JP6848178B2 - Housing for storing high-voltage equipment - Google Patents

Description

The present invention relates to a housing for accommodating a high-voltage device, and more particularly to a housing having an interlock function for ensuring safety when an operator inspects the high-voltage device inside the housing.

In the high-voltage equipment housed in the housing, an interlock device is attached to ensure the safety of the operator when the lid of the housing is opened, such as when inspecting the high-voltage equipment. For example, in Patent Document 1, in order to open the box lid of the inverter unit, the safety plug fitted to the safety switch of the battery pack is removed and fitted to the fitting portion of the interlock device of the inverter unit. It is possible to unlock the box lid of the inverter unit.

Further, in Patent Document 2, an actuator composed of a coil and a rod is provided in a case for accommodating an inverter, a housing is attached to the case via a hinge, and a key hole portion having a hole is provided on the inner surface side of the housing. It is described that a battery is connected to the inverter, the coil of the actuator is excited when the DC power is turned on, and the rod is inserted into the key hole to interlock.

JP 2006-136097 JP 2011-193546

In Patent Documents 1 and 2, as a means for configuring the interlock device, each component such as a safety switch and an actuator consisting of a fitting portion and a plug is required to be attached, and a housing for accommodating the inverter unit is also required. It has an exceptional structure, requires a large number of parts, and has a large interlock device.

An object of the present invention is to provide a housing for accommodating a high voltage device provided with an interlock detection circuit having a small number of parts.

According to the present invention, in a housing provided with a terminal cover for accommodating a device that operates with a DC power supply and outputs a high voltage, the electric circuit provided in the housing and connecting the DC power supply and the high voltage device is provided. An interlock detector that opens and closes the inserted contacts,
Interlock detection terminals A and B provided in the current flow path of the interlock detection unit, and
The terminals A and B are arranged at positions facing the terminal cover, and when the terminal cover is closed, the terminals A and B are made conductive so that the contacts are turned on via the interlock detection unit and the terminal cover is opened. It is provided with a terminal cover having a conductive portion that opens the path between the terminals A and B and turns off the contact.

Claim 2 of the present invention is a terminal cover made of a conductive material.

According to claim 3, the terminal cover is made of an insulating material, and the conductive material is arranged at a position facing the terminals A and B of the interlock detection unit.

According to claim 4, the lid of the housing made of a conductive material is provided with an insulating material in the vicinity of a step formed along a cross section in which the terminal cover is arranged.
A conductor that penetrates the insulating material and is connected to the interlock detection unit is derived, and the tip of the conductor is located on the side surface of the step to serve as terminals A and B of the interlock detection unit.
The terminal cover is formed of an insulating material, a step portion that engages with a step portion formed on the lid of the housing is provided on the outer peripheral portion, and a position facing the terminals A and B on the side surface of the step portion of the terminal cover. Insulating material is placed in.

According to claim 5, the high-voltage device is an inverter, the interlock detection unit is composed of a relay, and the power supply for exciting the relay is the control power supply of the inverter control unit.

As described above, according to the present invention, it is only necessary to provide the terminals A and B of the interlock detection unit on the housing portion facing the terminal cover and at least providing the conductive portion on the terminal cover facing the housing. Therefore, the interlock detection unit is configured with a small number of parts without using a jumper connector or the like as in the conventional case, and when the terminal cover is removed, the power supply to the inverter is inevitably cut off, which is the original high-voltage part. Contact with the AC terminals U, V, W, etc. is possible while ensuring safety.

The perspective view of the housing for accommodating a high voltage apparatus which shows embodiment of this invention. Top view of the housing for storing high voltage equipment to which the present invention is applied. The block diagram of the motor control device. The block diagram of the terminal cover applied to this invention. Explanatory drawing of the housing for accommodating high voltage equipment by this invention. Explanatory drawing of the housing for accommodating high voltage equipment by this invention.

