| 摘要 |
An electronic battery-powered hearing instrument comprises a first power supply terminal and a second power supply terminal arranged to contact a battery, a rectifier circuit for providing a positive supply voltage (Up) and a negative supply voltage (Un) regardless of a polarity of the battery relative to the first and second power supply terminal, primary function means arranged to provide at least one drive signal (Ud) to a drive circuit for driving an electroacoustic conversion means by controlling electrical valve means ( 14, 15, 16, 17 ). The drive circuit is electrically connected to the first power supply terminal and to the second power supply terminal, and the electrical valve means ( 14, 15, 16, 17 ) are polarity-independent, that is, they are able to operate regardless of the polarity of the voltage applied to their terminals. As a result, the current path from the battery to the electroacoustic conversion means and back again comprises at the most two electrical valve means ( 14, 15, 16, 17 ), e.g. transistors, minimizing voltage drop and power loss.
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