JP2000323951A - Filter constant setting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate development to an actual filter by efficiently deciding the constant of a filter circuit and to consider the parasitic component of a circuit element. SOLUTION: Respective circuit element units 5 constituting a filter circuit have plural circuit elements 6 and can select capacitors, the plural parasitic components 17 of the circuit elements 6 whose capacitance can be selected, and switches 18 which select and connect the circuit elements 6 and the parasitic components 17. The filter circuit is constituted by combining the circuit element units whose circuit constants are adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a filter constant setting device, and more particularly to a filter constant setting device for setting a noise filter constant for suppressing conduction noise generated from equipment.

[0002]

2. Description of the Related Art FIG.
FIG. 23 is a block diagram showing a schematic configuration of a conventional filter constant setting device disclosed in Japanese Patent Application Publication No. 8 (1994) -209, and FIGS. 23 and 24 are circuit diagrams showing examples of a filter constant setting circuit provided in the conventional device. It is a schematic block diagram. In FIG.
44 is a device under test which is a source of conduction noise, 41 is a filter constant setting circuit composed of a noise filter for suppressing the conduction noise generated by the device under test 44, and 42 is a pseudo power supply network used for conducting noise measurement , 43 are spectrum analyzers connected to the noise output terminal of the artificial power supply network 42 and measuring the noise output terminal voltage. Also,
23, reference numerals 45 to 49 denote circuit element units constituting the filter constant setting circuit 41 of FIG. To be more specific, 45 is a normal mode capacitor unit, 46 is a common mode capacitor unit, 47 is a normal mode choke coil unit, 48 is a common mode choke coil unit, and 49 is a floating coil unit. Further, in the figure, reference numeral 50 denotes a switch for selecting connection to each of these circuit element units, and reference numeral 51 denotes a rotary switch for selecting a circuit element.

According to the above configuration, the switch 50 and the rotary switch 51 are formed by the circuit element units 45 to 49 constituting the filter constant setting circuit 41 without disassembling or soldering the device under test 44. If each unit and each circuit element are appropriately selected using this, the constants of the circuit elements can be easily selected and changed, and as a result, the constants of the filter can be determined efficiently.

[0004]

However, the conventional filter constant setting apparatus described above mainly considers constant selection of circuit elements constituting the filter constant setting circuit 41 as shown in FIG. No consideration is given to parasitic components, such as a resistance component and a reactance component, which are parasitic on the device. Since the circuit element forms a resonance circuit with the parasitic component, the parasitic component affects the attenuation characteristic of the circuit element as shown in FIG. Therefore, FIG.
When the constant set by the second conventional filter constant setting device is used for an actual filter, the expected attenuation effect of the filter cannot be obtained due to different parasitic components, and the constant may need to be reset.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. In addition to being able to efficiently determine a filter constant and considering parasitic components of circuit elements, development into an actual filter is easy. To provide a filter constant setting device.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a filter constant setting device for setting a constant of a filter circuit for suppressing conduction noise generated from equipment, wherein a capacity for forming the filter circuit can be selected. Device element having a simple circuit element and a parasitic component of the circuit element whose capacity can be selected, and setting for selecting the circuit element of the circuit element unit and the capacitance of the parasitic component, and setting the constant of the filter circuit to a predetermined value. Means for setting a filter constant.

[0007] A plurality of types of circuit elements and parasitic components are provided.

The setting means comprises a switch for selecting and connecting a plurality of types of circuit elements and parasitic components.

The circuit element having a plurality of types includes a first group having a large capacitance and a large capacitance interval, and a second group having a small capacitance and a small capacitance interval, and is selected from the first group. By combining the circuit element thus selected with the circuit element selected from the second group, the constants of the circuit elements constituting the filter circuit are changed.

Further, by connecting the circuit elements of the circuit element unit in series or in parallel, the constants of the circuit elements constituting the filter circuit are changed.

Further, the circuit element is constituted by a variable capacitance element.

Further, the circuit element unit is formed in a detachable and replaceable package shape, and is provided with a measuring terminal that can be contacted from the outside.

A switch for selecting and connecting a circuit element and a parasitic component; and a constant adjusting unit for adjusting constants of the circuit element and the parasitic component by mechanically driving and switching the switch. A control unit that controls the operation of the constant adjustment unit.

The control unit has a function of designing a filter circuit pattern from the circuit elements adjusted by the constant adjustment unit and the constants of the parasitic components.

Further, the control section has a function capable of setting manufacturing conditions.

Further, the circuit element unit has a choke coil component, and the control section has a function of designing the choke coil component from the circuit element and the parasitic component constant adjusted by the constant adjusting section. .

A filter constant setting device for setting a constant of a filter circuit for suppressing conduction noise generated from a device, wherein an element mounting area on which a circuit element for forming the filter circuit can be mounted; A circuit element unit having an element corresponding to a parasitic component of a circuit element whose capacity can be selected, a circuit element mounted on the circuit element unit, and a capacitance of an element corresponding to the parasitic component are selected, and a constant of the filter circuit is set. And a setting means for setting the value to a predetermined value.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a schematic configuration of a filter constant setting device according to the present invention. In FIG. 1, reference numeral 1 denotes a filter circuit (noise filter) configured to suppress conduction noise generated from equipment, and a filter constant setting circuit capable of arbitrarily setting a constant of the filter circuit. In order to supply and measure the conducted noise, a pseudo power supply network for extracting the noise component by setting the input impedance of the noise to a predetermined value, 3
Is a device under test that is supplied with power through the artificial power supply network 2 and the filter constant setting circuit 1 and operates, and 4 is a spectrum analyzer connected to the noise output terminal of the artificial power supply network 2 and measuring conducted noise. .

FIG. 2 shows an example of a single-phase filter as a schematic configuration of the filter constant setting circuit 1. In FIG.
9, 11 and 15 are circuit element units that constitute the filter constant setting circuit 1. To be more specific, reference numeral 5 denotes a normal capacitor unit, which includes a normal mode capacitor 6, a parasitic resistance component 7 of the capacitor, a parasitic inductive reactance component 8 of the capacitor, and a switch 18 (for selecting an element for changing the capacitance of each element). Here, it is not shown, and is configured as shown in FIG. 3). Reference numeral 9 denotes a common mode capacitor unit, which includes common mode capacitors 10A and 10B, a parasitic resistance component 7 of the capacitor,
It comprises a parasitic induction reactance component 8 of the capacitor and a switch 18 (not shown here, see FIG. 4) for selecting each element. Reference numeral 11 denotes a normal mode choke coil unit, which includes a normal mode choke coil 12, a parasitic resistance component 13 of the choke coil, a parasitic capacitance reactance component 14 of the choke coil, and a switch 18 for selecting each element (not shown in FIG. 5). Reference numeral 15 denotes a common mode choke coil unit, which includes a common mode choke coil 16, a parasitic resistance component 13 of the choke coil, a parasitic capacitance reactance component 14 of the choke coil, and a switch 18 for selecting each element (not shown in FIG. 6)
It consists of.

FIGS. 3 to 6 show specific circuit configuration examples of each circuit element unit. FIG. 3 shows a normal mode capacitor unit 5. As shown in FIG. 3, the unit 5 includes a normal mode capacitor 6 having a plurality of types (here, four types) having different capacities for selection, and a plurality of windings having different numbers of turns. A coil 17 corresponding to the parasitic resistance component 7 and the parasitic inductive reactance component 8 shown in FIG. 2 having the same kind (here, four kinds) and a switch 18 for selecting these circuit elements are provided. Note that the capacitor 6
Although an example in which four types of coils 17 are provided is shown, the present invention is not limited to this case, and an arbitrary number is provided according to various conditions (the same applies hereinafter).

FIG. 4 shows the configuration of the common mode capacitor unit 9, and similarly to the unit 5 of FIG. 3, common mode capacitors 10A and 10B having a plurality of types having different capacities, and a plurality of types having the same capacity. , A coil 17 corresponding to the parasitic resistance component 7 and the parasitic induction reactance component 8 shown in FIG.

FIG. 5 shows the configuration of the normal mode choke coil unit 11 having a plurality of types having different capacities.
A normal mode choke coil 12 having a winding interval variable function 19, a wiring resistance 2 having a plurality of types having different capacities and corresponding to the parasitic resistance component 14 shown in FIG.
0 and a switch 18. In addition,
The parasitic capacitance reactance component 13 shown in FIG. 2 is changed by expanding and contracting the entire coil length of the normal mode choke coil 12 by the winding interval variable function 19 and changing the distance between the windings.

FIG. 6 shows a common mode choke coil unit 15 having a plurality of types having different capacities and having a variable winding interval function 19.
6, a wiring resistance 20 having a plurality of types also having different capacities,
And a switch 18. The parasitic capacitance reactance component 13 shown in FIG. 2 is changed by changing the distance between the windings described above.

The operation will be described. The conducted noise generated from the EUT 3 is taken out by the artificial power supply network 2 and measured by the spectrum analyzer 4, and a filter constant for suppressing the conducted noise to a desired level is determined using the filter constant setting circuit 1. As a method of determining the constant, a switch 18 provided in each circuit element unit shown in FIGS. 3 to 6 is used to freely select a circuit element and an element corresponding to a parasitic component of the circuit element, and set the constant to a predetermined value. Set. Also, by connecting these circuit element units in series, a filter constant setting circuit 1 constituting a noise filter is formed. The constants may be set after the circuit element units are connected in series, or conversely, the constants may be set for each unit and then connected in series. In this embodiment, the switch 18 constitutes setting means for selecting the circuit element of the circuit element unit and the capacitance of the parasitic component and setting the constant of the filter circuit to a predetermined value.

In the filter constant setting device according to the present embodiment, as described above, a plurality of types are prepared so that the parasitic component parasitic to the circuit element of the filter constant setting circuit 1 can be varied similarly to the circuit element. In this configuration, the effect of the parasitic component can be examined, and the constant including the parasitic component can be applied when the constant of the circuit element obtained for the actual filter circuit is applied. This eliminates the difference between the case where the present invention is developed and the actual machine, reduces the time loss such as reconsideration and adjustment, and allows the constants of the filter constant setting circuit 1 to be set efficiently.

Embodiment 2 FIG. 7 and 8 show an example of a circuit configuration of a circuit element unit of the filter constant setting circuit 1 according to Embodiment 2 of the present invention. Other configurations are the same as those in FIGS. 1 and 2 described above, and therefore, reference is made to those drawings. FIG. 7 shows a normal mode capacitor unit 5A, a normal mode capacitor 6 having a plurality of types having different capacities, a coil 17 having a plurality of types and corresponding to the parasitic resistance component 7 and the parasitic induction reactance component 8 shown in FIG. Switch 18 for selecting circuit element
It consists of. The configuration up to this point is the same as that of the first embodiment, but in this embodiment,
As shown in FIG. 7, the normal mode capacitor 6 has a large capacity group 21 having a large capacity and a large space between the capacitors.
The small capacity group 22 has a small capacity and a small capacity interval. The common mode capacitor unit 9A (not shown) also has a common mode capacitor 10A in addition to the configuration shown in FIG.
And 10B each have two groups 21 as in FIG.
And 22. Switch 1 is provided for each group.
8 are provided one by one.

FIG. 8 shows a normal mode choke coil unit 11A having a plurality of types having different capacities, each of which has a winding interval variable function 1 for changing the winding interval.
9, a normal mode choke coil 12 composed of a large capacity group 23 having a large capacity and a large capacity interval, a small capacity group 24 having a small capacity and a small capacity interval, and a plurality of types having different capacities. , FIG. 2
And a switch 18 corresponding to the parasitic resistance component 14 shown in FIG. The parasitic capacitance reactance component 13 shown in FIG.
9 by changing the distance between the windings.
The common mode choke coil unit 15A (not shown) also includes a common mode choke coil 16 having two groups 23 and 2 in the same manner as in FIG.
4.

The operation will be described. In this embodiment, as in the first embodiment, the switch 18
Is selected, and the constant of the filter constant setting circuit 1 is set. At this time, in the present embodiment, as described above, in the circuit element unit of the filter constant setting circuit 1, a plurality of types of circuit elements having different capacities are replaced with a large capacity and a large capacity interval. A large group,
Since it is composed of two groups of small capacity and small capacity interval, one element each having a large capacity and one element having a small capacity are selected by the switch 18 provided for each group. Set a constant.

As described above, in this embodiment, in the circuit element unit of the filter constant setting circuit 1, a plurality of types of circuit elements are grouped into a group having a large capacitance and a large space between the capacitances. A filter circuit can be set efficiently by configuring a group with small capacitance and small capacitance intervals and changing the capacitance of the circuit element by selecting the capacitance for each group,
A wide and fine constant setting range can be obtained with a small number of circuit elements.

Embodiment 3 9 and 10 show an example of a circuit configuration of a circuit element unit of the filter constant setting circuit 1 according to Embodiment 3 of the present invention. Other configurations are the same as those in FIGS. 1 and 2 described above, and therefore, reference is made to those drawings. FIG. 9 shows a normal mode capacitor unit 5B having a plurality of types having different capacities, having a normal mode capacitor 6 configured by connecting these in series or in parallel, and having a plurality of types having different capacities. 2 includes a coil 17 corresponding to the parasitic resistance component 7 and the parasitic induction reactance component 8 shown in FIG. 2, and a switch 18 used for series and parallel connection and selection of circuit elements. The common mode capacitor unit 9B
9 (not shown), in addition to the configuration shown in FIG. 4, the common mode capacitors 10A and 10B are configured by a plurality of capacitors having different capacities that can be connected in series or in parallel as in FIG.

