SU1246286A1 - Device for controlling power regulator - Google Patents

Abstract

The invention relates to electrical engineering and can be used to build automated control systems for process equipment operating in the direct digital control mode. The aim of the invention is to increase control accuracy. From the output of source 2, the alternating voltage and (t), which is a periodic function of time with period T, is fed to the input of the controlled valve 1 and to the input of the zero organ 4. Once during the period at the moment of voltage transfer U (t ) through the null organ 4 produces a pulse closing the controlled valve 1. The transition of the controlled valve 1 to the open state occurs on a signal from the output of the circuit 5 comparison of codes. This signal is generated at the moment of equality of the input code that arrives at the second group of inputs of the code 5 comparison circuit and the c code (L

Description

bits of the binary subtractive counter 6. The device provides a linear dependence of the output signal on the input control code and the independence of 6 tons of changes in the amplitude and shape of the output voltage 1

The invention relates to electrical engineering and can be used to build automated control systems for process equipment operating in the direct digital control mode.

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

The drawing shows a functional diagram of the device.

A device for controlling a power regulator made on controlled valve 1 with unlocking and locking control inputs connected between an alternating voltage source 2 and a load 3 contains a zero-organ 4 whose input is connected to a source 2 and the output is energized to the positive input of the valve 1, the unlocking input of which is connected to the output of the code comparison circuit 5, the first group of inputs of which is the device input, and the second group of inputs is connected to the outputs of the binary subtractive counter 6 pulses, the cat input It is connected to the output of the zero-body 4, and the information inputs to the outputs of the binary summing counter of 7 pulses, the input input of which is connected via the delay element 8 to the zero-output output 4, and the counting input together with the counting input of counter 7 is connected to the output voltage-to-frequency converter 9 (PKC), whose input through the voltage quadrant 10, is connected to source 2. The control valve can be implemented, for example, on a polarized relay, the direct winding of which is unlocking and the reverse one - locking the control E inputs. point 2., supplying the load, which allows to improve the accuracy of load power control and to ensure high quality of technological processes. silt

0

five

0

five

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The device works as follows.

From the output of source 2, the alternating voltage U (t), which is a periodic function of time with a period T, is fed to the input of the controlled valve 1 and to the input of the zero-organ 4. Once per period at the time of the voltage transition U (t ) through Zero, when the polarity and (t) change from negative to positive, the zero-body 4 generates a pulse that closes the controlled valve 1 and rewrites the information from the information outputs of the binary summing counter 7 into the binary subtractive counter 6, after which her delayed yes delay element 8, this pulse arrives at the installation input of the binary totalizer 7 and sets the latter to the zero state.

At the same time, the voltage U (t) is fed to the input of the analog quad 10, from whose output a voltage proportional to U (t) is fed to the input of the voltage-to-frequency converter 9. From the output of the voltage-frequency converter 9, a pulse signal with a frequency f (t) kU (t) is fed to the counting inputs of counters 6 and 7 (k is the proportionality factor of the conversion of the series-connected analog quad 10 and the voltage-frequency converter 9. Hz / AT ).

Since the value of the output code N (t) from the bits of the binary subtractive counter 6 at any time is the difference between the code present on the outputs of the bits of the binary sum counter 7 at the end of the limit

of the previous period T and rewritten at the beginning of the period under consideration into the binary subtractive counter 6, and the code corresponding to the number of pulses received at the counting input of the binary subtraction counter 6, from the output of the voltage-frequency converter 9 from the beginning of the period under consideration,

N- (t)

J dN - I dN

. tr

t

OR N (t) I f (t) dt-Jf (t) dt.

 -To

Learn that f (t) kU (t) we have

. t

N (t) k (f U (t) dt-J U (t) dt).

-T

From the condition that U (t), and consequently, U (t) is a periodic function of time, it follows that

and

JW (t) dt ju (t) dt and N (t)

-t with

Tt

k (| u4t) dt - / u (t) dt)

or

N (t) kju4t) dt,

t

(one)

The transition of the controlled valve 1 to the open state occurs at the time t according to the signal from the output of the code comparison circuit 5, which is generated when the input code Nj arrives at the second group of inputs of the code comparison circuit 5, and the code N (t) with the bit Dov binary subtractive counter 6, i.e. out of equality

N

N (t) or taking into account (1)

in

Ng, k I U (t) dt ..

(2)

In this case, the value (for the period ipr - 55 lution U (t)) of the power dissipated in a load with resistance R is defined as

P 1 f

sr t J, R

dt

and taking into account (2)

P N ,. kRT

(3)

From expression (3) it can be seen that the value of the average power allocated to the load 3 for the period T does not depend on the shape and variations of the amplitude of the voltage at the output of the source 2.

Thus, the device provides a linear dependence of the output signal on the input control code and independence from changes in the amplitude and shape of the voltage at the output of the source 2 supplying the load, which allows to increase the control accuracy of the load power and to ensure higher quality processes.

Claims (1)

25 claims 0 five 0 five A device for controlling a power regulator made on a controllable valve with unlocking and locking control inputs connected between an alternating voltage source and a load, containing a zero-body whose input is connected to an alternating voltage source, and the output is intended to be connected to the locking input of the controlled valve, the unlocking input of which is intended to be connected to the output of the code comparison circuit, the first group of inputs of which is the input of the device, and a binary totalizing counter and Pulses, characterized in that, in order to increase control accuracy, it is equipped with a voltage quadrant, a voltage-to-frequency converter, a binary subtractive pulse counter and a delay element, the input of which, together with the installation input of the binary subtractive pulse counter, is connected to the output of the zero-organ, and the output to the installation input of a pulse counter, the outputs of which are connected to the information inputs of the binary subtractive pulse counter, the outputs of which are connected to the second group of inputs with emy code comparing and counting input with S12462866 the counting input is a binary summing frequency, the input of which is connected via a quad pulse counter to a voltage torch and connected to a source output of a voltage to an alternating voltage converter.