JP5851364B2 - Electromagnetic interference measurement device and electromagnetic interference evaluation system - Google Patents

Description

  The present invention relates to an electromagnetic interference wave measuring apparatus and an electromagnetic interference wave evaluation system.

Conventionally, for example, in an inverter device, a common mode current and a common mode voltage measured by a current measuring device and a voltage measuring device are frequency-converted by a fast Fourier transform process, and a common mode voltage is common for each frequency band divided into a predetermined number. A method is known in which impedance characteristic data with respect to frequency is created by dividing by a mode current to calculate impedance, and noise countermeasures are taken according to the impedance characteristic data (see, for example, Patent Document 1).
Conventionally, for example, as a system impedance simulation unit that supplies a reference impedance for testing of a power converter, an impedance can be arbitrarily set by using a pseudo power supply network (LISN: Line Impedance Stabilisation Networks). A test apparatus is known (see, for example, Patent Document 2).

JP 2009-290938 A JP 2010-217043 A

  By the way, according to the electromagnetic interference wave grasped by the measurement and the test according to the above-mentioned prior art, it is difficult to predict the influence on the receiver mounted on the vehicle, for example, There is a problem in that the propagation characteristics of the interference wave cannot be accurately grasped and appropriate noise countermeasures cannot be taken.

  The present invention has been made in view of the above circumstances, and an electromagnetic interference wave measuring apparatus capable of measuring in detail an electromagnetic interference wave generated from an electrical / electronic component and an in-vehicle receiver of the electromagnetic interference wave generated from the electrical / electronic component. It is an object of the present invention to provide an electromagnetic interference evaluation system capable of accurately predicting the influence on the environment.

  In order to solve the above-described problems and achieve the object, an electromagnetic interference wave measuring apparatus according to the first invention of the present invention includes a single electric component (for example, in the embodiment) sequentially connected in series. Electrical and electronic component 2), common mode noise detection means (for example, common mode noise detection section 21 in the embodiment), and normal mode noise detection means (for example, first normal mode noise detection section 22 in the embodiment) And a second normal mode noise detection unit 23 and a normal mode noise detection unit 70), and the common mode noise detection unit separates the common mode noise from the normal mode noise (for example, an embodiment). Noise separation unit 31 and noise separation unit 61) and a plurality of different termination resistance values to measure the magnitude of the common mode noise Common mode noise estimation means for estimating the internal impedance and magnitude of the common mode noise in the electrical / electronic component based on the amount of change in the measurement result according to the change in the termination resistance value (for example, in the embodiment) And the normal mode noise detecting means measures the magnitude of the normal mode noise with a plurality of different termination resistance values, and the result of the measurement according to the change in the termination resistance value Normal mode noise estimation means for estimating the internal impedance and magnitude of the normal mode noise in the electric / electronic component based on the change amount of the electronic component (for example, the electronic measuring instrument 42, the electronic measuring instrument 52, and the electronic measuring instrument in the embodiment) 72).

  Further, in the electromagnetic interference wave measuring apparatus according to the second invention of the present invention, the separation means is a first attenuation means for attenuating the common mode noise (for example, the first common mode choke coil 33 in the embodiment, 63), second attenuation means for attenuating the normal mode noise (for example, the second common mode choke coils 34 and 64 in the embodiment), the normal mode noise is short-circuited to the ground, and the common mode noise is reduced. Voltage induction means for inducing a voltage in the common mode noise estimation means (for example, the third common mode choke coils 35 and 65 in the embodiment).

Furthermore, in the electromagnetic interference wave measuring apparatus according to the third aspect of the present invention, each of the first attenuation means and the voltage inducing means includes N windings (for example, in the embodiment) with an integer N of 2 or more. One N-phase common mode choke coil (for example, the first common in the embodiment) having windings 33H and 33L, windings 63U, 63V, and 63W, windings 35H and 35L, and windings 65U, 65V, and 65W Mode choke coils 33 and 63 and third common mode choke coils 35 and 65), and the second attenuating means includes a pair of windings (for example, a pair of windings 64A and 64B in the embodiment). second common mode choke coil 34 of the common mode choke coil of the _N C ₂ pieces of single-phase by a combination that does not allow overlap (e.g., in the embodiments having a common mode choke coil 64U , 64VW, comprising a 64WU), said voltage inducing means includes a resistor for connecting both ends of the winding (e.g., a pair of resistor 37H in the embodiment, comprises 37L, resistors 69U, 69V, and 69W).

  Furthermore, in the electromagnetic interference wave measuring apparatus according to a fourth aspect of the present invention, the voltage inducing means is a load that is symmetric with respect to the N windings of the common mode choke coil (for example, in the embodiment). Terminal resistor 32R, first resistor 81, switching termination resistor 39 and resistor 37H, and second resistor 82, second resistor 82 and resistor 37L).

  Furthermore, in the electromagnetic interference wave measuring apparatus according to the fifth aspect of the present invention, the normal mode noise detection means includes extraction means (for example, a noise separation unit 71 in the embodiment) for extracting the normal mode noise. The extraction unit includes a blocking unit that blocks the normal mode noise (for example, the normal mode noise blocking unit 73 in the embodiment) and a common mode noise attenuation unit that attenuates the common mode noise (for example, the embodiment). First common mode choke coil 74) and normal mode noise voltage inducing means for inducing the voltage of the normal mode noise in the normal mode noise estimating means (for example, an embodiment) And a second common mode choke coil 75).

  An electromagnetic interference evaluation system according to a sixth aspect of the present invention includes an electromagnetic interference measurement apparatus according to the first aspect, an in-vehicle receiver (for example, in-vehicle receiver 3 in the embodiment), Propagation characteristic acquisition means (for example, a propagation characteristic acquisition unit 11 in the embodiment) for acquiring the propagation characteristics of electromagnetic interference waves from the electrical / electronic component to the vehicle-mounted receiver, and the electromagnetic interference measurement apparatus Based on the internal impedance and the magnitude of the common mode noise and the normal mode noise and the propagation characteristic acquired by the propagation characteristic acquisition unit, a pseudo electromagnetic interference wave is generated, and the pseudo electromagnetic interference Signal generating means (for example, the RF signal predicting unit 12 and the signal generator 13 in the embodiment) for inputting a wave to the in-vehicle receiver.

  Further, in the electromagnetic interference evaluation system according to a seventh aspect of the present invention, the propagation characteristic acquisition means includes the electric and electronic components connected to the internal impedance of the common mode noise connected in series and the normal on the high side. Modeled as a signal source comprising the internal impedance of mode noise, the internal impedance of the common mode noise connected in series and the internal impedance of the normal mode noise on the low side, and the normal mode noise detection A first detection unit that detects the normal mode noise on the high side (for example, the first normal mode noise detection unit 22 in the embodiment) and a second detection unit that detects the normal mode noise on the low side. Detection means (for example, the second normal mode sensor in the embodiment) Comprises a's detection unit 23), the.

According to the electromagnetic interference wave measuring apparatus according to the first aspect of the present invention, the measurement of the conductive interference wave generated from a single electric / electronic component can be performed separately into common mode noise and normal mode noise. Accordingly, the internal impedance and magnitude (for example, output voltage) of common mode noise and normal mode noise in the electrical / electronic component can be estimated.
Furthermore, as countermeasures and countermeasures for electric and electronic components for reducing common mode noise and normal mode noise, it is possible to select different countermeasures and countermeasures for common mode noise and normal mode noise.

Further, common mode noise and normal mode noise are separated in the preceding common mode noise detecting means connected in series to the electrical / electronic component, and normal in the subsequent normal mode noise detecting means connected in series to the common mode noise detecting means. Measure mode noise.
Thereby, for example, the apparatus configuration can be simplified as compared with the case where the normal mode noise detecting means also includes a configuration for separating the common mode noise and the normal mode noise.

