Loudspeaker protection circuit
View Patent ↗A loudspeaker protection circuit comprises a rectification stage for receiving an input audio signal and producing a rectified output signal, a detection stage for passing the rectified output signal when the rectified output signal is greater than a predetermined level, a timing stage for receiving the rectified output signal from the detection stage and producing a time-varying charge signal, a regulation stage for producing a regulated output signal based on the input audio signal, an actuator stage for actuating a switch based on the time-varying charge signal and the regulated output signal, and an attenuation stage for attenuating an output audio signal when the switch is actuated.
1. A loudspeaker protection circuit comprising:
a rectification stage for receiving an input audio signal and producing a rectified output signal;
a detection stage for passing the rectified output signal when the rectified output signal is greater than a predetermined level;
a timing stage for receiving the rectified output signal from the detection stage and producing a time-varying charge signal;
a regulation stage for producing a regulated output signal based on the input audio signal;
an actuator stage for actuating a switch based on the time-varying charge signal and the regulated output signal; and
an attenuation stage for attenuating an output audio signal when the switch is actuated.
2. The loudspeaker protection circuit of claim 1 , further comprising a load balancing circuit balancing the load on the output audio signal when the switch is actuated.
3. The loudspeaker protection circuit of claim 1 , wherein the rectification stage includes a bridge rectifier circuit.
4. The loudspeaker protection circuit of claim 1 , wherein the detection stage includes a voltage divider circuit.
5. The loudspeaker protection circuit of claim 1 , wherein the timing stage includes a two-stage, retriggerable, charge-up resistive capacitive timer network.
6. The loudspeaker protection circuit of claim 1 , wherein the regulation stage includes a regulation device and a capacitive smoothing network.
7. The loudspeaker protection circuit of claim 1 , wherein the actuator stage includes a driver and an actuator controller.
8. The loudspeaker protection circuit of claim 7 , wherein the driver includes a hysteresis driver.
9. The loudspeaker protection circuit of claim 1 , wherein the attenuation stage includes a lamp.
10. The loudspeaker protection circuit of claim 1 , wherein the detection stage includes a plurality of detection stages operating in parallel.
11. The loudspeaker protection circuit of claim 1 , wherein the timing stage includes a plurality of timing stages operating in parallel.
12. The loudspeaker protection circuit of claim 1 , wherein the actuator stage includes a plurality of actuator stages operating in parallel.
13. The loudspeaker protection circuit of claim 1 , wherein the attenuation stage includes a plurality of attenuation stages operating in series.
14. A loudspeaker protection circuit comprising:
a rectification stage, including a bridge rectifier circuit, for receiving an input audio signal and producing a rectified output signal;
a detection stage, including a voltage divider circuit, for passing the rectified output signal when the rectified output signal is greater than a predetermined level;
a timing stage, including a two-stage, retriggerable, charge-up resistive capacitive timer network, for receiving the rectified output signal from the detection stage and producing a time-varying charge signal;
a regulation stage, a regulation device and a capacitive smoothing network, for producing a regulated output signal based on the input audio signal;
an actuator stage, including a driver and an actuator controller, for actuating a switch based on the time-varying charge signal and the regulated output signal;
an attenuation stage, including a lamp, for attenuating an output audio signal when the switch is actuated; and
a load balancing circuit for balancing the load on the output audio signal when the switch is actuated.
15. The loudspeaker protection circuit of claim 14 , wherein the driver includes a hysteresis driver.
16. A loudspeaker protection circuit comprising:
a rectification stage, including a bridge rectifier circuit, for receiving an input audio signal and producing a rectified output signal;
a plurality of detection stages operating in parallel, each including a voltage divider circuit, for passing the rectified output signal when the rectified output signal is greater than a predetermined level;
a plurality of timing stages operating in parallel, each including a two-stage, retriggerable, charge-up resistive capacitive timer network, for receiving the rectified output signal from the detection stage and producing a time-varying charge signal;
a regulation stage, a regulation device and a capacitive smoothing network, for producing a regulated output signal based on the input audio signal;
a plurality of actuator stages operating in parallel, each including a driver and an actuator controller, for actuating a switch based on the time-varying charge signal and the regulated output signal;
a plurality of attenuation stages operating in series, each including a lamp, for attenuating an output audio signal when the switch is actuated; and
a load balancing circuit for balancing the load on the output audio signal when the switch is actuated.
17. The loudspeaker protection circuit of claim 16 , wherein the driver includes a hysteresis driver.