CN211880760U

CN211880760U - Electrical isolator based on differential signal conversion circuit

Info

Publication number: CN211880760U
Application number: CN202020575693.8U
Authority: CN
Inventors: 文渊
Original assignee: Shenzhen Duohe Electric Co ltd
Current assignee: Shenzhen Duohe Electric Co ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-11-06
Anticipated expiration: 2030-04-17

Abstract

The utility model discloses an electrical isolator based on differential signal conversion circuit, belonging to the technical field of isolators, comprising a shell with an open bottom, wherein the lower parts of the front and the back ends of the shell are both provided with first heat dissipation holes, a first dust screen is fixed between the inner walls of the first heat dissipation holes, a baffle is fixed between the left and the right inner walls of the shell and is positioned at the upper side of the first heat dissipation holes, the shell is divided into an upper sealing area and a lower opening area by the baffle, the lower end of the baffle is provided with two groups of second heat dissipation holes which are bilaterally symmetrical, a second dust screen is fixed between the inner walls of the two groups of second heat dissipation holes, the upper end of the baffle is fixed with a heat dissipation fan through a base, the upper end of the baffle is fixed with four differential signal converters, each differential signal conversion circuit is arranged in each differential signal converter, the heat dissipation and dust prevention, low cost, good isolation effect and strong practicability.

Description

Electrical isolator based on differential signal conversion circuit

Technical Field

The utility model relates to an isolator technical field, more specifically say, relate to an electrical isolator based on differential signal converting circuit.

Background

The isolator can be matched with various sensors to isolate input, output and power signals, so that the anti-interference capability of the industrial production process is improved, and the stability and reliability of the system are ensured.

The current electrical apparatus isolator can produce a large amount of heats at the operation in-process, leads to its inside electronic device to be in the state of generating heat for a long time, and its radiating effect is not good, and prior art can only set up the louvre on the casing of installation usually after installing the isolator, but only relies on the radiating effect of louvre not very obvious, and the louvre of seting up simultaneously leads to the isolator to be stained with easily and stimulates the dust, and how to solve the dirt-proof problem of isolator heat dissipation is that we need solve.

Meanwhile, there are many electronic systems communicating with each other, in order to implement long-distance stable signal transmission, differential signals are generally used for transmission, such as RS485 communication, RS422 communication, etc., and some systems support multiple communications as usual, so that they must communicate through signal conversion.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

To the problem that exists among the prior art, the utility model aims to provide an electrical isolator based on differential signal conversion circuit, it dispels the heat dustproof effect is good, simple structure is compact, and is with low costs, and it is good to keep apart the effect, and the practicality is strong.

2. Technical scheme

In order to solve the above problem, the utility model adopts the following technical scheme:

an electrical isolator based on a differential signal conversion circuit comprises a shell with an opening at the bottom, wherein first heat dissipation holes are formed in the lower portions of the front end and the rear end of the shell, a first dust screen is fixed between the inner walls of the first heat dissipation holes, a partition is fixed between the left inner wall and the right inner wall of the shell and positioned above the first heat dissipation holes and divides the shell into an upper sealing area and a lower opening area, two groups of second heat dissipation holes are formed in the lower end of the partition, the two groups of second heat dissipation holes are bilaterally symmetrical, a second dust screen is fixed between the inner walls of the two groups of second heat dissipation holes, a heat dissipation fan is fixed at the upper end of the partition through a base, four differential signal converters are fixed at the upper end of the partition, a differential signal conversion circuit is arranged in each differential signal converter, the heat dissipation dustproof effect is good, and the structure, low cost, good isolation effect and strong practicability.

As a preferred scheme of the utility model, every group the second louvre all is provided with threely, difference signal converter and base are located between two sets of second louvres.

As an optimized scheme of the utility model, install AM26LS32ACDR chip, four in the base connect in parallel back and AM26LS32ACDR chip electric connection each other.

