CN115047370A - Method for detecting state of switching power supply - Google Patents
Method for detecting state of switching power supply Download PDFInfo
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- CN115047370A CN115047370A CN202210571672.2A CN202210571672A CN115047370A CN 115047370 A CN115047370 A CN 115047370A CN 202210571672 A CN202210571672 A CN 202210571672A CN 115047370 A CN115047370 A CN 115047370A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 104
- 238000003466 welding Methods 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 5
- 238000012797 qualification Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
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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
Abstract
The invention discloses a method for detecting the state of a switching power supply, which comprises the steps of connecting a direct-current stabilized power supply to the input end of the switching power supply, and providing weak current for detection by using the direct-current stabilized power supply; the output end of the switching power supply is connected with a voltage detection device and a current detection device, and the voltage detection device and the current detection device respectively detect the output voltage and the output current of the switching power supply; detecting the working temperature of the switching power supply by using a temperature detection device; and judging the state of the switching power supply according to the output voltage, the output current and the working temperature. According to the invention, by setting the output parameter of the direct current stabilized power supply, a weak current power supply is provided for a detected product, a circuit of the product forms a loop to complete self-checking, and the working temperature is detected by the thermal infrared imager, so that the switch power supply is comprehensively, quickly and uniformly detected in a standard state, and the problems of non-uniform judgment standard, dependence on technical experience and low detection accuracy caused by a resistance detection method generally adopted by the conventional switch power supply detection method are solved.
Description
Technical Field
The invention relates to the technical field of power supply detection, in particular to a method for detecting the state of a switching power supply.
Background
The conventional universal power supply technology is a switching power supply which has the advantages of small volume, multiple functions and high power density and is widely applied to new energy electronic industries such as aerospace, 5G communication and the like. In order to ensure the safety of the power supply product before working, the prior art is a resistance detection method commonly used in the power supply industry: the resistance gear of the electronic multimeter is adopted to carry out impedance detection on pins outside a power supply product one by one, and whether the product has a short circuit phenomenon or not is judged according to the resistance value. Resistance detection method: the method is characterized in that detection is carried out one by one according to the pin characteristics of the product circuit diagram, and the index qualification is judged according to the experience and inheritance knowledge of technical workers.
However, the resistance detection method has the following problems: the resistance detection method adopts a passive detection method, only can carry out impedance detection on pins outside a product, and has detection time of at least 0.1-0.5 h and can not completely cover an internal interface in the case of complex electronic equipment; the impedance values of products are different, the resistance detection method cannot uniformly detect the standard, more technical worker experience and inheritance knowledge are relied on, the standard is not uniform, and the judgment is wrong; the resistance detection method cannot judge the missing welding, the wrong welding and the wrong installation of components in the product; the resistance detection method has high requirements on the technique, experience and concentration of workers, and is easy to miss detection, so that potential safety hazards are buried in equipment and personnel. Therefore, how to provide a comprehensive and rapid detection method for a switching power supply, which unifies the determination criteria and reduces the technical experience dependence, is a technical problem that needs to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a switching power supply state detection method, and aims to solve the technical problems that the existing switching power supply detection method usually adopts a resistance detection method, so that the judgment standard is not uniform, the technical experience is relied on, and the detection accuracy is not high.
In order to achieve the above object, the present invention provides a method for detecting a state of a switching power supply, the method comprising the steps of:
the input end of the switching power supply is connected with a direct current stabilized power supply, and the direct current stabilized power supply is used for providing weak detection current for the switching power supply;
the output end of the switching power supply is connected with a voltage detection device and a current detection device, the voltage detection device is used for detecting the output voltage of the switching power supply, and the current detection device is used for detecting the output current of the switching power supply;
detecting the working temperature of the switching power supply by using a temperature detection device;
and judging the state of the switching power supply according to the output voltage, the output current and the working temperature.
Optionally, the step of determining the state of the switching power supply according to the output voltage, the output current, and the operating temperature specifically includes:
judging whether the switching power supply has a fault or not according to the output voltage and the output current;
and judging whether the switching power supply has a fault or not according to the working temperature.
Optionally, the step of determining whether the switching power supply has a fault according to the output voltage and the output current specifically includes:
if the output voltage and the output current are within a preset range, judging that the switching power supply has no fault;
if the output voltage and the output current exceed the preset range, judging that the switching power supply has misloading, redundant objects and faults;
and if the output voltage and the output current are 0, judging that the switching power supply has neglected installation and has faults.
