SU1387144A1 - A.c. voltage controlled converter - Google Patents

Description

(21) 4121119 / 24-07

(22) 06.23.86

(46) 04/07/88. Bul № 13 (72) I. G. Gumerov

(53) 621.314.2 (088.8)

(56) Lenk J. Electronic circuits. M .: Mir, 1985, p. 241, fig. 87

USSR author's certificate number 1056171, cl. G 05 F 1/66, 1983.

(54) AC ADJUSTABLE VOLTAGE TRANSMITTER

(57) The invention relates to electrical engineering. The purpose of the invention is simplification. At the beginning of each positive half cycle of the input voltage, the capacitors of block 7 are charged. The voltage at the output of block 7 increases by the value of AU each period. When the voltage at the output of block 7 reaches a predetermined level, the blocking generator at the unijunction transistor 8 generates a current pulse including a thyristor switch 4. The number of half-periods at which the thyristor switch 4 is closed, regulates the output voltage. This goal is achieved by simplifying the construction of a frequency divider consisting of a rectifying diode 2, resistors 5, 6, 9-11, block 7, a capacitor 12 and a one-way transistor 8. 3 Il.

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The invention relates to electrical engineering.

The purpose of the invention is to simplify the device.

FIG. 1 shows a circuit diagram of the device; in fig. 2 is a diagram of a storage unit, in FIG. 3 - timing diagrams for the operation of the device.

The device contains input terminals 1 connected in series for a subclub, the division factor of the frequency divider can be adjusted by a resistor 10, which is made controllable. When a single junction transistor 8 is triggered, a capacitor 17 quickly discharges, the single junction transistor 8 opens and voltage pulses are removed from resistor 11 through a separating diode 13, opening a thyristor switch 4. At the same time, alternating voltage, rectifying current 3 (Fig. 3) is similar in shape to semi-transient diode 2, load 3, and thyristor to the mains voltage with a frequency equal to the division factor set by resistor 10.

Claims (1)

Invention Formula An adjustable AC voltage converter containing a thyristor switch connected between the input and output pins connected to the input Block 7 contains a capacitor 14, a diode 15 connected between a capacitor 14 and a common output, a diode 16 connected by an anode to a capacitor 14, a capacitor 17 connected between a cathode of a diode 16 and a common output, and a zener diode 18 connected between the input of a capacitor 14 and a common output . The device works as follows. 25 a key 4, a resistive divider on resistors 5 and 6, to the midpoint of which a cumulative block 7 is connected, the output of which is connected to the emitter of a single junction - transistor 8, which forms a blocking oscillator with a voltage divider with resistor 9-11 and capacitor 12 , connecting the output of the blocking generator with the control electrode of the thyristor key 4. Block 7 and the blocking terminal 20 and the generator connected in series form a frequency divider. rectifier and magnitude converter voltage, a frequency divider, the output of which is connected to a control electrode of a thyristor key, characterized in that, for the purpose of simplification, the rectifier and voltage transformer are made in the form of a rectifying diode connected in series in the power circuit of the diode and resistor divider, the frequency divider is made in the form of a serial circuit from the appearance of the first half-wave input from the diode and the first capacitor, the high voltage of the alternating current Ui turned off by the free output to the average divided by the resistor 5 and 6 odnopolupe- point of the resistive divider, the second concentration-period voltage pulses normalized capacitor, the second diode, the zener diode, per- zuyuts, i.e. lead to the trapezoidal terminals of which are connected with a certain amplitude, and then to the free output of the first one is fed to block 7, the output of which is under the .35 common point of the first diode and the first switch to the emitter of the single junction transistor and the free output of the first resistor 8, operating in a threshold re-capacitor, and the second pins are combined press. They form a common output connected to the cathode of the thyristor switch and a blocking gene. Each positive pulse through the rator, the input of which is connected to the common diode 16, charges in series the connecting point of the first diode and the second condensed capacitors 14 and 17 - the torus, and the output through the inputted separator is selected on the basis of the proportional diode connected to the control one. The voltage Ui on the capacitor by the electrode of a thyristor switch, while 17 is increased stepwise by the amount of the blocking generator contains a single junction (Fig. 3) and is determined by a formula transistor whose emitter is Ui7 gtly (where n is the number of positive blocking generator, divider eg - pulses). When Ui reaches a threshold with an adjustable resistor connected between the common point of the rectifying diode and the output terminal and the second base of the unijunction transistor, the first capacitor 17 is. Thus, the base of which through the other resistor is strictly synchronized with the divider. voltage is connected to the common the output, in addition, the capacitor connected between the second base of the unijunction transistor and the cathode of the thyristor switch. value, then the unijunction transistor 8 is triggered. And the triggering occurs at the time of the voltage jump the time of the incoming half-wave network voltage. Due to the fact that the response threshold of the unijunction transistor 8 depends on the voltage across its second base, the division factor of the frequency divider can be adjusted by a resistor 10, which is made controlled. When a single junction transistor 8 is triggered, a fast discharge of the capacitor 17 occurs, the single junction transistor 8 opens and voltage pulses are removed from the resistor 11 through the separation diode 13, opening the thyristor switch 4. In this case, the pulse current 3 (Fig. 3) close to form to the half-wave of the mains voltage with a frequency equal to the division factor set by the resistor 10. Invention Formula An adjustable AC voltage converter containing a thyristor switch connected between the input and output pins connected to the input terminals and a series rectifier and a magnitude converter 14-16 5; 6th 18 .15 ± 17 Ж А FIG. 2 FIG.