Constant Current Supply Research Articles

Multi‐port bidirectional isolated DC–DC resonance converter with constant phase current for application in bipolar DC microgrids

AbstractThis paper proposes a new DC–DC bipolar resonance converter that combines a dual‐active‐bridge and a multi‐port resonance Buck‐Boost converter. This structure uses a resonance network between the input and output ports, which has the following advantages: it creates a constant current supply in the open‐loop mode; it keeps the current phase of the output ports constant under different loads; and it allows reversing the power from any output port by adjusting the phase shift of its switches, if the converter is connected to a DC microgrid. In this way, power can be exchanged among each of the output ports and input ports. The advantages of this converter are bidirectional power exchange, power exchange between output ports, soft switching, high efficiency, integration of transformer parasitic elements, and the modular capability to connect multiple resources at the input. Furthermore, the proposed structure of the bipolar converter has been implemented for verification purposes, and its results are presented in three modes: open loop, voltage control, and current control. Additionally, the results of different modes of power sharing and their bidirectionally are shown.

Application of titanium suboxide electrode in electrochemical polarity reversal descaling-filtration crystallization coupling system

In the electrochemical (EC) polarity reversal descaling, frequent polarity reversal shortens the electrode's service life, and the large amount of scale peeled off from the cathode can impact the quality of the effluent. To overcome these challenges, this study proposes a periodic polarity reversal electrochemical descaling process coupled with a filtration crystallization (FC) system. Both the anode and cathode utilize titanium suboxide (Ti4O7) electrodes to remove hardness ions from circulating cooling water (CCW). The unique oxygen vacancy structure of Ti4O7 electrodes allows for an extended electrode lifespan which is 2.5 times electrode lifespan under the constant current supply mode through periodic polarity reversal. In comparison to mesh electrodes, plate electrodes exhibit higher water treatment efficiency and scale detachment ability. The optimal descaling efficiency of 17–20 % was achieved at a current density of 8 mA·cm−2 and a flow rate of 2.7 L·h−1. After operating for 420 min and then reversing the polarity, the scale detachment reaches 90.2 % within 20 min of polarity reversal. By coupling the electrochemical process with a filtration crystallization system filled with artificial zeolites, the overall hardness removal of the system can be increased to 25.5 %–27.3 %. Furthermore, the system maintains good treatment performance even after 20 cycles. This study innovatively applies the Ti4O7 electrodes to electrochemical polarity reversal descaling, providing a reference for the development of related descaling technologies.

Effect of Process Parameters on Arc Shape, Macroscopic Features, and Microhardness in Pulsed GMA–Additive Manufacturing

Gas metal arc welding-based additive manufacturing (GMA–AM) is a promising, low-cost approach to fabricate large-scale and complex geometry components using layer-by-layer deposition of metals. However, the low forming accuracy of GMA–AM still limits its one-off industrial application due to the strong and nonlinear interactions between arc–droplet transfer and molten pool. To fully understand the influential mechanism of this inherent interaction in the GMA–AM process to precisely control the part accuracy, the arc–droplet transfer behavior in the GMA–AM process with different current waveforms was firstly studied experimentally. The phenomena of the arc swing and the differing droplet transfer with the increase in deposited height were interpreted. The thermal force status of the molten pool and its balance boundary conditions were also theoretically analyzed. Finally, the microstructure and the hardness of the AM parts with different cooling times were tested and analyzed. The experimental results demonstrate that using the spray droplet transfer mode can generate a stable AM process under direct current application conditions, but it easily ends the AM process at the third or fourth layer deposition owing to excessive heat input. A more highly accurate deposition morphology can be obtained in one droplet per pulse mode under pulsed current application conditions, which also indicates that the AM process with a constant current welding supply is stabler and easily produces better deposition than the process with a constant voltage welding supply. With the increase in cooling time, the microstructure evolved from fine ferrite to equiaxed ferrite and to columnar ferrite combined with acicular ferrite with a lower proportion of pearlite in the vertical direction of the part, and the average hardness changed to ~168 HV (bottom), ~175 HV (middle), and ~250 HV (top). The analysis indicates that the heat accumulation of the molten pool is a critical factor that affects the deposition accuracy. To this end, a novel strategy that uses the heat accumulation to compensate for the energy formed in the molten pool is proposed to further reduce the arc heat input and weaken the heat accumulation, and its feasibility is discussed.

