Control device and program product for reducing a noise peak level
AssigneeShindengen Electric Manufacturing Co., Ltd.
InventorsTakayuki Kondo, Tomohiro Tanabe
Life of this patent
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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.
Claims1
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,
- wherein the frequency changing unit changes the frequency of the control signal according to the change value defined in the frequency table, and
- wherein the frequency changing unit performs one of:
- changing of the frequency of the control signal to a predetermined upper limit, when a value obtained by adding the change value defined in the frequency table to the frequency of the control signal is greater than the upper limit, and
- changing of the frequency of the control signal to a predetermined lower limit, when a value obtained by subtracting the change value defined in the frequency table from the frequency of the control signal is smaller than the lower limit.
Dependencies are inferred from the claim text.