CN105450034B - A kind of chain type doube bridge self-coupling voltage reducing topology - Google Patents
A kind of chain type doube bridge self-coupling voltage reducing topology Download PDFInfo
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- CN105450034B CN105450034B CN201610009495.3A CN201610009495A CN105450034B CN 105450034 B CN105450034 B CN 105450034B CN 201610009495 A CN201610009495 A CN 201610009495A CN 105450034 B CN105450034 B CN 105450034B
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- 238000010168 coupling process Methods 0.000 title claims abstract description 36
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 33
- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000004146 energy storage Methods 0.000 claims description 10
- 230000006837 decompression Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000010287 polarization Effects 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 230000005404 monopole Effects 0.000 claims 1
- 230000009467 reduction Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000000696 magnetic material Substances 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- 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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of completely new circuit topology, specially a kind of chain type doube bridge self-coupling voltage reducing topology solves the drawback that traditional step down DC converter output power is low, volume is big, low efficiency, reliability are low.This technology is staggeredly driven using two-tube, and output power can promote one times.High frequency transformer is designed as non-coupling " chain type " structure, eliminates the loss of power of coupling transform, improves efficiency.This technology realizes voltage dropping power supply under the requirement of equal-wattage and electric parameter, and volume reduces 50%, and output power increases one times, and efficiency improves 10%, and efficiency highest can achieve 96%.
Description
Technical field
The present invention relates to positive output buck formula DC converters.
Background technique
The circuit of domestic and international step-down switching power supply is there are commonly BOOST reduction voltage circuit and based on the reduction voltage circuit of flyback at present
Topology etc..
The main circuit diagram of BOOST reduction voltage circuit is as shown in Figure 1, working principle is: input power passes through power switch tube (Q)
On-off be superimposed by energy storage inductor (L) energy storage and with input voltage after through fast restore isolating diode (D) pass to output capacitance
(C), pressure reduction is completed.
Based on flyback buck topology main circuit diagram as shown in Fig. 2, when switching tube (Q) conducting, the primary coil of transformer B
Energy storage, when switching tube cut-off, primary energy is coupled to secondary through high frequency transformer again, is designed by the primary and secondary turn ratio, realizes drop
Press through journey.High frequency transformer has energy loss in primary and secondary coupling process, can reduce overall efficiency.
Either BOOST reduction voltage circuit or flyback topologies the reduction voltage circuit circuit structure that is all single branch power tube, even if
Be can use more power tube parallel connection form, but due between parallel power pipe flowing and power tube itself positive temperature
The factors such as coefficient feature are different, are difficult to expand power in actual use, thus the usual maximum of both circuits can only export it is several
The power of hectowatt, it is difficult to meet the needs of market is to high-power voltage dropping power supply.
Both by carrying out energy transmission again after primary inductance energy storage, magnetic material and magnetic permeability etc. at present
Limitation, so that the magnetic material size of energy storage inductor and flyback transformer is larger, magnetic material utilization rate is lower, and overall power density is lower,
Product easily occurs magnetic material when the limit is applied and is saturated and leads to circuit damaged condition.
Summary of the invention
At home and abroad field of switch power creates a kind of completely new circuit topology to the present invention, solves traditional buck
The drawbacks of output power of DC converter is low, volume is big, fault mode harm load.
This technology realizes voltage dropping power supply under the requirement of equal-wattage and electric parameter, and volume reduces 50%, output work
Rate increases one times, and efficiency improves 10%, and efficiency highest can achieve 96%, and fault mode will not make to load overvoltage.
" chain type doube bridge self-coupling voltage reducing topology " creates " staggeredly increasing power drive each other ", " no couples high frequency chain type decompression
The completely new circuit topology of transformer ".The functional block diagram such as Fig. 3 of " chain type doube bridge self-coupling voltage reducing topology ".
In Fig. 3: chain type doube bridge self-coupling voltage reducing topological circuit, by four power switch metal-oxide-semiconductors Q1, Q2, Q3, Q4, a nothing
Couples high frequency chain type forward direction step-up transformer B, resonant inductance a L1, secondary commutation circuit D1, a D2, an output filtering
Inductance L2 and an output filter capacitor C2 are constituted；The junction capacity and L2 of power switch metal-oxide-semiconductor Q1, Q2, Q3, Q4 are as resonance
Four switching tubes are connected once under no-voltage in element, realize fixed frequency soft switch.Q1, Q2 constitute leading arm, and Q3, Q4 are constituted
Lagging leg.Bridge arm direct pass short circuit in order to prevent, Q1 and Q2, artificial addition Power MOSFET between Q3 and Q4, it is basis
The principle that delay and shutdown are not delayed is opened same bridge arm dead time is arranged.
