CN101244788A - Crane magnet driving circuit - Google Patents
Crane magnet driving circuit Download PDFInfo
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- CN101244788A CN101244788A CNA2007100051978A CN200710005197A CN101244788A CN 101244788 A CN101244788 A CN 101244788A CN A2007100051978 A CNA2007100051978 A CN A2007100051978A CN 200710005197 A CN200710005197 A CN 200710005197A CN 101244788 A CN101244788 A CN 101244788A
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Abstract
The invention provides a lifting magnet drive circuit which can be minimized and has high reliability, comprising the following parts: a direct current transforming part (3) which transforms the AC supply voltage VAC1 to VAC3 into the DC supply voltage VDC; an H-shaped bridge circuit (4) controlling the excitation current direction of the lifting magnet (2); a transistor (51) and a resistance element (53) which are connected in series and a capacitor (54) connected in parallel with the transistor (51) and the resistance element (53), an energy absorbing unit (5) absorbing the energy stored in the lifting magnet (2) when changing the excitation current direction; a control unit (6) which controls the conducting state of the energy absorbing unit (5) transistor (51) according to the direction and size of the current flowing through the positive power cord (7) between the H-shaped bridge circuit (4) and the energy absorbing unit (5) and the potential difference between the positive power cord (7) and the negative power cord (8).
Description
Technical field
The present invention relates to crane magnet driving circuit.
Background technology
Generally, we know in cargo handling operation or the constructions work etc. and mention the lifting magnet that iron plate is used.Lifting magnet also is loaded on the vehicle except the equipment as factory etc. sometimes.When using lifting magnet, the electric current that flows through a certain direction makes the lifting magnet excitation, and the sorption iron plate is mentioned.And when putting down iron plate, flow through rightabout electric current with the lifting magnet demagnetization.
Fig. 3 drives the circuit diagram of the circuit of the prior art that lifting magnet uses for expression.Driving circuit 100 possesses AC supply voltage with three-phase alternating-current supply ACG output and is transformed into the DC converting portion 101 that is made of a plurality of diode 101a of direct supply voltage and is connected with this DC converting portion 101, and control flows is crossed the H type bridge circuit 103 of the flow direction of the exciting current of lifting magnet 102.Dispose 4 transistor 103a～103d in the H type bridge circuit 103, in Fig. 3, when transistor 103a and 103d conducting, flow through electric current I in the lifting magnet 102
AAnd when transistor 103b and 103c conducting, flow through and electric current I in the lifting magnet 102
AFlow to opposite electric current I
B
When the electric current that flows through in the lifting magnet 102 stops, the energy of size to a certain degree that the savings counter electromotive force causes in the lifting magnet.Therefore, in order to switch the flow direction of the electric current that flows through in the lifting magnet 102 fast, be necessary to discharge expeditiously the energy of this savings.Therefore in driving circuit 100, configuration diode 104a～104d between collecting electrode-emitter of each transistor 103a～103d of H type bridge circuit 103.And, with H type bridge circuit 103 conies 105 that dispose in parallel.Thus, when for example transistor 103a and 103d became non-on-state after on-state, the electric current that the savings energy produces was absorbed the direct current power that uses when becoming once more excitation from lifting magnet 102 through diode 104c by cond 105.
In addition, other examples as the circuit that drives lifting magnet have patent documentation 1,2 disclosed examples.
[patent documentation 1] TOHKEMY 2000-143138
[patent documentation 2] TOHKEMY 2002-359112
But there is following problem in driving circuit 100 shown in Figure 3.For example, under lifting magnet and actuating device thereof are installed to situation on the vehicle,, require actuating device to want further miniaturization for observability or the Design freedom that does not hinder vehicle.In addition, owing to flow through greatly big electric current in the lifting magnet to tens amperes (for example 70A), therefore the cond 105 that absorption savings energy is used in the driving circuit 100 shown in Figure 3 must be the electric capacity of high capacity (for example 0.18F), and the actuating device that driving circuit 100 is installed has been maximized.
