CN1282299C - Reactance regulating circuit and its application - Google Patents
Reactance regulating circuit and its application Download PDFInfo
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- CN1282299C CN1282299C CN 03108733 CN03108733A CN1282299C CN 1282299 C CN1282299 C CN 1282299C CN 03108733 CN03108733 CN 03108733 CN 03108733 A CN03108733 A CN 03108733A CN 1282299 C CN1282299 C CN 1282299C
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Abstract
The present invention provides a reactance regulation circuit which belongs to a power electronic basic circuit, and relates to a basic element circuit which utilizes a bidirectional electronic switch to adjust reactance and reduce voltage of the reactance. The reactance regulation circuit is composed of a reactance winding [1], a control winding [2], an iron core [3], a bidirectional electronic switch [4] and a control circuit of the bidirectional electronic switch [4]. The reactance regulation circuit is characterized in that the windings and the bidirectional electronic switching are connected in parallel; the method for adjusting the break-make ratio of the bidirectional electronic switch is used, and thus, the purposes for adjusting the reactance and reducing the voltage of the reactance are achieved. The reactance regulation circuit can be widely used for single-phase alternating current voltage stabilizers, three-phase alternating current voltage stabilizers, electricity saving devices, electric welders, charging machines, compensators and other occasions with the requirements of reactance adjustment. The novel alternating current voltage stabilizer which uses the reactance regulation circuit has the advantages of simple and reliable structure, no contact, low cost, favorable performance, etc., and can replace the existing single-phase alternating current voltage stabilizers and three-phase alternating current voltage stabilizers. The electric welder which uses the reactance regulation circuit has the advantages of no mechanical oscillation, convenient regulation, simple structure, etc., and can replace the existing welding machines of BX1, BX2, BX6, ZMG, etc.
Description
(1) technical field the invention belongs to power electronics scientific domain base unit circuit, relates to the Method and circuits that uses bidirectional electronic switch to regulate iron core reactance and reactance pressure drop, and uses the product that the reactance regulating circuit is made.
(2) the background technology iron core reactor is the parts that are wound with coil on the iron core, its coil flows through electric current and just has reactance and reactance pressure drop in ac circuit, there are a lot of occasions all to need the continuous stepless adjusting is carried out in iron core reactance and reactance pressure drop, so that adopt the entire circuit of iron core reactance to have needed characteristic of some people and function.
Existing method of regulating the iron core reactance has: 1) regulate the method for air-gap in the iron circuit, it is to regulate the principle that air gap changes magnetic resistance in the magnetic circuit with mobile moving iron core to realize regulating, and the method is widely used in the electric welding machine product.It exist need with the mechanical transmission mechanism moving iron core regulate, vibration is big and be difficult for realizing shortcoming such as adjusting automatically.2) regulate iron core magnetic saturation degree methods, it is to increase a DC control winding in iron core, makes the iron core dc magnetization with adding adjustable dc voltage, and the principle that permeability is changed realizes the reactance of reactance winding and the adjusting of reactance pressure drop.The method is all having application aspect the adjusting control of 614 type AC voltage regulator, electric welding machine and system, and it exists and must add a DC control supply and regulate the bigger shortcoming of time constant.3) regulate the method for passing through the iron core reactive current.It is to use bidirectional electronic switch directly to be in series with the reactance winding, uses electric current that the reactance winding is flow through in adjusting to realize the adjusting of reactance and reactance pressure drop.It is applied in compensator and the voltage regulator in 615 types and 616 type AC voltage regulator.Its shortcoming is that the withstand voltage and rated current of bidirectional electronic switch is decided by the voltage and the size of current that flows through reactor in the external circuit fully, the current class of bidirectional electronic switch can not be lower than the current maxima by coil, withstand voltagely can not be lower than the magnitude of voltage that external circuit applies, the present invention will seek the Method and circuits with above-mentioned adjusting reactance inequality, and absorb the part advantage of above-mentioned adjusting reactance Method and circuits, overcome some shortcoming of above-mentioned adjusting reactance.
(3) summary of the invention the present invention increases an AC current control winding (2) on the iron core column that is wound with reactance winding (1), and control winding (2) two ends, or between the winding two ends that are in series by winding (1) and winding (2) parallel connection bidirectional electronic switch (4).Use and regulate the bidirectional electronic switch make-to-break ratio, the method for regulating the induced current that induced potential produced in the winding reaches reactance and the reactance pressure drop of regulating reactance winding (1) two ends.
Single-phase reactance regulating circuit of the present invention, it is made up of reactance winding (1), control winding (2), iron core (3) and bidirectional electronic switch (4) and control circuit (5) thereof, the two ends (6,7) that it is characterized in that reactance winding (1) are connected with the external electric loop that needs are regulated reactance and reactance pressure drop, and bidirectional electronic switch (4) has with the method for attachment of control winding: a) bidirectional electronic switch (4) is in parallel with control winding (2); (b) bidirectional electronic switch (4) is in parallel with the series connection winding that reactance winding (1) has 1 different name end to be connected with control winding (2), uses the break-make of regulating bidirectional electronic switch (4) recently to regulate the reactance and the reactance pressure drop at reactance winding (1) two ends.
Use single phase alternating current (A.C.) pressurizer of the present invention, it is made up of single-phase reactance regulating circuit and single-phase step-up autotransformer, it is characterized in that the winding that reactance winding (1) and autotransformer common winding (13) are in series is connected civil power input (U
1) two ends, perhaps reactance winding (1) and the autotransformer winding that winding (12) is in series that boosts is connected between the non-common port of input and output.
Use single-phase consubstantiality formula arc welding transformer of the present invention, it is made up of single-phase reactance regulating circuit and single-phase arc welding transformer, it is characterized in that reactance winding (1) and arc welding transformer secondary winding (12) are in series; Perhaps the winding that is in series of reactance winding (1) and the elementary winding of arc welding transformer (13) is the input voltage winding, and reactance winding iron core and arc welding transformer iron core be to use with 1 day word iron core (3), for improve striking voltage also can be on the elementary winding of arc welding transformer 1 striking boost capacitor C in parallel.
Three-phase reactance regulating circuit of the present invention, it is by 3 reactance windings (1), 3 control windings (2), 1 iron core (3) and 1 three-phase bidirectional electronic switch or 3 single phase bidirectional electronic switches (4) and control circuit (5) thereof are formed, it is characterized in that 3 reactance windings (1) are connected with the outside three-phase loop of needs adjusting three-phase reactance and reactance pressure drop respectively, use 1 three-phase bidirectional electronic switch can regulate 3 induced current sizes of controlling in the windings (2) that induced potential produced simultaneously by control circuit (5), the induced current sizes that induced potential produced of perhaps using 3 single phase bidirectional electronic switches (4) to regulate respectively in 3 control windings (2) are regulated reactance and reactance pressure drop.
Use three-phase AC voltage stabilizer of the present invention, it is made up of three-phase reactance regulating circuit and three-phase voltage increasing autotransformer, it is characterized in that three-phase reactance winding iron core and three-phase voltage increasing autotransformer iron core are to use same field word iron core (3), the left side day of field word iron core is 6 windings in the three-phase voltage increasing autotransformer on the word iron core, 6 windings on the right side day word iron core in three-phase reactance regulating circuit.
Use three-phase reactance regulating circuit and three phase rectifier formula Arc Welding Power, it is characterized in that 3 reactance windings (1) in the three-phase reactance regulating circuit and 3 elementary windings of three-phase rectifier transformer are in series, and three-phase reactance winding iron core and three-phase transformer iron core are to use same field word iron core (3), the left side day of field word iron core is 6 windings in three-phase reactance regulating circuit on the word iron core, the right side day of field word iron core on the word iron core around 6 windings of three-phase rectifier transformer.Use 1 three-phase bidirectional electronic switch or 3 single phase bidirectional electronic switches, regulate the output current size by control circuit (5).
Circuit of the present invention all is to use the method for regulating the bidirectional electronic switch make-to-break ratio, regulates the winding induced potential is produced in the iron core reactor induced current and regulates the reactance at each reactance winding two ends and reactance pressure drop.Therefore can claim that it is an induced current reactance regulating circuit, or it is called Gong Shi reactance regulating circuit, to distinguish existing reactance regulating circuit and Regulatable reactor.
The present invention and air gap are regulated the method for reactance and are compared, have no mechanical vibration, good reliability, easy to adjust, be convenient to realize advantages such as adjusting and Characteristics Control automatically.The present invention compares with magnetic saturation reactance regulating circuit, have do not need external dc power supply, time constant is little, simple in structure and low cost and other advantages.The present invention compares with the reactance regulating circuit of the direct series reactance winding of bidirectional electronic switch, because the present invention can use the method for adjusting two umber of turn ratios, realize that bidirectional electronic switch with high withstand voltage little electric current replaces the bidirectional electronic switch of big current low voltage, perhaps in contrast, and bidirectional electronic switch and winding are directly to be in parallel or to be equivalent to be in parallel, thus the present invention just have between the withstand voltage and electric current of bidirectional electronic switch can change mutually as required, harmonic wave is few and the reliability advantages of higher.
Circuit of the present invention is the base unit regulating circuit that circuit characteristic is regulated and controlled.Can be widely used in exchanging stabilized power supply, electricity-saving appliance, electric welding machine, charger, rectifying installation and automatic control system etc.It has contactless, do not have mechanical governor motion, simple in structure, the adjusting time is short, cost is low and advantage such as good reliability, has very big economic benefit and social benefit after the application.
Characteristic of the present invention and advantage will be described further in the drawings and Examples of back.
(4) appended drawings 1 is a single-phase and three-phase reactance regulating circuit of the present invention, wherein (a) and (b) be respectively the single-phase reactance regulating circuit of transformer and autotransformer type of attachment is respectively the three-phase reactance regulating circuit of transformer and autotransformer type of attachment (c) and (d).Accompanying drawing 2 is embodiment that the present invention is applied to the single phase alternating current (A.C.) pressurizer.Accompanying drawing 3 is another embodiment that the present invention is applied to the single phase alternating current (A.C.) pressurizer.Accompanying drawing 4 is embodiment that the present invention is applied to consubstantiality formula alternating current arc welding transformer.Accompanying drawing 5 is another embodiment that the present invention is applied to consubstantiality formula alternating current arc welding transformer.Accompanying drawing 6 is embodiment that the present invention is applied to three-phase AC voltage stabilizer.Accompanying drawing 7 is embodiment that the present invention is applied to three phase rectifier formula Arc Welding Power.
Accompanying drawing 1 (a) is a single-phase transformer formula reactance regulating circuit of the present invention, it is made up of iron core (3), reactance winding (1), control winding (2), bidirectional electronic switch (4) and control circuit (5), (6,7) are two ends of winding (1), it is connected with the alternating current loop of outside need adjusting reactance respectively, (8,9) are two ends of winding (2), and it is connected with bidirectional electronic switch (4) respectively.The conducting of control circuit (5) control bidirectional electronic switch and the time ratio of shutoff.When external circuit makes when having electric current to flow through in the winding (1), just there is alternating flux to exist in the iron core (3), all can produce induced potential on winding (1) and the winding (2), in bidirectional electronic switch (4) conduction period, the induced potential on the winding will form short circuit induced current.This electric current will be gone up at iron core (3) and produce 1 opposite magnetic flux, makes the total magnetic flux in the iron core (3) drop to minimum value, and the reactance and the reactance pressure drop of winding this moment (1) drop to minimum value.At bidirectional electronic switch (4) blocking interval, though winding has induced potential, do not have induced current, the magnetic flux in the iron core (3) is reduced, the reactance and the reactance pressure drop of winding this moment (1) they are maximum.So as long as regulate the make-to-break ratio of bidirectional electronic switch (4) in one-period, reactance and the reactance pressure drop that just can regulate easily between winding (1) two ends (6,7) are regulated to continuous stepless between minimum value and the maximum.
Accompanying drawing 1 (b) is in order to reduce the number of turn and the lead of control winding (2) in the accompanying drawing 1 (a), make the reactance winding also become the part of control winding, at this moment, the control winding just is made up of 2 windings in series that are connected by 1 different name end, bidirectional electronic switch (4) still is in parallel with the The whole control winding, its operation principle and circuit feature and accompanying drawing 1 (a) are finished identical, because two windings are to link to each other with the autotransformer form in the circuit, therefore, claim that it is a single-phase self-coupling formula reactance regulating circuit.
Accompanying drawing 1 (c) is a three-phase transformer formula reactance regulating circuit, it is made up of A, B and C3 public 1 iron core of single-phase reactance regulating circuit (3) and public 1 three-phase bidirectional electronic switch (4) and control circuit (5) thereof, operation principle is identical with accompanying drawing 1 (a), 6 ends of 3 reactance windings (1) are connected with the electric loop of 3 needs adjusting three-phases reactance respectively, 6 ends of 3 reactance windings (2) are connected with 1 three-phase bidirectional electronic switch (4), perhaps are connected with 3 single phase bidirectional electronic switches.3 control windings (2) can connect into triangle, star or six end input forms.Control circuit (5) is being controlled the make-to-break ratio of 1 three-phase or 3 single phase bidirectional electronic switches, regulates reactance and the reactance pressure drop of make-to-break ratio with regard to 3 windings (1) in the reactance of scalable tri-phase iron core.
Similar in order to reduce the number of turn of controlling winding (2) in the three-phase reactor and lead and above-mentioned single phase circuit, its 6 windings can be connected into the autotransformer form that is similar to, accompanying drawing 1 (d) illustrates autocoupling type three-phase reactance regulating circuit.
Bidirectional electronic switch used in the present invention (4) can be the sinusoidal pulse width control type of phase shifting control type, symmetric angle control type, PWM pulse width control type and SPWM, can also add the harmonic current filter circuit as required in circuit.Three-phase bidirectional electronic switch (4) can use between two dc output ends of rectification circuit a direct current in parallel to cut control device to form, it only needs to use one to cut control piece and reach with regard to the induced current in 3 control of the scalable three-phase winding and regulate three-phase reactance and reactance pressure drop simultaneously, and three-phase reactance regulating circuit is simplified.
Single-phase and three-phase reactance regulating circuit of the present invention and transformer or autotransformer are in series, and will exports in the introducing control circuit (5) of sampling, just can obtain to use patented products such as multiple AC voltage regulator of the present invention and electric welding machine.
(5) embodiment is used reactance regulating circuit of the present invention and step-up auto-transformer is in series, and introduces the output sampling in the control circuit (5) of reactance regulating circuit, just can realize output voltage stabilization, becomes AC voltage regulator.
The present invention is applied to the embodiment that one of preferred structure of single phase alternating current (A.C.) pressurizer is an accompanying drawing 2, by accompanying drawing 2 as can be known, be wound with two windings of the reactance regulating circuit of accompanying drawing 1 (a) on the stem stem above the day word iron core (3), be wound with the common winding (13) of step-up auto-transformer and the winding that boosts (12) on day following 2 stem stems of word iron core (3).(7) end of reactance winding (1) joins with autotransformer input (14), input line voltage U1 between (6) end of reactance winding (1) and the autotransformer input and output common port (11), two outputs of autotransformer (10,11) output voltage U 2.When civil power U1 was minimum, the full conducting of bidirectional electronic switch (4), reactance pressure drop were near zero, and U1 boosts through autotransformer winding (12) and exports U2.When civil power when minimum rises to peak gradually, the make-to-break ratio of being exported the bidirectional electronic switch (4) of sampling adjusting reduces gradually, the two ends pressure drop of reactance winding is increased gradually, and make its reactance pressure drop that increases equal civil power rising magnitude of voltage, just can make output U2 voltage not be subjected to civil power U1 variable effect and reach the voltage stabilizing purpose.It is a kind of a kind of AC voltage regulator that is connected the autotransformer input that reactance is regulated.
As required also can be with on 2 windings of the reactance regulating circuit on the accompanying drawing 2,2 stem stems below day word iron core, and with 2 windings of autotransformer above day word iron core on 1 stem stem.
The present invention be applied to the single phase alternating current (A.C.) pressurizer preferred structure two are embodiment of accompanying drawing 3.By illustration 3 as can be known, it is a kind of AC voltage regulator that the reactance regulating circuit is connected the autotransformer output.The center pinch of day word iron core (3) and left side stem stem are respectively around autotransformer common winding (13) and the winding that boosts (12).On the stem stem of day iron core right side around accompanying drawing 1 (b) reactance winding (1) with control winding (2); (10) end of winding (12) of boosting is held with (7) of reactance winding (1) and is linked to each other.Civil power U1 boosts through autotransformer, again through reactance winding (1) step-down output U2.Pressurizer zero load shown in the accompanying drawing 3, bidirectional electronic switch (4) are when closing, and winding (1), winding (12) and winding (13) the upward polarity of induced voltage are negative just down on all being.Induced voltage on reactance winding (1) is regulated bidirectional electronic switch (4) make-to-break ratio during greater than the induced voltage of the winding that boosts (12), but the voltage at step-less adjustment reactance winding (1) two ends just.Thereby can make output voltage U 2 in input voltage U1 continuous stepless adjusting up and down, and as long as will exporting the adjusting that is incorporated into bidirectional electronic switch (4) make-to-break ratio of sampling, we just can obtain voltage stabilizing output, become AC voltage regulator.
AC voltage regulator in the accompanying drawing 3 also can be with the exit reconfiguration above the winding (13) to the reactance winding end that is connected with the winding that boosts.
Above-mentioned several single phase alternating current (A.C.) pressurizer, have contactless, simple in structure, cost is low, the reliability advantages of higher, fully can
It is accompanying drawing 4 that the present invention is applied to one of preferred means of ac arc wedling machine, it is made up of single-phase reactance regulating circuit and single-phase arc welding transformer, it is characterized in that the reactance winding (1) of reactance regulating circuit and the secondary winding (12) of arc welding transformer are in series, and reactance winding iron core and arc welding transformer iron core are to use with 1 day word iron core (3), by regulating the break-make ratio of single phase bidirectional electronic switch (4), change the reactance of the secondary series connection of arc welding transformer and reach and regulate the arc-welding electric current.
Another preferred structure that the present invention is applied to ac arc wedling machine is an accompanying drawing 5, it also is made up of single-phase reactance regulating circuit and single-phase arc welding transformer, it is characterized in that reactance winding (1) and the elementary winding of arc welding transformer (13) are in series, and reactance winding iron core and arc welding transformer iron core are to use also with 1 day word iron core (3).Because the reactance windings in series can make the arc welding transformer striking voltage reduce in the primary winding loop, be unfavorable for striking, for addressing this problem, (patent No.: patented technology 96245461.3) is parallel with 1 striking boost capacitor C to " AC welding set of band ac capacitor " of using same inventor to design in the present embodiment on the elementary winding (13) of arc welding transformer.It and accompanying drawing 4 differences are: accompanying drawing 4 is reactance to be regulated be placed in the welding transformer secondary loop, and accompanying drawing 5 is reactance to be regulated be placed in the welding transformer primary return.The alternating current arc welding transformer of accompanying drawing 4 and accompanying drawing 5; they are the great innovations to the BX2 type consubstantiality formula arc welding transformer in colleges and universities' Arc Welding Power teaching material; make the electricity consumption control method substitute outmoded mechanical regulation method, overcome shortcomings such as the large and small electric current shakiness of the existing mechanical oscillation of BX2 type consubstantiality formula arc welding transformer, adjusting inconvenience fully.Its not only applicable big electric current, but also applicable little electric current, easy to adjust can realize that also feedback regulation is to improve the arc-welding performance.It can replace existing most of BX1, BX2, BX3 arc welding transformer.
The present invention is applied to the embodiment that the three-phase AC voltage stabilizer preferred structure is an accompanying drawing 6.It is to be composed in series by three-phase reactance regulating circuit and three-phase voltage increasing autotransformer, three-phase reactance winding iron core and three-phase transformer iron core use same field word iron core (3), the left side day of field word iron core on the word iron core around 6 windings of three-phase voltage increasing autotransformer, 6 windings on the right side day word iron core in three-phase reactance regulating circuit.A1, b1, c1 are the three-phase alternating current input, and a2, b2, c2 are three-phase voltage stabilizing output.Realize voltage stabilizing output in the control circuit (5) of three-phase output sampling introducing three-phase bidirectional electronic switch (4).It takes the high-power compensation type ac voltage stabilizer of three-phase that carbon brush regulates to existing motor and compares, have contactless, good reliability, adjusting rapidly, low cost and other advantages.
The preferred structure that the present invention is applied to three phase rectifier formula Arc Welding Power is the embodiment of accompanying drawing 7.By accompanying drawing 7 as can be known, it is held C, three-phase bridge rectifier and filter inductance and is formed by three-phase reactance regulating circuit, three-phase rectifier transformer, striking piezoelectricity.It is characterized in that three-phase reactance winding iron core and three-phase transformer iron core are to use with 1 field word iron core (3), the left side day of field word iron core is wound with 6 windings of three-phase reactance regulating circuit of the present invention on the word iron core column, be wound with 6 windings of three-phase rectifier transformer on the day word iron core column of word iron core right side, field, and on 3 elementary windings (13), be parallel with striking boost capacitor C, regulate reactance pressure drop on the three-phase reactance winding with 3 bidirectional triode thyristors, make the adjusted device of input voltage of the elementary winding of three-phase rectifier transformer on the right side day word iron core, also make simultaneously three-phase secondary around mutually and rectification output dc voltage and electric current adjusted.It is compared with 2XG type three-phase magnetic amplifier type Arc Welding Rectifier, and its iron core quantity just can reduce 6, and is simple in structure, and cost is low to be the substitute products of existing 2XG type magnetic amplifier type Arc Welding Rectifier.
Claims (9)
1, a kind of reactance regulating circuit, it is made up of reactance winding (1), control winding (2), iron core (3) and bidirectional electronic switch (4) and control circuit (5) thereof, the two ends (6 that it is characterized in that reactance winding (1), 7) be connected with the external electric loop that needs to regulate reactance and reactance pressure drop, bidirectional electronic switch (4) has with the method for attachment of control winding: (a) bidirectional electronic switch (4) is in parallel with control winding (2); (b) bidirectional electronic switch (4) is in parallel with the series connection winding that reactance winding (1) has 1 different name end to be connected with control winding (2), uses the break-make of regulating bidirectional electronic switch (4) recently to regulate the reactance and the reactance pressure drop at reactance winding (1) two ends.
2, application rights requires the three-phase reactance regulating circuit that 1 described reactance regulating circuit is made, it is made up of 3 reactance windings (1), 3 control winding (2), 1 iron cores (3) and 1 three-phase bidirectional electronic switch (4) and control circuit (5) thereof, it is characterized in that 1 three-phase bidirectional electronic switch can regulate 3 induced current that induced potential produced that control in the winding simultaneously.
3, a kind of AC voltage regulator is made up of described reactance regulating circuit of claim 1 and step-up auto-transformer, it is characterized in that the winding that the common winding (13) of reactance winding (1) and autotransformer is in series is connected civil power input (U1) two ends.
4, a kind of AC voltage regulator is made up of described reactance regulating circuit of claim 1 and step-up auto-transformer, and the winding that it is characterized in that boosting reactance winding (1) and autotransformer winding (12) is in series is connected between the non-common port of input and output.
5,, it is characterized in that reactance winding iron core and the step-up auto-transformer iron core in the reactance regulating circuit is to use with 1 day word iron core (3) according to claim 3 or 4 described AC voltage regulator.
6, application rights requires the three-phase AC voltage stabilizer that 2 described three-phase reactance regulating circuits are made, it is made up of three-phase reactance regulating circuit and three-phase voltage increasing autotransformer, it is characterized in that three-phase reactance winding iron core and three-phase voltage increasing autotransformer iron core are to use with 1 field word iron core (3), the left side day of field word iron core is 6 windings in the three-phase voltage increasing autotransformer on the word iron core, 6 windings on the right side day word iron core in three-phase reactance regulating circuit.
7, a kind of consubstantiality formula arc welding transformer, form by described reactance regulating circuit of claim 1 and single-phase arc welding transformer, it is characterized in that reactance winding (1) and arc welding transformer secondary winding (12) are in series, and reactance winding iron core and the same 1 day word iron core (3) of arc welding transformer iron core use.
8, application rights requires the single-phase consubstantiality formula arc welding transformer that 1 described reactance regulating circuit is made, it is characterized in that reactance winding (1) and the elementary winding of arc welding transformer (13) are in series, and reactance winding iron core and arc welding transformer iron core are to use with 1 day word iron core (3), and 1 striking boost capacitor C that is in parallel with elementary winding (13) is arranged.
9, application rights requires the rectifier type Arc Welding Power that 2 described three-phase reactance regulating circuits are made, it is characterized in that 3 reactance windings (1) in the three-phase reactance regulating circuit and 3 elementary windings of three-phase rectifier transformer are in series, and three-phase reactance winding iron core and three-phase transformer iron core are to use with 1 field word iron core (3), use 3 single phase bidirectional electronic switches, or use 1 three-phase bidirectional electronic switch to regulate output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108733 CN1282299C (en) | 2003-03-25 | 2003-03-25 | Reactance regulating circuit and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108733 CN1282299C (en) | 2003-03-25 | 2003-03-25 | Reactance regulating circuit and its application |
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| CN1444334A CN1444334A (en) | 2003-09-24 |
| CN1282299C true CN1282299C (en) | 2006-10-25 |
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| CN 03108733 Expired - Fee Related CN1282299C (en) | 2003-03-25 | 2003-03-25 | Reactance regulating circuit and its application |
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| DE102006050624A1 (en) * | 2006-10-26 | 2008-04-30 | Siemens Ag | Reactance connecting device for transformer in electric arc furnace, has induction coil and standalone load switch for adjusting reactance of induction coil under load, where induction coil is provided with multiple tapping points |
| CN112803787A (en) * | 2019-10-28 | 2021-05-14 | 株洲中车机电科技有限公司 | Locomotive traction transformer and application thereof |
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