JPH02226703A - Electromagnet coil power supply apparatus - Google Patents

Abstract

PURPOSE:To enable coil current to follow a current set value very precisely by calculating and setting an electromagnet coil voltage with reference to a current error in the previous cycle by self-learning tuning. CONSTITUTION:Output from a current error detector 9 is accumulated and stored every cycle in a memory 15a of a voltage reference calculating means 15. Output from a current reference setting device 8 and output from an accumulating and storing means 15b are added together by a current reference adder 15c and a current reference calculator 15d calculates an estimated value of an electromagnet voltage and sets a voltage reference value Vref that is corrected every cycle. Thus, output of the current error detector 9 is converged to an approximately fixed value by the self-learning tuning system correcting the reference value Vref repeatedly. Thereby, it is possible to obtain electromagnet coil current following a current set value with high precision, without increasing a total numer of switching operations of an electric powder converter 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is an SOR (Synchrotron 0rbit) that accelerates electrons or separators to high energy.
This invention relates to an electromagnetic coil power supply device for radio waves.

[Conventional technology]

FIG. 3 is shown in, for example, Hitachi Hyoron, Vol. 60. No
, 10 (197B-10), in which 1 is an AC power source and 2 is a power converter for converting AC into DC or DC into AC. 3 is a filter consisting of a DC reactor 3a, its resistance 3b, and a capacitor 3c;
4 is an electromagnetic coil represented by a resistance 4a and an inductance 4b.

Reference numeral 5 denotes a DC current sensor serving as an electromagnetic coil current detection means for detecting the current flowing through the electromagnetic coil 4, and is, for example, a DC current transformer.

This DC current sensor 5 is connected in series with the electromagnetic coil 4. Reference numeral 6 denotes a DC voltage sensor serving as an electromagnetic coil voltage detection means for detecting the voltage of the electromagnetic coil 4, and is, for example, a voltage divider. Reference numeral 7 denotes an AC voltage sensor serving as an AC voltage detection means for detecting the magnitude of the voltage of the AC power source 1, and is, for example, a voltage transformer. 8 is a current reference setter for controlling the power converter 2 and determining the magnitude of the electromagnet coil current i; 9 is a current error detector; 10 is a current controller; 11 is a voltage reference setter;
12 is a voltage error detector, 13 is a voltage controller, 14
is a firing phase circuit for determining the control angle of the power converter 2 in synchronization with the cycle of the voltage of the AC power supply l output from the AC voltage sensor 7, and this firing phase circuit 14 and the current reference setting device 8, current error detector 9, current controller 10
, a voltage reference setter 11, a voltage error detector 12, and a voltage controller 13 constitute a control circuit 20.

Next, the operation shown in FIG. 3 will be explained below with reference to the time chart shown in FIG. First, in the steady state, time t is the completion of the previous cycle of electromagnet coil current i, ie the beginning of the next new cycle, and this new cycle completes l cycles at time t. Then the next new cycle begins.

For example, the electromagnet coil current i required in SOR,
As shown in FIG. 4(a), the output l1. It is a triangular wave (or trapezoidal wave) with a period T similar to , and it rises from time L+, reaches I ax at time t, and the electromagnet coil current i, which was I□Y at time t, is at time t. , and falls to O.

Therefore, the voltage V to be applied to both ends p-n of the electromagnetic coil 4 is (1, -1
t period), V, -L@(d i@/d t)+R,1,-・-・・
(1) However, the inductance 4b of the Lai electromagnet coil 4, the resistance 4a and n of the Rmi electromagnet coil 4 are of positive polarity with 1 quasi-potential, and the power converter 2
The control angle α of the thyristor is operated at 90° or less.

Also, when the electromagnet coil voltage V, falls (tx-1,
The voltage required for the period) is v−−L−(d i −/d t ) + Ra i
a ”・”・(2) Therefore, the control angle α of the thyristor is operated so as to be delayed by 90″ or more.