In addition, for problem such in the driving circuit that solves prior art, for example the circuit put down in writing of patent documentation 1 possesses and H type bridge circuit rheostat in parallel, and possesses be connected in parallel and be one another in series with this rheostat bonded assembly resistance unit and switch.Therefore, absorb the savings energy of lifting magnet by rheostat and resistance unit.But because the switch that time control is connected with resistance unit and is provided with in this circuit, it is excessive therefore to flow through the rheostatic magnitude of current before switch connection, and the danger that rheostat is destroyed is arranged, and has reliability problems.
Summary of the invention
The present invention is exactly in view of the above problems, its objective is to provide a kind of can miniaturization and have a crane magnet driving circuit of high reliability.
In order to address the above problem, crane magnet driving circuit of the present invention, be used for providing exciting current to lifting magnet, it is characterized in that, possess: the AC supply voltage that source of AC is provided is transformed into direct supply voltage, and this direct supply voltage is offered DC converting portion between positive side mouth and the minus side mouth; The positive side power lead that is electrically connected with the positive side mouth of DC converting portion; The minus side power lead that is electrically connected with the minus side mouth of DC converting portion; Be connected electrically between positive side power lead and the minus side power lead, comprise at least 4 transistors in the structure and be connected electrically at least 4 rectifier cells between this transistorized each collecting electrode-emitter of at least 4, control is to the H type bridge circuit of the direction of the exciting current of lifting magnet; Have and be connected electrically between positive side power lead and the minus side power lead, and the capacity cell that is one another in series bonded assembly resistance unit and on-off element and is connected in parallel with respect to resistance unit and on-off element absorbs the energy absorption units of the energy of savings in lifting magnet when the switched energization sense of current; Measure the current measuring unit of the sense of current that flows through in the positive side power lead between H type bridge circuit and the energy absorption units and size and measure at least one measuring unit in the potential difference measurement unit of the difference of potential between positive side power lead and the minus side power lead; And, according to the control unit of the conducting state of the on-off element of at least one the result of a measurement control energy absorptive unit in sense of current and size and the difference of potential.
Above-mentioned crane magnet driving circuit moves like this.At first, 2 transistor turns at least 4 transistors of H type bridge circuit, the electric current electric current (exciting current) from DC converting portion flows through positive side power lead, lifting magnet and minus side power lead successively thus.Then, when transistor becomes obstructedly, exciting current stops, when producing the savings energy in the lifting magnet, the electric current that this savings energy produces by rectifier cell and just the side power lead flow to energy absorption units.At this moment, in the blink before control unit makes the on-off element conducting of energy absorption units, the current direction capacity cell that the savings energy produces.Then, when control unit made the on-off element conducting of energy absorption units, the electric current that the savings energy produces had been consumed by resistance unit basically.Therefore,, compare,, therefore can make the actuating device miniaturization owing to can reduce the capacity of capacity cell significantly with the driving circuit of prior art for example shown in Figure 3 if adopt above-mentioned crane magnet driving circuit.
And as mentioned above, the electric current that the savings energy produces flows to energy absorption units by positive side power lead.Therefore, crane magnet driving circuit is measured sense of current and size that this savings energy produces by possessing current measuring unit in positive side power lead, and the generation of can precision knowing the electric current that the savings energy produces well constantly or disappear the moment.And when putting aside the current direction capacity cell of energy generation, the voltage at these capacity cell two ends increases gradually.Therefore, crane magnet driving circuit possesses the potential difference measurement unit, by the difference of potential measured between positive side power lead and the minus side power lead is the both end voltage of capacity cell, and the generation of can precision knowing the electric current that the savings energy produces well constantly or disappear constantly.If adopt above-mentioned crane magnet driving circuit, because the conducting state of at least one result of a measurement in the size and Orientation of the electric current that control unit is measured according to current measuring unit and the difference of potential that the potential difference measurement unit is measured, the on-off element of control energy absorptive unit, therefore control unit can become in the both end voltage of capacity cell and makes the on-off element conducting, the current direction resistance unit that the savings energy is produced before excessive.Thus, can provide the high crane magnet driving circuit of being put down in writing in reliability ratio such as the patent documentation 1 of circuit.
