Switch mode power supply with BJT/MOSFET cascode circuit

Details Switch mode power supply with BJT/MOSFET cascode circuit Switch mode power supply with BJT/MOSFET cascode circuit

1994-08-03

1995-05-23

Pellinen, A. D.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363131, H02M 3335

Patent

active

054187028

ABSTRACT:
Switched-mode power supplies in which a series arrangement of a bipolar transistor and a MOS field effect transistor is used are known and referred to as cascode circuits. In these circuits the bipolar transistor is switched (with the MOS field effect transistor) via the emitter instead of with the base. Since the collector current of the bipolar transistor may vary over a large range, the base should be proportionally driven to prevent the bipolar transistor from getting either above or below its normal operating range. By making use of an extra winding on a transformer arranged in series with the cascode circuit, a non-dissipative proportional drive of the base of the bipolar transistor is obtained. The extra winding is coupled to the base via an inductance.

REFERENCES:
patent: 3896367 (1975-07-01), Frantz
patent: 3925717 (1975-12-01), Kinnard
patent: 4709321 (1987-11-01), Trantham
V. Farrow and B. Taylor, "A 300 KHZ Off-line Switching Supply Using a Unique B-MOS Switch Combination", Powerconversion International, Sep./Oct., 1980. Pp. 20-27.
F. Michael Barlage, "A New Switched-mode Converter Technique Combines VMOS and Bipolar", Proceedings of Powerconversion Conference, San Francisco (4-6 May, 1978), pp. D2-1-8.
S. Clemente et al, "High Voltage, High Frequency Switching Using a Cascode Connection of Bipolar transistor and Power MOSFET", IEEE Industrial Applications, Soc. 1982, pp. 1395-1405.

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