CN100575980C - Switch power source EMI noise origin internal impedance test system and assay method - Google Patents
Switch power source EMI noise origin internal impedance test system and assay method Download PDFInfo
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- CN100575980C CN100575980C CN 200710024987 CN200710024987A CN100575980C CN 100575980 C CN100575980 C CN 100575980C CN 200710024987 CN200710024987 CN 200710024987 CN 200710024987 A CN200710024987 A CN 200710024987A CN 100575980 C CN100575980 C CN 100575980C
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Abstract
The invention discloses a kind of switch power source EMI noise origin internal impedance test system, constitute by line impedence stabilizing network, single current probe method impedance test module and spectrum analyzer; Power lead is directly inputted in the line impedence stabilizing network, by single current probe method impedance measuring module, then is input in Switching Power Supply and the load, constitutes a whole piece electric power loop; Then the response signal in this module is detected by spectrum analyzer.The internal impedance assay method is also disclosed simultaneously.System and method of the present invention both can carry out general internal impedance test at all kinds of noise sources, also can test various unknown impedances, and precision is higher, and simple to operate.By this method of testing, can judge that further the design for electromagnetic interface filter provides prerequisite to the character of internal impedance, promptly when Design of Filter, satisfy the impedance matching property of wave filter.
Description
Technical field
What the present invention relates to is to the origin internal impedance test system of Switching Power Supply conduction electromagnetic interference (EMI) noise source and the method for carrying out modeling, for conduction EMI Noise Suppression is that the design of electromagnetic interface filter provides the prerequisite basis, belong to the technical field of EMC Design.
Background technology
Electromagnetic interface filter is the effective measures that suppress electromagnetic interference (EMI), but at present both at home and abroad when carrying out the electromagnetic interface filter design, in advance and do not know the internal interference source and the impedance of noise source, often carries out a kind of general electromagnetic interface filter design.Because the matching relationship between interference source impedance and the filter impedance directly has influence on the filter effect of wave filter, estimates that accurately the Switching Power Supply internal driving has significance for effective inhibition of electromagnetic interference (EMI).
Summary of the invention
The objective of the invention is at the resistance matching problem of electromagnetic interface filter in the above-mentioned electromagnetic compatibility and the switch power source EMI noise origin internal impedance test system and the internal impedance modeling method that propose, it can provide perfect and economical and practical noise source test solution for enterprise and product design slip-stick artist, the present invention both can satisfy the general requirement of noise source modeling, financial cost is lower, can provide the good premise condition for the design of next step electromagnetic interface filter, effective inhibition of EMI noise again simultaneously.
Switch power source EMI noise origin internal impedance test system is made of line impedence stabilizing network, single current probe impedance test module and spectrum analyzer; It is characterized in that: power lead is directly inputted in the line impedence stabilizing network, by single current probe impedance measuring module, then is input in Switching Power Supply and the load, constitutes a whole piece electric power loop; Then detect by the response signal of spectrum analyzer to current probe in the module.
Described single current probe impedance test module adopts the common code impedance test module, detects the formula current probe and a signal generator is formed by a pair of common mode choke, two one of electric capacity; Two electric capacity are connected on respectively between L-E, the N-E; L, the N line of the output of line impedence stabilizing network are input to Switching Power Supply by a pair of common mode choke, and the output E line of line impedence stabilizing network is directly inputted to Switching Power Supply; Two lead penetrating current probes that two electric capacity link to each other with the E line, the output signal of signal generator is directly inputted in the capacitor loop, detects the formula current probe and connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.
Described two capacitor fixing are on printed circuit board (PCB), and described detection formula current probe is also fixed its position on circuit board simultaneously; Be connected for short-term between printing board PCB and testing apparatus.
Described single current probe impedance test module can also adopt the differential mode impedance test module, is detected by two differential mode choking coils, two electric capacity, one that the formula current probe is formed and a signal generator is formed; L, the N line of the output of line impedence stabilizing network are input to Switching Power Supply by 1 differential mode choking coil respectively, and the output E line of line impedence stabilizing network is directly inputted to Switching Power Supply, and two electric capacity also are connected between the L-N; Two lead penetrating current probes that two electric capacity link to each other with the E line, the output signal of signal generator is directly inputted in the capacitor loop, detects the formula current probe and connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.
