Fan system and temperature-sensing protecting device thereof

Abstract

A fan system includes a fan module, a starting module, a temperature-sensing element and a controlling module. The starting module is electrically connected with the fan module for starting it. The temperature-sensing element generates a sensing signal in accordance with an ambient temperature. The controlling module receives the sensing signal for controlling the starting module. When the ambient temperature is higher than a first temperature or is lower than a second temperature, the controlling module controls the starting module to disable the fan module.

1 . A fan system comprising: 
 a fan module;    a starting module electrically connected with the fan module for starting the fan module;    a temperature-sensing element for generating a sensing signal in accordance with an ambient temperature; and    a controlling module receiving the sensing signal for controlling the starting module, wherein the controlling module controls the starting module to disable the fan module when the ambient temperature is higher than a first temperature or lower than a second temperature.    
   
   
       2 . The fan system of  claim 1 , wherein the controlling module comprises: 
 a first controlling unit electrically connected with the temperature-sensing element and controlling the starting module in accordance with the sensing signal, wherein the first controlling unit controls the starting module to disable the fan module when the ambient temperature is higher than the first temperature; and    a second controlling unit electrically connected with the temperature-sensing element and controlling the starting module in accordance with the sensing signal, wherein the second controlling unit controls the starting module to disable the fan module when the ambient temperature is lower than the second temperature.    
   
   
       3 . The fan system of  claim 2 , wherein the first controlling unit comprises: 
 a first switch element electrically connected with the starting module; and    a first comparator having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal receives a first reference signal, the second input terminal receives the sensing signal, and the output terminal is electrically connected with the first switch element for controlling the first switch element.    
   
   
       4 . The fan system of  claim 3 , wherein the second controlling unit comprises: 
 a second switch element electrically connected with the starting module; and    a second comparator having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal receives the sensing signal, the second input terminal receives a second reference signal, and the output terminal is electrically connected with the second switch element for controlling the second switch element.    
   
   
       5 . The fan system of  claim 4 , wherein the first switch element and the second switch element are transistors, respectively.  
   
   
       6 . The fan system of  claim 1 , wherein the starting module comprises: 
 a third switch element having a terminal electrically connected with the fan system for controlling the fan system;    a fourth switch element electrically connected with the third switch element for controlling the third switch element;    a capacitor having a terminal electrically connected with the third switch element;    a resistor electrically connected with the capacitor; and    at least a diode having a first terminal for receiving an input voltage and a second terminal electrically connected with the third switch element.    
   
   
       7 . The fan system of  claim 6 , wherein the third switch element and the fourth switch element are transistors or any other electronic elements with the switch function, respectively.  
   
   
       8 . The fan system of  claim 1 , wherein the temperature-sensing element is a thermistor or a negative temperature coefficient (NTC) thermistor.  
   
   
       9 . A temperature-sensing protecting device, which cooperates with a fan module, comprising: 
 a starting module electrically connected with the fan module for starting the fan module;    a temperature-sensing element for generating a sensing signal in accordance with an ambient temperature; and    a controlling module receiving the sensing signal for controlling the starting module, wherein the controlling module controls the starting module to disable the fan module when the ambient temperature is higher than a first temperature or lower than a second temperature.    
   
   
       10 . The temperature-sensing protecting device of  claim 9 , wherein the controlling module comprises: 
 a first controlling unit electrically connected with the temperature-sensing element and controlling the starting module in accordance with the sensing signal, wherein the first controlling unit controls the starting module to disable the fan module when the ambient temperature is higher than the first temperature; and    a second controlling unit electrically connected with the temperature-sensing element and controlling the starting module in accordance with the sensing signal, wherein the second controlling unit controls the starting module to disable the fan module when the ambient temperature is lower than the second temperature.    
   
   
       11 . The temperature-sensing protecting device of  claim 10 , wherein the first control unit comprises: 
 a first switch element electrically connected with the starting module; and    a first comparator having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal receives the first reference signal, and the second input terminal receives the sensing signal, and the output terminal is electrically connected with the first switch element for controlling the first switch element.    
   
   
       12 . The temperature-sensing protecting device of  claim 11 , wherein the second control unit comprises: 
 a second switch element electrically connected with the starting module; and    a second comparator having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal receives the sensing signal, the second input terminal receives a second reference signal, and the output terminal is electrically connected with the second switch element for controlling the second switch element.    
   
   
       13 . The temperature-sensing protecting device of  claim 12 , wherein the first switch element and the second switch element are transistors or any other electronic elements with the switch function, respectively.  
   
   
       14 . The temperature-sensing protecting device of  claim 12 , wherein the first input terminal of the first comparator or the second comparator is a noninverting input terminal, and the second input terminal of the first comparator or the second comparator is an inverting input terminal.  
   
   
       15 . The temperature-sensing protecting device of  claim 11 , wherein the second input terminal and the output terminal of the first comparator are electrically connected with a resistor, respectively.  
   
   
       16 . The temperature-sensing protecting device of  claim 12 , wherein the first input terminal and the output terminal of the second comparator are electrically connected with a resistor, respectively.  
   
   
       17 . The temperature-sensing protecting device of  claim 9 , wherein the starting module comprises: 
 a third switch element having a terminal is electrically connected with the fan system for controlling the fan system;    a fourth switch element electrically connected with the third switch element for controlling the third switch element;    a capacitor having a terminal electrically connected with the third switch element;    a resistor electrically connected with the capacitor; and    at least a diode having a first terminal for receiving an input voltage and a second terminal electrically connected with the third switch element.    
   
   
       18 . The temperature-sensing protecting device of  claim 17 , wherein the third switch element and the fourth switch element are transistors or any other electronic elements with the switch function, respectively.  
   
   
       19 . The temperature-sensing protecting device of  claim 9 , wherein the temperature-sensing element is a thermistor or a negative temperature coefficient (NTC) thermistor.