CN102684511A - Wide-input voltage range arc power-supply device - Google Patents
Wide-input voltage range arc power-supply device Download PDFInfo
- Publication number
- CN102684511A CN102684511A CN2012101761674A CN201210176167A CN102684511A CN 102684511 A CN102684511 A CN 102684511A CN 2012101761674 A CN2012101761674 A CN 2012101761674A CN 201210176167 A CN201210176167 A CN 201210176167A CN 102684511 A CN102684511 A CN 102684511A
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- arc power
- power equipment
- voltage range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a wide-input voltage range arc power-supply device. A wide-range commercial power voltage is divided into a low-voltage module voltage, a medium-voltage module voltage and a high-voltage module voltage after rectified, filtered and stabilized, the low-voltage module voltage is boosted and the high-voltage module voltage is bucked as well as the medium-voltage module voltage is directly connected by a booster chopper circuit and a cascade voltage-reducing chopper, and then the low-voltage module voltage, the medium-voltage module voltage and the high-voltage module voltage are inverted by one group of inverters for obtaining the single voltage value with the required frequency so as to be used by an inversion type electric welder, and the single voltage value can be connected with the single-phase/three-phase power supply voltage, thus the flexibility is stronger.
Description
Technical field
the present invention relates to the arc power field, particularly a kind of applicable arc power equipment than wide-voltage range.
Background technology
at present the voltage range of the commercial ac power source of countries in the world be 110V to 575V, concrete data are: 110V, 115V, 200V, 208V, 220V, 230V, 240V, 380V, 400V, 410V, 440V, 460V, 575V.As adapting to so wide voltage range, need suitable circuit topological structure and accomplish through refuting the arc power equipment that connects commercial ac power source acquisition electric energy.Known method and circuit topological structure have two kinds at present:
first kind of known method and circuit topological structure (see figure 1) are: the voltage of the commercial ac power source of countries in the world is divided into three groups, low pressure group: 200V, 208V, 220V, 230V and 240V; High pressure group: 380V, 400V, 410V, 440V, 460V and individual voltage 575V, the voltage of two groups of commercial ac power sources is arranged: 110V and 115V fail included.
for low pressure group voltage, this circuit adopts the topological structure of two groups of inverter parallel connections; For high pressure group voltage, this circuit adopts the topological structure of two groups of inverter series connection; For individual voltage 575V, this circuit also installs series connection buck chopper device circuit additional (hereinafter referred to as: topological structure BUCK series connection chopping depressuring device) before inverter except that adopting two groups of inverter series connection.The voltage range of the countries in the world commercial ac power source that this method is suitable for is that 200V is to 575V.The voltage range that this known method and circuit topological structure are suitable for does not comprise 110V and 115V, and can only be used for the three phase supply mode.
second kind of known method and circuit topological structure (see figure 2) are: the voltage of the commercial ac power source of countries in the world is divided into three groups, 100V magnitude group: 110V and 115V; 200V magnitude group: 200V, 208V, 220V, 230V and 240V; 400V magnitude group: the independent power pack of 380V, 400V, 410V, 440V, 460V and 575V.
for 100V magnitude group voltage, this circuit adopts full wave and voltage doubling rectification and single group inverter topology; For 200V magnitude group voltage, this circuit adopts full-wave rectification and single group inverter topology; For 400V magnitude group and 575V supply voltage, this circuit is except that adopting full-wave rectification and single topological structure that also before inverter, installs BUCK series connection chopping depressuring device the inverter topology additional of organizing.Though this known method and circuit topological structure are suitable for the source power supply voltage range of various countries, the whole world, can only be applicable to single phase power supply.
Summary of the invention
For overcoming above-mentioned defective, the object of the invention promptly is to provide a kind of order/three phase supply of refuting
, and the arc power equipment of suitable various countries source power supply voltage range.
The objective of the invention is to realize through following technical scheme:
A kind of wide input voltage range arc power equipment of the present invention mainly comprises: list/three phase rectifier filter circuit, control circuit voltage stabilizing power supply; Compare decision circuitry, transducer control module, voltage detection module; Single group inverter topology, inverter control circuit; Said wide input voltage range arc power equipment also comprises parallel connection boosting chopper circuit and series connection buck chopper device circuit; Said parallel connection boosting chopper circuit and series connection buck chopper device circuit are organized inverter topology UNICOM with transducer control module and list simultaneously;
Wherein: said list/three phase rectifier filter circuit carries out rectifying and wave-filtering to input supply voltage;
The voltage of said control circuit voltage stabilizing power supply after to list/three phase rectifier filter circuit rectifying and wave-filtering carries out voltage stabilizing;
Said relatively decision circuitry judges that the direct voltage after the voltage stabilizing is low-voltage group voltage, middle voltage group voltage or high voltage group voltage;
Said transducer control module receives the relatively judged result of decision circuitry, and then control parallel connection boosting chopper circuit and the series connection buck chopper device circuit direct voltage after to voltage stabilizing selects to carry out PWM boost voltage stabilizing pattern, direct mode operation or PWM lowering and stabilizing blood pressure pattern;
Said voltage detection module is carried out feedback regulation control to the voltage of parallel connection boosting chopper circuit and the output of series connection buck chopper device circuit;
Said single group inverter topology converts the magnitude of voltage of required frequency into to the direct voltage of parallel connection boosting chopper circuit and the output of series connection buck chopper device circuit;
said inverter control circuit carries out FEEDBACK CONTROL through the voltage of this wide input voltage range arc power equipment output to single group inverter topology.
as a kind of improvement of the present invention, and said parallel connection boosting chopper circuit and series connection buck chopper device circuit be by power semiconductor switches Q1, Q2, diode D7, D8, and inductance L 1 and capacitor C 2 constitute.
As further improvement of the present invention, said list/three phase rectifier filter circuit is made up of list/three-phase bridge rectification bridge and the filter capacitor C1 parallelly connected with it
.
Further improve as of the present invention
, and said relatively decision circuitry is by divider resistance R1, R2, comparator U1, U2, U3, and reference voltage V 1, V2, V3 and voltage range judge module constitute.
On the basis of said structure, said single group inverter topology is made up of inverter circuit, transformer T1, diode D9, D10 and inductance L 2; Wherein:
Said inverter circuit is the full-bridge inverting pattern of being made up of power semiconductor switches Q3, Q4, Q5, Q6;
Said inverter circuit also can be the semi-bridge inversion pattern of being made up of power semiconductor switches Q9, Q10 and capacitor C 5, C6;
said inverter circuit can also be the single-end ortho-exciting inverter mode of being made up of power semiconductor switches Q13, Q14 and diode D29, D30.
as of the present invention preferred embodiment a kind of, said low-voltage group voltage is 110V, 115V, 200V, 208V, 220V, 230V and 240V; Middle voltage group voltage is 380V, 400V, 410V, 440V, 460V; High voltage group voltage is 575V.
As another preferred embodiment of the present invention, said wide input voltage range arc power equipment also comprises the air switch that is connected with current rectifying and wave filtering circuit
.
The wide input voltage range arc power equipment of this kind structure is adopted in
; The source power supply voltage of wide region is passed through rectifying and wave-filtering, be divided into low-voltage group voltage, middle voltage group voltage and high voltage group voltage after the voltage stabilizing, low-voltage group voltage is boosted by parallel connection boosting chopper circuit and series connection buck chopper device circuit; High voltage group voltage is carried out step-down; After centering voltage group voltage carries out direct mode operation, carry out the single magnitude of voltage that inversion obtains required frequency through single group inverter topology again, with the use of supply contravariant arc welding machine; And can refute order/three-phase mains voltage, flexibility is stronger.
Description of drawings
In order to be easy to explanation, the present invention is described in detail by following embodiment and accompanying drawing
.
Fig. 1 is the structure principle chart of first kind of existing device of arc of the present invention;
Fig. 2 is the structure principle chart of second kind of existing device of arc of the present invention;
Fig. 3 is the circuit theory diagrams of first kind of execution mode of a kind of wide input voltage range arc power of the present invention equipment;
Fig. 4 is the circuit theory diagrams of second kind of execution mode of a kind of wide input voltage range arc power of the present invention equipment;
Fig. 5 is the circuit theory diagrams of the third execution mode of a kind of wide input voltage range arc power of the present invention equipment.
