JP2000032676A - Power supply control device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply control device for simultaneously using an accessory socket for DC and an accessory socket for AC, without causing a battery to go dead. SOLUTION: Switching means 15a, 15b, and 15c are provided between a battery 11 for automobile and accessory sockets 12a and 12b for DC/an accessory socket 12c for AC. Both the accessory sockets 12a and 12b for DC and the accessory socket 12c for AC can be used until a switching control means 17 turns off the switching means 15a, 15b, and 15c, when electrical energy according to the total of current being detected by current total detection means 16a, 16b, and 16c exceeds a specific preset value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device for a motor vehicle, and more particularly to a power supply for a vehicle which controls power supply to a plurality of accessory sockets to which a load which needs to be supplied with power can be freely connected and detached. The present invention relates to a supply control device.

[0002]

2. Description of the Related Art In recent years, in automobiles, especially RVs (recreation vehicles), televisions, CD radio cassettes,
Opportunities to use various electronic devices such as video game machines in vehicles and the like are increasing.

For this reason, some automobiles are provided with a plurality of DC accessory sockets to which a load that needs to receive a DC power supply can be connected and detached in order to use these electronic devices at the same time. . In addition, in response to a user's desire to use household electronic devices other than those mounted on a vehicle in a vehicle or the like, an AC10 battery is used.
Some include an AC accessory socket that can supply AC power through a 0V inverter. In the case where both the DC accessory socket and the AC accessory socket are provided as described above, the amount of power consumed increases, and even when the engine is on and the alternator is generating power, the amount of power consumption decreases. As a result, there is a risk that the remaining battery level of the vehicle battery decreases and the engine cannot be started.

In order to solve the above-mentioned problem of battery exhaustion, a vehicle power supply device incorporating a vehicle power supply control device as shown in FIG. 3 has been proposed. As shown in FIG. 1, the DC power from the vehicle battery 1 is supplied to a fusible link 2 and an ignition switch 3 for turning on / off the power supply by operating a switch.
And the protective fuse 4 to the DC accessory socket 5. Further, an AC 100 V inverter 7 to which DC power from the vehicle battery 1 branched from the ignition switch 3 is supplied through a protective fuse 6 converts DC power into AC power, and converts the AC power into an AC accessory socket 8. Supply.

When the engine is turned on, the DC accessory socket 5 and the AC accessory socket 8 are provided with an alternator for generating AC by utilizing the driving of the engine instead of the power supply from the vehicle battery 1. The DC power obtained by converting the AC power from the power supply 9 is supplied through the fusible link 10. In such a state, when the amount of power generated by the alternator 9 exceeds the amount of power supplied through the DC accessory socket 5 and the AC accessory socket 8, the vehicle battery 1 is charged by the surplus, If the amount of power supplied through the DC accessory socket 5 and the AC accessory socket 8 is greater than the amount of power generated by the alternator 9, the remaining amount is supplied from the vehicle battery 1. There is a danger that the battery will run down due to a decrease in battery power.

[0006] The normally closed reed switch 11 is
It is connected between the 100 V inverter 7 and the AC accessory socket 8 and is provided in the DC accessory socket 5 so that the DC accessory socket 5 is opened when a load that needs to receive DC power is connected thereto. Has become. That is, when a load is connected to both the DC accessory socket 5 and the AC accessory socket 8, the reed switch 11 is opened, so that AC power cannot be supplied through the AC accessory socket 8, and the DC accessory socket 5 and the AC accessory socket 8 cannot be used at the same time, thereby preventing the battery from running down.

[0007]

As described above, in the related art, the DC and AC accessory sockets cannot be used at the same time to prevent the battery from running out. There is no restriction, and there is a danger that the battery will be dead if used for a long time, and it cannot be said that the battery is prevented from being dead. In addition, even when the battery does not run out, the DC and AC accessory sockets cannot be used at the same time, which is inconvenient.

In view of the above problems, the present invention provides a power supply control device for an automobile which enables simultaneous use of a DC accessory socket and an AC accessory socket without causing battery exhaustion. The task is to provide.

