JPH0847244A - Noise-proof device and noise-proof filter of power converter - Google Patents

Abstract

PURPOSE:To eliminate the noises generated by the power control semiconductor of a power converter effectively by a method wherein the arrangement of filters, the power control semiconductor, power lines and its housing is optimized. CONSTITUTION:A semiconductor switching unit 13 and both filters 1A and 1B are housed in a shielded housing 14 having an airtight structure. With this constitution, noises emitted from the power control semiconductor itself, power lines between the power control semiconductor and both the filters 1A and 1B, both the filters 1A and 1B themselves and power lines between both the filters 1A and 1B and the housing 14 hardly leak out from the housing 14 and harmful influences of the noises upon the other devices outside the housing can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise prevention device for a power converter, and more particularly to a filter for preventing noise of the power converter, an arrangement of power lines and a storage container, a structure of the filter, and a relay (hereinafter referred to as a relay). The present invention relates to technology for preventing noise generated by control.

[0002]

2. Description of the Related Art For example, in a conventional electric vehicle, a DC motor was mainly used as a prime mover. However, due to the problem of intense sparks and durability between the brush and the commutator, high voltage and high speed were adopted. There was a limit to the operation, and it was difficult to make it smaller and more efficient. Recently, with the advent of power semiconductor devices capable of high-speed switching of large currents brought about by advances in semiconductor technology, it has become possible to easily generate alternating current from a direct current power supply.

This solves the problems of the brush and the commutator, and by adopting an AC motor capable of ensuring durability, it has opened up the possibility of an efficient and high-output electric vehicle using higher voltage power. Such an electric vehicle is proposed in, for example, Japanese Patent Application No. 6-13434. In addition, an electric vehicle or the like is provided with a complicated electric device, which includes a large number of relays, which often need to control a large current. For example, when an AC induction motor is adopted as a prime mover of an electric vehicle and a model in which the number of poles can be changed to improve low speed performance is adopted, a relay may be used to change the wiring. Of course, it is possible to use a semiconductor to configure everything without using a relay, but in a field that does not require a high switching speed, a relay is often used because it leads to cost reduction.

[0004]

However, when a power converter using a power control semiconductor is applied to an electric vehicle, for example, the electric vehicle has a wide speed range and it is necessary to drive the power control semiconductor at a high speed. Occurs. In this case, the current is cut off or connected at high speed to generate harmonics, and strong electrical noise is emitted, especially strong electromagnetic waves when the frequency is increased. Therefore, when an electric vehicle or the like, which is expected to be highly computer-controlled in the future, is equipped with the above-described power conversion device using the power control semiconductor, a strong radio noise (hereinafter referred to as noise) generation source and a precision computer are generated. Since they live close together, there is a problem that the installed computer is disturbed and, in the worst case, the power control semiconductor itself is destroyed.

Further, when the above-mentioned relay is used, in the process of connecting or disconnecting the contacts, there is a vibration phenomenon called chattering in both the ON operation and the OFF operation, gradually increasing the connection or disconnection time, and finally connecting or disconnecting completely. Be cut off. During the occurrence of this vibration phenomenon, the connection or disconnection operation of the relay contacts is executed while an arc is blown between the contacts and at the same time a powerful noise is emitted. The intensity of this noise is considerable, and the vehicle-mounted computer may malfunction due to an obstacle caused by the noise at the moment the relay operates. In particular, when an inductive load such as a motor is connected to the relay, the arc flying between the contacts of the relay becomes large, and as a result, the influence of noise also becomes large. Also, from the viewpoint of the durability of the relay itself, it is desirable to avoid arcing. As a usual measure, the arc can be weakened by providing a capacitor in parallel with the contact, but it is often insufficient as a measure against noise.

