Linear motor driving method and circuit and related apparatus

Patent metadata

Field	Value
Publication number	US-12308772-B2
Application number	US-202218044118-A
Country	US
Kind code	B2
Filing date	Aug 30, 2022
Priority date	Nov 5, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A linear motor driving method and circuit and a related apparatus are provided. The method is applied to a linear motor driving circuit. According to the method, the power supply module can supply power to the driver module and the control module, so that the control module can control the driver module to start and drive the linear motor to operate, so as to allow an electronic device to produce a vibration effect; and then the control module can control the driver module to turn off and stop driving the linear motor. However, the linear motor will continue to make damped vibration due to inertia. Specifically, a coil of the linear motor generates an induced electromotive force during vibration. Therefore, after the driver module is turned off, the control module will also control the energy recovery module to recover electric energy generated by the damped vibration of the linear motor.

First claim

What is claimed is:

1. A linear motor driving circuit, comprising a control circuit, a driver circuit, a linear motor, and an energy recovery circuit;
wherein the linear motor is configured to:
when the control circuit controls the driver circuit to stop driving the linear motor to vibrate, start damped vibration; and

wherein the control circuit is configured to:
control the driver circuit to stop driving the linear motor; and
control the energy recovery circuit to collect electric energy generated by the linear motor during the damped vibration;

wherein the energy recovery circuit comprises a rectifier circuit and an energy storage circuit;
wherein the rectifier circuit comprises a plurality of operational amplifiers and a plurality of feedback resistors, and is configured to convert a first voltage generated by the linear motor during the damped vibration into a second voltage, the first voltage is a voltage with alternating positive and negative polarities and a variable amplitude, and the second voltage is a unidirectional pulsating direct current voltage with a constant polarity and a variable amplitude; and
wherein the energy storage circuit is configured to store the collected electric energy generated by the linear motor during the damped vibration.

2. The linear motor driving circuit according to claim 1 , wherein the energy recovery circuit is further configured to:
after the energy recovery circuit collects the electric energy generated by the linear motor during the damped vibration, supply the collected electric energy to a first circuit, wherein the first circuit comprises the control circuit or a low-power chip.

3. The linear motor driving circuit according to claim 1 , wherein the control circuit is further configured to:
before the control circuit controls the driver circuit to stop driving the linear motor to vibrate, control the driver circuit to drive the linear motor to vibrate.

4. The linear motor driving circuit according to claim 1 , wherein:
the energy recovery circuit further comprises a filter circuit, the filter circuit is configured to convert the second voltage output by the rectifier circuit into a third voltage, a polarity of the third voltage is the same as that of the second voltage, and an amplitude variation coefficient of the third voltage is lower than that of the second voltage; or
the energy recovery circuit further comprises a boost circuit, the boost circuit is configured to convert the second voltage into a fourth voltage, and a polarity of the fourth voltage is the same as that of the second voltage, and an amplitude of the fourth voltage is greater than that of the second voltage; or
the energy recovery circuit further comprises a filter circuit and a boost circuit, the filter circuit is configured to convert the second voltage output by the rectifier circuit into a third voltage, and wherein:
the boost circuit is configured to convert the third voltage into a fifth voltage, a polarity of the fifth voltage is the same as that of the third voltage, an amplitude of the fifth voltage is greater than that of the third voltage; or
the boost circuit is configured to convert the second voltage into a fourth voltage, and the filter circuit is configured to convert the fourth voltage into a sixth voltage, a polarity of the sixth voltage is the same as that of the fourth voltage, and an amplitude variation coefficient of the sixth voltage is lower than that of the fourth voltage.

5. The linear motor driving circuit according to claim 4 , wherein:
the rectifier circuit is any one of the following: a full-wave rectifier or a half-wave rectifier;
the energy storage circuit is a capacitor, an inductor, a battery, or a circuit comprising a capacitor and an inductor that are connected in series or in parallel;
the filter circuit is any one of the following: a capacitor filter circuit, an inductor filter circuit, a Pi-type RC filter circuit, a Pi-type LC filter circuit, an active filter circuit, or an electronic filter circuit; and
the boost circuit is any one of the following: a boost DC/DC converter, a boost circuit, or a boost charge pump.

6. The linear motor driving circuit according to claim 1 , wherein the driver circuit and the rectifier circuit are integrated in a same electronic circuit.

7. The linear motor driving circuit according to claim 1 , wherein the driver circuit and the rectifier circuit are independently disposed in different electronic circuits.

8. A method, applied to a linear motor driving circuit comprising a control circuit, a driver circuit, a linear motor, and an energy recovery circuit, and the method comprising:
controlling, by the control circuit, the driver circuit to stop driving the linear motor to vibrate, wherein the linear motor starts damped vibration after stopping being driven; and
controlling, by the control circuit, the energy recovery circuit to collect electric energy generated by the linear motor during the damped vibration;
wherein the energy recovery circuit comprises a rectifier circuit and an energy storage circuit, and the rectifier circuit comprises a plurality of operational amplifiers and a plurality of feedback resistors; and
wherein controlling, by the control circuit, the energy recovery circuit to collect the electric energy generated by the linear motor during the damped vibration comprises:
converting, by the rectifier circuit, a first voltage generated by the linear motor during the damped vibration into a second voltage, wherein the first voltage is a voltage with alternating positive and negative polarities and a variable amplitude, and the second voltage is a unidirectional pulsating direct current voltage with a constant polarity and a variable amplitude; and

wherein the method further comprises:
storing, by the energy storage circuit, the collected electric energy generated by the linear motor during the damped vibration.

9. The method according to claim 8 , wherein after the energy recovery circuit collects the electric energy generated by the linear motor during the damped vibration, the method further comprises:
supplying, by the energy recovery circuit, the collected electric energy to a first circuit, wherein the first circuit comprises the control circuit or a low-power chip.

10. The method according to claim 8 , wherein before controlling, by the control circuit, the driver circuit to stop driving the linear motor to vibrate, the method further comprises:
controlling, by the control circuit, the driver circuit to start, and driving, by the driver circuit, the linear motor to vibrate.

11. The method according to claim 8 , wherein:
the energy recovery circuit further comprises a filter circuit, and the filter circuit converts the second voltage output by the rectifier circuit into a third voltage, a polarity of the third voltage is the same as that of the second voltage, and an amplitude variation coefficient of the third voltage is lower than that of the second voltage; or
the energy recovery circuit further comprises a boost circuit, and the boost circuit converts the second voltage into a fourth voltage, a polarity of the fourth voltage is the same as that of the second voltage, and an amplitude of the fourth voltage is greater than that of the second voltage; or
the energy recovery circuit further comprises a filter circuit and a boost circuit, the filter circuit converts the second voltage output by the rectifier circuit into a third voltage, and wherein:
the boost circuit converts the third voltage into a fifth voltage, a polarity of the fifth voltage is the same as that of the third voltage, and an amplitude of the fifth voltage is greater than that of t

Assignees

• Honor Device Co Ltd

Inventors

• He Wenqin

Classifications

• H02M3/158

  including plural semiconductor devices as final control devices for a single load · CPC title

• H02P7/04

  by means of a H-bridge circuit · CPC title

• H02P3/14

  by regenerative braking · CPC title

• H02P2201/09

  Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor · CPC title

• H02P7/02

  the DC motors being of the linear type · CPC title