Switched mode power supply

Details Switched mode power supply Switched mode power supply

2000-09-29

2001-08-28

Berhane, Adolf Deneke (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S021120

Reexamination Certificate

active

06282110

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a switched mode power supply, and more particularly to a switched mode power supply that can effectively detect and monitor the power supply to electrical appliances and terminate the power supply if any abnormal overpower phenomenon occurs.
DESCRIPTION OF RELATED ART
It is known that the peripheral equipment of a computer, such as a printer or a scanner, generally utilizes a DC motor as a driving unit. For such a DC motor, a large peak current may be required upon activating the motor. The peak current generally is 1.5-5 times a normal operation current. To meet the requirement of the peak current, a power supply to the peripheral equipment needs to be designed with a tolerance of maximum peak current. Obviously, such design may cause a high cost and increased volume of the power supply. Another significant disadvantage is that the existing power supply may become dangerous to the user if there is any abnormal output power occurring due to the large peak current.
To solve this problem, it is necessary to provide an improved power supply which can monitor the transient output power and prevent any danger caused by any abnormal power.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, a switched mode power supply having a main transformer, a power circuit, a power transistor, a wave width modulator, and an output transfer circuit, comprises a detecting and processing unit connected between an output end of the switched mode power supply and the wave width modulator for detecting an output power of the switched mode power supply. The detecting and processing unit includes an overpower detecting circuit for determining whether the output power of the switched mode power supply exceeds a set value, and a timing circuit for determining whether the duration of overpower phenomenon exceeds a set time period and switching off the wave width modulator if the set time period is indeed exceeded.
In accordance with another aspect of the present invention, the detecting and processing unit is connected to an output end of the switched mode power supply via an isolated circuit.
In accordance with a further aspect of the present invention, the detecting and processing unit is composed of an integrated circuit with a function of processing.


REFERENCES:
patent: 5412556 (1995-05-01), Marinus
patent: 5671131 (1997-09-01), Brown
patent: 6134123 (2000-10-01), Yamada

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