Overcurrent protection circuit of power device and semiconductor

Details Overcurrent protection circuit of power device and semiconductor Overcurrent protection circuit of power device and semiconductor

1993-09-14

1994-12-20

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 93, 323285, H02H 300, H02H 902

Patent

active

053750292

ABSTRACT:
In an overcurrent protection circuit of a power device, an analog switch (4) connects a negative input of a comparator (3) to a reference voltage VREF1 or another reference voltage VREF2 depending on a control signal (S5) from a timer (5). A positive input of the comparator (3) receives voltage drop value (VS). The timer (5) is triggered by a leading edge of an input signal (IN) to output the control signal (S5) to the analog switch (4). The control signal (S5) directs the analog switch (4) to connect the reference voltage VREF2 to the negative input of the comparator (3) only during a transient state estimated period (T) and to connect the reference voltage VREF1 to the negative input of the comparator (3) out of the transient state estimated period (T).

REFERENCES:
patent: 4736267 (1988-04-01), Karlmann et al.
patent: 4896245 (1990-01-01), Qualich
patent: 5111123 (1992-05-01), Hach et al.

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