CN112834917A - Relay state detection device and relay state detection method - Google Patents
Relay state detection device and relay state detection method Download PDFInfo
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Abstract
The invention provides a state detection device and a state detection method of a relay, wherein the device comprises: the power line carrier communication units are respectively arranged on two sides of the relay and are used for acquiring the power spectral density of a power line carrier signal on a power line where the relay is located; and the controller is used for judging the state of the relay according to the power spectral density of the power line carrier signal where the relay is located. The device can carry out the control of the power spectral density of the power line carrier signal on the power line at relay place in real time, both can real time monitoring relay state, can realize the relay adhesion detection fast under the circumstances that does not need other relay cooperations again, can all carry out the quick response to improper switching on and switching off, the online diagnostic ability of main power circuit is got into high voltage circuit with high frequency signal through the mode of coupling, carry out high pressure isolation easily, conveniently arrange, easy modularization.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a state detection device and a state detection method of a relay.
Background
In some high-power supply systems, when the relay drives different loads, in the instant of the attraction and disconnection of the relay contact, the current which is several times or even larger under the rated working condition can be generated, and the overlarge current causes the relay contact to generate electric arcs, adhesion and other conditions in the instant. Even if the control circuit of the contactor is powered off under the condition, the main contact of the contactor cannot be disconnected, and great potential safety hazards are brought to downstream equipment and workers.
At present, the method for detecting the adhesion of the relay mainly judges whether the relay is effectively disconnected or not by comparing the voltages at two ends of the relay after the relay is disconnected. However, the detection mode generally needs other relays in the circuit to work in a matching mode, the reliable detection needs overlong discharge time, the detection efficiency is not high, and certain difficulty also exists in fault location when the other relays in the same circuit are adhered.
Disclosure of Invention
The invention aims to solve the technical problems and provides a state detection device of a relay, which can monitor the power spectral density of a power line carrier signal on a power line where the relay is positioned in real time, can monitor the state of the relay in real time, can quickly realize relay adhesion detection under the condition that other relays are not matched, can quickly react on and off abnormal conditions, enhances the online diagnosis capability of equipment on a main power circuit, enables a high-frequency signal to enter a high-voltage circuit in a coupling mode, is easy to perform high-voltage isolation, is convenient to arrange and is easy to modularize.
The invention also provides a state detection method of the relay.
The technical scheme adopted by the invention is as follows:
an embodiment of a first aspect of the present invention provides a state detection apparatus for a relay, including: the power line carrier communication units are respectively arranged on two sides of the relay and are used for acquiring the power spectral density of a power line carrier signal on a power line where the relay is located; and the controller is used for judging the state of the relay according to the power spectral density of the power line carrier signal where the relay is located.
According to an embodiment of the present invention, the power line carrier communication unit includes: the coupling capacitor is used for coupling power line carrier signals on a power line where the relay is located; a primary coil of the coupling transformer is connected to a power line where the relay is located through a coupling capacitor, one secondary coil of the coupling transformer serves as a transmitting end, and the other secondary coil of the coupling transformer serves as a receiving end; a demodulator to demodulate a power spectral density of a received power line carrier signal on the power line.
According to an embodiment of the invention, the controller is specifically configured to: acquiring a standard state of the relay and a power spectral density of a power line carrier signal where the relay is located; and if the standard state of the relay is off and the power spectral density of the power line carrier signal where the relay is located is in the power spectral density interval when the relay is not reliably off or in the power spectral density interval when the relay is on, judging that the relay is adhered.
According to one embodiment of the invention, the relay comprises two, the device further comprising: and the controller is also used for respectively acquiring the power spectral density of power line carrier signals between every two power line carrier communication units so as to perform relay adhesion positioning.
The embodiment of the second aspect of the invention provides a state detection method of a relay, which comprises the following steps: arranging power line carrier communication units on two sides of the relay so as to obtain the power spectral density of a power line carrier signal on a power line where the relay is located through the power line carrier communication units; and judging the state of the relay according to the power spectral density of the power line carrier signal where the relay is located.
According to an embodiment of the present invention, the power line carrier communication unit includes: the coupling capacitor is used for coupling power line carrier signals on a power line where the relay is located; a primary coil of the coupling transformer is connected to a power line where the relay is located through a coupling capacitor, one secondary coil of the coupling transformer serves as a transmitting end, and the other secondary coil of the coupling transformer serves as a receiving end; a demodulator to demodulate a power spectral density of a received power line carrier signal on the power line.
According to an embodiment of the present invention, determining the state of the relay according to the power spectral density of the power line carrier signal where the relay is located includes: acquiring a standard state of the relay and a power spectral density of a power line carrier signal where the relay is located; and if the standard state of the relay is off and the power spectral density of the power line carrier signal where the relay is located is in the power spectral density interval when the relay is not reliably off or in the power spectral density interval when the relay is on, judging that the relay is adhered.
According to one embodiment of the invention, the relay comprises two, the method further comprises: a third power line carrier communication unit is arranged between the two relays, and each power line carrier communication unit is networked; and respectively acquiring the power spectral density of the power line carrier signals between every two power line carrier communication units so as to perform relay adhesion positioning.
The invention has the beneficial effects that:
the invention can monitor the power spectral density of the power line carrier signal on the power line where the relay is positioned in real time, can monitor the state of the relay in real time, can quickly realize the adhesion detection of the relay under the condition of not needing the cooperation of other relays, can quickly react on abnormal connection and disconnection, enhances the online diagnosis capability of equipment on a main power circuit, and enables a high-frequency signal to enter a high-voltage circuit in a coupling mode, thereby being easy to carry out high-voltage isolation, convenient to arrange and easy to modularize.
Drawings
Fig. 1 is a schematic configuration diagram of a state detection device of a relay according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a DC charging system according to a specific example of the present invention;
fig. 3 is a flowchart of a method of detecting a state of a relay according to an embodiment of the present invention.
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.
Fig. 1 is a schematic configuration diagram of a state detection device of a relay according to an embodiment of the present invention. As shown in fig. 1, the state detecting device includes: a power line carrier communication unit 1 and a controller (not specifically shown in fig. 1).
The relay K is arranged on the power line, and the power line carrier communication units are used for acquiring the power spectral density of a power line carrier signal on the power line where the relay K is located; the controller is used for judging the state of the relay K according to the power spectral density of the power line carrier signal where the relay K is located.
Specifically, as shown in fig. 1, when the relay K is closed, the power line carrier signal passes through the relay K via path 1; if the relay K is open-circuited, the power line carrier signal passes through the relay K through a coupling path (relay K auxiliary contact), and since the attenuation of a circuit of the coupling path is greater than that of a through path of the path 1, the received signal intensity (power spectral density) at a receiving end of power line carrier communication is obviously reduced, when a circuit parameter is fixed, the received signal intensity is measured through a power line carrier unit, and a measurement result can be used as a basis for judging the on state of the relay K. The auxiliary power supply in fig. 1 is a power supply for the auxiliary contact of the relay K, the auxiliary power supply may also supply power to the power line carrier communication unit, and R is a power load.
According to the method, the characteristics of communication signal attenuation in power line carrier communication and the correlation of the passing paths of high-frequency signals are applied to relay K adhesion detection, the communication high-frequency signals pass through different paths due to the fact that whether the relay K is adhered after being disconnected or not, the strength of the signals received by both communication parties is influenced, and after the strength of the signals sent by both communication parties is calibrated, the adhesion condition of the relay K can be judged by testing the strength (power spectral density) of the received signals.
From this, the device can carry out the control of the power spectral density of the power line carrier signal on the power line at relay place in real time, both can real time monitoring relay state, can realize the relay adhesion detection fast under the circumstances that does not need other relay K cooperations again, can all carry out the quick response to unusual switch on and break off, the online diagnostic ability of reinforcing equipment to main power circuit, get into high voltage circuit with high frequency signal through the mode of coupling, carry out high-pressure isolation easily, conveniently arrange, easy modularization.
According to an embodiment of the present invention, as shown in fig. 1, the power line carrier communication unit includes: coupling capacitor C, coupling transformer T and demodulator.
The coupling capacitor C is used for coupling a power line carrier signal on a power line where the relay K is located; a primary coil of the coupling transformer T is connected to a power line where the relay K is located through a coupling capacitor, one secondary coil of the coupling transformer is used as a transmitting end, and the other secondary coil of the coupling transformer is used as a receiving end; the demodulator is used for demodulating the power spectral density of the received power line carrier signal on the power line.
Specifically, the coupling capacitor C can couple a signal on the power line to the coupling transformer T, and can realize high-voltage isolation, and the coupling transformer T can realize transmission and reception of a power line carrier signal and can realize filtering.
According to an embodiment of the invention, the controller is specifically configured to: acquiring a standard state of a relay and a power spectral density of a power line carrier signal where the relay is located; and if the standard state of the relay is disconnection and the power spectral density of the power line carrier signal where the relay is located is in the power spectral density interval when the relay is not reliably disconnected or is in the power spectral density interval when the relay is connected, judging that the relay is adhered.
Specifically, the power spectral densities of power line carrier signals when the relay is in different switching states are measured in advance, and according to the measurement result, a power spectral density section PSD1 (C1, C2) when the relay is turned on is calibrated, a power spectral density section PSD3 (O1, O2) when the relay is reliably turned off and a power spectral density section PSD2 (F1, F2) when the relay is not reliably turned off (stuck) are calibrated.
The power spectral density dB value (more than 0) measured by the QCA7000 series is multiplied by-1 after being added with 50, and then becomes the power spectral density dBm/Hz of the signal. It is known that the smaller the value measured by the QCA7000 chip, the stronger the signal strength.
The controller acquires the standard state of the relay, namely the set state, and the state that the relay should be in, and can acquire the standard state of the electric appliance according to the state of the system in which the controller is located, and simultaneously acquire the power spectral density of the power line carrier signal in which the relay is located, and then judge whether the power spectral density of the power line carrier signal in which the relay is located corresponds to the standard state of the relay. And if the standard state of the relay is off and the power spectral density of the power line carrier signal where the relay is located is in the power spectral density interval when the relay is not reliably off or in the power spectral density interval when the relay is on, judging that the relay is adhered.
It can be understood that whether the on-off state of the relay is consistent with the set state or not is judged according to the state of the system, so that the state of the relay is diagnosed in real time. The controller can also judge the state of the relay according to the section where the power spectral density of the power line carrier signal of the relay is located, that is, if the power spectral density is in the section PSD1, the relay is judged to be on, and if the power spectral density is in the section PSD3, the relay is judged to be off.
According to one embodiment of the invention, the relay comprises two, the device further comprising: and the controller is also used for respectively acquiring the power spectral density of power line carrier signals between every two power line carrier communication units so as to perform relay adhesion positioning.
Specifically, a third power line carrier communication unit can be arranged between the two relays, the third power line carrier communication unit can be networked with other power line carrier communication units in the system, when the relays are adhered, the power spectral density of power line carrier signals between every two power line carrier communication units is obtained by the controller respectively without the cooperation of other relays, and the relay adhesion positioning can be carried out according to the power spectral density of the power line carrier signals.
As a specific example, fig. 2 is a schematic diagram of a DC charging system in GB/T18487.1-2015, where the plc communication units are designed using QCA7000 series chips, where R1-R5 are resistors, U1 and U2 are power supplies, AC/DC are AC/DC converters, DC/DC are DC/DC converters, and K3 and K4 are low-voltage relays, and if two plc communication units 1 are installed on the power supply side of K1 and K2 and the battery pack side of K5 and K6, respectively, the status detection process is as follows:
after the power line carrier communication units are installed at the designated positions, the power line carrier communication units communicate with each other, power spectral densities of K1, K2, K5 and K6 in different switch states are measured, a power spectral density section PSD1 when the relay is switched on is calibrated to be (C1 and C2), a power spectral density section PSD3 when the relay is reliably switched off is calibrated to be (O1 and O2), and a power spectral density section PSD2 when the relay is not reliably switched off is calibrated to be (F1 and F2).
In the charging process of the electric automobile, the power line carrier communication units on the vehicle-mounted charger and the charger are respectively communicated with the vehicle controller and the non-vehicle-mounted charger controller, and the power spectral density of the power line carrier signal sent by the opposite side, which is measured by the power spectral density reporting unit, is reported in real time. And the vehicle controller and the off-board charger controller judge whether the on-off state of the relay is consistent with the set state according to the state of the system, so that the state of the relay is diagnosed in real time. In the charging process, if the relay is in an off state, but the strength of the power line carrier signal acquired by the controller is in the interval of the PSD1 or PSD2, it can be considered that the relay adhesion fault occurs in the system.
Or a power line carrier communication unit can be arranged between the K1 and the K2 and between the K5 and the K6, so that three communication devices are networked, the signal intensity between every two communication devices is measured, and the relay on which the fault occurs is accurately positioned.
In summary, according to the state detection apparatus of the relay in the embodiment of the present invention, the power spectral density of the power line carrier signal on the power line on which the relay is located is obtained through the power line carrier communication units respectively disposed on the two sides of the relay, and the controller determines the state of the relay according to the power spectral density of the power line carrier signal on which the relay is located. The device can carry out the control of the power spectral density of the power line carrier signal on the power line at relay place in real time, both can real time monitoring relay state, can realize the relay adhesion detection fast under the circumstances that does not need other relay cooperations again, can all carry out the quick response to improper switching on and switching off, the online diagnostic ability of main power circuit is got into high voltage circuit with high frequency signal through the mode of coupling, carry out high pressure isolation easily, conveniently arrange, easy modularization.
Corresponding to the state detection device of the relay, the invention also provides a state detection method of the relay. Since the method embodiment of the present invention corresponds to the apparatus embodiment described above, details that are not disclosed in the method embodiment may refer to the apparatus embodiment described above, and are not described again in the present invention.
Fig. 3 is a flowchart of a state detection method of a relay according to an embodiment of the present invention, as shown in fig. 3, the method including the steps of:
and S1, arranging power line carrier communication units on two sides of the relay so as to obtain the power spectral density of the power line carrier signal on the power line where the relay is located through the power line carrier communication units.
And S2, judging the state of the relay according to the power spectral density of the power line carrier signal where the relay is located.
According to an embodiment of the present invention, as shown in fig. 1, the power line carrier communication unit includes: coupling capacitor C, coupling transformer T and demodulator.
The coupling capacitor C is used for coupling a power line carrier signal on a power line where the relay is located; a primary coil of the coupling transformer T is connected to a power line where the relay is located through a coupling capacitor, one secondary coil of the coupling transformer is used as a transmitting end, and the other secondary coil of the coupling transformer is used as a receiving end; the demodulator is used for demodulating the power spectral density of the received power line carrier signal on the power line.
Specifically, the coupling capacitor C can couple a signal on the power line to the coupling transformer T, and can realize high-voltage isolation, and the coupling transformer T can realize transmission and reception of a power line carrier signal and can realize filtering.
According to an embodiment of the present invention, determining the state of the relay according to the power spectral density of the power line carrier signal where the relay is located includes: acquiring a standard state of a relay and a power spectral density of a power line carrier signal where the relay is located; and if the standard state of the relay is disconnection and the power spectral density of the power line carrier signal where the relay is located is in the power spectral density interval when the relay is not reliably disconnected or is in the power spectral density interval when the relay is connected, judging that the relay is adhered.
According to an embodiment of the invention, the relay comprises two, and the method further comprises: a third power line carrier communication unit is arranged between the two relays, and each power line carrier communication unit is networked; and respectively acquiring the power spectral density of the power line carrier signals between every two power line carrier communication units so as to perform relay adhesion positioning.
According to the state detection method of the relay, the power line carrier communication units are arranged on two sides of the relay, so that the power spectral density of a power line carrier signal on a power line where the relay is located is obtained through the power line carrier communication units, and the state of the relay is judged according to the power spectral density of the power line carrier signal where the relay is located. The method can monitor the power spectral density of the power line carrier signal on the power line where the relay is located in real time, can monitor the state of the relay in real time, can quickly realize adhesion detection of the relay under the condition that other relays are not matched, can quickly react on abnormal connection and disconnection, enhances the online diagnosis capability of equipment on a main power circuit, enables a high-frequency signal to enter a high-voltage circuit in a coupling mode, is easy to perform high-voltage isolation, is convenient to arrange, and is easy to modularize.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
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 (8)
1. A state detecting device of a relay, characterized by comprising:
the power line carrier communication units are respectively arranged on two sides of the relay and are used for acquiring the power spectral density of a power line carrier signal on a power line where the relay is located;
and the controller is used for judging the state of the relay according to the power spectral density of the power line carrier signal where the relay is located.
2. The state detection device of a relay according to claim 1, wherein the power line carrier communication unit includes:
the coupling capacitor is used for coupling power line carrier signals on a power line where the relay is located;
a primary coil of the coupling transformer is connected to a power line where the relay is located through a coupling capacitor, one secondary coil of the coupling transformer serves as a transmitting end, and the other secondary coil of the coupling transformer serves as a receiving end;
a demodulator to demodulate a power spectral density of a received power line carrier signal on the power line.
3. The relay state detection device according to claim 2, wherein the controller is specifically configured to:
acquiring a standard state of the relay and a power spectral density of a power line carrier signal where the relay is located;
and if the standard state of the relay is off and the power spectral density of the power line carrier signal where the relay is located is in the power spectral density interval when the relay is not reliably off or in the power spectral density interval when the relay is on, judging that the relay is adhered.
4. The state detecting device of a relay according to claim 1, wherein the relay includes two, the device further comprising: a third power line carrier communication unit provided between the two relays, each of the power line carrier communication units performing networking,
the controller is further used for respectively obtaining the power spectral density of the power line carrier signals between every two power line carrier communication units so as to perform relay adhesion positioning.
5. A method for detecting a state of a relay, comprising:
arranging power line carrier communication units on two sides of the relay so as to obtain the power spectral density of a power line carrier signal on a power line where the relay is located through the power line carrier communication units;
and judging the state of the relay according to the power spectral density of the power line carrier signal where the relay is located.
6. The relay state detection method according to claim 5, wherein the power line carrier communication unit includes:
the coupling capacitor is used for coupling power line carrier signals on a power line where the relay is located;
a primary coil of the coupling transformer is connected to a power line where the relay is located through a coupling capacitor, one secondary coil of the coupling transformer serves as a transmitting end, and the other secondary coil of the coupling transformer serves as a receiving end;
a demodulator to demodulate a power spectral density of a received power line carrier signal on the power line.
7. The method for detecting the state of the relay according to claim 5, wherein the step of judging the state of the relay according to the power spectral density of the power line carrier signal where the relay is located comprises the steps of:
acquiring a standard state of the relay and a power spectral density of a power line carrier signal where the relay is located;
and if the standard state of the relay is off and the power spectral density of the power line carrier signal where the relay is located is in the power spectral density interval when the relay is not reliably off or in the power spectral density interval when the relay is on, judging that the relay is adhered.
8. The method of detecting the state of a relay according to claim 5, wherein the relay includes two, the method further comprising:
a third power line carrier communication unit is arranged between the two relays, and each power line carrier communication unit is networked;
and respectively acquiring the power spectral density of the power line carrier signals between every two power line carrier communication units so as to perform relay adhesion positioning.
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| CN114013299A (en) * | 2021-11-29 | 2022-02-08 | 同济大学 | Lithium ion battery pack carrier communication system and electric automobile |
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Application publication date: 20210525 |