JP2001322515A - Vehicular dark current reducing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent flowing of dark current in a battery causing wasteful consumption of electric power due to feeding of a +B power source of a vehicle to an apparatus even after turning off an ACC power source and finishing a post-processing of a deck mechanism part by mxcrocomputer control. SOLUTION: When an ACC power source detecting part 16 detects a turning off of the ACC power source, on the basis of its OFF signal, a microcomputer part 14 stores data stored in an internal memory into an EEPROM 17, and after performing a post-processing of a deck mechanism part 13, it controls a control switch 18 for cutting off feeding of the +B power source to a power source part 12. Since the +B power source inside the apparatus is cut off as soon as the post-processing of the deck mechanism part 13 is finished, wasteful consumption of the battery can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for reducing a dark current of a battery in a vehicle electronic device such as a car audio device, an audio video device, and a navigation device.

[0002]

2. Description of the Related Art A power supply for a vehicle electronic device using a battery includes a + B power supply directly supplied from a battery and an ACC which can be used when an accessory switch is turned on so as to be compatible with various vehicle electronic devices. Two power supplies, a power supply and a power supply, are provided. FIG. 4 shows an audio head unit (H) in a conventional car audio device.
/ U). The power supply unit 2 of the audio head unit 1 receives a + B power supply of the vehicle and supplies a required voltage to a deck mechanism unit 3 and a microcomputer unit 4 which are power mechanism units such as a CD drive device. The + B power is also supplied to a power unit 5 that supplies power to an audio amplifier circuit of the car audio device. + B power supply of vehicle and A
The on / off state of the CC power supply is detected by the power supply detection unit 6. The microcomputer unit 4 is supplied with a necessary voltage from the power supply unit 2, and performs post-processing for returning the deck mechanism unit 3 to the initial state when the power detection unit 6 detects + B power off. When the power supply detecting unit 6 detects that the ACC power supply is turned off, the audio head unit 1 enters a non-operation state and enters a standby state.

Next, the operation of the audio head unit 1 will be described with reference to FIG. In the timing chart of FIG. 5, the + B power supply of the vehicle indicates a state from when the battery is connected to when the battery is removed. When the + B power supply of the vehicle is turned on, the + B power supply in the audio head unit (H / U) 1 is also turned on, whereby the power supply unit 2 is turned on, and the microcomputer unit 4 and the power unit 5 are turned on. Here, when the ACC power supply of the vehicle is turned on and the power supply detection unit 6 in the audio head unit 1 detects that the ACC power supply is turned on, the microcomputer unit 4 performs standby control of the power unit 5 based on the signal. In this state, when the power switch of the audio device is turned on,
The audio amplifier circuit operates to receive radio broadcasts and
D, reproduction of a cassette tape or the like is performed. Thereafter, when the power supply detecting section 6 detects that the ACC power supply of the vehicle is turned off, the microcomputer section 4 sets the audio amplifier circuit to a non-operating state. After the post-processing for restoring the initial state is performed, the microcomputer itself executes the end processing. This post-processing is always executed when the + B power supply is turned off, but is not executed when the deck mechanical unit 3 is not used at all.

[0004]

However, in the conventional audio head unit 1 described above, the A
Even after the CC power supply is turned off and the microcomputer unit 4 deactivates the circuit unit of the audio device, the + B power supply of the vehicle remains connected, so that current flows through the audio head unit 1 and the battery Power is wasted.

The present invention solves such a conventional problem and provides a vehicle dark current reduction method and apparatus capable of suppressing the dark current of a battery when an electronic device is not used.

[0006]

According to the present invention, there is provided a method for reducing a dark current for a vehicle, the method comprising: when the ACC power supply of the + B power supply and the ACC power supply supplied to the vehicle electronic equipment is turned off.
After performing necessary post-processing in the electronic device on the basis of the OFF signal of the ACC power supply, the + B power supply is shut off. Since the internal + B power supply is shut off,
It is possible to prevent useless consumption of battery power.

