Selection chart of High Voltage Amplifiers

High Voltage Amplifiers

Models with the fastest slew rate of 1,200 V/µs or compact modules for built-in use are available. Those series produce high voltage output in sine waves, triangle waves, sawtooth waves, square waves, and more.

Series		AMJ	AMS	AMT	AMP	AMPS	COR	HOPH	AP	AS
Output Power		20 to 40 W	20 W, 30 W	60 W, 100 W	100 to 1200 W	400 to 1200 W	20 W	5 W	3 to 10 W	3 to 10 W
Frequency response (Fastest model bandwidth)		DC to 75 kHz (-3 dB)	DC to 2 kHz (-3 dB)	DC to 100 kHz (-3 dB)	DC to 40 kHz (-3 dB)	DC to 200 kHz (-1 dB)	DC to 1 kHz (-3 dB)	DC to 2 kHz (-3 dB)	DC to 3 kHz (-3 dB)	DC to 25 kHz (-3 dB)
Slew rate		150 V/µs	30 V/µs	250 V/µs, 360V/µs	Up to 700 V/µs	Up to 1200 V/µs	30 V/µs	40 V/µs	-	12 V/µs or more
Output Voltage	0.3 kV								±0.3 kV	±0.3 kV
	0.5 kV	±0.5 kV
	0.6 kV			±0.6 kV	±0.6 kV	±0.6 kV			±0.6 kV	±0.6 kV
	1 kV	±1 kV		±1 kV	±1 kV				±1 kV	±1 kV
	1.5 kV			±1.5 kV					±1.5 kV	±1.5 kV
	2 kV	±2 kV			±2 kV	±2 kV
	3 kV			±3 kV					±3 kV	±3 kV
	4 kV	±4 kV
	5 kV		±5 kV	±5 kV	±5 kV	±5 kV		±5 kV	5 kV (Unipolar only)
	10 kV		±10 kV	±10 kV	±10 kV	±10 kV	±10 kV		10 kV (Unipolar only)
	20 kV				±20 kV	±20 kV
	30 kV				±30 kV	±30 kV
	40 kV				±40 kV
Features	Wave form	Various types of output waveforms	Various types of output waveforms according to the input wave	Various types of output waveforms according to the input wave				Desired output waveform reference to the input waveform.	Desired output waveform reference to the input waveform.	Desired output waveform reference to the input waveform.
	DC bias function	DC bias function	DC bias function	DC bias function
	DC output voltage monitor	DC output voltage monitor, 3.5-digit digital meter	DC output voltage monitor, 3.5-digit digital meter	DC output voltage monitor, 3.5-digit digital meter
	Other				The demand for evaluation of higher voltage solar panel		Three functions of CC, CV, and HV amplifier in one unit		All-Solid-State	All-Solid-State
	Other						Return current terminal is standard and best for corona current control
Ripple		Less than 0.1%	0.1% p-p or less	0.02% + 1 Vp-p or less	Less than 0.02% + 1 Vp-p	Less than 0.02% + 0.5 Vp-p	0.1% p-p or less	≦10 Vrms	0.025% rms or less	0.025% rms or less
Applications	Electro photography process	Electro photography process	Electro photography process	Electro photography process	Electro photography process	Electro photography process	Research and Development of electrophotographic process	Electro photography process	Electro photography process	Electro photography process
	Corona discharge	Corona discharge	Corona discharge	Corona discharge	Corona discharge		Experiment of corona discharge	Corona discharge	Corona discharge	Corona discharge
	Beam deflection	Beam deflection	Beam deflection	Beam deflection	Beam deflection	Beam deflection		Beam deflection	Beam deflection	Beam deflection
	Electrorheological fluid	Electrorheological fluid	Electrorheological fluid	Electrorheological fluid	Electrorheological fluid			Electrorheological fluid	Electrorheological fluid	Electrorheological fluid
	Electrostatic chuck	Electrostatic chuck	Electrostatic chuck	Electrostatic chuck	Electrostatic chuck			Electrostatic chuck	Electrostatic chuck	Electrostatic chuck
	Various Electrostatic tests	Various Electrostatic tests	Various Electrostatic tests	Various Electrostatic tests	Various Electrostatic tests	Various Electrostatic tests		Various Electrostatic tests	Various Electrostatic tests	Various Electrostatic tests
	Other test	Breakdown voltage testing	Breakdown voltage testing	Breakdown voltage testing	Breakdown voltage testing		Photosensitive drum testing	Insulation and breakdown voltage testing	Insulation and breakdown voltage testing	Insulation and breakdown voltage testing
Series		AMJ	AMS	AMT	AMP	AMPS	COR	HOPH	AP	AS

High Voltage Pulse Power Supplies

The below pulse power supplies are ideal for ion beam deflection, synchrotron radiation measurement, PMT and MCP.