According to the electromagnetic interference wave measuring apparatus of the second aspect of the present invention, the signal in which the common mode noise is attenuated by the first attenuation means can be input to the normal mode noise detection unit, and the measurement accuracy of the normal mode noise is increased. Can be improved.
In addition, the normal mode noise is attenuated by the second attenuating means, and the normal mode noise is short-circuited to the ground by the voltage inducing means, whereby the common mode noise measurement accuracy by the common mode noise estimating means can be improved.
Furthermore, by inducing the voltage of the common mode noise in the common mode noise estimation means, it is possible to accurately stabilize the impedance of only the common mode noise with the termination resistance value serving as a desired reference.

  According to the electromagnetic disturbance measuring apparatus according to the third aspect of the present invention, for example, when three or more signal lines are connected to the electric / electronic component, or a pair connected to the electric / electronic component is formed. N-phase common mode choke coil for attenuating common mode noise and single phase for attenuating normal mode noise even when measuring conductive interference (conducting emissions) for multiple pairs of signal lines By using the common mode choke coil, it is possible to appropriately attenuate only the desired noise.

  According to the electromagnetic interference wave measuring apparatus of the fourth aspect of the present invention, uniform frequency characteristics can be obtained in a wide band.

  According to the electromagnetic interference wave measuring apparatus of the fifth aspect of the present invention, the separation ratio between common mode noise and normal mode noise can be improved.

  According to the electromagnetic interference evaluation system according to the sixth aspect of the present invention, the electromagnetic interference to the vehicle-mounted receiver is based on the internal impedance and magnitude of the common mode noise and normal mode noise estimated by the electromagnetic interference measurement device. Interfering waves can be accurately predicted.

  Furthermore, the propagation characteristics of the electromagnetic interference wave from the electrical / electronic component to the vehicle-mounted receiver can be acquired by electromagnetic field simulation or the like, and a plurality of different characteristics can be obtained only by a single measurement by the electromagnetic interference wave measuring device for a single electrical / electronic component. It is possible to accurately predict the influence of electromagnetic interference waves on patterns (for example, other vehicles having different harness routing forms or different bodies).

  Thereby, since the measurement is completed only by the measurement of the conducted emission, the time required for the measurement of the radiated emission, an expensive anechoic chamber, etc. are not required, and the occurrence of an error accompanying the measurement of the radiated emission can be prevented.

  Furthermore, by multiplying the estimation results of common mode noise and normal mode noise estimated by the electromagnetic interference measurement device with the propagation characteristics of electromagnetic interference acquired by the propagation characteristics acquisition means, With respect to the influence of the electromagnetic interference wave, a result equivalent to the test result in an actual vehicle can be obtained easily and accurately.

  According to the electromagnetic interference evaluation system of the seventh aspect of the present invention, the electric and electronic modeled as a signal source having the internal impedance of the common mode noise and the internal impedance of the normal mode noise on the high side and the low side The propagation characteristics of electromagnetic interference waves can be obtained with high accuracy by electromagnetic field simulation on components.

It is a block diagram of the electromagnetic interference wave evaluation system which concerns on embodiment of this invention. It is a block diagram of the electromagnetic interference wave measuring apparatus which concerns on embodiment of this invention. It is a graph which shows the example of the correspondence of change amount (DELTA) V of the measurement result accompanying switching of termination resistance value, and the internal impedance Im of noise in the electromagnetic interference wave measuring device which concerns on embodiment of this invention. It is a block diagram of the electrical and electronic component modeled in the electromagnetic disturbance evaluation system which concerns on embodiment of this invention. It is a figure which shows distribution path IC, IN of each electric current of common mode noise and normal mode noise in the electromagnetic interference wave evaluation system which concerns on embodiment of this invention. It is a figure which shows the system A with which predetermined electromagnetic field simulation is performed by the electromagnetic interference wave evaluation system which concerns on embodiment of this invention, and the system B with which measurement by a network analyzer etc. is performed. It is a flowchart which shows operation | movement of the electromagnetic interference wave evaluation system which concerns on embodiment of this invention. It is a flowchart which shows operation | movement of the electromagnetic interference wave measuring apparatus which concerns on embodiment of this invention. It is a block diagram of the common mode noise detection part of the electromagnetic interference wave measuring apparatus which concerns on the 1st modification of embodiment of this invention. It is a block diagram of the normal mode noise detection part of the electromagnetic interference wave measuring apparatus which concerns on the 2nd modification of embodiment of this invention. It is a block diagram of the normal mode noise detection part of the electromagnetic interference wave measuring apparatus which concerns on the 3rd modification of embodiment of this invention. It is a block diagram of the common mode noise detection part of the electromagnetic interference wave measuring apparatus which concerns on the 4th modification of embodiment of this invention. It is a block diagram of the common mode noise detection part of the electromagnetic interference wave measuring apparatus which concerns on the 5th modification of embodiment of this invention.

  Hereinafter, an electromagnetic interference measuring apparatus and an electromagnetic interference evaluation system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

In the electromagnetic interference wave evaluation system 1 according to this embodiment, for example, an electromagnetic interference wave generated from a single electric / electronic component 2 is applied to the vehicle-mounted receiver 3 with respect to the electric / electronic component 2 and the vehicle-mounted receiver 3 mounted on the vehicle. Evaluate the effect on the behavior of
For example, as shown in FIG. 1, the electromagnetic interference wave evaluation system 1 includes a single electric / electronic component 2 and a vehicle-mounted receiver 3, an electromagnetic interference measurement device 10, a propagation characteristic acquisition unit 11, and an RF signal prediction unit 12. The signal generator 13 is provided.

The electromagnetic interference wave measuring apparatus 10 measures, for example, a conductive interference wave (conductive emission) propagating through a connection line among electromagnetic interference (EMI) waves generated from the electrical / electronic component 2. To do.
For example, as shown in FIG. 2, the electromagnetic interference wave measuring apparatus 10 includes a common mode noise detection unit 21, a first normal mode noise detection unit 22, a second normal mode noise detection unit 23, and a power supply 24. ing.

The common mode noise detection unit 21 includes, for example, a noise separation unit 31 and an electronic measuring instrument 32.
The noise separation unit (CommonLISN) 31 includes, for example, a line impedance stabilization network (LISN) and the like, and noise generated at the high-side and low-side input terminals 21H and 21L connected to the electrical / electronic component 2 Is separated into common mode noise and normal mode noise. The separated common mode noise is output to the high side and low side common mode output terminals 21CH and 21CL, and the separated normal mode noise is output to the high side and low side normal mode output terminals 21NH and 21NL.

  The noise separation unit 31 includes, for example, three first to third common mode choke coils 33, 34, and 35, a pair of capacitors 36H and 36L, a pair of resistors 37H and 37L, and a termination resistor changeover switch 38. , And a switching termination resistor 39.

The first common mode choke coil 33 includes, for example, a pair of windings 33H and 33L and a core 33C.
For example, the pair of windings 33H and 33L that are electromagnetically coupled via the core 33C does not exhibit inductance with respect to normal mode noise so that the inductance with respect to common mode noise is larger than the inductance with respect to normal mode noise. It is wound around.
The winding 33H is inserted into a normal mode connection line 21NA that connects the high-side input terminal 21H and the high-side normal mode output terminal 21NH, and the winding 33L includes a low-side input terminal 21L and a low-side normal mode output terminal 21NL. Is inserted into the normal mode connection line 21NB.

  For example, the first common mode choke coil 33 attenuates the common mode noise by generating a mutual inductance between the normal mode connection lines 21NA and 21NB, and allows the normal mode noise to pass through without being attenuated.

  The windings 33H and 33L are constituted by, for example, coaxial cables, and suppress the attenuation of normal mode noise while maintaining the attenuation of common mode noise. Further, the windings 33H and 33L can further suppress the attenuation of the normal mode noise, for example, by impedance matching the end of the coaxial cable.

The second common mode choke coil 34 includes, for example, a pair of windings 34H and 34L and a core 34C.
For example, the pair of windings 34H and 34L electromagnetically coupled via the core 34C does not exhibit inductance with respect to common mode noise so that the inductance with respect to normal mode noise becomes larger than the inductance with respect to common mode noise. It is wound around.

