Fan system—single-phase DC motor control circuit and control method thereof

Patent metadata

Field	Value
Publication number	US-9130498-B2
Application number	US-201314102788-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Sep 2, 2013
Publication date	Sep 8, 2015
Grant date	Sep 8, 2015

Abstract

A signal-phase DC motor control circuit is disclosed. The signal-phase DC motor control circuit includes a logic circuit, a switching circuit and a driving circuit. The logic circuit transmits a first logic signal, a second logic signal, a third logic signal and a forth logic signal. The switching circuit transmits a first direction driving signal according to a PWM signal and the first logic signal, and transmits a second direction driving signal according to the PWM signal and the second logic signal. The driving circuit transmits a first output signal according to the first direction driving signal and the fourth logic signal, and transmits a second output signal according to the second direction driving signal and the third logic signal. The first output signal and the second output signal are positive half-wave sinusoidal wave, and the phase difference between the first output signal and the second output signal is 180 degrees.

First claim

What is claimed is:

1. A single-phase DC motor control circuit, comprising:
a logic circuit, connected to a phase-changing signal, for detecting voltage level of the phase-changing signal and outputting a first logic signal, a second logic signal, a third logic signal and a fourth logic signal, wherein phase of the first logic signal is opposite to that of the second logic signal;
a switching circuit, connected to the logic circuit, for receiving a pulse width modulation signal,…

Assignees

• Anpec Electronics Corp

Inventors

• Tsai Ming-Jung
• Li Ching-Sheng
• Yang Chia-Tai

Classifications

• H02P7/29

  Electricity · mapped topic

• H02P25/04 Primary

  Electricity · mapped topic