JPH0467633B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power supply circuit equipped with an ammeter circuit for displaying the full load current of an automobile, and particularly to a power supply circuit that is installed in the driver's seat of a large vehicle such as a bus. A single ammeter is used to display the current in a power supply circuit equipped with multiple alternators.

[Conventional technology]

In the power supply circuit of an automobile, as shown in Fig. 3, the output of an alternator G ₁ is connected in parallel with loads L ₁₁ to L ₁₃ for each system, which are connected via individual fuses F ₁₁ to F ₁₃ , respectively. The terminal is connected to the output terminal of the battery B ₁ via a circuit in which the contacts of the battery relay BRy ₁ , the main fuse MF ₁ , and the shunt Sh ₁ of the ammeter A ₁ are connected in series.

Recently, automobiles have been equipped with various devices to improve safety and livability, and the capacity of batteries and alternators has increased to meet this load power, but this demand is especially significant for large buses. . However, changing the alternator to a model with higher output increases the size and weight of the alternator, and it is actually difficult to install it in a car with limited vehicle body dimensions. A common practice is to connect multiple alternators to a battery for so-called parallel operation.

[Problem to be solved by the invention] However, in this case, a large current flows through the shunt of one ammeter that displays the charging and discharging current of one battery with multiple alternators connected in parallel. However, because it uses a current shunt for large currents, it has the disadvantage of a significant temperature rise. If this current is displayed for each of a plurality of systems, it is not possible to appropriately display battery charging and discharging to the driver.

The object of the present invention is to provide a power supply circuit for an automobile that solves this drawback.

[Means for solving problems]

The present invention includes a plurality of alternators, a battery connected to output terminals of the plurality of alternators via a branch circuit and respective battery relays, and charged with output power of the plurality of alternators; A shunt is inserted between each output terminal of the battery relay and the battery relay, and a charge/discharge ammeter is connected to each shunt and displays the total load current of the power supply circuit. A load corresponding to the capacity of each alternator is connected in parallel to the output terminal of the alternator, and the ammeter has a number of windings corresponding to the number of shunts arranged in a harmonic winding, and the voltage terminal of each shunt are respectively connected to this winding.

[Effect]

Each output terminal of the plurality of alternators is connected to a load, and is also connected to one battery to charge the battery. Further, shunt currents from a plurality of shunts connected in series to each output terminal of the alternator are sent to one ammeter. This ammeter is equipped with a number of coils corresponding to the number of current shunts, and the directions of the magnetomotive forces of these coils are set to be in the same direction, that is, to form a parallel sum winding. It has been done. Therefore, the pointer of the ammeter can indicate the sum of the charging and discharging currents flowing through the plurality of shunts.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the present invention. In Figure 1, two alternators G ₂
and G ₃ are output terminals TB ₂ and TB ₃ respectively
This terminal is connected to the branch terminal TB ₄ , which is the output of the large capacity battery B ₂ . Loads L ₂₁ to L 23 and _{L 31 to} L ₃₃ corresponding to the capacities of alternators G ₂ and G ₃ , respectively, are connected to the output terminals TB ₂ and TB ₃ via segment fuses F ₂₁ to _{F 23} and F ₃₁ to F ₃₃ , respectively. connected.

Between branch terminal TB ₄ and each output terminal TB ₂ and TB ₃ there are contacts of battery relays BRy ₂ and BRy ₃ , main fuses MF ₂ and MF ₃ and shunt as main circuit of alternators G ₂ and G _3, respectively. The vessels Sh ₂ and Sh ₃ are connected in cascade. The alternators G ₂ and G ₃ are of a known type and are configured such that an AC output is passed through a rectifier circuit to obtain a DC output. Their capacities may be different or the same. Therefore, each battery relay, main fuse, and shunt can all be of known type.

Here, the feature of the present invention is that, as mentioned above, each of the output terminals TB ₂ and TB ₃ of a plurality of alternators, that is, two alternators, and the branch terminal TB ₄ of the battery.
Two current shunts Sh ₂ and Sh ₃ are inserted between the two, and the current shunted by these shunts is connected to the two coils of one ammeter A ₂ ,
Moreover, this ammeter is constructed from a power supply circuit for an automobile, which is equipped with coils that are connected in parallel and have a summation winding.

