JP6970045B2 - Power converter - Google Patents

Description

The present invention relates to a power conversion device having a plurality of operating states.

In recent years, power conversion devices have realized higher-speed switching operation by technological innovation of the power semiconductor module, which is a main component thereof, and reduced the loss generated from this power semiconductor. As a result, the cooler can be particularly miniaturized, and as a result, the power conversion device can be miniaturized.

For example, in a module parallel type power conversion device having a converter and an inverter and having a plurality of operating states, such as an uninterruptible power supply system (UPS), the device is reduced in size by reducing the size of the cooler. The overall size can be reduced.

To reduce the size of the cooler, it is possible to suppress the heat generation of the device by constructing a structure in which the cooling fluid of the cooler flows efficiently.

In Patent Document 1, a wind direction plate that is inclined with respect to a heating element located on the windward side of the heat removing fluid is arranged, and cooling air that has passed through the heating element on the windward side and cooling air that has not passed through the heating element. A cooling mechanism body having a configuration in which the mixed air of the above is blown to a heating element on the leeward side is disclosed.

Further, Patent Document 2 discloses an air conditioner provided with two types of heat radiating fins having different fin spacings in order to perform cooling suitable for the calorific value of the heating element.

Japanese Unexamined Patent Publication No. 2013-16569 Japanese Unexamined Patent Publication No. 2013-137132

However, in the technique described in Patent Document 1, since the wind direction plate is arranged at an angle with respect to the heat removing fluid, the pressure loss of the heat removing fluid increases, so that the cooling effect is reduced and highly efficient cooling is performed. I can't do it.

Further, in the technique described in Patent Document 2, two types of heat radiation fins having different fin spacings are provided, but an increase in the types of fins causes an increase in the cost of the cooling structure, which is not preferable. ..

An object of the present invention is to realize a power conversion device having a plurality of operating states with improved cooling efficiency.

The present invention is configured as follows in order to achieve the above object.

In a power conversion device having a plurality of operating states, a first power conversion unit, a first cooling fin for cooling the first power conversion unit, a second power conversion unit, and the second power conversion unit. It is provided with a second cooling fin for cooling the unit and a cooling device for generating cooling air, and has at least a first operating state and a second operating state. In the first operating state, the first operating state is described. The heat generation amount of the power conversion unit is larger than the heat generation amount of the second power conversion unit, and in the second operating state, the heat generation amount of the first power conversion unit is the heat generation amount of the second power conversion unit. The calorific value is smaller than the calorific value, and the part of the first cooling fin and the second cooling fin are arranged in series with each other with respect to the wind direction of the cooling air generated by the cooling device, and the first cooling fin is arranged. The power conversion unit has a converter that converts the AC power of the AC power supply into DC power, and the second power conversion unit has a chopper that converts the DC power of the DC power supply into a predetermined DC power, at least. The cooling fins of the converter and the cooling fins of the chopper are arranged in series with each other with respect to the wind direction of the cooling air generated by the cooling device, and the converter is located on the wind side of the chopper with respect to the cooling air. A three-phase converter consisting of a U-phase, a V-phase, and a W-phase, which is arranged in the vicinity of the first U-phase power device and the first U-phase power device, and is the first U-phase. A first U-phase gate drive circuit that drives a power device, a first V-phase power device, and a first V-phase power device that is arranged in the vicinity of the first V-phase power device and drives the first V-phase power device. V-phase gate drive circuit and a first W-phase gate drive circuit arranged in the vicinity of the first W-phase power device and the first W-phase power device and driving the first W-phase power device. The first U-phase gate drive circuit and the first V-phase gate drive circuit are arranged so as to face each other, and the first V-phase gate drive circuit and the first W-phase gate are arranged so as to face each other. They are arranged so as to face each other with the drive circuit.

According to the present invention, it is possible to realize a power conversion device having a plurality of operating states with improved cooling efficiency.

It is a schematic block diagram of the power conversion apparatus to which Example 1 is applied. It is a schematic internal block diagram of a converter, an inverter and a chopper. It is an equivalent circuit diagram which shows the structure of a converter. It is an equivalent circuit diagram which shows the structure of an inverter. It is an equivalent circuit diagram which shows the structure of a chopper. It is a figure which shows the appearance of the power device and a cooling fin in Example 1. FIG. It is a figure explaining the flow of electric power in an uninterruptible power supply. It is explanatory drawing of the arrangement composition in Example 1. FIG. It is explanatory drawing of the arrangement composition in Example 2. It is explanatory drawing of the arrangement composition in Example 3. FIG. It is explanatory drawing of the arrangement composition in Example 4. FIG. It is an arrangement explanatory view of the wind direction plate in Example 4. FIG. It is explanatory drawing of the arrangement composition in Example 5. It is a figure which shows the circuit structure of Example 6. It is a figure which shows an example of the wiring layout in the circuit configuration shown in FIG. It is sectional drawing along the BB'line of FIG. It is explanatory drawing of the arrangement composition in Example 7. It is explanatory drawing of the arrangement composition in Example 8. FIG. 3 is a schematic external perspective view of the power conversion device according to the ninth embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

In the following description, an uninterruptible power conversion device will be described as an example of a power conversion device having a plurality of operating states.