4) shows the waveform of the electromagnet coil voltage V, and FIG. 4(C) shows the waveform of the current error ε5.

In this way, the power converter 2 clocks in accordance with the output (=set value) command value of the current reference setting device 8, and thereafter periodically controls the control angle α of the thyristor to supply a triangular wave to the electromagnetic coil 4. .

Note that the DC reactor 3a and capacitor 3C of the filter 3 smooth the DC voltage ripples (ripples that are integral multiples of the power supply frequency) generated by controlling the power converter 2, and allow a current with less helix pull to flow in the electromagnetic coil 4. That's what I do.

By the way, the power supply for the electromagnetic coil 4 of the SOR described above is required to perform current control that follows the reference setting value ir*t of the electromagnet coil current ta with high precision.

For example, the value of the electromagnet coil current i,' required at the rise or fall of the triangular wave current is in the range of several to 100% of its maximum value, and the tracking accuracy ε of the triangular wave current setting reference value I Pat is required. Electromagnet coil current at that time 1. The specific tracking accuracy is, for example, the current setting reference value i1. of the current reference setting device 8. ．． This is done on the order of ±104.

However, the tracking accuracy ε is defined as follows.

ε-(12,t-ta)/l,,t...
(3) For this purpose, it is necessary to speed up the control response of the power converter 2. Therefore, the number of constituent phases of power converter 2 is 12.
phase, or 24 phases, etc., to increase the total number of si-risk switching in one cycle of the power supply frequency.

However, in this case, there are restrictions in terms of economy or implementation technology, and - about 24 phases are often used for boat fishing.

The control system of the power converter 2 is composed of the DC voltage sensor 6 → voltage error detector 12 → voltage controller 13 → ignition phase circuit 14 → power converter 2 → filter 3, as shown in FIG. This voltage minor loop is comprised of a voltage minor loop, and a current major loop that is constructed from the voltage minor loop→electromagnetic coil 4→DC current sensor 5→current error detector 9→current controller 10.

Therefore, since the conventional electromagnetic coil power supply device has a voltage minor loop as a control system, which has a response speed approximately one order of magnitude faster than the current major loop, the current reference setter 8
The voltage reference value v1. ．． is calculated by the voltage reference setter 11, and then sent to the voltage controller 1 via the voltage error detector 12.
3 is given a control deviation ε9 so that the electromagnet coil current i follows the current reference value 1 raf with high accuracy.

Next, the operations of the current controller 10 and voltage controller 13 in the control circuit 20 shown in FIG. 3 will be explained below.

First, if the transfer function of the electromagnetic coil power supply device shown in FIG. 3 is expressed graphically, it can be represented by the block diagram shown in FIG. In addition, in FIG. 5, the voltage minor loop is indicated by a broken line, and if this portion is rewritten, it can be represented simply as shown in FIG. 6, and the current major loop can be represented as shown in FIG. 7.

However, G vmc j! (s) is the voltage minor loop transfer function.

The calculations shown in FIGS. 6 and 7 above are performed using the following parameters, respectively. That is, (a) In the case of Fig. 6, the controlled object i (14, 2 and 3) - Cg(s)・Gp
(s)・Gf(s) feedback gain; (6)→K
v (s) Controller (compensation circuit): (13)
→G vc (s) Controlled amount iVa Target direct; V, . , ten Δvr* control deviation; ε.

(b) In the case of Fig. 7, the controlled object; (Gvmcj!(s) and 4) → Gv
mc1 (s) ・Gs (s) Feedback gain; (5) → K c (s) controller (compensation circuit); (10) → Gcc (s) control amount;
i Target value i1r*r Control deviation; ε.

This is a feedback control consisting of:

In this feedback control, the controller (compensation circuit) is designed to feed back the value of the controlled variable and compare it with the target value, and to reduce the control deviation of the difference as quickly (as small as possible).In other words, the controller It is a kind of compensation circuit that compensates for defects in the characteristics of the circuit, and is constructed by using proportional, integral, differential, etc. elements singly or in appropriate combinations.

