CN110907800A - Inverter power supply voltage detection circuit fault diagnosis method and system based on voltage judgment - Google Patents
Inverter power supply voltage detection circuit fault diagnosis method and system based on voltage judgment Download PDFInfo
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- CN110907800A CN110907800A CN201911076679.1A CN201911076679A CN110907800A CN 110907800 A CN110907800 A CN 110907800A CN 201911076679 A CN201911076679 A CN 201911076679A CN 110907800 A CN110907800 A CN 110907800A
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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
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
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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
- G01R31/40—Testing power supplies
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Abstract
The invention discloses a method and a system for diagnosing faults of an inverter power supply voltage detection circuit based on voltage judgment, wherein the method comprises the following steps of periodically repeating: judging whether the measured voltage value lasts for a preset time within a preset interval, if so, executing the next step, and otherwise, determining that the voltage detection circuit is normal; and judging whether the inverter power supply operates under the current-limiting working condition, if so, determining that the voltage detection circuit is normal, and otherwise, determining that the voltage detection circuit is open. The system comprises an inverter power supply main circuit, a voltage detection circuit, a driving circuit and a control circuit, wherein the control circuit comprises a controller and a voltage judgment module.
Description
Technical Field
The invention belongs to the field of inverter power supplies, and particularly relates to a voltage judgment-based inverter power supply voltage detection circuit fault diagnosis method and system.
Background
As the application of power supplies is becoming more widespread, people have also made higher demands on the safety of power supplies. Once the inverter fails, the output voltage, the output current and the like are affected, so that a system where the inverter is located cannot work normally, and if the failure of the inverter is not found and processed in time, the inverter is easily damaged, even disastrous accidents can be caused, and huge loss is caused. The detection circuit is used as a feedback link of a closed-loop control system, and faults of the detection circuit can influence the control circuit to read a correct state, so that an error control signal is sent, the inverter power supply is unreliable, the output voltage is possibly rapidly increased, and further the load or the inverter power supply is damaged.
The existing research aiming at the fault diagnosis of the inverter power supply almost focuses on the fault diagnosis research of the driving tube, and the fault of the voltage detection circuit is usually realized through the hardware redundancy of the sensor, so that the extra cost is required to be added. Furthermore, generally, the transformer or sensor required by the voltage detection device is large in size, and the size of the inverter power supply is also increased due to hardware redundancy.
From the above analysis, the diagnosis method for the inverter power supply voltage detection circuit fault is basically realized through hardware redundancy, and there is no good diagnosis method in a software level. The hardware redundancy method has the defects of increasing the cost and increasing the volume of the inverter power supply. Therefore, it is necessary to provide a fault diagnosis method for a voltage detection circuit in software.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method and a system for diagnosing the fault of the voltage detection circuit of the inverter power supply based on voltage judgment, and aims to overcome the defects that the cost is increased and the size of the inverter power supply is increased in the conventional method for realizing the fault diagnosis of the voltage detection circuit through hardware redundancy.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for diagnosing a fault of an inverter power supply voltage detection circuit based on voltage judgment, including the steps of:
(1) judging whether the measured voltage value lasts for a preset time within a preset interval, if so, executing the step (2), otherwise, determining that the voltage detection circuit is normal;
(2) judging whether the inverter power supply operates under a current-limiting working condition, if so, determining that the voltage detection circuit is normal, and otherwise, determining that the voltage detection circuit is open-circuited;
(3) repeating the steps (1) to (2) periodically.
Preferably, the size of the preset interval in the step (1) is generally 1.1 to 1.3 times of the measurement error of the voltage detection circuit.
Preferably, the preset time in step (1) is
Where T is the period of the output ac voltage.
Preferably, the current limiting condition in step (2) is characterized by a decrease in output voltage (possibly maintained at zero for a period of time) to limit the magnitude of output current.
Preferably, the step (2) and the step (2) are implemented by directly reading the state variable from the controller.
