CN217387018U

CN217387018U - Relay switch

Info

Publication number: CN217387018U
Application number: CN202123315593.5U
Authority: CN
Inventors: 林育超
Original assignee: Kudom Electronics Technology Xiamen Co ltd
Current assignee: Kudom Electronics Technology Xiamen Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-09-06
Anticipated expiration: 2031-12-27

Abstract

The utility model relates to an electron device technical field. The utility model discloses a relay switch, including solid state relay circuit, electromagnetic relay circuit and time delay turn-off circuit, the input of solid state relay circuit and electromagnetic relay circuit connects this relay switch's control input simultaneously, and the output of solid state relay circuit and electromagnetic relay circuit connects this relay switch's output simultaneously, and the time delay turn-off circuit sets up on solid state relay circuit's input for control solid state relay circuit time delay turn-off. The utility model discloses under the prerequisite that need not extra radiator, still have very long life-span, simple structure, it is small, the cost is lower.

Description

Relay switch

Technical Field

The utility model belongs to the technical field of the electron device, specifically relate to a relay switch.

Background

The relay is mainly a contact type relay and a contactless type relay. When a contact type relay such as an electromagnetic relay is turned on, the contact hardly generates heat because the contact resistance is small. However, since electric spark is easily generated in the switching process, the contact is ablated every time the switch is switched, so that the electric life of the electromagnetic relay is far shorter than the mechanical life of the electromagnetic relay. Contactless relays, such as ac solid-state relays, employ semiconductor devices as switching elements, and no electric spark is generated during the switching process, so that the switching life is long, usually more than 5000 ten thousand times. However, since the semiconductor devices have conduction voltage drop, when conducting, the semiconductor will generate heat, and needs to be processed by a heat sink, otherwise, the solid-state relay may be damaged due to overheating.

Disclosure of Invention

An object of the utility model is to provide a relay switch is used for solving the technical problem that above-mentioned exists.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a relay switch, includes solid state relay circuit, electromagnetic relay circuit and time delay turn-off circuit, and the input of solid state relay circuit and electromagnetic relay circuit connects this relay switch's control input simultaneously, and the output of solid state relay circuit and electromagnetic relay circuit connects this relay switch's output simultaneously, and the time delay turn-off circuit sets up on solid state relay circuit's input for control solid state relay circuit time delay turn-off.

Further, the delay turn-off circuit is implemented by using a charging capacitor C1.

Furthermore, the time-delay turn-off circuit further comprises a diode D2 and a resistor R1, wherein the positive terminal of the diode D2 is connected to the positive control input terminal of the relay switch, the negative terminal of the diode D2 is connected to the series resistor R1 and the first terminal of the charging capacitor C1, the second terminal of the charging capacitor C1 is connected to the negative control input terminal of the relay switch, and the first terminal of the charging capacitor C1 is connected to the positive input terminal of the solid-state relay circuit.

Furthermore, the time-delay turn-off circuit further comprises a first unidirectional turn-on circuit, and the first end of the charging capacitor C1 is connected to the positive input end of the solid-state relay circuit through the first unidirectional turn-on circuit.

Further, the first unidirectional conducting circuit is implemented by using a diode D3.

Furthermore, the delay turn-off circuit further comprises a second one-way conduction circuit, an input end of the second one-way conduction circuit is connected with the positive control input end of the relay switch, and an output end of the second one-way conduction circuit is connected with the positive input end of the solid-state relay circuit.

Further, the second unidirectional conducting circuit is implemented by using a diode D1.

Furthermore, the circuit also comprises a constant current circuit which is connected in series in an input loop of the solid-state relay circuit.

Furthermore, the constant current circuit comprises a resistor R2, a resistor R3, an NPN triode T1 and an NPN triode T2, wherein a collector series resistor R2 of the NPN triode T1 is connected with the positive input end of the solid-state relay circuit, an emitter of the NPN triode T1 is connected with the negative control input end of the relay switch, a base of the NPN triode T2 is connected with a collector of the NPN triode T1, a collector of the NPN triode T2 is connected with the negative input end of the solid-state relay circuit, and an emitter series resistor R3 of the NPN triode T2 is connected with an emitter of the NPN triode T1.

The utility model has the advantages of:

the utility model discloses under the prerequisite that need not extra radiator, still have very long life-span, simple structure, it is small, the cost is lower.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in figure 1, the relay switch comprises a solid-state relay circuit, an electromagnetic relay circuit and a time delay turn-off circuit, wherein the input ends of the solid-state relay circuit and the electromagnetic relay circuit are simultaneously connected with the control input ends 3+ and 4-of the relay switch, the output ends of the solid-state relay circuit and the electromagnetic relay circuit are simultaneously connected with the output ends 1-2-of the relay switch, and the time delay turn-off circuit is arranged on the input end of the solid-state relay circuit and is used for controlling the time delay turn-off of the solid-state relay circuit.

