JPS6049614A - Driving device for electromagnetic device - Google Patents

Abstract

PURPOSE:To contrive to enhance the acting speed of an electromagnetic device, and to reduce the holding current thereof by a method wherein after a driving current is flowed for the prescribed times corresponding to intput of an exciting signal, the driving current is made intermittently according to pulse output. CONSTITUTION:A switch 26 is closed to the B side when a signal X applied to an input terminal 6 is a low level. Output of a pulse generator 16 becomes to a high level for the prescribed times when the signal X becomes to a high level. A high level signal is applied to the base of a transistor 20 during the prescribed times thereof, and a driving current is supplied to an electromagnetic device 2. After the prescribed times are elapsed, the switch 26 is changed over the A side. After the switch 26 is changed over the A side, an intermittent signal is applied from an oscillator 23 to the base of the transistor 20 to suppress low the current to flow in the electromagnetic device 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving device for an electromagnetic device such as a solenoid valve or an electromagnetic switch.

Such electromagnetic devices are commonly used in various industrial fields. This electromagnetic device includes an excitation winding and a movable piece that is actuated by the excitation of the excitation winding, and the operation of the movable piece switches a fluid valve, opens and closes an electric circuit, etc. Excitation of the excitation winding is performed by supplying current from the power supply,
For this purpose, a terminal to which a power supply voltage is applied is connected to one end of the excitation winding, and a switching element is connected to the other end, and the switching element is made conductive by a signal to supply current to the excitation winding. Such a drive circuit will be explained with reference to the drawings.

FIG. 1 is a circuit diagram of a conventional drive circuit for an electromagnetic device. In the figure, reference numeral 1 denotes an electromagnetic device, which is composed of a coil 2, a movable piece 3 that is activated by excitation of the coil 2, and a return spring 4 for the movable piece 3. The movable piece 3 is coupled to, for example, a spool of a solenoid valve (not shown). 5 is a switching transistor, the collector of which is connected to one end of the coil 2, and the emitter of which is grounded. 6 is a terminal connected to the base of the transistor 50 and to which the signal X is input; 7 is a terminal connected to the other end of the coil 2 and to which the power supply voltage E is applied;
8 is a diode connected in parallel to the coil 2.

The operation of this drive circuit is shown in Figure 2 (a), (b),
This will be explained with reference to the time chart shown in (C).

2(a) is a waveform diagram of the input signal X, FIG. 2(b) is a waveform diagram of the current 11 flowing through the coil 2, and FIG. 3(C) is a waveform diagram of the stroke Y of the movable piece 3. As shown in FIG. 2(a), at trap 1 time t, when the input signal X changes from a low level L to a high level H, the transistor 5 is turned on, and a current 1 begins to flow through the coil 2 due to the power supply voltage E1. The magnitude of current I is the value ■ at time t2. When reaching , the electromagnetic force generated in the coil 2 becomes larger than the force due to static friction between the spring 4 and the movable piece 2, and the movable piece 2 begins to move, reaching the maximum stroke Y at time t3. bawl. The current I decreases due to the back electromotive force generated by the movement of the movable piece 2, but
The current starts to increase again after time t3, and reaches the maximum current I at time t4.
It becomes max. Thereafter, the maximum current Ima flowing through the coil 2
Due to the electromagnetic force caused by x, the movable piece 3 is maintained at the maximum stroke Yo against the spring 4. Time t,
When the input signal X changes from the high level H to the low level L, the transistor 5 is cut off. However, due to the presence of the diode 8, the current ■, which continues to flow, will circulate through the diode 8, and the current ■, begins to decrease due to the resistance of the coil 2, and at time t, the current I, decreases until it can no longer hold the movable piece 3, and the movable piece 3 begins to return to its original position by the force of the spring 4, returning to its original position at time t. Current ■, is time -
Although it increases slightly due to the movement of the movable piece 3 between t2 and t2, it decreases to 0 after time t7. The presence of diode 8 makes it possible to prevent transistor 5 from being destroyed by the high potential that develops at the collector terminal when transistor 5 is turned off.

In the above operation, the current IrII that holds the movable piece 4
ax is voltage EI, resistance of coil 2 and transistor 5
It is a value determined by the resistance of (which can almost be ignored). In many cases, this current IITIIIx is continuously supplied to the coil 2, causing the coil 2 to generate heat and shorten its lifespan. Therefore, in order to avoid this, Imax is determined as the upper limit value for use of the current 11 (rated value), and the voltage E according to the current 1111111 of this rated value,
is normally applied to terminal 7.

