Anode power dissipation
The anode power loss P v is the power that is lost in electron tubes in the form of radiation (mainly heat ) at the anode when the electrons accelerated towards the anode of the tube are decelerated there.
The maximum permissible anode power loss is usually specified, which can be dissipated as heat to the environment via the provided options without malfunctions occurring due to excessively high temperatures.
Due to the high electrical voltage between the anode and cathode of electron tubes, the electrons , starting from the cathode, are accelerated towards the anode and give off part of this energy in the form of radiation when they hit the anode. The greater the electron current and the higher the speed of the electrons, the greater the anode loss. The impact speed is a function of the electrical voltage between the anode and cathode.
X-rays are generated at correspondingly high voltages . This is used in X-ray tubes .
A more detailed description of the problems when the anode power loss is exceeded can be found in Electron Tube # Anode .
The anode power loss should as a rule be kept correspondingly low and, if necessary, the temperature of the anode should be kept low by additional measures, for example in the form of a rotating anode .
Relationship with the efficiency
The efficiency η of an electron tube at a certain anode power dissipation P v and the total supplied power P results from:
literature
- Friedrich Benz: Introduction to radio technology . Springer-Verlag, Vienna 1943, p. 143 .