CN218782973U - Contactor control device and control system - Google Patents
Contactor control device and control system Download PDFInfo
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- CN218782973U CN218782973U CN202222102931.5U CN202222102931U CN218782973U CN 218782973 U CN218782973 U CN 218782973U CN 202222102931 U CN202222102931 U CN 202222102931U CN 218782973 U CN218782973 U CN 218782973U
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Abstract
The utility model relates to a contactor technical field discloses a contactor control device and control system. The contactor control device includes: the system comprises a main control module, a driving module and a detection and protection module which are connected with each other; the driving module is connected with the contactor; the detection and protection module is used for detecting the three-phase voltage of the input contactor and sending the detection result to the main control module; the main control module is used for receiving the detection result sent by the detection and protection module and outputting a contactor trigger signal to the driving module according to the received contactor control instruction when the detection result meets the preset requirement; the driving module is used for processing the contactor trigger signal and transmitting the processed contactor trigger signal to the contactor when receiving the contactor trigger signal output by the main controller. The control of the contactor can be realized by replacing an electromagnetic relay, so that the reliability and the safety of the whole system can be improved, and the requirement of an actual application scene can be met.
Description
Technical Field
The utility model belongs to the technical field of the contactor technique and specifically relates to a contactor control device and control system are related to.
Background
At present, the distribution of electric power is completed by adopting a contactor in many scenes. The traditional contactor is mostly controlled by an electromagnetic relay. An electromagnetic relay is an electromagnetic electronic component generally composed of an iron core, a coil, an armature, a contact spring, and the like. The electromagnetic relay plays the roles of controlling the on-off of the circuit, converting the circuit and the like in the circuit. Electromagnetic relays are widely used due to advantages such as simple control.
However, since the interior of the electromagnetic relay is a conventional mechanical structure, it has significant problems of large volume, easy generation of mechanical damage, and the like. In actual use scenes, the service life is often short, and the reliability is low, so that the requirement of the scenes using the contactors is difficult to meet.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a contactor control device and control system for replace electromagnetic relay and realize the control to the contactor, thereby improve contactor control device's reliability and then promote the reliability including the overall system of contactor.
In order to achieve the above object, an embodiment of the present invention provides a contactor control device, including: the system comprises a main control module, a driving module and a detection and protection module which are connected with each other; the driving module is also connected with the contactor; the detection and protection module is used for detecting the three-phase voltage input into the contactor and sending the detection result to the main control module; the main control module is used for receiving the detection result sent by the detection and protection module and outputting a contactor trigger signal to the driving module according to a received contactor control instruction when the detection result meets a preset requirement; the driving module is used for processing the contactor trigger signal and transmitting the processed contactor trigger signal to the contactor when receiving the contactor trigger signal output by the main controller.
In order to achieve the above object, the present invention further provides a contactor control system, which includes a contactor and the contactor control device.
In an embodiment of the present invention, the contactor control device includes: the system comprises a main control module, a driving module and a detection and protection module which are connected with each other; the driving module is also connected with the contactor; the detection and protection module is used for detecting the three-phase voltage input into the contactor and sending the detection result to the main control module; the main control module is used for receiving the detection result sent by the detection and protection module and outputting a contactor trigger signal to the driving module according to a received contactor control instruction when the detection result meets a preset requirement; the driving module is used for processing the contactor trigger signal and transmitting the processed contactor trigger signal to the contactor when receiving the contactor trigger signal output by the main controller. In the utility model, the detection and protection module can detect the three-phase voltage of the input contactor; the main control module can output a contactor trigger signal according to a control instruction when the three-phase voltage meets a preset requirement, namely, the three-phase voltage input into the contactor can meet the requirement when the contactor is switched on; the driving module can process the contactor trigger signal output by the main controller into a signal capable of driving the contactor. The utility model provides a contactor control device can replace the electromagnetic relay who is used for controlling contactor among the traditional correlation technique, therefore can avoid electromagnetic relay easily to take place mechanical damage and the not enough problem of whole system reliability that leads to. The safety and reliability requirements of practical application scenes can be met.