[0009]

According to the first aspect of the present invention, there is provided a DC load which is required to receive a DC power supply from a battery for an automobile, and is connected so as to be freely connected and disconnected. Vehicle that controls power supply to a DC accessory socket and an AC accessory socket to which an AC load that needs to be supplied with an AC power obtained by converting a DC power from a vehicle battery is detachably connected. A switching means provided between the vehicle battery and the DC accessory socket and the AC accessory socket, and a current sum detecting a sum of currents supplied through the accessory socket. A detecting means, and a power amount corresponding to the sum of the currents detected by the current sum detecting means is a predetermined value. When exceeding lies in automobile power supply control device, characterized in that it comprises a switching control means for turning off controlling the switching means.

According to the first aspect of the present invention, the switching means provided between the vehicle battery and the DC accessory socket and the AC accessory socket is an accessory socket detected by the current total detecting means by the switching control means. When the power amount according to the total amount of the current supplied through the power supply exceeds a predetermined value, the off-control is performed. DC and AC power can be supplied to both the accessory socket and the AC accessory socket.

According to a second aspect of the present invention, when the amount of power corresponding to the sum of the currents exceeds a predetermined value, the condition that the sum is equal to or more than the predetermined value when the engine is on is determined. When the current is continuously flowing for a predetermined time,
2. The power supply control device for an automobile according to claim 1, wherein the switching means that is turned off by the switching control means is a switching means provided between the vehicle battery and the AC accessory socket. Exists.

According to the second aspect of the present invention, when the engine is on, when a current having a total sum of currents equal to or greater than a predetermined value continuously flows for a predetermined time, it is determined according to the total current. When the power amount exceeds a predetermined value,
At this time, the switching control means controls off the switching means provided between the vehicle battery and the AC accessory socket, so that when the engine is on and the alternator is generating power, the sum of the currents is When the current is equal to or less than the predetermined value, the vehicle battery is regarded as being charged by the alternator and does not cause the battery to run down. If so, it is possible to supply DC and AC power to both the DC accessory socket and the AC accessory socket, assuming that the remaining amount of the battery for the vehicle is sufficient and the battery does not run out. Furthermore, when the engine is on and the alternator is constantly supplying the amount of power generation, the DC accessory socket does not receive a DC current even if a current whose total sum is equal to or greater than a predetermined value continuously flows for a predetermined time. Power can be supplied.

According to a third aspect of the present invention, when the amount of power corresponding to the sum of the currents exceeds a predetermined value, when the engine is off, the sum is multiplied by time. When the power amount exceeds the power amount of a predetermined value, and the switching unit turned off by the switching control unit is between the vehicle battery and the DC accessory socket and the AC accessory socket. 3. The vehicle power supply control device according to claim 1, wherein all the switching means are provided.

According to the third aspect of the present invention, when the engine is off, when the amount of power obtained by multiplying the total of the current by the time exceeds a predetermined value, the power corresponding to the total of the current is determined. When the amount exceeds a predetermined value, the switching control means at this time turns off all switching means provided between the vehicle battery and the DC accessory socket and the AC accessory socket, so that
When the alternator is not generating electricity when the engine is off and the amount of power obtained by multiplying the total current by the time is equal to or less than a predetermined value, it is assumed that the vehicle battery is sufficient and the battery does not run out. Thus, DC and AC power can be supplied to both the DC accessory socket and the AC accessory socket.

According to a fourth aspect of the present invention, when the power amount exceeds a power amount smaller than the predetermined value before the power amount exceeds the predetermined value, and when the power amount exceeds the predetermined value. The power supply control device for a vehicle according to any one of claims 1 to 3, further comprising an alarm generating means for generating an alarm so that the two can be distinguished from each other.

According to the fourth aspect of the present invention, an alarm is generated when the power amount exceeds a predetermined value before the power amount exceeds the predetermined value and when the power amount exceeds the predetermined value. Since the means issues a warning notifying the fact so that the two can be distinguished from each other, the switching control means informs the user in advance that the control is to be turned off so that the user can use the DC,
The use of the AC accessory socket can be restricted, and the interruption of power supply to the DC and AC accessory sockets can be prevented. Further, by notifying the user that the switching control unit has performed the off control, it can be understood that the power supply to the DC and AC accessory sockets has been cut off by the vehicle power supply control device.

