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To investigate the input impedance of digital-controlled bi-directional DC/DC converters, this paper develops a modeling method based on the sampled-data approach. Because the nonlinear pulse-width modulator generates sideband components, the sideband effect occurs in a closed-loop converter. And the sampling process of a digital controlled system can significantly influence the sideband components...
In AC/DC hybrid grid, the individual AC and DC grids exist. The power converters are the key interfaces between these two kinds of individual grids. Under unbalance AC grid, the grid voltage is distorted and the harmonics is involved. Therefore, the active power and reactive power also give rise to the uncontrolled oscillations, which will damage the interface converters. In order to ensure the safety...
This paper presents a research of full digital-controlled AC/DC converter, which consists of single Boost PFC and LLC resonant DC/DC converter. The whole control system structure is proposed to integrate all analog control functions. By digital control, it can reduce the system's volume and costs, improve characteristics. As a proof of this design, an example of 240W AC/DC converter is given. The...
This paper analyzes the error of digital control PFC system in the presence of digital signal processing, the control loop of PI, PID controller is equivalent to IIR digital filter, the mathematical statistics of errors by the control loop is calculated and the transfer model of noise in the system is gave. these works for the digital control PFC system to choose the right processor and reduce the...
The dead-time effect of driving signal and the lagging effect of digital control have serious implications for the static and dynamic performance of the inverter distortion voltage, the paper makes a research on static and dynamic performance of diode clamp three-level single phase inverter. The paper regards dead-time effect and lagging effect as a periodic disturbance and proposes a lagging improved...
This paper analyzes the necessity of establishing the dc bus voltage of the Dual Active Bridge (Dual Active Bridge, DAB) converter when starting up. And the startup method that the DC-bus voltage is built up only by high-voltage-side body diode of the DAB converter rectifying is proposed in the paper. The detailed steps and the software realization method are elaborated. The saturation phenomenon...
This paper introduces a digital multi-mode boost converter with wide range of input voltage for an energy recycling load system. The boost converter is controlled digitally with constant off- time/constant frequency hybrid pulse width modulation (PWM) control. Constant off-time control is to avoid the limit cycle oscillation and gain a high gain when the input voltage is far less than the output voltage...
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