WO2014064807A1 - コモンモードノイズ低減装置 - Google Patents
コモンモードノイズ低減装置 Download PDFInfo
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- WO2014064807A1 WO2014064807A1 PCT/JP2012/077631 JP2012077631W WO2014064807A1 WO 2014064807 A1 WO2014064807 A1 WO 2014064807A1 JP 2012077631 W JP2012077631 W JP 2012077631W WO 2014064807 A1 WO2014064807 A1 WO 2014064807A1
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- common mode
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- impedance element
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- ground
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
Definitions
- the present invention relates to a common mode noise reduction device.
- Patent Document 1 in a power conversion device in which a load wiring for connecting an inverter and a motor is passed through a core, a grounding wire for grounding the housing of the motor is passed through the core and connected to a capacitor on the input side of the inverter. It is described. Thus, according to Patent Document 1, the resonance frequency of the resonance path in the inverter is lowered by the impedance of the core, and a damping effect is obtained for the resonance path.
- Patent Document 2 in a power conversion system in which a power line connecting an inverter and a motor is passed through a core of a PG coil, a common mode current return line is passed through the core of the PG coil as a path through which the common mode current flows back.
- the power line and the common mode current return line are arranged close to each other.
- Patent Document 3 in a filter of a power conversion system in which a filter is provided between a power conversion device and a load, a power line connecting the power conversion device and the load is simultaneously connected to the first magnetic core and the second magnetic core. It is described that a winding of one turn is performed, and a ground wire that connects the casing of the power converter and the casing of the load is wound around the second magnetic core. Further, it is described that the winding direction of the ground wire is such that the magnetic field due to the current of the power line and the magnetic field due to the current of the ground wire cancel each other. Thus, according to Patent Document 3, it is said that a large current flows through the filter and electric power having a large cross-sectional area can be wound in a single winding process, so that the manufacturing process can be reduced and the filter can be downsized.
- Patent Document 2 describes that a capacitor is inserted on the common mode current return line in order to suppress the DC voltage applied to the PG coil and prevent the characteristic deterioration of the PG coil. According to the technique described in Patent Document 2, since the impedance of the common mode current return line must be made sufficiently smaller than the impedance of the ground circuit, the impedance of the capacitor inserted on the common mode current return line is extremely high. It is considered to be small.
- a low-impedance resistor is connected in series to the ground line of the filter so as not to saturate the magnetic materials of the first magnetic core and the second magnetic core.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a common mode noise reduction device that can be operated safely and can suppress the noise influence on peripheral devices to an allowable level or less.
- a common mode noise reduction device includes a power converter that supplies power to a load, and a housing that houses the power converter.
- a common mode inductor disposed between the power converter and the load; a power wiring that passes through the common mode inductor and connects the power converter to the load; and a through of the common mode inductor;
- a second impedance element provided between a bus of the power converter on the ground wiring and the load is provided.
- the power wiring connects the power converter to the load while passing through the common mode inductor
- the ground wiring connects the load to the housing and the bus of the power converter while passing through the common mode inductor. .
- the first impedance element is provided between the housing and the load on the ground wiring
- the second impedance element is provided between the bus of the power converter and the load on the ground wiring. ing.
- the common mode current flowing back from the load side can be shunted to the housing side and the power converter bus side with an appropriate balance, so that the common mode voltage can be suppressed below the allowable upper limit value and the common mode noise can be reduced.
- the common mode current flowing out of the reduction device can be suppressed below the allowable upper limit level.
- FIG. 1 is a diagram illustrating a configuration of a common mode noise reduction apparatus according to the first embodiment.
- FIG. 2 is a diagram illustrating the characteristics of the common mode noise reduction apparatus according to the first embodiment.
- FIG. 3 is a diagram illustrating characteristics of the common mode noise reduction device according to the first exemplary embodiment.
- FIG. 4 is a diagram illustrating the operation of the common mode noise reduction apparatus according to the first embodiment.
- FIG. 5 is a diagram showing a configuration of the first impedance element in the modification of the first embodiment.
- FIG. 6 is a diagram showing a configuration of the second impedance element in the modification of the first embodiment.
- FIG. 7 is a diagram illustrating a configuration of a common mode noise reduction device according to another modification of the first embodiment.
- FIG. 1 is a diagram illustrating a configuration of a common mode noise reduction apparatus according to the first embodiment.
