An adapter, comprising: a power conversion unit, configured to convert an input alternating current to obtain an output voltage and an output current of the adapter, wherein the output current of the adapter is a pulsating direct current; a voltage holding unit, wherein an input end of the voltage holding unit is coupled to the power conversion unit, the voltage holding unit is configured to obtain an input current with a pulsating waveform from the power conversion unit and to convert the input voltage with the pulsating waveform into a target voltage, an output end of the voltage holding unit is coupled to a component of the adapter such that the component is powered by the target voltage, in which, a peak value of the target voltage is between a lowest operation voltage value and a highest operation voltage value of the component, wherein the power conversion unit comprises a primary unit and a secondary unit, the voltage holding unit is coupled to the secondary unit and the voltage holding unit is further configured to convert a voltage with a pulsating waveform, wherein the voltage with a pulsating waveform is coupled to the secondary unit from the primary unit, into the target voltage to power the component, the voltage holding unit comprises: a rectifying unit, wherein an input end of the rectifying unit is coupled to the secondary unit, and the rectifying unit is configured to rectify a current of the secondary unit to obtain a pulsating current and voltage; and a filter unit, wherein an input end of the filter unit is coupled to an output end of the rectifying unit and an output end of the filter unit is coupled to the component, and the filter unit is configured to convert the pulsating voltage into the target voltage and to supply power to the component based on the target voltage, and wherein further the pulsating waveform is subject to peak clipping in which a part of the pulsating waveform exceeding a certain threshold is filtered out. a power conversion unit, configured to convert an input alternating current to obtain an output voltage and an output current of the adapter, wherein the output current of the adapter is a pulsating direct current; a voltage holding unit, wherein an input end of the voltage holding unit is coupled to the power conversion unit, the voltage holding unit is configured to obtain an input current with a pulsating waveform from the power conversion unit and to convert the input voltage with the pulsating waveform into a target voltage, an output end of the voltage holding unit is coupled to a component of the adapter such that the component is powered by the target voltage, in which, a peak value of the target voltage is between a lowest operation voltage value and a highest operation voltage value of the component, wherein the power conversion unit comprises a primary unit and a secondary unit, the voltage holding unit is coupled to the secondary unit and the voltage holding unit is further configured to convert a voltage with a pulsating waveform, wherein the voltage with a pulsating waveform is coupled to the secondary unit from the primary unit, into the target voltage to power the component, the voltage holding unit comprises: a rectifying unit, wherein an input end of the rectifying unit is coupled to the secondary unit, and the rectifying unit is configured to rectify a current of the secondary unit to obtain a pulsating current and voltage; and a filter unit, wherein an input end of the filter unit is coupled to an output end of the rectifying unit and an output end of the filter unit is coupled to the component, and the filter unit is configured to convert the pulsating voltage into the target voltage and to supply power to the component based on the target voltage, and a rectifying unit, wherein an input end of the rectifying unit is coupled to the secondary unit, and the rectifying unit is configured to rectify a current of the secondary unit to obtain a pulsating current and voltage; and a filter unit, wherein an input end of the filter unit is coupled to an output end of the rectifying unit and an output end of the filter unit is coupled to the component, and the filter unit is configured to convert the pulsating voltage into the target voltage and to supply power to the component based on the target voltage, and wherein further the pulsating waveform is subject to peak clipping in which a part of the pulsating waveform exceeding a certain threshold is filtered out.