Overload protection circuit for transducers
US5577126A · kind A · utility
Inventor
Key dates
| Filing date | Sep 26, 1994 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Sep 26, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention relates to an arrangement (1) for protecting transducer (3) which converts an electric signal into an acoustic or a mechanic signal against overload and destruction. The arrangement is connected to the electric terminals of the transducer (3) and changes the electric input signal under overload condition. A reference filter (6) connected with the electric input of the transducer provides a monitored signal x(t) related to the load of the transducer (3) to a controller (7). If the amplitude of the monitored signal x(t) exceeds an prescribed threshold value the controller (7) activates a feedback loop realized by the reference filter (6), multiplier (8) and summer (5). This invention provides an effective protection of the transducer with a minimum of elements by using the reference filter (6) as both a signal detector and a controlled attenuation element. Because the activated protection system has approximately the inverse transfer response of the reference filter the spectral components with the highest amplitude in x(t) are attenuated primarily.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.