Optionally, the temperature detection device adopts a thermal infrared imager.
Optionally, the step of determining whether the switching power supply has a fault according to the working temperature specifically includes:
if the temperature value variation trends of all positions in the working temperature image of the switching power supply detected by the thermal infrared imager are consistent, judging that the switching power supply has no fault;
if the temperature value variation trends of all positions in the working temperature image of the switching power supply detected by the thermal infrared imager are inconsistent, judging that the switching power supply has redundancy, wrong welding or wrong welding and has faults;
and if the temperature value in the working temperature image of the switching power supply detected by the thermal infrared imager is unchanged, judging that the switching power supply has missing welding, insufficient welding and faults.
Optionally, the detected weak current is 10% of a standard index of the switching power supply.
Optionally, the standard index includes a voltage standard index, a current standard index and a power standard index.
The embodiment of the invention provides a method for detecting the state of a switching power supply, which comprises the steps that a direct-current stabilized power supply is connected to the input end of the switching power supply, and the direct-current stabilized power supply is used for providing weak detection current for the switching power supply; the output end of the switching power supply is connected with a voltage detection device and a current detection device, the voltage detection device is used for detecting the output voltage of the switching power supply, and the current detection device is used for detecting the output current of the switching power supply; detecting the working temperature of the switching power supply by using a temperature detection device; and judging the state of the switching power supply according to the output voltage, the output current and the working temperature. According to the invention, by setting the output parameters of the direct-current stabilized power supply, a weak-current power supply is provided for a detected product, a product circuit forms a loop to complete self-detection, and the working temperature is detected by the thermal infrared imager, so that the switch power supply is subjected to comprehensive, rapid and standard unified state detection, and the problems of non-unified judgment standard, dependence on technical experience and low detection accuracy caused by a resistance detection method generally adopted by the conventional switch power supply detection method are solved.
Drawings
Fig. 1 is a schematic flowchart of a method for detecting a state of a switching power supply according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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 conventional universal power supply technology is a switching power supply which has the advantages of small volume, multiple functions and high power density and is widely applied to new energy electronic industries such as aerospace, aviation, 5G communication and the like. In order to ensure the safety of the state of a power supply product before working, the prior art is a resistance detection method commonly used in the power supply industry: the resistance gear of the electronic multimeter is adopted to carry out impedance detection on external pins of a power supply product one by one, and whether the product has a short circuit phenomenon or not is judged according to the resistance value. Resistance detection method: the method is characterized in that detection is carried out one by one according to the pin characteristics of the product circuit diagram, and the index qualification is judged according to the experience and inheritance knowledge of technical workers.
However, the resistance detection method has the following problems: the resistance detection method adopts a passive detection method, only can carry out impedance detection on pins outside a product, and has detection time of at least 0.1-0.5 h and can not completely cover an internal interface in the case of complex electronic equipment; the impedance values of products are different, the resistance detection method cannot uniformly detect the standard, more technical worker experience and inheritance knowledge are relied on, the standard is not uniform, and the judgment is wrong; the resistance detection method cannot judge the missing welding, the wrong welding and the wrong installation of components in the product; the resistance detection method has high requirements on the technique, experience and concentration of workers, and is easy to miss detection, so that potential safety hazards are buried in equipment and personnel. Therefore, how to provide a comprehensive and rapid detection method for a switching power supply, which unifies the determination criteria and reduces the technical experience dependence, is a technical problem that needs to be solved urgently.
To solve this problem, various embodiments of the switching power supply state detection method of the present invention are proposed. According to the switching power supply state detection method, the output parameters of the direct-current stabilized power supply are set, a weak-current power supply is provided for a detected product, a circuit of the product forms a loop, self-checking is completed, the working temperature is detected through the thermal infrared imager, and therefore the switching power supply is subjected to comprehensive, rapid and standard state detection, and the problems that the judgment standard is not uniform, technical experience is relied on, and detection accuracy is not high due to the fact that a resistance detection method is usually adopted in the existing switching power supply detection method are solved.
An embodiment of the present invention provides a method for detecting a state of a switching power supply, and referring to fig. 1, fig. 1 is a schematic flowchart of an embodiment of the method for detecting a state of a switching power supply according to the present invention.
In this embodiment, the method for detecting the state of the switching power supply includes the following steps:
and step S100, connecting a direct current stabilized power supply to the input end of the switching power supply, and providing weak detection current for the switching power supply by using the direct current stabilized power supply.