- FIG. 2 is a diagram illustrating the characteristics of the common mode noise reduction apparatus according to the first embodiment.
- FIG. 3 is a
- FIG. 8 is a diagram illustrating a configuration of a common mode noise reduction device according to another modification of the first embodiment.
- FIG. 9 is a diagram of a configuration of the common mode noise reduction device according to the second embodiment.
- FIG. 10 is a diagram illustrating a configuration of the common mode noise reduction device according to the first comparative example.
- FIG. 11 is a diagram illustrating the operation of the common mode noise reduction device according to the first comparative example.
- FIG. 12 is a diagram illustrating a configuration of a common mode noise reduction device according to Comparative Example 2.
- FIG. 13 is a diagram illustrating an operation of the common mode noise reduction device according to the second comparative example.
- FIG. 1 is a diagram illustrating a configuration of a common mode noise reduction device 1.
- the common mode noise reduction device 1 is a device for reducing a common mode current (common mode noise) generated by the power converter 10 and flowing to the outside. That is, the common mode noise reduction device 1 includes a housing 20, a power converter 10, a common mode inductor 30, a power wiring 40, a ground wiring 50, a first impedance element 60, and a second impedance element 70.
- the housing 20 accommodates the power converter 10. Thereby, the housing
- casing 20 is formed with conductors, such as a metal, for example.
- the power converter 10 receives power supply power (for example, three-phase AC power) from the power supply PS via the power supply wiring PSL (power supply lines PSL1 to PSL3), performs power conversion using the power supply power, and drives power (for example, (Three-phase AC power) is generated, and driving power is supplied to the load LD via the power wiring 40 (power lines PL1 to PL3).
- the load LD is, for example, a motor.
- the power converter 10 includes a converter 11, a smoothing unit 12, and an inverter 13.
- the converter 11 converts power supply power (for example, AC power) into DC power.
- the converter 11 includes a plurality of diodes D11 to D16, and rectifies power supply power (for example, AC power) using the plurality of diodes D11 to D16.
- a semiconductor such as Si or GaAs may be used, or a wide band gap semiconductor such as SiC, GaN, or diamond may be used.
- the converter 11 supplies the rectified DC power to the smoothing unit 12.
- the smoothing unit 12 receives the rectified DC power from the converter 11 and smoothes the DC power.
- the smoothing unit 12 includes a smoothing capacitor C, and smoothes DC power using the smoothing capacitor C.
- the smoothing unit 12 supplies the smoothed DC power to the inverter 13.
- the inverter 13 receives the smoothed DC power from the smoothing unit 12 via the P-side bus PL and the N-side bus NL, and converts the DC power into driving power (for example, AC power).
- the inverter 13 includes a plurality of switching elements SW1 to SW6 and a plurality of freewheeling diodes D1 to D6. By switching the switching elements SW1 to SW6 at a predetermined timing, the DC power is converted into driving power ( For example, AC power is converted.
- materials for the switching elements SW1 to SW6 and the free-wheeling diodes D1 to D6 a semiconductor such as Si or GaAs may be used, respectively, or a wide band gap semiconductor such as SiC, GaN, or diamond may be used. May be.
- the inverter 13 supplies driving power to the load LD via the power wiring 40.
- a common mode current (common mode noise having a predetermined frequency) is generated and flows to the load LD side via the power wiring 40.
- a load main body LD1 to which power is supplied and a load housing LD3 that accommodates the load main body LD1 are equivalently connected by a parasitic stray capacitance LD2.
- a load ground line LEL that connects the load housing LD3 to the ground potential GND1 is provided in order to release the electric charge charged in the load housing LD3 to the ground potential GND1.
- the common mode voltage Vmc that is the voltage of the load housing LD3 with respect to the ground potential GND1 exceeds the allowable upper limit value. May rise. If the common mode voltage Vmc rises above the allowable upper limit, an operator who touches the load housing LD3 may receive an electric shock, which may cause a safety problem.
- the common mode inductor 30 is disposed between the power converter 10 and the load LD, and is configured such that the power wiring 40 (power lines PL1 to PL3) passes through the inner hole.
- the common mode inductor 30 has an inductance value that selectively suppresses frequency components corresponding to the common mode current among the currents flowing through the power lines PL1 to PL3.
