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Test Name_ High_Low Voltage Disconnect - Edge

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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                             Settings
                                                                                   PS1: 12V
  1                Power Supply                    2
                                                                                 PS2: Variable
  2               Oscilloscope                     1                   Trigger on the rising/falling edge
  3          HV/LV disconnect system               1
                                  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 #             Description                              Spec                          Measurement
  1          High Voltage Disconnect
                                                  Voltage: 6.2V +/- 5%                        6.24V
                     Voltage
  2          Low Voltage Disconnect
                                                  Voltage: 5.8V +/- 5%                         5.8V
                     Voltage
                                    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

				
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posted:10/3/2012
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