SU754400A1 - Stabilized bipolar voltage source - Google Patents

Description

The invention relates to electronics and can be used in analog-digital electronic circuits as a unified secondary source of direct current. five

Known stabilized sources of bipolar voltage, connected to primary sources of alternating current (1] and £ 2].

The drawbacks of the sources are 'θ in that they require a primary source of alternating voltage, which is absent in many autonomous systems, a power transformer is required, which complicates their design, a pair of output voltage regulators is required, which leads to the need to develop stabilizers and reduces the unification of products, since a number of serially produced stabilizers of only one type of conductivity.

Closest to the present invention is a stabilized bipolar voltage source containing 25 two keys connected in series, the free power terminal of one of which is connected to one of the input

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Of these, it is connected to the second input and common output pins, and the free electrode of the other is connected to one of the plates of the filter capacitor, the other plate of which is connected to the free power terminal of the other switch, and the connection point of the filter capacitor to the diode is connected to one of the output pins. storage capacitor connected between the points of connection of keys and diodes [3].

The disadvantages of this device are the lack of symmetry of the output voltage of a bipolar voltage due to the loss of the initial stabilized voltage in the circuits when switching them, as well as the presence of a noticeable magnitude of the ripple voltage of the additional (switching) output.

When replacing a primary voltage stabilizer with two secondary voltage stabilizers, it becomes necessary to install a complementary pair of voltage stabilizers, which requires the development of an additional voltage regulator with respect to serially

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loss of time, and often quality.

The purpose of the invention is to ensure the symmetry of the output voltage, with simultaneous unification.

This goal is achieved by the fact that two identical constant voltage regulators are introduced into a stabilized source of bipolar voltage, one of which is connected between the input terminal connected to the key and one of the output terminals, and the second between the point of connection of the key with the filter plate a capacitor and a common terminal of the first dc voltage regulator connected to a common terminal of the source, the common terminal of the second dc voltage regulator being connected to the second output terminal and Točník.

Functional diagram of the stabilized bipolar voltage source is shown in the drawing.

 The stabilized source contains serially connected switches 1 and 2, a filter capacitor 3 and diodes 4 and 5, a storage capacitor 6 connected between the points of connection of the keys and diodes, a constant voltage regulator 7 whose input is connected to a positive input terminal and a key 1, an output with a positive the output pin, and the common pin - with a negative input and common output pins, and the identical stabilizer 8 DC voltage, the input of which is connected to the positive plate of the filter capacitor 3, the output d - a common output terminal, and the total output - with the negative plate of filter capacitor 3 and a negative output terminal.

The device works as follows.

In the half-cycle of the control signal, when the key 1 is closed and the key 2 is open, the storage capacitor 6 is charged with current flowing from the positive input terminal through the key 1, the capacitor 6 and the diode 5 to the negative input terminal.

In the next half-cycle of the control signal, switch 2 is closed, and switch 1 is open, capacitor b is discharged through switch 2, capacitor 3 and diode 4, and its discharge current ensures the charge of capacitor 3, the voltage of which in the steady state is close to the primary voltage (minus voltage drops on the keys and diodes), and its sign corresponds to the sign of the polarity indicated on the drawing for capacitor 3. Since the voltage on the capacitor 3 is isolated from the input

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of the pins (at the moments of charge of the capacitor 6 is decoupled by an open key 2 and a reverse-biased diode 4, and at the moments of discharge of the capacitor 6 - an open key 1 and a back-biased diode 5), then unified (commercially available) voltage regulators, providing the necessary symmetry of the ra-pole output voltages and a small level of output pulsations.

The device can also be used to obtain decoupled stabilized sources (without combining the output of the stabilizer 8 with the common output).

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Claims (1)

Claim A stabilized bipolar voltage source containing two series-connected keys, a free power terminal of one of which is connected to one of the input terminals, two series-connected diodes, a free electrode of one of which is connected to the second input and common output terminals, and a free electrode of the other one from the plates of the filter capacitor, the other plate of which is connected to the free power terminal of another switch, and the connection point of the filter capacitor with the diode is connected to one of the output pins, and a storage capacitor connected between the points of connection of the keys and the diodes, characterized in that, in order to ensure the symmetry of the output voltages with simultaneous unification, two identical constant-voltage regulators are introduced into it, one of which is connected between the input terminal connected with the key, and one of the output pins, and the second between the point of connection of the key with the lining of the filtering capacitor and the common output of the first dc voltage regulator connected to the common in vodom source, wherein the common terminal of the second DC voltage stabilizer is connected to the second output terminal of the source.