JPS61196734A - Power source circuit for automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a DC power supply circuit for a large vehicle that consumes a large amount of power, and is particularly applicable to a power supply circuit for a large bus equipped with two or more alternators. .

[Conventional technology]

In order to improve the safety and livability of automobiles, the power consumption of automobiles is increasing more and more, and the demand for large buses is particularly significant. Power for automobiles is supplied by a battery and an alternator, which is a combination of an alternator driven by the engine and a semiconductor rectifier circuit, but the increase in battery capacity has been relatively slow in response to the above-mentioned demand for increased power consumption. can be easily dealt with. However, designing and manufacturing an alternator model with a new capacity not only increases costs, but also creates problems in distribution and maintenance measures such as replenishment of replacement spare parts.

An example of an alternator in which a plurality of conventionally used models are combined and connected to operate in parallel for one Pa-noteri (for example, the
517 and JP-A-58-179123) are known.

[Problem that the invention seeks to solve]

However, as shown in FIG. 2, the above-mentioned known example is basically:
A plurality of alternators G1 and G2 (two in FIG. 2) are connected to one bus BL with special circuits C8 and C2, respectively.

Therefore, all the load circuits are one bus BT.

It is thought that the main fuse MF
, and the shunt S h o connects the bus BL and the battery B
1, so a large capacity is required.

That is, in the circuit of FIG. 2, the main fuse M F o,
The sum of the maximum currents generated by alternators G1 and G2 may flow through the shunt S ho.

The maximum capacity of existing alternators is 4ktv, so if two of these alternators are operated in parallel, a current of 300 amperes or more corresponding to 8kw will flow through the main fuse MF and shunt Sho as explained above. Therefore, not only is there a problem of countermeasures against the excessive amount of heat generated in the shunt, but there is also the drawback that expensive circuit components and mounting materials must be used.

An object of the present invention is to solve this problem and provide a power supply circuit for an automobile that can use a shunt with a small amount of heat dissipation and existing inexpensive components and mounting materials.

[Means for solving problems]

The present invention provides an automotive power supply circuit that includes a plurality of alternators and one battery system and supplies power to a large number of load circuits, wherein the large number of load circuits are divided into a number of systems equal to the number of alternators. branch terminals connected to the output terminals of the alternators and to the terminals of the battery, and between the branch terminals and the output terminals of the alternator, a battery relay contact for each alternator; The present invention is characterized by comprising an ammeter connected to a series circuit of a fuse and a shunt for an ammeter, and displaying the sum of the currents passing through the shunt for the ammeter.

The branch terminal is provided inside the battery room.

[For production]

For each load in a car, each load circuit is divided into the same number as the number of conventional alternators installed, and is systematically connected by type. They are divided according to the capacity of the alternator. These are combined into one circuit and connected in parallel to the main line, and the main fuse, shunt, battery relay contact, etc. are connected in series to this main line.

The shunt currents of the plurality of shunts are added and displayed on one ammeter. Furthermore, since the above-mentioned main line is connected to the battery branch terminals installed in the battery room, all materials other than the battery and the mounting material between the battery branch terminals are of conventional standards and are used under the conventional thermal conditions. be able to.

〔Example〕

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

FIG. 1 shows a block diagram of an embodiment of the present invention. FIG. 1 uses two identical alternators G and G2, which have the largest capacity among conventional types. Batteries B2 are connected in parallel and have a large capacity.

A large number of load circuits are designated by symbols L21 to LL3 and L31 to,
3, each is divided into two systems, and the output terminals TB1 and TB of alternators G1 and G2, respectively.
2. The symbol TB indicates the branch terminal on the output side of the battery B2, the symbols kI F + and MF2 indicate the main fuse, and the symbols ShI and Sb2 indicate the shunt of the ammeter A2. All of these are existing formats.

Here, the present invention is characterized in that the large number of load circuits L21 to Lza and L31 to 3 are divided into a number equal to the number of alternators, that is, divided into two systems, each having an output terminal TS of the alternator.

and T S 2, and a branch terminal T connected to this respective output terminal and to the output side of battery B2.
Between B and B, there are battery relays BRy+ and B, respectively.
Each contact point of Ryz, main fuse MF.

The shunt 5hIXSh2 of M F 2 and ammeter A2 are each connected to form a series circuit. Further, the sum value including the direction of the current passing through the shunts Sh0 and Sb2 is displayed on the ammeter A2.

In this configuration, power generated by alternator G1 is directly supplied to load circuits LSI to L23 via output terminal TB, and power generated by alternator G2 is directly supplied to load circuits LSI to LSI to L23 via output terminal TB2. Supplied. That is, in a steady state of operation, the current that reaches the branch terminal TB via the shunt shunt Sh1 or Sb2 is small. Therefore, shunts Sh+, Shz, fuse MF
', MF2 and battery relay BRV+, BR3
'2 generates very little heat. All of these components can be implemented using existing small thermal capacity components to implement a small thermal design.

If the load exceeds the power generated by the alternator during operation, battery B2 supplies this power, but even in this case, the current divided into two flows through the fuse or shunt, so the battery B2 has a small capacity. The existing one will suffice.

On the other hand, even if a situation occurs in which the load circuits L21 to L23 in the upper system become extremely large and the loads l-1) to 33 in the lower stage become light, most of the load current in the upper stage is transferred to the output terminal T.
B, from the output terminal TB2 to the branch terminal T
The current flowing to the output terminal TB via B becomes smaller. In this case as well, each component may be an existing one with a small capacity.

In addition, the sum of the currents passing through the two shunts S L+ and Sb2, including their respective directions, is displayed on the ammeter A2, so this display makes it easy for the driver to charge and discharge the battery at that point. can be observed at the hospital.

In this configuration, the only large-capacity components are the branch terminal TB and the lead wire W. Since this branch terminal TB is provided in the battery room, the lead wire W is extremely short. In addition, large-capacity terminals and lead wires can be easily obtained, and both are inexpensive. All other parts can be made of existing inexpensive and widely used components and mounting materials, and the shunt is not likely to generate heat.

In the above embodiment, it was explained that the two alternators were both of the maximum capacity of the existing model, but
Depending on the state of each load, the present invention can be practiced by appropriately combining two or more models with different capacities.

〔Effect of the invention〕

According to the present invention, there is an effect that an automobile power supply device that can handle large-capacity load input and has good safety and maintainability can be constructed at a low cost using existing parts.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of a conventional device. A, ,A2...Ammeter, B, ,B2...Battery, BL...Bus bar, l13Ryl, BRyz...
Battery relay, C+, Cz...special circuit, FI
I ” F l 3, F21~Ft3, F31~F3
ff...fuse, 01~G2...alternator,
KS...Key switch, L, ~L13, L21~L2
3. L31 to L33...Load circuit, MF, ~MF2・
...Chief Hughes, S ho ”' S h z...
Shunt switch, TB... Branch terminal, TB, , TB2...
Output terminal, W...lead wire.

Claims (2)

[Claims] (1) In an automotive power supply circuit that includes multiple alternators and one battery system and supplies power to a large number of load circuits, the large number of load circuits are divided into a number of systems equal to the number of alternators. A branch terminal is provided which is connected to the output terminal of the alternator and a terminal of the battery, and a battery relay contact is provided for each alternator between the branch terminal and the output terminal of the alternator. A power supply circuit for an automobile, characterized in that a series circuit of a fuse and a shunt for an ammeter is connected, and an ammeter is provided that displays the value of the sum of the currents passing through the shunt for the ammeter. . (2) The automobile power supply circuit according to claim (1), wherein the branch terminal is provided in the battery room.