| US 7,598,691 B2 | ||
| Current control device and method | ||
| Po-Tsun Kuo, Taoyuan Hsien (Taiwan); Wen-Chuan Ma, Taoyuan Hsien (Taiwan); Ming-Shi Tsai, Taoyuan Hsien (Taiwan); and Wen-Shi Huang, Taoyuan Hsien (Taiwan) | ||
| Assigned to Delta Electronics, Inc., Taoyuan Hsien (Taiwan) | ||
| Filed on Jul. 12, 2006, as Appl. No. 11/484,716. | ||
| Claims priority of application No. 94128836 A (TW), filed on Aug. 24, 2005. | ||
| Prior Publication US 2007/0044756 A1, Mar. 01, 2007 | ||
| Int. Cl. H02P 7/00 (2006.01); H02K 17/32 (2006.01); H02K 23/68 (2006.01); H02K 27/30 (2006.01) | ||
| U.S. Cl. 318—434 [318/432; 318/400.22] | 22 Claims |
| 1. A current control device for a fan motor, comprising:
a current sampling module for sampling an operating current of the fan motor to generate a sampled current signal, wherein
the operating current is controlled according to a driving signal of the fan motor;
a signal generating module for generating a threshold current signal;
a current detecting module for receiving the sampled current signal and the threshold current signal and generating a protecting
signal according to the threshold current signal and the sampled current signal; and
a current controlling module for receiving the protecting signal and then stopping generating or decreasing the driving signal
according to the protecting signal;
wherein the signal generating module comprises:
a first resistor having one grounded terminal; and
a second resistor having one terminal connected to the first resistor in series and the other terminal for receiving a power
so as to generate the threshold current signal.
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