US 2008/0278104 A1 · CONTROL CIRCUIT OF SENSORLESS MOTOR AND CONTROL METHOD THEREOF

Abstract

A control circuit of a sensorless motor includes a first coil, a second coil, a first switch circuit, a second switch circuit and an auxiliary switch circuit. The first switch circuit is electrically connected to the first coil and controls a direction of a current flowing through the first coil. The second switch circuit is electrically connected to the second coil and controls a direction of a current flowing through the second coil. The auxiliary switch circuit is electrically connected to and between the first coil and the second coil and controls the directions of the currents flowing through the first coil and the second coil by cooperating with the first switch circuit and the second switch circuit. A control method of a sensorless motor is also disclosed.

Claims20

Dependent claims

A control circuit of a sensorless motor, comprising:

a first coil;
a second coil;
a first switch circuit electrically connected to the first coil for controlling a direction of a current flowing through the first coil;
a second switch circuit electrically connected to the second coil for controlling a direction of a current flowing through the second coil;
and
an auxiliary switch circuit electrically connected to and between the first coil and the second coil for controlling the directions of the currents flowing through the first coil and the second coil by cooperating with the first switch circuit and the second switch circuit.

3 more elements

A control method for a control circuit of a sensorless motor, wherein the control circuit comprises a first coil, a second coil, a first switch circuit, a second switch Circuit, and an auxiliary switch circuit, wherein the control method comprises steps of:

alternately turning on the first switch circuit, the second switch circuit and the auxiliary switch circuit to make the control circuit form a half-bridge driving mode and to make a current flow through the first coil or the second coil to start the motor;
alternately turning on the first switch circuit, the second switch circuit and the auxiliary switch circuit to make the control circuit form a full-bridge driving mode and to make the current flow through both the first coil and the second coil;
applying the current through the first coil or the second coil when the control circuit is in the full-bridge driving mode;
and
repeating the step of making the control circuit in the full-bridge driving mode so as to keep the motor operating.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/028,654Filed 8 Feb 2008

Priority

TW 09611676811 May 2007

Published

13 Nov 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02P 6/20
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position;…:…
H02P 6/085
Arrangements for controlling the speed or torque of a single motor: in a bridge configuration
H02P 6/182
Without separate position detecting elements: using back-emf in windings
H02P 6/26
Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position;…:…

Control circuit of sensorless motor and control method thereof

Life of this patent

Control circuit of sensorless motor and control method thereof

Life of this patent

Abstract

Claims20