In the schematic diagram of the topology, " staggeredly increasing power drive each other " establishes the two-tube driving structure of high-power output,
Every in a manner of being staggeredly connected switching tube duty ratio is 50%, this circuit topological structure opens up output power than single-tube circuit
The output power flutterred improves one times.
" no couples high frequency chain type step-down transformer " breaches traditional design, directly will be current according to electromagnetic induction principle
Traditional two coil heights of primary and secondary are integrated into the decompression energy " chain " with symmetrical structure." chain " formula high frequency is depressured to become
Depressor feature is to save one group of coil, integrates and has shared primary coil, can be to greatest extent by prime power through being depressured
After be transferred to output end." no couples high frequency chain type step-down transformer ", which changes current conventional highfrequency transformer, needs primary and secondary to couple
Carry out energy exchange.It by the design with great concentration of many years, produces and compares, be somebody's turn to do " chain " formula and integrate high frequency transformer, efficiency of transmission
It is at home and abroad highest in high frequency transformer field, and saves copper wire used in coil, reduces the volume and materials of magnetic material.
The course of work of " chain type doube bridge self-coupling voltage reducing topology " topological circuit is told about below:
1, when Q1, Q4 are connected, Q2, Q3 cut-off, no couples high frequency chain type step-up transformer B voltage is Vin, and power is by transformation
Device B primary side is transmitted to load, and D1, D3 conducting, L2, C2 are energy storage filter element, while providing output voltage, output voltage=K*
D*Vin, (K: turn ratio；D: duty ratio；Vin: input direct-current voltage) due to turn ratio K < 1, output voltage relatively inputs electricity
It forces down.
2, when Q1, Q4 end, Q2, Q3 conducting, no couples high frequency chain type step-up transformer B voltage is Vin, and power is by transformation
Device B primary side is transmitted to load, and D2, D4 conducting filter for L2, C2 energy storage, provides output voltage.
The above process successively converts, and high frequency transformer staggeredly drives bipolarity magnetic polarization to work with Q1, Q4, Q2, Q3
To provide boost voltage value for output.
3, Q1 and Q2, artificial addition Power MOSFET between Q3 and Q4, it is that basis opens delay and shutdown is not prolonged
When principle same bridge arm dead time is set.
" chain type doube bridge self-coupling voltage reducing topology " feature:
Hoisting power:
Two-tube driving, i.e. two power tubes staggeredly work, and the duty ratio of every power tube nearly 50%, power is able to ascend one
Times.The model machine developed, separate unit output power easily realize 3KW, and " GB/T 17478-2004 is straight for output parameters satisfaction
The requirement of the performance characteristics of galvanic electricity source device ".
Output electric property can be excellent:
Through repeatedly calculating and verification experimental verification, it is two-tube staggeredly driving design method, make circuit in the circuit course of work
Output voltage waveforms can be full symmetric, and under identical frequency state, output transient response speed is high, the output electricity after decompression
Pressure and current regulation are respectively less than 0.5%.
High power density:
Two-tube staggeredly driving makes high frequency transformer magnetic core in III working condition, and high frequency transformer belongs to bipolarity magnetic polarization,
Magnetic induction variation range is twice or more of unipolarity magnetic polarization, and magnetic core utilization rate is high, and core volume only needs the electricity such as above-mentioned flyback
The half of magnetic core used in road.Fig. 9 is the comparison with transformer when power output, and left side is greatly transformation used in flyback topology circuit
Device, small right side is " chain type doube bridge self-coupling voltage reducing topology " topological circuit house transformer, it is seen that the two size differs one times,
" chain type high-power decompression DC converter technique " has the characteristics that high power density.
" no couples high frequency chain type step-down transformer " improves transfer efficiency:
High frequency transformer is designed as non-coupling " chain type " structure, eliminates the first of current conventional topology structure high frequency transformer
The loss of power of coupling process between secondary improves the transfer efficiency of transformer, and efficiency improves 10%, and efficiency highest can achieve
96%.This no coupling " chain type " structure of high frequency transformer simultaneously, it is voltage averaged to fit over according to electromagnetic induction principle
Inside winding, the unfavorable factor of coupling is thoroughly eliminated, realizes power rows in the industry for input and output with " very big to become
Than " require decompression DC converting power source, still have very efficient ideal, it is energy saving.
" no couples high frequency chain type step-down transformer " production technology is easy to control:
" chain type doube bridge self-coupling voltage reducing topology " design is succinct, novel, directly by two coil collection of primary and secondary traditional at present
At together, so that transformer winding is easier.
