Fan system and seriate starting module and delayed starting unit thereof

Abstract

A fan system for receiving an input voltage from exterior includes a first fan module, a second fan module and a seriate starting module. The seriate starting module is electrically connected with the first fan module and the second fan module. The seriate starting module receives the input voltage and starts the first fan module according to the input voltage, and starts the second fan module according to the input voltage after the first fan module is started for a predetermined time.

1 . A fan system for receiving an input voltage from exterior, the fan system comprising: 
 a first fan module;    a second fan module; and    a seriate starting module electrically connected with the first fan module and the second fan module for receiving the input voltage, starting the first fan module according to the input voltage, and starting the second fan module according to the input voltage after the first fan module is started for a predetermined time.    
   
   
       2 . The fan system according to  claim 1 , wherein the seriate starting module comprises: 
 a starting unit electrically connected with the first fan module for receiving the input voltage and starting the first fan module according to the input voltage; and    a delayed starting unit electrically connected with the second fan module for receiving the input voltage and starting the second fan module according to the input voltage after the first fan module is started for the predetermined time.    
   
   
       3 . The fan system according to  claim 2 , wherein the delayed starting unit comprises: 
 a starting circuit having a first switch element and a second switch element, wherein the first switch element receives the input voltage, and the second switch element is electrically connected with the first switch element to control the first switch element to start the second fan module; and    a delaying circuit electrically connected with the first switch element and the second switch element for receiving the input voltage, and controlling the first switch element and the second switch element to start the second fan module after the first fan module is started for the predetermined time.    
   
   
       4 . The fan system according to  claim 3 , wherein the starting circuit further has at least one diode, and the diode has a first terminal for receiving the input voltage and a second terminal electrically connected with the first switch element.  
   
   
       5 . The fan system according to  claim 4 , wherein: 
 each of the first switch element and the second switch element is a transistor;    the first switch element has a source electrically connected with the second terminal of the diode, and a drain electrically connected with the second fan module; and    the second switch element has a gate electrically connected with the delaying circuit, and a drain electrically connected with the second terminal of the diode and a gate of the first switch element.    
   
   
       6 . The fan system according to  claim 5 , wherein the first switch element is a PMOS transistor and the second switch element is an NMOS transistor.  
   
   
       7 . The fan system according to  claim 3 , wherein the delaying circuit comprises: 
 a third switch element having one terminal for receiving the input voltage;    a fourth switch element electrically connected with the third switch element;    a first resistor having a second terminal and a first terminal electrically connected with the fourth switch element;    a capacitor having a first terminal and a second terminal, wherein the first terminal of the capacitor is electrically connected with the second terminal of the first resistor, the second terminal of the capacitor is grounded, and the first terminal of the capacitor generates a control signal when the fourth switch element turns on; and    a comparator having a first input terminal for receiving the control signal, a second input terminal for receiving a reference signal, and an output terminal electrically connected with the second switch element for controlling the second switch element.    
   
   
       8 . The fan system according to  claim 7 , wherein the delaying circuit further comprises a fifth switch element electrically connected with the first terminal of the capacitor, and a sixth switch element electrically connected with the fifth switch element.  
   
   
       9 . The fan system according to  claim 8 , wherein the delaying circuit further comprises: 
 a second resistor having a second terminal and a first terminal receiving the input voltage;    a third resistor having a first terminal electrically connected with the second terminal of the second resistor, and a second terminal grounded; and    a fourth resistor having a first terminal electrically connected with the sixth switch element, and a second terminal electrically connected with the starting unit.    
   
   
       10 . The fan system according to  claim 8 , wherein the third switch element, the fourth switch element, the fifth switch element, and the sixth switch element are all transistors.  
   
   
       11 . The fan system according to  claim 8 , wherein the fifth switch element and the sixth switch element are electrically connected with the starting unit.  
   
   
       12 . The fan system according to  claim 11 , wherein the starting unit comprises another capacitor electrically connected with the fifth switch element.  
   
   
       13 . The fan system according to  claim 7 , wherein the predetermined time is determined according to a charging time of the first resistor and the capacitor.  
   
   
       14 . The fan system according to  claim 7 , wherein the first input terminal is a noninverting input terminal, and the second input terminal is an inverting input terminal.  
   
   
       15 . The fan system according to  claim 7 , wherein the first resistor is a variable resistor.  
   
   
       16 . The fan system according to  claim 1 , wherein each of the first fan module and the second fan module comprises at least one fan.  
   
   
       17 . A method of resetting a delaying circuit, wherein the delaying circuit is coupled with an input voltage from exterior and has a capacitor and a switch element, and the switch element receives the input voltage and is electrically connected with the capacitor and grounded, the method comprising the steps of: 
 separating the delaying circuit from the input voltage;    turning on the switch element; and    forming a discharge path from the capacitor to the switch element so as to perform a discharging operation.    
   
   
       18 . The method according to  claim 17 , wherein the switch element turns on by a turn-on voltage provided by an additional capacitor.  
   
   
       19 . The method according to  claim 18 , wherein the switch element is a transistor.  
   
   
       20 . The method according to  claim 17 , wherein the switch element has a base for receiving the input voltage and electrically connected with the additional capacitor, a collector electrically connected with the capacitor, and an emitter grounded.