SU1636965A1 - Ac-to-dc voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used as a power source. The purpose of the invention is to increase the effective operation and simplify the device. The device allows to reduce the power loss at transistors 13 and 16 and to reduce the output voltage decrease with increasing load current by increasing the residence time of transistors 13 and 16 in the closed state. This is ensured by charging the filter capacitor 7 from the middle terminal of the secondary winding of the transformer 1, as well as by charging the capacitor 8 of the base circuit of the transistor 13 from the middle terminal of the specified winding. For a more significant reduction in power at the transistors, the voltage in the load from the storage capacitor 6 is transmitted through a choke 14 connected to the collector circuit of the transistor 16 along with the diode 17. 2 CI f-ly, 1 ill. with SS (L

Description

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the output of the secondary winding of the transformer 25 bp above the energy left for the charge is connected to the anodes of the decoupling diodes 10 and 11. The cathode of the diode 0 is connected to one of the fixed contacts of the resistor 12 of variable resistance, to the base of the transistor 13 and to the positive side of the capacitor :eight. The cathode of diode 11 is connected to a moving contact of a resistor 12, another fixed contact of which is connected to a positive terminal of a capacitor 7, one of the winding pins of droplets 14, an emitter of a transistor 13 and a positive output terminal 15. A collector of transistor 13 is connected to the base of a reverse transistor 16 of conductivity type with respect to transistor 13. The collector of transistor 16 is connected to the free terminal of the winding droplets 14, and through the reverse diode 17 to the negative output terminal 9 The emitter of transistor 16 is connected to positive This leads to the fixed terminal of the capacitor 6. In this case, the moving contact of the resistor 12 can be combined with a fixed contact of the resistor connected to the output terminal 15, and to be able to connect an additional load to the double voltage, there is an additional output terminal 18 to which through the decoupling diode 19 the emitter of the transistor 16, and between the output pins 9 and 18 is additionally included a capacitor 20.

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filter capacitor for the same part of the period when the voltage on the transformer is less than on the capacitor. This allows an increase in the minimum output voltage level at high load currents. At low currents, when the storage capacitor does not have time to discharge to a voltage close to the voltage of the filtering capacitor, it is possible to reduce the time of the closed state of the transistors. In this case, the jumper on the resistor 12 (shown by the dotted line) is eliminated. In order to increase the time of the closed state of the transistors at high load currents, it is necessary to connect diode 11 to capacitor 7, and diode 10 to resistor 12

To obtain additional double voltage, an additional capacitor 20 can be switched on, which is charged through diode 19. It is also possible to charge capacitor 20 through an additional two diodes from the output terminals of the transformer :.

Claims (1)

Invention Formula :one. A device for converting an alternating voltage into a constant containing transformer, the primary winding of which is connected to the input terminals for connecting a source more energy is left for charge filter capacitor for the same part of the period when the voltage on the transformer is less than on the capacitor. This allows the minimum level of the output voltage to be increased at high load currents. At low currents, when the storage capacitor does not have time to discharge to a voltage close to the voltage of the filtering capacitor, it is possible to reduce the time of the closed state of the transistors. In this case, the jumper on the resistor 12 (shown by the dotted line) is excluded. In order to increase the closed state of the transistors at high load currents, it is necessary to connect diode 11 to capacitor 7, and diode 10 to resistor 12 To obtain additional double voltage, an additional capacitor 20 can be switched on, which is charged through diode 19. It is also possible to charge capacitor 20 through an additional two diodes from the output terminals of the transformer :. Invention Formula :one. A device for converting an alternating voltage into a constant voltage, comprising a transformer, the primary winding of which is connected to the input terminals for connecting power supply, and the secondary winding is made with an average output, a rectifier of four diodes, the first and second transistors, a choke, the first and second capacitors, the negative terminals of which are connected to the negative output terminal for connecting the load, the positive terminal of the first capacitor is connected to the output the first transistor, with one of the leads of the throttle winding, and with a positive output terminal for connecting the load, and the positive terminal of the second capacitor is connected to the output of the second transistor, different in order to increase efficiency and simplification, the transistors have opposite types of conductivity and additionally introduced two decoupling and one reverse diode, a three-pole variable resistor and a third capacitor, the negative terminal of which is connected to the negative output terminal, and the positive one is connected to the output of the control electrode of the first transistor, the cathode of the first isolating diode and the first fixed contact of the resistor, the output of the moving contact of which is connected to Odom second decoupling diode, and the second fixed contact is connected to to the positive output terminal, the rectifier diodes are connected by a bridge circuit, the output diagonal of which is connected to the corresponding like terminals of the second capacitor, and the input diagonal is connected to the extreme leads of the secondary winding of the transformer, the average output connected to the anodes of the decoupling diodes, and the output of the first transistor is connected to the output of the control electrode of the second transistor, the output of which is connected to its 5 a baud terminal of the winding of the throttles and a cathode of the decoupling diode, the anode connected to the negative output terminal. 2 The device according to claim 1, about t l and - with the fact that the conclusions of the movable and second fixed contacts of the resistor are interconnected .3 The device according to claim 1, characterized in that a third decoupling diode and a third capacitor are additionally introduced, the negative terminal of which is connected to the negative output terminal, and 0 its positive forms an additional output output and is connected to the cathode of the third decoupling diode, the anode connected to the positive terminal of the second capacitor 0 five