This paper presents a device for measuring and maintaining the constant water level in a tank. Th... more This paper presents a device for measuring and maintaining the constant water level in a tank. The device uses a capacity sensor to measure the water level. The sensor has a DC voltage output proportional to the water level in the tank. This voltage can be used in other automation too. The water level, in percentages, is displayed on a vu meter with 8 LEDs. The circuit for maintaining the constant level consists in a comparator with hysteresis. The level of the water is adjustable, using a reference voltage from a potentiometer (marked in percentages). The level of the water is compared with the prescribed level and the difference between them commands the start/stop of the water pump which supplies the tank through a relay. The device is powered by 220 V and is isolated from the environment.
The goal of this paper is to find LEDs used in simulations for street lighting. has three paramet... more The goal of this paper is to find LEDs used in simulations for street lighting. has three parameters: V_LED, I_LED and presented a model of LED extracted from th given in the datasheet of producer. This m MDS (Model from the Data Sheet). Secondly the I-V characteristic is raised through meas equation is established, the parameters calculated with simple equations; this mod (Model Proposed from Measurements). T obtained from averaging the measurements o for many series LEDs; this model is ca Proposed from Averaging). All models simulations. After that, the results are c measurements. The errors obtained with t MPM are less than the errors obtained with model. This model is the best for simulations. The LED used in this paper is OSLON SSL The parameters of MDS are: V_LED=2.94 and R_LED=555mu. The parameters V_LED=2.934V, I_LED=350mA and R_ errors with the MDS are less than 13.33%, are less than 7.88%. The errors with the 25%. For simulations and measurements MP4021A from Monolithic Po...
This paper presents the effect of the output capacitor on the EMI spectrum of radiation. Two SEPI... more This paper presents the effect of the output capacitor on the EMI spectrum of radiation. Two SEPIC converters were designed with LT1871 (Linear Technology) and LM2577 (National Semiconductor), for an input voltage of 4 to 16V, the output voltage of 5V, output current of 0.5A, and the switching frequency of 52kHz. The functionality of the converter was simulated in LTspice IV and OrCAD, and it was compared with the experimental results. It was observed the level of output ripple with different types of capacitors. An acceptable output ripple, who respects the standards FCC Class A and Class B, was obtained with solid and tantalum capacitors in parallel with small MLCC capacitors. The minimum of ripple and frequency spectrum was obtained by adding a LC Filter to the output of the converter. With this filter the converter respects the standard SAE J1113.
This paper presents a device for measuring and maintaining the constant water level in a tank. Th... more This paper presents a device for measuring and maintaining the constant water level in a tank. The device uses a capacity sensor to measure the water level. The sensor has a DC voltage output proportional to the water level in the tank. This voltage can be used in other automation too. The water level, in percentages, is displayed on a vu meter with 8 LEDs. The circuit for maintaining the constant level consists in a comparator with hysteresis. The level of the water is adjustable, using a reference voltage from a potentiometer (marked in percentages). The level of the water is compared with the prescribed level and the difference between them commands the start/stop of the water pump which supplies the tank through a relay. The device is powered by 220V and is isolated from the environment.
In this paper a comparative study of DC-DC converters is presented. The SEPIC, Cuk and ZETA conve... more In this paper a comparative study of DC-DC converters is presented. The SEPIC, Cuk and ZETA converters in applications are detailed. Also are presented the operating simulation for these converters. The results of simulations are compared with the measurements done for a ZETA converter with an output of 3.3V and different output currents.
WSEAS Transactions on Circuits and Systems archive, 2010
This paper presents the effect of the output capacitor on the EMI spectrum of radiation, the outp... more This paper presents the effect of the output capacitor on the EMI spectrum of radiation, the output voltage ripple and the efficiency of a SEPIC Converter. Two SEPIC converters were designed with LT1871 (Linear Technology) and LM2577 (National Semiconductor), for an input voltage of 4 to 16V, the output voltage of 5V, output current of 0.5A, and the switching frequency of 52kHz. The functionality of the converter was simulated in LTspice IV and OrCAD, and it was compared with the experimental results. It was measured the level of EMI spectrum, the output voltage ripple and the efficiency of the converter with different types of capacitors. An acceptable output voltage ripple, which respects the standards FCC Class A and Class B, was obtained with solid and tantalum capacitors in parallel with small MLCC capacitors. The minimum of ripple and frequency spectrum was obtained by adding a LC Filter to the output of the converter. With this filter the converter respects the standard SAE J...
This paper presents a device for measuring and maintaining the constant water level in a tank. Th... more This paper presents a device for measuring and maintaining the constant water level in a tank. The device uses a capacity sensor to measure the water level. The sensor has a DC voltage output proportional to the water level in the tank. This voltage can be used in other automation too. The water level, in percentages, is displayed on a vu meter with 8 LEDs. The circuit for maintaining the constant level consists in a comparator with hysteresis. The level of the water is adjustable, using a reference voltage from a potentiometer (marked in percentages). The level of the water is compared with the prescribed level and the difference between them commands the start/stop of the water pump which supplies the tank through a relay. The device is powered by 220 V and is isolated from the environment.
The goal of this paper is to find LEDs used in simulations for street lighting. has three paramet... more The goal of this paper is to find LEDs used in simulations for street lighting. has three parameters: V_LED, I_LED and presented a model of LED extracted from th given in the datasheet of producer. This m MDS (Model from the Data Sheet). Secondly the I-V characteristic is raised through meas equation is established, the parameters calculated with simple equations; this mod (Model Proposed from Measurements). T obtained from averaging the measurements o for many series LEDs; this model is ca Proposed from Averaging). All models simulations. After that, the results are c measurements. The errors obtained with t MPM are less than the errors obtained with model. This model is the best for simulations. The LED used in this paper is OSLON SSL The parameters of MDS are: V_LED=2.94 and R_LED=555mu. The parameters V_LED=2.934V, I_LED=350mA and R_ errors with the MDS are less than 13.33%, are less than 7.88%. The errors with the 25%. For simulations and measurements MP4021A from Monolithic Po...
This paper presents the effect of the output capacitor on the EMI spectrum of radiation. Two SEPI... more This paper presents the effect of the output capacitor on the EMI spectrum of radiation. Two SEPIC converters were designed with LT1871 (Linear Technology) and LM2577 (National Semiconductor), for an input voltage of 4 to 16V, the output voltage of 5V, output current of 0.5A, and the switching frequency of 52kHz. The functionality of the converter was simulated in LTspice IV and OrCAD, and it was compared with the experimental results. It was observed the level of output ripple with different types of capacitors. An acceptable output ripple, who respects the standards FCC Class A and Class B, was obtained with solid and tantalum capacitors in parallel with small MLCC capacitors. The minimum of ripple and frequency spectrum was obtained by adding a LC Filter to the output of the converter. With this filter the converter respects the standard SAE J1113.
This paper presents a device for measuring and maintaining the constant water level in a tank. Th... more This paper presents a device for measuring and maintaining the constant water level in a tank. The device uses a capacity sensor to measure the water level. The sensor has a DC voltage output proportional to the water level in the tank. This voltage can be used in other automation too. The water level, in percentages, is displayed on a vu meter with 8 LEDs. The circuit for maintaining the constant level consists in a comparator with hysteresis. The level of the water is adjustable, using a reference voltage from a potentiometer (marked in percentages). The level of the water is compared with the prescribed level and the difference between them commands the start/stop of the water pump which supplies the tank through a relay. The device is powered by 220V and is isolated from the environment.
In this paper a comparative study of DC-DC converters is presented. The SEPIC, Cuk and ZETA conve... more In this paper a comparative study of DC-DC converters is presented. The SEPIC, Cuk and ZETA converters in applications are detailed. Also are presented the operating simulation for these converters. The results of simulations are compared with the measurements done for a ZETA converter with an output of 3.3V and different output currents.
WSEAS Transactions on Circuits and Systems archive, 2010
This paper presents the effect of the output capacitor on the EMI spectrum of radiation, the outp... more This paper presents the effect of the output capacitor on the EMI spectrum of radiation, the output voltage ripple and the efficiency of a SEPIC Converter. Two SEPIC converters were designed with LT1871 (Linear Technology) and LM2577 (National Semiconductor), for an input voltage of 4 to 16V, the output voltage of 5V, output current of 0.5A, and the switching frequency of 52kHz. The functionality of the converter was simulated in LTspice IV and OrCAD, and it was compared with the experimental results. It was measured the level of EMI spectrum, the output voltage ripple and the efficiency of the converter with different types of capacitors. An acceptable output voltage ripple, which respects the standards FCC Class A and Class B, was obtained with solid and tantalum capacitors in parallel with small MLCC capacitors. The minimum of ripple and frequency spectrum was obtained by adding a LC Filter to the output of the converter. With this filter the converter respects the standard SAE J...
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Papers by Florian Ion