The invention relates to a device for thermally disconnecting or tripping an overvoltage protection device, comprising: a locking element (A1), on which a first force (F1) acts, and which is fixed in such a way that same is released when a limit temperature is exceeded; and a slider (S1) which is blocked in a first state (Z1) by the fixed locking element (A1), and on which a second force (F2) acts in order to transfer same into a second state (Z2) when the locking element (A1) is released.

An overvoltage protection device includes a resistor that is connected in series between an internal signal line connected to a communication terminal of a processor and a communication line, a diode of which a cathode is connected to the internal signal line and an anode is connected to a ground, and a PNP transistor of which a base is connected to a power supply terminal, an emitter is connected to the internal signal line, and a collector is connected to the ground. When a base-emitter voltage (a junction saturation voltage) of the transistor in operation is defined as VBE and a power source is turned on (a voltage V1) by the operation of the transistor, a voltage of the internal signal line is limited to the source voltage V1+VBE. When the power source is turned off (a voltage 0 V), the voltage of the internal signal line is limited to the source voltage 0 V+VBE.

An electrical energy receiving end capable of overvoltage protection and a wireless electrical energy transmission device are provided. An electrical energy receiving coil is divided into a first receiving coil and a second receiving coil, so that under normal operation the first receiving coil and the second receiving coil jointly resonate with an impedance matching network to receive energy. When the electrical energy receiving end has an overvoltage, the first receiving coil and the impedance matching network (or the second receiving coil and the impedance matching network) form a loop, and due to the impedance mismatch, the energy received by the electrical energy receiving end is greatly reduced to solve the problem of overvoltage at the electrical energy receiving end.