Exploring the Effect of Energy Storage Sizing on Intermittent Computing System Performance

Batteryless energy-harvesting devices promise to deliver a sustainable Internet of Things. Intermittent computing is an emerging area, where the application forward progress, i.e., computation beneficial to the progress of the active application, is maintained by saving the volatile computing state into nonvolatile memory before power interruptions, and restored afterward. Conventional intermittent computing approaches typically minimize energy storage to reduce device dimensions and interruption periods, but this can result in high state-saving and -restoring overheads and impede forward progress. In this article, we argue that adding a small amount of energy storage can significantly improve the forward progress. We develop an intermittent computing model that accurately estimates the forward progress, with an experimentally validated mean error of 0.5%. Using this model, we show that sizing energy storage can improve the forward progress by up to 65% with a constant current supply, and 43% with real-world photovoltaic sources. An extension to this approach, which uses a cost function to trade off the energy storage size against forward progress, can save 83% of capacitor volume and 91% of interruption periods while maintaining 93% of the maximum forward progress.

Electrocatalytic degradation of acetaminophen by fluorine-doped graphene oxide: Efficiency and mechanism under constant current and pulse current supply

Doping graphene with fluorine atoms could increase the capacitance of graphene and promote the migration of ions and electrons, thereby increasing electrocatalytic activity. For energy conservation and environmental protection, fluorine-doped graphene oxide was made by an effective solvothermal method and then used as a cathode for acetaminophen (APAP) degradation under constant current and pulse current supply. Unexpectedly, the removal rate of APAP was the same under constant current and pulse current supply within 120 min. To clarify the underlying mechanism under constant current and pulse current supply, various active species generated during the reaction were analyzed. It was found that the different functional active species contributed to the efficiency under constant current and pulse current supply. O2•− and chloride reactive species were favorably generated during constant current supply and oxidized APAP, whereas •OH played a critical role in APAP oxidation without current supply. Two possible routes for APAP degradation are proposed under constant current and pulsed current supply. This research first uses the synergic effect of the electron storage capacity and the electrocatalytic capability of fluorine-doped graphene oxide for pollution degradation, and deepens the understanding of fluorine doping for the electrochemical catalytic oxidation of APAP.

Low-Power Two-Phase Clocking Adiabatic PUF Circuit

Internet of Things (IoT) has enabled battery-powered devices to transmit sensitive data, while presenting high power consumption and security issues. To address these challenges, adiabatic-based physical unclonable functions (PUFs) offer a promising solution for low-power and secure IoT device applications. In this study, we propose a novel low-power two-phase clocking adiabatic PUF. The proposed adiabatic PUF utilizes a trapezoidal power clock signal with a time-ramped voltage to achieve an improved energy efficiency and reliable start-up PUF behavior. Static CMOS logic is employed to produce stable challenge-response pairs (CRPs) in the adiabatic mode. The pull-down network is designed to control the PUF cell to charge and discharge its output nodes with a constant supply current during secure key generation. The body effect of PMOS transistors, ambient temperatures, and CMOS process variations are investigated to examine the uniqueness and reliability of the proposed work. The proposed adiabatic PUF is simulated using 0.18 µm CMOS process technology with a supply voltage of 1.8 V. The uniqueness and reliability of the proposed adiabatic PUF are 49.82% and 99.47%, respectively. In addition, it requires a start-up power of 0.47 µW and consumes an energy of 15.98 fJ/bit/cycle at the reference temperature of 27 °C.

Experimental study on luminous intensity of white LEDs of different configurations

The relationship with input voltage to the light intensity at constant current supply of four (04) separate white LEDs containing different number (5,9,13 and 27 pcs) of SMD chips are investigated in this research. Voltage between 10 and 16 volts is applied to LED lights at constant current supply. The light intensity produced by the LEDs was measured. Light intensity was found linear related to the voltage. The phosphor coating over the chips are also observed by microscope and found that the light intensity has an important impact on phosphor coating. The light intensity found lower than the expected due to the non-uniformity of phosphor coating.

