HIGH VOLTAGE TRANSFORMER WITH OVER VOLTAGE PROTECTION, AND METHOD FOR OVER VOLTAGE PROTECTION

摘要

The present invention relates to a high voltage transformer (e.g. for CRT display units) with an over voltage protection (OVP), comprising a primary, low voltage winding, a secondary, high voltage winding, and an over protection circuit, arranged to cut off the transformer when the voltage in an auxiliary winding exceeds a predefined level. According to the invention the auxiliary winding is coupled to the secondary winding and isolated from the secondary winding by at least one layer of insulating foil. The invention improves the load variation of the relationship between the voltage on the secondary side and the voltage in the auxiliary winding, reducing it to less than 1 kV over the normal load range.