In such an electromagnetic device I, it is desirable to shorten the time from when the signal X is input until the movable piece 3 reaches the maximum stroke Y0 as much as possible. In order to shorten this time, increasing the voltage E1 applied to the terminal 7 is an extremely effective means. FIG. 3(a) shows a time chart when voltage Et is increased in this way (voltage Et is set).

(b) t (C) K shown.

Now, at time t, when the input signal X becomes high level H, the transistor 5 becomes conductive and current begins to flow through the coil 2. In this case, the voltage E2 applied to the terminal 7 is higher than the voltage E as described above, so the rise of the current is as shown in Fig. 2 (b
) is steeper than the case shown in
At 2', the current becomes IO. At this time, the movable piece 2 starts moving at time 1.0, which is before time 1s. The maximum stroke YO is reached at /.

In the example shown in FIGS. 3(a) to (C), a voltage E1 is applied to terminal 7.
At time t when the movable piece 3 starts moving when the current (1) is applied (current (1) stroke Y is indicated by a broken line), the movable piece 3 has already reached its maximum stroke. After time t, the 1% flow ■ increases, and the voltage E,
exceeds the maximum current Imax that flows when the current Imax is applied, and finally reaches the maximum current Ima&. The movable piece 3 is held in this state.

In this way, the method using the high voltage E allows the movable piece 3 to operate at high speed, but it inevitably increases the maximum current Im,,' and has the disadvantage that the life of the coil 2 is shortened. I can't escape it. In order to overcome this drawback, a method called a two-power supply system using two power supplies with different voltages has been adopted.

This method will be explained using figures.

FIG. 4 is a circuit diagram of a drive circuit for an electromagnetic device using a conventional two-power supply system. In the figure, the coil 2 and terminal 6 are the same as those shown in FIG. lO is a holding transistor that supplies a holding current for holding the movable piece 3 to the coil 2; its collector is connected to a terminal 12 to which a low voltage E1 is applied; its emitter is connected to one end of a diode 14; Furthermore, the base is connected to a terminal 6 to which the signal X is input. ] 1 is a starting transistor that supplies current to the coil 2 only when starting up the electromagnetic device; its collector is connected to a terminal 13 to which a high voltage E is applied; and its emitter is connected to one end of a diode 15. ing.

The other ends of the diodes 1.4 and 1.5 are both connected to one end of the coil 2, and the other end of the coil 2 is grounded. 16
is a pulse generator whose input terminal is connected to the terminal 6 and whose output terminal is connected to the base of the starting transistor 110. This pulse generator 16 is composed of a monostable multivibrator, and when the input signal X changes from a low level L to a high level H, a predetermined time t elapses. During this period, a high level signal Z is output.

The operation of this drive circuit will be explained with reference to the time charts shown in FIGS. 5(a) to 5(C). At time t1, when the input signal X changes from low level L to high level H, the pulse generator 16 pulses for a predetermined time t as shown in FIG. 5(b). During this period, a high level signal Z is generated.

This signal Z turns on the starting transistor 11,
In coil 2, current I due to high voltage E2 flows through diode 1.
5. The rise of this current ■ is shown in Figure 5 (
As shown in C), the stroke is steep, and the movable piece 3 reaches its maximum stroke at time t3'. On the other hand, the holding transistor IO also becomes conductive due to the high level signal X, but no current is supplied to the coil 2 due to the voltage EI due to the intervention of the diodes 1.4 and 15.

After time t3/, the current generated by the voltage E'6 continues to increase, but at time (t, -+-to), the signal Z from the pulse generator I6 becomes low level, and the starting transistor 11 Ha is cut off. For this reason, the current 1. supplied to the coil 2. becomes a current due to the voltage E and decreases, and thereafter this decreased current Imax is supplied,
The movable piece 3 is held by this current.

In such a two-power supply system, when starting up the electromagnetic device, voltage is applied from a high-voltage power source to operate the movable piece at high speed, and when maintaining the operating state of the electromagnetic device, voltage from a low-voltage power source is applied. to lower the holding current,
The lifespan of the coil can be extended. however,
This method not only has the major drawback of requiring two power supplies with different voltages, but also requires two switching transistors and has a complicated circuit.

The present invention has been made in view of these circumstances, and its purpose is to eliminate the above-mentioned conventional drawbacks and to enable high-speed operation with a single power source.

