JP2002044963A - Power converter for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a proper current balance of parallel-connected semiconductor switching elements having high reliability, which ensures sufficient voltage margin. SOLUTION: A semiconductor-switching element 1, that corresponds to one phase of an inverter circuit or a converter circuit, is mounted to the surface of a cooler block 6, two parallel-connected semiconductor switching elements 1 are so mounted as to be symmetric with respect to a clamp diode element 2, and a phase capacitor 3 is mounted directly on each terminal section of a first-group semiconductor switching element 1 and a fourth-group semiconductor switching element 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular power converter comprising semiconductor switching elements, and more particularly to a vehicular power converter having improved electric performance.

[0002]

2. Description of the Related Art Recently, as one of power conversion devices for vehicles,
2. Description of the Related Art A vehicle power conversion device including a semiconductor switching element has been widely used.

FIG. 9 is a circuit diagram showing an example of a main circuit configuration for one phase of a converter / inverter circuit of this type of vehicle power converter.

In FIG. 9, a semiconductor switching element 1
Are connected in parallel here, and are modular
1GBT is used.

In addition, it comprises a clamp diode element 2, a phase capacitor 3, and a snubber circuit 4 having an outer shape equivalent to that of the module type 1GBT.

FIG. 10 is a longitudinal sectional view showing a configuration example of a conventional vehicle power converter, FIG. 11 is a plan view showing an example of an element mounting configuration on a cooler block of the conventional vehicle power converter, and FIG. FIG. 13 is a perspective view of FIG.

As shown in FIGS. 10 to 13, semiconductor switching elements 1 (Q1a to Q4a and Q1b to Q4b) are mounted side by side on a cooler block (hereinafter referred to as a cooler block) 6. Clamp diode element 2 (D1a ・ D1b ・
D2a and D2b) are arranged side by side, and the elements are mounted in 3 × 4 as a whole.

[0008] The phase capacitor 3 is mounted immediately above the terminal of the clamp diode element 2.

The wiring loop of the phase capacitor 3 near the semiconductor switching elements Q1a and Q1b
1a and Q1b, clamp diode elements D1a and D1b, phase capacitors (connected in parallel in this case) 3, and conductors 20a, 20b, and 20c.

The conductor 20a is connected to the semiconductor switching element Q1a.
It is connected to the collector side terminal of Q1b and one terminal of the phase capacitor 3.

The conductor 20b is connected to the other terminal of the phase capacitor 3 and the anodes of the clamp diode elements D1a and D1b in the part related to the main wiring loop.

The conductor 20c is connected to the cathode side of the clamp diode elements D1a and D1b and the emitter side terminals of the semiconductor switching elements Q1a and Q1b in a part related to the main wiring loop.

By such a connection, a wiring loop of the semiconductor switching elements Q1a and Q1b, the phase capacitor 3, the clamp diode elements D1a and D1b, and the semiconductor switching elements Q1a and Q1b is formed.

In this case, two semiconductor switching elements
Q1a and Q1b, the phase capacitor 3 connected in parallel, the distance between the two clamp diode elements D1a and D1b are imbalanced, for example, in the semiconductor switching elements Q1a and Q1b, the distance to the phase capacitor 3 is different, Similarly, the distance to the phase capacitor 3 differs between the clamp diode elements D1a and D1b.

Further, the length of the wiring loop is configured to be short in the semiconductor switching element Q1b to the phase capacitor 3 to the clamp diode element D1a, but the semiconductor switching element Q1a to the phase capacitor 3 to the clamp diode element D1b.
The wiring loop is longer.

Similarly, the semiconductor switching elements Q4a and Q4b
In the wiring loop of the phase capacitor 3 in the vicinity of the above, the balance of the semiconductor switching elements connected in two parallels is poor, and the wiring loop length may be long.

The snubber circuit 4 includes a semiconductor switching element Q
The four snubber circuits are mounted on the terminal portions of 2a and Q3a and Q2b and Q3b so that the distance between the snubber circuits 4 is minimized.

This snubber circuit comprises a semiconductor switching element Q2a / Q2b and Q3a / Q3b and a snubber circuit (Q2a / Q2b side and Q3a / Q2b side).
3a and Q3b side), a conductor 20c, a conductor 20d, and a conductor 20e.

The conductor 20c is connected to the collector side terminals of the semiconductor switching elements Q2a and Q2b and one terminal of the two sets of snubber circuits 4 in the part related to this wiring loop.

