SU1251314A1 - Switching device - Google Patents

Abstract

The invention relates to the field of pulsed technology. Designed to monitor and control temperature, light, and other quantities. The aim of the invention is to increase and stabilize the output power level. In the device containing triac 1, anode load 2, terminals 3,4 of the mains supply, source of 5 voltages, the third voltage divider formed by the variable resistor 10 and the resistance sensor. 1, the first and second voltage dividers are a single junction transistor 13, an operational amplifier 12, a bipolar transistor 16 and new connections are introduced to achieve this goal. The first and second voltage dividers are respectively supplied from resistor 6, potentiometer 7 and resistors 8.9o. Source 5 is formed by a ballast capacitor 20, a filter capacitor 21, a diode 22 and a zener diode 23. The goal is achieved by converting the sensor into stable and high frequency pulse packets. The value of the adjustable temperature is set using a potentiometer 7s. Resistors 10 and 6 compensate for the variations in resistance and the temperature resistance coefficients of the sensor 11, 1 sludge. with tasA 4. H ± 3 ± t

Description

The invention relates to and -.- puls technique and pre-nazi for ontrol and regulator, hemgteratura illumination each other: -g values.

The purpose of the invention is to test and stabilize the same power as a proxy; - not from the sensor in the impulse packets -; - owl and the frequency

In the drawing before. lr 11-; electric power circuit

The switch-on device has a triac 15 connected in series with the anode load 2 between the terminals 3 of the power supply network, which is connected to the input of the rectifier 5 of the rectified voltage. The first-j divider of the voltage from the resistor 6 and the potentiometer 7 and the second voltage divider from the resistor 8 and 9 are connected to the output of the source 5, the third nagging divider is connected with a variable resistor 1 O and resistance sensor (thermistor) i connected to the movable terminal of the potentiometer 7. I

The output terminal of the operadion amplifier 12 is connected to the emitter of the uni-transistor 13 (OPT) 13 through a resistor 4 that specifies the serial RC circuit, whose capacitor 15 is connected to the negative source of the source 5, the emitter of the bipolar transistor 16 and the output of the first resistor 17j another output which is connected to the first base OPT 13 and the base of the transistor 16c. The second base of the OPT 13 and the cathode of the thermistor 1 are connected to the positive terminals of the source 5, The input pins of the operational amplifier 2 are connected to the middle points of the second and third voltage dividers. A resistor 18, B is connected between the high and non-inverting input pins of the operational amplifier i 2, the Eistor 16 collector is connected to the triac control electrode via the third resistor 19.

Source 5 is formed by ballast-g capacitor 20e, filter capacitor 21, diode 22 and zener diodes: 23

The device works in the following way:

When the device is turned on in the network under the operation of nagf groom on kleg-tma:; {..

and

3

3 and l through the condensation: a1-or 20 and stabilized lg 23 a alternating current flows, N, ayution, the voltage drop across the zener diode 23. The filtering capacitor 2 is charged through the diode 22, from which power is supplied - Chistorov 658.9 and potentiometer 7, comparator, vy1; olennn-on on the operational amplifier 2, heg-generator pulse-; ; s, composed OPT 13, resis-1 and 1 and konde} to: ator 15, and the transistor b. 7-temperature in the installation area of the thermistor 11 is higher than the specified 9 then the resistance of the sensor I1 is small and, therefore, most of the voltage is set on the resistor 10, On the resistors 8 C-9 g-g of the source of 5 d, approximately half-and-half. , ecju-i thermistor temperature resistor; Oude-1 is set preset, then it is inverted at its input — operational force, body 12 with respect to its inverted input — (—bet positive temperature, and output voltage of onepaiu-fOHHoro amplifier 12, t. e,; and the output of the KO circuit will be small. In the case of the capacitor 15 is practically discharged, and the OPT 13 will not be periodically unlocked. Therefore, the transistor 16 and the triac I are locked, the load 2 is disconnected

If the temperature decreases; voltage drop -: and the thermistor 1 1 will exceed the voltage drop across the resistor 8, therefore, on the inverting input -. operational amplifier 12 for Wits positive potential. On the output of the operational amplifier 12, to which the HC circuit is connected, the load on the operadion amplifier 12j increases dramatically. Under the action of this voltage, through the resistor I4, the capacitor 15 is charged and the OPT 13 starts periodically with a frequency determined by the charging time of the capacitor 5 to the unlocked threshold of the OPT 3, from - P -: capacitor 5, discharges to resistor 17, As a result, voltage pulses are generated on resistor 17. These pulses are amplified by the power of the transistor 16, and under sludge the action is opened by the sycistor I and the load is turned on (the heating element) 2. The frequency of the triac control pulses, J significantly (100 times) exceeds the network frequency. Due to this, the systor 1 is opened at the beginning of each half-period of the mains voltage, and almost the entire mains voltage is released in the load 2.

When switching the operational amplifier 12 part of the potential from the output through the resistor 18 is fed to the non-inverting input. By

this after re-operation

A power amplifier 12 slightly increases the potential at its non-inverting input, and therefore the temperature switch is turned off when the temperature in the thermistor 1 zone increases by a certain amount equal to the return zone (differential) between the temperature on and off of the temperature switch. The size of the return zone can be varied with resistor 18,

When the temperature in the installation zone of the thermistor increases by the size of the return zone provided by the resistor 18, i.e. when the voltage drops across the thermistor 11

will decrease by the amount of potential overload at the non-wiring input of the op amp in relation to its inverting input, the op amp 12 will switch, the OPT 13 will be periodically unlocked, the triac 1 will close and the load will be disconnected .-: - ka 2.

Using the potentiometer 7, the setpoint of the controlled temperature is set. Resistors 10 and 6 compensate for variations in the coefficient and temperature coefficient of the sensor 11.

Claims (1)

Invention Formula A switching device containing a triac connected in series with the anode load between Editor N.Slobod nickname Compiled by M, Shchedrin Tehred L. Serdyukova Order 4426/58 Circulation 816 Subscription VNIZhSH State Committee of the USSR for inventions and discoveries 13035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Project St., five ten  5 20 25 zo 35 power supply terminals to which the input of the rectified voltage source is connected, the first and second resistive voltage dividers connected to the output of the rectified voltage source, the third voltage divider formed by a variable resistor and a resistance sensor and connected to a movable potentiometer output of the first resistive voltage divider, single-transistor, the bases of which through the first resistor are connected to the output of the rectified voltage source, the time specifying the CS-circuit b, the midpoint of which is connected to the emitter of the single junction transistor, the second and third resistors, characterized in that, in order to control and stabilize the output power level, an operational amplifier and a bipolar transistor are inserted in it, and the input amplifiers of the operational amplifier are connected with the middle points of the second and third voltage dividers, the output terminal of the operational amplifier is connected to the output of the resistor, the time of the master KS circuit and through the second resistor is connected to the non-inverting in one view of the operational amplifier, capacitor output, the driver time of the serial RC circuit is connected to the negative output of the rectified voltage source, the emitter of the bipolar transistor and the output of the first resistor, the other output of which is connected to the first base of the single junction transistor and the base of the bipolar transistor, whose collector the third resistor is connected to the control electrode of the triac, the cathode of which is connected to the positive side of the rectified voltage source Proofreader A. Obruchar