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Overload protection circuit for transistor switch - has extra transistor preventing voltage spikes from protective thyristor from adversely affecting switch
Overload protection circuit for transistor switch - has extra transistor preventing voltage spikes from protective thyristor from adversely affecting switch
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机译：晶体管开关的过载保护电路-具有额外的晶体管，可防止保护晶闸管产生的电压尖峰对开关产生不利影响
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摘要
The overload protection circuit, for a transistor switch, employs a thyristor to protect the switch. The transistor is unaffected by unwanted voltage spikes originating from the thyristor. An auxiliary transistor (T2) is connected in series with the protection thyristor (Th) and conducts only when the thyristor is conducting. The thyristor is shunted by a capacitor (C2) which may be in series with a protective resistor (R4). The auxiliary transistor's base may be connected to its own potential source (U') at the same time as the switching transistor's base is connected to its own source, i.e. ground. The circuit may be used in telephone exchanges where signals currents from low impedance current sources are connected to lines via transistor switches.
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