Dc motor device and dc fan using the same
AssigneeDelta Electronics, Inc.
InventorsHsin-Chih LIN, Ya-Sen TU, Lee-Long CHEN, Kuo-Cheng LIN
Life of this patent
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Abstract
A DC motor device includes a first converting circuit, a second converting circuit, and a DC motor. A switch element is coupled to the DC motor device, and provides an alternating current to the first or second converting circuit. The first converting circuit receives the alternating current, and generates a first rotation speed signal. The second converting circuit receives the alternating current, and generates a second rotation speed signal. The DC motor is driven at a rotation speed according to the first or second rotation speed signal.
Claims20
A DC motor device for an alternating current and coupled to a switch element, the DC motor device comprising:
- a first converting circuit, comprising:
- a first rectifier circuit, receiving the alternating current, generating a first direct current;
- and
- a first modulator module, receiving the alternating current, generating a first rotation speed signal;
- a second converting circuit, comprising:
- a second rectifier circuit, receiving the alternating current, generating a second direct current;
- and
- a second modulator module, receiving the alternating current, generating a second rotation speed signal;
- and
- a DC motor, receiving one of the first direct current and the second direct current, driven at a corresponding rotation speed according to one of the first rotation speed signal and the second rotation speed signal,
- wherein the switch element selectively applies the alternating current to one of the first converting circuit and the second converting circuit.
Dependencies are inferred from the claim text.