FIG. 10 shows a normal mode choke coil unit 11B having a plurality of types having different capacities.
Each has a winding interval variable function 19, has a normal mode choke coil 12 configured by connecting them in series or in parallel, and has a plurality of types having different capacities, and corresponds to the parasitic resistance component 14 shown in FIG. Wiring resistance 2
0 and a switch 18 used for series or parallel connection and selection of circuit elements. The parasitic capacitance reactance component 13 shown in FIG. 2 is changed by changing the distance between the windings by the winding interval variable function 19 of the normal mode choke coil 12. Also, in the common mode choke coil unit 15B (not shown), the common mode choke coil 16 is formed of a plurality of coils having different capacities that can be connected in series or in parallel, as in FIG.

The operation will be described. Also in this embodiment, constants of the filter constant setting circuit 1 are set as in the first embodiment. At this time, in this embodiment, as described above, the filter constant setting circuit 1
In the circuit element unit of the above, a plurality of types of circuit elements are configured to be connected in series or in parallel, so by appropriately selecting these circuit elements and connecting them in series or in parallel, , Set a constant.

As described above, in this embodiment, in the circuit element unit of the filter constant setting circuit 1, a desired capacitance can be obtained by connecting a plurality of types of circuit elements in series or in parallel. Is selected, the constant of the filter constant setting circuit 1 can be set efficiently, and a wide constant setting range can be obtained with a smaller number of circuit elements.

Embodiment 4 11 and 13 show an example of the circuit configuration of the circuit element unit of the filter constant setting circuit 1 according to Embodiment 4 of the present invention. Other configurations are the same as those in FIGS. 1 and 2 described above, and therefore, reference is made to those drawings. FIG. 11 shows a normal mode capacitor unit 5C, which has a normal mode capacitor 6C composed of one variable-capacity element and has a plurality of types having different capacities, and corresponds to the parasitic resistance component 7 and the parasitic induction reactance component 8 in FIG. And a switch 18 used for selecting a circuit element. In addition,
The common mode capacitor unit 9C (not shown) also
Common mode capacitors 10A and 10B shown in FIG.
However, as in FIG. 11, it is assumed that it is composed of one variable capacitance element. FIG. 12 shows a specific configuration example of a variable capacitance capacitor 6C. In the figure, reference numerals 25 and 26 denote foil strip-shaped electrodes which are disposed to face each other and are wound substantially concentrically, and reference numeral 27 denotes a dielectric disposed between the electrodes 25 and 26. Note that the electrodes 25 and 2 can be changed in capacitance.
6 can be made to have a variable area. Specifically, the configuration is such that the electrode 26 can be slid with respect to the electrode 25 in the direction of the arrow in FIG.

FIG. 13 shows a normal mode choke coil unit 11C, which has a plurality of types of normal mode choke coils 12, each of which is composed of one variable capacity element having a winding interval variable function 19, and is shown in FIG. It comprises a wiring resistance 20 corresponding to the parasitic resistance component 14 and a switch 18 used for selecting a circuit element. The parasitic capacitance reactance component 13 in FIG. 2 is changed by changing the distance between the windings by the winding interval variable function 19 of the normal mode choke coil 12. Also, in the common mode choke coil unit 15C (not shown), it is assumed that the common mode choke coil 16 is composed of one element whose capacity is variable as in FIG. FIG. 14 shows a specific normal mode choke coil 11C having a variable capacity.
5 shows a configuration example of a common mode choke coil 16C. In the figure, reference numeral 28 denotes a winding, and 29 denotes a magnetic body wound around the winding 28 by the winding 28. In addition, the structure is such that the magnetic body 29 can be slid in and out of the winding 28 in the direction of the arrow so that the capacity can be changed.

The operation will be described. Also in this embodiment, constants of the filter constant setting circuit 1 are set as in the first embodiment. At this time, in this embodiment, as described above, the filter constant setting circuit 1
In this circuit element unit, the circuit elements are configured using variable capacitance elements, so that the capacitances of the capacitor 6C and the coil 12C can be freely changed, and the switch 18 causes the parasitic resistance component 14 shown in FIG. Is selected, the filter constant setting circuit 1 is selected.
Set the constant of.

As described above, in this embodiment, in the circuit element unit of the filter constant setting circuit 1, the circuit element is constituted by a variable capacitance element.
The filter circuit can be set efficiently, the number of circuit elements can be reduced, the assembling process is simplified, and the cost is advantageous.

Embodiment 5 FIG. 15 shows a configuration example of the filter constant setting circuit 1 according to the fifth embodiment of the present invention. Other configurations are the same as those in FIGS. 1 and 2 described above, and therefore, reference is made to those drawings. 15, a filter constant setting circuit 1 includes a base 30, connection terminals 31 arranged on both sides of the base 30, and
Each circuit element unit 32 mounted on the base 30
It consists of. In addition, each circuit element unit 32
Are connected to the connection terminals 31 via the base base 30. As shown in FIG. 15, each circuit element unit 32 is formed in a package shape in which a circuit board is housed in a housing made of metal, resin, or the like, and has a structure that can be easily removed and replaced. Also, each circuit element unit 32 itself has a measuring terminal 33 that can be contacted from the outside, provided outside the housing.
It has a structure that can measure frequency characteristics using an impedance analyzer or the like by itself. It is assumed that the circuit configuration inside each circuit element unit 32 is the same as that described in the first to fourth embodiments.

As described above, in this embodiment, in the filter constant setting circuit 1, each circuit element unit is configured to be detachable and replaceable, and the frequency of each circuit element unit is determined by an impedance analyzer or the like. By adopting a structure capable of measuring the characteristics, the degree of freedom of the filter configuration is increased, and an accurate frequency characteristic of the circuit element unit is obtained, so that the filter circuit can be set efficiently. Further, the number of circuit element units can be reduced.

Embodiment 6 FIG. 16 and 17 show an example of a circuit configuration of a circuit element unit of a filter constant setting circuit according to Embodiment 6 of the present invention. FIG. 16 shows a normal mode capacitor unit 5D, which has an element mounting portion (element mounting area) 36 having a structure capable of mounting a capacitor used in an actual filter, a plurality of types, a parasitic resistance component 7 and a parasitic resistance component. It comprises a coil 17 corresponding to the inductive reactance component 8 and a switch 18 used for selecting a circuit element. The common mode capacitor unit 9D (not shown) is also provided with the capacitor 10A and 10B of FIG. 4 as an element mounting portion having a structure capable of mounting a common mode capacitor used for an actual filter, similarly to FIG. It is assumed that it is provided at the place where

FIG. 17 shows a normal mode choke coil unit 11D. The element mounting portion 3 has a structure capable of mounting a choke coil used for an actual filter.
7, a wiring resistance 20 corresponding to the parasitic resistance component 14 shown in FIG. 2 and a switch 18 used for selecting a circuit element. The common mode choke coil unit 15D (not shown) also has an element mounting portion having a structure capable of mounting a common mode choke coil used in an actual filter, as in FIG.
It is configured to be provided at a position where the common mode choke coil 16 of FIG. 6 is provided.

The operation will be described. In this embodiment, in the normal mode capacitor unit 5D, a normal mode capacitor used for an actual filter is mounted on the element mounting section 36, and then the parasitic resistance component 7
And a coil 17 corresponding to the parasitic induction reactance component 8
Is selected by the switch 18 and a constant is set. The constants are similarly set in the other units.

As described above, in this embodiment, the circuit element unit of the filter constant setting circuit 1 has a structure in which an element mounting portion for mounting a circuit element used for an actual filter is provided. Since the filter attenuation effect can be confirmed by the circuit elements actually used,
The number of steps such as trial production can be reduced, and the filter circuit can be set more efficiently.

Embodiment 7 FIG. FIG. 18 shows a configuration example of a filter constant setting device according to Embodiment 7 of the present invention. FIG.
In 8, 1 is a filter constant setting circuit, 2 is a pseudo power supply network for supplying AC power to the device and determining the input impedance of the noise to a predetermined value and extracting a noise component for measuring conducted noise, and 3 is A device under test that is supplied with power and operates via the artificial power supply network 2 and the filter constant setting circuit 1, 4 is a spectrum analyzer connected to the noise output terminal of the artificial power supply network 2 and measures conducted noise, 34 is a switch Reference numeral 35 denotes a control device for mechanically driving the device 18 to change the element constant, and a control device 35 for comparing the noise level indicated by the spectrum analyzer 4 and controlling the constant adjustment device 34 so as to obtain a predetermined attenuation. The control device 35 may be specifically configured by a computer such as a personal computer.

As described above, in this embodiment, the filter constant setting device includes a constant adjusting device 34 for mechanically driving the switch 18 to change the element constant and a control device 35 for controlling the operation thereof. The control device 35 and the constant adjusting device 34 can automatically perform the operation of adjusting the circuit constant so as to obtain a predetermined attenuation amount by comparing with the noise level indicated by the spectrum analyzer 4. The setting work can be made more efficient.

