JP3131884U - Auxiliary power supply for in-vehicle use - Google Patents

Abstract

A high output audio device A is operated with high quality sound quality.
SOLUTION: Main terminals T1a and T1b connected to a main battery BT mounted on a vehicle, and a capacitor C and an auxiliary battery B connected in parallel between the main terminals T1a and T1b are provided.
[Selection] Figure 1

Description

  The present invention relates to an in-vehicle auxiliary power supply device that is particularly suitable when mounted on a vehicle and using an in-vehicle audio device.

  In addition to conventional AM / FM tuners and cassette decks, high-quality audio devices such as CD decks and DVD decks are installed in the vehicle, so that high-quality music can be played and enjoyed during driving.

These in-vehicle audio devices are not only powered by the main battery (the so-called in-vehicle battery for engine ignition, hereinafter the same) mounted on the vehicle, but also powered from the auxiliary battery in conjunction with the vehicle key switch. Thus, it can be operated even when the vehicle is stopped (for example, Patent Documents 1 and 2). Recently, even in-vehicle audio devices, a plurality of speakers are operated at a high output of several tens of watts or more to reproduce high output music with high quality.
JP 2002-67836 A JP 2004-42731 A

  When such a conventional technology is used, the audio device can be operated while the vehicle is running and also when stopped by the auxiliary battery, but only one of the main battery and the auxiliary battery is used as a power source. There is a problem that the power capacity is insufficient and the sound quality at high output tends to deteriorate.

  Therefore, in view of the problems of the prior art, the object of the present invention is to use a large-capacity capacitor and an auxiliary battery in combination, so that even a high-power audio device with a maximum output of 100 W class has a high quality sound quality. An object of the present invention is to provide an in-vehicle auxiliary power supply device that can be stably operated.

  In order to achieve such an object, the configuration of the present invention includes positive and negative main terminals for connection to a main battery mounted on a vehicle, a capacitor connected in parallel between the main terminals, and an auxiliary battery. The main point is to connect the audio device to the main terminal.

  In addition, the positive / negative charging terminal connected to an auxiliary battery via a limiting resistor can be provided.

  Further, a voltmeter connected to the auxiliary battery via the photocoupler switch may be provided, and a positive and negative auxiliary terminal for supplying a voltage for operating the photocoupler switch may be provided, and a light emitting element for operation display connected to the auxiliary terminal May be provided.

  In such a configuration, since the capacitor and the auxiliary battery are connected in parallel between the main terminals, for example, the main battery is charged by connecting the main terminal to the main battery via a short-circuit protection fuse. be able to. On the other hand, by connecting the audio device to the main terminal, even high-powered music can be reproduced and output with extremely high sound quality. This is because the audio device at this time is supplied with power from a capacitor and an auxiliary battery in addition to the main battery, and the internal resistance of the power source as a whole can be sufficiently lowered to greatly improve the voltage regulation. In addition, since audio equipment mainly supplies large peak power from a capacitor and an auxiliary battery, it is assumed to be connected to the main terminal via a wire having a sufficiently large cross-sectional area.

  According to experiments, when operating an audio device with an output of 100 W class, an electrolytic capacitor having a constant voltage of 100 V or more and a capacity of 50000 μF or more (particularly preferably 80000 μF or more) is used as the main battery voltage of 12 V. It is preferable to use a plurality of equal capacities connected in parallel. The auxiliary battery is preferably a high-performance sealed lead battery with a 10 hour rate capacity of 16 Ah or more, a nominal short-circuit current of 1500 A or more, and an internal resistance of less than 8 mΩ.

  If a positive / negative charging terminal is provided, a capacitor | condenser and an auxiliary | assistant battery can be charged as needed by connecting an external charging device to a charging terminal. The limiting resistor prevents the charging current from becoming excessive, and also prevents the accident from expanding by limiting the short-circuit current in the event of a short-circuit accident.

  A voltmeter connected to the auxiliary battery is effective for monitoring the voltage of the auxiliary battery. The voltmeter may be a digital voltmeter of the smallest segment. By supplying the operating voltage to the positive and negative auxiliary terminals and turning on the photocoupler switch, the auxiliary battery is connected to the auxiliary battery and unnecessary consumption is reduced. To prevent. However, the voltage supplied to the auxiliary terminal may be, for example, the voltage of the accessory power supply of the vehicle supplied when the key switch of the vehicle is in the accessory position or the on position.

  The light emitting element connected to the auxiliary terminal can be used as a decorative light source in addition to displaying the operation of the auxiliary power supply.

  Hereinafter, embodiments of the invention will be described with reference to the drawings.

