CN108872880A - A kind of switch power supply EMI test device and method - Google Patents
A kind of switch power supply EMI test device and method Download PDFInfo
- Publication number
- CN108872880A CN108872880A CN201810528493.4A CN201810528493A CN108872880A CN 108872880 A CN108872880 A CN 108872880A CN 201810528493 A CN201810528493 A CN 201810528493A CN 108872880 A CN108872880 A CN 108872880A
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- CN
- China
- Prior art keywords
- power supply
- secondary windings
- slide rheostat
- receiver
- high frequency
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
Abstract
The invention discloses a kind of switch power supply EMI test device and methods.The device includes high frequency transformer, receiver, artificial mains network, electric energy power instrument and slide rheostat, high frequency transformer includes armature winding and several secondary windings, receiver, artificial mains network, armature winding and secondary windings are sequentially connected, and secondary windings connects slide rheostat through electric energy power instrument.The present invention connects slide rheostat instead of circuit using secondary windings, and slide rheostat is purely resistive device, will not generate high fdrequency component, while not interfering with to high fdrequency component or inhibiting effect；Improve the stability and consistency of test switch power supply EMI performance；The influence that Switching Power Supply test medium/high frequency transformer secondary loop electronic circuit tests EMI is efficiently solved, to individually evaluate the EMI performance of Switching Power Supply circuit itself；The external emission measure of complete machine air-conditioning is reduced, overall performance is preferably improved, saves rectification time and development cost.
Description
Technical field
The present invention relates to a kind of disturbed test device and method, in particular to a kind of switch power supply EMI test device and side
Method.
Background technique
With the discovery of electronic technology, more and more control panel circuits can all use Switching Power Supply to carry out power supply conversion.
The development of chip technology, switching frequency is higher and higher, will generate many High-frequency Interferences.Current test method is all to investigate sky
Adjustment machine externally interferes EMI.In general, Switching Power Supply is all an overall work, and having in operation will unavoidably make
With secondary around rear stage circuit, switch power supply secondary exists around can all connect diode, regulator block, capacitor, resistance, capacitor, resistance
Work can have certain inhibiting effect to high-frequency signal, while diode, regulator block are also possible to generate certain high fdrequency component.In this way
In the case of test switching power circuit EMI will introduce many uncertain factors, influence switching power circuit evaluation result.?
It is evaluated and is tested without individually carrying out Switching Power Supply main circuit in existing testing scheme.By repeatedly observing discovery complete machine
From switching power circuit when EMI interference is greatly interfered, need that switching power circuit is evaluated and surveyed in a hurry
Examination reduces the interference that circuit generates at source.
Summary of the invention
For the above-mentioned problems in the prior art, the present invention provides a kind of switch power supply EMI test device and method,
The influence that effective solution Switching Power Supply test medium/high frequency transformer secondary loop electronic circuit tests EMI, thus individually
Evaluate the EMI performance of Switching Power Supply circuit itself.The external emission measure of complete machine air-conditioning is reduced, overall performance is preferably improved, is saved
Rectify and improve time and development cost.
Technical scheme is as follows：
The present invention provides a kind of switch power supply EMI test device, including high frequency transformer, receiver, artificial mains network
Lisn, electric energy power instrument and slide rheostat, the high frequency transformer are measured device, the high frequency transformer include it is primary around
Group and several secondary windings, the receiver, artificial mains network Lisn, armature winding and secondary windings are sequentially connected, described
Secondary windings connects slide rheostat through electric energy power instrument.
Further, the receiver is for testing high-frequency interferencing signal.
Further, the artificial mains network makes receiver only receive high frequency transformer for external interference signals to be isolated
High-frequency signal, test High-frequency Interference, artificial mains network be used for simultaneously to high frequency transformer power supply.
Further, the electric energy power instrument is used for the electric current and voltage tested in corresponding circuit, to debug sliding variable resistance
Device resistance value.
Further, the slide rheostat is used for fictitious load.
The present invention also provides a kind of switch power supply EMI test methods, by the secondary windings of Switching Power Supply and rear stage circuit
It decomposes, by using the actual power and electric current of the operation of slide rheostat analog switched power supply main circuit, independent assessment switch electricity
The high frequency performance of source main circuit.
Further, the switch power supply EMI test method includes the following steps：
Step 1：The selected high frequency transformer to be tested, find armature winding, auxiliary winding, secondary windings 1, it is secondary around
Group 2, secondary windings 3 ... secondary windings n；Switching Power Supply is connected into receiver and artificial mains network Lisn；Secondary windings connection
Electric energy power instrument and slide rheostat；
Step 2：Switching Power Supply is opened after energization, slide rheostat resistance value is adjusted, so that electric energy power instrument electric current and voltage
Reach the rated value of design；
Step 3：Electric energy power instrument is extractd from circuit after power failure, secondary windings and slide rheostat are connected directly；
Step 4：Power on and starts to test, interference signal voltage value in receiver read switch electric power loop；
Step 5：When it needs to be determined that whether the High-frequency Interference of a certain way switch secondary circuit generation is excessive, primary electron is used
Circuit, secondary windings do not connect slide rheostat；Utilize the interference signal voltage value generated in receiver reading loop；
Step 6：Using the test spectral contrast of step 4 and step 5, perpendicular evaluation corresponds to whether circuit generates High-frequency Interference
Signal.
