Method and apparatus for reducing low-frequency current ripple on a direct current supply line
OwnerEliahu Ashkenazyinventor
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Abstract
A method and apparatus for reducing low-frequency current ripple on a direct current (DC) supply line is disclosed in its basic embodiment, and in an enhanced performance form. By replacing the large inductance in the series-inductance, shunt-capacitance filter model that is commonly used in this application with a solid-state, constant-current device, an efficient, low-loss apparatus capable of outperforming traditional methods in this role is realized especially in military communications applications where MIL-STD-461E requirements must be met in a compact form.
Claims5
A method for reducing current ripple on a direct current (DC) supply line the method comprising:
- a. sampling the supply line current at the input;
- b. detecting current ripple present in the sample of the supply line current;
- c. converting the detected current ripple into a related gating voltage;
- d. applying the gating voltage to a solid-state constant-current device that is in series with the supply line input;
- and
- e. smoothing the output of the constant-current device with shunt capacitance at the output.
An apparatus for reducing current ripple on a DC supply line, comprising:
- a. an input and an output, these being interconnected serially by a solid-state constant-current device having a gating voltage input;
- b. a means to sample and detect the current ripple present at the apparatus input, this means having an output;
- c. a circuit having an input and output, its input being connected to the output of the means to sample and detect the current ripple, the circuit deriving a gating voltage at its output that is related to the detected current ripple, the output gating voltage being connected to the constant-current device at its gating voltage input;
- and
- d. a shunt capacitance connected to the output of the apparatus.
Dependencies are inferred from the claim text.