(Example 1)
FIG. 1 is a schematic configuration diagram of a power conversion device 100 to which the first embodiment of the present invention is applied.

In FIG. 1, the power conversion device 100 includes a converter 102, an inverter 103, a chopper 104, and an upper control circuit 105 that controls them.

The converter 102 is a three-phase converter that converts the three-phase AC power supplied from the commercial power supply (AC power supply) 106 into DC power and supplies it to the inverter 103.

The inverter 103 is a three-phase inverter that converts the DC power supplied from the converter 102 into three-phase AC power again and supplies it to the load 108.

The chopper 13 boosts or steps down the DC power supplied from the storage battery (DC power supply) 107 to a predetermined voltage, converts it into a predetermined DC power, and supplies the DC power to the inverter 103.

The upper control circuit 105 controls the converter 102, the inverter 103, and the chopper 104.

If the commercial power supply 106 fails for some reason, the chopper 104 supplies the power stored in the storage battery 107 to the inverter 103 as DC power. The inverter 103 converts the DC power supplied from the chopper 104 into AC power and supplies it to the load 108. As a result, the power conversion device 100 can supply power to the load 108 without interruption.

FIG. 2 is a schematic internal configuration diagram of the converter 102, the inverter 103, and the chopper 104. As shown in FIG. 2, the converter 102, the inverter 103, and the chopper 104 include a plurality of rectifying elements and switching elements.

FIG. 3 is an equivalent circuit diagram in the internal configuration of the converter 102.

In FIG. 3, the converter 102 includes three half-bridge circuits 201, 202, 203, and these half-bridge circuits 201, 202, 203 are controlled by a converter control unit (drive unit of a power conversion unit) 204. .. In the converter 102, the three-phase AC power from the three-phase AC commercial power supply 106 is supplied from the R, S, and T terminals and converted into DC power between the positive terminal P and the negative terminal N.

The half-bridge circuit 201 includes an upper arm switching element 21 and a rectifying element 23, and a lower arm switching element 22 and a rectifying element 24. In FIG. 3, an IGBT (Insulated Gate Bipolar Transistor) is used for the switching elements 21 and 22, and a diode is used for the rectifying elements 23 and 24, but the switching elements 21 and 22 are not limited thereto.

The rectifying element 23 is connected in the direction from the emitter of the switching element 21 to the collector. The emitter of the switching element 21 is connected to the collector of the switching element 22 and the AC terminal R. The capacitors 25 and 26 are connected in parallel between the collector of the switching element 21 and the emitter of the switching element 22. In the circuit diagram of FIG. 3, the parallel connection of the capacitor 25 and the capacitor 26 is omitted, and it is indicated by the symbol of a single capacitor. The gate of the switching element 21 is connected to the converter control unit 204.

The rectifying element 24 is connected in the direction from the emitter of the switching element 22 to the collector. The gate of the switching element 22 is connected to the converter control unit 204.

The half-bridge circuit 202 is configured in the same manner as the power conversion unit 201 except that the connection node between the emitter of the switching element 21 and the collector of the switching element 22 is connected to the AC terminal S.

The half-bridge circuit 203 is configured in the same manner as the power conversion unit 201 except that the connection node between the emitter of the switching element 21 and the collector of the switching element 22 is connected to the AC terminal T.

Hereinafter, the operation of the converter 11 will be described with reference to FIG. 3 as appropriate.

The three-phase AC power supplied from the commercial power supply 106 is supplied to the half-bridge circuits 201, 202, 203 of each phase of the converter 102 via the AC terminals R, S, and T. The switching timing of the switching element 21 and the rectifying element 23 of the upper arm of the half bridge circuits 201, 202, 203 and the switching element 22 and the rectifying element 24 of the lower arm are controlled by the converter control unit 204 to rectify the AC power. do.

FIG. 4 is an equivalent circuit diagram showing the configuration of the inverter 103.

In FIG. 4, the inverter 103 includes three half-bridge circuits 301, 302, and 303, and is further controlled by an inverter control unit (drive unit of a power conversion unit) 304. The inverter 103 converts the DC power between the P terminal and the N terminal into three-phase AC power.

The half-bridge circuit 301 is configured in the same manner as the power conversion unit 201 (see FIG. 3) except that the connection node between the emitter of the switching element 21 and the collector of the switching element 22 is connected to the AC terminal U. ..

The half-bridge circuit 302 is configured in the same manner as the power conversion unit 201 (see FIG. 3) except that the connection node between the emitter of the switching element 21 and the collector of the switching element 22 is connected to the AC terminal V. ..

The half-bridge circuit 303 is configured in the same manner as the power conversion unit 201 (see FIG. 3) except that the connection node between the emitter of the switching element 21 and the collector of the switching element 22 is connected to the AC terminal W. ..

Hereinafter, the operation of the inverter 103 will be described with reference to FIG. 4 as appropriate.

The DC power converted by the converter 102 is supplied between the terminal P and the terminal N. The switching timing of the switching element 21 and the rectifying element 23 of the upper arm of the half bridge circuits 301, 302, 303 and the switching element 22 and the rectifying element 24 of the lower arm are controlled by the inverter control unit 304, and this DC power is supplied. It is converted to AC power and output to AC terminals U, V, and W.