In addition, the main control module is also used for receiving the result of the detection of the three-phase current sent by the detection and protection module and stopping outputting the contactor trigger signal when the sum of the three-phase current exceeds a preset range. When the sum of the three-phase currents exceeds the preset range, the imbalance of the three-phase power supply load reaches a certain degree, and the system is considered to be possibly broken down. At this moment, the main control module can stop outputting the contactor trigger signal, namely, automatically cutting off the work of the contactor, so that the effect of protecting the power supply and the load is achieved.
In addition, the detection and protection module also comprises a fast diode; the anode of the fast diode is connected with the junction of the drain electrode of the third field effect transistor and the first end of the coil of the contactor, and the cathode of the fast diode is connected with the junction of the power supply end and the second end of the coil of the contactor. The fast diode can suppress the back electromotive force of the contactor coil, thereby protecting the driving module in the contactor control device.
In addition, the detection and protection module also comprises a detection resistor and an operational amplifier; the first end of the detection resistor is connected with the source electrode of the third field effect transistor, and the second end of the detection resistor is grounded; the first input end of the operational amplifier is connected with the joint of the first end of the detection resistor and the source electrode of the third field effect transistor, the second input end of the operational amplifier is connected with the second end of the detection resistor, and the output end of the operational amplifier is connected with the joint of the grid electrode of the first field effect transistor and the grid electrode of the second field effect transistor. The voltage across the detection resistor increases when the coil of the contactor is shorted, and the operational amplifier amplifies the voltage across the detection resistor. In this case, the first fet and the second fet included in the driving module are turned off, and further, the third fet is turned off, and the contactor is opened. Therefore, the detection resistor and the operational amplifier can protect the coil of the contactor when the coil is short-circuited.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural view of a contactor control device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a contactor control system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The contactor is widely applied to the fields of aviation power generation and distribution systems, power system equipment, alternating current and direct current electrical equipment and the like. For example, contactors are often used in aircraft power distribution systems to distribute power. In addition, the control of the contactor is mainly realized by adopting an intermediate electromagnetic relay. However, the on-off of the electromagnetic relay requires a certain time, and the requirement of uninterrupted power supply of the aircraft is difficult to guarantee in a complex power distribution network. In addition, the electromagnetic relay has significant problems of short service life, low reliability and the like due to the structural characteristics thereof.
An embodiment of the utility model relates to a contactor control device.
In the present embodiment, the contactor control device includes: the system comprises a main control module, a driving module and a detection and protection module which are connected with each other; the driving module is also connected with the contactor; the detection and protection module is used for detecting the three-phase voltage input into the contactor and sending the detection result to the main control module; the main control module is used for receiving the detection result sent by the detection and protection module and outputting a contactor trigger signal to the driving module according to a received contactor control instruction when the detection result meets a preset requirement; the driving module is used for processing the contactor trigger signal and transmitting the processed contactor trigger signal to the contactor when receiving the contactor trigger signal output by the main controller.
The following describes the details of the implementation of the contactor control device in this embodiment, and the following is only for the convenience of understanding the details of the implementation of this embodiment and is not necessary for implementing this embodiment. The structure schematic diagram is shown in figure 1.
As shown in fig. 1, in this embodiment, the main control module may be specifically an MCU (Micro-controller Unit). OUT shown in fig. 1 is a contactor trigger signal output terminal of the main control module, through which the main control module sends a contactor trigger signal to the detection and protection module.
In addition, the preset requirements to be met when the main control unit sends the contactor trigger signal in the embodiment may specifically include that the amplitude of the three-phase voltage meets the preset working requirements, and the phase sequence of the three-phase voltage is correct. The detection and protection module detects the amplitude of the three-phase voltage by using a voltage sensor included in the detection and protection module, and detects the phase sequence of the three-phase voltage by using an isolation operational amplifier included in the detection and protection module. The isolation operational amplifier may refer to the "isolation operational amplifier" shown in fig. 1. It will be appreciated that the voltage sensor may be specifically deployed to the left of the isolated operational amplifier shown in fig. 1, in a position prior to the transmission of the three-phase voltage signals to the master control module. The three-phase voltages may be referred to as Va, vb, and Vc shown in fig. 1.
The isolated operational amplifier may also detect three-phase currents, as shown in fig. 1. In addition to timing, the isolation operational amplifier may also detect the phase of the three-phase voltages and currents. That is, the detection and protection module may also be configured to detect a three-phase current input to the contactor, and send a result of the detection to the main control module. The three-phase current input to the contactor may refer to ia, ib, and ic shown in fig. 1.