The third common mode choke coil 35 includes, for example, a pair of windings 35H and 35L and a core 35C.
For example, the pair of windings 35H and 35L that are electromagnetically coupled via the core 35C does not exhibit inductance with respect to normal mode noise so that the inductance with respect to common mode noise is larger than the inductance with respect to normal mode noise. It is wound around.
The windings 35H and 35L are composed of, for example, a coaxial cable, and suppress the attenuation of normal mode noise while maintaining the attenuation of common mode noise. Furthermore, the windings 35H and 35L can further suppress the attenuation of the normal mode noise, for example, by impedance matching the end of the coaxial cable.

  The capacitor 36H, the winding 34H, and the winding 35H are, for example, sequentially connected in series and inserted into the common mode connection line 21CA that connects the high-side input terminal 21H and the ground point, and the capacitor 36L, For example, 34L and winding 35L are sequentially connected in series and inserted into common mode connection line 21CB that connects low-side input terminal 21L and the ground point.

The pair of windings 34H and 34L of the second common mode choke coil 34 is configured so that, for example, current flows in opposite directions (that is, current flows in the differential mode), and the common mode connection line 21CA, It is inserted into 21CB.
For example, the second common mode choke coil 34 attenuates normal mode noise by generating mutual inductance between the common mode connection lines 21CA and 21CB, and allows the common mode noise to pass therethrough without being attenuated.

  For example, as shown in FIG. 2, the second common mode choke coil 34 may be connected in reverse to the connection of the normal common mode choke coil, or wound so as to generate a reverse phase voltage. Alternatively, a configuration in which an intermediate point of a winding of a normal common mode choke coil is drawn out may be employed.

Both ends of the winding 35H of the third common mode choke coil 35 are connected to the high side and low side common mode output terminals 21CH and 21CL.
The resistor 37H is connected between both ends of the winding 35H of the third common mode choke coil 35, for example, and the resistor 37L is connected between both ends of the winding 35L of the third common mode choke coil 35, for example.

The third common mode choke coil 35 passes normal mode noise to the ground point (ground short circuit) by, for example, generating mutual inductance between the common mode connection lines 21CA and 21CB.
The third common mode choke coil 35 and the pair of resistors 37H and 37L induce, for example, a voltage across the resistor 37L due to common mode noise between the high side and low side common mode output terminals 21CH and 21CL by a transformer function. To do.

  The termination resistance changeover switch 38 and the switching termination resistance 39 are connected in series between the high-side and low-side common mode output terminals 21CH and 21CL, for example.

The electronic measuring instrument 32 includes, for example, a measuring instrument that quantifies the noise magnitude (level, etc.) including time fluctuations, such as a vector signal analyzer, a spectrum analyzer, and an oscilloscope. The voltage of noise (for example, common mode noise) output from the output terminals 21CH and 21CL is measured.
The electronic measuring instrument 32 includes, for example, a termination resistor 32R that connects between the high-side and low-side common mode output terminals 21CH and 21CL.

  For example, the electronic measuring instrument 32 measures the common mode noise with the first termination resistance value (for example, 50Ω) according to the resistance value (for example, 50Ω) of the termination resistor 32R in the open state of the termination resistance changeover switch 38. To do. On the other hand, in the closed state of the termination resistor changeover switch 38, the combination of the resistance value of the switching termination resistor 39 (for example, 50Ω which is the same as the resistance value of the termination resistor 32R) and the resistance value of the termination resistor 32R (for example, 50Ω). The common mode noise is measured with a second termination resistance value (for example, 25Ω) according to the above.

For example, the electronic measuring instrument 32 is based on the change in the measurement result according to the change in the termination resistance value when the termination resistance changeover switch 38 is switched between open and closed. Estimate impedance.
Based on the estimation result of the internal impedance, the output voltage of the common mode noise in the single electric / electronic component 2 is estimated.

For example, for a common mode noise of an appropriate output voltage V (x) having an appropriate internal impedance Im (x) in a single electric / electronic component 2, a first termination resistance value (for example, 50Ω) and a second termination The measurement result of the voltage of the common mode noise at the resistance value (for example, 25Ω) changes to V (50Ω) and V (25Ω) as shown in the following formula (1), for example.
That is, when the termination resistance value is changed between a first termination resistance value (for example, 50Ω) and a second termination resistance value (for example, 25Ω) by switching between opening and closing of the termination resistance selector switch 38, the internal impedance is changed. The voltage division ratio between Im (x) and the termination resistance value changes. Then, according to the change in the voltage dividing ratio, the measurement result of the voltage of the common mode noise changes between V (50Ω) and V (25Ω).

  The electronic measuring instrument 32 is, for example, a single unit as shown in the following formula (2) based on a change amount ΔV due to a change in the measurement result of the voltage of the common mode noise between V (50Ω) and V (25Ω). The internal impedance Im (25Ω → 50Ω) of the common mode noise in the electrical / electronic component 2 is estimated.

Note that the first termination resistance value and the second termination resistance value, which are changed by switching the termination resistance changeover switch 38 between opening and closing, can be changed depending on the internal impedance Im (x) or the like. Good.
For example, in FIG. 3, when the first termination resistance values are sequentially set to 25Ω, 50Ω, and 50Ω, and the second termination resistance values are sequentially set to 50Ω, 100Ω, and 500Ω, the variation ΔV and the internal impedance Im (x ) Was shown as an example.
For example, in FIG. 3, when the termination resistance value deviates more than a predetermined reference termination resistance value of 50Ω, reflection of the electromagnetic interference wave between the electromagnetic interference wave measuring apparatus 10 and the electric / electronic component 2 becomes large. .
In order to suppress the reflection of the electromagnetic interference wave between the electromagnetic interference wave measuring apparatus 10 and the electric / electronic component 2, the distance of connection between the electromagnetic interference wave measuring apparatus 10 and the electric / electronic component 2 by a harness or the like is a predetermined distance. (For example, λ / 10 or λ / 20 depending on the wavelength λ of the electromagnetic interference wave) may be set below.

  For example, as shown in the following formula (3), the electronic measuring instrument 32 is configured to calculate the voltage of the common mode noise with the internal impedance Im (25Ω → 50Ω) of the common mode noise and the first termination resistance value (for example, 50Ω). Based on the measurement result (for example, V (50Ω) or the like), the output voltage P (50Ω) of the common mode noise is estimated.

The first normal mode noise detection unit 22 includes, for example, a pseudo power supply circuit network 41 and an electronic measuring instrument 42.
The pseudo power supply circuit network (NormalLISN) 41 includes, for example, a line impedance stabilization network (LISN) and the like, and is connected to the high-side normal mode output terminal 21NH of the common mode noise detection unit 21. A normal mode input terminal 22H, a high-side power supply terminal 22PH connected to the positive electrode of the power supply 24, and first high-side and low-side normal mode output terminals 22NH and 22NL are provided.

  The pseudo power supply network 41 includes, for example, a winding 43, a first capacitor 44 and a first resistor 45, a second capacitor 46 and a second resistor 47, a termination resistor changeover switch 48, and a switching termination resistor 49. I have.

For example, the winding 43 is inserted into a connection line 22HL that connects the high-side normal mode input terminal 22H and the high-side power supply terminal 22PH.
The high-side normal mode input terminal 22H is connected to the ground point via, for example, a first capacitor 44 and a first resistor 45 that are sequentially connected in series.
The high-side power supply terminal 22PH is connected to the ground point via, for example, a second capacitor 46 and a second resistor 47 that are sequentially connected in series.

Both ends of the first resistor 45 are connected to the first high-side and low-side normal mode output terminals 22NH and 22NL.
The termination resistor changeover switch 48 and the switching termination resistor 49 are connected in series between the first high-side and low-side normal mode output terminals 22NH and 22NL, for example.

The electronic measuring instrument 42 includes a measuring instrument that quantifies the magnitude (level, etc.) of noise including time fluctuations, such as a vector signal analyzer, a spectrum analyzer, and an oscilloscope. The voltage of noise (for example, high-side normal mode noise) output from the normal mode output terminals 22NH and 22NL is measured.
The electronic measuring instrument 42 includes, for example, a termination resistor 42R that connects the first high-side and low-side normal mode output terminals 22NH and 22NL.

