SU723535A1 - Device for automatic regulation of physical values - Google Patents

Description

one

The invention relates to automation and can be applied in systems of automatic control, for example, the temperature of thermostats of precision quartz oscillators with a short time to enter the mode.

Control devices are known that contain a sensor, a conversion device, a device defining the reglating law, and an actuating device 1, (2) and 3.

A disadvantage of such devices is that they can support only one predetermined value of the controlled parameter. The use of such devices, for example, as thermostats for quartz oscillators, leads to the fact that an initial heating of the thermostat to a predetermined temperature, i.e. it takes a long time to prepare a thermostatted crystal oscillator for operation. In this case, reduction of the preparation time is possible due to an increase in the heating power, the value of which is limited by the permissible heating rate of the quartz resonator. Thus, when the thermostat is heated to 120 ° C, the time for the generator to go into operation cannot be less than 15-20 minutes with a heating power of about 30 watts.

A device is known for connecting a thermostat to one of two bridge circuits tuned to different temperatures, containing two bridge circuits and a device for connecting a thermostat to one of them depending on the imbalance of the bridges 4.

The disadvantage of such a device is that the range is divided into two sub-bands, with the temperature of the balances of the bridges being relatively widely spaced. The advantage of this device when it is used for thermoregulation of quartz oscillators is the reduction of the time required for the operation of relatively single-temperature regulators.

Claims (5)

The closest is a device consisting of a pulse generator, a switch, a step voltage shaping unit, the output of which is connected to the first input of the threshold element, the temperature sensor is connected to the second input, and one of the outputs is connected to the first input of the switch 15. 37 This device allows the thermostat to maintain the temperature that was there when the thermostat was turned on. When using such devices as thermostats For quartz oscillators, the time needed to prepare a quartz oscillator for operation is reduced to almost zero. However, the frequency rating of a quartz oscillator depends on the switching temperature and can be adjusted by a temperature compensation system of medium complexity with an accuracy of no more than 17-1. The purpose of the invention is to improve the accuracy of the device. The goal is achieved by the fact that the device contains a coincidence element and an initial state setting block, the output of which is connected to the second input of the switch and the first input of a step voltage shaping unit, to the second input of which the output of the coincidence element is connected, the first and second inputs The element coincidence is connected respectively to the outputs of the pulse generator and the switch. FIG. 1 shows a block diagram of the device; in fig. 2 - timing diagrams for the operation of the device. The device contains the initial state setting unit 1, the switch 2, the coincidence element 3, the 4 pulse generator, the step voltage shaping unit 5, the threshold element 6. The device operates as follows. When the power is turned on by the signal from the initial state setting unit, the switch 2 is set to the state that opens the coincidence element 3 for passing pulses from the generator 4 to the step voltage shaping unit 5, which is set by the initial setting signal to the O state. The step voltage unit 5 is supplied to the input of the threshold element 6, to the other input of which a voltage is supplied from a physical quantity sensor proportional to the value of the controlled parameter. The signal at the output of the threshold element 6 occurs in the case when the voltage from the sensor exceeds the voltage of the step voltage shaping unit 5. In the opposite case, a signal appears at the output of the b element of the threshold element 6, In the initial moment (when the voltage at the output of block 5 is zero) there is a signal at the output of the threshold element 6. At the time when the voltage at the output of block 5 raises the voltage from the sensor, the state of the outputs of the threshold element 6 is reversed. The trailing edge of the output from the terminal element 6 tilts the switch 2, closing the element 3 matches. Thereafter, the flow of pulses to the stage 5 of formation of stumenchatuyu voltage in the future, the voltage at its output will stop unchanged. - The signals from the outputs a and b of the spring element 6 control the actuator, changing the direction of the action. In the case of using the device as a thermostat, the time to enter the mode corresponds to a change in temperature by an amount corresponding to the voltage difference from the sensor and from the 5-Di unit (Fig. 2). To decipher the state of the step voltage shaping scheme, one may include one or other corrective measures, adjusting the frequency of the thermostatically controlled quartz oscillator. A change in the number of fixed values can be achieved by varying the volume of the step voltage shaping circuit. The use of the proposed thermostatting device for quartz oscillators allows to obtain a small output to the mode with a high accuracy of setting the frequency rating. Claims The device for automatic control of physical quantities, comprising a pulse generator, a switch, a step voltage shaping unit whose output is connected to a pivot input of a threshold element to a second input of which a physical quantity sensor is connected, and one of the outputs is connected to the first input of a switch. that, in order to increase accuracy, it contains a coincidence element and an initial state setting block, the output of which is connected to the second input of the switch and the first input row block forming the stepped voltage to the second input of which is connected to the output of matching member, wherein the first and second inputs of the coincidence element are connected respectively to the outputs of the pulse generator and the switch. Sources of information taken into account during the examination 1. USSR author's certificate N 393457, cl. G 05 B 11/28, 1% 6. 2. USSR author's certificate number 211173, cl. G 05 D 23/24, 1952. 3. USSR Author's Certificate No. 446045, 05 D 23/19, 1976. 4. Accepted for Germany N 1523281, cl. G 05 D 23/24, 1971. 5. USSR author's certificate in application N 2153666/24, cl. G 05 D 23/19, 1975 (prototype). D to) I Ppppp - - t 1 I 1 - ft