阅读说明：本技术 一种具有智能保护功能的直流接触器 (Direct current contactor with intelligent protection function ) 是由 孙志强 于 2021-01-29 设计创作，主要内容包括：本发明公开了一种具有智能保护功能的直流接触器,包括壳体,壳体内设有触点单元和电磁驱动单元,所述电磁驱动单元和线圈电压输入端连接,所述壳体内还设有触点电流检测控制单元和电流过载跳闸保护设置单元。本发明,利用触点电流检测传感模块,完成对触点所通过电流状态的检测采样,并反馈给MCU模块,MCU模块通过与电流过载跳闸保护设置单元预设的跳闸电流值进行比对,判断是否启动跳闸保护,并通过远程通信模块给出报警信息,实现直流接触器的自我保护,有效降低故障率,确保系统安全。(The invention discloses a direct current contactor with an intelligent protection function, which comprises a shell, wherein a contact unit and an electromagnetic driving unit are arranged in the shell, the electromagnetic driving unit is connected with a coil voltage input end, and a contact current detection control unit and a current overload trip protection setting unit are also arranged in the shell. According to the invention, the detection sampling of the current state passing through the contact is completed by utilizing the contact current detection sensing module and is fed back to the MCU module, the MCU module judges whether to start the trip protection or not by comparing with the trip current value preset by the current overload trip protection setting unit, and alarm information is given out by the remote communication module, so that the self-protection of the direct current contactor is realized, the fault rate is effectively reduced, and the system safety is ensured.)

1. The utility model provides a direct current contactor with intelligence protect function, includes the casing, is equipped with contact unit and electromagnetic drive unit in the casing, electromagnetic drive unit and coil voltage input end connect its characterized in that: and a contact current detection control unit and a current overload tripping protection setting unit are also arranged in the shell.

2. The direct current contactor with the intelligent protection function according to claim 1, wherein: the contact current detection control unit comprises a contact current detection sensing module, an MCU module, an MOS tube switch circuit, a remote communication module and a voltage stabilizing module, the contact current detection sensing module is connected with an input interface of the MCU module, an output interface of the MCU module is connected with a coil of a contactor through the MOS tube switch circuit, the MCU module is further connected with the remote communication module and a current overload trip protection setting unit respectively, the voltage stabilizing module is connected with a voltage input end of the coil, and the voltage stabilizing module outputs stable voltage to the contact current detection sensing module, the MCU module, the MOS tube switch circuit and the remote communication module.

3. The direct current contactor with the intelligent protection function according to claim 1, wherein: the current overload trip protection setting unit comprises a display module and a data input module.

4. The direct current contactor with the intelligent protection function according to claim 1, wherein: the current value preset by the current overload trip protection setting unit can also be set by an upper computer through the remote communication module.

5. The direct current contactor with intelligent protection function according to claim 3, characterized in that: the display module is used for displaying the identification of the dial switch or displaying the identification of the liquid crystal display.

6. The direct current contactor with intelligent protection function according to claim 3, characterized in that: the data input module is set by a dial switch or a key switch.

7. The direct current contactor with intelligent protection function according to claim 2, characterized in that: the remote communication module adopts a CAN bus module.

Technical Field

The invention relates to the technical field of direct current contactors, in particular to a direct current contactor with an intelligent protection function.

Background

In recent years, with the development of the low-voltage electrical appliance industry, the introduction and application of new energy, new technology, energy-saving and environment-friendly concepts are proposed and applied, as one of main control electrical appliances, a direct current contactor is widely applied in the fields of industrial automation, remote control, engineering machinery, new energy automobiles and the like, the requirements on the reliability, the intelligent self-protection and the like of the direct current contactor are higher and higher, and the direct current contactor is directly related to the stability and the safety of application systems.

At present, a direct current contactor mainly comprises a contact assembly and an electromagnet assembly, wherein the contact assembly pushes an armature to move by means of a magnetic field generated by the on-off of the electromagnet assembly, and then pushes a contact to be switched on and off. The current load passed by the contact assembly is overloaded, and the product does not have the current sensing function. Therefore, the product is easily burnt out when being overloaded by a large current, and the product is broken or the contact bonding is failed.

In the prior art, the direct current contactor generally only has a contact on-off function or an alarm function after contacts are adhered; for example, document CN107015142 "an intelligent high voltage dc contactor" discloses a contactor suitable for dc power supply, which only has the functions of detecting contact adhesion and alarming, but does not have the functions of detecting contact current and presetting trip protection.

