JP5574766B2 - Device for preventing live operation of high voltage part of electric vehicle - Google Patents

Description

  The present invention relates to a high-voltage part live-line work prevention device for an electric vehicle that runs using an electric motor (hereinafter referred to as a motor) driven by electric power charged in a high-voltage power storage device as a power generation source. The electric vehicle to which the present invention is applied includes an electric vehicle that uses only the power storage device as a power source, a hybrid vehicle that uses a combination of the power of the power storage device and an internal combustion engine, and the power storage device and a fuel cell. This includes all electric vehicles equipped with a high-voltage power storage device, such as hybrid vehicles used together.

  Conventionally, in an electric vehicle that travels by transmitting rotational torque of a motor driven by electric power of a DC high-voltage power storage device to wheels, the motor is rotated between the power storage device and the motor. A configuration is adopted in which a power converter for converting direct current to alternating current is inserted.

  In such an electric vehicle, in order to prevent the high-voltage part hot-wire work, for example, as shown in Patent Document 1, a mechanism for housing the inverter unit in a conductive housing including a case and an upper lid is provided.

  In the technique according to Patent Document 1, an interlock detection terminal provided on the housing is removed from the housing in order to open the upper lid when working on the inverter unit. Thereby, the electrical connection state of the interlock detection terminal and the housing is opened, and this open state is detected by an ECU (electronic control unit).

  The ECU that has detected the open state gives an open command to the main relay to turn the main relay that is inserted between the inverter unit and the secondary battery outside the housing from the closed state to the open state. .

  As a result, the main relay is opened and no high voltage is supplied from the secondary battery to the inverter unit, and the operator can supply high voltage power from the secondary battery to the inverter unit. Maintenance and inspection work of the inverter unit is performed without permission.

  Moreover, in the technique which concerns on patent document 2, the detection circuit which detects the state in which the high voltage is applied with respect to the electrical storage device accommodated in the case with a lid | cover is provided independently, and application of a high voltage is carried out by this detection circuit. When not detected, the rod of the linear actuator (protective cover closed state fixing means) serving as the key (lock) of the lid is retracted to open the lid.

JP 2006-14577 A ([0040]-[0050], FIG. 1) Japanese Patent Laid-Open No. 6-98403 (Abstract, FIGS. 1 and 5)

  However, in the technique according to Patent Document 1, when the main relay is welded and has a closed failure (failure with the relay closed), the interlock detection terminal and the housing are electrically connected. Even if the ECU that detects the open state of the state sends an open command to the main relay, the main relay does not open but remains closed.

  Therefore, in the technique according to the above-mentioned Patent Document 1, voltage is measured by a tester before work so as to check whether or not the main relay has failed so as not to work in a live state of a high-voltage part during maintenance and inspection work. Such complicated work is required.

  Further, in the technique according to Patent Document 2, an independent detection circuit that detects a state in which a high voltage is applied to the battery is required, and the detection circuit includes an electrical component that detects a high voltage (for example, a high voltage power supply). Current limiting resistor and a photocoupler connected between the power supply output terminals of the power supply and a determination circuit electrical component for determining whether or not the voltage detected by the electrical component is a high voltage. There is a problem.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a high-voltage part hot-line work prevention device for an electric vehicle that can reliably prevent high-voltage part hot-line work. .

High voltage club line work preventing apparatus for an electric vehicle according to the present invention includes a charge reservoir, a power conversion device, is connected to one end side of the electric storage device, and wire the other end side is connected to the power converter, wherein A travel motor driven by a power conversion device; a housing that includes a case portion that houses the power conversion device and the other end of the electric wire; and a cover portion that covers the opening of the case portion and can be opened and closed. A manual switch that is inserted between the power storage device and the power converter and is manually opened and closed outside the housing; and outside the housing, the power storage device and the power an inserted electrically connected between the converter, and a relay that opens and closes in conjunction with the Ofuon the ignition switch of the electric dynamic vehicle, is accommodated in the housing, b such that the cover portion is not open A locked state to click, the low voltage drive type electric actuator capable of switching to the unlocked state that allows the cover part is opened, and a step-down DC / DC converter from the electric wire in front Symbol housing Power is supplied to the power supply terminal of the low voltage drive type electric actuator via the step-down DC / DC converter, and the low voltage drive type electric actuator is supplied with power to the power supply terminal. It is switched to the unlocked state when there is no power, and switched to the locked state when power is supplied to the power supply terminal .

