JPH0295103A - Power source of electric device for vehicle - Google Patents

Abstract

PURPOSE:To prevent an electric device from burning or undergoing a trouble due to an overvoltage by disconnecting the output terminal of a generator from that of a storage battery by a high voltage automatic cutoff switch, and connecting the electric device of a vehicle to the battery. CONSTITUTION:If a generator 1 generates a very high voltage at its output terminal 2 due to the trouble of a regulator 4, a field coil or a field terminal 3, a high voltage switch 5 is operated. Thus, it can prevent various types of electric devices 9 from undergoing a trouble or a storage battery 10 from burning. Since the battery 10 which generates no high voltage is simultaneously used to continue the service of a bus at that time, the bus can be driven to a suitable destination without stopping the operation on the way. The switch 5 is automatically reset if a bus driving engine is stopped to eliminate the voltage of the intermediate output terminal 16 of the generator 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, electric devices in vehicles have frequently failed due to voltage instability. In particular, large power generation equipment such as large power passes are operated by large engines whose rotation is not fixed, so even if there is a slight failure in the voltage control circuit of the power generation equipment, the power supply voltage of the electrical equipment in the power generation equipment will change significantly, resulting in a large number of expensive electrical equipment. This caused burnout and malfunction.

For this reason, in the past, electrical devices that could safely and reliably operate from very high voltages to very low voltages were required, and these devices had to be extremely expensive.

In the past, various devices have been developed to protect electrical devices in vehicles from overvoltage, but they have various drawbacks and few have been put into practical use.

The present invention solves the problems of the prior art and completes a useful power source for a vehicle electrical device.

Hereinafter, an embodiment in which the present invention is utilized as a power source for an electric device of a large-sized pass vehicle will be illustrated and its operation will be explained.

In the figure, (1) is the generator that is linked to the engine for running the pass (hereinafter referred to as "TaJ"), and (2) is the output terminal (3).
) is the field coil terminal, (16) is the intermediate output terminal, (17) is the negative output terminal, (4) is the regulator, and C3) 1 large high voltage automatic disconnect switch (hereinafter referred to as high voltage switch). If the voltage to the various electrical devices (9) on the path is too high A, the storage battery (10) and generator (
This is a device that disconnects the output terminal (2) of 1). If an extremely high voltage is generated at the output terminal (2) of the generator (1) due to a failure of the regulator (4) or failure of the field coil or field terminal (3), the high voltage switch (5) will operate and various Prevent burnout and failure of electrical equipment (9) and storage batteries (10).At the same time, storage batteries (10) that do not generate high voltage.
It is also very useful because it allows you to continue driving on the path for the time being using the , allowing you to drive to an appropriate destination without stopping mid-way. The high voltage switch shown in the drawing (
To explain the parts 5), (6) is an electromagnetic relay switch whose contacts are in a disconnected state when the voltage is high. The electromagnetic relay switch (6) is controlled by a transistor.

(7) (13) The symbols in (14) are the HPN transistor (8), the PNP transistor (11) is the Zener diode, and (12) the resistor (15) is the capacitor. The high voltage switch (5) is activated when the pass running engine is stopped and the intermediate output terminal (16) of the generator (1) is activated.
) will automatically return when the voltage is removed, but the disconnected state will remain until then.

[Brief explanation of drawings]

The drawing shows an example of an electrical connection diagram according to an embodiment of the present invention.

Claims (1)

[Claims] A power source for a vehicle's electrical device, characterized in that the output terminal of the vehicle's power generation device and the output terminal of the storage battery are disconnected by a high-voltage automatic cut-off switch, and the vehicle's electrical device is connected to the storage battery side.