JPH0723035Y2 - Pulse current generator power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pulse current generating power supply device for supplying a pulse current to a reactor load such as a superconducting coil.

[Conventional technology]

Conventionally, in this type of pulse current generating power supply device, as shown in FIG. 4, by detecting the voltage V _T generated between the collector and the emitter of the transistor section 1 which is a fine adjustment function section for finely adjusting the output, The output voltage of the rectifier unit 3, which is a coarse adjustment function unit that performs the coarse adjustment of the output through the controller 2 so as to keep it constant, is adjusted by the feedback, and the load on the transistor unit 1 is increased as much as possible with respect to the fluctuation of the load 4. Control not to. Further, the output current is detected by a current detector 5 such as a shunt, and the transistor unit 1 is controlled so as to have a constant current through the amplifier 6. The above device is expected to provide a highly accurate and economical output in a wide output range by combining the advantages of the thyristor rectifier with the response speed, efficiency and economy and the accuracy of the transistor and the quick response. It is used in some cases. Incidentally, 7 is a main power source including a three-phase AC power source 8 and a rectifier unit 3, and 9 is a filter.

However, in the case of the reactor load, the ON signal is sent from the amplifier 6 to the transistor unit 1 during the rising period when the detected current of the current detector 5 is smaller than the set value, and the transistor unit 1 is completely turned on. Since most of the voltage of the main power source 7 is applied to the load 4 and the pulse current i rises at a rising speed di / dt = e / L determined by the reactance L of the load 4 and the voltage e applied to the load, Pulse current i
The steeper the rising edge of, the higher the voltage of the main power supply 7 needs to be, but if the pulse current i enters the control region and reaches a constant value I _o , theoretically the load voltage Therefore, most of the voltage of the main power supply 7 must be borne by the transistor section 1 and the resistor 10. Here, if the resistance value of the resistor 10 is increased, the load on the transistor section 1 is lightened, but the rise of the pulse current i becomes slow, and the desired current waveform cannot be obtained. The rectifier 3 for coarse adjustment must control a wide range, and there are many ripples during steady operation.
Both the filter 9 and the voltage capacity must be increased.
Since the feedback system is not stable unless it is slowed down very much, the absorbed energy of the transistor section 1 and the resistor 10 must absorb most of the output power from the main power supply and release heat during that time. Loss capacity cannot be ignored. In addition, it is uneconomical to manufacture a product having such a capacity because of its large outer shape, which is expensive and the system is not stable.

[Problems to be solved by the invention]

When the reactor load is used as described above, the transistor unit 1 is used during the rising period of the pulse current i and during the steady operation.
There is a significant change in the voltage across both ends of the power supply, and the voltage of the main power supply 7 must be increased in order to speed up the rise, which results in a loss during steady operation. On the contrary, if the voltage of the main power supply 7 is reduced, the rise of the pulse current i is delayed, and the desired current pulse waveform cannot be obtained.
When the current pulse is terminated, the polarity of the load voltage is inverted through the commutation circuit 13 including the resistor 11 and the diode 12 to release energy. At this time, the sum of the inversion voltage of the load 4 and the voltage of the main power supply 7 Since the voltage applied to the transistor unit 1 is high, the voltage of the main power supply 7 is high, the corresponding
There is a problem that the withstand voltage is required.

[Means for solving problems]

In order to eliminate the above drawbacks, the present invention supplies a pulse current from a main power source composed of a three-phase AC power supply and a rectifier section to a reactor load via a transistor section, and detects the pulse current to detect the transistor section. In a pulse current generating power supply device to be controlled, the collector-emitter voltage of the transistor section is detected, and when the detected value is below a certain fixed value and the transistor section is in an ON state, the transistor is turned on, and the detected value is set to a certain constant value. When the rectifier unit of the auxiliary power supply is turned on when the rectifier unit is turned off when the value is equal to or more than the value, the sum of the main power supply and the auxiliary power supply is applied to the load when the rectifier unit of the auxiliary power supply is in the ON state. A pulse current generating power supply device characterized by being connected to a main power supply so that only the voltage of the main power supply is applied to a load when the rectifier unit is in an off state. .

[Action]

Since the present invention is configured as described above, when the detected value of the collector-emitter voltage of the transistor section is a certain value or less and the pulse current rises when the transistor section is turned on, the voltage of the main power supply is increased. In addition to driving the pulse current generating power supply device at a relatively high voltage of the sum of the voltage of the auxiliary power supply and the voltage of the auxiliary power supply, the rise of the pulse current is made steep, and the voltage of the main power supply is in the steady state where the detected value is a certain value or more. Only drive the pulse current generating power supply device with a relatively low voltage to prevent loss to a minimum.