According to this invention, the low voltage drive type electric actuator that can be switched between a locked state that prevents the cover portion that covers the case portion that houses the power conversion device from being opened and an unlocked state that allows the opening is provided, Electric power applied from the power storage device to the power conversion device through an electric wire is used as an operation power source for the low-voltage drive type electric actuator.

When power to the power supply terminal of the low voltage drive type electric actuator is not supplied, the cover part by the low voltage drive type electric actuator is unlocked. Meanwhile, the low voltage drive type electric actuator is operated the cover part is in the locked state when power to said power supply terminal of the low voltage drive type electric actuator is supplied. Therefore, the cover part can be opened only when power is not supplied to the power converter through the electric wire. Thereby, a high voltage | pressure part hot wire operation | work can be prevented reliably.

In this case, since the power from the electric wire in front Symbol housing is wired so as to be supplied to the power supply terminal of the low voltage drive type electric actuator via the step-down DC / DC converter, the selection of the electric actuator Can be expanded. Therefore, a low-cost electric actuator can be employed.

High voltage club line work preventing apparatus for an electric vehicle according to the present invention includes a charge reservoir, a power conversion device, is connected to one end side of the electric storage device, and wire the other end side is connected to the power converter, wherein A traveling motor driven by the power conversion device, a vehicle front chamber formed in front of the driver's seat of the vehicle and accommodating at least the power conversion device and the other end side of the electric wire, and an upper side of the vehicle front chamber A hood that covers the outside of the vehicle front chamber, and is inserted between the power storage device and the power conversion device and manually opens and closes an electrical connection; and outside the vehicle front chamber. A relay that is inserted between the power storage device and the power conversion device and that opens and closes an electrical connection in conjunction with an ON / OFF state of an ignition switch of the electric vehicle, and is provided on the vehicle front chamber side of the bonnet. Provided, comprising a lock state to lock so that the hood does not open, and the low voltage drive type electric actuator capable of switching to the unlocked state that allows the bonnet is opened, and the step-down DC / DC converter, and wire as power from the electric wire in front Symbol vehicle front chamber is supplied to the power supply terminal of the low voltage drive type electric actuator via the step-down DC / DC converter, the low voltage drive type electric actuator The power supply terminal is switched to the unlocked state when power is not supplied, and is switched to the locked state when power is supplied to the power supply terminal .

According to the present invention, the low-voltage drive type electric actuator that can be switched between a locked state that prevents the bonnet that covers the vehicle front chamber that houses the power conversion device from being opened and an unlocked state that allows the opening is provided. Electric power applied from the device to the power conversion device through an electric wire is used as an operation power source for the low-voltage drive type electric actuator.

The bonnet is unlocked when power is not supplied to the power supply terminal of the low voltage drive type electric actuator. On the other hand, the bonnet is locked when power is supplied to the power supply terminal of the low-voltage drive type electric actuator.

  Therefore, the bonnet can be opened only when power is not supplied to the power converter through the electric wire. Thereby, a high voltage | pressure part hot wire operation | work can be prevented reliably.

In this case, by pre-Symbol wiring as power from the electric wire at the front of the vehicle compartment is supplied to the power supply terminal of the low voltage drive type electric actuator via the step-down DC / DC converter, the electric actuator The range of choices can be expanded. Therefore, a low-cost electric actuator can be employed.

  In this case, the step-down DC / DC converter is an insulation step-down DC / DC converter, for example, as shown in the fourth embodiment of FIG. By adopting a configuration in which one of the wires to the power supply terminal of the low-voltage drive type electric actuator is grounded to the vehicle body of the electric vehicle, the step-down side of the isolated step-down DC / DC converter, that is, the low-voltage side is The power supply is grounded.

