JPS6056068B2 - pulse power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulse power supply device that effectively utilizes power energy to save power.

Normally, when manufacturing magnetic materials such as permanent magnets, materials such as iron are heat treated and then magnetized. To achieve this magnetization, the material is generally magnetized by placing it in a high magnetic field generated by supplying a large current to a coil for a certain period of time. A conventional power supply device that supplies a large current to a coil for generating a high magnetic field has a configuration as shown in FIG. 1 or 2. J, IJ--, ^, first circle of bar Load R due to B.

The power supply device is a DC continuous power supply system that continuously applies a large DC current of several thousand A to a coil array for generating a high magnetic field.On the other hand, in the device shown in Fig. After charging the capacitor C via the charging resistor, the charging switch 51 is turned off and the discharging switch 52 is turned on to pulse-discharge the charge in the capacitor C and apply a large current pulse to the load R. This is a shock magnetization power supply that applies several times. In addition, "I" shown in FIGS. 1 and 2 is the resistance of the coil L, and D in FIG. 2 is the resistance of the coil L.
is the load R. This is a diode for preventing reversal of the polarity of the current and for preventing reverse charging of the capacitor C. By the way, the device shown in FIG. 1 has a coil L for generating a high magnetic field.

By continuously supplying a large current to the material, it has the advantage of supplying a constant current to the required magnetization level of the material to be magnetized and maintaining a constant magnetizing force. However, since a large current is continuously supplied, the power consumption is large and the device becomes large. Furthermore, in the device shown in FIG. 2, it is necessary to apply a pulse current with a pulse width that can maintain a current at a level higher than the magnetization level of the material for a certain period of time, and therefore a large-capacity electrolytic capacitor is used as the capacitor C.
However, of the discharge energy of the capacitor C, the energy effective for magnetization is only the energy when the level of the pulse current exceeds the magnetization level of the material, and all other energy is invalidated, resulting in large power loss. In addition, a magnetic field generation coil! Since L/R is large, the discharge time becomes very long compared to the effective time for magnetization, and the magnetization of the material may be released, and the time interval of the pulse current becomes long. The magnetization time becomes long, and the production capacity of magnetic materials is significantly limited. The present invention takes into consideration the drawbacks of the conventional art, outputs a pulsed current by intermittently superimposing it on a small base DC current, and furthermore uses the energy accumulated in the load after passing the pulsed current to convert the energy accumulated in the load into the base DC current. It is designed to regenerate current into the input power source, and to effectively use electrical energy to save power.
Next, this invention will be explained in detail with reference to FIGS. 3 and 4 showing one embodiment thereof.

In Fig. 3, 1 is a commercial AC power supply, 2 is a diode rectifier connected to the AC power supply 1 via the on/off switch 3 of the AC power supply 1, and 4 and 5 are connected in series between both output terminals of the diode rectifier 2. The current limiting resistor and the energy storage capacitor 6 are voltage detectors inserted between the connection point between the current limiting resistor 4 and the energy storage capacitor 5 and the control terminal of the open/close switch 3, and are used to charge the energy storage capacitor 5. The voltage is detected and the on/off switch 3 is opened/closed.

7 is a discharge switching element such as a thyristor whose input terminal such as an anode is connected to the connection point between the resistor 4 and the capacitor 5, and 8 is a pulse controller connected to the control terminal such as the gate of the discharge switching element 7. The switching element 7 is made conductive at regular intervals, and the energy storage capacitor 5, the discharging switching element 7, and the pulse controller 8 constitute a pulse discharge circuit PC.

9 is an inductive load whose both ends are connected to the output terminal such as the cathode of the switching element 7 and the negative output terminal of the diode rectifier 2, and the coil L.

inductance and coil! The resistance R. It consists of 1
0 is a thyristor rectifier that rectifies the three-phase AC input power source 11 and outputs a small DC current to the inductive load 9, and is configured with a wiring system that can be controlled by an inverter.

Next, the operation of the embodiment will be explained with reference to FIG. 4.

Now, when the switching element 7 is in a non-conducting state, the inductive load 9 is supplied with a predetermined direct current ■Dc from the thyristor rectifier 10 as shown in FIG. Coil L.

This generates a DC magnetic field that serves as the base for the magnetization device. Further, at this time, a constant DC voltage indicated by Edc in FIG. On the other hand, the capacitor 5 is charged to a potential Ec through the on-off switch 3, the diode rectifier 2, and the current-limiting resistor 4, as shown in FIG.
Then, at [T1], when a pulse is output from the pulse controller 8 and the switching element 7 becomes conductive, the charge in the capacitor 5 is discharged via the switching element 7 and the inductive load 9, as shown in Figure b. and inductive load 9
The voltage applied to the capacitor 5 increases to the charging voltage Ec of the capacitor 5, as shown in FIG. Then, until the voltage applied to the load 9 by the capacitor 5 reaches the output voltage Edc of the thyristor rectifier 10 [T2], the discharge current of the capacitor 5, that is, the pulse current flowing through the switching element 7 is as shown in FIG. The capacitance of the capacitor 5 is C'' and the inductance of the coil of the load 9 is L''.
At [T2], the current increases to Ip=ECxIC''/L'', and the current flowing through the load 9 also increases from IdC to [h] as shown in Figure d. Note that at this time, the thyristor rectifier 10 is reverse biased by the voltage of the capacitor 5, and the current does not flow, so that the load 9
is supplied with only the discharge current of the capacitor 5. Then, after time [T2], the voltage of the capacitor C becomes lower than the output voltage Edc of the thyristor rectifier 10, so the switching element 7 is reverse biased, but the inductive load 9 is delayed and becomes a power factor load. Therefore, as shown in figure c, the delayed current continues to flow, and at [T3] the delayed current reaches 0.
When this happens, the switching element 7 becomes non-conductive.

