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Title:
PROTECTION CIRCUIT FOR POWER AMPLIFIER, POWER AMPLIFIER, AND LOUDSPEAKER UNIT
Document Type and Number:
WIPO Patent Application WO/2017/208307
Kind Code:
A1
Abstract:
The present invention is provided with: a first protection transistor (Q1), the emitter of which is connected to a first node (1); a first diode (D1) connected between the collector of the first protection transistor (Q1) and an output terminal (OUT); a second protection transistor (Q2), the emitter of which is connected to a second node (2); a second diode (D2) connected between the collector of the second protection transistor (Q2) and the output terminal (OUT); a first resistor (R1) and a thermistor (Th1), which are connected between the first node (1) and the second node (2); and a second resistor (R2) and a third resistor (R3), which are connected between the first node (1) and the collector of the second protection transistor (Q2). A voltage divided by means of the first resistor (R1) and the thermistor (Th1) is applied to the base of the second protection transistor (Q2), and a voltage divided by the second resistor (R2) and the third resistor (R3) is applied to the base of the first protection transistor (Q1).

Inventors:
FUJITA, Shinichi (Nakazawa-cho Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
Application Number:
JP2016/065919
Publication Date:
December 07, 2017
Filing Date:
May 30, 2016
Export Citation:
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Assignee:
YAMAHA CORPORATION (10-1, Nakazawa-cho Naka-ku, Hamamatsu-sh, Shizuoka 50, 〒4308650, JP)
International Classes:
H03F1/52; H03F3/26; H04R3/00
Attorney, Agent or Firm:
OHBAYASHI, Akira et al. (Ochanomizu Wing Building, 6th Floor 2-15-13 Hongo Bunkyo-k, Tokyo 33, 〒1130033, JP)
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