CN109655693B - Device and method for electromagnetic compatibility power frequency doubling magnetic field test - Google Patents
Device and method for electromagnetic compatibility power frequency doubling magnetic field test Download PDFInfo
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- CN109655693B CN109655693B CN201811638222.0A CN201811638222A CN109655693B CN 109655693 B CN109655693 B CN 109655693B CN 201811638222 A CN201811638222 A CN 201811638222A CN 109655693 B CN109655693 B CN 109655693B
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- 238000012360 testing method Methods 0.000 title claims abstract description 162
- 238000000034 method Methods 0.000 title description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 238000010998 test method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000036039 immunity Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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Abstract
The invention discloses a device and a test method for an electromagnetic compatible power frequency doubling magnetic field test, comprising a packaging shell and an internal structure, wherein the packaging shell is provided with a device power port, a magnetic field current input port, a magnetic field coil output port and an external ammeter port, the internal structure comprises a control module, an electromagnetic control module for controlling the injection and closing of current in the magnetic field coil, and a test time control module for regulating test time and displaying test residual time, the frequency measurement display module is used for measuring and displaying current frequency in the power frequency magnetic field coil in real time, and the electromagnetic control module and the test time control module are connected with the control module. The device is suitable for power frequency double frequency magnetic field tests with different test frequencies, the test frequencies can be monitored and displayed in real time, and the test current and the test time can be accurately controlled.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility testing, in particular to a device and a method for electromagnetic compatibility power frequency doubling magnetic field test.
Background
With the development of science and technology, electronic technology gradually develops to aspects of high frequency, high speed, high precision, high reliability, high sensitivity, high integration and the like, and the problem of electromagnetic compatibility of electric and electronic equipment is increasingly prominent, and is highly valued by governments of various countries, and more electromagnetic compatibility instructions, specifications and standards are gradually brought out and forced execution is required. Electromagnetic compatibility refers to the ability of a device or system to function properly in its electromagnetic environment without creating an intolerable electromagnetic nuisance to anything in the environment. Thus, electromagnetic compatibility includes two requirements: on one hand, electromagnetic interference generated by equipment on the environment in the normal operation process cannot exceed a certain limit value; on the other hand, the device has a certain degree of immunity, namely electromagnetic sensitivity, to electromagnetic interference existing in the environment.
The industrial frequency magnetic field test is a common test item in electromagnetic compatibility tests. The mains frequency magnetic field is generated by mains frequency current in the conductor, or very little by other devices in the vicinity, such as leakage flux of a transformer. The magnetic field is accompanied at the place where the current flows, and two modes exist due to the generation of the magnetic field in actual operation: one is a steady, relatively small field strength generated by normal operating current, and the other is a short duration but large field strength generated by abnormal operating current. The industrial frequency magnetic field test is to test the immunity to magnetic field disturbance when the equipment is in an industrial frequency magnetic field related to the specific position and installation condition (such as the equipment is close to a disturbance source).
In the industrial frequency magnetic field test, the magnetic field intensity, the test frequency and the test duration of the test are set according to specific product standards or regulations in the product standards, if the product standards have no special requirements, the test frequency is related to the power supply mode of tested equipment, and generally for equipment powered by a network power supply, the test frequency is carried out according to the claimed power supply frequency in a product nameplate, and for products powered by an internal power supply, the test is carried out at both 50Hz and 60 Hz. At present, the equipment of each laboratory can basically meet the requirements of the test frequency. However, certain product standards set special requirements for the power frequency magnetic field test, for example, standard YY 0885 prescribes that the power frequency magnetic field test frequency of a dynamic electrocardiograph is 3 times of the power frequency, i.e. the test should be performed at two frequencies of 150Hz and 180Hz, and the existing test equipment in each laboratory cannot meet the requirements. The current of the injection coil is regulated by connecting a variable frequency power supply with a pulley resistor in an individual laboratory to carry out a test, the current frequency during the test cannot be monitored in real time, the test duration and the current intensity in the injection coil cannot be accurately controlled, and the operation has a certain danger.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art, and provides a device for an electromagnetic compatibility power frequency double frequency magnetic field test, which is applicable to power frequency magnetic field devices with different test frequencies, the highest test frequency can reach 400Hz, the test frequency can be monitored and displayed in real time, the test current and the test time can be accurately controlled, the device is safe to use and convenient to operate, a user can perform the power frequency magnetic field test at any frequency according to the test requirement of a product, the flexibility is high, and the requirement of special test frequency of some products can be met.
The invention further aims to provide a test method for the electromagnetic compatibility power frequency doubling magnetic field test.