Embodiment
in order to make the object of the invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and execution mode, are further elaborated to the present invention.Should be appreciated that embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
see also Fig. 3-5, and the present invention is divided into three groups, low pressure group group: 110V, 115V, 200V, 208V, 220V, 230V and 240V with the voltage of the commercial ac power source of countries in the world; Middle pressure group: 380V, 400V, 410V, 440V, 460V; High pressure group: 575V.
Fig. 3 is seen in
, and for low pressure group voltage, this circuit adopts list/three-phase bridge rectification cascade parallel connection BOOST copped wave booster circuit (being the parallel connection boosting chopper circuit) and single group inverter topology; For middle pressure group voltage, this circuit adopts list/three-phase bridge rectification and single group inverter topology; For high pressure group supply voltage, this circuit adopts list/three-phase bridge rectification cascade buck chopper device circuit to become the device topological structure with single group.Method and circuits topological structure of the present invention is suitable for the commercial power voltage range of various countries, the whole world, can not only be used for the three phase supply mode and also can be used for the single phase power supply mode.Its concrete implementation method is following:
1. commercial electric energy through electric power incoming line a, b, three of c or wherein two power lines introduce these equipment; Deliver to the rectifier bridge rectification through air switch S1; Store voltages after the rectification is on capacitor C1; The C1 filtering a large amount of ripples after the rectification, make that the voltage on the capacitor C1 is steady basically.
. the direct voltage after the rectification is through divider resistance R1, R2 sampling; Compare through comparator U1, U2, U3 and reference voltage V 1, V2, V3; Draw comparative result, judge that by logic judgment unit U5 the source power supply voltage of this equipment of input belongs to the low pressure group group of our regulation: 110V, 115V, 200V, 208V, 220V, 230V and 240V; Which voltage range of middle pressure group: 380V, 400V, 410V, 440V, 460V and high pressure group: 575V, thus switching controller U6 informed.
. switching controller U6 confirms that main circuit is to adopt the voltage stabilizing pattern of boosting after learning voltage range, and the logical pattern of unstable straightening still is the lowering and stabilizing blood pressure pattern.Except that direct mode operation, boost with decompression mode all can adopt PWM switch voltage-stabilizing pattern, all can introduce this circuit output voltage feedback signal and carry out the voltage stabilizing feedback regulation control.
. the PWM switch voltage-stabilizing pattern with decompression mode of boosting; The capital is introduced this circuit output voltage feedback signal and is carried out the voltage stabilizing feedback regulation control; Voltage feedback signal is responsible for acquisition process by U5; The error ratio that voltage signal processed is sent switching controller U6, amplification, adjusting and PWM modulating unit, switching controller U6 can see the following form according to the commercial voltage output control signal of this equipment of input.
| Line voltage | The Q1 operating state | The Q2 operating state |
| 110V is to 240V | Conducting | PWM switch (BOOST boosts) |
| 380V is to 460V | Conducting | End |
| More than the 575V | PWM switch (BUCK step-down) | End |
.U8 is the control circuit voltage stabilizing power supply of this equipment, it with rectification after line voltage convert the stable DC voltage that control circuit needs to, be the The whole control circuit supply.
the present invention can be so that contravariant arc welding machine can adapt to the voltage of global commerce electrical network; Through actual samples test commercial power grid voltage; And judge its electric pressure scope of living in; Making main circuit is to adopt the voltage stabilizing pattern of boosting; The logical pattern of unstable straightening still is three kinds of circuit topology forms such as lowering and stabilizing blood pressure pattern, makes that the input voltage of inverter section is a more stable direct voltage all the time, thereby makes whole contravariant arc welding machine can be applicable to the global commercial electrical network of (50 to 60 hz) voltage range from 110V to 575V.
are as expansion of the present invention; Inverter section can be the full-bridge inverting pattern of being made up of power semiconductor switches Q3, Q4, Q5, Q6 of the present invention; Also can be the semi-bridge inversion pattern of being made up of power semiconductor switches Q9, Q10 and capacitor C5, C6 shown in Figure 4, can also be the single-end ortho-exciting inverter mode of being made up of power semiconductor switches Q13, Q14 and diode D29, D30 shown in Figure 5.
the above is merely preferred embodiment of the present invention; Not in order to restriction the present invention; All interior any modifications of doing, be equal to replacement and improvement etc. in spirit of the present invention and principle, all should be included in protection scope of the present invention in.
Claims (10)
1. a wide input voltage range arc power equipment mainly comprises: list/three phase rectifier filter circuit, control circuit voltage stabilizing power supply; Compare decision circuitry, transducer control module, voltage detection module; Single group inverter topology; Inverter control circuit is characterized in that, said wide input voltage range arc power equipment also comprises: parallel connection boosting chopper circuit and series connection buck chopper device circuit; Said parallel connection boosting chopper circuit and series connection buck chopper device circuit are organized inverter topology UNICOM with transducer control module and list simultaneously;
Said list/three phase rectifier filter circuit carries out rectifying and wave-filtering to input supply voltage;
The voltage of said control circuit voltage stabilizing power supply after to list/three phase rectifier filter circuit rectifying and wave-filtering carries out voltage stabilizing;
Said relatively decision circuitry judges that the direct voltage after the voltage stabilizing is low-voltage group voltage, middle voltage group voltage or high voltage group voltage;
Said transducer control module receives the relatively judged result of decision circuitry, and then control parallel connection boosting chopper circuit and the series connection buck chopper device circuit direct voltage after to voltage stabilizing selects to carry out PWM boost voltage stabilizing pattern, direct mode operation or PWM lowering and stabilizing blood pressure pattern;
Said voltage detection module is carried out feedback regulation control to the voltage of parallel connection boosting chopper circuit and the output of series connection buck chopper device circuit;
Said single group inverter topology converts the magnitude of voltage of required frequency into to the direct voltage of parallel connection boosting chopper circuit and the output of series connection buck chopper device circuit;
Said inverter control circuit carries out FEEDBACK CONTROL through the voltage of this wide input voltage range arc power equipment output to single group inverter topology.
2. wide input voltage range arc power equipment according to claim 1 is characterized in that: said parallel connection boosting chopper circuit and series connection buck chopper device circuit be by power semiconductor switches Q1, Q2, diode D7, D8, and inductance L 1 and capacitor C 2 constitute.
3. wide input voltage range arc power equipment according to claim 2 is characterized in that: said list/three phase rectifier filter circuit is made up of list/three-phase bridge rectification bridge and the filter capacitor C1 parallelly connected with it.
4. wide input voltage range arc power equipment according to claim 3 is characterized in that: said relatively decision circuitry is by divider resistance R1, R2, comparator U1, U2, U3, and reference voltage V 1, V2, V3 and voltage range judge module constitute.
5. wide input voltage range arc power equipment according to claim 4 is characterized in that: said single group inverter topology is made up of inverter circuit, transformer T1, diode D9, D10 and inductance L 2.
6. wide input voltage range arc power equipment according to claim 5 is characterized in that: the full-bridge inverting pattern of said inverter circuit for being made up of power semiconductor switches Q3, Q4, Q5, Q6.
7. wide input voltage range arc power equipment according to claim 5 is characterized in that: the semi-bridge inversion pattern of said inverter circuit for being made up of power semiconductor switches Q9, Q10 and capacitor C 5, C6.
8. wide input voltage range arc power equipment according to claim 5 is characterized in that: the single-end ortho-exciting inverter mode of said inverter circuit for being made up of power semiconductor switches Q13, Q14 and diode D29, D30.
9. according to each described wide input voltage range arc power equipment of claim 1-8, it is characterized in that: said low-voltage group voltage is 110V, 115V, 200V, 208V, 220V, 230V and 240V; Middle voltage group voltage is 380V, 400V, 410V, 440V, 460V; High voltage group voltage is 575V.
