Questions tagged [current-sensing]
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188 questions
2 votes
4 answers
352 views
Low-side current sensing with negative voltage
simulate this circuit – Schematic created using CircuitLab I am working on a power converter circuit and need to sense the current coming out of the rectifier. A high-side current sense setup ...
0 votes
2 answers
119 views
Circuit to sense and mirror current in the output
I am trying to design a circuit that measures the current drawn by the output load and mirrors that current somewhere else. The idea is shown in the figure where we have an amplifier driving the load. ...
- 558
1 vote
4 answers
148 views
Current sensor does not work with motor driver
I use current sensor to prevent too high current in DC motor. Logic is powered by STM32F103C8T6 and it gets output values with ADC. This scheme (differential amplifier on Rail-to-Rail op amp) gives ...
- 11
1 vote
1 answer
65 views
Unpowered Fuel Gauge Sinks Current Through Sense Inputs
The BQ34Z100PWR-R2, used for battery stack fuel gauge in a circuit below, sinks approximately \$70\,mA\$ through each input, namely SRN and SRP with battery source at \$12\,V\$, while being unpowered (...
- 2,514
1 vote
1 answer
117 views
Is it OK to use the inverting input of the opamp as reference input?
In order to measure negative current without a negative supply, I mix the current sense signal with the positive reference. Now, when the current increases, the control signal decreases. To stabilize ...
- 115
1 vote
1 answer
61 views
Sensing Reduced Current When Power Is Switching / Checking For Sustained Input Voltage Before Delivering Output
I am troubleshooting a circuit I have designed and have come to a major road block. I am using a current sense amplifier to determine if there is a drop in current. I know that the output of this ...
- 305
4 votes
3 answers
647 views
Sensing current down to tens of nA with INA828 or other OPA
I need to measure the current draw of DUT that can be an MCU in deep sleep, such as Attiny85, or a more power hungry MCU that is powered off by TPL5110. In this post, I proposed a circuit where an ...
- 113
2 votes
0 answers
44 views
Window current detection through a current sense differential amplifier and a comparator
I'd like to implement a circuit to detect the over-current through a grounded load. The limits for that current are either 3mA DC current or -3mA and 3mA in case of bipolar AC current. I want to ...
- 97