The technical scheme adopted by the invention is as follows:
the utility model provides a device for electromagnetic compatibility frequency doubling magnetic field test, includes encapsulation shell and inner structure, be equipped with device power port, magnetic field current input port, magnetic field coil output port, external ampere meter port on the encapsulation shell, inner structure includes control module, control the injection of electric current in the magnetic field coil and the electromagnetic control module of closing, regulation and control test time and the test time control module of showing test remaining time for the frequency measurement display module of current frequency in the real-time measurement and the display power frequency magnetic field coil, electromagnetic control module, test time control module all are connected with control module.
The device for the electromagnetic compatible power frequency doubling magnetic field test adopts the packaging shell to package an internal structure, is safe to use and attractive in appearance, in the internal structure, the test time control module is connected with the control module, can select required test time and display test residual time, the control module also calculates time and controls the electromagnetic control module, the electromagnetic control module controls the injection and closing of current in the magnetic field coil, and the frequency measurement display module is used for monitoring and displaying test frequency adopted by the power frequency doubling magnetic field test.
In the actual use process, the device power port is externally connected with a variable frequency power supply, the magnetic field current input port is connected with the external variable frequency power supply through an external voltage regulator, a magnetic field coil required by the power frequency doubling magnetic field test is connected to the device for the electromagnetic compatibility power frequency doubling magnetic field test through a magnetic field coil output port, and the external ammeter port is externally connected with an ammeter. When electromagnetic compatibility test is carried out, an operator selects the duration of the power frequency doubling magnetic field test through the test time control module, the test residual time is displayed, the frequency measurement display module monitors and displays the current frequency in the power frequency doubling magnetic field coil in real time, and the external ammeter displays the current intensity injected into the power frequency doubling magnetic field coil. The power frequency double magnetic field test with different test frequencies can be realized, the test frequencies can be monitored and displayed in real time, the test current and the test time can be accurately controlled, and the device has the advantages of safe use, convenient operation, one-key start or interrupt test and the like.
Preferably, the frequency measurement display module is connected with a device power port.
Preferably, the device further comprises a current limiting protection resistor and a switch for controlling the power frequency doubling magnetic field testing device for electromagnetic compatibility, and the packaging shell is provided with an opening of the switch. The current limiting protection resistor is used for dividing the voltage of the magnetic field coil to prevent the current in the coil from being overlarge, and the switch is used for controlling the working of the power frequency doubling magnetic field test device for electromagnetic compatibility to be started and closed. Further, the control module, the electromagnetic control module and the current limiting protection resistor are sequentially connected. The current limiting protection resistor is also connected with the magnetic field current input port. The switch is connected with the control module.
Preferably, the device further comprises a power supply module for converting the voltage of the power supply port of the device. The power module may convert an ac input voltage at a power port of the device to a lower dc voltage output, such as a 220V voltage to a 5V voltage output. In particular, the power supply module may be an AC/DC switching power supply.
Preferably, the electromagnetic control module is a magnetic field loop on-off relay, and the magnetic field loop on-off relay is used for controlling the injection and closing of current in the magnetic field coil. Further, the magnetic field loop on-off relay is connected with the magnetic field coil output port.
Preferably, the test time control module comprises a time selection knob and an LED display screen, wherein the time selection knob is provided with a plurality of gears corresponding to different time selections, and an opening for installing the time selection knob and the LED display screen is formed in the packaging shell. The time selection knob is provided with different gears, and the time selection knob corresponds to different test duration respectively, and the control of the power frequency doubling magnetic field test duration is realized through the control module. And the LED display screen displays the residual time of the power frequency doubling magnetic field test in real time.
Preferably, the frequency measurement display module is a frequency meter, and an opening for installing a display screen of the frequency meter is formed in the packaging shell. The frequency meter monitors and displays the frequency of the power frequency doubling magnetic field test current in real time.
Preferably, the device for electromagnetic compatibility frequency doubling magnetic field test further comprises a driving circuit for driving the display module to display the residual time of the test. Specifically, the driving circuit is a circuit board and drives the LED display screen to display.
Preferably, the device power port is externally connected with a variable frequency power supply. The power supply voltage of the variable frequency power supply is 100-240V, and the power supply frequency is the test frequency adopted by the power frequency doubling magnetic field test.
Preferably, the magnetic field current input port is connected with a variable frequency power supply through a transformer. The maximum power supply voltage of the magnetic field current input port is not more than 50V, and the specific voltage value is regulated through an external voltage regulator, so that the current injected into the coil reaches the current intensity required by the corresponding test grade. The power supply voltage of the magnetic field current input port is regulated by the transformer, and can be between 15 and 50V, and the power supply frequency is the test frequency adopted by the power frequency doubling magnetic field test.
