SU1215102A1 - Multichannel pulse temperature controller - Google Patents

Abstract

The invention relates to the field of automatic control, in particular to the simultaneous control of temperature in a number of objects. The regulator solves the problem of multichannel control according to the principle of sequential cyclic sampling of the values of a given and actual temperature of the control channel cascade while providing parallel pulse-width modulation in the I-channels of control with a sawtooth voltage generator period with simultaneous automatic gain of its gain factor. The controller contains serially connected clock pulses, a frequency divider, a ring counter and a decoder, outputs connected to three groups of keys, a serially connected setting device, a comparison circuit whose thermal input is connected to the second input, a proportional unit, a threshold element and a disk electronic memory devices, as well as a sawtooth generator and variable coefficient setting unit. 1 silt, 3 3. p. F-ly. S with

Description

one

The invention relates to the field of automatic control, in particular to the simultaneous regulation of temperature in a number of objects.

The aim of the invention is to improve the accuracy and reliability of the controller.

Multichannel pulse temperature controller, despite the organization of multichannel regulation on the basis of the principle of sequential cyclic sampling, set values and actual temperatures of each control channel, provides parallel psmt pulse modulation in the control channels with a sawtooth voltage during automatic installation in each channel adjusting its gain.

The drawing shows a regulator circuit.

The controller contains a setting device 1, including a temperature setting unit 2 and a digital-to-analog converter 3, which consists of a binary-to-binary code converter 4, a digital-to-analog converter 5 directly and an operational amplifier 6, a comparison circuit 7, a proportional unit 8, a threshold element 9, sawtooth generator 10, amplifier 11, second key group 12, thermal converters 13-15, first key group 16, discrete storage units 17-19, actuators 20-22, third key group 23, block 24 variable coefficient settings, generator

25 pulses, divider

26 frequency, the second switch 27, the ring counter 28, the temperature setting unit 2 comprises the task set unit 29, the first element OR 30, the random access memory 31, the control channel number set node 32, the first

.switch 33. The controller contains a decoder 34, and block 2 is set and also contains a task input element 35, a key 36, a second element OR 37, a mode setting node 38, a decoder 39 zero, a one-shot. 40, a resistor 41. A quarter of the keys 42 is also entered in the controller.

ten

20

2151022

The regulator operates as follows; in a way.

First, the operator produces a set of setpoint values for each channel of adjustments in block 2 of the setpoint temperature, for which, in setpoint set node 29, the setpoint values are recalled, and in block 32, the number of control channel is dialed. When the task input element 35 is turned on, the ring counter 28 is reset to the initial state, which is fixed by the decoder 39 zero. As a result, ts tata closes key 36 and through

The first switch 33 of the channel number signal from node 32 is fed to the address inputs of the RAM 315 to the control input of which receives a recording mode signal from the output of the mode setting node 38 Similarly, the set temperature for other channels is set.

When the input element 35 is turned off, the ring counter 28 performs a cyclical polling of the addresses of the random access memory 31, as a result of which binary-decimal codes of the set temperature value for each control channel appear at its outputs. The codes returned appear at the time of the TCB with the hT following period. At the output of the digital-to-analog converter 3, analog signals appear, at a certain scale, the corresponding values of the set temperatures that arrive at the input of the comparison circuit 7, the output of the corresponding thermal converter 13-15 enters the second input of the comparison circuit 7 synchronously with the reference signal.

25

thirty

35

40

Synchronization is provided by the second group of 12 keys controlled by the decoder 34.

An analog signal from the output of the comparison circuit 7, proportional to the deviation of the actual temperature from the control channel specified in the V-TOM, is amplified by a proportional block 8, the gain factor for which for each control channel is determined by the corresponding variable of the variable coefficient setting 24.

The threshold element 9 compares the amplified signal of the temperature deviation in the i-channel from the control channel with the current value of the sawtooth voltage of the generator 10, the repetition period T of which is K times the period TQ of the ring counter 28 around. As a result, at the output of the element Tcf 9. An impulse or zero level is formed, memorized by discrete memory blocks 17-19.

The state of each discrete memory block 17-19 corresponds to the state of the corresponding actuating element 20-22. B, during one period T, the regulator performs K polls of each control channel, and the activation time of each actuator 20-22 during period T is proportional to the value of the deviation of the actual temperature from the set one.

In this way, parallel pulse-width modulation of the deviation signals of all control channels is carried out.

When the power is turned on, the random access memory (RAM) 31 is reset using the one-shot 40, the output pulse of which sets the write mode to the RAM 31 and simultaneously connects the increased frequency to the input of the ring counter 28 for quick cyclic polling of the addresses of the RAM 31 o.

The proposed controller allows to increase the control accuracy and reliability by organizing parallel pulse-width control of the temperature W of the control objects.

Claims (4)

1. A multichannel pulse temperature controller containing a series-connected temperature setting unit, a digital-to-analog converter, a comparison circuit, a proportional unit, and a spur element, the output of which is connected to the information inputs of the keys of the first group connected to the information inputs of discrete memory blocks whose outputs are connected to inputs ten 15 20 25 215102 actuators sequentially connected clock generator and frequency divider, ring counter connected to the first input of the temperature setting unit, the second output of which is connected to the input of the decoder connected to the outputs of the control inputs of the keys of the first and second groups, information inputs of keys the second group is connected to the outputs of thermocouples, and the output through the amplifier is connected to the second input of the comparison circuit, characterized in that, in order to increase the accuracy of the regulator, a sawtooth generator, series-connected variable coefficient setting unit and a third group of keys, control inputs of the third group keys are connected to the decoder output, and outputs to control inputs of the proportional unit, the sawtooth voltage generator output connected to the second element , 2. The regulator according to claim 1, from l and —chain- to the fact that the temperature setting block consists of a series-connected set of the task set, the first OR element and a random access memory, the output of which is connected to the first output of the block, and the control - input - with the output of the mode setting node; the address input of the random access memory is connected to the second output of the unit and with the output of the first switch, the first information input of which is connected to the output of the control channel number dialing node, the second information input - to the first input of the block and the control input - to the output of the input element of the task. 3, the regulator according to claim 2, characterized in that, in order to increase the reliability of the regulator, A second switch is inserted into it, 50 information inputs connected to the outputs of the frequency divider, and an output to the counting input of a ring counter, the reset input of which is connected to the third output of the temperature setting unit 55, and the temperature setting unit contains a decoder zero, a key, a single vibrator and the second OR element whose output is connected to input 30 35 40 45 the mode set house, the first input is with the control input of the first switch and with the output of the key connected by the control input via the decoder zero to the first input of the block, the third output of which is connected to the information input of the key and the output of the input elements of the task, and the output of the one-vibration .tor connected to the second input of the second element, and OR to the control input of the second switch. 4. The controller according to claim 1, characterized in that a fourth group of keys is entered into it, and the discrete memory blocks are made in the form of D-triggers, the clock inputs of which are connected via a fourth group of keys to one of the outputs of the frequency divider.