| 摘要 |
PURPOSE:To attain ease of circuit integration with simple circuit constitution by providing a semiconductor control rectifier element having a main terminal connected to one end of a load, other main terminal connected to a reference potential and a control terminal, a switching element whose main terminal is connected to a control terminal and to other terminal of a load and a p-n junction element connected between the other terminal of load and a reference potential. CONSTITUTION:When the energy of a solenoid 1 is circulated, a potential at other point P of the solenoid is lowered to a reference potential by a forward drop's share of a diode 4. Then a switching element 7 is inserted between a gate G of the thyristor 5 and other end P of solenoid and it is possible to draw a current from the gate of the thyristor 5. An on-voltage of the switching element 7 given externally is permitted to a value being a sum between the on-voltage between the gate G and the cathode K of the thyristor 5 and the on-voltage of a circulating diode 4, then high on-voltage (e.g., thyristor) element as the 1st switching element 7 is applied. |
