JP2003189624A - Power supply and motor controller utilizing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly safe power supply using an electrolytic capacitor and a motor controller utilizing the power supply. <P>SOLUTION: The electrolytic capacitor 15 is fixed by soldering vertically on a circuit board 16. The capacitor 15 is capped by a fire-proof casing 11, with glass wool 14 provided inside its cap part 12 and with its claw part 13 pressing and holding the outside circumference part of the capacitor 15. The space between the top part of the cap part 12 and a box 17 is set in such a way as to prevent the cap part 12 from being detached even if an explosion- proof valve is actuated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ensuring the safety of an electrolytic capacitor connected to a power converter that converts an AC input into a DC output.

[0002]

2. Description of the Related Art Motor control devices are widely used for controlling the speed and torque of motors, which are the drive source of industrial equipment. Depending on the application and installation location (including foreign countries), the input voltage can be AC100V to AC400V. It is necessary to share the control unit and the power supply unit is individually compatible, and if a voltage higher than the standard is applied to the AC power supply by mistake,
The internal pressure of the smoothing electrolytic capacitor connected to the DC output section of the power conversion section rises rapidly and explodes at an unspecified location. In order to prevent this, an explosion-proof valve is provided so that it bursts in a specific direction (mostly the top surface of the condenser) (Fig. 3).

However, when the explosion-proof valve is actuated by the application of an abnormal voltage, the electrolytic solution contained therein may scatter together and may ignite in some cases.

For this reason, a structure having a cap portion for covering the explosion-proof valve portion of the electrolytic capacitor and a tab portion for preventing the cap from coming off when the explosion-proof valve is operated, and a part of the fireproof case for covering the electrolytic capacitor body are soldered to the circuit board. Proposals have been made to prevent the electrolyte from scattering and to prevent fire, such as by attaching and fixing.

In FIG. 4, the explosion-proof valve portion of the electrolytic capacitor is covered with a nonflammable fireproof case 41 to prevent scattering of the electrolytic solution which is a cause of ignition to other electronic parts, and to prevent ignition in the fireproof case 41. It is put into an oxygen deficient state by suppressing it and put out a fire.

FIG. 5 shows a fireproof case fixed to a circuit board. The fireproof case 51 is inserted into a through hole on the circuit board 52 and fixed by soldering together with other electric parts in a solder bath. This fire protection case 51
In consideration of solderability, workability, and incombustibility, the metal plate is bent.

[0007]

However, in the above-mentioned conventional structure, when the explosion-proof valve is operated, the electrolyte solution can be prevented from scattering, but there is nothing to absorb, so that the electrolyte solution may leak in a small amount. Although the electrolytic capacitor itself could be protected against fire, the leaked electrolyte could catch fire. As a countermeasure, if the entire electrolytic capacitor is covered, it is necessary to drastically change the size of the product itself, or it is necessary to place restrictions on the assembly work.

Further, as the temperature of the electrolytic capacitor rises,
There is a possibility that the electrolytic solution evaporates through the sealing rubber on the lead wire side, resulting in liquid leakage due to dry-up, and the evaporated electrolytic solution adheres to the electronic components near the sealing rubber in a solid state.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a highly safe power supply device using an electrolytic capacitor and a motor control device using the same at low cost.

[0010]

In order to solve the above problems, a power supply device of the present invention is a power converter for converting an AC input into a DC output, and an explosion-proof valve connected in parallel to the DC output of the power converter. A smoothing electrolytic capacitor, a non-combustible fireproof case that is attached to the electrolytic capacitor and absorbs electrolyte when the explosion-proof valve section operates, and a housing that houses a power circuit section. The safety of the device can be secured.

[0011]

In order to solve the above problems, a power supply device according to a first aspect of the present invention is a power converter for converting an AC input into a DC output, and an explosion proof connected in parallel to a DC output of the power converter. A smoothing electrolytic capacitor with a valve, a non-combustible fireproof case that is attached to the electrolytic capacitor and absorbs electrolyte when the explosion-proof valve unit is activated, and a housing that houses a power supply circuit unit, When the explosion-proof valve operates, it absorbs the electrolyte in the fireproof case, so the electrolyte does not leak outside.