  Therefore, by making the wiring connection on the step-down side, which is the low voltage side of the insulated step-down DC / DC converter, longer than the wiring connection on the high-voltage input side connected to the high-voltage electric wire, the high voltage In the wiring region from the electric wire to the electric actuator, the high voltage management region can be a narrow region. In other words, the low voltage region can be widened. Therefore, it is not necessary to expand the high voltage management area.

  Further, for example, as shown in the third embodiment of FIGS. 7 and 8, the power converter, the other end of the wire, and the insulated step-down DC / DC converter are accommodated in the vehicle front chamber. You may make it provide the housing which consists of a case part to cover and the cover part which covers the opening part of the said case part, and can be opened and closed.

  According to the present invention, the high-voltage section hot-wire work can be surely prevented, so that an effect of improving the maintenance and inspection work efficiency of the electric vehicle is achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view schematically illustrating main parts and the like of an electric vehicle to which a high-voltage part hot-wire work prevention device for an electric vehicle according to an embodiment of the present invention is applied. It is a schematic diagram which shows the normal state at the time of OFF of the ignition switch of the high voltage part hot-wire work | work prevention apparatus of the electrically driven vehicle of 1st Example which concerns on this embodiment. It is a schematic diagram which shows the normal state at the time of ON of the ignition switch of the high voltage part hot-wire work prevention apparatus of the electric vehicle of 1st Example. It is a schematic diagram which shows the state in which the relay has produced the closed failure at the time of OFF of the ignition switch of the high voltage part hot-wire work prevention apparatus of the electric vehicle of 1st Example. FIG. 5A is an explanatory diagram showing an operating state of the electric actuator and a lock state of the lock mechanism. FIG. 5B is an explanatory diagram showing an unlocked state of the lock mechanism in a non-operating state of the electric actuator. It is explanatory drawing of the high voltage part hot-wire work | work prevention apparatus of the electric vehicle of 2nd Example which concerns on this embodiment. It is operation | movement explanatory drawing at the time of ON of the ignition switch of the high voltage part hot-wire work | work prevention apparatus of the electrically powered vehicle of 3rd Example which concerns on other embodiment. It is operation | movement explanatory drawing at the time of OFF of the ignition switch of the high voltage part hot-wire work | work prevention apparatus of the electrically powered vehicle of 3rd Example. It is operation | movement explanatory drawing at the time of ON of the ignition switch of the high voltage part hot-wire work | work prevention apparatus of the electrically driven vehicle of 4th Example which concerns on other embodiment. It is operation | movement explanatory drawing at the time of ON of the ignition switch of the high voltage part hot-wire work | work prevention apparatus of the electrically powered vehicle of 5th Example which concerns on other embodiment.

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

  FIG. 1 is a side view schematically illustrating main parts and the like of an electric vehicle 10 to which the high-voltage part hot-line work prevention device for an electric vehicle according to this embodiment is applied and an electric vehicle 10A according to another embodiment described later. The figure is shown.

  The electric vehicle 10 basically includes a battery 12 as a power storage device that generates a high-voltage DC voltage of about several hundred volts, and a power conversion device that converts the high-voltage DC power of the battery 12 into AC power. An inverter 14 and a motor 16 as a power generation source that is rotationally driven by the inverter 14 are provided.

  The rotational torque of the motor 16 that is rotationally driven by the inverter 14 is transmitted to the front wheels 64 via a gear box (not shown). In the electric vehicle 10 of this embodiment, the front wheels 64 are drive wheels, and the rear wheels 66 are driven wheels.

  The battery 12 employs a secondary battery such as a lithium ion battery or a nickel metal hydride battery, a capacitor, or the like, and is fixed between the lower portion of the floor 22 of the rear seat 20 b of the vehicle 18 and the underfloor panel 21.

[First embodiment]
FIG. 2 is a schematic diagram showing an electrical wiring relationship among the battery 12, the inverter 14, and the motor 16 and a configuration of the high-voltage part hot-wire work prevention device 100 for the electric vehicle according to the first embodiment.

