CN103170710B - Multifunctional digital consumable electrode electric welding machine - Google Patents
Multifunctional digital consumable electrode electric welding machine Download PDFInfo
- Publication number
- CN103170710B CN103170710B CN201310103066.9A CN201310103066A CN103170710B CN 103170710 B CN103170710 B CN 103170710B CN 201310103066 A CN201310103066 A CN 201310103066A CN 103170710 B CN103170710 B CN 103170710B
- Authority
- CN
- China
- Prior art keywords
- circuit
- output
- welding machine
- electric welding
- welding
- 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.)
- Active
Links
Landscapes
- Generation Of Surge Voltage And Current (AREA)
- Arc Welding Control (AREA)
Abstract
The invention provides a kind of multifunctional digital consumable electrode electric welding machine, it is characterized in that: comprise main line, control circuit, power supply transformation circuit; Described main line comprises the EMI anti-clutter circuit, input rectification circuit, soft switching inverting circuit, output transformer, output rectification circuit and the electric welding machine output that are electrically connected successively; Described control circuit comprises: the sample circuit connecting electric welding machine output, gathers the voltage and current signal that electric welding machine exports; Welding parameter setting module, for setting welding parameter value; Connect the digital control circuit of sample circuit and welding parameter setting module, receive and process sample circuit gather electric welding machine output voltage and current signal, receive and process the welding parameter value set by welding parameter setting module, exporting and produce welding control signal; The Sofe Switch drive circuit of linking number word control circuit and soft switching inverting circuit.This electric welding machine welding precision is high, stable performance.
Description
Technical field
The present invention relates to a kind of electric welding machine, especially a kind of power supply of electric welding machine.
Background technology
Traditional welding machine electric power is all generally to be fed back by curtage by analogue technique to control power supply, this mode is used in general welding manner (manual welding, argon arc welding and plasma cut etc.), generally welding requirements can be met, but just controlling in the mode (welding of efficient fusion pole) that some welding requirements are higher by general analogue technique is not very desirable, and mainly control accuracy can not meet welding requirements.In traditional welding machine electric power, main line is all generally adopt hard switching inversion transformation technique, the large fragile poor reliability of loss of this mode power device.The protection of the power device in traditional welding machine electric power is also done perfect not.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art; a kind of multifunctional digital consumable electrode electric welding machine is provided; enhance overcurrent protection measure; adopt high-precision current sensor and in conjunction with digital microcontroller, the output voltage of feedback and output current controlled, optimizing the driving logic of switching inverter circuit.The technical solution used in the present invention is:
A kind of multifunctional digital consumable electrode electric welding machine, comprises main line, control circuit, power supply transformation circuit;
Described main line comprises the EMI anti-clutter circuit, input rectification circuit, soft switching inverting circuit, output transformer, output rectification circuit and the electric welding machine output that are electrically connected successively;
Described control circuit comprises:
Connect the sample circuit of electric welding machine output, gather the voltage and current signal that electric welding machine exports;
Welding parameter setting module, for setting welding parameter value;
Connect the digital control circuit of sample circuit and welding parameter setting module, receive and process sample circuit gather electric welding machine output voltage and current signal, receive and process the welding parameter value set by welding parameter setting module, exporting and produce welding control signal;
The Sofe Switch drive circuit of linking number word control circuit and soft switching inverting circuit, accepts the control of the welding control signal that digital control circuit exports, and produces driver' s timing signal and passes to soft switching inverting circuit; Under driver' s timing signal makes the power device IGBT pipe in soft switching inverting circuit be operated in " Sofe Switch " pattern.
The input of described power supply transformation circuit connects the output of EMI anti-clutter circuit, and the output of power supply transformation circuit connects described Sofe Switch drive circuit, welding parameter setting module, digital control circuit respectively; Power supply transformation circuit provides working power to the module in described control circuit or circuit.
Preferably, described soft switching inverting circuit, is provided with current protector W1 in its output loop, and the output of current protector W1 connects Sofe Switch drive circuit; Current protector W1 gathers the output current of soft switching inverting circuit; pass to Sofe Switch drive circuit; to make Sofe Switch drive circuit produce guard signal when the output current of soft switching inverting circuit is greater than setting threshold value, to turn off the IGBT pipe in soft switching inverting circuit.