FIG. 5 is an equivalent circuit diagram showing the configuration of the chopper 104.

In FIG. 5, the chopper 104 includes a half-bridge circuit 401 and a reactor 406, and is controlled by a chopper control unit (drive unit of a power conversion unit) 405. The chopper 104 mutually converts a low-voltage DC voltage generated by the storage battery 107 and a high-voltage DC voltage between the terminal P and the terminal N.

The half-bridge circuit 401 is configured in the same manner as the half-bridge circuit 201 (see FIG. 3) except that the connection node between the emitter of the switching element 21 and the collector of the switching element 22 is connected to the terminal C.

The reactor 406 connects the positive electrode of the storage battery 107 to the terminal C.

Hereinafter, the operation of the chopper 104 will be described with reference to FIG.

While the switching element 22 of the lower arm of the half-bridge circuit 401 is on, energy is stored in the reactor 406 connected between the storage battery 107 and the terminal C. Next, when the switching element 22 is turned off, the rectifying element 23 of the upper arm is turned on by the counter electromotive voltage generated by the reactor 406. As a result, a voltage obtained by adding the DC voltage of the storage battery 107 and the counter electromotive voltage of the reactor 406 is generated at the output end of the chopper 104. As a result, the chopper 104 boosts the DC voltage of the storage battery 107. The chopper control unit 405 can arbitrarily set the boost ratio by controlling the switching timing of the half-bridge circuit 401.

From the above, in the converter 102, the inverter 103, and the chopper 104 mounted on the power conversion device 100 to which the first embodiment is applied, the switching element 21 and the rectifying element 23 of the upper arm, the switching element 22 of the lower arm, and the chopper 104 are all used. The basic configuration is a two-level half-bridge circuit 20 in which a rectifying element 24 is connected in series.

In the above, the IGBT and the diode are taken as an example of the power device, but the power device is not limited to the IGBT and the diode, and other power devices such as a SiC- MOSFET may be used.

FIG. 6 shows the power device (switching element and rectifying element (21 and 23, 22 and 24) in the power conversion units 201-203, 301-303, 401) 30 in the first embodiment, and is connected to the power device 30. It is a figure which shows the appearance with a cooling fin 40.
The power device 30 of FIG. 6 is, for example, a SiC- MOSFET, and shows the form of a package in which a switching element and a diode are included in one package.
FIG. 6A shows the appearance of the power device 30, and FIG. 6B shows the appearance of the cooling fins 40 connected to the power device 30.

Next, the flow of electric power in an uninterruptible power supply device, which is an example of a power conversion device having a plurality of operating states, will be described with reference to FIG. 7. In FIG. 7, the solid line arrow is the power flow in the normal time (state in which no power failure has occurred), and the broken line arrow is the power flow in the power failure time.

Normally, the electric power from the commercial power source is supplied to the load 108 via the converter 102 and the inverter 103. In this normal time, the operating converter 102 and the inverter 103 mainly generate heat.

Next, since the electric power is not supplied from the commercial power source 106 at the time of a power failure, the electric power from the storage battery 107 is supplied to the load 108 via the chopper 104 and the inverter 103. In this case, the converter 102 is not operating. During this power failure, the operating chopper 104 and the inverter 103 generate heat.

As described above, in the non-stop power conversion device, the operating state of the electric power exists as a first operating state (normal time) and a second operating state (during a power failure), and the heat generation state changes.

That is, in the first operating state, the heat generation amount of the first power conversion unit including the converter 102 and the inverter 103 is larger than the heat generation amount of the second power conversion unit including the chopper 104 and the inverter 103. Further, in the second operating state, the heat generation amount of the first power conversion unit including the converter 102 and the inverter 103 is smaller than the heat generation amount of the second power conversion unit including the chopper 104 and the inverter 103.

The present invention focuses on changes in the heat generation state and realizes a configuration for improving cooling efficiency.

In the example shown in FIG. 7, the converter reactor 500 is connected to the converter 102, and the inverter reactor 700 is connected to the inverter 103. Further, an example is shown in which the DC link capacitor 600 is connected between the converter 102 and the inverter 103 between the P pole 3000P and the N pole 2000N.

FIG. 8 is an explanatory diagram of the arrangement configuration in the first embodiment of the present invention.

In FIG. 8, the cooling air generated by the cooling fan (cooling device) described later flows in the direction of the wind direction Wi (direction from the bottom to the top of FIG. 8).

The U-phase 102U, V-phase 102V, and W-phase 102W of the converter 102 and the U-phase 103U, V-phase 103V, and W-phase 103W of the inverter 103 are arranged so as to be in parallel with respect to the wind direction Wi.

The choppers 104-1 and 104-2 are arranged in series with the converters 102U and 102V with respect to the wind direction Wi.

Further, in each of the converter 102, the inverter 103, and the chopper 104, the power device 30 and the cooling fins 40 connected to the power device 30 are arranged so as to be parallel to the wind direction Wi.

Therefore, the cooling fins 40 of the converter 102 and the cooling fins 40 of the cooling fins 104 of the chopper 104 are arranged so as to be in series with respect to the wind direction Wi. That is, the cooling fins 40 of the converter 102 and the cooling fins 40 of the inverter are the first cooling fins, and the cooling fins 40 of the chopper 104 and the cooling fins 40 of the inverter are the second cooling fins, but the first cooling fins. A part of the above (cooling fin 40 of the converter 102) and the second cooling fin are arranged in series with each other with respect to the cooling air generated by the cooling fan (cooling device) described later.

In the normal state, the converter 102 and the inverter 103 operate, and since the converter 102 and the inverter 103 are arranged in parallel with respect to the wind direction Wi, the cooling air passing through the converter 102 has a thermal effect on the inverter 103. It is thought that this is rare.

Further, it is considered that the cooling air that has passed through the inverter 103 has almost no effect on the converter 102, and the converter 102 and the inverter 103 are hardly affected by the mutual heat of the converter 102, so that the converter 102 and the inverter 103 are cooled efficiently.

Although the chopper 104 is arranged on the leeward side of the converter 102, the amount of heat generated by the chopper 104 is usually small and does not affect the operation.

In the event of a power failure, the chopper 104 and the inverter 103 operate, and since the chopper 104 and the inverter 103 are arranged in parallel with respect to the wind direction Wi, the cooling air passing through the chopper 104 has a thermal effect on the inverter 103. It is thought that this is rare. Further, it is considered that the cooling air that has passed through the inverter 103 has almost no thermal effect on the chopper 104, and the chopper 104 and the inverter 103 are cooled efficiently with almost no influence of the mutual heat.

Although the chopper 104 is arranged on the leeward side of the converter 102, since the converter 102 is not operating at the time of a power failure, the influence of heat generation does not affect the chopper 104 and does not affect the operation.

According to the first embodiment of the present invention, the cooling efficiency of the uninterruptible power conversion device, which is a power conversion device having a plurality of operating states, can be realized without a significant increase in price by the above configuration. be able to.

(Example 2)
Next, Example 2 of the present invention will be described.

The overall configuration of the power conversion device in the second embodiment is the same as the configuration shown in FIG. 1, and the internal configurations of the converter 102, the inverter 103, and the chopper 104 are the same as the configurations shown in FIGS. 3 to 5. , Illustrations and detailed description thereof will be omitted.

FIG. 9 is an explanatory diagram of the arrangement configuration in the second embodiment of the present invention.

In FIG. 9, the difference from the arrangement configuration of the first embodiment shown in FIG. 8 is that the DC link capacitor 600 is arranged on the upstream side (windward side) of the cooling air of the converter 102 and the inverter 103, and the downstream side of the chopper 104. The DCAC reactor 800 is located on the leeward side. The other arrangements shown in FIG. 9 are similar to the example of FIG.

According to the second embodiment, the same effect as that of the first embodiment can be obtained, and since the DC link capacitor 600 is arranged on the upstream side of the cooling air of the converter 102 and the inverter 103, the converter 102 and the converter 102 with respect to the DC link capacitor 600 are arranged. The influence of heat generation (effect of tilting heat) due to the operation of the inverter 103 can be removed.

Further, since the DCAC reactor 800 is arranged on the downstream side of the cooling air of the converter 102, the inverter 103 and the chopper 104, the influence of heat generation (the influence of the tilting heat) on the converter 102, the inverter 103 and the chopper 104 by the DCAC reactor 800 is removed. be able to.

Although the DC link capacitor 600 and the DCAC reactor 800 are omitted in the layout configuration of the first embodiment shown in FIG. 8, the layout configuration is not limited to the layout configuration of the second embodiment.

(Example 3)
Next, Example 3 of the present invention will be described.

The overall configuration of the power conversion device in the third embodiment is the same as the configuration shown in FIG. 1, and the internal configurations of the converter 102, the inverter 103, and the chopper 104 are the same as the configurations shown in FIGS. 3 to 5. , Illustrations and detailed description thereof will be omitted.

FIG. 10 is an explanatory diagram of an arrangement configuration according to a third embodiment of the present invention.

In FIG. 10, the difference from the arrangement configuration of the second embodiment shown in FIG. 9 is the gate drive circuits 102U1D, 102U2D, 102V1D, 102V2D, 102W1D and 102W2D (converters) that drive the devices 30 of the converters 102U, 102V and 102W. The control unit (power conversion unit drive unit) 204) is arranged in the vicinity of each device 30.

The converter 102 has two pairs of the device 30 and the cooling fins 40 for each of the U phase, the V phase, and the W phase, but the U phase and the V phase are arranged at positions adjacent to each other. In the pair of the device 30 and the cooling fin 40, the respective devices 30 are arranged to face each other, and the gate drive circuits 102U2D and 102V1D are arranged to face each other. Further, in the pair of the device 30 and the cooling fins 40 in which the V phase and the W phase are arranged adjacent to each other, the respective devices 30 are arranged so as to face each other, and the gate drive circuits 102V2D and 102W1D are arranged. They are arranged facing each other.

Further, the gate drive circuits 103U1D, 103U2D, 103V1D, 103V2D, 103W1D and 103W2D (inverter control unit (power conversion unit drive unit) 304) for driving the devices 30 of the inverters 103U, 103V and 103W are placed in the vicinity of the respective devices 30. Deploy. The inverter 103 has two pairs of the device 30 and the cooling fins 40 for each of the U phase, the V phase, and the W phase, but the U phase and the V phase are arranged at positions adjacent to each other. In the pair of the device 30 and the cooling fin 40, the respective devices 30 are arranged to face each other, and the gate drive circuits 103U2D and 103V1D are arranged to face each other. Further, in the pair of the device 30 and the cooling fins 40 in which the V phase and the W phase are arranged adjacent to each other, the respective devices 30 are arranged so as to face each other, and the gate drive circuits 103V2D and 103W1D are arranged. They are arranged facing each other.

The W phase of the converter 102 and the U phase of the inverter 103 are arranged adjacent to each other, and in the pair of the device 30 and the cooling fins 40 arranged at positions adjacent to each other, the respective devices 30 face each other. The gate drive circuits 102W2D and 103U1D are arranged so as to face each other.

Further, the gate drive circuits 104-1D1, 104-1D2, 104-2D1 and 104-2D2 (chopper control unit (power conversion unit drive unit) 405) for driving each device 30 of the choppers 104-1 and 104-2 are provided. It is placed in the vicinity of the device 30 of.

The chopper 104 has a set of a device 30 and a cooling fin 40, and each of the choppers 104-1 and 104-2 has two sets. In the pair of the device 30 and the cooling fins 40 in which the choppers 104-1 and 104-2 are arranged adjacent to each other, the respective devices 30 are arranged to face each other and the gate drive circuit 104-1D2 and the gate drive circuit 104-1D2. 104-2D1 and 104-2D1 are arranged to face each other.

According to the third embodiment, the same effect as that of the second embodiment can be obtained, and the device 30 and its gate drive circuit (102U1D-102W1D, 103U1D-103W2D, 104-1D1-104-2D2) are arranged close to each other. Therefore, unnecessary resonance of the gate drive circuit can be suppressed, and the device 30 can be driven at high speed.

(Example 4)
Next, Example 4 of the present invention will be described.

The overall configuration of the power conversion device in the fourth embodiment is the same as the configuration shown in FIG. 1, and the internal configurations of the converter 102, the inverter 103, and the chopper 104 are the same as the configurations shown in FIGS. 3 to 5. , Illustrations and detailed description thereof will be omitted.

FIG. 11 is an explanatory diagram of the arrangement configuration in the fourth embodiment of the present invention.

In FIG. 11, the difference from the arrangement configuration of the third embodiment shown in FIG. 10 is that the wind direction plate 900 is arranged on the downstream side (leeward side) of the cooling air of the converter 102 and the inverter 103. The chopper 104 is arranged on the downstream side (leeward side) of the cooling air of the wind direction plate 900. An opening 900A is formed on the downstream side of the cooling fins 40 of the wind plate 900 converter 102 and the inverter 103. That is, the opening 900A is opened in the direction in which the cooling fins 40 of the converter 102 and the cooling fins 40 of the chopper 104 are arranged in series with respect to the cooling air.

FIG. 12 is an explanatory diagram of the arrangement of the wind direction plate 900 in the fourth embodiment.

FIG. 12A is a cross-sectional view taken along the line AA'of FIG. 11, and FIG. 12B is a schematic perspective view of the power conversion device according to the fourth embodiment.

As shown in FIGS. 12A and 12B, the wind direction plate 900 is formed so as to be substantially orthogonal to the substrate 1000 on which the converter 102, the inverter 103, the chopper 104, and the capacitor 600 are mounted. The opening 900A of the wind direction plate 900 is formed on the downstream side (leeward side) of the cooling fin 40.

The opening 900A other than the opening 900A shown in FIG. 12A is also formed on the downstream side (leeward side) of the cooling fin 40.

The wind direction plate 900 can equalize the amount of air flowing into the cooling fins 40 of the chopper 104 located on the leeward side of the converter 102 and the amount of air flowing into the cooling fins 40 of the converter 102 located on the leeward side of the chopper 104. It can improve the cooling effect.

According to the fourth embodiment, the same effect as that of the third embodiment can be obtained, and the above-mentioned effect can be obtained.

The material of the wind direction plate 900 is preferably resin because of the problem of insulating property.

(Example 5)
Next, Example 5 of the present invention will be described.

The overall configuration of the power conversion device in the fifth embodiment is the same as the configuration shown in FIG. 1, and the internal configurations of the converter 102, the inverter 103, and the chopper 104 are the same as the configurations shown in FIGS. 3 to 5. , Illustrations and detailed description thereof will be omitted.

FIG. 13 is an explanatory diagram of the arrangement configuration in the fifth embodiment of the present invention.

In FIG. 13, the difference from the arrangement configuration of the fourth embodiment shown in FIG. 11 is that the V-phase inverter 103V of the inverter 104 is leeward of the cooling air from the U-phase inverter 103U and the W-phase inverter 103W. It is placed on the side.

That is, the inverter 103V is arranged at a position offset with respect to the inverter 103U and the inverter 103W, and is arranged in a staggered manner as the entire inverter 103.

The opening 900A of the wind direction plate 900 is formed so as to open from the cooling fin 40 of the inverter 103U to the cooling fin 40 of the inverter 103V and the cooling fin 40 of the inverter 103W.

By arranging the inverters 103 in a staggered manner, the distance between the inverter 103U and the inverter 103W can be narrowed, the widthwise dimension of the entire power conversion device 100 can be reduced, and the size can be reduced.

According to the fifth embodiment, the same effect as that of the fourth embodiment can be obtained, and the above-mentioned effect can be obtained.

(Example 6)
Next, Example 6 of the present invention will be described.

FIG. 14 is a diagram showing a circuit configuration of a sixth embodiment of the present invention. Compared with the circuit configuration of the first embodiment shown in FIG. 7, the DC link capacitors 600 of FIG. 7 are two capacitors 601 and 602 connected in series to each other, and the connection points between the capacitors 601 and 602 are on the AC power supply side. Capacitor 2000 (second AC filter capacitor) connected to the R, S, T terminals and the output side (load 108 side) of the inverter 103 via the capacitor 2100 (first AC filter capacitor) connected to It is connected to the U, V, and W terminals via an AC filter capacitor). The connection points between the capacitors 601 and 602 are connected to the capacitors 2000 and 2100, and have an intermediate potential of 4000. Further, the reactor 406A is connected to the connection midpoint between the upper arm switching element 104-1B and the lower arm switching element 104-2B of the chopper 104, and the connection between the upper arm switching element 104-1A and the lower arm switching element 104-2A. Reactor 406B is connected to the midpoint.

With the circuit configuration shown in FIG. 14, the withstand voltage specifications of the AC filter capacitors 2000 and 2001 can be relaxed, and the power conversion device as a whole can be miniaturized.

FIG. 15 is a diagram showing an example of a wiring layout in the circuit configuration shown in FIG.

The wiring example shown in FIG. 15 is an L1 layer (AC wiring of the converter 102 and the inverter 103), an L2 layer (P pole wiring), an L3 layer (N pole wiring), and an L4 layer (AC wiring of the chopper 104, intermediate). It has a multi-layered structure (intermediate electrode wiring with a potential of 4000).

As shown in FIG. 15A, wirings 1021, 1022, and 1023 of the converter 102 are formed in the L1 layer. Further, AC wiring 1031, 1032, 1033 of the inverter 103 is formed.

Further, as shown in FIG. 15B, the P pole wiring 3000P is formed in the L2 layer.

Further, as shown in FIG. 15 (C), N-pole wiring 2000N is formed in the L3 layer.

Further, as shown in FIG. 15 (D), the chopper AC wirings 1041 and 1042 are formed and the intermediate potential wiring 4000L is formed in the L4 layer.

FIG. 16 is a cross-sectional view taken along the line BB'of FIG.

In FIG. 16, the gate drive wiring 5000GL4 and the AC intermediate potential wiring 5000ML4 are formed in the L4 layer, and the gate drive wiring 5000GL3 and the N pole wiring 5000ML3 are formed in the L3 layer.

Further, the L2 layer is formed with the gate drive wiring 5000GL2 and the P pole wiring 5000ML2, and the L1 layer is formed with the gate drive wiring 5000GL1 and the AC wiring 5000ML1.

An insulating layer 5000I is arranged between the layers to insulate each other. Further, a via 6200 is formed through the L1 layer to the L4 layer, and a lead 6100 is arranged in the via 6200. Above the L1 layer, a lower arm device 30L and an upper arm device 30H connected to the lead 6100 are connected. Further, a gate drive IC 6000 is arranged above the gate drive wiring 5000GL1 of the L1 layer.

With the above configuration, the gate drive wiring 5000G and the main circuit wiring 5000M can be separated in the layer direction to reduce noise. Further, by forming the main circuit wiring 5000M into a multi-layer wiring structure (laminated wiring structure), it is possible to reduce the inductance and suppress the jumping of the main circuit voltage due to the switching operation.

Further, the AC wiring 5000ML1 can be arranged in the L1 layer which is the surface layer or the L4 layer which is the lowest layer to reduce the temperature rise and perform high-efficiency cooling.

According to the sixth embodiment, the same effect as that of the fifth embodiment can be obtained, and the above-mentioned effect can be obtained.

The multilayer structure of Example 6 is also applicable to Examples 1 to 5.

(Example 7)
Next, Example 7 of the present invention will be described.

The overall configuration of the power conversion device in the seventh embodiment is the same as the configuration shown in FIG. 1, and the internal configurations of the converter 102, the inverter 103, and the chopper 104 are the same as the configurations shown in FIGS. 3 to 5. , Illustrations and detailed description thereof will be omitted.

FIG. 17 is an explanatory diagram of an arrangement configuration according to a seventh embodiment of the present invention.

The example shown in FIG. 17 is the same as the figure in which the DCAC reactor 800 and the DC link capacitor 600 are omitted from the fifth embodiment shown in FIG. 13, but the converter 102 is shown in FIG. The devices 30 facing each other are both lower arm devices 30L. Similarly, the devices 30 facing each other of the chopper 104 are both lower arm devices 30L.