  As shown in FIG. 2, the battery 12 is configured by connecting a sub battery 12a and a sub battery 12b in series, and can be manually opened and closed between the negative side of the sub battery 12a and the positive side of the sub battery 12b. A manual switch 26 is inserted. The manual switch 26 is opened by a service person or the like during maintenance of the inverter 14 or the like, and is returned to the closed state when the maintenance inspection is completed.

  The positive side of the sub-battery 12a is connected to one end side of the positive side (P side) relay 24p constituting the relay 24 through an electric wire 28p as a relatively short insulated power cable.

  The negative side (N side) of the sub-battery 12b is connected to one end side of the negative side relay 24n constituting the relay 24 through the electric wire 28n as a relatively short insulated power cable.

  The relay 24 is opened and closed through an ECU (electronic control unit) 70 that is a control device in response to an off-on operation by a driver or the like of an ignition switch (IG SW) 68 provided on the dashboard of the electric vehicle 10. The relay 24 is opened when the IG SW 68 is turned off (OFF), and is closed when the IG SW 68 is turned on (ON).

  The other end side of the positive side relay 24p is connected to one end side 30pa of an electric wire 30p (see also FIG. 1) which is a relatively long insulated power cable. The other end side of the negative side relay 24n is connected to one end side 30na of an electric wire 30n (see also FIG. 1), which is a relatively long insulated power cable.

  As shown in FIG. 1, the electric wires 30 (30p, 30n) pass from the relay 24 to the bottom of the hood 72 through the space between the floor 22 below the front seat 20f (driver seat and passenger seat) of the vehicle 18 and the underfloor panel 21. It is passed and wired between the inverters 14 accommodated in the vehicle front chamber 80.

  In this case, one end 30pa of the positive electric wire 30p is connected to the other end of the relay 24p, and the other end 30pb of the one electric wire 30p is connected to the DC high voltage application side of the inverter 14. Further, one end 30na of the other negative wire 30n is connected to the other end of the relay 24n, and the other end 30nb of the other wire 30n is connected to the DC high voltage application side of the inverter 14 on the end side. .

  The inverter 14 employs, for example, a three-phase full-bridge configuration using a power semiconductor such as an IGBT (insulated gate bipolar transistor), and rotates the motor 16 with a three-phase AC magnetic field.

  In the first embodiment shown in FIG. 2, the inverter 14 is housed in a housing 40 (see FIG. 2) arranged and fixed in a vehicle front chamber 80 formed in front of the driver's seat under the hood 72 of the vehicle 18. Fixed.

  The high-voltage part hot-wire work prevention device 100 for an electric vehicle according to the first embodiment basically includes a housing 40, an electric actuator 50, and a lock mechanism 45 including the electric actuator 50.

  The housing 40 includes a case part 44 formed of a rectangular parallelepiped hollow box, and a cover part 42 that covers an upper opening of the case part 44 and can be opened and closed via a hinge 46.

  The inverter 14 and the other end sides 30pb and 30nb of the electric wire 30 are accommodated in the hollow portion of the case portion 44, and locked so that the cover portion 44 does not open when a high voltage is applied to the electric wire 30. The lock mechanism 45 is accommodated.

  As will be described later with reference to FIGS. 5A and 5B, the lock mechanism 45 includes the electric actuator 50 (the rod 58 thereof) fixed to the side surface portion of the case portion 44 and the hollow portion of the case portion 42 from the cover portion 42. The key hole portion 54 is provided so as to extend to the portion side and has a hole portion 56 formed therein.

  The electric actuator 50 constituting the lock mechanism 45 basically includes a coil 52, a rod 58, a compression spring 60, and the like as shown in FIGS. 5A and 5B. As shown in FIG. When electric power is supplied from the 30 side to the coil 52 through the electric wire 32 to the power supply terminal 51 of the electric actuator 50, the rod 58 moves in the direction of arrow F against the compression spring 60 by electromagnetic force. The rod key part 58b which comprises is inserted in the hole part 56 of the key hole part 54, and the lock mechanism 45 is made into a locked state. In this locked state, the cover part 42 is fixed in a closed state, and the cover part 42 cannot be opened by a serviceman or the like.

  As shown in FIG. 5B, when the electric power through the electric wire 32 from the electric wire 30 side to the coil 52 is not supplied, a force is applied to the flange portion 58a by the compression force of the compression spring 60, and the rod 58 moves in the arrow B direction. . Thereby, the rod key part 58b which comprises the rod 58 comes out from the hole part 56 of the key hole part 54, and the lock mechanism 45 is made into an unlocked state. When the lock mechanism 45 is unlocked, the cover 42 can be opened by a serviceman or the like.

  As described above, in the high-voltage part hot-wire work prevention device 100 for the electric vehicle according to the first embodiment, the battery 12, the inverter 14, and the one end side 30pa and 30na are connected to the battery 12 side, and the other end side 30pb and 30nb. Includes an electric wire 30 (30p, 30n) connected to the inverter 14, a traveling motor 16 driven by the inverter 14, and a housing 40 (the inverter portion 14 and the other end 30pb of the electric wire 30 connected to the inverter 14). 30 nb, the electric wire 32, and the electric actuator 50, and a cover portion 42 that covers the opening of the case portion 44 and can be opened and closed by a hinge 46. A manual switch 26 inserted between the battery 12 and the inverter 14 to manually open and close the electrical connection; and the housing 4. A relay 24 (24p, 24n) that is inserted between the battery 12 and the inverter 14 and that opens and closes in conjunction with the on / off of the ignition switch 68 of the electric vehicle 10; Can be switched between a locked state that is locked by the lock mechanism 45 so that the cover part 42 is not opened and an unlocked state that allows the cover part 42 to be opened, and no power is supplied to the power supply terminal 51. An electric actuator 50 that switches the lock mechanism 45 to an unlocked state and switches the lock mechanism 45 to a locked state when power is supplied to the power supply terminal 51. The electric wire 32 passes through the electric wire 30 through the electric wire 30 from the battery 12 in the electric motor 40. It is wiring Te. The connection portion 84 between the electric wire 30 and the electric wire 32 may be in the case portion 44.

  According to the first embodiment, the electric actuator that can be switched between a locked state that prevents the cover portion 42 covering the case portion 44 that houses the inverter 14 from being opened and an unlocked state that allows the cover portion 42 to open. 50, and the power applied to the inverter 14 from the battery 12 through the electric wires 30 and 32 is branched and supplied to the power supply terminal 51 of the electric actuator 50. That is, the DC power of the battery 12 is used as the operating power source for the electric actuator 50 as it is.

  Therefore, as shown in FIG. 2, when the ignition switch 68 is in an OFF state, or when the manual switch 26 is opened by a serviceman for maintenance and inspection work (FIG. 2 is closed), the electric actuator Since no power is supplied to the 50 power terminals 51, no electromagnetic force is generated by the coil 52. Therefore, the rod 58 is moved in the arrow B direction by the compression force of the compression spring 60, the lock mechanism 45 is unlocked, and the cover portion 42 is unlocked.

  On the other hand, as shown in FIG. 3, when the ignition switch 68 is on, the relay 24 is closed and power is supplied to the power supply terminal 51 of the electric actuator 50, so that electromagnetic force generated by the coil 52 is generated. Acts on the rod 58. For this reason, the rod 58 is moved in the direction of arrow F against the compressive force of the compression spring 60, and the lock mechanism 45 is locked, so that the cover 42 is locked.

  In addition, as shown in FIG. 4, when the relay 24 has a welding failure (closed state) even when the ignition switch 68 is turned off, if the manual switch 26 is in the closed state, the electric actuator Since the power is supplied to the 50 power terminals 51, similarly, the cover mechanism 42 is kept locked by the lock mechanism 45 being locked.

  When the manual switch 26 is opened in the state of FIG. 4, power is not supplied to the power supply terminal 51 of the electric actuator 50, so the electric actuator 50 puts the lock mechanism 45 into the unlocked state.

  Therefore, in this embodiment, when electric power is supplied from the battery 12 to the inverter 14 through the electric wire 30, the cover portion 42 of the housing 40 cannot be opened, and electric power is supplied from the battery 12 to the inverter 14 through the electric wire 30. Only when not supplied, the cover part 42 of the housing 40 can be opened. Thereby, a high voltage | pressure part hot wire operation | work can be prevented reliably.

[Second Embodiment]
FIG. 6 shows a configuration of a high-voltage part hot-wire work prevention device 100A for an electric vehicle according to a second example of this embodiment.

  In the second embodiment, a step-down DC / DC converter is provided by interposing a step-down DC / DC converter 88 on the electric wire 32 connected to the electric wire 30 in the housing chamber formed by the case portion 44 of the housing 40. The power supply terminal 51a of the low voltage drive type electric actuator 50A is connected to the 88 low voltage DC output side. That is, the electric actuator 50 depicted in FIG. 2 or the like is replaced with the low voltage drive type electric actuator 50A, and the electric power from the electric wires 30 and 32 is reduced in the housing 40 via the step-down DC / DC converter 88. By adopting a configuration in which the power is supplied to the power supply terminal 51a of the actuator 50A, the range of selection of the electric actuator can be expanded, and a small electric actuator can be employed at a low cost. As the type of step-down DC / DC converter 88, any of a chopper type non-insulated DC / DC converter or an insulated DC / DC converter using a transformer can be used.

[Third embodiment]
FIG. 7 (the lock mechanism 45 is in the locked state) and FIG. 8 (the lock mechanism 45 is in the unlocked state) are applied with the high-voltage part hot-wire work prevention device 100B for the electric vehicle of the third example according to another embodiment. The structure of the electric vehicle 10A (see also FIG. 1) is shown.

  The low voltage drive type electric actuator 50A has a barrier wall 120 in front of the vehicle that blocks the vehicle front chamber 80 below the bonnet 72 to which the base of the key hole 54 of the lock mechanism 45 is attached and the vehicle compartment on the driver's seat (not shown). It is fixed to the side chamber 80 side. A low voltage power source is supplied from an insulated step-down DC / DC converter 88 provided in the housing 40 through low-voltage electric wires 110 and 112 to the power terminal 51a of the low-voltage drive type electric actuator 50A constituting the lock mechanism 45. It is wired to be supplied.

  The high-voltage part hot-wire work prevention device 100B for the electric vehicle according to the third embodiment includes a battery 12, an inverter 14, one end side 30pa, 30na connected to the battery 12, and the other end side 30pb, 30nb connected to the inverter 14. The electric wire 30 (30p, 30n), the traveling motor 16 driven by the inverter 14, and the hood 72 that covers the vehicle front chamber 80 that houses at least the inverter 14 and the other ends 30pb, 30nb of the electric wire 30; A manual switch 26 that is inserted between the battery 12 and the inverter 14 and manually opens and closes the electrical connection, and is located outside the vehicle front chamber 80, the battery 12 and the inverter. 14 is opened and closed in conjunction with the on / off of the ignition switch 68 of the electric vehicle 10A. The relay 24 (24p, 24n) and the bonnet 72 are provided on the vehicle front chamber 80 side, and the lock mechanism 45 is configured to lock the lock mechanism 45 so that the bonnet 72 does not open. Can be switched to an unlocked state that allows the power supply terminal 51a to be switched to the unlocked state when power is not supplied to the power supply terminal 51a, and can be switched to the locked state when power is supplied to the power supply terminal 51a. The voltage-driven electric actuator 50A is provided in the vehicle front chamber 80, wired so that the electric power from the electric wire 30 is supplied to the input terminal 90, and the output terminal 92 is the power supply terminal 51a of the low-voltage driven electric actuator 50A. And an isolated step-down DC / DC converter 88i connected to

  When the insulated step-down DC / DC converter 88i is used in this way, the wiring (wire) 110 and the wiring (wire) from the output terminal 92 of the insulated DC / DC converter 88i to the power supply terminal 51a of the low-voltage drive type electric actuator 50A. ) 112 (the wiring (electric wire) 112 side in FIG. 7) is grounded to the vehicle body of the electric vehicle 10A, so that the step-down side, that is, the low-voltage side of the isolated step-down DC / DC converter 88i is The power supply is grounded to the vehicle body.

