Series and parallel transformer resonant DC–DC converter using optimal digital servo and repetitive learning control schemes

A dual-mode phase-shift modulation control scheme for voltage multiplier based X-ray power supply

“…There are numerous applications of dc high voltage power supplies such as lasers, accelerators, ultra-high voltage electron microscopes and x-ray power generators. However the designing of dc high voltage X-ray power supply especially for medical imaging application is most complicated [1][2][3][4][5][6]. In medical imaging, an X-ray generator is required to properly control the X-ray penetration power and intensity of radiation, so that the contrast brightness and resolution of X-ray images are good enough for medical diagnosis.…”

“…In medical imaging, an X-ray generator is required to properly control the X-ray penetration power and intensity of radiation, so that the contrast brightness and resolution of X-ray images are good enough for medical diagnosis. The quality of an X-ray image is primarily determined by the X-ray radiated energy, which is proportional to the high voltage applied across the X-ray tube [1][2][3][4][5][6]. The contrast of X-ray image is sensitive to the tube voltage ripple and therefore to achieve good quality image, the X-ray high voltage generator has to have low output voltage ripple.…”

“…The X-ray dose and the photographic density of X-ray image varies in proportion to the exposure time multiplied by the tube current. Short exposure time which is less than a few milliseconds is widely used for the diagnosis of moving organs, such as blood vessels and heart [1][2][3][4][5][6]. Therefore, relatively lower tube voltage and higher tube currents are required under shorter exposure time condition in order to obtain desirable photographic density, sufficient contrast and sharpness of X-ray images for medical diagnosis.…”

Optimal PWM Control of Switched-Capacitor DC–DC Power Converters via Model Transformation and Enhancing Control Techniques

“…There are some existing methods for minimizing the output ripple magnitude of a switched-capacitor DC/DC power converter, such as multirate control method [16], LQR control methods [17]- [19], intelligent control method [20], and PWM control methods [21]- [25], etc. On the other side, some methods have been proposed for regulating the output load voltage, such as PWM control method [32], noise shaping method [33], pseudo-continuous control method [34], interleaved discharging method [35], and constant frequency charge pump method [36], etc.…”

Odd-Harmonic Digital Repetitive Control of a Single-Phase Current Active Filter

“…2004.830045 uses the repetitive control technique to design a high-gain digital control current loop for a single-phase shunt active filter. The concept of repetitive control has been largely used in different control areas such as CD and hard disk arm actuators [9]- [11], robotics [12], [13], machining [14], electro-hydraulics [15], torque vibration suppression in motor control [16], [17], power electronic converters [18], unity power factor rectifiers [19], pulse-width modulated (PWM) inverters [20]- [24] and uninterruptible power supply (UPS) systems [25], [26].…”