The conductor 20d is connected to the emitter-side terminals of the semiconductor switching elements Q2a and Q2b and the collector-side terminals of the semiconductor switching elements Q3a and Q3b in the part related to the main wiring loop.

The conductor 20e is connected to the emitter-side terminals of the semiconductor switching elements Q3a and Q3b and the other terminals of the two sets of snubber circuits 4 in the part related to the main wiring loop.

By such a connection, a wiring loop of the semiconductor switching elements Q2a and Q2b to the snubber circuit 4 to the semiconductor switching elements Q3a and Q3b to Q2a and Q2b is formed.

In this case, the distance and the interval between the two snubber circuits 4 are configured to be minimum, but the wiring loop length is not shortest because the snubber circuits 4 are close to each other. Have been.

In the power converter for a vehicle, a partition plate 7 to which a cooler block 6 is attached is provided in the converter.
It is partitioned into a closed part 8a and an open part 8b.

A duct is formed on the side of the open portion 8b so as to surround the cooler radiator 9, and a cooling fan 11 sends cooling air 11 into the duct, and the cooling air 11 performs cooling.

[0026]

By the way, in the conventional vehicle power converter having such a configuration, since the two-parallel semiconductor switching elements 1 are mounted adjacent to each other, conductors for parallel connection are provided. This is advantageous in that the configuration is easy.

However, on the other hand, considering the clamp diode element 2 and the phase capacitor 3, the wiring loop 12 of the phase capacitor 3 includes the semiconductor switching elements Q1a and Q1b, the clamp diode element 2 and the phase capacitor 3
Wiring loop and semiconductor switching elements Q4a / Q4b
The wiring loop between the clamp diode element 2 and the phase capacitor 3 is not minimized, and the balance is poor.

With respect to the wiring loop 13 of the snubber circuit, the wiring loop of the semiconductor switching elements Q2a and Q3a and the snubber circuit 4 and the wiring loop of the semiconductor switching elements Q2b and Q3b and the snubber circuit 4 have the minimum wiring loops. Not.

Therefore, in both cases, the circuit inductance is large and the surge voltage at the time of switching becomes high.

Therefore, a sufficient margin cannot be secured for the allowable voltage of the semiconductor switching element 1.

Further, since the mounting position of the clamp diode element 2 is not symmetrical with respect to the semiconductor switching element 1, there is a problem that the current balance of the semiconductor switching elements 1 connected in parallel is poor, and the life of the semiconductor switching element 1 is reduced. It is disadvantageous in terms of reliability.

An object of the present invention is to provide a power converter for a vehicle, which secures a sufficient voltage margin, has high reliability, and has a good current balance of semiconductor switching elements connected in parallel.

[0033]

In order to achieve the above object, according to the invention corresponding to claim 1, four sets of semiconductor switching elements of a first set to a fourth set each connected in parallel are provided. Terminals (PN) connected in series, both ends of which are connected to a DC power supply (during inverter operation) or a DC output (during converter operation). The terminals of the second set of semiconductor switching elements and the third set of semiconductor switching elements are connected. An intermediate point is an AC output terminal (during inverter operation) or an AC input terminal (during converter operation), an intermediate point between the first set of semiconductor switching elements and the second set of semiconductor switching elements, and a third set of semiconductor switching elements. An intermediate point of the fourth set of semiconductor switching elements is connected to two sets of clamp diode elements connected in series in the opposite direction to the semiconductor switching elements, and the two sets of direct currents are connected. The intermediate point of the connected clamp diode elements is a terminal (C) connected to the neutral point of the DC power supply (when the inverter is operating) or the DC output (when the converter is operating), and two sets of the series connected clamp diode elements are connected. A terminal (P •) connected to the midpoint and a DC power supply (during inverter operation) or a DC output (during converter operation)
N) connecting a phase capacitor between each of them, and an intermediate point between the first set of semiconductor switching elements and the second set of semiconductor switching elements, and an intermediate point between the third set of semiconductor switching elements and the fourth set of semiconductor switching elements. A snubber circuit connected in series is connected between the two points, and an intermediate point between the two snubber circuits connected in series is connected to a DC power supply (during inverter operation) or a DC output (during converter operation). A semiconductor switching element for one phase of an inverter or a converter circuit, which is connected to a terminal (C) connected to a characteristic point, is mounted on a block surface of a cooler, and two semiconductor switching elements connected in parallel are provided. , Mounted symmetrically with respect to the clamp diode element, and directly above the terminal of each of the first set of semiconductor switching elements and the fourth set of semiconductor switching elements. , Implements the phase capacitor.

Therefore, in the vehicle power converter according to the first aspect of the present invention, the semiconductor switching element and the clamp diode element and the phase capacitor, and the semiconductor switching element and the snubber circuit are mounted so that the circuit inductances thereof are reduced. Further, the semiconductor switching element is mounted on the cooler block so as to be symmetrical with respect to the clamp diode element, and a phase capacitor is mounted immediately above the terminal of each of the first set of semiconductor switching elements and the fourth set of semiconductor switching elements. Thus, a sufficient voltage margin can be secured, the reliability is high, and the current balance of the semiconductor switching elements connected in parallel can be improved.

Further, in the invention corresponding to claim 2, four sets of semiconductor switching elements of a first set to a fourth set, each of which is connected two in parallel, are connected in series, and both ends thereof are connected to a DC power supply (when the inverter operates). ) Or a terminal (PN) connected to a DC output (during converter operation), and an intermediate point between the second set of semiconductor switching elements and the third set of semiconductor switching elements is an AC output terminal (during inverter operation) or AC. At an input terminal (during converter operation), an intermediate point between the first set of semiconductor switching elements and the second set of semiconductor switching elements, and an intermediate point between the third set of semiconductor switching elements and the fourth set of semiconductor switching elements, Two sets of clamp diode elements are connected in series in the opposite direction to the semiconductor switching element, and two sets of clamp diode elements are connected in series. The point is a terminal (C) connected to the neutral point of the DC power supply (during inverter operation) or the DC output (during converter operation), and the intermediate point between two sets of series-connected clamp diode elements and the DC power supply (inverter) A phase capacitor is connected between each of the terminals (P and N) connected to a DC output (during operation) or a DC output (during a converter operation), and an intermediate point between the first set of semiconductor switching elements and the second set of semiconductor switching elements. And two snubber circuits connected in series between the third set of semiconductor switching elements and an intermediate point of the fourth set of semiconductor switching elements,
Inverter or converter circuit 1 in which an intermediate point of the snubber circuits connected in series is connected to a terminal (C) connected to a neutral point of DC power supply (during inverter operation) or DC output (during converter operation). A semiconductor switching element for each phase is mounted on the block surface of the cooler,
The semiconductor switching elements connected in parallel are arranged, and the two sets of the two semiconductor switching elements connected in parallel are mounted so as to sandwich the clamp diode element.
A phase capacitor is mounted immediately above the terminal of each of the semiconductor switching element of the set and the semiconductor switching element of the fourth set.

Therefore, in the vehicle power converter according to the second aspect of the present invention, the semiconductor switching element and the clamp diode element / phase capacitor are mounted so that the circuit inductance of the semiconductor switching element and the snubber circuit is reduced. Furthermore, the semiconductor switching element is mounted on the cooler block so as to sandwich the clamp diode element by itself, and a phase capacitor is mounted immediately above each terminal of the first set of semiconductor switching elements and the fourth set of semiconductor switching elements. Accordingly, a sufficient voltage margin can be ensured, the reliability is high, and the current balance of the semiconductor switching elements connected in parallel can be improved. Further, since the element mounting is performed in three rows or two rows, it is possible to easily configure even a narrow portion such as in a locomotive.

According to a third aspect of the present invention, in the vehicle power converter according to the first or second aspect, the second set of semiconductor switching elements and the third set of semiconductor switching elements are further provided. Two snubber circuits connected in series are mounted immediately above each terminal.

Therefore, in the vehicle power converter according to the third aspect of the present invention, by mounting the snubber circuit directly above the terminal of the semiconductor switching element, the circuit inductance is further reduced, and the power consumption at the time of interruption is reduced. The surge voltage decreases, and a sufficient voltage margin with respect to the allowable voltage of the semiconductor switching element can be secured.

[0039]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a longitudinal sectional view showing a configuration example of a vehicle power converter according to the present embodiment, and FIG. 2 is a cooler block of the vehicle power converter according to the present embodiment. FIG. 3 is a plan view showing an example of the above-mentioned element mounting configuration, FIG. 3 is a view in the direction of arrow A in FIG. 2, and FIG. 4 is a perspective view of FIG.
The same elements as those in FIGS. 10 to 13 are denoted by the same reference numerals and description thereof will be omitted. Only different parts will be described here.

That is, as shown in FIGS. 1 to 4, the vehicle power converter of the present embodiment is different from the conventional vehicle power converter in that a clamp diode element is provided.
2 are mounted in one row on the cooler block 6, and two semiconductor switching elements 1 connected in parallel are mounted on both sides thereof,
The elements are mounted in 4 rows x 3 columns.

Here, the semiconductor switching element 1 is mounted so as to be line-symmetric with respect to the clamp diode element 2.

Further, a phase capacitor 3 is mounted directly on the terminal of each of the first and fourth sets of semiconductor switching elements 1 (Q1a and Q1b and Q4a and Q4b).

Here, the semiconductor switching elements Q1a and Q1b
The wiring loop of the clamp diode element 2 and the phase capacitor 3 includes the semiconductor switching elements Q1a and Q1b and D1a and D1b, the phase capacitor 3 and the conductors 20f, 20g, and 20h.

The conductor 20f is connected to the semiconductor switching element Q1a.
Connected to the collector side terminal of Q1b and one terminal of phase capacitor 3.

The conductor 20g is connected to the other terminal of the phase capacitor 3 and the anode side of the semiconductor switching elements D1a and D1b in a part related to the present wiring loop.

The conductor 20h is connected to the cathode side of the semiconductor switching elements D1a and D1b and the emitter side terminals of the semiconductor switching elements Q1a and Q1b in the part related to the main wiring loop.

With such a connection, a wiring loop of the semiconductor switching elements Q1a and Q1b, the phase capacitor 3, the clamp diode elements D1a and D1b, and the semiconductor switching elements Q1a and Q1b is formed.

In this case, two semiconductor switching elements
Q1a and Q1b, two phase capacitors 3 connected in parallel
Since the clamp diode elements D1a and D1b are arranged so as to be line-symmetric with respect to the clamp diode elements D1a and D1b, the respective wiring loops have the same length.

Further, the length of the wiring loop can be minimized.

Similarly, the semiconductor switching elements Q4a and Q4b
Also, the wiring loops of the clamp diode element 2 and the phase capacitor 3 have the same wiring loop length.

Further, the length of the wiring loop can be minimized.

The two sets of snubber circuits 4 are mounted on the terminals of the semiconductor switching elements Q2a and Q3a and Q2b and Q3b, respectively.

Here, the mounting position is such that the center line of each of the two sets of snubber circuits 4 and the semiconductor switching element Q
It is mounted at a position where the center lines of 2a / Q3a and Q2b / Q3b match.

The snubber circuit 4 includes a set of semiconductor switching elements Q2a and Q3a, a snubber circuit (Q2a and Q3a side) and a conductor 20.
h, conductor 20i, and conductor 20j.The other pair consists of semiconductor switching elements Q2b and Q3b, a snubber circuit (Q2b and Q3b side), and a conductor.
It is composed of 20h, conductor 201, and conductor 20j.

The conductor 20h is connected to the collector side terminals of the semiconductor switching elements Q2a and Q2b and one terminal of the two sets of snubber circuits 4 at the part related to the main wiring loop.

The conductor 20i is connected to the emitter-side terminals of the semiconductor switching elements Q2a and Q2b and the C terminal of the semiconductor switching elements Q3a and Q3b where the wiring loop is concerned.

The conductor 20j is connected to the emitter-side terminals of the semiconductor switching elements Q3a and Q3b and the other terminals of the two sets of snubber circuits 4 where the wiring loop is concerned.

By such a connection, the semiconductor switching element Q2a to the snubber circuit 4 to the semiconductor switching element Q3
A wiring loop of two sets of snubber circuits 4 of a to Q2a and semiconductor switching element Q2b to snubber circuit 4 to semiconductor switching element Q3b to Q2b is formed.

In this case, the length of the two snubber circuits 4 is
Each of the two sets is configured to be the shortest.

Next, in the vehicular power converter according to the present embodiment configured as described above, the semiconductor switching element 1 and the clamp diode element 2 are connected to the cooler block.
By symmetrically arranging them on 6, the currents of the semiconductor switching elements 1 symmetrically arranged with the clamp diode element 2 interposed therebetween become equal.

Since the wiring loop of the phase capacitor 3 and the wiring loop of the snubber circuit 4 are mounted so as to be shortest, the surge voltage at the time of switching is also minimized.

As described above, in the vehicular power converter according to the present embodiment, the current balance of the semiconductor switching elements 1 connected in one or more parallel connections is improved, and the surge voltage during switching is minimized.

As a result, a sufficient voltage margin can be secured in the semiconductor switching element 1, and a highly reliable vehicle power converter can be obtained.

Further, since the mounting position of the snubber circuit 4 is located immediately above the terminal portion of the semiconductor switching element 1, the circuit inductance is further reduced, the surge voltage at the time of interruption is reduced, and the allowable voltage of the semiconductor switching element 1 is reduced. Thus, a sufficient voltage margin can be secured.

(Second Embodiment) FIG. 5 is a longitudinal sectional view showing a configuration example of a vehicle power converter according to the present embodiment, and FIG. 6 is a cooler block of the vehicle power converter according to the present embodiment. FIG. 7 is a plan view showing an example of the element mounting configuration above, FIG. 7 is a view in the direction of arrow A in FIG. 6, and FIG. 8 is a perspective view of FIG.
The same elements as those in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described here.

That is, as shown in FIGS. 5 to 8, the vehicle power converter of the present embodiment differs from the vehicle power converter of the embodiment of FIGS.
Four sets of semiconductor switching elements 1 connected in parallel are arranged in series, and a first set and a second set of semiconductor switching elements
1 (Q1a / Q1b and Q2a / Q2b) between clamp diode 2 (D1a
D1b) is replaced with the third and fourth semiconductor switching elements 1 (Q3a
・ Clamp diode 2 (D2a ・ D2) between Q3b and Q4a ・ Q4b)
b) is mounted, and the elements are mounted in 6 rows × 2 columns.

Here, the elements arranged in two rows are mounted symmetrically with respect to the center line.

Further, the first set of semiconductor switching elements 1 (Q
1a ・ Q1b), and the fourth semiconductor switching element 1 (Q
The phase capacitor 3 is mounted just above the terminal section of 4a ・ Q4b).

Here, the semiconductor switching elements Q1a and Q1b
The wiring loop of the clamp diode element 2 and the phase capacitor 3 includes the semiconductor switching elements Q1a and Q1b and D1a and D1b, the phase capacitor 3 and the conductors 20k, 201, and 20m.

The conductor 20k is connected to the semiconductor switching element Q1a.
Connected to the collector side terminal of Q1b and one terminal of phase capacitor 3.

The conductor 20l is connected to the other terminal of the phase capacitor 3 and the anode side of the semiconductor switching elements D1a and D1b where it is involved in this wiring loop.

The conductor 20m is connected to the cathodes of the semiconductor switching elements D1a and D1b and the emitter-side terminals of the semiconductor switching elements Q1a and Q1b where this wiring loop is concerned.

With such a connection, a wiring loop of the semiconductor switching elements Q1a and Q1b, the phase capacitor 3, the clamp diode elements D1a and D1b, and the semiconductor switching elements Q1a and Q1b is formed.

In this case, two semiconductor switching elements
Q1a and Q1b, two phase capacitors 3 connected in parallel
Since the elements are arranged so as to be line-symmetric with respect to the center line of the elements arranged in a row, the respective wiring loops have the same length.

Further, the length of the wiring loop can be minimized.

Similarly, the semiconductor switching elements Q4a and Q4b
Also, the wiring loops of the clamp diode element 2 and the phase capacitor 3 have the same wiring loop length.

Further, the length of the wiring loop can be minimized.

The two sets of snubber circuits 4 are mounted on the terminals of the semiconductor switching elements Q2a and Q3a and Q2b and Q3b, respectively.

Here, the mounting position is such that the center line of each of the two sets of snubber circuits 4 and the semiconductor switching element Q
It is mounted at a position where the center lines of 2a / Q3a and Q2b / Q3b match.

The snubber circuit 4 includes a set of semiconductor switching elements Q2a and Q3a, a snubber circuit (Q2a and Q3a side) and a conductor 20.
m, conductor 20n, conductor 20p, and the other set is a semiconductor switching element Q2b, Q3b, a snubber circuit (Q2b, Q3b side) and a conductor.
It is composed of 20m, conductor 20n, and conductor 20p.

The conductor 20m is connected to the collector side terminals of the semiconductor switching elements Q2a and Q2b and one terminal of the two sets of snubber circuits 4 in the part related to the main wiring loop.

The conductor 20n is connected to the emitter-side terminals of the semiconductor switching elements Q2a and Q2b and the C terminal of the semiconductor switching elements Q3a and Q3b where it is involved in this wiring loop.

The conductor 20p is connected to the emitter-side terminals of the semiconductor switching elements Q3a and Q3b and the other terminals of the two sets of snubber circuits 4 where the wiring loop is concerned.

By such a connection, the semiconductor switching element Q2a to the snubber circuit 4 to the semiconductor switching element Q3
A wiring loop of two sets of snubber circuits 4 of a to Q2a and semiconductor switching element Q2b to snubber circuit 4 to semiconductor switching element Q3b to Q2b is formed.

In this case, the length of the two snubber circuits 4 is
Each of the two sets is configured to be the shortest. Therefore, the surge voltage during switching is also minimized.

Next, in the vehicular power converter according to the present embodiment configured as described above, the semiconductor switching element 1 and the clamp diode element 2 are connected to the cooler block.
By arranging them side by side on 6, the currents of the semiconductor switching elements 1 symmetrically arranged with the clamp diode element 2 interposed therebetween become equal.

Further, since the wiring loop of the phase capacitor 3 and the wiring loop of the snubber circuit 4 are mounted so as to be shortest, the surge voltage during switching is also minimized.

As described above, also in the vehicle power converter according to the present embodiment, the current balance of the semiconductor switching elements 1 connected in one or more parallel connections is improved, and the surge voltage during switching is minimized.

As a result, a sufficient voltage margin can be secured in the semiconductor switching element 1, and an extremely reliable vehicle power converter can be obtained.

Further, since the mounting position of the snubber circuit 4 is located immediately above the terminal portion of the semiconductor switching element 1, the circuit inductance is further reduced, the surge voltage at the time of interruption is reduced, and the allowable voltage of the semiconductor switching element 1 is reduced. Thus, a sufficient voltage margin can be secured.

Further, since the element mounting is performed in three rows instead of three rows, it is possible to easily configure a narrow part such as in a locomotive, for example.

[0093]

As described above, according to the vehicular power converter of the present invention, the semiconductor switching element and the clamp diode element are arranged symmetrically on the cooler block. The current balance of the connected semiconductor switching elements is improved, which is advantageous in terms of the life and reliability of the semiconductor switching elements.

Further, since the mounting position of the phase capacitor / snubber circuit is set immediately above the terminal of the semiconductor switching element, the circuit inductance is reduced, the surge voltage at the time of interruption is reduced, and the allowable voltage of the semiconductor switching element is reduced. , A sufficient voltage margin can be secured.

As described above, the life and reliability of the semiconductor switching element are high, and a sufficient voltage margin is ensured, so that a highly reliable device can be constructed.

Further, the whole apparatus is made compact, and it is possible to reduce the size and weight.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a vehicle power converter according to the present invention.

FIG. 2 is a plan view showing an example of an element mounting configuration on a cooler block of the vehicle power converter according to the first embodiment.

FIG. 3 is a view in the direction of arrow A in FIG. 2;

FIG. 4 is a perspective view of FIG. 2;

FIG. 5 is a longitudinal sectional view showing a second embodiment of the vehicular power converter according to the present invention.

FIG. 6 is a plan view showing an example of an element mounting configuration on a cooler block of the vehicle power converter according to the second embodiment.

FIG. 7 is a view as seen in the direction of arrow A in FIG. 6;

FIG. 8 is a perspective view of FIG. 6;

FIG. 9 is a circuit diagram showing an example of a main circuit configuration for one phase of a converter / inverter circuit of the vehicle power converter.

FIG. 10 is a longitudinal sectional view showing a configuration example of a conventional vehicle power converter.

FIG. 11 is a plan view showing an example of an element mounting configuration on a cooler block of a conventional vehicle power converter.

