Parnklang, Jirawath

Preferred name

Parnklang, Jirawath

Alternative Name

Parnklang, J.

Main Affiliation

School of Engineering

jirawath.par@kmitl.ac.th

Now showing 1 - 10 of 22

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Mosquito Trap HV Power Supply Turn On/Off Time Parameter Consideration Measurement
(2025-01-01)
Parnklang, Jirawath
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Sowannee, Nattanicha
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Pakhunophat, Kasamaphon
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Ganasut, Siriwat
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Wisitthikorn, Pasuthida
This article attempts to find out the results for the manufacturer of ecology high voltage trap and kill small insect especially mosquitos. Due to the environment factor, it is necessary to turn on the tool at all time according to the ministerial regulation. This concept, high voltage power supply for killing mesh grid has been turned off to save the energy and is turned on when a target insect is to be kill. A turn on time that is fast enough to kill the insect complete is therefore taken into consideration to obtain the appropriate condition. A sampling of high voltage generating circuit manufacturer suitable for mosquito trap was perform. Apply appropriate input voltage to the input port of the high voltage power supply circuit, the turn on time is measurement. Testing data is useful in that we can know the appropriate input voltage for using a high voltage power supply in the mosquito trap that need to save electrical energy by turn off the high voltage power supply. The input voltage of the high voltage circuit is divided into 2 group. The first is ordinary battery with different material such as 2 cell of carbon-zinc (1.5V×2) alkaline (1.5V×2), lithium-ion and lithium-polymer (4.1v). The second is ordinary household's AC input voltage. The average data of the high voltage steady state turn on time value is in the order of lower than 50mS. Compare that data to the flying movement speed of the mosquito, it can fly distance of up 8.3 cm. This show that the mosquito detect process must be complete before the mosquito move or fly closer than 8.3 cm.To the mosquito trap. It is true that higher input voltage, the short steady state output voltage of the high voltage part. Use of this data is to optimize the input voltage or input type of the high voltage power supply that is appropriate for the mosquito detection.
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Real Time Display on IoT Mosquitoes Count Detection
(2021-04-16)
Parnklang, Jirawath
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Aroonrua, Peerapat
The designing of mosquitoes counting system instrument is presented in this work. The mosquitoes that were counted died in order not to measure duplicate counting data. As soon as the input source counting machine can detect the mosquito, the single trigger signal is transmitted to the IOT system to interrupt the server immediately. The number of real mosquito is not transmitting to the IOT but only a signal to interrupt the server.The server records the number of the interrupt signal with real-time clock. Then the interrupt information will be further handled. The front end counting machine consist of the high voltage generate with the suitable voltage value and electrode distance for the required mosquitoes size.The low trigger pulse signals of the mosquitoes killed by high voltage are sending to the controller unit. Immediately, interrupt counting signal of the number of mosquitoes is sent to the big stream data collection on IOT system by the time stamp technique. Form the measurement results, 10 live sample mosquitoes in a limited space box to fly though the counting machine show that the count results are 100 %correct count.
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Mosquitoes Flapping Detection Electrocuting Trap
(2022-01-01)
Ramkaow, Tanutpong
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Philaphang, Surangkana
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Phornphikun, Peerapakorn
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Parnklang, Jirawath
Limiting the time require to turn on the high voltage supply for mosquito electric shock in the mosquito trap is studied in this work. Form the problem of turning on the mosquito trap that must be turned on all the time throughout the system, in this title, the design system allows the high-voltage supply to be switched on only when a mosquito or an insect that is assumed to be mosquito flies into the trap. We use a usual high sensitivity condenser microphone to pick up the analog sound of a mosquito's flapping wing. The audio signal is FFT encoded by microcontroller to allow the system to decide whether that flapping sound is a local mosquito. The microcontroller digital output signal is sent to control the power on of the high voltage to trap the get rid of such mosquito. With a flying speed of a mosquito that can fly from 1.6 to 2.4 km/hr., the flapping wing sound convert time of FFT Fundamental and first Hamonic detection by ESP32 CPU and the digital port trigger output signal to power on the high voltage section, result is a mosquito, the steady high voltage power supply control signal is not over than 1 second. During the CPU process time, mosquito can fly at up to 1 mm. The operation of this system results in a lower power consumption cost that the mosquito trap must use. Based on the calculation of the mosquito trap using the principle in this title is 99% lower power consumption than the system that does not use.
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Current adjustable CMOS startup circuit with low steady state current
(2010-12-01)
Lertsalee, Watcharaporn
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Parnklang, Jirawath
This work is a CMOS Start Up Circuit designed which can supply the current flow (ISTART) adjustable to the clock oscillator for digital system generally. The circuit designed can be assigned start current value by giving the appropriate reference voltage (V<inf>BIAS</inf>). The current value is set to adjust in the range of 0 to 1.35 mA. The reference tune voltage is in the range of 0-5V to follow voltage value of microcontroller in present. In addition, while the circuit to obtain signals to PWD (power down) that current value flowing in start up circuit is almost zero. This means that the circuit does not consume any power consumption. ©2010 IEEE.
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Multi Frequency on RGB Lighting LED Driver Technique
(2020-07-30)
Parnklang, Jirawath
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Phikunthong, Lalita
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Jantri, Rawisara
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Sukpasri, Pichkanit
