CN212988634U

CN212988634U - Intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions

Info

Publication number: CN212988634U
Application number: CN202021780637.4U
Authority: CN
Inventors: 彭涛; 邱广庭; 李清华; 顾春朋; 许毅
Original assignee: Kunshan Guoli Yuantong New Energy Technology Co ltd
Current assignee: Kunshan Guoli Yuantong New Energy Technology Co ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-04-16
Anticipated expiration: 2030-08-24

Abstract

The utility model discloses an intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions, which comprises a ceramic arc-extinguishing chamber, a main contact, a driving coil and a PCB board capable of controlling the driving coil to work, and is also provided with a temperature detection unit and an insulation detection unit, wherein the temperature detection unit is provided with a temperature acquisition point capable of detecting the temperature information of the surface and the inner cavity of the ceramic arc-extinguishing chamber and a temperature sensor capable of detecting the ambient temperature information around the ceramic arc-extinguishing chamber, and the temperature acquisition point and the temperature sensor are respectively and electrically connected with the PCB board; the insulation detection unit is electrically connected between the main contact and the driving coil so as to detect leakage current between the main contact and the driving coil, and is also electrically connected to the PCB; the PCB correspondingly controls the drive coils to be connected or disconnected with an external power supply according to the received temperature information and the received leakage current information. The intelligent high-voltage direct-current contactor has excellent over-temperature and insulation protection functions, and the safety of the direct-current contactor during application is well ensured.

Description

Intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions

Technical Field

The utility model relates to a contactor technical field specifically provides an intelligent high voltage direct current contactor with excess temperature and insulation protection function.

Background

Direct current contactor generally uses in electric automobile battery package, automatically controlled and fill electric pile, and these mounted positions are temperature sensitive position, in case the during operation has abnormal temperature all to arouse the spontaneous combustion, will take place electric fire. The specific reason is as follows: because of direct current contactor belongs to a high voltage heavy current device, in the circular telegram use, the contact can generate heat (temperature rise) phenomenon, this temperature and current-carrying condition, outside copper bar or cable current-carrying area and connection contact resistance, product self contact resistance etc. influence relation, when above arbitrary parameter changes, perhaps when installing copper bar cable locking department and appearing setback scheduling problem, the contact temperature of direct current contactor will appear unusual rising phenomenon, and when surpassing contactor and bearing the temperature or when the environment bears the temperature, the system just has the thermal runaway risk, can ignite surrounding object when serious.

Besides the above application risks, in the use process of the direct current contactor, the contact position is connected with a high-voltage power supply, and the coil control part is connected with a low-voltage control loop (a low-voltage negative pole of a common vehicle is connected with a vehicle body), so when the direct current contactor is applied to a new energy vehicle, a reliable insulation resistance value must be ensured between the high-voltage loop and the voltage loop, but the direct current contactor has a fault of insulation reduction between high voltage and low voltage in the use process, the fault can cause poor insulation between the high-voltage loop and a low-voltage system of the vehicle, and a high-voltage electric shock risk can possibly occur in.

Therefore, it is necessary to develop a device capable of intelligently monitoring the temperature and the insulation resistance value of the dc contactor during operation so as to ensure the safety of the dc contactor during application.

In view of this, the present invention is especially provided.

Disclosure of Invention

In order to overcome the defects, the utility model provides an intelligence high voltage direct current contactor, its novel structure, reasonable has excellent excess temperature and insulating protect function, fine security when having ensured direct current contactor and using.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: an intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions comprises a ceramic arc-extinguishing chamber, a main contact mounted on the ceramic arc-extinguishing chamber, a driving coil arranged outside the ceramic arc-extinguishing chamber, a PCB (printed circuit board) capable of controlling the driving coil to work, a temperature detection unit and an insulation detection unit, wherein the temperature detection unit is provided with a temperature acquisition point capable of detecting temperature information of the surface and the inner cavity of the ceramic arc-extinguishing chamber and a temperature sensor capable of detecting ambient temperature information around the ceramic arc-extinguishing chamber, and the temperature acquisition point and the temperature sensor are respectively and electrically connected to the PCB; the insulation detection unit is electrically connected between the main contact and the driving coil so as to detect leakage current between the main contact and the driving coil, and meanwhile, the insulation detection unit is also electrically connected to the PCB;

and the PCB correspondingly controls the drive coil to be connected or disconnected with an external power supply according to the received temperature information and the received leakage current information.

As a further improvement of the utility model, the temperature collection point is a metallized welding point formed on the ceramic arc-extinguishing chamber;

and the plurality of temperature acquisition points are respectively arranged at different positions of the ceramic arc extinguish chamber.

