Current sense amplifier basics of marketing
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Current sense amplifier basics of marketing
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Content:
- Current Monitors Master Table
- AN-105: Current Sense Circuit Collection Making Sense of Current
- AS8525 LIN IC
- Crestron Next Road Trip
- Secrets of Measuring Currents Above 50 Amps
- Understanding current sense amplifier data sheets to maximize safety system design margins
- Smart, Connected, Secure Solutions for ADAS Applications
- Are Chinese Celebrities Still Crucial For Luxury Brands?
- US7327149B2 - Bi-directional MOS current sense circuit - Google Patents
- Bryston 14b3 review
Current Monitors Master Table
By Steve Bush 5th November Trying to get a circuit to sense its own current consumption can be a little tricky. That said, there are plenty of specialist three and four terminal chips that will sense across a resistor in the positive rail and transfer that to a oV-referenced voltage or current. The one on the left ends up referenced to the top of the sense resistor, and so needs this to be taken into account see the equation. Well, it could be, if….
However, as far as I can see, if the voltage drop across the sense resistor can never be greater than, say, 0. The inputs of the op-amp will now sometimes be outside 0V to Vcc, but there are many op-amps with pnp or p-channel inputs that can effortlessly cope with this. If this indeed works, then a simpler version would be the circuit on the right here, which also has capacitor in the feedback loop for output signal smoothing, and a split input resistor so that a capacitor can be introduced to short-out or average signals outside the bandwidth of the op-amp — preventing out-of-band signals messing with the op-amp inputs.
If a circuit with no gain can be tolerated, and even a 2x loss can be tolerated, then Mr Wheatstone or Mr Christie can come to your rescue with the circuit on the left.
Given that Mr Thevenin and Mr von Helmholtz also speaks from the depths of history, it is possible to sort out the loading effect of the op-amp input resistors on the bridge, as well as save a couple of resistors, by distributing the input resistors as the bridge resistors unless I am once again being an idiot. It might work with the bridge circuit version…? Maybe figure out the typical current draw and add that constant amount into the signal somehow?
Maybe I should try it in LTspice — though I similarly fear that it would not like the unconventional input voltage. My fear on having the -ve supply in the more negative end of the sense resietor was less to do with measuring op-amp current and more do do with wanting to use a quad op-amp and use the other parts elsewhere — and also that, in my appliaction, the op-amp would get a lot of kHz energy injected into its -ve supply lead.
As always, the datasheet would be the first thing to check. Some are happy to have inputs that go outside of the supply range. Mostly, though, I view having inputs that are beyond the supply rails as the equivalent of the old maps that show the oceans ending abruptly and with some warning about dragons existing beyond that point.
Hi MrK. I have indeed checked the data sheets of several parts and the scheme seems to obey the rules — although I might be mis-reading them. Dear Steve, Thanks for the circuit discussion. I am also stuck with this circuit and it is not working. I am also using a Quad MCP on 3.
Did you wire it up and test it out? I tried a separate MCP op amp. This also did not work. May be the differential amp concept will not work. The single ended op amp might do the trick.
Alternatively we can try out op amp buffers inserted between the sense resistor and the differential amp to overcome the inputs going over the boundaries. Look forward to hearing from you! Please write to. Your email address will not be published.
By using this website you are consenting to the use of cookies. Electronics Weekly is owned by Metropolis International Group Limited, a member of the Metropolis Group; you can view our privacy and cookies policy here. Home » Blogs » Engineer In Wonderland. Sensible ground current sensing — or am I an idiot?
But for the sake of argument, how about sensing across resistors in the negative rail? The one on the right is a ground-referenced differential amplifier.
Engineer or idiot However, as far as I can see, if the voltage drop across the sense resistor can never be greater than, say, 0. Steve Bush. Get Electronics Weekly every day Subscribe.
Steve Kurt 15th November at am. Steve Bush 15th November at pm. Can you think if a reason why it would not work? Steve Kurt 20th November at pm. Steve Bush 20th November at pm. Ramakrishnan 7th June at pm. Leave a Reply Cancel reply Your email address will not be published.
AN-105: Current Sense Circuit Collection Making Sense of Current
This Application Note compiles solutions to current sensing problems and organizes the solutions by general application type. These circuits have been culled from a variety of Linear Technology documents. Each chapter collects together applications that tend to solve a similar general problem, such as high side current sensing, or negative supply sensing. The chapters are titled accordingly. In this way, the reader has access to many possible solutions to a particular problem in one place. It is unlikely that any particular circuit shown will exactly meet the requirements for a specific design, but the suggestion of many circuit techniques and devices should prove useful.
AS8525 LIN IC
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Crestron Next Road Trip
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Secrets of Measuring Currents Above 50 Amps
Amplifiers and Comparators Minimize menu. Please log in to show your saved searches. ST's current sense amplifier IC portfolio offers a large variety of high-performance devices. Current sensing solutions add valuable safety and protection features to system designs. They provide information to control current in power systems and avoid overheating and short circuits. Current sensing is also an essential part of energy metering to ensure power-efficiency and minimize environmental impact.
Understanding current sense amplifier data sheets to maximize safety system design margins
Download PDF Version. It can be challenging to sense currents exceeding 50 A because the task often involves thermal management, must take place in a limited PCB area, and in some cases, requires a voltage isolation device. It is useful to compare these two techniques. Measuring on the high-side brings immunity to ground bounces and allows for the detection of short circuits to ground. Depending on the supply voltage and the application, basic or reinforced isolation might be needed for sense-circuit connections. To provide isolation, additional isolators such as optocouplers and isolated power supplies will be needed, increasing complexity and boosting costs. On the other hand, Hall-effect current sensor ICs, such as those provided by Allegro, eliminate the need for a sense resistor. The current flows directly into the integrated conductor, generating a magnetic field that will be measured.
Smart, Connected, Secure Solutions for ADAS Applications
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Are Chinese Celebrities Still Crucial For Luxury Brands?
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US7327149B2 - Bi-directional MOS current sense circuit - Google Patents
Complete study of the global Current Sense Amplifiers market is carried out by the analysts in this report, taking into consideration key factors like drivers, challenges, recent trends, opportunities, advancements, and competitive landscape. This report offers a clear understanding of the present as well as future scenario of the global Current Sense Amplifiers industry. They have also provided accurate data on Current Sense Amplifiers production, capacity, price, cost, margin, and revenue to help the players gain a clear understanding into the overall existing and future market situation. High-impact rendering factors and drivers have been studied in this report to aid the readers to understand the general development. Moreover, the report includes restraints and challenges that may act as stumbling blocks on the way of the players.
Bryston 14b3 review
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