  For example, when the termination resistance changeover switch 48 is in an open state, the electronic measuring instrument 42 has a first termination resistance value (for example, 50Ω) corresponding to the resistance value (for example, 50Ω) of the termination resistor 42R. Measure noise. On the other hand, in the closed state of the termination resistor changeover switch 48, the combination of the resistance value of the switching termination resistor 49 (for example, 50Ω, which is the same as the resistance value of the termination resistor 42R) and the resistance value (for example, 50Ω, etc.) of the termination resistor 42R. The normal mode noise on the high side is measured with a second termination resistance value (for example, 25Ω or the like) according to the above.

For example, the electronic measuring instrument 42 changes the measurement result according to the change in the termination resistance value when the termination resistance changeover switch 48 is switched between open and closed, similarly to the measurement of the common mode noise by the electronic measuring instrument 32. Based on the above, the internal impedance of high-side normal mode noise in the single electric / electronic component 2 is estimated.
Then, based on the estimation result of the internal impedance, the output voltage of high-side normal mode noise in the single electric / electronic component 2 is estimated.

The electronic measuring instrument 42 is, for example, for the normal mode noise on the high side of the appropriate output voltage V (x) having the appropriate internal impedance Im (x) in the single electric / electronic component 2, for example, the above formula (1) As shown in FIG. 5, V (50Ω) and V (V) which are measurement results of the high-side normal mode noise voltage at the first termination resistance value (for example, 50Ω) and the second termination resistance value (for example, 25Ω). 25Ω).
The electronic measuring instrument 42, for example, based on the change amount ΔV due to the change in the measurement result of the high-side normal mode noise voltage between V (50Ω) and V (25Ω), for example, according to the above equation (2). As shown, the internal impedance Im (25Ω → 50Ω) of high-side normal mode noise in the single electric / electronic component 2 is estimated.
Then, the electronic measuring instrument 42, for example, as shown in the above formula (3), the high-side normal mode noise internal impedance Im (25Ω → 50Ω) and the first termination resistance value (for example, 50Ω) are high. The output voltage P (50Ω) of the normal mode noise on the high side is estimated based on the measurement result of the voltage of the normal mode noise on the side (for example, V (50Ω) or the like).

The second normal mode noise detection unit 23 includes, for example, a pseudo power supply circuit network 51 and an electronic measuring instrument 52.
The pseudo power supply network (NormalLISN) 51 includes, for example, a line impedance stabilization network (LISN) and the like, and is connected to the low-side normal mode output terminal 21NL of the common-mode noise detection unit 21. A normal mode input terminal 22L, a low-side power supply terminal 23PL connected to the negative electrode of the power supply 24, and second high-side and low-side normal mode output terminals 23NH and 23NL are provided.

  The pseudo power supply network 51 includes, for example, a winding 53, a first capacitor 54 and a first resistor 55, a second capacitor 56 and a second resistor 57, a termination resistor changeover switch 58, and a switching termination resistor 59. I have.

For example, the winding 53 is inserted into a connection line 23LL that connects the low-side normal mode input terminal 23L and the low-side power supply terminal 22PL.
The low-side normal mode input terminal 23L is connected to the ground point via, for example, a first capacitor 54 and a first resistor 55 that are sequentially connected in series.
The low-side power supply terminal 22PL is connected to the ground point via, for example, a second capacitor 56 and a second resistor 57 that are sequentially connected in series.

Both ends of the first resistor 55 are connected to the second high-side and low-side normal mode output terminals 23NH and 23NL.
The termination resistor changeover switch 58 and the switching termination resistor 59 are connected in series between, for example, the second high side and low side normal mode output terminals 23NH and 23NL.

The electronic measuring instrument 52 includes a measuring instrument that quantifies the noise magnitude (level, etc.) including the time variation, such as a vector signal analyzer, a spectrum analyzer, and an oscilloscope. The voltage of noise (for example, low-side normal mode noise) output from the normal mode output terminals 23NH and 23NL is measured.
The electronic measuring instrument 52 includes, for example, a termination resistor 52R that connects between the second high-side and low-side normal mode output terminals 23NH and 23NL.

  For example, when the termination resistance changeover switch 58 is in an open state, the electronic measuring instrument 52 has a first termination resistance value (for example, 50Ω) corresponding to the resistance value (for example, 50Ω) of the termination resistor 52R and the low-side normal mode. Measure noise. On the other hand, in the closed state of the termination resistance changeover switch 58, the combination of the resistance value of the switching termination resistor 59 (for example, 50Ω which is the same as the resistance value of the termination resistor 52R) and the resistance value of the termination resistor 52R (for example, 50Ω). The low-side normal mode noise is measured with a second termination resistance value (for example, 25Ω) according to the above.

The electronic measuring instrument 52 measures, for example, in accordance with the change in the termination resistance value when the termination resistance changeover switch 58 is switched between open and closed, similarly to the measurement of the high-side normal mode noise by the electronic measuring instrument 42. Based on the change in the result, the internal impedance of the low-side normal mode noise in the single electric / electronic component 2 is estimated.
Based on the estimation result of the internal impedance, the low-side normal mode noise output voltage in the single electric / electronic component 2 is estimated.

The electronic measuring instrument 52 is, for example, for the normal mode noise on the low side of the appropriate output voltage V (x) having the appropriate internal impedance Im (x) in the single electric / electronic component 2, for example, the above formula (1) As shown in FIG. 5, V (50Ω) and V (V) are the measurement results of the low-side normal mode noise voltage at the first termination resistance value (for example, 50Ω) and the second termination resistance value (for example, 25Ω). 25Ω).
The electronic measuring instrument 52, for example, based on the change amount ΔV due to the change in the measurement result of the low-side normal mode noise voltage between V (50Ω) and V (25Ω), for example, according to the above formula (2). As shown, the internal impedance Im (25Ω → 50Ω) of the low-side normal mode noise in the single electric / electronic component 2 is estimated.
Then, the electronic measuring instrument 52 has a low-side normal mode noise internal impedance Im (25Ω → 50Ω) and a first termination resistance value (for example, 50Ω, for example) as shown in the above formula (3). The low-side normal mode noise output voltage P (50Ω) is estimated based on the measurement result of the normal-mode noise voltage (for example, V (50Ω)).

The propagation characteristic acquisition unit 11, for example, has the internal impedance of the common mode noise estimated by the electromagnetic interference measuring device 10, the impedance attached to the source of the common mode noise, and the impedance of the normal mode noise on the high side and the low side. As a result, the series impedance ImCd of common mode noise is calculated.
The propagation characteristic acquisition unit 11 includes, for example, the internal impedance of the common mode noise estimated by the electromagnetic interference measurement device 10 (that is, the common mode total impedance ImCT) and the electromagnetic interference measurement device, as shown in the following formula (4). Based on the internal impedances of the high-side and low-side normal mode noises estimated by 10 (that is, the series impedances ImNH and ImNL of the high-side and low-side normal mode noises), the series impedance ImCd of the common mode noise is calculated. .

  For example, the propagation characteristic acquisition unit 11 multiplies each of the output voltage of the common mode noise estimated by the electromagnetic interference wave measuring apparatus 10 and the output voltage of the normal mode noise on the high side and the low side by a magnification of a predetermined noise level. Then, the common mode noise output voltage VC and the high side and low side normal mode noise output voltages VH and VL are calculated.

The propagation characteristic acquisition unit 11 includes, for example, the common mode noise output voltage VC, the high and low side normal mode noise output voltages VH and VL, the common mode noise series impedance ImCd, the high side and low side Based on the series impedance ImNH and ImNL of normal mode noise, the single electric / electronic component 2 is modeled as a signal source as shown in FIG. 4, for example.
Accordingly, the flow paths IC and IN of the currents of the common mode noise and the normal mode noise in the modeled electrical / electronic component 2 and electromagnetic interference wave measuring apparatus 10 are expressed as shown in FIG. 5, for example.

And the propagation characteristic acquisition part 11 acquires the propagation characteristic of the electromagnetic interference wave from the exit of the electrical / electronic component 2 to the vehicle-mounted receiver 3 based on the modeled electrical / electronic component 2, for example.
For example, the propagation characteristic acquisition unit 11 performs the measurement of the electric / electronic component 2 by a predetermined electromagnetic field simulation, by actual measurement by a network analyzer or the like, or by multiplying the electromagnetic field simulation and the actual measurement of the propagation characteristic of the passive component. The propagation characteristic of the electromagnetic interference wave from the exit to the in-vehicle receiver 3 is acquired.

  For example, as illustrated in FIG. 6, the propagation characteristic acquisition unit 11 is configured for an electrical / electronic component 2, a harness or component directly connected to the electrical / electronic component 2, and a harness directly connected to the electrical / electronic component 2. A predetermined electromagnetic field simulation is executed on a system A including a harness in which crosstalk occurs and the like based on, for example, a harness routing form and a component shape that are known in advance. Further, for example, measurement is performed by a network analyzer or the like for the system B including a harness or a component that affects the vehicle-mounted receiver 3 including the antenna 3a, the amplifier 3b, the feeder line 3c, and the like mounted on the vehicle. And based on each result of electromagnetic field simulation and actual measurement, the propagation characteristic of the electromagnetic interference wave from the exit of the electric and electronic component 2 to the feeder line 3c is acquired.

  For example, the RF signal prediction unit 12 uses the electromagnetic characteristics acquired from the propagation characteristic acquisition unit 11 based on the estimation results of the common mode noise estimated by the electromagnetic interference wave measuring apparatus 10 and the high-side and low-side normal mode noise. After multiplying the propagation characteristics of the interference wave, addition is performed as an RF signal.

The signal generator 13 includes, for example, a vector signal generator, and generates an electromagnetic interference wave having time variation information according to the RF signal predicted by the RF signal prediction unit 12.
For example, the signal generator 13 adds the generated electromagnetic interference wave to a measurement reference signal (for example, a radio carrier wave) to test the influence on the in-vehicle receiver 3.

  The electromagnetic interference wave evaluation system 1 and the electromagnetic interference wave measurement apparatus 10 according to the present embodiment have the above-described configuration. Next, operations of the electromagnetic interference wave evaluation system 1 and the electromagnetic interference wave measurement apparatus 10 will be described.

First, for example, in step S01 shown in FIG. 7, each internal impedance and each output voltage of common mode noise and normal mode noise are measured by the electromagnetic interference wave measuring apparatus 10.
Next, in step S02, the propagation characteristic acquisition unit 11 acquires the propagation characteristic of the electromagnetic interference wave from the outlet of the electric / electronic component 2 to the in-vehicle receiver 3.
Next, in step S03, the RF signal prediction unit 12 predicts the RF signal.
Next, in step S04, the signal generator 13 generates an electromagnetic interference wave.
Next, in step S05, the influence of the generated electromagnetic interference wave on the in-vehicle receiver 3 is evaluated, and the process proceeds to the end.

Details of the processing in step S01 described above will be described below.
First, in step S11 shown in FIG. 8, for example, the single electric / electronic component 2 is grounded by being connected to a ground plane (not shown).
At this time, for example, capacitive coupling components and resistance components of various components (for example, a battery, a motor, a sensor, and the like) arranged outside the electrical / electronic component 2 are included in the internal impedance of the common mode noise of the electrical / electronic component 2. To ground.

  Next, in step S12, the common mode noise detection unit 21 is connected in series to the electrical / electronic component 2 with a first termination resistance value (for example, 50Ω), and the first normal mode noise detection unit 22 and the second normal mode noise detection unit 22 are connected. The mode noise detection unit 23 is connected in series to the common mode noise detection unit 21 with a first termination resistance value (for example, 50Ω).

  Next, in step S13, the common mode noise voltage is measured by the common mode noise detection unit 21, and the high and low normal modes are measured by the first normal mode noise detection unit 22 and the second normal mode noise detection unit 23. Measure the noise voltage.

  Next, in step S14, the common mode noise detection unit 21 is connected in series to the electrical / electronic component 2 with a second termination resistance value (for example, 25Ω), and the first normal mode noise detection unit 22 and the second normal mode noise detection unit 22 are connected. The mode noise detector 23 is connected in series to the common mode noise detector 21 with a second termination resistance value (for example, 25Ω).

  Next, in step S15, the common mode noise voltage is measured by the common mode noise detection unit 21, and the high and low normal modes are detected by the first normal mode noise detection unit 22 and the second normal mode noise detection unit 23. Measure the noise voltage.

Next, in step S16, the internal impedance and output voltage of the common mode noise are estimated based on the amount of change in the measurement result of the voltage of the common mode noise that accompanies switching between the first termination resistance value and the second termination resistance value. To do.
Then, based on the amount of change in the measurement result of the voltage of the normal mode noise on the high side and the low side that accompanies switching between the first termination resistance value and the second termination resistance value, the inside of the normal mode noise on the high side and the low side Estimate impedance and output voltage and proceed to return.

As described above, according to the electromagnetic interference wave measuring apparatus 10 according to the present embodiment, the measurement of the conductive interference wave generated from the single electric / electronic component 2 is performed separately into the common mode noise and the normal mode noise. Can do. Accordingly, the internal impedance of common mode noise and normal mode noise and the noise level (for example, output voltage) of the noise source can be estimated.
Further, as countermeasures and countermeasures for the electric / electronic component 2 for reducing the common mode noise and the normal mode noise, it is possible to select different countermeasures and countermeasures for the common mode noise and the normal mode noise.

Further, common mode noise and normal mode noise are separated in the common mode noise detection unit 21 in the previous stage connected in series to the single electric / electronic component 2, and the first in the subsequent stage connected in series to the common mode noise detection unit 21. The normal mode noise is measured by the normal mode noise detector 22 and the second normal mode noise detector 23.
Thereby, for example, the apparatus configuration can be simplified as compared with the case where the first normal mode noise detection unit 22 and the second normal mode noise detection unit 23 are also configured to separate common mode noise and normal mode noise. .

Further, in the common mode noise detection unit 21, normal mode noise is attenuated by the second common mode choke coil 34 and the third common mode choke coil 35, and the voltage across the resistor 37L is increased by the third common mode choke coil 35. And low side common mode output terminals 21CH and 21CL.
As a result, it is possible to accurately stabilize the impedance of only the common mode noise with the termination resistance value serving as a desired reference.

  Moreover, according to the electromagnetic interference evaluation system 1 according to the present embodiment, the on-vehicle receiver is based on the internal impedance of the common mode noise and normal mode noise estimated by the electromagnetic interference measurement device 10 and the noise level of the noise source. 3 can be accurately predicted.

  Furthermore, the propagation characteristics of the electromagnetic interference wave from the outlet of the electrical / electronic component 2 to the in-vehicle receiver 3 can be obtained by electromagnetic field simulation, and only one measurement by the electromagnetic interference wave measuring device 10 for the single electrical / electronic component 2 is possible. Thus, it is possible to accurately predict the influence of electromagnetic interference waves on a plurality of different patterns (for example, other vehicles with different harness routing forms, bodies, etc.).

  Thereby, since the measurement is completed only by the measurement of the conducted emission, the time required for the measurement of the radiated emission, an expensive anechoic chamber, etc. are not required, and the occurrence of an error accompanying the measurement of the radiated emission can be prevented.

  Further, the propagation characteristics of the electromagnetic interference acquired by the propagation characteristics acquisition unit 11 are multiplied by the estimation results of the common mode noise estimated by the electromagnetic interference measurement apparatus 10 and the normal mode noise on the high side and the low side. By combining, it is possible to easily and accurately obtain a result equivalent to the test result in an actual vehicle with respect to the influence of the electromagnetic interference wave on the in-vehicle receiver 3.

  In the above-described embodiment, the common mode noise detection unit 21, the first normal mode noise detection unit 22, and the second normal mode noise detection unit 23 set the termination resistance value to the first termination resistance value (for example, , 50Ω, etc.) and a second termination resistance value (for example, 25Ω, etc.), but it is not limited to this, and for example, it may be changeable to three or more different resistance values.

  In the embodiment described above, for example, an appropriate limit value may be provided for common mode noise and normal mode noise, and the component under measurement may be managed with respect to this limit value.

  In the above-described embodiment, for example, addition of data acquired by a vector signal analyzer, addition with a measurement reference signal, and the like are performed by hardware (for example, an analog method using a power divider or the like). Not only the addition of signals but also addition as digital data on a computer may be included.

In the above-described embodiment, for example, when common mode noise and normal mode noise of the electrical / electronic component 2 are performed by the number of signals to be measured, the addition of these signals is performed by hardware or digital data. May be performed.
In the above-described embodiment, for example, when the normal mode noise is significantly lower than the common mode noise, when the noise is low on the signal line to be measured, or when there is a place where measurement is not performed, etc. In order to simplify the reproduction of the electromagnetic interference wave by the signal generator 13, the propagation characteristics are multiplied only by the common mode noise, and the normal mode noise may not be added.

Further, in the above-described embodiment, for example, it is possible to perform an influence test to determine how much the noise level of the single electric / electronic component 2 is attenuated to allow the influence of the in-vehicle receiver 3. A requirement for propagation characteristics corresponding to the quantity can be set.
Along with this, the requirement value of the propagation characteristics may be allocated to the actual measurement value and the predicted value of the electromagnetic field simulation, each of the actual measurement value and the predicted value of the electromagnetic field simulation for a system including a passive component or a harness, or The requirement value may be set individually independently or only in any one of them.
For example, the requirement value may be set assuming that the propagation characteristic changes depending on the frequency.

(First modification)
In the above-described embodiment, for example, when three or more signal lines are connected to the electric / electronic component 2, or a pair of high-side and low-side signals that are connected to the electric / electronic component 2. In the case where conductive interference waves (conductive emissions) are measured for a plurality of pairs of lines, the common mode noise detection unit 21 corresponding to three or more multi-lines may be employed.

For example, the common mode noise detection unit 21 corresponding to N signal lines with an integer N of 3 or more includes a noise separation unit 61 and an electronic measuring instrument 32, and the noise separation unit 61 includes N windings. N-phase first common mode choke coil 63 and third common mode choke coil 65 having lines and the number of combinations when a pair of signal lines are extracted from N signal lines without overlap (= _N C ₂ ) And a second common mode choke coil 64 having the same number of single-phase common mode choke coils (that is, a common mode choke coil having a pair of windings).

For example, the common mode noise detection unit 21 according to the first modification of the above-described embodiment shown in FIG. 9 corresponds to a three-phase line connected to the electrical / electronic component 2, and includes a noise separation unit 61 and an electronic measuring instrument 32. And.
The noise separating unit 61 includes, for example, three first to third common mode choke coils 63, 64, 65, three pairs of capacitors 66W, 66V and 67V, 67U and 68W, 68U, and three resistors 69U, 69V, 69 W, a termination resistor changeover switch 38, and a switching termination resistor 39.

The first common mode choke coil 63 includes, for example, three windings 63U, 63V, 63W wound in the same direction by bifilar winding or the like, and a core 63C.
For example, the three windings 63U, 63V, and 63W that are electromagnetically coupled via the core 63C do not exhibit inductance with respect to normal mode noise, and the inductance with respect to common mode noise is larger than the inductance with respect to normal mode noise. It is wound like so.
Winding 63U is inserted into connection line 21U connecting U-phase input terminal 21U and U-phase normal mode output terminal 21NU, and winding 63V connects V-phase input terminal 21V and V-phase normal mode output terminal 21NV. The winding 63W is inserted in the connection line 21W that connects the W-phase input terminal 21W and the W-phase normal mode output terminal 21NW.

  For example, the first common mode choke coil 63 attenuates common mode noise by generating mutual inductance between the connection lines 21U, 21V, and 21W, and allows normal mode noise to pass through without being attenuated.

  The windings 63U, 63V, and 63W are configured by, for example, coaxial cables, and suppress the attenuation of normal mode noise while maintaining the attenuation of common mode noise. Further, the windings 63U, 63V, and 63W can further suppress the attenuation of the normal mode noise, for example, by impedance matching the terminal end of the coaxial cable.

The second common mode choke coil 64 includes, for example, three (that is, ₃ C ₂ pieces) single-phase common mode choke coils 64UV, 64VW, and 64WU.
The common mode choke coils 64UV, 64VW, and 64WU are, for example, the same and include a pair of windings 64A and 64B and a core 64C.
For example, the pair of windings 64A and 64B electromagnetically coupled via the core 64C does not exhibit inductance with respect to common mode noise so that the inductance with respect to normal mode noise becomes larger than the inductance with respect to common mode noise. It is wound around.

The third common mode choke coil 65 includes, for example, three windings 65U, 65V, 65W wound in the same direction by bifilar winding or the like, and a core 65C.
For example, the three windings 65U, 65V, and 65W that are electromagnetically coupled via the core 65C do not exhibit inductance with respect to normal mode noise, and the inductance with respect to common mode noise becomes larger than the inductance with respect to normal mode noise. It is wound like so.
The windings 65U, 65V, and 65W are configured by, for example, coaxial cables, and suppress the attenuation of normal mode noise while maintaining the attenuation of common mode noise. Furthermore, the windings 65U, 65V, and 65W can further suppress the attenuation of normal mode noise, for example, by impedance matching the end of the coaxial cable.

  Capacitor 66W and winding 64A of common mode choke coil 64VW sequentially connected in series in connection line 21W1 branched from connection line 21W, and capacitor 68W and common connected in series in connection line 21W2 branched from connection line 21W The winding 64A of the mode choke coil 64WU is connected in parallel between the connection line 21W and the grounded winding 65W of the third common mode choke coil 65.

  The capacitor 66V and the winding 64B of the common mode choke coil 64VW sequentially connected in series in the connection line 21V1 branched from the connection line 21V, and the capacitor 67V and common connected in series in the connection line 21V2 branched from the connection line 21V. The winding 64A of the mode choke coil 64UV is connected in parallel between the connection line 21V and the grounded winding 65V of the third common mode choke coil 65.

  Capacitor 67U and winding 64B of common mode choke coil 64UV sequentially connected in series at connection line 21U1 branched from connection line 21U, and capacitor 68U and common connected in series at connection line 21U2 branched from connection line 21U The winding 64B of the mode choke coil 64WU is connected in parallel between the connection line 21U and the grounded winding 65U of the third common mode choke coil 65.

The pair of windings 64A and 64B of the common mode choke coils 64UV, 64VW, and 64WU of the second common mode choke coil 64 are wound so that, for example, opposite phase voltages are generated.
Each common mode choke coil 64UV, 64VW, 64WU of the second common mode choke coil 34 attenuates normal mode noise by generating a mutual inductance between a pair of windings 64A, 64B, for example, and common mode noise. Is allowed to pass through without being attenuated.

  The common mode choke coils 64UV, 64VW, and 64WU of the second common mode choke coil 64 are connected in reverse to the connection of the normal common mode choke coil, for example, the second common mode choke coil 34 shown in FIG. Alternatively, a configuration in which an intermediate point of a winding of a normal common mode choke coil is drawn out may be employed.

Both ends of the winding 65U of the third common mode choke coil 65 are connected to the high side and low side common mode output terminals 21CH and 21CL.
For example, the resistor 69U is connected between both ends of the winding 65U of the third common mode choke coil 65, and the resistor 69V is connected between both ends of the winding 65V of the third common mode choke coil 65, for example. Is connected between both ends of the winding 65W of the third common mode choke coil 65, for example.

For example, the third common mode choke coil 65 causes normal mode noise to pass to the ground point (ground short circuit) by generating mutual inductance between the windings 65U, 65V, and 65W.
For example, the third common mode choke coil 65 and the resistors 69U, 69V, and 69W are configured such that a voltage across the resistors 69V and 69W due to common mode noise is applied between the high side and low side common mode output terminals 21CH and 21CL by a transformer function. Induce.

