JP2005184917A - Pulse power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a power supply pulse rate and to reduce the power receiving capacity of a charger for charging a capacitor. <P>SOLUTION: A pulse power supply device supplies a power in a pulse-like state to a load. The pulse power supply device includes a plurality of capacitors for storing charge. The pulse power supply device charges the other capacitor except the capacitor while the certain capacitor is discharged to supply a power to the load, while the pulse power supply device charges the certain capacitor while the other capacitor is discharged to supply the power to the load. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pulse power supply device.

The pulse power supply device is a power supply device that can respond to an instantaneous and relatively large power demand required by a load, and is used as, for example, a power supply for an arc welding machine or a power compensation device that compensates for an instantaneous power interruption. Such a pulse power supply device generally supplies electric charge charged in a capacitor (power storage device) to a load as electric power, and supplies instantaneous electric power to the load by discharging the charged capacitor. Such a power supply device is disclosed in, for example, the following known documents.
Japanese Patent Application Laid-Open No. 06-077855 Japanese Patent Laid-Open No. 06-238443 JP 2003-274664 A

  By the way, the above-mentioned pulse power supply device supplies the charge charged in the capacitor as electric power to the load, so that although large electric power can be instantaneously supplied to the load, when the power supply interval to the load is short, that is, when the power supply pulse rate is large Cannot supply sufficient power to the load because sufficient time cannot be recharged. In addition, when the power supply pulse rate is increased, the time for recharging the capacitor is shortened, so that a charger having a large power receiving capacity is required.

This invention is made | formed in view of the situation mentioned above, and aims at the following points.
(1) Improve the power supply pulse rate.
(2) The power receiving capacity of the charger for charging the power storage device is reduced.

  In order to achieve the above object, according to the present invention, a pulse power supply device that supplies power in a pulsed manner to a load includes a plurality of power storage devices that accumulate charges, and discharges a certain power storage device to supply power to the load. Resolving means for charging other power storage devices excluding the power storage device being supplied while charging the power storage device while discharging the other power storage device and supplying power to the load Is adopted.

  According to the present invention, power storage and power supply to a load are alternately performed by alternately charging and discharging a certain power storage device and another power storage device among a plurality of power storage devices. The charging time can be increased, so that the power supply pulse rate can be improved and the power receiving capacity of the charger can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of the pulse power supply device according to the present embodiment. In this figure, symbols C1 and C2 are capacitors (power storage devices), SW1 to SW3 are switches, CH is a charger, T is a chopper circuit, and L is a load. This pulse power supply device includes capacitors C1 and C2, switches SW1 to SW3, and a charger CH, and supplies power to a load L via a chopper circuit T. The chopper circuit T includes switching transistors Tr1 and Tr2 and diodes D1 and D2.

  One end of the capacitor C1 is connected to one contact of the switch SW1 and one selection contact a of the switch SW3. One end of the capacitor C2 is connected to one contact of the switch SW2 and the other selection contact b of the switch SW3. The other end of the capacitor C1 and the other end of the capacitor C2 are connected to the emitter terminal of the switching transistor Tr2 and the anode terminal of the diode D1.

  The other contact of the switch SW1 and the other contact of the switch SW2 are connected to the collector terminal of the switching transistor Tr1 and the cathode terminal of the diode D2. The common contact of the switch SW3 is connected to the output terminal of the charger CH. The charger CH charges the capacitors C1 and C2 via the switch SW3.

  The chopper circuit T composed of the switching transistors Tr1 and Tr2 and the diodes D1 and D2 is, for example, a well-known voltage type two-quadrant chopper circuit as shown in the figure, and supplies power supplied to the load L from the pulse power supply device. It is for controlling the supply. In the chopper circuit T, the contact between the emitter terminal of the switching transistor Tr1 and the cathode terminal of the diode D1 is connected to one end of the load L, while the contact between the collector terminal of the switching transistor Tr2 and the anode terminal of the diode D2 is connected to the load L. Is connected to the other end. The load L is an electromagnet for an accelerator, for example.

  Here, in FIG. 1, a control circuit for controlling the switches SW1 to SW3 and the switching transistors Tr1 and Tr2 is omitted. As will be described below, this control circuit controls the switches SW1 to SW3 to intermittently supply power from the pulse power supply device to the chopper circuit T, and also controls the switching transistors Tr1 and Tr2 by PWM control, for example. The pulse power supplied from the circuit T to the load L is adjusted.

  Next, the operation of the present pulse power supply device will be described with reference to the circuit diagram shown in FIG. 2 and the waveform diagram shown in FIG. In the following description, the operation of the chopper circuit T interposed between the present pulse power supply device and the load L is a known power control operation, and thus the description thereof is omitted.

  First, in FIG. 1 described above, the common contact of the switch SW3 is connected to one selection contact a, the switch SW1 is set in the open state, and the switch SW2 is set in the closed state. In this state (state A), the output end of the charger CH is connected to one end of the capacitor C1 via the switch SW3, so that the capacitor C1 is charged by the charger CH, while the capacitor C2 charged first. Is connected to the chopper circuit T via the switch SW2, so that the electric charge of the capacitor C2 is supplied to the chopper circuit T as electric power.

