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Input Specificationとは
Input Specification
This time, we will explain the "input specification" as part of a glossary for AC adapters.
Below is an example of the input specifications taken from Unifive’s AC/DC Power Adapters — Desktop & Wall-Mount specification sheet.
We will explain the following five items: "AC input voltage", "AC input voltage range", "AC input frequency", "AC input current", and "AC inrush current".
Example of Input Specification from Unifive Product Sheet
| Item | Specification | Min | Typical | Max |
|---|---|---|---|---|
| AC Input Voltage | Single-phase AC | 100V~200V | ||
| AC Input Voltage Range | Single-phase AC | 90V | 264V | |
| AC Input Frequency | Single-phase AC | 47Hz | 50/60Hz | 63Hz |
| AC Input Current | Input voltage (typ) and full load output | 0.365A | 0.44A | |
| AC Inrush Current | Input voltage (typ) and full load output | 40A | ||
| CEC Efficiency | Complies with CEC Level V requirements | 82.22% | ||
| Standby Power Consumption | Complies with CEC Level V requirements | 0.3W | ||
| Leakage Current | Maximum input voltage | 0.25mA |
The image below shows an example of how to use AC/DC Power Adapters — Desktop & Wall-Mount. The AC plug is inserted into a household outlet, and the DC plug is connected to electrical devices such as a computer for use.
"Input Specification" defines the usage conditions for the AC plug side.
Input Voltage and Frequency
AC INPUT VOLTAGE and AC INPUT FREQUENCY define the voltage and frequency that can be input to the AC adapter.
The AC VOLTAGE RANGE defines the upper and lower limits of the AC input voltage.
If the value falls below the lower limit, proper output voltage cannot be obtained. If a voltage exceeding the upper limit is applied, the AC adapter may not only malfunction but also become damaged, so please use with caution.
| Item | Specification | Min | Typical | Max |
|---|---|---|---|---|
| AC Input Voltage | Single-phase AC | 100V~200V | ||
| AC Input Voltage Range | Single-phase AC | 90V | 264V | |
| AC Input Frequency | Single-phase AC | 47Hz | 50/60Hz | 63Hz |
Input Current and Inrush Current
AC INPUT CURRENT is the current flowing on the input side when using AC/DC Power Adapters — Desktop & Wall-Mount at rated output current, defined as the TYPICAL value.
Since input current varies slightly with each adapter, the MAX value is defined so that individual variations do not exceed it.
When using multiple AC/DC Power Adapters — Desktop & Wall-Mount with power strips or similar wiring devices, care must be taken to ensure that the total of the TYPICAL values does not exceed the capacity of the wiring device.
| Item | Specification | Min | Typical | Max |
|---|---|---|---|---|
| AC Input Current | Input voltage (typ) and full load output | 0.365A | 0.44A | |
| AC Inrush Current | Input voltage (typ) and full load output | 40A |
AC INRUSH CURRENT is the instantaneous current that flows when an AC/DC Power Adapter — Desktop & Wall-Mount that has not been powered for a while is connected to an outlet, and is defined by this peak measurement.
The waveform actually observed with an oscilloscope is shown below.
A large current flows, but since it only flows once instantaneously when connected to power, there's usually no need to worry about wiring devices. However, noise may be emitted into the air, so please be cautious when using electrical devices that are susceptible to noise nearby.
Glossary of AC Adapter Terms Part 2: Input Specification — This concludes the first half.
If you have any questions regarding other terms and specifications or want to know which AC/DC Power Adapter — Desktop & Wall-Mount model to use for a particular application, feel free to contact us via the inquiry form on our website.