(Second modification)
In the above-described embodiment, a normal mode noise detection unit 70 capable of extracting only normal mode noise may be employed instead of the first and second normal mode noise detection units 22 and 23.
For example, the normal mode noise detection unit 70 according to the second modification of the above-described embodiment illustrated in FIG. 10 includes a noise separation unit 71 and an electronic measuring instrument 72.

  The noise separation unit 71 includes, for example, a line impedance stabilization network (LISN), and is connected to the high-side and low-side normal mode output terminals 21NH and 21NL of the common mode noise detection unit 21. Side and low side normal mode input terminals 71H and 71L, high side and low side terminals 71P and 71N connected to a power source (not shown), and high side and low side normal mode output terminals 71NH and 71NL ing.

  The noise separating unit 71 includes, for example, a normal mode noise blocking unit 73, two first and second common mode choke coils 74 and 75, a pair of capacitors 76H and 76L, and a pair of resistors 77H and 77L. A termination resistor changeover switch 78 and a switching termination resistor 79 are provided.

The normal mode noise blocker 73 includes, for example, a pair of windings 73H and 73L.
The winding 73H is inserted into a connection line 71CA that connects the high-side input terminal 71H and the high-side terminal 71P, and the winding 73L is inserted into a connection line 71CB that connects the low-side input terminal 71L and the low-side terminal 71N. Has been.

  The normal mode noise blocking unit 73 blocks normal mode noise from passing through the pair of windings 73H and 73L, for example, and distributes the normal mode noise to the first common mode choke coil 74.

The first common mode choke coil 74 includes, for example, a pair of windings 74H and 74L and a core 74C.
For example, the pair of windings 74H and 74L that are electromagnetically coupled via the core 74C do not exhibit inductance with respect to normal mode noise so that the inductance with respect to common mode noise is larger than the inductance with respect to normal mode noise. It is wound around.

The second common mode choke coil 75 includes, for example, a pair of windings 75H and 75L and a core 75C.
For example, the pair of windings 75H and 75L that are electromagnetically coupled via the core 75C does not exhibit an inductance with respect to the common mode noise so that the inductance with respect to the normal mode noise becomes larger than the inductance with respect to the common mode noise. It is wound around.

  The capacitor 76H, the winding 74H, and the winding 75H are, for example, sequentially connected in series and inserted into the normal mode connection line 71NA that connects the high-side input terminal 71H and the ground point. 74L and winding 75L are connected in series, for example, and inserted into normal mode connection line 71NB that connects low-side input terminal 71L and the ground point, for example.

  For example, the first common mode choke coil 74 attenuates the common mode noise by generating a mutual inductance between the normal mode connection lines 71NA and 71NB, and allows the normal mode noise to pass through without being attenuated.

The pair of windings 75H and 75L of the second common mode choke coil 75 are wound so that, for example, opposite phase voltages are generated.
The windings 75H and 75L are constituted by, for example, coaxial cables, exhibit high impedance with respect to normal mode noise, and function as a transformer.

  The second common mode choke coil 75 may be connected in reverse to the connection of the normal common mode choke coil, for example, as in the second common mode choke coil 34 shown in FIG. A configuration in which an intermediate point of the winding of the choke coil is drawn out may be employed.

Both ends of the winding 75H of the second common mode choke coil 75 are connected to the high-side and low-side normal mode output terminals 71NH and 71NL.
The resistor 77H is connected between both ends of the winding 75H of the third common mode choke coil 75, for example, and the resistor 77L is connected between both ends of the winding 75L of the third common mode choke coil 75, for example.

The second common mode choke coil 75 causes the common mode noise to pass to the ground point (ground short circuit) by, for example, generating a mutual inductance between the normal mode connection lines 71NA and 71NB.
The second common mode choke coil 75 and the pair of resistors 77H and 77L induce, for example, a voltage across the resistor 77L due to normal mode noise between the high side and low side normal mode output terminals 71NH and 71NL by a transformer function. To do.

  The termination resistor changeover switch 78 and the switching termination resistor 79 are connected in series between the high-side and low-side normal mode output terminals 71NH and 71NL, for example.

The electronic measuring instrument 72 includes, for example, a measuring instrument that quantifies the noise magnitude (level, etc.) including the time fluctuation, such as a vector signal analyzer, a spectrum analyzer, and an oscilloscope. The voltage of normal mode noise output from the output terminals 71NH and 71NL is measured.
The electronic measuring instrument 72 includes, for example, a termination resistor 72R that connects between the high-side and low-side normal mode output terminals 71NH and 71NL.

  For example, when the termination resistance changeover switch 78 is opened, the electronic measuring instrument 72 measures the normal mode noise with the first termination resistance value (for example, 50Ω) according to the resistance value (for example, 50Ω) of the termination resistance 72R. To do. On the other hand, in the closed state of the termination resistor changeover switch 78, the combination of the resistance value of the switching termination resistor 79 (for example, 50Ω that is the same as the resistance value of the termination resistor 72R) and the resistance value of the termination resistor 72R (for example, 50Ω). Normal mode noise is measured with a second termination resistance value (for example, 25Ω, etc.) according to the above.

For example, the electronic measuring instrument 72 changes the measurement result according to the change in the terminal resistance value when the terminal resistance changeover switch 78 is switched between open and closed in the same manner as the measurement of the common mode noise by the electronic measuring instrument 32. Based on the above, the internal impedance of normal mode noise in the single electric / electronic component 2 is estimated.
Based on the estimation result of the internal impedance, the output voltage of normal mode noise in the single electric / electronic component 2 is estimated.

The electronic measuring instrument 72 is, for example, as shown in the above formula (1) for normal mode noise of an appropriate output voltage V (x) having an appropriate internal impedance Im (x) in the single electric / electronic component 2. In addition, V (50Ω) and V (25Ω), which are measurement results of the voltage of the normal mode noise at the first termination resistance value (for example, 50Ω) and the second termination resistance value (for example, 25Ω), are obtained.
Then, the electronic measuring instrument 72 is, for example, as shown in the above formula (2) based on the change amount ΔV due to the change in the measurement result of the normal mode noise voltage between V (50Ω) and V (25Ω). The internal impedance Im (25Ω → 50Ω) of normal mode noise in the single electric / electronic component 2 is estimated.
Then, the electronic measuring instrument 72 has a normal mode noise internal impedance Im (25Ω → 50Ω) and a normal termination noise value (for example, 50Ω, for example) as shown in the above formula (3). Based on the voltage measurement result (for example, V (50Ω) or the like), the normal mode noise output voltage P (50Ω) is estimated.

  According to this second modification, the separation ratio between common mode noise and normal mode noise can be improved.

(Third Modification)
In the second modification of the above-described embodiment, the normal mode noise blocker 73 includes a pair of windings 73H, such as the normal mode noise detector 70 according to the third modification shown in FIG. , 73L may be provided with a common mode choke coil 73a.
The common mode choke coil 73a includes, for example, a pair of windings 73aH and 73aL and a core 73C.
The pair of windings 73aH and 73aL that are electromagnetically coupled via the core 73C, for example, exhibit a large inductance with respect to the normal mode noise so as to block the passage of the normal mode noise so that the normal mode noise is the first common. The mode choke coil 74 is distributed.
The pair of windings 73aH and 73aL are wound so that, for example, opposite phase voltages are generated.

  The common mode choke coil 73a may be connected in reverse to the connection of the normal common mode choke coil, for example, as in the second common mode choke coil 34 shown in FIG. It is good also as a structure which pulled out the intermediate point of the coil | winding of a coil.

According to this 3rd modification, a physique can be made small compared with a 2nd modification.
However, in the normal mode noise detection unit 70 according to the third modification, when a power source or the like is connected between the high-side terminal 71P and the low-side terminal 71N, magnetic saturation is likely to occur compared to the second modification. Therefore, it is preferable that the present invention is applied to a signal line through which a smaller current flows than in the second modification.