Electrocution as an alternative euthanasia method to blunt force trauma to the head followed by exsanguination for non-viable piglets

BackgroundOn farms, the currently approved and most widely practised method of euthanising non-viable piglets is blunt force trauma to the head followed by exsanguination. However, the use of this method is criticised due to public perceptions and aversion to the methodology by caretakers. Therefore, electrocution after electrical stunning was examined as an alternative approach in 80 hybrid piglets. Initially, electrocution was simulated with finite element analysis using a computer piglet-model, where current density in the heart was visualised and size and position of the electrodes were defined. The following step investigated electrical parameters for electrocution in anaesthetised piglets; first, with a constant voltage power source and then with a constant current power source. The electrical stunning was examined using the constant current supply. Finally, the results of electrical stunning and electrocution were verified in 25 healthy piglets with a body weight between 1 and 2 kg. Unconsciousness was proven by testing palpebral, corneal and nociceptive reflexes. Time of death was confirmed by electroencephalography (EEG) and electrocardiography (ECG) records.ResultsStunning succeeded with the preset of 1.3 A and 50 Hz, placing the electrodes on both sides of the head between the eyes and ears using different timespans between 8 and 20 s. Prolonged electrical flow resulted in reduced paddling movements after the epileptic seizure, and allowed undisturbed reflex tests and installation of electrodes for EEG and ECG recording during electrocution. Using 0.75 A and 400 Hz, pin-shaped electrodes were first positioned on both sides of the chest for 5 s, followed by a break of 20–30 s and a second current flow, whereby the electrodes were placed above the withers and the sternum for 5 s. Cardiac arrest and an isoelectric EEG were induced within 3 min after the onset of the electrical flow through the chest. The most obvious indicator of effective stunning and electrocution was termination of rhythmic breathing. Piglets with cardiac arrest showed only single gasps lasting up to 3 min after electrocution.ConclusionsThe evaluated stunning and electrocution protocol might ease concerns about timely piglet euthanasia. However, this should be verified in non-viable piglets to exclude influencing factors like dehydration and diseases.

Arduino-based Impedance Spectroscopy: An Open-source Platform For Physiological Impedance Spectroscopy Measurements In Rats

Assessment of body water and compartmentalization is an important experimental outcome in many studies. Whole-body impedance spectroscopy permits assessment of body water and composition; however the expense of commercially available systems can be prohibitive. PURPOSE: The purpose of this project was to develop an affordable, open-source, and precise system to perform whole-body impedance spectroscopy in rats. METHODS: Commercially validated circuit components, as described in the literature, were evaluated and compiled. An impedance spectroscopy system was designed using KiCad. Simulation and modeling of the circuit and instrumentation output was performed using LTSpice. The software was developed using Python, Arduino IDE. The system includes an internal per measurement calibration system and a constant current supply. The system was tested using serially-diluted KCl cells and an equivalent thorax circuit (RRC circuit). Validation studies were performed in anesthetized rats (2% isoflurane in 95% O2, 5% CO2) rats in-vivo (n-4, ~350 g). RESULTS: The impedance spectroscopy system was based on a built-in Arduino-Mega and AD5933 integrated circuit (Analog Devices) using open-source software. The system includes an internal per measurement calibration and constant current supply, and was able to stably iterate through excitation frequencies from 1 to 300 kHz. Admittance data obtained from rats were plotted in a complex plane. After least-squared semicircular regression analysis, there were consistent correlations within rats (triplicate) and among individual rats (n=4) on consecutive days. Total costs of the system was less than $250. CONCLUSION: We developed an affordable (open-source platform that precisely and repeatably provides whole-body impedance spectroscopy measurements in rats. The rat impedance results were qualitatively consistent with published data. This system can also be reprogrammed and reconfigured for use in other physiologic applications.

Towards radio transceiving in-vivo nano-robots

An implementable model and simulation of an oscillating Carbon Nanotube (CNT) for radio communication in nanorobots is presented. A cylindrical CNT cantilever beam, operating under constant direct current supply, is forced to continuously oscillate by applying a controlled electromagnetic force. Oscillation parameters are computed and simulated, including the maximum tip displacement, the acting electromagnetic force and the dynamic response of the CNT, yielding a frequency of oscillation. We develop a model to predict the oscillation frequency of the cantilever beam based on its properties, including the device geometry. The primary functional component of the system is the electrically chargeable cantilever beam which oscillates due to its electric charge and discharge, where the discharge happens when the cantilever moves closer to the counter electrode. Thus, we provide an implementable design of in-vivo transceiver, suitable for future large-scale applications based on radio communicating nanorobots. A swarm of such nanorobots can be regarded as implementable programmable matter.

