CN113281677A

CN113281677A - Wiring detection method, device, equipment, variable frequency control circuit and system

Info

Publication number: CN113281677A
Application number: CN202110377435.8A
Authority: CN
Inventors: 杨帆; 梁栋; 杨智雄
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-08-20

Abstract

The invention relates to the technical field of wiring detection, in particular to a wiring detection method, a wiring detection device, wiring detection equipment, a frequency conversion control circuit and a system, wherein the method comprises the following steps: the inverter bridges in the inverter circuit are conducted one by one, and test information is input when the inverter bridges are conducted each time; acquiring an electrical parameter value acquired by the sampling assembly during each conduction; comparing the electric parameter value with a standard comparison table under the normal wiring condition to determine the abnormal wiring condition; the wiring abnormity comprises phase sequence errors or open circuit errors; if the phase sequence is wrong, the input signal of the wrong phase sequence is adjusted, so that the load inversion caused by wiring errors is avoided, manual adjustment is not needed, the speed is high, and the efficiency is high; if the circuit is disconnected incorrectly, the circuit-disconnection error reminding information is output, the worker receives the circuit-disconnection error reminding information and directly reconnects the circuit-disconnection error reminding information without checking one by one, the operation is simple, and the troubleshooting time is effectively shortened.

Description

Wiring detection method, device, equipment, variable frequency control circuit and system

Technical Field

The invention relates to the technical field of wiring detection, in particular to a wiring detection method, a wiring detection device, wiring detection equipment, a frequency conversion control circuit and a frequency conversion control system.

Background

The frequency converter is an equipment for converting power frequency power supply into AC power supply with various frequencies to implement load variable speed operation, in which the control circuit can be used for controlling main circuit, the rectifier circuit can be used for converting AC power into DC power, the DC intermediate circuit can be used for smoothing and filtering output of rectifier circuit, and the inverter circuit can be used for converting DC power into AC power. The frequency converter mainly has the functions of energy conservation and speed regulation. With the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.

Usually, for the frequency conversion drive control of loads such as compressors and loads, the loads such as compressors and loads can be normally operated only by connecting the loads and the frequency converter in a sequence according to a set requirement, if the loads are connected in a wrong sequence, not only the loads can not normally operate, but also the loads can be changed into a correct sequence by manual operation, and in the using process, if the problems of loosening and opening of cables of the loads and the like occur, the loads can not normally operate, and a worker is required to perform integral fault detection and troubleshooting, so that the operation is complex and the time is wasted.

Disclosure of Invention

In view of the above, the present invention provides a wiring detection method, device, apparatus, variable frequency control circuit and system, so as to overcome the problems of complicated operation and time waste of variable frequency driving wiring detection of the present compressor, load and other loads.

In order to achieve the purpose, the invention adopts the following technical scheme:

a wiring detection method is applied to a variable frequency control circuit, wherein the variable frequency control circuit comprises a sampling assembly and an inverter circuit formed by parallel connection of inverter bridges; the inverter bridge is correspondingly connected with the phase interfaces of the load one by one, and the sampling assembly is connected between the inverter bridge and the corresponding phase interface;

the method comprises the following steps: switching on the inverter bridges in the inverter circuit one by one, and inputting test information when switching on each time;

acquiring an electrical parameter value acquired by the sampling assembly during each conduction;

comparing the electric parameter value with a standard comparison table under the normal wiring condition to determine the abnormal wiring condition; wherein the wiring abnormality comprises a phase sequence error or an open circuit error;

if the phase sequence is wrong, adjusting the input signal of the wrong phase sequence;

and if the circuit breaking error is detected, outputting a circuit breaking error reminding message.

Further, in the above wiring detection method, each of the inverter bridges includes a first power switch and a second power switch; an emitter of the first power switch and a collector of the second power switch are connected with the phase interfaces corresponding to the loads;

the inverter bridge in the inverter circuit is conducted one by one, and the inverter bridge comprises:

and switching on a first power switch in the inverter bridge, and simultaneously closing a second power switch in the inverter bridge so as to switch on the inverter bridge.

