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Home Electro-optics Avalanche Transistor-based Pockels Cell Drivers 6kV Q-switch Driver – HVSwitch6

6kV Q-switch Driver – HVSwitch6

Special Features

  • Avalanche-transistors based topology;
  • Positive High-Voltage Pulse, – «Switch-on Mode»;
  • Low-Voltage DC supply is required (5 ÷ 30 V);
  • Built-in High-Voltage Source;
  • High-Voltage adjustment either directly on the board or remotely;
  • Possibility of applying external DC-biased source and Switch-off Mode;
  • “Error-message” signal if no high-voltage is detected;
  • LED Indicators;
  • TTL input signal required (3 ÷ 15V).

Applications

  • Generation of quazi-rectangular High Voltage Pulses with leading edge of nsec duration.
  • Control of electro-optical Qswitches (Pockel’s Cell) in a Solid-State Laser.
  • Can be used in Medical and Industrial laser equipment.

Technical Specifications

  • High-Voltage Amplitude ………………………………………………………….. 2000 ÷ 6000 V
  • HV Pulse-to-Pulse Instability …………………………………………………… 5%
  • Max Impulse Current ……………………………………………………………….. 30 A
  • Max Capacitance ……………………………………………………………………… 100 pF
  • Rising Front Duration ……………………………………………………………….. 3 ÷ 8 nsec
  • HV Pulsewidth (factory-set) ……………………………………………………… 0.2 ÷ 2 μsec
  • Falling Front Duration ………………………………………………………………. 0.2 ÷ 0.5 μsec
  • Max Repetition Rate (Frequency) ……………………………………………… 20 kHz
  • HV Pulse delay Vs. TTL trigger pulse ………………………………………… 60 nsec
  • TTL Signal Amplitude ……………………………………………………………….. 3 ÷ 15 V
  • Input DC Voltage ………………………………………………………………………..5 ÷ 15 V
  • Current …………………………………………………………………………………….. 150 mA
  • Mounting Holes (∅ 3.3 mm) ……………………………………………………. 44 × 74 mm
  • Dimensions ………………………………………………………………………………. 50 × 80 × 24 mm3
  • Working Temperature Range ………………………………………………….. –40 ÷ +60°C

LAYOUT OF MAIN CONNECTORS AND ELECTRONIC COMPONENTS

 

Input Connector J1, type IDC-10 (2.54mm):
1 – Input Trigger Pulse
2 G– ND
3 – DC Voltage
4 G– ND
5 – «Error» Message Signal
6 G– ND
7 – HV Amplitude Control 1:10000, or HV setting
VOUT = 1000 × (6 – V7)
8 G– ND
9 – Not/Connected
10 – GND

In order to set HV Amplitude remotely using Pin 7 of J1 Connector, it is necessary to move potentiometer R12 to the extreme right position, соresponding to the highest voltage. Input Resistance (Impedance) of Pin 7 is 4.8 kOhm.

Output Connector J2 type PW-03M (3.96mm):
1 – «negative» Q-switch electrode;
3 – «positive» Q-switch electrode.
Input Connector J3 type PW-03M (3.96mm):
1 G– ND
3 – «Plus» DC-bias Voltage applied to the Q-switch
HV Amplitude Control – R12.
TP1 – GND
TP2 – High-Voltage Adjustment 1:10000

LED Indicators:
D32 (Green) – «Pwr» – DC Voltage detected;
D41 (Yellow) – «Trig» – Input Trigger Signal;
D4 (Red) – «Err» – No High-Voltage Output;

ELECTRIC BLOCK-DIAGRAM

Schematic for the fast rising and falling fronts

Switching waveforms