JP3920992B2 - Automotive power supply controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automotive power supply control device, and more particularly to an automotive power supply control device that controls power supply to a plurality of accessory sockets to which loads that need to be supplied with power can be connected and disconnected.
[0002]
[Prior art]
In recent years, in automobiles, particularly RV vehicles (recreational vehicles), etc., there are increasing opportunities to use various electronic devices such as televisions, CD radio cassettes, and video game machines in the vehicle.
[0003]
For this reason, some automobiles are provided with a plurality of DC accessory sockets to which a load that needs to be supplied with a DC power supply is detachably connected in order to use the plurality of electronic devices at the same time. In addition, there is also an AC accessory socket that can supply AC power from an automobile battery via an AC100V inverter in response to a user's request to use household electronic devices other than those mounted on the vehicle in a vehicle or the like. Even when both the DC accessory socket and the AC accessory socket as described above are provided, the amount of power consumed is large, and even if the engine is on and the alternator is generating power, There was a risk that the battery would run out and the engine could not be started due to a decrease in the remaining amount of the car battery.
[0004]
Therefore, in order to eliminate the above-mentioned battery exhaustion, an automobile power supply apparatus incorporating an automobile power supply control apparatus as shown in FIG. 3 is considered. As shown in the figure, a DC power source from an automobile battery 1 is connected to a DC accessory socket 5 via a fusible link 2, an ignition switch 3 for turning on / off the power supply by a switch operation, and a protective fuse 4. It is supplied to. The AC100V inverter 7 to which the DC power from the automotive battery 1 branched from the ignition switch 3 is supplied via the protective fuse 6 converts the DC power into AC power, which is supplied to the AC accessory socket 8. Supply.
[0005]
Note that the DC accessory socket 5 and the AC accessory socket 8 are supplied from the alternator 9 that generates AC power using the drive of the engine instead of the power supply from the automobile battery 1 when the engine is on. A DC power obtained by converting the AC power is supplied via 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 car battery 1 is charged by the surplus, If the amount of power supplied through the DC accessory socket 5 and 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, so the remaining amount of the vehicle battery 1 remains. There is a risk that the battery will run down and the battery will run out.
[0006]
Further, the normally closed reed switch 11 is connected between the AC 100V inverter 7 and the AC accessory socket 8 and is provided in the DC accessory socket 5. The DC accessory socket 5 needs to receive DC power supply. It opens when a certain load is connected. 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 no AC power can be supplied through the AC accessory socket 8. 5 and the AC accessory socket 8 cannot be used at the same time, thereby preventing the battery from running out.
[0007]
[Problems to be solved by the invention]
As described above, the battery is prevented from running out by preventing the use of DC and AC accessory sockets at the same time, but there are no restrictions when using them independently, and they can be used for a long time. If this happens, there is a risk of battery exhaustion, and it cannot be said that it is preventing battery exhaustion. Not only that, even when there is no concern about battery exhaustion, the DC and AC accessory sockets cannot be used at the same time, making them unusable.
[0008]
Accordingly, the present invention provides an automotive power supply control device that allows simultaneous use of a DC accessory socket and an AC accessory socket without causing battery exhaustion, focusing on the above problems. Is an issue.
[0009]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a DC accessory socket to which a DC load that needs to be supplied with a DC power supply from an automotive battery is detachably connected, and an automotive 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 with AC power obtained by exchanging DC power is connected to and separated from the AC power supply socket. Switching means provided between the battery and the accessory for direct current and the accessory socket for alternating current, current sum detection means for detecting the sum of currents supplied through the accessory socket,A switching control means for controlling the switching means to be turned off when a current whose sum of currents detected by the current sum detection means is equal to or greater than a predetermined value continuously flows for a predetermined time when the engine is on;The present invention resides in an automobile power supply control device.
[0010]
  According to invention of Claim 1,When the switching control means, when the engine is on, the switching means is turned off when the current that the sum of the currents detected by the current sum detection means is equal to or greater than a predetermined value continuously flows for a predetermined time.When the engine is on and the alternator is generating power, when the sum of the currents is less than or equal to a predetermined value, the car battery is considered to be charged by the alternator and will not cause the battery to go up. Both the accessory socket for DC and the accessory socket for AC are considered that the remaining amount of the car battery is sufficient and the battery does not run up even if the total current is equal to or greater than the predetermined value and the state is less than the predetermined time. Can be supplied with DC or AC power.
