Table of Contents : - Physik Instrumente
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1. converters External synchronization lines are provided for this purpose The PCB layout should allow for voltage levels which can be as high as 170 V between neighboring pins and up to 130 V from ground This requires sufficient air gaps depending on the application environment Power Supplies The E 831 requires voltages of 15 V 26 V and 127 V To prevent the customer from having to generate such untypical voltages PI offers suitable power supply modules which are similar in size and format to the E 831 While for low noise high resolution applications linear power supplies are easier to design most applications require smaller packages and low power losses Piezo actuators for mechanical and electrical reasons are not able to generate mechanical noise at higher frequencies Therefore power with switching frequency noise of 100 kHz is still suitable for high resolution piezo positioning even though the electrical signal itself might not qualify as low noise Release 1 4 3 info pi ws Page 6 PI E 831 Single Channel LVPZT Amplifier User Manual PZ 151E Care should be taken if the system includes sensors with AC excitation or data sampling If the different clock signals or their harmonics have frequencies relatively close together their beat frequency can appear as noise The solution PI provides is to make possible synchronization of the power supply with an external clock In complex systems or when the master clock i2. Description Block Diagram CONTROL IN HU_QUT aa tl ZV 20 1204 TEMP OFL MONITOR 5U TTL igo 1 PIEZO AGND E 831_02 PGND GND 15U Supply Input 15 26V 127VU E 831 Schematic diagram GND AGND and PGND lines are connected inside the module For best performance supply voltages should be generated by a linear power supply This allows taking full advantage of the excellent noise level of the amplifier module If for space and power reasons a switched supply must be used the one of the companion E 841 or E 842 modules is recommended Naturally the switching frequency will appear in power supply and amplifier output but at switching frequencies of 100 kHz the piezo actuator is not able to follow so that the resulting motion has much less noise than the driving voltage This has to be considered if resolution is to be specified by measuring the piezo voltage Especially with digital oscilloscopes the measurement shows unrealistically high noise levels The only real way is to measure the resulting motion with optical methods or other high resolution high bandwidth sensors One possible problem with switched supplies is that the high frequencies can interact with other high frequencies in the system to generate lower frequency noise that the actuator can follow The solution is to synchronize the switching clock with the other system clocks for example sensor excitation signals and sampling clocks for AD and DA
3. Piezo Nano Positioning PI PZ 151E User Manual E 8093 11 LVPZT Amplifier Modules Release 1 4 3 Date 2007 01 31 This document describes the following Product s E E 831 02 Single Channel Low Power Amplifier Module for LVPZTs FEITEN Physik Instrumente PI GmbH amp Co KG Auf der R merstr 1 76228 Karlsruhe Germany Tel 49 721 4846 0 Fax 49 721 4846 299 Moving the NanoWorld www pi ws info pi ws www pi ws PI E 831 Single Channel LVPZT Amplifier User Manual PZ 151E Table of Contents 0 Manufacturer Declarations c scesceseeeeeneeneeneenseneens 3 0 1 EAE 110 ANENE Ree Ree oe eter re OEE NY Menke arn EAN 3 0 2 Warnings and Safety Notices ccccccceccceeeceeeeeeeeeseeeseeeeeeeees 3 1 UU OGUGUION onssas E A 4 2 Operating Principle sssassnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 5 3 Amplifier Description ccccsccesssssseeeseeeseeeaseeneeeeseeeneoees 6 3 1 BIOCk DiagraMi essing E ext aateaanwesteeas 6 9 2 OWE SUD DIGS 3 inene a 6 4 TECHNICA Dale ar a 7 5 Pin PAS SIGMIMG PN sic seoe sccebece sesece se casscecs ass secs secs tecestocasensiecasss 8 6 DIMENSIONS okere eee erase ore R O Aaaa a 8 Copyright 2007 by Physik Instrumente PI GmbH amp Co KG Release 1 4 3 File E 831_02 User _PZ151E143 doc 198144 Bytes Release 1 4 3 info pi ws Page 2 PI 0 1 0 2 E 831 Single Channel LVPZT Amplif
4. fier User Manual PZ 151E Warning High Voltage Can Cause Injury The PZT driver described in this document is power amplifier that outputs voltages of up to 120 V and may cause serious injury High voltages can even be present on internally used undocumented pins labeled NC or RSVD When using PZT translators with bare contacts or non isolated cases do not touch the metallic surfaces All work done with and on the devices described here requires adequate knowledge and training in handling High Voltages Any cabling or connectors used with the system must meet the local safety requirements for the voltages and currents carried Even if the PZT is not connected to the driver the ceramic may be charged up to high voltage When working with these devices or using PZT products from other manufacturers we strongly advise you to follow general accident prevention regulations Operating Principle Low voltage PZTs can be driven with an extended voltage range of 20 V to 120 V This range can be fully covered by the E 831 Piezo actuators are toa first approximation capacitors which means the current flow depends on the frequency of operation or more generally the slew rate of a changing signal In Static operation almost no power will be needed E 831 amplifier modules can be used for applications requiring a signal amplifier The operation mode is that of a power amplifier with a fixed gain of 10 This means for an output