And under the condition that the detection and protection module detects the three-phase current input into the contactor, the main control module is also used for receiving the result of the detection of the three-phase current sent by the detection and protection module and stopping outputting the contactor trigger signal when the sum of the three-phase current exceeds a preset range.
During normal operation, the three-phase current vector should be zero, i.e., ia + ib + ic =0. When ia + ib + ic is not equal to 0 in the result of three-phase current detection, the situation that the three-phase power supply load is unbalanced or a short circuit occurs between the phase lines or between the phase lines and the ground is indicated. Therefore, when the sum of the three-phase currents is detected to exceed the preset range, the imbalance reaches a certain degree, and the system is considered to be possibly in fault at the moment. In this embodiment, the main control module can stop outputting the contactor trigger signal, that is, automatically cut off the contactor, so as to achieve the effect of protecting the power supply and the load.
It is worth mentioning that the exceeding of the preset range referred to herein may actually be the addition of three-phase currents deviating from 0 beyond the preset value, or reaching a preset ratio of the ideal value of any one of the phase currents.
In one example, the driving module for processing the trigger signal of the contactor may specifically include three field effect transistors connected to each other: the field effect transistor comprises a first field effect transistor, a second field effect transistor and a third field effect transistor. The first field effect transistor is a PMOS (P-channel metal oxide semiconductor) transistor, and the second field effect transistor and the third field effect transistor are NMOS (N-channel metal oxide semiconductor) transistors; the source electrode of the first field effect transistor is connected with the voltage output end of the main control module, the grid electrode of the first field effect transistor is grounded, and the drain electrode of the first field effect transistor is connected with the grid electrode of the third field effect transistor; the grid electrode of the second field effect tube is connected with the grid electrode of the first field effect tube, the source electrode of the second field effect tube is grounded, and the drain electrode of the second field effect tube is connected with the connection position of the drain electrode of the first field effect tube and the grid electrode of the third field effect tube; the grid electrode of the third field effect tube is connected with the drain electrode of the first field effect tube, the source electrode of the third field effect tube is grounded, and the drain electrode of the third field effect tube is connected with the first end of the coil of the contactor.
The first fet refers to Q1 shown in fig. 1, the second fet refers to Q2 shown in fig. 1, and the third fet refers to Q3 shown in fig. 1. From the viewpoint of the realized effect, the first field effect transistor and the second field effect transistor can be understood as signal-level field effect transistors, and the third field effect transistor can be understood as a high-power field effect transistor. Under the scene of normal work, the drive module receives the 5V high level that the host system sent, and first field effect transistor and third field effect transistor are all put through this moment, and the third field effect transistor provides the coil that electric current is used for driving contactor.
Several resistors connected to three fets may also be included in the driver module as shown in fig. 1. The resistor connected in parallel across the first fet is understood to be a protection resistor. The resistor connected in series between the first field effect transistor and the third field effect transistor and the resistor connected to the ground at the right side of the resistor can be understood as a driving resistor for controlling the on-off of the third field effect transistor. Since these resistors are not the focus of the present application, the technical details related thereto are not described herein.
It is also worth mentioning that the contactor is generally composed of two sets of coils, a start coil and a sustain coil. The starting current is typically a multiple of the holding current. For example, the starting current 11A of a certain type of aviation contactor is about 0.8A of the maintaining current. When the electromagnetic relay is used for controlling the contactor, large current impact is easily generated on the electromagnetic relay. Moreover, the coil of the contactor generates a large back-emf voltage during turn-off, resulting in device damage.
In order to suppress the back-emf and thus protect the devices in the circuit, in one example, the detection and protection module of this embodiment may further include a fast diode; the positive pole of the fast diode is connected with the joint of the drain electrode of the third field effect transistor and the first end of the coil of the contactor, and the negative pole of the fast diode is connected with the joint of the power supply end and the second end of the coil of the contactor.
The back-emf of the contactor coil can be suppressed with the fast diode according to the present example, so that the drive module in the contactor control device can be protected. It is understood that, in the case where the driving module includes a field effect transistor, the field effect transistor included in the driving module can be protected.
