# US 2014/0191698 A1 · Method for actuating a polyphase machine

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- Number: US 2014/0191698 A1
- Document ID: US20140191698A1
- Status: Published application
- Kind: A1
- Application number: 14/123,341
- Filed: 2012-05-11
- Published: 2014-07-10
- Earliest claimed: 2011-05-30
- Assignees: Robert Bosch GmbH
- Inventors: Fabio Magini; Paul Mehringer
- Web page: https://patentgrep.com/patent/US20140191698A1

## CPC

- H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence)
- H02M 7/5395: by pulse-width modulation
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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

A method is described for activating a multiphase machine that has a link circuit equipped with a link circuit capacitor, phase windings, and one high-side switch and one low-side switch per phase. The switches associated with the individual phases have control signals applied to them by a control unit. The control unit provides, in successive activation cycles, pulse-shaped control signals for the switches, the pulse widths and pulse onsets of which are respectively varied within an activation cycle in such a way that the link circuit current is reduced.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

A method for activating a multiphase machine that includes a link circuit equipped with a link circuit capacitor, phase windings, and one high-side switch and one low-side switch per phase, comprising:
providing, by a control unit, in successive activation cycles, pulse-shaped control signals for the switches; and
respectively varying pulse widths and pulse onsets of the control signals within an activation cycle in such a way that a link circuit current is reduced.

### Claim 10 (depends on 9)

The method as recited in claim 9, wherein the control unit activates the switches associated with individual phases using a flat-top method, and shifts the control signals for the switches relative to one another in successive flat-top windows.

### Claim 11 (depends on 9)

The method as recited in claim 9, wherein the control unit shifts the control signals for the switches with respect to one another in such a way that overlaps of positive or negative phase currents in the link circuit are reduced.

### Claim 12 (depends on 9)

The method as recited in claim 9, wherein the control unit shifts the control signals for the switches with respect to one another in such a way that positive and negative phase currents in the link circuit at least partly compensate for one another.

### Claim 13 (depends on 10)

The method as recited in claim 10, wherein:
a number of the flat-top windows corresponds to twice a number of phases of the machine,
successive flat-top windows respectively alternate between a high-side and a low-side, and
a respective flat-top window is located in a region of a positive or negative maximum value of a respectively pertinent voltage definition.

### Claim 14 (depends on 10)

The method as recited in claim 10, wherein:
a number of the flat-top windows corresponds to a number of the phases of the machine,
the flat-top windows refer only to a high-side or a low-side; and
a respective flat-top window is located in a region of a positive or negative maximum value of a respectively pertinent voltage definition.

### Claim 15 (depends on 13)

The method as recited in claim 13, wherein the control unit causes the high-side and low-side switches associated with individual current phases to be successively made conductive, a high-side switch associated with a current phase being made conductive when a pertinent target voltage value is greater than an upper limit value, and a low-side switch associated with a current phase being made conductive when the pertinent target voltage value is less than a lower limit value.

### Claim 16 (depends on 10)

The method as recited in claim 10, wherein the reduction in the link circuit current is performed by shifting in time the control signals of the phases that are associated with a phase not presently conductive.