Method and device for prolonging the service life of ceramic electric heating element under direct-current power supply condition

A device for prolonging the service life of a ceramic electric heating body under a direct-current power supply condition, wherein the device comprises:

• a ceramic electric heating body having an input end with a positive electrode and a negative electrode;
• a direct-current power source having an output end with a positive electrode and a negative electrode;
• a control unit, alternately in a first mode I and a second mode II, selectively connecting the positive and negative electrodes of the ceramic electric heating body with the positive and negative electrodes of the direct-current power source, wherein:
• the positive electrode of a direct-current power source is directly connected to a first terminal I of the control unit,
• the negative electrode of the direct-current power source is directly connected to a second terminal II of the control unit,
• a third terminal III of the control unit is connected to a positive electrode of a ceramic electric heating body, and
• a fourth terminal IV of the control unit is connected to a negative electrode of the ceramic electric heating body;
• wherein during the first mode I, the control unit is configured to match the first terminal I with the third terminal III and match the second terminal II with the fourth terminal IV (4), wherein the control unit transmits electric energy of the direct-current power source to the ceramic electric heating body in a first direction between the positive and negative electrodes of the ceramic heating body and transmits the electric energy in a pulse manner;
• and
• wherein during the second mode II, the control unit is configured to match the terminal I (1) with the terminal IV (4) and match the terminal II (2) with the terminal III (3), wherein the control unit transmits electric energy of the direct-current power source to the ceramic electric heating body in a second direction between the positive and negative electrodes of the ceramic heating body and transmits the electric energy in a pulse manner.