CN108845276A - A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor - Google Patents
A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor Download PDFInfo
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- CN108845276A CN108845276A CN201810930186.9A CN201810930186A CN108845276A CN 108845276 A CN108845276 A CN 108845276A CN 201810930186 A CN201810930186 A CN 201810930186A CN 108845276 A CN108845276 A CN 108845276A
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- Prior art keywords
- capacitor
- power supply
- switching power
- inductance
- resistance
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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
Abstract
The test macro for the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor that the present invention provides a kind of, including being mounted on the indoor signal source G1 of shielding, the signal source G1 is connected to test harness W after power amplification circuit and capacitor C1, test one end harness W is connected to the FireWire port port of Switching Power Supply G2, the other end is connected to the zero curve port of Switching Power Supply G2 through AC impedance stabilizing circuit, the positive output line of Switching Power Supply G2, negative output line is connected to DC impedance stabilizing circuit, DC impedance stabilizing circuit connects resistance R9, DC impedance stabilizing circuit is connected to receiver.The test macro of Switching Power Supply high-low pressure coupling attenuation characteristic of the present invention based on capacitor, structure is simple, clear principle substantially increases testing precision using the case where interference is coupled into harness by parasitic capacitance in the capacitive coupling simulating practical service environment of capacitor.
Description
Technical field
The invention belongs to technical field of electromagnetic compatibility measurement, especially relate to a kind of Switching Power Supply high-low pressure coupling based on capacitor
Close the test macro of attenuation characteristic.
Background technique
Switching Power Supply is a kind of DC power supply, using modern power electronics technology, controls the on-off of power tube, can be incited somebody to action
220V AC conversion is the direct current of 12V or 5V, is widely applied in industrial environment.Electromagnetic signal frequency band in industrial environment
Width, intensity is big, modulation system multiplicity.It is in complicated electromagnetic environment, electricity can be induced in the high-voltage wiring harness of Switching Power Supply
Magnetic harassing and wrecking.Even if do not work, Switching Power Supply still can provide circulation path for these harassing and wrecking signals, make harassing and wrecking signal can be with coupling
It is suitable to cross Switching Power Supply, and it is transferred to the load-side of Switching Power Supply.This is because inside Switching Power Supply there are electronic component, post
Raw capacitor and parasitic inductance etc., they constitute the circulation path of harassing and wrecking signal.In addition, harmonic wave present in power grid, other are total
The harassing and wrecking signal etc. that power-supply device generates can be coupled through Switching Power Supply by above-mentioned path, influence load-side.High-low pressure
Coupling attenuation characteristic (Ac) can describe the power of this effect.Ac is bigger, shows, height fewer by the harassing and wrecking of Switching Power Supply
Press the intensity of isolation bigger.The harassing and wrecking that on the contrary then explanation passes through Switching Power Supply are more, and the intensity of high and low voltage isolation is smaller.Know out
Powered-down source high-low pressure coupling attenuation characteristic helps to understand the electrical characteristic of Switching Power Supply, reduces the influence that extraneous harassing and wrecking generate.
There is presently no the test macros of Switching Power Supply high-low pressure coupling attenuation characteristic.
Summary of the invention
In view of this, the present invention is directed to propose a kind of test of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor
System is tested simultaneously with the test for realizing Switching Power Supply high-low pressure coupling attenuation characteristic in 0.15MHz~30MHz frequency range
The electrical isolation degree of Switching Power Supply high-voltage alternating side and low-voltage direct side.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor, including be mounted in screened room
Signal source G1, power amplification circuit, capacitor C1, Switching Power Supply G2, DC impedance stabilizing circuit, AC impedance stabilizing circuit,
Receiver and test harness W, the signal source G1 are connected to the test after the power amplification circuit and the capacitor C1
Harness W, described test one end harness W are connected to the FireWire port port of the Switching Power Supply G2, and the other end is steady through the AC impedance
Circuit connection is determined to the zero curve port of the Switching Power Supply G2, and the output port of the Switching Power Supply G2 is connected to the direct current resistance
Anti- stabilizing circuit, the DC impedance stabilizing circuit are connected to the receiver.
