what's going wrong if power supply voltage can not be adjusted up?

When using DC regulated power supply, you will encounter the situation that the current can not be adjusted up or the voltage can not be adjusted up, why is this? Today power adapter manufacturers will introduce you to it.

　　Phenomenon 1: output voltage but no current, or current but no voltage

Whether it is one of the above cases, the power supply has been working normally, the operator should check their load is good contact, whether the load is short-circuited or open-circuit, whether the load is in line with the specifications and so on. From the extreme case, if the power supply voltage output (constant voltage state), and the load line is broken, the natural output current is equal to zero. Similarly, if the power supply has current output (constant current state), and the load is short-circuited, the natural output voltage is equal to zero.

　　Phenomenon 2: In the mediation of voltage, found that the no-load voltage can not be adjusted.

Some operators like to "current regulation" potentiometer left to the head, so that the power supply no-load voltage can not be adjusted up. This shows that he is "current regulation" lack of substantive understanding. Because even if the power supply is in the no-load also want to consume a little bit of current, and you put the "current regulation" off to zero, even a little bit of current are not put out, of course, the no-load voltage can not rise. So "current regulation" generally do not adjust to zero (to the right to adjust to a quarter turn or so will not happen above).

　　　Phenomenon 3: power supply voltage output and current output, but then adjust the voltage, the voltage can not be adjusted up. Or power supply voltage output and current output, and then want to adjust the current a little more, the current is not adjusted.

　　This is due to the operator of the "constant voltage", "constant current" concept is not very clear reasons. If the "constant voltage" light is on, indicating that the power supply is working in a constant voltage state (can be considered the voltage accounted for the active position), the output current size, is determined by the load, rather than by the operator out of the (can be said that the current is accounted for the passive position), if this time to go to the right to rotate the "Current Adjustment "knob, the current will not increase. But then go right "voltage adjustment" knob, the output voltage will rise, the output current will also rise. The above is the power adapter manufacturers summarize the experience, I hope to help you.

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