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Q-switch Driver
- Compact Design
- Easy to operate
- Wide range of selection
- Double Protection System
PRODUCT DESCRIPTION
1. QSD Series RF Driver
A high power RF driver module is available in output powers of 50W, 75W or 100W. Powered from 220VAC or 110VAC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is automatically implemented.
Main Specifications:
-
RF power output : 50W, 75W or 100W
-
Frequency: 27.125MHz
-
VSWR: ≤1.2
-
Modulation repetition rate: 800Hz-50kHz
-
First pulse suppression
-
Modulation control inputs: digital TTL , till 100kHz
-
Driver over-heat, Q-Switch over-heat
-
Internal over-temperature protection and over-current protection
-
Digital display of frequency
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Supply voltage input: 220VAC/110VAC, <150W
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Dimension: 483x88x308mm
-
Weight: 8kg
RF power output : 50W, 75W or 100W
Frequency: 27.125MHz
VSWR: ≤1.2
Modulation repetition rate: 800Hz-50kHz
First pulse suppression
Modulation control inputs: digital TTL , till 100kHz
Driver over-heat, Q-Switch over-heat
Internal over-temperature protection and over-current protection
Digital display of frequency
Supply voltage input: 220VAC/110VAC, <150W
Dimension: 483x88x308mm
Weight: 8kg
Model Numbers: QSDxxyyA
QSD – QSD series RF driver
XX – RF frequency, 27-27MHz, 24-24MHz
YY – RF output power (W), 50-50W, 75-75W
A – Classification G, Z, T
Example QSD-2750 (50W), QSD-2775 (75W) or QSD-27100 (100W)
Main Features of QSDxxyyT Series Digital Q-switch Driver:
Newly designed digital RF driver has the following features comparing with analog version:
- Touch panel
- Digital circuit to improve control accuracy with frequency resolution of 0.01Hz (0.001Hz or less upon request)
- Internal trigger synchronizing with laser, to achieve perfect marking
- Integrated open load protection
- Easier and more accurate panel controlled laser delay.
2. R390 Series RF Driver (high power)
R390xx-yyDMzzz
A compact high power RF driver module is available in output powers of 50 or 100W. Powered from 28VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is implemented through either analogue modulation, RF off analogue control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our FPS guidance notes. On board LED’s and TTL logic outputs monitor driver status and cooling is through forced air over the heat sink.
RF Power Output (yy) |
50 or 100W |
Frequency (xx=24, 27, 41) |
24.00MHz, 27.12MHz or 40.68MHz (50W) |
First Pulse Suppression |
Triggered First Pulse Suppression: FPS |
(zzz=FPS, PPK, R05, A05, A13) |
Triggered Pre-Pulse Kill: PPK |
|
RF Off Analogue Control: 0-5V R05 |
|
Analogue Modulation: 0-5V A05 / 2-13V A13 |
Frequency Tolerance |
± 0.02% |
Output Impedance |
50W |
RF Fall-Time |
< 100ns (60ns typical) |
RF Rise-Time |
250ns typical |
Extinction Ratio |
> 52dB |
Harmonic Levels |
< -30dB at full power |
Supply Voltage Input |
28VDC ±5% |
Supply Current Input |
6.5A (50W), 9.0A (100W) |
Modulation Control Inputs |
Digital TTL (TTL high = RF off) |
Modulation Repetition Rate |
100Hz to 100kHz |
Internal Pulse Width |
1µs to 14µs, typical |
Status Monitoring |
Power supply on, High VSWR |
|
RF power low, RF power maximum |
|
Driver over-heat, Q-Switch over-heat |
Housing |
Module |
Storage Temperature |
-20ºC to +85ºC |
Operating Temperature |
+10ºC to +55ºC |
Dimension |
220 x 160 x 105mm |
Weight |
1.5KG |
3. R390 Series Q-switch Drivers (low power, high speed, compact Q-switch Driver, 2-24W)
R390xx-yyDMzzz-SC
The R390XX-YYDMZZZ-SC is a low to medium power radio frequency generator in a compact, OEM package. The driver supplies an RF signal to an acousto-optic Q-Switch, typically in an Nd:YAG laser. The Q-Switch, when excited, deflects a large portion of the laser light off the optical axis of the laser cavity spoiling the gain in the cavity and allowing the energy to be stored in the upper state of the gain media. When the RF is turned off, typically in 50ns, the Q-Switch becomes transparent and a light pulse is output from the laser.
The RF driver has two digital modulation inputs: Fixed and Variable. These controls allow the customer to issue a pulse command of a "Fixed" pulse width, the duration determined by the driver pulse width control, settable by the customer, or issue a "Variable" pulse command, the duration determined by the input signal pulse width. The RF driver may be modulated in "Fixed" duration mode at any frequency from 1 Hz to 500 kHz by an external frequency source. In "Variable" duration mode, the RF driver can be modulated from DC to 500 kHz. The RF energy can be modulated off in a short period of time (50 ns typical). The RF Driver can produce up to 24 watts output into a 50 ohm load. The R390XX-YYDSZZZ-SC driver is factory configured for RF Frequency, Power, and Control Options when ordered. The R in the model number indicates that this product is compliant with the EU Directive 2002/95/EC for Reduction of Hazardous Substance.
Output RF frequency options: XX = 24, 27, 41
RF frequency = 24.00 MHz, 27.12 MHz, or 40.68 MHz
RF power: YY = 2 - - - 24
2 to 24 watts
Factory set to match the matching Q-Switch
Adjustable but limited to no more than 10 % above rating.