Temperature Effect and Its Compensation of a Micromachined 2-D Anemometer

This paper presents a semi-empirical model for the temperature effect of a micromachined 2-D anemometer. The anemometer consists of a self-heated double Wheatstone bridge. Eight thermistors are symmetrically arranged in two orthogonal directions, and four of them in each direction make up a Wheatstone bridge. The eight thermistors simultaneously act as both heating and sensing elements. The terminal voltage across the bridge and the bridge output voltage, under the constant current supply, are utilized to measure the wind speed and direction, respectively. The semi-empirical model has taken the thermal physical properties of the air, sensor substrate, and thermistors into account. It shows that the measurement of wind direction has a weak temperature dependence due to the symmetric config uration of the self-heated double Wheatstone bridge, which suppresses the temperature drift. The temperature compensation has been performed by means of the semi-empirical model. The experimental measurements demonstrate that, when the air temperature changes from 270 to 310 K, the wind speed varies from 0 to 30 m/s with an error less than ±1.5 m/s while the wind direction spans from 0° to 360° with the weak temperature dependence.

Configuration of a Self-Heated Double Wheatstone Bridge for 2-D Wind Sensors

A self-heated double Wheatstone bridge configuration for a 2-D wind sensor is presented. Without a central heating element, eight thermistors are symmetrically arranged in two orthogonal directions, and four of them in each direction make up a Wheatstone bridge. The eight thermistors simultaneously act as the heating sources and temperature sensing elements. By applying the constant current supply to the bridge, the terminal voltage across the bridge and the bridge output voltage are utilized to measure the wind speed and direction, respectively. The 2-D wind sensor has been simulated numerically and fabricated directly on the ceramic substrate. Experiments demonstrate that the measured speed varies from 0 to 40 m/s with an error less than ±2 m/s while the measured direction spans from 0° to 360° with an error less than ±3° after calibration. The double bridge configuration greatly simplifies the measurement and control circuits for the 2-D wind sensor.

A Novel Diagnosis and Location Method of Short-Circuit Grounding High-Impedance Fault for a Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

Cabled underwater information networks (CUINs) have evolved over the last decade to provide abundant power and broad bandwidth communication to enable marine science. To ensure reliable operation of CUINs, it is essential to have the technology for high-impedance fault diagnosis and isolation with high reliability and accuracy. The short-circuit grounding high-impedance fault status of mesh topology constant current remote supply system was diagnosed by analyzing the variation difference of equivalent current in the Laplace transform domain. Shore power feeding equipment (SPFE) supplied the power for underwater system individually from both terminals, and the fault location was located by calculating the shunt loss of the current in the trunk before and after the fault. Thus, the fault was isolated to maintain normal operation of the rest of the system and improve the reliability of CUINs. According to the established typical mesh topology constant current remote supply system circuit model, the fault location scheme was designed to simulate the faults of the cable sections in the different links in the constant current remote supply system, and the changes of current located at the primary nodes (PNs) in the Laplace transform domain before and after the fault were analyzed. The results show that the equivalent current of each PN changes when a fault occurs in the system, and the location of the fault point can be analyzed by comparing the shunt loss of the current in the trunk before and after the fault. The designed method of short-circuit grounding high-impedance fault diagnosis and location for a constant current remote supply system is suitable for the fault monitoring and judgment of CUINs with high feasibility and practicality. Furthermore, it provides technical support for the resulting effective determination of faults, isolation of faults, protection of equipment, and improvement of the system reliability.

Self-Assembly of Metal Oxide Nanoparticles in Liquid Metal toward Nucleation Control for Graphene Single-Crystal Arrays

Summary We have achieved the spontaneous assembly of alumina nanoparticles on a liquid metal surface and further synthesized a very-large-scale graphene single-crystal array. The effective electrical field established as a result of the electrical charge of the alumina nanoparticles in the liquid metal ensures the ordered self-assembly of the alumina islands and lays the foundation for precise spatial control of graphene nucleation, leading to the formation of graphene single-crystal arrays. In addition, controlling the density of the alumina in the liquid metal can precisely tune the periodicity of the arrays. This simple strategy, which is unlike the usual solid/aqueous solution system, opens up new territory for nanoparticle assembly. Focusing on the origin of the nanoparticle interaction that drives the self-assembly of ordered structure in the liquid metal system is a promising avenue for triggering more interesting applications.

