JPH11222084A - Automatic power supply control device for car accessory/ car audio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device automatically controlling power supply from a battery of a car accessory/car audio not connected to an ACC power supply line. SOLUTION: An automatic power supply control device 10 is constituted by an extraction circuit 11 extracting an alternator noise component Vn included in output voltage Vout of a battery 2 in an automobile, control signal generating circuit 14 amplifying, rectifying and DC converting the extracted alternator noise component Vn to obtain a control signal S of DC voltage, and a relay switch 18 inserted in a memory power supply line 4 to perform ON/OFF switching of power supply to a power supply port of a car accessory 7 from the battery 2. By the control signal S generated from the alternator noise component Vn, power is supplied to the power supply port (and/or main power supply port of car audio) of the car accessory 7 from the battery 2 only when an engine is rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car accessory / car audio system for automatically turning on / off a power supply line from a car battery to a cigarette lighter power supply socket or a car audio power supply port serving as a car accessory power supply port. The present invention relates to an automatic power control device.

[0002]

2. Description of the Related Art Generally, a cigarette lighter power supply socket is provided around a driver's seat of a car, and a user can use this power supply socket not only for a cigarette lighter but also for a variety of car accessories such as a room lamp and a map lamp. It can be used as a mouth (hereinafter referred to as a car accessory power supply port).

The power supply from the battery to the car accessory power supply port varies depending on each automobile manufacturer and vehicle type, depending on whether the ignition switch ACC is ON / OFF or not.

FIGS. 3A, 3B, and 3C are wiring diagrams showing a power supply destination of a battery of an automobile. (A) is the most common interlocking type, and a battery 2 charged from an alternator 1 which is an engine driven AC generator.
Are connected to the memory power supply line 4 directly connected to the battery 2 which is always supplied irrespective of the engine ON / OFF (that is, regardless of the operation of the ignition switch 5), and the ACC ON / OFF of the ignition switch 5
ACC power supply line 6, whose power supply is regulated when OFF,
6 '(the car audio 8 of the ACC power line 6
The power supply line to the main power supply port is divided into a car audio power supply line 6 ′ and the power supply port of the car accessory 7 and the main power supply port of the car audio 8 are turned ON of the ACC of the ignition switch 5. / OFF is linked. Therefore, in this interlocking type, power is not supplied to the main power port of the car audio 8 and the power port of the car accessory 7 unless the ignition switch 5 is in the ACC state. However, the risk of running out of the battery is avoided.

The car audio 8 has a battery 2
Is also connected to the memory power supply line 4 directly connected to the power supply line. The memory power supply line 4 referred to here is a power supply line directly connected to the battery output of the vehicle and always supplied irrespective of the ON / OFF of the engine. Usually, the memory (RAM; random; This name is given because it is a power supply line for supplying a backup power supply for an access memory, a clock, a horn, and the like (these must always be supplied with power).

FIG. 3B shows a non-interlocked type. The output power line of the battery 2 charged from the alternator 1 is turned on / off by turning on / off the memory power line 4 and the ACC of the ignition switch 5. Although the supply is branched to a car audio power supply line 6 ′ whose supply is regulated, the power supply port of the car accessory 7 (usually a cigarette lighter power supply socket) is not linked with ON / OFF of the ACC of the ignition switch 5, It is directly connected to the memory power supply line 4.

[0007] Therefore, the power is always supplied from the memory power supply line 4 irrespective of whether the engine is on or off (in other words, regardless of the operation of the ignition switch 5). The power supply was supplied with power from a battery, and to turn it off, it was necessary to turn off the power switch of the car accessory. Otherwise, after shutting down the engine, the prolonged power consumption of the car accessories will drain the battery.

Next, as shown in FIG.
Ignition switch 5 ON without CC power line
There are a few vehicles in which only the memory power supply line 4 not linked to / OFF is directly connected to the power supply port of the car audio 8 or the car accessory 7. In this case, the engine
Each time N / OFF, the user has to separately turn on / off the power switch of the car audio 8 and the car accessory 7.

[0009]

SUMMARY OF THE INVENTION FIG.
The power switch operation of the car audio system 8 and the car accessory 7 in the power supply line (C) is troublesome for the user. Not a little car audio 8
Forget about turning off the power switch of the car accessory 7 and encounter the anxiety of running out of battery.

Therefore, even if the vehicle is as shown in FIGS. 3 (B) and 3 (C), the power switch operation of the car audio 8 and the car accessory 7 is not performed every time, but the ignition key 5 for starting the engine is used. Power switch of car accessories 7 and car audio 8 is turned on by operation,
Stop the engine (charging from the alternator 1 stops)
It is desirable for the user to turn off the power switch.