The technique for coiling of conventional topology structure high frequency transformer is complicated at present, in order to increase the coupling between coil, usually not
It obtains and does not use complicated " sandwich " winding, coil utilization rate reduces, and technology controlling and process consistency is poor.
Non-coupling " chain type " structure improves input voltage to desirable value completely by the turn ratio of high frequency transformer,
The wire winding of " Double-wire parallel wound " and " tap output " is needed in winded coil of transformer, and magnetic core does not need out gas
Gap, production technology are easier to control, and Fig. 9 is high frequency transformer coiling comparison chart.
The utility model has the advantages that
At home and abroad field of switch power creates a kind of completely new circuit topology to the present invention, solves traditional buck
The drawback that DC converter output power is low, volume is big, low efficiency, reliability are low.
Improve the output power of reduction voltage circuit, output electric property can it is excellent, with high power density, " no coupling height
Frequency chain type step-down transformer " improves transfer efficiency, production technology is easy to control.
This technology realizes voltage dropping power supply under the requirement of equal-wattage and electric parameter, and volume reduces 50%, and efficiency mentions
High by 10%, efficiency highest can achieve 96%.The invention wide market mainly includes vehicle-mounted decompression transformation, laser powered sensor
Power supply, electrostatic precipitation, LED illumination, solar energy power generating, field of wind power generation.
Extension topology on the basis of the technical program
The output rectification effective metal-oxide-semiconductor of second level is expanded into secondary synchronization rectification circuit, wiring on the basis of the technical program
Figure is shown in Figure 10, and P1, P2 are metal-oxide-semiconductor in figure, instead of original rectifying tube D1, D2, realizes synchronous rectification.
Detailed description of the invention
Fig. 1 BOOST reduction voltage circuit；
Fig. 2 flyback reduction voltage circuit；
Fig. 3 " chain type doube bridge self-coupling voltage reducing topology " circuit diagram；
Fig. 4 " chain type doube bridge self-coupling voltage reducing topology " voltage waveform one；
Fig. 5 " chain type doube bridge self-coupling voltage reducing topology " voltage waveform two；
Fig. 6 " chain type doube bridge self-coupling voltage reducing topology " Q1 and Q2 driver' s timing figure；
Fig. 7 " chain type doube bridge self-coupling voltage reducing topology " controlling dead error waveform；
Fig. 8 a high frequency transformer routine sandwich is around drawing；
Fig. 8 b " chain type doube bridge self-coupling voltage reducing topology " transformer winding figure；
Fig. 9 " chain type doube bridge self-coupling voltage reducing topology " extends topological diagram；
Figure 10 " chain type doube bridge self-coupling voltage reducing topology " DC280V is depressured DC28V example principles figure
Specific embodiment
Application in decompression transformation field:
Power supply is generally DC280V, and many powerful electronic equipments need to provide the voltage of DC28V, original circuit shape
Its output power of formula is 0-600W, but output power can be promoted to 3000W using " chain type doube bridge self-coupling voltage reducing topology ", and
And it is small in size, light-weight, more suitable for use environment.
For the topological form of circuit using " chain type doube bridge self-coupling voltage reducing topology ", circuit main transformer B has selected EE55 magnetic core,
Q1, Q2, Q3, Q4 select C2M0160120D, and D1, D2 select MUR3020.Working frequency is set as 280KHz, main transformer B
Using Double-wire parallel wound tap lead-out mode as shown in Figure 10, output power 3000W, efficiency by inputoutput test 96.2%.
Finally, it should be noted that obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
The obvious changes or variations that Shen goes out are still in the protection scope of this invention.