Preferably, the welding expert module of a linking number word control circuit is also comprised in described control circuit; Welding expert module is built-in with the welding cell obtained by a large amount of soldering tests, also has the welding cell that provides of welding expert both domestic and external, can provide the contrast of welding parameter for digital control circuit.
Advantage of the present invention: adopt novel single-chip microcomputer STM32F103 tap into row accurate Calculation by high-precision electric current and Voltage Feedback butt welding and contrast main control line road, the stability of welding arc is significantly improved.Main line adopts digital soft switch technology, reduces the switching loss of power device.Use novel power device IGBT, make the loss of complete machine significantly reduce and improve reliability.Strengthen the protection to power device IGBT.
Accompanying drawing explanation
Fig. 1 is logic diagram of circuit of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Fig. 3 is driver' s timing signal schematic representation of the present invention.
Detailed description of the invention
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1:
A kind of multifunctional digital consumable electrode electric welding machine, comprises main line, control circuit, power supply transformation circuit 11;
Described main line comprises the EMI anti-clutter circuit 1, input rectification circuit 2, soft switching inverting circuit 3, output transformer 4, output rectification circuit 5 and the electric welding machine output that are electrically connected successively;
Described control circuit comprises:
Connect the sample circuit 6 of electric welding machine output, gather the voltage and current signal that electric welding machine exports;
Welding parameter setting module 8, for setting welding parameter value;
Connect the digital control circuit 7 of sample circuit 6 and welding parameter setting module 8, receive and process sample circuit 6 gather electric welding machine output voltage and current signal, receive and process the welding parameter value set by welding parameter setting module 8, exporting and produce welding control signal;
The Sofe Switch drive circuit 10 of linking number word control circuit 7 and soft switching inverting circuit 3, accepts the control of the welding control signal that digital control circuit 7 exports, and produces driver' s timing signal and passes to soft switching inverting circuit 3;
The input of described power supply transformation circuit 11 connects the output of EMI anti-clutter circuit 1, and the output of power supply transformation circuit 11 connects described Sofe Switch drive circuit 10, welding parameter setting module 8, digital control circuit 7 respectively; Power supply transformation circuit 11 provides working power to the module in described control circuit or circuit.
Preferably, described soft switching inverting circuit 3, is provided with current protector W1 in its output loop, and the output of current protector W1 connects Sofe Switch drive circuit 10; Current protector W1 gathers the output current of soft switching inverting circuit 3; pass to Sofe Switch drive circuit 10; to make Sofe Switch drive circuit 10 produce guard signal when the output current of soft switching inverting circuit 3 is greater than setting threshold value, to turn off the IGBT pipe in soft switching inverting circuit 3.
Preferably, the welding expert module 9 of a linking number word control circuit 7 is also comprised in described control circuit; Welding expert module 9 is built-in with the welding cell obtained by a large amount of soldering tests, also has the welding cell that provides of welding expert both domestic and external, can provide the contrast of welding parameter for digital control circuit 7.
Circuit theory of the present invention as shown in Figure 2, after industrial-frequency alternating current inputs this electric welding machine, first enters EMI anti-clutter circuit 1, EMI anti-clutter circuit 1 and is made up of a series of filter inductance and filter capacitor, can interference effectively in filtering electrical network.
What EMI anti-clutter circuit 1 rear stage connected is input rectification circuit 2, and described input rectification circuit 2 comprises rectifier bridge QL1, filter capacitor C1, C2, C3; Filter capacitor C1 is connected in parallel on two outputs of rectifier bridge QL1, and filter capacitor C2 and C3 is connected in parallel on two outputs of rectifier bridge QL1 again after connecting; The connected node ground connection of filter capacitor C2 and C3.Input rectification circuit 2 provides direct current for next stage soft switching inverting circuit 3.
What input rectification circuit 2 rear stage connected is soft switching inverting circuit 3, described soft switching inverting circuit 3 is primarily of IGBT pipe Q1, Q2, Q3, Q4 composition, and each IGBT pipe all adopts in IGBT(Fig. 2 of built-in damper diode and do not draw built-in damper diode).The colelctor electrode of IGBT pipe Q1 with Q2 links together and is connected the positive output end of input rectification circuit 2, and the emitter stage of IGBT pipe Q3 with Q4 links together and is connected the negative output terminal of input rectification circuit 2; The emitter stage of IGBT pipe Q2 is connected with the colelctor electrode of IGBT pipe Q4, and as the first output of soft switching inverting circuit 3, the emitter stage of IGBT pipe Q1 is connected with the colelctor electrode of IGBT pipe Q3, as the second output of soft switching inverting circuit 3; Each grid and the emitter stage of IGBT pipe Q1, Q2, Q3, Q4 are connected the output of Sofe Switch drive circuit 10 respectively, accept the driver' s timing signal that Sofe Switch drive circuit 10 exports;
Described output transformer 4 comprises elementary L10, with tapped secondary L11, L12 and L13; First output of above-mentioned soft switching inverting circuit 3 connects one end of the elementary L10 of output transformer 4, the other end of L10 connects current protector W1 by electric capacity C4, current protector W1 connects the second output of soft switching inverting circuit 3, defines the output loop of soft switching inverting circuit 3; This output transformer 4 adopts multiple secondary parallel, effectively can increase output current.
Current protector W1 gathers the output current of soft switching inverting circuit 3; pass to Sofe Switch drive circuit 10; so that Sofe Switch drive circuit 10 produces guard signal when the output current of soft switching inverting circuit 3 is excessive; to turn off IGBT pipe Q1, Q2, Q3, Q4 in time, prevent IGBT pipe Q1, Q2, Q3, Q4 from damaging.
Described output rectification circuit 5 comprises resistance R11, R12, R13, electric capacity C11, C12, C13, commutation diode D1, D2, D3, D4, D5, D6, inductance L 14; Resistance R11 and electric capacity C11 is connected in parallel on the two ends of output transformer 4 level L11 again after connecting, resistance R12 and electric capacity C12 is connected in parallel on the two ends of output transformer 4 level L12 again after connecting, resistance R13 and electric capacity C13 is connected in parallel on the two ends of output transformer 4 level L13 again after connecting; Output transformer 4 level L11, L12, L13 centre tap separately link together, and are connected with one end of inductance L 14; Commutation diode D1, D2, D3 anode is separately connected with one end of L11, one end of L12, one end of L13 respectively, and commutation diode D4, D5, D6 anode is separately connected with the other end of L11, the other end of L12, the other end of L13 respectively; Commutation diode D1, D2, D3, D4, D5, D6 negative electrode separately links together and positive output end with electric welding machine connects.
Described sample circuit 6 comprises voltage sample circuit, and the positive output end of electric welding machine and negative output terminal are connected to described digital control circuit 7 by respectively, and voltage sample circuit gathers the voltage signal that electric welding machine exports, and feeds back to digital control circuit 7; Described sample circuit 6 also comprises a current sensor W2, between the other end that current sensor W2 is serially connected in described inductance L 14 and the negative output terminal of electric welding machine, the output of current sensor W2 connects described digital control circuit 7, current sensor W2 gathers the current signal that electric welding machine exports, and feeds back to digital control circuit 7.Current sensor W2 has selected the LAH100-P of lime company, and its precision is high, good stability.
Described welding parameter setting module 8 forms primarily of single-chip microcomputer U2, for setting welding parameter value; The present embodiment single-chip microcomputer U2 adopts STC12C5A60AD, can arrange various welding (aluminium, stainless steel, carbon steel, copper) detail parameters, mainly comprise welding current, weldingvoltage, pulse frequency, receive arc current, receive arc voltage etc., the preset value of various welding parameter is provided to digital control circuit 7.
Described welding expert module 9 forms primarily of single-chip microcomputer U3, and the present embodiment single-chip microcomputer U3 adopts STC12C5A60S2.Welding expert module 9 is built-in with the welding cell obtained by a large amount of soldering tests, also has the welding cell that provides of welding expert both domestic and external, can provide the contrast of welding parameter for digital control circuit 7.
Described digital control circuit 7 forms primarily of single-chip microcomputer U1, the present embodiment single-chip microcomputer U1 adopts the STM32F103 of ST Microelectronics, digital control circuit 7 processes the static welding parameter and dynamic welding parameter that obtain, best welding control signal is provided to Sofe Switch drive circuit 10, make electric welding machine be operated in best situation, ensure that the shaping of various welding and quality.Described static welding parameter comprises welding parameter value set by welding parameter setting module 8, call welding cell that welding expert module 9 provides in welding parameter.Described dynamic welding parameter refers to the electric welding machine output voltage that the sample circuit 6 received gathers and current signal.