10. wide input voltage range arc power equipment according to claim 9 is characterized in that: said wide input voltage range arc power equipment also comprises the air switch that is connected with current rectifying and wave filtering circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101761674A CN102684511A (en) | 2012-05-31 | 2012-05-31 | Wide-input voltage range arc power-supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101761674A CN102684511A (en) | 2012-05-31 | 2012-05-31 | Wide-input voltage range arc power-supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102684511A true CN102684511A (en) | 2012-09-19 |
Family
ID=46816002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101761674A Pending CN102684511A (en) | 2012-05-31 | 2012-05-31 | Wide-input voltage range arc power-supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102684511A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024560A (en) * | 2015-08-05 | 2015-11-04 | 哈尔滨工业大学 | Automatic conversion device of alternating current power supply |
| WO2016049988A1 (en) * | 2014-09-30 | 2016-04-07 | 深圳市茂润电气有限公司 | Smart matching step-down circuit and travel-use power conversion device |
| CN104158158B (en) * | 2013-05-15 | 2017-04-05 | 深圳市海洋王照明工程有限公司 | The straight-through protection circuit of full-bridge and half-bridge inversion circuit |
| US9654020B2 (en) | 2014-09-30 | 2017-05-16 | Guangdong Bestek E-Commerce Co., Ltd. | Smart matching step-down circuits and travel-use power conversion devices |
| CN106787708A (en) * | 2016-12-06 | 2017-05-31 | 矽力杰半导体技术(杭州)有限公司 | Power inverter and integrated circuit |
| CN108566099A (en) * | 2018-06-11 | 2018-09-21 | 浙江颐顿机电有限公司 | A kind of logical input Inverting digital welding machine of the whole network |
| CN111049360A (en) * | 2019-12-31 | 2020-04-21 | 广州金升阳科技有限公司 | Voltage reduction circuit and voltage reduction control method |
| CN116317668A (en) * | 2023-05-17 | 2023-06-23 | 苏州腾圣技术有限公司 | Inversion protection circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009142052A (en) * | 2007-12-06 | 2009-06-25 | Mitsubishi Electric Corp | Power converter |
| JP2009247187A (en) * | 2008-03-31 | 2009-10-22 | Mitsubishi Electric Corp | Power converter and its control method |
| CN102208875A (en) * | 2010-03-30 | 2011-10-05 | 比亚迪股份有限公司 | Method and circuit for controlling voltage stabilization of switching power supply |
| CN102281010A (en) * | 2010-06-12 | 2011-12-14 | 成都熊谷加世电器有限公司 | High-power single-loop contravariance soft switching arc welding power supply |
| CN202240080U (en) * | 2011-09-15 | 2012-05-30 | 深圳市佳士科技股份有限公司 | Inverted arc welding power supply |
| CN202565174U (en) * | 2012-05-31 | 2012-11-28 | 深圳华意隆电气股份有限公司 | Electric arc power device wide in input voltage range |
-
2012
- 2012-05-31 CN CN2012101761674A patent/CN102684511A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009142052A (en) * | 2007-12-06 | 2009-06-25 | Mitsubishi Electric Corp | Power converter |
| JP2009247187A (en) * | 2008-03-31 | 2009-10-22 | Mitsubishi Electric Corp | Power converter and its control method |
| CN102208875A (en) * | 2010-03-30 | 2011-10-05 | 比亚迪股份有限公司 | Method and circuit for controlling voltage stabilization of switching power supply |
| CN102281010A (en) * | 2010-06-12 | 2011-12-14 | 成都熊谷加世电器有限公司 | High-power single-loop contravariance soft switching arc welding power supply |
| CN202240080U (en) * | 2011-09-15 | 2012-05-30 | 深圳市佳士科技股份有限公司 | Inverted arc welding power supply |
| CN202565174U (en) * | 2012-05-31 | 2012-11-28 | 深圳华意隆电气股份有限公司 | Electric arc power device wide in input voltage range |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158158B (en) * | 2013-05-15 | 2017-04-05 | 深圳市海洋王照明工程有限公司 | The straight-through protection circuit of full-bridge and half-bridge inversion circuit |
