CN2222030Y - Quick compensation device for power factor of electric welding machine - Google Patents
Quick compensation device for power factor of electric welding machine Download PDFInfo
- Publication number
- CN2222030Y CN2222030Y CN 94212062 CN94212062U CN2222030Y CN 2222030 Y CN2222030 Y CN 2222030Y CN 94212062 CN94212062 CN 94212062 CN 94212062 U CN94212062 U CN 94212062U CN 2222030 Y CN2222030 Y CN 2222030Y
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- circuit
- welding machine
- power factor
- electric welding
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Abstract
The utility model discloses a quick compensation device for power factor of an electric welding machine, which is composed of a switching compensation part and a control part. The utility model is characterized in that a switching compensating circuit is formed by the concatenation of a contactless switch (2) and a compensation capacitor (3), a controlling circuit (1) is composed of a voltage detecting circuit (4), a current detection circuit (5), a logical gating circuit (6) and a pulse generator (7), and the signals of the electric network is sent to the logical gating circuit (6) by the voltage detecting circuit (4) and the current detection circuit (5) through the pulse generator (7) to control the contactless switch (2). The utility model has the advantages of simple structure and reliable performance, and can accurately and quickly realize the self regulation of the power factor. The utility model is suitable for the reactive compensation of a big power welding machine and a medium power welding machine.
Description
The utility model relates to a kind of automatic power factor compensator that is used for electric welding machine.
At present, the various big or middle power electric welding machine of domestic use, the electric welding machine that comprises import, owing to do not have secondary power factor autocompensation installation, when electric welding machine is worked, its operating current is big, power factor is very low, only has about 0.3, causes voltage to fluctuate widely and waste of energy, directly influence welding quality, often cause dry joint and rosin joint.And general automatic power factor compensator, can't follow the tracks of the consumer of this frequent variations significantly again, as the patent No. 89214181.6 ＂ ac arc wedling machine High Power Factor energy-saving appliance ＂, adopt the A.C. contactor major loop switch of circuit by way of compensation, this mechanical major loop switching response speed is slow, can only reach 0.1/ second the soonest, if with such speed break-make electric capacity in electrical network, certainly will bring very big overvoltage to impact to electrical network, and to contact itself bringing infringement, influence its reliability, therefore be difficult to adapt to the needs of large power, electrically welder power factor compensation.
The purpose of this utility model is for solving long-standing electric welding machine power factor compensation problem, and design is a kind of easy to use, reliable, can effectively control voltage pulsation, reduce load current, suppress reactive power fast, regulate power factor, do not have impact, no transient process, and electricity saving function electric welding machine automatic power factor compensator is arranged.
Structure of the present utility model comprises switch compensating circuit and control circuit.The switch compensating circuit is composed in series by noncontacting switch (2) and building-out capacitor (3), control circuit (1) is by voltage detecting circuit (4) current detection circuit (5), gate control circuit (6) and impulse generator (7) are formed, after electric welding machine is connected power supply, building-out capacitor promptly enters the floating charging state, but do not insert electrical network, control circuit (1) is in running order.Voltage detecting circuit (4), current detection circuit (5) are followed the tracks of detection of grid electric current, voltage signal, and detected signal sent into gating circuit (6), analyze relatively through gating circuit (6), send into impulse generator (7), the break-make of impulse generator (7) output pulse signal control contactless electronic beam switch (2).
The utility model has the advantages that: circuit structure is simple, dependable performance, quick, the accurate input compensation electric capacity of energy, no transient process, can not cause any voltage, current fluctuation, the compensation rate of can adjusting on demand, compensation one-time-reach-place, can effectively control reactive power, realize the automatic compensation of power factor, and the energy saves energy, the reactive-load compensation of big or middle power electric welding machine be applicable to.
Below in conjunction with drawings and Examples structure of the present utility model is further described.
Fig. 1 is the utility model electrical block diagram.
Fig. 2 is the electrical block diagram of the utility model control section.
