SU1737664A1 - Regulated single-cycle voltage converter - Google Patents

Abstract

Use: sources of secondary power supply. SUMMARY OF THE INVENTION: The converter contains two double-optic inductors 1, 2, transistors 3, 4, rectifying diodes 7, 8. The capacitive filter is made of two series-connected capacitors 5, 6, diodes 7, 8 are connected in series and parallel to the capacitors. Between the points of connection of the capacitors and the diodes are connected in series the secondary windings of the chokes. The magnetizing currents of the chokes change in antiphase, which causes the continuity of the input current consumption and the output voltage ripple. 2 s

Description

The invention relates to electrical engineering and can be used in secondary power sources for converting a constant voltage level.

The aim of the invention is to enhance the functionality of a converter by allowing the output voltage to be controlled while reducing the ripple of the current consumed and the output voltage.

FIG. 1 is a functional diagram of an adjustable single-ended voltage converter; in fig. 2 - time diagrams of his work.

The single-ended DC-DC converter contains two double-wound throttles 1 and 2, the primary windings of which through the corresponding control transistors 3 and 4, controlled counter-phase, are connected to the input terminals of the converter, and the output windings through two corresponding rectifying diodes 7 and 8 s in zany with a bone filter. The rectifying diodes 7 and 8 are connected in series and connected in parallel to the load circuit 9 connected in parallel to a capacitive filter consisting of two series-connected capacitors 5 and 6, and the extreme points of the connected in series and to the connection points of the diodes 7 and 8 and capacitors 5 and 6 according to the output windings of chokes 1 and 2.

The constant voltage single-ended converter in the steady state mode works as follows.

To the control electrodes of transistors 3 and 4, antiphase latitude-modulated pulses are applied (Fig. 2a, b). In the conducting state of the transistor (interval 0 - y T), the induced emf is induced on the secondary winding of the throttle 1, equal to the recalculated voltage of the power source, the unlocking diode 8 and the locking diode 7. A voltage across the secondary windings of 2 is applied to the voltage difference across the capacitor b the secondary winding of the throttles 1, under the action of which the magnetizing current of the throttles 2 decreases (Fig. 2e). Under the action of the power supply voltage, the magnetizing current of the chokes 1 increases (dashed line in Fig. 2d), and through the transistor 3 the sum of the magnetizing currents of chokes 1 and 2 (solid line in Fig. 2c) closes. The capacitor 5 is discharged by the load current (Fig. 2e), and the capacitor 6 is charged by the difference in currents of the secondary winding of the choke 2 and the load 9 (Fig. 2g). Through the diode 8, the magnetizing current of the chokes 2 is closed (the solid line in Fig. 2e),

and a blocking voltage is applied to diode 7. In the time interval T – T, when transistor 4 is open, diode 7 is opened, the magnetizing current is passed

Drossel 1 (Fig. 2d), and the diode 8 is locked by a voltage of load 9; A voltage supply is applied to the primary winding of Drossel 2, under the action of which the magnetisation current of Drossel 2 increases

(the dotted line in Fig. 2d), and the magnetization current of the droplets 1 decreases (Fig. 2d) under the action of the difference in the voltage of the capacitor 5 and the secondary winding of the choke 2. The sum of the currents flows through transistor 4

magnetizing chokes 1 and 2 (dotted line in FIG. 2 c). The capacitor b is discharged by the load current (Fig. 2g), and the difference between the magnetization currents of the Drossel 1 and the load 9 (Fig. 2e) flows through the capacitor 5.

From the balance of volt-second areas on the windings of chokes, you can get the expression for the regulating characteristic of the converter U En / (1-y) y,

where E is the voltage of the power source; U Us + Ue is the load voltage; n m P2 - transformation ratios of double-winding chokes 1 and 2;

y is the fill factor of the control pulses.

Analysis of this expression shows that the load voltage can be adjusted over a wide range, reaching a minimum at y 0.5.

Since the current consumed from the power source is the sum of the anti-phase varying magnetizing currents, the ripple of the input current is reduced.

In addition, since the discharge of one of the capacitors of the capacitive filter corresponds to a continuous charge of the other capacitor on the switching interval and vice versa, and the load is connected to the series-connected filter capacitors, pulsations and output voltages are reduced.

Claims (1)

Claims of the Invention Adjustable Single-ended voltage converter containing two double-winding chokes, the primary windings of which are connected to the input terminals of the converter through appropriate regulating transistors controlled by an antiphase, and the output windings through two corresponding rectifying diodes associated with a capacitive filter differing from that, in order to expand the functionality of the converter by allowing the output voltage to be controlled while reducing the ripple of the current consumed and the output voltage, rectifying diodes are connected in series and connected in parallel a load connected in parallel to a capacitive filter consisting of two series-connected capacitors, and to the junctions of the diodes and capacitors are connected the outermost leads connected in series and according to