Series	SK	SKS
0.3 kV	0.3 kV
0.4 kV	0.4 kV
0.5 kV	0.5 kV
1 kV	1 kV
2 kV	2 kV
5 kV	5 kV
10 kV	10 kV	10 kV
Output current	20 mA ave.	10 mA ave.
Pulse repetition frequency, PRF	10 kHz max	50 kHz max
Rise/fall time	15 ns	20 ns

What is a Bipolar Power Supply? (Basic Knowledge)

High Voltage Amplifier

High voltage amplifier converts the input voltage to high voltage waveform as it is as shown in Fig. 1. These days, the demand for HV amplifiers is growing more and more, and now becoming an indispensable tool for research and development, experiments and integrating to a system for such fields as electronics, physics, biochemical and medical industries. With high-voltage technologies, Matsusada Precision Inc. manufactures various high-voltage amplifiers to meet all customers' requirements.

* We have amplifiers developed especially for electrostatic chuck or PZT. Please ask for details to our sales staff.

This is the image of a circuit to amplify the input signal. — (fig. 1)

Four-quadrant Output Range

High Voltage amplifier is generally equipped with the "sink" function for output currents that provides constant voltage operation without regard to the type of load, whether it is capacitive or conductive. (Fig.2) As it gives a fast response, it is an ideal power supply for applications that require AC output.

Matsusada High Voltage amplifiers are all bipolar type and can be operated in a full four-quadrant area. (I, II, III, IV area)

Vomax: Rated output voltage
Iomax: Rated output current

A graph of DC and AC Operating range. — (fig. 2) Voltage and Current operation range

Slew Rate

The responsivity of our high-speed amplifier is determined by slew rate (SR). The step responsivity of our amplifier is shown in Fig. 3.

SR = ΔV/μS

In case the output amplitude is smaller, the response time becomes shorter. AMP series reach to greater than SR =700 V/µs at maximum.

This graph explains slew rate. It is defined as the amount of voltage change per unit time for an input signal. — (fig. 3)

Rise Time (step response)

Step response can be indicated with rise time. (fig.4) Usually, the rise time of the amplifier of response (= bandwidth) fc (Hz) is given in the formula below.

tr ≒ 0.35/fc.

The fall time tf is equal to tr.

This image explains rise time. — (fig. 4)

Frequency Response

Response of Matsusada amplifiers is described as "frequency bandwidth". When swinging the output with a sinusoidal waveform with rated resistive load, output swing (amplitude) is reduced as input frequency becomes faster. The frequency response in the specification is the frequency fc, where the output swing is 70% (-3 dB). (Fig. 5)
In case a clear output waveform is required, please select a High Voltage amplifier that has high enough frequency bandwidth against the required frequency. In general, three to five times more frequency bandwidth is required for the sinusoidal waveform and about 10 times more for the rectangular waveform. In case of insufficient frequency bandwidth, the output swing shall be reduced, and also the phase difference will be large, so some solutions, such as monitoring output waveform, shall be required.

* Please avoid continuous inputting of a high-frequency signal, which reduces the output frequency of an amplifier. An amplifier will be broken because of an increase in internal loss.

This graph explains response speed which is defined in the frequency band. — (fig. 5) Declination of output swing by frequency

Capacitive Load

When a capacitive load is more than 100 pF (including a stray capacitance of output wire), the resonance in the output may occur. In that case, install 100 Ω (at 0.1 μF) to 1000 Ω (at 1000 pF) of high-voltage resistance in the output in series. Please note that the frequency band is limited when using an amplifier with a capacitive load, as shown in the formula on the right.
In addition, when an amplifier is used for a corona discharge, a current higher than its rating will flow, and it will affect the amplifier badly. In this case, as well as when using an amplifier with a capacitive load, please install the output resistance and limit the current.

* Please avoid continuous input of the high-frequency signal, which reduces the output frequency of an amplifier. An amplifier will break because of an increase in internal loss.

This image explains frequency band when a capacitive load is connected.

Important note to utilize the full performance of high-speed High Voltage amplifier

Output cable of High Voltage amplifiers is not shielded. Suppose the output cable has some stray capacity against the ground (earth ground or metal objects). In that case, the output voltage will be sinusoidal or stop waveform, and extra current will be drawn. As this current draws parallel to the load, the following appearance might be happened.

Slew rate or response frequency drop
The waveform is distorted or changed

A conceptual diagram of leakage current of High Voltage amplifier.

Solution

Make sure to have proper connection to make stray capacitance of High Voltage cable as low as possible.

Keep the length of the output cable as short as possible.
Keep the output cable away from floor, desks, or metal objects.
Have no shielding on the output cable.

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