JPS6037758Y2 - magnetic bubble drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble drive device, and more particularly to a coil excitation device for creating a rotating magnetic field for magnetic bubble drive.

An example of a coil drive circuit system that combines two or more drive coils to generate a rotating magnetic field for driving a magnetic bubble is the drive circuit shown in FIG.

In this figure, 1 to 4 are NPN transistors, 5 to 8 are diodes, C1 is an X drive coil, C2 is a Y drive coil,
9.10 are positive and negative power supply terminals.

Diodes 5 to 8 are connected in parallel to transistors 1 to 4 with opposite polarity, and coils C□ and C are connected through these parallel circuits.
One ends of the coils 2 are connected to power supply terminals 9 and 10, respectively, and the other ends of these coils are connected to a neutral point.

Fig. 2 is a time chart of the operation explanatory diagram in Fig. 1, showing an example of the voltage and current waveforms of each part of the circuit when starting and stopping the rotating magnetic field over one cycle, and a to d are transistors 1 and 1, respectively. ~4 base voltage waveforms, e and f are current waveforms flowing through the X coil C□ and Y coil C2, respectively, and g
, h indicate the current waveforms flowing through the power supply terminals 9 and 10, respectively.

To briefly explain the current flowing in the drive coil, for example, the current 11 flowing in the X drive coil C□, as shown in FIG.
When the voltage waveform shown in is applied, the transistor 1 is turned on, and the voltage +■ of the terminal 9 is applied to the coil C1, and a current waveform that increases exponentially from time t1 is obtained, and the drive coil C1 has the voltage waveform e shown in the figure. A current having the waveform shown from time t to time t is supplied from the power supply connected to the terminal 9.

Next, if we turn off transistor 1 at the time, coil C
Due to the electromagnetic energy stored in the coil C□, a voltage is generated in the current sustaining direction, and this voltage causes the terminals 10 and
A current flows through the diode 6 and the coil C□, and this current decreases exponentially while returning power to the power supply connected to the terminal 10.

When the voltage waveform shown in the figure is applied to the base of the transistor 2 at time 1, the transistor 2 is turned on, and the voltage -Vl of the terminal 10 is applied to the X drive coil C1. A current that increases exponentially in the opposite direction is supplied to the driving coin L/C1 from the power source at the terminal 10.

This) and t.

If =t2-t1=j3-j2=shima-t3... is made sufficiently small compared to the time constant of the coil, the current in each period can be considered to change approximately linearly.

t. As the current waveform approaches the time constant τ from O, the current waveform becomes curved.

Similarly, if you turn on and off transistors 1.2,
A substantially triangular current ■□ as shown in the figure e flows through the X drive coil C1.

For the Y drive coil C2, by turning on and off the transistors 3 and 4, a triangular wave current I2 (FIG. 2f) can be obtained in exactly the same way as for the X coil C1.

Driving coil C1 drives triangular wave currents with different phases.
, C2, a rotating magnetic field is generated and the magnetic bubble can be effectively driven.

By the way, in this circuit, during each 1 h cycle, the power source is either supplying or collecting power, and exceptionally, that is, the power source 1
At 0, supply and collection are performed, and at power supply 9, neither supply nor collection is performed.

This type of power supply uses a capacitor for smoothing and has a large current value, so if power is only supplied or recovered for 174 cycles, the power supply voltage will fluctuate greatly.

Of course, if this is to be suppressed, it will be necessary to take measures such as increasing the capacitance of the capacitor.

The present invention eliminates such unbalance of power supplies during 174 cycles, and each power supply supplies only the power consumed by the drive coil and drive circuit, thus creating a drive device equipped with a drive circuit system that can reduce the capacity. This is what we provide.

The present invention provides two sets of magnetic bubble drive devices that share positive and negative power supplies and four control signals whose phases differ by 174 periods.
, Y partial drive coils, and four switching elements that are respectively provided between the other ends of these X and Y drive coils and the positive and negative power supplies and are opened and closed in response to the above control signals, and these switching elements are connected in parallel to each other. four unidirectional elements provided and having opposite polarity to the power supply;
The switching elements in one set of drive devices and the switching elements in the other set of drive devices, which are simultaneously opened and closed by a common control signal, are connected to power supplies of opposite polarity.

Next, the present invention will be explained in detail with reference to the drawings.

Figure 3 is a diagram showing the configuration of the magnetic valve drive device of the present invention, in which power is supplied to the drive coil as a load from one power source, reactive power accumulated in the coil is recovered by the other power source, and the reactive power accumulated in the coil is recovered by the other power source. Two drive circuits shown in FIG. 1, which perform opposite operations, are combined to balance each power source.

In this figure, 1 and 2 are the drive circuits shown in FIG. 1, 3 and 4 are timing inputs for operating the X drive circuit, and 5 and 6 are timing inputs for operating the Y drive circuit.
Set the on/off timing of the transistors inside.

? , 8, 11, and 12 are X drive circuit timing input terminals, and the connections to timing inputs 3 and 4 are reversed between circuit 1 and circuit 2.

9, 10, 13, and 14 are Y drive circuit timing input terminals, which are similarly connected to the timing input terminals 5 and 6 in reverse order.

Reference numerals 15 and 17 are X drive circuit output terminals, to which X drive coils C1, c, and ' are connected, respectively.

Further, 16 and 18 are Y drive circuit output terminals, which are connected to Y drive coils C2 and C2', respectively.

