CN211016924U

CN211016924U - Self-defined intelligent contactor

Info

Publication number: CN211016924U
Application number: CN201922295708.5U
Authority: CN
Inventors: 施宁; 施宇翔; 许广妹
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-07-14
Anticipated expiration: 2029-12-19

Abstract

The utility model discloses a self-defined intelligent contactor, include: the contactor comprises a contactor shell and a control and display panel, wherein the control and display panel is fixed on the surface of the contactor shell, a contactor circuit is packaged in the contactor shell and comprises a power supply controlled by the control and display panel and R-phase, S-phase and T-phase three-phase circuits, each phase circuit comprises a group of resistance-capacitance absorption circuits and a pair of IGBT transistors or VMOS power tubes which are reversely connected in parallel, the IGBT transistors or the VMOS power tubes are also connected with a capacitor and a pulse transformer, and the pulse transformer is electrically connected with the control and display panel; the R-phase, S-phase and T-phase three-phase circuits respectively comprise current sampling resistors FR1, FR2 and FR 3. The utility model is convenient to use and install and can be widely used in various occasions; the use function can be customized according to actual needs, and different functions can be realized by programming a specific control program.

Description

Self-defined intelligent contactor

Technical Field

The utility model belongs to the electrical equipment field relates to the contactor, especially relates to a self-defined intelligent contactor.

Background

The contactor is one of the most commonly used electrical equipment control devices, and the functions in the circuit are as follows: the voltage signal sent by the control loop is received, and the main power supply of the electrical equipment is switched on or off so as to achieve the purpose of controlling the operation of the equipment. The existing traditional contactor has a plurality of defects which are difficult to overcome, and the defects are mainly represented as follows: (1) the contact made of metal (the contact made of gold and silver materials is expensive) is easy to generate oxidation rust in the air, reduces the conductivity of the contact and is more serious especially under severe weather conditions; (2) in the using process, electric sparks can be generated, so that the surface of the contact is easy to ablate, poor contact is caused, electrical equipment and devices are damaged, and the device can not be used in occasions with flammable and explosive dangers; (3) the contactor needs to consume certain energy in the working process, and the alternating current contactor can also accompany with suction noise with the same frequency along with working noise, sometimes the alternating current contactor has loud sound (an electromagnet), and the alternating current contactor is not an energy-saving product; (4) because the traditional contactor is a mechanical structure product which works by depending on an electromagnet, the use of the traditional contactor in high-speed on-off occasions and severe motion occasions is limited; (5) the mechanical structure is complicated, the volume is large, the mass is large, the service life is short, and the damage rate is high.

In addition, because the contactor is only an electrical device responsible for switching on and off the main power supply and does not have any circuit protection function, the contactor also needs to be used together with other electrical devices with the circuit protection function in actual use to complete control and protection of electrical equipment. For example, the circuit breaker is matched with a circuit breaker to complete control and protection of various power supply circuits; the motor control circuit is matched with a circuit breaker and a thermal relay to complete control and protection of various motors; the motor is matched with a circuit breaker, various starters (such as a frequency converter, a soft starter and various voltage reduction starters) and a thermal relay to complete the starting, speed regulation and control and protection of the motor in the running direction; for another example, the motor can be operated in forward and reverse directions, star delta starting, high and low speed operation conversion, etc. by matching with a circuit breaker, a thermal relay and other contactors.

In summary, three basic conclusions can be drawn: the traditional contactor (electromagnetic type) is an electric device with wide application; secondly, the traditional contactor (electromagnetic type) has the defect which cannot be overcome structurally; and thirdly, the traditional contactor (electromagnetic contactor) has no protection function, must be matched with other electrical devices for use, is complex to use, and particularly consumes a large amount of working hours and materials in the production and assembly processes of various electrical control cabinets, thereby causing great waste of social resources.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a self-defined intelligent contactor remedies the technical defect of traditional contactor and uses inconveniently, can be according to the function of the self-defined intelligent contactor of actual demand.

In order to achieve the above object, the utility model adopts the following technical scheme:

a custom smart contactor comprising: the contactor comprises a contactor shell and a control and display panel, wherein the control and display panel is fixed on the surface of the contactor shell, a contactor circuit is packaged in the contactor shell and comprises a power supply controlled by the control and display panel and R-phase, S-phase and T-phase three-phase circuits, each phase circuit comprises a group of resistance-capacitance absorption circuits and a pair of IGBT transistors or VMOS power tubes which are reversely connected in parallel, the IGBT transistors or the VMOS power tubes are also connected with a capacitor and a pulse transformer, and the pulse transformer is electrically connected with the control and display panel; the R-phase, S-phase and T-phase three-phase circuits respectively comprise current sampling resistors FR1, FR2 and FR 3.