The present invention has been made in view of such conventional problems, and by optimizing the arrangement of the filter, the power control semiconductor, the power line, and the storage container in the power conversion device, the power control semiconductor is removed. We provide a noise prevention device that effectively prevents the noise that is generated, and also a filter that is devised to remove the noise current that is superimposed on the current that flows in the power line. Furthermore, the current that flows in the power line is turned on and off by a relay. It is an object of the present invention to provide a device that completely prevents the noise generated as a result.

[0007]

Therefore, the present invention (claim 1) provides a noise prevention device for preventing noise in a power conversion device having a power control semiconductor interposed between a power supply and a load. Filters are installed close to the power control semiconductor side on the bus line between the power source and the power control semiconductor and the output line between the power control semiconductor and the load, respectively. It was configured with a sealed containment vessel that contained both filters and was shielded.

Further, according to the present invention (claim 2), when the power conversion device is mounted on an automobile, the busbar and the output line are arranged in a passage having a sealed structure formed in a vehicle body of the automobile. Configured to set up. Further, according to the present invention (claim 3), there is provided a shield in which the input signal line and the output signal line of the control means for controlling the power control semiconductor of the power conversion device are formed on the vehicle body of the automobile separately from the passage. It was arranged to be installed in the passage of the sealed structure.

Further, according to the present invention (claim 4), the filter comprises a core having magnetic permeability in a DC line, and two sets of windings wound around the core. The windings of are configured so as to be wound so as to cancel each other's magnetic flux. Further, according to the present invention (claim 5), in the case of a three-phase AC line, the filter is formed by winding three sets of windings in the same direction on a winding core.

Further, according to the present invention (claim 6), a power control semiconductor interposed between a power supply and a load, and a load control relay provided between the power control semiconductor and the load. In a noise prevention device for preventing noise of a power conversion device including: When a command to operate the relay is input, the ON operation of the relay is performed by turning on the power control semiconductor O.
The control unit is configured to perform before the N operation and to perform the OFF operation of the relay after the OFF operation of the power control semiconductor.

Further, the present invention (claim 7) comprises a magnetically permeable core and two sets of windings wound around the core.
The pair of windings was constructed by arranging a filter, which was wound in the direction in which the magnetic flux of each other was canceled, in the DC line. Further, according to the present invention (claim 8), a filter having a configuration in which three sets of windings are wound around the winding core in the same direction is arranged in a three-phase AC line.

[0012]

According to the structure of the first aspect, by installing the filters on the bus and the output line respectively, the current noise generated from the power control semiconductor and superimposed on the steady current is first removed. Further, by arranging the filter close to the power control semiconductor side in the storage container, it is possible to suppress radiation noise generated by current noise flowing through the power line between the power control semiconductor and the filter as much as possible. As a result, the radiated noise does not affect various devices installed in the storage container. Further, by incorporating the power control semiconductor and both filters into a shielded enclosure having a closed structure, the power control semiconductor itself, the power line between the power control semiconductor and both filters, and both filters themselves, and both filters and storage. The noise radiated from the power line between the containers is less likely to leak to the outside of the storage container, and the other devices existing outside the storage container are not disturbed.

According to the second aspect of the present invention, by disposing the busbar and the output line in the passage of the shielded sealed structure formed in the vehicle body of the automobile, the power line from the storage container to the power source or the load is connected. The radiated noise generated from the weak current noise that could not be completely removed by the flowing filter can be suppressed as much as possible, without causing trouble to other equipment,
It can be a safe car. Further, by suppressing the noise between the filters and the power source and the load from leaking to the outside of the passage as much as possible, the amount of noise to be suppressed by the filter in advance can be reduced, and as a result, the filter itself can be relatively downsized. Contributes to overall cost reduction and weight reduction.

According to the third aspect of the invention, the input signal line and the output signal line are arranged in a shielded closed passage formed in the vehicle body of the automobile separately from the passage of the power line, so that external noise is prevented. In particular, it is possible to prevent noise from entering from the power line. As a result, the power control semiconductor can be reliably controlled by the signal from the control means, and the output signals from the various sensors can be directly transmitted to the control means.

