RU2815071C1 - Wide-range constant voltage regulator - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to constant voltage regulators, and can be used in secondary power supply systems for control and stabilization of constant output voltage. Device comprises power control switch (1), two linear inductors (2, 3) connected in series through capacitor (4). First inductor (2) by the first pole is connected to the positive output of the input DC voltage source, and by the other pole through control switch (1) to the negative output of the input DC voltage source, which forms a common bus. Second linear inductor (3) is connected by the first pole to capacitor (4), and by the second pole — to output voltage generating capacitor (5) with load (6) connected in parallel, which second pole is connected to common bus. Device includes second power control switch (7), connected by one pole to positive terminal of input constant voltage source, and the second pole is connected to the common point of connection of capacitor (4) and second linear inductor (3).

EFFECT: formation of wide range of output voltage variation from positive to negative value.

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Description

The invention relates to electrical engineering, in particular, to constant voltage regulators and can be used in secondary power supply systems to regulate and stabilize constant output voltage.

There are known constant voltage regulators with two linear inductances connected in series through a capacitor [1].

A disadvantage of the known constant voltage regulators with series-connected linear inductances through a capacitor is the inability to generate an output voltage that varies from positive to negative values.

The closest in technical essence to the proposed device is a constant voltage regulator with two linear inductances connected in series through a capacitor [1].

The disadvantage of this constant voltage regulator is that it cannot regulate the output voltage from positive to negative.

The purpose of the invention is the formation of a wide range of output voltage changes from positive to negative values.

This goal is achieved by introducing a second power control switch into the device, connected with one pole to the positive terminal of the input DC voltage source, and the second pole to the common connection point of the capacitor and the second linear inductance.

In fig. 1, 2 and 3 show schematic electrical diagrams of embodiments of the proposed wide-range constant voltage regulator.

In fig. Figure 1 shows a schematic electrical diagram of the proposed wide-range constant voltage regulator.

In it (Fig. 1) a power regulating switch 1, two linear inductances 2, 3, connected in series through a capacitor 4, the first inductance 2 is connected with the first pole to the positive terminal of the input constant voltage source, and with the other pole through the regulating switch 1 to the negative terminal of the input a constant voltage source forming a common bus. The second linear inductance 3 is connected with the first pole to the capacitor 4, and the second pole to the capacitor 5 generating the output voltage with a parallel-connected load 6, the second pole of which is connected to the common bus. A second power control switch 7 is introduced into the device with one pole connected to the positive terminal of the input DC voltage source, and the second pole connected to the common connection point of the capacitor 4 and the second linear inductance 3.

In fig. Figure 2 shows a schematic electrical diagram of the proposed wide-range constant voltage regulator, in which two linear inductances connected in series through a capacitor are combined on a common magnetic circuit in the form of two windings connected counter-currently, forming a magnetically coupled magnetic element.

In fig. Figure 3 shows a schematic electrical diagram of the proposed wide-range constant voltage regulator, in which linear inductance 8 is connected in series with the second winding of the magnetic element.

We will consider the principle of operation of the proposed wide-range constant voltage regulator based on the assumption of the ideality of the key elements, steady-state operating mode and continuity of change in the magnetic flux in the core of the magnetic element.

Let us denote by D the duration of the on state of key 1 relative to period T.

When the switch 1 is closed during the time DT , the voltage on the capacitor 4 equal to V _IN D/(1-D) with the negative pole is applied through the switched-on key 1 to the input of the L-shaped LC filter, composed of inductance 3 and output capacitance 5 with a parallel connection load 6. Simultaneously with switching off key 1, key 7 is switched on, which is in a conducting state for time (1-D)T . During this time, a positive voltage V _IN equal to the source of constant input voltage acts at the input of the same L-shaped LC filter. Thus, during the period T , a multipolar voltage acts at the input of the L-shaped LC filter, which generates an output voltage equal to V _IN (1-2D)/(1-D). It follows that when D < 0.5 the output voltage is positive, when D = 0.5 it is zero, and when D > 0.5 it is negative.

The use of a magnetic element (Fig. 2), replacing two linear inductances in the form of one magnetically coupled circuit, consisting of two back-to-back windings separated by a capacitor, makes it possible to simplify the magnetic elements in a wide-range constant voltage regulator and provide a condition for increasing the differential inductance of the windings of the magnetic element. If the number of turns of the magnetically coupled windings of the magnetic element is equal, connecting linear inductance 8 in series with the second winding connected to the output capacitor (Fig. 3) makes it possible to eliminate current pulsations in this winding and, as a consequence, to eliminate output voltage ripples.

Thus, the proposed wide-range constant voltage regulator, in comparison with the known device, makes it possible to regulate the output voltage from positive to negative values while maintaining all the advantages of the known device.

Information sources

1. Polikarpov A.G., Sergienko E.F. Single-cycle converters in power supply devices REA, “Radio and Communications”, 1989, p. 51, fig. 2.6., page 54, fig. 2.8.

Claims (3)

1. A wide-range constant voltage regulator containing two linear inductances connected in series through a capacitor, in which the first linear inductance is connected with the first pole to the positive terminal of the input constant voltage source, and the other pole through the regulating switch to the negative terminal of the input constant voltage source, forming a common bus, the second linear inductance is connected with the first pole to the capacitor, the second pole is connected to the output capacitor generating the output voltage with a parallel-connected load, the second pole of which is connected to the common bus, and the power switch is connected to the common point of connection of the second pole of the first inductance with the capacitor, the second pole connected to common bus, characterized in that a second power switch is introduced into the wide-range constant voltage regulator, one pole connected to the positive terminal of the input constant voltage source, and the second pole connected to the common point of connection of the second linear inductance with the capacitor. 2. A wide-range constant voltage regulator according to claim 1, characterized in that two linear inductances connected in series through a capacitor are combined on a common magnetic circuit in the form of two windings connected counter-currently, forming a magnetically coupled magnetic element. 3. Wide-range constant voltage regulator according to claim 2, characterized in that a linear inductance is connected in series with the second winding of the magnetically coupled magnetic element.