Disclosure of Invention

The present invention is directed to a dc contactor with intelligent protection function, so as to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a direct current contactor with intelligence protect function, includes the casing, is equipped with contact unit and electromagnetic drive unit in the casing, electromagnetic drive unit and coil voltage input end are connected, still be equipped with contact current detection control unit and current overload tripping operation protection in the casing and set up the unit.

Preferably, the contact current detection control unit comprises a contact current detection sensing module, an MCU module, an MOS tube switching circuit, a remote communication module and a voltage stabilizing module, the contact current detection sensing module is connected with an input interface of the MCU module, an output interface of the MCU module is connected with a coil of the contactor through the MOS tube switching circuit, the MCU module is also connected with the remote communication module and a current overload trip protection setting unit respectively, and the voltage stabilizing module is connected with a voltage input end of the coil.

Preferably, the current overload trip protection setting unit comprises a display module and a data input module.

Preferably, the current value preset by the current overload trip protection setting unit may also be set by an upper computer through the remote communication module.

Preferably, the display module is a dial switch identifier display or a liquid crystal display.

Preferably, the data input module is set by a dial switch or a key switch.

Preferably, the remote communication module adopts a CAN bus module.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the detection sampling of the current state passing through the contact is completed by utilizing the contact current detection sensing module and is fed back to the MCU module, the MCU module judges whether to start the trip protection or not by comparing with the trip current value preset by the current overload trip protection setting unit, and alarm information is given out by the remote communication module, so that the self-protection of the direct current contactor is realized, the fault rate is effectively reduced, and the system safety is ensured.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the circuit principle of the present invention.

In the figure: 1. a housing; 2. an electromagnetic drive unit; 3. a contact current detection control unit; 4. a contact unit; 5. and a current overload trip protection setting unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-2, the present invention provides a technical solution: a direct current contactor with an intelligent protection function comprises a shell 1, wherein a contact unit 4 and an electromagnetic driving unit 2 are arranged in the shell 1, and the electromagnetic driving unit mainly comprises an electromagnetic coil, an armature, a core rod, a counter-force spring and the like; and a contact current detection control unit 3 and a current overload trip protection setting unit 5 are also arranged in the shell. The contact current detection control unit 3 comprises an MCU module U1, a contact current detection sensing module U3, an MOS tube switching circuit U4, a remote communication module U2 and a voltage stabilizing module U5; the current overload trip protection setting unit 5 comprises a display module and a data input module, a contact current detection sensing module U3 mainly comprises a Hall element, a half-open magnetic ring and an operational amplifier, a remote communication module U2 comprises a single chip microcomputer with a CAN controller and a CAN transceiver, and a voltage stabilizing module U5 comprises electronic components such as a three-terminal regulator, a diode, a resistor, a capacitor and the like.

The coil voltage input end of the contactor is connected to the coil U6 of the electromagnetic driving unit 2 of the contactor and the input end of the voltage stabilizing module U5, and the voltage stabilizing module U5 outputs stable 5V voltage to the contact current detection sensing module, the MCU module, the MOS tube switching circuit and the remote communication module; an input interface of the MCU module U1 is connected with the contact current detection sensing module U3, and an input interface of the MCU module U1 is connected with the current overload trip protection setting unit 5; the output interface of the MCU module U1 is connected with the MOS tube switch circuit U4; the MCU module U1 is connected with the remote communication module U2; the MOS transistor switch circuit U4 is connected to the coil U6 of the electromagnetic drive unit 2.

After the contactor coil is connected with the working power supply, the electromagnetic driving unit 2 drives the contact unit 4 to complete contact connection and closing. The contact current detection sensing module U3 transmits detected contact current data to the MCU module U1, the MCU module U1 processes and compares the obtained data with data preset by the current overload trip protection setting unit 5 or trip current set by an upper computer through a remote communication module, when the contact current exceeds the preset trip protection current, the MCU module U1 outputs high level to the MOS tube switch circuit U4, the MOS tube switch circuit U4 cuts off the current of a coil U6 of the electromagnetic driving unit 2, so that the contacts of the contactor are disconnected, and the contacts are protected from being burnt or adhered due to overcurrent; meanwhile, the MCU module U1 sends an alarm signal to the remote communication module U2, and the remote communication module U2 CAN adopt a CAN bus module which sends the alarm signal to an upper computer.

The current overload trip protection setting unit 5 comprises a display module and a data input module;

the display module can be displayed by the digital identification of the dial switch or a liquid crystal display screen;

the data input module can be set by a dial switch or a key switch.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.