JPH0527792Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Use The present invention relates to a time delay relay circuit of the delay operation type used in railway signal safety devices and the like.

BACKGROUND ART FIG. 2 shows a conventional delay operation type time element relay circuit. When DC power is applied between terminals 1 and 2, the second relay 2R operates first. Then, the first relay 1R is connected through the operating contact _2R1 .
operates and is self-held by contact _1R1 .

On the other hand, the capacitor in the gate pulse generation circuit 3
C ₁ starts charging at the same time as the DC power is turned on,
After a certain period of time, when the charging voltage becomes higher than the blocking voltage of the single junction transistor (UJT) 4, the charged charge of the capacitor _C1 is instantly discharged between the base and emitter, and the gate pulse is generated as a gate pulse of the thyristor (SCR) 5. It is applied to the gate and makes the thyristor 5 conductive.

When the thyristor 5 is conductive, the second relay 2R
Both ends of the switch are shorted and restored, and the restoration contact 2R ₂
The AND condition of the output circuit consisting of the series connection of the first relay's operating contact _1R2 and the first relay's operating contact 1R3 is established, and terminals 6 and 7
When this happens, continuity is established and a relay output is generated.

Problems that the invention aims to solve As mentioned above, the conventional time relay circuit generates the relay output after a certain delay time determined by the charging time constant of the capacitor _C1 after turning on the DC power. , so-called delayed operation characteristics have been achieved. However, in the conventional circuit, power is supplied to the electronic circuits such as the thyristor 5 and the gate pulse generation circuit 3 even after the relay output is generated after a predetermined delay time has elapsed, so disturbance noise such as surge voltage is generated. There was a problem that it was easy to get in and easily cause trouble. In addition, since the thyristor 5 is in a conductive state while the relay output is being generated, a large amount of power is consumed by the current limiting resistor _R1 connected in series with the thyristor, which increases heat generation, increases the temperature, and reduces power supply efficiency. There was a problem that it was bad.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes two relays, a first and a second relay, which operate when DC power is turned on, and the second relay and a thyristor. and a gate pulse generation circuit are connected in parallel to the power supply, and after a certain delay time from turning on the DC power supply, the gate pulse generation circuit gates the thyristor to conduction, and the thyristor activates the second relay. In a time delay relay circuit configured to generate a relay output when a short circuit is recovered and an AND condition between a recovery contact of the second relay and an operation contact of the first relay, the first relay Power is supplied through a parallel connection circuit between the operating contact of the second relay and the operating contact of the switching contact of the first relay, and the second relay and
A parallel connection circuit of the thyristor and the gate pulse generation circuit is supplied with power through a parallel connection circuit of the recovery side contact of the switching contact of the first relay and the operation contact of the second relay, and The second relay, the thyristor, and the gate pulse generation circuit are supplied with power through a parallel connection circuit of a recovery contact of the first relay and an operating contact of the second relay, and the second relay is After the short circuit is recovered by the thyristor, the second relay, the thyristor, and the gate pulse generation circuit are automatically disconnected from the power supply.

Action After a certain delay time, when the short-circuit of the second relay is restored by the thyristor and the output of the time relay circuit is generated, the output of the second relay, the thyristor, which was previously given through the operating contact of the second relay, is The gate pulse generating circuit and the gate pulse generating circuit are separated in terms of circuits, and the supply of power to them is cut off. Therefore, after the relay output is generated, no current flows through the thyristor, and almost no heat is generated in the current limiting resistor connected in series with the thyristor. Further, since the circuit is completely separated, electronic circuits such as the thyristor and the gate pulse generation circuit are not affected by disturbance noise such as surge voltage.

Embodiment FIG. 1 shows an embodiment of the present invention, and the same reference numerals as in the conventional circuit of FIG. 2 indicate the same elements.

As is clear from the diagram, the time relay circuit according to the present invention supplies power to the second relay 2R, thyristor 5, and gate pulse generation circuit 3 through the switching contact _1R3 of the first relay 1R. Recovery side contact and operation contact 2 of second relay 2R
It is characterized in that it is constructed so that it is performed through a parallel connection circuit of _R3 . In the conventional circuit (FIG. 2), power is supplied to each of the above elements and circuits by directly connecting them to a power source.

To explain the operation of the circuit in Figure 1, when DC power is applied between terminals 1 and 2, power is supplied to the second relay 2R via the recovery side contact of the switching contact _1R3 of the first relay 1R. , the second relay 2R operates. When relay 2R operates, its operating contact 2
Self-holding by R ₃ , and at the same time operating contact 2R ₁
to operate the first relay 1R. 1st
When relay 1R operates, its switching contact 1R ₃
Self-holding via the operating side contact.

After a certain delay time has elapsed, when the thyristor 5 is made conductive by the gate pulse generation circuit 3, the second relay 2R is restored from the short circuit as in the conventional case, and its restoration contact 2R ₂ and the operating contact 1R ₂ of the first relay 1R are connected. Due to the AND condition, the terminals 6 and 7 of the output circuit are made conductive and a relay output is generated.

When the second relay 2R is short-circuited by the thyristor 5, its operating contact _2R3 is restored,
The second relay 2R, thyristor 5, and gate pulse generation circuit 3 are disconnected in terms of circuitry, and the power supply is cut off.

For this reason, the current limiting resistor, which conventionally caused the short-circuit current of the thyristor 5 to continue to flow and cause temperature rise.
The current in R ₁ also disappears.

Effects of the invention Since the invention has the configuration and operation as explained above, the temperature rise in the thyristor relay circuit is reduced, the power supply efficiency is improved, and after the relay output is generated, the thyristor and its surrounding electronic circuits are Since the circuit is disconnected from the power supply, it is less affected by disturbance noise, and the occurrence of circuit failures is also reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the time element relay circuit of the present invention, and FIG. 2 is a circuit diagram of a conventional time element relay circuit. 1, 2... Power terminal, 3... Gate pulse generation circuit, 4... Single junction transistor, 5... Thyristor, 6, 7... Output terminal, 1R... First relay, 2R... Second Relay, 1R ₃ ... switching contact of the first relay, 2R ₃ ... operating contact of the second relay.

Claims (1)

[Scope of utility model registration request] comprising two relays, a first and a second relay, which operate when DC power is turned on, the second relay;
A thyristor and a gate pulse generation circuit are connected in parallel to a power source, and after a certain delay time from turning on the DC power, the gate pulse generation circuit gates the thyristor to conduction, and the thyristor activates the second relay. The short circuit is restored and the second
In a delay operation type time element relay circuit configured to generate a relay output according to an AND condition of a recovery contact of the relay and an operation contact of the first relay,
The first relay connects the operating contacts of the second relay with the first
Power is supplied through a parallel connection circuit between the operating side contact of the switching contact of the relay, and the second relay,
A parallel connection circuit of the thyristor and the gate pulse generation circuit is supplied with power through a parallel connection circuit of the recovery side contact of the switching contact of the first relay and the operation contact of the second relay, and After the second relay is short-circuited by the thyristor, the second relay
A time relay circuit characterized in that the relay, thyristor, and gate pulse generation circuit are automatically disconnected from the power supply.