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DESCRIPTION JPS50155943

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DESCRIPTION JPS50155943
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a conventional power
amplifier protection circuit, and FIG. 2 is an embodiment of a power amplifier protection circuit
according to the present invention. E · u rake contact, 8 · · · · · · · · · · make contact. Fig. 2-ii 3-11
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a power amplifier security circuit in which a relay contact is connected in series with a power
amplifier output-1 path. Conventionally, in the power amplifier maintenance circuit, a relay
contact is serially connected in series with the output path of the power amplifier, the power
amplifier e, this relay contact is opened in abnormal operation, and the power amplifier, negative
# 1 etc. The toe 1 path as shown in FIG. 1 which is shown in FIG. 1 to be protected generates
sparks when the relay contact is opened in a state in which the current flows to the 9 side such
as a speaker, and the relay contact becomes remarkable (1) '' I was damaged. Specifically,
referring to FIG. 1111, 1 is an input signal source, 2 # -i power amplifier, 3Fi holding circuit, 4 is
a relay, 4aFi relay coil, 5 # i speaker. Further, one end of the speaker whose wholesale end is
grounded is connected to the center contact 6 of the relay 4 and the break contact 7 is connected
to the output end of the make contact 8Fi power amplifier 2 of the on-one. In the Km-influenced
single-port, one-path configuration, the 1k relay coil of the relay 4 is detected when the Ik
current passage of the power amplifier 2 when the power is off is detected, or when the power is
turned off. The power supply to 4a is released, and the MP connection of the center contact point
6 and the make contact 8 is switched to the break contact 7 and the node 1, and the power
amplifier 2 and the speaker S are maintained. However, when current flows through the speaker
5 at that time, a spark is naturally generated, and the spark of this kind causes the indeterminate
shadow carbon to be accumulated in the form of a letter 1 in the direction of this contact.
Although this carbon is more likely to cause sparks, it accelerates the bad phenomenon and
depletes the contact point significantly, causing a significant increase in corrosion resistance. (2)
The present invention is made to remedy the above-mentioned drawbacks, and an embodiment
10-04-2019
1
thereof is clarified using FIG. That is, a spark preventing resistor R is connected to the center
contact point 6 and the meter contact point 8 of the conventional circuit shown in the present
invention Fil1M1 and the one break contact point 7 is grounded. □□ so that the center contact
6 of the relay 4, the contact point 1 and the O 扮 V are disconnected, and the break point is
continued to a new point を 通 し て through a newly connected resistor R It prevents current
from getting into the contacts and causing sparks. Since the output signal #i resistance R of
[power amplifier 2 or 11 revisions] is extended to the break contact plate so as to flow into the
ground, no sound is generated in the speaker 5 during the path 8101 path 301 . In addition, it is
possible to use one that is obtained by connecting 111 fil of a resistor R used for this spark
prevention and a capacitor to 111 fil.
As described above, according to the present invention, the relay contact failure can be
eliminated at a low cost, and the reliability of the wIi path using the relay can be extremely
enhanced.
10-04-2019
2
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