Speaker protection circuit
A technology for protecting circuits and speakers, which is applied in the layout of amplifier protection circuits, transducer circuits, amplifiers, etc., and can solve problems such as leakage and speaker 121 damage.
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no. 1 approach
[0039] FIG. 1 is a circuit diagram of a BTL amplifying device including a speaker protection circuit according to a first embodiment of the present invention. In FIG. 1 , an input signal is input to an input terminal 4 via a coupling capacitor 1 . The signal Vsin input to the input terminal 4 is supplied to the first non-inverting amplifying circuit 9 as an input signal. The capacitor 2 is connected to the first reference bias terminal 5 connected to the other input terminal of the first non-inverting amplifying circuit 9 . In addition, the capacitor 3 is connected to the second reference bias terminal 6 . In addition, the first bias terminal 7 outputs a first reference voltage (that is, the voltage of the first reference bias terminal 5 ) VREF1 . In addition, the second bias circuit 8 outputs VREF2 as a second reference voltage. The first non-inverting amplifying circuit 9 uses VREF1 as a reference potential. In addition, the first level shift circuit 10 generates VREF3 a...
no. 2 approach
[0055] 2 is a circuit diagram of a BTL amplifying device including a speaker protection circuit according to a second embodiment of the present invention. In FIG. 2 , the same reference numerals are assigned to the same components as those of the first embodiment shown in FIG. 1 , and overlapping descriptions are omitted. The description will focus on newly added components in the circuit shown in FIG. 2 .
[0056] In FIG. 2, the second voltage comparator 34 compares the first reference voltage VREF1 with the second threshold voltage V2. In addition, the second threshold voltage V2 is set to a value larger than the threshold voltage (first threshold voltage) V1 of the first voltage comparator 30 . That is, there is a relationship of V1<V2.
[0057] In addition, the AND circuit 36 performs a logical product operation on the output signal of the first voltage comparator 30 and the output signal of the second voltage comparator 34 . The output signal Vcpa of the AND circuit ...
no. 3 approach
[0069] 3 is a circuit diagram of a BTL amplifying device including a speaker protection circuit according to a third embodiment of the present invention. In FIG. 3 , the same symbols are assigned to the same components as those in the second embodiment shown in FIG. 2 , and repeated descriptions are omitted. The description will focus on newly added components in the circuit shown in FIG. 3 .
[0070] In the circuit of FIG. 3, the window comparator 37 is the same as that described in the second embodiment, and its specific circuit configuration is shown in FIG. 4A. In addition, a second window comparator 39 having the same configuration as the window comparator 37 is added to the circuit shown in FIG. 3 , and a specific circuit configuration example thereof is shown in FIG. 4B .
[0071] In addition, a low-pass filter 38 that smoothes the signal Vsin of the input terminal 4 to output a DC voltage is provided, and the output voltage Vdet is input to the second window comparato...
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