SU586512A1

SU586512A1 - Time relay

Info

Publication number: SU586512A1
Application number: SU752197027A
Authority: SU
Inventors: Виктор Ефимович Чернохлебов
Original assignee: Предприятие П/Я Г-4847
Priority date: 1975-12-12
Filing date: 1975-12-12
Publication date: 1977-12-30

Description

(54) РЕЛЕ ВРЕМЕНИ(54) TIME RELAY

II

Изобретение относитс к области электротехники и радиотехники, в частности может быть использовано в аппаратуре электроподвижного состава.The invention relates to the field of electrical engineering and radio engineering, in particular, can be used in the equipment of an electric rolling stock.

Известны реле времени, содержащие врем задающую КС-цепь, пороговый элемент, релаксационный генератор, нереключающий элемент 1.Known time relay, containing the time specifies the KS circuit, the threshold element, a relaxation generator, non-switching element 1.

Недостатком указанных реле вл етс низка помехоустойчивость, ввиду того, что пороговый элемент ничем не защищен от воздействи помех и в любой момент, особенно при нанр жении на конденсаторе близком к опорному , может сработать. Это влечет за собой необходимость применени дополнительных мер по обеспечению требуемого уровн помехоустойчивости (экранирование, пассивные и активные фильтры).The disadvantage of these relays is low noise immunity, since the threshold element is not protected from the effects of interference and at any moment, especially when applied to a capacitor close to the reference one, can work. This entails the need to apply additional measures to ensure the required level of noise immunity (shielding, passive and active filters).

С целью повышени помехоустойчивости в устройстве, содержащем врем задающую RC-цепь, выход которой подключен ко входу порогового элемента на двухбазовом диоде, одна из баз которого соединена через резистор с шиной источника питани , релаксационный генератор, переключающий элемент, включенный в контур разр да врем задающего конденсатора, предлагаетс вторую базу двухбазового диода соединить с другой шиной источника питани через ключевой элемент релаксационного генератора, выполненного в виде блокинг-генератора.In order to improve noise immunity in a device containing an RC driver circuit, the output of which is connected to the input of a threshold element on a two-base diode, one of the bases of which is connected via a resistor to the power supply bus, a relaxation generator, a switching element included in the discharge circuit the capacitor, it is proposed to connect the second base of the two-base diode to another power supply bus through a key element of the relaxation generator, made in the form of a blocking generator.

На фиг. 1 нредставлена принципиальна схема устройства; на фиг. 2 - диаграмма напр жений , по сн юща принцип работы.FIG. 1 is a schematic diagram of the device; in fig. 2 is a voltage chart illustrating the principle of operation.

Устройство содержит врем задающую цепь, состо щую из резистора 1, конденсатора 2, пороговый элемент на двухбазовом диоде 3, либо на его эквиваленте, резистор 4, релаксационный генератор в виде блокинг-генератора 5 на ключевом элементе 6, конденсаторе 7 и трансформаторе 8, переключающий элемент 9, выполненный в виде трансформатора.The device contains a master circuit consisting of a resistor 1, a capacitor 2, a threshold element on a two-base diode 3 or its equivalent, a resistor 4, a relaxation generator in the form of a blocking generator 5 on a key element 6, a capacitor 7 and a transformer 8 that switches element 9, made in the form of a transformer.

Устройство работает следующим образом.The device works as follows.

Claims

When the power is applied, it starts to generate a blocking generator 5 and the time is set to drive the capacitor 2 through a resistor 1. As a result of the operation of the blocking generator based on 6i of the two-base diode 3, voltage L / g will be present, the shape of which is shown in FIG. 2. This voltage is characterized by the fact that the potential of the base periodically decreases briefly to almost zero. This voltage drop is possible only during the blocking process, when the key element 6 (transistor) opens to saturation and the base 6i is connected to the negative power supply bus. Since this time interval is negligible compared to the whole period f, to base 6i is connected to the positive power supply bus through the winding of the pulse transformer 8, almost constantly. During the time period i, when the base 6i is connected to the positive power supply bus, the switching of the two-base diode 3 is completely excluded and no interference can cause it. The operation of a two-base diode can occur only with the simultaneous existence of the following two conditions. 1. The voltage on the capacitor 2 (t / c2) must reach the switching voltage f / n of the two-base diode, or exceed it. f / n is determined from the expression Un U ,, where T is the internal voltage ratio of the two-base diode; igg is the voltage between bases 6i and 6z when the base b is connected to the minus power supply bus.

2. The transistor is on the rise, which can only be during the blocking process. These conditions correspond to the time period tz, during which reliable switching of two-base diode 3 and discharge of capacitor 2 to the output pulse transformer 9 occurs. Formula of the invention Time relay containing an RC driving circuit, the output of which is connected to the input of the threshold element on a two-base diode One of the bases of which is connected via a resistor to the power supply bus, a relaxation generator, a switching element included in the discharge circuit, a master capacitor time, characterized in that Accelerating noise immunity, the second base two-base diode is connected to another power source bus via a key element of the relaxation oscillator constructed as a blocking oscillator. Sources of information taken into account in the examination 1. US Patent No. 3593185, cl. 331-46, publ. 1971.

t

-t +

P

0-.

u1l

I

-fi FIG. I

ig. g