Explanation of the parameters and terms of the power module

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Explanation of the parameters and terms of the power module [Copy link]

In the power module technical manual provided by the manufacturer, there are generally a lot of parameter data. The main parameter terms are explained below.

Rated input voltage:

refers to the nominal value of the voltage between the specified input terminals of the power supply under specified working conditions.

Rated input current:

refers to the current under rated input voltage conditions.

Rated output power:

refers to the maximum power that can be output for a long time under specified working conditions.

Output voltage:

Refers to the nominal value of the voltage appearing between the output terminals.

Output current:

Refers to the maximum nominal output current value under the specified working conditions.

The relationship between power, voltage and current:

The formula is: power = voltage × current (P=U×I).

Conversion efficiency:

Refers to the percentage of the total output power of the power supply to the input active power.

Switching frequency:

Refers to the number of times the DC voltage is turned on and off per unit time.

Ripple:

Refers to the sawtooth waveform generated by the switching element of the output voltage of the power supply. The ripple value is the difference between the highest peak and the lowest peak. The ideal ripple is a straight line.

Noise:

It refers to normal ripple mixed with some small spike pulses.

Load:

It refers to the devices connected at both ends of the power supply in the circuit.

Protection function:

It means that the internal protection circuits are overload, overheating, overtemperature, overcurrent, overvoltage, undervoltage and short circuit.

Isolation voltage:

Isolation withstand voltage refers to the maximum insulation voltage that two systems without direct electrical connection can withstand. The input and output are completely isolated. Generally, the insulation voltage between the input and output can reach 3000VAC.

Narrow voltage:

[color=rgb(85, 85,(85)]Allow the input voltage to fluctuate within a narrow range, generally 165-265Vac.

Wide voltage:

Allow the input voltage to fluctuate within a wider range, such as AC input wide voltage generally refers to 85-265Vac, DC input wide voltage refers to the ratio of the highest value to the lowest value of the input voltage range is 2:1 or 4:1. Voltage regulation accuracy: Voltage regulation accuracy refers to the percentage of the difference between the actual output voltage and the nominal output voltage under the conditions of nominal input voltage and nominal output load. Load regulation: It refers to the ability of the power supply to provide a stable output voltage when the output load current changes. Rated voltage: It allows the input voltage to fluctuate within a specified range, such as ±10%.

Leakage current:

The current passing through the L line, N line and ground line of the input AC power line.

Power factor:

In an AC circuit, the cosine of the phase difference between voltage and current is called power factor, which is the ratio of active power to apparent power. The commonly used calculation method is cosφ=P/S=P/[(P2+Q2)^(1/2)], where P is the active power and S is the apparent power. Startup time: Startup time refers to the time from when the power input is connected to when the output voltage rises to within the regulation range. Working environment temperature: refers to the temperature of the surrounding air where the power supply is located. Temperature coefficient: refers to the percentage of the output voltage change to the nominal value of the output voltage when the working environment temperature is adjusted within the allowable range under the conditions of nominal input voltage and nominal load.

Casing material:

Currently, there are two types of power module casing materials on the market: metal casing and plastic casing. The metal casing has good heat dissipation and can also shield electromagnetic radiation, but you have to pay attention when routing, as it has both advantages and disadvantages. Load effect: It refers to the percentage of the change in measured output voltage to the nominal value of the output voltage when the output current changes from 20% load to 100% load under the nominal input voltage conditions.

Source effect:

refers to the percentage of the change in output voltage and the nominal value of the output voltage when the power supply is connected to the rated load and the input voltage is adjusted within the allowable range.

Because of the small size of the power module, most of them need to be used with a small number of components. There will also be corresponding reference circuits in the manufacturer's data sheet. There are also product characteristic curves and EMC level descriptions to meet different needs.

85)]Because of the small size of power modules, most of them need to be used with a small number of components. The manufacturer's data sheet will also have corresponding reference circuits. There are also product characteristic curves and EMC level descriptions to meet different needs.

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