CN202978870U

CN202978870U - Non-contact direct-current relay

Info

Publication number: CN202978870U
Application number: CN 201220680298
Authority: CN
Inventors: 钱立文
Original assignee: Anhui Tongfeng Electronics Co Ltd
Current assignee: Anhui Tongfeng Electronics Co Ltd
Priority date: 2012-12-11
Filing date: 2012-12-11
Publication date: 2013-06-05
Anticipated expiration: 2022-12-11

Abstract

The utility model relates to a non-contact direct-current relay that comprises a box body, a power input terminal and a common terminal. The power input terminal is fixed outside the box body and is connected with a direct-current power supply; and the common terminal is connected with a controller common terminal. At least one set of switch assemblies is arranged inside the box body; and a control terminal as well as input and output terminals is fixed outside the box body, wherein control terminal, the input terminal and the output terminal are electrically connected with the switch assembly. The switch assembly includes a triode and a backward freewheeling diode; the base electrode, the collector electrode and the emitter electrode are of the triode are respectively and electrically connected with the control terminal, the input terminal and the output terminal; and the backward freewheeling diode is connected in series between the power input terminal and the collector electrode of the triode. According to the utility model, the triode is used as the switch assembly; and the non-contact connection of the relay is realized, thereby prolonging the service life of the relay.

Description

The contactless direct current relay

Technical field

The utility model relates to a kind of direct current relay, specifically a kind of contactless direct current relay.

Background technology

In automatic control system, when controlling the frequent inductive load that uses (as electromagnetically operated valve etc.) with conventional DC electromagnetic relay contact, when relay contact separated, inductive load can produce induced electromotive force, thereby at relay contact place's generation electric arc, cause spark, the high temperature of spark can make the contact surface iron loss, thereby reduces contact endurance, and this has not only increased the control system maintenance cost, make even to control and lost efficacy, have a strong impact on control object (as the product of producing) quality.In field of industrial automatic control, existing solution has two kinds: the one, and particular drive customized according to inductive load, the method versatility is poor, and cost is also relatively high; The 2nd, self-control Perceptual Load Drive Circuit plate, but the self-control circuit board is often installed in electrical control cubicles, wiring is all very inconvenient.

Summary of the invention

The purpose of this utility model is to provide a kind of contactless direct current relay, need not use mechanical contact, can improve the useful life of relay.

The utility model is achieved in that and comprises box body, be fixed on the box body outer power input terminal that is connected with DC power supply and the public terminal that is connected with the controller common port, at least be provided with one group of switch module in box body, box body is fixed with the control terminal that is electrically connected to this switch module and input, lead-out terminal outward; Described switch module comprises triode and reverse fly-wheel diode, and the base stage of triode, collector and emitter are electrically connected to control terminal and input, lead-out terminal respectively; Oppositely fly-wheel diode is connected between the collector electrode of power input and triode.

The utility model can substitute existing direct current electromagnetic relay open in usual.When control terminal had signal, the base stage of triode obtained to excite level, and the collector and emitter conducting makes conducting between input and output terminal.The inverse electromotive force that this moment, inductive load produced is through oppositely fly-wheel diode loop shunting.

For the ease of the identification relay whether in working order, the described switch module luminous indicating circuit that also comprises between a collector electrode that is connected on power input terminal and triode, formed by current-limiting resistance and light-emitting diode.When triode conducting collector potential descended, the light-emitting diode conducting was luminous, showed that relay is in conducting state.

As shown from the above technical solution, the utility model utilizes switch module coil and the armature in the alternative electromagnetic relay of triode, do not need existing conventional DC electromagnetic relay surface structure is done any variation, can realize the contactless connection of relay, be fit to existing conventional DC electromagnetic relay is improved, be connected with other electric equipments with convenient.The destruction of adopting simultaneously reverse fly-wheel diode can protect triode not to be subjected to the inverse electromotive force that inductive load produces can extend useful life of relay.

