JPH0368623B2 - - Google Patents

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 multiple models of conventionally used models are combined and connected to operate in parallel with one battery (for example, Utility Model Laid-Open No. 53-47517 and Japanese Patent Laid-Open No. 58-179123). )
It has been known.

[Problem that the invention seeks to solve]

However, in the above-mentioned known example, basically, as shown in FIG. 2, a plurality of alternators _G1 and _G2 (two in FIG. 2 is illustrated) are connected to special circuits _C1 and C, respectively. ₂ and is connected to one bus BL.

Therefore, the load circuit is all connected to one bus BL.
The main fuse MF ₀ and the shunt Sh ₀ are connected in series between the bus BL and the battery B ₁ , so they are required to have a large capacity.

In other words, in the circuit shown in Figure 2, the main fuse
The sum of the respective maximum generated currents of alternators G ₁ and G ₂ may flow through MF ₀ and shunt Sh ₀ . The capacity of the largest existing alternator model is
Since it is 4Kw, when two of these alternators are operated in parallel, the main fuse is
Since a current of 300 amperes or more corresponding to 8Kw flows through the MF ₀ and shunt shunt Sh ₀ , it is not only a problem to deal with the excessive amount of heat generated in the shunt, but also the circuit components and mounting materials are expensive. There was a drawback that I had to use .

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. and a branch terminal connected to the output terminal of the alternator and a terminal of the battery, respectively, and a battery relay contact for each alternator is provided between the branch terminal and the output terminal of the alternator, respectively.
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.

A branch terminal is provided in the battery room.

[Effect]

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 circuit, and the main fuse, shunt, battery relay contact, etc. are connected in series to this main circuit. 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 provided in the battery room, all equipment other than the battery and the fitting materials between the battery branch terminals must be of conventional standards and used under the conventional thermal conditions. I can do it.

〔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 ₁ and G ₂ of the largest capacity among the conventional types. Batteries _B2 are of large capacity and are connected in parallel.
The large number of load circuits are divided into two systems as shown by symbols L ₂₁ to L ₂₃ and L ₃₁ to _33, respectively, and output terminals TB ₁ and TB of alternators G ₁ and G ₂ , respectively.
Connected directly to TB ₂ . The code TB is battery B ₂
indicates the branch terminal on the output side _of the
MF ₂ indicates the main fuse, symbols Sh ₁ and Sh ₂
shows the shunt of ammeter A ₂ . All of these are existing formats.

Here, the feature of the present invention is that the large number of load circuits L ₂₁ to _{L 23} and L ₃₁ to ₃₃ are divided into a number equal to the number of alternators, that is, into two systems, and each output terminal TS ₁ of the alternator is divided into two systems. and TS ₂ directly connected to this respective output terminal and a branch terminal connected to the output side of battery B ₂
Between the TB and the battery relay Bry ₁ ,
Each contact of Bry ₂ , main fuses MF ₁ and MF ₂ , and shunts Sh ₁ and Sh ₂ of ammeter A ₂ are connected to form a series circuit, respectively. moreover,
The sum value including the direction of the current passing through the shunts Sh ₁ and Sh ₂ is displayed on the ammeter A ₂ .

In this configuration, the power generated by alternator G ₁ is directly supplied to load circuits L ₂₁ - _{L 23} via output terminal TB ₁ , and the power generated by alternator G ₂ is output to load circuits L ₃₁ - ₃₃ . Supplied directly via terminal TB ₂ . In other words, under steady operating conditions,
The current reaching the branch terminal TB via the shunt Sh ₁ or Sh ₂ is small. Therefore the flow divider
The heat generated in Sh ₁ , Sh ₂ , fuses MF ₁ , MF ₂ and battery relays BRy ₁ , BRy ₂ is small. 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 will replenish this power, but in this case as well, two divided currents will flow through the fuse or shunt, so the capacity will be reduced. A small existing one will suffice.

However, even if a situation occurs in which the load circuits L ₂₁ to _{L 23} in the upper system become extremely large and the loads L ₃₁ to ₃₃ in the lower stage become light, most of the load current in the upper stage will flow through the output terminal TB ₁ . and from the output terminal TB ₂ ,
The current flowing to the output terminal TB ₁ via the branch terminal TB 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 Sh ₁ and Sh ₂ , including their respective directions, is displayed on the ammeter A _2. This display allows the driver to check the charging and discharging of the battery at that point. It can be easily observed.

In this configuration, large-capacity components are connected to branch terminal TB.
and only 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 existing models with the maximum capacity, but depending on the state of each load, two or more alternators with different capacities may be used. The present invention can also be carried out by appropriately combining these.

〔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 ₁ , A ₂ ... Ammeter, B ₁ , B ₂ ... Battery,
BL...Bus bar, BRy ₁ , BRy ₂ ...Battery relay,
C ₁ , C ₂ ...Special circuit, F ₁₁ ~ F ₁₃ , F ₂₁ ~ F ₂₃ ,
_F31 ~ _F33 ...Fuse, _G1 ~ _G2 ...Alternator, KS...Key switch, _L11 ~ _L13 , _L21 ~ _L23 ,
L ₃₁ to _{L 33} ... Load circuit, MF ₀ to _{MF 2} ... Main fuse, Sh ₀ to _{Sh 2} ... Shunt switch, TB ... Branch terminal,
TB ₁ , TB ₂ ...Output terminal, W...Lead wire.

Claims (1)

[Claims] 1. In 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, the large number of load circuits have a number equal to the number of alternators. The system is divided into branch terminals that are connected to the output terminal of the alternator and the terminal of the battery, and between this branch terminal and the output terminal of the alternator, there is a battery A series circuit of a relay contact, a fuse, and an ammeter shunt is connected to the ammeter, which displays the sum of the currents passing through the ammeter shunt. Automotive power supply circuit. 2. The automotive power supply circuit according to claim 1, wherein the branch terminal is provided in the battery room.