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Fault indicator scheme

Published time : 2017-09-12 motor control
The fault acquisition unit MCU adopts TI's MSP430 scheme, and the fault collection unit MCU adopts ST's STM32 scheme.The power supply uses TI's Buck and Maxim's Boost low IQ products. The MAX6864 monitors the operating voltage stability and watchdog time.

Solution Introduction

The fault indicator is used for ground faults, short circuit faults, etc. of medium and low voltage transmission lines, and is easy to locate and repair.

Using fault detection technology, wireless communication technology, computer technology, network communication and information modeling and other related technologies, the operation control system for distribution network automation, optimization operation, coordinated control and power distribution terminal construction.

The system is divided into a fault collection unit and a fault collection unit.

The fault acquisition unit MCU adopts TI's MSP430 scheme, and the fault collection unit MCU adopts ST's STM32 scheme.

The power supply uses TI's Buck and Maxim's Boost low IQ products. 

The MAX6864 monitors the operating voltage stability and watchdog time. 

The MAX4634 is used to switch the signal acquisition of the signal chain circuit. 

The MAX40203 acts as an electronic switch for switching the backup power channel.

The MAX6029 Used to provide a reference voltage to the ADC and the MAX3485AE for system performance debugging.

Other product lines are used in this project, such as Semtech's SX122, ESPON's RX-8025T and Crystal, Microchip's MCP6V11, MCP6V12 and EEProm, Intersil's LDO products, and SIMCOM's 2G and 4G modules.


Fault indicator scheme framework

Fault indicator scheme framework 1

Fault indicator scheme framework 2

Main function and performance parameters:

The MAX17224 ultra-low quiescent current DC-DC boost converter with a true shutdown function disconnects the output from the input with no forward or reverse current. The output voltage can be selected by a 1% standard resistor.

The MAX40203 is an ideal diode current switch with very low voltage drop, almost an order of magnitude lower than Schottky diodes, support for Enable functionality, and integrated thermal protection.

The MAX6864 integrates voltage monitoring, watchdog timer, and manual reset. Once the monitored voltage is below the factory-set reset threshold, a manual reset is triggered or the watchdog timer times out, the device asserts a reset.

The MAX4634 is a fast, low-voltage, 4-channel CMOS analog switch that is programmable to select the channel that needs to be turned on.

The MAX6018A is a precision, low-voltage, low-dropout, micropower voltage reference that provides 1.2V, 1.6V, 1.8V, 2.048V output voltage options.

The MAX6029 micropower, low-dropout bandgap voltage reference features ultra-low operating current and low drift, and offers 2.048V, 2.5V, 3V, 3.3V, 4.096V, and 5V output voltage options.

The MAX3485AE is an RS-485/422 transceiver with ±20kV ESD protection optimized for extended cables in noisy environments. All devices operate from a single 3.3V supply.


The core advantages of the program:

The MAX17224 has transient protection enabled after startup. The quiescent current is 300nA, the operating voltage range is 0.4v~5.5v, the conversion efficiency is up to 95%, the minimum startup voltage is 0.88v, the output current is 1A, and the package size is small.

The MAX40203 has a voltage drop of less than 50mV@500mA, a quiescent current of 300nA, and a 20nA reverse leakage. The package size supports SOT23-5 and 4-bump WLP.

The MAX6864 features an ultra-low operating current of 170nA, which is insensitive to short-term transients on VCC. It offers six minimum reset delay options ranging from 10ms to 1200ms and feed time of 3.3s and 209s, eliminating the need for external components.

The MAX4634's Ron is 4Ω, the Ron Match between the channels is 0.3Ω, and the Ron flatness is 1Ω. It has fast Ton and Toff with 18ns and 11ns, respectively.

The MAX6018A has an initial accuracy of ±0.2%, a low temperature drift of 50ppm/°C, an operating current of less than 5uA, a 1mA source current, and a 200mV low dropout voltage.

The MAX6029 has an initial accuracy of ±0.15%, a low temperature drift of 30ppm/°C, an operating current of 5.25uA, a 4mA source current, and a 200mV low dropout voltage.

The MAX3485AE features short-circuit output protection, hot-swap capability, communication rates up to 20Mbps, ±20kv ESD HDM, ±15kV gap discharge protection, ±8kv contact discharge ESD protection, and up to 128 transceivers on the bus.


Solution application segment:
  • industrial control
  • data collection system
  • Sample and hold circuit
  • Portable deviceBattery powered device.

Key Components

No. Part Number Manufacturer
1 AT45DB321E-SHF MICROCHIP
2 MCP6V11-E/SN MICROCHIP
3 MCP6V12-E/MS MICROCHIP
4 RX-8025T EPSON
5 SX1212IWLTRT SEMTECH
6 MAX6018AEUR12+T MAXIM
7 ISL80103IR18Z-T Renesas
8 MAX17224ELT+T MAXIM
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