SU898568A1 - Reversible dc converter - Google Patents

Description

Union of Soviet

Socialist

Republics

DESCRIPTION

INVENTIONS <11) 898568

TO AUTHOR'S CERTIFICATE (61) Additional to author. Svnd-vu (22) 3Approved 25.12.79 (21) 2857574 / 24-07 with the application L (51) M. Kl!

H 02 And 3/335

State Committee

USSR for Inventions and Discoveries (23) Priority Published on January 15 ,.82. Bulletin L 2.

Date of publication of the description 15.01.82 (53) UDC 621.314.

.58 (088.8) (72) The inventors

G.M. Rumyantsev and Ya.G. Donskoy (71) Applicant

State Special Design Thermophysical Instrumentation (54) REVERSE DC CONVERTER

The invention is intended for reversing current in active and inductive loads and can be used, for example, for reversing current in a thermoelectric battery or electric motor. ⁵

Known devices designed to reverse current in active and inductive loads [ ¹ ] and E 2 J However, they do not completely solve the issue of eliminating the through currents that occur when switching transistors of these converters.

The most effective method of eliminating the through currents caused by the absorption processes in previously saturated transistors is the introduction of time delays for unlocking the turning on transistors. A characteristic feature of the scheme fl], _m is an active sealing of the transistors when overcurrent amplifier transistors.

In the device [2], an automatic delay of turning on of the output transistor for the time of absorption of the other output transistor is performed due to shunting of the input circuit of the control transistor of this arm.

The closest to the proposed technical essence is a reversible DC-DC converter having a bridge, thyristors are included in two adjacent arms, transistors and a bridge of oncoming diodes connected in parallel to the thyristors and blocking transistors in two other arms. The device has protection against through current when a control signal is applied to both inputs, for which blocking transistors are used, bypassing the control transitions of the bridge transistors, and the base of the blocking transistors are connected to the control electrodes of thyristors £ 3].

However, this device is characterized by insufficient reliability with a hard supply voltage.

898568 4

The aim of the invention is to increase the reliability of protection of the reversing Converter from through currents when you turn on the circuit or at the same time supply control signals to 5 all inputs.

This goal is achieved by the fact that in the reversible DC-DC converter, made according to the bridge circuit, containing thyristors in the first 10 first two adjacent arms, and bipolar transistors in the other two, the control transitions of which with a bias diode connected in series are shunted by the power target 15 of the key controlled element, one of the diagonals of the bridge circuit connected to the output terminals and the other to the input, introduced a second bias diode and DC 20 amplifiers made on transistors differently conductivity with galvanic collector-base connections, the input of each of the amplifiers is connected: · to the bias diode, respectively, and output 25 to the control electrode of a key controlled element made in the form of a thyristor.

The drawing shows a diagram of a reversible DC-to-current converter.

The converter contains bridge transistors 1 and 1, thyristors 2 and 2, control diodes 3 and 3 ', a DC amplifier on transistors of various types of conductivity, including transistors 4 and 5, diode 6, resistors 7-U,' capacitor 11 .

The structure of the circuit also includes a thyristor 12, connected in parallel with the bridge transistor, the negative feedback resistance 13 of the transistor 1st load resistance 14.

Protection against through currents is as follows. ₄₅

When transistor 1 of thyristor 2 is simultaneously unlocked (when a larger input voltage is applied), current flows through transistor 1 and diode 3. The voltage on diode 3 is the control voltage for the two-stage DC amplifier on transistors 4 and 5 "The collector current of transistor 5 opens thyristor 12, which shunts the base-emitter junction of transistor 1. Transistor 1 closes, the through current is turned off, and thyristor 2 is turned off. The right half of the circuit works similarly.

The proposed reversible DC-DC converter compares favorably with the known one, since the reliability of the thyristor-thyristor bridge protection from through currents is increased when switching on or while supplying control signals to all inputs.

Claims (3)

(5) REVERSIBLE CONSTANT TRANSFORMER The invention is intended to reverse current in active and inductive loads and can be used, for example, to reverse current in a thermoelectric battery or electric motor. There are devices known to reverse current in active and inductive loads 1 and However, they are not completely The problem of eliminating the through currents arising from the switching transistors of these converters is solved. The most effective method for eliminating through currents caused by resorption processes in previously saturated transistors is the introduction of time delays for unlocking the switching transistors. A characteristic feature of the f1 circuit is the active locking of the transistors during current overload of the amplifier transistors. Device 2 automatically delays the turn-off of the output current of the output transistor by absorbing another output transistor by shunting the input control transistor of this shoulder. The closest to the proposed technical entity is a reversible DC converter that has a bridge, the two adjacent arms of which include thyristors, the other two - transistors and a bridge of oncoming diodes connected in parallel to the thyristors, and blocking transistors. The device has a through-current protection when a control signal is applied to both inputs, for which blocking transistors are used, shunting the control transitions of bridge transistors, and the bases of blocking transistors are connected to the control electrodes of the thyristors of the GB. However, this device is characterized by insufficient reliability when the supply voltage is 388. The aim of the invention is to increase the reliability of protection of the reverse converter against through currents when the circuit is turned on or simultaneous control signals are applied to all inputs. The goal is achieved by the reverse current converter made on the bridge circuit, containing thyristors in the first two adjacent shoulders, and in the other two bipolar transistors, which control transitions from after In addition, the bias-connected diode is shunted by the power target of the key controlled element, one of the diagonals of the bridge circuit is connected to the output pins, and the other to the input, a second bias diode and DC amplifiers are installed, made on transistors of different conductivity with galvanic collector base connection, the input of each of the amplifiers is connected: to the bias diode, respectively, and the output - to the control electrode of a key controlled element made in the form of a thyristor A reverse current converter circuit is introduced. The converter contains bridge transistors 1 and 1, thyristors 2 and 2, control diodes 3 and 3 a DC amplifier on transistors of different conductivity types, including transistors and 5, diode 6, resistors 7 10, capacitor 11. V The circuit also includes a thyristor 12 connected in parallel with the bridge transistor, the resistance of the negative feedback 13 of the transistor 1 and the load resistance 1. The protection against through currents is as follows. When transistor 1 and thyristor 2 are unlocked simultaneously (when a higher input voltage is applied) current is flowing through transistor 1 and diode 3. The voltage on diode 3 is controlling for two-stage amplifier of constant current at transistors A and 5 Collector current of transistor 5 opens the thyristor 12, which shunts the base-emitter transition of the transistor 1. Transistor 1 closes, turns off the through current and turns off the thyristor 2. The right half of the "Proposed reversing DC / DC converter works the same way differs from the known one, since the reliability of protection of the transistor-thyristor bridge against the through currents is increased when it is turned on or when simultaneous control signals are applied to all inputs. Claims An inverse DC converter made according to a bridge circuit contains thyristors in two adjacent arms, and in two other bipolar transistors, whose control transitions with a series-connected bias diode are shunted by the power circuit of the key controlled element, one of the bridge diagonals the circuit is connected to the output pins, and the other to the input pins, characterized in that, in order to increase reliability, a second bias diode and DC amplifiers are introduced into it, Transistors of different types of conductivity with collector-base connections, the input of each of which is connected to the bias diode, respectively, and the output to the control electrode of a key controlled element made in the form of a thyristor. Sources of information taken into account in the examination of 1t ETvA. Ed. Yu.N.Koneva, .Soviet Radio, 1972, pp.51-53, 2. ETVA. Ed. Yu.N.Koneva, No. 6, M., Soviet Radio, 197 p. 107. 3. USSR author's certificate 85530, y. H 02 M 3/135, 1973.