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Phase-difference-synchronization-controlling-circuit-of-parallel-switching-mode-power-supply

Simultaneous capacitive open-circuit testing

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AND PREFERRED EMBODIMENTS Turning now to the drawing, attention is specifically directed to FIG. 1 ...

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Phase-difference synchronization controlling circuit of parallel switching mode power supply

Details

Inventors: Choi, Seung;
Assignee: SamSung Electronics Co., Ltd. (Suwon, KR)
Primary Examiner: Stephan; Steven L.
Assistant Examiner: Nguyen; Matthew
Attorney, Agent or Firm: Bushnell; Robert E.

A power circuit of SMPS (Switching Mode Power Supply) is disclosed. Particularly, a phase-difference synchronization controlling circuit of a power circuit for operating in parallel two or more SMPSs is disclosed. The phase-difference synchronization controlling circuit comprises a first PWM controller, a second PWM controller, phase-difference synchronization controlling means connected between an output terminal of the first PWM controller and an output control terminal of the second PWM controller, first and second transformers whose one-sided ends of respective primary windings are connected to a supply voltage Vdc, and first and second switching transistors and coupled between the first and second transformers and a ground. By the above constitution, the output phases of two power circuits are synchronized, and at the same time, PWM pulses are alternatively outputted with a phase difference of 180.degree., so that two power supplies can be operated in parallel with DC power source supplied from a power source supplier of small capacity.

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a power supply in which operation of two power supplies is done with a phase difference of 180.
degree.
when the two power supplies are operated in parallel.
It is another object of the present invention to provide a circuit controlled by the output of one power supply between two power supplies, thereby controlling the two power supplies alternatively operated.

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