The 390XX-YYDMZZZ-SC driver is factory set when ordered with a control option, which determine the type of control of the output power. The options available that control the RF output level for the 39000 drivers include:
Control Option: ZZZ
FPS = First Pulse Suppression
PPK = Pre Pulse Kill
R05 = RF off Analog Control
A05 = Analog Control
The option available for the driver is factory set, and is specified by the last three letters of the model number. When the FPS or PPK control option is selected, the circuit is designed to eliminate the large light pulse that is output from the laser after a long period of inactivity. Normally, the first pulse from a Q-Switched laser that has been held off for over 100 ms will be much larger than the subsequent pulse. This excess energy can cause unwanted damage to the target of the laser. The circuit does this by scaling the energy sent to the Q-Switch. The result is that this first pulse has the lower energy compared to the subsequent pulses. When the A05 or R05 control option is selected, the circuit is designed to control the output with an analog input signal allowing intensity control of any pulse. This control is used to vary the output energy of the laser pulse.
A compact high power RF driver module is available in output powers of 50 or 100W. Powered from 28VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is implemented through either analogue modulation, RF off analogue control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our FPS guidance notes. On board LED’s and TTL logic outputs monitor driver status and cooling is through forced air over the heat sink.
Parameter |
Specification |
Output Frequency: |
XX = 24, 27, or 41, Where RF Frequency = 24.00, 27.12, 40.68 MHz ± 0.01% |
Spurious Levels: |
-50 dBc Maximum |
Harmonic Distortion |
-20 dB Maximum |
Modulation Input |
|
Mod In Fixed (pin 3 ) |
TTL Levels Triggered on TTL Rising Edge. Pulse Width Applied >50 ns. |
Mod In Variable (pin 5) |
TTL Levels TTL HIGH = RF Off |
Extinction Ratio: |
40 dB Minimum |
RF Rise Time 10% to 90% |
100 ns Maximum |
RF Fall Time: 90% to 10% |
50 ns Maximum |
Modulation Repetition Rates: |
1 Hz to 500 kHz for Fixed Modulation DC to 500 kHz for Variable Modulation |
Fixed Modulation Output Pulse Width Adjustment Range: |
1 to 20 μs, Customer Adjustable |
Available Pulse Suppression Modes: |
ZZZ = Mode |
Modulation Operating Mode is "Factory Set" Internally. |
FPS = First Pulse Suppression PPK = Pre Pulse Kill R05 = RF Switched to Analog Control A05 = Analog Control |
FPS Trigger (pin 2) for Pulse Suppression for Units Configured with FPS, PPK: |
TTL Levels, Triggered on TTL Rising Edge |
Analog in (pin 6) for Power Control for Units Configured with A05, R05 |
0 to 5 volts Analog |
Enable - Stand by Mode (pin 11) |
< 3 watt dissipation in stand by mode. TTL High or no connection = Normal operation TTL Low = Stand by Mode Momentary TTL Low = Driver Reset - after fault is removed. |
Zero Crossing Enable (pin 7) normally: |
TTL high or no connection- disabled, TTL low- enabled |
If model # is (-ZC): |
TTL high or no connection- enabled, TTL low- disabled |
Sync out (pin 1 ) |
Outputs 3.3 volt signal |
RF Power Output: |
YY watts where YY = 2 to 24 watts |
Output Impedance: |
50 Ω |
Supply Voltage: |
+15 VDC |
Supply Current: |
< 3 amps. |
OPERATING TEMPERATURE: |
+10 to +55 0C Case Temperature |
Contact Cooled |
The Driver must be attached to a heatsink capable of dissipating 25 watts |
MAXIMUM RATINGS: |
|
Supply Voltage: |
+18 volts |
Power Output: |
No DC Feedback Allowed |
Storage Temperature: |
-20 to + 850C |
Dimension | 90x60x25mm |
4. R390 Series Q-switch Drivers (low power, compact Q-switch Driver, 2-24W)
R390xx-yyDMzzz
Powered from 24VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is implemented through either analogue modulation, RF off analogue
control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our FPS guidance notes.
TTL logic outputs monitor driver status and cooling is through forced air over the heat sink.
RF Power Output (yy) |
2 to 24W |
Frequency (xx=24, 27, 41, 80) |
24.00MHz, 27.12MHz, 40.68MHz or 80MHz |
First Pulse Suppression (zzz=FPS, PPK, R05, A05, A13) |
FPS: Triggered First Pulse Suppression PPK: Triggered Pre-Pulse Kill R05: RF Off Analogue Control: 0-5V A05: Analogue Modulation: 0-5V |
Frequency Tolerance |
± 0.02% |
Output Impedance |
50Ω |
RF Fall-Time |
< 50ns |
RF Rise-Time |
500ns max |
Extinction Ratio |
> 30dB |
Harmonic Levels |
< -30dB at full power |
Supply Voltage Input |
24VDC ±5% |
Supply Current Input |
< 2.5A |
Modulation Control Inputs |
Digital TTL (TTL high = RF off) |
Modulation Repetition Rate |
100Hz to 100kHz |
Internal Pulse Width |
1μs to 20μs |
Status Monitoring |
High VSWR, RF power low, RF power maximum |
Housing |
Module |
Storage Temperature |
-20ºC to +85ºC |
Operating Temperature |
+10ºC to +55ºC |
Air Flow through Heat-Sink |
>17 litres / second @ 25ºC |
Dimension |
148x100x55mm |