Electronic load device for power supply product to be tested and method for regulating bandwidth thereof
An electronic load device provided for testing an OT (power supply to be tested) and the working bandwidth is regulated and set according to the output impedance of the OT. The electronic load device comprises a CPU, an impedance-bandwidth table, a voltage-current measurement unit, a power stage and a control module. Firstly, a current pulled out from the OT to the power stage is called by the CPU. Thereafter, an output impedance of the OT is measured by the voltage-current measurement unit and analysis by the CPU. Next, a working bandwidth of the electronic load device is regulated and set by the control module according to the output impedance and the impedance-bandwidth table.
1. An electronic load device, provided for testing an OT (power source product to be tested), comprising:
a central process unit (CPU);
a voltage-current measurement unit, to measure an output impedance of the OT and output the output impedance signal to said CPU;
a power stage connected with the OT so that said power stage is simulated as a load for the OT;
a control module receiving a first signal and a second signal from said CPU so as to control said power stage, wherein said first signal is a current pulled out command, and said second signal is a bandwidth range setting command;
an impedance-bandwidth table connected with said CPU;
so that said electronic load device can regulating an bandwidth range according to the output impedance of the OT, after the output impedance of the OT is measured.
2. The electronic load device according to claim 1 wherein said control module; comprise an analog controller, a bandwidth regulating module, and said bandwidth regulating module receives said second signal and accordingly, provides said bandwidth range to said analog controller.
3. The electronic load device according to claim 1 wherein said second signal depends on said impedance-bandwidth table and the output impedance of the OT.
4. A method for testing an OT (power source product to be tested) by using a electronic load device, said electronic load device having an impedance-bandwidth table so that a working bandwidth range will be regulated and set according to an output impedance of the OT, comprising the steps of:
sending a first signal to a control module from a CPU so as to pull out an outputting current from the OT to a power stage;
measuring the outputting current and a terminal voltage of the OT;
calculating the output impedance of the OT,
outputting a second signal to said control module according to the output impedance and said impedance-bandwidth table;
regulating and setting the working bandwidth range of the electronic load device according to said second signal by said control module.