  On the other hand, FIG. 2 shows a state (state B) opposite to the state A. That is, in this state B, the common contact of the switch SW3 is connected to the other selection contact b, the switch SW1 is set to the closed state, and the switch SW2 is set to the open state. In this state, since the output end of the charger CH is connected to one end of the capacitor C2 via the switch SW3, the capacitor C2 is charged by the charger CH, while one end of the previously charged capacitor C1 is the switch. Since it is connected to the chopper circuit T via SW1, the electric charge of the capacitor C1 is supplied to the chopper circuit T as electric power.

  FIG. 3 is a waveform diagram showing each part current and voltage in the state A and the state B as described above. The upper stage shows changes corresponding to the switching operation of the switches SW1 to SW3 of the power supply current Ips supplied from the pulse power supply device to the chopper circuit T, and the middle stage shows the switches SW1 to SW3 of the terminal voltage Vc1 at one end of the capacitor C1. The change corresponding to the switching operation is shown, and the lower part shows the change of the terminal voltage Vc2 corresponding to the switching operation of the switches SW1 to SW3 at one end of the capacitor C2. In FIG. 3, a period T1 is a period required for switching between the state A and the state B, that is, a time required for switching the switches SW1 to SW3, and a period T2 is a charging period (= discharge period).

  That is, in FIG. 3, the pulsed power supply current Ips corresponding to the first and third is based on the discharge of the capacitor C1, that is, supplied to the chopper circuit T when this pulse power supply device is set to the state B. Current. In this case, since the capacitor C1 discharges electric charge, the terminal voltage Vc1 gradually decreases, while the capacitor C2 is charged by the charger CH, so that the terminal voltage Vc2 gradually increases.

  On the other hand, the pulsed power supply current Ips corresponding to the second and fourth is based on the discharge of the capacitor C2, that is, supplied to the chopper circuit T when the pulse power supply device is set to the state A. Current. In this case, since the capacitor C2 discharges the electric charge, the terminal voltage Vc2 gradually decreases, while the capacitor C1 is charged by the charger CH, so that the terminal voltage Vc1 gradually increases.

  As described above, in this embodiment, by switching the switches SW1 to SW3, the two capacitors C1 and C2 are alternately charged and discharged, so that the pulsed power supply current Ips is sequentially supplied to the chopper circuit T. In order to supply the chopper circuit T with the same power supply pulse rate and a current value equivalent to the power supply current Ips using a single capacitor, it is necessary to charge a single capacitor in a shorter time. A charger with a larger power receiving capacity is required.

  However, according to the present embodiment, one capacitor (C1 or C2) is discharged and the other capacitor (C2 or C1) is charged while the power source current Ips is supplied to the chopper circuit T. The charging time can be set longer than when a capacitor is used, and thus the power receiving capacity of the charger can be reduced.

  In other words, in response to a request to increase the power supply pulse rate, when a single capacitor is used, the charging time is shortened, so the power receiving capacity of the charger needs to be increased. Since the charging time can be set longer than when using the battery charger, the request can be met without increasing the power receiving capacity of the charger.

In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the case where two capacitors C1 and C2 are used has been described. However, the present invention is not limited to this, and a configuration using three or more capacitors may be employed.
(2) Although the above embodiment supplies power to an acceleration tube electromagnet as the load L, the load L is not limited to such an electromagnet.
(3) In the above embodiment, the case where a voltage-type two-quadrant chopper circuit is used as the chopper circuit T has been described. However, the present invention is not limited to this, and other types of chopper circuits may be used.
(4) In the above embodiment, the capacitors C1 and C2 are used as power storage devices, but the present invention is not limited to this. The power storage device is a device that stores energy through electricity, and is a pulse forming network or a pulse forming line composed of a flywheel, an electric double layer capacitor, a battery, etc., or a capacitor, an inductance, and a resistor in addition to a capacitor. May be.
(5) In the above embodiment, the chopper circuit T composed of the switching transistors Tr1 and Tr2 and the diodes D1 and D2 is used. As the details of the switching transistors Tr1 and Tr2, a general transistor, IGBT, MOSFET, or the like is considered. It is done. Further, a gap switch or a mechanical contact may be used in place of the switching transistors Tr1 and Tr2.

It is a 1st circuit diagram which shows the function structure of the pulse power supply device concerning one Embodiment of this invention. It is a 2nd circuit diagram which shows the function structure of the pulse power supply device concerning one Embodiment of this invention. It is a wave form diagram which shows operation | movement of the pulse power supply device concerning one Embodiment of this invention.

Explanation of symbols

C1, C2 ... capacitors, SW1-SW3 ... switch, CH ... charger, T ... chopper circuit, L ... load

Claims (3)

A pulse power supply device that supplies power in a pulsed manner to a load,
It has a plurality of power storage devices that store electric charge, and while discharging the power storage device and supplying power to the load, it charges other power storage devices except the power storage device, while discharging the other power storage device. And charging a certain power storage device while supplying power to the load.   2. The pulse power supply device according to claim 1, wherein the number of power storage devices is two. The pulse power supply device according to claim 1 or 2, wherein the load is an electromagnet.

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