- the common mode inductor 30 has, for example, a ring shape (for example, a rectangular ring shape, a circular ring shape, an elliptical ring shape, etc.).
- the common mode inductor 30 is formed of a magnetic material such as ferrite, for example.
- the power wiring 40 passes through the common mode inductor 30 and connects the power converter 10 to the load LD.
- the power wiring 40 includes, for example, a plurality of power lines PL1 to PL3.
- the power line PL1 transmits U-phase AC power from the power converter 10 to the load LD.
- the power line PL2 transmits, for example, V-phase AC power from the power converter 10 to the load LD.
- the power line PL3 transmits W-phase AC power from the power converter 10 to the load LD.
- the common mode current flowing through the power lines PL1 to PL3 can be suppressed to some extent.
- the common mode current that has flowed into the load LD without being completely suppressed flows out to the ground potential GND1 via the load ground line LEL.
- the common mode voltage Vmc that is the voltage of the load housing LD3 with respect to the ground potential GND1 may increase beyond the allowable upper limit value. If the common mode voltage Vmc rises above the allowable upper limit, an operator who touches the load housing LD3 may receive an electric shock, which may cause a safety problem.
- the ground wiring 50 passes through the common mode inductor 30 and connects the bus 20 of the housing 20 and the power converter 10 (for example, the N-side bus NL) to the ground potential GND1 on the load LD side.
- the ground wiring 50 is configured to recirculate the common mode current that has flowed into the load LD without being suppressed to the housing 20 and the power converter 10 via the ground wiring 50.
- the ground wiring 50 includes a common ground line CEL, a first ground line EL1, and a second ground line EL2.
- the common ground line CEL extends from the load LD side through the common mode inductor 30 to the common node N1.
- the common ground line CEL penetrates the common mode inductor 30 and electrically connects the ground potential GND1 on the load LD side to the common node N1.
- the common ground line CEL is connected to the ground potential GND1 on the load LD side via the load ground line LEL.
- the common ground line CEL connects the load housing LD3 and the common node N1. That is, the common ground line CEL is connected to the ground potential GND1 on the load LD side via the load housing LD3 and the load ground line LEL.
- the common ground line CEL may be connected to a node on the load housing LD3 side on the load ground line LEL, and the ground potential on the load LD side via the load ground line LEL without passing through the load housing LD3. It may be connected to GND1.
- the common ground line CEL is connected to the first ground line EL1 and the second ground line EL2 through the common node N1.
- the ground wiring 50 is configured to divert the common mode current returned by the common ground line CEL to the first ground line EL1 and the second ground line EL2.
- the first ground wire EL1 extends from the common node N1 to the housing 20.
- the first ground line EL1 electrically connects the common node N1 and the housing 20.
- the first ground line EL1 is connected to the ground potential GND2 on the power supply PS side via the housing ground line HEL and the power ground line PEL.
- the first ground wire EL1 is connected to the node N2 on the housing 20 side of the housing ground wire HEL.
- the case ground line HEL connects the case 20 to the power source ground line PEL.
- the parasitic impedance value of the housing ground line HEL from the node N2 to the connection end of the power supply ground line PEL is Z3.
- the power supply ground line PEL connects the power supply PS to the ground potential GND2 so as to supply a reference ground potential to the power supply PS.
- the second ground line EL2 extends from the common node N1 to the bus of the power converter 10 (for example, the N-side bus NL).
- the second ground line EL2 electrically connects the common node N1 and the bus of the power converter 10 (for example, the N-side bus NL).
- the second ground wire EL2 is connected to the N-side bus NL of the power converter 10.
- the N-side bus NL is connected to the power supply PS via a plurality of diodes D14 to D16 and a power supply wiring PSL (power supply lines PSL1 to PSL3).
- the first impedance element 60 is provided between the housing 20 and the load LD on the ground wiring 50.
- the first impedance element 60 is provided on the first ground line EL1. That is, the first impedance element 60 has one end 60a connected to the node N2 and the other end 60b connected to the common node N1.
- the first impedance element 60 has, for example, an impedance value Z1.
- the second impedance element 70 is provided between the bus (for example, the N-side bus NL) of the power converter 10 on the ground wiring 50 and the load LD.
- the second impedance element 70 is provided on the second ground line EL2. That is, the second impedance element 70 has one end 70a connected to the common node N1 and the other end 70b connected to the N-side bus NL.
- the second impedance element 70 has, for example, an impedance value Z2.
- the ground on the power converter 10 side is provided.
- the line is divided into two systems (first ground line EL1 and second ground line EL2), and one of the lines (first ground line EL1) is grounded on the power converter 10 side via the first impedance element 60.
- the other (second ground wire EL2) is connected to the DC side potential (N side bus NL) of the power converter 10 via the second impedance element 70, respectively.
- the first impedance element 60 and the second impedance element 70 have impedance values Z1 and Z2 corresponding to the common mode current to be passed.
- the second impedance element 870 is configured by a capacitor C802 having a large capacity, and the one-dot chain line in FIG. It may be considered that it is better to positively return the common mode current to the power converter 10 side as indicated by the arrow.
- This condition corresponds to a case where the impedance value Z2 of the second impedance element 70 is made small and the impedance value Z1 of the first impedance element 60 is made infinite in the configuration of FIG.
- the common mode flows from other peripheral devices to the power supply PS through the ground potential GND2 and the power supply ground line PEL.
- the common mode current flowing into the ground wiring 50 flows to the ground potential GND1 via the second ground line EL2, the common ground line CEL, and the load ground line LEL, the common mode that is the voltage of the load housing LD3 with respect to the ground potential GND1.
- the voltage Vmc may increase beyond the allowable upper limit value. If the common mode voltage Vmc rises above the allowable upper limit, an operator who touches the load housing LD3 may receive an electric shock, which may cause a safety problem.
- the common mode noise reduction apparatus 900 is not provided with the second ground wire EL2 and the second impedance element 70 (see FIG. 1).
- the first impedance element 860 is constituted by a capacitor C901 having a large capacity, as shown by a solid line arrow in FIG. It is considered that it is better to positively return the common mode current to the housing 20 side.
- This condition corresponds to the impedance value Z1 of the first impedance element 60 being small and the impedance value Z2 of the second impedance element 70 being infinite in the configuration of FIG.
- the first ground line EL1 and the second ground line EL2 are prepared as a return path for the common mode current from the load LD side, and the first ground line EL1 and the second ground line EL2 are prepared.
- a first impedance element 60 and a second impedance element 70 are provided on the ground wire EL2.
- the impedance value Z2 of the second impedance element 70 when the impedance value Z2 of the second impedance element 70 is lowered from infinity, a component that cannot be absorbed by the second ground wire EL2 because it cannot be lowered below the lower limit value Z2min (see FIG. 3).
- the impedance value Z1 of the first impedance element 60 By adjusting the impedance value Z1 of the first impedance element 60 to an appropriate level, the first impedance element 60 can be passed through the power supply ground line PEL via the first ground line EL1.
- the inventor makes a profit and loss due to the magnitude of the impedance value Z1 of the first impedance element 60 and the impedance value Z2 of the second impedance element 70 based on the examination results of the comparative example 1 and the comparative example 2. It was thought that the table shown in FIG.
- the inventor examined a procedure for properly balancing the impedance value Z1 of the first impedance element 60 and the impedance value Z2 of the second impedance element 70 based on the advantages and disadvantages shown in FIG. .
- a lower limit value Z2min (see FIG. 3) that can be taken in consideration of safety is examined. That is, the impedance value Z2 of the second impedance element 70 is determined so as to satisfy a safety condition that defines a requirement relating to safety.
- the safety condition is expressed by the following formula 1, for example.
- the ability to suppress the common mode voltage Vmc voltage, which is insufficient with the impedance value Z2, is compensated by reducing the impedance value Z1 of the first impedance element 60 from infinity.
- the common mode voltage Vmc is suppressed to an allowable upper limit value or less by balancing the impedance value Z1 of the first impedance element 60 and the impedance value Z2 of the second impedance element 70.
- the common mode voltage Vmc is suppressed to an allowable upper limit value or less by balancing the impedance value Z1 of the first impedance element 60 and the impedance value Z2 of the second impedance element 70.
- the common mode current flowing through the first impedance element 60 having the impedance value Z1 flows to the power source PS via the housing ground line HEL and the power source ground line PEL, and then to the power source wiring PSL (power source lines PSL1 to PSL3). Then, it is assumed that the flow returns to the power converter 10.