19.21 is a power input terminal connected to the positive power terminal 23, and 20.22 is a power input terminal connected to the negative power terminal 24.

FIG. 5 shows the drive device shown in FIG. 3 in more detail, and this figure shows the transistors Q1 to Q1 in each set of drive circuits to which timing inputs 3, 4, 5, and 6 are applied, respectively.
Q,, Q,'~Q4' are clearly shown.

That is, a pair of transistors Ql? which are opened and closed simultaneously by a common timing input 3? Q1' is the positive power supply 2
Pairs of transistors Q29 Q2' and Q, , Q3' and Q are connected to the negative power supply 24 and the other timing inputs 4,5°6 at the same time.

Similarly, Q and / are also connected to mutually opposite polarity power supplies 23 and 24.
It is connected to the.

Therefore, as will be explained in detail later, current is simultaneously supplied from the positive and negative power sources in each 174 period, and furthermore, the current supplied from the reverse polarity power source to another coil 114 periods earlier is now the positive and negative power sources. Recovered to negative power supply.

For example, 174 cycles ago, the positive power supply 2 is
Assume that power is supplied from the negative power source 24 to the drive coil C2' through the transistor Q41, and power is supplied to the drive coil C2 from the negative power supply 24 through the transistor Q4.

Then, in the next 18 cycles, current is recovered from the drive coil 02' through the diode D3' to the negative power source 24, and current is recovered from the drive coil C2 through the diode D3 to the positive power source.

And, apart from these recovery currents, timing manual power 3
The transistor Q is connected from the positive power supply 23 to the drive coil C1 by
1, and current is supplied from the negative power supply 24 to the drive coil C1' through the transistor Q1'.

Thus, current supply and recovery are balanced for both positive and negative power supplies.

The same applies to other 1-h periods, but they will be described in detail below based on the operation waveforms.

Figure 4 shows the current waveforms of each part of the drive circuit in Figure 3, where a is the current waveform flowing through the X drive coil C1, b is the current waveform flowing through the Y drive coil C2, and C is the current waveform flowing through the X drive coil C1'. , d is the current waveform flowing through the Y drive coil C2', e is the current waveform at the power input terminal 19, f is the current waveform at the power input terminal 20, g is the current waveform at the power input terminal 21, h
indicates the current waveform of the power supply input terminal 22, i indicates the current waveform of the power supply terminal 23, and j indicates the current waveform of the power supply terminal 24.

Next, the operation of this circuit will be explained.

The current flowing through the X drive coils C1 and c1' is a,
Adjust the timing manually to obtain the current waveform shown in c.
input signals from the drive circuits 1 and 2 to the timing input terminals 7, 8 and 11.12 of the drive circuits 1, 2.

At this time, the polarity of the current flowing through the X drive coil 01' is opposite to that of the current flowing through the X drive coil C1 (FIG. 4a), as shown in FIG. 4C, but the polarity of the current flowing through the X drive coil C If the terminals are connected in reverse, the directions of the rotating magnetic fields will be the same.

Similarly, in order to make the current flowing through the Y drive coils C2 and C2' have a current waveform as shown in Figure 4d, the input signals from the timing manpower 5 and 6 are adjusted to the Y drive circuit timing of the drive circuit 1.2. It is applied to input terminals 9, 10 and 13, 14.

As a result, the power input terminals 19, 20 of the drive circuits 1, 2,
The current waveforms 21 and 22 are as shown in FIG. 4 et ft gt h.

The current waveform of the power supply terminal 23 is a composite of the current waveform of the power supply input terminal 19.21 (Fig. 4 evg), and the current waveform of the power supply terminal 24 is a composite of the current waveform of the power supply input terminal 20.22 (Fig. 4 f,
h), and thus the current waveforms are as shown in FIG. 4, 19j, respectively.

As is clear from the current waveform diagrams of the power supply terminals 23 and 24 shown in FIG. .

(Supply and recovery are performed every 174 cycles, excluding the beginning and end.) Therefore, only the power consumed by the drive coil and drive circuit is supplied from each power supply, and the balance between each power supply is , and the power supply voltage ripple can be reduced.

As explained in detail above, the magnetic bubble drive device of the present invention can supply power and recover reactive power the same number of times by combining two drive circuits, thereby maintaining the balance of each power source. , it becomes possible to reduce the capacity of the power supply and reduce ripple.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional magnetic bubble drive circuit, Figure 2 is a current waveform diagram to explain its operation, Figure 3 is a diagram to explain the drive circuit system of the present invention, and Figure 4 is a diagram to explain its operation. FIG. 5 is a detailed diagram of the drive device shown in FIG. 3. In the drawing, 01, 01', C2, 02' are drive coils, 1,
2 is a drive circuit, 3, 4, 5.6 is a timing input, 23
．． 24 are positive and negative power supply terminals.

Claims (1)

[Claims for Utility Model Registration] In two sets of magnetic bubble drive devices sharing positive and negative mold sources and four control signals whose phases differ by 174 cycles, each drive device has one end connected to a neutral point. TaX. Four switching elements are provided between each of the Y partial drive coils, the other ends of these X and Y drive coils, and the positive and negative power supplies and are sequentially opened and closed by the above control signals, and four switching elements are provided in parallel with each of these switching elements. The switching element in one set of drive devices and the switching element in the other set of drive devices, which are simultaneously opened and closed by a common control signal, have mutually opposite polarity with respect to the power supply. A magnetic bubble drive device characterized in that it is connected to a polar power source.