And, also can be that crane magnet driving circuit possesses current measuring unit, when producing in the positive side power lead when H type bridge circuit flows to the electric current of energy absorption units, control unit makes the on-off element conducting.Perhaps also can be that crane magnet driving circuit possesses the potential difference measurement unit, when the difference of potential between positive side power lead and the minus side power lead reaches predetermined the 1st threshold value when above, control unit makes the on-off element conducting.If adopt these crane magnet driving circuits, the generation of can precision grasping the electric current that the savings energy produces well constantly, the electric current that the savings energy is produced in time flows to the resistance unit of energy absorption units.
And, also can be that crane magnet driving circuit possesses current measuring unit, after the on-off element conducting, when the size of electric current that flows to energy absorption units from H type bridge circuit in the positive side power lead when the 2nd predetermined threshold value is following, control unit makes on-off element obstructed.Perhaps also can be that crane magnet driving circuit possesses the potential difference measurement unit; After the on-off element conducting, when the difference of potential between positive side power lead and the minus side power lead when the 3rd predetermined threshold value is following, control unit makes on-off element obstructed.If adopt these crane magnet driving circuits, the disappearance of can precision grasping the electric current that the savings energy produces well can make apace with the oppositely directed erasing current of exciting current and flow to lifting magnet constantly.
The effect of invention: if adopt the present invention, can provide a kind of can miniaturization and have a crane magnet driving circuit of high reliability.
Description of drawings
Fig. 1 is the circuit diagram of structure of an embodiment of expression crane magnet driving circuit of the present invention.
(a) is applied to the diagram of curves of time waveform of the voltage at lifting magnet two ends among Fig. 2 for expression; (b) be the H type bridge circuit of expression in the positive side power lead and the diagram of curves of the time waveform of the magnitude of current between the energy absorption units; (c) be the diagram of curves of the time waveform of the difference of potential between positive side power lead of expression and the minus side power lead.
Fig. 3 is the circuit diagram that expression drives the circuit of the prior art that lifting magnet uses.
The specific embodiment
Describe the embodiment of crane magnet driving circuit of the present invention with reference to the accompanying drawings in detail.In addition, in description of drawings, same key element is added identical Reference numeral, omits repeat specification.And, in the following description, transistor comprise bipolar transistor and FET (FET) the two.When transistor was FET, base stage renamed as grid, and collecting electrode renames as drain electrode, and emitter renames as source electrode.
Fig. 1 is the circuit diagram of the structure of an embodiment of expression crane magnet driving circuit of the present invention.If with reference to Fig. 1, the crane magnet driving circuit of present embodiment (hereinafter referred to as " magnet drives circuit ") the 1st, the circuit to lifting magnet 2 provides exciting current to use possesses: DC converting portion 3, H type bridge circuit 4, energy absorption units 5, control unit 6, positive side power lead 7, minus side power lead 8, current measuring unit 9 and potential difference measurement unit 10.
The AC supply voltage V of DC converting portion 3 for three-phase alternating-current supply ACG is provided
AC1～V
AC3Be transformed into direct supply voltage V
DCCircuit part.DC converting portion 3 has positive side mouth 3a and minus side mouth 3b, with the direct supply voltage V that generates
DCOffer between positive side mouth 3a and the minus side mouth 3b.
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.Be specially, diode 31a and 31b among diode 31a～31f are connected in series, and diode 31c and 31d are connected in series, and diode 31e and 31f are connected in series.And the group that the group that diode 31a and 31b constitute, diode 31c and 31d constitute, the group that constitutes with diode 31e and 31f are connected in parallel mutually.And an end of the cathode side of these diode groups is electrically connected with positive side mouth 3a, and the other end of anode-side is electrically connected with minus side mouth 3b.
