Fishing – trapping – and vermin destroying
Patent
1987-03-30
1988-12-20
Hearn, Brian E.
Fishing, trapping, and vermin destroying
437 16, 437 17, 437 38, 437902, H01L 2126, H01L 2974
Patent
active
047925302
ABSTRACT:
A thyristor having a beveled edge extending from its top surface is irradiated by an electron beam which is applied only to the beveled surface and is also electron beam irradiated from its bottom surface through an expansion plate fixed to the bottom surface. The radiation dose applied to the beveled surface is from five to thirty times that applied to the full bottom surface. The electron beam irradiation of the bevel substantially reduces the lifetime of the material in the bevel area to enable balancing of forward and reverse leakage current characteristics and balancing of the forward and reverse voltage blocking characteristics of the device.
REFERENCES:
patent: 3809582 (1974-05-01), Tarneja et al.
patent: 3840887 (1974-10-01), Roberts et al.
patent: 3881964 (1975-05-01), Cresswell et al.
Fasce et al., "Effects of Electron Irradiation on High Power GTOB", Second International Conf. on Power Electronics and Variable Speed Drives, Nov. 1986, pp. 10-14.
Baliga et al., "Optimisation of Recombination Levels and Their Capture Cross Section in Power Rectifiers and Thyristors", Solid-State Electronics, vol. 20, Mar. 77, pp. 225-232.
Hearn Brian E.
International Rectifier Corporation
Thomas Tom
LandOfFree
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