As a further improvement of the present invention, the temperature sensors are two, and two the temperature sensors are relatively installed on the outer wall of the ceramic arc extinguish chamber.

As a further improvement of the utility model, the location is provided with two magnetic conduction supports that are mutual disposition on ceramic interrupter's the roof outer wall, and two temperature sensor installs respectively in two on the magnetic conduction support.

As a further improvement, the insulation detection unit has detection switch, detection resistance and leakage current sensor, wherein, detection switch's one end is through concatenating the detection resistance back electricity connect in the main contact, detection switch's the other end is through concatenating the leakage current sensor back electricity connect in the both ends of drive coil, just leakage current sensor's data output interface with PCB board electric connection.

As a further improvement of the utility model, PCB board still electric connection in outside alarm device.

The utility model has the advantages that: the utility model discloses optimize the improvement to the direct current contactor structure, it can survey to have add one the temperature detecting element and one of ceramic explosion chamber surface and inner chamber and surrounding environment temperature information can detect the main contact with the insulating detecting element of the leakage current between the drive coil, just the temperature detecting element with insulating detecting element still all electricity connect in the PCB board to realize: when the temperature information received by the PCB exceeds a set value, the PCB controls the driving coil to be disconnected with an external power supply, namely the direct current contactor is controlled to be disconnected, and the direct current contactor is prevented from generating safety risk due to continuous temperature rise; and when the leakage current value received by the PCB exceeds a set value, the insulation resistance value between the high-voltage loop and the low-voltage loop is reduced, and the PCB controls the driving coil to be disconnected from an external power supply, namely the direct current contactor is controlled to be disconnected, so that the insulation fault is avoided. In a word, intelligence high voltage direct current contactor has excellent excess temperature and insulating protect function, fine security when having ensured direct current contactor and using.

Drawings

Fig. 1 is a schematic structural diagram of the intelligent high-voltage direct-current contactor according to the present invention at a first viewing angle;

fig. 2 is a schematic structural diagram of the intelligent high-voltage direct-current contactor according to the present invention at a second viewing angle;

fig. 3 is a circuit diagram of the insulation detecting unit of the present invention.

The following description is made with reference to the accompanying drawings:

1-ceramic arc-extinguishing chamber; 2 — a main contact; 3-PCB board; 40-temperature collection point; 41-temperature sensor; 50-leakage current sensor.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and the present invention is not limited to the embodiments described in the present application.

It should be understood that the structures, ratios, sizes, etc. shown in the drawings attached to the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relation or adjustment of the size should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the function and the achievable purpose of the present invention.

Example 1:

please refer to fig. 1 and 2, which are schematic structural diagrams of the intelligent high-voltage dc contactor according to the present invention at two different viewing angles.

The utility model discloses an intelligent high voltage direct current contactor include ceramic explosion chamber 1, install in main contact 2 on ceramic explosion chamber 1, arrange in drive coil L outside ceramic explosion chamber 1 and can control PCB board 3 of drive coil work, very much, still be equipped with temperature detecting element and insulating detecting element, temperature detecting element has the temperature acquisition point 40 that can survey ceramic explosion chamber surface and inner chamber temperature information and can survey temperature sensor 41 of environmental temperature information around the ceramic explosion chamber, and temperature acquisition point 40 with temperature sensor 41 equally divide respectively electric connection in PCB board 3; the insulation detection unit is electrically connected between the main contact 2 and the driving coil L so as to detect leakage current between the main contact 2 and the driving coil, and meanwhile, the insulation detection unit is also electrically connected to the PCB 3; the PCB 3 correspondingly controls the drive coil L to be connected or disconnected with an external power supply according to the received temperature information and the received leakage current information, namely, the suction or disconnection work of the direct current contactor is controlled.

Intelligence high voltage direct current contactor passes through institutional advancement, has add one and has surveyed the temperature detecting element and one of ceramic explosion chamber surface and inner chamber and surrounding environment temperature information can detect the main contact with the insulating detecting element of the leakage current between the drive coil, just the temperature detecting element with insulating detecting element still all electricity connect in the PCB board to realize: when the temperature information received by the PCB exceeds a set value, the PCB controls the driving coil to be disconnected with an external power supply, namely the direct current contactor is controlled to be disconnected, and the direct current contactor is prevented from generating safety risk due to continuous temperature rise; and when the leakage current value received by the PCB exceeds a set value, the insulation resistance value between the high-voltage loop and the low-voltage loop is reduced, and the PCB controls the driving coil to be disconnected from an external power supply, namely the direct current contactor is controlled to be disconnected, so that the insulation fault is avoided.

