SU628525A1

SU628525A1 - Contactless on-route

Info

Publication number: SU628525A1
Application number: SU742033467A
Authority: SU
Inventors: Иван Дмитриевич Савелов; Давыд Исакович Коваленчик
Original assignee: Предприятие П/Я А-7755
Priority date: 1974-06-10
Filing date: 1974-06-10
Publication date: 1978-10-15

Description

Изобретение относитс к области автоматизации производственных процессов, в частности, может быть использовано в системах автоматизации дл контрол положени передвижных механизмов.The invention relates to the field of automation of production processes, in particular, can be used in automation systems for monitoring the position of mobile mechanisms.

Известны бесконтактные переключатели , содержащие трансформаторный датчик, трансформатор, вторична обмотка которого соединена с входом триггера Шмидта и общей шиной источника питани , причем питание триггера Шмидта осуществл етс от отдельного источника питани .Non-contact switches are known that contain a transformer sensor, a transformer, the secondary winding of which is connected to the Schmidt trigger input and a common power supply bus, and the Schmidt trigger is powered from a separate power supply.

Однако такой бесконтактный переключатель обладает низкой стабильностью порога срабатывани при изменении температуры окружающей среды.However, such a proximity switch has a low threshold stability when the ambient temperature changes.

Дл повышени стабильности в подобных устройствах используют высокостабильные пороговые элементы, что значительно усложн ет устройство и тем самым уменьшает его коэффициент надежности l.In order to increase stability in such devices, highly stable threshold elements are used, which considerably complicates the device and thereby reduces its safety factor l.

Наиболее близким к изобретению по технической сущности вл етс бесконтактный путевой переключатель, содержащий трансформатор с сердечником, одну первичную и две вторичные обмотки, выпр митель и триггер Шмвдта, причем одна из вторичных обмоток трансформатора подключена между входом триггера Шмидта и его ойдей шиной, а сердечник трансформатора выполнен подвижным 2.The closest to the invention to the technical nature is a contactless track switch comprising a core transformer, one primary and two secondary windings, a rectifier and a Schmvdt trigger, one of the secondary windings of the transformer being connected between the Schmidt trigger input and its bus, and the transformer core made movable 2.

Недостатком этого бесконтактного пе- рзключател также вл етс низка стабилыюсть порога срабатывани при изменении температуры окрунсаюшей среды.The disadvantage of this non-contact switch is also the low stability of the response threshold when the temperature of the surrounding medium changes.

Это объ сн етс тем, что напр жение питани на триггер Шмидта подаетс от отдельного источника питани , не завис щего от температуры трансформатора, что приводит к нес шфазной зависимости тока смещени триггера, тока обратной св зи и тока от трансформатора на входе триггера .This is due to the fact that the supply voltage to the Schmidt trigger is supplied from a separate power source, independent of the transformer temperature, which causes a phase dependence of the trigger bias current, the feedback current and the current from the transformer at the trigger input.

Целью изобретени вл етс повышение стабильности порога срабатывани при изменении температуры окружающей среды.The aim of the invention is to increase the stability of the response threshold when the ambient temperature changes.

Claims

This is achieved by the fact that, in the proposed switch of the other, the secondary winding of the transformer is connected via a rectifier to the power supply buses of the Schmidt trigger, and the single1 {secondary terminals of the secondary windings are connected to each other and to the common W1SHOY. The drawing shows a diagram of the described path switch. A proximity switch contains a transformer 1 with one primary L and two secondary L2 and L windings, rectifier 2 and Schmidt trigger 3 on transistors T, and one of the secondary windings La of transformer 1 is connected to the input of Schm1stcht trigger 3 Other secondary winding U transformer Matora 1 is connected via rectifier 2 to the Schmidt trigger trigger power supply unit 3. The secondary terminals of the same name are connected to each other and to the common busbar. The uncontrolled travel switch works as follows. When the primary winding, transformer 1 is connected to power supply Uj, the voltage induced in winding L and rectified by rectifier 2 supplies the collector circuits and the bias circuit of Schmidt trigger 3. At this bias current 3 through the resistor T opens the transistor Tj and the current the signal winding circuit of the sensors in the rear is closed. If vicMv0i, then transistor Tl is open, and transistor Tp is closed. When the voltage induced in the winding Lj TOKJg increases, and when D Vdg OA 1 the transistor T closes and the transistor T opens. The transient effect of the transient process is provided by the positive feedback realized in the trigger via the resistor Ri. Since the transistor T is open, the current 3 is almost zero. Therefore, when Toica 3g decreases, the reverse switching will occur if OdCM Uchichgoga’s condition is 6,254 that, as the transformer temperature changes, the voltage on the winding U 2 of transformer 1 and the winding LS of transformer 1 will change, and consequently also the current. , t) g ,, C) (3, trigger switches will occur under almost the same conditions. Thus, the operation of the proposed contactless directional switch is almost independent of the sensor temperature, which will allow using simple and reliable thresholds x elements increase the reliability of the switch operation. Invention non-contact switch containing a transformer with a core, one primary and two secondary windings, a rectifier and a Schmidt trigger, one of the secondary windings of the transformer connected between the Schmidt trigger input and its common bus, and the core transformer is made movable, which is characterized by the fact that, in order to increase the stability of the response threshold when the ambient temperature changes, another secondary winding transforms Attorney is connected via a rectifier to the power supply of the Schmidt trigger, the secondary terminals of the same name are connected to each other and to the common busbar. Sources of information taken into account in the examination; 1. Sensors of the operating mode of the type DR-1, DR-2 (Technical Passport) D 59.0OO.PS, 14.02.74.

2. Author's Certificate of the USSR No. 159889, cl. Q 08 C 19 / O6, 1965.

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