RU2551806C1 - Transformer technique for transistor control - Google Patents

Abstract

FIELD: physics, control.

SUBSTANCE: invention relates to transistor control and can be used in automation, telemechanics and robotics. A transformer technique for controlling a transistor is characterised by that the output controlled power circuit of the transistor is galvanically decoupled at the base with the low-ampere control circuit by transformer coupling of the secondary coil of the transformer, which may or may not have a core, wherein the control circuit has a catcher as the primary coil of the transformer, which may have a power supply independent of the controlled circuit.

EFFECT: providing reliable isolation between a control circuit and a controlled circuit.

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Description

A known method of controlling a transistor by supplying a signal to a base or gate to amplify or convert signals. The disadvantage of this method is that galvanic coupling is used, which in an emergency turns the transistor into a junction point of all its electrodes, in which the control and controlled circuits are mixed. The control circuits, as a rule, are low-voltage, and the controlled circuits are usually high-voltage. Mixing these circuits leads to disastrous consequences for control circuits.

This drawback can be corrected by applying a transformer at the basic input of the controlled transistor, which has reliable isolation between the control and the controlled circuit. For this purpose, a kacher should be used (RF Patent No. 2444124 “Generator of electric circuit breaks - a transistor-driven kachet” by V. Brovin) to excite the transformer primary winding, and connect the secondary winding to the base (gate) of the controlled transistor.

The kacher allows you to periodically connect and disconnect the electric circuit in each separate time interval, allowing you to act within the limits of the events in which the action of the EMF of self-induction is manifested, without going into stationary mode.

The author assumes that the occurrence of current from a voltage source in the circuit is accompanied by a mechanical rotation of the magnetic moments of the atoms surrounding the inductance of the substance along the conductor in which the current flows, and the energy of the circuit's power source is expended on this (The phenomenon of transferring inductance energy through the magnetic moments of the substance in the surrounding space , and its application. - M .: MetaSintez, 2003 - 20 p. ISBN 5-901569-05-9; author V. Brovin) An open circuit is accompanied by a mechanical return of magnetic moments to the initial position, and this creates an impulse of self-induction, to which the current does not correspond in time.

Mechanically rotating magnetic moments act on the secondary winding of the transformer as a moving conductor with current and create an energy source in it that can control the base-emitter current of a controlled power collector-emitter circuit.

Figure 1: a transistor controlled by a square-wave generator generates a current I in the inductance, which is the primary winding of a transformer without a core (the presence of a core is possible, but not necessary). It unlocks the transistor in the base, which creates a voltage drop U on the resistor, in the secondary circuit only in the initial (during current rise) and final stages (when the current flow is interrupted, which corresponds to the return of magnetic moments to the initial state).

During the action of the stationary state, the transformation does not occur, because the magnetic moments are held stationary by the power source of the transistor cascade and do not affect the secondary winding of the transformer, as happened with increasing current and returning to the original state.

To create, in this case, the current in the secondary winding of a transformer without a core, a significant power supply is required in the primary winding circuit. For this reason, the use of transformer coupled control with a sinusoidal or other form of control signal is impractical, even in the presence of a core.

If you replace the primary coil with a quality inductor coil, and supply the quality circuit from a source of lower power, then a controlled transistor will open from the secondary winding of such a transformer for the entire time interval of switching on the quality power (see figure 2). True, in the opened interval, nanosecond locking intervals will appear during the action of the self-induction pulse that occurs when the quality chain breaks, but they are easily smoothed, if necessary, by a shunt capacitance. Power quality requires much less power than in the previous case.

This method of controlling the transistor will allow you to create powerful new automation tools in automation, telemechanics, robotics.

At the same time, this method of energy transfer allows you to power local independent circuits and create contactless connectors with the transfer of energy and information through individual transformer communication lines.

Claims (1)

A transformer method for controlling a transistor, characterized in that the output (power) controlled circuit of the transistor is galvanically isolated from the base with a control (low-current) circuit by transformer coupling, the secondary winding of the transformer, which may or may not contain a core, while the control circuit has a cacher as a primary winding transformer, which may have a power supply independent of the controlled circuit.

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