CN101525105A - Suspended magnet driving circuit - Google Patents
Suspended magnet driving circuit Download PDFInfo
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- CN101525105A CN101525105A CN200910126928A CN200910126928A CN101525105A CN 101525105 A CN101525105 A CN 101525105A CN 200910126928 A CN200910126928 A CN 200910126928A CN 200910126928 A CN200910126928 A CN 200910126928A CN 101525105 A CN101525105 A CN 101525105A
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Abstract
The invention provides a suspended magnet driving circuit for realizing low heat emission without losing control ability of suspended magnet. One execution mode of the invention suspended magnet driving circuit (1), which includes a H bridge circuit component (4) comprising: the first and the second switching elements (41a), (41b) connected in series between the high potential side power supply and low potential side power supply; the third and forth switching elements (41c), (41d) connected in series between the high potential side power supply and low potential side power supply; the first-forth rectifying elements (42a-42b). When carrying field excitation of the suspended magnet (2), one of the first and the fourth switching elements (41a), (41d) is switched, at least the switched switching element of the first-fourth switching elements (41a-41d) is a non-contact switch, other switching elements are contact switches.
Description
Technical field
The present invention relates to carry out the excitation of lifting magnet and the crane magnet driving circuit of demagnetization.
Background technology
Generally, we know the lifting magnet (lifting magnet) that is used to mention iron plate in cargo handling operation or construction operation etc.As lifting magnet, except equipment, also have and carry on vehicle as factory etc.When using lifting magnet, lifting magnet is carried out excitation, and make it hold iron plate and mention.And, when putting down iron plate, lifting magnet is carried out demagnetization.
Record the excitation of carrying out lifting magnet and the crane magnet driving circuit of demagnetization at patent documentation 1,2.These crane magnet driving circuits have H bridge circuit portion, and this H bridge circuit portion comprises 4 on-off elements and 4 diodes, and the excitation and the demagnetization of control lifting magnet.In the crane magnet driving circuit of patent documentation 1 record, use 4 on-off elements of contact switch as H bridge circuit portion, in the crane magnet driving circuit of patent documentation 2 records, use 4 on-off elements of noncontacting switch as H bridge circuit portion.
Here, said contact switch is that the mechanically switch of the contact of contact is arranged, and is mechanical switch such as relay.Said noncontacting switch is the switch of the contact that mechanically do not contact, is semiconductor switchs such as aerotron.
Patent documentation 1: TOHKEMY 2000-143138 communique;
Patent documentation 2: TOHKEMY 2006-311633 communique.
But at crane magnet driving circuit, when carrying out the excitation of lifting magnet and demagnetization, the on-off element of H bridge circuit portion carries out switch motion.About this point, the on-off element of H bridge circuit portion is preferably the crane magnet driving circuit of being put down in writing as patent documentation 2 switching speed noncontacting switch faster.But because the internal driving of noncontacting switch is bigger, heating is bigger when therefore noncontacting switch being used for the on-off element of H bridge circuit portion.
In addition, because crane magnet driving circuit carries on the equipment of outdoor application, when therefore considering sunlight direct projection and equipment internal heat generation etc., the heating of expectation crane magnet driving circuit is little.About this point, the on-off element of H bridge circuit portion is preferably the less contact switch of internal driving as the crane magnet driving circuit of patent documentation 1 record.But, because the switching speed of contact switch is slower, so when using contact switch on the on-off element of H bridge circuit portion, the controlled reduction of the excitation of lifting magnet and demagnetization.For example,, need carry out the constant voltage control of the voltage supplied with to lifting magnet or the constant current control of electric current in order to continue to hold iron plate, but these controlled reductions.
Summary of the invention
Therefore, the object of the present invention is to provide and a kind ofly do not lose the controlled of lifting magnet and can realize low heat-producing crane magnet driving circuit.
