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Envelope Tracking (ET) Technique can remarkably improve the efficiency of the power amplifier (PA) in the modern Mobile Communication Base Station. Switch-Linear Hybrid (SLH) ET power supply has become the mainstream structure, which gives consideration to high efficiency and high bandwidth. However, the SLH ET power supply with single switching converter suffers a low efficiency as increasing the...
This paper presents an isolated power supply unit for high-side gate driver. It generates a bipolar voltage level (+15V/-5V) and an auxiliary voltage level of +5V. The LLC topology is used at fixed frequency of 5MHz. A voltage control based on switched resonant tank is used to compensate voltage drops in the converter at high load currents. This new control strategy allows using a simple feedback...
Envelope tracking (ET) applications demand high tracking bandwidth and high efficiency using a DC-DC converter. Design based on small-signal models using fixed frequency digital pulse width modulator (DPWM) often results in limited closed-loop bandwidth. This paper proposes a mixed-signal hysteresis current control (MSHCC) in a DC-DC buck converter with an analog current-loop and a digital voltage...
In this paper, a LCC series-parallel resonant converter is designed for the electromagnetic launch system, in which, the power supply charges for the energy-storage capacitor in the Pulse Forming Unit. At first, the operational principles of the LCC resonant topology operating in Discontinuous-Current-Mode are analized and the detailed expressions describing the resonant topology are derived. In order...
There is a need for more flexible and reconfigurable dc-dc converters. This has pushed designers to seek for alternative ways to control the PWM modulated switch inside the dc-dc converter. This paper presents the results of design and implementation of a fully customizable Arduino based controller for a SMPS (buck converter). The controller presented gives the user a high degree of autonomy and permits...
A digitally controlled programmable switch mode synchronous step down DC-DC power supply for a vaporizer used in a spectrometric instrumentation analyzer is designed taking into consideration the delays caused by the analog to digital converter, digital to analog converter and the discretization process of the control coefficients. The control method used is average current mode control. Because the...
This paper presents a new topology based on the series resonant converter (SRC) for high-voltage application. The proposed topology consists of two series resonant tanks. Each series resonant tank is built up by connecting a tank capacitor in series to a high-voltage transformer with the leakage inductance of the high-voltage transformer is absorbed as resonant inductor. Therefore, two high-voltage...
Due to total harmonic distortion and the time delay of the digital controller in the condition of a single-phase 400 Hz power supply, the traditional proportional-integral-differential controller cannot track the sinusoidal waveforms with zero static error. To improve the performance, the deadbeat control and the proportional-resonant control have been analyzed and contrasted in this paper. The results...
This paper depicts a bipolar switching power supply designed for generating AC, DC, and other user-defined specific waveforms. The bipolar power supply is composed of a remote control board and a power supply module. The power supply module consists of a digital signal processor, an intelligent power module and an LC filter. A twisted-pair wire of CAN bus connects the remote control board and the...
This paper presents a method to improve light load efficiency and reduce the THD of input current of a boost PFC converter used in applications to high performance server power supply units. The conventional constant frequency average current mode control scheme will result lower efficiency and high THD current distortion under light load operation. To overcome this problem, this paper proposes a...
This paper presents the use of a digitally tuned resonant capacitance control with narrow range frequency modulation to regulate the output voltage of a zero current switching series resonant (ZCS-SR) inverter-fed transformer-linked DC-DC converter for X-ray power supply application. In this control scheme, the series resonant inverter consists of several capacitors which are switched into and out...
DC-DC converters are employed in various electrical devices, thus forming main sources of electromagnetic interference (EMI). By making the DC-DC converter operating in chaos, using a new nonlinear feedback controller, the simulation results illustrate that a reduction of spectral peak and consequent spreading of the spectrum can be shown. This simple strategy not only improves the electromagnetic...
This paper presents a new low-cost digital control solution that maximizes the AC/DC flyback power supply efficiency. This intelligent digital approach achieves the combined benefits of high performance, low cost and high reliability in a single controller. It introduces unique multiple PWM and PFM operational modes adaptively based on the power supply load changes. While the multi-mode PWM/PFM control...
Design of DC power supply using half bridge LCC series-parallel resonant converter is proposed in this paper. The DC power supply input voltage is DC 24 V and output voltage is DC 3.3 V. The voltage regulation using variable frequency control is investigated for 3.3 V under different load condition. The performance of the system is first simulated by IsSpice. A 16-bit digital signal processor (DSP...
In Magnetic Resonance Imaging system, the most powerful device is gradient driver, which is also one of the key components to realize fast imaging with high quality. To meet the requirements of high-end MRI products, the power rating of the gradient driver increase from several hundred-kVA to 1 MVA and even higher in the future. Commonly the gradient driver applies full bridge cascade technology and...
In recent two decades the application of high voltage test systems using the concept of very low frequency is more and more accepted by industries. This contribution deals with the control design for a novel high voltage test system generating a true sinus test voltage of 85 kV (RMS) at 0.1 Hz based on a zero-voltage switched LCC-resonant converter and a 3-stage Cockcroft Walton voltage multiplier...
To decrease the power consumption of a switching power supply, the most effective approach is to lower the switching frequency. Hence, the current mode pulse-width-modulation (PWM) controller used in a switching regulator must be capable of frequency modulation at light-load condition. The green mode circuit is designed in proposed current mode PWM control IC with the concept of off-time modulation...
A 100 MHz switching power supply with two-loop control is proposed for radio frequency power amplifiers. The power supply has a tracking bandwidth of 5 MHz and an estimated efficiency of 80%. The two-loop topology consists of a buck converter with an inner loop for one-cycle control and an outer loop that contains a PI compensator. With the two loops a stable feedback control is obtained with an excellent...
Switching mode supplies usually emit electromagnetic interferences (EMI) at switching frequency and its harmonics. EMI can be reduced by making these systems worked on chaotic state, but this may induce higher output voltage ripple. Based on a new voltage feedback method, buck converter can display complex nonlinear behaviour. Compared with periodic state, power spectrum of inductance current is improved...
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