| 摘要 |
The utility model relates to a power supply (200) comprising an accumulator (103) for supporting output voltage (U_s) of the power supply, and an electrically controlled switch (104b) with two states, wherein, the electrically controlled switch (104b) in the first state allows current flow to flow through the accumulator (103), and prevents the current flow flowing through the accumulator (103) in the second state. The power supply also comprises a control unit (105) for keeping the electrically controlled switch (104b) in the first state, and a standby circuit (202) arranged to compare (202a) the output voltage (U_s) of the power supply with a first threshold value (U_s1) and to keep the electrically controlled switch (104b) in the first state when the output voltage (U_s) of the power supply is higher than the first threshold value (U_s1). |
