In an article “Of power source pass on control loop what to effect there is? (one)In ” , did we introduce what to is meant by preferential mode? The article, the power source that we will explain to all sorts of preferential mode fall in detail is supplied implement characteristic.

 

Voltage is preferential mode

When preferential mode starts voltage, initiative voltage is set for 0V, electric current is set be worth for voltaic set. Because be,in voltage preferential mode falls, because this CV loop has priority, power source is started with constant voltage, voltage is the parameter after adjusting. Voltage begins from 0V, rise to CV gradually the voltage set value below loop adjustment, have fast voltage rise time and the smallest too strong performance.

 

If load is tall impedance, so RLOAD> (voltage is installed / electric current is installed) , power source maintains for CV, undertake clean adjustment to voltage, electric current will flow into load. Reach set voltage value as voltage, voltage crosses strong case to never perhaps appear rarely, because power source can undertake clean adjustment to voltage.

 

Function brings about CV to change medium electric current to rush too to CC

 

If be low impedance load, criterion RLOAD< (voltage is installed / electric current is installed) , voltage will begin to run with CV mode, low nevertheless laden impedance means voltage to cannot achieve a setting to be worth. Contrary, source electric current can arrive at electric current quickly to set a value, changeover is CC, voltage will break down. Arrive in CV mode in the brief changeover of CC mode, CC loop gains priority, need a few time to set voltaic adjustment the value for electric current. This meeting brings about brief electric current control is flabby, produce electric current to rush too further thereby (if pursue 1) .

 

Graph 1: Preferential mode character meets the voltage when starting the electric current in bringing about CV to be changed to CC is too strong

In short, in voltage preferential mode falls, volmeter reveals good character, what have thimbleful only is too strong. But arrive from CV mode in the alternate transition of CC mode, electric current rushs too likely, because right now voltaic adjustment did not gain priority.

 

Electric current is preferential mode

We read electric current now preferential mode. When with electric current preferential mode is started, electric current is set at first for 0A, voltage is set set a value for voltage. Because be,in electric current preferential mode falls, so CC loop has preferential sex, power source is started with CC mode, electric current is the parameter after adjusting. Electric current begins from 0A, adjust in CC loop next fall to rise to programming gradually the voltaic value of set, so that acquire good property, have fast electricity at the same time rise time and most peccadillo is strong.

 

If be low impedance load, criterion RLOAD> (voltage is installed / electric current is installed) , power source will maintain fall in CC mode, but tall laden impedance means power source to cannot make enough electricity sheds overload. Any electricity that carry tall laden impedance will produce tall tension on load, power source can achieve voltage quickly to set a value, change CV next.

 

Change momently to CV mode in CC mode period in, CV loop gains priority, its have an opportunity to set voltage adjustment the value for voltage. This meeting causes brief tension control is flabby, possible generation tension is too strong (if pursue 2) .

 

Graph 2: Preferential mode character can bring about the electric current when starting the tension when CC is changed to CV is too strong
 

In short, in electric current preferential mode falls, ammeter reveals good character, what have thimbleful only is too strong. But, from CC mode is changed to CV mode, voltage rushs too likely, because right now voltage adjustment did not gain priority.

 

Summary

Although preferential in the past mode is,through imitate the design comes true, but contemporary power source is supplied implement it is to use digital question mark to handle (DSP) , the height that the number passes on the technology such as loop and FPGA digitlizes control. The character of power source, include preferential pattern, can come true through digital technology, accordingly no matter be voltage preferential or electric current is preferential, area piece does not have the basic function of power source difference. Change character, no matter be in which kinds of mode under, power source won’t the circuit with different switch or transmit question mark through different method. Command power source adopts digital control system to run means differently to realize voltage preferential or electric current is preferential.

 

Accordingly, if your apprehension crosses strong issue, can choose proper preferential mode: Rush too in voltage must below the least state of affairs, slant for example buy arrives when low voltage processor or FPGA core, should use tension preferential mode; If need to reduce electric current to rush too as far as possible, or your wait for measure package to be low impedance, charging to batteries for example or when drive includes the system of large electric capacity, should use electricity preferential mode.