JP2007168742A - Power supply device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power source device for a vehicle capable of making the vehicle travel even in the case that a dark current cutting switch is turned off due to a failure. <P>SOLUTION: In this power source device for a vehicle having a main power source 2, a starter motor 3, an alternator 4 and a power load 5, the power load 5 is connected to the downstream side of the main power source 2 and the starter motor 3, and the alternator 4 is connected to the upstream side of the power load 5 and the downstream side of the main power source 2 and the starter motor 3, and the dark current cutting switch 6 is provided on the upstream side of the alternator 4 and the downstream side of the main power source 2 and the starter motor 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply device for a vehicle including a dark current cut switch that blocks a main power supply and an electric power load during parking, and blocks current consumption during parking, that is, dark current.

As a power supply device for a vehicle, for example, there is a device described in Patent Document 1, and as shown in FIG. 3, a dark current cut switch 51 is provided between a main power supply 52 (battery) and a power load 53. Thus, during parking, the main power supply 52 and the power load 53 are interrupted to interrupt dark current during parking, thereby preventing wasteful consumption of the stored power of the main power supply 52 and, consequently, battery exhaustion. A starter motor 54 and an alternator 55 are connected to the positive side of the main power supply 52.
Japanese Patent Laid-Open No. 10-70843

  However, since the dark current cut switch 51 is provided on the downstream side of the alternator 55 in such a vehicle power supply device, when the dark current cut switch 51 becomes an off failure, the alternator 55 supplies the power load 53. For example, an electric power steering device (EPS), a light, a wiper, etc. There was a problem that would become difficult.

  In view of the above problems, an object of the present invention is to provide a power supply device for a vehicle that enables the vehicle to travel even when the dark current cut switch has an off failure.

In order to solve the above problems, a power supply device for a vehicle according to the present invention includes:
In a power supply device for a vehicle having a main power source, a starter motor, an alternator, and a power load,
The power load is connected to the downstream side of the main power source and the starter motor, the alternator is connected to the upstream side of the power load and the downstream side of the main power source and the starter motor, and a dark current cut switch is connected to the alternator. And upstream of the main power source and the starter motor.

  Here, it is preferable that the electric power load is an electric power load essential for traveling of the vehicle.

  According to the present invention, even when the dark current cut switch has an off failure, the electric power generated by the alternator can be supplied to the electric power load, so that the vehicle can travel.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a circuit diagram showing an embodiment of a power supply device for a vehicle according to the present invention.

  A power supply device 1 for a vehicle according to this embodiment includes a battery 2 as a main power source, a starter motor 3, an alternator 4, and a power load 5.

  The power load 5 is connected to the downstream side of the battery 2 and the starter motor 3, and the alternator 4 is connected to the upstream side of the power load 5 a essential for traveling of the vehicle and the downstream side of the battery 2 and the starter motor 3. In addition, a dark current cut switch 6 is provided on the upstream side of the alternator 4 and on the downstream side of the battery 2 and the starter motor 3.

  In addition, 5b shows the electric power load which is not essential for driving | running | working of a vehicle, 7 shows the non-fuse breaker of the alternator 4, and the upstream shows the positive electrode side of the battery 2. FIG. The power load 5a indicates a load such as an electric power steering device (EPS), a light, and a wiper.

  According to this, even when the dark current cut switch 6 is turned off, the starter motor 3 is started by the battery 2, the engine (not shown) is started, and power is generated by the alternator 4 driven by the engine. The electric power can be supplied to the electric power load 5a essential for traveling of the vehicle, thereby preventing the vehicle from becoming difficult to travel. That is, even if the dark current cut switch 6 breaks down during traveling, the alternator 4 supplies power to the power load 5 that is essential for traveling, so that there is no problem in traveling.

  Of course, instead of the configuration shown in FIG. 1, the following configuration may be adopted.

  FIG. 2 is a circuit diagram showing another embodiment of the power supply device for a vehicle according to the present invention.

  The vehicle power supply device 1 of the present embodiment also includes a battery 2 as a main power source, a starter motor 3, an alternator 4, and an electric power load 5.

  The power load 5 is connected to the downstream side of the battery 2 and the starter motor 3, the alternator 4 is connected to the upstream side of the power load 5 and the downstream side of the battery 2 and the starter motor 3, and the dark current cut switch 6 is connected to the alternator 4. Provided on the upstream side and on the downstream side of the battery 2 and the starter motor 3. The difference from the embodiment shown in FIG. 1 is that a power load 5 b that is not essential for traveling of the vehicle is also connected to the downstream side of the alternator 4.

  In this case as well, when the dark current cut switch 6 is turned off, the starter motor 3 is started by the battery 2, the engine (not shown) is started, and power is generated by the alternator 4 driven by the engine. Thus, the electric power can be supplied to the electric power load 5a essential for traveling of the vehicle, thereby preventing the vehicle from becoming difficult to travel.

  However, in this configuration, since the power load 5b that is not essential for vehicle travel is also connected downstream of the non-fuse breaker 7 of the alternator 4, the breaking capacity of the non-fuse breaker 7 must be increased. The embodiment shown in FIG. 1 is preferred.

  In any of the embodiments shown in FIGS. 1 and 2, since the dark current cut switch 6 is provided on the downstream side of the positive electrode side of the battery 2, the starter motor 3 is activated by the power of the battery 2. Therefore, the rating of the dark current cut switch 6 can be reduced.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

1 is a circuit diagram showing an embodiment of a power supply device for a vehicle according to the present invention. It is a circuit diagram which shows the other Example of the power supply device of the vehicle by this invention. It is a circuit diagram which shows the power supply device of the conventional vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply device of a vehicle 2 Battery 3 Starter motor 4 Alternator 5 Electric power load 5a Electric power load essential for driving | running | working of a vehicle 5b Electric power load not essential for driving | running | working of a vehicle 6 Dark current cut switch 7 Non-fuse breaker

Claims (2)

In a power supply device for a vehicle having a main power source, a starter motor, an alternator, and a power load,
The power load is connected to the downstream side of the main power source and the starter motor, the alternator is connected to the upstream side of the power load and the downstream side of the main power source and the starter motor, and a dark current cut switch is connected to the alternator. A power supply device for a vehicle, wherein the power supply device is provided upstream of the main power source and downstream of the starter motor. The power supply device for a vehicle according to claim 1, wherein the power load is a power load essential for traveling of the vehicle.

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