Therefore, the output of the current controller 10 ΔV raf-Gcc(s)・ε direct ・・・・・
... (4) Output θ of voltage controller 13,, t-Gcv(s)・g, ..."" (5
).

For example, if the controller is a proportional element, Gcc (
s) = KccSGcv(s) = Kcν.

However, Kcc and KCV are constants. Next, the voltage reference setter 11 outputs the voltage reference value vvat as shown in the following equations (6) and (7).

(^) When the current starts up (period of 1.-1. in Figure 4) V
r*e-Lm(d i raf/dL) +Ra・l
rat +... (6) (B) When the current falls (
Fig. 4g-t, period)V rat--Lm(d i
vat/dt) + Rm・i rat...(7)
(C) The voltage error detector 12 simply performs addition and subtraction as shown in equation (8) below.

Output of voltage error detector 12 εvm y rsf+ΔV raw V ah”
``'''' (8) However, ■, ″; Output of DC voltage sensor 6 (D) DC output of power converter 2 Ed=Ks3Cosα Tatami・cost−◆・・・Work (
9) Ed-, ·θ7. ．．・・・・・・・・・
・QΦHowever, Ks, Kg: constant θ1. t; Output α of voltage controller 13; Control angle of thyristor of power converter 2 From the above equation (9) and 0ω, α-arc Cos ((Kg/Ks) ・θ-t)
Therefore, in the ignition phase circuit 14, depending on the output θrat of the voltage controller 13,
The control angle α of the thyristor of the power converter 2 is calculated as shown in equation (11) above.

As shown in FIG. 8 below, the control angle α of the thyristor is controlled by the firing phase circuit as a firing pulse having a phase difference of α in synchronization with the waveform of the AC type R1 detected by the AC voltage sensor 7. It is output from 14.

Further, 1. The DC voltage sensor 6 generally uses a combination of a voltage divider and an isolation amplifier as shown in FIG. 9 to simply detect the voltage between p and n of the DC circuit.

[Problem to be solved by the invention]

Since the conventional one-magnet coil power supply device is configured as described above, the electromagnet sufficiently follows the command of the power standard setting value due to the delay characteristics of the power converter 2 in the current range of around a few percent at the beginning of the rise of the triangular wave. There were problems such as not being able to obtain the coil current i, making it impossible to inject the beam into the SOR.

This invention has been made to solve the above-mentioned problems, and includes a control circuit that includes a voltage reference calculation means for the electromagnetic coil 4, and calculates the voltage reference value V1. ．． is corrected by self-learning tuning. It is an object of the present invention to provide an electromagnetic coil power supply device in which the electromagnetic coil current i follows the current reference setting value with high accuracy at the beginning of the rise and the end of the fall of the triangular wave.

[Means to solve the problem]

The electromagnetic coil power supply device according to the present invention is provided with a memory that stores the error between the output of the current reference setting device one cycle before and the output of the electromagnetic coil current detection means for each time series,
The contents of this memory are accumulated in the accumulation storage means for each cycle in time series, and the current reference adder adds the output of the current reference setter and the output of the accumulation storage means. The control circuit is equipped with a voltage reference calculation means that calculates and corrects the voltage reference value of the electromagnet coil every cycle from the output, the inductance L of the electromagnet coil, and the resistance R, and adjusts the electromagnet coil current by self-learning tuning. This is to match the standard price.

[For production]

The electromagnet coil power supply device according to the present invention stores the error between the output of the current reference setter and the electromagnet coil current in the previous cycle in the memory every time, and performs self-learning tuning in which the electromagnet coil voltage is corrected in advance based on the error. This is executed by the voltage reference calculation means, and it is possible to obtain an electromagnetic coil current that accurately follows the current reference set value at the beginning of rising and the end of falling of the current supplied to the electromagnetic coil of the SOR, and the Enables beam injection.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In FIG. 1, the same parts as in FIG. 3 are denoted by the same reference numerals. A memory 15a that stores the difference between the output 1raf of the DC current sensor 5 and the output of the DC current sensor 5 for each time series; It is composed of an accumulation storage means 15b that accumulates and stores the contents of a in each cycle in time series, a current reference adder 15c, and a voltage reference calculator 15d for the electromagnetic coil 4.

