SU1444923A1 - A.c. voltage converter - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is the expansion of functional capabilities. Change the state of the contactors of the switching element 18 on the output pins. 16, 17, it is possible to obtain a constant or alternating voltage. The change in the voltage on the diode is carried out by changing the phase of the control pulses generated by the driver control pulses made on capacitors 2.5, diodes 3.6 and control resistor 4. A reversing switch consisting of diodes 27.28 and three positions Contactor 23 provide voltage reverse at load 15 and change its value twice, for. what is achieved is a goal. 2 Il.

Description

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The invention relates to electrical engineering.

The purpose of the invention is the expansion of functionality.

In Fig. 1, a schematic diagram of a converter is provided; FIG. 2 shows stress diagrams for a load in various modes of operation.

The converter contains a control pulse shaper 1, which consists of a capacitor 2, shunted by a diode 3, which is connected by a cathode to a regulating resistor 4, capacitance 5, capacitor 5, shunted by diode 6, threshold elements 7 and 8, connected 1 { to the control electrodes of thyristors 9 and 10, respectively, whose cathodes and input of driver 1 are connected directly to input terminals 11 and 12, diodes 13 and 14, load 15 connected to outputs 16 and 17, switching element 18 containing two two-position switches with contacts 19 , 20 and 21, 22, three-position switch 23, containing contacts 24 - 26, as well as diodes. 27 and 28. The outputs 29 of the control resistor 4 are connected to the outputs 30 of the output of the driver 1, to which the anode of the threshold element 7 is connected, and the output 31 of the driver 1, which is connected to another output of the regulating resistor 4, is connected

with the cathode of the diode 27s the anode of the diode 28 and through the contact 24 of the three-position switch 23 with the output 32 of the output of the control driver 1 to which the anode of the threshold element 8 is connected. The anode of the diode 27 is connected to contact 25, and the cathode 28 to contact 26. At This three-way switch 23 and the diodes 27 and 28 form a reversing switch.

The device works as follows.

When the AC load 15 is connected to the terminals 16 and 17 by the switching element 18, the contacts 19 and 21 are closed and the contacts 20 and 22 are opened, and the switching element 23 is closed the contact 24. When applied to the input terminals 11 and 12, the AC voltage 33 (see figure 2) in the positive half-cycle in the circuit: diode 3 -. control resistor 4 - contact 24 - capacitor 5, the capacitor 5 is charged. When the voltage on it reaches the threshold of the threshold element 8, the thyristor 10 opens and a current flows through the circuit along the load 15: diode 13 - contact 19 - load 15 - contact 21 - thyristor 10. Condenser 2 at this time is shunted by diode 3. In the negative half-period of the input voltage, capacitor 2 is similarly charged, thyristor 9 opens and along the circuit: diode 14 - load 15 - thyristor 9, current flows

in the opposite direction. The capacitor 5 in this case is shunted by a diode 6. In this case, the load is subjected to a voltage of 34 (see). When connected to the output outputs 16 and 17 of the load 15 of the direct current by the first switching element

18, the contacts 19 and 2 are closed at Ta. 20 and 22, and the second switching element 23 closes the contact 24. In this case, the thyristor 10 opens in the terminal half-period of the input voltage and the current flows through the circuit: diode 13 contact 22 is the load 15 contact 20 - thyristor 10.

In the negative half-period of the input voltage, the thyristor 9 opens and along the circuit: diode 14 - load 15 - thyristor 9, current 15 flows through the load of the same direction, Kaic and

the previous half-period (SM, POS. 35 in figure 2).

When connected to the output terminals 16 and 17 of the reverse load 15 DC (for example,

or the excitation windings of the low-power electric motor), the first switching element 18 closes the contacts

19 and 21 and the contacts 20 and 22 are opened, and the second switching element

23 The contact 26 is closed. When applying to the input terminals 11 and 12 of the alternating voltage in the positive half-cycle the circuit: diode 3 - register 4 - diode 28 - contact 26, the terminal is charged

capacitor 5 opens thyristor 10

and along the circuit: diode 13 - contact 19 - load 15 - contact 21 - thyristor 10, the current flows in the forward direction. In the negative half-period of the input voltage, the diode 28 closes and the current through the load 15 does not flow (see item 36 in Fig. 2).

With the required reverse polarity, the voltage at the terminals 16 and 17 is the second

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the switching element 23 closes the contact 25. When an alternating voltage is applied to the input outputs 11 and 12 in the negative half-period of the input voltage across the circuit: diode 6 - contact 25 - diode 27 - regulating resistor 4, the capacitor 2 is charged and opens : diode 14 - load 15 - thyristor 9, the current through the load 15 flows in the opposite direction. In the positive half-period of the input voltage, the diode 27 is closed and the current through the load 15 does not flow (see pos. 37 in Fig. 2).

The regulating resistor 4 can change the charging time of the capacitors 2 and 5 and thereby change the unlocking angle of the thyristors 9 and 10. In this case, the value of the alternating or constant voltage on the load will vary.

Claims (1)

Invention Formula the control resistor are the outputs of the control pulse shaper, each of which is connected via a threshold element to the control electrode of the corresponding thyristor, the switching element consists of two two-position switches, the movable contacts of which are connected to the anode of the thyristor of the first power unit and the cathode of the second power diode the node, respectively, and with the corresponding output pins, the fixed contacts of the first two-position switch are connected to the cathode of the first-power diode The second node and the anode of the thyristor of the second power node, and the fixed contacts of the second two-position switch, with the cathode of the diode of the first power node and the anode of the thyristor of the second power node, characterized in that, in order to expand the functionality, an AC reverse transducer is inserted; included between the control resistor are the outputs of the control pulse shaper, each of which is connected to the control electrode of the corresponding thyristor through the threshold element, the switching element consists of two two-position switches, the moving contacts of which are connected to the thyristor anode of the first power node and the cathode of the diode of the second power node respectively, and with the corresponding output pins, the fixed contacts of the first two-position switch are connected to the cathode of the first-force diode th node and the anode of the second thyristor power unit and the fixed contacts of the second on-off switch - with the cathode of the diode to the first power node and the anode of the second thyristor power unit, characterized in that, in order to expand functionality introduced reversion containing two strong nodes, each of which consists of a diode and a thyristor, while the diode anode and thyristor cathode are connected and connected to the corresponding input terminal, the control pulse driver containing the first capacitor, the regulating resistor and the second one in series between the input terminals a capacitor, each capacitor being shunted by a diode, an anode connected to the input terminal, a single point of capacitors and do one of the capacitors and a regulating resistor and contains two diodes and a three-position contactor, with one output of the reversing the switch is a moving contact of a three-way contactor, and the other output is one of the fixed contacts with the anode of one diode and the cathode of another connected to it diode, opposite pins of the reversing switch diodes are connected to other fixed contacts of the three-position contactor. dd d 56 .fVJ 37 V Fie.2 ar