And, between diode 31a and the diode 31b, be electrically connected with the AC power cord 11a that the phase terminals for power supplies from three-phase alternating-current supply ACG extends.Be electrically connected with another the AC power cord 11b that extends of terminals for power supplies mutually from three-phase alternating-current supply ACG between diode 31c and the diode 31d.Be electrically connected with another the AC power cord 11c that extends of terminals for power supplies mutually again from three-phase alternating-current supply ACG between diode 31e and the diode 31f.In addition, AC transform circuit can also or use the mixed electrical bridge circuit of diode and silicon controlled rectifier to constitute by the pure bridge circuit that has for example used silicon controlled rectifier in addition.Under the situation that DC transfer circuit is made of pure bridge circuit or mixed electrical bridge circuit, silicon controlled rectifier by do not have among the figure expression phase control circuit in expectant control angle inner control phase place.
Positive side power lead 7 and the distribution of minus side power lead 8 for providing exciting current to use for lifting magnet 2.One end of positive side power lead 7 is electrically connected with the positive side mouth 3a of DC converting portion 3.And an end of minus side power lead 8 is electrically connected with the minus side mouth 3b of DC converting portion 3.
H type bridge circuit 4 is a circuit part of controlling the direction of the exciting current that offers lifting magnet 2.H type bridge circuit 4 is by comprising 4 npn transistor npn npn 41a～41d, be connected electrically in 4 diodes (rectifier cell) 42a～42d between each collecting electrode-emitter of these 4 transistor 41a～41d, connect the electric wire 12a that exciting current is provided for lifting magnet 2 and the terminal 43a of 12b and the H type bridge circuit of 43b and constitute.
Be specially, the collecting electrode of transistor 41a is electrically connected with positive side power lead 7, and the emitter of transistor 41a is electrically connected with terminal 43a.The collecting electrode of transistor 41b is electrically connected with terminal 43a, and the emitter of transistor 41b is electrically connected with minus side power lead 8.The collecting electrode of transistor 41c is electrically connected with positive side power lead 7, and the emitter of transistor 41c is electrically connected with terminal 43b.The collecting electrode of transistor 41d is electrically connected with terminal 43b, and the emitter of transistor 41d is electrically connected with minus side power lead 8.And the anode of diode 42a～42d is electrically connected with the emitter of transistor 41a～41d respectively, and the negative electrode of diode 42a～42d is electrically connected with the collecting electrode of transistor 41a～41d respectively.
Do not have the control circuit of expression to be electrically connected among the base stage of each transistor 41a～41d and the figure, the control current that the state of conducting is provided by this control circuit between collecting electrode-emitter of each transistor 41a～41d (or control voltage) is controlled.For example, when the base stage of giving transistor 41a and 41d provides control current, positive exciting current I
1Flow through transistor 41a, terminal 43a, lifting magnet 2, terminal 43b and transistor 41d successively.Perhaps, when the base stage of giving transistor 41b and 41c provides control current, contrary excitation (demagnetization) electric current I
2Flow through transistor 41c, terminal 43b, lifting magnet 2, terminal 43a and transistor 41b successively (that is, with positive exciting current I
1The flow direction opposite).
Transistor 51 and resistance unit 53 are connected electrically between positive side power lead 7 and the minus side power lead 8, and the connection that is one another in series.Be specially, the collecting electrode of transistor 51 is connected electrically on the positive side power lead 7, and the emitter of transistor 51 is connected electrically on the end of resistance unit 53.And the other end of resistance unit 53 is connected electrically on the minus side power lead 8.Be electrically connected the negative electrode and the anode of diode 52 on the collector and emitter of transistor 51 respectively.And cond 54 is connected in parallel with transistor 51 and resistance unit 53.In addition, provide on the base stage of transistor 51 from the control current I of control unit 6 outputs described later
3(or control voltage) is by this control current I
3Conducting state between the collecting electrode-emitter of control transistor 51.And resistance unit 53 also can make up a plurality of resistance units according to the resistance value or the withstand voltage serial or parallel connection of necessity.Cond 54 can as required capacitance or withstand voltage serial or parallel connection make up a plurality of conies too.
