JP5255869B2 - Power module - Google Patents

Description

  The present invention relates to a power module used for power conversion.

  In recent years, against the background of the development of electric vehicles and the like, power modules are increasingly required to have higher sophistication, higher power, and higher reliability. Some power modules integrate a power device chip and its control unit (for example, Patent Documents 1 to 4 and 9).

  A power conversion board on which a power conversion circuit such as an inverter circuit composed of semiconductor switching elements or the like is mounted is usually provided with a heat dissipation plate for heat dissipation. In recent years, a substrate in which a ceramic layer is bonded to an aluminum plate as described in Patent Document 5 is preferably used as a base of a power conversion substrate because of its excellent heat dissipation.

  In addition, as described in Patent Document 6, a shielding plate for shielding electromagnetic noise or the like is disposed between the power conversion board and a drive board on which a drive circuit that drives the power conversion circuit is mounted. Is done.

On the other hand, Patent Document 7 describes a power module in which a current transformer (CT) for detecting a three-phase current is provided for each of the three phases, and this is provided inside to reduce the size of the power module. . Since the current transformer has a ring structure surrounding a conducting wire through which a current flows, space is taken up. Therefore, it is estimated that it is difficult to efficiently arrange the three current transformers inside.
However, Patent Document 8 describes that a current transformer is provided in two of the three phases.

In Patent Document 9, an insulating metal substrate on which a power control semiconductor element is mounted and an integrated circuit board on which a control element for controlling the power control semiconductor element is mounted in a case in which connection terminals between the inside and the outside are embedded and held. Describes a power module arranged at a distance from top to bottom.
Japanese Patent Laid-Open No. 9-233853 JP 2002-027665 A JP 2003-125588 A JP 2004-304926 A JP 2004-115337 A JP-A-2-290099 JP-A-9-65662 JP 2006-184241 A JP 2007-134572 A

In addition to the above-described elements, in order to configure a power module at a higher level, a temperature detection element on a power conversion circuit, a control circuit that controls the drive circuit based on each detection value and a control command, and a detection value of a current transformer It is required to construct a path for feeding back to the control circuit, a communication circuit for transferring digital control information inputted from the outside, and the like.
Also, it is desired to efficiently arrange input / output terminals of power conversion circuits, wiring materials between substrates, wiring materials between semiconductor switching elements, and the like to form a compact and highly reliable power module.

  The present invention has been made in view of the above prior art, and includes a power conversion circuit, a drive circuit, a control circuit, a communication circuit, a temperature detection element, a current detection circuit, and the like that are integrated efficiently and in a compact manner. An object is to provide a highly reliable power module for high power use.

The invention according to claim 1 for solving the above-described problems is a heat sink in which a U-phase, V-phase, and W-phase three-phase bridge type power conversion circuit and a temperature detection element are mounted via an insulating material,
An electric circuit board disposed above the power conversion circuit;
An enclosing case in which one end is fixed to the heat sink in a quadrilateral frame shape surrounding the power conversion circuit and the electric circuit board;
An anode terminal and a cathode terminal of the power conversion circuit held on the first side of the outer case;
U-phase, V-phase, and W-phase terminals held on the second side opposite to the first side of the outer case;
A lid covering the opening at the other end of the outer case;
With
A drive circuit for driving the power conversion circuit, a drive circuit power supply device for supplying power to the electric circuit board, a control circuit for controlling the drive circuit, and digital control information inputted from the outside A communication circuit that provides the control circuit with a control target value according to the transmission / reception and the control information, a first current detection circuit that detects a current of any one of the three phases, and a current of another phase A second current detection circuit,
The control circuit has a predetermined waveform based on the control target value, a value obtained from the temperature detection element, and a value obtained from the current detection circuit in order to realize the operation of the power conversion circuit according to the control target value. A function of generating a control current and outputting it to the drive circuit;
The drive circuit amplifies converting the control current to have a function of outputting a driving current to the power conversion circuit,
The U-phase bridge part, the V-phase bridge part, and the W-phase bridge part of the power conversion circuit are arranged in a predetermined order along one direction along the first side part,
The U-phase, V-phase, and W-phase terminals are arranged in the predetermined order in the one direction,
A first opening, a second opening, and a third opening that surround each one of the bridge portions are unevenly distributed on the side of the first side, and are arranged in the one direction. Formed in the order of the first opening, the second opening, the third opening,
Electrical connection pins are erected and fixed to a portion between the first opening and the second opening and a portion between the second opening and the third opening of the outer casing, respectively, , all of the power conversion circuit and the driving circuit or a part of the electrical connection is a power module that has been made.

