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US 9,882,473 B2Granted
Power converter with robust stable feedback
AssigneeSilanna Asia Pte Ltd
InventorBarry S. Arbetter
Life of this patent
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Abstract
Various methods and devices that involve power converter with stable feedback are disclosed. A disclosed power converter comprises an input node on an input side of the power converter and an output node on an output side of the power converter. The power converter also comprises a switch coupled to the input node and having a control node, a feedback path between the output node and the control node, and a first circuit block on the feedback path with a multipath feedback active filter. The first circuit block is at least partly defined by a pure bandpass transfer function.
Claims17
A power converter comprising:
- an input node on an input side of the power converter;
- an output node on an output side of the power converter;
- an inductor connected to the output node;
- a capacitor connected to the output node and a reference node;
- a switch coupled to the input node and having a control node, wherein the switch is connected to the inductor, the switch is a field effect transistor, and the control node is a gate of the field effect transistor;
- a feedback path between the output node and the control node;
- a first circuit block on the feedback path with a multipath feedback active filter;
- a comparator located on the feedback path having a first input and a second input, wherein the comparator sets a duty cycle of a control signal delivered to the control node;
- an error amplifier located on the feedback path;
- and
- a current sensing circuit measuring a current through the inductor and located on the feedback path;
- wherein the first circuit block is at least partly defined by a pure bandpass transfer function;
- and wherein a quality factor of the pure bandpass transfer function is greater than 0.5.
10 more elements
A power converter comprising:
- an input node on an input side of the power converter;
- an output node on an output side of the power converter;
- an inductor connected to the output node;
- a capacitor connected to the output node and a reference node;
- a switch with a control node, wherein the switch is connected to the inductor, the switch is a field effect transistor, and the control node is a gate of the field effect transistor;
- a feedback path between the output node and the control node;
- a pulse width modulator that provides a control signal to the control node;
- a bandpass circuit that:
- (i) is AC coupled to the output side of the power converter;
- (ii) includes a multipath feedback active filter;
- and (iii) produces a compensator signal;
- a sense circuit connected to the output side of the power converter that produces a first measurement signal;
- a comparator located on the feedback path having a first input and a second input, wherein the comparator sets a duty cycle of the control signal;
- an error amplifier located on the feedback path;
- and
- a current sensing circuit measuring a current through the inductor and located on the feedback path;
- wherein the control signal is based on the compensator signal and the first measurement signal;
- and wherein a quality factor of the bandpass circuit is greater than 0.5.
15 more elements
A method for converting power using a power converter comprising:
- transferring power from an input node to an output node using a switch connected to the input node, wherein the switch defines an output side and an input side of the power converter, and wherein the switch has a control node;
- obtaining a measurement signal from one of a voltage and a current on the output side of the power converter;
- filtering the measurement signal using a bandpass filter circuit block to obtain a filtered measurement signal;
- obtaining a voltage measurement signal from a voltage divider on the output side;
- filtering the voltage measurement signal using a low pass circuit block to obtain a filtered voltage measurement signal;
- adding the filtered voltage measurement signal to the filtered measurement signal using an adder circuit block;
- obtaining a second measurement signal on the output side;
- adding the second measurement signal to a periodic signal;
- and
- delivering a control signal based on the filtered measurement signal to the control node using a controller, wherein the control signal is based on both the filtered measurement signal and the filtered voltage measurement signal, and the control signal is also based on both the second measurement signal and the periodic signal;
- wherein the bandpass filter circuit block is AC coupled to the output side;
- wherein the bandpass filter circuit block has a quality factor greater than 0.5;
- wherein the bandpass filter circuit block has a bandpass transfer function with a center frequency;
- and wherein the bandpass transfer function is provided by a multipath feedback active filter with an amplifier.
11 more elements
Dependencies are inferred from the claim text.