Digital pulse width modulation controller with preset filter coefficients
First Claim
1. A voltage regulator comprising:
- at least one power switch adapted to convey power between respective input and output terminals of said voltage regulator; and
a digital controller adapted to control operation of said at least one power switch responsive to an output measurement of said voltage regulator, said digital controller comprising;
an analog-to-digital converter providing a digital error signal representing a difference between said output measurement and a reference value;
a digital filter having a transfer function defined by plural filter coefficients;
a digital pulse width modulator providing a control signal to said at least one power switch, said control signal having a pulse width corresponding to said digital control output; and
a memory containing a plurality of pre-defined coefficient sets, said digital filter being adapted to load a selected one of said pre-defined coefficient sets into said plural filter coefficients.
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Accused Products
Abstract
A switched mode voltage regulator includes a digital control system having a digital filter with a plurality of preset filter coefficients that can be selectively loaded into the digital filter to achieve different operating characteristics. The voltage regulator comprises at least one power switch adapted to convey power between respective input and output terminals of the voltage regulator, and a digital controller adapted to control operation of the at least one power switch responsive to an output measurement of the voltage regulator. The digital controller comprises an analog-to-digital converter providing a digital error signal representing a difference between the output measurement and a reference value, a digital filter having a transfer function defined by plural filter coefficients, a digital pulse width modulator providing a control signal to the at least one power switch, the control signal having a pulse width corresponding to the digital control output, and a memory containing a plurality of pre-defined coefficient sets. The digital filter is adapted to load a selected one of the pre-defined coefficient sets into the plural filter coefficients.
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Citations
16 Claims
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1. A voltage regulator comprising:
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at least one power switch adapted to convey power between respective input and output terminals of said voltage regulator; and
a digital controller adapted to control operation of said at least one power switch responsive to an output measurement of said voltage regulator, said digital controller comprising;
an analog-to-digital converter providing a digital error signal representing a difference between said output measurement and a reference value;
a digital filter having a transfer function defined by plural filter coefficients;
a digital pulse width modulator providing a control signal to said at least one power switch, said control signal having a pulse width corresponding to said digital control output; and
a memory containing a plurality of pre-defined coefficient sets, said digital filter being adapted to load a selected one of said pre-defined coefficient sets into said plural filter coefficients. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling a voltage regulator comprising at least one power switch adapted to convey power between input and output terminals of said voltage regulator, said method comprising:
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receiving an output measurement of said voltage regulator;
sampling said output measurement to provide a digital error signal representing a difference between said output measurement and a reference value;
filtering said digital error signal to provide a digital control output based on a transfer function defined by plural filter coefficients;
providing a control signal to said at least one power switch, said control signal having a pulse width corresponding to said digital control output;
storing a plurality of pre-defined coefficient sets; and
selectively loading a selected one of said pre-defined coefficient sets into said plural filter coefficients. - View Dependent Claims (8, 9, 10)
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11. A voltage regulator comprising:
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at least one power switch adapted to convey power between respective input and output terminals of said voltage regulator; and
a digital controller adapted to control operation of said at least one power switch responsive to an output measurement of said voltage regulator, said digital controller comprising;
an analog-to-digital converter providing a digital error signal representing a difference between said output measurement and a reference value;
a digital filter having a transfer function defined by plural filter coefficients and means for selecting said plural filter coefficients from among a plurality of pre-defined coefficient sets; and
a digital pulse width modulator providing a control signal to said at least one power switch, said control signal having a pulse width corresponding to said digital control output. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification