JPH0453162Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a backup power supply recovery device for restoring the backup power supply of electronic devices such as computers installed in automobiles.

BACKGROUND OF THE INVENTION In recent years, computers have been used for engine drive control, air conditioner control, etc. of automobiles. This computer uses detection signals from sensors installed at necessary locations on the vehicle and data stored in the computer's memory to control, for example, fuel injection control, electronic ignition control, idle rotation speed control, and temperature control inside the vehicle. It performs various controls. By the way, in order for the various electronic devices installed in a car to function properly, such as the above-mentioned computer, it is necessary to keep current flowing through the backup power circuit installed in each electronic device even when the engine is stopped. There is a need. Therefore, conventionally, a battery installed in an automobile is used as a power source for a backup power supply circuit, and power is constantly supplied from the battery to the backup power supply circuit.

Problems to be Solved by the Invention As mentioned above, if a battery installed in a car is used as a backup power source for a backup power supply circuit, the battery will continue to be consumed even when the engine is stopped. For this reason, if a car equipped with electronic equipment equipped with a backup power supply circuit is left on a ship for a long period of time for export, for example, the dark current flowing in the backup power supply circuit may cause the battery to run out. It was hot. For this reason, conventionally, a connector for separating the harness has been incorporated in the middle of the harness that connects the backup power supply circuit and battery of various electronic devices. When a car is shipped, the connector is separated and the backup power circuit of various electronic devices and the battery are separated to prevent the battery from draining. Also, when the car arrives at the export destination, the local dealer will connect the connectors that were separated at the time of shipping.
Backup power is being restored. However, as mentioned above, if a connector is provided on the harness and the backup power supply is turned on and off using this connector, this connector is usually installed in an inconspicuous position inside the vehicle because it is rarely used except when the vehicle is shipped. However, there was a problem in that the work of separating and connecting the connectors was extremely complicated. In addition, when the connector is incorporated into the harness in this way, there is a problem in that the cost increases.

Means for Solving the Problems A backup power supply recovery device mounted on an automobile includes a battery mounted on the automobile, a backup power supply circuit using the battery as a power source, and built into various electronic devices mounted on the automobile. The input side is connected to the + terminal of the battery, the output side is connected to the backup power supply circuit, and when a plurality of preset switches installed in the car are operated simultaneously, the self-holding circuit is closed. It consists of a self-holding circuit that connects the battery and the backup power supply circuit.

Function The backup power supply is restored by operating the switch, closing the self-holding circuit, and establishing continuity between the battery and the backup power supply circuit.

Embodiment FIG. 1 is a circuit diagram showing a first embodiment of the backup power supply recovery device according to the present invention. In the figure, 1 is the + terminal of the battery, and 2 is the backup In the power supply circuit, 3 is a first transistor, and 4 is a second transistor. The emitter of the first transistor 3 is connected to the positive terminal 1 of the battery, the collector to the backup power supply circuit 2, and the base to the collector of the second transistor 4 via a resistor 5. Further, the base of the second transistor 4 is a resistor 6,
It is connected to the backup power supply circuit 2 via 7, and its emitter is grounded. 8a and 8b are two normally open first and second push button switches connected in series between the positive terminal 1 of the battery and the base of the second transistor 4. The first and second pushbutton switches 8a and 8b include, for example, an electronic tuner 9 and a digital clock 1 incorporated in the dashboard of an automobile, as shown in FIGS. 4 and 5.
2 of the push button switches 8, 8... provided at 0
Use individual pieces. Further, the push button switches used as the first push button switch 8a and the second push button switch 8b are each equipped with a shorting piece having two internal contacts A and B connected to a regular load, as shown in FIG. and 2 interposed in the circuit connecting the positive terminal 1 of the battery and the base of the second transistor 4.
A shorting piece H having contacts D and E is integrally assembled. Then, when the push button switches 8a and 8b are pressed, the contacts A, B, and D provided on each shorting piece C, F,
It is arranged so that both hos shoot at the same time. The first and second transistors 3, 4 and the first and second push button switches 8a, 8b
A self-holding circuit is constructed by connecting the positive terminal 1 of the battery and the backup power supply circuit 2. Also, 11 is the first transistor 3 that is once turned on.
This is a normally closed break terminal that turns off the backup power supply circuit 2 once turned on by turning it off. As shown in FIG. 7, this break terminal 11 has two conductive patterns 13 provided on a printed circuit board 12, one end of which is connected to the + terminal 1 of the battery, and one end of which is connected to the emitter of the first transistor 3. 14 are connected by a break terminal 11 made of a spring material, and when opening the break terminal 11, for example, the holes 12a and 15a made in the printed circuit board 12 and the case 15 that houses the printed circuit board 12 are connected. By inserting the wire 16 and pushing up the break terminal 11 with the tip of the wire 16, the break terminal 1
Just open 1.