Further, in the above wiring detection method, if the phase sequence is wrong, adjusting the input signal with the wrong phase sequence includes:

if the phase sequence is wrong, determining the position of the phase sequence error;

and exchanging the input signals with the wrong phase sequence according to the position of the phase sequence error.

Further, in the above wiring detection method, the load includes a three-phase load;

correspondingly, the phase sequence error comprises that two phases in the three-phase load are connected reversely.

Further, in the above wiring detection method, the test information includes a test current or a test signal.

Further, in the above wiring detection method, the electrical parameter value includes a current value or a voltage value.

Furthermore, the invention also provides a wiring detection device, which is applied to a variable frequency control circuit, wherein the variable frequency control circuit comprises a sampling component and an inverter circuit formed by parallel inverter bridges; the inverter bridge is correspondingly connected with the phase interfaces of the load one by one, and the sampling assembly is connected between the inverter bridge and the corresponding phase interface;

the device comprises:

the conduction module is used for conducting the inverter bridges in the inverter circuit one by one and inputting test information during each conduction;

the acquisition module is used for acquiring the electrical parameter value acquired by the sampling assembly during each conduction;

the determining module is used for comparing the electric parameter value with a standard comparison table under the normal wiring condition to determine the abnormal wiring condition; wherein the wiring abnormality comprises a phase sequence error or an open circuit error;

the adjusting module is used for adjusting the input signal of the wrong phase sequence if the phase sequence is wrong;

and the output module is used for outputting the open circuit error reminding information if the open circuit error is detected.

Further, the invention also provides a wiring detection device, which comprises a processor and a memory, wherein the processor is connected with the memory:

the processor is used for calling and executing the program stored in the memory;

the memory is configured to store the program, and the program is configured to at least perform the wiring detection method according to any one of the above.

Furthermore, the invention also provides a frequency conversion control circuit, which comprises a sampling component, an inverter circuit formed by connecting inverter bridges in parallel and the wiring detection equipment;

the inverter bridge is correspondingly connected with the phase interfaces of the load one by one, and the sampling assembly is connected between the inverter bridge and the corresponding phase interface;

and the wiring detection equipment is respectively connected with the control end of the inverter bridge and the sampling assembly.

Furthermore, in the frequency conversion control circuit, each inverter bridge is provided with a first power switch and a second power switch;

the emitter of the first power switch is connected with the collector of the second power switch, and the emitter of the first power switch and the collector of the second power switch are also connected with the phase interface corresponding to the load;

and the base electrode of the first power switch and the base electrode of the second power switch are respectively used as the control ends of the inverter bridge and are connected with wiring detection equipment.

Furthermore, the frequency conversion control circuit further comprises a first capacitor and a second capacitor;

the first capacitor and the second capacitor are connected with the inverter bridge in parallel.

Further, the above frequency conversion control circuit, the sampling assembly includes: current sensors, transformers, or resistors.

Further, in the above frequency conversion control circuit, the first power switch includes: NPN-type triodes, IGBT transistors or MOSFET transistors;

the second power switch comprises an NPN type triode, an IGBT transistor or a MOSFET transistor.

Furthermore, the invention also provides a frequency conversion system which comprises the frequency conversion control circuit.

Further, the inverter system comprises an inverter refrigerator and an inverter air conditioner.

