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171 Threads found on Hall Current
In the ACS724LLCTR-10AU hall sensor, page 7 states that accuracy is +/- 6% of maximum value. That means +/-600mA . Surely the accuracy can?t be that bad? Supposing I want to monitor a current of 600mA. ?This means that the accuracy would be literally nothing? ACS724LLCTR-10AU Unidirectional hall sensor datasheet:
Hello We wish to sense 200mA of current max in a LED drive circuit and there will be 200v of potential between the current sense bit and the output signal bit. No hall sensors seem to do low these are all up to at least 20A
Hello We wish to sense 200mA of current max in a LED drive circuit and there will be 200v of potential between the current sense bit and the output signal bit. No hall sensors seem to do low these are all up to at least 20A
i think you can get hall sensors specifically for mains measurement too. - - - Updated - - - if you are sensing for mains with a transformer and dont need to draw current as such, you still need fairly some size because of the build up of magnetising current.
Hello, I am trying to measure ac current flowing through an ac motor using hall effect current sensor ACS712 with maximum current rating of 5A. The sensor is interfaced to the raspberry pi through an ADC in series with the motor. The problem I am facing is everytime I get 2.5V from the output pin(Vo) of the sensor. (...)
I think what it is doing is measuring voltage directly across the battery and using a hall sensor to monitor the current to one or more batteries in a chain (the current will be the same in them all as they are in series). That allows power to charge the battery to be measured and power drawn from the battery to be measured but I can't see (...)
but the "direct measurement" does not meet my given criteria as this is for my thesis project Suppose you didn't yet understand what a "direct measuring" or "direct reading" hall sensor in contrast to a compensating sensor is, in any case you didn't yet specify your requirements.
Normally your define what error you can allow then choose the best method. hall sensors are convenient and can be low cost but high cost for self-calibrated liner type I prefer a 50~100mV shunt and have used this method up to 10kA
Page 20 of the ACS724 hall sensor datasheet says that its output when sensed current is zero is vcc/2. Why should this be so for the unidirectional version??surely it should be 0v output for 0A sensed current? ACS724 hall sensor datasheet:
You mention that shunt has very low size and hall sensors have simply low I do not agree. A four terminal shunt cannot be very low in size (compared to a hall sensor that can be even a SMD part).
Sounds like you need a hall effect sensor in the primary to detect dc imbalance. Then as you suggest : I can use such a signal to tell the MCU to attenuate the PWM signal for a specific half wave only.
you could just use a hall sensor and read its output into a comparator to see if there is overcurrent. (ensure hall sensor bandwidth is fast enough for your purpose) Short circuit has happened when output volts has gone to zero, so just detect the zero volts and that is it.
Hello i am working on 3 Phase ACIM drive. now i have to work on current sense so that motor could not get damage under overload and short circuit condition. my question is which is best method for current sense. 1) hall effect sensor for AC current measurement at output phase 3) CT current sense at (...)
Also consider a hall sensor. At 800A you may find you can mount it near your wiring at some strategic angle or position, with no need to disconnect existing wires.
I appreciate all the great advice. I found this kit on ebay (see attached). It?s under $10USD so I?ll give a try. I also found these hall effect sensors on Digikey for about $1/pc. I?ll try those as well. I have attached a circuit which shows what crutschow described. I?ll test both setups and provide some feedback. Thanks for all the responses.
i am using acs 20a hall effect sensor it outputs 100mv / amp. i am using this to measure ac motor current, how to measure ac millivolt using 10bid adc my controller is pic18f4620. kindly tel me the measuring technique i am fed up i tried all the methods in google but i cannot get accurate results kindly help . complier used is ccs
I am having problem in measuring inductive load current with acs712(20amps) hall effect sensor, for resistive load it works 99% accurately. I am using pic micr 18f4620 this is my sample code While(1) { n1 = 0; j = 0; for(int16 i = 0;i<20;i++) { n1++; Table_sinusoide =get_adc_value(3); delay_us(997); j++; } mini =
Hello, We are using ACS770LCB-050U-PFF-T hall sensor. On page 5 of its datasheet it says the min load resistance from VIOUT to ground is 4700R. It also says the maximum load capacitance is 10nF. Does this mean we have to connect at least 4700 (or lower value) from VIOUT to ground? Also, does it mean that we may not connect more than 10nF from
proposal: ACS712 hall effect sensor to measure the DC current , with galvanic insulation range 0-5A , 0-20A ADC12 bits like MCP3304 4CH 12 bits for : -Amps (analog signal from ACS712) -Battery voltage -temperature LM35DZ (0-50C) 0 -500mV use classic I2C protocole or maybe a specialized device .. see LTC family power management & other s
Hello, What happens if the unipolar version of the ACS770LCB-050U hall sensor gets current flowing through it the ?wrong way?? The datasheet doesn?t say.