SU824157A1 - Temperature regulating device - Google Patents

Description

 -. one . .

The invention relates to automatic control systems and can be applied for programmed temperature control, for example, for growing crystals. .

A device is known that contains an analog-code converter / including a pulse generator, a sawtooth voltage generating unit connected to the analog-code converter outputs, an OR element connected to the converter inputs. Analog code, a threshold block to which a signal is proportional to the controlled temperature , the output of which is connected to the output of the analog-kodg converter, decoder, start block, control trigger, AND element, binary code generator, rewriter block, control signal driver fishing, i.spolnitelny element 1. ..

The disadvantages of the known device are the complexity of the design, the comparison of the current temperature value with a predetermined value, in addition, the formation of the control signal is not performed continuously, but at certain intervals of the sawtooth voltage, which reduces

temperature control accuracy, as well as device reliability.

Closest to the present invention is a device for temperature control, comprising a pulse generator, the first element AND, a sawtooth voltage shaping unit, a binary counter, a code-analog converter, a threshold block, a comparator, the first element, a second element, the second element, and the second element And, the third element is And, the start-up unit, the control trigger, the driver of the control signals, the executive Zle. cop

After power is turned on, the starting block sets the binary counter, the actuator element, and the control trigger transfers the S state O to the initial state. The pulses from the output of the pulse generator, through, through, the AND element, enter the binary counter. .Because

5, the binary counter output is connected to the code-analog converter input, then each current content of the binary counter is converted into a code-analog voltage converter.

0; thus, at the output of npeoftpaoavtel, the code-analogue gets a step increase, t, e. sawtooth voltage r. This voltage is applied to the first input of the threshold unit, and the voltage d is applied to the second input of the threshold unit. from the output of the temperature sensor, proportional to the parameter being absorbed. At / 5 ° C, there is no signal at the output of the threshold block, the binary counter continues to be filled with pulses from the output of the element And, and so that the voltage / i increases, When voltage p. becomes equal to ° C, i.e. at f5, signal 1 is received at the output of the threshold block, which transfers the control trigger to another state, i.e. state 1. When the control trigger goes to state 1, the binary counter is filled with pulses, and the number currently in the binary counter is a characteristic of the controlled parameter. This number is stored in a binary counter, which corresponds to the voltage p at the output of the code-analog converter. After that, the current value of the regulated temperature, i.e. The EC voltage from the output of the temperature sensor is not consistently compared with the voltage f% in the comparator and in the threshold unit. Depending on the sign of deviation of the current value of the controlled temperature from the setpoint, the device expresses the control signal, the induction increases or decreases the control effect 2. A disadvantage of the known device is that it is limited only by maintaining the temperature j and a certain level allows you to maintain the temperature at a certain level for a specified time, as well as lower the temperature at a given speed for a specified time, which is especially important when growing allov. The purpose of the invention is to expand the functionality of a known device. The goal is achieved by the fact that the device for temperature control contains a temperature sensor, a pulse generator connected in series and a first element I, a trigger unit connected in series, a main control trigger, a second element I, a control signal generator and an actuator element connected in series to a comparator, the first element NOT and the third element AND, as well as the series-connected saw driver, the threshold unit and the second element NOT, whose input It is connected to the second input of the main control trigger, and the output to the second inputs of the second and third elements AND, the output of the sawtooth forming unit is connected to the first input of the comparator, the second input of which is connected to the second input of the threshold unit and the output of the temperature sensor, and the output to the third input of the second element I, the third input of the third element I connected to the output of the main control trigger, and the output to the second input of the control signal generator, the output of the trigger unit is connected to the second input An additional element and the first input of the sawtooth voltage shaping unit, as well as a frequency divider connected in series the first timer, the OR element and the additional control trigger, as well as the fourth And element and the second timer connected in series, the output of which is connected to the second input of the additional control trigger; the inputs of the fourth element And are connected respectively to the output of the main control trigger and the first input of the first element And, the second input of which is connected to the output of the additional An additional control trigger and an output are connected to the first inputs of the first timer and a frequency divider, the output of which is connected to the second input of the saw-tooth voltage shaping unit, and the output of the trigger unit is connected to the second inputs of the OR element of both timers and the frequency divider. FIG. 1 shows a functional diagram of the proposed device; FIG. 2 is a timing diagram of the device operation. The device for temperature control contains a pulse generator 1, the first element I 2, a sawtooth voltage forming unit 3, a binary counter 4, a code 5 analog converter, a threshold unit 6, a comparator 7, per. NOT element 8 is the second element NO 9, the second element is AND 10, the third element is AND 11, the start block 12, the main control trigger 13, the driver of the control signals 14, the actuator 15, the temperature sensor 16, the frequency divider 17, the first timer 18, the fourth element And 19, the second timer 20, the element OR 21, an additional trigger 22 control. The device works as follows. After turning on the power, the start block 12 sets the first timer 18, the frequency divider 17, the binary counter 4, the second timer 20, the actuator 15, and the main control trigger 13 to the O state. In addition, the output signal of the block 12 starts, passing through the OR element 21, transfers the additional control trigger 22 to the state O. Therefore, the main control trigger 13 records the AND 10, AND 11 and And 19 elements, and the additional control trigger 22 locks the AND 2 element, after that using the setting Set, 1 in binary counter 4 navlivaets mouth setpoint perature rate which is necessary to keep under constant during the time T (line BC in Fig. 2), and using Set setpoint. 2 in divider 1. frequency is set to such a frequency value that would correspond to a predetermined rate of decrease in temperature (line GD). Since the output of binary counter 4 is connected to the input of the converter 5 code-analog, then the output of the converter-5 code-analog voltage is obtained {b , the projection of the setpoint temperature t is the voltage applied by the converter I input 5 code-analogue to the first input of the threshold unit 6 and the compressor 7. The second input of the threshold unit 6 and the comparator 7 is supplied with a voltage from the output of the sensor 16 tempera ury. After turning on the heating circuit of the regulated object, the current value of the temperature of age is rising along the line AB. Therefore, the voltage value ot- from the temperature sensor 16 output also increases. At the moment in time, i. when the current temperature value is equal to the given tjQ, ..., the value of ° C is also equal to (b, i.e. | b. At the same time, the output of the threshold block b is a signal that puts the main control trigger 13 into state 1. From this point on, over time T, the device maintains the temperature in the controlled object at a constant value, equal to 1 ° | d- This happens as follows. When the main trigger 13 of the control goes to state 1, elements 10 and 11 will open And AND 19 Therefore, the impulses from the Output of the generator 1 imp pulses passed through the AND 19 element are fed to the counting input of the second timer 20, which begins to measure the time interval T (see Fig. 2). To maintain the temperature in the controlled object at a constant level, the current value of the adjustable temperature, i.e. The voltage ot from the output of sensor 16 is continuously compared with voltage fb. In comparator 7 and in threshold block b (sensitivity of the comparator is chosen greater than or equal to the sensitivity of the noporoBOt-o block). Depending on the sign of the deviation of the current value of the regulated temperature from the set one, the device removes the control signal causing an increase or decrease in the control action. For example, if the current value of the controlled temperature is greater than the specified one, i.e. .that the output of the threshold unit 6 receives a signal. Oh, and at the output of the element is NOT 9 high potentials, i.e. signal 1 Because at this time there is a high potential at the output of the comparator 7, signal 1 from the output of the element HE 9 passes through the element AND 10 and enters the control signal emitter 14, which you block the signal causing a decrease in the control action. When the current temperature value decreases to / 5, i.e., at the output of the threshold unit 6, a signal 1 is received, and the output of the element 9 is a signal O, and therefore there is no signal at the output of both 10 and 11. If the current value of the regulated temperature is less than. given, i.e. CC P, then at the output of the threshold block b is a signal O, and at the output of the element HE 9 is a high potential signal 1. At ° C (i at the outlet of the comparator 7 is low potential; ial, i.e. signal O, and at the output of the element is NOT 8 is signal 1. Therefore, signal 1 from the output of the element NO 9 passes through the element 11 and enters control signal generator 14. When the current value increases, temperature is up to (b, i.e. at oi B, signal 1 is output at the threshold block, and signal 9 at the output of the element is NOT 9, and even 10 at the output of the elements and H11 signal is absent. Further, the temperature control is repeated in a similar way. After the time T, i.e., at time C (see Fig. 2), is out The second timer 20 receives a signal and translates the additional control trigger 22 to state 1. From this point on, for a time f, the device lowers the temperature at a predetermined speed (CD line). This happens as follows. With additional control trigger 22, 1, the element 2 opens, therefore the pulses from the output of the generator 1 pulses, passing through the element 2, arrive at the input of the frequency divider 17 and the counting input of the first timer 18. Thus, the first timer 18 begins to measure the time oh azhdeni T (cm -fig 2). Since the output of the frequency divider 17 is connected to the input of the binary counter 4, then

