bird PIEZO SYSTEMS, INC.
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PIEZO LINEAR AMPLIFIER



EPA-104 Linear Amplifier
Print this Page: from © Piezo Systems, CATALOG #8 (2011),  page 4 & 5. pdf icon



Part Number:
EPA-104-115
(115VAC / 60HZ)
Price
Part Number:
EPA-104-230
(230VAC / 50HZ)
Price
ROHS:
Compliant
Description:The EPA-104 is a high voltage (±200 Vp), high current (±200 mA), and high frequency (DC to 250 KHz) amplifier designed to drive higher capacitive (low impedance) loads, such as low voltage stacks, at moderate frequencies; or lower capacitive loads, such as ultrasonic devices, at high frequencies.

The ability of an amplifier to drive a piezoelectric device statically is determined by its voltage capability and stability. Its ability to drive a piezo device dynamically is determined by the capacitance of the actuator, the voltage to which it must be driven, and the number of times it must be charged and discharged per second. These establish the current, voltage, and frequency requirements of the amplifier.
FEATURES
Low electrical noise, low distortion: The EPA-104 is made with a high quality Apex ® High Voltage Hybrid Operational Amplifier, and utilizes high regulation linear power supplies. It is housed in a heavy high conductivity aluminum case which provides an excellent shield from external electromagnetic interference.

Input and Output Protection: Piezo loads present special problems to electronic drivers. Piezo Systems amplifiers provide heavy input and output protection to take care of all shorting, turn-on, turn-off, and load generated voltage occurrences which can damage either the amplifier or your actuator.

Manual Bias Controls (voltage polarity and DC offset): Useful for making manual adjustments of drive voltage to verify piezoelectric actuator static motion, for static settings, or for applying DC bias to dynamically driven piezo actuators such as piezoelectric stacks.

Input Control (via analog signal to the BNC input connector): Accepts up to ± 10 V signal waveforms from external signal generators, computer controllers, or feedback networks from DC to rated frequency. The combined AC plus DC offset voltage is adjustable from zero to the rated voltage.
ESTIMATING THE CURRENT REQUIREMENT OF A PIEZOELECTRIC ACTUATOR
To estimate the peak current requirement of a piezoelectric actuator, solve the appropriate equation:
Ipeak (in Amperes) = 2 π f C Vpeak
(driven with a sine wave)
Ipeak (in Amperes) = 4 f C Vpeak
(driven with a triangle wave)
Ipeak (in Amperes) = C dV / dt
(driven with a square wave)
Where f is the maximum operating frequency in Hertz, C is the capacitance of the piezoelectric device in Farads, dt is the square wave rise time, and Vp is maximum peak drive voltage. The amplifier must be able to supply Vp, lp and f.
SPECIFICATIONS     Values to be used as guidelines.
ELECTRICAL
  Maximum Voltage
  ± 200 volts peak
  Maximum Current
  ± 200 mA peak
  Output Power
  40 watts peak
  Frequency Range
  DC to 250 KHz
  Bandwidth

  Into 1 K ohm resistive load: Flat, DC to 300 KHz;   3db roll-off, 400 KHz;
  Into capacative load: see chart below.
  Voltage Gain
  Variable gain, adjustable from 0 to 20X
  Phase Shift
  -.083° per KHz,   typical
  Slew Rate (no load)
  380 volts / µsecond
  Maximum Input Voltage
  ± 10 volts peak
  Maximum DC Component
  ± 10 volts DC
  Input Coupling
  Direct DC coupling only
  Input Impedance
  10K ohm
  Output Coupling
  DC coupling
  Variable DC Offset
  Normally zero volts. Adjustable to ± 200 volts peak
  Load Impedance
  Capable of driving any load within the voltage and current limitations of the amplifier
  Output Noise (300 KHz bandwidth)
  2 mvrms with input shorted
  AC Power Source
  User settable: 100-130 VAC, 50/60 Hz; or 200-250 VAC, 50/60 Hz
  Circuit Protection
  Overload, short circuit and thermal protection.
MECHANICAL
  Front Panel Controls
  Gain adjust; DC Polarity selector (+, 0, -); DC offset adjust
  Rear Panel Controls
  On/off switch; Line voltage selector
  Terminals

  BNC for Input (ground referenced); safety shrouded banana jacks for high voltage output
  terminals (ground referenced)
  Weight
  6.4 kg (14 lbs)
  Dimensions

  12" (305mm) long x 12" (305mm) deep x 5" (127mm) high
PEAK VOLTAGE DELIVERED TO CAPACATIVE LOAD AT PEAK CURRENT RATING versus OPERATING FREQUENCY
Steady state sinusoidal waveforms,
Temperature = 25 ° C
volts vs freq
PRICING INFORMATION   USD each
Part Numbers
Description
Price
EPA-104-115
Piezo Linear Amplifier, ±200Vp/±200mA (115VAC/60Hz)
$2,903
EPA-104-230
Piezo Linear Amplifier, ±200Vp/±200mA (230VAC/50Hz)
$2,903
EPA-104-BPRB
Retractile Banana Plugs (with safety sheath); 1 Red, 1 Black
$59