CN113687197A - Method for detecting impact current resistance of electrolytic capacitor in switching power supply whole machine - Google Patents
Method for detecting impact current resistance of electrolytic capacitor in switching power supply whole machine Download PDFInfo
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- CN113687197A CN113687197A CN202110967866.XA CN202110967866A CN113687197A CN 113687197 A CN113687197 A CN 113687197A CN 202110967866 A CN202110967866 A CN 202110967866A CN 113687197 A CN113687197 A CN 113687197A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000032683 aging Effects 0.000 abstract description 13
- 230000002950 deficient Effects 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 abstract description 2
- 238000012216 screening Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention relates to the technical field of current detection, in particular to a method for detecting impact current resistance of an electrolytic capacitor in a switch power supply complete machine, which solves the problem that the aging impact mode in the prior art is insufficient because the aging alternating voltage is 50 or 60Hz sine wave voltage, and the startup impact current is different along with the voltage difference at the startup time when the switch power supply is subjected to aging high voltage repeated switching impact. A method for detecting impact current resistance of an electrolytic capacitor in a switch power supply complete machine comprises the following steps: the method comprises the following steps: firstly, a bridge rectifier circuit is formed by a first diode, a second diode, a third diode and a fourth diode. The energy storage C1 capacitor of the test circuit can keep the direct current voltage at the maximum value, and when the constant high voltage is used for testing a product, the maximum impact current can be ensured to be obtained on the product every time, and the screening of defective products is facilitated.
Description
Technical Field
The invention relates to the technical field of current detection, in particular to a method for detecting impact current resistance of an electrolytic capacitor in a switch power supply complete machine.
Background
In the production of the whole switching power supply, components or defective products are usually screened out by means of whole aging, particularly, the impact resistance of electronic components is detected by applying pulsed high voltage (namely, products needing aging test are repeatedly switched under high-voltage alternating current), for electrolytic capacitors, the maximum charging current is provided when the machine is started at the highest voltage, the charging current is often tens to hundreds of amperes, the charging time is tens of microseconds, and internal burning or breakdown can occur to part of electrolytic capacitors with process defects under the large impact current, namely, the power supply products using the defective electrolytic capacitors can be screened out by means of the aging mode.
The aging impact mode in the prior art has defects because the aging alternating-current voltage is 50 or 60Hz sine-wave voltage, the startup impact current is different along with the voltage at the startup time when the switch power supply is subjected to aging high-voltage pulse impact, the startup time voltage is zero under extreme conditions, the startup current is the minimum value, and the product loses the significance of being impacted by the switch during aging.
Disclosure of Invention
The invention aims to provide a method for detecting the impact current resistance of an electrolytic capacitor in the whole switch power supply, which solves the problem that the aging impact mode in the prior art is insufficient because the aging alternating voltage is 50 or 60Hz sine wave voltage and the start-up impact current is different along with the voltage difference at the start-up time when the switch power supply is subjected to aging high-voltage pulse impact.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electric appliance element used in the method for detecting the impact current resistance of the electrolytic capacitor in the switch power supply machine comprises: the detection method comprises the following steps of:
the method comprises the following steps: firstly, a first diode, a second diode, a third diode and a fourth diode form a bridge rectifier circuit, and input alternating current is converted into direct current;
step two: the C1 capacitor is used for filtering, and the rectified 100 or 120Hz pulsating direct current is converted into constant and stable direct current after filtering;
step three: the first resistor is used for limiting surge current generated by the large-capacity C1 capacitor during startup;
step four: the second resistor is used for discharging the capacitor C1 after the test is finished, and a proper resistor is selected to enable the discharge current to be 1-5 milliamperes;
step five: and the second switch is repeatedly opened and closed for a plurality of times under the condition that the switching power supply is connected to the load.
Preferably, when the charging of the C1 capacitor is completed, the first switch of the relay is closed.
Preferably, the capacity of the C1 capacitor is selected to be more than 10 times of the capacity of an electrolytic capacitor in the switching power supply to be tested, so that the voltage at the moment of starting the switching power supply does not drop too much, and sufficient impact current is provided.
Preferably, the fuse can provide overcurrent protection, and potential safety hazards are prevented from being generated when the circuit is abnormal.
The invention has at least the following beneficial effects:
in order to ensure that the switch power supply product has an impact effect similar to the peak value of alternating current sine waves when being started every time, the energy storage C1 capacitor of the test circuit can keep the direct current voltage at the maximum value, the maximum impact current can be ensured to be obtained every time when the product is tested at the constant high voltage, and the screening of defective products is facilitated, the capacity of the C1 capacitor is selected to be more than 10 times of the capacity of an electrolytic capacitor in the switch power supply to be tested, so that the instantaneous voltage of the start-up can not drop too much, enough impact current is provided, multiple times of high-current impact of the switch power supply product is realized, and different test standard requirements are met. The method can also detect the impact current resistance of the rectifier diode or the rectifier bridge.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of the present invention.
In the figure: 1. a first switch; 2. a second switch; 3. a first diode; 4. a second diode; 5. a third diode; 6. a fourth diode; 7. a first resistor; 8. a second resistor; 9. a C1 capacitance; 10. a switching power supply to be tested; 11. and a fuse.
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.