According to the structure of claim 4, magnetic field lines having different directions are generated in the magnetic circuit constituted by the same winding core to cancel each other, thereby avoiding the magnetic saturation. As a result, the function as a filter can be exhibited even in the DC line, and the current noise generated by the power control semiconductor can be effectively removed. According to the configuration of claim 5, three-phase alternating current is caused to flow in the magnetic circuit configured by providing three sets of windings in the same direction on the same winding core, whereby magnetic saturation is caused depending on the fundamental wave component of the three-phase alternating current. Therefore, the fundamental wave component can be passed as it is, and the harmonic wave can be blocked. As a result, other devices will not malfunction or be destroyed due to the effects of radiation noise due to harmonics, and stable operation is possible even in fields such as electric vehicles where the load must be driven at high speed. Can be secured. Also,
The high voltage caused by the harmonic noise is not repeatedly received and the insulation of the electric motor is not destroyed, and the durability of the electric motor can be improved.

According to the structure of claim 6, when the operation command of the relay is input to the control means, the ON operation of the relay is performed before the ON operation of the power control semiconductor and the relay is turned OFF.
Since the operation is performed after the power control semiconductor is turned off, the relay does not directly turn on or cut off the current flowing through the power line, so that the noise caused by the chattering of the relay can be completely suppressed. As a result, the external device is not affected.

According to the structure of claim 7, magnetic field lines having different directions are generated in the magnetic circuit formed by the same winding core to cancel each other out, thereby avoiding magnetic saturation. As a result, the function as a filter can be exhibited even in the DC line without considering the magnetic saturation, and the current noise superimposed on the DC current can be effectively removed. According to the structure of claim 8, three-phase alternating current is caused to flow in the magnetic circuit configured by applying three sets of windings in the same direction on the same winding core, so that magnetic saturation is caused depending on the fundamental wave component of the three-phase alternating current. Therefore, the fundamental wave component can be passed as it is, and the harmonic wave can be blocked. As a result, other devices will not malfunction or be destroyed due to the effect of radiation noise associated with the harmonics.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 showing the first embodiment of the present invention, a storage battery (battery) 15 is provided to obtain DC power and corresponds to a power supply. The motor 16 is a three-phase AC electric motor and corresponds to a load. Battery 15 and motor 16
In between, the DC voltage obtained from the battery 15 is pulse-width modulated to create a waveform equivalent to AC, and the motor 16
A semiconductor switching unit 13 made up of a power control semiconductor is interposed in order to drive the power source. Examples of power control semiconductors include transistors and thyristors. The DC bus 11 between the semiconductor switching unit 13 and the battery 15 is close to the semiconductor switching unit 13 side and the filter 1
A is installed, and a filter 1B is installed on the AC output line 12 between the semiconductor switching unit 13 and the motor 16 close to the semiconductor switching unit 13 side. Further, in order to prevent the noise radiated from the power control semiconductor, the DC bus 11, the AC output line 12, and the filters 1A and 1B themselves from leaking to the outside, a storage container is provided to incorporate the semiconductor switching unit 13 and the filters 1A and 1B. 14 is installed. The storage container 14 has a sealed structure that shields noise. Storage container 14
The structure of No. 6 is proposed in Japanese Patent Application No. 6-13434.

Next, the operation will be described. In FIG. 1, the DC voltage supplied from the battery 15 is input to the semiconductor switching unit 13 through the DC bus 11. The semiconductor switching unit 13 divides the DC voltage into fine segments by pulse width modulation. This allows
As an effective value, it can function as if it were an exchange. The output after pulse width modulation is used as the AC output line 12
Is supplied to the motor 16 through.

Here, the pulse width modulation is a set of rectangular intermittent waveforms, and harmonics are generated from the intermittent waves. The degree of this harmonic is closely related to the speed of interruption, and if the speed of interruption is slow, it does not cause much trouble, but
Strong electromagnetic waves are generated at high speed. Electromagnetic waves are also radiated from the semiconductor switching unit 13 itself composed of a power control semiconductor, but the semiconductor switching unit 1
Since all the wires extending from 3 function as an antenna,
The longer the distance of the electric wire, the greater the influence of radiation noise due to electromagnetic waves.

Therefore, as a countermeasure, the filter 1
Since A and 1B are provided on the DC bus 11 and the AC output line 12 close to the semiconductor switching unit 13, the radiation noise from the electric wires from the power control semiconductor to the filters 1A and 1B in the storage container 14 is minimized. It is suppressed, and it is possible to prevent influence on various devices installed in the storage container 14.

Further, since the storage container 14 has a shielded closed structure, electromagnetic waves are rarely blocked by the storage container 14 and leak to the outside beyond the storage container 14. As a result, other devices will not malfunction or be destroyed due to the influence of radiation noise, and stable operation can be ensured even when the device is installed in, for example, an electric vehicle in which the load must be driven at a high speed.

Further, since the filters are provided on the DC bus side and the AC output line side, noise propagating in all directions can be prevented. When installing a filter on the signal line instead of the above-mentioned power line, install the filter and avoid noise from flowing through the ground.
It is desirable to have an insulating structure using a photoelectric tube or the like.

In addition, although the power conversion device has been described in the present embodiment as a device for converting direct current into alternating current, it also includes a device for converting alternating current into direct current. The same applies to the following examples. Next, FIG. 2 shows a second embodiment of the present invention. Figure 2
Then, the case where the power converter is mounted in an electric vehicle will be described.

Although not specifically shown in the figure, the power converter is installed inside the body of the electric vehicle. The control means supplies a control signal to the power control semiconductor, and controls the power control semiconductor by inputting a signal from a temperature sensor or the like installed in the power control semiconductor.
Like the power converter, it is installed inside the electric vehicle body.

As shown in FIG. 2, the electric vehicle has two motors 16A and 16B at the rear of the vehicle body, an engine 28 for supplementing the power of the motors, and a transfer unit for shifting the power and transmitting the power to the wheel 30. 27
A half shaft 29 for transmitting the output from the transfer unit 27 to the wheel 30 via a motor, a battery case 25 also serving as a backbone type chassis extending from the rear part to the front part of the vehicle body, a part of the chassis and the vehicle body. A power line passage 23 and a signal line passage 24 are formed by running the battery case 25 side by side in parallel. FIG. 3 shows a sectional view taken along the line AA of FIG. A battery row 22 is built in the battery case 25.
The battery row 22 is, for example, a 12V battery 1
Zeros are connected in series in two columns. The power line passage 23 is for passing the DC bus 11 and the AC output line 12 therein,
In order to prevent electromagnetic waves from leaking to the outside, the chassis and part of the vehicle body are used as a shielded sealed structure. Further, the signal line passage 24 is configured to be separated from the power line passage 23 in order to prevent electromagnetic waves from entering from the outside and not to be carried on the signal line, and has a sealed structure in which a chassis or a part of the vehicle body is used for shielding. The configuration is

Next, the operation will be described. As described with reference to FIG. 1, since the storage container 14 containing the filters 1A and 1B and the semiconductor switching unit 13 is provided, the high frequency component can be attenuated to a considerable extent. Further, in the present invention, since the direct current bus line 11 and the alternating current output line 12 are arranged in the power line passage 23, the emission of electromagnetic waves from the electric wire caused by the extension of the electric wire is blocked in the power line passage 23, It will not leak outside.

Therefore, noise can be suppressed, and a safe electric vehicle can be provided without causing any trouble to other devices. Further, since the power line passage 23 is provided, the emission of electromagnetic waves can be further suppressed, so that the filters 1A and 1B can be downsized accordingly, which contributes to the overall cost reduction and weight reduction. Further, the signal line passage 24 is the power line passage 2
By having the same configuration as that of No. 3 and isolating from the power line passage 23, it is possible to prevent external noise, particularly noise from the power line from entering, and as a result, control or protection of the power control semiconductor can be reliably performed. .

If the power line passage 23 is divided and shielded for the DC bus 11 and the AC output line 12, and the DC bus 11 and the AC output line 12 are arranged in the shield, the DC bus 11 will be generated.
And the AC output line 12 no longer interfere with each other,
It is possible to further suppress noise. Further, if the signal line passage 24 is also divided and shielded for the input signal line and the output signal line, and the input signal line and the output signal line are respectively disposed therein, noise interference between the input and output signal lines can be suppressed. I can.

Next, FIGS. 4 to 7 show an embodiment of a noise removing filter for a DC line (the invention of claim 7). The filter 33 is formed by applying two sets of windings 31A and 31B of the same number or the same number within the range of manufacturing error to a winding core 32 having a magnetic permeability of equal to or higher than that of ferrite. The winding directions are such that the magnetic fluxes generated by the two sets of windings 31A and 31B cancel each other out.

The filter 33 is shown in FIGS.
3 is used for the DC bus 11 between the battery 15 and the semiconductor switching unit 13 of the power converter of FIG. 1, and shows three connection methods when applied to the filter 1A. In FIG. 5, the a and b terminals of the filter 1A are connected to the a ′ and b ′ terminals, respectively, in FIG. 6, the a ′ and b terminals are connected, and in FIG.
The terminal is connected to the negative terminal of the semiconductor switching unit 13.

Next, the operation will be described with reference to FIG. It is well known that a filter is constructed using ferrite, but it seems that a device for direct current requires a unique device. That is, there is almost no effect even if a filter using general ferrite is used for the DC bus. When pursuing the cause of this, the phenomenon of magnetic saturation is avoided if the direction of the current constantly changes like alternating current. However, in an electric vehicle, for example, when the motor 16 is operating as an electric motor, the current flows from the battery 15 The current flows in one direction toward the motor 16, and when the motor 16 is operated as a generator, the current flows in the opposite direction. In this way, when the unidirectional current flow continues for a while, magnetic saturation occurs in the winding core that constitutes the magnetic circuit, and even if noise, that is, high-frequency voltage fluctuation is input to the winding, Since it does not have the ability to accept as a magnetic field line, it becomes the same as when a coil of non-magnetic material is energized, and the function of erasing it in response to the voltage fluctuation is lost. In other words, the function as a filter is lost.

Therefore, the two coils 31A,
Approximately the same number of windings 31B, apply the same current to both,
Magnetic field lines having different directions are generated in the magnetic circuit constituted by the same winding core 32 to cancel each other to avoid magnetic saturation. Therefore, in the two sets of windings, currents are simultaneously applied to the windings in opposite directions. As a result, the magnetic saturation phenomenon is avoided, and the steady current of the noise superimposed on the steady current is passed through the DC line as it is,
Only noise can be removed.

It is to be noted that the two sets of windings are basically wound in the same number, but if not so, the effect is not inevitable, and even if the number of windings is different, the electromagnetic noise flowing corresponding to the portion having the same number of windings will flow. Are offset by each other, so the corresponding effects are obtained. Further, in order to connect the filter 33 to the DC bus, when two sets of windings of the filter 33 are wound in the same direction, three connecting methods as shown in FIGS. 5 to 7 can be considered. In each of the embodiments shown in FIGS. 5 to 7, since the windings of the coil are in the same direction, a current flows in the same direction from a to a ′ or from b to b ′ in any connection method. , The coils 31A and 31B generate lines of magnetic force having different directions from each other, and the magnetic fluxes cancel each other out. Therefore, it does not cause magnetic saturation,
Even with a DC line, noise can be effectively removed without considering magnetic saturation.

In this embodiment, the case where two sets of windings are wound in the same direction has been described, but the two sets of windings do not necessarily have to be wound in the same direction, but are wound in opposite directions. Good. However, in this case, in order to cancel the magnetic flux generated by the two sets of windings, it is necessary to flow current in the respective windings in the same direction at the same time. Next, FIG. 8 to FIG. 9 show an embodiment of an AC line noise elimination filter (the invention of claim 8).

The filter 43 is constructed by winding three sets of windings 41A, 41B, 41C of the same number or the same number within a manufacturing error in the same direction on a ferrite or a winding core 42 having magnetic permeability equal to or higher than the ferrite. The filter 43 is shown in FIG.
Is applied as the filter 1B of the AC output line of the power conversion device of FIG.

Next, the operation will be described with reference to FIGS. A, b, c of the filter 1B having the above configuration
Connect the terminal to each terminal of the three-phase power supply of the AC output line 12,
Motor 16 which is a three-phase load with a ', b', and c'terminals
The three-phase alternating current generated by the semiconductor switching unit 13 is supplied to the motor 16 via the filter 1B by connecting with. That is, the three-phase alternating current is applied to the filter 1
Input from terminals a, b and c of B, and windings 41A, 41
You will pass B and 41C. Here, for example, since the winding wire of 41A is configured in the same direction as the other winding wires 41B and 41C, the magnetic flux generated at 41B and 41C is generated by the winding core 4
Add to the magnetic flux generated in the winding of 41 A via 2. However, since the magnetic flux generated by the fundamental wave component of the three-phase alternating current is out of phase by 2/3 Π, the magnetic flux due to the fundamental wave generated in the winding of 41A is canceled out as a result,
The sum is zero. Therefore, each winding 41A, 41B, 4
The induced voltage is not generated in 1C, and the power of the fundamental wave component of the three-phase alternating current is supplied to the motor 16 as it is.

On the other hand, the pulse width modulation is a set of rectangular intermittent waveforms, and since harmonics are generated from such intermittent waves, the semiconductor switching unit 13 produces harmonics at the same time as the fundamental wave. Therefore, considering the action of the filter 1B on the third harmonic, which has a particularly large influence, among the higher harmonics, the frequency of the third harmonic is tripled, and at the same time, the phase shift of each phase, that is, 2 / 3Π. Since each phase shift is also tripled, as a result, currents in the same phase and in the same direction are obtained. Then, the in-phase and in-direction components are input from the a, b, and c terminals of the filter 1B, and the windings 41A, 4
You will pass 1B and 41C. Here, for example, 41A
As for the winding of No. 4, the magnetic flux generated at 41B and 41C is added to the magnetic flux generated at the winding of 41A via the winding core 42. In this case, since the magnetic flux generated in each winding has the same phase, a counter electromotive force corresponding to the magnetic flux generated by the three windings is generated in the winding 41A. Due to the generation of this counter electromotive force, the harmonic current flowing through the winding 41A can be minimized. That is,
It acts as if three windings were connected in series to the third harmonic, and it acts like a large resistance to suppress the passage of the harmonic. In principle, the action during this period is the same as the phenomenon that a counter electromotive force is generated on the transformer side when an applied voltage is applied to the transformer, and thus the current flowing into the transformer is reduced.

In reality, not only the third harmonic but also a large number of high-order harmonics are present in the harmonics, but the same applies to high-order harmonics in multiples of three. As described above, by using the filter 1B, magnetic saturation is not caused depending on the fundamental wave component of the three-phase AC current, and therefore the fundamental wave component is allowed to pass as it is, and further, the harmonic wave can be blocked. As a result, other equipment will not malfunction or be damaged by the effect of radiation noise associated with harmonics.
Stable operation can be secured even when applied to a field such as an electric vehicle in which the load must be driven at a high speed. Further, the high voltage caused by the harmonic noise is not repeatedly received and the insulation of the electric motor is not destroyed, so that the durability of the electric motor can be improved. Since it is effective for harmonic noise, the present filter 1B can be applied not only to pulse width modulation of the power converter but also to harmonics generated from other electric devices such as a transformer.