Embodiment 8 FIG. FIG. 19 shows a flowchart of an example of the functions of the control device 35 of the filter constant setting circuit of FIG. 18 described in the seventh embodiment. As shown in FIG. 19, the control device 35 includes a constant adjusting device 34.
Is driven, thereby switching the switch 18 to extract the constant of each circuit element (step S1).
Next, a circuit component is selected from the obtained circuit element constants (step S2). Next, the constant adjusting device 34 is driven again, thereby switching the switch 18 to extract the constant of the parasitic component of each circuit element (step S3). Next, a print pattern length corresponding to the parasitic component is calculated from the obtained constant of the parasitic component of the circuit element (step S4). A circuit pattern is designed from these results obtained as described above (step S5).

As described above, in this embodiment, the control device 35 of the filter constant setting device has the function of designing the filter circuit pattern from the obtained filter constant, so that the filter circuit can be efficiently configured. This can be set, and efficiency can be improved in actual filter creation.

Embodiment 9 FIG. FIG. 20 is a flowchart showing another example of the function of the control device 35 of the filter constant setting circuit shown in the seventh embodiment. FIG.
At 0, manufacturing conditions such as the filter cost and the capacity and volume of each circuit element are set by the controller 35 (step S20), and a filter constant that meets the condition is detected (step S21). So that
By driving the constant adjusting device 34, a circuit element and a parasitic component of the circuit element are selected, and a filter constant is determined (step S22).

As described above, in this embodiment, in the control device 35 of the filter constant setting device, conditions such as cost, capacity and volume of each circuit element, which are important in manufacturing a filter, are set. By having a function to find the filter constant corresponding to the condition,
The filter circuit can be set efficiently, and the efficiency of the filter manufacturing can be improved.

Embodiment 10 FIG. FIG. 21 shows a flowchart of another example of the function of the control device 35 of the filter constant setting circuit according to the present invention. As shown in FIG. 21, the control device 35 drives the constant adjusting device 34, thereby switching the switch 18 to extract the constant of each circuit element (step S31). Next, a core material, a winding material, and the like are selected from the obtained circuit element constants, and a choke coil is designed based on the result (step S3).
2). Next, a constant of a parasitic component of each circuit element is extracted (step S33). Next, the distance between the windings of the coil is derived from the obtained constant of the parasitic component of the circuit element (step S34). A choke coil including a parasitic component is designed from the results obtained in this manner (step S35).

As described above, in this embodiment, the control device 35 of the filter constant setting device has the function of designing the circuit pattern of the filter from the obtained filter constant, so that the filter can be efficiently controlled. The circuit can be set, and the efficiency of the filter can be improved.

[0052]

According to the present invention, there is provided a filter constant setting device for setting a constant of a filter circuit for suppressing conduction noise generated from a device, wherein a circuit capable of selecting a capacitance for constituting the filter circuit. A circuit element unit having an element and a parasitic component of a circuit element whose capacitance can be selected;
Setting means for selecting the capacitance of the circuit element and the parasitic component of the circuit element unit, and setting the constant of the filter circuit to a predetermined value, so that not only the circuit element, but also the parasitic component of the circuit element, Since the capacitance can be selected by the setting means, the effect of the parasitic component can be examined.
By adapting the constants including the parasitic components when applying the constants of the circuit elements found in the actual filter circuit,
The difference between the obtained constant and the case where the actual device is developed is eliminated, the time loss such as reexamination and adjustment is reduced, and the filter circuit can be set efficiently.

Since a plurality of types of circuit elements and parasitic components are provided, it is possible to easily select the circuit elements and the parasitic components by the setting means, thereby efficiently setting the filter circuit. You can set constants.

Further, since the setting means is constituted by a switch for selecting and connecting a plurality of types of circuit elements and parasitic components, the circuit element and the parasitic component can be easily selected by this switch. Therefore, the constant of the filter circuit can be set efficiently.

The circuit element having a plurality of types includes a first group having a large capacitance and a large capacitance interval, and a second group having a small capacitance and a small capacitance interval, and is selected from the first group. The constants of the circuit elements constituting the filter circuit are changed by combining the circuit elements thus selected with the circuit elements selected from the second group, so that the constants of the filter circuit can be set efficiently. With a small number of circuit elements, a wide and fine constant setting range can be obtained.

Also, by connecting the circuit elements of the circuit element unit in series or in parallel to change the constants of the circuit elements constituting the filter circuit, the constants of the filter circuit can be set efficiently. In addition to this, it is possible to obtain a wide and narrow set range of constants with a small number of circuit elements.

Further, since the circuit elements are composed of variable capacitance elements, the constant of the filter circuit can be set efficiently, the number of circuit elements can be reduced, and the manufacturing process can be simplified. It is also advantageous in terms of cost.

Further, since the circuit element unit is formed in a detachable and replaceable package shape and is provided with a terminal for measurement that can be contacted from the outside, the degree of freedom of the filter configuration is increased and the circuit for measurement is provided. By measuring the frequency characteristics using the impedance analyzer or the like of the unit alone with the terminal, an accurate frequency characteristic of the circuit element unit can be obtained, and the constant of the filter circuit can be set efficiently.

The setting means includes a switch for selecting and connecting the circuit element and the parasitic component, and a constant adjusting section for adjusting the constant of the circuit element and the parasitic component by mechanically driving and switching the switch. A control unit for controlling the operation of the constant adjustment unit, the operation of adjusting the constant of the filter circuit can be automatically performed by the control unit and the constant adjustment unit, and the setting of the constant of the filter circuit can be updated. Efficiency can be improved.

Further, since the control unit has a function of designing a filter circuit pattern from the constants of the circuit element and the parasitic component adjusted by the constant adjustment unit, the constants of the filter circuit can be set efficiently. At the same time, efficiency can be improved in actual filter creation.

Further, since the control section has a function for setting manufacturing conditions, it is possible to set conditions such as cost and capacity and volume of each circuit element, which are important when manufacturing a filter circuit. The constant of the filter circuit corresponding to the condition can be obtained, the filter circuit can be set efficiently, and the efficiency of the filter manufacturing can be improved.

Further, the circuit element unit has a choke coil component, and the control section has a function of designing the choke coil component from the circuit element and the parasitic component constant adjusted by the constant adjusting section. Therefore, the filter circuit can be set efficiently, and the efficiency of the filter creation can be improved.

Also, there is provided a filter constant setting device for setting a constant of a filter circuit for suppressing conduction noise generated from equipment, wherein an element mounting area in which a circuit element for forming a filter circuit can be mounted, A circuit element unit having an element corresponding to a parasitic component of a circuit element whose capacity can be selected, a circuit element mounted on the circuit element unit, and a capacitance of an element corresponding to the parasitic component are selected, and a constant of the filter circuit is set. Setting means for setting to a predetermined value, so that the circuit element used for the actual filter is mounted in the element mounting area, and the attenuation effect of the filter circuit can be confirmed by the circuit element actually used. And the like can be reduced, and the constants of the filter circuit can be set more efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a filter constant setting device according to Embodiments 1 to 6 of the present invention.

FIG. 2 is a circuit diagram showing a schematic configuration of a filter constant setting circuit provided in the filter constant setting device of FIG.

FIG. 3 is a diagram showing an example of a specific circuit configuration of a normal mode capacitor unit according to the first embodiment.

FIG. 4 is a diagram showing an example of a specific circuit configuration of the common mode capacitor unit according to the first embodiment.

FIG. 5 is a diagram showing an example of a specific circuit configuration of a normal mode choke coil unit according to the first embodiment.

FIG. 6 is a diagram showing an example of a specific circuit configuration of the common mode choke coil unit according to the first embodiment.

FIG. 7 is a diagram showing an example of a specific circuit configuration of a normal mode capacitor unit according to the second embodiment.

FIG. 8 is a diagram showing an example of a specific circuit configuration of a normal mode choke coil unit according to the second embodiment.

FIG. 9 is a diagram showing an example of a specific circuit configuration of a normal mode capacitor unit according to the third embodiment.

FIG. 10 is a diagram showing an example of a specific circuit configuration of a normal mode choke coil unit according to the third embodiment.

FIG. 11 is a diagram showing an example of a specific circuit configuration of a normal mode capacitor unit according to a fourth embodiment.

12 is a perspective view showing an example of a specific configuration of a normal mode capacitor provided in the unit of FIG.

FIG. 13 is a diagram illustrating an example of a specific circuit configuration of a normal mode choke coil unit according to the fourth embodiment.

14 is a perspective view showing an example of a specific configuration of a normal mode choke coil provided in the unit of FIG.

FIG. 15 is a perspective view showing a configuration of a circuit element unit according to Embodiment 5 of the present invention.

FIG. 16 is a diagram showing an example of a specific circuit configuration of a normal mode capacitor unit according to the sixth embodiment.

FIG. 17 is a diagram illustrating an example of a specific circuit configuration of a normal mode choke coil unit according to the sixth embodiment.

FIG. 18 is a block diagram showing a configuration of a filter constant setting device according to Embodiments 7 to 10 of the present invention.

FIG. 19 is a flowchart showing an operation of a control device provided in the filter constant setting device according to the eighth embodiment of the present invention.

FIG. 20 is a flowchart showing an operation of a control device provided in the filter constant setting device according to the ninth embodiment of the present invention.

FIG. 21 is a flowchart showing an operation of a control device provided in the filter constant setting device according to the tenth embodiment of the present invention.

FIG. 22 is a block diagram showing a configuration of a conventional filter constant setting device.

FIG. 23 is a circuit diagram showing a configuration of a conventional filter constant setting circuit.

24 is a circuit diagram showing a schematic configuration of a filter constant setting circuit provided in the conventional filter constant setting device of FIG.

FIG. 25 is a graph showing the relationship between the amount of attenuation of a circuit element and the frequency that changes under the influence of a parasitic component of the circuit element.

[Explanation of symbols]

1 filter constant setting circuit, 2 artificial power supply network, 3
EUT, 4 spectrum analyzer, 5 normal mode capacitor unit, 6 normal mode capacitor, 7 parasitic resistance component, 8 parasitic inductive reactance component, 9 common mode capacitor unit, 10 common mode capacitor, 11 normal mode choke coil unit, 12 normal Mode choke coil,
13 parasitic resistance component, 14 parasitic capacitance reactance component, 15 common mode choke coil unit, 16
Common mode choke coil, 17 coils, 18
Switch, 19 winding interval variable function, 20 wiring resistance, 26 electrodes, 27 dielectric, 28 windings, 29
Magnetic material, 30 base base, 31 connection terminal, 32 circuit element unit, 33 measurement terminal, 34 constant adjustment device, 35 control device, 36 element mounting section, 37 element mounting section, 41 filter constant setting circuit, 42 pseudo power supply circuit Net, 43 spectrum analyzer, 44 EUT,
45 normal mode capacitor unit, 46 common mode capacitor unit, 47 normal mode choke coil unit, 48 common mode choke coil unit, 49 floating coil unit,
50 switch, 51 rotary switch.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chiharu Miyazaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Yu Uchida 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 5H740 BB08 NN02 5J024 AA02 BA18 CA06 DA01 DA25 EA09 FA04 GA03

Claims (12)

[Claims] 1. A filter constant setting device for setting a constant of a filter circuit for suppressing conduction noise generated from a device, comprising: a circuit element having a selectable capacitance for forming the filter circuit; A circuit element unit having a selectable parasitic element of the circuit element; setting means for selecting the capacitance of the circuit element and the parasitic component of the circuit element unit and setting a constant of the filter circuit to a predetermined value; A filter constant setting device, comprising: 2. The filter constant setting device according to claim 1, wherein a plurality of types of said circuit elements and a plurality of types of said parasitic components are provided. 3. The filter constant setting according to claim 2, wherein said setting means comprises a switch for selecting and connecting a plurality of types of said circuit elements and said parasitic components. apparatus. 4. The circuit element having a plurality of types includes: a first group having a large capacitance and a large capacitance interval; and a second group having a small capacitance and a small capacitance interval. 5. The filter according to claim 3, wherein a constant of the circuit element constituting the filter circuit is changed by combining a circuit element selected from the above and a circuit element selected from the second group. 6. Constant setting device. 5. The constant of the circuit elements constituting the filter circuit is changed by connecting the circuit elements of the circuit element unit in series or in parallel. 2. A filter constant setting device according to 1. 6. The filter constant setting device according to claim 1, wherein said circuit element is constituted by a variable capacitance element. 7. The circuit device according to claim 1, wherein the circuit element unit is formed in a detachable and replaceable package shape, and includes a terminal for measurement that can be contacted from the outside. Filter constant setting device. 8. The switch according to claim 8, wherein the setting unit mechanically drives and switches the switch for selecting and connecting the circuit element and the parasitic component.
The filter constant setting device according to claim 2, further comprising: a constant adjusting unit that adjusts constants of the circuit element and the parasitic component; and a control unit that controls an operation of the constant adjusting unit. 9. The filter constant according to claim 8, wherein the control unit has a function of designing a filter circuit pattern from the constants of the circuit element and the parasitic component adjusted by the constant adjustment unit. Setting device. 10. The filter constant setting device according to claim 8, wherein the control unit has a function capable of setting manufacturing conditions. 11. The circuit element unit having a choke coil component, wherein the function of designing the choke coil component from the constant of the circuit element and the parasitic component adjusted by the constant adjustment section is controlled. The filter constant setting device according to any one of claims 8 to 10, wherein the filter constant setting device is provided. 12. A filter constant setting device for setting a constant of a filter circuit for suppressing a conduction noise generated from a device, comprising: an element mounting area in which a circuit element for forming the filter circuit can be mounted. A circuit element unit having an element corresponding to a parasitic component of the circuit element whose capacity can be selected, and a capacitance of the circuit element mounted on the circuit element unit and an element corresponding to the parasitic component, Setting means for setting a constant of the filter circuit to a predetermined value.