SU1499475A1 - Magnetic-transistor gate - Google Patents

Abstract

The invention relates to a pulse technique and can be used in control systems. The purpose of the invention is to increase efficiency and reduce size. The magnetically-transistor switch contains a power transistor 4, a current transformer 6, a matching transformer 12 and two switches on transistors 8 and 9. The introduction of a winding 16 of a current transformer 6, a diode 10 and a resistor 17 prevents the current transformer 6 from magnetizing in operation. 1 il.

Description

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WITH

 sd

31499

The invention relates to a pulse technique and can be used in control systems.

The aim of the invention is to increase efficiency and reduce size.

The drawing shows a circuit diagram of a magneto-transistor switch.

The magnetically-transistor switch contains the power supply buses 1 and 2, which through the load 3 and the power transistor 4 are connected to the primary winding 5 of the current transformer 6, the secondary winding 7 of which is connected to the emitters of the transistors 8 and 9 and the common bus an auxiliary power source (+ E), and the second through the first diode 10 - with the average output of the primary winding 11 of the matching transformer 12 and through the first resistor 13 and diode 14 - to the bus of the auxiliary power source (+ E). The secondary winding of the transformer 12 is connected to the base-emitter junction of the power transistor 4. The base of the transistor 8 is connected to the control voltage source (U CR) of the input control bus, and the base of the transistor 9 is connected via the limiting second resistor 15 to the collector of the transistor 8. Winding 16 transformer 6 current one output connected to the collector of the transistor 9, and the second through the third resistor 17 - to the bus auxiliary power source (+ E).

Magnetic transistor key works as follows.

When control voltage Ucr is present at the input of transistor 9, for example, in the form of a logical 1 signal, transistor 9 opens, through it magnetizing current of transformer 12 passes through the circuit: potential power supply bus + E, resistor 13, first diode 14, transformer winding 11 12, the transistor 9, the common bus and the magnetizing current of the current transformer 6 along the circuit: a potential bus of the power source + E, a resistor 17,. winding 16 of the transformer 6, the transistor 9, the common bus. The transistor B is then closed, and a negative voltage is applied at the base of the power transistor 4, which keeps it in the locked state.

The removal of the control voltage from the input of the transistor 9, for example, on the left

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the signal of the logical O leads to its locking, which ensures the open state of the transistor 8. The energy accumulated in the inductance of the winding 11 of the transformer 12 during the flow of magnetizing current, when the transistor 9 is locked, is transformed into the secondary winding and navo-; It is driven at the base of the power transistor 4 by a positive voltage with which it is opened. At the same time, a current begins to flow through the transistor, which through the winding 5 of the transformer 6 induces a voltage on the secondary winding 7, through the diode 10 arriving at the middle winding pin .11 of the transformer: torus 12 and maintaining a positive potential at the base of transistor 4 during the open state nor transistor 8.

The transformation ratio of the transformer 6 is selected in such a way that the voltage on the winding 7 exceeds the voltage of the auxiliary power source (+ E). The diode 14 is then locked, the current from the power source (+ E) in this circuit is not consumed. The next occurrence of the signal logic 1 at the input of transistor 9 leads to its opening and locking of transistor 8. The polarity of the voltage on the secondary winding of transformer 12 is reversed, which causes the appearance of negative potential on the basis of transformer 4.

The forced locking of the transistor 4 occurs, and the amount of carrier resorption in the base is proportional to the collector current of the transistor. After the resorption of the carriers, the transistor 4 is locked, the voltage on the winding 7 of the current transformer 6 becomes zero, and the negative voltage is further maintained on the base of the power transistor 4 due to the current flowing through the winding 11 of the transformer 12 from the auxiliary power source E. The diode 10 at the same time prevents the magnetization of the core of the current transformer 6 by the voltage on the middle lead of the winding 11 of the transformer 12. Further operation of the device is similar.

Claims (1)

Invention Formula A magnetically-transistor switch containing a power transistor, a trans current transformer, the primary winding of which is connected in series to the emitter-collector circuit of the power load transistor and power supply buses, two keys on transistors whose emitters are connected to the common auxiliary voltage source bus and the first the output of the secondary winding of the current transformer, the matching transformer, the extreme terminals of the primary winding of which are connected to the collectors of the transistors of the keys, the average output through sequentially Connections first diode and the first resistor - to a potential schine auxiliary power source vshody secondary winding of the matching transformer soedine0 five 0 With the emitter-base circuit of the power transistor, the base circuit of the transistor of the first key is connected to the input control bus, the base of the transistor of the second key is connected via a second resistor to the collector of the transistor of the first key, characterized in that, in order to improve efficiency and reduce size, additionally introduced a second diode, a third resistor, and a third winding in the current transformer - a third winding, with the first output of the third winding of the current transformer connected to the collector of the first key transistor, the second output through the third resistor - to the potential bus of the auxiliary power source, and the second output of the secondary winding of the current transformer through the third diode is connected to the middle output of the additional transformer.