Switch power source EMI noise origin internal impedance test system of the present invention is undertaken by line impedence stabilizing network (LISN), single current probe test module and spectrum analyzer; The power lead of coming from electrical network is directly inputted to the line impedence stabilizing network (LISN), by single current probe test module, then is input in Switching Power Supply (SMPS) and the load, constitutes a whole piece electric power loop; By spectrum analyzer the response signal in this module is detected.
In electric power loop, the effect of line impedence stabilizing network (LISN) is for Switching Power Supply provides power supply, and the noise of insulating power supply side enters test loop simultaneously, also the noise of isolating switch power generation, prevent to pollute electrical network, and the stable impedance of one 50 Ω is provided for test loop.Single current probe test module is used for the internal impedance of measuring switch power supply, and Switching Power Supply is a Devices to test.
Above-mentioned single current probe test module is divided into two parts of common mode test module and differential mode test module again.
The common mode test module detects the formula current probe by a pair of common mode choke, two electric capacity, one and a signal generator is formed.Power lead L, the N, the E that come from electrical network are directly inputted to the line impedence stabilizing network, L, the N line of the output of line impedence stabilizing network are input to Switching Power Supply by a pair of common mode choke, and the output E line of line impedence stabilizing network is directly inputted to Switching Power Supply, and two electric capacity are connected on respectively between L-E, the N-E.Two lead penetrating current probes that two electric capacity link to each other with the E line, the output signal of signal generator is directly inputted in the loop, electric capacity place, and current probe connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.Read the reading that detects on the examination current probe by inserting blocked impedance, short circuit, three kinds of states of Switching Power Supply operate as normal in the circuit, and the internal impedance of Switching Power Supply is calculated according to corresponding algorithm.
For making the internal driving Z of this test circuit
InCan repeat to measure and keep constant as far as possible, this two capacitor fixing is on printed circuit board (PCB), and current probe is also fixed its position on circuit board simultaneously; For short-term is connected, reducing the ghost effect that the lead layout causes, described short-term connects and is meant the existing the shortest connection that technology can be accomplished that connects between printing board PCB and testing apparatus.The test of this stationkeeping, in case after its advantage is the circuit calibration, the test circuit internal driving Z that records
InNot only be applicable to the common mode test, equally also be applicable to the differential mode test, can improve the speed of test greatly.
Described differential mode impedance test module detects the formula current probe and a signal generator is formed by two differential mode choking coils, two electric capacity, one; Power lead L, the N, the E that come from electrical network are directly inputted to the line impedence stabilizing network, L, the N line of the output of line impedence stabilizing network are input to Switching Power Supply by 1 differential mode choking coil respectively, and the output E line of line impedence stabilizing network is directly inputted to Switching Power Supply, and two electric capacity also are connected between the L-N; Two lead penetrating current probes that two electric capacity link to each other with the E line, the output signal of signal generator is directly inputted in the loop, electric capacity place, and current probe connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.
Noise source of switch power supply EMI internal impedance assay method of the present invention, its determination step is as follows:
Step 1: at first SMPS is removed from main circuit,, insert a blocked impedance R with L and N line short circuit
Std, the short circuit point of this impedance one termination L and N line, another termination E line; Main circuit center line impedance stable network no power, the output frequency of conditioning signal generator is got some spots in Conducted Electromagnetic compatibility test standard 10K-30MHz scope, read the reading on the corresponding frequency spectrum instrument respectively, record frequency spectrograph reading A1;
Step 2: with R
StdRemove, and with the short circuit point of L and N line and the short circuit of E line, main circuit center line impedance stable network no power, the output frequency of conditioning signal generator, corresponding with Frequency point in above-mentioned 1, record frequency spectrograph reading A2;
Step 3: in the SMPS line attachment, open main circuit power, the output frequency of conditioning signal generator, corresponding with Frequency point in above-mentioned 1, record frequency spectrograph reading A3;
Step 4: the calculating of switching power supply noise source internal impedance.