Next, FIG. 10 shows an embodiment of noise prevention of a power converter having a relay. In FIG. 10, a battery 15 is provided to obtain DC power and corresponds to a power supply. Between the battery 15 and the load motor 16, a DC voltage obtained from the battery 15 is pulse-width modulated to create a waveform equivalent to AC,
The semiconductor switching unit 13 is interposed so that the motor 16 can be driven. A relay group 51 is used between the semiconductor switching unit 13 and the motor 16 to change the number of poles of the field coil of the motor 16, for example. When the relay group 51 and the motor 16 are applied to the electric vehicle as shown in the embodiment of FIG. 2, the motor 16A and the relay group 51A,
There are two types, the motor 16B and the relay group 51B. The control unit 52 is for setting the operation timing between the semiconductor switching unit 13 and the relay group 51,
It corresponds to the control means.

Next, the operation will be described. In FIG. 10, when an input signal 53, which is an operation command for the power control semiconductors and the relay group 51 that form the semiconductor switching unit 13, is input to the control unit 52, the relay group 5
The ON operation of No. 1 is performed before the ON operation of the power control semiconductor forming the semiconductor switching unit 13, and the OFF operation of the relay group 51 is performed after the OFF operation of the power control semiconductor.

As a result, the relay group 51 does not directly turn on or off the current flowing through the power line, so that not only the durability of the relays can be secured, but also the relay group 51.
It is possible to completely prevent generation of noise due to the chattering phenomenon. Therefore, the noise does not affect the external device at all. Although different from the embodiment of FIG. 10, in the case where a protective device made of a semiconductor is provided on the bus bar and the protective device is present on the power supply side of the relay, the semiconductor constituting the protective device is provided. By controlling the operation timing between the relay and the relay in the same manner as above, the same effect as above can be obtained.

[0043]

As described above, the present invention (Claim 1).
According to this, by installing filters on the bus and output lines respectively, and by placing the filters close to the power control semiconductor side in the containment vessel, current noise flowing through the power lines between the power control semiconductor and the filter is prevented. The generated radiation noise can be suppressed as much as possible. As a result, the radiated noise does not affect various devices installed in the storage container. Furthermore, by incorporating the power control semiconductor and both filters in a shielded enclosure, the power control semiconductor itself, the power line between the power control semiconductor and both filters, and both filters themselves, and both filters and storage. The noise radiated from the power line between the containers is less likely to leak to the outside of the storage container, and the other devices existing outside the storage container are not disturbed.

According to the present invention (Claim 2), when the power converter is mounted on an automobile, the busbar and the output line are
By arranging it inside a passage with a sealed structure formed on the body of an automobile, the radiated noise generated from the busbar and output line can be suppressed as much as possible, and it does not damage other equipment and is safe. It can be a car. In addition, by suppressing the noise between both filters and the power supply and load as much as possible, the amount of noise that should be suppressed by the filter in advance can be reduced, and as a result, the filter itself can be relatively downsized, thus reducing the overall cost and weight. Contribute to.

Further, according to the present invention (Claim 3), the input signal line and the output signal line are provided separately from the power line passage in a passage having a sealed structure formed on the vehicle body of the automobile. Thus, it is possible to prevent external noise, particularly noise from the power line, from entering, and as a result, it is possible to reliably control or protect the power control semiconductor. Furthermore, according to the present invention (Claim 4), magnetic field lines having different directions are generated in the magnetic circuit constituted by the same winding core to cancel each other out to avoid magnetic saturation. The function as a filter can be exhibited, and the current noise generated by the power control semiconductor can be effectively removed.

