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DESCRIPTION JPS57152894

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DESCRIPTION JPS57152894
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of a
speaker protection circuit according to the present invention. Explanation of symbols of main
parts, 1 и и и и и и и и и и Temperature sensing element, и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и relay, Dl, D2 и и и и и и и.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
protection circuit. When the speaker is driven, if an excessive current flows in the speaker due to
an extreme deviation of the midpoint potential or an accident or the like, the voice coil etc.
overheat abnormally and the speaker is destroyed. Therefore, a protection circuit is provided to
protect the speaker. As such a protection circuit, there are one in which a temperature sensing
element is incorporated in the network to prevent thermal runaway, and one in which an
excessive input of the i30??7r?zp7V speaker is detected and the current supplied to the
speaker is interrupted. The former has disadvantages such as adversely affecting the network
and instability of operation, and the latter has the disadvantage that (b) path configuration
becomes complicated. An object of the present invention is to provide a speaker protection
circuit having a simple circuit configuration and reliable operation. In the speaker protection
circuit according to the present invention, the temperature sensing element is thermally coupled
to the speaker, and the relay supplied in response to the output of the temperature sensing
element is configured to interrupt the current supplied to the speaker. Hereinafter, an
embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a circuit diagram showing an embodiment of a speaker protection circuit according to
the present invention. In the figure, 1 is a temperature sensing element whose electric resistance
value changes according to temperature rise, and if the temperature sensing element 1 is ul, the
thermistor whose electric resistance value drops sharply when exceeding a certain set
temperature Can be used. The temperature sensing element 1-2-1131 is attached for thermal
coupling near the voice coil of the speaker 2 or the like. One end of the temperature sensing
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element 1 is connected to the positive side of the DC power supply H via the switch 3 in the
normally closed state, and the other end is connected to the negative side of the DC power supply
B via the relay 4. The break contact 4 h of the relay 4 is connected in series to the speaker 2 and
is opened when the relay 4 is activated to interrupt the current supplied to the speaker 2. On the
other hand, the make contact 4m of the relay 4 is connected in parallel to the temperature
sensing element 1, and is closed when the look relay 4 is activated. The switch F7 '::, 3f'-, 1jLf41CI) L = ? = 1 [mE [[t6 ░]: иии ? ? The resistor R0 and the light emitting diode D1 connected in
parallel are connected in parallel to ?71 / -4, and the light emitting diode I) + is in the operating
state of the circuit Display Further, a resistor R2 and a light emitting diode D2 connected in
series are connected in parallel to the direct current power supply B, and the light emitting diode
D2 indicates the consumption state of the direct current power supply B.
In such a configuration, if an abnormality -a-1132 occurs due to any cause and a temperature
rise occurs in the voice coil, magnetic circuit, frame or the like of the speaker 2, the temperature
sensing element 1 senses this and the resistance value is rapid Causes the relay 4 to operate. As a
result, the break contact 4b connected in series to the speaker 2 is opened, and the current
supplied to the speaker 2 is cut off. At the same time, the meter contact 4m is closed. Therefore,
even if the temperature drops and the resistance value of the temperature sensing element 1
becomes a dog, 5-1, the relay 4 is self-held and the protection operation continues unless the
switch 3 is pressed by L. Then, the cause of the abnormality is investigated and removed, and
then the switch 3 is pressed to cancel the self-holding of the relay 4 and drive of the speaker 2 is
performed again. As described in detail above, according to the present invention, it is possible to
provide a speaker protection circuit which has a simple circuit configuration and reliable
operation and does not affect the speaker and the network at all.
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