With this configuration, the insulation distance of the gate drive circuit wiring of each lower arm device 30L can be shortened, and high-density mounting becomes possible.

According to the seventh embodiment of the present invention, the same effects as those of the fifth embodiment can be obtained, and the above-mentioned effects can be obtained.

(Example 8)
Next, Example 8 of the present invention will be described.

The overall configuration of the power conversion device in the eighth embodiment is the same as the configuration shown in FIG. 1, and the internal configurations of the converter 102, the inverter 103, and the chopper 104 are the same as the configurations shown in FIGS. 3 to 5. , Illustrations and detailed description thereof will be omitted.

FIG. 18 is an explanatory diagram of the arrangement configuration in the eighth embodiment of the present invention.

In FIG. 18, the difference from the arrangement configuration of the fifth embodiment shown in FIG. 13 is that the arrangement positions of the capacitors 600A to 600J of the DC link capacitor 600 are staggered arrangement or offset arrangement.

That is, the capacitors 600A and 600B are arranged so that the line connecting the center points thereof is inclined with respect to the wind direction Wi. Further, the capacitors 600C and 600D, the capacitors 600E and 600F, the capacitors 600G and 600H, and the capacitors 600I and 600J have the same arrangement relationship as the capacitors 600A and 600B.

By configuring the DC link capacitor 600 as described above, it is possible to secure a space between the capacitor 600 and the cooling fins 40, reduce pressure loss, and improve the cooling effect.

According to the eighth embodiment of the present invention, the same effects as those of the fifth embodiment can be obtained, and the above-mentioned effects can be obtained.

(Example 9)
Next, Example 9 of the present invention will be described.

The overall configuration of the power conversion device in the ninth embodiment is the same as the configuration shown in FIG. 1, and the internal configurations of the converter 102, the inverter 103, and the chopper 104 are the same as the configurations shown in FIGS. 3 to 5. , Illustrations and detailed description thereof will be omitted.

FIG. 19 is a schematic external perspective view of the power conversion device according to the ninth embodiment of the present invention.

In FIG. 19, a capacitor 600, a converter 102, an inverter 103, and a chopper 104 are arranged on a main circuit board 100B, and reactors 406, 500, and 700 having a large weight are arranged on a reactor board 800B. These capacitors 600, converter 102, inverter 103, chopper 104, reactor 406,500,700 is covered by a housing 120, a cooling fan 110 in the rear wall of the housing 120 is disposed. The front of the housing 120 is open.

According to the ninth embodiment, the main circuit board 100B and the reactor board 800B are divided into two, and the reactors 406, 500, and 700 having a large weight are arranged on the reactor board 800B, so that the board is deflected. Can be prevented.

According to Example 9, in addition to the effects of Examples 1 to 8, the above-mentioned effects can also be obtained.

In the above example, the converter 102 is arranged on the upstream side (windward side) of the chopper 104 with respect to the cooling air Wi, but the chopper 104 is located on the upstream side of the converter 102 with respect to the cooling air Wi. It is also possible to arrange it on the (windward side).

Further, the above-mentioned example is an example in which the present invention is applied to a non-disruptive power conversion device, but is not limited to the non-disruptive power conversion device, and is used, for example, in a general-purpose inverter system, an elevator system, a solar power generation system, or the like. It can be applied to a power conversion device having a plurality of operating states, such as a power conversion device to be used.

When applied to a photovoltaic power generation system, the chopper 104 and the inverter 103 are driven when the photovoltaic power generation is possible during the daytime, and the converter 102 and the inverter are driven when the photovoltaic power generation is not possible at night. 103 and is driven.

Further, the above-mentioned example is an example including a converter 102, an inverter 103, and a chopper 104. The present invention also applies to a power conversion device including a converter 102 and a chopper 104 but omitting the inverter 103. It is possible.

That is, by the converter 102 to the commercial power, converts the DC power is supplied to the load that consumes DC power, the DC power of the battery 107 is converted by a chopper 104, a power conversion device for supplying a load that consumes DC power The present invention is also applicable.

In this case, the first power conversion unit becomes the converter 102 and the second power conversion unit chopper 104.

21 ... Upper arm switching element, 22 ... Lower arm switching element, 23 ... Upper arm rectifying element, 24 ... Lower arm rectifying element, 25, 26, 600, 601 and 602, 2000, 2100 ... Condenser, 30 ... Power device, 30H ... Upper arm device, 30L ... Lower arm device, 40 ... Cooling fin, 100 ... Power converter, 100B ... Main circuit board, 102 ... Converter, 103 ... Inverter, 104 ... Chopper, 105 ... Upper control circuit, 106 ... Commercial power supply, 107 ... Storage battery, 108 ... Load, 110 ... Cooling fan, 120 ... Housing, 201, 202, 203, 301, 302, 303 ... Half bridge circuit, 204 ... Converter control unit, 304 ... Inverter control unit, 405 ...・ Chopper control unit, 406, 500, 700, 800 ... reactor, 800B ... reactor board, 900 ... wind direction plate, 900A ... opening, 1000 ... board, 1021, 1022, 1023, 1031, 1032, 1033, 1041, 1042 ... Wiring, 2000N ... N pole, 3000P ... P pole, 4000L ... Intermediate potential wiring, 5000GL1-5000GL4 ... Gate drive wiring, 5000ML1 ... AC wiring, 5000ML2 ... P pole wiring, 5000ML3 ... N pole wiring, 5000ML4 ... AC intermediate potential wiring, 6000 ... Gate drive IC, 6100 ... Lead, 6200 ... Via, Wi.・ ・ Wind direction

