| 摘要 |
A circuit arrangement for regulating the output voltage of a power supply apparatus has a first circuit part (V7, V8, V9, C1) which detects a deviation of the output voltage from a desired value and emits a regulation signal. Furthermore, a second circuit part is provided which responds to an unacceptable voltage change and forms a protection device. A voltage value which occurs on the first circuit part and is characteristically increased and/or reduced in comparison with the regulation signal produced in normal operation is used for driving the second circuit part (V1, V2, V3, V4). The described circuit arrangement is suitable for power supply apparatuses in which stringent requirements are placed on the constancy of the output voltage and in which a deviation of the output voltage from the desired value is intended to lead to disconnection. An advantageous use is especially in intrinsically-safe power supply apparatuses, as are used underground in mining (Figure 2). <IMAGE>
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