Described Sofe Switch drive circuit 10 is primarily of CPLD(CPLD) composition, it accepts the control of the welding control signal that digital control circuit 7 exports, and produces driver' s timing signal and passes to soft switching inverting circuit 3.Owing to have employed ripe CPLD Sofe Switch drive circuit 10, significantly reduce the usage quantity of device in circuit, reduce the usable floor area of circuit board, shorten the line length of wiring board, so significantly reduce the trouble point of wiring board, enhance the antijamming capability of wiring board, improve the reliability of wiring board, can the switching sequence of control IGBT pipe accurately.
Driver' s timing signal as shown in Figure 3, driver' s timing signal comprises voltage drive signals S1, S2, S3, S4 of four tunnel same period, in one-period, the positive pulse of S1 and S4 originates in synchronization, the positive pulse width of S4 is greater than the positive pulse width of S1, after the positive pulse termination of S4, interval one Dead Time, the positive pulse of S3 and S2 originates in synchronization, the positive pulse width of S3 and S1 is equal, and the positive pulse width of S2 and S4 is equal, after the positive pulse termination of S2, interval one Dead Time, just starts next cycle again.
Four tunnel voltage drive signals S1, S2, S3, S4 are added to the grid of IGBT pipe Q1 and emitter stage, the grid of IGBT pipe Q2 and emitter stage, the grid of IGBT pipe Q3 and emitter stage, the grid of IGBT pipe Q4 and emitter stage respectively.The work schedule of IGBT pipe is: 1, and time initial, Q1 and Q4 is simultaneously open-minded, and because Q4 is still in conducting state when turning off to Q1, therefore Q1 voltage of bearing when turning off is very little.2, when turning off to Q4, because the damper diode of IGBT pipe inside has afterflow effect, the self induction voltage of the elementary L10 of output transformer 4 that pruned, therefore Q4 voltage of bearing when turning off is also very little.3, between Q4 turns off and Q3 opens, there is a Dead Time, the voltage of such Q2 and Q3 elementary L10 of output transformer 4 when opening is almost nil.4, then the course of work of Q2 with Q3 is the same with the course of work of Q1 and Q4, after Q2 conducting terminates, before next cycle, between Q2 turns off and Q1 opens, also there is a Dead Time.Whole one-period, the voltage that four IGBT pipes bear when opening and close is all smaller, thus can reduce the switching loss of IGBT pipe.
Described power supply transformation circuit 11 comprises transformer TR1 and TR2, obtains industrial-frequency alternating current from the output of EMI anti-clutter circuit 1, supplies Sofe Switch drive circuit 10, welding parameter setting module 8, digital control circuit 7, welding expert module 9 after step-down.
Claims (7)
1. a multifunctional digital consumable electrode electric welding machine, is characterized in that: comprise main line, control circuit, power supply transformation circuit;
Described main line comprises the EMI anti-clutter circuit, input rectification circuit, soft switching inverting circuit, output transformer, output rectification circuit and the electric welding machine output that are electrically connected successively;
Described control circuit comprises:
Connect the sample circuit of electric welding machine output, gather the voltage and current signal that electric welding machine exports;
Welding parameter setting module, for setting welding parameter value;
Connect the digital control circuit of sample circuit and welding parameter setting module, receive and process sample circuit gather electric welding machine output voltage and current signal, receive and process the welding parameter value set by welding parameter setting module, exporting and produce welding control signal;
The Sofe Switch drive circuit of linking number word control circuit and soft switching inverting circuit, accepts the control of the welding control signal that digital control circuit exports, and produces driver' s timing signal and passes to soft switching inverting circuit;
The input of described power supply transformation circuit connects the output of EMI anti-clutter circuit, and the output of power supply transformation circuit connects described Sofe Switch drive circuit, welding parameter setting module, digital control circuit respectively;
Described soft switching inverting circuit, is provided with current protector W1 in its output loop, the output of current protector W1 connects Sofe Switch drive circuit; Current protector W1 gathers the output current of soft switching inverting circuit, passes to Sofe Switch drive circuit, produces guard signal to make Sofe Switch drive circuit when the output current of soft switching inverting circuit is greater than setting threshold value;
The welding expert module of a linking number word control circuit is also comprised in described control circuit;
The static welding parameter that digital control circuit process obtains and dynamic welding parameter, best welding control signal is provided to Sofe Switch drive circuit, described static welding parameter comprises welding parameter value set by welding parameter setting module, call welding cell that welding expert module provides in welding parameter, described dynamic welding parameter refers to the electric welding machine output voltage that the sample circuit received gathers and current signal.
2. multifunctional digital consumable electrode electric welding machine as claimed in claim 1, it is characterized in that: described soft switching inverting circuit forms primarily of IGBT pipe Q1, Q2, Q3, Q4, the colelctor electrode of IGBT pipe Q1 with Q2 links together and is connected the positive output end of input rectification circuit, and the emitter stage of IGBT pipe Q3 with Q4 links together and is connected the negative output terminal of input rectification circuit; The emitter stage of IGBT pipe Q2 is connected with the colelctor electrode of IGBT pipe Q4, and as the first output of soft switching inverting circuit, the emitter stage of IGBT pipe Q1 is connected with the colelctor electrode of IGBT pipe Q3, as the second output of soft switching inverting circuit; Each grid and the emitter stage of IGBT pipe Q1, Q2, Q3, Q4 are connected the output of Sofe Switch drive circuit respectively, accept the driver' s timing signal that Sofe Switch drive circuit exports.
3. multifunctional digital consumable electrode electric welding machine as claimed in claim 2, it is characterized in that: the driver' s timing signal that described Sofe Switch drive circuit exports comprises the voltage drive signals S1 of four tunnel same period, S2, S3, S4, in one-period, the positive pulse of S1 and S4 originates in synchronization, the positive pulse width of S4 is greater than the positive pulse width of S1, after the positive pulse termination of S4, interval one Dead Time, the positive pulse of S3 and S2 originates in synchronization, the positive pulse width of S3 and S1 is equal, the positive pulse width of S2 and S4 is equal, after the positive pulse termination of S2, interval one Dead Time again, just start next cycle, four tunnel voltage drive signals S1, S2, S3, S4 are added to the grid of IGBT pipe Q1 and emitter stage, the grid of IGBT pipe Q2 and emitter stage, the grid of IGBT pipe Q3 and emitter stage, the grid of IGBT pipe Q4 and emitter stage respectively.
4. multifunctional digital consumable electrode electric welding machine as claimed in claim 1, it is characterized in that: described sample circuit comprises voltage sample circuit, the positive output end of electric welding machine and negative output terminal are connected to described digital control circuit by respectively, voltage sample circuit gathers the voltage signal that electric welding machine exports, and feeds back to digital control circuit; Described sample circuit also comprises a current sensor W2, and current sensor W2 gathers the current signal that electric welding machine exports, and feeds back to digital control circuit.
5. multifunctional digital consumable electrode electric welding machine as claimed in claim 4, is characterized in that: described current sensor W2 is the LAH100-P of lime company.
6. multifunctional digital consumable electrode electric welding machine as claimed in claim 1, is characterized in that: described digital control circuit forms primarily of single-chip microcomputer U1.
7. multifunctional digital consumable electrode electric welding machine as claimed in claim 1, is characterized in that: described output transformer adopts multiple secondary parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310103066.9A CN103170710B (en) | 2013-03-27 | 2013-03-27 | Multifunctional digital consumable electrode electric welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310103066.9A CN103170710B (en) | 2013-03-27 | 2013-03-27 | Multifunctional digital consumable electrode electric welding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103170710A CN103170710A (en) | 2013-06-26 |
| CN103170710B true CN103170710B (en) | 2015-08-19 |
Family
ID=48631136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310103066.9A Active CN103170710B (en) | 2013-03-27 | 2013-03-27 | Multifunctional digital consumable electrode electric welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103170710B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386535B (en) * | 2013-07-12 | 2015-02-11 | 深圳华意隆电气股份有限公司 | Digitized inverter welding machine |
| CN103586564B (en) * | 2013-10-28 | 2015-09-09 | 广东电网公司电力科学研究院 | Based on the Pulse MIG Welding Power Source system of STM32 |
| CN106112245A (en) * | 2016-08-11 | 2016-11-16 | 无锡洲翔成套焊接设备有限公司 | Digital multi mash welder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101259557A (en) * | 2007-08-10 | 2008-09-10 | 湖南超宇科技有限公司 | Embedded system operated digitalization soft switch inversion arc welder |
| CN101618472A (en) * | 2009-08-06 | 2010-01-06 | 唐山松下产业机器有限公司 | Soft switching inversion welding machine |
| CN201552368U (en) * | 2009-10-31 | 2010-08-18 | 华南理工大学 | Inverter welding power source for aluminum alloy double-wire double pulse digitized soft switch |
| CN101913015A (en) * | 2010-07-29 | 2010-12-15 | 薛家祥 | Thin double-wire digital soft switch inverter welding power source system and control method thereof |
| CN203156203U (en) * | 2013-03-27 | 2013-08-28 | 无锡洲翔成套焊接设备有限公司 | Multifunctional digital consumable electrode welding machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3186109B2 (en) * | 1991-08-23 | 2001-07-11 | 株式会社ダイヘン | Power supply for AC arc welding |
| KR100842877B1 (en) * | 2007-05-18 | 2008-07-04 | 주식회사 파워웰 | Dc arc inverter welding machine |
| KR20120122271A (en) * | 2011-04-28 | 2012-11-07 | 부경대학교 산학협력단 | Digital CO2 Welding Machine with Current Servo and Anti-electric Shock Functions |
-
2013
- 2013-03-27 CN CN201310103066.9A patent/CN103170710B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101259557A (en) * | 2007-08-10 | 2008-09-10 | 湖南超宇科技有限公司 | Embedded system operated digitalization soft switch inversion arc welder |
| CN101618472A (en) * | 2009-08-06 | 2010-01-06 | 唐山松下产业机器有限公司 | Soft switching inversion welding machine |
| CN201552368U (en) * | 2009-10-31 | 2010-08-18 | 华南理工大学 | Inverter welding power source for aluminum alloy double-wire double pulse digitized soft switch |
| CN101913015A (en) * | 2010-07-29 | 2010-12-15 | 薛家祥 | Thin double-wire digital soft switch inverter welding power source system and control method thereof |
| CN203156203U (en) * | 2013-03-27 | 2013-08-28 | 无锡洲翔成套焊接设备有限公司 | Multifunctional digital consumable electrode welding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103170710A (en) | 2013-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103586564B (en) | Based on the Pulse MIG Welding Power Source system of STM32 | |
| CN105515377A (en) | Soft switch high gain direct current converter based on coupling inductances and voltage doubling capacitors | |
| CN204442176U (en) | A kind of switched inductors type accurate Z source DC-DC converter circuit | |
| CN104779790A (en) | Switched inductance quasi-Z source DC-DC converter circuit | |
| CN103170710B (en) | Multifunctional digital consumable electrode electric welding machine | |
| CN104009633A (en) | Current continuous type high-gain DC-DC converter circuit | |
| CN104883046A (en) | High-power factor critical continuous mode buck-boost power factor correction converter | |
| CN101386098A (en) | Micro-controller control method of soft-switch invert welding source of electric welding machine | |
| CN204481681U (en) | A kind of interleaved parallel PFC switching power circuit | |
| CN203156203U (en) | Multifunctional digital consumable electrode welding machine | |
| CN203151389U (en) | Control circuit of three-phase high power factor rectifier | |
| CN203219195U (en) | Bridgeless PFC converter capable of Buck and Buck-Boost switching work | |
| CN101127482B (en) | Original edge clamp circuit of DC converter | |
| CN102255513B (en) | Bridge type synchronous rectification circuit | |
| CN204948016U (en) | A kind of photovoltaic power generation apparatus adopting zero voltage switch auxiliary resonance | |
| CN204497972U (en) | A kind of novel retention time circuit structure | |
| CN204258274U (en) | A kind of overvoltage of wide input voltage range Switching Power Supply and under-voltage protecting circuit | |
| CN204886697U (en) | High -gain boost circuit | |
| CN106655804A (en) | Vienna PFC-based intelligent half-bridge correction wave voltage conversion circuit | |
| CN207782664U (en) | Three Level Full Bridge Sofe Switch convertor circuits, welding machine, electrolysis water power supply and charger | |
| CN204906192U (en) | Boost module is recommended to wide region full cut -off ring high efficiency | |
| CN204696729U (en) | A kind of alternately parallel full adaptation charging circuit | |
| CN103546026A (en) | Single-phase high-gain no-bridge power factor correction converter | |
| CN102570791A (en) | Circuit for expanding PFC power and PFC circuit | |
| CN104014915A (en) | Digital twin-wire submerged arc welding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |