Back to results
US 8,427,127 B2Granted
Control loop for switching power converters
AssigneeAivaka, Inc.
InventorAhmad B. Dowlatabadi
Life of this patent
Estimating the term…
Abstract
A control loop for a clocked switching power converter where the loop features a comparator (44) and a filter (61) in series to linearize the nonlinear response of the comparator (44). The filter (61) has poles and zeros offsetting the poles and zeros of a bridge rectifier (M1 and M2).
Claims6
A voltage regulator for use with switching power converters comprising
- a non-linear detection circuit having a reference voltage connected to a first input, and a signal representative of an output voltage connected to a second input, and outputting a first logic signal if the first input is greater than the second input, and a second logic signal if the second input is greater than the first input,
- a charge pump responsive to the output of the detection circuit,
- a filter connected to an output of the charge pump for linearizing the non-linear response of the detection circuit, and adapted to provide an output signal to a controller comprising at least one of a PWM or a PFM controller to cause the voltage applied to a load to be substantially constant, and
- wherein the first input to the detection circuit is adapted to be connected to the load through only an impedance.
1 more element
A voltage regulator for use with switching power converters comprising
- a non-linear detection circuit comprising a voltage comparator having a reference voltage connected to a first input, and a signal representative of an output voltage connected to a second input, and outputting a first logic signal if the first input is greater than the second input, and a second logic signal if the second input is greater than the first input,
- a conversion circuit comprising a charge pump for continuously converting the output of the detection circuit to charge, and
- a filter connected to an output of the conversion circuit for linearizing an output of the conversion circuit and adapted to provide a smoothed signal to a driver circuit.
A method for reducing ripple in a DC-to-DC conversion circuit comprising the steps of
- outputting as an output signal a first logic signal if a reference signal is greater than an output voltage,
- outputting as an output signal a second signal if the reference signal is less than the output voltage,
- continuously converting the output signal to charge as a charge output,
- filtering the charge output to linearize the output signal to cause the output voltage applied to a load to be substantially constant, and
- providing the linearized output to a controller and drivers for application to the load.
2 more elements
Dependencies are inferred from the claim text.