Preferably, the external ammeter port is connected with an external AC ammeter. The external ammeter port is connected with an external ammeter and used for displaying the value of the current injected into the coil.
Preferably, the magnetic field coil output port is connected with an external magnetic field coil. The port of the external magnetic field coil is matched with the coil port of the power frequency doubling magnetic field test equipment, and the magnetic field coil output port is used for connecting the coil of the power frequency doubling magnetic field test.
Preferably, the resistance of the current-limiting protection resistor is 5 omega, and the power is 200W.
The control module is a control circuit board.
The test method for the electromagnetic compatibility power frequency double frequency magnetic field test comprises the following steps:
s1, connecting a power port of the device with a variable frequency power supply, connecting a magnetic field current input port with the variable frequency power supply through a transformer, connecting a magnetic field coil output port with a magnetic field coil, and connecting an external ammeter port with an external AC ammeter;
s2, setting the output frequency of the variable frequency power supply as the test frequency adopted by the power frequency doubling magnetic field test, and adjusting the input voltage of a magnetic field current input port through a transformer to enable the current value measured by an external AC ammeter to reach the current intensity required by the test;
s3, adjusting the time selection knob to a required gear, pressing a switch to start a power frequency doubling magnetic field test, displaying test residual time on an LED display screen in real time, displaying the frequency of test current on a display screen of a frequency meter, and closing current injection in a magnetic field coil by an electromagnetic control module when the test residual time is 0.
Compared with the prior art, the invention has the beneficial effects that: the device for electromagnetic compatibility power frequency doubling magnetic field test can facilitate a user to realize power frequency doubling magnetic field test at any different frequencies, and meets the power frequency doubling magnetic field test requirements of different products; the device for the electromagnetic compatibility power frequency double frequency magnetic field test can accurately control the test duration and the test current, and strictly meets the standard requirements; the device for the electromagnetic compatibility power frequency double frequency magnetic field test is safe to use, convenient to operate, capable of starting or interrupting the test by one key, stable in performance and long in service life.
Drawings
Fig. 1 is a block diagram of an external port structure of an apparatus for electromagnetic compatibility frequency doubling magnetic field test according to an embodiment.
Fig. 2 is a schematic block diagram of an internal circuit of the device for electromagnetic compatibility frequency doubling magnetic field test according to the embodiment.
Description of the drawings: 1. a device power port; 2. a magnetic field current input port; 3. a magnetic field coil output port; 4. externally connecting an ammeter port; 5. a package housing; 6. a power module; 8. a control module; 9. a magnetic field loop on-off relay; 10. a time selection knob; 11. an LED display screen; 12. a frequency meter; 13. a current limiting protection resistor; 14. a switch; 15. a driving circuit; 16. a magnetic field coil; 17. AC ammeter.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1, the embodiment discloses a device for an electromagnetic compatible frequency-doubling magnetic field test, which comprises a packaging shell 5 and an internal structure, wherein a device power port 1, a magnetic field current input port 2, a magnetic field coil output port 3 and an external ammeter port 4 are arranged on the packaging shell 5, as shown in fig. 2, the internal structure comprises a power module 6 for converting the voltage of the device power port 1, a control module 8, a magnetic field loop on-off relay 9 for controlling the injection and closing of current in the magnetic field coil, a time selection knob 10 for regulating the duration of the frequency-doubling magnetic field test, an LED display screen 11 for displaying the residual time of the frequency-doubling magnetic field test, a frequency meter 12 for measuring and displaying the current frequency in the frequency-doubling magnetic field coil in real time, a current limiting protection resistor 13 and a switch 14 for controlling the device for the electromagnetic compatible frequency-doubling magnetic field test, the power module 6, the control module 8, the magnetic field loop on-off relay 9 and the current limiting protection resistor 13 are sequentially connected, the time selection module 6, the LED display screen 11 and the switch 14 are all connected with the control module 8, the power module 6 and the frequency meter 12 are connected with the device power port 1, the current protection switch 9 is connected with the magnetic field loop output port 3, and the magnetic field loop protection knob is connected with the magnetic field input port 3.