The circuit part that potential difference measurement unit 10 is used for the difference of potential of measuring between positive side power lead 7 and the minus side power lead 8.Potential difference measurement unit 10 has the potential difference signal S of output as the expression difference of potential of result of a measurement
VMouth 10a.Mouth 10a is electrically connected with control unit 6, potential difference signal S is provided for control unit 6
V
In addition, though the magnet drives circuit 1 of present embodiment possess simultaneously current measuring unit 9 and potential difference measurement unit 10 the two, magnet drives circuit 1 also can only possess in current measuring unit 9 and the potential difference measurement unit 10.
And, under the situation of transistor 51 conductings, as size (the current signal S that flows to the electric current of energy absorption units 5 from H type bridge circuit 4
I) when the 2nd predetermined threshold value was following, control unit 6 stopped control current I
3Output, make become between the collecting electrode-emitter of transistor 51 obstructed.Perhaps, under the situation of transistor 51 conductings, difference of potential (the potential difference signal S between positive side power lead 7 and minus side power lead 8
V) when the 3rd predetermined threshold value was following, control unit 6 stopped control current I
3Output, make become between the collecting electrode-emitter of transistor 51 obstructed.
The following describes the action of the magnet drives circuit 1 of present embodiment.Fig. 2 (a)～(c) is respectively expression and is applied to the magnitude of current (Fig. 2 (b)) between the H type bridge circuit 4 and energy absorption units 5 in the voltage (being the voltage between terminal 43a and the terminal 43b) (Fig. 2 (a)) at lifting magnet 2 two ends, the positive side power lead 7 and the diagram of curves of the time waveform separately of the difference of potential (Fig. 2 (c)) between side power lead 7 and the minus side power lead 8 just.In addition, the magnitude of current in Fig. 2 (b) is a forward with the current direction that flows to energy absorption units 5 from H type bridge circuit 4.
At first, at t0 sometime, three-phase alternating-current supply ACG is driven, thus, and three-phase alternating-current supply voltage V
AC1～V
AC3Be provided for AC power cord 11a～11c.These three-phase alternating-current supply voltage V
AC1～V
AC3Be transformed into direct supply voltage V by DC converting portion 3
DC, direct supply voltage V
DCOffer (with reference to Fig. 2 (c)) between positive side power lead 7 and the minus side power lead 8.
Then, at moment t1, lifting magnet 2 is by excitation.That is, there is not the control circuit of expression to make the transistor 41a and the 41d conducting of H type bridge circuit 4 among the figure.Thus, positive exciting current I
1Flow through positive side power lead 7, transistor 41a, lifting magnet 2, transistor 41d and minus side power lead 8 (with reference to Fig. 2 (b)) successively.That is, positive field voltage V exports between the terminal 43a and terminal 43b of H type bridge circuit 4 (with reference to Fig. 2 (a)).Thus, lifting magnet 2 can be mentioned by the sorption iron plate by excitation.
Then, transfer to the action that discharges iron plates etc. from lifting magnet 2.At first, at t2 sometime, eliminate the excitation of lifting magnet 2.That is, there is not the control circuit of expression to make the transistor 41a of H type bridge circuit 4 and 41d become obstructed among the figure.At this moment, the energy of savings in lifting magnet 2 produces the voltage (the A part among Fig. 2 (a)) that counter electromotive force causes at the two ends of lifting magnet 2 (being between terminal 43a and the terminal 43b).Simultaneously, the electric current (with reference to the B part of Fig. 2 (b)) that causes of this counter electromotive force flows through diode 42b, lifting magnet 2 and diode 42c.
At this moment, in the blink before control unit 6 makes transistor 51 conductings of energy absorption units 5, the cond 54 of the current direction energy absorption units 5 that the savings energy produces.So the voltage at cond 54 two ends rises, make the difference of potential rising (the C part of Fig. 2 (c)) between positive side power lead 7 and the minus side power lead 8 thus.
