A Four-Channel Secondary Power Supply Development Based on the 5315EU015 PWM Controller

Uninterruptible Power Supply (UPS) is provided between a primary power source and the input of the equipment to be protected, to eliminate the effects of a temporary power failure and power quality. To extend voltage adjustability, the proposed UPS with Switched Inductor Z-Source Inverter (SLZSI) employs a unique Switched Inductor(SL) impedance network to couple the inverter circuit and the power source. The proposed SLZSI fed UPS has the voltage boost capability through the shoot through zero state which is not available in traditional UPS system with step-up transformer, boost chopper. A very short shoot-through zero state is required to obtain high voltage boost, so the output voltage and current waveform distortions are reduced. The voltage stress of the proposed UPS with SLZSI is also minimized. The three Pulse Width Modulation (PWM) control techniques like Simple Boost (SB) PWM control, Maximum Boost (MB) PWM control and Third Harmonic Injected Maximum Constant Boost (THIMCB) PWM control are implemented and the results are compared for the performance analysis of three-phase UPS systems with SLZSI. Experimental setup has been developed for the proposed UPS with SLZSI by implementing THIMCB PWM control algorithm and measurements were taken to validate the theoretical and simulation results.

Control of a pneumatic actuator using pulse width modulation (control) represents a good alternative for control of pneumatic actuator that uses proportional valve. Important advantage of pulse width modulation control is fewer consumption of compressed air. In addition, air consumption can be further reduced by the use of inter-chamber cross flow (chamber by-passing). This article discusses joint application of pulse width modulation and by-pass chamber control on the example of pneumatic rodless cylinder which is controlled by programmable logic controller. Saving of compressed air was experimentally determined, as well as the influence of inter-chamber cross flow on the quality of the control. With this application of pulse width modulation and by-pass valve control, pneumatic actuator system shows that 30% of energy can be saved under the same working conditions in comparison to the traditional pulse width modulation control system.

A novel CMOS integrated pulse-width modulation (PWM) control circuit allowing smooth transitions between conversion modes in full-bridge based bi-directional DC–DC converters operating at high switching frequencies is presented. The novel PWM control circuit is able to drive full-bridge based DC–DC converters performing step-down (i.e. buck) and step-up (i.e. boost) voltage conversion in both directions, thus allowing charging and discharging of the batteries in mobile systems. It provides smooth transitions between buck, buck-boost and boost modes. Additionally, the novel PWM control loop circuit uses a symmetrical triangular carrier, which overcomes the necessity of using an output phasing circuit previously required in PWM controllers based on sawtooth oscillators. The novel PWM control also enables to build bi-directional DC–DC converters operating at high switching frequencies (i.e. up to 10 MHz and above). Finally, the proposed PWM control circuit also allows the use of an average lossless inductor-current sensor for sensing the average load current even at very high switching frequencies. In this article, the proposed PWM control circuit is modelled and the integrated CMOS schematic is given. The corresponding theory is analysed and presented in detail. The circuit simulations realised in the Cadence Spectre software with a commercially available 0.18 µm mixed-signal CMOS technology from UMC are shown. The PWM control circuit was implemented in a monolithic integrated bi-directional CMOS DC–DC converter ASIC prototype. The fabricated prototype was tested experimentally and has shown performances in accordance with the theory.

Implementation and performance analysis of combined SOD and PWM control in diode based laser beam machining process on leather specimen

Development of a PWM Precision Spraying Controller for Unmanned Aerial Vehicles

This paper aims to compare the switching capabilities of the three most cited Pulse Width Modulation (PWM) control techniques in the application of three-phase Z-Source Inverters (ZSI). The Simple, Constant and Maximum Boost PWM control techniques are mathematically designed and applied to a 2 k-W ZSI and the critical performance metrics of the inverter, viz. the boost factor (B), voltage stress ratio across the switching components (Vstress) and the percentage of total harmonic distortion (%THD), are analyzed and compared for each of PWM control techniques. The Maximum boost control technique yield the highest boost factor however at a cost of increased %THD in the output power signals. The simple Boost PWM control incurs the highest Vstress across the switching components. The constant boost control is intermediate while the simple and maximum boost controls are the extremes for all three performance metrics. It is best to understand the performance characteristics associated with each PWM control technique to make an appropriate selection of the best-suited PWM control scheme for a particular application.

A high-performance pulse width modulation (PWM) controller with adjustable current limit technique, which is suitable for peak-current-mode (PCM) DC-DC converters, especially in high-power application, is proposed in this paper to guarantee converters work properly. In order to realize high-performance analog circuit with smaller size in high-power application, a novel control method with concept of relative ground is introduced in the proposed PWM controller. Besides, compared with conventional PCM DC-DC converters, the change of peak current limit with the change of duty cycle is greatly decreased through a special strategy. The proposed high-performance PWM controller has been validated with 0.6-µm CD process based on a monolithic current-mode BUCK converter capable of driving up to 3A loads with supply voltage from 4.5 to 23V. Simulation results demonstrate that the proposed PWM controller can guarantee the BUCK converter operating properly.