Claims (1)
1. a kind of chain type doube bridge self-coupling voltage reducing topology, it is characterised in that: the buck topology includes staggeredly increasing power drive each other
With no couples high frequency chain type step-down transformer；
The power drive that staggeredly increases each other is to establish the two-tube driving structure of high-power output, every in a manner of being staggeredly connected
Branch switching tube duty ratio is 0-50%, this circuit topological structure promotes output power than the output power of single-tube circuit topology
One times, no couples high frequency chain type step-down transformer is set to work in bipolarity magnetic polarization mode, magnetic induction variation range is monopole
Property twice or more of magnetic polarization, magnetic core utilization rate is high, and core volume only needs the half of magnetic core used in above-mentioned unipolarity circuit；
The no couples high frequency chain type step-down transformer is to eliminate current conventional topology structure and be depressured without couples high frequency chain type to become
The loss of power of coupling process between the primary and secondary of depressor improves the transfer efficiency of transformer, while non-coupling " chain type " is tied
Structure improves input voltage to desirable value, completely by the turn ratio of no couples high frequency chain type step-down transformer using " two-wire
And around " and " tap output " wire winding, production technology is easier to control；
The chain type doube bridge self-coupling voltage reducing topology, by four power switch metal-oxide-semiconductors Q1, Q2, Q3, Q4, one without couples high frequency chain
Formula step-down transformer, a resonant inductance L1, secondary commutation circuit D1, a D2, an output inductor L2 and one it is defeated
Filter capacitor C2 is constituted out；The junction capacity and L2 of power switch metal-oxide-semiconductor Q1, Q2, Q3, Q4 make four switches as resonant element
Pipe is once connected under no-voltage, realizes that fixed frequency soft switch, Q1, Q2 constitute leading arm, and Q3, Q4 constitute lagging leg, when Q1, Q4 are cut
Only, Q2, Q3 are connected, and no couples high frequency chain type step-down transformer voltage is Vin, and power is transmitted to load by transformer B primary side,
D2 conducting, filters for L2, C2 energy storage, provides output voltage；The above process successively converts, no couples high frequency chain type step-down transformer
Bipolarity magnetic polarization work is staggeredly driven with Q1, Q4, Q2, Q3, it can provide step-down voltage value for output；Metal-oxide-semiconductor Q1, Q2,
Q3, Q4 form full-bridge circuit, and the drain electrode of Q1 and Q3 drain electrode connect input anode, and the source electrode of Q1 connects with the drain electrode of Q2 connects transformer
Primary it is first, the drain electrode of the source electrode and Q4 of Q3 connects the primary tail of transformer, and the source electrode of Q2 and the source electrode of Q4 connect input cathode, be
Prevent bridge arm direct pass short-circuit, Q1 and Q2, artificial addition Power MOSFET between Q3 and Q4, it be according to open delay and
The principle that is not delayed is turned off same bridge arm dead time is arranged；
Chain type doube bridge self-coupling voltage reducing topology specifically,
(1) when Q1, Q4 are connected, Q2, Q3 cut-off, no couples high frequency chain type step-down transformer voltage is Vin, and power is by transformer B
Primary side is transmitted to load, and D1 conducting, L2, C2 are energy storage filter element, while providing output voltage, output voltage=K*D*Vin,
K is turn ratio；D is duty ratio；Vin: input direct-current voltage；Due to turn ratio K < 1, output voltage is low compared with input voltage；
(2) when Q1, Q4 end, Q2, Q3 conducting, no couples high frequency chain type step-down transformer voltage is Vin, and power is by transformer B
Primary side is transmitted to load, and D2 conducting filters for L2, C2 energy storage, provides output voltage；The above process successively converts, and no coupling is high
Frequency chain type step-down transformer staggeredly drives bipolarity magnetic polarization work with Q1, Q4, Q2, Q3, it can provides decompression electricity for output
Pressure value；
(3) Q1 and Q2, artificial addition Power MOSFET between Q3 and Q4, it according to open delay and shutdown be not delayed
Principle is arranged same bridge arm dead time.
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| CN105450034B true CN105450034B (en) | 2018-12-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147886A (en) * | 1999-05-15 | 2000-11-14 | Technical Witts, Inc. | Dual opposed interleaved coupled inductor soft switching converters |
| CN202019303U (en) * | 2011-05-06 | 2011-10-26 | 江苏省电力公司扬州供电公司 | Switching power supply |
| CN103259410A (en) * | 2013-05-20 | 2013-08-21 | 航天长峰朝阳电源有限公司 | Chain type high-power voltage-reducing direct-current converter and control method thereof |
| CN203261132U (en) * | 2013-05-07 | 2013-10-30 | 南京邮电大学 | Wireless power supply device employing fundamental wave magnetic coupling resonance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6538905B2 (en) * | 2000-04-04 | 2003-03-25 | Artesyn Technologies, Inc. | DC-to-DC power converter including at least two cascaded power conversion stages |
-
2016
- 2016-01-06 CN CN201610009495.3A patent/CN105450034B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147886A (en) * | 1999-05-15 | 2000-11-14 | Technical Witts, Inc. | Dual opposed interleaved coupled inductor soft switching converters |
| CN202019303U (en) * | 2011-05-06 | 2011-10-26 | 江苏省电力公司扬州供电公司 | Switching power supply |
| CN203261132U (en) * | 2013-05-07 | 2013-10-30 | 南京邮电大学 | Wireless power supply device employing fundamental wave magnetic coupling resonance |
| CN103259410A (en) * | 2013-05-20 | 2013-08-21 | 航天长峰朝阳电源有限公司 | Chain type high-power voltage-reducing direct-current converter and control method thereof |
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