JP5754570B2 - Pulse power supply - Google Patents

Description

  The present invention relates to a pulse power source including a main power source and an auxiliary charging power source.

Patent Document 1 discloses a device 20 including a battery 25, a capacitor C1, a power supply / charging switching circuit 200 that connects both of them, and a control device 21 including a one-chip computer (FIG. 3). reference).
Based on the threshold value set for the terminal voltage of the capacitor C1 and the threshold value set for the ambient temperature, the control device 21 does not perform charging when the terminal voltage is higher than the first threshold value. When it is between the threshold values, the power supply / charging switching circuit 200 is controlled so that charging is performed only when the ambient temperature exceeds the threshold value, and charging is performed regardless of the ambient temperature when the ambient temperature falls below the second threshold value.

JP 2008-79464 A

Patent Document 1 proposes a charging method from a battery (main power source) to a capacitor, and the device 20 includes only a main power source as a charging power source.
Here, the inventors of the present application pay attention to the fact that it is difficult to control the charging voltage with high accuracy in the configuration having only the main power source as the power source for charging as in Patent Document 1, and the high accuracy of the charging voltage. In order to enable easy control, a pulse power supply was devised that not only includes a main power supply and a capacitor but also an auxiliary charging power supply. However, such a pulse power supply has the following problems.

In a pulse power supply that further includes an auxiliary charging power supply as well as the main power supply and the capacitor, it is conceivable to monitor the voltage of the capacitor with a voltage divider and perform dropper control.
However, in this case, conduction noise from the load side directly enters the auxiliary charging power source. In addition, the accuracy of the capacitor charging voltage depends on the accuracy of the voltage divider and dropper control.

  An object of the present invention is to provide a pulse power source that can reduce noise entering the power source for auxiliary charging and can stabilize the accuracy of the charging voltage of the capacitor.

  In order to achieve the above object, according to the present invention, in a pulse power source that charges a capacitor at a predetermined charging voltage by a main power source and an auxiliary charging power source provided separately from the main power source, the auxiliary charging power source A switching element connected to switch the voltage output from the auxiliary charging power supply, a parallel circuit connected in parallel between a reactor and a resistor, interposed between the switching element and the capacitor, and the auxiliary charging. There is provided a pulse power supply comprising: a control unit that performs local control so that a constant voltage is output from a power supply for power supply and performs on / off control of the switching element.

According to the above configuration, in a configuration including the main power source and the auxiliary charging power source, the control unit performs local control so that a constant voltage is output from the auxiliary charging power source, and on / off control of the switching element. I do. Thereby, the conduction noise from the load side is prevented from directly entering the auxiliary charging power source, and the noise entering the auxiliary charging power source can be reduced.
In addition, according to the above configuration, since the parallel circuit in which the reactor and the resistor are connected in parallel is interposed between the switching element and the capacitor, the conduction noise from the load side is before reaching the auxiliary charging power source. Furthermore, it is attenuated by the filter effect of the reactor and resistance. Therefore, noise entering the auxiliary charging power source can be further reduced.
Furthermore, the above configuration eliminates the need for dropper control on the capacitor side, and eliminates the problem that the accuracy of the capacitor charging voltage depends on the accuracy of the voltage divider and dropper control. Therefore, the accuracy of the capacitor charging voltage can be stabilized.

  According to the present invention, in a configuration including a main power source and an auxiliary charging power source, the control unit performs local control so that a constant voltage is output from the auxiliary charging power source, and performs on / off control of the switching element. By doing so, noise entering the auxiliary charging power source can be reduced and the accuracy of the charging voltage of the capacitor can be stabilized.

It is a circuit diagram of the pulse power supply concerning one embodiment of the present invention. It is a circuit diagram of the pulse power supply which concerns on the comparative example of this invention. It is a circuit diagram of the pulse power supply concerning a prior art.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  First, with reference to FIG. 1, a circuit configuration of a pulse power supply 1 according to an embodiment of the present invention, functions of each unit, and the like will be described.

  The pulse power source 1 includes a main power source 10, a capacitor 11, an auxiliary charging power source 12, a switching element 13, a reactor 14, a resistor 15, and a control unit 20.

  The main power supply 10 and the auxiliary charging power supply 12 are both power supplies that generate a pulse current, and are connected to the load 16 via the capacitor 11. The load 16 is a discharge tube, for example, and also serves as a noise source.

  The capacitor 11 is connected to both the main power supply 10 that performs rough control and the auxiliary charging power supply 12 that performs fine control. Capacitor 11 accumulates charges from main power supply 10 and also accumulates charges from auxiliary charging power supply 12 when switching element 13 is on. The accumulated electric charge is supplied to the load 16.

