JPH11103581A - Power source apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a simply power source apparatus having fast response and high stability, by controlling an output sharing voltage of a power source having a fast response using a power source having a low speed response. SOLUTION: A power source 1 having a fast response and a power source having a low speed response are connected in series. Current of an electromagnet 4 is controlled by a controller 3. The power source apparatus is obtained by the entirety except the electromagnet 4. The power source 1 having the fast response becomes a two-quadrant converter. The power source 2 having the low speed response has a thyristor converter 21 and a transformer 22 for the converter. The controller 3 has a constant-current controller 31 for controlling load current, constant-voltage controller 32 for rapidly responding to control a voltage of the power source 1, a PWM controller 34 for generating a control pulse of the power source 1 according to it, a constant-voltage controller 33 for controlling a voltage of the power source 2, and an automatic pulse phase shifter 35 for controlling the control pulse to the power source 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power supply device,
More particularly, the present invention relates to a high-stability power supply capable of high-speed response suitable for application to an accelerator.

[0002]

2. Description of the Related Art In recent years, a number of particle accelerators have been constructed for medical and synchrotron radiation applications. In the accelerator, the trajectory of elementary particles is controlled by the magnetic field generated by the electromagnet. To keep the trajectory stable, the excitation power supply has a current fluctuation of 0.0001.
The following high stability and low ripple performance are required. Furthermore, a synchrotron accelerator must be a power supply capable of high-speed response in order for the current to follow the pattern.

[0003] Such a power supply includes Hitachi Review Vol. 79, N
o. A power supply using an active filter as shown on pages 78-79 is used.

However, since a power supply using an active filter operates via a reactor transformer by the active filter, it is affected by the transient characteristics of the filter and the frequency characteristics of the reactor transformer, so that the output response has a required frequency characteristic. There was a problem that it was difficult.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple power supply device which can respond at high speed, has high stability, and has high stability.

[0006]

SUMMARY OF THE INVENTION The present invention combines a low-speed response power supply and a high-speed response power supply in series, and provides a high-speed response constant-voltage control device using a high-speed response power supply. And a constant voltage control device using a power supply. The constant voltage control device that responds at high speed outputs the output voltage of the power supply at high speed. In addition, a constant voltage control device using a power supply that responds at a low speed controls so as to reduce the output sharing voltage of the power supply that can respond at a high speed.
The output amount such as the current of the power supply is controlled by setting the voltage set value of the constant voltage control device that responds at high speed.

In the present invention, a power supply having a low-speed response and a power supply capable of a high-speed response are combined in series, and a control device which responds at a high speed using a power supply capable of a high-speed response outputs the output voltage of the power supply at a high speed. I have to. Since the output amount such as the current of the power supply is controlled by setting the voltage set value of the control device that responds at high speed, the output amount can be controlled at high speed. In addition, since constant voltage control is performed, the output voltage can be stably held even when there is disturbance such as a voltage fluctuation of the AC power supply, and high-stability control without fluctuation or ripple of the output amount can be performed. In addition, a constant voltage controller using a power supply that responds at a low speed controls the output sharing voltage of the power supply that can respond at high speed, so that the power supply that can respond at high speed bears only transient sudden changes. And the whole power supply device can be easily realized at low cost.

[0008]

FIG. 1 shows an embodiment of the present invention. This is the case where the output current is only in one direction. A power supply 1 capable of high-speed response and a power supply 2 capable of low-speed response are connected in series, and a control device 3 controls the current of an electromagnet 4 as a load. The entire power supply device other than the electromagnet 4 is a power supply device.

The power supply 1 capable of high-speed response is a two-quadrant converter. That is, the IGBTs are composed of IGBTs (insulated gate bipolar transistors) 121 and 122, diodes 131 and 132 connected in anti-parallel to them, an IGBT converter 11 composed of diodes 141 and 142 of the opposite arm, a DC capacitor 15, and a DC power supply 16. I have. The reactor 17 and the capacitor 18 are high-frequency filters for suppressing high-frequency components generated from the IGBT converter, but may be omitted in some cases.

Since the IGBT switches at a high frequency of, for example, 10 kHz, the output voltage can respond at a high speed of 1 ms or less. If necessary, the switching frequency can be further increased, multiplexed, or M
10 μm using a faster device such as OSFET
It is also possible to make the response less than s.

The configuration of the DC power supply 16 only needs to be able to maintain a constant DC voltage, and may normally be a forward converter using a diode. However, when the converter 11 outputs a negative voltage, energy is regenerated from the load, and it is necessary to consider the processing.

The power supply 2 which responds slowly has a thyristor converter 21
And a transformer 22 for the converter. Although one converter is used and a three-phase bridge generates six pulses, a plurality of converters may be used to generate 12 or 24 pulses. A DC filter including a reactor 23 and a capacitor 24 is provided to reduce voltage ripple generated from the converter.

The control device 3 generates a control pulse of a constant current control device 31 for controlling a load current, a constant voltage control device 32 for controlling a voltage of a power supply capable of a high-speed response, and a control pulse of a power supply capable of a high-speed response accordingly. PWM control device 3
4. Constant voltage control device 3 for controlling the voltage of the power supply having a low speed response
3, an automatic pulse phase shifter 35 for controlling a control pulse of a power supply having a low-speed response.

In the control device 3, the adder 361 obtains the difference between the current set value Ir and the load current Id detected by the current detector 6, and the constant current control device 31 operates accordingly.
The power supply voltage setting value Vr is output.

The constant voltage control device 32 which responds at high speed determines the difference between Vr by the adder 362 and the output voltage Vf of the entire power supply detected by the voltage detector 51, operates according to the difference, and operates according to the response. The control amount Mf is output. The PWM control device generates a control pulse for operating the IGBT converter 11 according to Mf. As a result, the power supply capable of high-speed response operates and the control is performed at high speed so that Vf, that is, the output voltage of the entire power supply becomes equal to Vr.

On the other hand, in the constant voltage control device 33, the adder 3
At 62, the difference between Vr and the output voltage Vs of the thyristor converter 21 detected by the voltage detector 52 is determined, the operation is performed according to the difference, and the control amount Ms of the low-speed response power supply is output. The automatic pulse phase shifter 35 switches the thyristor converter 21 according to Ms.
Generates a control pulse. As a result, the thyristor converter operates and the output voltage Vs is controlled to be equal to Vr. If Vs becomes equal to Vr, reactor 2
If the voltage drop at 3 is ignored, the output voltage of the power supply capable of high-speed response becomes 0.

As a result, in the constant current control device, the output voltage set value can be quickly applied to the electromagnet 4 by a power supply capable of high-speed response, so that the coil current follows the set value at high speed. It becomes possible. Subsequently, the power supply responding at a low speed responds and bears the output voltage. Therefore, the power supply capable of responding at a high speed only needs to bear the transient sudden change, and may have a small capacity. Since the output voltage of the entire power supply is controlled at a high speed by constant voltage control, even if there is disturbance due to voltage fluctuation of the AC power supply, the output hardly fluctuates, and a highly stable power supply can be realized.

The constant voltage controller 33 controls the output voltage of the thyristor converter 21. This is to enable a response as fast as possible without any delay in the filter. As shown in another embodiment, the output voltage of a power supply having a low-speed response may be controlled.

Another embodiment of the present invention is shown in FIG. In this embodiment, the output voltage Vfc of the power supply 1 capable of high-speed response is detected by the voltage detector 53, and the low-speed response power supply 2 is controlled so that the voltage becomes zero. The operation is the same as in the embodiment of FIG.

Another embodiment of the present invention is shown in FIG. This embodiment is an example in which the direction of the current can be made in both positive and negative directions. In the power supply 1 capable of high-speed response, all the four arms of the IGBT converter 112 are formed of IGBTs, and the power supply 1 is a conversion device capable of operating in four quadrants. The low-speed response power supply 2 connects two thyristor converters 211 and 212 in anti-parallel, and is a converter capable of operating in four quadrants. The operation is the same as in the embodiment of FIG. However, another control device (not shown) for controlling the current circulating between the thyristor converters 211 and 212 is required.

This embodiment is also effective when it is necessary to control the current to near zero. Since a power supply capable of high-speed response can operate stably even with a small current, it may be possible to use only a power supply with low-speed response as in this embodiment in some cases.

