CAPZero and SENZero
I happened to find these on www.powerint.com
The CAPZero is particularly interesting, of which the discharge resistors across the X-class capacitor(s) are open circuited when AC power is applied, and when AC power is removed, the CAPZero connects the discharge resistors, discharging the X-class capacitor(s) within one second.
It is easy to retrofit the CAPZero in any power supply design.
The SENZero addresses the issues of standby consumption of primary side control voltage rails.
As I said elsewhere, Power Integrations is my first choice in switching power supply controllers - as with most others, most of the hard work has been done for you, especially with design calculators, some of which are free.
The CAPZero is particularly interesting, of which the discharge resistors across the X-class capacitor(s) are open circuited when AC power is applied, and when AC power is removed, the CAPZero connects the discharge resistors, discharging the X-class capacitor(s) within one second.
It is easy to retrofit the CAPZero in any power supply design.
The SENZero addresses the issues of standby consumption of primary side control voltage rails.
As I said elsewhere, Power Integrations is my first choice in switching power supply controllers - as with most others, most of the hard work has been done for you, especially with design calculators, some of which are free.