Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-09-04
1992-01-07
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307228, 307263, 307260, 328185, 328181, H03K 408, H03K 484
Patent
active
050794531
ABSTRACT:
A control circuit having slope compensation includes a current reference circuit for providing a reference current at an output. A resistor is coupled to the current reference circuit for varying the reference current. A current mirror circuit has a plurality of outputs, and an input which is coupled to the output of current reference circuit for receiving the reference current. A capacitor is coupled between a first one of the plurality of outputs of the current mirror circuit and a first supply voltage terminal. A charging/discharging circuit is coupled to the capacitor and to a second one of the plurality of outputs of the current mirror circuit for charging the capacitor to a first predetermined voltage at a first rate and discharging the capacitor to a second predetermined voltage at a second rate wherein the signal appearing across the capacitor is a ramp voltage signal. A level shift circuit is coupled to the first one of the plurality of outputs of the current mirror circuit for voltage shifting the ramp voltage signal across the capacitor by a predetermined amount. A multiplier circuit is coupled to the level shift circuit and responsive to the reference current supplied from a third one of the plurality of the outputs of the current mirror circuit for providing a ramp current signal at an output, the peak voltage of the ramp current signal being a function of the value of the resistor wherein the ramp current signal at the output of the multiplier circuit can be utilized to provide slope compensation to a signal supplied at an input of the control circuit.
REFERENCES:
patent: 4047052 (1977-09-01), Koubek et al.
patent: 4705961 (1987-11-01), Ainsworth et al.
patent: 4803381 (1989-02-01), Gornati et al.
patent: 5008562 (1991-04-01), Hosoda et al.
Alberkrack Jade H.
Tisinger Eric W.
Bingham Michael D.
Botsch Bradley J.
Callahan Timothy P.
Motorola Inc.
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