Bridge arm with transistors and recovery diodes

Details Bridge arm with transistors and recovery diodes Bridge arm with transistors and recovery diodes

1988-01-25

1989-03-28

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 98, 363132, 323289, H02H 7122

Patent

active

048169846

ABSTRACT:
Inverter circuits are provided with bridge arms which, for example, including series-connected transistors (T1l , T2l ) with one freewheeling diode (D1, D2) each transistor. A critical operating state occurs when the recovery current is switched off by one of the diodes (D1, D2), so that the other transistor (T1l , T2l ) is cut in. The return current, which passes through this diode, can assume such high values, when rapidly cutting in the transistor, that the "dynamic" blocking capability of the diode is exceeded, and the diode is burnt out. The load current and the control current are thus reversed, so that the transistor is switched on more slowly and temporarily takes over part of the voltage which is normally applied to the diode.

REFERENCES:
patent: 3909695 (1975-09-01), Pzck
patent: 4410935 (1983-10-01), Dang
patent: 4447741 (1984-05-01), Moschopoulos
patent: 4520255 (1985-05-01), Bredenkamp et al.
patent: 4639823 (1987-01-01), Kuroki
patent: 4716513 (1987-12-01), ITO
Elektric, vol. 36, No. 7, 1982, by Fischer et al., pp. 366-370.
Electronic Design, vol. 29, No. 18, 1981, pp. 13 and 14.
Revue Generale De L'Electricite, No. 9, 1981, by Goeldel et al. pp. 648 to 655.
Elektronik, vol. 24, 1980, by B. Smith, pp. 91 to 94.

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