In one example, the detection and protection module may further include a detection resistor and an operational amplifier; the first end of the detection resistor is connected with the source electrode of the third field effect transistor, and the second end of the detection resistor is grounded; the first input end of the operational amplifier is connected with the joint of the first end of the detection resistor and the source electrode of the third field effect transistor, the second input end of the operational amplifier is connected with the second end of the detection resistor, and the output end of the operational amplifier is connected with the joint of the grid electrode of the first field effect transistor and the grid electrode of the second field effect transistor.
The voltage across the detection resistor provided in this example rises when the coil of the contactor is shorted, and the operational amplifier amplifies the voltage across the detection resistor. In this case, the first fet and the second fet are turned off, and the third fet is further turned off, and the contactor is opened. Therefore, the detection resistor and the operational amplifier provided by the embodiment can protect the coil when the coil of the contactor is short-circuited.
It is worth mentioning that the detection resistance can refer to R shown in fig. 1 S Generally, the resistance may be about 0.2 Ω. Operational amplifiers reference can be made to A1 shown in FIG. 1, through the pair of operational amplifiers V RS The proportion is enlarged to about 5V, and the purpose of stopping the field effect transistor and protecting the coil of the contactor can be realized.
In the present embodiment, the contactor control device includes: the system comprises a main control module, a driving module and a detection and protection module which are connected with each other; the driving module is also connected with the contactor; the detection and protection module is used for detecting the three-phase voltage input into the contactor and sending the detection result to the main control module; the main control module is used for receiving the detection result sent by the detection and protection module and outputting a contactor trigger signal to the driving module according to a received contactor control instruction when the detection result meets a preset requirement; the driving module is used for processing the contactor trigger signal and transmitting the processed contactor trigger signal to the contactor when receiving the contactor trigger signal output by the main controller. In the utility model, the detection and protection module can detect the three-phase voltage of the input contactor; the main control module can output a contactor trigger signal according to a control instruction when the three-phase voltage meets a preset requirement, namely, the three-phase voltage input into the contactor can meet the requirement when the contactor is switched on; the driving module can process the contactor trigger signal output by the main controller into a signal capable of driving the contactor. The utility model provides a contactor control device can replace the electromagnetic relay who is used for control contactor among the traditional correlation technique, therefore can avoid electromagnetic relay easily to take place mechanical damage and the not enough problem of whole system reliability that leads to. The safety and reliability requirements of practical application scenes can be met. In addition, the contactor control device provided by the embodiment can shorten the on-off time of the contactor, and has important significance for power supply of key loads in application scenes such as aviation power distribution and the like.
An embodiment of the present invention relates to a contactor control system, the schematic structural diagram is shown in fig. 2, and the contactor control system includes a contactor and the contactor control device as described in the foregoing embodiment.
The contactor control device included in the contactor control system provided in the present embodiment includes: the system comprises a main control module, a driving module and a detection and protection module which are connected with each other; the driving module is also connected with the contactor; the detection and protection module is used for detecting the three-phase voltage input into the contactor and sending the detection result to the main control module; the main control module is used for receiving the detection result sent by the detection and protection module and outputting a contactor trigger signal to the driving module according to a received contactor control instruction when the detection result meets a preset requirement; the driving module is used for processing the contactor trigger signal and transmitting the processed contactor trigger signal to the contactor when receiving the contactor trigger signal output by the main controller. In the utility model, the detection and protection module can detect the three-phase voltage of the input contactor; the main control module can output a contactor trigger signal according to a control instruction when the three-phase voltage meets a preset requirement, namely, the three-phase voltage input into the contactor can meet the requirement when the contactor is switched on; the driving module can process the contactor trigger signal output by the main controller into a signal capable of driving the contactor. The utility model provides a contactor control device can replace the electromagnetic relay who is used for controlling contactor among the traditional correlation technique, therefore can avoid electromagnetic relay easily to take place mechanical damage and the not enough problem of whole system reliability that leads to. The safety and reliability requirements of practical application scenes can be met.
It should be noted that, the modules involved in the above embodiments of the present invention are logic modules, and in practical applications, one logic unit may be one physical unit, may also be a part of one physical unit, and may also be implemented by a combination of a plurality of physical units. In addition, in order to highlight the innovative part of the present invention, a unit which is not so closely related to the solution of the technical problem proposed by the present invention is not introduced in the present embodiment, but it does not indicate that there are no other units in the present embodiment.
The above-described embodiments are provided to enable persons skilled in the art to make and use the invention, and modifications and variations can be made to the above-described embodiments by persons skilled in the art without departing from the inventive concept of the present application, so that the scope of the invention is not limited by the above-described embodiments, but should be accorded the widest scope of the inventive features set forth in the claims.
Claims (8)
1. A contactor control device, comprising: the system comprises a main control module, a driving module and a detection and protection module which are connected with each other; the driving module is also connected with the contactor;
the detection and protection module is used for detecting the three-phase voltage input into the contactor and sending the detection result to the main control module;
the main control module is used for receiving the detection result sent by the detection and protection module and outputting a contactor trigger signal to the driving module according to a received contactor control instruction when the detection result meets a preset requirement;
the driving module is used for processing the contactor trigger signal and transmitting the processed contactor trigger signal to the contactor when receiving the contactor trigger signal output by the main control module.
2. The contactor control device according to claim 1, wherein the detection and protection module is further configured to detect a three-phase current input to the contactor, and send a result of the detection to the main control module.
3. The contactor control device according to claim 2, wherein the main control module is further configured to receive a result of the detection of the three-phase current sent by the detection and protection module, and stop outputting the contactor trigger signal when the sum of the three-phase current exceeds a preset range.
4. The contactor control device of claim 1, wherein the drive module comprises: the field effect transistor comprises a first field effect transistor, a second field effect transistor and a third field effect transistor; the first field effect transistor is a PMOS (P-channel metal oxide semiconductor) transistor, and the second field effect transistor and the third field effect transistor are NMOS (N-channel metal oxide semiconductor) transistors;
the source electrode of the first field effect transistor is connected with the voltage output end of the main control module, the grid electrode of the first field effect transistor is grounded, and the drain electrode of the first field effect transistor is connected with the grid electrode of the third field effect transistor;
the grid electrode of the second field effect tube is connected with the grid electrode of the first field effect tube, the source electrode of the second field effect tube is grounded, and the drain electrode of the second field effect tube is connected with the connection position of the drain electrode of the first field effect tube and the grid electrode of the third field effect tube;
the grid electrode of the third field effect tube is connected with the drain electrode of the first field effect tube, the source electrode of the third field effect tube is grounded, and the drain electrode of the third field effect tube is connected with the first end of the coil of the contactor.
5. The contactor control device of claim 4, wherein the detection and protection module further comprises a fast diode;
the anode of the fast diode is connected with the junction of the drain electrode of the third field effect transistor and the first end of the coil of the contactor, and the cathode of the fast diode is connected with the junction of the power supply end and the second end of the coil of the contactor.
6. The contactor control device of claim 4, wherein the detection and protection module further comprises a detection resistor and an operational amplifier;
the first end of the detection resistor is connected with the source electrode of the third field effect transistor, and the second end of the detection resistor is grounded; the first input end of the operational amplifier is connected with the joint of the first end of the detection resistor and the source electrode of the third field effect transistor, the second input end of the operational amplifier is connected with the second end of the detection resistor, and the output end of the operational amplifier is connected with the joint of the grid electrode of the first field effect transistor and the grid electrode of the second field effect transistor.
7. The contactor control device according to any of claims 1 to 6, wherein the preset requirements comprise: the amplitude of the three-phase voltage meets the preset working requirement, and the phase sequence of the three-phase voltage is correct;
the detection and protection module includes: a voltage sensor and an isolated operational amplifier; the voltage sensor is used for detecting the amplitude of the three-phase voltage, and the isolation operational amplifier is used for detecting the phase sequence of the three-phase voltage.
8. A contactor control system comprising a contactor and a contactor control device as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222102931.5U CN218782973U (en) | 2022-08-10 | 2022-08-10 | Contactor control device and control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222102931.5U CN218782973U (en) | 2022-08-10 | 2022-08-10 | Contactor control device and control system |
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| CN218782973U true CN218782973U (en) | 2023-03-31 |
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| CN202222102931.5U Active CN218782973U (en) | 2022-08-10 | 2022-08-10 | Contactor control device and control system |
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