JPS5880231A - Pulse operation type relay drive circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a pulse-operated relay drive circuit.

Commonly used relays include those that require a continuous current to switch their contacts, and those that switch using pulsed current; the former has m solenoids and their KA moving contacts; The contacts are switched depending on the presence or absence of a drive current flowing through the solenoid, and the latter has two solenoids, and the contact is switched by passing a pulse current through one solenoid, and a pulse current flows through the other solenoid. The position of the contact is held until the current flows.

The present invention relates to a nine-relay drive circuit using a relay that is switched by a pulse current, and such a relay is hereinafter referred to as a pulse-operated relay.

The present invention provides a relay drive circuit that reliably drives a relay with the minimum drive current necessary for switching the relay by feeding back the operating state of the relay.

The reliability of switching the relay used as a means of remote control is the N of the remote control system.
In remote control systems, it is important to improve the quality of relays as well as improve drive circuits, including circuits that drive relays.

Conventionally, when driving a pulse-operated relay, a constant driving pulse force has been used, which is determined by the voltage and duration required to drive the relay. An example of the circuit in this case is shown in Fig. 1. Reference number 2.5 in Fig. 0 indicates a constant pulse ring pulse determined by an integrator circuit 4.50 time constant, which captures the fall of the voltage caused by the switching of switch 1. It is a monostable multivibrator that generates a tong. The nine pulses output from the monostable multivibrator 2.5 are amplified by the drive amplifier 6.7 to a voltage and current that can drive the relay, and then the solenoid of the relay 8. , 10 and switches the contact 11.

However, in such a relay drive circuit that generates a constant drive pulse number simply by the rise or fall of the input signal, the pulse width is adjusted to the above-mentioned variation because the response speed of the relay used varies. It is necessary to set the pulse width to the maximum value of There was a problem that the adjustment was complicated.

In addition, since pulse generation circuits such as monostable multivibrators are susceptible to noise, there is a high possibility that the enclosure will malfunction due to chatter or pulse noise in switch 1.
Furthermore, there are other problems such as having to re-operate the KFi switch in the event of a malfunction.

The present invention has been made in order to solve the above problems, and therefore, an object of the present invention is to feed back the operating state of the relay to the control circuit, and to improve the pulse width of the relay drive pulse using the aI performance ring. to control the necessary and sufficient pulse I
It is an object of the present invention to provide a novel relay drive circuit that can switch relays using IO current and realize highly reliable relay control that is resistant to switch chatter or external noise.

The above object of the present invention is to provide a switch circuit for switching a relay, a 4Ilh dynamic control circuit that generates a pulse current for controlling a relay based on the output of a logic switch circuit, and a drive control circuit. A relay drive circuit having a pulse-operated relay that is operated, wherein the output of the switch circuit and the operating state of the pulse-operated relay are subjected to a logic operation based on a III-type excitation control circuit to generate a drive pulse. Achieved by a nine-pulse-operated relay drive circuit, characterized in that the pulse-operated relay #i is driven with the optimum energized time necessary for the pulse-operated relay by controlling the generation and energization time of the pulse-operated relay. Ru.

Hereinafter, one preferred embodiment of the present invention will be specifically explained with reference to the drawings.

One embodiment of the present invention is shown in 11281. In the figure, reference number 1 is a switch for switching relay 8, and 15 is a logical operation processing of the output A%B of switch 1 and feedback E and F from relay 8. The drive control circuit 6.7 that generates drive pulses indicates a drive amplifier that amplifies the output 01D of the control circuit 15 to a voltage and current that can drive the relay.

Next, the operation of this embodiment will be explained. Figure 1112 shows the initial state in which contacts 11 and 12 of relay 8 are closed.Now, when switch 1 is turned to bllll, control circuit 1!10 human power B becomes low level, and then The output becomes high level, and the amplifier 7 causes current to flow through the solenoid 10 of the relay 8, and the contact 11.
12 can be switched. ζHere, the open/closed state of the contact 11 is determined by feedback from one contact of the relay 8 to the control circuit 13 as a feedback signal. connected to the
The control circuit 1S maintains the drive current until the relay 8 is completely switched and the a side of the contact 11 is open and the contact signal E is at a high level Kl, and one of the contacts is closed and the feedback signal I is at a low level. Flow I! be under control.

The details of the operation of the truth control circuit 16 will be explained based on the truth table 111. However, the high level of the voltage is @1'' and the low level is @0'', and when the output of the control circuit 13 is at a high level, l1III! Assume that a current flows through the nine-threnoid. State (2) of the truth table represents a steady state in which the contact 11 of the relay 8 is closed, and state (2) represents a steady state in which the a side of the contact 11 of the relay 8 is closed.

State m■ and state ■ are the states immediately after the switch 1 is reversed from the steady state and indicate transient states leading to the steady state ■ or ■, respectively, and the solenoid of the relay 8? Or current is flowing through 10. The states ■, ■, ■, and ■ also represent the transient state of relay switching, and all of the contacts 11
Both the l and b sides are closed or both are open, indicating that relay switching has not been completed.

As is clear from this truth table, except for the steady state ■ and ■ where the contact 11 of the relay 8 has finished switching, all of them are transient states, and when the steady state is reached, the current continues to flow through the relay 8. Become.

To summarize the function of the control circuit in the relay drive circuit according to the present invention, it is specified by the switch to switch the relay, the round state and the relay state are always compared, and if both do not match, the KFi is made to match. Therefore, the relay drive circuit according to the present invention has the advantage that there is no need to change the constants of the control circuit depending on the response speed of the pulse-operated relay used. death,! Since IK does not require noise-resistant monostable multivibrators, etc., it not only reduces malfunctions caused by switch chatter or other disturbances, but also prevents the control circuit from working even if a malfunction occurs. yo)
It has the effect of instantaneously returning to a normal state.

This falsehood has been explained above with reference to a good example thereof,
It should be understood that these are merely illustrative, and that the present disclosure is not limited solely to the examples described herein.

[Brief explanation of drawings]

11111 is a circuit diagram showing an example of a conventional relay drive circuit,
FIG. 2 is a circuit diagram showing one embodiment of the present invention. 1...Switch for switching the relay 2, S...
・Monostable multivibrator, 4.5... - Integrating circuit that determines the output pulse of monostable multivibrator, 6.
7. O. Drive energizer, a...Pulse action type relay, ?
, 10・e11 A solenoid for switching the contacts of the relay, 11.12 ・・Contacts switched by the solenoid 9.10, 15・e・Control circuit Specialty Applicant NEC Co., Ltd. Agent Patent attorney Yutabe Kumagai Figure 1

Claims (1)

[Claims] A switch circuit for switching the relay, a drive control circuit that uses the output of the switch circuit to generate a pulse current for controlling the relay, and a pulse-operated relay driven by the drive control circuit. The output of the switch circuit and the operating state of the pass-action type relay are subjected to a logical operation on the drive control circuit to control the driver of the drive pulse and the energization time, thereby controlling the pulse-type relay. A pulse-operated ray drive circuit that is characterized by driving.