The pulse width Tp of the pulse current flowing through the switching element 7 may be considered to be Tp=7rVL″C″. On the other hand, coil L of load 9. Since the gate voltage is constantly applied to the thyristor of the thyristor rectifier 10 from the AC input power supply 11, the discharge energy accumulated in
From time to time, the energy is regenerated to the input power supply 11 side via the thyristor rectifier 10, and this regenerated energy is gradually regenerated based on the load 9, the thyristor rectifier 10, and other time constants. Therefore, as shown in figure d, the load 9
The current flowing through the current gradually decreases from [T2],
Eventually, the voltage becomes Idc, and the voltage of the load 9 also gradually rises from time [T3], as shown in Figure A, and eventually reaches Edc. Furthermore, when the switching element 7 becomes non-conductive, the voltage detector 6 detects the potential of the capacitor 5 and operates, making the open/close switch 3 conductive, and connects the AC power source 1 to the open/close switch 3, the diode rectifier 2, and the current limiting resistor. A current flows into the capacitor 5 through the capacitor 4, and as shown in FIG. Thereafter, the same operation as described above is repeated, and a constant small DC current of 1 dc is continuously supplied to the load 9, and current pulses are intermittently supplied superimposed on the DC current. Therefore,
When the power supply device is used as a magnetizing device, the material is magnetized by the magnetic field generated in the load 9 by the pulse current, and the magnetization effect is maintained by the base magnetic field generated by the small DC current, and the material is The energy is the resistance R of the coil of the load 8 in the discharge loop of the capacitor C5, the switching element 7, and the load 9. Since the other discharge energy is regenerated to the input power supply 11 side of the thyristor rectifier 10, the magnetization process can be performed efficiently. As described above, according to the pulse power supply device of the present invention, a rectifier that rectifies an AC input power source and outputs a small DC current is installed between both ends of an inductive load such as a coil having an inductance that generates a magnetic field with a DC current. At the same time, a pulse discharge circuit consisting of an energy storage capacitor and a discharge switching element connected in series is connected in parallel to the inductive load, and when the capacitor is discharged, the pulse current of the pulse discharge circuit is added to the DC current of the rectifier. By superimposing the energy and supplying it to the inductive load, and regenerating the discharge energy supplied to the inductive load through the rectifier to the input power supply side after the capacitor is discharged, power loss is reduced to the energy discharged from the capacitor. The energy consumed by the circuit resistance of the discharge loop can be reduced, and furthermore, only a small DC current is required to be continuously supplied to the load, so a great power saving effect can be obtained.

Furthermore, since the discharge energy is regenerated to the input power source side of the rectifier, the abnormal voltage that occurs when the capacitor discharges in conventional devices does not occur. In particular, if the present invention is applied to a magnetizing device for manufacturing magnetic materials, the material can be magnetized reliably and efficiently with less energy, and a remarkable effect can be obtained.

[Brief explanation of drawings]

1 and 2 are wiring diagrams of a conventional power supply device used in a magnetizing device, FIG. 3 is a wiring diagram of an embodiment of the pulse power supply device of the present invention, and FIG. 4 is a diagram showing each part of FIG. 3. The operating current and operating voltage are shown in Figure A is a waveform diagram of the load voltage, Figure B is a waveform diagram of the voltage across the capacitor, Figure C is a waveform diagram of the discharge current of the capacitor, and Figure D is the waveform diagram of the load voltage. It is a waveform diagram of a current. 5... Energy storage capacitor, 7...
...Discharge switching element, PC...Pulse discharge circuit, 9...Inductive load, 10...
- Rectifier, 11... AC input power supply.

Claims (1)

[Claims] 1. A rectifier that rectifies an AC input power source and outputs a small DC current is connected between both ends of an inductive load such as a coil having an inductance that generates a magnetic field with a DC current, and a rectifier that outputs a small DC current is connected to the inductive load. A pulse discharge circuit formed by connecting a capacitor and a discharge switching element in series is connected in parallel, and when the capacitor is discharged, the pulse current of the pulse discharge circuit is superimposed on the DC current of the rectifier and supplied to the inductive load. and, after discharging the capacitor, the discharge energy supplied to the inductive load is regenerated to the input power source side via the rectifier.