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How to calculate the transient power disspation by Hspice?

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leonken

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power disspation

I want to analysis the power dissipation of a switched power supply circuit using Hspice.
I have some problems:
1. For the input voltage source, the current flow through it is not a constant.
Shoud I use voltage* RMS current or voltage*average current or some other method to calculate the power dissipation of the input source?
2. For the switche, the voltage acorss it and the current flow through it are not a constant. Should I use RMS voltage* RMS voltage or average voltage*average current to calculat the poewer dissipation? or some other method?
3. The command .meas avg/ rms is suitable for calculating the power dissipation? or some other method in Hspice?
 

rms 功率 hspice

实际功率与视在功率的定义:
电路实际功率定义为一个电源周期内瞬时电压与电流乘积的平均值;
视在功率则简单地定义为均方根 (rms) 电压与电流的乘积
电压与电流波形相同且同相，则实际功率与视在功率相等。
So, the power consumption you mentioned should be V * avg(I). right?

Best regards,
Philip
 

hspice power dissipation

Usually, I use 'average' in switching-power supply.
You can print the power directly in HSPICE.
.print tran p(??) power
This is transient power.
If you want to get average power, you can use this command:
.meas tran p_avg avg p(??) from=?? to=??
Normally, the simulation need transient start-up process.
So we can get rid of some start-up time using this command.
 
average power consumption hspice command

Thank you all of you.
I got it.
 

hspice average current

Check the discussion on:


Rgds
 

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