Power supply offers high peak load for medical laser applications
For high peak load applications in the medical sector, Powerbox has developed the SMM3000A80024C series. Based on digital control and high energy storage management techniques, the SMM3000A80024C series delivers 2.25kW repetitive peak power to medical lasers with high efficiency, says the company. It complies with medical safety standards and, for silent operation, it includes a thermo-controlled cooling system.
Laser equipment requires very high peak energy levels to be delivered to the laser or discharge tubes. However, repeated high peak energy generates electromagnetic radiation and line disturbance which can generate line disturbances, potentially jepoardising patient and operator safety when high voltages and energy levels are involved.
CO2 lasers, or Erbium YAG, are commonly used in medical applications, though the energy released during the pulse related to the specific task can vary widely. There are different types of pulsing for CO2 lasers. For cosmetic surgery, the newer UltraPulse technology is a very short pulse duration with high pulse power and very high influence. This is faster than SuperPulse technology which use medium pulse duration with medium pulse power.
“A good device has less than a millisecond pulse width, meaning that it is incredibly fast-firing, requiring the power supply to be able to deliver high energy levels during the pulse, but also able to restore energy for the next pulse,” explained Patrick Le Fèvre, Powerbox chief marketing and communication officer. To meet this challenge, Powerbox combined digital power and the company’s PRBX 2.25kW AC/DC capacitor charger in the SMM3000A80024C for effective operation and compliance with the medical safety standard IEC60601-1 3rd.
The power supply provides a level of protection, primary to secondary main output of 2xMOOP (means of operator protection), and 2xMOPP (means of patient protection) to auxiliary output. To accommodate different capacitor banks and applications, the output voltage can be adjusted from zero to 800V DC (600V DC nominal) with an output current of 5.5A at nominal. An automatic current controller guarantees that the power envelope is always within safe limits, reducing capacitor ageing and overstressing of components.
The SMM3000A80024C has a built-in microprocessor constantly monitoring the charging status, reporting end of charge and discharge level, as well as all protection warnings due to abnormal operation such as over-temperature, over-voltage and current.
To reduce line disturbances the SMM3000A80024C includes a very high efficiency power factor corrector (PFC), soft-start circuitry, filtering and is housed in a six-sided shielded case. To limit audible noise to a minimum, the SMM3000A80024C’s fans are thermo-controlled, regulating their speed to the minimum required for normal, safe operation.
The SMM3000A80024C also delivers an auxiliary output voltage of 24V DC, reducing the need for an additional power supply to power laser controller and interfaces. For additional power, the SMM3000A80024C can be connected in parallel.
(Picture source: PRBX / mydegage / Shutterstock)