FIG. 4 shows still another embodiment of the present invention. In this embodiment, the power supply of the low-speed response is a GT using the GTO.
It comprises an O converter 213. In order to control the GTO converter, the controller uses PW instead of the automatic pulse phase shifter.
An M controller 342 is used. In this case, the DC power supply 29 is also generally configured using a GTO converter. By doing so, the operating power factor of the low-speed response power supply having a large capacity can be set to 1. In the present embodiment, the power supply of the low-speed response also supplies power via the DC capacitor, so that even if the voltage of the AC power supply fluctuates, the voltage fluctuation of the DC capacitor becomes small, and the influence of disturbance is reduced. can do.

Further, if DC power is also supplied from an energy storage device (not shown), the capacity of the power supplied from the AC system does not greatly fluctuate even when the power is operated according to the pulse pattern. Can also. For this reason, the voltage fluctuation of the AC power supply accompanying the pulse pattern operation can be reduced, and more accurate control can be performed.

In the above embodiment, the current setting value Ir
Is assumed to have a change rate di / dt of, for example, as shown in FIG. Assuming that the inductance of the electromagnet 4 is L and the resistance is R, the required output voltage of the power supply is L · di
/ Dt + R · Ir, the result is as shown in FIG.
By doing so, the rate of change of the output voltage of the power supply changes continuously. Therefore, the voltage can be easily followed even by a power supply having a low-speed response, and the capacity of the power supply capable of a high-speed response can be extremely reduced.

Since the power supply device according to the present invention can respond at high speed and has high stability, it can stably accelerate particles according to a high-speed pattern when applied to a power supply for an accelerator.

[0026]

According to the present invention, since the output is controlled by a power supply capable of high-speed response, high-speed response is possible. Since the output voltage is controlled at high speed by using the constant voltage control device, it is possible to respond at high speed even when the voltage of the AC power supply fluctuates, and to realize a highly stable power supply with extremely small fluctuation in output. Since the control is performed so as to reduce the output burden of the power supply capable of responding at high speed with the power supply responding at low speed, the capacity of the power supply capable of responding at high speed is small, and it can be realized with a simple configuration at low cost.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention.

FIG. 2 shows another embodiment of the present invention.

FIG. 3 shows another embodiment of the present invention.

FIG. 4 shows another embodiment of the present invention.

FIG. 5 is an example of a change rate of a current setting value Ir.

[Description of Signs] 1 ... Power supply capable of high-speed response, 2 ... Power supply of low-speed response, 3 ... Control device, 4 ... Electromagnet, 6 ... Current detector, 11, 112 ...
IGBT converter, 15, 28 ... DC capacitor, 16,
29: DC power supply, 17, 23, 231, 232: Reactor, 18, 24: Capacitor, 21, 211, 212
... Thyristor converter, 22,221,222 ... Transformer transformer, 31 ... Constant current controller, 32 ... Constant voltage controller which responds at high speed, 33 ... Constant voltage controller, 34,342
... PWM controller, 35 ... automatic pulse phase shifter, 51,5
2, 53 ... voltage detector, 121, 122 ... IGBT, 1
31, 132, 141, 142, 261, 262, 27
1,272 ... diode, 213 ... GTO converter, 25
1,252... GTO, 361, 362, 363.

Claims (5)

[Claims] 1. A power supply comprising a series combination of a power supply capable of a high-speed response and a power supply of a low-speed response. A control device is provided to control the output of the entire power supply by changing the set value of the constant voltage control device that responds at high speed, and to reduce the voltage share of the power supply that can respond at high speed with the power supply having low response. A power supply device characterized by being controlled. 2. The power supply device according to claim 1, wherein a voltage type converter is used as both a power supply capable of high-speed response and a power supply of low-speed response. 3. The power supply device according to claim 1, wherein at least part or all of the power of the power supply responding at a low speed is supplied from an energy storage device. 4. The power supply device according to claim 1, wherein a set value of an output amount of the power supply device is smoothed so that a change rate of an output voltage is continuous. 5. An accelerator device using the power supply device according to claim 1.