Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-07-13
2000-09-05
Riley, Shawn
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
H02M 3335
Patent
active
061152668
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a switching power source arrangement. More particularly, the present invention relates to a switching power source arrangement including a switching circuit for switching input electric power to produce an output of a pulsating wave form, the pulsating output produced by the switching circuit being then converted into a DC output, the DC output being monitored by a control circuit which is adapted to control the switching circuit so that a substantially constant DC output voltage is maintained. More specifically, the present invention pertains to a switching power source arrangement having such control circuit comprising a digital circuit.
BACKGROUND OF THE INVENTION
In conventional switching power source arrangement, it has been common to provide such control circuit with an analogue circuit. In this instance, the output voltage and the output current are detected in terms of analogue signals which are processed in the form of analogue values, the results of the processing being used to produce control signals for controlling the switching operation.
In general, in switching power sources, operating modes of power converter circuit may be changed in accordance with changes in input voltage or load current. In this instance, it is required that a plurality of control algorithms be provided for the respective ones of the control modes, which are appropriately selected to accomplish the most appropriate control. It should however be noted that the conventional switching power source including such analogue control circuit is designed to perform a signal processing in the control circuit mostly based on a hardware circuit structure so that control circuits or hardware structures have to be provided in advance for the respective ones of the control algorithms so that they can be selectively used in accordance with the operating modes in order to accomplish the most appropriate control through a selection of a control algorithms in accordance with a change in the operating mode in the power converter circuit. This will mean that a plurality of hardware control circuits have to be provided. The structure is therefore complicated in circuit construction so that it is practically unsatisfactory.
In a conventional switching power source having an LC filter and diode for eliminating ripple, there are produced two different operating modes, one being a continuous mode and the other a discontinuous mode, which are produced depending on the value of the load current. It is common in a conventional switching power source utilizing an analogue control circuit to use, even under an operating condition wherein the inductor current is discontinuous, methods or sequences of signal processing which are designed with control models under conditions wherein the inductor current is continuous. This is because the fact that it is difficult or make the structure complicated and uneconomical to change the methods or the sequences of signal processing depending on the load condition. Therefore, the control models are inappropriate under an operating condition where the inductor current is discontinuous so that unsatisfactory conditions are produced in respect of stabilities in the output voltage and the control systems.
A resonance type power source has been developed primarily for decreasing the switching loss in the switching power source arrangement. However, this technology is still in the process of development so that there is no available unified circuit system. Thus, there is no unified control algorithms in this type of power source for the respective circuit systems and different control circuits are provided for different circuit systems. Thus, there are serious problems in an effort to provide a standardized control circuit comprising a control IC.
A non-resonance type circuit system generally has a plurality of operating modes. Therefore, in order to provide a stabilizing control through an analogue circuit system, it is required to provide a plurality of contr
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"Digital Control of DC/DC Converter", by Isao Fujiwara et al, Technical Report of IEICE PE94-2 (May 1994), pp. 9-16; English language Abstract on p. 9.
"The Influence of Optimal Programmed Pulse Width Modulation on the Static and Dynamic Output Behaviour of a Digital Controlled DC/DC-Converter", S. Huth, EPE '95:6th European Conference on Power Electronics and Applications, pp. 1.758-1.763, Sep. 19-21, 1995.
Maeyama Shigetaka
Matsui Nobuyuki
Miura Koichiro
Takeshita Takaharu
Riley Shawn
TDK Corporation
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