Cynosure Cynergy, Техническое руководство

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26 of 112 850-1265-000, Rev. 4 Cynosure, Inc.
High Voltage Power Supply Module
The High Voltage Power Supply (HVPS) is a modular inverter capacitor-charging power supply.
This device accomplishes the primary energy conversion for the laser. It converts input power of
220 VAC, 50 or 60 Hz, to a controlled, high-voltage direct current. One of two charge rates,
1000J/sec or 4000J/sec, may be set externally by a toggle switch. A software controlled low-
voltage analog signal is used to set the appropriate HVPS output voltage level during laser
operation. When enabled, the power supply charges the capacitor bank through the capacitor
bank fuses. The laser control board also inhibits, enables and regulates high voltage output level
depending on the state of the laser.
For demonstration purposes, the system can operate at reduced power with 120VAC, 15Arms
input power. In the “low charge rate” or 120V mode, the power supply will charge the 24,000µF
capacitor bank in 5.3 seconds (from 750 to 1000VDC). This setting substantially reduces the
laser pulse repetition frequency and is intended for demo purposes only. In the “high charge rate”
or normal operating mode, the power supply will charge the 24,000µF in 1.3 seconds (750 to
1000VDC). To select the power supply charge rate, see section on setting the voltage” in the
Cynergy Quick Install Guide .
The power supply control voltage set’s the capacitor bank voltage and is a 0 to 8Vdc analog
signal which corresponds to “150V
OUT
/V.” This control voltage goes into the module through
pin 5 on the control interface cable. The enable/reset signal or the on/off control for the power
supply is controlled by grounding pin 1 on the control interface cable. Applying a <1 volt signal
to pin 1, the power supply receives an inhibit signal to turn it off and resets the fault latch.
Ap 15VDC to pin 1, enables that power supply to turn it on. A read back signal is
generated in the power supply and is transmitted to the front control module through pin 7 on the
control interface cable. This read back is an analog output of 0 to 8 volts and is “1V/150V.” The
end of charge indication is transmitted through pin 13. This signal goes low when the power
supply has reached the programmed output voltage (pin 5).
If the power supply charges for more than 20 seconds and does not reach the program voltage,
pin 2 goes high indicating an overload condition. This will provide a power supply fault and the
laser will go into a fault condition. Power supply fault conditions are sent out on pins 2 and 6.
Capacitor Bank Module
WARNING: High Voltage Danger! The capacitor bank stores dangerous voltage and
energy levels during laser operation. Please handle with extreme caution.
The capacitor bank module, see Figure 5 , consists of twelve 18,000 µF, 400-volt capacitors
coupled in a series/parallel configuration to provide a 1200-volt, 17.3-kilojoule stored energy
source. This large amount of stored energy must be regarded carefully.
Only a fraction of this stored energy is drained off for a given laser pulse. In a fault condition,
the stored energy is discharged through an electronic dump circuit within the module.