  According to the third embodiment, the low-voltage drive type electric actuator that can be switched between a locked state that prevents the bonnet 72 that covers the vehicle front chamber 80 that houses the inverter 14 from being opened and an unlocked state that permits the opening. 50A is provided, and the electric power by the voltage obtained by stepping down the high voltage applied from the battery 12 to the inverter 14 through the electric wire 30 by the insulated step-down DC / DC converter 88i is used as the operation power source of the low-voltage drive type electric actuator 50A.

  When power is not supplied to the power supply terminal 51a of the low-voltage drive type electric actuator 50A, the lock mechanism 45 is unlocked and the bonnet 72 is unlocked. When power is supplied to the power supply terminal 51a of the low-voltage drive type electric actuator 50A, the lock mechanism 45 is locked and the bonnet 72 is locked. Therefore, the bonnet 72 can be opened only when power is not supplied to the inverter 14 through the electric wire 30. Thereby, a high voltage | pressure part hot wire operation | work can be prevented reliably.

  Moreover, the connection length of the step-down wirings (wires) 110 and 112 on the low-voltage side of the insulated step-down DC / DC converter 88i is set to the high-voltage input-side wire 32 connected to the high-voltage wire 30. By making the connection length longer than 32, the high voltage management region (the input terminal 90 side of the insulated DC / DC converter 88i) in the wiring region from the high voltage electric wire 30 to the low voltage drive type electric actuator 50A is provided. It can be a narrow area. In other words, the low voltage region (the output terminal 92 side of the isolated step-down DC / DC converter 88i) can be widened. Therefore, it is not necessary to expand the high voltage management area.

[Fourth embodiment]
FIG. 9 shows the configuration of a high-voltage part hot-wire work prevention device 100C for an electric vehicle of a fourth example according to another embodiment. In the fourth embodiment, the housing 40 is removed from the configuration of the third embodiment shown in FIGS. Also in this case, the connection length of the step-down wirings (wires) 110 and 112 on the low voltage side of the isolated step-down DC / DC converter 88i is set to the high voltage input side connected to the high voltage wire 30. By making it longer than the connection length of the electric wire 32, the high voltage management region (the input terminal 90 of the isolated step-down DC / DC converter 88i) in the wiring region from the high voltage electric wire 30 to the low voltage drive type electric actuator 50A. Side) can be a narrow area.

  In the third embodiment of FIGS. 7 and 8 and the fourth embodiment of FIG. 9 in which the bonnet 72 is operated integrally with the lock mechanism 45 of the vehicle front chamber 80, the insulated step-down DC / DC is used. The converter 88i may be replaced with the non-insulated DC / DC converter 88 shown in the second embodiment of FIG. However, in the alternative, the output side of the DC / DC converter 88 is floating from the vehicle body ground, and thus becomes a high voltage management region.

[Fifth embodiment]
Further, when the hood 72 operates integrally as the lock mechanism 45 of the vehicle front chamber 80, the high-voltage part hot-wire work prevention device 100D for the electric vehicle according to the fifth embodiment shown in FIG. As shown in FIG. 2, the DC / DC converter may be omitted and the electric actuator 50 may be directly wired from the electric wire 30 through the electric wire 32 as in the example of FIG.

  In another embodiment in which the bonnet 72 shown in FIGS. 7, 8, 9, and 10 is configured integrally with the lock mechanism 45, a plurality of high-voltage components are provided in the vehicle front chamber 80 below the bonnet 72. When provided, it is particularly advantageous. Examples of high-voltage components include the inverter 14 described above and a DC / DC converter (downverter) that steps down the high voltage (about several hundred [V]) to the low voltage (12 [V]) of the 12V battery. ), A charger for charging the battery 12, an air compressor of the fuel cell, and the like.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the contents described in this specification.