As an optimized scheme of the utility model, every differential signal conversion circuit all includes INPUT signal INPUT +, INPUT signal INPUT-, differential logic chip U1, current limiting resistor R1, earthing terminal GND, opto-coupler U2, OUTPUT signal OUTPUT and earthing terminal EGND, INPUT signal INPUT + is connected with differential logic chip U1's INPUT electricity, INPUT signal INPUT-is connected with differential logic chip U1's INPUT electricity, differential logic chip U1's OUTPUT and current limiting resistor R1's INPUT electric connection, current limiting resistor R1's OUTPUT is connected with opto-coupler U2's INPUT electricity, opto-coupler U2's OUTPUT is connected with earthing terminal GND electricity, opto-coupler U2's OUTPUT is connected with OUTPUT signal OUTPUT electricity, opto-coupler U2's OUTPUT is connected with earthing terminal EGND electricity.

As an optimized scheme of the utility model, opto-coupler U2 is by diode and triode coupling, current-limiting resistor R1's OUTPUT is connected with the input electricity of diode, the OUTPUT and the earthing terminal electricity of diode are connected, the OUTPUT and the OUTPUT signal OUTPUT electric connection of triode, the OUTPUT and the earthing terminal EGND electricity of triode are connected.

As a preferred scheme of the utility model, the triode is the NPN type triode, OUTPUT signal OUTPUT and the collecting electrode electric connection of NPN type triode, the projecting pole electric connection of earthing terminal and NPN type triode.

As an optimized scheme of the utility model, the projecting pole electric connection of NPN type triode has arrester F.

As an optimized scheme of the utility model, both ends all are fixed with the installation piece about the casing, the mounting hole has been seted up to the upper end of installation piece.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages of:

(1) this scheme produces the air-wind through radiator fan's effect, and wind blows out through two sets of second louvres, finally blows to the air through two first louvres, forms good circulation of air to carry out good heat dissipation, with the difference signal converter setting in the upper portion sealing area, can carry out good dustproof, through the setting of second dust screen and first dust screen, the dustproof effect of further increase simultaneously.

(2) The heat dissipation dustproof effect is good, the structure is simple and compact, the cost is low, the isolation effect is good, and the practicability is high.

Drawings

Fig. 1 is a front perspective view of an electrical isolator based on a differential signal conversion circuit according to the present invention;

fig. 2 is a schematic structural view of a second heat dissipation hole in an electrical isolator based on a differential signal conversion circuit according to the present invention;

fig. 3 is a schematic structural diagram of a heat dissipation fan in an electrical isolator based on a differential signal conversion circuit according to the present invention;

fig. 4 is a schematic circuit diagram of an electrical isolator based on a differential signal conversion circuit according to the present invention.

The reference numbers in the figures illustrate:

the differential signal converter comprises a shell 1, a mounting block 2, a mounting hole 3, a first heat dissipation hole 4, a first dust screen 5, a second heat dissipation hole 6, a second dust screen 7, a partition plate 8, a base 9, a heat dissipation fan 10 and a differential signal converter 11.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1, 2 and 3, an electrical isolator based on a differential signal conversion circuit comprises a housing 1 with an opening at the bottom, first heat dissipation holes 4 are formed at the lower parts of the front and rear ends of the housing 1, a first dust screen 5 is fixed between the inner walls of the first heat dissipation holes 4, a partition plate 8 is fixed between the left and right inner walls of the housing 1, and the partition plate 8 is positioned above the first heat dissipation holes 4, and the partition plate 8 divides the housing 1 into an upper sealed area and a lower open area, the lower end of the partition plate 8 is provided with two sets of second heat dissipation holes 6, the two sets of second heat dissipation holes 6 are bilaterally symmetrical, and a second dust screen 7 is fixed between the inner walls of the two groups of second heat dissipation holes 6, a heat dissipation fan 10 is fixed at the upper end of the partition plate 8 through a base 9, four differential signal converters 11 are fixed at the upper end of the partition plate 8, and a differential signal conversion circuit is arranged in each differential signal converter 11.