Another object of the present invention is to provide a driving device for an electromagnetic device that can reduce the holding current.

In order to achieve this object, the present invention connects a terminal to which a power supply voltage is applied to one end of an excitation winding of an electromagnetic device and a switching means to the other end, and operates the switching means for a predetermined time by an input signal of the electromagnetic device. It is characterized in that the switching means is brought into conduction, and after a predetermined period of time has elapsed, the switching means is repeatedly turned on and off by a predetermined pulse output.

Embodiments of the present invention will be described below based on the embodiments shown in FIGS. 6, 8, and 10.

FIG. 6 is a circuit diagram of a driving circuit for an electromagnetic device according to a first embodiment of the present invention. In the figure, coil 2. Terminal 6 and pulse generator 16 are the same as shown in FIG. A switching transistor has a collector connected to one end of the coil 2 and an emitter grounded. 21
is a Zener diode connected between the collector and emitter of the transistor, and is used to speed up switching from the holding state to the off state of the electromagnetic device, and is not involved in starting the electromagnetic device. n is a terminal to which the other end of the coil 2 is connected, and a high voltage E is applied to this terminal 22.

is applied. T is an oscillator with a high level H (time T
It outputs a pulse train signal d which is alternately switched between a low level L (time T, ) and a low level L (time T, ). Sae is a NOT circuit that inputs the output signal a of the pulse generator 16 and inverts it, and 5 is a NOT circuit that inputs the inverted signal of each NOT circuit and the input signal X.
It is an ND circuit. It is a switch having three terminals A, B, and C. Terminal A is connected to an oscillator n, terminal B is connected to an input terminal 6K, and terminal C is connected to the base of a transistor. The switch 26 is composed of an analog switch, a field effect transistor (FBT), etc., and inputs an AND circuit O output signal C, and when this signal C is at a high level H, terminals A and C are in a conductive state. Therefore, signal C
When is at a low level L, terminals B and C are in a conductive state.

The operation of this embodiment will be explained with reference to the time charts shown in FIGS. 7(a) to (h). As shown in FIG. 7(a), when the signal X changes from low level L to high level H at time t1, the output signal a of the pulse generator 16 changes as shown in FIG.
As shown in b), the high level H is maintained for a predetermined time t0.

By inputting this signal a, the output signal of the NOT circuit changes to the time t as shown in FIG. 7(C).

The low level is L only during the period from t++to to time (t++to). Since the AND circuit 5 outputs the logical product of the output signal of the NOT circuit and the signal
+10) After that, it becomes high level H. Therefore, time t
, until the time (tt+to), the terminal B and the terminal C of the switch 26 are in a conductive state, and the switch 26 is in a conductive state from the time (t++to).
Thereafter, the terminal A and the terminal C of the switch A become electrically connected. On the other hand, the oscillator always outputs the pulse train signal d shown in FIG. 7(e). Therefore, the output signal e of the switch changes from time t to (t, -1-t
Until o), it becomes a high level H signal due to signal X,
After time (t, +to), it becomes a pulse train signal from the oscillator okara.

Signal e from time t to time (t, -1-to)
Due to the continuous high level H of E2, the transistor 20 becomes continuously conductive, and the current (2) due to the high voltage E2 is continuously supplied to the coil 2. As described in the conventional example of the rabbit, the current 11 rises rapidly until time (1, +16) as shown in FIG. ) until the maximum stroke is reached as shown. That is, the movable piece 3 operates rapidly. At time (tt+to), the conduction state of the switch 26 is changed and the terminals A and C are brought into conduction, so that a pulse train signal is applied to the base of the transistor as shown in FIG. Therefore, transistor 21)
is alternately turned on and off, and the current (2) supplied to the coil 2 also increases and decreases with a predetermined level width, as shown in FIG. 7(g). The magnitude of such current is the average current 11mean in the middle of the level width.
That is, the coil 2 has the time (t
After t+to), it can be said that the average current Imean is supplied, and this average current Ima@n has a current value considerably lower than the maximum current Imax' when the current Imean is continuously supplied. And the movable piece 3 is the time (
tx + to ) and thereafter, it is held by this current Imean.

After all, the holding current can be lowered by intermittent application of the transistor. The value of the average current Imeal is determined by the time T7 and the time TL of the pulse train signal d in the oscillator.
can be set to a desired value by appropriately adjusting the values, so by selecting this average current Imeaf+ to a value comparable to the rated value Imax explained in the conventional example, heat generation in the coil 20 can be prevented and the service life can be extended. It can be made longer.

Note that various types of oscillators can be used as the oscillator, such as one configured with an integrator and a comparator using an operational amplifier, or one configured with a clock pulse and a counter circuit.

In this way, in this embodiment, the conduction state of the switch is changed by the pulse generator, the NoT circuit, and the AND circuit.
A high-voltage current is supplied to the coil by keeping the transistor in continuous conduction for a predetermined period of time after the signal is input, and after the elapse of the predetermined period, the transistor is alternately turned on and off by a pulse train from an oscillator to adjust the average current supplied to the coil. Since it is designed to be low, the electromagnetic device can be operated at high speed with one power source, and the holding current can be made low.

FIG. 8 is a circuit diagram of a drive circuit for an electromagnetic device according to a second embodiment of the present invention. In the figure, the same parts as those shown in FIG. 6 are given the same reference numerals. The edict is an OR circuit which inputs the signal a of the pulse generator 16 and the signal d of the oscillator, 2
9 is an OR circuit A that receives the signal f and the input signal X as inputs.
It is an ND circuit.

The AND circuit power signal g is input to the base of the transistor via a resistor.

The operation of this embodiment will be explained with reference to the time charts shown in FIGS. 9(a) to 9(g). Note that the operation of this embodiment is almost the same as that of the rabbit embodiment. here,
As shown in FIG. 9(a), the signal X input to the terminal 6 changes from time t to time t2 and from time t to time t4.
Let us consider the operation when the level reaches high level H. The output signal a of the pulse generator [6] is generated at time 1.6 as shown in FIG. 9(b). for a predetermined time t. The level becomes high during this period. Therefore, OR, the output signal f of the circuit 28, and the AND circuit 2
The output signal g of 9 is also shown in FIG. 9(d).

As shown in (e), this predetermined time t. between high level H
becomes. Therefore, the transistor is applied for a predetermined time t.

The coil 2 continues to be in a conductive state for a long time, and a high voltage E2 is applied to the coil 2.
A current ■ is supplied as shown in FIG. 9(f),
The movable piece 3 moves rapidly to reach the maximum stroke Y as shown in FIG. 9(g). reach. Predetermined time t. Time t after elapsed
Until , the OR, circuit order and AND circuit 29
The output signal f + g + j of Fig. 9 ((i) l (e) K
Therefore, the signal becomes a signal in accordance with the output signal d of the oscillation multiplier, and the transistor repeatedly turns on and off.

Therefore, as described in the Sagi embodiment, the holding current of the movable piece 3 is the maximum current of 1ml1l due to continuous application of the voltage E.
The current I+T+ is not equal to X' but is lower than this,
, (=Imean).

At time t, the signal X becomes a high level H again, and a predetermined time t0 starts from this time, but the signal X returns to a low level L at a time t4 before the elapse of the predetermined time. Therefore, as shown in FIG. 9(e), the output signal g of the ANI) circuit 29 is at a high level only between times t and t4, and the transistor 20 is kept in continuous conduction during this period. is supplied with a steeply rising current due to the high voltage E2, and the movable piece 3 rapidly operates to reach the maximum stroke Y. The movable piece 3 is reliably held until time t4, when the transistor is turned off.

As described above, in this embodiment, the pulse generator, the zero circuit, and the A N ) circuit keep the transistor in continuous conduction for a predetermined period of time after the signal is input, and supply a high-voltage current to the coil, and after the predetermined period of time has elapsed, Since the transistors are alternately turned on and off by a pulse train from an oscillator to lower the average current supplied to the coil, the same effect as the Sagi embodiment can be achieved with a simpler configuration.

FIG. 10 is a block diagram of a driving device for an electromagnetic device according to a third embodiment of the present invention. In the figure, coil 2, terminals 6, 2
2.) The transistor ribs and Zener diode 21 are the same as those shown in FIGS. 6 and 7.

31 indicates a microcomputer, and an input interface 32. A CPU 33 that performs necessary calculations and control, this C
It is composed of R, 0M 34, which stores the processing procedure of the PU 33, RAM 35, which temporarily stores input data, calculation results, etc., and an output interface 36. The microcomputer 31 performs predetermined processing according to the signal X input to the terminal 6, and outputs the resulting signal to the base of the transistor.

