Based on the ATmega16 controller with enhanced AVRRISC structure, a DC electronic load meter was designed and fabricated. The system compares the sawtooth wave and current sampling signal generated by the ramp generator with the error signal of the control signal to generate a PWM wave control MOSFET tube of about 20 kHz, and then adjusts the PI of the error amplifier to form a closed loop negative feedback control loop to achieve constant flow. The constant resistance and constant voltage modes are implemented by software to adjust the current flowing through the MOS transistor circuit in real time. The measured data shows that the accuracy of the system in constant current mode is within 1%, and the accuracy in constant resistance and constant power mode is within 3%.
1. Power on: Press the power switch on the panel switch below to warm up for 10 minutes.
2. Constant current operation: I-SET button, input a current value through the number keys or knob, press ENTER key to confirm.
3. Constant power operation: P-SET, input a power value by numeric key or knob, press ENTER key to confirm.
4. Constant resistance operation: Press R-SET, input a resistance value through the number keys or knob, and press ENTER to confirm.
5. Constant voltage operation: Press V-SET, input a voltage value through the number keys or knob, and press ENTER to confirm.
6, IN ON / OFF input settings:
7. Press the ON/OFF button to change the input state of the load. Press once and the panel displays ON, indicating that the load is in the input state.
8. Press the ON/OFF button again. If 0FF is displayed on the panel, the load is off.
9. Press the ON/OFF button again, and the panel displays OFF, indicating that the load is off.
10, battery discharge test
11. Press the ON/OFF button to turn off the input state of the load and connect the battery to be tested.
12. Press the I-SET button to set the battery discharge current and press the ENTER button to confirm.
13. Press Shift+battery to set the shutdown voltage and ENTER to discharge.
14. Press Shift+battery to exit the battery test. Press the up and down keys to observe the voltage of the battery during the test. , current, power, discharge capacity.
15, automatic test:
A. Press shift+menu to enter the menu and the VFD displays CONFIG. Press the â–¼ key again to move the maximum T SET item required by the LIS, press enter to enter the next menu, and the VFD displays MODE SET. Press â–¼ to move EDIT TEST FILE, press enter to start the automatic test file, and VFV displays MAX CURR. =20A, set the maximum current required, press enter to confirm.
B. The VFD shows the MAX VOLT. =120V, set the maximum voltage required, press enter to confirm.
The VFD shows MAX POWER. =200W, set the maximum power required, press enter to confirm.
C. VFD shows TEST COUNT=2, set the number of test steps required, up to 20 steps, press enter to confirm.
D. Set the mode of the current program, press â–², â–¼ to select the constant voltage. Constant current. Constant power. Constant resistance mode, press enter to confirm.
Enter confirmation.
E. The VFD displays SET1=20A, sets the current value of the current program, and presses enter to confirm.
F. To set whether the current program is shorted, press â–²,â–¼ to select SHORT ON. SHORT OFF mode, press enter to confirm.
G. Set the value that the current program needs to test. Press â–², â–¼ to select the read current, read voltage, read power mode, and press enter to confirm.
H. The VFD displays MINI=120V, set the down line of the test value, and press enter to confirm.
I. The VFD displays MAXI=120V, set the test value to go online, and press enter to confirm.
J. VFD shows DELAY1=1.0S, test delay time, press enter to confirm.
K. Repeat 5 steps to set other conditions
M. VFD displays STORE TEST FILE, save the edited file to EEPROM, press 1 to save to the first group area, and then press ENTER to confirm (up to 8 sets of test files can be saved)
A. Press shift+menu, VFD displays CONFIG, press â–¼ to LIST SET item.
B. Press enter to enter the next menu, VFD displays MODE SET, press â–¼ to CALL TEST FILE
C. Press enter to call back the original test file.
Start automatic testingA. Press shift+I-Set to enter the automatic test function. The VFD displays the file name of the current test file.
B. Press enter to observe the current actual load voltage, current value and current test steps
C. Press shift+trigger to test automatically
D. After the automatic test is completed, the beep will prompt, the VFD will display the test result, and the pass will display PASS. Otherwise, the FAULT, â–², â–¼ keys can observe the test value and test result of each step.
E. Press ESC to exit the automatic test function.
PrecautionsCheck if the voltage setting of the load matches the supply voltage and if the fuse is bad.
Basic inspection method and maintenanceTurn on the power, check the panel display value and the working status indicator is normal;
The instrument should be regularly sent to an external school. The verification period is one year.
The role of the electronic load meter:It is designed for the needs of various power plants, nuclear power plant operating power 220V [2] battery pack capacity testing, maintenance, etc. It is a safe and portable intelligent DC discharge load, suitable for 220V battery maintenance test with capacity less than 3000AH.
The device can also be connected with the battery pack online capacity monitoring device (BCSU). When the battery pack is discharged, when the terminal voltage of any single battery reaches the set cutoff voltage value, the BCSU will notify the BDCT to stop discharging. Avoid any battery over-discharge and cause damage to the battery.
Although this test method is similar to the traditional test method, it does not need to manually adjust the load current and record, and can easily obtain the required data and various analysis curves. At the same time, the intelligent load is small in size, light in weight, easy to handle, and adopted. Special high-efficiency electric heating element, does not produce red hot phenomenon, does not raise the ambient temperature, and has various protection functions to facilitate long-time unattended discharge and automatic test recording, especially suitable for battery acceptance and verification. Use in discharge test and regular deep discharge.
The electronic load is a power electronic device designed based on power electronics technology, computer technology and automatic control technology; it can simulate various load characteristics, and has the advantages of flexible use and energy saving. Used to test the power supply, perform reliability test (aging discharge test) and output characteristic test on the power supply to test its technical specifications and performance. The electronic load is divided into DC electronic load and AC electronic load. According to whether the energy is fed back to the power grid, it is divided into a feed-type electronic load and an energy-consuming electronic load. The application diagram is as follows (the picture cannot be inserted, and the text and symbols are used instead):
Tested - electronic - electricity
Power supply - load - network
The electronic load causes the output port of the tested power supply to exhibit the simulated load characteristics, such as simulating a 50 ohm resistor. The measured power supply is a DC constant voltage source, 50V. The function of the DC electronic load is to adjust the current of the DC power supply. = 50 volts / 50 ohms = 1 amp, so that the characteristics of the power supply output meet Ohm's law.
That is to say, the output voltage of the tested power supply is 50V, and the current is 1A, so the electronic load is equivalent to a 50 ohm resistor. The DC power supply is a power supply, and the electronic load is used to test the power supply (equivalent to a real load). The DC electronic load can be used to test the DC power supply. The two are different.
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