Further, according to the present invention (Claim 5), a three-phase alternating current is supplied to a magnetic circuit constituted by winding three sets of windings in the same direction on the same winding core, thereby providing a basic three-phase alternating current. Depending on the wave component, magnetic saturation is not caused, so that the fundamental wave component can be passed as it is, and higher harmonics can be blocked. As a result, the harmonics generated by the power control semiconductor will not malfunction or destroy other devices.

Further, according to the present invention (Claim 6), by adjusting the operation timing between the relay and the power control semiconductor, the relay does not directly turn on or cut off the current flowing through the power line. Generation of noise due to chattering can be completely suppressed. As a result, the external device is not affected. Furthermore, according to the present invention (Claim 7), not only the current noise generated by the power control semiconductor but also the current noise generated by other electric equipment is effectively removed in the DC line.

Further, according to the present invention (Claim 8), not only the current noise generated by the power control semiconductor but also the harmonic noise generated by other electric equipment, such as a transformer, is effectively used in the AC line. Remove.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a noise prevention device of a power conversion device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a noise prevention device of a power conversion device showing a second embodiment of the present invention.

3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a configuration diagram of a DC line noise removal filter.

[FIG. 5] Same as above, connection example of filter

[FIG. 6] Another example of connecting the same filter

[Fig. 7] Still another connection example of the same filter

FIG. 8 is a block diagram of a noise removing filter for an AC line.

[FIG. 9] Same as above, connection example of filter

FIG. 10 is a configuration diagram of noise prevention in a power conversion device including a relay.

[Explanation of symbols]

 1A DC noise filter 1B AC noise filter 11 DC bus 12 AC output line 13 Semiconductor switching unit 14 Storage container 23 Power line passage 24 Signal line passage 31A, 31B Winding 32 Winding core 41A, 41B, 41C Winding 42 Winding core 51 relay group 52 control unit 53 input signal 54A signal a 54B signal b

Claims (8)

[Claims] 1. A noise prevention device for preventing noise in a power conversion device having a power control semiconductor interposed between a power supply and a load, comprising: a bus bar between the power supply and the power control semiconductor; A filter is installed close to the power control semiconductor side on the output line between the control semiconductor and the load, and a shielded containment vessel containing the power control semiconductor and both filters is provided. A noise prevention device for a power conversion device, comprising: 2. The bus bar and the output line, when the power converter is mounted in an automobile, are arranged in a shielded passage having a shield structure formed in a vehicle body of the automobile. 1. The noise prevention device for a power converter according to 1. 3. An input signal line and an output signal line of a control means for controlling a power controlling semiconductor of the power converter,
The noise prevention device for a power conversion device according to claim 2, wherein the noise prevention device is arranged in a passage having a sealed structure formed on a vehicle body of the automobile separately from the passage. 4. The filter comprises a core having magnetic permeability in a DC line and two sets of windings wound around the core, the two windings cancel out magnetic flux of each other. The noise prevention device for a power conversion device according to claim 1, wherein the noise prevention device is wound in a direction. 5. The noise prevention device for a power conversion device according to claim 1, wherein said filter has three sets of windings wound in the same direction on a winding core in a three-phase AC line. 6. A noise of a power conversion device comprising a power control semiconductor interposed between a power supply and a load, and a load control relay provided between the power control semiconductor and the load. In the noise prevention device for preventing the relay, when the operation command of the relay is input, the relay is turned on.
A noise prevention device for a power conversion device, comprising a control means for performing an operation before an ON operation of a power control semiconductor and for performing an OFF operation of a relay after an OFF operation of a power control semiconductor. 7. A direct current filter comprising a magnetically permeable winding core and two sets of windings wound around the winding core. Noise prevention filter characterized by being placed on the track. 8. A noise prevention filter, wherein a filter having a structure in which three sets of windings are wound in the same direction on a winding core is arranged in a three-phase AC line.