When the electric current that produces when the savings energy flow through positive side power lead 7, this electric current flowed to energy absorption units 5 from H type bridge circuit 4, the flow direction counter-rotating of electric current in the therefore positive side power lead 7.Control unit 6 is by current signal S
IIdentification has produced the electric current that flows to energy absorption units 5 from H type bridge circuit 4, and the electric current of identification savings energy generation flows through positive side power lead 7 (the P1 point of Fig. 2 (b)) thus.Then, control unit 6 output control current I3 make conducting between the collecting electrode-emitter of transistor 51.Thus, the electric current that the savings energy produces flows to resistance unit 53 by transistor 51, is consumed in resistance unit 53, gradually decay.
Perhaps, because the current direction cond 54 that the savings energy produces rises the voltage at cond 54 two ends, so control unit 6 also can be by the difference of potential between positive side power lead 7 and the minus side power lead 8 at the 1st predetermined threshold value V
Th1More than (i.e. potential difference signal S by potential difference measurement unit 10 output
VMore than predetermined threshold value) electric current that produces of identification savings energy flows through positive side power lead 7 (the P2 point of Fig. 2 (c)).In this case, control unit 6 output control current I
3, make conducting between the collecting electrode-emitter of transistor 51.
Then, as size (the current signal S that flows to the electric current of energy absorption units 5 from H type bridge circuit 4
I) at the 2nd predetermined threshold value I
Th2) when following (the P3 point of Fig. 2 (b)), control unit 6 recognizes the electric current that the savings energy produces and fully decayed.So control unit 6 stops control current I
3Output, make between the collecting electrode-emitter of transistor 51 obstructed.In addition, Yu Ding the 2nd threshold value I
Th2Preferred as close as possible 0[A] value.
Perhaps, also can be by the difference of potential between positive side power lead 7 and the minus side power lead 8 at the 3rd predetermined threshold value V
Th3Below (i.e. potential difference signal S by potential difference measurement unit 10 output
VBelow predetermined threshold value) discern the electric current of savings energy generation by fully decay (the P4 point of Fig. 2 (c)).In this case, control unit 6 stops control current I
3Output make between the collecting electrode-emitter of transistor 51 obstructed.
Then, at moment t3, with lifting magnet 2 demagnetizations.Promptly make the transistor 41b and the 41c conducting of H type bridge circuit 4 with the control circuit of not representing among the figure.Thus, contrary exciting current I
2Flow through positive side power lead 7, transistor 41c, lifting magnet 2, transistor 41b and minus side power lead 8 (with reference to Fig. 2 (b)) successively.That is, give contrary excitation (demagnetization) voltage-V (with reference to Fig. 2 (a)) of output between the terminal 43a of H type bridge circuit 4 and the terminal 43b.Thus, lifting magnet 2 can be discharged the iron plate of sorption etc. by demagnetization.
Demagnetization makes the transistor 41b and the 41c of H type bridge circuit 4 obstructed at moment t4 after finishing.At this moment, produce the voltage (with reference to the D part of Fig. 2 (a)) that counter electromotive force produces at the two ends of lifting magnet 2 (being between terminal 43a and the terminal 43b) by the energy of savings in lifting magnet 2.Simultaneously, the electric current (the E part of Fig. 2 (b)) of this counter electromotive force generation flows through diode 42d, lifting magnet 2 and diode 42a.The electric current that this savings energy produces is the same with above-mentioned action to be absorbed by energy absorption units 5 and control unit 6.
The following describes the effect of the magnet drives circuit 1 of present embodiment.The energy of savings in lifting magnet 2 nearly all consumed by resistance unit 53 in the magnet drives circuit 1.Therefore, all put aside the driving circuit of the prior art in the cond with this energy and compare, can reduce the capacity of cond 54 significantly.Lift an example, be applicable to that the capacity of cond 54 of the magnet drives circuit 1 of present embodiment is for example 2000[μ F].And the necessary capacity of cond is for example 0.18[F in the driving circuit of prior art].So, if adopt the magnet drives circuit 1 of present embodiment,, therefore can make the miniaturization by leaps and bounds of solenoid actuated device owing to can reduce capacitor volume significantly.And this miniaturization of solenoid actuated device can be loaded on for example small-sized rotary-type construction vehicle it, and also can not hinder the observability from operator's compartment.