[0011]
  The invention according to claim 2When the engine is on, the switching control means turns off only the switching means provided between the automobile battery and the AC accessory socket among the switching means.The present invention resides in an automobile power supply control device according to claim 1.
[0012]
  According to invention of Claim 2,Since the switching control means turns off only the switching means provided between the automobile battery and the AC accessory socket among the switching means when the engine is on.If the engine is on and the alternator is always supplying power, the DC accessory socket should be connected to a DC power supply even if a current whose total current is equal to or greater than a predetermined value continues to flow for a predetermined time. Can be supplied.
[0013]
  The invention described in claim 3When the electric power obtained by multiplying time by the sum of currents detected by the current sum detection means exceeds a predetermined amount of power when the engine is off, the switching control means All switching means provided between the DC accessory socket and the AC accessory socket are turned off.The present invention resides in an automobile power supply control device according to claim 1 or 2.
[0014]
According to the third aspect of the present invention, when the engine is off, when the amount of power obtained by multiplying the sum of current by time exceeds a predetermined value, the amount of power corresponding to the sum of current is The switching control means controls off all the switching means provided between the vehicle battery, the DC accessory socket, and the AC accessory socket, so that the engine is turned off. If the alternator is not generating power and the amount of power obtained by multiplying the total current by time is less than or equal to the specified value, it is considered that there is enough remaining battery for the automobile and the battery will not run out. DC and AC power can be supplied to both the accessory socket and the AC accessory socket.
[0015]
  The invention according to claim 4When the engine is off, when the power obtained by multiplying the current sum detected by the current sum detection means with time exceeds the amount of power smaller than the predetermined value, When the set value is exceeded,It further comprises an alarm generating means for emitting an alarm so that the both can be identified.Claim 3The power supply control device for automobiles.
  According to a fifth aspect of the present invention, when the engine is turned on, a current in which the sum of the currents detected by the current sum detection means exceeds a predetermined value continuously flows for a time shorter than the predetermined time; 2. An alarm generating means for generating an alarm so that the alarm can be discriminated when the current whose total sum exceeds the predetermined value continuously flows for the predetermined time. It exists in the power supply control apparatus for motor vehicles of -4.
[0016]
  Claim4 and 5According to the described invention, SuBy notifying the user in advance that the switching control means is turned off, the user can restrict the use of the accessory socket for DC and AC, and the power supply to the accessory socket for DC and AC can be prevented from being interrupted. Further, it is understood that the power supply to the DC and AC accessory sockets is cut off by the automobile power supply control device by notifying the user that the switching control means has been turned off.
[0017]
  Claim6In the described invention, the switching means is a normally-closed relay, and when the switching control means outputs an on-control signal, the relay is closed and the on-control signal is stopped for off-control. The relay is then 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.1-5It exists in any one of the power supply control apparatuses for motor vehicles of description.
[0018]
  Claim6According to the described invention, when the ignition switch is in the accessory position or the on position, when the switching control means outputs the on control signal to turn on, the normally open relay as the switching means is closed, and the switching control means When the on-control signal is stopped for off-control, the relay opens, so when the car battery has sufficient charge, the on-control signal can be output to close the relay, and the car battery has little charge Sometimes it is possible to stop the output of the ON control signal and open the relay.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a power supply control device for an automobile according to the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of an automobile power supply apparatus incorporating an automobile power supply control apparatus according to the present invention. DC power from an automobile battery 11 is supplied to DC accessory sockets 12a and 12b. The Further, the DC power from the automobile battery 11 is converted into AC power by the AC 100V inverter 13, and then this AC power is supplied to the AC accessory socket 12c. Between the automotive battery 11 and the DC accessory sockets 12a, 12b and the AC100V inverter 13, respectively, protective fuses 14a, 14b, 14c, and a relay 15a, which is a switching means for turning on / off the power supply from the automotive battery 11, 15b, 15c, and current detection resistors 16a, 16b, 16c as current sum detection means for detecting current values supplied to the DC accessory sockets 12a, 12b and the AC100V inverter 13 are provided.
[0020]
At both ends of the current detection resistors 16a, 16b and 16c, the current supplied to the downstream DC accessory sockets 12a and 12b and the AC100V inverter 13 through the resistors themselves, that is, the automobile battery 11 is connected to the DC accessory sockets 12a, 12b and Voltages V1, V2, and V3 corresponding to the amount of power supplied to the AC100V inverter 13 are obtained, and the voltages V1, V2, and V3 are supplied to the microcomputer 17 (hereinafter referred to as the microcomputer 17). The relays 15a, 15b, and 15c have a relay coil and a relay contact that closes when a current flows through the relay coil in a normally open state. The relay coil includes a transistor 18a that is on / off controlled by the microcomputer 17. , 18b, 18c are connected. When the microcomputer 17 outputs H-level ON control signals S1, S2, and S3, the transistors 18a, 18b, and 18c are turned on, current flows through the relay coil, and the relay contact is closed. Power is supplied from the automobile battery 11 to the DC accessory sockets 12a and 12b and the AC accessory socket 12c.
[0021]
Connected to the microcomputer 17 are an accessory terminal X and an ON terminal Y of the ignition switch 19 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 accessory position is turned on by the switch operation. 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 with the accessory signal S4, the ON signal S5, and the power generation signal S6. A protective fuse 14 d is provided between the ignition switch 19 and the automobile battery 11, and a fusible link 14 e is provided between the alternator 20 and the automobile battery 11.
[0022]
The operation of the automobile power supply apparatus incorporating the automobile power supply control apparatus having the above-described 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 switched to the accessory position or the on position by the switch operation and the accessory signal S4 or the on signal S5 is output, the microcomputer 17 outputs the on control signals S1, S2, and S3 to output the transistors 18a, 18b, Turn on 18c. When the transistors 18a, 18b, and 18c are turned on and a current flows through the relay coil, the relay contact is closed. From the vehicle battery 11 to the DC accessory sockets 12a and 12b and the AC accessory socket 12c through the closed relay contact. Power is supplied.
[0023]
Next, when the power generation signal S6 from the alternator 20 is output, the microcomputer 17 determines that the engine is on, and the microcomputer 17 determines resistance from the voltages V1, V2, and V3 obtained at both ends of the current detection resistors 16a, 16b, and 16c. The sum of the currents flowing through itself is obtained, and when a current whose sum is equal to or greater than a predetermined value continuously flows for a predetermined time, the on-control signal S3 output to the transistor 18c is stopped and relayed The power supply only to the AC accessory socket 12c is cut off by opening the relay contact 15c. For example, since the alternator 20 generally generates about 20 A of electric power per unit time, a current of 15 A or more, which is a predetermined value of the total sum of currents, is assumed to be safe so that the battery does not run out. The microcomputer 17 stops the output of the ON control signal S3 when continuously flowing for more than a minute (these values vary depending on the amount of power generated by the alternator and the capacity of the battery).
[0024]
When the power generation signal S6 from the alternator 20 is not output, it is determined that the engine is off, and the microcomputer 17 determines the current from the voltages V1, V2, and V3 obtained at both ends of the current detection resistors 16a, 16b, and 16c. The on-control signals S1, S2, and S3 output to the transistors 18a, 18b, and 18c when the amount of power obtained by multiplying the sum of the currents by the energization time exceeds a predetermined value are stopped. By opening the relay contacts of the relays 15a, 15b, 15c, the power supply to the DC accessory sockets 12a, 12b and the AC accessory socket 12c is cut off. For example, since the capacity of the automobile battery 11 is generally 3000 Amin, the amount of electric power obtained by multiplying the sum of current and time in anticipation 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.
[0025]
Further, when the microcomputer 17 is in the off position by the switch operation of the ignition switch 19, the output of the on control signals S1, S2, and S3 is stopped and the relay contacts of the relays 15a, 15b, and 15c are opened, thereby the DC accessory. The power supply to the sockets 12a and 12b and the AC accessory socket 12c is stopped.
