Loudspeaker protection circuit responsive to temperature of loudspeaker driver mechanism
US6647120B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 2002 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Apr 1, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thermal protection circuit for a loudspeaker system includes a load device that is connected in series with a loudspeaker driver mechanism, and a thermally sensitive resettable switch that is connected in parallel with the load device and thermally connected to the loudspeaker driver mechanism, such that heat generated by the loudspeaker driver mechanism is at least conductively transferable to the switch. The switch is changeable between a closed state wherein the load device is at least substantially bypassed, and an open state wherein the electrical signal from an amplifier or crossover circuit is at least substantially directed through the load device when a temperature of the switch is above a predetermined temperature and the electrical signal is above a predetermined signal level. As the temperature of the loudspeaker driver mechanism increases, the temperature of the switch also increases, which in turn decreases the signal level required to trip the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.