| 摘要 |
PROBLEM TO BE SOLVED: To eliminate dispersion of inductance due to variance between windings when two multilayer board-based transformers equal to each other in configuration are connected in series. SOLUTION: A winding board 3 has a constitution in which two winding boards are integrated with each other, and this prevents the occurrence of dispersion of inductance due to variance between the windings. Since the winding board 3 is constituted by including windings L1 and L2, a process is not required of routing the windings L1 and L2 via lead terminals to an electronic component mounting substrate 20 for dispensing with connection via a pattern on the electronic component mount substrate 20. Further, the configuration eliminates the need of providing a pattern on the electronic component mounting substrate 20 for connection of electronic components such as a surge absorber. As the result, the pattern to be provided on the electronic part mounting substrate 20 can greatly be shortened. COPYRIGHT: (C)2004,JPO
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