Need schematic to build a piezo driver 0-150v  - Page 1
Forum section: electronics / projects

author: fluorescent
author_rank: Newbie
timestamp: December 31, 2017, 09:47:46 pm
content: Hi all cracks here, i want to build a piezo driver to control a automative piezoelectric injector .Here some info:High voltage drive 160VPulse width 160µS÷2000µS with 50µS stepsInjector drive frequency 3.33Hz÷40Hz (default is 16.6Hz)Maximum piezo injectors drive current 15AResistance measurement 0.05ohms÷10ohmsInductance measurement 10µH÷10mH

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 31, 2017, 11:07:37 pm
content: Just hack a cheap power inverter.

author: Zero999
author_rank: Super Contributor
timestamp: January 01, 2018, 11:43:45 am
content: You need a full bridge MOSFET gate driver (or two half bridges). There are plenty of ICs which will do this. Here's a list of links I got from Googling 200V MOSFET bridge driver. Because you're using a much lower frequency, than is typically used for most inverters and motor PWM controllers, you'll need to use much larger bootstrap capacitors, or use a driver which requires an isolated high side gate drive voltage, so it will work at DC.https://www.semicon.sanken-ele.co.jp/sk_content/sma2404m_ds_en.pdfhttps://www.intersil.com/content/dam/Intersil/documents/an90/an9010.pdfhttp://www.st.com/content/ccc/resource/technical/document/application_note/09/e6/1b/f4/72/7a/43/81/CD00200596.pdf/files/CD00200596.pdf/jcr:content/translations/en.CD00200596.pdfhttp://datasheet.octopart.com/MD7120K6-G-Supertex-datasheet-11966372.pdfhttps://cdn.anaren.com/product-documents/MSK/DiscontinuedProducts/bridges-gate-drive/MSK4227_DataSheet(Rev_E).pdfhttp://www.ti.com/lit/ds/symlink/ucc27714.pdfhttps://www.infineon.com/dgdl/irs2110.pdf?fileId=5546d462533600a40153567660ff27b0https://www.infineon.com/dgdl/an-978.pdf?fileId=5546d462533600a40153559f7cf21200

author: fluorescent
author_rank: Newbie
timestamp: January 01, 2018, 03:15:59 pm
content: You have some schematic with that CI that you provide?Sorry i am very green in this.

author: Zero999
author_rank: Super Contributor
timestamp: January 01, 2018, 06:13:36 pm
content: Quote from: fluorescent on January 01, 2018, 03:15:59 pmI don't have a schematic. Read though the data sheets I linked to. They all contain example schematics showing how the devices are used. Have a look at what's available via your local electronic component distributor and decide on an IC.The schematic is often only half the story. The PCB layout will also be very important, given the high current and fast switching times. I appreciate this is daunting.

author: fluorescent
author_rank: Newbie
timestamp: January 01, 2018, 09:26:17 pm
content: i found this what do you think?https://mega.nz/#!jEo3gTCJ!Pn4DxXqjhjkl-_VDkSSEGVIWOP04tLhMxhBYMJFaAjI

author: ace1903
author_rank: Regular Contributor
timestamp: January 02, 2018, 12:05:45 am
content: Isn't driver already incorporated into injector?It is strange if driving signal is from outside. I haven't experience in car electronics but think if suchsignal runs trough cables will be huge source for interference. I would expect that gnd +12v and trigger to be from outside.Have opened several different ECUs and haven't found ultrasonic pulsers in them.It is better to re-purpose existing electronics from demolished injector/ecu instead of designing new one.Try to cut open some spare and dissect it.

author: fluorescent
author_rank: Newbie
timestamp: January 05, 2018, 10:24:03 pm
content: I talk about piezo injectors made by Siemens or Continental, Bosch. They need a control driver unit to test it out of car.I need such a driver unit to simulate the ECU pulse and frequency.

author: Zero999
author_rank: Super Contributor
timestamp: January 06, 2018, 04:43:59 pm
content: Quote from: fluorescent on January 01, 2018, 09:26:17 pmLooks sensible to me.EDIT:The output current rating is only 1.5A, so is no good on its own.

author: ace1903
author_rank: Regular Contributor
timestamp: January 06, 2018, 07:20:00 pm
content: Sorry but I can't see what is your idea. Do you need do evaluate some injector for future use in cars or industrial equipment?Or you need to make some kind of test equipment to be used in home garage or small car service?First would need careful design with precise trimmings that would work over whole temperature range and over voltage noise condition present in car wiring loom.For that voltage/current rating I think that solution must be with discrete MOSFETs. TI and Microchip have mosfet driver chips that can be used and I have used them in my gas flow metering design.If you need quick check if some injector taken out form car works that's completely different design objective.