in order that those skilled in the art can further understand the present invention , a description will be described in the following in details . however , these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects , features , and characteristics of the present invention , but not to be used to confine the scope and spirit of the present invention defined in the appended claims . with reference to fig1 , the electronically - frequency - controlled voltage adjustment device 20 of the present invention is illustrated . the present invention includes a high voltage transformer 10 , and a plurality of voltage selectors 11 connected to the high voltage transformer 10 ; a voltage output port 12 connected to all the voltage selectors 11 , and a temperature control unit 13 connected to all the voltage selectors 11 and a temperature sensor 14 connected the temperature control unit 13 . the temperature sensor 14 serves to transfer the temperature of a sensed object to the temperature control unit 13 . the temperature control unit 13 generates different voltages according to the temperature and the voltages are output from the voltage output port 12 . in the present invention , the voltages of 1000v , 2000v , 3000v and 4000v are used as an example , but other values between 100v to 5000v are permissible in the present invention . referring to fig1 - 1 , a part of the feedback circuit is illustrated . when the temperature is changed , the value of the temperature sensor 14 will be feedback to the high voltage transformer 10 . the output is adjusted by the setting programmable parameter . when the load is changed , the voltage selectors 11 selects output voltage to the front high voltage transformer 10 to control the output of the setting voltage . in the prior art , the output voltage is fixed by the ratio of the first side coil to the secondary side coil , but in the present invention , when the input voltage is changed due to the variations of the temperature and load , the output voltage is also changed according to the predetermined program control logic without manual operation . the temperature control unit 13 and the voltage selectors 11 adjust the output voltage according to the temperature from the temperature sensor 14 . thereby the unfreezing of food is based on an effective work curve . fig2 shows the box of the electronically - frequency - controlled voltage adjustment device 20 according to the present invention . in fig2 , in one embodiment of the present invention , one side of the box of the electronically - frequency - controlled voltage adjustment device 20 is a first side current meter 21 for measuring input current , and another side of the box is a secondary side voltage meter 22 for outputting voltage after changed . the box also has a switch 23 for determining whether the frequency generator is used , a fault alarm 24 , and a power switch 25 . fig2 show the bottom plate 30 of the electronically - frequency - controlled voltage adjustment device 20 of the present invention . in fig3 , the voltage providing unit 31 provides input voltage . then a conductive electrode is placed in an insulating space . the high voltage is conductive to a center of a food to be processed . the temperature control and adjusting unit 32 transfers temperature signals to the voltage adjustment unit 33 based on the variation of the conductor temperature . then the voltage adjustment unit 32 selectively adjusts the voltage values of the voltage providing unit 31 . referring to fig4 , the frequency generator 40 has a delaying switch 41 , a programmable controller 42 , and a current oscillator 43 . when it is necessary to unfreeze quickly , the frequency generator 40 is actuated by a frequency selector . then the delaying switch 41 controls the current oscillator 43 intermittently based on the programmable controller 42 so as to generate intermittent oscillating current . when it is necessary to retain the foods in a fresh state , the frequency generator 40 can be neglected . fig5 shows one embodiment of the present invention , where the electronically - frequency - controlled voltage adjustment device 20 is used to a refrigerator . in fig5 , the outer sides of two inner wall of the refrigerator 50 are installed with conductive materials 52 and inner sides thereof are installed with wind nets 53 . a tray of the refrigerator is installed with conductive nets 54 . when the high voltage will cause that nitrogen generates from air . since foods contain water which is a conductor , the whole food will form as electric carriers . water molecules move dramatically in high voltage . the electrons in water molecules will ionize . electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials . fig6 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is applied to a cake freeze 60 . in fig6 , conductive material 61 is placed upon the cake freezer . insulating material 63 is adjacent to the conductive material 62 . the foods to be processed are placed upon the insulating material 63 . similarly , since the function of the high voltage will make air change so as to generate nitrogen . since cakes contain water which is a conductor , the whole food will form as electric carriers . water molecules move dramatically in high voltage . the electrons in water molecules will ionize . electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials . fig7 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is applied to a seafood freezer , it has the same effect as described in fig6 . fig8 