Title:
METHOD AND DEVICE FOR FIXED-VOLTAGE OUTPUT CONTROL IN SWITCHING POWER CIRCUIT
Document Type and Number:
Japanese Patent JP3708529
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a device for fixed-voltage output control in switching power circuit capable of constant-voltage control of output voltage with high accuracy even if there is variety in a circuit element or an integrated circuit to be used.
SOLUTION: With the output voltage of a secondary output winding 2b subjected to the constant-voltage control as V2bset, the number of turns of a primary winding 2a as Np, and the number of turns of a secondary output winding 2b as Ns, a setting voltage V2aset which is found from formula 1 is compared with a flyback voltage V2a of the primary winding 2a. If the flyback voltage V2a is above the setting voltage V2aset, the ON time T1 of a switching element 3 for oscillation is controlled so as to be shorter in accordance with its differential voltage dV. If the flyback voltage V2a is below the setting voltage V2aset, the ON time T1 of the switching element 3 for oscillation is controlled so as to be longer in accordance with its differential voltage dV.
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Inventors:
Amai Toshihiro
Application Number:
JP2003074368A
Publication Date:
October 19, 2005
Filing Date:
March 18, 2003
Export Citation:
Assignee:
SMK Corporation
International Classes:
H02M3/28; H02M3/335; (IPC1-7): H02M3/28
Domestic Patent References:
| JP2003033021A | ||||
| JP2002136116A | ||||
| JP2001231257A | ||||
| JP11225473A | ||||
| JP5043791U |
Attorney, Agent or Firm:
Osamu Hayasaki
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