Further, the power amplification circuit includes power amplifier U1, the positive input of the power amplifier U1
End and negative input are connected to the both ends of the signal source G1 through resistance R3, resistance R1 respectively, the power amplifier U1's
Resistance R2 is connected between negative input and output end, the output end of the power amplifier U1 is connected to the capacitor C1, institute
The total length between power amplifier U1 and the test harness W is stated no more than 100mm.
Further, the AC impedance stabilizing circuit include capacitor C2, capacitor C3, capacitor C4, capacitor C5, inductance L1 and
Inductance L2, one end of the inductance L1 are connected to the test harness W, the common end of test the harness W and the inductance L1
It is grounded after the capacitor C4, resistance R6, the other end of the inductance L1 is grounded after the capacitor C2, resistance R4, the electricity
One end of sense L2 is connected to the zero curve port of the Switching Power Supply G2, the inductance L2 and the Switching Power Supply G2 zero curve port
Common end is grounded after the capacitor C5 and resistance R7, and the other end of the inductance L2 is followed by through the capacitor C3 and resistance R5
Ground.
Further, the DC impedance stabilizing circuit include capacitor C6, capacitor C7, capacitor C8, capacitor C9, inductance L3 and
Inductance L4, one end of the inductance L3 are connected to the positive output line of the Switching Power Supply G2, are grounded after the capacitor C6, separately
One end is connected to one end of the inductance L4 through resistance R9, and the common end of the resistance R9 and the inductance L3 are through the capacitor C7
It is grounded with after resistance R8, the common end of the resistance R9 and the inductance L4 are grounded through after the capacitor C9 and resistance R10, institute
State that resistance R10 is in parallel with the receiver, the other end of the inductance L4 be connected to the Switching Power Supply G2 negative output line,
It is grounded after the capacitor C8.
Further, the model CIT-10 of the signal source.
Further, the model ESL3 of the receiver.
Further, the resistance value of the R9 is 50 Ω.
Further, the specification of the capacitor C1 is 100nF.
Further, the common end of the capacitor C1 and the test harness W are to the Switching Power Supply G2 FireWire port port
Length is not more than 50mm.
Compared with the existing technology, the test of the Switching Power Supply high-low pressure coupling attenuation characteristic of the present invention based on capacitor
System has the advantage that：
(1) test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic of the present invention based on capacitor, system letter
Single easy, clear principle, can realize test using common 100nF capacitor, testing cost is lower；Utilize the capacitive of capacitor
The case where interference is coupled into harness by parasitic capacitance in coupled simulation practical service environment, substantially increases testing precision.
(2) test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic of the present invention based on capacitor, direct current resistance
Anti- stabilizing circuit is used for DC circuit, can provide stable impedance and filtering, moreover it is possible to and it extracts test signal and is output to receiver,
Greatly reduce the complexity and production cost of system.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor described in the embodiment of the present invention
Circuit diagram.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor, as shown in Figure 1, including installation
Shielding indoor signal source G1, power amplification circuit, capacitor C1, Switching Power Supply G2, DC impedance stabilizing circuit, AC impedance
Stabilizing circuit, receiver and test harness W, the signal source G1 is connected to after the power amplification circuit and the capacitor C1
The test harness W, described test one end harness W are connected to the FireWire port port of the Switching Power Supply G2, and the other end is through the friendship
Flow impedance stabilizing circuit is connected to the zero curve port of the Switching Power Supply G2, and the output port of the Switching Power Supply G2 is connected to institute
DC impedance stabilizing circuit is stated, the DC impedance stabilizing circuit is connected to the receiver, and the system is for testing 0.15MHz
Switching Power Supply high-low pressure coupling attenuation characteristic in~30MHz frequency range, understanding Switching Power Supply high-voltage alternating side and low-voltage direct side
Electrical isolation degree, capacitor C1 will test signal and be injected into test harness W, realization test purpose that can be simple, cheap.
