CN110568295A - AC/DC load fault detection circuit and detection method thereof - Google Patents
AC/DC load fault detection circuit and detection method thereof Download PDFInfo
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- CN110568295A CN110568295A CN201910938933.8A CN201910938933A CN110568295A CN 110568295 A CN110568295 A CN 110568295A CN 201910938933 A CN201910938933 A CN 201910938933A CN 110568295 A CN110568295 A CN 110568295A
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- 238000001514 detection method Methods 0.000 title claims abstract description 57
- 238000013500 data storage Methods 0.000 claims abstract description 37
- 230000002159 abnormal effect Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 28
- 230000005611 electricity Effects 0.000 claims description 12
- 230000005856 abnormality Effects 0.000 claims description 5
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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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
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses an alternating current and direct current load fault detection circuit and a detection method thereof. The circuit comprises a first current transformer, a second current transformer and a power measuring unit. The method comprises the following steps: when a fault occurs, the data storage unit receives current power data; comparing the current power data with the stored power data received last time; when the current power data is different from the power data received last time and the main control unit does not send new working mode information, receiving direct current output current data of the switching power supply; comparing the received dc output current data with reference dc current data; if there is a deviation from the reference dc current data, the dc load is abnormal. If there is no deviation, the AC load is abnormal. The circuit and the method monitor whether the working state of the alternating current load or the direct current load is normal or not, solve the problem that the alternating current load is difficult to detect the working abnormal state, can detect the fault in real time when the load works, and improve the working safety and reliability of the whole machine.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an alternating current/direct current load fault detection circuit and a detection method thereof.
Background
international publication WO2017064632a1 discloses an ac load detection circuit based on a photo-coupler, which discloses only a method of photo-electric switching and detects only an ac load.
disclosure of Invention
The invention aims to provide an alternating current and direct current load fault detection circuit and a detection method thereof, which can detect alternating current load faults and direct current load faults.
in order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, the invention provides an ac/dc load fault detection circuit. The AC/DC load fault detection circuit comprises: the power measurement device comprises a first current transformer, a second current transformer, a power measurement unit, a data storage unit and a main control unit, wherein the first current transformer is connected with one side coil in series between an alternating current commercial power supply and an alternating current load of a switching power supply module, the second current transformer is led out of the switching power supply module from one side coil, the power measurement unit is connected with the other side coil of the first current transformer, the data storage unit is connected with the other side coil of the second current transformer, and the main control unit is connected with the data storage unit which is connected with the power measurement unit.
optionally, for the ac/dc load fault detection circuit, the power measurement unit includes a power meter and/or an electricity meter.
optionally, for the ac/dc load fault detection circuit, the data storage unit includes an operational amplifier unit integrated with stored data.
Optionally, for the ac/dc load fault detection circuit, the data storage unit stores the measured power received from the power measurement unit at different times in each operating mode category.
Optionally, for the ac/dc load fault detection circuit, the data storage unit includes reference dc current data stored in each operating mode class.
Optionally, for the ac/dc load fault detection circuit, each operation mode is represented by a different operation mode code.
On the other hand, a detection method of the alternating current/direct current load fault detection circuit is provided. The detection method comprises the following steps: when a fault occurs, the data storage unit receives current power data measured by the power measurement unit; comparing the current power data with the stored power data received last time; when the current power data is different from the power data received last time and the main control unit does not send new working mode information, receiving direct current output current data of the switching power supply detected by the second current transformer; comparing the received DC output current data of the switching power supply with reference DC data; if the DC output current data has deviation with the reference DC data, judging that the DC load is abnormal; and if the direct current output current data is not deviated from the reference current data, judging that the alternating current load is abnormal.
Optionally, the detection method of the ac/dc load fault detection circuit further includes: in normal operation, the data storage unit receives current power data measured by the power measurement unit; receiving working mode information and reference direct current data of the working mode from a main control unit; current power data is stored in the received class of operating mode.
Optionally, for the detection method of the ac/dc load fault detection circuit, when the power measurement unit includes a coulometer, the receiving, by the data storage unit, the current power data measured by the power measurement unit includes: receiving current electric quantity data measured by an electric quantity meter; and counting according to the current electric quantity data to obtain the electric quantity data in unit time, namely the current power data.
optionally, the detection method of the ac/dc load fault detection circuit further includes: when the direct current load is judged to be abnormal, the main control unit displays a fault code of the direct current load abnormality; and when the AC load is judged to be abnormal, the main control unit displays the fault code of the abnormal AC load.
compared with the prior art, the technical scheme of the invention has the following main advantages:
the alternating current and direct current load fault detection circuit and the detection method thereof in the embodiment of the invention monitor whether the working state of the alternating current or direct current load is normal or not by adding the power measurement unit and the two current transformers to detect the working power and the working current. The problem that the AC load is difficult to detect abnormal working states such as open circuit, short circuit and failure in place is solved, the load can detect faults in real time when working, and the working safety and reliability of the whole machine are improved.