Development of a High-Speed Current Injection and Voltage Measurement System for Electrical Impedance Tomography-Based Stretchable Sensors

Electrical impedance tomography (EIT) is an imaging method that can be applied over stretchable conductive-fabric materials to realize soft and wearable pressure sensors through current injections and voltage measurements at electrodes placed at the boundary of a conductive medium. In common EIT systems, the voltage data are serially measured by means of multiplexers, and are hence collected at slightly different times, which affects the real-time performance of the system. They also tend to have complicated hardware, which increases power consumption. In this paper, we present our design of a 16-electrode high-speed EIT system that simultaneously implements constant current injection and differential potential measurements. This leads to a faster, simpler-to-implement and less-noisy technique, when compared with traditional EIT approaches. Our system consists of a Howland current pump with two multiplexers for a constant DC current supply, and a data acquisition card. It guarantees a data collection rate of 78 frames/s. The results from our conductive stretchable fabric sensor show that the system successfully performs voltage data collection with a mean signal-to-noise ratio (SNR) of 55 dB, and a mean absolute deviation (MAD) of 0.5 mV. The power consumption can be brought down to 3 mW; therefore, it is suitable for battery-powered applications. Finally, pressure contacts over the sensor are properly reconstructed, thereby validating the efficiency of our EIT system for soft and stretchable sensor applications.

POWER, METALLURGICAL AND CHEMICAL MECHANICAL ENGINEERING FLOW TYPE THERMOELECTRIC HEAT TRANSFER INTENSIFIER

Objectives. The aim of the study is to develop a construction design that increases the intensity of heat exchange between media and optimises the energy and mass dimensions of the instrument indicators. Methods. A method for the theoretical investigation of thermoelectric heat transfer intensifiers is used, which, by means of forced air flows along the junctions of thermoelements, provides a higher coefficient of heat exchange between media moving in transport zones with altering temperature. Results. The construction of a thermoelectric heat transfer intensifier is proposed, which uses fan assemblies to force air flow in the respective gaps between the junctions of the thermoelements and the media moving in transport zones to increase the heat transfer coefficient. A device model based on the solution of the heat balance equations for media flows in transport zones, thermoelectric battery surfaces and gaps between transport zones and battery surfaces for direct flow conditions is considered. Theoretical studies of the heat transfer intensifier using the developed model were carried out. The dependencies of the media temperature alterations at the output of the heat transfer intensifier on the value of the heat transfer coefficient between the junctions of the thermoelectric battery and the air medium in the gap are determined for a fixed value of the thermoelectric battery supply current equal to 5 A. Conclusion. It is established that an increase in media temperature difference at the input contributes to a sharper decrease in the dependencies of the limiting lengths of the thermoelectric battery on the heat transfer coefficient between the junctions of the thermoelectric battery and the air medium in the gap at a constant supply current.

A Current Supply with Single Organic Thin-Film Transistor for Charging Supercapacitors

Supercapacitors (also referred to as ultracapacitors, electric double-layer capacitors) bridge the gap between rechargeable batteries and electrolytic capacitors with moderate capacity and fast charging and are very promising for electric energy storage. Compared with lithium-ion batteries, supercapacitors are also superior regarding cycle life, specific power, and operating temperature. However, the cost per kWh of supercapacitors are tenfold to lithium-ion batteries. Printed electronics offers a route to a low-cost manufacturing platform that enables mass production of supercapacitors at low cost. Supercapacitors are usually charged with constant current supply, for example, Keithley 2200 programmable power supply. Here we present a current supply with single organic thin-film transistor (OTFT) to charge supercapacitors. The current supply takes power directly from the electric grid (115 V AC, US standard), converts the AC voltage to a quasi-constant current (~0.1 mA) regardless of the impedance of loads, and charges the supercapacitors. This work demonstrates steps towards all printable supercapacitor energy storage systems integrated with chargers that enable direct charging from the power outlet. Solution-processed OTFTs based on the popular polymer semiconductor P3HT have been developed to rectify 115 V AC voltage. The P3HT OTFTs were fabricated on glass substrates and Au electrodes for drain and source were patterned with a standard UV-lithographic lift-off process. The thickness of the spin-coated P3HT layer is around 35 nm. In order to operate the transistors at such high voltage, a rather thick (2500 nm) polymer PMMA was deposited on the P3HT as the gate dielectric. For gate electrodes, 100 nm Al was subsequently deposited by thermal evaporation through a shadow-mask. The channel length and width are 50 um and 55 mm respectively. The transistors delivers 0.7mA current when the drain voltage and the gate voltage are both at -200V. The average mobility is 2.6x10-2 cm2/Vs while the average threshold voltage is 2V. A diode-configured OTFT was used to rectify 115 V AC as a half-wave rectifier. Paralleling a 15-uF capacitor with the load, the ripples were smoothed and a DC output was obtained. With a 10-kΩ load, the output current is 0.1 mA at a voltage of 1 V. Varying the load from 10 kΩ to 100 kΩ, the voltage across the load increased to 8 V (eight times higher) while the output current dropped only 20% to 0.08 mA. The rectifier thus provides quasi-constant current output for different loads. In addition, no other voltage step-down devices, for instance, transformers, are required to take the 115 V AC voltage down to a few volts. During charging of the supercapacitors, the load resistor also works as a protection device that protects against overcharging. This single OTFT current source was demonstrated to charge a 430mF supercapacitors to 1 V directly using 115 V AC voltage from power outlet.

