SU1370657A1 - High-voltage generator of raising-to-power function - Google Patents

Abstract

The invention relates to analog computing and measuring devices of experimental physics, in particular to diagnostic devices for studying ion bunches obtained from pulsed plasma. The aim of the invention is to improve the accuracy of the generator. The high-voltage power-law generator contains parallel-connected KS circuits 1 - 1, a discharge resistor 2, 2j, a load capacitor 3, a high-voltage switch 4, the first 5 and second 6 keys, a reference capacitor 7, a time interval converter 8 in the code. RC circuits are implemented in the form of series-connected time of the resistors 9, -9 and the time of the driving capacitors 10, -10. The generator has a start II input, inputs 12 and 13 of the operation mode setting, digital calibration input 14, analog output 15, digital output 16, high voltage bus 17. The achievement of this goal is ensured by introducing two keys into the generator, a reference capacitor and a time interval converter in the code, as well as thanks to the new links between the specified elements. I il. i (L

Description

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The invention relates to analog computing and measuring devices of experimental physics, in particular to diagnostic devices for studying ion bunches obtained from a pulsed plasma.

The purpose of the invention is to improve the accuracy of the generator.

where and} are determined by the form of the function U (t), the number of decomposition elements (exponentials), the decomposition interval;

 - kz g

1. f, -

s- ks

 R.C ,,

 one; 2; 3) - constant time. After decomposition in power

and (p) and, Z

 RL

(BUT)

The drawing shows a block diagram of the polynomials of the numerator and the denominator of the high-voltage generator U (p), which gives the ratio: foam function.

The proposed generator contains parallel KS circuits 1, -1, a discharge cutoff source 2, made in 15 types of voltage divider on resistors 2, and 2, load capacitor 3 with capacitance C, high-voltage switch

4, first 5 and second 6 keys, this- "..

„-. -. ,, lays when comparing expression (3)

lonny capacitor 7 and convert- / Oh ,, h .. l i /,

and (4). Suppose 1 1 µs (see formula

The correspondence between the given values of 0,

1 and parameters elekt0

a f circuit and C are a time interval setting in code 8. The KC circuit 1,1 KJ is made in the form of series-connected time specifying

resistors 9, -9y and the time of a given con, ". 74 constant time i. , Cl, C,

capacitors 10, -10 ,,, performed digits. ,, ", To" "," ".," ",." ° "managed. The number of RC circuits 1, -1 is determined by the number of exponentials approximating the required function.

(in this case, the number is approximated by

, x „qn change by m times, then it is necessary that preserve the exponents N + 1). Ienerator chen and g-I-uifR tr Zhr chn chrny ggggpptmpprnny-

start input 11, inputs 12 and 13 of the setting of the operation mode, digital caliber (1) and compared the expressions (3) and (4), we find from the approximation parameters σ k and the value

which allows selection of resistor and capacitor resistance values. If you want to increase (decrease) the value of the constant

The same resistance values of the resistors, increase (decrease) by m times the capacitance values of the capacitors.

Auxiliary input 14, analogue output 15, digital output 16 and high voltage bus 17.

The generator is capable of generating voltage pulses.

U (t)

(

(1) 40

where T is a constant of time;

and - the amplitude of the generated pulses;

n - exponent (p O). When the high-voltage switch 4 is opened at the generator output, a voltage pulse is generated, equal to the cvMMe

U (t) U (, X .V, exp (),

k

OR in Laplace operator form;

them . t -7 (

U (p) Pt / -

-t- - + p z

and (p) and, Z

 RL

(BUT)

The correspondence between the given characters "..

cheni mi 0

1 and parameters elekt0

the rational schemes of f, and C, by setting (1) and matching the expressions (3) and (4), we find from the approximation parameters known about k and the values

,, ", To" "," ".," ",." ° "

which allows selection of resistor and capacitor resistance values. If you want to increase (decrease) the value of the constant

uifR tr zhr chn chrny ggggpptmpprny

The same resistance values of the resistors, increase (decrease) by m times the capacitance values of the capacitors.

The generator has 2 modes: working and calibration.

Work mode.

Key 3 is open, and key 6 is closed. In the initial state, the high-voltage switch 4 is closed. With the arrival of an impulse, Start at input 11 opens the key 4 and at output 15 a voltage is generated

N-11

U (t)

kr

"Exp (- / ifct),

(five)

where N is the number of RC circuits 1, -1 „, 0 and /, are the parameters of the transient process.

The correspondence between the parameters d, b, and time constants C ,, (C,,;, K, C ";" R, C "k 1, .., N) is determined from relations (3) and (4), Function (5) is approximation for the desired power function.

Calibration mode.

313706

The need for periodic calibration is associated with temperature and time drift, as well as uncontrolled changes in the external conditions of the experiment. For example, the value

The parameter i depends on the input capacitance of the deflection plates of the electrodynamic analyzer, which is known only approximately and the magnitude of which depends on various causes. Calculations make it possible to make an indication of the significant sensitivity of the form of the generated function to changes in the parameters f, G and. Therefore, the long-term accuracy of the setup and the maintenance under experimental conditions of the necessary values of the constant times is decisive for the reliability of the experimental data.

Any value of constant time Oj can be represented by a linear combination of binary-weighted bit-weights of the form:

1 S l 1. -. ,,

O where IK is the i-th bit weight k O, 1, ..., N.

