CN110350783A - A kind of boost module for UPS - Google Patents
A kind of boost module for UPS Download PDFInfo
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- CN110350783A CN110350783A CN201810305705.2A CN201810305705A CN110350783A CN 110350783 A CN110350783 A CN 110350783A CN 201810305705 A CN201810305705 A CN 201810305705A CN 110350783 A CN110350783 A CN 110350783A
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- diode
- capacitor
- switch circuit
- soft switch
- boost
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- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
Abstract
The invention discloses a kind of boost modules for UPS, it include: first, 2nd BOOST type FPC soft switch circuit, described first, the input terminal of 2nd BOOST type FPC soft switch circuit is separately connected the output end of rectification module, described first, the output end of 2nd BOOST type FPC soft switch circuit is separately connected the input terminal of inverter module, first, the control terminal of 2nd BOOST type FPC soft switch circuit is separately connected the GPIO mouth of dsp controller, described first, the topological structure of 2nd BOOST type FPC soft switch circuit is identical, the first BOOST type FPC soft switch circuit includes: inductance L31, L32, L33, capacitor C31, C32, C33, C34, C35, C36, resistance R31, R 32, R33, R34, diode D31, D32, D33, D34, D35, D36, D37, power tube IG31.This boost module completes complicated boosting and PFC process by the simple first, second BOOST type FPC soft switch circuit of structure, which can be used in UPS production, can greatly lower UPS complexity, reduce UPS cost of manufacture.
Description
Technical field
The present invention relates to switch power technology field, in particular to a kind of boost module for UPS.
Background technique
Uninterruptible power supply (UPS) is a kind of very important emergency service equipment in outside.When input alternating current interrupts,
UPS, which can be continued for a period of time, supplies electricity to other equipment such as office computer, enables us to have the sufficient time to go to be answered
It is right；Simultaneously when alternating current is abnormal, UPS can also effectively purify alternating current.Meanwhile uninterruptible power supply is as a kind of
Power electronic equipment, the inverter circuit with maintenance-free stored energy equipment and automatic control type also have analog circuit
And digital circuit.With the development of society, UPS, in factory, company, the even every field such as family have obtained widely answering
With the importance of UPS will obtain raising increasingly.
By the statistical data of Internet data center, because causing the failure of apparatus such as computer the problem of power supply, this ratio
Example accounts for about percent 45 or so.In addition, the power supply various kinds problem such as that there are also voltage transients is excessively high, input power-off, voltage ripple are excessive.
Simultaneously in China, the number that big city, medium-sized city and small city or villages and small towns averagely power off be respectively 0.5 time monthly, 2 times it is every
Month and 4 times monthly.From the above it can be seen that in order to solve the problems, such as power supply instability, a UPS is configured to external equipment, this
It is very important.In addition, these cannot all allow to have power-off for high-end communication apparatus and the high-end network equipment
It happens；The especially heart in a network, is to run using server as pith, such UPS, which just seems, more to be aggravated
It has wanted.Either common computer or expensive computer, with after a period of time, the file data in computer will seem
It is very valuable, so in order to prevent unexpected disappear of file data and configuring a uninterruptible power supply is necessary.
Existing UPS mostly uses greatly dsp controller as control chip, to control other function module, wherein
An important functional module of the boost module as UPS, input terminal connect the output end of rectification module, output end connection
Inverter module input terminal, control terminal connect dsp controller, and function is are as follows: first passes through self-rectifying in booster circuit future
The voltage waveform of module output is transformed into stable DC B US voltage, and second is made using PFC (PFC) circuit
Output current-voltage waveform is the reliable sinusoidal waveform of standard.
The boost module circuit structure of existing UPS is complicated, and cost of manufacture is high.
Summary of the invention
Technical problem solved by the present invention is the boost module circuit structure of existing UPS is complicated, cost of manufacture is high.