According to a second aspect of the invention, the first current transformer circuit is applied as a first current detection circuit, a second current transformer circuit is used as the second current detection circuit,
An inner space of the outer case between the first opening and the second side portion surrounds the conductor connecting between the bridge portion of any one of the three phases and the terminal in the same phase, and the conductor. The first current transformer circuit having a ring structure is arranged with the longitudinal direction of the conductor and the axial direction of the ring structure parallel to the second side part,
In the inner space of the outer case between the third opening and the second side portion, there is a conductor connecting the other one-phase bridge portion and the terminal in the same phase and a ring structure surrounding the conductor. The second current transformer circuit is arranged with the longitudinal direction of the conductor and the axial direction of the ring structure parallel to the second side part,
The power module according to claim 1 , wherein the first current transformer circuit and the second current transformer circuit are fixed to a back surface of the electric circuit board.

Third aspect of the present invention, the predetermined order is a power module according to claim 1, characterized in that in the order of U phase, V phase, W phase.

  According to the present invention, a power conversion circuit, a drive circuit, a control circuit, an external communication circuit, a temperature detection element, a current detection circuit, and the like are efficiently and compactly integrated, and are multifunctional and highly reliable for high power applications. A power module can be configured.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

FIG. 1 is a top view of a heat sink having an electrode pattern formed thereon. The heat sink a used in the power module according to the present embodiment is a metal plate such as aluminum. The heat sink a does not have a heat radiating fin. If necessary, the heat dissipating fins are attached separately. Of course, a heat radiating plate having heat radiating fins may be used.
As shown in FIG. 1, a plurality of fixing holes a <b> 1 are formed on the peripheral edge of the heat sink a.
Six ceramic layers buH, buL, bvH, bvL, bwH, bwL are bonded to one surface of the heat sink a. The two ceramic layers buH and buL serve as an insulating base in a region where a circuit constituting the U-phase bridge portion is mounted. Among them, the ceramic layer buH is an insulating base in a region where the semiconductor switching element connected to the anode side with respect to the U-phase output electrode is mounted, and the other ceramic layer buL is on the cathode side with respect to the U-phase output electrode. It is an insulation base of the area | region where the semiconductor switching element to be connected is mounted.
The same applies to the two ceramic layers bvH and bvL and the ceramic layers bwH and bwL for each of the V phase and the W phase.

  The electrode patterns of the respective phases are almost common, and representatively, reference numerals c1 to c4 of the electrode patterns are shown for the U phase. The anodes are connected in the order of c1, c2, c3, c4. On the ceramic layer bvH on the V layer anode side, the electrode pattern c3 has a shape cut out at the corner of the ceramic layer bvL, and a two-terminal electrode pattern c6 is formed in the region formed thereby. ing. A temperature detecting resistance element (thermistor) is mounted on the electrode pattern c6.

  An IGBT as a semiconductor switching element and an FWD (freewheel diode) connected in parallel to the IGBT are mounted on the electrode patterns c2 and c4. In FIG. 1, the bonding regions of these elements are indicated by hatching.

FIG. 2 is a top view of the outer case. FIG. 3 is a cross-sectional view taken along line CC shown in FIG. 2 (a), a cross-sectional view taken along line DD (b), and a cross-sectional view taken along line EE (c). FIG. 4 is a cross-sectional view (a) taken along line FF shown in FIG. 2 and a cross-sectional view (b) taken along line I-I. FIG. 5 is a cross-sectional view (b) taken along the line BB shown in FIG. 2 and a cross-sectional view (b) taken along the line H-H.
FIG. 6 is a rear view (a) and a top view (b) of the power module. FIG. 7 is a left side view (a), a right side view (b), and a front view (c). FIG. 8 is an assembled perspective view of the power module.

  As shown in FIGS. 2 to 5, the outer casing d used in the power module of the present embodiment has a quadrangular frame shape. As shown in FIG. 2, the first side 1 is the upper part in the figure, the second side 2 is the lower part in the figure, the third side 3 is the left part in the figure, and the fourth side part 4 is the right part in the figure. . A first opening d1, a second opening d2, and a third opening are formed at the inner bottom of the quadrangular frame-shaped peripheral wall including the first side 1, the second side 2, the third side 3, and the fourth side 4. A resin portion having d3 is formed continuously on the peripheral wall. The first opening d1, the second opening d2, and the third opening d3 are unevenly distributed on the first side 1 side.

The outer casing d is a resin molded product that is manufactured by filling and curing a resin in a molding die in which terminals are arranged at fixed positions, and burying and holding those terminals.
A pair of anode terminal Pu and cathode terminal Nu provided for the U phase is held on the first side 1 of the outer casing d. Similarly, a pair of anode terminal Pv and cathode terminal Nv provided for the V phase and a pair of anode terminal Pw and cathode terminal Nw provided for the W phase are held on the first side 1 of the outer casing d. ing.

An end portion of the anode or cathode terminal Pu (Pv, Pw, Nu, Nv, Nw) exposed to the outside of the outer casing d is an external terminal portion Pu1 (Pv1, Pw1, Nu1, Nv1, Nw1). An end portion exposed to the inside of the case d is an internal terminal portion Pu2 (Pv2, Pw2, Nu2, Nv2, Nw2).
The external terminal portion Pu1 (Pv1, Pw1, Nu1, Nv1, Nw1) and the internal terminal portion Pu2 (Pv2, Pw2, Nu2, Nv2, Nw2) are located at substantially the same position without being replaced with the reverse electrode along the first side portion 1. Is arranged.

These anode or cathode terminals Pu (Pv, Pw, Nu, Nv, Nw) are external terminal portions Pu1 (Pv1, Pw1, Nu1, Nv1, as representatively shown in FIGS. 3A and 3B). Nw1) and the internal terminal portion Pu2 (Pv2, Pw2, Nu2, Nv2, Nw2) are vertically arranged, and the external terminal portion Pu1 (Pv1, Pw1, Nu1) is bent in the opposite direction from the portion. , Nv1, Nw1) and the internal terminal portion Pu2 (Pv2, Pw2, Nu2, Nv2, Nw2) are horizontally arranged at different heights. The external terminal portion Pu1 (Pv1, Pw1, Nu1, Nv1, Nw1) is held by a protruding portion outside the first side portion 1.
The external terminal portion Pu1 (Pv1, Pw1) of the anode and the external terminal portion Nu1 (Nv1, Nw1) of the cathode are held different from each other (see FIG. 6A).

Now, a total of six electrical connection pins IuL and IuH are erected in the portion between the first opening d1 and the second opening d2 of the outer casing d, and the lower ends are buried and fixed in the outer casing. Yes.
In addition, a total of eight electrical connection pins I1, IvL, and IvH are erected in a portion between the second opening d2 and the third opening d3 of the outer casing d, and the lower ends are buried and fixed in the outer casing. Has been.
A total of six electrical connection pins IwL and IwH are erected in a portion adjacent to the third opening d3 of the fourth side portion 4 of the outer case d, and the lower ends are buried and fixed in the outer case.
As shown in FIG. 5B, the lower ends of these electrical connection pins IuL, IuH, I1, IvL, IvH, IwL, and IwH are bent in an L shape, and the upper surfaces thereof are exposed.

A U-phase output terminal U1, a V-phase output terminal V, and a W-phase output terminal W1 are held on the second side 2 of the outer casing d.
The middle V-phase output terminal V extends the inner terminal V1 at the inner end to the edge of the second opening d2. The lead-out conductors from the inside to the outside of the U-phase and W-phase are internal terminals held at the edges of the first opening d1 and the third opening d3 in addition to the external terminals U1 and W1 held at the second side 2. U2 and W2 and connection bars U3 and W3 (see FIG. 7) between the external terminals U1 and W1 and the internal terminals U2 and W2.
These terminals U1, V, W1, U2, and W2 are also formed in a crank shape whose ends are bent in opposite directions.

As shown in FIG. 6, the IGBT 5, the FWD 6, and the temperature detecting resistance element 8 are bonded to the heat radiating plate a. Further, the lower ends of the electrical connection pins IuL, IuH, I1, IvL, IvH, IwL, and IwH and the electrode pattern on the heat sink a are wire-bonded as shown. Further, the electrode patterns on the heat sink a are wire-bonded as shown.
The lower end of the outer casing d is fixed to the heat radiating plate a, and the electrode pattern on the heat radiating plate a and the surface electrodes of the IGBT 5 and FWD 6 and the internal terminals (parts) are wire-bonded as shown.
As a result, a U-phase bridge portion spanned between the anode and the cathode is formed in a region surrounded by the first opening d1. Similarly, a V-phase bridge portion spanned between the anode and the cathode is configured in a region surrounded by the second opening d2, and a W-phase bridge portion spanned between the anode and the cathode is configured in a region surrounded by the third opening d3. Is done.

Furthermore, as shown in FIG. 7, the electric circuit board g is mounted inside the outer case d. At this time, the upper ends of the electrical connection pins IuL, IuH, I1, IvL, IvH, IwL, and IwH are inserted into the electrode holes (see FIG. 9) of the electric circuit board g and soldered.
As shown in FIGS. 6 and 7, a gap is provided over the entire circumference between the end surface of the peripheral edge of the electric circuit board g and the inner surface of the outer casing d facing the end surface.
As a result, the electric circuit board g is restrained only by the electric connection pins IuL, IuH, I1, IvL, IvH, IwL, and IwH that are erected and fixed to the surrounding case d with respect to the surface direction. For this reason, when the electric circuit board g tries to expand and contract due to a temperature change, the deformation is relatively free, so that undesirable deformation and destruction can be prevented.
The electrical connection pins IuL, IuH, I1, IvL, IvH, IwL, and IwH establish electrical connection between the power conversion circuit on the heat sink a and the drive circuit on the electric circuit board g.

Further, as shown in FIG. 7, a lid m covers the other end opening (opening opposite to the heat dissipation plate a) of the outer casing d.
As shown in FIG. 6, pedestal portions f1 to f13 on which the electric circuit board g is placed are formed in the outer case d. As shown in FIG. 7, on the back of the lid m, convex portions m1 to m13 (m5, 6, 11, 12, 13 are not shown) protruding downward correspond to the pedestal portions f1 to f13 on a one-to-one basis. Is formed.
This power module has a structure in which when the outer casing d is covered with a lid m, the electric circuit board g is held between the base parts f1 to f13 and the convex parts m1 to m13. Screw holes h1 to h13 are formed in the surrounding case d alongside the pedestals f1 to f13, and the lid m is fixed to the surrounding case d by screws screwed into the outside from the outside of the lid m. In addition, the electric circuit board g is sandwiched between the outer case d and the lid m.

On the back surface of the electric circuit board g, a U-phase current transformer circuit eu is fixed and mounted as a U-phase current detection circuit (before being incorporated into the outer case). Similarly, a W-phase current transformer circuit ew as a W-phase current detection circuit is fixed and mounted on the back surface of the electric circuit board g (before being incorporated into the outer case).
Both current transformer circuits eu and ew have a ring structure surrounding them in order to detect the current passing through the connection bars U3 and W3.
The lower end portion of the current transformer circuit eu (ew) is disposed in the recess d4 (d5) in the outer case d, and the connection bar inserted into the current transformer circuit eu (ew) as shown in FIG. One end of U3 (W3) is bolted to the inner end of U-phase output terminal U1 (W1), and the other end is bolted to the outer end of internal terminal U2 (W2).
As a result, as shown in FIGS. 6 and 7, the U-phase bridge portion and the U-phase terminal U1 are connected to the inner space of the outer casing d between the first opening d1 and the second side portion 2. A U-phase current transformer circuit eu having a connection bar U3 and a ring structure surrounding the connection bar U3 is arranged. The longitudinal direction of the connection bar U3 and the axial direction of the ring structure are arranged parallel to the second side portion 2.
Similarly, in the inner space of the outer casing d between the third opening d3 and the second side 2, a connection bar W3 that connects the W-phase bridge portion and the W-phase terminal W1 and a ring structure that surrounds the connection bar W3. A W-phase current transformer circuit ew having The longitudinal direction of the connection bar W3 and the axial direction of the ring structure are arranged in parallel with the second side portion 2.
The U-phase current transformer circuit eu detects a U-phase current flowing through the connection bar U3. The W-phase current transformer circuit ew detects a W-phase current flowing through the connection bar W3.

  As shown in FIG. 7, the electrical circuit board g is separately provided with a connector g1 for transmitting / receiving control information and a connector g2 for writing a control program to the control circuit. The connectors g1 and g2 are respectively fixed to the back surface of the electric circuit board g. The connector g1 is disposed at the right end portion of the electric circuit board g so as to open at the fourth side portion 4. On the other hand, the connector g2 is disposed at the left end of the electric circuit board g so as to open to the third side 3. Therefore, the third side portion 3 and the fourth side portion 4 are provided with openings at positions where the connectors are arranged.

  K shown in FIG. 7 is a shielding plate, which is disposed between the power conversion circuit on the heat radiating plate a and the electric circuit board g, and is held by a claw dk formed in the outer case d. In addition, the shielding board k is not illustrated in FIG.7 (c). The shielding plate k is made of aluminum, partitions the power conversion circuit and the electric circuit board g, and blocks electromagnetic noise and the like.

FIG. 9 is a plan view of the electric circuit board g and shows a block diagram of the mounted configuration.
As shown in FIG. 9, a drive circuit (IGBT gate driver or the like) for driving the power conversion circuit on the heat sink a is mounted in the region g3 of the electric circuit board g. The drive circuit power supply device u1 is mounted in the region g3. The region g3 includes a VPN voltage detection circuit (VPN) that detects a PN voltage, a VU voltage detection circuit (VU) that detects a U-phase voltage, and a VV voltage detection circuit (VV voltage detection circuit that detects a V-phase voltage). VV) and a VW voltage detection circuit (VW) for detecting the W-phase voltage.
In the region g4 of the electric circuit board g, a CPU u2, an A / D conversion circuit u3, and a PWM signal output circuit u4 are mounted. A control circuit that controls the drive circuit in the region g3 is configured by a CPU u2, an A / D conversion circuit u3, and a PWM signal output circuit u4.
A communication circuit that sends and receives digital control information input from the outside and gives a control target value according to the control information to the control circuit is configured in the CPUu2.
In FIG. 9, the connectors g1 and g2 are not shown.

FIG. 10 is a system block diagram of the power module.
Assume that the power conversion circuit is 10, the drive circuit and its power supply device is 11, the control circuit is 12, and the communication circuit is 13. The three-phase motor connected to this power module is assumed to be 9.
Each electrode of the three-phase motor 9 is connected to the aforementioned U-phase output terminal U1, V-phase output terminal V, and W-phase output terminal W1.
The power conversion circuit 10 is configured on the heat dissipation plate a described above.
On the electric circuit board g, a drive circuit and its power supply device 11, a control circuit 12, a communication circuit 13 are provided.
Is configured.
In addition, corresponding portions of the current detection circuits eu and ew, the voltage detection circuits VPN, VU, VV, and VW, the electrical connection pins I1, IuL, IuH, IvL, IvH, IwL, IwH, and the connectors g1 and g2 are denoted by the same reference numerals.

Next, functions and operations of the power module will be described with reference to FIG.
Here, it is assumed that the power motor of the parent device such as a mobile engine is a three-phase motor 9 and the power module is incorporated in the control system of the parent device.
The control information indicating the operation / stop command of the three-phase motor 9 and the target speed transmitted from the central part of the parent device is input to the communication circuit 13 by a digital signal described according to a predetermined protocol.
The communication circuit 13 gives a control target value according to the control information to the control circuit 12.
In order to realize the operation of the power conversion circuit 10 according to the control target value, the control circuit 12 detects the control target value, the value obtained from the temperature detection element 8, and the voltage detection circuits VPN, VU, VV, VW and current detection. Based on the values obtained from the circuits eu and ew, a control current having a predetermined waveform is generated by PWM modulation and output to the drive circuit 11.
That is, the control circuit 12 analyzes the temperature state of the power conversion circuit 10 from the value obtained from the temperature detection element 8 based on the control program set in the CPU u2, and detects the voltage detection circuits VPN, VU, VV, VW, and current. From the values obtained from the detection circuits eu and ew, the electrical state such as the output voltage and current of the power conversion circuit 10 is analyzed, and based on these pieces of information, a control current suitable for the control target value is determined and generated.
The control circuit 12 can analyze and recognize the rotational speed of the three-phase motor 9 from the values obtained from the current detection circuits eu and ew. The U-phase current, the V-phase current, and the W-phase current change in synchronization with the rotational phase of the three-phase motor 9, and change in the U-phase current and the W-phase current from the values obtained from the current detection circuits eu and ew. This is because the number of rotations of the three-phase motor 9 can be specified sufficiently. In addition, the control circuit 12 includes a rotation speed detection circuit corresponding to a motor having a sensor element (resolver or magnetic sensor) that detects the rotation speed and phase of the motor. The signal output line of the sensor element is connected to the control circuit 12 via the connector g1. The rotation speed detection circuit receives a signal from the sensor element and can analyze and recognize the rotation speed and phase of the three-phase motor 9 based on the signal.
By any one of the above methods, the control circuit 12 analyzes the rotation speed of the three-phase motor 9 and determines and generates a control current suitable for the control target value based on information including the rotation speed and also the phase. .
The drive circuit 11 amplifies and converts the control current and outputs a drive current to the power conversion circuit 10.
The control circuit 12 outputs information such as a failure and the temperature, voltage, current, etc. of the power conversion circuit 10 to the communication circuit 13, and the communication circuit 13 converts this into a digital signal according to the protocol and converts it to the parent device. Send to the central part.
Note that the method by which the control circuit 12 detects the rotation speed of the motor 9 is not limited to the above-described method, and various other methods can be used. For example, the rotational speed can be detected from two currents and one voltage.

  On the other hand, it is possible to write a control program to the control circuit 12 (full rewrite or partial rewrite) and a communication program to the communication circuit 13 (full rewrite or partial rewrite) via the connector g2. In addition, the written program can be read via the connector g2.

  As described above, the power module of the present embodiment is configured, and thereby, a power conversion circuit, a drive circuit, a control circuit, an external communication circuit, a temperature detection element, a current detection circuit, a voltage detection circuit, a rotation speed detection circuit, and the like. Can be efficiently and compactly integrated to achieve a highly functional and highly reliable power module for high power applications.

