When people design electrical circuit moΩ✔≥•dules or finalize new produ™₽cts, they rarely seriouslβ©•₩y consider the choiceλ&☆ of supporting power supply, and do not re-evalu™ §ate this problem until they find   ∏★that the problem lies in the po®₽€™wer supply part. To he±δlp people, this article descr↔±ibes the definition of the Ω$parameters of a DC power suβ₩pply and the potential imp•γ↓₩act of the unit under test (UUT) or other♣★φ circuit system. First, the σ♦basic basis for choosing a power supply vo☆≤ltage and current range, these are the two•→≈ easiest indicators to determine,★‌✔✘ as long as it is calculated according to the pow ♦↕er consumption of the circuit. ←≠However, if only a single DC voltage is ♠λused to power the UUT, it should₹™ be considered to test the high ©​and low supply voltage extrem♥φ<®es of the UUT. Most stationary power supφ≈plies allow the output voltage t'☆≠o vary ± 10%, b™←ut if this is not sufficient for th×σ₽e circuit, a power supply with adjusta •'ble output or a larger range of variatio™ε↑ns is optional. If this power supply is ¶↓ used to supply a combined u€↑ nit, 75 to 90 percent of the maximum current rβ≈equired by the device is provided by a singleσ‍ power supply, and two or more powerπ✔✘ supplies can be connected to the in↓☆sufficient part. The power supply s•&upplying the semi-stationary ±​φ✘test bench must have a c¥♥™apacity of at least 125% of the current requ≤$↔ired for the test bench. 1. Working modeλφ  Almost all DC power supplies work iφλn constant voltage source mode, which mean♠&¥s that the output vol× tage can remain unchanged in the enti‍ ♦re current change range. There π ←↔are also a number of >★power supplies that can also work in value source¶₽ mode within a certain range. γ↑←≠The range of power out ≠put is not limited by the voltage or current outp♦£₽♠ut capability of the power supply itself, but×¥₩ also related to the wor¥→¶king state of the power supply. A few pow←><er supplies also serve β®₩Ωas electronic device loads, in which case theε★¶≠y can be used to test other c↔↕onstant voltage or constant current sourc®"∏λes. 2. Response time When the power supply c•₹an be remotely controlled or th±δe power supply is part of the test sys¶×✔tem, then the delay t &ime from the issuance β↔of the control command to the st↕©abilization of the powe≠<→≠r output to the desired value is a very important$"α factor (e.g., turning on or changing the voltag÷σe). Response times range fr$≤om a few milliseconds to tens¥→₩× of milliseconds. A small amount of power sup>Ωply can have a fast conλ≠‌version rate of more than IV♣γ/us. These power supplies can be used to create h¶&igh-power arbitrary waveform generat∏$♦→ors. 3. Resolution: The m↔®βinimum adjustable increment of λ¥output voltage or currλ÷♠ent limited by technical parameters. ↓★Some power supplies have the same δ‍‍ resolution across the entire§Ωλ output range, while some have differe§φ₽Ωnt resolutions over different o‍"™utput ranges. 2. Accurβ✔•acy, Expansion and Securit ±¥¥y of Power Supply 1. Remote Sensing Char​₽± acteristics In order to accurat£ £♦ely control the voltage or current value ₽♠on the load, any chan δges in the circuit can be fed b€↓α<ack to the regulator circuit thr™↔ough an independent sensing channel, so that an±‍¶y change in voltage drop bet♦₽¶ween the UUT and the α★βpower supply can be corrected. 2