Los controladores de carga son implementados en varios sistemas electrónicos con el objetivo de proteger y controlar la carga y descarga de una batería; en el caso de los controladores utilizados en sistemas fotovoltaicos autónomos se implementan dos tipos de tecnologías, Pulse Width Modulation (PWM) y Maximum Power Point Tracking (MPPT). En este artículo se compararon dos controladores de carga con diseños originales en sistemas fotovoltaicos con las mismas especificaciones técnicas para determinar el comportamiento de cada uno bajo condiciones ambientales similares. La implementación de ambos controladores de carga se basó en software y hardware con diseños originales, utilizando tecnología PWM y MPPT. Ambos sistemas están compuestos por el controlador de carga, un panel solar de 30 W y una batería de 12 V a 18 Ah; se realizaron las pruebas experimentales de ambos controladores midiendo voltaje y corriente en el panel y en la batería en procesos de carga y descarga, observando que el controlador MPPT tiene una eficiencia promedio mayor que el controlador PWM debido a que el tipo de tecnología implementada influye directamente en la eficiencia, incluso ante valores menos favorables de radiación solar y temperatura ambiente. El controlador PWM es una opción de eficiencia aceptable y además de bajo costo respecto al controlador MPPT. En la implementación de ambos controladores se calcularon tiempos de autonomía similares.

Equivalent space heat sink for nano-satellite(ESHS-nS) is a space environment simulator applicable to dynamic characteristic ground-testing research of nano-satellite thermal system.In detail the operation principle of ESHS-nS is described,and for the core components thermoelectric cooler(TEC) and force cooling fan,the pulse width modulation(PWM) control strategy and the hardware implementation are proposed.Then,as a platform for a nano-satellite simulator,the ESHS-nS is utilized to carry out ground-testing research on closed-loop temperature control strategy.The results show that ESHS-nS with PWM control can satisfy the requirement of experiment research on nano-satellite temperature control in ground environment,and the ESHS-nS provides a new technical approach for space environment simulation experiment of micro spacecraft thermal systems.

In this paper, a pulse width modulation (PWM) control approach to speed trackong control is developed for the three-phase induction motor in electric vehicles.The PWM technique is amployed to design controllers.By incorporating the three-phase bridge recifier into the motor based on the PWM technique ,the PWM control approach is developed.The proposed control method is able to overcome the disadvatage of the motor in the traditional design procedure.In addition,it is proved that the tracking error converges to a small neighborhood of the all origin and all the closed-loop signals are bounded.The results of the MATLAB simulation illustrate the effectiveness of the proposed approach.

Computer-aided design (CAD) techniques are presented which address the general problem of including complex pulse-width modulated (PWM) control strategies into power-electronic system simulations, using circuit-analysis CAD packages. Circuit-equivalent PWM techniques which allow any of the currently available PWM control strategies-natural-sampled, regularly-sampled, harmonic elimination, and optimized PWM-to be implemented in circuit-analysis CAD packages are presented. This CAD package allows complex open-loop and closed-loop PWM control schemes to be simulated for virtually any practical power-electronic system, including uninterruptible power supplies, static frequency changers, and variable-speed drives. Power-electronic system simulation examples and results are presented which demonstrate the ease of simulation using the PWM CAD package, together with comparative experimental results obtained from a microprocessor-controlled PWM inverter system. >

In this paper, a new pulse width modulation (PWM) control method for the isolated current-mode resonant converter with a fixed switching frequency is presented. The circuit topology is the same as a conventional resonant converter with synchronous rectification and without any additional components. The control technique for the output voltage regulation is proposed with the unique PWM control for synchronously-rectifying switches. By using the transformer's leakage inductance and the PWM control, the boost conversion can be realized. Also, the zero-voltage switching (ZVS) operation can be done for primary switches, simultaneously. Some experiments have been done with 5MHz isolated DC-DC converter which has Gallium Nitride field effect transistor (GaN-FET).

This research focuses on the performance analysis of an AC Voltage Controller (ACVC) utilizing various control techniques—specifically firing angle control and Pulse Width Modulation (PWM) control for different load conditions. The AC Voltage Controller is a power electronic device that regulates AC voltage magnitude without altering its frequency. Simulation models were developed using MATLAB/Simulink for resistive, inductive and single-phase induction motor loads under both firing angle and PWM control techniques. The results highlight that PWM control significantly reduces Total Harmonic Distortion (THD) and improves power factor compared to conventional firing angle control, thereby ensuring enhanced performance and efficiency.

The design of a pure sine wave inverter based on the EGS003 aims to improve the efficiency of electrical energy conversion. This inverter development method integrates PWM (Pulse Width Modulation) control with a pure sine wave reference signal. The use of PWM control allows precise adjustment of the pulse width of the output signal, according to the desired sine wave characteristics. Consequently, this inverter is capable of producing pure sine waves without significant harmonic distortion, enhancing the quality of the generated power and reducing energy losses due to harmonic distortion. This research involves the implementation of EGS003 technology, which is a dedicated PWM controller designed for inverter applications. The use of this controller enables the optimization of resource utilization and enhances energy conversion efficiency. Furthermore, the development of the EGS003-based inverter involves the analysis and design of control circuits in line with modern power electronics principles. This includes adjusting PWM control parameters to various load characteristics, allowing the inverter to operate optimally under different usage conditions. The design results demonstrate that the pure sine wave inverter based on EGS003 provides satisfactory performance in delivering output compliant with power quality standards. With the capability to generate pure sine waves without significant harmonic distortion, this inverter has broad application potential in power systems requiring high-quality power. Additionally, the use of PWM control technology in this inverter facilitates ease of operation adjustment and monitoring, enhancing the overall reliability and efficiency of the system.

In this paper, a new model for pulsewidth modulation (PWM) control systems is proposed and a PWM controller based on the model is designed by using the VSS-type self tuning control method. The duration of pulse signal of the PWM control input in each sampling period is considered as a new control input of the model. The resulted model is a nonlinear system although it can be linearized when the duration is small enough. To compare with, controllers with the minimum variance control method and the self tuning control method are also designed. Simulation results for a DC motor PWM control system show that the designed PWM control systems with the proposed model are with satisfactory control performance.