in accordance with the setting of the mouth. 2 from the output of the divider 17 frequency to the input of the binary counter 4 receives pulses with a frequency f. The frequency of these pulses f corresponds to a given speed, a decrease in temperature, e, e. relation, where l t temperature change, C, l. change time, min. In binary counter 4, the pulses obtained at the output of the Q. 17 frequency bodies 17 are subtracted from the contents of counter 4. Thus, in each pulse period at the output of the frequency divider 17, the contents of binary counter 4 are reduced by the value of L, i.e. after the first pulse period, the contents of binary counter 4 become equal to tzaf and t after the second period (2 t) and T.D. In the time interval LT, which corresponds to the period of the pulse following. At the output of the frequency divider 17, the temperature values are maintained by the device at a constant value in the same way, i.e. in the first period of the pulse tracing, the device supports at a constant value the value (Lzd. –l t) in the second period of the magnitude (t Back 2n t), etc.

Thus, starting from the point C 0 during the time T, the temperature is being simulated at a given speed,

lt ie along the CD line.

The process of lowering the temperature ends at time D. 6 this moment, the content of the first timer 18 reaches the value F. At the same time at the output of the timer. 18, a signal is generated that the Orez element OR 21 sets the additional control trigger 22 to the state O. The additional control trigger 22 blocks the AND 2 element. This process of reducing the temperature at a predetermined speed during the time Td ends and the device returns to its original state. After that, using the setting of Set. 1 in the binary counter 4 again you can set the required temperature value t OA using the setpoint Set. 2, in the frequency divider 17, the desired rate of decrease in temperature can be set, and the progress can be repeated several times.

. The proposed device allows maintaining temperatures at a constant value for a predetermined time, as well as reducing temperatures (cooling) at a given speed for a given time interval / which is necessary in controlling technological processes, for example, in growing crystals.

Since the proposed device is built on digital elements, it practically provides any accuracy of temperature control, as well as any rate of temperature decrease (cooling rate).

The nocTjJoeao device on integrated circuits of the K140, K218, K155, K 198 series and its tests carried out proved to be correct. construction principle and high operational reliability.

Claims (2)

1. Authors certificate of the USSR Iv 547736, cl. G 05 D 23/19, 1977. 2. USSR author's certificate according to application number 2644535 / 18-24, cl. G-05 O 23/19, 1978 (prototype). I1 | ... I. - East..i FIG. f Bpenfl muff