Example one
Referring to fig. 1, the electrical components used in the method for detecting the impact current resistance of the electrolytic capacitor in the switching power supply unit comprise: the detection method comprises the following steps of:
the method comprises the following steps: firstly, a bridge rectifier circuit is formed by a first diode 3, a second diode 4, a third diode 5 and a fourth diode 6, and input alternating current is converted into direct current;
step two: the C1 capacitor 9 is used for filtering, and the rectified 100 or 120Hz pulsating direct current is converted into constant and stable direct current after filtering;
step three: the first resistor 7 is used for limiting the surge current generated by the large-capacity C1 capacitor 9 during startup;
step four: the second resistor 8 is used for discharging the capacitor 9C 1 after the test is finished, and a proper resistor is selected to enable the discharging current to be 1-5 milliamperes;
step five: and the second switch 2 is repeatedly opened and closed for a plurality of times under the condition that the switching power supply is connected to the load.
Example two
Referring to fig. 1, when the charging of the capacitor 9 of C1 is completed, the first switch 1 of the relay is closed.
The capacity of the C1 capacitor is selected to be more than 10 times of the capacity of an electrolytic capacitor in the switching power supply to be tested, so that the situation that the voltage at the moment of starting the switching power supply does not drop too much can be ensured, enough impact is provided, meanwhile, the current realizes multiple heavy current impact of the switching power supply product, and the requirements of different test standards are met
EXAMPLE III
Referring to fig. 1, the capacity of the capacitor 9 of C1 is selected to be more than 10 times of the capacity of the electrolytic capacitor inside the switching power supply 10 to be tested, so that the voltage at the moment of starting up can be prevented from dropping too much, sufficient impact current can be provided, the fuse 11 can provide overcurrent protection, and potential safety hazard can be prevented when the circuit is abnormal.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A method for detecting the impact current resistance of an electrolytic capacitor in a switching power supply machine is characterized in that an electric appliance element used by the method for detecting the impact current resistance of the electrolytic capacitor in the switching power supply machine comprises the following steps: the detection method comprises the following steps of:
the method comprises the following steps: firstly, a first diode (3), a second diode (4), a third diode (5) and a fourth diode (6) form a bridge rectifier circuit, and input alternating current is converted into direct current;
step two: the C1 capacitor (9) is used for filtering, and the rectified 100 or 120Hz pulsating direct current is converted into constant and stable direct current after filtering;
step three: the first resistor (7) is used for limiting the surge current generated by the large-capacity C1 capacitor (9) during startup;
step four: the second resistor (8) is used for discharging the C1 capacitor (9) after the test is finished, and a proper resistor is selected to enable the discharging current to be 1-5 milliamperes;
step five: and the second switch (2) repeatedly opens and closes the second switch (2) for a plurality of times under the condition that the switching power supply is connected to the load.
2. The method for detecting the impact current resistance of the electrolytic capacitor in the switching power supply complete machine according to the claim 1, characterized in that when the charging of the C1 capacitor (9) is completed, the first switch (1) of the relay is closed.
3. The method for detecting the impact current resistance of the electrolytic capacitor in the switching power supply complete machine according to claim 1, wherein the capacity of the C1 capacitor (9) is selected to be more than 10 times of the capacity of the electrolytic capacitor in the switching power supply (10) to be detected, so that the voltage does not drop too much at the starting-up moment, and sufficient impact current is provided.
4. The method for detecting the impact current resistance of the electrolytic capacitor in the switching power supply complete machine according to claim 1, wherein the fuse (11) can provide overcurrent protection to prevent potential safety hazards when a circuit is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110967866.XA CN113687197A (en) | 2021-08-23 | 2021-08-23 | Method for detecting impact current resistance of electrolytic capacitor in switching power supply whole machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110967866.XA CN113687197A (en) | 2021-08-23 | 2021-08-23 | Method for detecting impact current resistance of electrolytic capacitor in switching power supply whole machine |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285436Y (en) * | 2008-09-04 | 2009-08-05 | 深圳市东辰科技有限公司 | Circuit for testing maximum starting impact current of switch electric power source |
| JP2011109788A (en) * | 2009-11-17 | 2011-06-02 | Cosel Co Ltd | Rush current limiting circuit |
| CN203368015U (en) * | 2013-07-18 | 2013-12-25 | 江苏省黑马高科技发展有限责任公司 | A surge inhibition current protective device |
| WO2015196632A1 (en) * | 2014-06-24 | 2015-12-30 | 中兴通讯股份有限公司 | Method and circuit for suppressing surge current of direct current power source |
-
2021
- 2021-08-23 CN CN202110967866.XA patent/CN113687197A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285436Y (en) * | 2008-09-04 | 2009-08-05 | 深圳市东辰科技有限公司 | Circuit for testing maximum starting impact current of switch electric power source |
| JP2011109788A (en) * | 2009-11-17 | 2011-06-02 | Cosel Co Ltd | Rush current limiting circuit |
| CN203368015U (en) * | 2013-07-18 | 2013-12-25 | 江苏省黑马高科技发展有限责任公司 | A surge inhibition current protective device |
| WO2015196632A1 (en) * | 2014-06-24 | 2015-12-30 | 中兴通讯股份有限公司 | Method and circuit for suppressing surge current of direct current power source |
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