US 2010/0164413 A1 · DRIVING CIRCUIT FOR VOICE COIL MOTOR AND METHOD THEREOF

Abstract

The invention provides a driving circuit for a voice coil motor. In one embodiment, the driving circuit includes a logic circuit, a digital-to-analog converter, and an output circuit. The logic circuit generates a series of samples of a digital output signal according to a digital input signal, wherein the samples of the digital output signal sequentially alter from a first input value of the digital input value to a second input value of the digital input signal according to an alteration pattern determined by a mode selection signal. The digital-to-analog converter converts the digital output signal to an analog output signal. The output circuit generates a driving current signal according to the analog output signal for driving the voice coil motor.

Claims20

Dependent claims

A driving circuit for a voice coil motor, comprising:

a clock generator, generating a control clock signal according to a mode selection signal, wherein the frequency of the control clock signal is determined by the mode selection signal;
a logic circuit, generating a series of samples of a digital output signal according to a digital input signal, wherein the samples of the digital output signal sequentially alter from a first input value of the digital input value to a second input value of the digital input signal according to an alteration pattern determined by the mode selection signal, and the logic circuit outputs one of the samples in response to each clock cycle of the control clock signal;
a digital-to-analog converter, converting the digital output signal to an analog output signal;
and
an output circuit, generating a driving current signal according to the analog output signal for driving the voice coil motor.

2 more elements

A method for driving a voice coil motor, comprising:

selecting a target control mode from a plurality of control modes according to a mode selection signal;
generating a series of samples of a digital output signal according to a digital input signal, wherein the samples of the digital output signal sequentially alter from a first input value of the digital input value to a second input value of the digital input signal according to an alteration pattern determined by the target control mode;
converting the digital output signal to an analog output signal;
and
generating a driving current signal according to the analog output signal to drive the voice coil motor.

2 more elements

A driving circuit for a voice coil motor, comprising:

a logic circuit, generating a series of samples of a digital output signal according to a digital input signal, wherein the samples of the digital output signal sequentially alter from a first input value of the digital input value to a second input value of the digital input signal according to an alteration pattern determined by a mode selection signal;
a digital-to-analog converter, converting the digital output signal to an analog output signal;
and
an output circuit, generating a driving current signal according to the analog output signal for driving the voice coil motor.

1 more element

Dependencies are inferred from the claim text.

Driving circuit for voice coil motor and method thereof

Life of this patent

Driving circuit for voice coil motor and method thereof

Life of this patent

Abstract

Claims20