It is a top view of the heat sink which concerns on one Embodiment of this invention. It is a top view of an enclosing case concerning one embodiment of the present invention. It is sectional drawing (a) about the CC line shown in FIG. 2, sectional drawing (b) about DD line, and sectional drawing (c) about EE line. It is sectional drawing (a) about the FF line shown in FIG. 2, and sectional drawing (b) about the II line. It is sectional drawing (a) about the BB line shown in FIG. 2, and sectional drawing (b) about the HH line. FIG. 2 is a rear view (a) and a top view (b) of a power module according to an embodiment of the present invention. FIG. 1 is a left side view (a), a right side view (b), and a front view (c) of a power module according to an embodiment of the present invention. It is an assembly completion perspective view of the power module concerning one embodiment of the present invention. The electric circuit board g which concerns on one Embodiment of this invention is a top view, and the block diagram of the structure mounted is shown. 1 is a system block diagram of a power module according to an embodiment of the present invention.

Explanation of symbols

a Heat sink d Outer case eu U phase current transformer circuit ew W phase current transformer circuit g Electric circuit board g1 Connector (for control information)
g2 connector (for program writing)
m lid

Claims (3)

A heat sink in which a U-phase, V-phase, and W-phase three-phase bridge type power conversion circuit and a temperature detection element are mounted via an insulating material;
An electric circuit board disposed above the power conversion circuit;
An enclosing case in which one end is fixed to the heat sink in a quadrilateral frame shape surrounding the power conversion circuit and the electric circuit board;
An anode terminal and a cathode terminal of the power conversion circuit held on the first side of the outer case;
U-phase, V-phase, and W-phase terminals held on the second side opposite to the first side of the outer case;
A lid covering the opening at the other end of the outer case;
With
A drive circuit for driving the power conversion circuit, a drive circuit power supply device for supplying power to the electric circuit board, a control circuit for controlling the drive circuit, and digital control information inputted from the outside A communication circuit that provides the control circuit with a control target value according to the transmission / reception and the control information, a first current detection circuit that detects a current of any one of the three phases, and a current of another phase A second current detection circuit,
The control circuit has a predetermined waveform based on the control target value, a value obtained from the temperature detection element, and a value obtained from the current detection circuit in order to realize the operation of the power conversion circuit according to the control target value. A function of generating a control current and outputting it to the drive circuit;
The drive circuit amplifies converting the control current to have a function of outputting a driving current to the power conversion circuit,
The U-phase bridge part, the V-phase bridge part, and the W-phase bridge part of the power conversion circuit are arranged in a predetermined order along one direction along the first side part,
The U-phase, V-phase, and W-phase terminals are arranged in the predetermined order in the one direction,
A first opening, a second opening, and a third opening that surround each one of the bridge portions are unevenly distributed on the side of the first side, and are arranged in the one direction. Formed in the order of the first opening, the second opening, the third opening,
Electrical connection pins are erected and fixed to a portion between the first opening and the second opening and a portion between the second opening and the third opening of the outer casing, respectively, , all or a power module that has been made part of the electrical connection between the power conversion circuit and the drive circuit. Wherein the first current transformer circuit is applied as a first current detection circuit, a second current transformer circuit is used as the second current detection circuit,
An inner space of the outer case between the first opening and the second side portion surrounds the conductor connecting between the bridge portion of any one of the three phases and the terminal in the same phase, and the conductor. The first current transformer circuit having a ring structure is arranged with the longitudinal direction of the conductor and the axial direction of the ring structure parallel to the second side part,
In the inner space of the outer case between the third opening and the second side portion, there is a conductor connecting the other one-phase bridge portion and the terminal in the same phase and a ring structure surrounding the conductor. The second current transformer circuit is arranged with the longitudinal direction of the conductor and the axial direction of the ring structure parallel to the second side part,
The power module according to claim 1 , wherein the first current transformer circuit and the second current transformer circuit are fixed to a back surface of the electric circuit board.   The power module according to claim 1, wherein the predetermined order is an order of U phase, V phase, and W phase.

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