A power control device, wherein the power control device comprises: a setting part which receives a setting of the number (n) of control channels (CH1, CH2, CH3, CH4) simultaneously outputting conduction control signals and a setting of a control period (Ts); a calculation part which calculates an upper limit value (tdMm) of an electrification quantity for each control channel and a first delay time (tDM) in starting of control of each control channel with respect to a starting timing of an effective control period (Te) using a total number of control channels (CH1, CH2, CH3, CH4), the number (n) of control channels (CH1, CH2, CH3, CH4) simultaneously outputting the conduction control signals, and the control period (Ts); and a control part which executes conduction control and disconnection control for each control channel using the upper limit value (tdMm) of the electrification quantity of each control channel and the first delay time (tDM) in starting of control of each control channel, wherein the setting part receives setting of a second delay time (τb) between control channels (CH1, CH2, CH3, CH4), wherein the calculation part calculates the effective control period (Te) as Te=Ts+(τb×N) using the total number of control channels (CH1, CH2, CH3, CH4), the second delay time (τb) and the control period (Ts), wherein the calculation part calculates the upper limit value (tdMm) of the electrification quantity for each control channel and the first delay time (tDM) in starting of control of each control channel on the basis of the effective control period (Te), wherein the calculation part calculates a conduction time according to calculation for feedback control for each control channel and sets an effective electrification quantity of the control channel using an electrification quantity according to the calculation for feedback control and the upper limit value (tdMm) of the electrification quantity, and wherein the calculation part sets the effective electrification quantity of the control channel to the electrification quantity according to the calculation for feedback control if the electrification quantity according to the calculation for feedback control is less than the upper limit value (tdMm) of the electrification quantity. a setting part which receives a setting of the number (n) of control channels (CH1, CH2, CH3, CH4) simultaneously outputting conduction control signals and a setting of a control period (Ts); a calculation part which calculates an upper limit value (tdMm) of an electrification quantity for each control channel and a first delay time (tDM) in starting of control of each control channel with respect to a starting timing of an effective control period (Te) using a total number of control channels (CH1, CH2, CH3, CH4), the number (n) of control channels (CH1, CH2, CH3, CH4) simultaneously outputting the conduction control signals, and the control period (Ts); and a control part which executes conduction control and disconnection control for each control channel using the upper limit value (tdMm) of the electrification quantity of each control channel and the first delay time (tDM) in starting of control of each control channel, wherein the setting part receives setting of a second delay time (τb) between control channels (CH1, CH2, CH3, CH4), wherein the calculation part calculates the effective control period (Te) as Te=Ts+(τb×N) using the total number of control channels (CH1, CH2, CH3, CH4), the second delay time (τb) and the control period (Ts), wherein the calculation part calculates the upper limit value (tdMm) of the electrification quantity for each control channel and the first delay time (tDM) in starting of control of each control channel on the basis of the effective control period (Te), wherein the calculation part calculates a conduction time according to calculation for feedback control for each control channel and sets an effective electrification quantity of the control channel using an electrification quantity according to the calculation for feedback control and the upper limit value (tdMm) of the electrification quantity, and wherein the calculation part sets the effective electrification quantity of the control channel to the electrification quantity according to the calculation for feedback control if the electrification quantity according to the calculation for feedback control is less than the upper limit value (tdMm) of the electrification quantity.