In the board-level power supply noise test, it is very important to choose an accurate detection scheme. In "Power Supply Noise Measurement Challenges and Solutions", power ripple, power supply noise, and power distribution network have been introduced in detail. Distribution Network (referred to as PDN) related concepts and recommended power noise test solutions.
In this paper, three schemes are used to measure the power supply noise of the CPU on the motherboard. The best solution is a passive 50-ohm transmission line probe with 1× attenuation.
When using a passive 50 ohm transmission line probe, the oscilloscope's channel is set to DC50 ohms; since the power supply noise is measured at the board level, an oscilloscope with a bandwidth of 500 MHz or more can be used; the sampling rate is 2.5 GSa/s, and 1.25 G can be achieved. Quest bandwidth: The oscilloscope time base is set to 1ms/div, which can capture the signal of 10ms duration at a time, and completely measure the noise within 1 power frequency cycle (AC 50Hz after AC-DC-DC conversion, after rectification and voltage regulation) It is 100Hz with a period of 10ms). At this time, the oscilloscope has a memory depth of 25Mpts, as shown in Figure 1.
Photovoltaic inverter (PV inverter or solar inverter) can convert the variable DC voltage generated by photovoltaic (PV) solar panels into an inverter of mains frequency alternating current (AC), which can be fed back to the commercial transmission system, or for off-grid Grid usage of the grid. The photovoltaic inverter is one of the important balance of system (BOS) in photovoltaic array system, which can be used with general AC power supply equipment. Solar inverters have special functions for photovoltaic arrays, such as maximum power point tracking and island effect protection. Photovoltaic inverters usually consist of the following main parts:
DC input: The photovoltaic inverter receives DC power input from solar panels.
Inverter module: The inverter module is the core part of the inverter, responsible for converting direct current into alternating current. It contains multiple electronic components and switching circuits, through precise control and adjustment, convert direct current into alternating current of specific frequency and voltage.
Controller: The controller monitors and controls the operation and performance of the inverter to ensure the stable operation of the inverter and make optimal adjustments when needed.
Output: The output of the inverter is alternating current, which can be connected to household appliances, industrial equipment or incorporated into the grid to supply electricity.
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