The device for electromagnetic compatibility power frequency doubling magnetic field test of the embodiment adopts the packaging shell to package the internal structure, so that the device is safe to use and attractive in appearance, and the power module 6 in the internal structure can convert the input voltage of the power port 1 of the device into lower voltage for output; the time selection knob 10, the LED display screen 11 and the switch 14 are all connected with the control module 8, the time selection knob 10, the LED display screen 11 and the switch 14 can realize corresponding control of the device for electromagnetic compatibility power frequency doubling magnetic field test through the control module 8, the control module 8 also calculates time and controls the magnetic field loop on-off relay 9, the magnetic field loop on-off relay 9 controls injection and closing of current in the magnetic field coil, the frequency meter 12 is used for monitoring and displaying test frequency adopted by the power frequency doubling magnetic field test, the current limiting protection resistor 13 is used for dividing voltage of the magnetic field coil 16, and current in the coil is prevented from being overlarge.
In the actual use process, the device power port 1 is externally connected with a variable frequency power supply, the magnetic field current input port 2 is connected with the external variable frequency power supply through an external voltage regulator, a magnetic field coil required by a power frequency magnetic field test is connected to the device for an electromagnetic compatibility power frequency doubling magnetic field test through the magnetic field coil output port 3, and the external ammeter port 4 is externally connected with an ammeter. When the electromagnetic compatibility test is carried out, an operator controls the switch 14 of the device for the electromagnetic compatibility frequency doubling magnetic field test, because the power supply module 6 is connected with the device power supply port 1, the input voltage can be converted into lower voltage output, the operator selects the frequency doubling magnetic field test duration through the time selection knob 10, the time selection knob 10 is provided with different gears, the different test durations respectively correspond to the different test durations, the control of the frequency doubling magnetic field test duration is realized through the control module 8, the LED display screen 11 displays the test residual time, the frequency meter 12 monitors and displays the current frequency in the frequency doubling magnetic field coil in real time, the AC ammeter 17 displays the current intensity injected into the frequency doubling magnetic field coil, the frequency doubling magnetic field test of different test frequencies can be realized, the test frequency can be monitored and displayed in real time, the test current and the test time can be accurately controlled, and the device has the advantages of safe use, convenient operation, one-key start or interrupt test and the like.
Further, in this embodiment, the power module is an AC/DC switching power supply.
Further, the device for electromagnetic compatibility power frequency double frequency magnetic field test further comprises a driving circuit 15 for driving the display of the test residual time display module. Specifically, the driving circuit 15 is a driving circuit board, and drives the LED display screen to display.
Further, in an embodiment, the device power port 1 is externally connected with a variable frequency power supply. The power supply voltage of the variable frequency power supply is 100-240V, and the power supply frequency is the test frequency adopted by the power frequency doubling magnetic field test.
Further, in this embodiment, the magnetic field current input port 2 is connected to a variable frequency power supply through a transformer. The maximum power supply voltage of the magnetic field current input port 2 is not more than 50V, and the specific voltage value is regulated through an external voltage regulator, so that the current injected into the coil reaches the current intensity required by the corresponding test grade. In this embodiment, the power supply voltage of the magnetic field current input port 2 is regulated by a transformer, and the power supply frequency can be between 15V and 50V, which is the test frequency adopted in the frequency-doubling magnetic field test.
Further, in this embodiment, the external ammeter port 4 is connected to an external AC ammeter 17. The external ammeter port 4 is connected with an external ammeter for displaying the value of the current injected into the coil.
Further, in this embodiment, the magnetic field coil output port 3 is connected to an external magnetic field coil 16. The port 3 of the external magnetic field coil is matched with the coil port of the power frequency doubling magnetic field test device, and the magnetic field coil output port 3 is used for connecting the coil of the power frequency doubling magnetic field test.
Further, in this embodiment, the resistance of the current limiting protection resistor is 5Ω and the power is 200W.
Further, in this embodiment, the control module is a control circuit board.
The test method for the electromagnetic compatibility power frequency double frequency magnetic field test comprises the following steps:
s1, connecting a power port 1 of the device with a variable frequency power supply, connecting a magnetic field current input port 2 with the variable frequency power supply through a transformer, connecting a magnetic field coil output port 3 with a magnetic field coil 16, and connecting an external ammeter port 4 with an external AC ammeter 17;
s2, setting the output frequency of the variable frequency power supply as the test frequency adopted by the power frequency doubling magnetic field test, and adjusting the input voltage of the magnetic field current input port 2 through a transformer to enable the current value measured by the external AC ammeter 17 to reach the current intensity required by the test;
s3, adjusting the time selection knob 10 to a required gear, pressing the switch 14 to start a power frequency doubling magnetic field test, displaying the test residual time in real time by the LED display screen 11, displaying the frequency of the test current by the display screen of the frequency meter 12, and closing the injection of the current in the magnetic field coil by the electromagnetic control module when the test residual time is 0.