- the impedance value between the power supply ground line PEL and the housing 20 is substantially equal to the parasitic impedance value Z3 of the housing ground wire HEL, and the common mode impedance from the power supply PS to the power converter 10 is the power supply wiring PSL. Is substantially equal to the parasitic impedance value Z4.
- the combination of the impedance value Z1 + Z3 + Z4 and the impedance value Z2 becomes a hatched area NA in the (Z1 + Z3 + Z4) -Z2 plane shown in FIG.
- the combined impedance of the ground wiring 50 with respect to the common mode current is too large compared to the parasitic impedance value Z0 of the load ground line LEL. It is difficult to return the common mode current that has flowed into the housing 20 and the power converter 10 while passing through the common mode inductor 30, and the required noise reduction effect tends not to be obtained.
- the impedance value of the first impedance element satisfies the noise condition that defines the requirement regarding the noise level to be reduced in the state where the impedance value Z2 of the second impedance element 70 satisfies the safety condition (for example, Equation 1).
- the noise condition is expressed by the following formula 2 corresponding to the hatched portion NA shown in FIG. 3, for example, where f (x, y) is a function indicating the boundary of the noise condition.
- the impedance value Z1 + Z3 + Z4 can be regarded as a parameter Z1 'relating to the impedance value of the first impedance element. Therefore, when the impedance value Z1 + Z3 + Z4 is replaced with the parameter Z1 ', the equation 2 becomes the following equation 2'.
- the common mode voltage Vmc can be suppressed.
- the lower limit value Z1′min (see FIG. 3) is considered.
- the impedance value Z1 of the first impedance element 60 is the noise condition (for example, Expression 2 or Expression 2 ′) in a state where the impedance value Z2 of the second impedance element 70 satisfies the safety condition (for example, Expression 1). And satisfying a current condition that defines a requirement regarding an allowable upper limit level of the common mode current flowing to the outside.
- the current condition is expressed by, for example, Equation 3 below.
- a range that satisfies the above three conditions (safety condition, noise condition, and current condition) (that is, a region above the broken line LZ2 or above the broken line LZ2 and on the broken line LZ1 ′ in the hatched hatching portion NA shown in FIG.
- the region on the right side of the broken line LZ1 ′ can be set to an appropriate range.
- the function f (x, The intersection point P1 between y) and the broken line LZ2 is the final selection point.
- the power wiring 40 connects the power converter 10 to the load LD while passing through the common mode inductor 30, and the ground wiring 50 passes through the common mode inductor 30 while loading the load LD.
- the bus 20 of the housing 20 and the power converter 10 for example, the N-side bus NL.
- the first impedance element 60 is provided between the housing 20 and the load LD on the ground wiring 50, and the second impedance element 70 is connected to the bus line of the power converter 10 on the ground wiring 50. It is provided between the load LD.
- the common mode current flowing back from the load LD side can be shunted to the housing 20 side and the bus side of the power converter 10 with an appropriate balance, so that the common mode voltage Vmc is suppressed below the allowable upper limit value.
- the common mode current flowing out of the common mode noise reduction device 1 can be suppressed to an allowable upper limit level or less.
- the common earth line CEL connects the load LD to the common node N1 while passing through the common mode inductor 30, and the first earth line EL1 encloses the common node N1.
- the second ground line EL2 connects to the body 20 and connects the common node N1 to the bus of the power converter 10 (for example, the N-side bus NL).
- the first impedance element 60 is provided on the first ground line EL1
- the second impedance element 70 is provided on the second ground line EL2.
- the common ground line CEL is connected to the load housing LD3, for example.
- the common mode current that has flowed from the power converter 10 into the load housing LD3 via the load body LD1 and the stray capacitance LD3 can be easily returned to the ground wiring 50 without flowing into the load ground line LEL.
- the first ground line EL1 is connected to the power source PS via the housing ground line HEL and the power source ground line PEL. Thereby, the common mode current shunted to the first ground line EL1 can be recirculated from the power supply PS side to the power converter 10 side.
- the impedance value Z1 of the first impedance element 60 and the impedance value Z2 of the second impedance element 70 are balanced in consideration of safety and the noise level to be reduced. Yes. Thereby, the common mode current returning from the load LD side can be shunted to the housing 20 side and the bus side of the power converter 10 in consideration of safety and the noise level to be reduced.
- the impedance value Z2 of the second impedance element 70 is determined so as to satisfy the safety condition that defines the safety-related requirements. Then, the impedance value Z1 of the first impedance element 60 is determined so as to satisfy a noise condition that defines a requirement regarding a noise level to be reduced in a state where the impedance value Z2 of the second impedance element 70 satisfies the safety condition. ing. Thereby, the impedance value Z1 of the first impedance element 60 and the impedance value Z2 of the second impedance element 70 can be balanced in consideration of safety and the noise level to be reduced.
- the impedance value Z1 of the first impedance element 60 is a noise condition that defines a requirement regarding the noise level to be reduced in a state where the impedance value Z2 of the second impedance element 70 satisfies the safety condition.
- it is determined so as to satisfy a current condition that defines a requirement regarding an allowable upper limit level of the common mode current flowing to the outside. Accordingly, the impedance value Z1 of the first impedance element 60 and the impedance value Z2 of the second impedance element 70 are considered in consideration of safety and the noise level to be reduced, and further consider the influence of noise on peripheral devices. Can be balanced.
- the common mode noise reduction device 1 satisfies the above mathematical expressions 1 'and 2' at the same time.
- the impedance value Z2 of the second impedance element 70 can be determined so as to satisfy the safety condition, and the first impedance condition Z2 satisfies the noise condition in a state where the impedance value Z2 of the second impedance element 70 satisfies the safety condition.
- the impedance value Z1 of the impedance element 60 can be determined.
- the common mode noise reduction apparatus 1 satisfies the above mathematical expressions 1 ', 2', and 3 'at the same time.
- the impedance value Z2 of the second impedance element 70 can be determined so as to satisfy the safety condition, and both the noise condition and the current condition are satisfied when the impedance value Z2 of the second impedance element 70 satisfies the safety condition.
- the impedance value Z1 of the first impedance element 60 can be determined.
- the first impedance element 60 may include a capacitor C1 as shown in FIG. 5A, for example.
- the first impedance element 60 may include, for example, a resistor R1 and a capacitor C1 connected in series as shown in FIG. 5B.
- the first impedance element 60 may include, for example, a resistor R1 and a capacitor C1 connected in parallel with each other as shown in FIG.
- the first impedance element 60 may include, for example, a coil L1 and a capacitor C1 connected in series as shown in FIG. 5D.
- the first impedance element 60 may include, for example, a coil L1, a resistor R1, and a capacitor C1 connected in series with each other as shown in FIG. 5 (e).
- the first impedance element 60 may include, for example, a coil L1, a resistor R1, and a capacitor C1 connected in parallel to each other as shown in FIG. 5 (f). 5A to 5F, the impedance value of the first impedance element 60 can be determined as Z1.
- the first impedance element 60 includes the capacitor C1
- the ground potential GND1 on the load LD side and the ground potential GND2 on the power supply PS side are separated in a DC manner. It is possible to individually ground the load LD side and the power source PS side.
- the damping can be increased and the returned common mode. Current oscillation can be suppressed.
- the peak value of the returned common mode current is reduced with low loss (for example, no loss). Is possible.
- the second impedance element 70 may include a capacitor C2 as shown in FIG. 6A, for example.
- the second impedance element 70 may include, for example, a resistor R2 and a capacitor C2 connected in series as shown in FIG. 6B.
- the second impedance element 70 may include, for example, a resistor R2 and a capacitor C2 connected in parallel with each other as shown in FIG. 6C.
- the impedance value of the second impedance element 70 can be determined as Z2.
- the second impedance element 70 includes the capacitor C2
- the ground potential GND1 on the load LD side and the bus of the power converter 10 (for example, the N-side bus NL) Can be separated in a direct current manner.
- the second impedance element 70 includes the resistor R2
- damping can be increased and vibration of the returned common mode current can be suppressed.
- first impedance element 60 shown in FIGS. 5D to 5F and a specific form of the second impedance element 70 shown in FIGS. 6B to 6C are shown. Can be arbitrarily combined.
- the second ground wire EL ⁇ b> 2 i in the ground wiring 50 i may be connected to the P-side bus PL of the power converter 10. Even in this case, the same effect as in the first embodiment can be realized.
- the power converter 10j may not include the converter 11 (see FIG. 1).
- the power converter 10j receives DC power from the power supply PSj via the power supply wiring PSLj (power supply lines PSL1j, PSL2j), and performs power conversion using the DC power. Even in this case, the same effect as in the first embodiment can be realized.
- FIG. 9 is a diagram illustrating a configuration of the common mode noise reduction device 100.
- the common mode current flowing back in the ground wiring 50 is shunted after passing through the common mode inductor 30, but in the second embodiment, the common mode current returning in the ground wiring 150 is shunted. To the common mode inductor 30.
- the common mode noise reduction device 100 is configured to replace the ground wiring 50, the first impedance element 60, and the second impedance element 70 with the ground wiring 150 and the first impedance.
- An element 160 and a second impedance element 170 are provided.
- the ground wiring 150 includes a common ground line CEL100, a third ground line EL101, and a fourth ground line EL102.
- the common ground line CEL100 connects the load LD to the common node N101.
- the common ground line CEL100 is connected to the load housing LD3, and the load housing LD3 is connected to the common node N101.
- the third ground wire EL101 extends from the common node N101 through the common mode inductor 30 to the housing 20. That is, the third ground line EL101 connects the common node N101 to the housing 20 while penetrating the common mode inductor 30. For example, the third ground wire EL101 is connected to the node N2 on the housing 20 side of the housing ground line HEL.
- the fourth ground line EL102 extends from the common node N101 through the common mode inductor 30 to the bus (for example, the N-side bus NL) of the power converter 10. That is, the fourth ground line EL102 connects the common node N101 to the bus (for example, the N-side bus NL) of the power converter 10 while passing through the common mode inductor 30. For example, the fourth ground line EL102 is connected to the N-side bus NL of the power converter 10.
- the first impedance element 160 is provided on the third ground wire EL101.
- the first impedance element 160 is provided between the common node N101 and the common mode inductor 30 on the third ground line EL101.
- the first impedance element 160 has the impedance value Z1 as in the first embodiment.
- the second impedance element 170 is provided on the fourth ground wire EL102.
- the second impedance element 170 is provided between the common node N101 and the common mode inductor 30 on the fourth ground line EL102.
- the point that the second impedance element 170 has, for example, the impedance value Z2 is the same as that of the second embodiment.
- the common ground line CEL100 connects the load LD to the common node N101
- the third ground line EL101 passes through the common mode inductor 30 and connects the common node N101 to the housing 20.
- a fourth ground line EL102 connects the common node N101 to the bus of the power converter 10 while passing through the common mode inductor 30.
- the first impedance element 160 is provided between the common mode inductor 30 and the common node N101 on the third ground line EL101
- the second impedance element 170 is disposed on the fourth ground line EL102. Are provided between the common mode inductor 30 and the common node N101.
