Control device and program product

Abstract

The control device includes a control signal supply unit, a frequency changing unit, and a storage unit. The control signal supply unit generates a control signal, and supplies the generated control signal to the switching element. The storage unit stores a frequency table defining a change value of a frequency of the control signal. The frequency changing unit changes the frequency of the control signal every time a predetermined time period elapses, according to the change value defined in the frequency table.

1 . A control device that controls a frequency of a control signal for controlling on and off of a switching element, the control device comprising:
 a storage unit configured to store a frequency table defining a change value for a frequency of the control signal; and   a frequency changing unit configured to change the frequency of the control signal, independent of an input voltage, every time a predetermined time period elapses, according to the change value defined in the frequency table.   
     
     
         2 . The control device according to  claim 1 , wherein the frequency changing unit performs an operation to the frequency of the control signal based on the change value defined in the frequency table, and changes the frequency of the control signal to a result of the operation. 
     
     
         3 . The control device according to  claim 1 , wherein the frequency changing unit changes the frequency of the control signal according to the change value defined in the frequency table. 
     
     
         4 . (canceled) 
     
     
         5 . The control device according  claim 1 , wherein the frequency changing unit changes the frequency of the control signal using spread spectrum. 
     
     
         6 . A program product including a non-transitory computer readable medium storing a program which, when executed by a computer, causes the computer to perform a control method of controlling a frequency of a control signal for controlling on and off of a switching element, the method comprising: changing a frequency of the control signal, independent of an input voltage of the switching element, every time a predetermined time period elapses, according to a change value defined in a frequency table. 
     
     
         7 . A control device that controls a frequency of a control signal for controlling on and off of a switching element, the control device comprising:
 a storage unit configured to store a frequency table defining a change value for a frequency of the control signal; and   a frequency changing unit configured to change the frequency of the control signal, every time a predetermined time period elapses, according to the change value defined in the frequency table,   wherein the frequency is not changed during the predetermined period.