Beneficial effects of the present invention are as follows：
The present invention connects slide rheostat instead of circuit using secondary windings, and slide rheostat is purely resistive device, will not produce
Raw high fdrequency component, while high fdrequency component is not interfered with or inhibiting effect.Improve the stabilization of test switch power supply EMI performance
Property and consistency.The present invention efficiently solves Switching Power Supply test medium/high frequency transformer secondary loop electronic circuit and tests EMI
Influence, thus individually evaluate Switching Power Supply circuit itself EMI performance.The external emission measure of complete machine air-conditioning is reduced, is preferably changed
Kind overall performance, saves rectification time and development cost.
Detailed description of the invention
Fig. 1 is the circuit diagram of switch power supply EMI test device of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The circuit theory of switch power supply EMI test device of the present invention is as shown in Figure 1, include high frequency transformer, receiver, people
Work electric power network Lisn, electric energy power instrument and slide rheostat, the high frequency transformer are measured device, the high frequency transformer
Including armature winding and several secondary windings, the receiver, artificial mains network Lisn, armature winding and secondary windings are successively
Connection, the secondary windings connect slide rheostat through electric energy power instrument.Wherein：
Receiver：For testing the test equipment of high-frequency interferencing signal.
Artificial mains network：Signal isolation effect, is isolated external interference signals, and receiver only receives high frequency transformer test
High-frequency Interference；High frequency transformer power supply.
High frequency transformer：Measured device, switch chip circuit are the primary circuits of interference.
Electric energy power instrument：Electric current and voltage in corresponding circuit are tested, designs volume when reporting the electric current and voltage of loop works
It is fixed.Slide rheostat resistance value is debugged, is placed in electrical circuit when determining loop current and voltage, by electric energy power instrument in actual test
By from electrical circuit.
Slide rheostat：Fictitious load, slide rheostat is without switching device.Purely resistive load, high-frequency electrical parameter consistency
It is good.
Switch power supply EMI test method of the present invention includes the following steps：
The first step：The selected high frequency transformer to be tested finds armature winding, auxiliary winding (switch chip), secondary
Winding 1, secondary windings 2, secondary windings 3 ... secondary windings n.Switching Power Supply is connected into receiver and artificial mains network Lisn.
Secondary windings connects electric energy power instrument and slide rheostat.
Second step：Switching Power Supply is opened after energization, slide rheostat resistance value is adjusted, so that electric energy power instrument electric current and voltage
Reach the rated value designed in specifications.
Third step：Electric energy power instrument is extractd from circuit after power failure, secondary windings and slide rheostat are connected directly.
Because electric energy power instrument itself is electronic device, some high-frequency electromagnetic interference signals, a certain amount of interference letter can be generated under working condition
Number test data can be caused higher by circuit conduct to receiver, it is as a result inaccurate.
4th step：Power on and starts to test, interference signal voltage value in receiver read switch electric power loop.
5th step：In order to which the High-frequency Interference for determining whether a certain way switch secondary circuit generates is excessive, original can be used
Electronic loop, secondary windings do not connect slide rheostat.Utilize the interference signal voltage value generated in receiver reading loop.
6th step：Using the test spectral contrast of step 4 and step 5, it can correspond to whether circuit produces with perpendicular evaluation
Raw certain frequency interference signals.
The present invention decomposes Switching Power Supply from circuit operation principle and interference predominating path, and it is high that sub-module carries out evaluation circuit
Frequency performance.Simultaneously use the devices slippery rheostat without High-frequency Interference, analog switched power supply main circuit operation actual power and
Electric current.The high frequency performance of independent assessment Switching Power Supply main circuit, can visual test to switch main circuit high-frequency emission interference signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention.It is all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of switch power supply EMI test device, it is characterised in that：Including high frequency transformer, receiver, artificial mains network
Lisn, electric energy power instrument and slide rheostat, the high frequency transformer are measured device, the high frequency transformer include it is primary around
Group and several secondary windings, the receiver, artificial mains network Lisn, armature winding and secondary windings are sequentially connected, described
Secondary windings connects slide rheostat through electric energy power instrument.
2. a kind of switch power supply EMI test device according to claim 1, it is characterised in that：The receiver is for surveying
Try high-frequency interferencing signal.