In this paper, we conducted RGB incident light intensity of the high power white lighting LED. The current control 50% duty cycle pulse signal source with appropriate semiconductor carrier frequency response are supply to the RGB white lighting LED. Although, the carrier relaxation time of the red blue and green light in the white lighting LED are not the same value which depend on the carrier different of the energy level. The measurement show that the lowest duty cycle appropriate pulse signal for only blue or UV base white LED give more relative light intensity than normal (low frequency) signal within 11%.
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Subthreshold operation of MOIS devices: Boundary of operation
(2000-12-01)
Parnklang, Jirawath
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Jindajitawat, Phumin
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Titiroongruang, Wisut
The boundary of MOIS operating in subthreshold are presented on this article. The MOS transistor-like structure is MOIS (Complementary Metal Oxide Intrinsic-like Semiconductor, MOIS), which prepared on gold-doped silicon. In this condition causes to change many essential characteristics of the device. We demonstrate the analytical parameters and the experimental result of the device which use to determine the subthreshold regime.
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The MIIS structure capacitor fabricated with high permittivity material
(1999-01-01)
Parnklang, J.
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Surathammanun, J.
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Julprapa, A.
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Riewruja, V.
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Titiroongruang, W.
The MIIS (Metal Insulator Intrinsic Semiconductor) structure capacitor consists of the aluminum, ZnO insulator and n-Type silicon doped with gold atoms. The different electrical characteristics of the devices from the standard MOIS (Metal Oxide Intrinsic Semiconductor) structure capacitor which is fabricated from SiO<inf>2</inf> are presented in this paper. The experimental results show that the threshold voltage of the devices (V<inf>TO</inf>) is smaller than the MOIS devices, the zinc oxide capacitor values (C<inf>OX</inf>) are higher but the total capacitor value (C<inf>T</inf>) of the device does not change.
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18650 Battery Real Time Output Resistance Test
(2020-04-01)
Parnklang, Jirawath
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Seabgsai, Tharnatip
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Yongyutwichai, Kongpak
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Wongprasert, Yothin
Designing the output resistance testing machine of popular 18650 battery while the battery supply current to the system. This tool consist of important parts which are microcontroller, used to generate control signal and process the battery voltage and current, power MOSFET and its driver circuit, battery current and voltage sense circuit. We connect the create tool with a system that used a 18650 battery pack supply. The microcontroller sent the control appropriate pulse signal from MOSFET threshold voltage level the maximum to the MOSFET driver circuit to divide some smallest current form the system. Testing the difference current form real time battery load current and test the minimum different battery voltage continuously. The voltage range that the system can test is 3.2(1ow battery single cell) to 42 (10 series cell) volts with 976 volt resolution. And also the testing current range is 0 to 10 ampere with 2.4 milliamp (mA)resolutions. The real time output resistance of the battery display form 0 milliohm (m) to 1000.00 ohm maximum value. This tool can alert the user that 18650 batteries is deteriorating.
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Daytime Solar Greenhouse Plant Light Spectum Control System
(2021-04-16)
Parnklang, Jirawath
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Kasomkul, Thitirat
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Wiangwong, Chutikarn
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Pibanpaknitee, Natcha
The design and model of greenhouse daytime constant light source spectrum from sunlight and RGB LED controlled is present in this title. According to the light color requirement that the special plant need to grow are different in each type of plant. When the requirement of plant are known, we have designed constant frequency spectrum of light in the greenhouse throughout the daytime. The design system is based on solar light which is difference in the color and intensity of light on the daytime. Light frequency adjustment system interferes with the solar spectrum in the greenhouse. The system stops interfering when the optical spectrum is the programed designed wavelength of light. The light spectrum of each color (red, blue and green) measured is normalized to realize the proportion of each color that need to intervene. The example of a plant used in a system test is a cannabis an economic crop in which each pre-harvest period requires a different spectrum ratio color of light. Other variables of plant growth be controlled as well. The sunlight that can pass through the outdoor greenhouse has already been filtered from UV and IR rays. The experimental results show the higher grow rate of the marijuana that plant in the adjust spectrum greenhouse is 12%. We also found that light spectral-optimized cannabis get a number leaf density greater than 30% compare to being grown in an uncontrolled nearby outdoor greenhouse.
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Appropriate pulse signal driving frequency for white lighting LED
(2017-02-18)
Sukpasri, Pichkanit
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Parnklang, Jirawath
This paper present selection the frequency and duty cycle time of lighting LED driver signal. It is well known that lighting LED is capacitor load and it has high luminous efficiency (lm/W). Peak current was appearing when current flowed through the lighting LED. The different lighting LED driver frequency change ratio of 5τ and steady state current. The experiment provided pulse input signal (Duty Cycle = 50%) with lighting LED driver after demonstrator had changed frequency at 100Hz, 1kHz, 10kHz. Experiment topics are as follows: 1) The ratio of 5τ and the steady state current by all frequency the value 5τ equal to 100 us. When the frequency was increase, 5τ ratio and LED power is increase as well. 2) Study the luminous efficiency of the lighting LED at 100Hz, 1kHz, 10kHz. Although the higher frequency, the 5τ ratio is increase. But driver at 10kHz has 5τ ratio equal to 2 times (Duty Cycle = 50%) and the lighting LED power increase, the luminous efficiency decrease. The appropriate frequency and duty cycle provide high luminous efficiency. The results showed that the lighting LED driver at frequency 1kHz provides the highest luminous efficiency lighting LED and appropriate driver frequency.

Parnklang, Jirawath

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