And, if adopt the magnet drives circuit 1 of present embodiment, by the flow direction or the size of the electric current of measurement savings energy generation in current measuring unit 9, can in control unit 6, precision know the generation moment (the some P1 of Fig. 2 (b)) of the electric current that the savings energy produces or the disappearance moment (the some P3 among Fig. 2 (b)) after the decay well.Be the both end voltage of cond 54 perhaps, can in control unit 6, precision know the generation moment (the some P2 of Fig. 2 (c)) of the electric current that the savings energy produces or the disappearance moment (the some P4 among Fig. 2 (c)) after the decay well by the difference of potential between positive side power lead 7 of measurement and the minus side power lead 8 in potential difference measurement unit 10.And, because control unit 6 is according to the size and Orientation of the electric current of current measuring unit 9 measurements, and the conducting state of the transistor 51 of at least one the result of a measurement control energy absorptive unit 5 in the difference of potential of potential difference measurement unit 10 measurements, therefore control unit 6 can become in the both end voltage of cond 54 and makes transistor 51 conductings, the current direction resistance unit 53 that the savings energy is produced before excessive.Thus, can reduce the burden of cond 54, can provide reliability high magnet drives circuit 1.
And preferably as present embodiment, magnet drives circuit 1 possesses current measuring unit 9, and when having produced in the positive side power lead 7 when H type bridge circuit 4 flows to the electric current of energy absorption units 5, control unit 6 makes transistor 51 conductings.Perhaps, also can be that magnet drives circuit 1 possesses potential difference measurement unit 10, the difference of potential between positive side power lead 7 and minus side power lead 8 reaches the 1st predetermined threshold value V
Th1When above, control unit 6 makes transistor 51 conductings.Thus, the generation of can precision grasping the electric current that the savings energy produces well constantly, the electric current that the savings energy is produced in time flows to the resistance unit 53 of energy absorption units 5.
And preferably magnet drives circuit 1 possesses current measuring unit 9 as present embodiment, after transistor 51 is switched on, flows to the size of electric current of energy absorption units 5 at the 2nd predetermined threshold value I from H type bridge circuit 4 in positive side power lead 7
Th2When following, control unit 6 makes transistor 51 obstructed.Perhaps, also can be that magnet drives circuit 1 possesses potential difference measurement unit 10, after transistor 51 was switched on, the difference of potential between positive side power lead 7 and minus side power lead 8 was at the 3rd predetermined threshold value V
Th3When following, control unit 6 makes transistor 51 obstructed.Thus, the disappearance of can precision grasping the electric current that the savings energy produces well can make the oppositely directed contrary exciting current I with positive exciting current I1 constantly apace
2Flow to lifting magnet 2.
Crane magnet driving circuit of the present invention is not limited to above-mentioned embodiment, can do all distortion.For example, though the on-off element that uses transistor that the npn transistor npn npn had as H type bridge circuit and energy absorption units to be had in the above-mentioned embodiment also can use the pnp transistor npn npn.And though the crane magnet driving circuit of above-mentioned embodiment has and the corresponding DC converting of three-phase alternating-current supply portion, DC converting portion also can be and the corresponding structures of other forms of source of AC such as 6 cross streams power supplys.
Claims (5)
1. a crane magnet driving circuit is used for providing exciting current to lifting magnet, it is characterized in that possessing:
The AC supply voltage that source of AC is provided is transformed into direct supply voltage, and this direct supply voltage is offered DC converting portion between positive side mouth and the minus side mouth; The positive side power lead that is electrically connected with the above-mentioned positive side mouth of above-mentioned DC converting portion; The minus side power lead that is electrically connected with the above-mentioned minus side mouth of above-mentioned DC converting portion; Be connected electrically between above-mentioned positive side power lead and the above-mentioned minus side power lead, comprise at least 4 transistors in the structure and be connected electrically at least 4 rectifier cells between this transistorized each collecting electrode-emitter of at least 4, control is to the H type bridge circuit of the direction of the above-mentioned exciting current of above-mentioned lifting magnet; Have and be connected electrically between above-mentioned positive side power lead and the above-mentioned minus side power lead, and the capacity cell that is one another in series bonded assembly resistance unit and on-off element and is connected in parallel with respect to above-mentioned resistance unit and above-mentioned on-off element absorbs the energy absorption units of the energy of savings in above-mentioned lifting magnet when switching the direction of above-mentioned exciting current; Measure the current measuring unit of the sense of current that flows through in the above-mentioned positive side power lead between above-mentioned H type bridge circuit and the above-mentioned energy absorption units and size and measure at least one measuring unit in the potential difference measurement unit of the difference of potential between above-mentioned positive side power lead and the above-mentioned minus side power lead; And, control the control unit of conducting state of the above-mentioned on-off element of above-mentioned energy absorption units according at least one result of a measurement in above-mentioned sense of current and size and the above-mentioned difference of potential.
2. crane magnet driving circuit as claimed in claim 1 is characterized in that, possesses above-mentioned current measuring unit; When having produced in the above-mentioned positive side power lead when above-mentioned H type bridge circuit flows to the electric current of above-mentioned energy absorption units, above-mentioned control unit makes above-mentioned on-off element conducting.
3. crane magnet driving circuit as claimed in claim 1 is characterized in that, possesses above-mentioned potential difference measurement unit; When above-mentioned difference of potential between above-mentioned positive side power lead and the above-mentioned minus side power lead has reached predetermined the 1st threshold value when above, above-mentioned control unit makes above-mentioned on-off element conducting.
4. as each the described crane magnet driving circuit in the claim 1～3, it is characterized in that possessing above-mentioned current measuring unit; After above-mentioned on-off element conducting, when the size that flows to the above-mentioned electric current of above-mentioned energy absorption units from above-mentioned H type bridge circuit in the above-mentioned positive side power lead becomes the 2nd predetermined threshold value when following, above-mentioned control unit makes above-mentioned on-off element obstructed.
5. as each the described crane magnet driving circuit in the claim 1～3, it is characterized in that possessing above-mentioned potential difference measurement unit; After above-mentioned on-off element conducting, when the above-mentioned difference of potential between above-mentioned positive side power lead and the above-mentioned minus side power lead becomes the 3rd predetermined threshold value when following, above-mentioned control unit makes above-mentioned on-off element obstructed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100051978A CN101244788B (en) | 2007-02-15 | 2007-02-15 | Crane magnet driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100051978A CN101244788B (en) | 2007-02-15 | 2007-02-15 | Crane magnet driving circuit |
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| CN101244788A true CN101244788A (en) | 2008-08-20 |
| CN101244788B CN101244788B (en) | 2010-06-09 |
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| CN2007100051978A Expired - Fee Related CN101244788B (en) | 2007-02-15 | 2007-02-15 | Crane magnet driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857164A (en) * | 2009-07-07 | 2010-10-13 | 岳阳中南电磁科技有限公司 | Intelligent contactless direct current control power supply for lifting electromagnet |
| 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 |
| CN104176616A (en) * | 2013-05-21 | 2014-12-03 | 住友重机械工业株式会社 | Power supply circuit for lifting magnet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3395145B2 (en) * | 2000-03-17 | 2003-04-07 | 住友重機械工業株式会社 | Lifting magnet device |
-
2007
- 2007-02-15 CN CN2007100051978A patent/CN101244788B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857164A (en) * | 2009-07-07 | 2010-10-13 | 岳阳中南电磁科技有限公司 | Intelligent contactless direct current control power supply for lifting electromagnet |
| 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 |
| CN104176616A (en) * | 2013-05-21 | 2014-12-03 | 住友重机械工业株式会社 | Power supply circuit for lifting magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101244788B (en) | 2010-06-09 |
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