Application device, motor component and motor driver circuit

Patent metadata

Field	Value
Publication number	US-2016352264-A1
Application number	US-201615231190-A
Country	US
Kind code	A1
Filing date	Aug 8, 2016
Priority date	Aug 8, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

An application device, a motor component and a motor driver circuit are provided according to the invention. The motor driver circuit includes: a controllable bi-direction alternating current switch connected in series with a motor across an external alternating current power source; a switch control circuit configured to control the controllable bi-direction alternating current switch to be turned on or turned off in a preset manner; and a delay circuit configured to delay a turn-on for the controllable bi-direction alternating current switch for a preset time to decrease a phase difference between a current flowing through the motor and a counter electromotive force. The motor driver circuit can improve a power efficiency of the motor.

First claim

1 . A motor driver circuit comprising:
a controllable bi-direction alternating current switch connected in series with a motor across an external alternating current power source; a switch control circuit configured to control the controllable bi-direction alternating current switch to be turned on or turned off in a preset manner; and a delay circuit configured to delay a turn-on for the controllable bi-direction alternating current switch a preset time to decrease a phase difference between a current and a counter electromotive force flowing through the motor.

2 . The motor driver circuit according to claim 1 , wherein the delay circuit comprises a RC delay circuit, wherein a capacitor of the RC delay circuit is connected to a control terminal of the controllable bi-direction alternating current switch.

3 . The motor driver circuit according to claim 1 , further comprising a position sensor configured to detect a magnetic field of a rotor of the motor and then output a magnetic induction signal corresponding to the magnetic field; and wherein the switch control circuit is configured to control the controllable bi-direction alternating current switch to be turned on or turned off based on the magnetic induction signal and a polarity of a power signal outputted from the alternating current power source.

4 . The motor driver circuit according to claim 3 , wherein the switch control circuit is configured to:
turn on the controllable bi-direction alternating current switch, in a case that the polarity of the outputted power signal is positive and the detected magnetic induction signal is in a first polarity, or in a case that the polarity of the outputted power signal is negative and the detected magnetic induction signal is in a second polarity; and turn off the controllable bi-direction alternating current switch, in a case that the power signal is negative and the detected magnetic induction signal is in the first polarity, or in a case that the power signal is positive and the detected magnetic induction signal is in the second polarity.

5 . The motor driver circuit according to claim 3 , further comprising a rectification circuit, wherein the rectification circuit comprises a high voltage output terminal and a low voltage output terminal; and in a case that the controllable bi-direction alternating current switch is turned on, the switch control circuit switches between a first state in which a current flows from the high voltage output terminal of the rectification circuit to a control terminal of the controllable bi-direction alternating current switch and a second state in which a current flows from the control terminal of the controllable bi-direction alternating current switch to the low voltage output terminal of the rectification circuit.

6 . The motor driver circuit according to claim 5 , wherein the switching of operation state of the switch control circuit between the first state and the second state is the case of immediately switching to one state after the other state ends, or the case of switching to one state after an interval time following the other state elapses.

7 . The motor driver circuit according to claim 5 , wherein the switch control circuit comprises a first switch and a second switch; wherein
the first switch is connected in a first current path, the first current path is disposed between the control terminal of the controllable bi-direction alternating current switch and the high voltage output terminal of the rectification circuit; and the second switch is connected in a second current path, the second current path is disposed between the control terminal of the controllable bi-direction alternating current switch and the low voltage output terminal of the rectification circuit.

8 . The motor driver circuit according to claim 7 , wherein the delay circuit comprises a RC delay circuit, and the RC delay circuit comprises a capacitor connected to the control terminal of the controllable bi-direction alternating current switch and a resistor connected between the control terminal of the controllable bi-direction alternating current switch and a current output terminal of the first switch.

9 . The motor driver circuit according to claim 7 , wherein the switch control circuit further comprise a first resistor, NPN triode, a second resistor and a first diode connected in series between the control terminal of the controllable bi-direction alternating current switch and an output terminal of the position sensor, the cathode of the diode is connected to the output terminal of the position sensor, one terminal of the first resistor is connected to the high voltage output terminal of the rectification circuit, and the other terminal of the first resistor is connected to the output terminal of the position sensor; a base of the NPN triode is connected to the output terminal of the position sensor, an emitter of the NPN triode is connected to the anode of the diode; and collector of the NPN triode is connected to the high voltage output terminal of the rectification circuit; and the second resistor is formed as a RC delay circuit with a capacitor connected in series with the second resistor, and connected to the control terminal of the controllable bi-direction alternating current switch.

10 . The motor driver circuit according to claim 3 , wherein the switch control circuit comprises: a first current path in which a current flows to a control terminal of the controllable bi-direction alternating current switch; a second current path in which a current flows from the control terminal of the controllable bi-direction alternating current switch; and a switch connected in one of the first current path and the second current path, the switch is controlled by the magnetic induction signal to make the first current path and the second current path to be turned on selectively.

11 . The motor driver circuit according to claim 10 , wherein the other one of the first current path and the second current path does not comprise a switch.

12 . The motor driver circuit according to claim 3 , wherein the position sensor and the switch control circuit are integrated inside an integrated circuit; and the delay circuit comprises a RC delay circuit, a capacitor of the RC delay circuit is disposed out of the integrated circuit.

13 . The motor driver circuit according to claim 3 , wherein the position sensor, the switch control circuit and the delay circuit are integrated inside an integrated circuit.

14 . The motor driver circuit according to claim 1 , wherein the controllable bi-direction alternating current switch is connected between a first node and a second node, a stator winding of the motor and the alternating current power source are connected in series between the first node and the second node; or the stator winding of the motor and the controllable bi-direction alternating current switch are connected in series between the first node and the second node, and the first node and the second node are respectively connected to two terminals of the alternating current power source.

15 . The motor driver circuit according to claim 1 , wherein the delay circuit comprises an even number of NOT gates.

16 . A motor component comprising a motor and the motor driver circuit according to claim 1 .

17 . The motor component according to claim 16 , wherein the motor comprises a stator and a rotor, wherein the stator comprises a stator core and a single phase winding wound around the stator core.

18 . The motor component according to claim 16 , wherein the m

Assignees

• Johnson Electric Sa

Inventors

• Sun Chi Ping
• Yeung Shing Hin
• Yang Xiu Wen
• Xin Fei
• Huang Shu Juan
• Jiang Yun Long
• Li Yue
• Liu Bao Ting
• Wang En Hui
• Liu li sheng
• Cui yan yun

Classifications

• H02K21/14

  with magnets rotating within the armatures · CPC title

• H02P6/26

  Arrangements for controlling single phase motors · CPC title

• H02K1/2706

  Inner rotors · CPC title

• H02P6/16 Primary

  Circuit arrangements for detecting position · CPC title

• H02K11/215

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title