〔Example〕

FIG. 1 is a view showing an embodiment of the present invention. In the figure, 7'is an auxiliary power source comprising a three-phase AC power source 8'and a rectifier section 3 ', and 14 is a diode. In the steady state, power is supplied from the main power source 7 to the load 4 via the diode 14. The rectifier section 3'of the auxiliary power supply 7 'constantly detects the voltage across the transistor section 1, and the detected value is below a certain fixed value and the transistor section 1 is in the ON state (the load current i is smaller than the set value). At this time, the gate signal works to turn on the auxiliary power supply 7 ', and the sum voltage of the main power supply 7 and the auxiliary power supply 7'is applied to the load 4. When the voltage across the transistor unit 1 becomes a controlled state and becomes a certain value or more,
The gate signal of the rectifier unit 3'is set to be turned off, and the auxiliary power supply 7'is disconnected from the main power supply 7. This operation will be specifically described. FIG. 2 is a diagram for enlarging and explaining the auxiliary power supply 7 '. Where R, S, T connected in Y
It is assumed that the thyristor is supplying power between the P and N nodes through the node of, and when the gate pulse is in the on state, the voltage between P and N is a three-phase half-wave voltage as shown in Fig. 3 (a). It is responsible for the output. It can be seen that the phase inversion causes the thyristor of the phase indicated by the dotted line to be in the off state, the P side on phase to be the N side off, and vice versa. In that state, when the gate-off signal is received, the power that had been flowing through the thyristor will continue to flow as it is. As shown in FIG. 3 (b), when the gate is turned off at the moment when the R phase is phase-inverted, the S side N side thyristor, which has been on until now, continues to be in the operating state. Occurs on the load side as it is. Even when the voltage of the T-phase becomes smaller than that of the S-phase, the T-phase thyristor does not have a gate signal, and thus phase inversion is not performed. This state is 120 degrees delayed RS
It continues until the phase is reversed, at which point the main current
The thyristor, which was operating in the R-S phase, is reverse biased and automatically turns off. This delay time is 60
It becomes the electrical angle of ° ~ 120 °. At the time of steady operation,
Since the auxiliary power supply 7 ′ is disconnected from the main power supply 7 when the transistor unit 1 operates, only the main power supply 7 is operated. When a pulse waveform is generated in the pulse power supply circuit for a reactor load, the auxiliary power supply is turned on and off digitally by detecting the on / off state of the voltage across the transistor section as in the present invention. As for the device, it is very easy and there is no need to make various adjustments.
Reliable operation is performed. Further, the rising speed of the waveform can be adjusted freely, and there is no influence at all during steady operation. Further, in the present invention, since the main power source is a three-phase full wave and low voltage, the capacity of the filter can be reduced and the problem of transient phenomenon due to LC at startup can be eliminated.

[Effect of device]

As described above, according to the present invention, a pulse current for supplying a pulse current from a main power source including a three-phase AC power supply and a rectifier unit to a reactor load via a transistor unit and detecting the pulse current to control the transistor unit. In the current generating power supply device, the collector-emitter voltage of the transistor section is detected, and when the detected value is below a certain fixed value and the transistor section is in the ON state, it is turned on, and the detected value is above a certain fixed value. When the auxiliary power supply consisting of a rectifier unit and a three-phase AC power supply that are turned off when the auxiliary power supply rectifier unit is in the ON state, the sum voltage of the main power supply and the auxiliary power supply is applied to the load, and the auxiliary power supply rectifier unit The pulse current generating power supply device is characterized in that it is connected to the main power supply so that only the voltage of the main power supply is applied to the load in the off state. Since the present invention has such features, it is possible to minimize the loss of the pulse current generating power supply device, and
The system can be stabilized and the rise of the pulse current can be controlled arbitrarily. Since the auxiliary power source only needs to be used in the transient state, it may have a small capacity.

[Brief description of drawings]

1 to 3 are views for explaining an embodiment of the present invention, and FIG. 4 is a view for explaining a conventional pulse current generating power supply device. 1 ... Transistor section, 2 ... Controller 3, 3 '... Rectifier section, 4 ... Load 5 ... Current detector, 6 ... Amplifier 7 ... Main power supply, 7' ... Auxiliary power supply 8, 8 '... Three-phase AC power supply, 9 ... Filters 10,11… resistors, 12,14… diodes 13… commutation circuits

Claims (1)

[Scope of utility model registration request] 1. A pulse current generating power supply device for supplying a pulse current from a main power supply composed of a three-phase AC power supply and a rectifier section to a reactor load through a transistor section and detecting the pulse current to control the transistor section. In, when the collector-emitter voltage of the transistor section is detected and the detected value is below a certain constant value and the transistor section is in the ON state, it is turned on, and when the detected value is above a certain value, it is turned off. When an auxiliary power supply composed of a rectifier unit and a three-phase AC power supply is used, when the rectifier unit of the auxiliary power supply is in the ON state, the sum voltage of the main power supply and the auxiliary power supply is applied to the load, and the rectifier unit of the auxiliary power supply is in the OFF state. A pulse current generating power supply device characterized by being connected to a main power supply so that only the voltage of the main power supply is applied to a load.