| 摘要 |
The invention relates to a method for realizing power supply into an electric switch (1), and a respective power supply arrangement for an electric switch. The switch is arranged in the current path (J), between an AC current source (E), preferably an AC current mains, and a load (L) in order to interrupt and enable power supply. The switch is also arranged in series with the primary circuit (W1) of a current transformer (3). The electric power required by the control unit (2) of the switch an possibly of the switch itself is taken over the switch when the switch is on (a) and from the secondary circuit (W2) of the current transformer via a rectifier (4), when the switch is off and power is fed to the load (L). According to the invention, the current transformer (3) is arranged to function so that it is saturated at each halfcycle of the mains current, and the saturation peaks (KP) of the secondary voltage (W2; W2a; W2b) of the secondary circuit of the current transformer are rectified in order to obtain direct electric power, when the switch (1) is off (k). |
