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Disclosed is a sensing technique that will provide an interrupt signal when a switching regulator power supply has consistently exceeded a load current threshold for a preset period of time.
English (United States)
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Over-Current Detection for Switching Regulator Power Supplies
Disclosed is a sensing technique that will provide an interrupt signal when a
switching regulator power supply has consistently exceeded a load current
threshold for a preset period of time.
The output voltage of a switching regulator power supply is adjusted by a
control waveform flowing from the regulator section to the output filter section of
the power supply. The control waveform is a constant frequency variable duty
cycle current pulse waveform. The current pulse amplitude of this waveform is
directly proportional to the load current being delivered by the power supply.
Because of the proportionality between the amplitude of the control waveform
and the load current flowing from the power supply, a threshold can be defined
for the control waveform amplitude that represents an output over-current
In normal operation, a power supply can have an over-current condition for a
short period of time (several cycles of the control waveform). If the over-current
condition exists for longer than a predetermined number of cycles, the power
supply is delivering too much current to the load and an interrupt signal is
required. The interrupt signal is generated when a summation of the control
waveform cycles that are above the over-current threshold is larger preset value.
The summation is slowly reduced (not less than zero) when no over-current
pulses are present in the control waveform.