Electronically-frequency-controlled voltage adjustment device and method for retaining freshness of foods by using the same

Abstract

An electronically-frequency-controlled voltage adjustment device comprises a power supply for providing voltages to an object; a temperature sensor for sensing temperatures of the object; a temperature control unit receiving temperature signals from the temperature sensor and outputting temperature variation signals; a voltage adjustment unit for adjusting output voltages of the power supply based on the temperature variation signals from the temperature control unit; and a frequency generator for generating oscillating current intermittently. Furthermore, a method for unfreezing and retaining the freshness of foods is also provided. The method uses the electronically-frequency-controlled voltage adjustment device to various freezing device and fries device so as to retain the freshness of foods.

1 . An electronically-frequency-controlled voltage adjustment device comprising: 
 a power supply for providing voltages to an object;    a temperature sensor for sensing temperatures of the object;    a temperature control unit receiving temperature signals from the temperature sensor and outputting temperature variation signals;    a voltage adjustment unit for adjusting output voltages of the power supply based on the temperature variation signals from the temperature control unit; and    a frequency generator for generating oscillating current intermittently.    
   
   
       2 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 1 , wherein the frequency generator has a delaying switch, a programmable controller, and a current oscillator; the delaying switch controls the current oscillator intermittently based on the programmable controller so as to generate intermittent oscillating current.  
   
   
       3 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 1 , wherein the voltage adjustment unit includes a plurality of voltage selectors.  
   
   
       4 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 1 , wherein the power supply supplies one of alternating current and direct current.  
   
   
       5 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 1 , further comprising: 
 a first side current meter for measuring input currents; and    a secondary side voltage meter for measuring output voltages.    
   
   
       6 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 1 , wherein the input voltages of the power supply is between 100 Volts to 5000 volts.  
   
   
       7 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 1 , further comprising: 
 a frequency generator switch for switching the frequency generator.    
   
   
       8 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 1 , further comprising 
 an alarm light.    
   
   
       9 . A method for unfreezing and retaining the freshness of foods; 
 comprising the steps of:    supplying voltages by using a power supply;    placing electrodes in an isolating space;    providing the voltages to a food to be process through the electrodes from the power supply;    sensing temperatures of the food by using a temperature sensor;    receiving temperature signals from the temperature sensor and outputting temperature variation signals by using a temperature control unit; and    adjusting the supply voltages based on the signals from the temperature control unit by using a voltage adjustment unit.    
   
   
       10 . The method as claimed in  claim 1 , wherein a frequency generator is used for generating oscillating current intermittently.  
   
   
       11 . The method as claimed in  claim 9 , wherein the frequency generator has a delaying switch, a programmable controller, and a current oscillator; and the delaying switch controls the current oscillator intermittently based on the programmable controller so as to generate intermittent oscillating current.  
   
   
       12 . The electronically-frequency-controlled voltage adjustment device as claimed in  claim 9 , wherein the voltage adjustment unit includes a plurality of voltage selectors.  
   
   
       13 . The method as claimed in  claim 9 , wherein the power supply supplies one of alternating current and direct current.  
   
   
       14 . The method as claimed in  claim 9 , wherein a frequency generator switch is used for switching the frequency generator.