The solution that the present invention solves its technical problem is: a kind of boost module for UPS, comprising: first, second
The input terminal of BOOST type FPC soft switch circuit, the first, second BOOST type FPC soft switch circuit is separately connected rectification mould
The output end of the output end of block, the first, second BOOST type FPC soft switch circuit is separately connected the input of inverter module
End, the control terminal of the first, second BOOST type FPC soft switch circuit are separately connected the GPIO mouth of dsp controller, and described the
One, the topological structure of the 2nd BOOST type FPC soft switch circuit is identical, and the first BOOST type FPC soft switch circuit includes: inductance
L31, L32, L33, capacitor C31, C32, C33, C34, C35, C36, resistance R31, R32, R33, R34, diode D31, D32,
D33, D34, D35, D36, D37, one end of power tube IG31, the inductance L31 and the output end of rectification module connect, the electricity
The anode with diode D31, D32, one end of one end of inductance L32, L33, capacitor C31, C32 connect the other end of sense L31 respectively
It connects, the anode with diode D33, the cathode of diode D34 connect the other end of described capacitor C31, C32 respectively, two pole
One end with capacitor C33, C34, the cathode connection of diode D35, the anode of the diode D35 divide the anode of pipe D34 respectively
Not with the cathode of diode D36, the other end of inductance L32, L33, power tube IG31 source electrode connection, the power tube IG31's
Grid is connect with one end of resistance R31, R32, R33 respectively, and the other end of the resistance R31 is connect with the anode of diode D37,
The other end of the resistance R32 is connect with the cathode of diode D37, the GPIO of the anode and dsp controller of the diode D37
Mouthful connection, the cathode of diode D33 one end with capacitor C35, C36 respectively, one end of resistance R34, diode D31, D32
Cathode, inverter module input terminal connection, the other end of described resistance R33, R34, the drain electrode of power tube IG31, capacitor
The other end of C33, C34, C35, C36 are connect with neutral point respectively.
Further, the model CT60AM-20 of the power tube IG31.
Further, the capacitance of the capacitor C35 is 1000uF, and the capacitance of the capacitor C36 is 10uF.
The beneficial effects of the present invention are: the boost module of the invention passes through the simple first, second BOOST type of structure
FPC soft switch circuit completes complicated boosting and PFC process, which can be used in UPS production, can be big
Big attenuating UPS complexity reduces UPS cost of manufacture.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described.Obviously, described attached drawing is a part of the embodiments of the present invention, rather than is all implemented
Example, those skilled in the art without creative efforts, can also be obtained according to these attached drawings other designs
Scheme and attached drawing.
Fig. 1 is the connection block diagram of boost module；
Fig. 2 is the circuit connection diagram of boost module.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear
Chu is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair
Bright a part of the embodiment, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid
Other embodiments obtained, belong to the scope of protection of the invention under the premise of creative work.In addition, be previously mentioned in text
All connection/connection relationships not singly refer to that component directly connects, and referring to can be added deduct according to specific implementation situation by adding
Few couple auxiliary, Lai Zucheng more preferably coupling structure.Each technical characteristic in the invention, in not conflicting conflict
Under the premise of can be with combination of interactions.
Embodiment 1, with reference to Fig. 1 and Fig. 2, a kind of boost module for UPS, comprising: the first, second BOOST type FPC is soft
The input terminal of switching circuit 41,42, the first, second BOOST type FPC soft switch circuit 41,42 is separately connected rectification module
Output end+IN ,-IN, the output end of the first, second BOOST type FPC soft switch circuit 41,42 is separately connected inverter
The control terminal of input terminal+the BUS ,-BUS of module, the first, second BOOST type FPC soft switch circuit 41,42 are separately connected
GPIO mouth PWM1, PWM2 of dsp controller, the topological structure phase of the first, second BOOST type FPC soft switch circuit 41,42
Together, the first BOOST type FPC soft switch circuit 41 includes: inductance L31, L32, L33, capacitor C31, C32, C33, C34,
C35, C36, resistance R31, R32, R33, R34, diode D31, D32, D33, D34, D35, D36, D37, power tube IG31 are described
One end of inductance L31 and the output end+IN connection of rectification module, the other end of the inductance L31 respectively with diode D31, D32
Anode, one end of inductance L32, L33, capacitor C31, C32 one end connection, the other end of described capacitor C31, C32 respectively with
The anode of diode D33, diode D34 cathode connection, the diode D34 anode respectively with capacitor C33, C34 one
End, the cathode connection of diode D35, the positive cathode with diode D36 respectively of the diode D35, inductance L32, L33's
The other end, the source electrode connection of power tube IG31, the grid of the power tube IG31 connect with one end of resistance R31, R32, R33 respectively
It connects, the other end of the resistance R31 is connect with the anode of diode D37, and the other end of the resistance R32 is with diode D37's
The anode of cathode connection, the diode D37 is connect with the GPIO of dsp controller mouth PWM1, the cathode point of the diode D33
Not with one end of capacitor C35, C36, one end of resistance R34, the cathode of diode D31, D32, the input terminal of inverter module+
BUS connection, the other end of described resistance R33, R34, the drain electrode of power tube IG31, the other end of capacitor C33, C34, C35, C36
It is connect respectively with neutral point n.