In this embodiment, the two first heat dissipation holes 4 are used for realizing air circulation after the housing 1 is installed, and a good dustproof effect is realized through the first dustproof net 5, because the bottom of the housing 1 is opened, the housing 1 is divided into an upper sealed area and a lower open area through the partition plate 8, so that the base 9, the heat dissipation fan 10 and the differential signal converter 11 are arranged in the sealed area, and dust is not easy to stick, the upper sealed area is not a complete sealed environment and is only an environment with good sealing performance, when the heat dissipation fan 10 is started, air is generated, namely air flow, and is blown out through the two groups of second heat dissipation holes 6 and finally blown into the air through the two first heat dissipation holes 4, so that good air circulation is formed, thereby realizing good heat dissipation, on the basis of good heat dissipation effect, through the arrangement of the second dustproof net 7 and the first dustproof net 5, in order to provide a good dust-proof effect, it should be noted that a switch (not shown) for turning on and off the heat-dissipating fan 10 is installed outside the housing 1.

Specifically, as shown in fig. 3, three second heat dissipation holes 6 are formed in each group, and the differential signal converter 11 and the base 9 are located between the two groups of second heat dissipation holes 6.

In this embodiment, two sets of second heat dissipation holes 6 are respectively disposed on the left and right sides of the heat dissipation fan 10, and the middle portion is used for mounting the base 9, the heat dissipation fan 10 and the differential signal converter 11.

Specifically, as shown in fig. 3, an AM26LS32ACDR chip (not shown) is embedded in the base 9, and the four differential signal converters 11 are electrically connected to the AM26LS32ACDR chip after being connected in parallel.

Specifically, as shown in fig. 4, each differential signal conversion circuit includes an INPUT signal INPUT +, an INPUT signal INPUT-, a differential logic chip U1, a current-limiting resistor R1, a ground terminal GND, an optical coupler U2, an OUTPUT signal OUTPUT, and a ground terminal EGND, where the INPUT signal INPUT + is electrically connected to a positive INPUT terminal of the differential logic chip U1, the INPUT signal INPUT-is electrically connected to a negative INPUT terminal of the differential logic chip U1, an OUTPUT terminal of the differential logic chip U1 is electrically connected to an INPUT terminal of the current-limiting resistor R1, an OUTPUT terminal of the current-limiting resistor R1 is electrically connected to an INPUT terminal of the optical coupler U2, an OUTPUT terminal of the optical coupler U2 is electrically connected to the ground terminal GND, an OUTPUT terminal of the optical coupler U2 is electrically connected to the OUTPUT signal OUTPUT, and an OUTPUT terminal of the optical coupler U2 is electrically.

In this embodiment, the differential signal conversion circuit realizes isolated transmission and transient peak suppression, and can increase the driving capability of output and drive a device with larger current, and through the setting of the differential logic chip U1, the multi-path differential signal can be converted with only a small amount of hardware, and meanwhile, the differential signal conversion circuit has a simple structure and low cost, and can realize good electrical isolation.

Preferably, the optocoupler U2 is coupled with a diode and a triode, an OUTPUT of the current limiting resistor R1 is electrically connected with an input end of the diode, an OUTPUT end of the diode is electrically connected with a ground terminal, an OUTPUT end of the triode is electrically connected with the OUTPUT signal OUTPUT, an OUTPUT end of the triode is electrically connected with the ground terminal EGND, the triode is an NPN type triode, the OUTPUT signal OUTPUT is electrically connected with a collector of the NPN type triode, and the ground terminal is electrically connected with an emitter of the NPN type triode.

Preferably, the emitter of the NPN type triode is electrically connected with a lightning arrester F, and the safety performance of the lightning arrester F is improved.

Specifically, as shown in fig. 1, the left and right ends of the housing 1 are fixed with mounting blocks 2, and the upper ends of the mounting blocks 2 are provided with mounting holes 3.

In this embodiment, the installation of the housing 1 is facilitated by the installation of the installation block 2 and the installation hole 3.

It is explicated that, the utility model discloses in the electronic device that involves all with external power source electric connection in order to realize the power supply, their model can be selected according to actual need, so do not do too much to describe again.

The working principle is as follows: start radiator fan 10, the air-out is produced after radiator fan 10 starts, and wind blows off through two sets of second louvres 6, finally blows to the air through two first louvres 4, forms good circulation of air to realize good heat dissipation, through the setting of second dust screen 7 and first dust screen 5 on the good basis of radiating effect, make it have good dustproof effect, the utility model discloses the dustproof effect of heat dissipation is good, and simple structure is compact, and is with low costs, and isolation effect is good, and the practicality is strong.

The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention.

Claims

1. An electrical isolator based on a differential signal conversion circuit comprises a shell (1) with an opening at the bottom, and is characterized in that: the lower parts of the front end and the rear end of the shell (1) are respectively provided with a first heat dissipation hole (4), a first dust screen (5) is fixed between the inner walls of the first heat dissipation holes (4), a clapboard (8) is fixed between the left inner wall and the right inner wall of the shell (1), and the partition (8) is positioned at the upper side of the first heat dissipation hole (4), and the partition (8) divides the shell (1) into an upper sealing area and a lower opening area, two groups of second heat dissipation holes (6) are arranged at the lower end of the clapboard (8), the two groups of second heat dissipation holes (6) are symmetrical left and right, and a second dust screen (7) is fixed between the inner walls of the two groups of second heat dissipation holes (6), a heat radiation fan (10) is fixed at the upper end of the clapboard (8) through a base (9), four differential signal converters (11) are fixed at the upper end of the partition plate (8), and a differential signal conversion circuit is arranged in each differential signal converter (11).

2. The electrical isolator based on the differential signal conversion circuit according to claim 1, wherein: each group of the second heat dissipation holes (6) is provided with three second heat dissipation holes, and the differential signal converter (11) and the base (9) are located between the two groups of the second heat dissipation holes (6).

3. The electrical isolator based on the differential signal conversion circuit according to claim 2, wherein: an AM26LS32ACDR chip is installed in the base (9), and the four differential signal converters (11) are electrically connected with the AM26LS32ACDR chip after being connected in parallel.

4. The electrical isolator based on the differential signal conversion circuit, according to claim 3, wherein: each differential signal conversion circuit all includes INPUT signal INPUT +, INPUT signal INPUT-, differential logic chip U1, current limiting resistor R1, ground terminal GND, opto-coupler U2, OUTPUT signal OUTPUT and ground terminal EGND, INPUT signal INPUT + is connected with differential logic chip U1's INPUT electricity, INPUT signal INPUT-is connected with differential logic chip U1's INPUT electricity, differential logic chip U1's OUTPUT and current limiting resistor R1's INPUT electric connection, current limiting resistor R1's OUTPUT is connected with opto-coupler U2's INPUT electricity, opto-coupler U2's OUTPUT is connected with ground terminal GND electricity, opto-coupler U2's OUTPUT is connected with OUTPUT signal OUTPUT electricity, opto-coupler U2's OUTPUT is connected with ground terminal EGND electricity.

5. The electrical isolator based on the differential signal conversion circuit according to claim 4, wherein: the opto-coupler U2 is by diode and triode coupling, the OUTPUT of current-limiting resistance R1 is connected with the input electricity of diode, the OUTPUT and the ground terminal electricity of diode are connected, the OUTPUT and the OUTPUT signal OUTPUT electric connection of triode, the OUTPUT and the ground terminal EGND electricity of triode are connected.

6. The electrical isolator based on the differential signal conversion circuit according to claim 5, wherein: the triode is an NPN type triode, the OUTPUT signal OUTPUT is electrically connected with a collector of the NPN type triode, and the grounding end is electrically connected with an emitter of the NPN type triode.

7. The electrical isolator based on the differential signal conversion circuit according to claim 6, wherein: and an emitting electrode of the NPN type triode is electrically connected with a lightning arrester F.

8. A differential signal conversion circuit based electrical isolator according to any one of claims 1 to 7, wherein: the left end and the right end of the shell (1) are both fixed with mounting blocks (2), and mounting holes (3) are formed in the upper ends of the mounting blocks (2).