[0026]
Reference numeral 21 denotes an alarm buzzer as an alarm generating means. When the engine is on, the microcomputer 17 is turned off when a current whose sum of currents is equal to or greater than a predetermined value continuously flows for a time shorter than the predetermined time described above. Is when the amount of power obtained by multiplying the sum of current and energization time exceeds the amount of power smaller than the predetermined value, that is, the amount of power consumed by the DC accessory sockets 12a and 12b and the AC accessory socket 12c. When the amount of power exceeds a predetermined amount of power, the warning buzzer 21 is intermittently sounded. For example, when the engine is on, the engine is turned off when a current of 15 A or more, which is a predetermined value of the total current, continuously flows for 2 minutes or more, which is a time shorter than a predetermined time. If the amount of power obtained by multiplying the sum of current and time exceeds 150 Amin, which is a value of power smaller than a predetermined value, the alarm buzzer sounds intermittently.
[0027]
Further, the microcomputer 17 continuously sounds a warning buzzer when the power consumption of the DC accessory sockets 12a and 12b and the AC accessory socket 12c exceeds a predetermined value, and the DC accessory sockets 12a and 12b and the AC accessory socket 12a and 12b are used. The user is notified of the interruption of the power supply to the accessory socket 12c.
[0028]
As a result, when the power supply to the DC accessory sockets 12a and 12b and the AC accessory socket 12c is informed in advance to the user and the engine is turned on, the DC accessory sockets 12a and 12b and the AC accessory socket that are not required are used. The use of the accessory socket 12c can be restricted to prevent the power supply from being cut off. When the engine is not turned on, the power supply can be cut off by turning on the engine. In addition, since the user is informed of the interruption of the power supply, it can be seen that the power supply control device for automobile has cut off the power supply.
[0029]
The details of the operation described above will be described below with reference to the flowchart shown in FIG. That is, the microcomputer 17 starts operating when the accessory signal S4 or the on signal S5 is input from the ignition switch 19, and in step SP1, the microcomputer 17 controls the transistors 18a, 18b, and 18c with the on control signals S1 and S2. , S3 is output. At this time, the transistors 18a, 18b, and 18c are turned on and current is supplied to the relay coils of the relays 15a, 15b, and 15c to close the relay contacts, so that the DC battery accessory socket 12a, Power is supplied to 12b and the AC accessory socket 12c.
[0030]
Next, proceeding to step SP2, the voltages V1, V2, and V3 obtained at both ends of the current detection resistors 16a, 16b, and 16c are taken in, the currents flowing through the resistors themselves are obtained, and A / D conversion is performed. The digital values thus obtained are added to obtain the sum of the currents flowing through the resistors themselves, and it is determined whether or not they are 0 or more.
[0031]
In step SP3, it is determined whether or not the alternator 20 is generating power based on the power generation signal S6. If the determination in step SP3 is YES, the process proceeds to step SP4, where the sum of 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 NO, the process returns to step SP3. In step SP5, the timer is turned on in order to measure the duration of the state in which the total current exceeds 15 A, and the process proceeds to step SP6.
[0032]
In step SP6, a signal output from the ignition switch 19 is taken in, and it is determined whether or not there is a change in the ignition switch 19, for example, a change from the accessory signal S5 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 continues for 1 second or longer. If the determination in step SP6 is yes, the process proceeds to step SP7, the timer is reset, and the process returns to step SP2. If the determination in step SP6 is NO, the process proceeds to step SP8, and it is determined whether or not the state in which the total current exceeds 15 A has continued for 2 minutes or more depending on the time indicated by the timer. If the determination in step SP8 is YES, the process proceeds to step SP9, and if NO, the process returns to step SP6.
[0033]
In step SP9, the alarm buzzer 21 is intermittently sounded to inform the user in advance that the power supply to the DC accessory sockets 12a and 12b and the DC accessory socket 12c will be cut off if the use is continued in the current state. Next, proceeding to step SP10, whether or not there has been a change in the signal output from the ignition switch 19 again, and at the same time, whether or not the state where the sum of the currents obtained by taking in the voltages V1, V2, and V3 is 0 continues for 1 second or more. Judge whether or not. If the determination in step SP10 is YES, the process returns to step SP7, and if NO, the process proceeds to step SP11. In step SP11, it is determined whether or not the state in which the total current exceeds 15 A has continued for 5 minutes or more according to the time indicated by the timer. If YES, the process proceeds to step SP12 and the warning buzzer is continuously sounded. Then, the on control signal S3 output to the transistor 18c is stopped to cut off the power supply to the AC accessory socket 12c.
