Wyniki wyszukiwania - Biblioteka Nauki

1

Simple anti capacitor open-circuit self-oscillation in a CMOS Schmitt trigger-invertor oscillator circuit for a fail-safe relay drive

100%

Summatta C. , Deeon S.

Przegląd Elektrotechniczny

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2019

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tom R. 95, nr 3

97--100

EN

Oscillator circuits with a CMOS Schmitt trigger-inverter are commonly used in applications that relate to relay driver circuits. It is possible to devise a fail-dangerous occurrence from the circuit, in which an open fault happens at the input circuit between the capacitor and input inverter IC. The causes of this self-oscillation event contribute to the failure of other parts of the circuit. This paper presents countermeasures for self-oscillation of the capacitor open-circuit self-oscillation in a CMOS Schmitt trigger-invertor oscillator circuit for a fail-safe relay drive. The proposed circuit replaces a normal 2-pin capacitor with a special 4-pin designed capacitor which connects a parallel resistor between the input CMOS inverter and the ground source. This paper carried out experimentation using Failure Modes and Effects Analysis (FMEA).The results showed that the output logic was high when the circuit had an open fault. Thus, the new designed circuit had no fail-dangerous occurrences.

PL

W artykule opisano środki zaracze zapobiegające samooscylacjom w obwodzie pojemnościowym CMOS przerzutnika Schmitta w obwodzie przekształtnika. Metoda poleg ana zastąpieniu dwukońcówkowej pojemności obwodem z czterema końcówkami z rezystorem miedzy wejściem przekształtnika a masą.

2

Application of multi-stage window comparator circuit with safety mode for swell voltage control in low voltage systems

100%

Wongcharoen S. , Deeon S.

Przegląd Elektrotechniczny

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2020

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tom R. 96, nr 5

84--90

EN

This article presents the application of a multi-stage window comparator circuit with safety mode for swell voltage control in low voltage systems that lack stability and electrical quality. High-voltage transistors were used to build a simple voltage detecting circuit with multi-stage functions and electronic load to detect and control swell voltage . SVSS as the overloaded energy receptor resulted in clamping voltage. The voltage of a device is equal to the voltage flowing to smart electronic loads and not over the IEEE 1159 and 1100 standards. The device worked normally without causing damages. Failure Mode and Effect Analysis (FMEA) might occur using a multi-stage window comparator circuit in the safety mode. The reliability and stability in detecting voltage and controlling electronic loads to work safely under many kinds of situations were also assessed.

PL

W artykule zaprezentowano wykorzystanie komparatorów do kontroli zwiększonego napięcia w systemach niskiego napięcia. Napięcie nie przekracza zaleceń norm IEEE 1159 i 1100.

3

Application of electronic load circuit for electrical safety by using a serial mode comparator

80%

Wongcharoen S. , Deeon S. , Mungkung N.

Przegląd Elektrotechniczny

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2020

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tom R. 96, nr 4

17--22

EN

This research presented an electronic load circuit for electrical safety by using a serial mode comparator as a protection device against surges caused by electrical power lacking stability and quality. The application of comparators in detecting overvoltage and driving electronic load is possible because of a transistor which is a simple device for failure prevention used in the circuit design. The properties of the circuit can be set. Relation management for failures which might occur in the electrical system is done through SPDs for surge protection. The electronic load is used as a device to reduce swell. The experiment showed that the electronic load circuit could work according to the design, without any failure, and was efficient. The let-through voltage which came to the load did not reach the level at which electrical devices and electronics would get the failure. The circuit could work without interruption. Moreover, the results from the Failure Modes and Effects Analysis (FMEA) showed that they met the specified standards.

PL

W pracy przedstawiono układ obciążenia obwodu elektrycznego/elektronicznego zabezpieczający obwód przed uszkodzeniem powodowanym przez brak stabilności zasilania. Układ wykorzystuje szeregowo połączenie komparatorów reagujących na przepięcia. Eksperymenty wykazały skuteczne działanie obwodu.

4

The application of a safety comparator in the track circuit of a railway signaling system for counting overvoltage

80%

Wongcharoen S. , Deeon S. , Kornkanok U.

Przegląd Elektrotechniczny

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2021

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tom R. 97, nr 5

146--151

EN

This article presented the application of a safety comparator in the track circuit of a railway signaling system for counting the overvoltage caused by voltage fluctuation resulting in the damage of the BR966F2 relay. Overvoltage counting in the track circuit of the railway signaling system using the safety comparator to detect two voltages in the series circuit and the fault of overvoltage of the track circuit were used for detecting the status of the train in the interlocking system of the railway signaling system, and the digital counter circuit displaying the overvoltage status to monitor and confirm the use of the BR966F2 relay of the railway signaling system that resolved the problem causing the track circuit error, minimized the duration for system maintenance, and maximized the reliable performance of the advanced safety system in the track circuit for the control and command functions of the railway’s operations of the State Railway of Thailand.

PL

W artykule przedstawiono zastosowanie układu bezpieczeństwa w obwodzie torowym sygnalizacji kolejowej do zliczania przepięć wywołanych wahaniami napięcia powodującymi uszkodzenie przekaźnika BR966F2. Zliczanie przepięć w obwodzie torowym sygnalizacji kolejowej za pomocą komparatora bezpieczeństwa do wykrycia dwóch napięć w obwodzie szeregowym oraz zwarcia przepięcia obwodu torowego posłużyło do wykrycia stanu pociągu w blokadach systemu sygnalizacji kolejowej oraz obwodu licznika cyfrowego wyświetlającego stan przepięcia w celu monitorowania i potwierdzenia użycia przekaźnika BR966F2.