  The switching element 13 is provided between the auxiliary charging power source 12 and the capacitor 11. The switching element 13 may be an IGBT, FET, GTO, thyristor, or any other switching element.

  A reactor 14 and a resistor 15 are provided between the switching element 13 and the capacitor 11 in a state of being connected in parallel with each other. When the switching element 13 is on, the auxiliary charging power source 12 is connected to the parallel circuit of the reactor 14 and the resistor 15. When the switching element 13 is off, the parallel circuit of the auxiliary charging power source 12, the reactor 14 and the resistor 15 is connected. Disconnect from the.

  The control unit 20 is connected to both the auxiliary charging power source 12 and the switching element 13. The control unit 20 performs local control so that a constant voltage is output from the auxiliary charging power source 12 (that is, directly controls the auxiliary charging power source 12 by sending a control signal to the auxiliary charging power source 12). ) And on / off control of the switching element 13 is performed.

Here, when only the resistor 15 is provided between the switching element 13 and the capacitor 11, a potential difference may be generated between the voltage of the auxiliary charging power supply 12 and the voltage of the capacitor 11.
In the present embodiment, the occurrence of the potential difference is suppressed by providing the resistor 15 connected in parallel to the resistor 15 between the switching element 13 and the capacitor 11. Further, the presence of the resistor 15 prevents resonance between the reactor 14 and the capacitor 11.

As described above, according to the pulse power source 1 of the present embodiment, the control unit 20 outputs a constant voltage from the auxiliary charging power source 12 in the configuration including the main power source 10 and the auxiliary charging power source 12. In addition to performing local control, on / off control of the switching element 13 is performed. Thereby, the conduction noise from the load 16 side is prevented from directly entering the auxiliary charging power source 12, and the noise entering the auxiliary charging power source 12 can be reduced.
Moreover, according to this embodiment, since the parallel circuit which connected the reactor 14 and the resistance 15 in parallel is interposed between the switching element 13 and the capacitor | condenser 11, the conduction noise from the load 16 side is auxiliary charge. Before reaching the power source 12, it is attenuated by the filter effect of the reactor 14 and the resistor 15. Therefore, noise entering the auxiliary charging power source 12 can be further reduced.
Furthermore, in the case of the configuration of the present embodiment, the dropper control on the capacitor 11 side becomes unnecessary, and the problem that the accuracy of the charging voltage of the capacitor 11 depends on the accuracy of the voltage divider and the dropper control is solved. Therefore, the accuracy of the charging voltage of the capacitor 11 can be stabilized.

  Next, with reference to FIG. 2, a circuit configuration of a pulse power supply 100 according to a comparative example of the present invention, functions of each unit, and the like are described.

  The pulse power supply 100 includes a main power supply 10, a capacitor 11, an auxiliary charging power supply 12, a switching element 13, and a control unit 20. That is, the pulse power supply 100 according to this comparative example corresponds to the pulse power supply 1 of the above-described embodiment except for the parallel circuit of the reactor 14 and the resistor 15. Here, the same constituent elements as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  According to the pulse power supply 100 of this comparative example, the control unit 20 can perform local control so that a constant voltage is output from the auxiliary charging power supply 12 and can perform on / off control of the switching element 13. The filter effect by the parallel circuit of the reactor 14 and the resistor 15 cannot be obtained. Therefore, in this comparative example, the same effect as the above-described embodiment (an effect of reducing noise entering the auxiliary charging power source 12 and stabilizing the accuracy of the charging voltage of the capacitor 11) can be sufficiently obtained. I can't.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims.

  The present invention is applicable to any pulse power source that generates a pulse current in addition to a pulse power source for supplying power to an accelerator that handles an electron beam or a proton beam.

1 Pulse Power Supply 10 Main Power Supply 11 Capacitor 12 Auxiliary Charging Power Supply 13 Switching Element 14 Reactor 15 Resistance 16 Load 20 Control Unit

Claims (1)

In a pulse power source that charges a capacitor at a predetermined charging voltage by a main power source and an auxiliary charging power source provided separately from the main power source,
A switching element connected to the auxiliary charging power source and switching a voltage output from the auxiliary charging power source;
A parallel circuit interposed between the switching element and the capacitor, in which a reactor and a resistor are connected in parallel;
A control unit that performs local control so that a constant voltage is output from the auxiliary charging power source, and performs on / off control of the switching element;
A pulse power source characterized by comprising:

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