| WO2016049988A1 (en) * | 2014-09-30 | 2016-04-07 | 深圳市茂润电气有限公司 | Smart matching step-down circuit and travel-use power conversion device |
| US9654020B2 (en) | 2014-09-30 | 2017-05-16 | Guangdong Bestek E-Commerce Co., Ltd. | Smart matching step-down circuits and travel-use power conversion devices |
| USRE48368E1 (en) | 2014-09-30 | 2020-12-22 | Guangdong Bestek Medical Devices Co., Ltd. | Smart matching step-down circuits and travel-use power conversion devices |
| CN105024560A (en) * | 2015-08-05 | 2015-11-04 | 哈尔滨工业大学 | Automatic conversion device of alternating current power supply |
| CN106787708A (en) * | 2016-12-06 | 2017-05-31 | 矽力杰半导体技术(杭州)有限公司 | Power inverter and integrated circuit |
| CN106787708B (en) * | 2016-12-06 | 2019-04-19 | 矽力杰半导体技术(杭州)有限公司 | Power inverter and integrated circuit |
| CN108566099A (en) * | 2018-06-11 | 2018-09-21 | 浙江颐顿机电有限公司 | A kind of logical input Inverting digital welding machine of the whole network |
| CN111049360A (en) * | 2019-12-31 | 2020-04-21 | 广州金升阳科技有限公司 | Voltage reduction circuit and voltage reduction control method |
| CN111049360B (en) * | 2019-12-31 | 2021-05-18 | 广州金升阳科技有限公司 | Voltage reduction circuit and voltage reduction control method |
| CN116317668A (en) * | 2023-05-17 | 2023-06-23 | 苏州腾圣技术有限公司 | Inversion protection circuit |
| CN116317668B (en) * | 2023-05-17 | 2023-08-15 | 苏州腾圣技术有限公司 | Inversion protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102684511A (en) | Wide-input voltage range arc power-supply device | |
| CN102686351B (en) | Utilize the universal input power supply of parallel power module | |
| CN107155383A (en) | Uninterrupted power supply(ups) | |
| CN107635712A (en) | Method and apparatus for providing welding and auxiliary power | |
| CN107534392A (en) | Method and apparatus for providing welding and auxiliary power | |
| EP2698907B1 (en) | Inverter control method and device, and inverter | |
| CN107431378A (en) | Uninterrupted power supply(ups) and the uninterruptible power system for having used the device | |
| CN102074971B (en) | Feedback load energy-saving circuit for aging test and control method thereof | |
| CN105490577A (en) | Motor control apparatus having function of discharging energy remaining in DC link | |
| CN107168448A (en) | Solar air conditioner control device, solar air conditioner and control method | |
| CN202565174U (en) | Electric arc power device wide in input voltage range | |
| Miguchi et al. | Control scheme for leading power factor operation of single-phase grid-connected inverter using an unfolding circuit | |
| CN208226873U (en) | A kind of logical input Inverting digital welding machine of the whole network | |
| US9667177B1 (en) | System and method for operating a three-phase load from a single phase source | |
| WO2015052743A1 (en) | Electrical power converter | |
| CN201878014U (en) | Feedback load energy-saving circuit for aging testing | |
| WO2016004896A1 (en) | Photovoltaic inverter and air conditioner | |
| CN102890209B (en) | Continuous current operation testing device of multi-level converter half-bridge type sub-module | |
| CN105048827B (en) | Voltage doubling rectifing circuit | |
| CN109905017A (en) | Auxiliary converter circuit, AuCT and auxiliary converter cabinet | |
| CN208895359U (en) | It powers welded condenser discharge welder and control mechanism | |
| CN206790358U (en) | A kind of shaking platform excitation power | |
| Win et al. | A half-bridge inverter based active power quality compensator with a DC voltage balancer for electrified railways | |
| CN107112917A (en) | Multivoltage welder | |
| CN102347618A (en) | Three-phase energy feedback device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120919 |