5. freqUeNCy ccccssseeeeeeeeeeeeeeees 3 5 kHz no load FRIDDIC QUIDUL wiecsccetiet een herein lt 1 mVpp linear power supply 1 8 uF load at the output A EE E een ee A er E een A 20 mVpp switched power supply Operating temperature range 6 5 to 50 Celsius ASS E A A EE A E N Metal shielded casing size 50 x 30 x 14 mm Soldering pins 2s sociecatescses os ees ec 1 mm diameter 4 mm length Release 1 4 3 info pi ws Page 7 PI 38 58 Fas pera 14 88 E 831 Single Channel LVPZT Amplifier Pin Assignment Pin 1 Pin 2 Pin 3 Pin 4 Top View Pin 5 Pin 6 Pin 7 123 4 Pin 8 ae a Pin 9 gon SEG Pin 10 26 Pin 11 Dimensions Decimal places separated by commas in drawings 50 00 User Manual PZ 151E Analog GND Temperature Overload Signal Control Input 2 to 12 V High Voltage Output 20 V to 120 V for LVPZT Output Monitor 1 100 PGND LVPZT GND Supply Voltage 127 V Supply Voltage 26 V Supply Voltage 15 V Supply Voltage 15 V Supply Voltage GND Heat sink mounting holes on top heat sink not offered by PI Release 1 4 3 info pi ws Page 8
6. ier User Manual PZ 151E Manufacturer Declarations Certification Physik Instrumente PI GmbH amp Co KG certifies that this product met its published specifications at the time of shipment Warnings and Safety Notices Warning High Voltage Can Cause Injury The PZT driver described in this document is power amplifier that outputs voltages of up to 120 V and may cause serious injury High voltages can even be present on internally used undocumented pins labeled NC or RSVD When using PZT translators with bare contacts or non isolated cases do not touch the metallic surfaces All work done with and on the devices described here requires adequate knowledge and training in handling High Voltages Any cabling or connectors used with the system must meet the local safety requirements for the voltages and currents carried Even if the PZT is not connected to the driver the ceramic may be charged up to high voltage When working with these devices or using PZT products from other manufacturers we strongly advise you to follow general accident prevention regulations Caution No Overvoltage Polarity or ESD Protection Overvoltage or reversed polarity at the supply pins will destroy the module No limiting components are included ESD can also damage the circuit The customer has to handle the module with the typical safety rules valid for other electronic components Release 1 4 3 info pi ws Page 3 PI E 831 Si
7. ngle Channel LVPZT Amplifier User Manual PZ 151E Introduction The E 831 LVPZT amplifier is a single channel amplifier for driving low voltage piezoelectric translators LVPZTs It is an OEM module for PCB printed circuit board mounting and can be used as a one or two component amplifier for LVPZTs The E 831 02 amplifier is a highly compact but complete driver for LVPZTs having an average output power of about 2 W without heat sink and 5 W with external heat sink Because the power consumption of a piezoelectric translator depends on the operating frequency and displacement amplitude static or quasi static operation can be controlled by such a low cost low power amplifier E 831s require several different voltages for operation including 127 VDC All required voltages can be supplied by either the E 841 or E 842 power supply modules which are in packages similar to the E 831 and run on single DC sources See the corresponding user manuals for more information Product Features gt Designed for PCB mounting Low cost Small footprint Low noise Easy to use No external components Internal or external clocking Low profile High stability Fully stable for capacitive loads Fully overcurrent short circuit and temperature protected For small loads operates without heat sink Vv Vv Y Y Y Y Y Y VW VW V YV Powers up and down without voltage spikes Release 1 4 3 info pi ws Page 4 PI E 831 Single Channel LVPZT Ampli
8. s much higher and the various frequencies are made by dividers more sophisticated synchronization circuits are sometimes necessary This is because the phase shift of different dividers can affect precision and stability See the E 841 E 842 User Manual for detailed information on these modules Technical Data T OT cess E 831 02 FUNCION acaso o leet es LVPZT amplifier module Operating voltages cceeceesseeeeeeeeeeees 15 V 20 mA 14 to 16 V all currents without dynamic loadq 15 V 7 mA 14 to 16 V PEE E nate 127 V 1 8 mA 125 to 135 V EE E E N E EN 26 V 1 8 mA 24 to 30 V Output voltage SWING ccceceseeeeeeeeeeees U 6 V 121 V for U 127 V shi de cles E E A ae A U 8 V 20 V for U_ 28 V CSAs ies cs cee ee cee cee 10 0 1 Max output current ceceeeeeeeeeeeeeees 100 mA 8 ms sink source Max average current cccceeeeeeeeeeneeees 50 mA 2 min without heat sink Output protection cceccceeeeeseeeeeeeeeees short circuit protected the module is overload protected to 70 C case temperature Max Output power cccceeceeeeseeeeeeeeees 2 W without ext heat sink 5 W with ext heat sink or forced airflow Control input range ccccseeeeeseeeeeeeeees 2 to 12 V Input impedance cccccseeeeseeseeeeeeees 100 kO Dynamic current requirements depending on load amplitude and slew rate Cut off
9. voltage swing of 20 to 120 V at the HV OUT pin the control voltage at the CONTROL IN pin has to run from 2 to 12 V The output is fully compensated for capacitive loads from 0 uF E 831 or 0 5 uF E 832 to 10 UF which is the typical range of PI s low voltage piezo actuators E 831 small signal bandwidth is about 3 KHz The output is subjected to 2 current limits for short periods it can provide up to 100 mA but the long term limit is 50 mA This allows to load a capacitor relatively fast but still makes the output circuit short circuit safe without time limitation In the case temperature exceeds 70 C can be reached after a few minutes with maximum current an internal sensor will shut down the output stage until the temperature is below 60 C This condition is signaled by a status line called TEMP OFL TEMP OFL has 0 V for normal operation and 5 V for the over temperature condition during which HV OUT is 0 V The MONITOR output provides a voltage signal internally divided to 1 100th of HV OUT Caution No Overvoltage Polarity or ESD Protection Overvoltage or reversed polarity at the supply pins will destroy the module No limiting components are included ESD can also damage the circuit The customer has to handle the module with the typical safety rules valid for other electronic components Release 1 4 3 info pi ws Page 5 PI 3 3 1 3 2 E 831 Single Channel LVPZT Amplifier User Manual PZ 151E Amplifier
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