Crane magnet driving circuit of the present invention, carry out the excitation and the demagnetization of lifting magnet, has H bridge circuit portion, this H bridge circuit portion comprises: the 1st and the 2nd on-off element, be connected in series successively between hot side power supply and low potential side power supply, the node between the described the 1st and the 2nd on-off element is connected with an end of lifting magnet; The the 3rd and the 4th on-off element is connected in series between hot side power supply and low potential side power supply successively, and the node between the described the 3rd and the 4th on-off element is connected with the other end of lifting magnet; And the 1st～the 4th rectifier cell, be connected in parallel with the 1st～the 4th on-off element respectively, described H bridge circuit portion controls the excitation and the demagnetization of lifting magnet, described crane magnet driving circuit is when carrying out the excitation of lifting magnet, after the 1st and the 4th on-off element conducting, some in the 1st and the 4th on-off element carries out switch motion, at least the on-off element that carries out switch motion in the 1st～the 4th on-off element is a noncontacting switch, and at least one of other on-off element is contact switch.
According to this crane magnet driving circuit, when carrying out the excitation of lifting magnet, make the 1st and the 4th on-off element conducting after, make some in the 1st and the 4th on-off element carry out switch motion, therefore requiring faster, the on-off element of switching speed has only one.Because this on-off element uses switching speed to use the smaller contact switch of internal driving than noncontacting switch faster, other on-off element at least, therefore can not lose the controlled of lifting magnet and realize low heating.
Above-mentioned H bridge circuit portion also have with the 1st and the 4th on-off element in, the 5th on-off element that the on-off element that carries out switch motion is connected in parallel, the 5th on-off element is preferably contact switch.
According to this structure, the on-off element that carries out switch motion in the 1st and the 4th on-off element does not carry out switch motion and is under the situation of off-state, can make the 5th on-off element carry out switch motion.In addition, according to this structure, since as the 5th on-off element use with the 1st and the 4th on-off element in the different contact switch of the on-off element that carries out switch motion, therefore, can reduce also that the 5th on-off element does not carry out switch motion and the probability that becomes off-state even under identical environmental conditions.Its result can realize reliability.
In addition, be preferably, above-mentioned H bridge circuit portion also have with the 1st and the 4th on-off element in the circuit breaker that is connected in series of the on-off element that carries out switch motion.
According to this structure, the on-off element that carries out switch motion in the 1st and the 4th on-off element does not carry out switch motion and becomes under the situation of short-circuit condition, can cut off excess current by circuit breaker.Its result can realize reliability.
In addition, be preferably, above-mentioned H bridge circuit portion also have with the 1st～the 4th on-off element in use the energy absorbing portion that is connected in parallel of the on-off element of contact switch.
The switch that the contact is arranged produces arc discharge sometimes, and produces big arc voltage when the switching of conducting state and nonconducting state.But according to this structure, can absorb the N/R arc voltage, improve the controlled of lifting magnet by energy absorbing portion.
According to the present invention, in crane magnet driving circuit, can not lose the controlled of lifting magnet and the low heating of realization.
Description of drawings
Fig. 1 is the circuit diagram of the crane magnet driving circuit of expression the 1st embodiment of the present invention.
Fig. 2 is the figure of the flow direction of the electric current under the excitation actuating pattern in the crane magnet driving circuit shown in the presentation graphs 1.
Fig. 3 is the figure of the flow direction of the electric current under the excitation actuating pattern in the crane magnet driving circuit shown in the presentation graphs 1.
Fig. 4 is the figure of the flow direction of the electric current under the demagnetization pattern in the crane magnet driving circuit shown in the presentation graphs 1.
Fig. 5 is the figure of the flow direction of the electric current under the demagnetization pattern of the residual magnetic in the crane magnet driving circuit shown in the presentation graphs 1.
Fig. 6 is the circuit diagram of the crane magnet driving circuit of expression the 2nd embodiment of the present invention.
Fig. 7 is the circuit diagram of the crane magnet driving circuit of expression the 3rd embodiment of the present invention.
Label declaration
1,1A, 1B crane magnet driving circuit
2 lifting magnets
3 DC converting portions
The positive side mouth of 3a (hot side power supply)
3b minus side mouth (low potential side power supply)
31a～31f diode
4,4A, 4B H bridge circuit portion
41a～41d the 1st～the 4th on-off element
42a～42d the 1st～the 4th diode (the 1st～the 4th rectifier cell)
43 circuit breakers
44 the 5th on-off elements
45b, 45c, 45d absorb circuit (the energy absorbing portion that puts down in writing in claims)
46b, 46c, 46d impedor
47b, 47c, 47d capacity cell
48b, 48c, 48d diode
5 demagnetizations energy absorbing portion
51 capacity cells
The specific embodiment
Below, with reference to accompanying drawing preferred implementation of the present invention is elaborated.In addition, in each figure to identical or cooresponding part additional phase with label.
