A Look Inside

Before reading this page we strongly suggest to take a look at this article, which will help you understand the internal components of a PSU much better.


The OEM of this unit is Super Flower and the twin brother of LZP-1000 is the Super Flower Golden King 1000W. The only difference between these two units is the decals they have, with everything else being identical. So this platform utilizes an LLC resonant converter, to achieve higher efficiency through Zero Voltage Switching of the two primary fets and in the secondary side a synchronous design is used along with two DC-DC converters for the generation of the minor rails.


The transient filtering stage starts at a small PCB behind the AC receptacle with a CM choke, one X and two Y caps. It continues on the main PCB with one more CM choke, two X and two Y caps with the latter installed after the bridge rectifiers. Unfortunately there is no MOV installed, the component that protects the PSU/system from spikes coming from the power grid and this is a great shame!


The two parallel bridge rectifiers are bolted on the primary heatsink and their model number is (US30KB80R). Each one can handle up to 30A so they are quite strong even for the 1KW of the unit's max power.


In the APFC two IPW50R140CP chop the incoming fully rectified signal and along with a boost diode and a pretty large choke the same signal is boosted up to a loosely regulated ~380V DC bus voltage. The capacitors that smooth this DC bus voltage are two parallel Nippon Chemi-Con with unequal capacitance (560μF the big one, 470 μF the smaller one, 400V, 105C, KMQ series). Finally, the PFC controller is an NCP1653A which is located on a vertical PCB next to the large PFC choke.


Between the PFC choke and the larger of the two hold up caps resides the thermistor, responsible for protection against large inrush currents and the electromagnetic relay that isolates it from the circuit, once the start up phase finishes.


An LLC resonant converter is used to allow the primary switches perform almost loss-less switching and one more advantage of this converter is also the reduced EMI signature thanks to the sinusoidal primary current waveform. As primary choppers two IPW50R140CP are used.


The standby PWM controller is located on the component side of the main PCB and its model number is ICE3B0565.


In the secondary side synchronous design is used so the +12V rail rectify ten IPP041N04N fets. We are talking about serious overspec here since each one of this fets can provide up to 80A in continuous mode! Eight polymer caps along with some electrolytic ones (105°C, KZH, KZE and KY series) filter this rail. All are Japan made and provided by Nippon Chemi-Con.


The two DC-DC converters, responsible for the generation of the minor rails, are shielded for protection against EMI. On each converter we spotted two pairs of fets, which however we couldn't identify without some serious desoldering.


On a quite large vertical PCB, in the secondary side, the propriety SF2901 IC is located that plays the role of the LLC resonant controller and at the same time does the housekeeping job, meaning that it handles all the protections of the PSU. Apparently this IC was specifically made for Super Flower so we couldn't find any info about it on the net. On the solder side of the same PCB there is an LM324ADG Quad Operational Amplifier.


On the front of the modular PCB there are eight Nippon caps (KY series) for extra ripple filtering. On the solder side we find many hand made solder touch ups.


Soldering quality on the main PCB, at least on most of its part, is quite good although it isn't up to the levels of Delta or Seasonic high-end units. Underneath the main transformer there are some enhanced solder joints that don't look so nice but apparently this doesn't prevent them from doing their job. Also this PCB supports up to five +12V rails, but Super Flower decided to form a single one instead.


The cooling fan has Kingwin's logo in its center without any other details about its model number and its characteristics. However since it is identical and most likely the same as the fan that the Super Flower Golden King 1000W uses then its model number must be HA1425M12B-Z (12V, 0.36A). Even at high speed the fan is very quiet and at the same time highly efficient. It is also equipped with a plastic baffle to direct the air towards the rear side of the unit.