It should be noted that the detected weak current is 10% of the standard index of the switching power supply. The standard indexes comprise a voltage standard index, a current standard index and a power standard index.
And step S200, connecting a voltage detection device and a current detection device at the output end of the switching power supply, detecting the output voltage of the switching power supply by using the voltage detection device, and detecting the output current of the switching power supply by using the current detection device.
Specifically, the voltage detection device adopts an oscilloscope, and the current detection device adopts a current oscilloscope, and respectively detects the voltage and the current at the output end of the switching power supply.
And step S300, detecting the working temperature of the switching power supply by using a temperature detection device.
Specifically, the temperature detection device adopts a thermal infrared imager.
And step S400, judging the state of the switching power supply according to the output voltage, the output current and the working temperature.
Specifically, when the state of the switching power supply is determined, whether the switching power supply has a fault may be determined based on the output voltage and the output current, or whether the switching power supply has a fault may be determined based on the operating temperature.
It is easy to understand that, when determining whether the switching power supply has a fault according to the output voltage and the output current, the method specifically includes:
(1) if the output voltage and the output current are within a preset range, judging that the switching power supply has no fault;
(2) if the output voltage and the output current exceed the preset range, judging that the switching power supply has misloading, redundancy and faults;
(3) and if the output voltage and the output current are 0, judging that the switching power supply has neglected installation and has faults.
It is easy to understand that, when determining whether the switching power supply has a fault according to the operating temperature, the method specifically includes:
(1) if the temperature value variation trends of all positions in the working temperature image of the switching power supply detected by the thermal infrared imager are consistent, judging that the switching power supply has no fault;
(2) if the temperature value variation trends of all positions in the working temperature image of the switching power supply detected by the thermal infrared imager are inconsistent, judging that the switching power supply has redundancy, wrong welding or wrong welding and has faults;
(3) and if the temperature value in the working temperature image of the switching power supply detected by the thermal infrared imager is unchanged, judging that the switching power supply has missing welding, insufficient welding and faults.
In the embodiment, a switching power supply state detection method is provided, in which a direct-current stabilized voltage supply output parameter is set to provide a weak current power supply for a detected product, a product circuit forms a loop to complete self-detection, and a thermal infrared imager is used for detecting the working temperature, so that the switching power supply is subjected to comprehensive, rapid and standard state detection, and the problems that the existing switching power supply detection method generally adopts a resistance detection method, so that the judgment standard is not uniform, technical experience is relied on, and the detection accuracy is not high are solved.
For convenience of understanding, the present embodiment provides a specific example of the detection of the state of the switching power supply, which is as follows:
in this embodiment, the detection station: the device comprises a direct-current stabilized power supply, an oscilloscope, a current oscilloscope, a probe and an infrared thermal imager, wherein a test station is set up to set instrument parameters, an instrument is started to read numerical values, and the product qualification is judged according to the standard.
The direct-current stabilized power supply can adopt an IT6153 power supply, the oscilloscope adopts a TDS3012B oscilloscope, the current oscilloscope adopts an HRO66Zi current oscilloscope, and the infrared thermal imager adopts an H21Pro thermal imager.
In the embodiment, by being familiar with the working principle of the handheld power supply product, after being electrified, voltage/current forms a loop in a circuit, and a device generates power (power is converted into temperature). The core parameter voltage/current (10% V/A of the index) is established according to the principle and the product index, and the judgment standard is less than 10% V/A of the index.
It should be noted that, in the step of detecting the state of the switching power supply in this embodiment, a parameter of the method is formulated according to the working principle and the technical specification index, and the parameter is 10% of the index; setting output parameters of a direct current stabilized power supply, providing a weak current power supply for a tested product, forming a loop for a product circuit, and completing self-checking; connecting a tested product and instrument equipment, starting an input power supply, and observing voltage/current detection values of a direct current stabilized power supply and an oscilloscope; and detecting the working temperature of the module by using a thermal infrared imager, and observing a temperature detection value.
Specifically, the weak current detection is implemented as follows:
1. the product index requires voltage/current/power as follows: 28V/3A/80W, and making weak current detection parameters, wherein the parameters are 10% of indexes: 3V/0.3A/8W.
2. And setting the output voltage/current of the direct-current stabilized power supply according to the weak current detection parameters.
3. Connecting the tested product and the instrument, turning on the input power supply, and observing the voltage/current detection values of the direct current stabilized voltage power supply and the oscilloscope.