[the 1st embodiment]
Fig. 1 is the circuit diagram of the crane magnet driving circuit of expression the 1st embodiment of the present invention.Crane magnet driving circuit 1 shown in Figure 1 is to carry out the excitation of lifting magnet 2 and the circuit of demagnetization, comprises DC converting portion 3, H bridge circuit portion 4 and demagnetization energy absorbing portion 5.
The alternating-current voltage/AC voltage V that DC converting portion 3 will be provided by three-phase alternating-current supply ACG
AC1～V
AC3Be transformed to vdc V
DC DC converting portion 3 has positive side mouth 3a and minus side mouth 3b, with the direct supply voltage V that is generated
DCOffer between positive side mouth 3a and the minus side mouth 3b.In the present embodiment, positive side mouth 3a works as the hot side power supply, and minus side mouth 3b works as the low potential side power supply.In addition, DC converting portion 3 also can be to be the mode of vdc with the AC voltage conversion from single phase alternating current power supply.In addition, DC converting portion 3 not necessarily must be provided with.In this case, between positive side mouth 3a and minus side mouth 3b, supply with vdc from battery or dynamo generator etc.
The DC converting portion 3 of present embodiment is made of the bridge circuit that comprises 6 diode 31a～31f, carries out three phase full wave rectification.Specifically, in diode 31a～31f, diode 31a and 31b are connected in series, and diode 31c and 31d are connected in series, and diode 31e and 31f are connected in series.In addition, the group that constitutes by diode 31a and 31b, the group that constitutes by diode 31c and 31d and parallel with one another connection of group that constitutes by diode 31e and 31f.And an end of the negative side of the group of these diodes is electrically connected with positive side mouth 3a, and the other end of side of the positive electrode is electrically connected with minus side mouth 3b.
In addition, between diode 31a and diode 31b, be electrically connected with the AC power cord 11a that extends from the phase terminals for power supplies of three-phase alternating-current supply ACG.Between diode 31c and diode 31d, be electrically connected with the AC power cord 11b that extends from another phase terminals for power supplies of three-phase alternating-current supply ACG.Between diode 31e and diode 31f, be electrically connected with the AC power cord 11c that extends from other phase terminals for power suppliess of three-phase alternating-current supply ACG.In addition, DC converting portion also can or use the mixed electrical bridge circuit of diode and thyristor to constitute by the pure bridge circuit that has for example used thyristor beyond this.Under the situation that DC converting portion is made of pure bridge circuit or mixed electrical bridge circuit, with the control angle of regulation thyristor is carried out phase control by not shown phase control circuit.
The excitation and the demagnetization of 4 pairs of lifting magnets 2 of H bridge circuit portion are controlled.H bridge circuit portion 4 constitutes the 1st～the 4th diode (the 1st～the 4th rectifier cell) 42a～42d that described H bridge circuit comprises the 1st～the 4th on-off element 41a～41d and is electrically connected by the H bridge circuit between the 1st～the 4th on-off element 41a～41d drain-source utmost point separately.
Specifically, the end of the 1st on-off element 41a is connected with the positive side mouth 3a of DC converting portion 3, and the other end of the 1st on-off element 41a is connected with the end of the 2nd on-off element 41b.The other end of the 2nd on-off element 41b is connected with the minus side mouth 3b of DC converting portion 3.On the other hand, the end of the 3rd on-off element 41c is connected with the positive side mouth 3a of DC converting portion 3, and the other end of the 3rd on-off element 41c is connected with the end of the 4th on-off element 41d.The other end of the 4th on-off element 41d is connected with the minus side mouth 3b of DC converting portion 3.In addition, the positive pole of the 1st～the 4th diode 42a～42d is connected with the other end of the 1st～the 4th on-off element 41a～41d respectively, and the negative pole of the 1st～the 4th diode 42a～42d is connected with the end of the 1st～the 4th on-off element 41a～41d respectively.And the end of the other end of the 1st on-off element 41a and the 2nd on-off element 41b is connected with an end of lifting magnet 2, and the end of the other end of the 3rd on-off element 41c and the 4th on-off element 41d is connected with the other end of lifting magnet 2.
