Over stress sense circuit for flyback power supply

Details Over stress sense circuit for flyback power supply Over stress sense circuit for flyback power supply

1980-06-27

1982-03-02

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 21, 363 97, 323272, 361 18, H02H 7122

Patent

active

043181686

ABSTRACT:
An overload protective circuit for direct current switching or flyback power supplies which senses for build up of internal transistor stress during operation of the main power transistor output stage. Normally, setting an internal overload limit for the main power transistor dissipation is difficult to achieve because the load current to be sensed is out of phase with input driver current. The invention provides for sensing a change in base drive input voltage during a departure from normal operating saturation of Baker clamped main power transistors and initiating a reduction in the width of the drive pulses to reduce internal transistor stress and to reduce power input prior to transistor damage.

REFERENCES:
patent: 3859586 (1975-01-01), Wadlington
patent: 3873903 (1975-03-01), Koetsch et al.
patent: 4031453 (1977-06-01), Tevling
patent: 4063307 (1977-12-01), Stephens
patent: 4150425 (1979-04-01), Nagano et al.

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