The present invention has been made in consideration of the above circumstances, and turns on the power supply from a battery to a car accessory / car audio of an automobile only when the engine is rotating, and stops the rotation of the engine. And an automatic power control device for a car accessory / car audio which is automatically turned off.

[0012]

SUMMARY OF THE INVENTION The present invention provides: (1) an extraction circuit for extracting an alternator noise component included in a battery output voltage of a vehicle having a car accessory power supply port connected to a memory power supply line directly connected to a battery; Amplify / rectify / DC the extracted alternator noise component
A control signal generating circuit for converting the control signal into a DC voltage control signal, and turning on / off power supply from the battery to the car accessory power supply port inserted into the memory power supply line
And a relay switch for performing FF switching.
The above object is attained by providing an automatic power control device for a car accessory, wherein the relay switch is controlled so as to be turned on when the alternator noise component is present and turned off when the alternator noise component is not present by the control signal.

(2) An extraction circuit for extracting an alternator noise component included in a battery output voltage of a vehicle having a car audio power supply port directly connected only to a memory power supply line directly connected to a battery, and the extracted alternator noise component Control signal generating circuit for amplifying, rectifying and DC converting the DC power into a DC voltage control signal, and a relay inserted into the memory power supply line for switching ON / OFF of power supply from the battery to the car audio power supply port An automatic power control device for a car audio, wherein the relay signal is controlled to be turned on when the alternator noise component is present and to be turned off when the alternator noise component is not present by the control signal. Solution to the Problems

[0014]

Embodiments of the present invention will be described with reference to the drawings. Note that the same members as those in the related art are denoted by the same symbols.

FIG. 1 is a circuit block diagram of an automatic power supply control device according to claims 1 and 2 of the present invention.

FIG. 2A is a wiring diagram showing a battery power supply destination of the automatic power control apparatus for a car accessory according to claim 1 of the present invention, and FIG. 2B is a wiring diagram showing a car power supply according to claim 2 of the present invention. It is a wiring diagram which shows the battery power supply destination of the automatic power supply control apparatus of audio.

First, the case of power control for the car accessory 7 shown in FIG. 3B will be described. As shown in FIG. 2A, the automatic power control device 10 operates between the memory power line 4 and the car accessory 7. Is inserted and wired.

As shown in FIG. 1, the automatic power supply control device 10 includes an extraction circuit 11 for extracting an alternator noise component Vn included in an output voltage Vout of a vehicle battery 2, and an extracted alternator noise component Vn.
Control signal generating circuit 14 which amplifies, rectifies, and DC converts the DC power into a DC voltage control signal S, and which is inserted into the memory power supply line 4 to turn on / off power supply from the battery 2 to the power supply port of the car accessory 7. And a relay switch 18 for switching off. The memory power supply line 4 is connected to a relay switch 18 as shown in FIG.
It is preferable that a noise filter 19 that removes noise components including the alternator noise component Vn (including switching noise from an air conditioner, a headlight, and the like) is appropriately interposed before the noise filter 19 (in the constituent elements of the present invention). Absent).

The extraction circuit 11 includes an AC component passing circuit 1
2 and a BPF (bandpass filter) 13. First, a DC voltage component (about 14
V) is removed to extract only the AC noise component, and this output is then output by the BPF 13 to the band of the alternator noise component Vn (approximately 800) which varies in proportion to the engine speed.
(Frequency band of 8 Hz to 8 KHz), and power ON / OFF of the air conditioner, headlight and horn in the automobile, which is a noise component of a higher band.
Unnecessary noise components generated when the switch is turned off and low-frequency swing components of several hundred Hz or less are removed.

Next, the control signal generating circuit 14 comprises a simple amplifying circuit 15, a rectifying circuit 16, and a DC converting circuit 17, and a DC voltage control signal S (output of which varies depending on the presence or absence of the alternator noise component Vn). Relay switch 1
8 with respect to the threshold value of the ON / OFF control voltage of 8 (changes to a high voltage / low voltage). Of course, the voltage level of the control signal S may be a DC-converted voltage as it is, or may be converted to a predetermined voltage H / L level through an appropriate logic circuit.

Next, the relay switch 18 converts electrical energy into mechanical energy to open and close the contacts mechanically, SCR (silicon controlled rectifier), GT
A thyristor such as O or triac or a transistor switching circuit may be used. The control signal S is connected to control terminals of these relay switches 18.

