SU374673A1 - NON-CONTACT TIME RELAY - Google Patents

Description

The invention relates to automation elements.

Contactless time relays are known, made on the basis of a bridge circuit consisting of a resistive-capacitive time of the master circuit and a resistive voltage divider connected between the poles of the power source, and the diagonal of which includes the equivalent of a two-base diode on transistors of different conductivity types containing an output amplifier stage executive relay as a load.

To obtain a stable on state of the executive relay without self-blocking in known time relays, an intermediate link on a key memory element is required, for example, a trigger required to eliminate relaxation oscillations in the circuit.

The aim of the invention is to simplify the known beta-1 time relays by eliminating the intermediate link on the key element while ensuring a stable on state of the executive relay without self-blocking.

This is achieved by the fact that between the collector of a pnp-ra: ncn1stora and the base of a pn-transistor of the equivalent of a two-base diode a diode is inserted in the direct connection, and the base and collector of the pn-th transistor of the output

the amplifier is connected via resistors respectively to the collector and the pnp transistor equivalent base of a two-base diode, forming a trigger circuit. :

The drawing shows a schematic diagram of the proposed device.

The device contains a four-shoulder bridge circuit formed by resistors /,

2, 3 and capacitor 4, with the two adjacent arms of the bridge circuit, resistor 3 and capacitor 4 forming the time of the master circuit, and the resistors / and .2 are the voltage divider of the power supply, the diagonal of which includes the equivalent of a two-base diode on transistors 5 and 6, and the output amplifier on - p - «- transistor 7 with a junior relay 8 IB motherhood K1olle1kt.or.noi nagrue.yui.

Between collector p-l- / 7 transistor

5 and a base of a pnp transistor 6 connected to a common connection point of resistors / and 2 of a resistive voltage divider, a diode 9 is introduced in forward switching on, i.e. an anode to the collector of a pnp transistor 6

The base -p- / g-transistor 7 of the output amplifier through a resistor, 10 is connected to the collector of the pp- / g-transistor 5 equivalent of a two-base diode, and the base of the transistor 5 through the resistor 11 to the collector of the transistor 7.

The scheme works as follows. When the supply voltage is applied, the capacitor 4 begins to charge through the resistor 3. Upon reaching the voltage on the capacitor 4, equal to the voltage on the divider, transistors 5 and 5 are opened from resistors 1 and 2, and the capacitor 4 is discharged. When the transistor 5 is opened, the voltage is applied to the base of the transistor 7 through the resistor 10. The latter opens, applying voltage to the load and the base of the transistor 5 through the resistor. After the capacitor 4 is discharged, the transistors 5, b, and 7 are in the open state. Diode 9 serves to remove the voltage divider (resistors Y and 2) from the base of the transistor 7. Thus, the executive relay 8 will be in the on state before the voltage is removed.

Subject invention

A contactless time relay containing a four-arm bridge circuit consisting of a capacitive-capacitance time of the master circuit and a resistive voltage divider connected between the poles of the power source, the diagonal of which includes the equivalent of a two-base diode on transistors of different conductivity types such that the emitter is n-p- A transistor connected by a base to the pnp-TpaiH3 iCTopa collector and to the connection point of the resistor of the voltage divider is connected to the connection point of the capacitor and resistor of the drive circuit, and the output amplifier on a p-l transistor connected in a circuit with a common emitter, with an executive relay as a collector load, characterized in that, in order to obtain a stable on state of the executive relay without self-blocking and simplify the device, between the collector p-p- a transistor and a pn-p-transistor base equivalent to a two-base diode, a diode is inserted in direct connection, and the base and collector are n

The p-g transistor of the output amplifier is connected via resistors respectively to a collector and a pp-p-transistor base equivalent to a two-base diode, forming a trigger circuit.

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