Document Revision No.: 1 Revised: 03/20/14 RIT KGCOE MSD Program

P14043 Smart Cane

Electronics Test Plans & Test Results

Table of contents

1. Analog voltage measurement 2

1.1. Function 2

1.2. Test Equipment 2

1.3. Data Collection 2

1.4 Analysis of Data……………………………………………………………………………………...5

1.5 Conclusion………………………………………………………………………………………….5

2. Voltage Limit Testing 6

1.1. Function 2

1.2. Test Equipment 2

1.3. Data Collection 2

1.4. Analysis of Data 5

1.5. Conclusion 5


P14043 Smart Cane

1.  Analog Voltage Measurement

1.1.  Function

Subsystem/ Function/ Feature Name: Power Management System

Date Completed:

Performed By: William McIntyre

Tested By: William McIntyre

Engr. Spec. # / Specification / Unit of Measure / Marginal Value / Comments/Status
S7 / Circuit Voltage / V / 12 / The customer wanted to have a circuit board that did not exceed 12 volts for battery life, compatibility and safety considerations

1.2.  Test Equipment

ID # / Instrumentation or Equipment
1 / B1 (Fully populated Power Management Board)
2 / Oscilloscope
3
4

1.3.  Data Collection

1.3.1.  Test Procedure

The test will be done when the power management board is in two states. The first state is when the batteries will be charged. To activated this mode, 12 VDC will connected to the circuit between WW+ and WW-. The current sensing capabilities of BQ24618 will then stop the batteries from powering the power management circuit and because of the R31 modification, the power management system will not be powered to ensure all power is dedicated to charging the Lithium Ion batteries. The circuit will then be probed using the oscilloscope, as described below to ensure the correct voltages and waveforms are present. (NOTE: All reference points are tied together thus all DC Voltages are with respect to all grounds)

To activate the second state, the voltage connected to WW+ and WW- will be removed, shutting off the battery charge system and activating the power management system which supplies power to the rest of the PCB. Again the circuit will be probed using the oscilloscope as described below to ensure the correct voltages and waveforms are present.

1.3.2.  Sampling Points

Figure 1 below illustrates where the circuit should be probed to ensure the proper voltages being produced during the battery charging state. Since no power will be supplied to the rest of the circuit, as long as TP2 is verified as 0 VDC, the rest of the circuit will not need to be tested.

Figure 1: Test points and theoretical voltages when the circuit is in the battery charge state.

Figures 2 and 3 below illustrate where the circuit should be probed when the batteries are supplying power to the power management system.

Figure 2: Test points and theoretical voltages when the power management system is being powered by the batteries

Figure 3: Test points and theoretical voltages when the power management system is being powered by the batteries

1.3.3.  Logistics

The test will be performed in the senior design electronics laboratory (9-3000) and will be logged in a project notebook and documented on an excel spreadsheet.

1.4.  Analysis of Data

1.5.  Conclusion

2.  Voltage Limit Testing

2.1.  Function

Subsystem/ Function/ Feature Name: Power Management System

Date Completed:

Performed By: William McIntyre

Tested By: William McIntyre

Engr. Spec. # / Specification / Unit of Measure / Marginal Value / Comments/Status
S7 / Circuit Voltage / V / 12 / The customer wanted to have a circuit board that did not exceed 12 volts for battery life, compatibility and safety considerations

2.2.  Test Equipment

ID # / Instrumentation or Equipment
1 / B1 (Fully populated Power Management Board)
2 / Oscilloscope
3 / Power Supply
4

2.3.  Data Collection

2.3.1.  Test Procedure

The test will be done when the power management board is in two states. The first state is when the batteries will be charged. To activated this mode, a DC voltage will connected to the circuit between WW+ and WW-. (TP1) Starting at 3 VDC, the voltage will be step up to 26VDC in 1VDC intervals. Test point 2 and 3 will then be measured.

Next the voltage will be removed from WW+ and WW- and the battery management chip BQ24618 will be disconnected from the power management circuit to ensure the safety of the device. A DC voltage will then be applied to TP2. Starting at 0 VDC, the voltage will step up to 10VDC in 1 VDC intervals. Test points 5 and 6 will then be measured.

2.3.2.  Sampling Points

Figure 3 below illustrates where the circuit should be probed to ensure the proper voltages being produced during the battery charging state.

Figure 1: Test points and theoretical voltages when the circuit is in the battery charge state.

Figures 4 and 5 below illustrate where the circuit should be probed when the applying a voltage to TP3

Figure 2: Test points and theoretical voltages when the power management system is being powered by the batteries

Figure 3: Test points and theoretical voltages when the power management system is being powered by the batteries

Test with BQ2418 / Voltage in(TP1) / TP2(V) / TP3 (V) / Test without BQ2418 / Voltage in(TP2) / TP4(V) / TP5 (V) / TP6 (V)
3 / 0 / 0 / 0 / 0
4 / 1 / 0 / 0 / 0
5 / 2 / 0 / 0 / 0
6 / 3 / 0 / 0 / 0
7 / 4 / 0 / 0 / 0
8 / 5 / 0 / 3.08 / 3.8
9 / 6 / 0 / 3.08 / 4.61
10 / 7 / 0 / 3.08 / 4.94
11 / 8 / 0 / 3.08 / 4.95
12 / 9 / 0 / 3.08 / 4.97
13 / 10 / 0 / 3.08 / 4.97
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Results / Name / Date / Comments
Test with BQ2418
Test with BQ2418

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