FIG. 2 is a perspective view showing the main parts of the ammeter according to the present invention. The pointer N of the ammeter is horizontally supported by a balancer Bl and a movable magnet MM fixed to a pointer shaft NS so as to be rotatable by a bearing Be. Two shunts Sh ₂ and Sh ₃ shown in FIG.
The relay terminals J ₂ , J ₂ ′ and J ₃ , J ₃ ′ of the respective branch terminals are connected to the coils C ₁ and C ₂ of FIG.
are connected to the respective terminals of the

Here in FIG. 1, the direction of the direct current across the shunt Sh ₂ is between the output of the alternator G ₂ and the load L ₂₁ connected to this alternator G ₂ .
It is determined by the difference in magnitude from the sum of the inputs of L ₂₃ ,
The battery discharging current or charging current flows through the shunt Sh ₂ . Similarly, a discharging current or a charging current flows through the shunt Sh ₃ depending on the difference between the output of the alternator G ₃ and the sum of the inputs of the loads L ₃₁ to _{L 33} .

Each of the coils C ₁ and C ₂ has the above shunt
Two shunt currents Sh ₂ and Sh ₃ flow, and the coils C ₁ and C ₂ are wound in parallel in a sum-motion winding manner. Therefore, this ammeter displays the sum including the two current directions. The pointer N of the ammeter swings to the right or left due to the resultant force that takes into account the directionality of the magnetomotive force generated in the two coils,
The driver can immediately identify whether the battery B ₂ is being discharged or charged at that time, and the amount of current is positive or negative.

By appropriately selecting alternators G ₂ and G ₃ shown in FIG. 1 from existing types, the alternator, shunt, and other parts can be used as conventional parts, resulting in low cost. Furthermore, since the operating standards remain the same as before, there is no risk of temperature rise. Further, the coils C ₁ and C ₂ of the ammeter can also be constructed by using conventional coils and adjusting the balancer.

Although the number of alternators is two in this embodiment, the present invention is not limited to this.

〔Effect of the invention〕

According to the present invention, even if the battery capacity of an automobile increases, the shunts for one ammeter are provided in a distributed manner, so that an automobile power supply circuit equipped with an ammeter that does not have the problem of temperature rise can be configured. In addition, it is possible to use conventional electrical components and outfitting materials that are inexpensive and have good compatibility through mass production.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of essential parts of an ammeter according to the present invention.
FIG. 3 is a block diagram of a conventional automobile power supply circuit. A ₁ , A ₂ ... ammeter, B ₁ , B ₂ ... battery, Be ... bearing, Bl ... balancer, BRy ₁ ~ BRy ₃ ... battery relay, F ₁₁ ~ F ₁₃ , F ₂₁ ~ F ₂₃ , F ₃₁ ~ F ₃₃ ...Division fuse, _G1 to _G3 ...Alternator, _J2 , _J2 ', _J3 , _J3 '...
Lead terminal, L ₁₁ - _{L 13} , L ₂₁ - L ₂₃ , L ₃₁ - L ₃₃ ... load, MF ₁ - MF ₃ ... main fuse, Sh ₁ - Sh ₃ ... shunt, TB ₁ - TB ₃ ... output terminal, TB ₄ ...Branch terminal.

Claims (1)

[Scope of Claims] 1. A plurality of alternators; a battery connected to the output terminals of the plurality of alternators via a branch circuit and each battery relay, and charged with the output power of the plurality of alternators; A current divider inserted between each output terminal of a plurality of alternators and the battery relay, and one charging/discharging ammeter connected to each of the current shunts and displaying the total load current of this power supply circuit, A load corresponding to the capacity of each alternator is connected in parallel to the output terminals of the plurality of alternators, and the ammeter has a number of windings corresponding to the number of shunts arranged in a summation winding. An automotive power supply circuit characterized in that voltage terminals of are connected to the windings.