The alternating current/direct current load fault detection circuit and the detection method thereof of the embodiment of the invention judge whether the alternating current or direct current load has a fault or not by detecting the size of the input power and comparing the input power with the normal working power in the working mode (working state) at the moment. If the working state of the load is normal, the detection circuit collects normal data and stores the normal data in a local memory; if the working state of the load is abnormal, the detection circuit collects abnormal data, compares the abnormal data with normal data in the local memory and sends a load abnormal signal to the main control chip. The main control chip can further display fault codes or fault prompts, and intellectualization and user experience are improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
Fig. 1 is a schematic structural diagram of an ac/dc load fault detection circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of a detection method of an ac/dc load fault detection circuit according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 is a schematic structural diagram of an ac/dc load fault detection circuit according to an embodiment of the present invention. As shown in fig. 1, the ac/dc load fault detection circuit provided in this embodiment includes a first current transformer 140 having a coil on one side connected in series between the ac mains 110 and the ac load 130 of the switching power supply module 120, a second current transformer 150 having a coil on one side led out from the switching power supply module 120, a power measurement unit 160 connected to a coil on the other side of the first current transformer 140, a data storage unit 170 connected to a coil on the other side of the second current transformer 150, and a main control unit 180, where the main control unit 180 is connected to the data storage unit 170, and the data storage unit 170 is connected to the power measurement unit 160. The ac/dc load fault detection circuit further includes a dc load connected to the output terminal of the switching power supply module 120.
The power measurement unit 160 may include a power meter and/or an electricity meter. The power meter can be replaced by an electricity meter, the electricity meter calculates the electricity quantity during working, the electricity quantity Q is power P times T, the electricity quantity within a certain time can represent the success rate, and if the electricity meter is used, the electricity quantity data of the electricity quantity within unit time after a period of subsequent measurement is the power data. The access position of the electricity meter is the same as that of the power meter.
The data storage unit 170 may include an operational amplifier unit integrated with stored data, and may store data at a previous time or compare data at a next time with data at a previous time.
the data storage unit 170 may include a memory for storing the measured power received from the power measurement unit at different times in each operating mode class. The data storage unit 170 may include reference dc current data stored in each operation mode class. Each mode of operation may be represented by a different mode code of operation. The measured powers received at different times in each operating mode category may be stored in order of the reception time from morning to evening. For example, the data storage unit 170 stores the operating powers of the different operating modes in the operating mode codes respectively, in one way as follows:
Operating mode a 1: power 1, power 2, power 3 … …;
operating mode a 2: power 1, power 2, power 3 … …;
…。
The working mode of each machine is different for different working modes, and the working power is different as long as the load is different and the working mode is different. In the above example, "power 1, power 2, and power 3 … …" refer to power data at different times.
Fig. 2 is a flowchart of a detection method of an ac/dc load fault detection circuit according to another embodiment of the present invention.
As shown in fig. 2, in step S210, the data storage unit receives the current power data measured by the power measurement unit when a fault occurs. When the machine is in failure, the data storage unit receives abnormal working power of the machine detected by the first current transformer and the power measurement unit.
In step S220, the current power data is compared with the stored power data received last time.
In step S230, when the current power data is different from the previously received power data and the main control unit does not transmit new operation mode information, the dc output current data of the switching power supply detected by the second current transformer is received. And comparing the power data with the stored power data received last time, wherein the main control unit does not send new working mode information, and the data storage unit receives the direct current output current of the switching power supply detected by the second current transformer.
In step S240, the received dc output current data of the switching power supply is compared with the reference dc current data. If the dc output current data is deviated from the reference dc current data, the flow proceeds to step S250. If the dc output current data does not deviate from the reference dc current data, the flow proceeds to step S260.
In step S250, it is determined that the dc load is abnormal.
In step S260, it is determined that the ac load is abnormal.
the detection method of the ac/dc load fault detection circuit of this embodiment may further include the steps of: in normal operation, the data storage unit receives current power data measured by the power measurement unit; receiving working mode information and reference direct current data of the working mode from a main control unit; current power data is stored in the received class of operating mode.
when the machine normally runs, the data storage unit does not receive the direct current output current of the switching power supply detected by the second current transformer. The second current transformer can be a current transformer LMZJ1-0.5300/5A, and the specific parameters are as follows: the current ratio is 300/5, and the secondary side direct current resistance is 120m omega. The first current transformer and the power measuring unit detect the working power of the machine, the data storage unit receives power data detected by the power measuring unit, and the data storage unit compares the power data with stored power data received last time. The main control unit sends the current working mode information to the data storage unit, and the reference direct current data of each working mode is also sent to the data storage unit. When the user switches the working mode, the main control chip obtains different reference current data.