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is applied to a juicer . in fig8 , the electronically - frequency - controlled voltage adjustment device 20 is placed upon a container 80 for agitating juice . when conductor contacts with water , by the high voltage effect , since the function of the high voltage will make air change so as molecule moves dramatically in high voltage . the electrons in water molecules will ionize . electrons in water molecules will be formed as covalent bonds . the water molecules become smaller so that they can be absorbed easily . this kind of juice can increase the permeability of germs to assist the excretion of heavy metal or harmful material from human bodies to the circulation of blood and increase immunity . furthermore , high voltage causes water to ionize as oxide and hydrogen and cause part of oxygen as ozone which is a strong oxidizing agent so as to have the function of sterilization . thereby the increment of oxygen has the effect of increase immunity . besides the color of the juicy may retain to a fresh state . thereby the juicy can retain with a long period . fig9 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is applied to a refreezing box . in fig9 , the electronically - frequency - controlled voltage adjustment device 20 is connected to a web 91 of an unfreezing box 90 . the web 90 is isolated with an insulating device 92 . furthermore , the food 93 on the web 91 has a high voltage . thereby the foods to be unfreezed may be worked in an effect area of unfreezation so as to reduce the unfreezation time period and thus the food has a preferred quality . fig1 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is applied to an oven . in fig1 , it is illustrated that the voltage of the electronically - frequency - controlled voltage adjustment device 20 is transferred to a web 101 which is insulated from a casing . the foods on the web have the high voltage . conventionally , since in the conventionally oven , foods are roasted at the outer sides . it is possible that the outer side of the foods are burned black , but the center portion of the foods are retained in an un - roasted state . by the present invention , a large amount of electric charges are accumulated on the surface of food and structure of air is changed . oxygen ions are separated and the surface of the food is coated with nitrogen so as to prevent from infection of germs . thus the food is retained in fresh state and foul smell is removed . fig1 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is used to an open type refrigerator . in fig1 , the open type refrigerator 110 has a conductive material 111 thereon . the conductive material 111 is connected with a conductive wire . the insulating material 112 is adjacent to the conductive material 111 . the foods to be processed are placed upon the conductive material 112 . in use of the device , when conductor contacts with water , by the high voltage effect , since the function of the high voltage will make air change , molecules move dramatically in high voltage . the electrons in water molecules will ionize . electrons in water molecules will be formed as covalent bonds . when the high voltage causes that nitrogen generates from air , since foods contain water which is a conductor , the whole food will form as electric carriers . water molecule moves dramatically in high voltage . the electrons in water molecules will ionize . electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials so as to retain the food in fresh state . fig1 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is applied to a freezer 120 . in fig1 , a control box is installed at an outer side of the freezer 120 when a cart formed of conductive material 121 and insulating wheels 122 enters into the freezer 120 , the carts carry foods to be froze . the high voltage of the control box will be applied to the foods . since foods contain water which is a conductor , the whole food will form as electric carriers . water molecule moves dramatically in high voltage . the electrons in water molecules will ionize . electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials so as to retain the food in fresh state . fig1 shows that the electronically - frequency - controlled voltage adjustment device 20 of the present invention is applied to a fried machine 130 . in fig1 , the fried machine 130 is installed with an electronically - frequency - controlled voltage adjustment device 20 . a oil tank 131 is conductive . foods containing water is placed into oil . in fried process , heat is uniformly transferred into the food by induction . thereby the fried process is speeded and the oil temperature can be reduced . it is impossible that the center portion is not heated . thereby the color of the food is beautiful . furthermore , water in food is ionized so that water molecules are conduced to have higher density . thus , water is retained in the fried foods . since micro current will transfer through the food , when the food is placed within electric field , it will isolate with oxygen . the greasy will not oxide and the lifetime of greasy will prolong . the small particles in the fried machine will precipitate . the grease will not become worse . the present invention is thus described , it will be obvious that the same may be varied in many ways . such variations are not to be regarded as a departure from the spirit and scope of the present invention , and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims .
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 .