Patent ID: 8099199

Claim:
A digital controller which supplies an output voltage v 0 to a load connected via a load connecting line and is incorporated in an electric power supply wherein said digital controller comprises a manipulating variable calculator to which is configured to be given said output voltage v 0 , a load voltage v L that is a voltage across said load and an arbitrary target value r of said load voltage v L as inputs thereto and is further configured to calculate a manipulating variable ξ 1 (xi 1 ) for said electric power supply and according to a following formula 1 ξ 1 = 1 z ⁡ ( z - F 16 ) - F 15 ⁢ { [ ( z - F 16 ) ⁢ F 12 + F 14 ] ⁢ v o + [ ( z - F 16 ) ⁢ F 112 + F 132 ] ⁢ v L + k z z - 1 ⁡ [ ( z - F 16 ) ⁢ H + H r ] ⁢ ( r - v L ) + [ ( z - F 16 ) ⁢ H + H r ] ⁢ r } [ Formula ⁢ ⁢ 1 ] (wherein z=exp(jωt), and H, H r are poles of transfer functions specified between said target value r and a control variable y and kz, F 12 , F 14 , F 15 , F 16 , F 16 , F 112 , F 132 are preset given parameters) said manipulating variable calculator is configured to calculates said manipulating variable ξ 1 .