FIG. 2 is a top view of a housing for storing high-voltage equipment to which the present invention is applied, showing a state in which the terminal cover is removed. When the high-voltage device is an inverter (hereinafter referred to as an inverter), the housing 1 comprises a switching element constituting the inverter, a board for a gate circuit or a control circuit of the switching element, and an inverter unit such as a capacitor. Contains the main parts. An opening 12 is formed in the lid 11 of the housing 1 and is fixed at an arbitrary position via a fixing means such as a bolt. A terminal chamber 13 is formed in the housing 1 in which the opening 12 is located, either directly or via a partition member such as a terminal plate, and the terminal chamber 13 contains AC terminals U, V, W of an inverter and a DC power supply. Terminals P and N are derived.

FIG. 3 shows a configuration diagram of a motor control device using an inverter, and an inverter portion surrounded by a dotted line is housed in the housing 1. A DC power supply (here, a storage battery Bat) is connected to the DC side of the inverter via the DC terminals P and N shown in FIG. 2, and a motor PM as a load is connected to the AC terminals U, V, and W. There is. The inverter is provided with a control unit Con, which is provided with a DC voltage detection value detected by a DC voltage sensor provided on the DC side bus of the inverter and U-phase and W-phase of the inverter AC bus. The AC current detection value is input. Further, a torque command value is input from the outside of the control unit Con, and a magnetic pole position detection value of the motor is input from a magnetic pole position sensor provided in the motor PM.

The control unit Con outputs a pulse width modulation command signal generated by vector control based on these command values and detection values from various sensors to a gate drive circuit (not shown). The gate drive circuit controls the motor by outputting a gate signal based on the input pulse width modulation command signal and controlling switching elements such as IGBTs on and off.

Further, the control unit Con is provided with an interlock detection unit ID having a relay Ry, and the contacts Ry-1 and Ry-2 of the relay Ry are between the positive electrode terminal and the negative electrode terminal of the storage battery Bat and the DC terminals P and N of the inverter. Are connected to each. The power supply E of the relay Ry may be separately provided as a dedicated power supply, but generally, a 15V power supply or the like used in the control unit Con is used as a power supply for controlling the inverter. The interlock detection terminals A and B of the interlock detection unit ID are arranged in the terminal chamber 13 shown in FIG.

FIG. 1 shows an embodiment of the present invention. As shown in FIG. 1A, terminals A and B for interlock detection of the interlock detection unit ID are provided directly on the lid 11 close to the opening 12 side. In this embodiment, when the lid 11 is made of an insulating member, the conductive portions 16a and 16b are arranged along the cross section of the lid 11 forming the terminal chamber 13, and the terminals A and 16b for interlock detection are arranged. It is said to be B. In this case, the terminal cover 2 used is made of a conductive material such as aluminum or copper at a portion facing the terminals A and B, or as a whole.

When the lid 11 is made of a conductive material, an insulating member is arranged at a portion of the lid 11 for fixing the terminals A and B for interlock detection. The terminal cover 2 used in this case is formed of an insulating member, and a conductive material is arranged at a position facing the terminals A and B.

Normally, the terminal chamber 13 is covered with the terminal cover 2, and when the power for controlling the inverter is turned on, the relay Ry of the interlock detection unit ID is excited by the conduction between the terminals A and B. , The contacts Ry-1 and Ry-2 are in the on (closed) state. In this state, when it becomes necessary to inspect an electric device such as an inverter for some reason, first, the terminal cover 2 is removed. By removing the terminal cover 2, the relay Ry of the interlock detection unit ID is de-energized by opening the space between the terminals A and B as shown in FIG. 1 (b), and the contacts Ry-1 and Ry of the relay Ry are de-energized. -2 turns off (open circuit) and the DC power supply to the inverter is cut off.

As a result, the inverter operation is stopped, and contact with the AC terminals U, V, W, etc., which are high-pressure portions in the terminal chamber 13, is possible while ensuring safety. That is, since the power supply is inevitably cut off by simply removing the terminal cover 2, interlocking for safety is possible without changing the housing itself with a small number of parts.

