CN113917314A - Circuit detection system and method for assisting three-phase output of inverter - Google Patents
Circuit detection system and method for assisting three-phase output of inverter Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The embodiment of the invention provides a circuit detection system and a method for assisting three-phase output of an inverter, wherein the circuit detection system comprises: an auxiliary inverter module including a three-phase circuit; the voltage detection module comprises a three-phase rectifier bridge unit and a single-phase voltage sensor, the three-phase rectifier bridge unit is connected with the three-phase circuit, the single-phase voltage sensor is connected with the three-phase rectifier bridge unit, and the single-phase voltage sensor can acquire an actual voltage value of the auxiliary inverter; the current detection module comprises a plurality of current transformers and a three-phase current detection unit, and the plurality of current transformers are respectively arranged corresponding to the three-phase circuit; one ends of the current transformers are grounded, and the other ends of the current transformers are connected with the three-phase current detection unit; the actual current value of the auxiliary inverter can be obtained by the three-phase current detection unit. The voltage and current detection function of three-phase output is realized.
Description
Technical Field
The invention relates to the technical field of electric locomotives, in particular to a circuit detection system and a method for assisting three-phase output of an inverter.
Background
At present, the electric locomotive has advanced from the direct current transmission era to the alternating current transmission era, and the electric locomotive is also moved to a high-speed heavy-load stage, so that unprecedented development is achieved. An auxiliary system of an electric locomotive is an important component of the electric locomotive and mainly comprises an auxiliary power supply, an auxiliary motor, a corresponding control circuit and the like. The main function of the auxiliary system is to ensure the main circuit system of the electric locomotive to fully exert the power thereof and ensure the normal operation of the locomotive.
At the present stage, the conventional output voltage detection method of the auxiliary converter adopts a mode of three voltage sensors to feed back the line voltage output by the auxiliary converter to the control system, and the conventional current detection method adopts three current sensors to feed back the output phase current of the auxiliary converter to the control system.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
The embodiment of the invention aims to provide a circuit detection system and a method for assisting three-phase output of an inverter, which realize the voltage and current detection function of the three-phase output.
Additional features and advantages of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.
According to an aspect of an embodiment of the present invention, there is provided a circuit detection system for assisting three-phase output of an inverter, including:
an auxiliary inverter module including a three-phase circuit;
the voltage detection module comprises a three-phase rectifier bridge unit and a single-phase voltage sensor, the three-phase rectifier bridge unit is connected with the three-phase circuit, the single-phase voltage sensor is connected with the three-phase rectifier bridge unit, and the single-phase voltage sensor can acquire an actual voltage value of the auxiliary inverter;
the current detection module comprises a plurality of current transformers and a three-phase current detection unit, and the plurality of current transformers are respectively arranged corresponding to the three-phase circuit; one ends of the current transformers are grounded, and the other ends of the current transformers are connected with the three-phase current detection unit; the actual current value of the auxiliary inverter can be obtained by the three-phase current detection unit.
In an exemplary embodiment of the present disclosure, the circuit detection system further includes:
and the frequency acquisition module is connected with the auxiliary inverter module and is used for acquiring the actual working frequency of the auxiliary inverter module.
In an exemplary embodiment of the present disclosure, the circuit detection system further includes:
the control module is connected with the frequency acquisition module, the voltage detection module and the current detection module, determines a theoretical voltage output value according to the acquired actual working frequency, and judges whether the actual voltage value acquired by the voltage detection module is the same as the theoretical voltage output value or not; if the current values are the same, judging whether the actual current value obtained by the current detection module is larger than a set current threshold value; and if the current is larger than the current threshold, judging that the output of the auxiliary inverter is overloaded.
In an exemplary embodiment of the disclosure, if the current is less than or equal to the current threshold, it is determined that the auxiliary inverter output is normal.
In an exemplary embodiment of the present disclosure, the circuit detection system further includes:
and if the control module judges that the actual voltage value acquired by the voltage detection module is less than one third of the theoretical voltage output value and judges that the actual current value acquired by the current detection module is greater than a set current threshold value, judging that the output of the auxiliary inverter is short-circuited.
In an exemplary embodiment of the present disclosure, the circuit detection system further includes:
and if the control module judges that the actual voltage value acquired by the voltage detection module is greater than one third of the theoretical voltage output value and less than three quarters of the theoretical voltage output value, judging that the auxiliary inverter outputs a phase failure.
According to an aspect of an embodiment of the present invention, there is provided a circuit detection method for assisting three-phase output of an inverter, including:
providing an auxiliary inverter module comprising a three-phase circuit;
providing a voltage detection module, wherein the voltage detection module comprises a three-phase rectifier bridge unit and a single-phase voltage sensor, the three-phase rectifier bridge unit is connected with the three-phase circuit, the single-phase voltage sensor is connected with the three-phase rectifier bridge unit, and the single-phase voltage sensor is used for acquiring the actual voltage value of the auxiliary inverter;
providing a current detection module, wherein the current detection module comprises a plurality of current transformers and a three-phase current detection unit, and the plurality of current transformers are respectively arranged corresponding to the three-phase circuit; one ends of the current transformers are grounded, and the other ends of the current transformers are connected with the three-phase current detection unit; and acquiring the actual current value of the auxiliary inverter through the three-phase current detection unit.
In an exemplary embodiment of the present disclosure, the circuit detection method further includes:
providing a frequency acquisition module, wherein the frequency acquisition module is connected with the auxiliary inverter module and is used for acquiring the actual working frequency of the auxiliary inverter module;
providing a control module which is connected with the frequency acquisition module, the voltage detection module and the current detection module; determining a theoretical voltage output value according to the adopted actual working frequency through the control module, and judging whether the actual voltage value acquired by the voltage detection module is the same as the theoretical voltage output value or not;
if the current values are the same, judging whether the actual current value obtained by the current detection module is larger than a set current threshold value; and if the current is larger than the current threshold, judging that the output of the auxiliary inverter is overloaded.
In an exemplary embodiment of the present disclosure, the circuit detection method further includes:
and if the control module judges that the actual voltage value acquired by the voltage detection module is less than one third of the theoretical voltage output value and judges that the actual current value acquired by the current detection module is greater than a set current threshold value, judging that the output of the auxiliary inverter is short-circuited.
In an exemplary embodiment of the present disclosure, the circuit detection method further includes:
and if the control module judges that the actual voltage value acquired by the voltage detection module is greater than one third of the theoretical voltage output value and less than three quarters of the theoretical voltage output value, judging that the auxiliary inverter outputs a phase failure.
According to the circuit detection system for assisting the three-phase output of the inverter, the current transformer of the current detection module is adopted to replace a complex Hall current sensor, so that the output detection of three-phase current is realized; a three-phase rectifier bridge of the current detection module and a circuit of a single-phase voltage sensor are adopted to replace the circuits of three single-phase voltage sensors, so that the function of three-phase voltage detection is realized. Hardware circuits in the detection system are relatively reduced, the function of detecting the voltage and the current of the inverter is realized, and the effects of cost reduction and efficiency improvement are realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic diagram of a circuit detection system for assisting three-phase output of an inverter provided in an embodiment of the present disclosure;
fig. 2 is a flowchart of a circuit detection method for assisting three-phase output of an inverter according to an embodiment of the present disclosure;
fig. 3 is a logic diagram for determining overload, short circuit, and open phase of the auxiliary circuit according to an embodiment of the disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
An embodiment of the present disclosure first provides a circuit detection system for assisting three-phase output of an inverter, as shown in fig. 1, the circuit detection system including: the system comprises an auxiliary inverter module, a voltage detection module and a current detection module, wherein the auxiliary inverter module comprises a three-phase circuit; the voltage detection module comprises a three-phase rectifier bridge unit and a single-phase voltage sensor, the three-phase rectifier bridge unit is connected with the three-phase circuit, the single-phase voltage sensor is connected with the three-phase rectifier bridge unit, and the single-phase voltage sensor can acquire an actual voltage value of the auxiliary inverter; the current detection module comprises a plurality of current transformers and a three-phase current detection unit, and the plurality of current transformers are respectively arranged corresponding to the three-phase circuit; one ends of the current transformers are grounded, and the other ends of the current transformers are connected with the three-phase current detection unit; the actual current value of the auxiliary inverter can be obtained by the three-phase current detection unit.
According to the circuit detection system for assisting the three-phase output of the inverter, the current transformer of the current detection module is adopted to replace a complex Hall current sensor, so that the output detection of three-phase current is realized; a three-phase rectifier bridge of the current detection module and a circuit of a single-phase voltage sensor are adopted to replace the circuits of three single-phase voltage sensors, so that the function of three-phase voltage detection is realized. Hardware circuits in the detection system are relatively reduced, the function of detecting the voltage and the current of the inverter is realized, and the effects of cost reduction and efficiency improvement are realized.
Specifically, the circuit detection system for three-phase output of the auxiliary inverter provided by this example is a detection and control method for a three-phase inverter for an auxiliary circuit of an electric locomotive, the auxiliary inverter mainly supplies power to an auxiliary current of the locomotive, the inverter operates under a variable frequency condition, according to an operation condition of the locomotive, the inverter operates at three frequency points, namely 25HZ, 40HZ and 50HZ, the inverter adopts a control mode of a constant voltage frequency ratio, and the operating voltage at each frequency point is 190V, 304V and 380V.
Specifically, the inverter voltage detection system provided in this example adopts a detection mode of a rectifier bridge and a single-phase voltage sensor to realize detection control of three-phase voltage. The three-phase output voltage of the inverter is rectified into direct current voltage through a three-phase rectifier bridge, a single-phase voltage value is collected through a single-phase direct current voltage sensor, the collected voltage value is fed back to the control unit, the control unit carries out logical operation, and collection of the output voltage is achieved, and the specific schematic diagram of the three-phase output voltage is shown in attached figure 1.
Specifically, the inverter current detection system provided in this example employs a manner in which three current transformers are added to a current detection acquisition board to achieve detection control of three-phase output currents, each phase of output current is converted into a current range that can be acquired by a control loop according to a specific proportion by the current transformers, rectification of the three-phase output currents is achieved by a rectification circuit and a sampling resistor in the current detection acquisition board, and then the three-phase output currents are sent to a control unit, and the control unit performs logical operation to achieve acquisition of the output currents, and a specific schematic diagram of the inverter current detection system is shown in fig. 1.
The circuit detection system for three-phase output of the auxiliary inverter provided in this example needs the control unit to complete sampling, logic judgment, fault identification, circuit protection and logic control of feedback data, and complete protection of overload, overvoltage, short circuit and open phase of the auxiliary circuit, and specific logic protection of the circuit detection system is shown in fig. 3.
In one embodiment of the present disclosure, the circuit detection system further includes: and a frequency acquisition module. The frequency acquisition module is connected with the auxiliary inverter module and is used for acquiring the actual working frequency of the auxiliary inverter module.
In one embodiment of the present disclosure, the circuit detection system further includes: and a control module. The control module is connected with the frequency acquisition module, the voltage detection module and the current detection module, determines a theoretical voltage output value according to the acquired actual working frequency and judges whether the actual voltage value acquired by the voltage detection module is the same as the theoretical voltage output value or not; if the current values are the same, judging whether the actual current value obtained by the current detection module is larger than a current threshold value; and if the current is larger than the current threshold, judging that the output of the auxiliary inverter is overloaded.
The frequency acquisition module and the control module can be two independent modules, and the frequency acquisition module can also belong to one part of the control module, namely the control module can finish the acquisition of the actual working frequency of the auxiliary inverter module.
For example, if the actual voltage value obtained by the voltage detection module is determined to be the same as the theoretical voltage output value, and the actual current value obtained by the current detection module is determined to be less than or equal to the current threshold, it is determined that the output of the auxiliary inverter is normal.
For example, if the control module determines that the actual voltage value obtained by the voltage detection module is less than one third of the theoretical voltage output value and determines that the actual current value obtained by the current detection module is greater than the set current threshold, it is determined that the auxiliary inverter outputs a short circuit.
For example, if the control module determines that the actual voltage value obtained by the voltage detection module is greater than one third of the theoretical voltage output value and less than three quarters of the theoretical voltage output value, it determines that the auxiliary inverter outputs a phase failure. The output open-phase detection of the auxiliary inverter is identified and judged by adopting a three-phase output voltage detection mode, and the purpose of accurately positioning the output open-phase is achieved by setting a special detection threshold value.
For example, if the control module determines that the actual voltage value obtained by the voltage detection module is greater than the theoretical voltage output value, it determines that the auxiliary inverter outputs overvoltage.
The auxiliary control unit detects the output voltage and the output current, and the purpose of accurately positioning and identifying the fault is achieved by identifying the output frequency of the inverter at the fault moment and logically comparing the theoretical value of the voltage at the frequency point with an actual sampling value.
An embodiment of the present disclosure also provides a circuit detection method for assisting three-phase output of an inverter, as shown in fig. 2, the circuit detection method includes:
step S100, providing an auxiliary inverter module, wherein the auxiliary inverter module comprises a three-phase circuit;
step S200, providing a voltage detection module, wherein the voltage detection module comprises a three-phase rectifier bridge unit and a single-phase voltage sensor, the three-phase rectifier bridge unit is connected with a three-phase circuit, the single-phase voltage sensor is connected with the three-phase rectifier bridge unit, and the single-phase voltage sensor is used for acquiring the actual voltage value of the auxiliary inverter;
step S300, providing a current detection module, wherein the current detection module comprises a plurality of current transformers and a three-phase current detection unit, and the plurality of current transformers are respectively arranged corresponding to the three-phase circuit; one ends of the current transformers are grounded, and the other ends of the current transformers are connected with the three-phase current detection unit; and acquiring the actual current value of the auxiliary inverter through a three-phase current detection unit.
According to the circuit detection method for assisting the three-phase output of the inverter, the current transformer of the current detection module is adopted to replace a complex Hall current sensor, so that the output detection of three-phase current is realized; a three-phase rectifier bridge of the current detection module and a circuit of a single-phase voltage sensor are adopted to replace the circuits of three single-phase voltage sensors, so that the function of three-phase voltage detection is realized. Hardware circuits in the detection system are relatively reduced, the function of detecting the voltage and the current of the inverter is realized, and the effects of cost reduction and efficiency improvement are realized.
Specifically, the circuit detection method further includes: providing a frequency acquisition module, wherein the frequency acquisition module is connected with the auxiliary inverter module and is used for acquiring the actual working frequency of the auxiliary inverter module; providing a control module which is connected with the frequency acquisition module, the voltage detection module and the current detection module; determining a theoretical voltage output value through the control module according to the adopted actual working frequency, and judging whether the actual voltage value acquired by the voltage detection module is the same as the theoretical voltage output value or not; if the current values are the same, judging whether the actual current value obtained by the current detection module is larger than a current threshold value; and if the current is larger than the current threshold, judging that the output of the auxiliary inverter is overloaded.
And if the actual voltage value acquired by the voltage detection module is judged to be larger than the theoretical voltage output value, judging that the auxiliary inverter outputs overvoltage.
And if the actual voltage value acquired by the voltage detection module is the same as the theoretical voltage output value and the actual current value acquired by the current detection module is less than or equal to the current threshold value, judging that the output of the auxiliary inverter is normal.
Specifically, the circuit detection method further includes: and if the control module judges that the actual voltage value acquired by the voltage detection module is less than one third of the theoretical voltage output value and judges that the actual current value acquired by the current detection module is greater than the set current threshold value, judging that the auxiliary inverter outputs a short circuit.
Specifically, the circuit detection method further includes: and if the control module judges that the actual voltage value acquired by the voltage detection module is greater than one third of the theoretical voltage output value and less than three quarters of the theoretical voltage output value, judging that the auxiliary inverter outputs the open phase.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the invention. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiment of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiment of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A circuit detection system for assisting a three-phase output of an inverter, comprising:
an auxiliary inverter module including a three-phase circuit;
the voltage detection module comprises a three-phase rectifier bridge unit and a single-phase voltage sensor, the three-phase rectifier bridge unit is connected with the three-phase circuit, the single-phase voltage sensor is connected with the three-phase rectifier bridge unit, and the single-phase voltage sensor can acquire an actual voltage value of the auxiliary inverter;
the current detection module comprises a plurality of current transformers and a three-phase current detection unit, and the plurality of current transformers are respectively arranged corresponding to the three-phase circuit; one ends of the current transformers are grounded, and the other ends of the current transformers are connected with the three-phase current detection unit; the actual current value of the auxiliary inverter can be obtained by the three-phase current detection unit.
2. The circuit detection system of claim 1, further comprising:
and the frequency acquisition module is connected with the auxiliary inverter module and is used for acquiring the actual working frequency of the auxiliary inverter module.
3. The circuit detection system of claim 2, further comprising:
the control module is connected with the frequency acquisition module, the voltage detection module and the current detection module, determines a theoretical voltage output value according to the acquired actual working frequency, and judges whether the actual voltage value acquired by the voltage detection module is the same as the theoretical voltage output value or not; if the current values are the same, judging whether the actual current value obtained by the current detection module is larger than a set current threshold value; and if the current is larger than the current threshold, judging that the output of the auxiliary inverter is overloaded.
4. The circuit detection system according to claim 3, wherein if the current is less than or equal to the current threshold, the auxiliary inverter output is determined to be normal.
5. The circuit detection system of claim 3, further comprising:
and if the control module judges that the actual voltage value acquired by the voltage detection module is less than one third of the theoretical voltage output value and judges that the actual current value acquired by the current detection module is greater than a set current threshold value, judging that the output of the auxiliary inverter is short-circuited.
6. The circuit detection system of claim 3, further comprising:
and if the control module judges that the actual voltage value acquired by the voltage detection module is greater than one third of the theoretical voltage output value and less than three quarters of the theoretical voltage output value, judging that the auxiliary inverter outputs a phase failure.
7. A circuit detection method for assisting three-phase output of an inverter is characterized by comprising the following steps:
providing an auxiliary inverter module comprising a three-phase circuit;
providing a voltage detection module, wherein the voltage detection module comprises a three-phase rectifier bridge unit and a single-phase voltage sensor, the three-phase rectifier bridge unit is connected with the three-phase circuit, the single-phase voltage sensor is connected with the three-phase rectifier bridge unit, and the single-phase voltage sensor is used for acquiring the actual voltage value of the auxiliary inverter;
providing a current detection module, wherein the current detection module comprises a plurality of current transformers and a three-phase current detection unit, and the plurality of current transformers are respectively arranged corresponding to the three-phase circuit; one ends of the current transformers are grounded, and the other ends of the current transformers are connected with the three-phase current detection unit; and acquiring the actual current value of the auxiliary inverter through the three-phase current detection unit.
8. The circuit detection method of claim 7, further comprising:
providing a frequency acquisition module, wherein the frequency acquisition module is connected with the auxiliary inverter module and is used for acquiring the actual working frequency of the auxiliary inverter module;
providing a control module which is connected with the frequency acquisition module, the voltage detection module and the current detection module; determining a theoretical voltage output value according to the adopted actual working frequency through the control module, and judging whether the actual voltage value acquired by the voltage detection module is the same as the theoretical voltage output value or not;
if the current values are the same, judging whether the actual current value obtained by the current detection module is larger than a set current threshold value; and if the current is larger than the current threshold, judging that the output of the auxiliary inverter is overloaded.
9. The circuit detection method of claim 8, further comprising:
and if the control module judges that the actual voltage value acquired by the voltage detection module is less than one third of the theoretical voltage output value and judges that the actual current value acquired by the current detection module is greater than a set current threshold value, judging that the output of the auxiliary inverter is short-circuited.
10. The circuit detection method of claim 8, further comprising:
and if the control module judges that the actual voltage value acquired by the voltage detection module is greater than one third of the theoretical voltage output value and less than three quarters of the theoretical voltage output value, judging that the auxiliary inverter outputs a phase failure.
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Citations (7)
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