The power amplification circuit includes power amplifier U1, and the positive input and negative sense of the power amplifier U1 is defeated
Enter the both ends that end is connected to the signal source G1 through resistance R3, resistance R1 respectively, the negative input of the power amplifier U1
Resistance R2 is connected between output end, the output end of the power amplifier U1 is connected to the capacitor C1, the power amplification
Total length between device U1 and the test harness W is not more than 100mm.
The AC impedance stabilizing circuit includes capacitor C2, capacitor C3, capacitor C4, capacitor C5, inductance L1 and inductance L2, institute
The one end for stating inductance L1 is connected to the test harness W, and the common end of the test harness W and inductance L1 is through the capacitor
It is grounded after C4, resistance R6, the other end of the inductance L1 is grounded after the capacitor C2, resistance R4, one end of the inductance L2
It is connected to the zero curve port of the Switching Power Supply G2, the common end of the inductance L2 and the Switching Power Supply G2 zero curve port is through institute
It is grounded after stating capacitor C5 and resistance R7, the other end of the inductance L2 is grounded after the capacitor C3 and resistance R5, AC impedance
Stabilizing circuit can provide the stabilization impedance of 50 Ω in test frequency range, guarantee the consistency of test；There is filtering simultaneously
Effect.
The DC impedance stabilizing circuit includes capacitor C6, capacitor C7, capacitor C8, capacitor C9, inductance L3 and inductance L4, institute
The one end for stating inductance L3 is connected to the positive output line of the Switching Power Supply G2, is grounded after the capacitor C6, and the other end is through electricity
Resistance R9 is connected to one end of the inductance L4, and the common end of the resistance R9 and the inductance L3 are through the capacitor C7 and resistance R8
After be grounded, the common end of the resistance R9 and the inductance L4 are grounded through after the capacitor C9 and resistance R10, the resistance
R10 is in parallel with the receiver, and the other end of the inductance L4 is connected to the negative output line of the Switching Power Supply G2, through described
It is grounded after capacitor C8, the resistance value of the R9 is 50 Ω, the actual loading for analog switched power supply G2；DC impedance stabilizing circuit
Stablize impedance and filtering in addition to providing 50 Ω, test signal can also be extracted, be output to receiver.
The model CIT-10 of the signal source.
The model ESL3 of the receiver.
The specification of the capacitor C1 is 100nF, and specification is common, cheap, greatly reduces testing cost.
The length of common end to the Switching Power Supply G2 FireWire port port of the capacitor C1 and the test harness W is not more than
50mm。
A kind of working principle of the test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor is：Signal source
G1 generate small magnitude test signal, test signal after power amplification circuit amplifies, by the capacitor C1 of 100nF export to
Harness W is tested, and generates voltage V in the high-voltage alternating side of Switching Power Supply G2input=1V (120dB μ V) and test signal.Switch
Electronic component and parasitic parameter inside power supply G2 provide circulation path for test signal, therefore test signal can be coupled through
Switching Power Supply G2, DC impedance stabilizing circuit can extract the test signal of low-voltage direct side, the test signal of high-voltage alternating side
Certain decaying is had after Switching Power Supply G2, is believed using the test after the decaying of receiver measurement artificial network's circuit output
Number amplitude (Voutput)；
Ac=Vinput-VoutputFormula 1
Utilize the high-low pressure coupling attenuation coefficient of the available Switching Power Supply of formula 1.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor, it is characterised in that：Including installation
Shielding indoor signal source G1, power amplification circuit, capacitor C1, Switching Power Supply G2, DC impedance stabilizing circuit, AC impedance
Stabilizing circuit, receiver and test harness W, the signal source G1 is connected to after the power amplification circuit and the capacitor C1
The test harness W, described test one end harness W are connected to the FireWire port port of the Switching Power Supply G2, and the other end is through the friendship
Flow impedance stabilizing circuit is connected to the zero curve port of the Switching Power Supply G2, and the output port of the Switching Power Supply G2 is connected to institute
DC impedance stabilizing circuit is stated, the DC impedance stabilizing circuit is connected to the receiver.
2. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 1,
It is characterized in that：The power amplification circuit includes power amplifier U1, the positive input of the power amplifier U1 and negative
It is connected to the both ends of the signal source G1 through resistance R3, resistance R1 respectively to input terminal, the negative sense of the power amplifier U1 is defeated
Enter connection resistance R2, the output end of the power amplifier U1 between end and output end and is connected to the capacitor C1, the power
Total length between amplifier U1 and the test harness W is not more than 100mm.
3. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 1,
It is characterized in that：The AC impedance stabilizing circuit includes capacitor C2, capacitor C3, capacitor C4, capacitor C5, inductance L1 and inductance
L2, one end of the inductance L1 are connected to the test harness W, and the common end of the test harness W and inductance L1 is through institute
It is grounded after stating capacitor C4, resistance R6, the other end of the inductance L1 is grounded after the capacitor C2, resistance R4, the inductance L2
One end be connected to the zero curve port of the Switching Power Supply G2, the inductance L2 and the Switching Power Supply G2 zero curve port it is public
End is grounded after the capacitor C5 and resistance R7, and the other end of the inductance L2 is grounded after the capacitor C3 and resistance R5.
4. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 1,
It is characterized in that：The DC impedance stabilizing circuit includes capacitor C6, capacitor C7, capacitor C8, capacitor C9, inductance L3 and inductance
L4.One end of the inductance L3 is connected to the positive output line of the Switching Power Supply G2, is grounded after the capacitor C6, the other end
It is connected to one end of the inductance L4 through resistance R9, the common end of the resistance R9 and the inductance L3 are through the capacitor C7 and electricity
It is grounded after resistance R8, the common end of the resistance R9 and the inductance L4 are grounded through after the capacitor C9 and resistance R10, the electricity
Resistance R10 is in parallel with the receiver, and the other end of the inductance L4 is connected to the negative output line of the Switching Power Supply G2, through institute
It is grounded after stating capacitor C8.
5. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 1,
It is characterized in that：The model CIT-10 of the signal source.
6. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 1,
It is characterized in that：The model ESL3 of the receiver.
7. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 4,
It is characterized in that：The resistance value of the R9 is 50 Ω.
8. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 1,
It is characterized in that：The specification of the capacitor C1 is 100nF.
9. a kind of test macro of Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor according to claim 1,
It is characterized in that：The capacitor C1 and it is described test harness W common end to the Switching Power Supply G2 FireWire port port length not
Greater than 50mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810930186.9A CN108845276A (en) | 2018-08-15 | 2018-08-15 | A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810930186.9A CN108845276A (en) | 2018-08-15 | 2018-08-15 | A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor |
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| CN108845276A true CN108845276A (en) | 2018-11-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308258A (en) * | 2020-04-09 | 2020-06-19 | 上海捷氢科技有限公司 | System and method for testing high-low voltage coupling mechanism |
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| CN204231341U (en) * | 2014-11-14 | 2015-03-25 | 北京泛在互联科技有限公司 | A kind of voltage Power Line Carrier Channel comprehensive test device |
| CN208795829U (en) * | 2018-08-15 | 2019-04-26 | 中汽研（天津）汽车工程研究院有限公司 | A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor |
-
2018
- 2018-08-15 CN CN201810930186.9A patent/CN108845276A/en active Pending
Patent Citations (3)
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| CN1537365A (en) * | 2001-03-29 | 2004-10-13 | ��ķ���ع�˾ | Coupling circuit for power line communications |
| CN204231341U (en) * | 2014-11-14 | 2015-03-25 | 北京泛在互联科技有限公司 | A kind of voltage Power Line Carrier Channel comprehensive test device |
| CN208795829U (en) * | 2018-08-15 | 2019-04-26 | 中汽研（天津）汽车工程研究院有限公司 | A kind of test macro of the Switching Power Supply high-low pressure coupling attenuation characteristic based on capacitor |
Non-Patent Citations (1)
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| CN111308258A (en) * | 2020-04-09 | 2020-06-19 | 上海捷氢科技有限公司 | System and method for testing high-low voltage coupling mechanism |
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