These control circuits 21 are constructed using hardware (H/W) such as an operational amplifier or software (S/W) using a microprocessor.

Next, the operation will be explained. Here, only the differences between the conventional electromagnetic coil power supply device shown in FIG. 3 will be explained with reference to FIGS. 1 and 2.

First, in order to obtain an output current (that is, electromagnet coil current ta) that follows the output i rat of the current reference setting device 8 with high precision, the following control is performed.

That is, the electromagnetic coil power supply device according to the present invention uses the memory 15a of the voltage reference calculation means 15 to calculate the output εi of the current error detector 9 for each cycle using the following equation (13) and FIGS. 2(a) and 2(Cb). As shown in the time series (t=1.
2.3. ...store for each i). Furthermore, this memory 1
The storage contents of 5a are stored in the following (12) by the cumulative storage means 15b.
) and the time series shown in FIG. 2(C) are cumulatively stored every cycle.

t rat” (t) −Σ and five (D<5−n, ε1(t) +11−11 = i raf(t).−
111a(t) +11-11... (13) However, i rar(t) 1m-11; Output of current reference setter 8 l a(t) +ll-11; Output of DC current degree sensor 5 n-2; Subscript n l representing 2 cycles before; Subscript L −1 representing 1 cycle before;
2, 3,...l E ; Number of samplings in one cycle (maximum number of memory usage) K ; Number of operating cycles of the power supply device, and output 1rmt of the current reference setting device 8 and the cumulative storage means The output of 15b is the current reference adder 1
5c, it is added as shown in equation (14) below.

is” (t) = ir*t(t) ten trar”(t)
(14) Next, the voltage reference calculator 15d calculates the output 11' of the current reference adder 15c, the value of the inductance 4b of the electromagnetic coil 4, the value R of the resistor 4a, and the electromagnet Performs voltage magnitude estimation calculation,
The voltage reference value v11 is set as follows.

That is, the voltage reference value V ref is converted to the conventional (6), (
7) Modify equations as shown in equations (15) and (16) below.

The reference value Vraf of the voltage V applied to both ends of the electromagnetic coil 4 when the current starts up is V rat = LL, (d i a”/d t ) +
Re i m'' (15) Further, the reference value V rat of the voltage V required for decreasing the current is output from the voltage reference calculator 15d and is expressed by equation (16).

Vrmt=Lm(dIs”/dt)+R@i
m” ”’ (16) However, between ■ and Vrsf, v, = K・vr@, ・・・・・・・・・・・・
...(17) K: There is a constant relationship.

The calculations or processes expressed by the above equations (12) to (17) are performed every cycle when the electromagnetic coil power supply device operates.

Through self-learning tuning that repeatedly corrects the voltage reference value Vraf of the electromagnetic coil as described above, the above (
13) The output of the current error detector 9 (current error ε
One piece of data i (t) (-1) ) converges to a substantially constant value after m times.

That is, if the current error εr (t) ta-t) is positive at first, then in the next cycle the current reference value is εr (t
) Since the electromagnet coil current i is corrected to become larger by to-z+, the electromagnet coil current i also increases slightly from the previous calculation result, and as a result, in the next cycle, the current error ε1(tL
a-n will be less than last time. Furthermore, the same calculation process is performed in the next cycle, so finally εゑ(1)
≦ε, five ζO.

Additionally, if the current error ε1(1) is initially negative, the current reference value is corrected to be smaller by ei(t), so the electromagnet coil current i also decreases a little from the previous time. Finally, εi (t) ≦ε11. ．． It becomes lζ0.

