04456950 is referenced by 7 patents and cites 5 patents.

A circuit which prevents the flow of excess spikes of magnetization current in the primary windings of a transformer used in a switch mode power supply is disclosed. The circuit comprises an AC coupled, peak detecting, negative feedback path from a current sensing resistor in the primary windings of the transformer to the input of the voltage regulator so that as excess primary winding current spikes begins to flow the driving switches on the transformer primary are rapidly turned off thereby preventing any further rise in transformer primary current.

Title
Current spike protection circuit for switch-mode power supplies
Application Number
6/387054
Publication Number
4456950
Application Date
June 10, 1982
Publication Date
June 26, 1984
Inventor
Clifford B Cordy Jr
Corvallis
OR, US
Agent
Roland I Griffin
Jeffery B Fromm
Assignee
Hewlett Packard Company
CA, US
IPC
H02P 13/22
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