The invention relates to a wiring detection method, a wiring detection device, a wiring detection equipment, a frequency conversion control circuit and a system, wherein the method is applied to the frequency conversion control circuit which comprises a sampling assembly and an inverter circuit formed by parallel inverter bridges; the inverter bridge is connected with the phase interfaces of the load in a one-to-one correspondence manner, and the sampling assembly is connected between the inverter bridge and the corresponding phase interface; the method comprises the following steps: the inverter bridges in the inverter circuit are conducted one by one, and test information is input when the inverter bridges are conducted each time; acquiring an electrical parameter value acquired by the sampling assembly during each conduction; comparing the electric parameter value with a standard comparison table under the normal wiring condition to determine the abnormal wiring condition; the wiring abnormity comprises phase sequence errors or open circuit errors; if the phase sequence is wrong, the input signal of the wrong phase sequence is adjusted, so that the load inversion caused by wiring errors is avoided, manual adjustment is not needed, the speed is high, and the efficiency is high; if the circuit is disconnected incorrectly, the circuit-disconnection error reminding information is output, the worker receives the circuit-disconnection error reminding information and directly reconnects the circuit-disconnection error reminding information without checking one by one, the operation is simple, and the troubleshooting time is effectively shortened.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a circuit diagram of a frequency conversion control circuit according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of another embodiment of the variable frequency control circuit of the present invention;

FIG. 3 is a flow chart provided by one embodiment of a wiring detection method of the present invention;

FIG. 4 is a schematic structural diagram of a wiring detection device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram provided by an embodiment of the wiring detection device of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Examples

Fig. 1 is a circuit diagram of a frequency conversion control circuit according to an embodiment of the present invention.

As shown in fig. 1, the frequency conversion control circuit of the present embodiment includes an inverter circuit 10, a sampling component 11, and a wiring detection device. The inverter circuit 10 includes a plurality of inverter bridges connected in parallel, the inverter bridges are connected to phase interfaces of the load 20 in a one-to-one correspondence manner, and the sampling assemblies 11 are connected between the inverter bridges and the corresponding phase interfaces. In this embodiment, as shown in fig. 1, a three-phase load is taken as an example for explanation, and correspondingly, the inverter circuit 10 includes three groups of inverter bridges connected in parallel, namely a first inverter bridge 101, a second inverter bridge 102, and a third inverter bridge 103, and three sampling assemblies 11, namely a first sampling assembly RS1, a second sampling assembly RS2, and a third sampling assembly RS3, are provided. The set of inverter bridges is correspondingly connected with one phase interface of the load 20 and is correspondingly connected with one sampling assembly 11. The wiring detection equipment is respectively connected with the control end of the inverter bridge and the sampling assembly 11.

In some alternative embodiments, load 20 comprises a motor, a compressor, or the like.

The frequency conversion control circuit comprises a sampling component 11 and an inverter circuit 10 formed by parallel connection of inverter bridges; the inverter bridge is correspondingly connected with the phase interfaces of the load 20 one by one, and the sampling assembly 11 is connected between the inverter bridge and the corresponding phase interfaces; the inverter bridges in the inverter circuit 10 are turned on one by one, and test information is input at each turn-on; acquiring an electrical parameter value acquired by the sampling component 11 during each conduction; comparing the electric parameter value with a standard comparison table under the normal wiring condition to determine the abnormal wiring condition; the wiring abnormity comprises phase sequence errors or open circuit errors; if the phase sequence is wrong, the input signal of the wrong phase sequence is adjusted, so that the load inversion caused by wiring errors is avoided, manual adjustment is not needed, the speed is high, and the efficiency is high; if the circuit is disconnected incorrectly, the circuit-disconnection error reminding information is output, the worker receives the circuit-disconnection error reminding information and directly reconnects the circuit-disconnection error reminding information without checking one by one, the operation is simple, and the troubleshooting time is effectively shortened.

In some alternative embodiments, a first power switch Q1 and a second power switch Q2 are provided on each inverter bridge.

The emitter of the first power switch Q1 is connected to the collector of the second power switch Q2, and the emitter of the first power switch Q1 is connected to the phase interface of the second power switch Q2 corresponding to the load 20. The base of the first power switch Q1 and the base of the second power switch Q2 are respectively connected to the connection detection device as the control terminal of the inverter bridge. The wire detection device controls the conduction of the first power switch Q1 in the inverter bridge and simultaneously closes the second power switch Q2 in the inverter bridge to achieve the conduction of the inverter bridge.

Specifically, in this embodiment, if it is required to only turn on the first inverter bridge 101, the first power switch Q1 in the first inverter bridge 101 is controlled to be turned on, the second power switch Q2 in the first inverter bridge 101 is closed, the first power switch Q1 in the second inverter bridge 102 is controlled to be closed, the second power switch Q2 in the second inverter bridge 102 is turned on, the first power switch Q1 in the third inverter bridge 103 is controlled to be closed, and the second power switch Q2 in the third inverter bridge 102 is controlled to be turned on, so that the first inverter bridge 101 is turned on, and the second inverter bridge 102 and the third inverter bridge 103 are turned off. If only the second inverter bridge 102 or the third inverter bridge 103 is turned on, the operating state of the switch is the same as that described above, and the details of this embodiment are not repeated.

In some optional embodiments, the first power switch Q1 may selectively use an NPN transistor, an IGBT transistor, or a MOSFET transistor, and the second power switch Q2 may also selectively use an NPN transistor, an IGBT transistor, or a MOSFET transistor, which is not limited in this embodiment.

In some alternative embodiments, the sampling component 11 may optionally use a current sensor, a transformer, or a resistor, which is not limited in this embodiment.

In the embodiment shown in fig. 1, the front end of the inverter 10 may be an inversion state in an ac mode, the input state of the front end is not limited, and any topology satisfying the back-end three-phase input load may be used.

Fig. 2 is a circuit diagram of another embodiment of the variable frequency control circuit of the present invention.

In some optional embodiments, a dc-to-ac mode topology is also provided. The variable frequency control circuit shown in fig. 2 further includes a first capacitor C1 and a second capacitor C2 on the basis of the variable frequency control circuit shown in fig. 1, and both the first capacitor C1 and the second capacitor C2 are connected in parallel with the inverter bridge.

Based on a general inventive concept, the present invention also provides a frequency conversion system, which includes the frequency conversion control circuit of the above embodiment.

In some optional embodiments, the inverter system comprises an inverter refrigerator and an inverter air conditioner.

Based on a general inventive concept, the invention further provides a wiring detection method applied to the frequency conversion control circuit of any of the above embodiments.

FIG. 3 is a flow chart of a method for detecting a connection according to an embodiment of the present invention.

As shown in fig. 3, the wiring detection method of the present embodiment includes the following steps:

and S31, conducting the inverter bridges in the inverter circuit one by one, and inputting test information when conducting each time.

In this embodiment, a three-phase load is taken as an example for explanation, and correspondingly, the inverter circuit includes three groups of inverter bridges connected in parallel, and three sampling assemblies are provided, where one group of inverter bridges is correspondingly connected to one phase interface of the load and is correspondingly connected to one sampling assembly.

If the three phases of the three-phase load are divided into a U phase, a V phase and a W phase, the inverter bridge connected with the U-phase interface, the inverter bridge connected with the V-phase interface and the inverter bridge connected with the W-phase interface can be respectively conducted, and test information is input when the inverter bridge is conducted each time.

When one of the inverter bridges is conducted, the first power switch in the inverter bridge corresponding to each phase interface of the load can be conducted, and the second power switch in the inverter bridge is closed.

In some alternative embodiments, the test information may be a test current or a test signal.

And S32, acquiring the electric parameter value acquired by the sampling assembly when the sampling assembly is turned on every time.

When each inverter bridge is conducted, the sampling assembly can acquire the electric parameter values. In this embodiment, the electrical parameter value collected by the sampling component when conducting each time can be obtained.

In some alternative embodiments, the electrical parameter value comprises a current value or a voltage value.

And S33, comparing the electric parameter value with the standard comparison table under the normal wiring condition, and determining the abnormal wiring condition.

The comparison can be performed by presetting a standard comparison table under the condition of normal wiring. And the abnormal wiring condition can be determined by comparison.

In some alternative embodiments, the wiring anomalies include phase sequence errors or open circuit errors.

The phase sequence error refers to the condition that all phase interfaces of the load are connected, but the connection is wrong; short circuit errors refer to conditions such as missing connections, open cable contacts, etc.

In this embodiment, the input test information is taken as a test current i, and the sampling component detects a current value by using a current sensor as an example, so as to further describe the above.

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, when each inverter bridge is conducted under the normal wiring condition, the standard comparison table is shown in table 1.

In table 1, case 1 indicates that the inverter bridge connected to the U-phase interface is turned on, and test information is input; case 2 represents turning on the inverter bridge connected to the V-phase interface and inputting test information; case 3 represents turning on the inverter bridge connected to the W-phase interface and inputting test information. In tables 2 to 11, cases 1, 2, and 3 are the same as in table 1, and are not described one by one.

In addition, the standard comparison table may be obtained by testing the frequency conversion control circuit with the same model as the tested frequency conversion control circuit and connected correctly, or may be obtained by calculation according to a circuit schematic diagram of the tested frequency conversion control circuit, which is not limited in this embodiment.

TABLE 1

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if V and W are connected in an opposite manner, when each inverter bridge is turned on, the sampling component can acquire current values as shown in table 2.

TABLE 2

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if U and W are connected in an opposite manner, when each inverter bridge is turned on, the current value that can be collected by the sampling component is shown in table 3.

TABLE 3

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if the U and V phases are opposite, when each inverter bridge is turned on, the current value that can be collected by the sampling component is shown in table 4.

TABLE 4

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if the U-phase is open, when each inverter bridge is turned on, the current value collected by the sampling component is as shown in table 5.

TABLE 5

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if the V-phase is in phase failure, when each inverter bridge is turned on, the current value collected by the sampling component is as shown in table 6.

TABLE 6

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if the W-phase is in a phase-loss state, when each inverter bridge is turned on, the current value collected by the sampling component is as shown in table 7.

TABLE 7

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if V, W phases are open, when each inverter bridge is turned on, the current value collected by the sampling component is as shown in table 8.

TABLE 8

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if U, W phases are open, when each inverter bridge is turned on, the sampling component can acquire current values as shown in table 9.

TABLE 9

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if U, V phases are open, when each inverter bridge is turned on, the sampling component can acquire current values as shown in table 10.

Watch 10

In the frequency conversion control circuit corresponding to the embodiment shown in fig. 1 or fig. 2, if U, V, W phases are open, when each inverter bridge is turned on, the current values collected by the sampling component are as shown in table 11.

TABLE 11

When the inverter bridges in the inverter circuits are conducted one by one and test information is input during each conduction, different electrical parameter value sampling combinations can be obtained. In this embodiment, taking the test current i as an example, when the test current i is applied to the U phase according to table 1, i/2 currents are obtained in the V phase and the W phase, respectively, and when the unit current i is applied to the V phase and the W phase according to table 1, respectively, corresponding output currents can be obtained. The table 1 is a standard comparison table in a normal wiring state, and with this as a standard, when an abnormal condition occurs, such as reverse V phase to W phase, reverse U phase to W phase, and reverse U phase to V phase, the state tables of tables 2, 3, and 4 can be obtained respectively, and when the obtained state tables are compared with the table in a normal state, a specific wrong connection sequence is determined after an abnormality is found, so as to give a conclusion that the phase sequence is wrong.

In another use state, there may be a state in which the unit cable or winding is open, i.e., an open fault. Therefore, after a fault occurs, a test current i can be injected into the load by a similar method, and sampled current values are obtained for comparison, wherein table 1 is still used as a standard table, tables 5, 6 and 7 are used as abnormal table output states in an open circuit state, and are compared with table 1, so that a final result of the open circuit state is given. If two or three phase loss occurs, the corresponding state diagrams are respectively shown in table 8, table 9, table 10 and table 11, and any numerical value is 0, so that more than two phase loss can be judged.

It should be noted that table 1 is only used as a representative table, the state values of which can be given by the designer as reference according to specific situations, and the specific values of which can be changed according to practical application situations.

And S34, if the phase sequence is wrong, adjusting the input signal of the wrong phase sequence, and if the phase sequence is wrong, outputting a warning message of the open circuit error.

If the comparison shows that no wiring error occurs, no processing is required.

If, by comparison, it is determined that a phase sequence error has occurred, then the input signal for the wrong phase sequence may be adjusted.

In some alternative embodiments, the input signal of the wrong phase sequence may be adjusted by:

step one, if the phase sequence is wrong, determining the position of the phase sequence mistake;

step two: and exchanging input signals with wrong phase sequence according to the position of the phase sequence error.

Specifically, the position of the phase sequence error is further determined according to a comparison table; then, the input signals with wrong phase sequence are exchanged according to the position with wrong phase sequence. For example, if U, V two phases are mistakenly connected, if the normal program gives instruction M to U phase and gives instruction N to V phase, then the instruction will be assigned in the program, and the instruction code number is increased to Q, the specific process is as follows:

(1) assigning instruction M to Q;

(2) assigning instruction N to M;

(3) assigning instruction Q to N;

through the above operations, the original instruction given to the U phase is switched to the instruction given to the V phase, and the original instruction given to the V phase is switched to the instruction given to the U phase, so that the command interchange is realized, and the load starting is realized on the premise of not manually changing the phase sequence.

If the comparison shows that the open circuit error occurs, the open circuit error reminding information can be directly output, for example, a fault code is output through a set display screen.

The invention discloses a wiring detection method applied to a variable frequency control circuit, which comprises the following steps: the inverter bridges in the inverter circuit are conducted one by one, and test information is input when the inverter bridges are conducted each time; acquiring an electrical parameter value acquired by the sampling assembly during each conduction; comparing the electric parameter value with a standard comparison table under the normal wiring condition to determine the abnormal wiring condition; the wiring abnormity comprises phase sequence errors or open circuit errors; if the phase sequence is wrong, the input signal of the wrong phase sequence is adjusted, so that the load inversion caused by wiring errors is avoided, manual adjustment is not needed, the speed is high, and the efficiency is high; if the circuit is disconnected incorrectly, the circuit-disconnection error reminding information is output, the worker receives the circuit-disconnection error reminding information and directly reconnects the circuit-disconnection error reminding information without checking one by one, the operation is simple, and the troubleshooting time is effectively shortened.

By adopting the technical scheme of the embodiment, three U/V/W three-phase wires of the three load cables are randomly connected, and the driving control program can still ensure that the unit is normally started through identification, so that the trouble of subsequent manual operation change is avoided, and the maintenance cost of the equipment is integrally reduced; in the using process of a customer, if the load cable has the problems of loosening, opening and the like, the method can also be used for detecting, so that fault reminding is output.

In some alternative embodiments, if the load is a three-phase load, due to the characteristics of the three-phase load body, only the two phases are connected reversely (U and V, V and W, W and U) to cause the reverse rotation, and the rotation direction of the load is not changed when the three phases are connected reversely, so that only the two phases are required to be processed, and therefore, the above command operation is executed only when tables 2, 3 and 4 are present, otherwise, the control is performed in the original manner.

Based on a general inventive concept, the present invention further provides a wiring detection apparatus for implementing the above method embodiments.

Fig. 4 is a schematic structural diagram provided by an embodiment of the connection detecting apparatus of the present invention.

As shown in fig. 4, the wiring detecting device of the present embodiment includes:

the conduction module 41 is used for conducting the inverter bridges in the inverter circuit one by one and inputting test information during each conduction;

an obtaining module 42, configured to obtain an electrical parameter value acquired by the sampling component during each conduction;

a determining module 43, configured to compare the electrical parameter value with a standard comparison table under a normal wiring condition, and determine an abnormal wiring condition; the wiring abnormity comprises phase sequence errors or open circuit errors;

an adjusting module 44, configured to adjust an input signal with a wrong phase sequence if the phase sequence is wrong;

and the output module 45 is used for outputting the open circuit error reminding information if the open circuit error is detected.

In the wiring detection device, the conduction modules 41 conduct inverter bridges in an inverter circuit one by one, and test information is input during each conduction; the obtaining module 42 obtains the electrical parameter value collected by the sampling component during each conduction; the determining module 43 compares the electrical parameter value with a standard comparison table under the normal wiring condition to determine the abnormal wiring condition; the wiring abnormity comprises phase sequence errors or open circuit errors; if the phase sequence is wrong, the adjusting module 44 adjusts the input signal of the wrong phase sequence, so as to avoid load inversion caused by wiring errors, and manual adjustment is not needed, so that the speed is high, and the efficiency is high; if the fault is the open circuit fault, the output module 45 outputs open circuit fault reminding information, and the worker receives the open circuit fault reminding information and directly reconnects the circuit fault reminding information without checking one by one, so that the operation is simple, and the troubleshooting time is effectively shortened.

In some alternative embodiments, the conducting module 41 is specifically configured to conduct a first power switch in the inverter bridge, and simultaneously close a second power switch in the inverter bridge, so as to make the inverter bridge conduct.

In some optional embodiments, the adjusting module 44 is specifically configured to determine a position of the phase sequence error if the phase sequence error is detected; and exchanging input signals with wrong phase sequence according to the position of the phase sequence error.

In some alternative embodiments, the phase sequence error comprises two of the phases in the three-phase load being reversed.

In some alternative embodiments, the test information comprises a test current or a test signal.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

Based on a general inventive concept, the present invention further provides a wiring detection device, which is used for implementing the above method embodiments.

As shown in fig. 5, the wiring detecting apparatus of the present embodiment includes a processor 51 and a memory 52, and the processor 51 is connected to the memory 52. Wherein, the processor 51 is used for calling and executing the program stored in the memory 52; the memory 52 is used to store a program for executing at least the wiring detecting method in the above embodiment.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.

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 specific logical functions or steps of the 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.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

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.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

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 do not necessarily 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.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The wiring detection method is characterized by being applied to a frequency conversion control circuit, wherein the frequency conversion control circuit comprises a sampling assembly and an inverter circuit formed by parallel connection of inverter bridges; the inverter bridge is correspondingly connected with the phase interfaces of the load one by one, and the sampling assembly is connected between the inverter bridge and the corresponding phase interface;

2. The wire detection method of claim 1, wherein each set of the inverter bridges comprises a first power switch and a second power switch; an emitter of the first power switch and a collector of the second power switch are connected with the phase interfaces corresponding to the loads;

3. The wiring detection method of claim 1, wherein the adjusting the input signal with the wrong phase sequence if the phase sequence is wrong comprises:

4. The wiring detection method of claim 1, wherein the load comprises a three-phase load;

5. The wiring detection method of claim 1, wherein the test information comprises a test current or a test signal.

6. The wire detection method of claim 1, wherein the electrical parameter value comprises a current value or a voltage value.

7. The wiring detection device is characterized by being applied to a variable frequency control circuit, wherein the variable frequency control circuit comprises a sampling assembly and an inverter circuit formed by parallel connection of inverter bridges; the inverter bridge is correspondingly connected with the phase interfaces of the load one by one, and the sampling assembly is connected between the inverter bridge and the corresponding phase interface;

the device comprises:

8. A wiring detection device comprising a processor and a memory, the processor coupled to the memory:

the memory for storing the program for performing at least the wire detection method of any one of claims 1-6.

9. A variable frequency control circuit, comprising a sampling assembly, an inverter circuit formed by connecting inverter bridges in parallel, and the wiring detection device of claim 8;

10. The variable frequency control circuit according to claim 9, wherein each inverter bridge is provided with a first power switch and a second power switch;

11. The variable frequency control circuit according to claim 9, further comprising a first capacitor and a second capacitor;

12. The variable frequency control circuit of claim 9, wherein the sampling component comprises: current sensors, transformers, or resistors.

13. The variable frequency control circuit of claim 10, wherein the first power switch comprises: NPN-type triodes, IGBT transistors or MOSFET transistors;

14. A variable frequency system comprising the variable frequency control circuit of claim 8.

15. The inverter system of claim 14, wherein the inverter system comprises an inverter refrigerator and an inverter air conditioner.