FIG. 12 is a view as seen in the direction of arrow A in FIG. 11;

FIG. 13 is a perspective view of FIG. 11;

[Explanation of symbols]

 1 ... Semiconductor switching element 2 ... Clamp diode element 3 ... Phase capacitor 4 ... Snubber circuit 5 ... Gate amplifier board 6 ... Cooler block 7 ... Partition plate 8a ... Sealed part 8b ... Open part 9 ... Cooler radiator 10 ... Cooling fan 11… Cooling air 12… Phase capacitor wiring loop 13… Snubber circuit wiring loop 20a ～ 20p… Conductor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H007 AA01 AA03 AA06 CA01 CB04 CB05 CC04 CC06 CC07 CC14 CC23 FA01 FA13 FA20 HA03 HA04 HA06 5H740 BA11 BB01 BB05 BB09 MM10 MM18 NN17 PP01 PP02 PP04 PP06

Claims (3)

[Claims] 1. Four sets of semiconductor switching elements of a first set to a fourth set, each of which is connected two in parallel, are connected in series, and both ends thereof are a DC power supply (during inverter operation) or a DC output (during converter operation). (P ・
N), an intermediate point between the second set of semiconductor switching elements and the third set of semiconductor switching elements is an AC output terminal (during inverter operation) or an AC input terminal (during converter operation), and the first set of semiconductor switching elements. The intermediate point between the switching element and the second set of semiconductor switching elements, and the intermediate point between the third set of semiconductor switching elements and the fourth set of semiconductor switching elements, two sets in the opposite direction to the semiconductor switching element. Are connected by a clamp diode element connected in series, and an intermediate point between the two sets of clamp diode elements connected in series is connected to a neutral point of the DC power supply (inverter operation) or the DC output (converter operation). (C), and an intermediate point between the two sets of series-connected clamp diode elements and the DC power supply (when the inverter operates). Other DC output (during converter operation)
A phase capacitor is connected between each of the terminals (PN) connected to the first set of semiconductor switching elements, an intermediate point between the first set of semiconductor switching elements and the second set of semiconductor switching elements, and the third set of semiconductor switching elements. A two-series connected snubber circuit is connected between the element and an intermediate point of the fourth set of semiconductor switching elements, and an intermediate point of the two series-connected snubber circuits is connected to the DC power supply ( A semiconductor switching element for one phase of the inverter or converter circuit, which is connected to the terminal (C) connected to the neutral point of the inverter or the DC output (during the converter operation), is mounted on the block surface of the cooler. Wherein said two semiconductor switching elements connected in parallel are mounted symmetrically with respect to said clamp diode element; A power conversion device for a vehicle, comprising a phase capacitor mounted directly on a terminal of each of the switching element and the fourth set of semiconductor switching elements. 2. A first to a fourth set of four semiconductor switching elements, each connected two in parallel, are connected in series, and both ends thereof are a DC power supply (during inverter operation) or a DC output (during converter operation). (P ・
N), an intermediate point between the second set of semiconductor switching elements and the third set of semiconductor switching elements is an AC output terminal (during inverter operation) or an AC input terminal (during converter operation), and the first set of semiconductor switching elements. The intermediate point between the switching element and the second set of semiconductor switching elements, and the intermediate point between the third set of semiconductor switching elements and the fourth set of semiconductor switching elements, two sets in the opposite direction to the semiconductor switching element. Are connected by a clamp diode element connected in series, and an intermediate point between the two sets of clamp diode elements connected in series is connected to a neutral point of the DC power supply (inverter operation) or the DC output (converter operation). (C), and an intermediate point between the two sets of series-connected clamp diode elements and the DC power supply (when the inverter operates). Other DC output (during converter operation)
A phase capacitor is connected between each of the terminals (PN) connected to the first set of semiconductor switching elements, an intermediate point between the first set of semiconductor switching elements and the second set of semiconductor switching elements, and the third set of semiconductor switching elements. A two-series connected snubber circuit is connected between the element and an intermediate point of the fourth set of semiconductor switching elements, and an intermediate point of the two series-connected snubber circuits is connected to the DC power supply ( A semiconductor switching element for one phase of the inverter or converter circuit, which is connected to the terminal (C) connected to the neutral point of the inverter or the DC output (during the converter operation), is mounted on the block surface of the cooler. And the two semiconductor switching elements connected in parallel are arranged.
A semiconductor capacitor is mounted so as to sandwich the clamp diode element with the semiconductor switching elements connected in parallel, and a phase capacitor is mounted immediately above a terminal of each of the first set of semiconductor switching elements and the fourth set of semiconductor switching elements. A power conversion device for a vehicle, comprising: 3. The vehicular power converter according to claim 1, wherein the second set of semiconductor switching elements and the third set of semiconductor switching elements are connected in series directly above respective terminal portions. 2. The vehicle power converter according to claim 1, wherein the two snubber circuits are mounted.