Timeline for Sensing voltage drop across the load in the H bridge
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 22, 2021 at 22:55 | answer | added | bobflux | timeline score: 2 | |
| Aug 22, 2021 at 9:55 | answer | added | Andy aka | timeline score: 2 | |
| Aug 22, 2021 at 9:52 | answer | added | Marko Buršič | timeline score: 2 | |
| Aug 22, 2021 at 9:44 | comment | added | Andy aka | @BerkerIşık OK fair enough. If it's an academic study that's different!! | |
| Aug 22, 2021 at 9:23 | comment | added | Berker Işık | This circuit will be part of a academic paper. It will also cover the effect constanly direction changing of current like AC manner to mechanical parameters. Do you think there's no effect on mechanical parameters of wire, right? But that's not the point. | |
| Aug 22, 2021 at 9:15 | comment | added | Andy aka | @BerkerIşık why should current direction be of any significance when restoring the shape of an SMA? | |
| Aug 22, 2021 at 9:08 | comment | added | Marko Buršič | To detect this resistance, you would need a DC constant current driver (very flat) a shunt and two very accurate ADCs, for example 24bit sigma delta. All of the components have to be very precise and low TCR. | |
| Aug 22, 2021 at 9:06 | comment | added | Berker Işık | @Andyaka I can do it using single MOSFET as you said. I use full bridge to change the current direction possible use cases in future . | |
| Aug 22, 2021 at 8:57 | comment | added | Andy aka | @BerkerIşık Why are you using a H-bridge to deliver power to your load. A half H-bridge appears to do what you want and, as a result you get one side of the load grounded making it much easier to determine the load voltage. In fact a single MOSFET appears to do what it seems that you need so why the driver complexity? | |
| Aug 22, 2021 at 8:45 | answer | added | tlfong01 | timeline score: -1 | |
| Aug 22, 2021 at 8:40 | comment | added | Berker Işık | I can also sense current flow using a Hside/Lside sensing topology like INA219. I know I can do it with single Mosfet but still need to measure voltage drop. | |
| Aug 22, 2021 at 8:39 | comment | added | tlfong01 | Well, just use a 4 digit DVM to do the job. Of course you can use a differential channel of a say, 24 bit ADC. Let me post a couple of pictures for reference in our discussion. Stay tuned. | |
| Aug 22, 2021 at 8:32 | comment | added | Marko Buršič | 1st) The BTN7970's current sense is not nearly accurate, 2nd) you don't need a H-Bridge, 3rd) If yo want to detect R change you have very low possibility even with most accurate ADC for voltage current. | |
| Aug 22, 2021 at 8:25 | comment | added | Berker Işık | To adjust the current flow i use H-bridgw with PWM. I need to measure resistance of the SMA wire. I know the current flow BTN7970 gives it's value. Using just simple V=IxR to get R value I need voltage dop. | |
| Aug 22, 2021 at 8:16 | comment | added | Marko Buršič | Why do you need a H-bridge for that? And what is the purpose of measuring the exact voltage? | |
| Aug 22, 2021 at 8:12 | history | asked | Berker Işık | CC BY-SA 4.0 |