Apparatus of the present invention and method, both can carry out general internal impedance test at all kinds of noise sources, also can test various unknown impedances, precision is higher, and it is simple to operate, the detection formula current probe reading that obtains under normal impedance, short circuit and three kinds of situations of operate as normal by circuit only just can calculate the value of noise source impedance to be measured.By this method of testing, not only can determine the internal impedance value of noise source, can also be by amplitude and the phase information that calculates internal impedance, thereby can judge the character of internal impedance, that draw internal impedance and be capacitive or perception, further the design for electromagnetic interface filter provides prerequisite, promptly satisfies the impedance matching property of wave filter when Design of Filter, thereby effectively electromagnetic interference (EMI) is suppressed, make it to satisfy the EMC standard.
Description of drawings
Fig. 1 is a switch power source EMI noise origin internal impedance test system block diagram of the present invention;
Fig. 2 is switch power source EMI noise origin internal impedance test system of the present invention (common mode internal impedance) circuit diagram;
Fig. 3 is switch power source EMI noise origin internal impedance test system of the present invention (differential mode internal impedance) circuit diagram;
Fig. 4 is a noise source common mode internal impedance test curve;
Fig. 5 is a noise source differential mode internal impedance test curve.
Embodiment
Below in conjunction with specific embodiments and the drawings, the present invention is described in further detail.
Embodiment 1, as depicted in figs. 1 and 2, switch power source EMI noise origin internal impedance test system is made of line impedence stabilizing network, single current probe impedance test module and spectrum analyzer; Power lead is directly inputted in the line impedence stabilizing network, by single current probe impedance measuring module, then is input in Switching Power Supply and the load, constitutes a whole piece electric power loop; Then detect by the response signal of spectrum analyzer to current probe in the module.Single current probe impedance test module adopts the common code impedance test module, and described common code impedance test module detects the formula current probe by a pair of common mode choke, two one of electric capacity and a signal generator is formed; Two electric capacity are connected on respectively between L-E, the N-E; L, the N line of the output of line impedence stabilizing network are input to Switching Power Supply by a pair of common mode choke, and the output E line of line impedence stabilizing network is directly inputted to Switching Power Supply; Two lead penetrating current probes that two electric capacity link to each other with the E line, the output signal of signal generator is directly inputted in the capacitor loop, detects the formula current probe and connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.Described two capacitor fixing are on printed circuit board (PCB), and described detection formula current probe is also fixed its position on circuit board simultaneously; Be connected for short-term between printing board PCB and testing apparatus.
Embodiment 2, as shown in figures 1 and 3, substantially the same manner as Example 1, different is that single current probe impedance test module adopts the differential mode impedance test module, described differential mode impedance test module is detected by two differential mode choking coils, two electric capacity, one that the formula current probe is formed and a signal generator is formed; L, the N line of the output of line impedence stabilizing network are input to Switching Power Supply by 1 differential mode choking coil respectively, and the output E line of line impedence stabilizing network is directly inputted to Switching Power Supply, and two electric capacity also are connected between the L-N; Two lead penetrating current probes that two electric capacity link to each other with the E line, the output signal of signal generator is directly inputted in the capacitor loop, detects the formula current probe and connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.
Embodiment 3, be example with certain commercial Switching Power Supply, test, experimental provision as shown in Figure 1, be under the situation that connects normal impedance, short circuit and Switching Power Supply operate as normal at circuit respectively and test, test for switching power supply noise source internal impedance, main branch common mode, two kinds of situations of differential mode are tested, and both of these case removes impedance test module and has any different, and method of testing and step all are consistent.
