Active power supply ripple filter

Details Active power supply ripple filter Active power supply ripple filter

1980-08-15

1982-04-27

Shoop, William M.

Electricity: power supply or regulation systems

Input level responsive

Using a linearly acting final control device

323275, G05F 500

Patent

active

043273190

ABSTRACT:
An active power supply ripple filter with low noise and low power dissipation characteristics, which tracks the voltage of the power source with low voltage drop and high current capability. The circuit consists of a control transistor connected between one terminal of a power source and one terminal of a load, a reference circuit which tracks the supply voltage, a low pass filter which filters the reference voltage and an amplifier for driving the control transistor in response to the filtered reference voltage and a feedback voltage from the load. The circuit minimizes the voltage drop across the control transistor as well as minimizing the capacitance values required for the filter capacitors.

REFERENCES:
patent: 2995697 (1961-08-01), Grenier
patent: 3215928 (1965-11-01), Aiken
patent: 3868562 (1975-02-01), Marshall
patent: 3886438 (1975-05-01), Bouman
patent: 3939399 (1976-02-01), Funatsu et al.
patent: 4017779 (1977-04-01), McDonald et al.
patent: 4048523 (1977-09-01), Curcio
patent: 4064448 (1977-12-01), Eatock
patent: 4099155 (1978-07-01), Watanabe
patent: 4103220 (1978-07-01), Huntley
patent: 4114085 (1978-09-01), Leinonen et al.
patent: 4183082 (1980-01-01), Ishii

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