), and the source electrode of ground connection (the second end).Energy storage inductor L sthe drain electrode of one end electrical connection second switch Q2, the other end is electrically connected load R load.Storage capacitor C scan be liquid aluminium matter electrochemical capacitor, solid capacitor, laminated ceramic electric capacity (MLCC) etc., but be not limited with mentioned kind, its one end electrical connection load R load, the other end is ground connection.What specify is, non-isolated voltage-regulating circuit 30 can be also the various electric pressure converters (Converter) such as booster type (Boost) transducer, liter-voltage-dropping type (Buck-Boost) transducer, or voltage regulator (Regulator) etc., the output voltage of flyback voltage conversion circuit 20 is depended in the selection of its framework, and the first switch Q1 and second switch Q2 also can be P type metal-oxide half field effect transistor, are neither limited with the present embodiment.
Suitably control the first switch Q1 and second switch Q2 by pulse-width modulation module (PWM) and switch, non-isolated voltage-regulating circuit 30 can be as shown in following table one in 25%, 50%, 75% and 100% conversion efficiency of rated output power:
Table one
Vin(V) Iin(A) Vout(V) Iout(A) η(%)
23.82 0.953 19.018 1.184 99.24
23.69 1.913 19.014 2.367 99.31
23.56 2.885 19.010 3.553 99.35
23.39 3.884 19.005 4.736 99.04
What specify is, table one is the experimental data of the application gained take switched power supply 100 as portable power source adapter, and Vin and Iin are respectively voltage and the electric current of input exchange signal, Vout and Iout are respectively output voltage and the output current of non-isolated voltage-regulating circuit 30, and η is the conversion efficiency of non-isolated voltage-regulating circuit 30.Therefore, by design of the present invention, this switched power supply 100 is compared to the portable power source adapter with wattage level now, output ripple voltage can be reduced to originally 10%.
Rectification circuit 10 receives and exchanges the AC signal that (AC) power supply provides, and will after this AC signal rectification, export flyback voltage conversion circuit 20 to, flyback voltage conversion circuit 20 is in order to revise the power factor of switched power supply 100, alternating current is modified to and the synchronous sinusoidal waveform of supply voltage, and converting the AC signal after rectification to direct current signal, non-isolated voltage-regulating circuit 30 exports load R to after eliminating the voltage ripple of this direct current signal again load.In other words, this switched power supply 100 carrys out corrected output factor by single-stage flyback voltage conversion circuit 20, to avoid input to use the electrochemical capacitor of high pressure, recycle simple non-isolated voltage-regulating circuit 30 and can eliminate the ripple of output voltage, connect ripple problems of too to solve because of the 120Hz being caused without primary side high-voltage electrolysis capacitor, reach effect of High Power Factor, high conversion efficiency and low-voltage ripple simultaneously, and can also be by control capacitance C phold time (Hold-up Time) with the specification adjustment according to customer demand, avoid the waste of cost.
What specify is, the primary side of the transforming circuit T of flyback voltage conversion circuit 20 does not need to arrange the withstand voltage electric capacity of height that volume is larger, and the electric capacity using at flyback voltage conversion circuit 20 secondary sides is high withstand voltage because not needing, therefore the volume of switched power supply 100 and material cost can significantly reduce, also owing to having reduced capacity load, therefore do not need extra power factor correcting circuit to carry out bring to power factor, can meet relevant laws and regulations of energy yet.Because switched power supply 100 can reduce 20% on volume, thus particularly suitable at the product of limited space, for example Mobile electric power adapter.
Consult Fig. 6 and Fig. 7, for the switched power supply 100 of the present embodiment is 90,115,230 and 264 (V) at AC signal voltage, and rated output power 25%, 50%, 75% and 100% under conversion efficiency (Efficiency) and power factor (Power Factor).What specify is, Fig. 5 and Fig. 6 are the experimental data of the application gained take switched power supply 100 as Mobile electric power adapter equally, wherein, the minimum average conversion efficiency of this switched power supply 100 is 87.91%, and also can meet the requirement that power factor exceedes 0.9 laws and regulations of energy, really can reach the object of High Power Factor and high conversion efficiency.
In sum, switched power supply 100 of the present invention carrys out corrected output factor by prime with single-stage flyback voltage conversion circuit 20, so will need to before flyback voltage conversion circuit 20, high-voltage capacitor be set, also reduce the circuit infringement because of unstable the caused switched power supply 100 of input ac power, therefore can be applicable to civil power input shakiness or the higher area of civil power simultaneously.Relend afterwards the high voltage of eliminating secondary side by non-isolated voltage-regulating circuit 30 by rear end and connect ripple, make in the standard of output power limit, reach the effect that improves power output and suppress output ripple, and the holistic cost of switched power supply 100 of the present invention is compared to the cost savings 15-20% of power supply unit now with high-voltage electrolysis capacitor, moreover the present invention so designs also with the same ground of power supply unit of two-stage type design now and can meet the requirement that power factor exceedes 0.9 laws and regulations of energy, therefore really can reach object of the present invention.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the method for above-mentioned announcement and technology contents to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (10)

1. a switched power supply, in order to provide load stable Voltage-output; It is characterized in that:
This switched power supply comprises:
Rectification circuit, receives AC signal, and will after this AC signal rectification, export;
Flyback voltage conversion circuit, is electrically connected this rectification circuit, for converting the AC signal after this rectification to direct current signal; And
Non-isolated voltage-regulating circuit, is electrically connected between this flyback voltage conversion circuit and this load, after eliminating the voltage ripple of this direct current signal, exports this load to.
2. switched power supply as claimed in claim 1, it is characterized in that: this flyback voltage conversion circuit comprises transforming circuit, diverter switch, breakover element and electric capacity, one end of the primary side of this transforming circuit is electrically connected this rectification circuit, and the other end is electrically connected this diverter switch; This diverter switch has first end, controlled control end and second end of ground connection of the primary side of this transforming circuit of electrical connection; This breakover element has the first end of one end of the secondary side of this transforming circuit of electrical connection, and be electrically connected the second end of this non-isolated voltage-regulating circuit, one end of this electric capacity is electrically connected the second end of this breakover element, and the other end is electrically connected the other end of the secondary side of this transforming circuit.
3. switched power supply as claimed in claim 2, is characterized in that: this breakover element is diode, the anode that the first end of this breakover element is this diode, the negative electrode that the second end of this breakover element is this diode.
4. switched power supply as claimed in claim 2, is characterized in that: this breakover element is semiconductor switch.
5. switched power supply as claimed in claim 1, it is characterized in that: this flyback voltage conversion circuit comprises transforming circuit, diverter switch, breakover element and electric capacity, one end of the primary side of this transforming circuit is electrically connected this rectification circuit, and the other end is electrically connected this diverter switch; This diverter switch has first end, controlled control end and second end of ground connection of the primary side of this transforming circuit of electrical connection; One end of this electric capacity is electrically connected one end of the secondary side of this transforming circuit, and this breakover element has the first end of the other end of this electric capacity of electrical connection, and is electrically connected the second end of the other end of the secondary side of this transforming circuit.
6. switched power supply as claimed in claim 5, is characterized in that: this breakover element is diode, the anode that the first end of this breakover element is this diode, the negative electrode that the second end of this breakover element is this diode.
7. switched power supply as claimed in claim 5, is characterized in that: this breakover element is semiconductor switch.
8. switched power supply as claimed in claim 1, it is characterized in that: this non-isolated voltage-regulating circuit comprises the first switch, second switch, energy storage inductor and storage capacitor, this first switch has the first end of this flyback voltage conversion circuit of electrical connection, controlled control end and the second end; This second switch has first end, controlled control end and second end of ground connection of the second end of this first switch of electrical connection; One end of this energy storage inductor is electrically connected the first end of this second switch, and the other end is electrically connected this load; One end of this storage capacitor is electrically connected this load, other end ground connection.
9. switched power supply as claimed in claim 1, is characterized in that: this non-isolated voltage-regulating circuit be buck converter, boosting type converter, liter-buck converter and voltage regulator one of them.
10. switched power supply as claimed in claim 1, is characterized in that: this switched power supply is adapter or open frame formula power supply unit.
CN201210401121.8A 2012-10-19 2012-10-19 Switching-type power supply unit Active CN103780093B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105097280A (en) * 2014-05-09 2015-11-25 株式会社村田制作所 Voltage smoothing circuit, voltage conversion circuit, and method for controlling voltage to be applied to multilayer capacitor

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CN102427293A (en) * 2012-01-11 2012-04-25 西南交通大学 Low output ripple wave parallel power-factor correction (PFC) transform control method and device
CN102497105A (en) * 2011-12-02 2012-06-13 深圳市菱晟科技有限公司 Synchronous-rectification flyback switching power supply device and control method thereof

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Publication number Priority date Publication date Assignee Title
US20050169017A1 (en) * 2001-11-29 2005-08-04 Muegge Mark R. Methods for digital regulation of power converters using primary-only feedback
CN1722593A (en) * 2004-07-14 2006-01-18 伊博电源（杭州）有限公司 Self-drive circuit for switch power supply
TW200838114A (en) * 2007-03-09 2008-09-16 Leadtrend Tech Corp Switching-mode power converter and pulse-width-modulation control circuit for primary-side feedback control
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105097280A (en) * 2014-05-09 2015-11-25 株式会社村田制作所 Voltage smoothing circuit, voltage conversion circuit, and method for controlling voltage to be applied to multilayer capacitor
CN105097280B (en) * 2014-05-09 2018-01-02 株式会社村田制作所 Voltage smoothing circuit, voltage conversion circuit and the voltage control method applied to cascade capacitor

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