Since the working principle of the first, second BOOST type FPC soft switch circuit 41,42 is identical, below with the first BOOST
The working principle of type FPC soft switch circuit 41 is described.
The inductance L31, diode D31, D32, power tube IG31, capacitor C35, C36, resistance R34 are formed typically
BOOST type boost configuration, PWM1 mouthfuls of generation PWM waves of GPIO mouth of the dsp controller, the PWM wave are applied to power tube IG31
On, when power tube IG31 is switched on, the output end+IN of rectification module charges to inductance L31, and electricity is flowed through in charging process
The electric current for feeling L31 is generally stable in definite value；Simultaneously with this, capacitor C35, C36 supplies electricity to resistance R34, forms output voltage, output
Voltage is transported to the input terminal+BUS of inverter module, completes boost process.
Below it is the PFC Sofe Switch process of the first BOOST type FPC soft switch circuit 41:
When IG31 conducting, due to the presence of L32 and L333, IG31 no-voltage is open-minded.It is electric in inductance L32 and inductance L33
Stream increases, in two sub-sections:
First part: the shunting of inductance L32 and inductance L33, when inductance L32 and inductance L33 are connected, diode D31 and
Voltage on the left of diode D32 is very high.Inductance L32 and inductance L33 excitation at this time, electric current rise.
Second part: since capacitor C31 and capacitor C32 both end voltage are close to 0, as capacitor C31 and the left side capacitor C32 voltage
When reduction, by diode D34, capacitor C31 and capacitor C32, inductance L32 and inductance L33 are put by capacitor C33 and capacitor C34
Electricity, energy transfer in capacitor C33 and inductance C34 to capacitor C31, C32, in inductance L32, L33.
In this process, capacitor C31, C32 charges, inductance L32, L33 accumulation of energy, when inductance L32, L33 electric current reaches stream
When value through inductance L31, the electric current of diode D31, D32 drop to 0, realize soft switching.
(2) when IGBT1 is turned off, the energy of inductance L32, L33 charges to capacitor C33, C34, inductance L31 to capacitor C31,
C32 electric discharge.The energy of capacitor C31, C32 are squeezed into the input terminal+BUS of inverter module.When the voltage of capacitor C31, C32 are close
When 0, diode D31, D32 conducting.The energy of capacitor C33, C34 go to capacitor C31, C32 when next power tube IG31 is connected
With inductance L32, L33.
PFC is completed by above-mentioned simple PFC Sofe Switch, meets UPS requirement.
The boost module of the invention passes through the simple first, second BOOST type FPC soft switch circuit 41,42 of structure
Complicated boosting and PFC process are completed, which can be used in UPS production, and it is multiple can greatly to lower UPS
Miscellaneous degree reduces UPS cost of manufacture.
As advanced optimizing for above embodiment, the model CT60AM-20 of the power tube IG31.
As advanced optimizing for above embodiment, the capacitance of the capacitor C35 is 1000uF, the capacitor C36's
Capacitance is 10uF.By the combination of small one and large one two kinds of capacitors, the harmonic wave of boost module output can be reduced.
Better embodiment of the invention is illustrated above, but the invention is not limited to the implementation
Example, those skilled in the art can also make various equivalent modifications on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.
