Overvoltage protection circuit
Electrical power supply apparatuses are known which act (by means of an optocoupler) on a control circuit fitted on the primary side, when an overvoltage occurs on the secondary side. In this case, it can be advantageous, when the overvoltage protection circuit has operated, to allow it to continue...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | Electrical power supply apparatuses are known which act (by means of an optocoupler) on a control circuit fitted on the primary side, when an overvoltage occurs on the secondary side. In this case, it can be advantageous, when the overvoltage protection circuit has operated, to allow it to continue to act even after the overvoltage has decayed. This monostable response behaviour is intended to be achieved with an outlay for switching elements which is as low as possible. To this end, the monostable stage is formed from a phototransistor of the optocoupler and a switching transistor, the base connection of the phototransistor being connected to the switching transistor via a coupling resistor. Electrical power supply apparatuses. |
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