Electrostatic precipitator

An electrostatic precipitator, comprising:

• an ionization stage,
• a collector stage, and
• a power supply, the power supply comprising a first high-voltage power supply unit configured to apply a first DC high voltage to the ionization stage and a second high-voltage power supply unit configured to apply a second DC high voltage to the collector stage, wherein
• the first high-voltage power supply unit comprises a first current sensor and a first voltage controller,
• the first current sensor is configured to measure an ionization current flowing through the ionization stage,
• the first voltage controller is configured to ensure that the first DC high voltage is adjusted so that the ionization current reaches a predetermined value,
• the electrostatic precipitator has a terminal which can be connected to earth ground,
• the ionization stage and the collector stage contain electrodes which are connected to the terminal,
• the first high-voltage power supply unit and the second high-voltage power supply unit are galvanically separated both from a mains connection and from one another, and
• the first current sensor is arranged in a return line which leads from the terminal to the first high-voltage power supply unit, and
• wherein the second high-voltage power supply unit comprises a second current sensor, the second current sensor configured to measure a collector current flowing through the collector stage in a return line leading from the terminal to the second high-voltage power supply unit.