[0007] Further, a dark current reducing device for a vehicle according to the present invention includes:
A power supply unit connected to the + B power supply and the ACC power supply of the vehicle and supplying a power supply voltage to a power mechanism unit and a microcomputer unit of the electronic device mounted on the vehicle; and an ACC power supply detection for detecting on / off of the ACC power supply The microcomputer unit, by the ACC power supply off signal from the ACC power detection unit, writes the data held in the internal memory to another memory, and causes the power mechanism unit to execute necessary post-processing, After the post-processing is completed, the supply of the + B power supply to the power supply unit is cut off. With this configuration, the + B power supply inside the electronic device is shut off as soon as the post-processing of the power mechanism unit by the microcomputer unit is completed, so that wasteful consumption of battery power can be prevented.

[0008] Further, a dark current reducing device for a vehicle according to the present invention includes:
The power supply unit normally supplies a power supply voltage to the power mechanism unit and the microcomputer unit using the ACC power supply, and the + B power supply of the vehicle is connected to the ACC power supply of the vehicle.
Since it is used only for post-processing when the power is turned off, useless consumption of battery power when the ACC power is turned off can be prevented.

Further, the dark current reducing device for a vehicle according to the present invention comprises:
In a state where the + B power is cut off by the microcomputer, when the ACC power detector detects that the ACC power is turned on, the microcomputer releases the cutoff of the + B power, When the ACC power supply is turned on again, the post-processing by the + B power supply when the ACC power supply is turned off can be performed by also turning on the + B power supply inside the electronic device.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a dark current reducing device for a vehicle according to an embodiment of the present invention. The description will be made by taking an audio head unit of a car audio device as an example similarly to a conventional example. In FIG. 1, a power supply unit 12 of an audio head unit 11 receives a + B power supply and an ACC power supply of a vehicle, and normally supplies a required voltage by an ACC power supply and a post-processing by a + B power supply, and supplies a necessary voltage to a power mechanism of the audio device. Deck mechanism section 13 and microcomputer section 1
4 The ACC power of the vehicle is supplied to a power supply unit 12, a power unit 15 including a power IC for supplying power to an audio amplifier circuit of the car audio device, and an ACC power detection unit 16. The microcomputer unit 14 controls the operation of each unit, and when the ACC power detection unit 16 detects that the ACC power is off, the work data and the setting data stored in the internal memory are backed up by the EEPROM.
In addition to writing to M17, necessary post-processing for returning the deck mechanism unit 13 to the initial state is performed, and after the processing is completed, the control switch 18 is turned off to cut off the supply of the + B power supply to the power supply unit 12. Instead of the EEPROM 17, another non-volatile memory can be used, or a volatile memory of a type that is stored and held by a dedicated battery can be used.

Next, the operation of this embodiment will be described with reference to the timing chart of FIG. 2 and the flowchart of FIG. In FIG. 2, the + B power supply of the vehicle is:
As in the conventional example, a state from when the battery is connected to when the battery is removed is shown. When the + B power supply of the vehicle is turned on, the control switch 18 is in an off state in a normal state, so that the audio head unit (H / U) 1
The + B power supply in 1 remains off. Here, the ACC power supply of the vehicle is turned on and the audio head unit 11 is turned on.
When the ACC power is supplied to the power supply (step S1), the power supply unit 12 operates (step S2), whereby the microcomputer unit 14 also becomes operable (step S3). Microcomputer part 1
4 turns on the control switch 18 to supply + B power to the power supply unit 1
2 (step S4) and the power unit 15
To control standby. Thereafter, both the ACC power and the + B power are supplied to the power supply unit 12 until the control switch 18 is turned off. Then, when the power switch of the audio head unit 11 is turned on, the audio head unit 11 is in the operating state, and the audio device can play a CD or receive a broadcast (step S5). Thereafter, when the ACC power supply of the vehicle is turned off, the ACC power supply detection section 16 detects this (step S6), and the signal is used as a trigger to trigger the microcomputer section 14.
Performs post-processing for returning the deck mechanism unit 13 to the initial state using the + B power supply (step S7), and transmits the work data and setting data held in the internal memory to the EEPR.
Writing to the OM 17 (step S8), the control switch 18 is turned off, the supply of the + B power to the power supply unit 12 is cut off, and the process is terminated (step S9). The time required for post-processing of the deck mechanism 13 depends on the state in which the deck mechanism 13 is stopped. If the audio device is not used at all while the ACC power is turned on, the post-processing becomes unnecessary.