[0034]
In step SP3, if the alternator 20 is not generating power and the determination is NO, the process proceeds to step SP13, where the timer is turned on to measure the energization time of the current flowing through the current detection resistors 16a, 16b, and 16c. Proceed to next step SP14. In step SP14, it is determined whether or not the signal output from the ignition switch 19 has changed, and at the same time, whether or not the state where the sum of currents obtained by taking in the voltages V1, V2, and V3 is 0 continues for 1 sec or longer. . If the determination is YES in step SP14, the process proceeds to step SP7, the timer is reset, and the process returns to step SP2.
[0035]
If the determination at step SP14 is no, the process proceeds to step SP15. In step SP15, voltages V1, V2, and V3 are taken to obtain the sum of currents, and it is determined whether or not the integrated value of the sum of the currents and the time of the timer exceeds 150 Amin. The process proceeds to step SP16, and if NO, the process returns to step SP14. In step SP16, the warning buzzer 21 is intermittently sounded and the process proceeds to step SP17. In step SP17, it is determined again whether or not the signal output from the ignition switch 19 has changed, 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 continues for 1 second or longer. To 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, and if the determination is NO, the process proceeds to step SP18.
[0036]
In step SP18, the sum of currents is obtained from the voltages V1, 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. Proceed to SP19. In step SP19, a warning buzzer is continuously sounded to stop the on control signals S1, S2, and S3 output to the transistors 18a, 18b, and 18c, and the DC accessory sockets 12a and 12b and the AC accessory are supplied. The power supply to the socket 12c is cut off, and the process proceeds to step SP20. In step SP20, it is determined again whether the alternator 20 has generated power. If the determination is YES, the process returns to step SP1, and if NO, the process returns to step SP19.
[0037]
Further, when the ignition switch 19 is set to the off position, the microcomputer 17 resets the timer to stop the arithmetic processing, and starts the processing when the accessory position and the on position are set again.
[0038]
In the above-described embodiment, when the engine is on, when the total current exceeds 15 A continues for 5 minutes, when the engine is off, the value obtained by multiplying the total current and the energization time is When it exceeds 200 Amin, the microcomputer 17 stops the on control signals S1, S2, and S3 and shuts off the power supply from the vehicle battery 11 to the DC accessory sockets 12a and 12b and the AC accessory socket 12c. The microcomputer 17 stops the on control signals S1, S2, S3 when the value obtained by multiplying the sum of the current and the energization time exceeds a predetermined value regardless of whether the current is on or off, and the DC accessory sockets 12a, 12b The power supply from the automobile battery 11 to the AC accessory socket 12c may be cut off. In this case, the predetermined value may be a value that does not cause the battery to run out when the value obtained by multiplying the current sum and the energization time does not exceed the predetermined value.
[0039]
In the above-described embodiment, when the ignition switch is in the accessory position or the on position, when the microcomputer 17 outputs the on control signals S1, S2, and S3, the normally open relays 15a, 15b, and 15c are closed and the microcomputer 17 is turned on. When the control signals S1, S2, and S3 are stopped, the relays 15a, 15b, and 15c are opened. Therefore, when the remaining amount of the vehicle battery is low, the output of the on control signals S1, S2, and S3 is stopped and power is not consumed. The relays 15a, 15b and 15c are opened to stop the power supply to the DC accessory sockets 12a and 12b and the AC accessory socket 12c. For example, the normally closed relays 15a, 15b and 15c are used. Ignition switch between the relays 15a, 15b, 15c and the vehicle battery 11 Provided, the microcomputer 17 outputs an on control signal S1, S2, S3 relay 15a, 15b, may be 15c is opened.
[0040]
【The invention's effect】
  As described above, according to the first aspect of the present invention,, DWhen the engine is on and the alternator is generating power, when the sum of the currents is equal to or less than a predetermined value, it is considered that the car battery is charged by the alternator and does not cause the battery to rise. Both the accessory socket for DC and the accessory socket for AC are considered that the remaining amount of the car battery is sufficient and the battery does not run up even if the total current is equal to or greater than the predetermined value and the state is less than the predetermined time. DC or AC power can be supplied to the engine so that when the engine is on, the total current is equal to or less than a predetermined value, or the total current is equal to or greater than a predetermined value. If the state is less than the predetermined time, the power supply controller for automobiles that can use both the DC accessory socket and the AC accessory socket can be used. It is obtained.