Calibration is performed separately for each k value, i.e. when measuring C, the keys of all other digitally-controlled capacitors 10, - 10 N of the KS-circuits l, - ,, except k-x, are disconnected. Measuring the transient time constants is performed by applying a start pulse to input 1I. In this case the high-voltage switch 4 is opened, the time converter 8 is started into the code and an exponentially falling transition is generated, the time constant of which is measured by converter 8.

Calibration is carried out as follows.

I. The value t ° of the difference between the value of the reference value

by the time Ij, -,

and maximum

. -

This estimate is made from two measurements. The first measurement is the measurement of the value is performed with the key 5 closed, the key open 6 and the zero input code supplied to the digitally controlled

the capacitor of the k-th calibrated KS circuit It (all keys are open). The second measurement, the measurement of the total amount, is made with open keys 5 and 6 and the maximum input code at input 14.

2. Determine the value t of the difference of the most significant bit weight and the sum of all smaller bit sizes:

1 r2

This estimate is also made from two measurements. The first measurement is for input code 100 ... 00 at input 14, the second measurement for input code is 011 ... II via the same input.

Next, the value t of the difference between the next weight and the sum of all smaller bit weights is determined from the results of two measurements with input codes 010 ... 00 and 001 ... II, respectively, at input 14. Then,

the value of the third difference t

then

thirty

t etc. up to t 7 of the 1st difference

And some

35

is made according to the results of two measurements with input codes 00 ... OIO ... 00 (the unit is in the 1st place of the word) and OO ... OOK. 1.1.

3. Calculate the true values of bit balances G according to the recurrence relation:

 (. -

H 2 to

+ t

- t

s

),

50

moreover, calculations are made from the determination of the magnitude of the highest bit weight, which is determined after:

about s (l + t 1 2 3 f

tp.

and the transition to smaller scale weights. This procedure is carried out for all KS chains I, -1 and chains 2-3 (Ro - Co).

The measurement results are fed through an output 16 of the generator to a calculating device, which controls the calibration process and calculates the true values of the discharge weights.

The integral nonlinearity ui of reproduction O is evaluated by the relation:

& g (n +) / 5t,

where 51 is the maximum measurement error t

n is the number of calibrated discharge weights.

To measure the time constant of the exponentials for this generator, a time converter in the code with an integral nonlinearity of 10 was used. In this case, the error t is tenths of nanoseconds. Thus, when the number of calibrated weights p

JO, and the control input is the generator start input, characterized in that, in order to improve accuracy, it contains the first and second keys, the reference point

) 5 sensor and time interval converter to the code, the start input of which is connected to the generator start input,. and the output is its digital output, the discharge resistor is made in

20 is a voltage divider type, the average output of which is connected to the information input of the time interval converter in the code and connected to one of the plates through the first key, standard 10 integral nonlinearity error of the 25 capacitor connected is l il nsec.

The other plate to the zero-potential bus, the time specifying the capacitors of the RC circuits and the load capacitor, are made digitally-controlled and the sub-high voltage generator cTei Shoy 30 is connected by control inputs to the formula of the invention

functions, containing N parallel KS circuits, each of which is filled in series in the time of the master resistor and the master capacitor time, the discharge resistor connected in parallel to the RC circuit, the load capacitor, the first plate of which is connected to

the analog output of the generator, and the second plate is connected to the zero potential bus and the combined plates of the time of the driving capacitors

KS circuits, and a high-voltage switch, two information outputs of which are connected respectively to the combined terminals of the time of the driving resistors of the RC circuits and the high voltage bus

and the control input is the generator start input, characterized in that, in order to increase accuracy, it contains the first and second keys, the reference point

The sensor and the time interval converter to the code whose start input is connected to the generator start input,. and the output is its digital output, the discharge resistor is made in

As a voltage divider, the middle output of which is connected to the information input of the time interval converter in the code and connected to one of the plates of the generator calibration reference input through the first switch, the second switch is connected between the combined outputs of the time of the driving resistors of the RC circuits and the analog output of the generator, and the control inputs of the first and second keys correspond to the inputs for setting the operating modes of the generator.

Claims (1)

Claim A high-voltage generator of standard function 30, containing N parallel-connected RC circuits, each of which is made in the form of a series-connected time-setting resistor and a time-setting capacitor, a 35-bit resistor connected in parallel to RC circuits, a load capacitor, the first lining of which connected to the analog output of the generator, and the second plate is connected to the bus of zero potential and the combined plates of the timing capacitors of the RC circuits, and a high-voltage switch, two information outputs of which are connected respectively with the combined terminals of RC timing resistors and a high-voltage bus — 10, and the control input is a generator start input, characterized in that, in order to improve accuracy, it contains the first and second switches, a reference capacitor and a time interval converter into a code whose trigger input is connected to the generator trigger input,. and the output is its digital output, the discharge resistor is made in the form of a voltage divider, the middle output of which is connected to the information input of the time interval converter into code and through the first key is connected to one of the plates of the reference capacitor, connected by another plate to the zero potential bus, RC timing capacitors -chains and load capacitor are digitally controlled and connected by control inputs to the digital calibration input of the generator, the second key is connected between the combined A output of timing resistors RC-circuits and the analog output of the generator and the control inputs of the first and second keys correspond to the inputs of the generator operation mode assignment.