In the present embodiment, preferably, the temperature collection point 40 is a metalized soldering point formed on the ceramic arc-extinguishing chamber 1; and the plurality of temperature acquisition points 40 are respectively arranged at different positions of the ceramic arc-extinguishing chamber 1 so as to realize the detection of a plurality of position points on the surface and the inner cavity of the ceramic arc-extinguishing chamber.

Preferably, the temperature sensors 41 are two (practical application is not limited to two), and the two temperature sensors 41 are oppositely mounted on the outer wall of the ceramic arc-extinguishing chamber 1.

Further preferably, two magnetic conductive brackets which are arranged oppositely are positioned on the outer wall of the top wall of the ceramic arc-extinguishing chamber 1, and the two temperature sensors 41 are respectively installed on the two magnetic conductive brackets.

Supplementary explanation: the installation mode of the temperature sensor is not limited to the above scheme, and other installation modes can be adopted, such as: mounting the temperature sensor on the inner wall of the shell of the intelligent high-voltage direct-current contactor, and the like; this is a technical solution that can be easily conceived by those skilled in the art, and therefore, a detailed description thereof is omitted here.

In this embodiment, preferably, the insulation detecting unit has a detecting switch S, a detecting resistor R and a leakage current sensor 50, and specifically, refer to fig. 3, wherein one end of the detecting switch S is connected in series with the detecting resistor R and then electrically connected to the main contact 2, the other end of the detecting switch S is connected in series with the leakage current sensor 50 and then electrically connected to two ends of the driving coil L (specifically, two measurement input interfaces of the leakage current sensor 50 are electrically connected to two ends of the driving coil L, respectively), and a data output interface of the leakage current sensor 50 is electrically connected to the PCB board 3.

In this embodiment, preferably, the PCB 3 is further electrically connected to an external alarm device.

To sum up, intelligent high voltage direct current contactor's novel structure, reasonable has excellent excess temperature and insulating protect function, fine security when having ensured direct current contactor and using.

The above description is only a preferred embodiment of the present invention, but not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as within the protection scope of the present invention.

Claims

1. The utility model provides an intelligence high voltage direct current contactor with excess temperature and insulation protection function, includes ceramic explosion chamber (1), install in main contact (2) on ceramic explosion chamber (1), arrange in ceramic explosion chamber (1) outer drive coil and can control PCB board (3) of drive coil work, its characterized in that: the temperature detection unit is provided with a temperature acquisition point (40) capable of detecting temperature information of the surface and the inner cavity of the ceramic arc-extinguishing chamber and a temperature sensor (41) capable of detecting temperature information of the surrounding environment of the ceramic arc-extinguishing chamber, and the temperature acquisition point (40) and the temperature sensor (41) are respectively and electrically connected to the PCB (3); the insulation detection unit is electrically connected between the main contact (2) and the driving coil so as to detect leakage current between the main contact (2) and the driving coil, and meanwhile, the insulation detection unit is also electrically connected to the PCB (3);

the PCB (3) correspondingly controls the driving coil to be connected or disconnected with an external power supply according to the received temperature information and the received leakage current information.

2. The intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions according to claim 1, is characterized in that: the temperature collection point (40) is a metalized welding point formed on the ceramic arc-extinguishing chamber (1);

and the plurality of temperature acquisition points (40) are respectively arranged at different positions of the ceramic arc-extinguishing chamber (1).

3. The intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions according to claim 1, is characterized in that: the temperature sensors (41) are two, and the two temperature sensors (41) are oppositely arranged on the outer wall of the ceramic arc-extinguishing chamber (1).

4. The intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions according to claim 3, wherein: two magnetic conduction supports which are oppositely arranged are positioned on the outer wall of the top wall of the ceramic arc-extinguishing chamber (1), and the two temperature sensors (41) are respectively arranged on the two magnetic conduction supports.

5. The intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions according to claim 1, is characterized in that: the insulation detection unit is provided with a detection switch (S), a detection resistor (R) and a leakage current sensor (50), wherein one end of the detection switch (S) is electrically connected to the main contact (2) after being connected in series with the detection resistor (R), the other end of the detection switch (S) is electrically connected to two ends of the driving coil (L) after being connected in series with the leakage current sensor (50), and a data output interface of the leakage current sensor (50) is electrically connected with the PCB (3).

6. The intelligent high-voltage direct-current contactor with over-temperature and insulation protection functions according to claim 1, is characterized in that: the PCB (3) is also electrically connected to an external alarm device.