Each control terminal of the 1st～the 4th on-off element 41a～41d is connected with not shown control circuit, and each a end and the conducting state between the other end of the 1st～the 4th on-off element 41a～41d controlled by the control current (perhaps controlling voltage) that is provided by this control circuit.
In the present embodiment, the 1st on-off element 41a among the 1st and the 2nd on-off element 41a, the 41d is a noncontacting switch, and other the 2nd～the 4th on-off element 41b～41d is a contact switch.
As noncontacting switch, can using not mechanically, the switch of the contact of contact is semiconductor switchs such as aerotron.Noncontacting switch is big owing to internal driving generates heat greatly, has switching speed characteristics faster but then.
On the other hand, as contact switch, can use the switch with the contact that mechanically contacts is mechanical switch such as relay.The switching speed of contact switch is slower, has the little characteristics of generating heat owing to internal driving is less but then.
Demagnetization is to be used for absorbing the circuit part of savings at the energy of lifting magnet 2 when carrying out the demagnetization of lifting magnet 2 with energy absorbing portion 5.Demagnetization is connected between the positive side mouth 3a and minus side mouth 3b of DC converting portion 3 with energy absorbing portion 5.Demagnetization has capacity cell 51 with energy absorbing portion 5.
Then, the action with reference to the crane magnet driving circuit 1 of Fig. 2～5 pair the 1st embodiment describes.The figure of the current direction under each pattern of crane magnet driving circuit shown in Figure 1 is represented in Fig. 2～5th.
(the excitation actuating pattern of lifting magnet)
Make the 1st on-off element 41a and the 4th on-off element 41d conducting of H bridge circuit portion 4.Thus, as shown in Figure 2, exciting current I1 flows through the minus side mouth 3b of positive side mouth 3a, the 1st on-off element 41a, lifting magnet the 2, the 4th on-off element 41d and the DC converting portion 3 of DC converting portion 3.
Then, make the 1st not conducting of on-off element 41a.Thus, as shown in Figure 3, back flow current I2 flows through lifting magnet the 2, the 4th on-off element 41d and the 2nd diode 42b.Afterwards, make the 1st on-off element 41a conducting again.Thus, as shown in Figure 2, flow through exciting current I1.
Like this, by switch the 1st on-off element 41a, lifting magnet 2 is by excitation, can adsorpting iron plate etc. and mention.The ratio of the switch by adjusting the 1st on-off element 41a can be carried out the constant voltage control of voltage that lifting magnet 2 is applied and the constant current of electric current and control, thereby can be continued adsorpting iron plate.
Here, because the 1st on-off element 41a is switching speed noncontacting switch faster, therefore can improve controlled that the constant current of the constant voltage control of the voltage that lifting magnet 2 is applied and electric current controls.
In addition, the ratio of the switch by adjusting the 1st on-off element 41a can be adjusted the voltage that is applied on the lifting magnet 2, and can adjust the energy of savings in lifting magnet 2.Thus, for example can adjust the intensity of adsorpting iron plate.In present embodiment,, therefore also can improve the controlled of this adjustment because the switching speed of the 1st on-off element 41a is very fast.
In addition, the 4th on-off element 41d does not carry out switch motion, and therefore, the switching speed of requirement is lower.Owing to use the less contact switch of internal driving at the 4th on-off element 41d, therefore can reduce heating.
(the demagnetization pattern of lifting magnet)
Make the 1st on-off element 41a and the 4th not conducting of on-off element 41d of H bridge circuit portion 4, make the both end voltage counter-rotating of lifting magnet 2.Thus, as shown in Figure 4, erasing current I3 flows through the capacity cell 51 and the 2nd diode 42b of lifting magnet the 2, the 3rd diode 42c, demagnetization usefulness energy absorbing portion 5, and savings is transferred to capacity cell 51 at the energy of lifting magnet 2, and savings is in capacity cell 51.