In the above circuit configuration, the first transistor 3 and the second transistor 4 are OFF in the initial state.
The + terminal 1 of the battery and the backup power supply circuit 2 are in an insulated state. Therefore, if the car is shipped in this state, no current will flow through the backup power supply circuit 2, thereby preventing the battery from draining. Further, when the first and second transistors 3 and 4 are in the OFF state, the first and second transistors
When the push button switches 8a and 8b are closed simultaneously, a voltage is applied from the positive terminal 1 of the battery to the base of the second transistor 4, so the second transistor 4 is turned on. Therefore, the first transistor 3 whose collector and base are connected to the second transistor 4 is also turned on, and the positive terminal 1 of the battery is electrically connected to the backup power supply circuit 2, so that the backup power supply circuit 2 is turned on. Also, after this, the first and second
Even if the push button switches 8a and 8b are opened, the base current of the second transistor 4 is guaranteed by turning on the first transistor 3, and the base current of the second transistor 4 is guaranteed by turning on the second transistor 4. Since the base current of 3 is guaranteed, the backup power supply circuit 2 remains in the ON state unless the power supply runs out. Also, when a car is completed, in order to check the finished product in the factory, the first and second pushbutton switches 8a and 8b are closed and the backup power supply circuit 2 is turned on, and then the circuit is returned to its initial state. To do this, open the break terminal 11 and turn off the first transistor 3.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention, in which 1 is a positive terminal of a battery, 2 is a backup power supply circuit, and 17 is formed so that a relay contact 18 closes when a coil 19 is energized. It is a relay. One terminal a of the relay contact 18 of this relay 17 is connected to the positive terminal 1 of the battery, and the other terminal b is connected to the backup power supply circuit 2. One terminal c of the coil 19 is connected to the positive terminal 1 of the battery via first and second push button switches 8a and 8b which are always open, and the other terminal d is grounded. Furthermore, a terminal b of the relay contact 18 connected to the backup power supply circuit 2 and a terminal c of the coil 19 connected to the positive terminal 1 of the battery are connected by a circuit 20. Reference numeral 11 denotes a break terminal interposed between the positive terminal 1 of the battery and the relay contact 18 of the relay 17, and the structure and function of this break terminal 11 are the same as in the first embodiment.

In the above circuit configuration, in the initial state, relay 1
7 coil 19 is not energized and relay contact 1
Since 8 is open, the backup power supply circuit 2 is
It is in the OFF state. In this state, when the first and second pushbutton switches 8a and 8b are closed simultaneously, the coil 19 is energized and the relay contact 18 is closed, so that the + terminal 1 of the battery and the backup power supply circuit 2 are electrically connected. The backup power supply circuit 2 is
Turn on. After that, even if the first and second pushbutton switches 8a and 8b are opened, current flows from terminal b of relay contact 18 to terminal c of coil 19, coil 19 maintains the excited state, and relay contact 18 Since it remains in the closed state, the backup power supply circuit 2 remains in the ON state unless the power supply runs out.

FIG. 3 is a circuit diagram showing a third embodiment of the present invention, in which 1 is the positive terminal of the battery, 2 is a backup power supply circuit, and 21 is a thyristor (hereinafter referred to as SCR).
). The anode of this SCR 21 is connected to the + terminal 1 of the battery, the cathode is connected to the backup power supply circuit 2, and the gate is connected to the + terminal of the battery via the normally open first and second push button switches 8a and 8b.
Each is connected to terminal 1. Reference numeral 11 denotes a break terminal interposed between the positive terminal 1 of the battery and the anode of the SCR 21, and the structure and function of this break terminal 11 are the same as in the first embodiment.

In the above circuit configuration, in the initial state, SCR2
1 is in the OFF state, and the battery +
Since the terminal 1 and the backup power supply circuit 2 are in an insulated state, the backup power supply circuit 2 is in an OFF state. Also, in this state, if the first and second push button switches 8a and 8b are closed simultaneously,
A voltage is applied to the gate of SCR21, and SCR21
Turn on. Therefore, the + terminal 1 of the battery and the backup power supply circuit 2 are electrically connected, and the backup power supply circuit 2 is turned on. After this, even if the first and second pushbutton switches 8a and 8b are opened, the SCR 21 will remain on until the power is turned off once it is turned on, so the backup power supply circuit 2 will not be turned on.
The condition will remain the same.

Effects of the Invention As described above, the backup power supply recovery device according to the present invention includes a self-holding circuit interposed between the positive terminal of the battery and the backup power supply circuit, which is installed in the electronic tube or digital clock mounted on the automobile. Since the switch is closed by pressing the push button switch and the backup power supply is restored, the work of restoring the backup power supply becomes very easy.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a first embodiment of a backup power supply recovery device according to the present invention, Fig. 2 is a circuit diagram showing a second embodiment, and Fig. 3 is a circuit diagram showing a third embodiment. It is. 4 and 5 are drawings showing an example of a device incorporating a push button switch used in the present invention, and FIG. 6 is a drawing showing the structure of the push button switch.
FIG. 7 is a sectional view showing the structure of the break terminal. 1...Battery + terminal, 2...Backup power supply circuit, 3...First transistor, 4...
Second transistor, 8a...first push button switch, 8b...second push button switch, 17...relay, 21...SCR (thyristor).

Claims (1)

[Scope of utility model registration request] A battery installed in a car, and a backup power supply circuit that uses the battery as a power source and is built into various electronic devices installed in the car, the input side is connected to the + terminal of the battery, and the output side is connected to the backup power supply circuit. connected, and
A backup power supply recovery system comprising a self-holding circuit that closes the self-holding circuit when a plurality of preset switches among switches installed in an automobile are operated simultaneously, and connects the battery and the backup power supply circuit to each other. Device.