According to a fifth aspect of the present invention, the switching means is a normally open relay, and when the switching control means outputs an ON control signal for ON control, the relay closes and the OFF control is performed. The vehicle according to any one of claims 1 to 4, wherein when the ON control signal is stopped, the relay is opened, and the switching control means turns on the switching means when the ignition switch is in an accessory position or an ON position. In the power supply control device.

According to the fifth aspect of the present invention, when the ignition switch is in the accessory position or the on position, the switching control means outputs an ON control signal for ON control, and the normally open relay as the switching means is closed. When the switching control means stops the on-control signal to perform the off-control, the relay is opened. Therefore, when the remaining amount of the battery for the vehicle is sufficient, the on-control signal can be output to close the relay, and the relay for the vehicle can be closed. When the remaining amount of the battery is low, the output of the ON control signal can be stopped to open the relay.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power supply control device for a vehicle according to the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a vehicle power supply device incorporating a vehicle power supply control device according to the present invention.
1 from the DC accessory socket 12
a and 12b. The DC power from the vehicle battery 11 is supplied by an AC100V inverter 13.
The AC power is then supplied to the AC accessory socket 12c. An automotive battery 11 and a DC accessory socket 12a,
The protective fuses 14a, 14b, 14c, the relays 15a, 15b, 15c, which are switching means for turning on and off the power supply from the vehicle battery 11, and the DC accessory sockets 12a, 12b and the AC 100V inverter 13, respectively. 12b and AC100V
Current detection resistors 16a, 16b as current sum detection means for detecting a current value supplied to the inverter 13;
16c.

At both ends of the current detection resistors 16a, 16b and 16c, the DC accessory sockets 12a and 12b and the AC 100V inverter 13
, The vehicle battery 11 is connected to the DC accessory sockets 12a and 12b and the AC 100V
Voltage V corresponding to the amount of power supplied to inverter 13
1, V2, and V3 are obtained, and the voltages V1, V2, and V3 are supplied to the microcomputer 17 (hereinafter, the microcomputer 17). Also, the relays 15a, 15b, 15c
It has a relay coil and a relay contact that is normally open and closes when a current flows through the relay coil. Transistors 18a, 18b, and 18c that are on / off controlled by the microcomputer 17 are connected to the relay coil. When the microcomputer 17 outputs H-level ON control signals S1, S2, and S3, the transistors 18a, 18b, and 18c are turned on, and current flows through the relay coil to close the relay contacts. Power is supplied from the vehicle battery 11 to the DC accessory sockets 12a and 12b and the AC accessory socket 12c.

The microcomputer 17 is connected to an accessory terminal X of the ignition switch 19, an ON terminal Y, and a terminal L of the alternator 20. The ignition switch 19 outputs an H-level accessory signal S4 and an ON signal S5 from the accessory terminal X and the ON terminal Y when the switch is turned to the accessory position and the ON position, respectively. The alternator 20 outputs an H-level power generation signal S6 from the terminal L when the engine is on and generating power. That is, the microcomputer 17 monitors the ignition switch 19 and the alternator 20 based on the accessory signal S4, the ON signal S5, and the power generation signal S6. A protective fuse 14d is provided between the ignition switch 19 and the vehicle battery 11, and a fusible link 14e is provided between the alternator 20 and the vehicle battery 11.

The operation of the power supply device for a vehicle incorporating the power supply control device for a vehicle having the above configuration will be described below. The microcomputer 17 includes a CPU that operates according to a predetermined control program, a ROM that stores the control program, and a RAM that stores various data. When the ignition switch 19 is turned to the accessory position or the on position by operating the switch and the accessory signal S4 or the on signal S5 is output, the microcomputer 17 turns on the on control signals S1, S2, S
3 is output to turn on the transistors 18a, 18b and 18c. When the transistors 18a, 18b, and 18c are turned on and a current flows through the relay coil, the relay contacts are closed. Therefore, the vehicle battery 11 is connected to the DC accessory sockets 12a, 12b and the AC accessory socket 12c through the closed relay contacts. Power is supplied.