According to another aspect of the invention, a voltage judgment-based inverter power supply voltage detection circuit fault diagnosis system is provided, which comprises an inverter power supply main circuit, a voltage detection circuit, a drive circuit and a control loop, wherein the control loop comprises a controller and a voltage judgment module; the output of the main inverter power supply circuit is connected with the input of the voltage detection circuit, the output of the voltage detection circuit is connected with the input of the control loop, the output of the control loop is connected with the input of the drive circuit, and the drive circuit outputs a switching tube control signal to control the main inverter power supply circuit.
Preferably, the voltage judging module judges whether a fault occurs according to the measured voltage signal, and transmits the result to the controller to control the inverter power supply.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the inverter power supply voltage detection circuit fault diagnosis method based on the modulation wave provided by the invention can ensure the safe operation of the system on the original inverter power supply only by modifying a software program without additionally adding hardware devices, thereby reducing the cost and being simple to realize;
2. the inverter power supply voltage detection circuit fault diagnosis method based on the modulation wave has the advantages of less calculation amount, less occupied controller resources and no influence on the performance of the inverter power supply;
3. the inverter power supply voltage detection circuit fault diagnosis method based on the modulation wave can generally use the same set of preset parameters for different inverter power supplies, or can meet the use requirement only by simply adjusting the preset time and the preset interval in the judgment process, and the adjustment workload is small;
4. the inverter power supply voltage detection circuit fault diagnosis method based on the modulation wave provided by the invention finishes fault judgment by reading the voltage value measured in real time and combining with the operation state of the inverter power supply, only needs to set an extremely short time threshold value to avoid misoperation, has very high response speed, and can well inhibit overvoltage possibly generated after the fault occurs.
Drawings
Fig. 1 is a schematic structural diagram of an inverter power supply according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for diagnosing a fault of a voltage detection circuit of an inverter power supply according to an embodiment of the present invention;
fig. 3 is an effect diagram of the method for diagnosing the fault of the voltage detection circuit of the inverter power supply according to the embodiment of the present invention.
The attached drawings are marked as follows:
1. the device comprises an inverter power supply main circuit 2, a voltage detection circuit 3, a drive circuit 4, a control circuit 41, a controller 42 and a voltage judgment module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a voltage-judgment-based inverter power supply voltage detection circuit fault diagnosis method aiming at the defects of the existing voltage detection circuit fault diagnosis technology, and solves the problems of increased cost and increased inverter power supply volume caused by fault diagnosis through hardware redundancy.
To further explain the inverter power supply voltage detection circuit fault diagnosis method based on modulation wave provided by the embodiment of the invention, the following is detailed with reference to the accompanying drawings and the embodiment:
the principle of the invention for realizing fault judgment is as follows: the inverter power supply controls the switching behavior of the driving tube through the controller, and converts the input direct-current voltage into alternating-current voltage for output. Under the normal operation condition, the output alternating voltage is far larger than zero, so that the inverter power supply is operated under the abnormal condition when the measured alternating voltage is in an interval near zero for a period of time. However, such abnormal conditions also include a current limiting condition, which is not a fault. Therefore, when the output voltage is about zero and the current-limiting working condition is not operated, the fault of the voltage detection circuit can be judged.
FIG. 1 shows a block diagram of an inverter power system, wherein UdcFor input of a direct voltage, UacFor outputting an effective value of the alternating voltage, also the input voltage of the voltage detection circuit, UmIs the output voltage of the voltage detection circuit, SfFor the fault diagnosis module to process the result, there are two states of normal and fault, UpwmPwm control signal, S, for the output of the control looppwmAnd the switch tube control signal is output by the driving circuit. Generally speaking, Um＝kUacWherein k is a scaling factor determined by the specific voltage detection loop. As can be seen from the figure, the voltage detection circuit 2 transmits the measured voltage to the control loop 4, and the modulation wave judgment module 42 judges the voltage signal according to the measured voltageUmWhether the fault occurs or not is obtained, and a processing result S is obtainedfAnd the voltage is transmitted to the controller 41, and the inverter voltage is controlled by the controller.
Fig. 2 is a flow chart showing a fault diagnosis method for a voltage detection circuit of the inverter power supply, which periodically executes the following steps:
(1) judging whether the measured voltage value lasts for a preset time within a preset interval, if so, executing the step (2), otherwise, determining that the voltage detection circuit is normal;
(2) judging whether the inverter power supply operates under a current-limiting working condition, if so, determining that the voltage detection circuit is normal, and otherwise, determining that the voltage detection circuit is open-circuited;
(3) repeating the steps (1) to (2) periodically.
Specifically, the size of the preset interval in the step (1) is 1.1-1.3 times of the measurement error of the voltage detection circuit.
Specifically, the preset time in the step (1) is
Where T is the period of the output ac voltage.
Fig. 3 shows the action effect waveform of the proposed diagnosis method in case of the fault of the voltage detection circuit. It can be seen that the diagnostic method acts rapidly within a very short time after the fault occurs, causing the inverter to shut down rapidly, terminating the process of rapid voltage rise after the fault. The action time is about 1ms, so the dynamic response is very quick, the overvoltage and the overcurrent can be well avoided, and the function of protecting the inverter power supply and the load is realized.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A voltage judgment based inverter power supply voltage detection circuit fault diagnosis method is characterized by comprising the following steps:
(1) judging whether the measured voltage value lasts for a preset time within a preset interval, if so, executing the step (2), otherwise, determining that the voltage detection circuit is normal;
(2) judging whether the inverter power supply operates under a current-limiting working condition, if so, determining that the voltage detection circuit is normal, and otherwise, determining that the voltage detection circuit is open-circuited;
(3) repeating the steps (1) to (2) periodically.
2. The method for diagnosing circuit fault according to claim 1, wherein the predetermined interval in step (1) is 1.1 to 1.3 times the measurement error of the voltage detection circuit.
3. The circuit failure diagnosis method according to claim 1, wherein the preset time in step (1) is
Where T is the period of the output ac voltage.
4. The method of claim 1, wherein the current limiting condition in step (2) is characterized by a decrease in output voltage to limit the magnitude of output current.
5. The circuit fault diagnosis method according to claim 1, wherein the determination of whether to operate in the current limiting condition in step (2) is performed by directly reading the state variable from the controller.
6. The inverter power supply voltage detection circuit fault diagnosis system based on voltage judgment is characterized by comprising an inverter power supply main circuit, a voltage detection circuit, a drive circuit and a control loop, wherein the control loop comprises a controller and a voltage judgment module;
the output of the main inverter power supply circuit is connected with the input of the voltage detection circuit, the output of the voltage detection circuit is connected with the input of the control circuit, the output of the control circuit is connected with the input of the drive circuit, and the drive circuit outputs a switching tube control signal to control the main inverter power supply circuit.
7. The circuit fault diagnosis system according to claim 6, wherein the voltage determination module determines whether a fault occurs according to the measured voltage signal, and transmits the result to the controller to control the inverter.
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| CN201911076679.1A CN110907800B (en) | 2019-11-06 | 2019-11-06 | Inverter power supply voltage detection circuit fault diagnosis method and system based on voltage judgment |
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| CN201911076679.1A CN110907800B (en) | 2019-11-06 | 2019-11-06 | Inverter power supply voltage detection circuit fault diagnosis method and system based on voltage judgment |
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| CN110907800B CN110907800B (en) | 2021-04-06 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104765012A (en) * | 2015-04-21 | 2015-07-08 | 阳光电源股份有限公司 | Fault detection method, fault detection circuit and inverter |
| CN206135740U (en) * | 2016-09-28 | 2017-04-26 | 深圳市盈动力科技有限公司 | Power limitation circuit and inverter of inverter |
| CN107437792A (en) * | 2016-05-27 | 2017-12-05 | 乐星产电(无锡)有限公司 | Guard method, device and its frequency converter of frequency converter charging circuit |
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- 2019-11-06 CN CN201911076679.1A patent/CN110907800B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104765012A (en) * | 2015-04-21 | 2015-07-08 | 阳光电源股份有限公司 | Fault detection method, fault detection circuit and inverter |
| CN107437792A (en) * | 2016-05-27 | 2017-12-05 | 乐星产电(无锡)有限公司 | Guard method, device and its frequency converter of frequency converter charging circuit |
| CN206135740U (en) * | 2016-09-28 | 2017-04-26 | 深圳市盈动力科技有限公司 | Power limitation circuit and inverter of inverter |
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