|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||G06F-015/332 H02K-023/64 H02P-006/06 H02P-005/16|
|미국특허분류(USC)||318/254 ; 318/245 ; 318/434 ; 318/599|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 8 인용 특허 : 16|
A method and a circuit configuration for detecting the rotational speed of electronically commutated fans include measuring maximum current gradients of current fluctuations caused by the fan on its power supply lines, and adapting an amplification range and switching threshold of a comparator used as an input stage for a pulse former.
[ I claim:] [1.]1. A method for detecting the rotational speed of electronically commutated fans, which comprises:indicating a rotational speed of an electronically commutated fan with a clock signal having a corresponding number of clock pulses per unit time;forming the clock pulses of the clock signal with a pulse former having a comparator serving as an input stage;measuring maximum current gradients of current fluctuations caused by the fan on power supply lines of the fan as a function of the rotational speed; andautomatically adapting an amplificat...