X-ray fluorescence spectrometer and power supply apparatus

An X-ray fluorescence spectrometer comprising:

• an X-ray tube including a filament and a target, the X-ray tube irradiating a sample with primary X-rays;
• a detector that detects secondary X-rays generated from the sample;
• a first power supply that applies a tube voltage to the target;
• a second power supply that supplies a filament current to the filament,
• the first power supply including
• a transformer, and
• a switching circuit connected to a primary side of the transformer;
• a current detection circuit connected to the primary side of the transformer to detect a current that flows to the primary side of the transformer;
• and
• a control circuit that controls the first power supply based on the current detected by the current detection circuit, wherein
• the current detection circuit includes a first comparator configured to detect whether the current detected by the current detection circuit is equal to or larger than a first threshold value, and
• the control circuit detects occurrence of electric discharge based on detection of the current equal to or larger than the first threshold value by the current detection circuit.