It should be understood that the foregoing examples of the present invention are merely illustrative of the present invention and are not intended to limit the present invention to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. The device for the electromagnetic compatibility power frequency doubling magnetic field test is characterized by comprising a packaging shell (5) and an internal structure, wherein the packaging shell (5) is provided with a device power port (1), a magnetic field current input port (2), a magnetic field coil output port (3) and an external ammeter port (4), the internal structure comprises a control module (8), an electromagnetic control module for controlling the injection and closing of current in the magnetic field coil, a test time control module for regulating test time and displaying test residual time, and a frequency measurement display module for measuring and displaying current frequency in the power frequency magnetic field coil (16) in real time, and the electromagnetic control module and the test time control module are connected with the control module (8);
the device also comprises a current limiting protection resistor (13) and a switch (14) for controlling the electromagnetic compatibility power frequency doubling magnetic field test device, wherein an opening for installing the switch (14) is formed in the packaging shell (5);
the device further comprises a power supply module (6) for converting the voltage of the device power supply port (1);
the electromagnetic control module is a magnetic field loop on-off relay (9);
the test time control module comprises a time selection knob (10) and an LED display screen (11), wherein the time selection knob (10) is provided with a plurality of gears corresponding to different time selections, and the packaging shell (5) is provided with openings for installing the time selection knob (10) and the LED display screen (11).
2. The device for electromagnetic compatibility frequency doubling magnetic field test according to claim 1, wherein the frequency measurement display module is a frequency meter (12), and an opening for installing a display screen of the frequency meter (12) is formed in the packaging shell (5).
3. The apparatus for electromagnetic compatibility frequency-doubling magnetic field testing according to claim 1, wherein the apparatus for electromagnetic compatibility frequency-doubling magnetic field testing further comprises a driving circuit (15) for driving the display of the test remaining time display module.
4. The device for electromagnetic compatibility frequency doubling magnetic field test according to claim 1, wherein a power port (1) of the device is externally connected with a variable frequency power supply; the magnetic field current input port (2) is connected with a variable frequency power supply through a transformer.
5. The device for electromagnetic compatibility frequency doubling magnetic field test according to claim 1, wherein the external ammeter port (4) is connected with an external AC ammeter (17).
6. A test method for the device for electromagnetic compatibility frequency doubling magnetic field test according to any one of claims 1 to 5, characterized by comprising the steps of:
s1, connecting a power port (1) of the device with a variable frequency power supply, connecting a magnetic field current input port (2) with the variable frequency power supply through a transformer, connecting a magnetic field coil output port (3) with a magnetic field coil, and connecting an external ammeter port (4) with an external AC ammeter (17);
s2, setting the output frequency of the variable frequency power supply as the test frequency adopted by the power frequency doubling magnetic field test, and adjusting the input voltage of the magnetic field current input port (2) through a transformer to enable the current value measured by an external AC ammeter (17) to reach the current intensity required by the test;
s3, adjusting the time selection knob (10) to a required gear, pressing a switch (14) to start a power frequency doubling magnetic field test, displaying test residual time in real time by an LED display screen (11), displaying the frequency of test current by a display screen of a frequency meter (12), and closing injection of current in a magnetic field coil by an electromagnetic control module when the test residual time is 0.
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| CN201811638222.0A CN109655693B (en) | 2018-12-29 | 2018-12-29 | Device and method for electromagnetic compatibility power frequency doubling magnetic field test |
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| CN201811638222.0A CN109655693B (en) | 2018-12-29 | 2018-12-29 | Device and method for electromagnetic compatibility power frequency doubling magnetic field test |
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| CN109655693B true CN109655693B (en) | 2023-12-12 |
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| CN209486209U (en) * | 2018-12-29 | 2019-10-11 | 广东省医疗器械质量监督检验所 | A kind of device for the test of electromagnetic compatibility power frequency frequency multiplication magnetic field |
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2018
- 2018-12-29 CN CN201811638222.0A patent/CN109655693B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344556A (en) * | 2008-09-03 | 2009-01-14 | 北京航空航天大学 | Method for enlarging effective dynamic range in electromagnetic compatibility test |
| CN101377534A (en) * | 2008-09-24 | 2009-03-04 | 北京航空航天大学 | Method for setting signal source amplitude initial value in electromagnetic compatible sensitivity test |
| CN204694836U (en) * | 2015-06-18 | 2015-10-07 | 江西服装学院 | A kind of electric energy meter power frequency magnetic field influence amount test unit |
| CN106597356A (en) * | 2016-12-03 | 2017-04-26 | 国网江西省电力公司电力科学研究院 | Single-phase electric energy meter power frequency magnetic field influence quantity testing apparatus |
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