Claims (10)

The first power converter and
The first cooling fin that cools the first power conversion unit,
The second power converter and
The second cooling fin that cools the second power conversion unit,
A cooling device that generates cooling air and
It has at least a first operating state and a second operating state, and in the first operating state, the calorific value of the first power conversion unit is larger than the calorific value of the second power conversion unit. In the second operating state, the calorific value of the first power conversion unit is smaller than the calorific value of the second power conversion unit, and a part of the first cooling fin and the second The cooling fins of the above are arranged in series with each other with respect to the wind direction of the cooling air generated by the cooling device.
The first power conversion unit has a converter that converts the AC power of the AC power supply into DC power, and the second power conversion unit has a chopper that converts the DC power of the DC power supply into a predetermined DC power. At least, the cooling fins of the converter and the cooling fins of the chopper are arranged in series with each other with respect to the wind direction of the cooling air generated by the cooling device.
The converter is a three-phase converter composed of U-phase, V-phase, and W-phase, which is arranged on the wind side of the chopper with respect to the cooling air, and is a first U-phase power device and the first U-phase. A first U-phase gate drive circuit that is located near the U-phase power device and drives the first U-phase power device, and near the first V-phase power device and the first V-phase power device. It is arranged in the vicinity of the first V-phase gate drive circuit for driving the first V-phase power device, the first W-phase power device, and the first W-phase power device, and is arranged in the vicinity of the first W-phase power device. It has a first W-phase gate drive circuit for driving the W-phase power device, and the first U-phase gate drive circuit and the first V-phase gate drive circuit are arranged so as to face each other. A power conversion device characterized in that the first V-phase gate drive circuit and the first W-phase gate drive circuit are arranged so as to face each other. In the power conversion device according to claim 1,
The inverter includes an inverter that converts the DC power converted by the converter and the DC power converted by the chopper into AC power, the inverter has cooling fins, and the cooling fins of the converter and the cooling fins of the inverter are the cooling device. Are arranged in parallel with each other with respect to the wind direction of the above cooling air where
The inverter is a three-phase inverter composed of a U phase, a V phase, and a W phase, and is arranged in the vicinity of the second U phase power device and the second U phase power device, and the second U phase power. A second U-phase gate drive circuit for driving the device, and a second V arranged in the vicinity of the second V-phase power device and the second V-phase power device to drive the second V-phase power device. It has a phase gate drive circuit and a second W-phase gate drive circuit that is arranged in the vicinity of the second W-phase power device and the second W-phase power device and drives the second W-phase power device. The second U-phase gate drive circuit and the second V-phase gate drive circuit are arranged so as to face each other, and the second V-phase gate drive circuit and the second W-phase gate drive circuit are arranged. Is a power conversion device characterized by being arranged facing each other. In the power conversion device according to claim 2,
A DC link capacitor connected to the converter and the inverter, and a reactor are provided. The DC link capacitor is arranged on the wind side of the converter with respect to the cooling air, and the reactor is arranged with respect to the cooling air. A power conversion device characterized by being arranged on the leeward side of the chopper. In the power conversion device according to claim 2,
A wind direction plate having an opening between the converter and the chopper is provided, and the opening is arranged such that the cooling fins of the converter and the cooling fins of the chopper are arranged in series with respect to the wind direction of the cooling air. A power converter characterized by being open in the direction in which it is formed. In the power conversion device according to claim 4,
A power conversion characterized in that a part of the plurality of power devices and the plurality of gate drive circuits of the inverter is offset with respect to the other power devices of the inverter and the gate drive circuit. Device. In the power conversion device according to claim 3,
Two AC filter capacitors connected to the AC power supply of the converter and a second AC filter capacitor connected to the output side of the inverter are provided, and the DC link capacitors are connected in series with each other. A power conversion device, which is a capacitor, wherein a connection point between these two capacitors and the first AC filter capacitor and the second AC filter capacitor are connected to each other. In the power conversion device according to claim 6,
A power conversion device characterized in that the wiring of the converter and the inverter, the wiring of the chopper, the intermediate electrode wiring, the positive electrode wiring, and the N wiring are composed of multi-layer wiring. In the power conversion device according to claim 3,
A power conversion device characterized in that, in each of the converter and the chopper, some lower arm devices among the plurality of power devices are arranged so as to face each other. In the power conversion device according to claim 3,
The DC link capacitor has a plurality of capacitors, and the plurality of capacitors are staggered. In the power conversion device according to claim 3 or 9.
A power conversion device characterized in that the DC link capacitor, the converter, and the chopper are mounted on a main circuit board, and the reactor is mounted on a reactor board.

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