  The in-vehicle auxiliary power supply 10 is formed by connecting a capacitor C and an auxiliary battery B in parallel between positive and negative main terminals T1a and T1b (FIG. 1).

  Both electrodes of the auxiliary battery B are drawn to the positive and negative charging terminals T2a and T2b via the positive-side limiting resistor R1. The auxiliary battery B is connected to a voltmeter VM via a photocoupler switch PC. The photocoupler switch PC is connected to a voltage Va for operation from positive and negative auxiliary terminals T3a and T3b via a resistor R2. Is supplied. The auxiliary terminals T3a and T3b are connected to a light emitting element PL of an LED for operation display via a resistor R3.

  A main battery BT mounted on the vehicle is connected to the main terminals T1a and T1b via a fuse F for short-circuit protection, and an in-vehicle audio device A is connected. Further, the voltage Va of the accessory power supply L of the vehicle is supplied to the auxiliary terminals T3a and T3b. However, the accessory power L is supplied from the main battery BT via a relay contact ACC that is turned on by setting the key switch of the vehicle to the accessory position or the ON position.

  The auxiliary power supply 10 removes the audio device A, removes the fuse F, and connects a charging device (not shown) to the charging terminals T2a and T2b, so that the capacitor C and the auxiliary battery B are sufficiently charged for use. Next, when the audio device A is connected to the main terminals T1a and T1b, the fuse F is mounted, and the vehicle engine is started by operating the key switch, the voltage Va of the accessory power supply L is supplied to the auxiliary terminals T3a and T3b. Therefore, the light emitting element PL is turned on, the photocoupler switch PC is turned on, and the voltage V of the auxiliary battery B can be monitored via the voltmeter VM.

  Thereafter, when the audio device A is operated, since the audio device A is supplied with power by the capacitor C and the auxiliary battery B in addition to the main battery BT, it can be operated by a power source with extremely good voltage regulation. Operation with high sound quality is possible. Further, the capacitor C and the auxiliary battery B can be always charged together with the main battery BT via the alternator of the vehicle.

  An example of the evaluation test data of the auxiliary power supply device 10 is shown in FIG. However, FIG. 2 (A) is an example of the voltage / current characteristics of only the main battery BT mounted on the Honda Odyssey class vehicle, and FIG. 2 (B) shows the voltage / current when the auxiliary power supply 10 is used together. It is an example of a characteristic. The data shown in FIG. 2 is obtained by connecting 15 pieces of large aluminum electrolytic capacitors for audio AJ series 100V5600 μF manufactured by Nippon Chemi-Con as a capacitor C of the auxiliary power supply device 10 in a total of 84000 μF, and as an auxiliary battery B, Hawker Energy This is a case where a sealed lead-acid battery Cyclone G series 12V16Ah manufactured by Products is used.

  2A and 2B, since both the voltage fluctuation width and the voltage fluctuation waveform with respect to the rectangular wave current are improved, the harmonic component contained in the power supply voltage of the audio device A is reduced, and the power supply It can be seen that noise is reduced. In general, the in-vehicle main battery BT is charged by an alternator. However, ripples and noise due to the alternator are often superimposed on the output voltage of the main battery BT. In addition, a switching power supply is incorporated in the high output audio device A, and a large amount of switching noise is often generated due to the switching power supply. Therefore, by using the auxiliary power supply device 10 together, harmful noise, ripple, switching noise, and the like can be effectively suppressed.

Overall block circuit diagram Characteristics comparison diagram

Explanation of symbols

A ... Audio equipment B ... Auxiliary battery C ... Capacitor BT ... Main battery T1a, T1b ... Main terminal T2a, T2b ... Charging terminal T3a, T3b ... Auxiliary terminal VM ... Voltmeter PC ... Photocoupler switch PL ... Light emitting element R1 ... Limiting resistor

Utility model registration applicant Axon Data Machine Co., Ltd.
Attorney Tadaaki Matsuda, Attorney

Claims (4)

  A positive and negative main terminal for connecting to a main battery mounted on a vehicle, a capacitor connected in parallel between the main terminals, and an auxiliary battery are provided, and an in-vehicle audio device is connected to the main terminal. A vehicle-mounted auxiliary power supply.   The on-vehicle auxiliary power supply device according to claim 1, further comprising a positive and negative charging terminal connected to the auxiliary battery via a limiting resistor.   3. The vehicle-mounted vehicle according to claim 1, further comprising a voltmeter connected to the auxiliary battery via a photocoupler switch, and a positive and negative auxiliary terminal for supplying a voltage for operating the photocoupler switch. Auxiliary power supply for use.   4. The on-vehicle auxiliary power supply device according to claim 3, further comprising a light emitting element for operation display connected to the auxiliary terminal.

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