- the common mode current flowing back from the load LD side is diverted to the third ground line EL101 and the fourth ground line EL102, and then passed through the common mode inductor 30, so that the common mode current is generated by the common mode inductor 30. Can be efficiently suppressed.
- the common mode noise reduction device is useful for reducing common mode noise.
Abstract
Description
実施の形態1にかかるコモンモードノイズ低減装置1について図1を用いて説明する。図1は、コモンモードノイズ低減装置1の構成を示す図である。
次に、実施の形態2にかかるコモンモードノイズ低減装置100について図9を用いて説明する。図9は、コモンモードノイズ低減装置100の構成を示す図である。
Claims (12)
- 負荷に電力を供給する電力変換器と、
前記電力変換器を収容する筐体と、
前記電力変換器と前記負荷との間に配置されたコモンモードインダクタと、
前記コモンモードインダクタを貫通し、前記電力変換器を前記負荷に接続する電力配線と、
前記コモンモードインダクタを貫通し、前記負荷を前記筐体及び前記電力変換器の母線に接続する接地配線と、
前記接地配線上における前記筐体と前記負荷との間に設けられた第1のインピーダンス要素と、
前記接地配線上における前記電力変換器の母線と前記負荷との間に設けられた第2のインピーダンス要素と、
を備えたことを特徴とするコモンモードノイズ低減装置。 - 前記接地配線は、
前記コモンモードインダクタを貫通し、前記負荷を共通ノードに接続する共通アース線と、
前記共通ノードを前記筐体に接続する第1のアース線と、
前記共通ノードを前記電力変換器の母線に接続する第2のアース線と、
を有し、
前記第1のインピーダンス要素は、前記第1のアース線上に設けられ、
前記第2のインピーダンス要素は、前記第2のアース線上に設けられる
ことを特徴とする請求項1に記載のコモンモードノイズ低減装置。 - 前記共通アース線は、前記負荷の筐体に接続されている
ことを特徴とする請求項2に記載のコモンモードノイズ低減装置。 - 前記第1のアース線は、筐体アース線及び電源アース線を介して電源に接続されている
ことを特徴とする請求項2に記載のコモンモードノイズ低減装置。 - 前記接地配線は、
前記負荷を共通ノードに接続する共通アース線と、
前記コモンモードインダクタを貫通し、前記共通ノードを前記筐体に接続する第3のアース線と、
前記コモンモードインダクタを貫通し、前記共通ノードを前記電力変換器の母線に接続する第4のアース線と、
を有し、
前記第1のインピーダンス要素は、前記第3のアース線上における前記共通ノードと前記コモンモードインダクタとの間に設けられ、
前記第2のインピーダンス要素は、前記第4のアース線上における前記共通ノードと前記コモンモードインダクタとの間に設けられた
ことを特徴とする請求項1に記載のコモンモードノイズ低減装置。 - 前記共通アース線は、前記負荷の筐体に接続されている
ことを特徴とする請求項5に記載のコモンモードノイズ低減装置。 - 前記第1のアース線は、筐体アース線及び電源アース線を介して電源に接続されている
ことを特徴とする請求項5に記載のコモンモードノイズ低減装置。 - 前記第1のインピーダンス要素のインピーダンス値と前記第2のインピーダンス要素のインピーダンス値とは、安全面及び低減すべきノイズレベルを考慮して、バランスがとられている
ことを特徴とする請求項1に記載のコモンモードノイズ低減装置。 - 前記第2のインピーダンス要素のインピーダンス値は、安全面に関する要求を規定する安全条件を満たすように決められており、
前記第1のインピーダンス要素のインピーダンス値は、前記第2のインピーダンス要素のインピーダンス値が前記安全条件を満たす状態において、低減すべきノイズレベルに関する要求を規定するノイズ条件を満たすように決められている
ことを特徴とする請求項8に記載のコモンモードノイズ低減装置。 - 前記第1のインピーダンス要素のインピーダンス値は、前記第2のインピーダンス要素のインピーダンス値が前記安全条件を満たす状態において、低減すべきノイズレベルに関する要求を規定するノイズ条件を満たすとともに、外部へ流れ出すコモンモード電流の許容上限レベルに関する要求を規定する電流条件を満たすように決められている
ことを特徴とする請求項8に記載のコモンモードノイズ低減装置。 - 前記第1のインピーダンス要素のインピーダンス値に関するパラメータをZ1’、前記第2のインピーダンス要素のインピーダンス値をZ2、安全面に関する要求を規定する安全条件の境界を示す値をZ2minとし、低減すべきノイズレベルに関する要求を規定するノイズ条件の境界を示す関数をf(x,y)とすると、前記コモンモードノイズ低減装置は、
Z2≧Z2min、かつ、(Z1’,Z2)≦f(x,y)
を満たす
ことを特徴とする請求項8に記載のコモンモードノイズ低減装置。 - 外部へ流れ出すコモンモード電流の許容上限レベルに関する要求を規定する電流条件の境界を示す値をZ1’minとすると、前記コモンモードノイズ低減装置は、さらに、
Z1’≧Z1’min
を満たす
ことを特徴とする請求項11に記載のコモンモードノイズ低減装置。
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JP2013512919A JP5362139B1 (ja) | 2012-10-25 | 2012-10-25 | コモンモードノイズ低減装置 |
US14/433,707 US9595881B2 (en) | 2012-10-25 | 2012-10-25 | Common mode noise reduction apparatus |
PCT/JP2012/077631 WO2014064807A1 (ja) | 2012-10-25 | 2012-10-25 | コモンモードノイズ低減装置 |
CN201280076654.1A CN104756380B (zh) | 2012-10-25 | 2012-10-25 | 共模噪声降低装置 |
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US9595881B2 (en) | 2017-03-14 |
US20150280602A1 (en) | 2015-10-01 |
JPWO2014064807A1 (ja) | 2016-09-05 |
CN104756380B (zh) | 2017-12-01 |
CN104756380A (zh) | 2015-07-01 |
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