Abstrak
 Sistem kontrol banyak diterapkan pada bidang pertanian seperti penggunaan mikrokontroler dalam mengontrol dan memantau kondisi kelembaban udara greenhouse. Ketepatan pengkondisian merupakan hal penting bagi pertumbuhan perkembangan tanaman microgreen. Kelembaban media tanam secara tidak langsung mempengaruhi melalui penguapan, sehingga diperlukan sistem yang dapat sekaligus tanam....

High current qualities and high efficiencies are always two important characteristics for power converters. However, it is challenging to achieve the targets simultaneously. In this paper, dead-time-effect elimination pulse-width-modulation (PWM) improving discontinuous PWM (DPWM) reducing switching losses combined, proposing a double-modulation-wave DPWM. An additional modulation wave added, w...

this paper presents the new topology of three phase on line uninterruptible power supply (ups) by employing t-source inverter (tsi) with maximum constant boost pulse width modulation (pwm) control and the results are compared with the conventional uninterruptible power supply (ups). the conventional ups consists of voltage source inverter (vsi) with step up transformer or dc-dc booster which de...

The study of the battery charge process as the only power storage agent in off-grid systems is of significant importance. The battery charge process has different modes, and the battery in these modes is dependent on the amount of charge. In order to charge the battery in off-grid systems, two charge controllers including Pulse Width Modulation (PWM) and Maximum Power Point Tracker (MPPT) are c...

In this study, we propose a novel pulse-width modulation (PWM) method to reduces common-mode noise. The proposed includes 120-degree dormant two-phase modulated three-phase inverter that the comparative carrier of one two phases. This configuration is easy implement because it uses triangular-wave comparison. an experiment using inverter, current was reduced by approximately 60%, and in particu...

This paper presents a micro controller based control of multilevel inverter for single phase Induction motor. IGBT is used as power element. Pulse width modulation techniques (PWM), introduced three decades ago, are the most used methods to control the voltage and frequency supplied to electrical AC machines. This work proposes a new switching scheme for the cascaded H-Bridge multilevel inverte...

Switched Boost Inverter (SBI) is a single stage DC to AC power converter and it is derived from the Z source inverter employs an LC impedance network in between the main inverter bridge and the power source. This SBI converter can possible to supply both DC and AC loads simultaneously from a single dc input source. Here, reducing the inverter switching stress. Also, this converter provides to s...

In order to simplify the device of modulation and demodulation of 2FSK, a 2FSK modem based on the microcontroller AT89C51 was designed. This modem is mainly composed of an AT89C51 microcontroller, a simple two order passive low-pass filter, and a shaping circuit. Modulation is achieved on the basis of the principle of pulse width modulation (PWM). By executing PWM signal generating program, a d...

this paper presents the concepts for application of space vector modulation to two-level unidirectional pulse width modulation (PWM) rectifiers and a methodology for the use of this modulation is proposed and applied in three different groups of rectifiers. For each group of rectifiers, the converter switching stages are analyzed to determine switch control signals for space vector modulation. ...

Voltage source inverter (VSI) fed induction motors are widely used in variable speed applications. The harmonic distortion in the line currents of the inverter depends on the switching frequency and the pulse width modulation (PWM) technique employed to switch the inverter. The inverter switching loss is also strongly influenced by the PWM technique used. This paper compares the harmonic distor...