[0041]
  According to invention of Claim 2,, DIf the engine is on and the alternator is constantly supplying power, the DC accessory socket should be connected to the DC power supply socket even if a current whose total current is equal to or greater than a predetermined value continues to flow for a predetermined time. Therefore, even if a current whose total current is equal to or greater than a predetermined value continuously flows for a predetermined time, an automotive power supply control device that can use the DC accessory socket can be obtained.
[0042]
According to the invention of claim 3, when the engine is off and the alternator is not generating electricity, if the amount of electric power obtained by multiplying the total current by time is less than or equal to a predetermined value, the remaining amount of the vehicle battery Therefore, it is possible to use both the DC accessory socket and the AC accessory socket, so that it is possible to obtain an automotive power supply control apparatus that can use the remaining amount of the automotive battery to the maximum.
[0043]
  Claim4 and 5According to the described invention, since it is possible to notify the user that the switching control means performs the off control in advance or that the switching control means has performed the off control, the user restricts the use of the accessory socket in advance, and the power supply to the accessory socket It is possible to prevent the supply from being cut off in advance, and to obtain an automobile power supply device that can be understood that the power supply to the accessory socket is cut off by the automobile power supply control device.
[0044]
  Claim6According to the invention, when the remaining amount of the vehicle battery is sufficient, the relay can be closed by outputting an on control signal, and when the remaining amount of the vehicle battery is small, the output of the on control signal is stopped. Since the relay can be opened, the power supply to the DC and AC accessory sockets can be stopped by opening the relay without consuming electric power when the remaining amount of the vehicle battery is low.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of an automotive power supply apparatus incorporating an automotive power supply control apparatus according to the present invention.
FIG. 2 is a flowchart showing a processing procedure by a microcomputer constituting the automobile power supply apparatus incorporating the automobile power supply control apparatus of FIG. 1;
FIG. 3 is a diagram showing an example of an automotive power supply device incorporating a conventional automotive 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 (6)

It is necessary to receive the supply of AC power obtained by exchanging the DC power supply from the car battery and the DC accessory socket to which the DC load that needs to receive the DC power supply from the car battery can be connected and disconnected. In an automotive power supply control device for controlling power supply to an AC accessory socket to which an AC load is detachably connected,
Switching means provided between the automobile battery and the DC accessory socket and the AC accessory socket;
Current sum detection means for detecting the sum of currents supplied through the accessory socket;
Switching control means for controlling the switching means to be turned off when a current whose total current detected by the current sum detection means is equal to or greater than a predetermined value continuously flows for a predetermined time when the engine is on. A power supply control device for automobiles. The switching control means turns off only the switching means provided between the vehicle battery and the AC accessory socket among the switching means when the engine is on.
The automobile power supply control device according to claim 1. When the electric power obtained by multiplying time by the sum of currents detected by the current sum detection means exceeds a predetermined amount of power when the engine is off, the switching control means 3. The power supply control device for an automobile according to claim 1, wherein all the switching means provided between the DC accessory socket and the AC accessory socket are turned off . When the engine is off, when the power obtained by multiplying the current sum detected by the current sum detection means with time exceeds the amount of power smaller than the predetermined value, 4. The automobile power supply control device according to claim 3 , further comprising alarm generating means for generating an alarm so that both can be identified when a predetermined value is exceeded . When the engine is on, a current whose total current detected by the current total detection means is equal to or greater than a predetermined value continuously flows for a time shorter than the predetermined time, and the total current is predetermined. The vehicle power supply according to any one of claims 1 to 4 , further comprising an alarm generating means for issuing an alarm so that the alarm can be discriminated from each other when a current exceeding the predetermined value flows continuously for the predetermined time. Control device. The switching means is a normally closed relay;
In order for the switching control means to turn on, the relay closes when an on control signal is output, and when the on control signal stops to perform off control, the relay opens.
The automotive power supply control device according to any one of claims 1 to 5 , wherein the switching control means turns on the switching means when an ignition switch is in an accessory position or an on position.

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