By accompanying drawing (1) as can be known, structure of the present utility model comprises control section (1) and switch compensated part.The switch compensated part is composed in series by IGCT contactless electronic beam switch (2) and building-out capacitor (3); This connecting mode makes electric welding machine when connecting power supply, building-out capacitor promptly is filled, electric welding machine is in case start, control circuit (1) promptly sent trigger impulse in 0.02 second time, make contactless electronic beam switch (2) closure, the IGCT conducting drops into electrical network with building-out capacitor (3), its voltage, electric current enter stable state immediately after dropping into, and do not have transient process.Building-out capacitor (3) withdraws from when making it at current over-zero on the circuit design and withdraws from automatically, the no transient process operation of same realization.Like this, compensate in the electrical network of 50HZ, electric capacity (3) can guarantee to realize being switched on or switched off at one-period (0.02 second), realizes reactive-load compensation accurately and fast.
As shown in Figure 2, control section is by voltage detecting circuit (4), and current detection circuit (5) is patrolled and seized gate control circuit (6) and pulse trigger (7) formation.Voltage detecting circuit and current detection circuit are that 324 operational amplifiers are formed by model.The sampling voltage signal of voltage detecting circuit is obtained by transformer, be for the sine wave of load same-phase, same frequency, its positive half cycle part enters the negative input of operational amplifier, and another part enters the positive input of operational amplifier after filtering, shaping.When its negative-phase input voltage was higher than positive input voltage, operational amplifier overturn fast, the instantaneous low level that becomes, and when negative input voltage was lower than positive input voltage, operational amplifier is upset again.Near each the string crest value, export a negative square pulse that precipitous trailing edge is arranged, finish peak value and detect.Current detection circuit (5) signal is obtained by current transformer, equally also is sinusoidal wave, and when detecting current signal, the output high level is opened control gate.When voltage detecting circuit detects peak forward voltage, send the peak forward voltage signal to control gate.When the high level of opening control gate and voltage peak signal exist simultaneously, patrol and seize gate control circuit (6) starting impulse circuits for triggering (7), send trigger impulse, make thyratron transistor (2) conducting, building-out capacitor (3) is dropped into electrical network.In the common frequency power network of 50HZ, each cycle of trigger impulse is sent one, so thyratron transistor can respond to detected signal in 0.02 second time, realizes compensation automatically.
Claims (3)
1. electric welding machine power factor quick compensator, comprise switch compensated part and control section, control circuit (1) is made up of voltage detecting circuit (4), current detection circuit (5), gate control circuit (6) and impulse generator (7), voltage detecting circuit (4), current detection circuit (5) with the signal on the electrical network send into gate control circuit (6), through pulse generator (7), the gauge tap compensating circuit is characterized in that the switch compensating circuit is composed in series by noncontacting switch (2) and building-out capacitor (3).
2. electric welding machine power factor quick compensator as claimed in claim 1 is characterized in that described noncontacting switch (2) is a thyratron transistor.
3. electric welding machine power factor quick compensator as claimed in claim 1 is characterized in that described voltage detecting circuit (4), current detection circuit are that 324 operational amplifiers are formed by model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94212062 CN2222030Y (en) | 1994-05-19 | 1994-05-19 | Quick compensation device for power factor of electric welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94212062 CN2222030Y (en) | 1994-05-19 | 1994-05-19 | Quick compensation device for power factor of electric welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2222030Y true CN2222030Y (en) | 1996-03-13 |
Family
ID=33829034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94212062 Expired - Fee Related CN2222030Y (en) | 1994-05-19 | 1994-05-19 | Quick compensation device for power factor of electric welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2222030Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319939A (en) * | 2011-08-12 | 2012-01-18 | 丹东欣泰电气股份有限公司 | High-power factor electric welding machine |
-
1994
- 1994-05-19 CN CN 94212062 patent/CN2222030Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319939A (en) * | 2011-08-12 | 2012-01-18 | 丹东欣泰电气股份有限公司 | High-power factor electric welding machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |