JPH04114789U - Inverter using high-speed switching elements - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an inverter using high-speed switching elements that can effectively utilize space, equalize DC voltage, and reduce reactance of distribution lines. [Configuration] P-side arm switching elements TRU, TR
Switching element TR on the N side arm for V, TRW
X, TRY, and TRZ are of opposite polarity, and the switching elements of the P side arm and the N side arm are provided on the heat dissipation fin 2 so that they do not overlap in the ventilation direction, and the terminals on the AC output side of each phase switching element are connected to the conductor plate 4. ₁ to 4 ₃ , connect the AC side conductor to the center positions U, V, and W, and install the positive and negative storage DC bus bars P and N in parallel at the intermediate position between the N side and P side mounting part. Fuse EFU on each arm that connects the bus bar and switching element to the parts on both sides of the bus bar where there are no switching elements
Establish an EFZ.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on the arrangement of elements in an inverter circuit using high-speed switching elements. and related to main circuit wiring.

0002

[Conventional technology]

Inverter circuit using transistor modules as high-speed switching elements In this case, each arm is provided with a fuse to protect the circuit in case of element damage. high frequency In an inverter circuit that operates using waves, the reactance of the main circuit wiring is particularly high. When the device is turned off, a surge is generated at both ends of the device.

0003 Therefore, it is necessary to clip the DC voltage, and the wiring on the DC bus and AC side They are often arranged parallel to each other. Therefore, the fuse on the transistor module is A method is used to reduce the reactance of the wiring by attaching wires.

0004

[Problem that the idea aims to solve]

Conventionally, both P-arm and N-arm were used as transistor modules, for example, collectors. Since the connector terminal is of the same polarity and is located outside the emitter terminal, space is required. cannot be used effectively, and fuses and switching elements are on the same plane. If the internal bolts etc. are no longer visible, check the lower switching element. There was a problem that it became difficult to

[0005] This invention was devised in view of these conventional problems, and its purpose and purpose This allows efficient use of space, equalization of DC voltage, and wiring reactor. To provide an inverter using high-speed switching elements that can reduce the power consumption. It is in.

[0006]

[Means to solve the problem] In order to achieve the above objectives, an inverter using the high-speed switching element of the present invention was developed. The switching element of the N-side arm is reversed with respect to the switching element of the P-side arm. The switching elements of the P-side arm and N-side arm should be polarized and overlap in the ventilation direction. Terminals are provided on the heat dissipation fins to prevent Connect with a conductor, connect an AC conductor to the center position, and connect the P side arm and N side arm. Connect the positive and negative AC to the intermediate position of the switching element so as not to contact the AC side conductor. The busbars are installed in parallel, and the busbars and switch A fuse is provided for each arm to which the switching element is connected.

[0007]

[Effect]

The polarity of the switching element on the N side arm is opposite to the switching element on the P side arm. Since it is provided on the P side and N side mounting parts, a symmetrical arrangement is possible, and the DC bus bar is placed in the center. Can be placed parallel to the position. This makes it possible to use space effectively and to reduce DC voltage. is equalized. Also, between P busbar → collector → emitter → AC conductor and AC conductor → The space between the collector → emitter → N bus is reduced, and the wiring reactance is also reduced. Therefore, the surge during switching can be kept low.

[0008] Make sure that the switching elements of the P side arm and N side arm do not overlap in the ventilation direction. Because each switching element is cooled on average, temperature variations between the elements are reduced. You can reduce your luck.

[0009]

【Example】

FIG. 1 shows the structure of an inverter according to an embodiment of the present invention, and FIG. 2 shows the structure of the inverter according to an embodiment of the present invention. The circuit diagram is shown. In Figure 1, 1 is a wind tunnel, 2 is an inverter transistor module. A heat dissipator that radiates heat generated by the module (switching element). Fin 3 is a heat dissipation fin that cools the wind tunnel.

0010 For TRU, TRV, and TRW, the collector terminal C of the P side arm of the inverter is an emitter. The transistor module located outside the terminal E, and the heat dissipated member of the heat dissipation fin 2. Attach to the lower parts of a, c, and e of imaginary lines a to f equidistant in the direction of fin passage on the mounting surface S. has been done.

TRX, TRY, and 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 are attached to the heat dissipation fin 2 above the virtual lines b, d, and f. Each of the collector terminals C is connected to the emitter terminal E of the transistor module of the P side arm through conductor plates 4 ₁ to 4 ₃ , respectively. The AC output conducting wires are connected to the center points U, V, and W of the conductive plates 4 ₁ to 4 ₃ .

P and N are positive and negative DC busbars of the inverter, which are provided at the center of the P side and the N side so as not to come into contact with the conductive plates 4 ₁ to 4 ₃ . EFU, EFV, and EFW are P-side arm fuses, which are placed on virtual lines b, d, and f where no transistor modules are placed, and one end of which is connected to the collector terminal C of the P-side arm transistor modules TRU, TRV, and TRW. The other end is connected to the bus bar P via the conductor plates 5 ₁ to 5 ₃ .

EFX, EFY, EYZ are N-side arm fuses and are arranged on virtual lines a, c, e, one end of which is connected to the emitter terminal E of the N-side arm transistor module TRX, TRY, TRZ on the conductor plate 5 ₄ ~ ₅₆ , and the other end is connected to bus N.

[0014]

[Effect of the idea]

Since the present invention is configured as described above, it produces the following effects.

[0015] (1) Since the DC bus bar can be arranged parallel to the central position, the DC voltage can be made uniform.

[0016] (2) The reactance of the wiring can be reduced, so the sa The page can be held low.

[0017] (3) The switching elements on the P side and N side are arranged symmetrically, making space efficient. Available for

[0018] (4) The switching elements on the P side and N side are arranged out of alignment with respect to the flow of cooling air. Therefore, there is little variation in temperature between elements.

[0019] (5) Since the fuse does not overlap the switching element, Easy to check.

[Brief explanation of drawings]

FIG. 1 (A) and (B) 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 same inverter.

[Explanation of symbols]

1... Wind tunnel, 2, 3... Heat dissipation 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)

[Scope of utility model registration request] [Claim 1] N for the switching element of the P side arm
The switching elements on the side arms are of opposite polarity, and the switching elements on the P and N side arms are installed on the heat dissipation fin so that they do not overlap in the ventilation direction, and the terminals on the AC output side of each phase switching element are connected with a conductor. An AC conductor is connected to the central position of the AC conductor, and positive and negative DC busbars are provided in parallel between the switching elements of the P-side arm and the N-side arm so as not to contact the AC-side conductor, and both sides of this busbar are connected to the AC conductor. An inverter using a high-speed switching element, characterized in that a fuse for each arm connecting the bus bar and the switching element is provided in a part of the inverter where there is no switching element.