Thus, lifting magnet 2 is by demagnetization, and can discharge iron plate of absorption etc.
(the demagnetization pattern of the residual magnetic of lifting magnet)
Here, lifting magnet 2 owing to hysteresis characteristic has residual magnetic.Therefore, make the 2nd on-off element 41b and the 3rd on-off element 41c conducting of H bridge circuit portion 4.Thus, as shown in Figure 5, the erasing current I4 of residual magnetic flows through capacity cell 51,3rd on-off element 41c, lifting magnet 2 and the 2nd on-off element 41b of demagnetization with energy absorbing portion 5.That is, because the electric charge of savings in capacity cell 51 flows through the erasing current I4 with the oppositely directed residual magnetic of erasing current I3 in lifting magnet 2.
Thus, lifting magnet 2 is fully by demagnetization, and can discharge iron plate of absorption etc.When carrying out the demagnetization of this residual magnetic, because the 2nd and the 3rd on-off element 41b, 41c do not carry out switch motion, therefore the switching speed that requires is lower.Owing to use the smaller contact switch element of internal driving at the 2nd and the 3rd on-off element 41b, 41c, therefore can reduce heating.
Like this, crane magnet driving circuit 1 according to the 1st embodiment, when carrying out the excitation of lifting magnet 2, make the 1st on-off element 41a carry out switch motion after for example making the 1st and the 4th on-off element 41a, 41d conducting, therefore require to have only one of the 1st on-off element 41a than switching speed faster.Owing on the 1st on-off element 41a, use switching speed than noncontacting switch faster, use the smaller contact switch of internal driving at least, therefore can not lose the controlled of lifting magnet 2 and realize low heating at other the 2nd～the 4th on-off element 41b～41d.
[the 2nd embodiment]
Fig. 6 is the circuit diagram of the crane magnet driving circuit of relevant the 2nd embodiment of the present invention of expression.Crane magnet driving circuit 1A shown in Figure 6 replaces H bridge circuit portion 4 and has on the structure of the H bridge circuit 4A of portion in crane magnet driving circuit 1, different with the 1st embodiment.
The H bridge circuit 4A of portion also has in H bridge circuit portion 4 on the structure of circuit breaker 43 and the 5th on-off element 44, and portion 4 is different with the H bridge circuit.
The 5th on-off element 44 is connected in parallel with respect to the circuit series of the 1st on-off element 41a and circuit breaker 43.The 5th on-off element 44 is contact switches different with the noncontacting switch of the 1st on-off element 41a.
Relating to the crane magnet driving circuit 1A of the 2nd embodiment, also can access the advantage identical with the crane magnet driving circuit 1 of the 1st embodiment.
In addition, crane magnet driving circuit 1A according to the 2nd embodiment, because the H bridge circuit 4A of portion has the 5th on-off element 44 that is connected in parallel with the 1st on-off element 41a, therefore can not carry out switch motion and be under the situation of off-state at the 1st on-off element 41a, make the 5th on-off element 44 carry out switch motion.In addition owing to use and the different contact switches of the 1st on-off element 41a at the 5th on-off element 44, even so under identical environmental conditions, can reduce also that the 5th on-off element 44 does not carry out switch motion and the probability that is in off-state.Its result can realize reliability.
In addition, crane magnet driving circuit 1A according to the 2nd embodiment, because the H bridge circuit 4A of portion has the circuit breaker 43 that is connected in series with the 1st on-off element 41a, therefore do not carry out switch motion and be under the situation of short-circuit condition at the 1st on-off element 41a, can cut off excess current by circuit breaker 43.Its result can realize reliability.
[the 3rd embodiment]
Fig. 7 is the circuit diagram of the crane magnet driving circuit of relevant the present invention's the 3rd embodiment of expression.Crane magnet driving circuit 1B shown in Fig. 7 replaces the H bridge circuit 4A of portion and has on the structure of the H bridge circuit 4B of portion in crane magnet driving circuit 1A, different with the 2nd embodiment.
