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P12441: Thermoelectric Stove for Haiti 1 High/Low Voltage Disconnect Test Procedure 1. Test Name: High/Low Voltage Disconnect Test Author: Andrew and Xiaolong The high voltage disconnect is integrated to protect the battery from overcharging and low voltage disconnect is integrated to disconnect the USB and fan so the battery will have enough power to restart the system for one hour. 2. Required Equipment Equipment Description Quantity 1 Power Supply 2 2 3 Oscilloscope HV/LV disconnect system 1 1 Settings PS1: 12V PS2: Variable Trigger on the rising/falling edge Table 1: Required equipment and its settings. 3. Test Procedure Step 1: Build the HV/LV disconnects system as seen in the system schematic. Step 2: Connect the power supply to the +12V rails of the circuit. Step 3: Connect the output of power supply two to the battery terminal pins of the circuit. Step 4: Adjust the output of power supply two to 6.2V, slowly increase it by hundredths of a volt until the battery is disconnected from the circuit. Record the voltage. Step 5: Adjust the output of power supply two to 5.8V, slowly decrease it by hundredths of a volt until the USB output and fan output are disconnected. Record the voltage. 4. Test Results Step # 1 2 Description High Voltage Disconnect Voltage Low Voltage Disconnect Voltage Spec Measurement Voltage: 6.2V +/- 5% 6.24V Voltage: 5.8V +/- 5% 5.8V Table 2: The results of the test procedure. P12441: Thermoelectric Stove for Haiti 2 High/Low Voltage Disconnect Test Procedure Figure 1: Output voltage drops when the battery terminal voltage reaches 6.24V Figure 2: Output Voltage drops when the battery terminal voltage goes below 5.8V 5. Pass/Fail Did the unit pass or fail the test? Defend your decision. PASS FAIL Pass Table 3: PASS/FAIL