Description of drawings

Fig. 1 is the utility model electrical schematic;

Fig. 2 is the utility model relay construction schematic diagram;

Fig. 3 is the upward view of Fig. 2.

Embodiment

Following examples are to have three groups of contactless direct current relays as example.

Circuit theory as shown in Figure 1, three groups of switch module G ₁, G ₂, G ₃Select TIP142 to commonly use field-effect transistor, G ₁, G ₂, G ₃Base stage be connected on

control terminal

1,2,3, G ₁, G ₂, G ₃Collector electrode be connected electrically in respectively on

input terminal

4,5,6, G ₁, G ₂, G ₃Emitter be connected electrically in respectively on lead-

out terminal

7,8,9.Lead-

out terminal

7,8,9 is shorted together and is connected electrically in dc power cathode-V is on power output terminal 12; Public terminal 10 is common port COM, and common port COM passes through resistance R ₄Be that power input terminal 11 is connected with dc power anode+V; G ₁, G ₂, G ₃Collector electrode and dc power anode+V be connected to respectively reverse sustained diode between power input terminal 11 ₁, D ₂, D ₃D ₁, D ₂, D ₃Negative pole meet dc power anode+V, positive pole meets respectively G ₁, G ₂, G ₃Collector electrode.

For every group of working condition of indication directly perceived, G ₁, G ₂, G ₃Collector electrode on be connected to respectively LED ₁, LED ₂, LED ₃, LED ₁, LED ₂, LED ₃By current-limiting resistance R ₁, R ₂, R ₃Be connected with dc power anode+V.

The utility model structure as shown in Figure 2 and Figure 3.box body is comprised of base 22 and outer cover 21, base 22 upper ends in outer cover 21 are arranged side by side three groups of

switch modules

23, 24, 25, every group of switch module comprises triode 231, reverse fly-wheel diode 234, consist of current-limiting resistance 233 and the light-emitting diode 232 of luminous indicating circuit, base 22 lower ends are provided with external binding post 1～12 correspondingly, terminal 1～9 is respectively the external binding post of three groups of switch modules, wherein, 1, 2, 3 is the control terminal of three groups of switch modules, 4, 5, 6 is the input terminal of three groups of switch modules, 7, 8, 9 is the lead-out terminal of three groups of switch modules.Terminal 10 is public terminal, and terminal 11 distributes identical with power supply input, the lead-out terminal of being connected for being connected with the power supply positive and negative electrode, the distribution of each terminal with the external binding post that direct current electromagnetic relay is often driven in LY3NJ model three contacts, Omron.

During work, when the signal of PLC controller makes terminal 10(common port COM) connect G with terminal 3 ₁Saturation conduction, inductive load F ₁Action, LED ₁Luminous.When control signal makes pin 10 disconnect with pin 3, G ₁Cut-off, inductive load F ₁Be failure to actuate, LED ₁Not luminous.Inductive load F ₂, F ₃The rest may be inferred for operating principle.

The outer lead-out

terminal

7,8,9 that 12, three groups of switch modules of power output terminal can be set of the utility model base can be distinguished directly and is connected with the power cathode of load.

Claims

1. contactless direct current relay, comprise box body, be fixed on the box body outer power input terminal (11) that is connected with DC power supply and the public terminal (10) that is connected with the controller common port, at least be provided with one group of switch module (23) in box body, box body is fixed with the control terminal (1) that is electrically connected to this switch module and input, lead-out terminal (4,7) outward; It is characterized in that: described switch module (23) comprises triode (231) and reverse fly-wheel diode (234), and the base stage of triode (231), collector and emitter are electrically connected to control terminal (1) and input, lead-out terminal (4,7) respectively; Oppositely fly-wheel diode (234) is connected between the collector electrode of power input terminal (11) and triode (231).

2. contactless direct current relay according to claim 1 is characterized in that: the luminous indicating circuit that described switch module (23) also comprises between a collector electrode that is connected on power input terminal and triode, be comprised of current-limiting resistance (232) and light-emitting diode (233).