The H bridge circuit 4B of portion also has on the structure of absorption circuit (the energy absorbing portion that puts down in writing in claims) 45b, 45c, 45d different with the H bridge circuit 4A of portion in the H bridge circuit 4A of portion.Absorption circuit 45b, 45c, 45d are connected in parallel with the 2nd～the 4th on-off element 41b～41d respectively.
Absorb circuit 45b and have impedor 46b, capacity cell 47b and diode 48b.Impedor 46b and capacity cell 47b are connected in series, and impedor 46b and diode 48b are connected in parallel.Specifically, the positive pole of diode 48b is connected with node between impedor 46b and the capacity cell 47b, and the negative pole of diode 48b is connected with the other end of impedor 46b.
Equally, absorb circuit 45c and have impedor 46c, capacity cell 47c and diode 48c.Impedor 46c and capacity cell 47c are connected in series, and impedor 46c and diode 48c are connected in parallel.Specifically, the positive pole of diode 48c is connected with node between impedor 46c and the capacity cell 47c, and the negative pole of diode 48c is connected with the other end of impedor 46c.
Equally, absorb circuit 45d and have impedor 46d, capacity cell 47d and diode 48d.Impedor 46d and capacity cell 47d are connected in series, and impedor 46d and diode 48d are connected in parallel.Specifically, the positive pole of diode 48d is connected with node between impedor 46d and the capacity cell 47d, and the negative pole of diode 48d is connected with the other end of impedor 46d.
At the crane magnet driving circuit 1B of the 3rd embodiment, also can access the advantage identical with the crane magnet driving circuit 1A of the 2nd embodiment.
In the present embodiment, because the 2nd～the 4th on-off element 41b～41d is a contact switch, therefore when the switching of conducting state and nonconducting state, produces arc discharge sometimes, and produce big arc voltage.
But, crane magnet driving circuit 1B according to the 3rd embodiment, because the H bridge circuit 4B of portion has respectively absorption circuit 45b, 45c, the 45d that is connected in parallel with the 2nd～the 4th on-off element 41b～41d, therefore absorb circuit 45b, 45c, 45d by these, the N/R arc voltage that the 2nd～the 4th on-off element 41b～41d produces can be absorbed in respectively, and the controlled of lifting magnet 2 can be improved.
In addition, the invention is not restricted to above-mentioned embodiment, various distortion can be arranged.When carrying out the excitation of lifting magnet 2, also can make the 4th on-off element 41d replace the 1st on-off element 41a to carry out switch motion.In this case, use noncontacting switch, use contact switch at the 1st on-off element 41a at the 4th on-off element 41d.
In addition, using under the situation of IGBT as noncontacting switch, the IC that carries 2 IGBT has sale on market, can realize low price when using this IC.At this moment, be not only the 1st on-off element 41a, any among the 2nd～the 4th on-off element 41b～41d also can be used IGBT.
In addition, as long as diode 48b, 48c, 48d among the 1st～the 4th diode 42a～42d of the diode 31a～31f of DC converting portion 3, H bridge circuit portion 4 and the 45b of energy absorbing portion, 45c, the 45d have unidirectional rectification function, then also can replace with the element beyond the diode.
In present embodiment, as the 45b of energy absorbing portion, 45c, 45d and illustration the CRD type absorb circuit, but the 45b of energy absorbing portion, 45c, 45d are not limited to present embodiment.For example, also can be the absorption circuit that only constitutes by capacity cell (C), also can be the absorption circuit that constitutes by capacity cell and impedor (R).
Claims (4)
1, a kind of crane magnet driving circuit carries out the excitation and the demagnetization of lifting magnet, it is characterized in that,
Have H bridge circuit portion,
This H bridge circuit portion comprises: the 1st and the 2nd on-off element, between hot side power supply and low potential side power supply, be connected in series successively, and the node between the described the 1st and the 2nd on-off element is connected with an end of described lifting magnet; The the 3rd and the 4th on-off element is connected in series between described hot side power supply and described low potential side power supply successively, and the node between the described the 3rd and the 4th on-off element is connected with the other end of described lifting magnet; And the 1st～the 4th rectifier cell, being connected in parallel with described the 1st～the 4th on-off element respectively, this H bridge circuit portion controls the excitation and the demagnetization of described lifting magnet,
When carrying out the excitation of described lifting magnet, after the described the 1st and the 4th on-off element conducting, some in the described the 1st and the 4th on-off element carries out switch motion,
In described the 1st～the 4th on-off element, the on-off element that carries out described switch motion at least is a noncontacting switch, and at least one of other on-off element is contact switch.