Because V
MBe the output voltage of signal source, V
PBe the voltage at current probe two ends, I
WBe the electric current that detection formula current probe is inducted in the loop, Zin is the circuit internal impedance, and Zs is noise source impedance to be measured.Then:
V
M＝(Z
in+Z
S)I
W (1)
So can obtain
Z
TBe the current probe internal driving.The output of holding signal source is constant, then Z for given frequency
TV
MIt is a fixed value.With SMPS with a known measuring resistance R
StdSubstitute, and R
Std＞＞Z
In, then
Impedance Z is surveyed in short circuit
In
Switch on to Switching Power Supply at last
Obtain a result shown in Fig. 4,5.As can be seen from the figure the common mode internal impedance of noise source reduces along with increasing of frequency, is capacitive, through fitting, can obtain the common mode internal impedance and be made of the resistance of one 1.4 Ω and the capacitances in series of a 430pF.The differential mode internal impedance increases along with increasing of frequency, is perception, through fitting, can obtain the differential mode internal impedance and be made of the resistance of one 16 Ω and the inductance series connection of a 1.7uH.
After the common mode internal impedance of learning Switching Power Supply, just can carry out corresponding Design of Filter.Write out the transport function of wave filter according to noise source internal impedance, loaded impedance (known) and filter construction, secondly determine wave filter the cutoff frequency point, insert the maximum differential loss that loss, passband allow, calculate the value of each components and parts of wave filter at last.
Because the size of noise source impedance is the important evidence of Design of Filter, has only the impedance matching of working as during design, its filtering characteristic of performance of wave filter ability maximal efficiency.Otherwise, if internal impedance the unknown of noise source when carrying out the electromagnetic interface filter design, will be made as the internal impedance of noise source a general value (for example 50 Ω), and carry out a kind of design of universal filter.Because the type of each noise source is diversified, when adopting general electromagnetic interface filter, the problem of impedance mismatching will inevitably appear, and filter insertion loss is reduced, frequency is drifted about; Heavy then wave filter is amplified noise signal.So, various different types of noise source internal impedance is tested, as corresponding Design of Filter basis, can greatly improve the filtering characteristic of wave filter, save financial cost.
Claims (4)
1, a kind of switch power source EMI noise origin internal impedance test system is made of line impedence stabilizing network, single current probe impedance test module and spectrum analyzer; It is characterized in that: power lead is directly inputted in the line impedence stabilizing network, by single current probe impedance test module, then is input in Switching Power Supply and the load, constitutes a whole piece electric power loop; Then detect by the response signal of spectrum analyzer to current probe in the module.
2, switch power source EMI noise origin internal impedance test system according to claim 1, it is characterized in that: described single current probe impedance test module adopts the common code impedance test module, and described common code impedance test module detects the formula current probe by a pair of common mode choke, two one of electric capacity and a signal generator is formed; Two electric capacity are connected on respectively between live wire (L)-ground wire (E), center line (the N)-ground wire (E); Live wire (L), center line (N) line of the output of line impedence stabilizing network are input to Switching Power Supply by a pair of common mode choke, and the output ground wire (E) of line impedence stabilizing network is directly inputted to Switching Power Supply; Two lead penetrating current probes that two electric capacity link to each other with ground wire (E), the output signal of signal generator is directly inputted in the capacitor loop, detects the formula current probe and connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.
3, switch power source EMI noise origin internal impedance test system according to claim 2 is characterized in that: described two capacitor fixing are on printed circuit board (PCB), and described detection formula current probe is also fixed its position on circuit board simultaneously; Be connected for short-term between printing board PCB and testing apparatus.
4, switch power source EMI noise origin internal impedance test system according to claim 1, it is characterized in that: described single current probe impedance test module adopts the differential mode impedance test module, described differential mode impedance test module is detected by two differential mode choking coils, two electric capacity, one that the formula current probe is formed and a signal generator is formed; Live wire (L), the center line (N) of the output of line impedence stabilizing network are input to Switching Power Supply by 1 differential mode choking coil respectively, and the output ground wire (E) of line impedence stabilizing network is directly inputted to Switching Power Supply, and two electric capacity also are connected between live wire (L)-center line (N); Two lead penetrating current probes that two electric capacity link to each other with ground wire (E), the output signal of signal generator is directly inputted in the capacitor loop, detects the formula current probe and connects spectrum analyzer, and the DC side output of Switching Power Supply connects load.
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| CN114062783B (en) * | 2021-09-15 | 2024-02-23 | 中国航空工业集团公司西安飞机设计研究所 | Power supply compatibility test impedance network |
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