3. a kind of switch power supply EMI test device according to claim 1, it is characterised in that：The artificial mains network
For external interference signals to be isolated, so that receiver is only received the high-frequency signal of high frequency transformer, test High-frequency Interference, artificial power supply
Network is used to power to high frequency transformer simultaneously.
4. a kind of switch power supply EMI test device according to claim 1, it is characterised in that：The electric energy power instrument is used
In the electric current and voltage tested in corresponding circuit, to debug slide rheostat resistance value.
5. a kind of switch power supply EMI test device according to claim 1, it is characterised in that：The slide rheostat is used
In fictitious load.
6. a kind of switch power supply EMI test method, it is characterised in that：By the secondary windings of Switching Power Supply and rear stage circuit point
Solution, by using the actual power and electric current of the operation of slide rheostat analog switched power supply main circuit, independent assessment Switching Power Supply
The high frequency performance of main circuit.
7. a kind of switch power supply EMI test method according to claim 6, it is characterised in that：Include the following steps：
Step 1：The selected high frequency transformer to be tested, find armature winding, auxiliary winding, secondary windings 1, secondary windings 2,
Secondary windings 3 ... secondary windings n；Switching Power Supply is connected into receiver and artificial mains network Lisn；Secondary windings connects electric energy
Power instrument and slide rheostat；
Step 2：Switching Power Supply is opened after energization, slide rheostat resistance value is adjusted, so that electric energy power instrument electric current and voltage reach
The rated value of design；
Step 3：Electric energy power instrument is extractd from circuit after power failure, secondary windings and slide rheostat are connected directly；
Step 4：Power on and starts to test, interference signal voltage value in receiver read switch electric power loop；
Step 5：When it needs to be determined that whether the High-frequency Interference of a certain way switch secondary circuit generation is excessive, primary electron is used to return
Road, secondary windings do not connect slide rheostat；Utilize the interference signal voltage value generated in receiver reading loop；
Step 6：Using the test spectral contrast of step 4 and step 5, perpendicular evaluation corresponds to whether circuit generates High-frequency Interference letter
Number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810528493.4A CN108872880B (en) | 2018-05-29 | 2018-05-29 | A kind of switch power supply EMI test device and method |
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| CN201810528493.4A CN108872880B (en) | 2018-05-29 | 2018-05-29 | A kind of switch power supply EMI test device and method |
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| Publication Number | Publication Date |
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| CN108872880A true CN108872880A (en) | 2018-11-23 |
| CN108872880B CN108872880B (en) | 2019-11-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683107A (en) * | 2018-12-19 | 2019-04-26 | 四川长虹电子部品有限公司 | The EMI index adjusting, measuring method of Switching Power Supply |
| CN111398845A (en) * | 2020-03-13 | 2020-07-10 | 苏州浪潮智能科技有限公司 | GPU type server power supply testing method and device |
| CN113281601A (en) * | 2021-06-18 | 2021-08-20 | 四川长虹空调有限公司 | Air conditioner EMI test method |
| CN113341361A (en) * | 2021-06-04 | 2021-09-03 | 江苏海明医疗器械有限公司 | Electronic equipment rectification device, system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279311A (en) * | 2011-06-30 | 2011-12-14 | 重庆市电力公司江津供电局 | Method for online detection and total loss determination of neutral current of distribution transformer |
| CN205506960U (en) * | 2016-03-17 | 2016-08-24 | 保定市暄威电力设备科技有限公司 | Multichannel carries out frequency response tester of power transformer frequency response method test simultaneously |
-
2018
- 2018-05-29 CN CN201810528493.4A patent/CN108872880B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279311A (en) * | 2011-06-30 | 2011-12-14 | 重庆市电力公司江津供电局 | Method for online detection and total loss determination of neutral current of distribution transformer |
| CN205506960U (en) * | 2016-03-17 | 2016-08-24 | 保定市暄威电力设备科技有限公司 | Multichannel carries out frequency response tester of power transformer frequency response method test simultaneously |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683107A (en) * | 2018-12-19 | 2019-04-26 | 四川长虹电子部品有限公司 | The EMI index adjusting, measuring method of Switching Power Supply |
| CN111398845A (en) * | 2020-03-13 | 2020-07-10 | 苏州浪潮智能科技有限公司 | GPU type server power supply testing method and device |
| CN111398845B (en) * | 2020-03-13 | 2022-12-27 | 苏州浪潮智能科技有限公司 | GPU type server power supply testing method and device |
| CN113341361A (en) * | 2021-06-04 | 2021-09-03 | 江苏海明医疗器械有限公司 | Electronic equipment rectification device, system and method |
| CN113281601A (en) * | 2021-06-18 | 2021-08-20 | 四川长虹空调有限公司 | Air conditioner EMI test method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108872880B (en) | 2019-11-22 |
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