2, crane magnet driving circuit as claimed in claim 1 is characterized in that,
Described H bridge circuit portion also have with the described the 1st and the 4th on-off element in the 5th on-off element that is connected in parallel of the on-off element that carries out described switch motion,
Described the 5th on-off element is a contact switch.
3, crane magnet driving circuit as claimed in claim 1 is characterized in that,
Described H bridge circuit portion also have with the 1st and the 4th on-off element in the circuit breaker that is connected in series of the on-off element that carries out described switch motion.
4, crane magnet driving circuit as claimed in claim 1 is characterized in that,
Described H bridge circuit portion also have with the 1st～the 4th on-off element in use the energy absorbing portion that is connected in parallel of the on-off element of contact switch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008055308A JP2009208931A (en) | 2008-03-05 | 2008-03-05 | Lifting magnet driving circuit |
| JP055308/2008 | 2008-03-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101525105A true CN101525105A (en) | 2009-09-09 |
| CN101525105B CN101525105B (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101269283A Expired - Fee Related CN101525105B (en) | 2008-03-05 | 2009-03-05 | Suspended magnet driving circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2009208931A (en) |
| CN (1) | CN101525105B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897642A (en) * | 2011-07-26 | 2013-01-30 | 宝山钢铁股份有限公司 | Capacitor inversion type magnetizing and demagnetizing lifting electromagnet |
| CN103986448A (en) * | 2014-05-28 | 2014-08-13 | 苏州工业职业技术学院 | Drive inductor of refrigerator electromagnetic door |
| CN106373702A (en) * | 2016-10-10 | 2017-02-01 | 沈阳航空航天大学 | IGBT non-contact lifting electromagnet control system for non-rectifying transformer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066877B (en) * | 2013-01-23 | 2016-01-13 | 山东大学 | The unbalanced high-frequency isolation type inverter of a kind of anti-threephase load |
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| JPS61156491U (en) * | 1985-03-20 | 1986-09-27 | ||
| EP0262521B1 (en) * | 1986-09-30 | 1991-04-17 | Siemens Aktiengesellschaft | Device for controlling the electrical voltage at the rotating exciter winding of an electrical generator |
| JPH06104289B2 (en) * | 1988-07-20 | 1994-12-21 | フジ磁工株式会社 | Degaussing device for electromagnetic chuck |
| CN2311480Y (en) * | 1997-09-23 | 1999-03-24 | 南京腾飞自动化设备厂 | Lifting electromagnet controller |
| CN2543933Y (en) * | 2002-05-16 | 2003-04-09 | 岳阳科美达机器有限公司 | Contactless electric control equipment for lifting electromagnet |
| JP4335198B2 (en) * | 2005-10-27 | 2009-09-30 | 住友重機械工業株式会社 | Lifting magnet drive circuit |
| JP2007301703A (en) * | 2006-05-15 | 2007-11-22 | Ryobi Ltd | Electric power tool |
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2008
- 2008-03-05 JP JP2008055308A patent/JP2009208931A/en active Pending
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2009
- 2009-03-05 CN CN2009101269283A patent/CN101525105B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897642A (en) * | 2011-07-26 | 2013-01-30 | 宝山钢铁股份有限公司 | Capacitor inversion type magnetizing and demagnetizing lifting electromagnet |
| CN102897642B (en) * | 2011-07-26 | 2014-10-01 | 宝山钢铁股份有限公司 | Capacitor inversion type magnetizing and demagnetizing lifting electromagnet |
| CN103986448A (en) * | 2014-05-28 | 2014-08-13 | 苏州工业职业技术学院 | Drive inductor of refrigerator electromagnetic door |
| CN106373702A (en) * | 2016-10-10 | 2017-02-01 | 沈阳航空航天大学 | IGBT non-contact lifting electromagnet control system for non-rectifying transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101525105B (en) | 2012-07-25 |
| JP2009208931A (en) | 2009-09-17 |
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