SU1686660A1 - Ac to dc voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and, in particular, to low voltage direct current power supply devices. The purpose of the invention is to reduce the size and weight of the converter and increase safety. The converter consists of two parts interconnected by an electronic key 2, with the first part being made according to the circuit of the capacitive converter, and the second one - the high-frequency one. With the help of a capacitive converter 1, the voltage is only partially reduced, which creates conditions for use in a high-frequency converter, which operates at a lower input voltage, transistors with reduced operating voltages. In connection with the increase in voltage at the output of the first part, the capacitance of the capacitors and, accordingly, the mass and dimensions are significantly reduced. 1 il.

Description

UNION OF THE SOVIET SOCIALIST REPUBLIC „„ SIU 1686660 A1 (51) 5 n 02 M 7/10 ________________________________

STATE COMMITTEE ON INVENTIONS AND OPENINGS

AT SCST USSR

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

(21) 4615165/07 (22) 02.12.88 (46) 10.23.91. Bull. No. 39 (71) Khmelnitsky Technological Institute of Consumer Services (72) A. M. Davydov and Yu. G. Winter (53) 621.314.5 (088.8) (56) USSR Copyright Certificate No. 720634, cl. H 02 H 3/06, 1984.

USSR copyright certificate No. 1275704, cl. H 02 M 7/10, 1984.

(54) AC VOLTAGE CONVERTER TO CONSTANT (57) The invention relates to electrical engineering and, in particular, to power supply devices with low-voltage direct voltage. The purpose of the invention is to reduce the size and weight of the Converter and increase security. The converter consists of two parts interconnected by an electronic key 2, and the first part is made according to the capacitive converter, and the second high-frequency. Using a capacitive converter 1, the voltage is only partially reduced, which creates the conditions for the use of transistors with reduced operating voltages in a high-frequency converter operating at a reduced input voltage. Due to the increase in voltage at the output of the first part, the capacitance of the capacitors and, accordingly, the mass and dimensions are significantly reduced. 1 ill.

IV 0999891

The invention relates to "electrical engineering, in particular to power supply devices with low-voltage direct voltage.

The purpose of the invention is the reduction of dimensions and mass and increased safety.

The drawing shows a schematic diagram of a converter.

The converter contains capacitive converters 1 connected to the network through diodes in such a way that one capacitive converter stores the energy of the positive half-wave of the mains voltage, and the other of the negative half-wave. Electronic switches 2 are connected to the output of capacitive converters 1 through transistors 3 and their shunt resistances 4. High-frequency transistor converter 5 is connected to one input with free outputs of capacitive converters! and the other input has free leads of electronic keys 2. The outputs of the high-frequency converter 5 are connected to the primary winding of the high-frequency transformer 6, the secondary winding of which is connected to the AC inputs of the bridge rectifier 7. A load is connected to the DC outputs of the bridge rectifier 7. The control circuit 8 is connected to the control terminals of the electronic keys 2 and the bases of transistors 3.

The converter operates as follows.

Capacitive converters 1 simultaneously with the rectification of the current partially reduce the voltage (about 3-10 times from the desired conversion coefficient). Switching transistors 3 is carried out at zero values of the mains voltage. Moreover, when the electronic switch 2 is closed, the vast majority of the voltage due to the presence of the resistor 4 is applied only to the electronic switch (thyristor) 2, which allows the use of low-voltage transistors in the switches. At the same time, the accidental opening of the electronic key 2 during the passage of the interference signal is impossible, since the transistor 3 is closed. The resulting low-voltage direct current is converted in the high-frequency converter 5 to high-frequency alternating current. However, in view of the fact that the voltage at the input of this converter stage is much lower than the mains voltage, it seems possible to construct it on the basis of low voltage transistors. Using a high-frequency transformer 6, the high-frequency alternating current voltage is reduced to the nominal output of the entire transformer, and the bridge rectifier 7 converts the alternating current into direct current. Control circuits 8 are designed to form control pulses.

The combined use of capacitive and high-frequency transducers connected by a thyristor-transistor key can reduce the capacitance of the capacitors and eliminate the isolation keys, reduce the cost due to the possibility of using non-deficient low-voltage transistors, both in the connection key and in the high-frequency converter.

Claims (1)

Claim AC voltage to DC converter containing two capacitive converters, two inputs of each of which are connected to the terminals of opposite electrodes are connected to one of two pairs of diodes, the free output of the power electrode of each diode of one pair is connected to the free output of the power electrode of the opposite polarity of the other pair, and the common the connection points of these diodes form the input pins for connecting the power supply network, as well as two electronic keys with control circuits, characterized in that dimensioning and mass and increasing safety, one of the outputs of each capacitive converter is connected to the corresponding electronic key through additionally inputted pa · ^ parallel-connected transistor and resistor, and other outputs of capacitive converters connected to one of the inputs of the additionally introduced high-frequency transistor converter, to another input which are connected to the free outputs of electronic switches, the output of the high-frequency transistor converter is connected to the primary winding further inputted high-frequency transformer, the secondary winding is connected to an input of further inputted bridge rectifier, whose output forms the output terminals to the load connection, wherein the base of each of the transistors is connected to a corresponding output of the control circuit of the electronic key.