Transformers and switching power supply units
A technology of switching power supply and transformer, which is applied in the parts of transformer/inductor, transformer/inductor coil/winding/connection, circuit, etc. It can solve the problem of unstable output voltage and achieve the effect of reducing cross-regulation
Active Publication Date: 2020-04-03
TAMURA KK
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- Application Information
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Problems solved by technology
That is, when the current flowing through the load connected to one of the secondary windings changes, the output voltage of the other secondary windings that should have nothing to do with the load change will fluctuate, and the output voltage will become unstable.
Method used
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no. 2 Embodiment approach
[0052] [2-1. Structure]
[0053] use Figure 4 ~ Figure 11 A second embodiment will be described. The basic configuration of the second embodiment is the same as that of the first embodiment. Therefore, only the differences from the first embodiment will be described, and the same reference numerals will be assigned to the same parts as in the first embodiment, and detailed description will be omitted.
[0054] Figure 4 It is a schematic sectional view showing the overall structure of the transformer of the second embodiment. Figure 5 It is a circuit diagram of a switching power supply device using the transformer T of the second embodiment. The difference from the first embodiment is that two or more (here, two) auxiliary windings 14 and 16 are provided.
[0055] That is, the difference lies in that the auxiliary windings 14 and 16 are respectively provided adjacent to the secondary windings 12 and 13 in the winding axis direction of the respective windings 11 to 13 , ...
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The invention provides a transformer and a switch power supply device. The transformer can also reduce cross regulation in the case that a load is unbalanced. The switch power supply device uses the transformer. The transformer (T) is provided with a magnetic core (10), a primary winding (11) assembled on the magnetic core (10), more than two secondary windings (12, 13) assembled on the magnetic core (10) in a manner that reels are the same as a reel of the primary winding (11), and more than two auxiliary windings (14, 16) assembled on the magnetic core (10) in a manner that reels are the same as the reel of the primary winding (11). The auxiliary windings (14, 16) are disposed in a manner that the auxiliary windings (14, 16) are respectively adjacent to the secondary windings (12, 13), and the auxiliary windings (14, 16) are mutually connected in parallel. The switch power supply device is provdied with the transformer (T), a switch element connected with the primary winding (11) of the transformer (T), and a control circuit controlling the switch element.
Description
technical field [0001] The present invention relates to a transformer and a switching power supply device using the transformer, in particular to the structure of the transformer. Background technique [0002] In order to operate electric equipment and circuits, a stable DC voltage is required, and a switching power supply device has conventionally been used to generate this DC voltage. A switching power supply device rectifies and smoothes the voltage supplied from an external power supply, performs switching operations through a semiconductor switching element, inputs it to the primary winding of a transformer, and supplies a DC voltage from the secondary winding of the transformer to the load through smoothing by a smoothing circuit. Then, the output voltage is monitored, and the timing of the semiconductor switching element is adjusted by the control circuit so that the output voltage is kept constant. [0003] Among such switching power supply devices, conventionally k...
Claims
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IPC IPC(8): H02M3/28H01F27/30H01F3/14
CPCH01F3/14H01F27/306H02M3/28
Inventor 小川纮生
Owner TAMURA KK