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More than Circuit EngineeringThyristor with the galvanic isolation from the control circuit
Ñõåìû >> Circuit engineering >> Thyristor with the galvanic isolation from the control circuitThyristor with the galvanic isolation from the control circuit
To control powerful thyristors by low-powered electronic circuits is enough problematic sometimes. The use of amplifier or relay is required for this purpose.
Switching on the PCP (photon-coupled pair) light-emitting diode – phototransistor enables to decide this problem.
,
where 
– basic value of current on a control electrode, here 
,
and 
,
where 
- maximally possible current of transistor. The PCP light-emitting diode – a phototransistor can be substituted by a light-emitting diode – photodiode. Such connection of components enables to control powerful thyristor through constant current.
Thyristor with the galvanic isolation from the control circuit.
added 27.07.08 20:42:10 | 
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