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Questions tagged [voltage-monitor]

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3 votes
3 answers
237 views

Limiting voltage on voltage monitoring pin

Question: How do I limit the voltage on a voltage monitoring pin to 28 V DC (due to voltage rating) when the power rail voltage to be measured may go up to 48 V DC continuous? Are there DC-DC ...
user3586056's user avatar
0 votes
1 answer
41 views

Accumulate load time and retain through a power cut?

I have a question around closing a relay after a load been active for a specific elapsed time; and the time is always known even through a total power cut; ideally din rail components would be able to ...
Anthony1256's user avatar
2 votes
1 answer
207 views

Low power circuit design for turning an LDO on/off at specific voltage levels

I am designing a low power circuit that uses the TPS61023DRLR for energy harvesting, charging a 1.5F ...
enwi's user avatar
  • 77
0 votes
1 answer
52 views

Battery voltage monitor even if it is charging

I am working on a project and I want to add a battery voltage monitoring feature to it. The battery is 3.7 V and I want to monitor its voltage level with the ADC even if it is charging. The main ...
Waqas Ahmad's user avatar
0 votes
1 answer
99 views

Monitoring 24V LED stack tower lights status

I am working on a project based on Arduino, but currently stuck. I have three 24V lights to monitor, sent by a tower wired to a machine. My idea is to use a relay to convert first 24 voltage to 5V, so ...
user avatar
0 votes
3 answers
135 views

Design for 110 V brownout detector

I suspect that a power circuit in my home has an intermittent connection somewhere, and I'd like to test this to be sure (because if I'm wrong, then the equipment running on that circuit needs to be ...
Toby Eggitt's user avatar
0 votes
1 answer
65 views

Need to monitor an SSR with an arduino

I need to monitor the coil side of an SSR (not actually a coil I know). The problem with my circuit is it allows enough current through the resistor divider to 0V to actually turn on the SSR. Just ...
SyntaxError's user avatar
0 votes
0 answers
27 views

Query regarding MAX20480DATEJ/VY+ voltage monitor

I'm using a MAX20480DATEJ/VY+ voltage monitor for my design. Out of four inputs, I prefer to set IN1 2.5V at the same time for testing purposes. When I'm running my command, I'm constantly getting a ...
Sam20's user avatar
  • 19
3 votes
1 answer
325 views

Differential op-amp battery cell monitor circuit odd behavior

I'm working on a three cell LIPO battery cell voltage monitor using three differential op-amps. I had the circuit I designed below printed on a PCB and have assembled the board, but I am getting ...
incorrect_department's user avatar
6 votes
1 answer
666 views

Can you monitor the state of charge of lead-acid batteries through their terminal voltage if they're being used?

Lead-acid batteries have -approximately- linear discharge curves and are therefore more easily monitored through their open-circuit voltage. Is there a way to monitor their SoC without disconnecting ...
A.H.Z's user avatar
  • 633
1 vote
1 answer
87 views

Varying DC pass only over set threshold (LM358)

First timer here (microcontroller hobbyist). I need to let voltage pass from battery to step down converter only when voltage exceeds set threshold. There's some MCU stuff behind the 5V step down ...
sakabug's user avatar
  • 163
0 votes
1 answer
78 views

Monitoring circuit for the switching voltage

I would like to monitor the switching voltage which is switching between 24V and ground at a frequency of 100kHz. If the voltage is below 21V, then generate a reset signal. The lines are the ...
IamDp's user avatar
  • 1,885
1 vote
0 answers
88 views

Monitoring PWM Solar System

I want to try and make a power monitoring system for an off-grid solar system using a micro-controller (esp8266). I started by monitoring the battery voltage (using a voltage divider and an ADS1115) ...
Sahar Cohen's user avatar
0 votes
0 answers
53 views

What can cause these strange AC current and power readings?

We are attempting to monitor the power usage for a customer using a commercial digital power meter and Rogowski coils. In one of the panels (3 phase 208/120) the current measurements are very ...
crj11's user avatar
  • 5,606
0 votes
2 answers
230 views

Adding Hysteresis to Supply Voltage Supervisor

I am going through this TI-APP note - Voltage Supervisor,with hysteresis. I am not able to understand WHY they have derived the below equation 1 & equation 2 in the App note (page 2 & page 3)...
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