The operation of this embodiment will be explained with reference to the flowchart shown in FIG. First, the signal X is taken in through the input interface 32, and the CPU 33 receives the signal
Determine whether K is present or at low level L (step S+
). When it is determined that the signal X is low,
7 lag 1 (FL) of the specified address of RAM 35
I) is set to 0. (Step s2) and the counter N
The contents of O are set to 0 (step SS). This counter N
o is the predetermined time t in each example of the rabbit. This is a counter that counts the time corresponding to . Since there is no need to activate the electromagnetic device when the signal X is at the low level L, there is no need to count the predetermined time, and therefore the content of the counter NO is set to O. Next, the output data DO is set to a low level L (Step 84), and the transistor 20 is cut off. Then, the high level counter NH
and the contents of the low-level counter NL are set to O, and step Sa), R, flag 2 of the designated address of AM35.
(FL2) is set to 0.

Here, the high level counter NH and the low level counter NL are counters that count the times corresponding to the high level H times T and I and the low level L time TL in the pulse train of the oscillator okara in each embodiment of Sagi. be. Further, the flag 1 mentioned above is an index indicating the state of the counter No. When the flag 1 is 00 (FL1=O), the counter N
It shows that the content of o has not reached a predetermined value, and when 7lag l is 1 (FL1=1), it shows that the content of counter No has reached a predetermined value. Furthermore, flag 2 is an index indicating the status of the high level counter NH and low level counter NL, and when flag 2 is O (FL2=O), it indicates that the content of the low level counter NL has not reached a predetermined value. When flag 2 is 1 (FL2=1), it indicates that the content of the low level counter NL has reached a predetermined value. After passing through step S6, the process returns to step S again.

When the signal X becomes a high level H, this is determined in step S1, and the process moves to step S7. In step S7, 11.
The contents of flag 1 of A M 35 are determined, and FL=0.
When the counter number is 0, it is determined whether the contents of the counter No. have reached the set value CTO (step S8). Setting value C
Predetermined time t in each example of TO rabbit. corresponds to If the contents of counter No. have not reached the set value CTO, add 1 to the contents of counter No. (step SO),
The output data Do is set to a high level I (and this signal is output to the transistor (step S). The transistor 20 becomes conductive, and current by the voltage E2 begins to be supplied to the coil 2. The contents of the counter No. are set. value C
Until TO is reached, that is, a predetermined time t in each embodiment of Sagi. Since the high level H is continuously output during this period, the high level counter NH and the low level counter NL
is set to O (step S5), and flag 2 is also set to 0 (
Step SO). Step S,, S7゜S8 t SO
# SIn? Each time the process of 811 es is repeated, 1 is added to the contents of the counter No., and the value finally reaches the set value CTO. When this is determined in step S, the contents of flag 1 are set to 11C1 (step S,
υ, the process goes through the same process and reaches step S7.

In this case, the predetermined time t in each embodiment of the transistor or the rabbit. The movable piece 3 has already reached its maximum stroke during this period of time.

If it is determined in step S7 that the content of 7lag 1 is 1 (the content of flag 1 has been rewritten to 1 in step 811), then the content of 7lag 2 is determined (step S, 2). If it is determined that the content of flag 2 is O, that is, it is determined that the time (set value CTL) corresponding to the time T of the low level L of the pulse train in each of the previous embodiments has not elapsed. If so, 1 is added to the low level counter NL (step S, 3). Then, in step S, the contents of this counter NL are compared with the set value CTL.
, 4) When the set value CTL has not been dropped, the output data DO is set to a low level L (step 15), and this signal is output to the transistor to turn it off. Each time such processing is repeated, the low level counter NLK1 is added,
In step 14, the contents of the low level counter NL are set to C.
When it is determined that TL has been reached, step S returns the contents of the low level counter NL to O in preparation for the next counting operation.
, 6), rewrite the contents of flag 2 to 1 (step S1
．． ), step S8. Step S1 e s,
? 812 processing is performed. In this case, transistor 2
It is in a cut-off state for a time corresponding to the time TLK of the low level L of the pulse train in each of the embodiments starting from 0, and during this time the current supplied to the coil 2 decreases.

When flag 2 is determined to be 1 in step Sat,
That is, if it is determined that the time (set value CT H) corresponding to the time T of the high level H of the pulse train in each of the previous embodiments has not elapsed, the high level counter N
1 is added to the content of H (step S1). and,
The contents of the high level counter NH and the set value CTH are compared (step 5I9), and when the contents of the high level counter NH is less than the set value CTH, the output data DO is set to a high level H.
(step 20), this signal is outputted to the transistor to make it conductive. Each time such processing is repeated, 1 is added to the high level counter NH, and step S. The content of the high level counter NH becomes the set value CTH.
If it is determined that the count has been reached, step S2. returns the contents of the high level counter NH to 0 in preparation for the next counting operation.
), the contents of flag 2 are replaced (lc9) (step S2
□), step S after step addition.