When the ACC power supply detecting section 16 detects that the ACC power supply has been turned off and the microcomputer section 14 cuts off the + B power supply, the power supply voltage is not supplied to each section of the audio head unit 11, so that this audio head The dark current of the battery in unit 11 goes to zero. When the ACC power supply is turned on again in this state, the ACC power supply is supplied to the power supply unit 12 and the power supply unit 15, and the deck mechanism unit 13 and the microcomputer unit 14 are supplied with a predetermined power supply voltage from the power supply unit 12 and become operable. Becomes Then, the microcomputer unit 14 turns on the control switch 18 and the power supply unit 1
2 is supplied with + B power of the vehicle. Hereinafter, the same operation as described above is repeated. The + B power supply is connected to the control switch 18.
After being cut off by the ACC power supply detection unit 16, the ACC power supply detection unit 16
An IC of a type that detects self-recovery by ACC voltage and detects ACC power-on is used.

As described above, according to the present embodiment, AC
When the C power supply detecting unit 16 detects that the ACC power supply is turned off, the microcomputer unit 14 uses the trigger as a trigger to store the data held in the internal memory in the EEPROM 17, perform post-processing of the deck mechanism unit 13, and then switch the control switch 18.
Is turned off to cut off the supply of the + B power to the power supply section 12, so that the battery dark current can be reduced to zero when the electronic device is not used, and unnecessary consumption of the battery when the ACC power is off can be prevented. it can.

The above-described embodiment is an example in which the present invention is applied to a car audio apparatus. However, the present invention uses both a + B power supply and an ACC power supply as power supplies.
The present invention can be applied to other vehicle electronic devices that require post-processing when the CC power is turned off.

[0015]

As described above, according to the present invention, when the ACC power supply of the + B power supply and the ACC power supply supplied to the vehicle electronic equipment is turned off, the electronic equipment is controlled based on the ACC power supply off signal. After performing necessary post-processing,
Since the B power supply is cut off, the dark current of the battery after the operation of the electronic device can be reduced to zero,
It is possible to prevent useless consumption of the battery when the C power supply is turned off.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an audio head unit according to an embodiment of the present invention.

FIG. 2 is a timing chart showing an operation of the audio head unit according to the embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of the audio head unit according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an audio head unit in a conventional example.

FIG. 5 is a timing chart showing an operation of an audio head unit in a conventional example.

[Explanation of symbols]

 Reference Signs List 11 audio head unit 12 power supply section 13 deck mechanism section 14 microcomputer section 15 power section 16 ACC power supply detection section 17 EEPROM 18 control switch

Claims (4)

[Claims] 1. When the ACC power supply of the + B power supply and the ACC power supply supplied to the vehicular electronic equipment is turned off, necessary post-processing in the electronic equipment is performed based on the off signal of the ACC power supply. A dark current reducing method for a vehicle, wherein the + B power supply is shut off later. 2. A power supply connected to a + B power supply and an ACC power supply of a vehicle and supplying a power supply voltage to a power mechanism and a microcomputer of electronic equipment mounted on the vehicle;
An ACC power detection unit for detecting on / off of a CC power supply, wherein the microcomputer unit comprises:
When the C power supply is detected, the data held in the internal memory is written to another memory, and the power mechanism unit performs necessary post-processing. After the post-processing is completed, the power supply unit of the + B power supply is completed. Dark current reducing device for a vehicle, characterized in that supply to the vehicle is cut off. 3. The vehicular dark current reduction device according to claim 2, wherein the power supply unit normally supplies a power supply voltage to the power mechanism unit and the microcomputer unit by the ACC power supply. 4. When the ACC power supply detecting section detects that the ACC power supply is turned on in a state where the + B power supply is cut off by the microcomputer section, the microcomputer section releases the cutoff of the + B power supply. The vehicle dark current reducing device according to claim 2 or 3, wherein