This technical scheme has realized acting as traditional contactor contact with a pair of reverse parallelly connected IGBT transistor or VMOS power tube and a set of resistance-capacitance absorption circuit to can realize different control function according to the customized specific control program of establishment of actual demand, can realize by control and display panel control output's PWM pulse signal, intelligent contactor can regard as traditional contactor, the contactor of taking soft start function, voltage, current regulation formula contactor, the contactor of taking earth leakage protection function, the contactor of taking default phase protect function, the intelligent contactor of taking various electrical parameter display records and network communication function etc..

Preferably, the control and display panel includes a control interface for accessing a power supply voltage and a communication interface for network bus communication and control.

More preferably, the communication interface issues commands to the control and display panel and reads electrical parameters of the contactor circuit by means of 485 protocol or can bus protocol.

More preferably, the control and display panel further includes a pulse width modulation IC for generating PWM pulses to control the output of the power supply voltage.

Preferably, the control and display panel includes a display screen for displaying the power supply voltage and the electrical parameters sampled by the current sampling resistor in the contactor circuit.

The optimization effect that this optimization scheme brought is that control and display panel can all carry out the sampling to electric current, voltage in the contactor circuit to transmit for the display screen through data processing, convenient electric parameter in showing the contactor circuit.

Preferably, the contactor circuit further comprises auxiliary contacts for self-locking or interlocking.

Compared with the prior art, the beneficial effects of the utility model are that:

1. a self-defined intelligent contactor use simple to operate, and need not like all like products that can see on the existing market, dispose other heat abstractor such as fin, ventilation blower in addition.

2. A self-defined intelligent contactor belong to a totally enclosed, solid-state electron class product, it can extensively be used for various power supply and distribution circuit of various electrical system, various electrical equipment's control and protection occasion. There is also a larger application space compared to conventional contactors, for example: can be directly soaked in various non-corrosive liquids for work, such as water; can be used for high-speed sports and severe bumpy fields, such as airplanes, ships, high-speed rails and various engineering machines; because no electric spark is generated during the work of the intelligent contactor, the intelligent contactor can be applied to various occasions needing explosion prevention, flammability and explosiveness.

3. A self-defined intelligent contactor be the same with traditional contactor, directly adopt mains voltage to start and stop control to it. All the similar products available in the market at present are inconvenient to use because a control power supply (for example, some products need to provide a control voltage of DC3.5V-32V) must be additionally arranged.

4. A self-defined intelligent contactor has kept the auxiliary contact of traditional contactor for auto-lock or interlocking, this point is that all like products that can see on the existing market do not possess.

5. A self-defined intelligent contactor possess and show the function, convenient demonstration electrical parameter in the contactor circuit, this point is that all like products that can see on the existing market do not possess.

6. A control pole of self-defined intelligent contactor's IGBT transistor or VMOS power tube adopt pulse transformer and electric capacity to carry out electrical isolation with control and display panel and major loop respectively, carry out electrical isolation with control and display panel and main circuit, prevent the high tension electricity admission control and the display panel of main circuit to ensure semiconductor device's safe work. Meanwhile, the PMW pulse control signal can be coupled to the control electrode of the IGBT transistor, and the IGBT transistor is synchronously conducted according to the width of the pulse.

7. A self-defined intelligent contactor area data bus communication control function, can realize different control function according to the self-defined specific control program of establishment of actual demand, can realize by the PWM pulse signal of control and display panel control output, traditional contactor can be regarded as to intelligent contactor, takes the contactor of soft start function, voltage, current regulation formula contactor take earth leakage protection function, takes default phase protect function's contactor, takes various electrical parameter to show intelligent contactor etc. of record and network communication function.

Drawings

Fig. 1 is an electrical schematic diagram of a custom intelligent contactor according to the present invention.

Fig. 2 is an electrical schematic diagram of the intelligent contactor according to the present invention when a single motor is directly started.

Fig. 3 is an electrical schematic diagram of a conventional contactor used in a direct start operation of a single motor.

Fig. 4 is an electrical schematic diagram of the intelligent contactor according to the present invention when a single motor star-delta is started.

Fig. 5 is an electrical schematic diagram of a conventional contactor used in star-delta starting operation of a single motor.

Wherein, 1, a control and display panel; 2. a control interface; 3. a communication interface; 4. an auxiliary contact; 5. an intelligent contactor; 6. a conventional contactor.

Detailed Description

For a better understanding of the present invention, the contents of the present invention will be further clarified below with reference to the accompanying drawings and examples, but the present invention is not limited to the following examples.

Examples

As shown in fig. 1, a custom smart contactor includes: the contactor comprises a contactor shell and a control and display panel 1, wherein the control and display panel 1 is fixed on the surface of the contactor shell, a contactor circuit is packaged in the contactor shell and comprises a power supply controlled by the control and display panel 1 and R-phase, S-phase and T-phase three-phase circuits, each phase circuit comprises a group of resistance-capacitance absorption circuits and a pair of IGBT transistors or VMOS power tubes which are reversely connected in parallel, the IGBT transistors or the VMOS power tubes are also connected with a capacitor and a pulse transformer, and the pulse transformer is electrically connected with the control and display panel 1; the R-phase, S-phase and T-phase three-phase circuits respectively further comprise current sampling resistors FR1, FR2 and FR 3. The contactor circuit also comprises auxiliary contacts 4 for self-locking or interlocking. In the embodiment, an IGBT transistor is selected and denoted by an IGBT in the drawing, wherein CK denotes a capacitor, FR denotes a current sampling resistor, and T denotes a pulse transformer.