In this embodiment, the electromagnetic relay circuit is composed of an electromagnetic relay S1, and the specific circuit structure is shown in fig. 1. The solid-state relay circuit is an alternating-current solid-state relay circuit and comprises an optocoupler A1, a resistor R4, a resistor R5 and a bidirectional thyristor T3, and specific circuit connections are shown in fig. 1 in detail, which is not detailed, and certainly, in some embodiments, the solid-state relay circuit can also be implemented by other existing solid-state relays.

In this embodiment, the delay turn-off circuit is implemented by using the charging capacitor C1, and the circuit has a simple structure, is easy to implement, and has a low cost, but not limited thereto.

Further, in this embodiment, the delay shutdown circuit further includes a diode D2 and a resistor R1, the positive terminal of the diode D2 is connected to the positive control input terminal 3+ of the relay switch, the negative terminal of the diode D2 is connected to the series resistor R1 and is connected to the first terminal of the charging capacitor C1, the second terminal of the charging capacitor C1 is connected to the negative control input terminal 4-of the relay switch, and the first terminal of the charging capacitor C1 is connected to the positive input terminal of the opto-coupler a1 (the positive input terminal of the solid-state relay circuit). The resistor R1 plays a role in charging and current limiting, and avoids the influence on driving the conduction of the solid-state relay circuit and the electromagnetic relay circuit caused by the fact that the voltage of the control input ends 3+ and 4-of the relay switch is pulled too low when the charging capacitor C1 starts to charge.

Further, in this embodiment, the delay shutdown circuit further includes a first unidirectional conducting circuit, and the first end of the charging capacitor C1 is connected to the positive input end of the optocoupler a1 through the first unidirectional conducting circuit, so as to avoid that the current supplied to the positive input end of the optocoupler a1 charges the charging capacitor C1 to affect the conducting speed of the optocoupler a 1.

Preferably, in this embodiment, the first unidirectional conducting circuit is implemented by using the diode D3, and the circuit structure is simple, easy to implement, and low in cost, but not limited thereto, and in some embodiments, the first unidirectional conducting circuit may also be implemented by using other existing unidirectional conducting circuits.

Further, in this embodiment, the delay shutdown circuit further includes a second unidirectional conducting circuit, an input end of the second unidirectional conducting circuit is connected to the positive control input end 3+ of the relay switch, an output end of the second unidirectional conducting circuit is connected to the positive input end of the optical coupler a1, and the second unidirectional conducting circuit prevents the charging capacitor C1 from discharging to the control input ends 3+ and 4-of the relay switch and the input end of the electromagnetic relay circuit to affect the delay shutdown time of the solid-state relay circuit, thereby improving reliability and stability.

Preferably, in this embodiment, the second unidirectional conducting circuit is implemented by using a diode D1, and the circuit structure is simple, easy to implement, and low in cost, but not limited to this, and in some embodiments, the second unidirectional conducting circuit may also be implemented by using other existing unidirectional conducting circuits.

Further, in this specific embodiment, the charging circuit further includes a constant current circuit, and the constant current circuit is connected in series in an input loop (an input loop of the solid-state relay circuit) of the optical coupler a1 to control a current magnitude of the input loop of the optical coupler a1, so as to control a discharging time of the charging capacitor C1, that is, to control a time delay turn-off time of the solid-state relay circuit, thereby improving reliability and stability, and the charging capacitor C1 is easy to select, easy to implement, and low in cost.

In this embodiment, the constant current circuit includes a resistor R2, a resistor R3, an NPN transistor T1, and an NPN transistor T2, wherein a collector series resistor R2 of the NPN transistor T1 is connected to the positive input terminal of the optical coupler a1, an emitter of the NPN transistor T1 is connected to the negative control input terminal 4 of the relay switch, a base of the NPN transistor T2 is connected to a collector of the NPN transistor T1, a collector of the NPN transistor T2 is connected to the negative input terminal of the optical coupler a1, and an emitter series resistor R3 of the NPN transistor T2 is connected to an emitter of the NPN transistor T1. The circuit has a simple structure, is easy to implement, and has a low cost, but the circuit is not limited to this, and in some embodiments, the circuit can also be implemented by using other existing constant current circuits.

In this specific embodiment, the solid-state relay circuit further includes a resistor R6 and a capacitor C2, the resistor R6 and the capacitor C2 are connected in series and then are connected in parallel with the triac T3, and the resistor R6 and the capacitor C2 form a resistance-capacitance absorption loop, so that the survival capability of the triac T3 under electric shock is improved.

The working principle is as follows:

conducting process: when control voltage is applied to the control input ends 3+ and 4-, the control voltage supplies power to the input end of the optocoupler A1 through the diode D1, the input end of the optocoupler A1 has current, the output end of the optocoupler A1 is conducted to trigger the conduction of the bidirectional controllable silicon T3, and the voltage of the output ends 1-2-is reduced to the conduction voltage drop of the bidirectional controllable silicon T3, which is about 1V. Meanwhile, the control voltage supplies power to a coil (input end) of the electromagnetic relay S1, a contact at the output end of the electromagnetic relay S1 is closed and conducted, but because the action time of the electromagnetic relay is slow (the action time of the electromagnetic relay is about 4ms, and the action time of the solid-state relay is about 1ms), when the contact of the electromagnetic relay S1 is closed, because the bidirectional triode thyristor T3 is already conducted, the voltage at two ends of the electromagnetic relay S1 is reduced to about 1V, and when the contact is closed, electric sparks are hardly generated between the contacts. After the electromagnetic relay S1 is conducted, the voltage at the two ends of the output ends 1-2 is almost zero, and the bidirectional controllable silicon T3 is no longer in the conducting state, so that the bidirectional controllable silicon T3 can not generate heat any more, and no radiator is needed to be added for extra heat dissipation. At the same time, the control voltage charges the charging capacitor C1 through the diode D2 and the resistor R1.

And (3) a turn-off process: when the control voltage of the control input terminals 3+ and 4-is removed, because of the existence of the charging capacitor C1, the charging capacitor C3 continues to provide current for the input terminal of the optocoupler a1, so that the optocoupler a1 can still maintain a conducting state until the voltage of the charging capacitor C1 is reduced to a value that the optocoupler a1 cannot be maintained to be conducted. At this time, the electromagnetic relay S1 will open the contact of the output terminal quickly because the input terminal has no control voltage. In the process of contact disconnection, when the voltage at the two ends of the output ends 1-2 rises to the voltage (about 5V) which can be triggered and conducted by the bidirectional controllable silicon T3, because the optocoupler A1 is still in a conducting state, the optocoupler can trigger the bidirectional controllable silicon T3 to be conducted again, so that the voltage at the two ends of the output ends 1-2 is quickly reduced to about 1V, large electric sparks are prevented from being generated at the contact of the electromagnetic relay S1, the service life of the electromagnetic relay S1 is prolonged, and the service life of the electromagnetic relay S1 is close to the mechanical service life of the electromagnetic relay S3538.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A relay switch, characterized by: including solid state relay circuit, electromagnetic relay circuit and time delay turn-off circuit, the input of solid state relay circuit and electromagnetic relay circuit connects the control input of this relay switch simultaneously, and the output of solid state relay circuit and electromagnetic relay circuit connects the output of this relay switch simultaneously, and the time delay turn-off circuit sets up on the input of solid state relay circuit for control solid state relay circuit time delay is turn-off.

2. The relay switch of claim 1, wherein: the delay turn-off circuit is realized by adopting a charging capacitor C1.

3. The relay switch of claim 2, wherein: the time-delay turn-off circuit further comprises a diode D2 and a resistor R1, the positive end of the diode D2 is connected with the positive control input end of the relay switch, the negative end of the diode D2 is connected with a series resistor R1 to the first end of a charging capacitor C1, the second end of the charging capacitor C1 is connected with the negative control input end of the relay switch, and the first end of the charging capacitor C1 is connected with the positive input end of the solid-state relay circuit.

4. The relay switch of claim 3, wherein: the delay turn-off circuit further comprises a first one-way conduction circuit, and the first end of the charging capacitor C1 is connected with the positive input end of the solid-state relay circuit through the first one-way conduction circuit.

5. The relay switch of claim 4, wherein: the first unidirectional conducting circuit is implemented by using a diode D3.

6. The relay switch according to claim 3 or 4, wherein: the delay turn-off circuit further comprises a second one-way conduction circuit, the input end of the second one-way conduction circuit is connected with the positive control input end of the relay switch, and the output end of the second one-way conduction circuit is connected with the positive input end of the solid-state relay circuit.

7. The relay switch according to claim 6, wherein: the second unidirectional conducting circuit is implemented by using a diode D1.

8. The relay switch of claim 1, wherein: the constant current circuit is connected in series in an input loop of the solid-state relay circuit.

9. The relay switch of claim 8, wherein: the constant current circuit comprises a resistor R2, a resistor R3, an NPN triode T1 and an NPN triode T2, wherein a collector electrode series resistor R2 of the NPN triode T1 is connected with the positive input end of the solid-state relay circuit, an emitter electrode of the NPN triode T1 is connected with the negative control input end of the relay switch, a base electrode of the NPN triode T2 is connected with a collector electrode of the NPN triode T1, a collector electrode of the NPN triode T2 is connected with the negative input end of the solid-state relay circuit, and an emitter electrode series resistor R3 of the NPN triode T2 is connected with an emitter electrode of the NPN triode T1.