JPH048120A - Power supply system - Google Patents

Abstract

PURPOSE:To avoid the overdischarge of a battery and supply a stable power by a method wherein the operations of a plurality of electrical apparatuses are so controlled as to have the summation of the respective currents of the electrical apparatus limited to a predetermined value. CONSTITUTION:A controller 13 sums up respective currents detected by current detectors 14 provided on the input sides of respective electrical apparatus and controls the total current so as not to exceed a predetermined value. As the current detectors are connected to the respective apparatuses, the controller 13 can monitor which apparatuses are in operation. Therefore, mistaken machine control wherein, whenever temporary current declines occur in the apparatus such as an air-conditioner 9 in which an air-compressor is turned on and off, the other machines are turned on and off can be avoided. Thus, as the total power consumption is suppressed to a certain value or less, the overdischarge of a battery 6 caused by excessive operations of the electrical apparatuses can be avoided and the life and the reliability of a power supply system can be improved.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a power supply system equipped with a battery and a generator using an internal combustion engine, and particularly relates to a power supply system that is loaded with a plurality of electrical devices that consume large amounts of power, such as high-frequency heating devices. related to system.

BACKGROUND OF THE INVENTION Conventionally, various devices have been developed that are compatible with DC power supply systems that are equipped with power generators powered by internal combustion engines such as cars, and storage batteries.

Among them, air conditioners and heating equipment are devices that consume a particularly large amount of current. Furthermore, in recent years, many electrical devices such as AV equipment, fax machines, and radio equipment have been installed in cars and other vehicles. In line with these usage conditions, the capacity of power supply systems that combine generators and IIs with batteries is increasing year by year.

FIG. 3 shows the configuration of a conventional power supply system. In FIG. 3, a battery 1 and a generator 2 driven by an internal combustion engine are connected in parallel to form a direct 2-item electric generator fi3.

When the battery 7 is consumed by using electrical equipment, the charging function of the generator 2 is activated.

Electrical devices such as a microwave oven, an air conditioner, and a car stereo are connected in parallel to the output of the battery 1, and each obtains energy to operate the device.

Problems to be Solved by the Invention However, with this type of structure, when multiple electrical devices are used and the power consumption exceeds the capacity of the generator for a long time, the battery consumption becomes too large and over-discharge occurs. There was an issue that led to this.

There is a problem that over-discharging conditions significantly shorten the life of the battery.

Furthermore, when a device exceeding the power supply capacity is connected, there is a problem that the operation of the device becomes unstable due to a drop in the power supply voltage.

Therefore, the first object of the present invention is to provide a power supply system that can supply stable power without over-discharging the battery.

A second object is to obtain a power supply system that does not cause over-discharge of the battery and reduces restrictions on the use of electrical equipment.

Means for Solving the Problems In order to achieve the above-mentioned first object, the present invention provides an internal combustion engine, a power source composed of a battery and a generator powered by the internal combustion engine, and a power source that supplies electric power from the power source. and a control device that controls the operation of the electrical devices, the control device controlling the operations of the electrical devices so that the sum of currents of the plurality of electrical devices is equal to or less than a predetermined value. It is configured to do this.

Furthermore, in order to achieve the second objective, a configuration is adopted in which a plurality of electrical devices are prioritized and the operation of the devices is suppressed in order starting from the lowest priority so that the total current becomes less than a predetermined value. It is.

Function: The power supply system of the present invention includes control devices for a plurality of electrical devices, and controls the total current so that it is below a predetermined value, so there is no over-discharge of the battery and I! This prevents inconveniences in device operation and does not reduce battery life.

Furthermore, since current is limited by prioritizing multiple electrical devices, there are fewer restrictions on the use of electrical devices. For example, rather than heating equipment that has little effect even if it is stopped for a short time,
By giving a high priority to the microwave oven, which is only used for a short time, it is possible to obtain a power supply system that can be used without any practical inconvenience for both appliances.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 shows a circuit diagram of the Igi source system of the present invention.

A DC power source 4 is connected in parallel to a generator 5 using an internal combustion engine and a battery 6 to form an electric power source 7. A switch 8 is provided between the generator 5 and the battery 6, and the switch is turned on to charge the battery 6 while the internal combustion engine is operating.

The power supply 7 has an air conditioner 9. Stere No. 10. microwave oven 1
1. Each electrical device of the telephone 12 is connected.

The control device 13 adds and calculates the currents of the current detectors 14 provided at the inputs of each electrical device, and controls the currents so as not to exceed a predetermined value. Since a current detector is connected to each device, the control device can monitor which devices are in operation. For this reason, in devices such as air conditioners where the compressor is turned on and off, a temporary decrease in current occurs, but it is possible to prevent incorrect device control such as turning on and off other devices each time.

In this way, since the overall power consumption is kept below a certain level, over-discharge of the battery 6, which occurs due to overuse of electric appliances, can be prevented, and the life and reliability of the power supply system are significantly improved. .

FIG. 2 shows a flow chart of the control system of the power supply system of the present invention.

First, t-flow detection is performed for each device, and addition operations are performed for each. Conditions are divided into cases in which the total current exceeds a predetermined value and cases in which it does not, and control is performed so that the total current consumption of each electrical device does not exceed a predetermined value.

At this time, a priority order is set for each device, and the operation and stop of the device is controlled according to the priority order. For example, in the case of a passenger car's power supply system, if the most necessary devices, such as lights and defrosting windows, are given a high priority, they will not stop working when you try to turn them on.

Also, if you lower the priority of devices such as air conditioners and heating equipment that will not have a big impact even if they are stopped for a short time, and give higher priority to devices that only operate for a short time, such as a microwave oven, Large current devices can be used without any problems in actual use.

As described above, over-discharging of the battery can be prevented by limiting the power consumption according to the capacity (output capacity) of the power supply system. Furthermore, electrical equipment will not become unusable inadvertently.

Effects of the Invention As described above, the power supply system of the present invention provides the following effects.

(]) Since the battery and generator are connected in parallel and the total consumption of multiple electrical devices connected to them is limited, there is no risk of over-discharging the battery or malfunctioning of the device due to a drop in power supply voltage due to insufficient power supply capacity. It can be prevented.

(2) Since the configuration prioritizes and controls multiple devices, necessary devices are not restricted and the power supply system can operate stably.

(3) If the configuration is such that devices such as air conditioners that have little impact even if they are stopped for a short period of time are given a low priority, and devices that only operate for a short period of time such as a microwave oven are given lower priority, it is practical to Multiple high-capacity devices can be used without problems, and over-discharge of the battery can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a power supply system according to an embodiment of the present invention, FIG. 2 is a flowchart of electrical equipment control of the same power supply system, and the third leap is a circuit diagram of a conventional power supply system. 5... Generator, 6... Battery, 7
...Power supply, 9-12 ...Electrical equipment, 1
3...Control device. Name of agent: Patent attorney Shigetaka Awano (1 person)

Claims (1)

[Scope of Claims] (1) A power source including an internal combustion engine, a battery, and a generator that converts the power of the internal combustion engine into electrical energy; a plurality of electrical devices supplied with energy from the power source; A power supply system comprising: a control device that controls operations of electrical devices, the control device controlling operations of the electrical devices such that a total of currents flowing through the plurality of electrical devices is equal to or less than a predetermined value. (2) The power supply system according to claim 1, which prioritizes a plurality of electrical devices and suppresses the operation of the devices in order from the lowest priority so that the total current becomes less than or equal to a predetermined value. . (3) The power supply system according to claim 2, in which devices with high necessity are given a high priority. (4) The second claim includes a high-frequency heating device and an air conditioning device, and the high-frequency heating device has a higher priority than the air conditioning device.
Power system as described in section.