# US 2026/0100650 A1 · Transient control scheme for multiphase power converters

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- Number: US 2026/0100650 A1
- Document ID: US20260100650A1
- Status: Published application
- Kind: A1
- Application number: 19/417,526
- Filed: 2025-12-12
- Published: 2026-04-09
- Earliest claimed: 2022-12-19
- Applicants: Virginia Tech Intellectual Properties, Inc.
- Inventors: Adhistira Madhyasta Naradhipa; Qiang Li
- Web page: https://patentgrep.com/patent/US20260100650A1

## CPC

- H02M 3/1584: {with a plurality of power processing stages connected in parallel}
- H02M 3/1566: {with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation}
- H02M 3/1586: {switched with a phase shift, i.e. interleaved}
- H02M 1/0043: {Converters switched with a phase shift, i.e. interleaved (non-isolated DC/DC converters H02M3/1586)}
- H02M 1/0095: {Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck}
- H02M 1/14: Arrangements for reducing ripples from DC input or output
- H02M 3/07: using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

An example power converter system includes a multiphase power converter including a plurality of phases and a controller configured to control a steady state operation and a transient state operation of the multiphase power converter. In the steady state operation, the controller is configured to sequentially turn on each of the plurality of phases without phase overlap. In the transient state operation, the controller is configured to turn on at least two non-subsequent phases of the plurality of phases with phase overlap when a load current increase is detected for the multiphase power converter.

## Claims

### Claim 1

A power converter system, comprising:
a multiphase power converter comprising a plurality of phases; and
a controller configured to control a steady state operation and a transient state operation of the multiphase power converter, wherein:
in the steady state operation, the controller is configured to sequentially turn on each of the plurality of phases without phase overlap; and
in the transient state operation, the controller is configured to turn on at least two non-subsequent phases of the plurality of phases with phase overlap when a load current increase is detected for the multiphase power converter.

### Claim 2 (depends on 1)

The power converter system of claim 1, wherein the controller comprises a clock generator and a phase manager, the clock generator being configured to generate one or more clock signals and the phase manager being configured to distribute the one or more clock signals for controlling switching operations of one or more of the plurality of phases for the steady state operation and/or the transient state operation.

### Claim 3 (depends on 1)

The power converter system of claim 1, wherein the controller is configured to control the transient state operation of the multiphase power converter based on a constant on-time (COT) control method.

### Claim 4 (depends on 1)

The power converter system of claim 1, wherein in the transient state operation, the controller is further configured to prevent phase overlap of subsequent phases of the plurality of phases.

### Claim 5 (depends on 1)

The power converter system of claim 1, further comprising a current sensing circuit connected between the controller and the multiphase power converter, the current sensing circuit configured to detect a sensed total inductor current from the multiphase power converter, and the controller configured to use the sensed total inductor current for controlling the steady state operation and the transient state operation of the multiphase power converter.

### Claim 6 (depends on 5)

The power converter system of claim 5, wherein:
the plurality of phases comprise a first phase, a second phase, a third phase, and a fourth phase; and
the controller is configured to turn on the first phase and the third phase with phase overlap in the transient state operation.

### Claim 7 (depends on 6)

The power converter system of claim 6, wherein the controller is configured to turn on the second phase and the fourth phase with phase overlap in the transient state operation.

### Claim 8 (depends on 6)

The power converter system of claim 6, wherein the controller is configured to turn on the first phase and the fourth phase with phase overlap in the transient state operation.

### Claim 9 (depends on 6)

The power converter system of claim 6, wherein the first phase and the third phase are turned on at different times.

### Claim 10 (depends on 1)

The power converter system of claim 1, wherein the multiphase power converter comprises a multiphase series capacitor buck power converter.

### Claim 11

A power converter system, comprising:
a multiphase power converter comprising a plurality of phases; and
a controller configured to control a steady state operation and a transient state operation of the multiphase power converter, wherein:
in the steady state operation, the controller is configured to sequentially turn on each of the plurality of phases without phase overlap;
in the transient state operation, the controller is configured to turn on at least two non-subsequent phases of the plurality of phases with phase overlap and prevent phase overlap of subsequent phases; and
in the transient state operation, the controller is configured to turn on the at least two non-subsequent phases at different times.

### Claim 12 (depends on 11)

The power converter system of claim 11, wherein the controller comprises a clock generator and a phase manager, the clock generator being configured to generate one or more clock signals and the phase manager being configured to distribute the one or more clock signals for controlling switching operations of one or more of the plurality of phases for the steady state operation and/or the transient state operation.

### Claim 13 (depends on 12)

The power converter system of claim 12, wherein:
the controller further comprises a comparator configured to receive a sensed total inductor current of the plurality of phases and a compensator voltage from a compensator coupled to a load; and
the comparator is configured to compare the compensator voltage and the sensed total inductor current to generate a comparator clock signal input for the clock generator.

### Claim 14 (depends on 11)

The power converter system of claim 11, wherein:
the plurality of phases comprise a first phase, a second phase, and a third phase; and
the controller is configured to turn on the first phase and the third phase with phase overlap in the transient state operation.

### Claim 15 (depends on 14)

The power converter system of claim 14, wherein the first phase and the third phase are turned on at different times.

### Claim 16 (depends on 11)

The power converter system of claim 11, wherein:
the plurality of phases comprise a first phase, a second phase, a third phase, and a fourth phase;
the controller is configured to turn on the first phase and the third phase with phase overlap in the transient state operation; and
the controller is configured to turn on the second phase and the fourth phase with phase overlap in the transient state operation.

### Claim 17 (depends on 16)

The power converter system of claim 16, wherein the controller is configured to turn on the first phase and the fourth phase with phase overlap in the transient state operation.

### Claim 18 (depends on 16)

The power converter system of claim 16, wherein the first phase, the second phase, the third phase, and the fourth phase are turned on at different times in association with the transient state operation.

### Claim 19 (depends on 11)

The power converter system of claim 11, wherein the multiphase power converter comprises a multiphase series capacitor buck power converter.

### Claim 20 (depends on 11)

The power converter system of claim 11, wherein the controller is configured to control the transient state operation of the multiphase power converter based on a constant on-time (COT) control method.