Pulsed Electrokinetic Removal of Chromium, Mercury and Cadmium from Contaminated Mixed Clay Soils

ABSTRACTElectrokinetic remediation (EKR) processes are energy intense systems as they are mainly run under continuous constant current supply mode. In this study, pulsed electrokinetic remediation (PEKR) technique was employed for the removal of Cd, Hg and Cr from mixed contaminated natural clay and bentonite soils. The effects of voltage gradient, pulse duty cycle and bentonite/clay ratio on the simultaneous removal efficiencies of the heavy metals and specific energy consumption were investigated. Fifteen (15) PEKR experiments were conducted according to Box–Behnken design (BBD) with each experiment allowed to continuously run for 21 days. Increase in the proportion of the bentonite significantly decreased the removal efficiency of the heavy metals while having insignificant effect on the energy consumption. Conversely, increase in both voltage gradient and pulse duty cycle increased the heavy metals removal efficiencies, though at the expense of increase in energy consumption due to combine effects of increase in the soil electrical conductivity, amount of current needed to sustain the applied voltage gradient as well as the raise in the soil pH. The maximum achievable removal efficiencies for Cd, Hg and Cr were 21.87, 78.06 and 89.64% respectively. The specific energy consumption significantly increased from the range of 91.67–154.17 kwh/m3 to 1700–2441.67 kwh/m3 as a result of combined effect of increasing voltage gradient and pulse duty cycle. This demonstrated that effective PEKR could be achieved with significance reduction in the energy consumption via appropriate selection of pulse duty and voltage gradient for clay soils of different proportion of montmorillonite.

Generalized space vector control for current source inverters and rectifiers

Abstract Current source inverters (CSI) is one of the widely used converter topology in medium voltage drive applications due to its simplicity, motor friendly waveforms and reliable short circuit protection. The current source inverters are usually fed by controlled current source rectifiers (CSR) with a large inductor to provide a constant supply current. A generalized control applicable for both CSI and CSR and their extension namely current source multilevel inverters (CSMLI) are dealt in this paper. As space vector pulse width modulation (SVPWM) features the advantages of flexible control, faster dynamic response, better DC utilization and easy digital implementation it is considered for this work. This paper generalizes SVPWM that could be applied for CSI, CSR and CSMLI. The intense computation involved in framing a generalized space vector control are discussed in detail. The algorithm includes determination of band, region, subregions and vectors. The algorithm is validated by simulation using MATLAB /SIMULINK for CSR 5, 7, 13 level CSMLI and for CSR fed CSI.

GPS 위성통신과 아두이노를 이용한 에너지 절약형 LED 가로등 제어 시스템 개발에 관한 연구

Abstract A streetlight control system was developed using information technology and LED lights for efficient management and energy savings. The proposed system can control the power usage of an LED streetlight luminaireusing GPS satellite communication and an Arduino with a built-in microprocessor. A control circuit was designed to control the current using GPS, a control unit, transistor, resistor, and constant-current supply circuit. The circuit was validated through experiments with normal operation. Using GPS, the control system extracts accurate time and location information according to the season, and it controls the current supplied to the LED streetlight according to the extracted time. Power consumption was reduced by more than 11%. The control system could reduce accidentscaused by conventional lighting systems used to save energy, and it could improve the inefficient management of energy by preserving constant brightness of a streetlight at times and in areas that have less traffic.