Return to In this case, the transistor is in a conductive state for a time corresponding to the high level H times T and I of the pulse train in each embodiment of the transistor.

When the output of the high level H is finished after the processing of steps SIo and Sy+e Stt+Bto, if the signal Therefore, the process moves to step 8st. Since flag 2 has been rewritten to 0 in step n, the process of outputting the low level L corresponding to the low level L in the No(rus sequence) in the example of the rabbit is performed again, and when that process is completed, flag 2 is changed to 0. Since it has been rewritten to 1 in step 81?, processing is now performed to output a high level H corresponding to the high level H in the pulse train in each of the previous embodiments. Thus, an output corresponding to the pulse train in each of the previous embodiments is obtained. When the signal X becomes low level T, K, step S,
, S, the contents of flag 1 are rewritten to 0, and the output returns to low level.

In this way, in this embodiment, a microcomputer is used to keep the transistor in a continuous conductive state and supply a high-voltage current to the coil for a time corresponding to the set value CTO after the signal input, and after this time has elapsed, the set value CTO is CTL, CT
By alternately outputting low-level and high-level signals for the time specified by H, the transistors are alternately turned on and off to lower the average current supplied to the coil. This has the same effect as the example.

In addition, in each of the above embodiments, examples have been explained in which the time period for which the transistor is kept in a continuous conduction state is set in advance, or the current passing through the coil is detected and the current reaches a predetermined current value. It is possible to use a comparator to determine whether or not the current value is present, and use this determination signal to input the pulse train to a microcomputer for processing. Alternatively, the detected current value can be input without using a comparator and compared within the microcomputer. You can also do that. Other appropriate switching elements can be used as the switching transistors in each embodiment.

As described above, in the present invention, the switching means connected to the excitation winding is made conductive for a predetermined period of time by an input signal of an electromagnetic device, and after the elapse of the predetermined period of time, the switching means is repeatedly activated by a predetermined pulse output. Since the electromagnetic device d is turned on and off, it is possible to operate the electromagnetic device d at high speed using one power source, and the holding current can be reduced.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a drive circuit for a conventional electromagnetic device, and Figure 2 (
a) j (b), (C) and Figure 3 (a) j
(b) and (C) are time charts explaining the operation of the circuit shown in FIG.
b), (C) are time charts explaining the operation of the circuit shown in FIG. 4, FIG. 6 is a circuit diagram of the drive circuit of the electromagnetic device according to the first embodiment of the present invention, and FIG. 7(a) ~(h)
is a time chart explaining the operation of the circuit shown in FIG. 6,
8 is a circuit diagram of a drive circuit for an electromagnetic device according to a second embodiment of the present invention, FIGS. 9(a) to 9(g) are time charts explaining the operation of the circuit shown in FIG. 8, and FIG. 11 is a block diagram of a driving device for an electromagnetic device according to a third embodiment of the present invention, and FIG. 11 is a flowchart explaining the operation of the driving device shown in FIG. 10. 1... Electromagnetic device, 2... Coil, 3.
...Movable piece, 16...Pulse generator, Addition...Switching transistor, Ru...
・Oscillator, Torture...NOT circuit, 5゜29...
...AND circuit, 26...switch, ah...
...O-circuit, 3]...Microcomputer, 32...Input interface, 33...
...CPU, 34...ROM. 35...R, AM, 36... Output interface. Agent Patent Attorney Takeshi Kenjibe (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 8 Figure 9 Figure 1O Figure E2 JP-A-Sho GO-49614 (10) Figure 1I

Claims (1)

[Claims] In an electromagnetic device including an excitation winding and a movable body actuated by the excitation of the excitation winding, a voltage application terminal connected to one end of the excitation winding and a voltage application terminal connected to the other end of the excitation winding for electrical continuity therebetween. and switching means for making the cutoff, means for making the switching means conductive for a predetermined period of time in response to input of an excitation signal to the electromagnetic device, and after the elapse of the predetermined time, the switching means is successively made conductive and cut off by a predetermined pulse output. 1. A driving device for an electromagnetic device, characterized in that a driving device for an electromagnetic device is provided.