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 being configured to irradiate a sample with primary X-rays;
• a detector that detects secondary X-rays generated from the sample;
• and
• a power supply that applies a tube voltage to the target, wherein
• the power supply includes
• a transformer,
• a switching circuit connected to a primary side of the transformer, and
• a substrate to which the switching circuit and the transformer are connected, the substrate including a first layer and a second layer,
• the transformer includes a first primary winding and a second primary winding on the primary side,
• a first wiring pattern that connects the first primary winding and the switching circuit to each other is located in the first layer,
• a second wiring pattern that connects the second primary winding and the switching circuit to each other is located in the second layer, and
• the first layer and the second layer are arranged such that at least a part of the first wiring pattern overlaps with the second wiring pattern when the substrate is viewed from a stacked direction in a plan view.