SU1628164A1 - Single-cycle voltage converter - Google Patents

Abstract

This invention relates to electrical engineering and can be used in secondary power supply sources. The purpose of the invention is to increase the reliability of the device by simplifying it and improving the quality of regulation by increasing the steepness of the adjustment characteristic. The converter contains a regulating transistor 3, a power transformer 4 with the first 5, second 6 primary windings and secondary windings 10.1, 10.2, first 7 and second 8 capacitors, diode 9 and output circuit (11, 12, 13), with elements 6, 7, 8 and 9 form a link. The inclusion of a link or several links in series between the end of the primary winding 5 and the collector of the regulating transistor 3 provides an increase in the reliability of the device by simplifying it, since only one regulating element is used, as well as an increase in the steepness of the regulating characteristic. 1 hp ff, 1 ill. L- 1 (L S o y 00 o

Description

The invention relates to electrical engineering and can be used in sources of secondary power supply of electronic equipment.

The purpose of the invention is to increase the reliability of the device by simplifying it and improving the quality of regulation by increasing the steepness of the adjustment characteristic.

The drawing shows a circuit of a single-phase voltage converter.

The device contains positive 1 and negative 2 power supply terminals, regulating transistor 3, power transformer 4, first 5 and second 6 primary windings, first 7 and second 8 storage capacitors, diode 9, secondary windings 10.1 and 10.2 of a power transformer, rectifying diodes 11 , smoothing LC filter 12, load 13, links 14.1 -14.N and choke 15.

In addition, between the end of the first primary winding 5 and the collector of the regulating transistor 3 can be connected in series several of these links 14.1 - 14.N.

The device in the established mode works as follows.

At the stage of switching on the regulating key 3 with a relative duration y, the first storage capacitor 7 is discharged through the second primary winding 6 and the control switch 3. This also discharges the second storage capacitor 8 by the current of the first primary winding 5 and the energy is transferred to the load from secondary half-winding 10.1 through rectifier 11 and a smoothing filter 12. Diode 9 at this time interval is under blocking voltage. In the off state of the regulating switch 3 with a relative duration (1 - y), the first storage capacitor 7 is charged through the diode 9 with the current of the first primary winding 5 and charged with the second storage capacitor 8 through the diode 9 with the current of the second primary winding 6, as well as transmission energy into the load 13 from the secondary semi-winding 10.2 through the rectifier 11 and the smoothing filter 12. Assuming the ideality of all the elements, the continuity of the flux change in the magnetic elements and the disregard of the voltage pulsations The following ratios were obtained for the circuit elements in steps y and (1 - y) from the equality of the volt-second areas to the capacitors compared with their average values:

Ud E (1-y) / 1- (N + 1) y; Uc2 Ey / 1 - (N + 1) y; (1 -y) (m + n2) / 1 - (N + 1) y; where E is the voltage of the power source;

UC1, Uc2 - voltage at ground 7 and

the second 8 storage capacitors, respectively;

y is the fill factor of the pulse duration;

0 N - the number of cells;

DH is the load voltage 13; ni, P2 - the number of turns of secondary semi-windings 10.1 and 10.2 and turns of the first primary winding 5, respectively.

5 A partially amplitude-modulated voltage acts at the input of the smoothing filter, at the interval at its value is UC1 ni, and at the interval (1 - y) - Uc2 П2. If you choose a relationship

0щ / П2 у / 1 - у

at a nominal value of y, then the indicated voltage values are the same, while

11n Е (1 -y) m / 1 - (N + 1) y

5 and there is no need to install a filter 12.

At the same windings of the first and second (N-th) primary windings, the same voltage is applied at intervals y and (1 - y).

By changing the coupling coefficient between the first and second (Nth) primary windings, the current ripple in the first primary winding can be reduced to almost zero. From this it follows that the current consumed from the primary source is continuous with a very small ripple value, i.e. The proposed device possesses increased reliability and ensures simplification of the converter with continuous current consumption. The required value of the coupling coefficient can be ensured by switching on in series with the primary winding 5 throttles 15.

5With constant values of UH, E, the steepness of the regulating characteristic increases with growth of N. Thus, the proposed device provides an increase in the steepness of the regulating characteristic.

Claims (2)

1. Single-ended voltage converter containing a control transistor, a power transformer with two primary windings, the first of which is connected to the positive input terminal, and the second through the first capacitor connected to the emitter of the control transistor with a negative 0 five A second input capacitor, a second capacitor, a diode and the secondary windings of a power transformer, which are connected via a rectifier and filter to the terminals for connecting the load, characterized in that, in order to increase the reliability of the device by simplifying it and improving the quality of regulation, by increasing the steepness of the control characteristic, the second primary winding, a diode and two capacitors form a link in which the anode of the diode with the negative plate of the second capacitor connected to it form the first output of the link, the cathode 0 the diode is connected to the connection point of the beginning of the winding and the first capacitor, and the end of the winding with the positive capacitor of the second capacitor connected to it forms the second output of the link, and the link with its first and second leads is connected between the end of the first primary winding and the collector circuit of the regulating transistor. 2. The converter according to claim 1, of which there are two, with the fact that at least one additional, similar to the specified link, is connected in series to the collector circuit of the control transistor.