Next, the power generation signal S from the alternator 20
When 6 is output, it is determined that the engine is on,
The microcomputer 17 obtains the sum of the currents flowing through the resistors from the voltages V1, V2, and V3 obtained at both ends of the current detection resistors 16a, 16b, and 16c, and the current whose sum is equal to or larger than a predetermined value continues for a predetermined time. When the current flows, the ON control signal S3 output to the transistor 18c is stopped and the relay contact of the relay 15c is opened to cut off the power supply to only the AC accessory socket 12c. For example, since the alternator 20 generally generates about 20 A of electric power per unit time, the safety is expected to prevent the battery from running out, and the total current of 15 A or more, which is a predetermined value, is a predetermined time. Continuous flow for more than a minute (these values depend on the alternator's power output and battery capacity)
The microcomputer 17 stops outputting the ON control signal S3.

When the power generation signal S6 is not output from the alternator 20, it is determined that the engine is off, and the microcomputer 17 determines that the current detection resistors 16a, 16b, 16
The sum of the currents is obtained from the voltages V1, V2, and V3 obtained at both ends of the transistor c. When the amount of power obtained by multiplying the sum of the currents by the conduction time exceeds a predetermined value, the transistors 18a, 18
b, 18c, the ON control signals S1, S
2. By stopping S3 and opening the relay contacts of the relays 15a, 15b, 15c, the DC accessory sockets 12a, 12b and the AC accessory socket 12c are opened.
Cut off the power supply to. For example, since the capacity of the automobile battery 11 is generally 3000 Amin, the power amount obtained by multiplying the sum of the current and the time in consideration of safety exceeds a predetermined value of 200 Amin (this value varies depending on the capacity of the battery). At this time, the microcomputer 17 stops outputting the ON control signals S1, S2, and S3.

When the microcomputer 17 is turned off by operating the ignition switch 19, the microcomputer 17 stops outputting the on-control signals S1, S2 and S3 and opens the relay contacts of the relays 15a, 15b and 15c. The power supply to the DC accessory sockets 12a and 12b and the AC accessory socket 12c is stopped.

Reference numeral 21 denotes an alarm buzzer as alarm generating means. The microcomputer 17 determines that the engine is off when the current is greater than or equal to a predetermined value and the current is continuously flowing for a time shorter than the predetermined time. Indicates that the power amount obtained by multiplying the sum of the current by the conduction time exceeds the power amount smaller than the predetermined value, that is, the DC accessory sockets 12a and 12b and the AC accessory socket 1
When the power consumption of 2c exceeds the power consumption of a value smaller than the predetermined value, the warning buzzer 21 is sounded intermittently. For example, when the engine is on, the engine is turned off when the total current exceeds 15 A, which is a predetermined value, and continuously flows for 2 minutes or more, which is shorter than the predetermined time. In this case, the power amount obtained by multiplying the sum of the current by the time is a power amount of 150 A that is a value smaller than a predetermined value.
When it exceeds min, the alarm buzzer sounds intermittently.

When the power consumption of the DC accessory sockets 12a and 12b and the AC accessory socket 12c exceeds a predetermined value, the microcomputer 17 causes the warning buzzer to beep continuously to make the DC accessory socket 12a.
a, 12b and the power supply supply to the AC accessory socket 12c are notified to the user.

As a result, the DC accessory sockets 12a and 12b and the AC accessory socket 12c
When the engine is turned on by notifying the user in advance of the interruption of power supply to the power supply, the use of unnecessary DC accessory sockets 12a and 12b and the AC accessory socket 12c can be restricted to prevent interruption of power supply. If the engine is not turned on, the power supply can be prevented from being cut off by turning on the engine. In addition, since the user is notified of the interruption of the power supply,
It can be seen that the power supply control device for the vehicle has cut off the power supply.

The operation of the microcomputer 17 will be described in detail with reference to a flowchart shown in FIG. That is, the microcomputer 17 starts the operation when the accessory signal S4 or the ON signal S5 is input from the ignition switch 19, and proceeds to step SP
1, microcomputer 17 includes transistors 18a and 18a.
On / off control signals S1, S2 and S3 are output for b and 18c. At this time, the transistors 18a, 18b, 18c
Is turned on and a current flows through the relay coils of the relays 15a, 15b, and 15c to close the relay contacts. Therefore, the vehicle battery 11 is connected to the DC accessory sockets 12a, 12b and the AC accessory socket 12c through the closed relay contacts. Power is supplied to this.

Next, proceeding to step SP2, the voltages V1, V2 obtained at both ends of the current detection resistors 16a, 16b, 16c are obtained.
By taking in V2 and V3, the current flowing through each resistor itself is obtained and A / D converted. The digital value thus obtained is added to obtain the sum of the current flowing through the resistor itself, and it is determined whether or not this is 0 or more. When the determination becomes YES, the process proceeds to step SP3.

In step SP3, the power generation signal S6
It is determined whether or not the alternator 20 is generating power. If the determination in step SP3 is YES, the process proceeds to step SP4, where the sum of the currents is obtained, and it is determined whether or not the sum of the currents exceeds 15A. If the determination in step SP4 is YES, the process proceeds to step SP5, and if the determination is NO, the process returns to step SP3. In step SP5, the timer is turned on to measure the duration of the state where the total current exceeds 15A, and the process proceeds to step SP6.

In step SP6, a signal output from the ignition switch 19 is fetched to change the ignition switch 19, for example, the accessory signal S.
It is determined whether there has been a change from 5 to the ON signal S6 and from the ON signal S6 to the accessory signal S5. At the same time, it is determined whether or not the state where the sum of the currents obtained by taking in the voltages V1, V2, and V3 is 0 has continued for 1 second or more. If the determination in step SP6 is YES, the process proceeds to step SP7, resets the timer, and returns to step SP2. Also,
If the determination in step SP6 is NO, step SP8
And the sum of the current is 15 according to the time indicated by the timer.
It is determined whether the state exceeding A has continued for 2 minutes or more. If the determination in step SP8 is YES, step SP9
And returns to step SP6 if NO.

At step SP9, the warning buzzer 21
Is sounded intermittently and the user is notified in advance that power supply to the DC accessory sockets 12a and 12b and the DC accessory socket 12c will be cut off if the user continues to use the battery in the current state. Next, the process proceeds to step SP10, where it is determined whether the signal output from the ignition switch 19 has changed again, and at the same time, the voltages V1, V2,.
The state where the sum of the currents obtained by taking in V3 is 0 is 1 sec.
It is determined whether or not c has been continued. If the determination in step SP10 is YES, the process returns to step SP7, and if the determination is NO, the process proceeds to step SP11. In step SP11, it is determined whether or not the state in which the total current exceeds 15A has continued for 5 minutes or more according to the time indicated by the timer, and YES
In the case of (1), the process proceeds to step SP12, the alarm buzzer is continuously sounded, the ON control signal S3 output to the transistor 18c is stopped, and the power supply to the AC accessory socket 12c is cut off.

In step SP3, if the alternator 20 is not generating power and the determination is NO, the process proceeds to step SP13, where the current detection resistors 16a, 16b, 1
The timer is turned on to measure the energizing time of the current flowing through 6c, and the process proceeds to the next step SP14. Step SP1
4, whether there is a change in the signal output from the ignition switch 19 and at the same time, the voltages V1 and V
2. The state where the sum of currents obtained by taking in V3 is 0 is 1
It is determined whether or not it has continued for more than sec. Step SP14
If the determination is YES, the process proceeds to step SP7, resets the timer, and returns to step SP2.

If the determination in step SP14 is NO, the process proceeds to step SP15. Step SP
At 15, the voltages V 1, V 2, and V 3 are taken in to obtain the sum of the currents, and it is determined whether or not the integrated value of the sum of the currents and the time of the timer has exceeded 150 Amin. The process proceeds to SP16, and if NO, returns to step SP14. In step SP16, the warning buzzer 21 sounds intermittently, and
Proceed to P17. In step SP17, it is determined whether or not the signal output from the ignition switch 19 has changed again, and at the same time, whether or not the state in which the sum of the currents obtained by taking in the voltages V1, V2 and V3 is 0 has continued for 1 second or more. I do. If the determination in step SP17 is YES, the process proceeds to step SP7, the timer is reset, and the process returns to step SP2. If the determination is NO, the process proceeds to step SP18.

