SU907391A1 - Transformer static switch-over - Google Patents

Description

one

The invention relates to an autocontrol, in particular, to non-contact switches for positional control of the position of mechanisms and can be used in control systems or automatic control of technological processes.

A contactless trans is known (a 5-terminal switch containing a differential transformer converter made on two trans (1 inspectors, the primary windings of which are connected according to a serial circuit, the terminals of which are connected to an alternating current source, and the secondary windings are connected to a serial circuit, the outputs of which are connected to two output circuits). busbar, and the amplifier transistor 1.

However, the known device is not very accurate.

The closest technical solution is a contactless transformer switch containing a differential transformer converter made on two transformers, the primary windings of which are connected according to a series circuit, the leads are connected to the corresponding output buses, the main amplifier on the transistor, the resistor and diode 2.

However, the resolution of the known device is insufficient, so

As a shunting feedback action is carried out only in one half-period of the supply voltage, which can lead to possible error, due to the excess of the frequency of situations changing over the resolution of the switch over the full period.

The purpose of the invention is to improve accuracy.

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Claims (2)

The goal is achieved by the fact that a contactless transformer switch7 contains a differential-transformer converter, a driver made on two transformers, the primary windings of which are connected according to a series circuit, the terminals of which are connected to the corresponding output buses, a main amplifier at a transistor, a resistor and a diode, an additional amplifier on the transistor, a resistor and a diode are introduced, the base of the transistor of the main amplifier being connected to the first output bus, through an additional A diode with the first bus of the AC source and through an additional resistor with the emitter of the additional transistor amplifier, the base of which is connected to the second output bus, is connected via a diode to the combined terminals of the transformer primary windings and through a resistor with the emitter of the transistor of the main amplifier whose collector is connected to the first bus AC source, and the collector collector of the additional amplifier. is connected with the combined leads of the transformer primary windings. The drawing shows a circuit diagram of the proposed device. The contactless transformer switch contains a diode 1, two resistors 2 and 3, a transistor k, and a differential transformer transformer, the reelectric winding of which is made in the form of two successively connected windings 5 and 6, working and compensating, connected to source 7 AC, the output of the converter, made in the form of two signal windings B and E, is connected via resistor 2 to the input of an amplifying element, for example, a transistor. In addition, there are additional diode 10 and an amplifier on the transistor 11. Until the controlled object with ferromagnetic properties appears, the working winding 5 due to the equality of the emf induced in the windings 8, 9 does not have an output signal and the transistors 4 and 1 are locked at the input. The appearance of ferromagnetite mass It eliminates the interconnection between the winding 5 and the winding 8. As a result, a difference signal 1 of a small amplitude appears at the output of the oppositely connected windings 8, 9. In this situation, in the first, positive half-period of the supply voltage from the source 7s, when a voltage is applied to the collector-emitter junction of the transistor C through the diode 1 and the resistor 2 in the conductive direction for this junction, the difference signal opens the basic emitter junction of this transistor k. The collector-emitter junction of the transistor shunts winding 6, thereby increasing the imbalance of the secondary EMF of the windings 8.9. The process is an avalanche, and the amplitude of the output signal almost reaches the value of the supply voltage. In the next negative half-period of the supply voltage, a similar process of shunting the winding 6 through the diode 10 and the resistor 3 is performed by the collector-emitter junction of the transistor 11, whose input is open to this half-period. In this way, relaxation oscillations occur in both half-periods of the supply voltage, due to which the resolution of the device increases at least 2 times, which increases the accuracy of the device. A non-contact transformer switch comprising a differential transformer converter, made on two transformers, the primary windings of which are connected according to a series circuit, the terminals of which are connected to corresponding output buses, a main amplifier on a transistor, a resistor and a diode. To improve the accuracy, an additional amplifier on a transistor, a resistor and a cable are introduced, the base of the transistor of the main amplifier being connected to the first output bus, through an additional diode - with the first bus of the AC source and through an additional resistor - with the emitter of the additional amplifier transistor, the base of which is connected to the second output bus, through the diode connected to the combined terminals of the primary windings of the transformers and through the resistor emitter of the main amplifier the collector of which is connected to the first; bus of the source of alternating current, and the collector of the transistor of the additional amplifier is connected to the combined terminals of the primary windings tr neformatorov. 9073916 Sources of information taken into account in the examination 1. USSR author's certificate L 602780, cl. G 01 O 5/22, 197. 5 2. USSR author's certificate W, cl. G 01 D 5/22, 1973 (prototype).