Precision noise spike elimination circuit for pulse width modula

Details Precision noise spike elimination circuit for pulse width modula Precision noise spike elimination circuit for pulse width modula

1989-01-31

1989-12-12

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

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

323273, 323286, 361111, G05F 1565

Patent

active

048870218

ABSTRACT:
Circuitry is provided to eliminate high frequency noise spikes in the output of a pulse width modulator and inverters employing pulse width modulators. This circuitry provides a precision noise spike elimination circuit based on a discovery that the switching of a MOSFET has two distinct regions: one in which only the drain current changes, and the other in which only the drain to source voltage changes. The precision noise spike elimination circuit includes a pair of back-to-back Zener diodes connected in parallel with the first current generator and direct feedback of the rate of change of voltage across the catch diode, thereby eliminating the effect of non-linear capacitance of the MOSFET in the feedback path. The back-to-back Zener diodes provide very precise control of the rate of change of the MOSFET current and catch-diode voltage. The more linear switching of the MOSFET due to the improved feedback results in a reduction in losses in the MOSFET for the same degree of noise reduction.

REFERENCES:
patent: 3265956 (1966-08-01), Schlabach
patent: 3305767 (1967-02-01), Beihl et al.
patent: 3675158 (1972-07-01), Judd et al.
patent: 4521726 (1985-06-01), Budnik
patent: 4607210 (1986-08-01), Ohms et al.
patent: 4634903 (1987-01-01), Montorfano

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