Therefore, after m times, the electromagnet coil current i becomes approximately equal to the current setting reference value t rat.

As described above, by correcting the voltage reference value Vrmt of the electromagnet coil 4 through self-learning tuning, the voltage reference value of the voltage control loop (-electromagnet voltage v
, ) can be determined accurately.

Therefore, without increasing the total switching frequency (-number of phases) of the power converter 2, the current reference 11. .

The electromagnet coil current i follows with high precision.

can be obtained.

In the above example, the AC power supply 1 and the power converter 2 have been described, but a configuration of a DC power supply and a chipper may be used, and the same effects as in the above embodiment can be achieved.

[Effects of the Invention] As described above, according to the present invention, the electromagnet coil voltage is calculated and set by self-learning tuning based on the current error of the previous cycle. Without increasing the number of magnets, it is possible to obtain an electromagnet coil current that follows the current setting value with high accuracy at the beginning of the rise and at the end of the fall of the current supplied to the 5ORil magnet coil, allowing SOR to be achieved at high speed and with high reliability. This has the effect of making it possible to perform beam injection.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an electromagnetic coil power supply device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the voltage reference calculation means of FIG. 1, and FIG. A block diagram showing the configuration, Fig. 4 is an explanatory diagram of the operation of the electromagnetic power supply device in Fig. 3, Fig. 5 is a block diagram showing the transfer function of the electromagnetic coil power supply device, and Fig. 6 is a block diagram of the voltage minor loop. , FIG. 7 is a block diagram of the current measure loop, FIG. 8 is a waveform diagram of thyristor control, and FIG. 9 is a schematic diagram of the DC voltage sensor. In the figure, l is an AC power supply, 2 is a power converter, 3 is a filter, 4 is an electromagnetic coil, 5 is a DC current sensor, 6 is a DC voltage sensor, 8 is a current reference setter, 9 is a current error detector, 10 is a current controller, 12 is a voltage error detector,
13 is a voltage controller; 15 is a voltage reference calculation means; 1
5a is a memory, 15b is an accumulation storage means, 15c is a current reference adder, 15d is a voltage reference calculator, and 21 is a control circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant: Mitsubishi Electric Corporation - NM Gunnψ ■ School ■ Acupuncture Diagram Diagram Diagram Diagram (2) Figure 3 is corrected as shown in the attached sheet. 7. At least a document stating Figure 3 after the revised list of attached documents

Claims (1)

[Claims] A power converter is connected to an AC power source, an electromagnetic coil is connected to the DC output side of the power converter via a filter, and the magnitude of the voltage of the AC power source is detected by an AC voltage detection means, and the electromagnetic coil is In an electromagnetic coil power supply device, the voltage and current of the electromagnetic coil are detected by an electromagnet coil voltage detection means and an electromagnet coil current detection means, and the firing angle of the power converter is controlled by a control circuit. a current reference setter that determines the magnitude of the current reference setter, a current error detector that detects an output difference between the current reference setter and the electromagnetic coil current detection means, and a current error detector that receives the output of the current error detector from the current reference setter. A current controller that controls the electromagnet coil current so that it is equal to the output current reference value, and a voltage reference calculation that receives the outputs of the current reference setter and the current error detector and determines a reference value for the magnitude of the electromagnet coil voltage. means, a voltage error detector for detecting the difference in the output of the electromagnet coil voltage detection means with respect to the sum of the output of the current controller and the output of the voltage reference calculation means; a voltage controller that adjusts the magnitude of the current error detector to be equal to the voltage reference value outputted from the voltage reference calculation means;
a memory for storing the difference between the output before a cycle and the output of the electromagnet coil current detection means; an accumulation storage means for accumulating and storing the contents of the memory in chronological order; an output of the accumulation storage means and the current; A current reference adder that adds the output of the reference setter and a voltage reference calculator that calculates and corrects the voltage reference every cycle based on the output of the current reference adder and the impedance of the electromagnetic coil. An electromagnetic coil power supply device characterized by: