Re: Cyberpower PR1500 won't charge battery
The VIPER has internal charge pump circuit that charge up the 22uF startup/running cap, when the the VDD reach the startup Voltage point to get the VIPER running then the charge pump stops then the VDD get the running Voltage from the AUX winding.
That protection Zener D23 is not needed for the VIPER to run, it is for protection in case the VDD goes up to high, typical Voltage for that Zener is around 22V.
The diode and the 50K resistor and the the cap are for the RCD snubber circuit (R1/D1/C2 in the example circuit as shown in the spec sheet).
From VIPER22 spc sheet page 6/20
Power supply of the control circuits. Also provides a charging current during start up
thanks to a high voltage current source connected to the drain. For this purpose, an
hysteresis comparator monitors the VDD voltage and provides two thresholds:
- VDDon: Voltage value (typically 14.5V) at which the device starts switching and turns
off the start up current source.
- VDDoff: Voltage value (typically 8V) at which the device stops switching and turns on
the start up current source.
The VIPER has internal charge pump circuit that charge up the 22uF startup/running cap, when the the VDD reach the startup Voltage point to get the VIPER running then the charge pump stops then the VDD get the running Voltage from the AUX winding.
That protection Zener D23 is not needed for the VIPER to run, it is for protection in case the VDD goes up to high, typical Voltage for that Zener is around 22V.
The diode and the 50K resistor and the the cap are for the RCD snubber circuit (R1/D1/C2 in the example circuit as shown in the spec sheet).
From VIPER22 spc sheet page 6/20
Power supply of the control circuits. Also provides a charging current during start up
thanks to a high voltage current source connected to the drain. For this purpose, an
hysteresis comparator monitors the VDD voltage and provides two thresholds:
- VDDon: Voltage value (typically 14.5V) at which the device starts switching and turns
off the start up current source.
- VDDoff: Voltage value (typically 8V) at which the device stops switching and turns on
the start up current source.
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