JP2562581Y2 - Inverter using high-speed switching element - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of elements and wiring of a main circuit in an inverter circuit using high-speed switching elements.

[0002]

2. Description of the Related Art In an inverter circuit using a transistor module as a high-speed switching element, a fuse is provided in each arm to protect the circuit when the element is damaged. In an inverter circuit that operates at high frequency, especially when the element is turned off by the reactance of the wiring of the main circuit wiring,
Surge occurs at both ends of the element.

Therefore, it is necessary to clip the DC voltage, and the DC bus and the wiring on the AC side are often arranged in parallel. For this reason, a method of reducing the reactance of the wiring by mounting a fuse on the transistor module has been adopted.

[0004]

Conventionally, as the transistor module, both the P-arm and the N-arm have the same polarity with the collector terminal outside the emitter terminal, for example, so that the space can be effectively used. When the fuse and the switching element are on the same plane, the internal bolts and the like become invisible, making it difficult to check the lower switching element.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to make effective use of space, to make DC voltage uniform and to reduce wiring reactance. An object of the present invention is to provide an inverter using a high-speed switching element.

[0006]

In order to achieve the above object, an inverter using a high-speed switching element according to the present invention has a switching element of an N-side arm having a polarity opposite to that of a switching element of a P-side arm, P side arm and N
The switching element of the side arm is provided on the heat radiation fin so as not to overlap in the ventilation direction, the terminal on the AC output side of each phase switching element is connected by a conductor, and the AC conductor is connected at the center position, and the P side arm and N A positive and an intermediate position of the switching element of the side arm so as not to contact the AC side conductor.
A negative AC bus is provided in parallel, and a fuse of each arm connecting the bus and the switching element is provided at a portion of the bus without switching elements on both sides.

[0007]

Since the switching element of the N-side arm is provided on the P-side and N-side mounting portions with the opposite polarity to that of the switching element of the P-side arm, the switching element can be arranged symmetrically, and the DC bus can be arranged parallel to the center position. Therefore, the space can be effectively used, and the DC voltage can be made uniform. Further, the space between the P bus → the collector → the emitter → the AC conductor and the space between the AC conductor → the collector → the emitter → the N bus are reduced, and the reactance of the wiring is also reduced, so that the surge at the time of switching can be suppressed low.

[0008] Since the switching elements of the P-side arm and the N-side arm are provided so as not to overlap in the ventilation direction, each switching element is cooled on average, and the temperature variation between the elements can be reduced.

[0009]

1 shows a structure of an inverter according to an embodiment of the present invention, and FIG. 2 shows a circuit diagram of the inverter. FIG.
In the drawings, 1 is a wind tunnel, 2 is a radiator fin for mounting a transistor module (switching element) of an inverter and radiating heat generated in the module, and 3 is a radiator fin for cooling the wind tunnel.

TRU, TRV, and TRW are transistor modules in which the collector terminal C of the P-side arm of the inverter is outside the emitter terminal E, and are imaginary at equal intervals in the fin passage direction of the heat-radiating member mounting surface S of the heat-radiating fin 2. Lines a-f
Are attached to the lower portions of a, c, and e.

TRX, TRY, TRZ are transistor modules in which the emitter terminal E of the N-side arm of the inverter is outside the collector terminal C, and is attached to the heat radiation fin 2 above the virtual lines b, d, f. as the collector terminal C is connected to the emitter terminal E of the transistor module of each P-side arm conductor plate 4 ₁ to 4 _3. AC output lead is connected center U of the conductive plate 4 ₁ ~4 _3, V, and W point.

P and N are positive and negative DC buses of the inverter.
It is provided so as not to contact the P-side and N conductive plate at the center of side ₄₁ to _3. EFU, EFV, and EFW are fuses of the P-side arm, which are arranged on virtual lines b, d, and f where no transistor module is arranged, and one end of which is located at P-side.
Side arm transistor modules TRU, TRV, T
RW is connected via the conductor plate 5 ₁ to 5 ₃ to the collector terminal C of the other end is connected to the bus P.

EFX, EFY, and EYZ are fuses of an N-side arm and are arranged on virtual lines a, c, and e.
Side arm transistor modules TRX, TRY, T
Are connected via the conductor plate 5 _{4-5 6} RZ emitter terminal E, the other end is connected to the bus N.

[0014]

The present invention is configured as described above, and has the following effects.

(1) Since the DC bus can be arranged in parallel at the center, the DC voltage can be made uniform.

(2) Since the reactance of the wiring can be reduced, the surge at the time of switching can be suppressed low.

(3) Since the P-side and N-side switching elements are symmetrically arranged, space can be effectively used.

(4) Since the switching elements on the P side and the N side are displaced from the flow of the cooling air,
There is little fluctuation in temperature between elements.

(5) Since the fuse does not overlap with the switching element, the switching element can be easily checked.

[Brief description of the drawings]

FIGS. 1A and 1B are a front view and a side view showing an inverter according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of the inverter.

[Explanation of symbols]

1 ... wind tunnel, 2, 3 ... heat radiation fin, 4 ₁ to 4 ₃ , 5 _{1 to} 5 ₆ ...
Conductor plate, N, P ... DC bus, TRU, TRV, TRW ...
Transistor module, TRX, TRY, TRW ... reverse polarity transistor module, EFU, EFV, EF
W, EFX, EFY, EFZ, ... fuse.

Claims (1)

(57) [Scope of request for utility model registration] 1. A switching element for a P-side arm is connected to an N
The switching elements of the side arm have reverse polarity, and the switching elements of the P side arm and the N side arm are provided on the heat dissipation fin so that they do not overlap in the ventilation direction. The terminals on the AC output side of each phase switching element are connected by conductors Then, an AC conductor is connected to the center position thereof, and positive and negative DC buses are provided in parallel between switching elements of the P-side arm and the N-side arm so as not to contact the AC-side conductor. An inverter using a high-speed switching element, characterized in that a fuse for each arm for connecting the bus and the switching element is provided in a portion without the switching element.