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The purpose of this paper is to present a design of digital hysteresis current control circuit in ac-dc converter for wind power generation. The control circuit utilizes a digital signal processor and an analog reactor current detector using an RC integrator. In the proposed method, the design of time constant of RC integrator is important to determine the operation range of duty ratio. The design...
In this paper, a new digital hysteresis current control for ac-dc converters is presented. The new control circuit has the peak and valley current detectors which are comprised of an RC integrator, comparator and R-S flip-flop. These current detectors can detect the peak and valley reactor currents in real time. The proposed control circuit structure and the operation principle are explained with...
This paper studies a new digital hysteresis current control to provide high stability power converters. Although the output voltage is sensed by an A-D converter to calculate the digital feedback value, the reactor current is detected by peak and valley current detectors which consist of some analog circuit components. Therefore, the proposed method realizes the real time detection of reactor current...
This paper presents the parameter design of the integral gain switchover function for the digital control dc-dc converter and its transient response in the DCM. The proposed gain switchover function utilizes the load current to determine the integral gain because the output current is detected in the dc-dc converters for the ICT system. The proposed method uses the hysteresis function around the critical...
The purpose of this paper is to present a new integral coefficient change method that is not required the load current detection. The integral coefficient is changed based on the on-time of main switch. It uses two kinds of hysteresis function for stable operation around the boundary point of continuous conduction mode and discontinuous conduction mode. One uses the shape of rectangular And another...
The purpose of this paper is to presents a new integral gain switchover method that has the unique hysteresis function in which the current sensor circuit is not required. In this paper, two kind of integral gain switchover method is indicated. One is te two-step switchover method having the rectangle hysteresis function. The other is slope switchover method having rectangular triangle hysteresis...
The purpose of this paper is to present a new dc-dc converter using the digital integral gain switchover function and its control characteristics. The integral coefficient is switched by a reactor current. The reactor current is detected using two high-speed A-D converters. Then the sloop of reactor current is calculated. The integral coefficient is changed to appropriate value based on the calculated...
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