FIG. 4 shows the terminal cover 2 to be used, and FIG. 4A is used when the terminal cover 2 is made of an insulating material like the lid 11, and is used for interlock detection. A conductive portion 21 is provided on the terminal cover 2 facing the terminals A and B of the above, and when the opening 12 is covered with the terminal cover 2, the terminals A and B are in a conductive state, and when the terminal cover 2 is removed, FIG. In the state of (b), the terminals A and B are opened.

FIG. 4B shows a case where the entire terminal cover 2 is made of a conductive member, and FIG. 4C shows a case where the terminal cover 2 is made of an insulating material. The side surface of the terminal cover 2 is formed in a two-stage structure, and the lid 11 is formed. When the conductive portion 22 is arranged at a position where it engages with and faces the terminals A and B and is covered with the terminal cover 2, the terminals A and B are brought into a conductive state.

FIG. 5 shows an example in which the lid 11 of the housing is made of a conductive material. A step portion 11a is provided on the opening 12 side of the lid 11, and an insulating portion 15 is provided in the vicinity of the step portion 11a from which the terminals A and B are led out. The conductive portions 16a and 16b of the interlock detection unit ID derived through the insulating portion 15 are arranged along the cross section of the opening portion 12 and are designated as terminals A and B. That is, the terminals A and B are located on the side surface of the step portion 11a.

Since the terminals A and B are located on the side surface of the step portion 11a, the possibility of conduction between the terminals A and B when a conductor such as a tool is dropped is reduced. 4 (a) and 4 (c) are applied to the terminal cover 2 used in FIG. 5, and FIG. 4 (c) is particularly preferable.

In the case of this embodiment as well, as in the case of the first embodiment, when the terminal cover 2 is removed, the power supply to the inverter is cut off, and contact with the high-voltage AC terminals U, V, W, etc. is possible while ensuring safety. It becomes.

FIG. 6 shows an example in which a support portion 14 made of an insulating member is provided in the terminal chamber 13, and terminals A and B for interlock detection are arranged at the apex of the support portion 14. The support portion 14 has a height that allows it to come into contact with the terminal cover 2 when the terminal cover 2 is covered with the support portion 14. FIGS. 4 (a) and 4 (b) are applied to the terminal cover 2 used in this embodiment.

In the case of this embodiment as well, as in the first and second embodiments, when the terminal cover 2 is removed, the power supply to the inverter is cut off, and the contact with the high-voltage AC terminals U, V, W, etc. ensures safety. However, it becomes possible.

1 ... Housing 2 ... Terminal cover 11 ... Lid 12 ... Opening 13 ... Terminal chamber 14 ... Support 15 ... Insulation

Claims (2)

Operating in a DC power source with the instrument to output a high voltage, it is accommodated in a housing, and interlock detection unit for opening and closing a contact interposed in path which connects the said direct current power supply device,
Interlock detection terminals A and B provided in the current flow path of this interlock detection unit, and
Wherein when the opening of the cover of the housing and the closed terminal A, and the opening of the contact through the interlock detector by conduction while the on state between B to open from the closed When a terminal cover having a conductive portion that opens the path between the terminals A and B and turns off the contact is provided.
The lid made of a conductive material is provided with an insulating material in the vicinity of a step along the opening.
The tip of the conductor connected to the interlock detection portion derived through the insulating material is located on the side surface of the step portion to form the terminals A and B.
The terminal cover is made of an insulating material, and the outer peripheral portion of the terminal cover has a step portion that engages with the step portion of the lid.
The stepped portion of the terminal cover is a housing for storing high-voltage equipment, characterized in that the conductive portion is arranged so as to face the terminals A and B. The device is an inverter
The interlock detector is composed of a relay.
The housing for storing high-voltage equipment according to claim 1, wherein the power supply for exciting the relay uses the power supply for controlling the inverter.

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