The control and display panel 1 comprises a control interface 2 for accessing power supply voltage and a communication interface 3 for network bus communication and control, and the communication interface 3 sends instructions to the control and display panel 1 and reads electrical parameters of the contactor circuit through 485 protocol or can bus protocol. The control and display panel 1 further includes a pulse width modulation IC for generating PWM pulses to control the output of the power supply voltage. The control and display panel 1 further comprises a display screen for displaying the power supply voltage and the electrical parameters sampled by the current sampling resistor in the contactor circuit.

Intelligent contactor service function can realize according to the customized specific control program of establishment of actual demand, can realize by the PWM pulse signal of control and display panel 1 control output. The intelligent contactor described in this embodiment can be used as a traditional contactor, a contactor with a soft start function, a voltage and current regulation type contactor, a contactor with an electric leakage protection function, a contactor with a phase loss protection function, a contactor with various electrical parameter display records, a network communication and control function and the like.

For example, when the intelligent contactor described in this embodiment is used as a contactor with a soft start function, since the control electrode of the IGBT transistor adopts a Pulse Width Modulation (PWM) control method, the output voltage at the outlet terminal of the intelligent contactor can be conveniently changed by controlling the duty ratio of the modulated pulse. When the control and display panel 1 sends a switch-on instruction, the control and display panel 1 sends modulation pulses with narrow duty ratio to the control electrode of the IGBT according to a preset program, so that the output voltage of the outlet end of the intelligent contactor is 30% of the rated voltage of the power supply, then the duty ratio of the modulation pulses is gradually widened, the maximum is reached after 3-10 seconds, at the moment, the output voltage of the outlet end of the intelligent contactor is 100% of the rated voltage of the power supply, the whole soft start process is finished, and the full-voltage operation mode is switched to.

When the intelligent contactor described in this embodiment is used as a contactor with a phase-loss protection function, after the intelligent contactor is turned on, three corresponding voltage signals will appear on three current sampling resistors FR1, FR2 and FR3, which respectively represent phase currents of an R phase, an S phase and a T phase, and when the control and display panel 1 detects that there is no voltage on a certain resistor, or the voltage is much smaller than the voltages on other resistors, the control and display panel 1 considers that the electrical equipment is in a phase-loss operation state, immediately sends an instruction to close the pulse output of PWM, and the intelligent contactor is turned off, thereby protecting the electrical equipment from being damaged.

When the intelligent contactor described in this embodiment is used as a contactor with various electrical parameter display records and network communication functions, because the current and voltage in the circuit of the contactor are sampled by the control and display panel 1, and the sampled current and voltage are transmitted to the display screen through data processing, the intelligent contactor can conveniently display the following parameters: the electric parameters such as current (ampere), voltage (volt), power (kilowatt) and electric energy (kilowatt-hour) can be transmitted through a data bus, and start-stop instructions sent by a centralized control system can also be received.

As shown in fig. 2 and 3, according to the comparison between the intelligent contactor 5 and the conventional contactor 6, it can be seen that the more complicated the control requirement of the motor, the more the advantages of the intelligent contactor 5 of the present invention can be embodied.

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.

Claims

1. A custom smart contactor, comprising: the contactor comprises a contactor shell and a control and display panel, wherein the control and display panel is fixed on the surface of the contactor shell, a contactor circuit is packaged in the contactor shell and comprises a power supply controlled by the control and display panel and R-phase, S-phase and T-phase three-phase circuits, each phase circuit comprises a group of resistance-capacitance absorption circuits and a pair of IGBT transistors or VMOS power tubes which are reversely connected in parallel, the IGBT transistors or the VMOS power tubes are also connected with a capacitor and a pulse transformer, and the pulse transformer is electrically connected with the control and display panel; the R-phase, S-phase and T-phase three-phase circuits respectively comprise current sampling resistors FR1, FR2 and FR 3.

2. The custom smart contactor as claimed in claim 1, wherein said control and display panel comprises a control interface for accessing a power supply voltage and a communication interface for network bus communication and control.

3. A custom smart contactor according to claim 2, wherein said communication interface issues commands to said control and display panel and reads electrical parameters of said contactor circuit via 485 protocol or can bus protocol.

4. The custom smart contactor as claimed in claim 2, wherein said control and display panel further comprises a pulse width modulation IC for generating PWM pulses to control the output of said power supply voltage.

5. The custom smart contactor as recited in claim 1, wherein said control and display panel includes a display screen for displaying the power supply voltage and the electrical parameters sampled by said current sampling resistor in said contactor circuit.

6. The custom smart contactor as claimed in claim 1, wherein said contactor circuit further comprises auxiliary contacts for self-locking or interlocking.