Switch power source has how many index, do you know? The index that the index that inputs voltage to affect output voltage, load affects to outputting voltage, index of ripple voltage waits relevant index a moment, read the article to announce little ~~ for you

 

One, the form of a few index of voltage of output of influence of descriptive input voltage

 

1, absolutely voltage-regulation coefficient

 

A. Absolutely voltage-regulation coefficient: When stating load is changeless, of U0 of △ of quantity of change of dc of output of regulated power supply and Ui of △ of quantity of change of input electrified wire netting than, namely: K=U0/Ui.

 

B. Relative to voltage-regulation coefficient: When stating load is changeless, the Uo of △ of opposite change quantity of Uo of manostat output volts d.c. and the opposite change that output Ui of electrified wire netting measure △ Ui than, namely: Ui/Ui of △ of S= △ Uo/Uo /

 

2, regulation of electrified wire netting

 

It expresses to input voltage of electrified wire netting to change by rating when ±10% , regulated power supply exports the opposite change quantity of voltage, also express with absolute value sometimes.

 

3, voltage stability

 

Load current maintains for any values inside rated limits, the output tension that input voltage causes in place of the change inside formulary limits changes relatively △ Uo/Uo (100 minutes of values) , call the voltage stability of manostat.

 

2, the form of a few kinds of index that load affects to outputting voltage

 

1, laden regulation (also call electric current regulation)

 

Below voltage of rated electrified wire netting, load current arrives from 0 change the biggest when, export the quantity of the biggest opposite change of voltage, commonly used percentage expresses, also express with absolutely change quantity sometimes.

 

2, output resistor (also call equivalent internal resistance or internal resistance)

 

Below voltage of rated electrified wire netting, as a result of load current metabolic △ IL causes Uo of △ of output voltage change, output resistor to be Ro= | IL of △ Uo/ △ | .

 

3, the form of a few index of ripple voltage

 

1, voltage of the biggest ripple

 

In rated output voltage and load current fall, output voltage ripple (include noise) absolute value, express with peak peak value or virtual value normally.

 

2, ripple coefficient Y (% )

 

Below rated load electric current, of the virtual value Umrs that outputs ripple voltage and Uo of output volts d.c. than, namely: Y=Umrs/Uox100%

 

3, ripple voltage is restrained than

 

The ripple frequency in the regulation (for example 50HZ) below, of the ripple voltage Ui~ in inputting voltage and the ripple voltage Uo~ in outputting voltage than, namely: Ripple voltage is restrained than =Ui~/Uo~ .

 

Here states: Noise is different from ripple. Ripple is a kind of when appear between output terminal as synchronous as input frequency and switch frequency composition, with the peak – peak (Peak To Peak) the value expresses, be in commonly output voltage 0.5% the following; Noise is a kind of beyond the ripple that appears between output terminal high frequency composition, also use a peak – peak (Peak To Peak) the value expresses, be in commonly output voltage 1% the left and right sides. Ripple noise is the synthesis of both, with the peak – peak (Peak To Peak) the value expresses, be in commonly output voltage 2% the following.

 

4, impulse current

 

Impulse current is when showing input voltage presses a regulation to time-interval puts through or disconnect, the electricity of the biggest moment that before input electric current reachs steady state, carries, it is 20A ～ 30A commonly.

 

5, shed protection too

 

Shedding protection too is function of protection of load of a kind of power source, can avoid to produce the short circuit that includes to output terminal to go up inside overload output electric current is right power source and laden attaint. The 110% ～ that the set-point that flows too is rated electric current commonly 130% .

 

6, press protection too

 

Pressing protection too is the function that a kind of big to passing between terminal voltage has load is protected. The 130% ～ that general provision is output voltage 150% .

 

7, output is owed press protection

 

When output voltage is when mark fiducial value is the following, detect output voltage drops or close power source to erupt simultaneously to protect load to reach an alarm signal, the 80% ～ that are output voltage more 30% the left and right sides.

 

8, overheat protection

 

Happen in power source interior unusual or because use undeserved and power source closes to erupt simultaneously when making power source temperature rise exceeds bid an alarm signal.

 

9, temperature drift and temperature coefficient

 

Temperature drift: The change of environmental temperature affects the change of parameter of yuan of parts of an apparatus, cause manostat to output voltage change thereby. Commonly used temperature coefficient represents the bulk of temperature drift.

 

Absolutely temperature coefficient: Temperature changes the metabolic △ Uo that 1 ℃ causes output voltage to be worth, the unit is V/ ℃ or millivolt every Celsius.

 

Relative to temperature coefficient: Temperature changes 1 ℃ causes output tension UoT/Uo of opposite change △ , the unit is V/ ℃ .

 

10, drift

 

Manostat maintains particular case to fall in input voltage, load current and environmental temperature, the stability of component parameter also can cause the change that outputs voltage, slow change calls drift, sharp change makes noise, interpose at both between make rise and fall.

 

The means that represents drift has two kinds:

 

1. The metabolic △ Uot that pointing to to voltage is outputted to be worth inside time surely.

 

2. The Uot/Uo of opposite change △ that pointing to to voltage is outputted inside time surely.

 

The time that inspects drift can be 1 minute surely, 10 minutes, 1 hour, 8 hour or longer. It is only in the manostat with taller precision, just have temperature coefficient and Wen Piao two index.