In step SP18, the voltages V1,
The sum of the currents is obtained from V2 and V3, and it is determined whether or not the integrated value of the sum of the currents and the time of the timer has exceeded 200 Amin.
Go to 9. In step SP19, the warning buzzer sounds continuously, and the transistors 18a, 18b, 18c
ON control signals S1, S2, S3 output to
Is stopped, the power supply to the DC accessory sockets 12a and 12b and the AC accessory socket 12c is cut off, and the process proceeds to step SP20. Step SP20
In, it is again determined whether or not the alternator 20 has generated power. If the determination is YES, the process returns to step SP1 and N
In the case of O, the process returns to step SP19.

When the ignition switch 19 is turned to the off position, the microcomputer 17 resets the timer to stop the arithmetic processing, and starts the processing when it comes to the accessory position and the on position again.

In the above-described embodiment, when the total current exceeds 15 A for 5 minutes when the engine is on, the total current is multiplied by the energizing time when the engine is off for 5 minutes. When the value exceeds 200 Amin, the microcomputer 17 stops the ON control signals S1, S2, and S3, and sets the vehicle battery 1 for the DC accessory sockets 12a and 12b and the AC accessory socket 12c.
1, the microcomputer 17 turns on the control signals S1 and S2 when the value obtained by multiplying the total current and the energizing time exceeds a predetermined value regardless of whether the engine is on or off. , S3 are stopped and the DC accessory sockets 12a and 12b and the AC accessory socket 1
The power supply from the vehicle battery 11 to 2c may be cut off. In this case, the predetermined value may be any value as long as the value obtained by multiplying the sum of the current and the energizing time does not exceed the predetermined value without fear of running out of the battery.

In the above-described embodiment, when the ignition switch is in the accessory position or the on position, the microcomputer 17 sets the on control signals S1, S2, S
3, the normally open relays 15a, 15b and 15c are closed, and when the microcomputer 17 stops the ON control signals S1, S2 and S3, the relays 15a, 15b and 15c are opened.
ON control signal S when the remaining amount of the battery for the vehicle is low
The power supply to the DC accessory sockets 12a, 12b and the AC accessory socket 12c is stopped by opening the relays 15a, 15b, 15c without consuming power by stopping the output of 1, S2, S3, and By using normally closed relays 15a, 15b, 15c, an ignition switch is provided between the relays 15a, 15b, 15c and the vehicle battery 11, and the microcomputer 17
Outputs ON control signals S1, S2, S3, and relay 1
5a, 15b and 15c may be opened.

[0040]

As described above, according to the first aspect of the present invention, the DC accessory socket and the AC accessory socket are provided while the electric energy corresponding to the sum of the currents is equal to or less than a predetermined value. Since both DC and AC power can be supplied, when the amount of electric power according to the sum of the currents is equal to or less than a predetermined value, a power supply control for a vehicle that can use both the DC accessory socket and the AC accessory socket. A device is obtained.

According to the second aspect of the invention, when the engine is on and the alternator is generating power, the vehicle battery is charged by the alternator when the sum of the currents is equal to or less than a predetermined value. It is also assumed that the battery does not run out when the total amount of current is equal to or greater than a predetermined value and the state is equal to or less than a predetermined time if the vehicle battery has sufficient remaining power. Thus, DC and AC power can be supplied to both the DC accessory socket and the AC accessory socket. Furthermore, when the engine is on and the alternator is constantly supplying the amount of power generation, the DC accessory socket does not receive a DC current even if a current whose total sum is equal to or greater than a predetermined value continuously flows for a predetermined time. Since power can be supplied, when the engine is on, when the sum of the currents is equal to or less than a predetermined value, or even when the sum of the currents is equal to or more than the predetermined value, the state is equal to the predetermined value. If it is less than the time, both the DC accessory socket and the AC accessory socket can be used, and furthermore, the DC accessory socket can be used even if the current whose total current is equal to or more than a predetermined value continuously flows for a predetermined time. An automobile power supply control device is obtained.