With the above circuit configuration, when the engine is rotating and the alternator 1 is generating power, the control signal S is H (or L) since the output Vout of the battery 2 always contains the alternator noise component Vn. ; Depending on the condition of the relay switch), and the relay switch 18 is turned on.
Then, the DC voltage from which noise has been removed by the noise filter 19 from the battery 2 through the memory power supply line 4 is supplied to the car accessory 7 through the relay switch 18, and conversely, the engine stops and the alternator noise component When Vn disappears, the control signal S becomes L (or H), so that the relay switch 18 is turned off and the power supply to the car accessory 7 is stopped.

Next, in the case of the automobile without the ACC power supply line shown in FIG. 2B, since the main power supply port of the car audio system 8 is also supplied with power from the memory power supply line 4, this power supply is applied to the present invention. It is necessary to perform ON / OFF control through the automatic power supply control device 10 (naturally, the power supply port of the car accessory 7 is also controlled). Also in this case, the power supply to the main power port of the car audio 8 and the power port of the car accessory 7 is controlled by the control signal S in exactly the same procedure.

As described above, the car accessory / car audio automatic power supply control device 10 according to the present invention does not use a microcomputer, and is a low-cost car accessory power supply port or car audio power supply not connected to the ACC power line. Since the ON / OFF control of the main power supply port is performed according to the presence or absence of rotation of the engine, the risk of running out of the battery is eliminated, and the effect that the power switch of a car accessory or car audio can be kept on and off can be obtained.

As described above, according to the present invention, the presence or absence of the rotation of the engine is detected by the noise component of the alternator superimposed on the battery output voltage, thereby automatically controlling the power supply of the car accessory / car audio. There are ideas that you do not see.

[0026]

According to the present invention, an automatic power supply control apparatus for a car accessory / car audio of an automobile detects a start / stop state of an engine by extracting generator noise (alternator noise component) generated by an alternator.
ON / O of a relay switch inserted into a power supply line by a control signal generated from the alternator noise component
Since the FF control is performed, there is an excellent effect that the battery can be prevented from running down even when the power switch of the car accessory or the car audio is kept on.

The automatic power supply control device has an advantage that it can be realized at low cost because it does not use complicated and expensive parts such as a microcomputer.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of an automatic power control device according to claims 1 and 2 of the present invention.

FIG. 2A is a wiring diagram showing a battery power supply destination of the automatic power control apparatus for a car accessory according to claim 1 of the present invention, and FIG. 2B is a wiring diagram of a car audio according to claim 2 of the present invention; FIG. 3 is a wiring diagram illustrating a battery power supply destination of the automatic power control device.

FIG. 3 is a wiring diagram showing an example of a power supply destination of a vehicle battery, wherein (A) is a type that is linked to the most common ignition switch ACC, (B) is a type that is not linked, and (C) is no ACC. This is the case of only the memory power supply line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Alternator 2 Battery 4 Memory power supply line 5 Ignition switch 6 ACC power supply line 6 'Car audio power supply line 7 Car accessory 8 Car audio 10 Automatic power supply control unit 11 Extraction circuit 12 AC component passing circuit 13 BPF (bandpass filter) 14 Control signal Generation circuit 15 Amplification circuit 16 Rectification circuit 17 DC conversion circuit 18 Relay switch 19 Noise filter Vout Output voltage Vn Alternator noise component S Control signal

Claims (2)

[Claims] 1. An extraction circuit for extracting an alternator noise component included in a battery output voltage of a vehicle having a car accessory power supply port connected to a memory power supply line directly connected to a battery, and amplifying and rectifying the extracted alternator noise component. A control signal generation circuit for converting a DC voltage into a control signal of a DC voltage, and a relay switch inserted into the memory power supply line for switching ON / OFF of power supply from the battery to the car accessory power supply port. An automatic power supply control device for a car accessory, wherein the relay switch is controlled so as to be turned on when the alternator noise component exists by the control signal and turned off when the alternator noise component does not exist. 2. An extraction circuit for extracting an alternator noise component included in a battery output voltage of a vehicle having a car audio power supply port directly connected only to a memory power supply line directly connected to a battery, and amplifying and extracting the extracted alternator noise component. A control signal generation circuit for rectifying and DC converting to a control signal of a DC voltage, a relay switch inserted into the memory power supply line to perform ON / OFF switching of power supply from the battery to the car audio power supply port; ON when there is the alternator noise component by the control signal, and OFF when there is no alternator noise component
An automatic power control device for car audio, wherein the automatic power control device controls the relay switch.