Example of the digital control modification for the power supply
Failure identification by multiple alarms from digital signal outputs.

Is it possible to identify which abnormal condition occurred from multiple signal outputs?
Yes. By the modification, alarm waveforms help identify which abnormal condition occurred.

Alarm identification function

A power supply with an alarm function detects an abnormality in the output voltage, and then it generates a built-in alarm signal to notify the problem.
This alarm function is useful to identity that the power supply has stopped. However, it's not possible to identify the cause of the stoppage, so it's difficult to take corrective action in the field.
If an external component other than the power supply was the reason of failure, the power supply will stop again even if the power supply is replaced.

The concept of the alarm function is to identify the cause of the abnormality by generating different alarm waveforms which change depending on the cause of the problem.

By a LED lighting pattern, it's possible to visualize the cause of the failure. The LED lighting frequency differs based on the alarm generating condition. It's possible to easily find out the cause of the output stoppage from this LED visual.

The alarm output continues even when the power supply is restored from an abnormal condition, allowing the user to confirm the occurrence of an abnormality without missing it.

Fig.1  Example of alarm pulse signal

Other methods for identifying the alarm are below:
         ・ Check by connecting an external resistor or capacitor and measuring the voltage.
         ・Check by counting the pulse voltage for a certain period of time .       etc.

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Application example

  • Industrial machinery
  • Ticket-vending machine
  • LED sign etc.

Other examles

  • Reduce a high abnormal current.
  • Reduce standby power.
  • Examples of power supplies that can be modified

    With modifications, various functions can be added.

    Technical Product-related Inquires