JPH0243075Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Technical field] This invention turns on the load with a single shot operation.
The present invention relates to a load operation circuit that switches off.

[Background technology]

Conventionally, as shown in FIG.
, push-on type operation switch
Transistors Tr ₁ complementary to each other at the NO contact of SW,
A parallel circuit of Tr ₂ is connected in series, and a series circuit of the NC contact of the above operation switch and a capacitor C ₄ such as a non-polar electrolytic capacitor is connected in parallel to this series circuit, and the charging load of this capacitor C ₄ is connected in parallel. was applied to the base circuits of the transistors Tr ₁ and Tr ₂ . In the circuit shown in FIG. 1, the operated part 1 is constructed by connecting a parallel circuit of diodes D ₁ and D ₂ that are reversely connected to each other and the switching contact r ₁ of the relay Ry in series with the winding of the relay Ry. and a resistor R ₁ and a capacitor C ₁ ,
A phase input compensation circuit 3 consisting of C ₂ is added, and a capacitor C ₃ is connected in parallel to the relay Ry winding. In addition, in the operation switch section 2, diodes D ₃ to _{D 5} and a light emitting diode LD ₁
is a diode for preventing reverse breakdown voltage, and the light emitting diode LD ₁ also serves as an operation display element, and a malfunction prevention circuit 4 is constituted by capacitors C ₅ and C ₆ and resistors R ₄ and R ₅ . Thus, the load operation circuit 5 as described above can be operated by connecting its terminals A, B, and C to the commercial power source 6 and the transmission lines 7, 7' as shown in FIG. By operating the operation switch section 2 of the load operation circuit 5, the operated section 1 of each load operation circuit 5 is operated, and the load circuit 8 is turned on and off by opening and closing the output contact _r2 of each corresponding relay Ry. It is something to do. As the relay Ry, a latching type is used in which the armature, which is pivotally supported in the center, is reversibly rotated depending on the excitation direction of the winding to switch the contacts.

However, in the conventional example described above, the operation switch is activated at time _t1 by operating the operation switch section 2.
Assuming that the NC contact of the SW is released, the capacitor _C4 starts discharging from that moment as shown in Figure 3A, so at the time _t2 when the NO contact of the operating switch SW closes, the capacitor C4 starts to discharge as shown in the figure. This means that the voltage across _C4 has decreased considerably. Therefore, the base current value of the transistor Tr ₁ or Tr ₂ at the time when the NO contact of the operating switch SW closes and the reverse current begins to flow through the winding of the relay Ry is determined by the characteristics of the operating switch SW from time t ₁ to t ₂ . If the current flowing through the winding of the relay Ry at this point is less than the threshold level necessary for reversing the relay Ry due to variations in the time t, there is a problem that an intermediate stop occurs. Moreover, once such an intermediate stop of relay Ry occurs,
Since the switching contact _r1 is connected to the winding of the relay Ry, it is impossible to return it to the operating state even if the operation switch SW is operated, and the only option is to dispose of it as a defective product. Therefore, in the past, a separate defective product screening process was set up to sort out such defective products, which caused problems that increased costs and also resulted in omission of checks in the defective product selection process. In this case, there was a problem that defective products would end up on the market.

[Purpose of invention]

The present invention provides a load operation circuit in which the electric charge of the capacitor is discharged to the base circuit of the transistor after the operation switch is completely switched to the NO side, thereby preventing an intermediate stop during relay switching. The purpose is to

[Disclosure of invention]

FIG. 4 shows a circuit according to an embodiment of the present invention, in which one end of the parallel circuit of both transistors Tr ₁ and Tr ₂ is directly connected to one end of the winding of the relay Ry, compared to the conventional example shown in FIG. Connect a series circuit of a low resistor R ₂ , the NC contact of the operating switch SW, and a capacitor C ₄ between terminal C at the other end of the winding, and connect a current limiting resistor R ₆ and a light emitting diode LD in parallel to this series circuit. An operation display circuit 9 consisting of a series circuit of _{Tr 1} and a diode D ₇ is connected, and the charge of the capacitor C ₄ is supplied to the base circuit of both transistors Tr ₁ and Tr ₂ via the NO contact of the operating switch SW. It is structured like this. Thus, in this embodiment, the capacitor _C4 is constantly charged via the resistor R2, and when the operating switch SW is operated, the capacitor C4 is charged via the resistor _R2 .
When the NO contact is closed, the charge in capacitor C ₄ is transferred to transistor Tr ₁ or Tr ₂ as shown in Figure 3 (b).
will be discharged into the base circuit of the relay
Sufficient current flows through the Ry winding to reverse the current, and there is no possibility that relay Ry will stop in the middle.

FIG. 5 shows an example in which the operated part 1 and the operation switch part 2 are configured as separate bodies, in which a circuit of capacitor _C4 and an operation display circuit 9 are connected between terminals B and C. As shown in the block diagram in Figure 6, if a large number of operation switch units 2 are connected in parallel between terminals B and C, the load circuit 8 can be turned on or off by operating any of these operation switch units 2. It is something that can be done.

[Effect of idea]

The present invention is constructed as described above, and the operation switch
Since the charge of the capacitor is discharged to the base circuit of the transistor through the NO contact, the base current of the transistor can be maximized at the time when the NO contact of the operating switch is closed, and therefore the relay winding This has the advantage that a sufficient reversal current can be passed through the relay, and malfunctions due to intermediate stoppage of the relay will not occur.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of the conventional example, Fig. 2 is a block diagram of the same state of use as above, Fig. 3 is an operation explanatory diagram comparing the conventional example and the embodiment of the present invention, and Fig. 4 is the circuit diagram of the embodiment of the present invention. The circuit diagram, FIG. 5 is a circuit diagram of another embodiment of the present invention, and FIG. 6 is a block diagram of the same in use, Ry is a relay, r ₁ is its switching contact, D ₁ and D ₂ are respectively A diode, _C4 is a capacitor, _Tr1 and _Tr2 are transistors, SW is an operating switch, 1 is an operated part, and 2 is an operating switch part.

Claims (1)

[Scope of utility model registration request] A latching type relay is provided in which a pivoted armature is reversibly rotated in accordance with the excitation direction of the winding to switch contacts, and a parallel circuit of diodes connected in reverse to each other and the switching contact of the relay is connected to the winding of the relay. In a load operation circuit in which an operated part is connected in series with a wire, and an operation switch part is provided in which the operated part is supplied with a current of a polarity corresponding to the contact switching state of the relay for a short time, complementary transistors are connected to each other in series. Connect the parallel circuit in series to the above relay, and connect the series circuit between the NC contact of the push-on type operation switch and the capacitor to at least the parallel circuit between the switching contact of the operated part and the diode connected in reverse to each other. and a load operation circuit configured to discharge the charge of the capacitor to the base circuit of both of the transistors through the NO contact of the operation switch.