SU993475A1 - Device for changing current direction - Google Patents

Description

The invention relates to a 1-pulse technique and can be used to change the direction of the direct current in the load circuit.

A transistor device for changing the direction of the current in the load circuit is known, which contains two output transistors of different conductivity type and a control circuit consisting of Two transistors PT.P "P type and two transistors -" pg type. Depending on the polarity of the control voltage, the transistors of the corresponding conductivity type open and the output voltage polarity is ensured on the output bus.

The disadvantages of the known device are the difficulty of controlling the change in current direction in the consumer, since the device contains a complex, four transistor, control circuit for output transistors and requires the use of a symmetrical control source of 9 waves; increased power consumption from the source of the control signal, since two transistors (the first n-pin and the second pnp or the first p. and the second pp-rlp transistors) are opened directly by this source.

The closest in technical essence to the present invention is a device comprising first and second transistors p-.p "n-type and third and fourth transistors p-gpgr-type, the bases of which through resistive10 capacitive circuits are connected to the first terminal of the control voltage source , the second terminal of which is connected to the common bus. The emitters of the second and fourth transistors are connected to the common bus and the first load terminal connected by the second output to the collectors of the first and third transistors. The emitter of the first transistor is connected to the collector of the fourth transistor and the negative terminal of the input source, the positive side of which is connected to the collector of the second and the emitter of the third transistor.

25 In this device, depending on the polarity of the control voltage, either the p-p-p type transistors or the ns-p-nnTHna transistors open, ensuring that the current is directed in the load C2.

The drawbacks of the device are the control complexity and the increased power required from the control source. signals, due to the fact that the control signal is fed to the bases of all four transistors, and also because the potential of the emitters of the first and third transistors depends on the device state of the potential of the base of the second and fourth transistors, and the magnitude of the control signal must: provide the necessary values of the potentials of the bases of both pairs of transistors ..

The purpose of the invention is to increase the reliability of the device and increase the efficiency.

The goal is achieved by the fact that the device for changing the direction of the current, containing the first and second transistors p-p n-type, the third and fourth transistors p-a-i-p-type and the first and second resistors connected to the first output, respectively the bases of the first and third transistors, the collectors of which are combined and connected to the common bus and the emitters of the second and fourth transistors through the load, the fourth collector and the emitter of the first transistor are connected to the negative bus of the input source, positive The bus of which is connected to the collector of the second and the emitter of the third transistor, the second terminals of the first and second resistors are connected to the common bus, and the bases of the second and fourth transistors are connected to the first terminal of the source, control signals, the second terminal of which is connected to the common bus.

The drawing shows the basic electrical circuit device

The device contains the first transistor 1 ps1p "pg - type, connected to the base with a common bus through the first resistor 2, the third transistor 3 p-p-type connected to the base,. With a common bus through the second resistor 4, the second transistor 5. Type. and the fourth transistor 6.tipa, the base of which is connected to the base. The transistor 5 and the first terminal 7 of the control signal source connected by the second terminal to the common bus 8, the emitter of transistor 1 is connected to the collector of transistor 6 and negative, the bus 9 of the input source, and the emitter of transistor 3 and the collector. transistor 5 - to the positive bus iO, the collectors of transistors 1 and 3 are connected to the first load terminal -and connected by the second output to the emitters of the transistors 5 and b.i. common bus. .

The device works as follows.

When a negative potential is applied from the source of the control signal to terminal 7 with respect to the common bus 8 TBC from this source, the transistor b is opened and, through the open transition of the collector-emitter of transistor 6, the emitter of transistor 1 connects to the common bus, the potential of its emitter approaches zero and the transistor closes. Negative bus 9. The source of the input signal through the open transistor b is connected to the common bus and the second output of the load 11.

At the same time, the negative control signal closes the transistor, which ensures the emitter potential of transistor 3 is approximately equal to the potential of the input source. Transistor 3 is opened by the base current; - flowing through the circuit: base of transistor 3, resistor 4, bus, open collector-emitter junction of transistor 6, bus 9., input source, bus 10, emitter of transistor 3, i.e. . current from the input source. Through the open transition of the collector: torus-emitter of the transistor 3, the positive bus 10 of the input source is connected to the first output terminal 11. When a positive potential is applied to the terminal 7 of the positive potential terminal 7, the transistors 5 and 1 are opened and the transistors b and 3 are closed, as a result, a negative bus 9 is connected to the first load output, and a positive input source bus 10, the second output, is connected to the second output.

Thus, when the control signal is changed to the opposite polarity, the direction of the current in the load changes accordingly. Due to the fact that transistors 5 and 6 are controlled by a current from a control signal source, and transistors 1 and 3 are controlled by a current from an input signal source, the proposed device has the following advantages compared with the known ones: The signal is supplied to the bases of only two transistors and its value should satisfy only one requirement - obtaining the necessary base potential of transistor 5 (b); the power consumption from the source of control signals is half as much as at any time it is spent on opening only one transistor 5 or b.

Claims (2)

1. For Germany FRI 2416534, cl. H 03 K 17/66, published., 1977V 2. US Patent 3175100 Cl. 307-88.5, published. 1969. F