DESCRIPTION OF SYMBOLS 10, 10A ... Electric vehicle 12 ... Battery 12a, 12b ... Sub battery 14 ... Inverter 16 ... Motor 18 ... Vehicle 21 ... Underfloor panel 22 ... Floor 24 ... Relay 26 ... Manual switch 30, 32 ... Electric wire 40 ... Housing 42 ... Cover 44 ... Case 45 ... Locking mechanism 46 ... Hinges 50, 50A ... Electric actuator 51 ... Power supply terminal 52 ... Coil 54 ... Key hole 56 ... Hole 58 ... Rod 58a ... Flange 58b ... Rod key 68 ... Ignition switch 72 ... Bonnet 80 ... Vehicle front chamber 88 ... DC / DC converters 100, 100A to 100D ... High voltage part live-line work prevention device for electric vehicle

Claims (4)

A power storage device;
A power converter,
One end side is connected to the power storage device, and the other end side is connected to the power conversion device, and
A traveling motor driven by the power converter;
A housing composed of a case portion that houses the power conversion device and the other end of the electric wire, and a cover portion that covers an opening of the case portion and can be opened and closed;
A manual switch that is outside the housing and is inserted between the power storage device and the power converter, and manually opens and closes an electrical connection;
An outer of said housing, a relay the inserted between the power storage device and said power converter, open and close in conjunction with electrical connection Ofuon the ignition switch of the electric dynamic vehicle,
A low-voltage drive type electric actuator that is housed in the housing and can be switched between a locked state in which the cover part is locked so as not to open and an unlocked state in which the cover part is allowed to open;
A step-down DC / DC converter ,
Wire As power from the electric wire in front Symbol housing is supplied to the power supply terminal of the low voltage drive type electric actuator via the step-down DC / DC converter,
The low voltage drive type electric actuator is switched to the unlocked state when power is not supplied to the power supply terminal, and is switched to the locked state when power is supplied to the power supply terminal. The high voltage part live wire work prevention apparatus of an electric vehicle. A power storage device;
A power converter,
One end side is connected to the power storage device, and the other end side is connected to the power conversion device, and
A traveling motor driven by the power converter;
A vehicle front chamber that is formed in front of a driver's seat of the vehicle and accommodates at least the power converter and the other end of the electric wire;
A bonnet covering the upper side of the vehicle front chamber;
A manual switch that is outside the vehicle front chamber and is inserted between the power storage device and the power converter, and manually opens and closes an electrical connection;
A outside the vehicle front chamber, a relay the inserted between the power storage device and said power converter, open and close in conjunction with electrical connection Ofuon the ignition switch of the electric dynamic vehicle,
A low voltage drive type electric actuator that is provided on the vehicle front chamber side of the bonnet and can be switched between a locked state in which the bonnet is locked so as not to open and an unlocked state in which the bonnet is allowed to open;
A step-down DC / DC converter ,
Wiring so that the electric power from the electric wire is supplied to the power supply terminal of the low-voltage drive type electric actuator via the step-down DC / DC converter in the vehicle front compartment ,
The low voltage drive type electric actuator is switched to the unlocked state when power is not supplied to the power supply terminal, and is switched to the locked state when power is supplied to the power supply terminal. The high voltage part live wire work prevention apparatus of an electric vehicle. In the high voltage part active work prevention apparatus of the electric vehicle of Claim 2 ,
The step-down DC / DC converter is an isolated step-down DC / DC converter,
One of the wires from the insulated step-down DC / DC converter to the power supply terminal of the low-voltage drive type electric actuator is grounded to the vehicle body of the electric vehicle. apparatus. In the high voltage part hot-wire work prevention apparatus of the electric vehicle of Claim 3 ,
Furthermore, a case part that accommodates the power converter, the other end of the electric wire, and the insulated step-down DC / DC converter in the vehicle front compartment, and a cover that covers the opening of the case part and that can be opened and closed And a high-voltage live-line work prevention device for an electric vehicle, characterized by comprising:

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