Dual threshold current mode digital PWM controller

Details Dual threshold current mode digital PWM controller Dual threshold current mode digital PWM controller

1995-05-08

1997-05-13

Sterrett, Jeffrey L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323284, 323285, G05F 1563

Patent

active

056296100

ABSTRACT:
A fully digital, current mode, PWM control is realized by employing two distinct comparators, both reading the voltage drop on a sensing resistance. The first comparator exerts an open-loop current mode control. The second comparator, establishing a second higher current threshold than the current threshold set by the first comparator, triggers a disabling circuit of the output power transistor for a preset period of time, when the current level through the output stage uncontrollably rises beyond the second threshold. This may occur because of an insufficient discharge from the load circuit inductance during off-phases of the output power transistor of the extra energy stored during switching delay periods of the first (open loop control) comparator. The frequency of the sequence of bursts may be precisely controlled to be well outside the frequency range of interest to prevent disturbances.

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