According to the third aspect of the present invention, when the engine is off and the alternator is not generating power, if the electric energy obtained by multiplying the total current by the time is equal to or less than a predetermined value,
Assuming that the battery for the car is sufficient and there is no danger of running out of the battery, both the DC accessory socket and the AC accessory socket can be used. A control device is obtained.

According to the fourth aspect of the invention, the user can be notified in advance of the fact that the switching control means will perform the off-control, or can be notified of the fact that the off-control has been performed, so that the user can restrict the use of the accessory socket in advance. Thus, it is possible to prevent the power supply to the accessory socket from being cut off in advance, and to obtain the power supply device for the vehicle that indicates that the power supply to the accessory socket has been cut off by the power supply control device for the vehicle.

According to the fifth aspect of the invention, the relay can be closed by outputting the ON control signal when the remaining amount of the battery for the vehicle is sufficient, and the ON control signal is output when the remaining amount of the battery for the vehicle is small. Can be stopped and the relay can be opened, so that when the remaining amount of the battery for the vehicle is low, the relay can be opened without consuming power and the power supply to the DC and AC accessory sockets can be stopped.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a vehicle power supply device incorporating a vehicle power supply control device according to the present invention.

FIG. 2 is a flowchart showing a processing procedure by a microcomputer constituting a vehicle power supply device incorporating the vehicle power supply control device of FIG. 1;

FIG. 3 is a diagram showing an example of a vehicle power supply device incorporating a conventional vehicle power supply control device.

[Explanation of symbols]

12a, 12b DC accessory socket 12c AC accessory socket 19 Ignition switch 15a, 15b, 15c Switching means (relay) 16a, 16b, 16c Current sum detection means (current detection resistor) 17 Switching control means (microcomputer) 21 Warning generation Means (warning buzzer)

Claims (5)

[Claims] 1. A DC accessory socket to which a DC load, which needs to be supplied with a DC power from a vehicle battery, is detachably connected, and an AC power source obtained by converting the DC power from the vehicle battery. An automotive power supply control device for controlling power supply to an AC accessory socket to which an AC load that needs to be supplied is connected and detached, wherein the automotive battery, the DC accessory socket, and the AC accessory Switching means respectively provided between the socket and the socket; current sum detection means for detecting a sum of currents supplied through the accessory socket; and a power amount corresponding to the sum of the currents detected by the current sum detection means. A switching control unit for controlling the switching unit to turn off when a predetermined value is exceeded; A power supply control device for a vehicle, comprising: 2. When the power amount according to the sum of the currents exceeds a predetermined value, the condition that the current whose sum is equal to or more than the predetermined value is equal to or longer than a predetermined value when the engine is on. The switching means, which is turned off continuously by the switching control means, is a switching means provided between the vehicle battery and the AC accessory socket. 2. The power supply control device for an automobile according to claim 1. 3. When the amount of power corresponding to the sum of the currents exceeds a predetermined value, when the engine is off, the amount of power obtained by multiplying the sum by time is predetermined. The switching means, which is turned off by the switching control means, includes all switching provided between the vehicle battery and the DC accessory socket and the AC accessory socket. 3. The power supply control device for an automobile according to claim 1, wherein the power supply control device is a means. 4. Before the power amount exceeds the predetermined value,
The apparatus according to claim 1, further comprising: an alarm generating unit that issues an alarm so that the two can be identified when the power amount exceeds a predetermined amount of power and when the power amount exceeds the predetermined value. Item 4. An automotive power supply control device according to any one of Items 1 to 3. 5. The switching means is a normally open relay. When the switching control means outputs an ON control signal to perform ON control, the relay closes, and when the ON control signal is stopped to perform OFF control, 5. The power supply control device according to claim 1, wherein the relay is opened, and the switching control means controls the switching means to be on when the ignition switch is in an accessory position or an on position.