Single and Double Channel Amplifiers HVA-1 and HVA-2 - Developed for use in Adaptive Optics and other high accuracy devices including piezo actuators.
HVA-1 and HVA-2 are single and double channel high voltage (HV) amplifiers respectively. HVA-2 has two identical fully separated channels. Each of the channels is a digital high efficient amplifier with class D output and it is intended for shaping a voltage on capacitive load and can be used either independently or in equipment controlled by a computer. The amplifier has 12 bit resolution and current limit and its HV outputs are open and short circuit protected. Maximum output voltage difference can be customized up to 800V, including bipolar or negative cases. Value of nominal load and current limit can be programmed by user.
Fields of application:
o Adaptive Optics
o Precise positioning (actuators, motors)
o Industrial automated systems (laser cutting, laser welding)
o Scientific use
o Education
- Typical frequency response of the amplifier at various amplitudes of output voltage.
C load = 3.5 uF, Current Limit - 80mA, DC offset 60V
Technical specification:
Parameter |
HVA-1 |
HVA-2 |
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Number of independent channels |
1 |
2 |
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Modes of operation |
from external analog or digital voltage source and synthesis of voltages also |
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Inputs |
- Analogue |
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Internally synthesized wave shapes |
- DC |
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Output voltage range, V |
0 - 120 |
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Nominal output voltage frequency at level of 3 dB (at output peak-to peak voltage 120 V, load capacitance of 3,5 μF and current limit of 80 mA), Hz |
0 – 100 (see diagram above) |
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Nominal output voltage frequency at level of 3 dB (at output peak-to peak voltage 120 V, load capacitance of 3,5 μF and and current limit of 185 mA), Hz |
0 – 200 |
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Range of programmable load capacitances, μF |
0.8 - 10 |
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Range of programmable current limits, mA |
0,33 - 430 |
0,22 – 290 |
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Output voltage setup step, V |
0,1 |
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Voltage setting accuracy, V |
± 0,08 |
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Output voltage noise, V |
<0,05 |
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Range of programmable output voltage rates of rise, kV/s |
6 - 50 |
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Internal control loop period, µs |
80 |
120 |
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Range of control voltages from external source, V |
0 - 4 |
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Amplification of control voltage from external source |
30 |
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Efficiency of amplifier (at output peak-to-peak voltage value of 120V, frequency of 100 Hz, load capacitance of 3,5 μF and current limit of 185 mA) |
no less 4,5
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Overall dimensions, mm |
93 x 35 x 20 |
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Weight |
max 0,040kg |
max 0,045kg |
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Software - The above units are delivered with a specialized software which can be run on PCs. We use specialized protocol Device Connect (DC) which allows multiple completely different devices to be operated simultaneously.
The Software is delivered on a compact disc, which comes with the unit, running under Windows XP or Windows 7. The Software consists of two packages: “SetupDC” and “SetupMD”.
The package “SetupDC” contains a set of programs supporting hardware-software protocol DC. The protocol DC functions in the physical network connecting channel amplifiers and their power supply. A USB-controller is used for communication with the PC and is part of the Multichannel Driver.
The set of programs supporting the protocol includes a USB DC driver, the “DCServer” and “DCClient” programs.
The USB driver provides data transfer via USB and it is initiated by the “DCServer” program. “DCServer” is designed to work with USB and the user’s client programs. “DCServer” is a DCOM application that runs as a service. The “DCServer” provides simultaneous operation of multiple user programs, and can be configured for serving a number of products, including physically different devices. The “DCServer” uses a IDCMsgExt interface.
The DCClient eases the connection between the DCServer and User programs. It is performing buffering and batching of incoming and outgoing messages, thereby isolating the user program from the delays associated with the data exchange. It runs as in-process server in the context of user program. It has a number of supportive functions for creating messages.
The SetupMD package contains a MD731 program. The MD731 program is used to switch on/off the device, control its functionality, check input and output voltages, demonstrate the capabilities of the products based on DC protocol.
