close

Вход

Забыли?

вход по аккаунту

JPH0574100

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0574100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle audio apparatus, and more particularly to detecting a fuse blow of a stereo singlechannel power amplifier and interrupting the power supply to the other channel power amplifier.
Vehicle acoustic apparatus suitable for
[0002]
2. Description of the Related Art As a conventional on-vehicle acoustic apparatus, for example,
one having a configuration as shown in FIG. 2 is provided.
[0003]
In the figure, 1 is an L channel power circuit, 2 is an R channel power circuit, 3 is an L channel
power amplifier, 4 is an R channel speaker, 7 is an L channel fuse, and 8 is an R channel fuse.
[0004]
A block configuration for amplifying stereo L and R channel signals with a power amplifier
having independent power supply circuits supplies power to both power amplifiers 1 and 2 with
L and R channel speakers 5 and 6 connected to the load. The L channel fuse circuit 7 and the R
channel fuse circuit 8 are connected to the L channel power circuit 1 and the R channel power
circuit 2, respectively, between the battery and the battery.
10-05-2019
1
[0005]
If any failure occurs in either of the power amplifiers 3 and 4 of both channels connected as
described above and a large current flows, the L channel fuse 7 or the R channel fuse 8 is melted
and broken. The L channel power amplifier 3 or R channel power amplifier was to be protected.
[0006]
However, in the conventional on-vehicle acoustic apparatus, as shown in FIG. 2, in order to
protect the power amplifiers 3 and 4 of both channels, the power supply circuits 1 and 2 of both
channels are used. The L channel fuse 7 and the R channel fuse 8 inserted between the power
supply and the battery are to be blown. For example, the single-channel power amplifier 3 or 4
has a failure and the corresponding L channel Even if the fuse 7 or R channel fuse 8 is blown, the
power amplifiers 3 or 4 of the other channels continue to operate without powering down, so if
the use makes balance adjustment, the volume of the L channel is extremely reduced. If it is
heard as monaural, it is not known that the fuse 7 on the L channel side has broken due to
running noise etc. and the condition is maintained as it is There is disadvantage that have the
potential to malfunction, such as cutting the fuse to the R channel side is generated.
[0007]
The present invention has been made in view of the above-described point, and the purpose
thereof is to eliminate the drawbacks of the conventional example and to shut off the power
supply of all the power amplifiers even if either of the two channel fuses is cut. To provide the
user with an on-vehicle acoustic device that notifies the user of a blown fuse and prevents the
reoccurrence of the failure of the power amplifier in operation.
[0008]
SUMMARY OF THE INVENTION In the vehicle-mounted audio device of the present invention,
battery power is independently supplied to two power amplifiers for amplifying L and R channel
signals of stereo signals, and the respective powers are provided. In a vehicle-mounted acoustic
device in which a fuse is connected to a power supply circuit of an amplifier, a voltage detection
circuit for detecting load-side voltage levels of both fuses connected to the power supply circuit
of the power amplifier, and a detection output of the voltage detection circuit Provided with a
power supply prohibition circuit that shuts off the power supply circuit of each of the L and R
channel power amplifiers when
[0009]
According to the present invention, battery power is supplied independently to two power
amplifiers for amplifying L and R channel signals of a stereo signal, and a fuse is connected to the
10-05-2019
2
power supply circuit of each power amplifier. In the vehicle-mounted acoustic device, the voltage
detection circuit for detecting the load-side voltage level of both fuses connected to the power
supply circuit of the power amplifier and the L and R channels when the detection output of the
voltage detection circuit disappears Since the power supply inhibition circuit for interrupting the
power supply circuit of each power amplifier is provided, if any fuse of the L and R channel
power amplifier power supply circuits is cut, the power amplifier power supply circuit on the
channel side where the fuses are not cut By blocking the power supply to the power amplifier, it
is possible to prevent unnecessary failures from reoccurring It is possible to inform the blown
fuse to the user along with the made.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehiclemounted acoustic device according to the present invention will be described based on FIG.
The same parts as those in the conventional example are indicated by the same reference
numerals, and the description thereof is omitted.
[0011]
FIG. 1 is a block diagram showing an embodiment of the present invention.
[0012]
In the figure, 9 is a voltage detection circuit and 10 is a power supply inhibition circuit.
[0013]
Similar to the prior art, the circuit is connected to voltage detection circuit 9 from the load side of
L channel fuse 7 and R channel fuse 8 connected between both channel power supply circuits 1
and 2 and the battery, respectively. The detection output of the detection circuit 9 is connected
to the power supply prohibition circuit 10, and the output of the power supply prohibition circuit
10 is connected to the power supply circuits 1 and 2 of both channels.
[0014]
The operation of the block configured as described above will be described. The voltage detection
circuit 9 detects the battery voltage applied to the power supply circuits 1 and 2 of both
10-05-2019
3
channels, and adds it to the power supply circuits 1 and 2 of both channels. When there is a
battery voltage level to be detected, it is detected as "H" level, and when battery voltage level
disappears, it is detected as "L" level.
[0015]
For example, if the L channel power amplifier 3 fails and a large current flows in the L channel
power supply circuit 1 and the L channel fuse 7 is cut, the voltage detection circuit 9 detects the
battery voltage as the "L" level. The voltage detection circuit 9 causes the power supply inhibition
circuit 10 to output a signal to shut off the power supply from the power circuits 1 and 2 of both
channels to the power amplifiers 3 and 4.
[0016]
Accordingly, since the power supply to the R channel power amplifier 4 which has been normally
operated is also cut off by the R channel power circuit 2, no sound is output from both channel
speakers 5 and 6 to the user. It is possible to notify that one of the two power amplifiers 3 and 4
has a failure and to prevent the failure of the R channel power amplifier 4 which has not failed.
[0017]
In this way, if either of the L and R channel fuses 7 and 8 is blown, the power supply to the single
channel power amplifier can be cut off to prevent a failure from occurring.
[0018]
Further, in this embodiment, when either of the two channel fuses 7 and 8 is broken, the power
supply to the channel power amplifier 4 on the uncut side of the fuse is cut off to notify the user.
When a signal is output from the voltage detection circuit 9, the light emitting diode may be
turned on or a buzzer may be sounded.
[0019]
According to the in-vehicle acoustic device of the present invention, since it is configured as
described above, the following effects can be obtained.
[0020]
Since the power supply to the power amplifier on the operating side is cut off when either of the
two channel fuses is cut, the user does not have an audio output from any of the channel
speakers and the fuses are immediately removed. The effect of being notified that it has been cut
10-05-2019
4
[0021]
Further, there is also an effect that it is possible to prevent the risk of failure of one channel
power amplifier in normal operation.
Furthermore, it has excellent features such as simple configuration and easy implementation.
10-05-2019
5
1/--страниц
Пожаловаться на содержимое документа