Claims (3)
1. a kind of boost module for UPS characterized by comprising the first, second BOOST type FPC soft switch circuit, institute
The input terminal for stating the first, second BOOST type FPC soft switch circuit is separately connected the output end of rectification module, and described first, second
The output end of BOOST type FPC soft switch circuit is separately connected the input terminal of inverter module, the first, second BOOST type
The control terminal of FPC soft switch circuit is separately connected the GPIO mouth of dsp controller, the first, second BOOST type FPC Sofe Switch
The topological structure of circuit is identical, and the first BOOST type FPC soft switch circuit includes: inductance L31, L32, L33, capacitor C31, C32,
C33, C34, C35, C36, resistance R31, R32, R33, R34, diode D31, D32, D33, D34, D35, D36, D37, power tube
The output end of one end of IG31, the inductance L31 and rectification module connects, the other end of the inductance L31 respectively with diode
The anode of D31, D32, one end of inductance L32, L33, one end connection of capacitor C31, C32, the other end of described capacitor C31, C32
Respectively with the anode of diode D33, the cathode of diode D34 connected, the anode of the diode D34 respectively with capacitor C33,
One end of C34, the cathode connection of diode D35, the positive cathode with diode D36 respectively of the diode D35, inductance
The other end of L32, L33, power tube IG31 source electrode connection, the grid of the power tube IG31 respectively with resistance R31, R32,
One end of R33 connects, and the other end of the resistance R31 is connect with the anode of diode D37, the other end of the resistance R32 and
The cathode of diode D37 connects, and the anode of the diode D37 is connect with the GPIO of dsp controller mouth, the diode D33
Cathode one end with capacitor C35, C36 respectively, one end of resistance R34, the cathode of diode D31, D32, inverter module
Input terminal connection, the other end of described resistance R33, R34, the drain electrode of power tube IG31, capacitor C33, C34, C35, C36's is another
End is connect with neutral point respectively.
2. a kind of boost module for UPS according to claim 1, it is characterised in that: the type of the power tube IG31
Number be CT60AM-20.
3. a kind of boost module for UPS according to claim 1 or 2, it is characterised in that: the appearance of the capacitor C35
Value is 1000uF, and the capacitance of the capacitor C36 is 10uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810305705.2A CN110350783A (en) | 2018-04-08 | 2018-04-08 | A kind of boost module for UPS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810305705.2A CN110350783A (en) | 2018-04-08 | 2018-04-08 | A kind of boost module for UPS |
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| Publication Number | Publication Date |
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| CN110350783A true CN110350783A (en) | 2019-10-18 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810305705.2A Pending CN110350783A (en) | 2018-04-08 | 2018-04-08 | A kind of boost module for UPS |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5633793A (en) * | 1995-01-23 | 1997-05-27 | Center For Innovative Technology | Soft switched three-phase boost rectifiers and voltage source inverters |
| CN1202759A (en) * | 1998-05-13 | 1998-12-23 | 深圳市华为通信股份有限公司 | Soft switch circuit topology for power conversion |
| US5959438A (en) * | 1998-01-09 | 1999-09-28 | Delta Electronics, Inc. | Soft-switched boost converter with isolated active snubber |
| JP2000125556A (en) * | 1998-10-14 | 2000-04-28 | Sony Corp | Voltage-resonance type switching power supply circuit |
| CN1278120A (en) * | 2000-05-17 | 2000-12-27 | 深圳市华为电气技术有限公司 | Soft switch topology circuit for step-up/step-down voltage conversion |
| US20050024023A1 (en) * | 2003-07-28 | 2005-02-03 | Delta-Electronics Inc. | Soft-switching three-phase power factor correction converter |
| US20080002444A1 (en) * | 2006-06-30 | 2008-01-03 | Sampat Shekhawat | High-efficiency power converter system |
| US20110309817A1 (en) * | 2010-06-16 | 2011-12-22 | Jae-Jung Yun | Dc-dc boost converter circuit and method for driving the same |
| CN105720855A (en) * | 2016-04-04 | 2016-06-29 | 中国科学院地质与地球物理研究所 | Electromagnetic field transmitter and zero-voltage switching soft switch system thereof |
| CN105720817A (en) * | 2016-04-25 | 2016-06-29 | 佛山市新光宏锐电源设备有限公司 | PFC soft switching circuit of BOOST circuit |
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-
2018
- 2018-04-08 CN CN201810305705.2A patent/CN110350783A/en active Pending
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| US5959438A (en) * | 1998-01-09 | 1999-09-28 | Delta Electronics, Inc. | Soft-switched boost converter with isolated active snubber |
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| JP2000125556A (en) * | 1998-10-14 | 2000-04-28 | Sony Corp | Voltage-resonance type switching power supply circuit |
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