(Fourth modification)
In the above-described embodiment, for example, the load is symmetric with respect to the third common mode choke coil 65 as in the common mode noise detection unit 21 according to the fourth modification of the above embodiment shown in FIG. You may comprise.
The noise separation unit 31 of the common mode noise detection unit 21 according to the fourth modification includes, for example, three first to third common mode choke coils 33, 34, and 35, a pair of capacitors 36H and 36L, A pair of resistors 37H and 37L, a terminating resistor selector switch 38, a switching terminating resistor 39, a first resistor 81, a second resistor 82, a selector switch 83, a selector resistor 84, a correction capacitor 85, a line And an intermediate capacitor 86.

  That is, the noise separation unit 31 of the common mode noise detection unit 21 according to the fourth modification example has the first resistor 81 and the second resistance compared to the noise separation unit 31 of the common mode noise detection unit 21 of the above-described embodiment. A resistor 82, a changeover switch 83, a changeover resistor 84, a correcting capacitor 85, and a line-to-line capacitor 86 are added.

  The first resistor 81 has, for example, the same resistance value as that of the termination resistor 32R (for example, 50Ω) of the electronic measuring instrument 32, and an electron between both ends of the winding 35H of the third common mode choke coil 35. The measuring instrument 32 is connected in series to the terminating resistor 32R.

  The second resistor 82 has, for example, the same resistance value as the combined resistance value (for example, 100Ω) of the terminal resistor 32R and the first resistor 81 of the electronic measuring instrument 32 connected in series, and the third common mode choke The coil 35 is connected between both ends of the winding 35L.

  The changeover switch 83 and the changeover resistor 84 are connected in series between both ends of the winding 35L of the third common mode choke coil 35, for example, and the changeover resistor 84 is a resistance value (for example, 100Ω) of the changeover termination resistor 39. Have the same resistance value.

The correction capacitor 85 is connected between both ends of the first resistor 81, for example.
The line capacitor 86 is disposed between the common mode connection lines 21CA and 21CB between the second common mode choke coil 34 and the third common mode choke coil 35, for example.

  According to the fourth modification, the load is symmetrically configured with respect to the third common mode choke coil 65, whereby a uniform frequency characteristic can be obtained over a wide band. For example, in a vehicle, a radio reception frequency band The noise transmitted as an electromagnetic interference wave from the vehicle can be measured well.

  In addition, by providing the correcting capacitor 85, for example, a decrease in signal level caused by connecting the first resistor 81 in series with the termination resistor 32R of the electronic measuring instrument 32 (that is, a common input to the electronic measuring instrument 32). A decrease in the level of mode noise), a decrease in the signal level in the high frequency region due to the parasitic inductance existing in the line impedance stabilization network (that is, a decrease in the level of common mode noise that can be captured by the electronic measuring instrument 32), etc. Can be compensated.

  Also, by providing the line capacitor 86, normal mode noise can be cut off in a wide frequency band, and only common mode noise can be measured well.

(5th modification)
In the fourth modification of the above-described embodiment, for example, between both ends of the winding 35L of the third common mode choke coil 35 as in the common mode noise detection unit 21 according to the fourth modification shown in FIG. , An inductance 87 connected in series to the switching resistor 84 may be provided.
According to the fifth modification, the frequency characteristics can be further improved in a wide frequency band.

  It should be noted that the technical scope of the present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the configuration of the above-described embodiment is merely an example, and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Electromagnetic interference evaluation system 2 Electric and electronic component 3 In-vehicle receiver 10 Electromagnetic interference measuring device 11 Propagation characteristic acquisition part (propagation characteristic acquisition means)
12 RF signal prediction unit (signal generating means)
13 Signal generator (signal generation means)
21 Common mode noise detector (common mode noise detector)
22 1st normal mode noise detection part (normal mode noise detection means, 1st detection means)
23 Second normal mode noise detection unit (normal mode noise detection means, second detection means)
31 Noise separation part (separation means)
32 Electronic measuring instrument (Common mode noise estimation means)
32R Termination resistor (load)
33 First common mode choke coil (first damping means)
33H, 33L Winding 34 Second common mode choke coil (second damping means, common mode choke coil)
35 Third common mode choke coil (voltage induction means)
35H, 35L Winding 37H, 37L Resistance (resistance, load)
39 Switching termination resistance (load)
42 Electronic measuring instrument (Normal mode noise estimation means)
52 Electronic measuring instrument (Normal mode noise estimation means)
61 Noise separation part (separation means)
63 1st common mode choke coil (1st damping means)
63U, 63V, 63W Winding 64 Second common mode choke coil (second damping means)
64UV, 64VW, 64WU common mode choke coil
64A, 64B Winding 65 Third common mode choke coil (voltage induction means)
65U, 65V, 65W Winding 69U, 69V, 69W Resistor 70 Normal mode noise detection unit (normal mode noise detection means)
71 Noise separator (extraction means)
72 Electronic measuring instrument (Normal mode noise estimation means)
73 Normal mode noise block (blocking means)
74 First common mode choke coil (common mode noise attenuation means)
75 Second common mode choke coil (normal mode noise voltage induction means)
81 1st resistance (load)
82 2nd resistance (load)

Claims (7)

A single electrical and electronic component connected in series sequentially, common mode noise detection means, and normal mode noise detection means,
The common mode noise detection means includes
Separation means for separating common mode noise and normal mode noise;
The magnitude of the common mode noise is measured with a plurality of different termination resistance values, and based on the amount of change in the measurement result according to the change in the termination resistance value, the internal impedance of the common mode noise in the electrical and electronic components and A common mode noise estimating means for estimating the magnitude,
The normal mode noise detection means includes
Measure the magnitude of the normal mode noise with a plurality of different termination resistance values, and based on the amount of change in the measurement result according to the change in the termination resistance value, the internal impedance of the normal mode noise in the electrical and electronic components and Normal mode noise estimation means for estimating the magnitude;
An electromagnetic interference wave measuring device comprising: The separating means includes
First attenuation means for attenuating the common mode noise;
Second attenuation means for attenuating the normal mode noise;
A voltage inducing means for inducing a voltage of the common mode noise in the common mode noise estimating means, and shorting the normal mode noise to ground;
The electromagnetic interference wave measuring apparatus according to claim 1, further comprising: Each of the first attenuating means and the voltage inducing means comprises one N-phase common mode choke coil having N windings with an integer N equal to or greater than 2.
The second attenuating means includes _N C _two single-phase common mode choke coils having a pair of windings and a non-overlapping combination.
The electromagnetic interference wave measuring apparatus according to claim 2, wherein the voltage inducing unit includes a resistor connecting both ends of the winding.   The electromagnetic interference wave measuring apparatus according to claim 3, wherein the voltage inducing means includes a load that is symmetrical with respect to the N windings of the common mode choke coil. The normal mode noise detection means includes an extraction means for extracting the normal mode noise,
The extraction means includes
Blocking means for blocking the normal mode noise;
Common mode noise attenuation means for attenuating the common mode noise;
Normal mode noise voltage inducing means for inducing the normal mode noise voltage in the normal mode noise estimating means, and shorting the common mode noise to ground;
The electromagnetic interference wave measuring device according to any one of claims 1 to 4, further comprising: An electromagnetic interference measuring apparatus according to claim 1;
An in-vehicle receiver,
Propagation characteristic acquisition means for acquiring propagation characteristics of electromagnetic interference waves from the electric / electronic component to the vehicle-mounted receiver;
Based on the internal impedance and the magnitude of the common mode noise and the normal mode noise estimated by the electromagnetic interference measuring apparatus, and the propagation characteristic acquired by the propagation characteristic acquisition means, a pseudo electromagnetic interference wave And a signal generating means for inputting the pseudo electromagnetic interference wave to the in-vehicle receiver,
An electromagnetic interference wave evaluation system comprising: The propagation characteristic acquisition means is configured to connect the electric and electronic components to the internal impedance of the common mode noise connected in series and the internal impedance of the normal mode noise on the high side, and the common mode noise connected in series. Modeled as a signal source comprising the internal impedance and the internal impedance of the normal mode noise on the low side,
The normal mode noise detection means includes first detection means for detecting the normal mode noise on the high side, and second detection means for detecting the normal mode noise on the low side. Item 7. The electromagnetic interference evaluation system according to Item 6.

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