When the power measuring unit includes a power meter, the receiving, by the data storage unit, the current power data measured by the power measuring unit may include: receiving current electric quantity data measured by an electric quantity meter; and counting according to the current electric quantity data to obtain the electric quantity data in unit time, namely the current power data.
When the direct current load is judged to be abnormal, the main control unit displays a fault code of the direct current load abnormality to prompt a user of the abnormality; and when the AC load is judged to be abnormal, the main control unit displays a fault code of the abnormal AC load to prompt the user of the abnormality.
The alternating current and direct current load fault detection circuit and the detection method thereof in the embodiment of the invention monitor whether the working state of the alternating current or direct current load is normal or not by adding the power measurement unit and the two current transformers to detect the working power and the working current. The problem that the AC load is difficult to detect abnormal working states such as open circuit, short circuit and failure in place is solved, the load can detect faults in real time during working, and the safety and reliability of the whole machine are improved.
The alternating current/direct current load fault detection circuit and the detection method thereof of the embodiment of the invention judge whether the alternating current or direct current load has a fault or not by detecting the size of the input power and comparing the input power with the normal working power in the working mode (working state) at the moment. If the working state of the load is normal, the detection circuit collects normal data and stores the normal data in a local memory; if the working state of the load is abnormal, the detection circuit collects abnormal data, compares the abnormal data with normal data in the local memory and sends a load abnormal signal to the main control chip. The main control chip can further display fault codes or fault prompts, and intellectualization and user experience are improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the claims, and all equivalent structures or equivalent processes that are transformed by the content of the specification and the drawings, or directly or indirectly applied to other related technical fields are included in the scope of the claims.
Claims (10)
1. An ac/dc load fault detection circuit, comprising: the power measurement device comprises a first current transformer, a second current transformer, a power measurement unit, a data storage unit and a main control unit, wherein the first current transformer is connected with one side coil in series between an alternating current commercial power supply and an alternating current load of a switching power supply module, the second current transformer is led out of the switching power supply module from one side coil, the power measurement unit is connected with the other side coil of the first current transformer, the data storage unit is connected with the other side coil of the second current transformer, and the main control unit is connected with the data storage unit which is connected with the power measurement unit.
2. The ac/dc load fault detection circuit of claim 1, wherein the power measurement unit comprises a power meter and/or an electricity meter.
3. The ac-dc load fault detection circuit of claim 1, wherein the data storage unit comprises an integrated data storage op-amp unit.
4. The ac-dc load fault detection circuit of claim 1, wherein the data storage unit includes a memory for storing the measured power received from the power measurement unit at different times for each of the operating mode classes.
5. The ac-dc load fault detection circuit of claim 1, wherein the data storage unit includes reference dc current data stored in each operating mode class.
6. The ac-dc load fault detection circuit of claim 4 or 5, wherein each operating mode is represented by a different operating mode code.
7. A detection method of the AC/DC load fault detection circuit according to any one of claims 1-6, comprising:
When a fault occurs, the data storage unit receives current power data measured by the power measurement unit;
comparing the current power data with the stored power data received last time;
When the current power data is different from the power data received last time and the main control unit does not send new working mode information, receiving direct current output current data of the switching power supply detected by the second current transformer;
comparing the received DC output current data of the switching power supply with reference DC data;
If the DC output current data has deviation with the reference DC data, judging that the DC load is abnormal;
and if the direct current output current data is not deviated from the reference current data, judging that the alternating current load is abnormal.
8. The method of claim 7, further comprising:
In normal operation, the data storage unit receives current power data measured by the power measurement unit;
Receiving working mode information and reference direct current data of the working mode from a main control unit;
Current power data is stored in the received class of operating mode.
9. the method according to claim 7, wherein when the power measuring unit includes a coulometer, the receiving the current power data measured by the power measuring unit by the data storage unit includes:
Receiving current electric quantity data measured by an electric quantity meter;
And counting according to the current electric quantity data to obtain the electric quantity data in unit time, namely the current power data.
10. The method of claim 7, further comprising:
When the direct current load is judged to be abnormal, the main control unit displays a fault code of the direct current load abnormality;
And when the AC load is judged to be abnormal, the main control unit displays the fault code of the abnormal AC load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910938933.8A CN110568295B (en) | 2019-09-30 | 2019-09-30 | AC/DC load fault detection circuit and detection method thereof |
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| CN201910938933.8A CN110568295B (en) | 2019-09-30 | 2019-09-30 | AC/DC load fault detection circuit and detection method thereof |
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| CN110568295B CN110568295B (en) | 2024-03-15 |
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