Further, in the power supply device according to the second aspect of the present invention, fire protection is provided by the cap portion that covers the explosion-proof valve portion of the vertical electrolytic capacitor, the claw portion that presses and holds the outer peripheral portion, and the nonflammable absorber disposed in the cap portion. The case is configured to ensure safety when the explosion-proof valve of the electrolytic capacitor installed vertically is activated.

Further, in the power supply device according to the third aspect of the present invention, a cap portion for covering the explosion-proof valve portion of the horizontal electrolytic capacitor, a pin for fixing the cap portion, and a nonflammable absorber arranged in the cap portion forms a fireproof case. With this configuration, safety can be secured when the explosion-proof valve of the electrolytic capacitor placed horizontally is activated.

According to a fourth aspect of the power supply device of the present invention, the explosion-proof valve portion and the lead wire portion of the horizontally placed electrolytic capacitor are individually covered with a fireproof case. It is possible to ensure safety when operating and to prevent the electrolytic solution from evaporating from the lead wire side and adhering to peripheral parts.

Further, in the power supply device according to the fifth aspect, the cap portion of the fireproof case is made porous, and the blast wind when the explosion-proof valve is activated can be buffered and absorbed by the porous portion.

Further, by mounting the power supply device according to any one of claims 1 to 5, even if a voltage higher than the standard is applied to the power supply input portion by mistake, the motor control is highly safe. The device is obtained.

[0017]

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

(Embodiment 1) In FIG. 1, 11 is a fireproof case, which is composed of a cap portion 12, a claw portion 13, and a glass wool 14 as a hygroscopic nonflammable material. Reference numeral 15 is an electrolytic capacitor with an explosion-proof valve, 16 is a circuit board, and 17 is a housing.

The cap portion 12 and the claw portion 13 are integrally formed of a resin material in consideration of workability and incombustibility.

The electrolytic capacitor 15 is fixed to the circuit board 16 by soldering vertically. Then, the glass wool 14 is attached to the inside of the cap portion 12 of the fireproof case 11 and is covered with the electrolytic capacitor 15, and the outer peripheral portion of the electrolytic capacitor 15 is pressed and held by the claw portion 13.

Further, the gap between the upper portion of the cap portion 12 and the housing 17 is set so that the cap portion 12 does not come off even if the explosion-proof valve operates.

Therefore, even if the explosion-proof valve operates, the fire-proof case 11 is pressed and held by the claw portion 13 and does not come off.
Even if the cap portion 12 cannot be held, the cap portion 12 remains
It does not come off.

When the explosion-proof valve operates, the electrolytic capacitor 15
Although the electrolyte solution is dispersed in the cap portion 12, it is absorbed by the water-absorbent glass wool 14 mounted in the cap portion 12, does not leak to the outside of the fire protection case 11, and ignition can be prevented.

(Embodiment 2) Embodiment 2 is effective for fire prevention and dry-up of an electrolytic capacitor placed horizontally on a circuit board.

In FIG. 2, reference numeral 21 denotes a fireproof case, which is composed of a cap portion 22, a pin 23, and a glass wool 24 as a hygroscopic nonflammable material. Reference numeral 25 is an electrolytic capacitor with an explosion-proof valve, and 26 is a circuit board.

The electrolytic capacitor 25 is placed horizontally on the circuit board 2
6 is attached to the inside of the cap portion 22 of the fireproof case 21, the glass wool 24 is attached, and the electrolytic capacitor 25
Of the electrolytic capacitor 25 and the pin 2 of the fire protection case 21 by individually covering from the explosion-proof valve side and the lead wire side respectively.
3 is fixed to the circuit board 26 by soldering.

Here, a space is provided between the explosion-proof valve portion of the electrolytic capacitor 25 and the inside of the cap portion 22 so that the explosion-proof valve operates.

Even if the explosion-proof valve operates, the fire-proof case 21 is fixed to the circuit board 26 by the pin 23 and does not come off. Further, since the glass wool 24 absorbs the electrolytic solution which is about to scatter, the glass wool 24 does not leak out of the fire protection case 21,
Can prevent ignition.

The electrolytic solution of the electrolytic capacitor 25 tries to leak from the lead wire side through the sealing rubber, but is absorbed by the glass wool 24 mounted inside the cap portion 22 and leaks out of the fire protection case 21. Since it does not exist, solid adhesion does not occur to peripheral parts, and reliability of peripheral parts can be secured.

The fireproof case is not limited to synthetic resin and may be made of metal, and if the cap portion is made porous, it is possible to buffer and absorb the blast when the explosion proof valve operates. Further, the non-combustible absorbent material may be made porous to absorb the blast and the electrolytic solution.

[0031]

As is apparent from the above-described embodiments, according to the first and second aspects of the present invention, by providing a fireproof case for absorbing the electrolytic solution, the explosion-proof of the power supply device using the vertical electrolytic capacitor is provided. It is possible to secure safety during valve operation.

According to the first and third aspects of the invention,
By providing the fireproof case that absorbs the electrolytic solution, it is possible to ensure the safety when the explosion-proof valve of the power supply device using the horizontal electrolytic capacitor operates.

According to the fourth aspect of the invention, it is possible to prevent liquid leakage from the lead wire side and adhesion to peripheral parts.

According to the fifth aspect of the present invention, by forming the cap portion to be porous, it is possible to absorb and absorb the blast wind when the explosion-proof valve operates.

Further, according to the invention of claim 6, a motor controller having high safety can be obtained by mounting the above power supply device.

As described above, even when the explosion-proof valve of the electrolytic capacitor with the explosion-proof valve is activated, the electrolytic solution is absorbed in the fireproof case and prevented from leaking to the outside, so that a highly safe power supply device and motor control device are provided. can get.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a fireproof structure according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a fireproof structure according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a motor control circuit.

FIG. 4 is an explanatory view of a conventional fireproof structure.

FIG. 5 is an explanatory view of another conventional fire protection structure.

[Explanation of symbols] 11,21 Fire protection case 12,22 Cap part 13 Claws 14,24 Non-flammable absorbent (glass wool) 15,25 Electrolytic capacitor 17 housing 23 pin

Front page continuation (51) Int.Cl. ⁷ identification code FI theme code (reference) H05K 7/12 H05K 7/12 AF term (reference) 4E353 AA06 AA16 AA18 AA19 BB02 BB05 DD08 DD11 DR13 DR24 DR36 DR53 GG16 GG29 4E360 AB12 AB32 AB51 BA03 BA12 BC03 BC06 CA08 EA18 EC04 ED03 ED13 ED17 ED23 ED27 FA08 GA12 GA26 GA42 GB99 5H006 AA00 BB05 CA07 CB01 CC08 HA83

Claims (6)

[Claims] 1. A power conversion section for converting an AC input into a DC output, a smoothing electrolytic capacitor with an explosion-proof valve connected in parallel to a DC output section of the power conversion section, and an explosion-proof valve section mounted on the electrolytic capacitor. A power supply device comprising: a non-combustible fireproof case that absorbs an electrolytic solution when activated, and a housing that houses a power supply circuit section. 2. The fireproof case comprises a cap portion that covers the explosion-proof valve portion of the vertical electrolytic capacitor, a claw portion that presses and holds the outer peripheral portion, and a non-combustible absorber disposed in the cap portion. Power supply. 3. The power supply according to claim 1, wherein the fireproof case comprises a cap portion for covering the explosion-proof valve portion of the horizontal electrolytic capacitor, a pin for fixing the cap portion, and a nonflammable absorber arranged in the cap portion. apparatus. 4. The power supply device according to claim 3, wherein the explosion-proof valve portion and the lead wire portion of the horizontally placed electrolytic capacitor are individually covered with a fireproof case. 5. The power supply device according to claim 2, wherein the cap portion of the fireproof case is made porous. 6. A motor control device equipped with the power supply device according to claim 1.