SU935889A1 - Temperature regulator - Google Patents

Description

154) TEMPERATURE REGULATOR

one

The invention relates to temperature control, specifically to devices for automatic temperature control in thermostats.

Thermostat temperature controllers are known that use two thermistor as temperature sensors, included in one bridge circuit 1.

However, such inclusion of temperature sensors does not allow to achieve high accuracy of temperature maintenance with a sufficiently small time to reach the temperature regime of a wide class of thermostatically controlled systems.

The closest to the proposed one is a temperature controller containing two bridges, one of the arms of which includes a thermal sensor, and the other of the gauges. The automatic adjustment of temperature recovery programs is carried out with the help of a control temperature sensor and a reference setpoint device, included in the bridge, the diagonals of which. through an amplifier and a mechanical pushbutton, the element is connected to the control unit of the other bridge t2.

However, the adjustment of the program with the help of a single control temperature sensor and a setting device does not allow one to fully take into account the dynamic properties of the control object, dates and actuators included in the closed control loop. In addition, mechanical control of the setpoint resistance through the amplifier and the actuator leads to a delay in the processing of the correction signal. All this significantly increases the error of stabilization of the controlled parameter and the time it takes for the system to become operational.

The purpose of the invention is to show the accuracy and speed of the device.

The goal is achieved by

Claims (2)

20 that a power amplifier is serially connected to a temperature regulator containing two bridges with a sensor and a temperature setter in each one. to the input of the differential drive and through the voltage divider unit to the first input of the comparator unit, to the second input of which the output diagonal of the second bridge is connected, and the output of the differential the amplifier is connected to the input of the power amplifier. FIG. 1 is a block diagram of a temperature controller; in fig. 2 curves of the temperature of the thermostatic system as a function of time when moving from one operating point to another. Temperature controller for thermostat 1 contains sensors 2 and 3 temperature bridges 4 and 5, voltage divider unit 6, comparison unit 7, differential amplifier 8, power amplifier 9 actuator (heater cooler) 10. Temperature control sensor 2 and reference sensor 3 temperatures are set respectively in the zone of the heater-cooler 10 and directly in the thermostat's working area. The required temperature level is set using setpoint n time controllers. of dual precision resistors 11 and 12, the control signal from bridge 4 is one, temporarily arrives at the input of the differential: the power amplifier 8 and the voltage dividers 6, which consists of two independent dividers connected in parallel. The first divider, formed by a series of resistances, allows discretely, and the second divider, made on a precision potentiometer and resistances, allows you to smoothly set the magnitude of the reference signal. The choice of the optimal value of the reference signal arriving at the comparison block 7 is made, based on the stability conditions of the controller operation. The comparison block 7 is an amplifier. direct current with a transfer ratio close to unity. Another input of Comparison Block 7 & The voltage of the unbalance of the bridge 5 is set. The error signal from the output of the comparison unit 7 nocfiyna & r to the second input of the differential amplifier 8, corrects the program depending on the difference of the reference signal and the signal of the control sensor. This allows the invariant component to be introduced into the temperature control program, which takes into account the dynamic properties of the control object, temperature sensors, and performs the element Yu. Figure 2 shows curves 13 and 14 of the time dependence of the temperature τ of a controlled-constant system when switching from one operating point to another. Curve 13 is the dependence of the system temperature on time, and using the proposed controller. Curve 14 represents a similar relationship for a controller made according to a pattern similar to that known. The graphs of curves 13 and 14 show the difference in setting the operating temperature for the two regulators. The amplitude of temperature fluctuations is significantly reduced, the time for the system to reach its operating mode is significantly reduced. The use of this temperature regulator in thermostats and cryostats has an advantage over the known ones, since this controller is simple in design and adjustment in operation and has a rather high temperature stabilization accuracy, which allows it to be used when calibrating temperature sensors and other precision studies. The formula of the image and the Regulator of the tech-course, containing two bridges with a sensor and a temperature setter each, connected in series to the power amplifier and the actuating element, are also distinguished by the fact that, with a circuit of power and speed, the unit voltage dividers, a series-connected comparison unit and a differential amplifier, the output diagonal of one bridge connected to the first input of the differential amplifier and through the divider unit directly to the first input of the block with avneni, to the second input of which is connected the output of the second bridge diagonal, and the differential amplifier output is connected to the input of the power amplifier. 5 Sources of informational taken into account during the examination 1. G. Veshosh, L. L. KyraiK and D. Maleeev, I. Precision circuit diagram X A 93568 & control on integrated circuit. PTE, 1975, No. 4, p. 222-223. 2. Angora certificate of the USSR No. 272700, cl. G 05 D 23/24, 1970 $ (prototype). 1B.1 -Ш2 2 t 6 8 10 12 1 "ff i (nuH) pui.t