And (4) qualification judgment:
a. detecting the value in the set parameters to indicate that the product is qualified;
b. detecting that the value exceeds a set value (voltage/current), indicating that the product has misloading and redundancy, and judging the product to be a fault;
c. and if the detected value exceeds 0, the product is neglected to be installed, so that a circuit cannot form a loop, and the fault is judged.
4. And detecting the working temperature of the product by using a thermal infrared imager, and observing a detection value (the brighter the brightness is, the higher the temperature is).
And (4) qualification judgment:
a. the detection temperature value changes of the whole product are relatively consistent, and the product is qualified;
b. the temperature of a detection value at a certain point of the product is too high, which indicates that the point has redundancy and short circuit caused by wrong welding or wrong assembly, and the fault is judged;
c. the temperature of the product detection value has no change, which indicates that the device does not work due to the leakage welding or the insufficient welding, and the circuit can not form a loop, thus judging the fault.
The switching power supply state detection method provided by the embodiment can fix the detection station, different types of products only need to replace detection cables and detection parameters, instrument setting, detection methods and qualified criteria do not need to be changed, the flexibility is high, the operation is simple and understandable, the requirement on the skill of an operator is low, and the popularity is high.
The above are only preferred embodiments of the invention, and not intended to limit the scope of the invention, and all equivalent structures or equivalent flow transformations that may be applied to the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the invention.
Claims (7)
1. A method for detecting a state of a switching power supply, the method comprising the steps of:
the input end of the switching power supply is connected with a direct current stabilized power supply, and the direct current stabilized power supply is used for providing weak detection current for the switching power supply;
the output end of the switching power supply is connected with a voltage detection device and a current detection device, the voltage detection device is used for detecting the output voltage of the switching power supply, and the current detection device is used for detecting the output current of the switching power supply;
detecting the working temperature of the switching power supply by using a temperature detection device;
and judging the state of the switching power supply according to the output voltage, the output current and the working temperature.
2. The method for detecting the state of the switching power supply according to claim 1, wherein the step of determining the state of the switching power supply according to the output voltage, the output current and the operating temperature specifically comprises:
judging whether the switching power supply has a fault or not according to the output voltage and the output current;
and judging whether the switching power supply has a fault or not according to the working temperature.
3. The method for detecting the state of the switching power supply according to claim 2, wherein the step of determining whether the switching power supply has a fault according to the output voltage and the output current specifically comprises:
if the output voltage and the output current are within a preset range, judging that the switching power supply has no fault;
if the output voltage and the output current exceed the preset range, judging that the switching power supply has misloading, redundant objects and faults;
and if the output voltage and the output current are 0, judging that the switching power supply has neglected installation and has faults.
4. The method for detecting the status of a switching power supply according to claim 2, wherein the temperature detecting means employs a thermal infrared imager.
5. The method according to claim 4, wherein the step of determining whether the switching power supply has a fault according to the operating temperature specifically includes:
if the temperature value variation trends of all positions in the working temperature image of the switching power supply detected by the thermal infrared imager are consistent, judging that the switching power supply has no fault;
if the temperature value variation trends of all positions in the working temperature image of the switching power supply detected by the thermal infrared imager are inconsistent, judging that the switching power supply has redundancy, wrong welding or wrong welding and has faults;
and if the temperature value in the working temperature image of the switching power supply detected by the thermal infrared imager is unchanged, judging that the switching power supply has missing welding, insufficient welding and faults.
6. The method according to claim 1, wherein the detected weak current is 10% of a standard index of the switching power supply.
7. The method according to claim 6, wherein the standard indicators include a voltage standard indicator, a current standard indicator, and a power standard indicator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210571672.2A CN115047370A (en) | 2022-05-24 | 2022-05-24 | Method for detecting state of switching power supply |
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| CN202210571672.2A CN115047370A (en) | 2022-05-24 | 2022-05-24 | Method for detecting state of switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116500487A (en) * | 2023-06-25 | 2023-07-28 | 深圳市力生美半导体股份有限公司 | Fault detection system and method for switching power supply, terminal equipment and medium |
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2022
- 2022-05-24 CN CN202210571672.2A patent/CN115047370A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116500487A (en) * | 2023-06-25 | 2023-07-28 | 深圳市力生美半导体股份有限公司 | Fault detection system and method for switching power supply, terminal equipment and medium |
| CN116500487B (en) * | 2023-06-25 | 2023-09-19 | 深圳市力生美半导体股份有限公司 | Fault detection system and method for switching power supply, terminal equipment and medium |
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