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# 02 weekly report (20 april 2012)

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Ms.Pornprom Nisaimun INC 2B 54261518

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### 02 weekly report (20 april 2012)

1. 1. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] April 20, 2012 Name-Surname Ms. Pornprom Nisaimun Student ID. 54261518 Group Name Instinct M 53211801 Kung 54261502 Boss 53211808 Mic 54261507Engineering Team Yui 53211835 Arm 54261510 Members Ball 53211836 Garfield Top Ice Product Design P’Jub Team Members P’PloyWeekly Progress I was Power Supply circuit design responsible. In duration 2 last week ago, I have worked as follows: 1. Found the information about battery, and I choose to use battery LI-PO (Lithium-ion Polymer Battery) because it is small (W x L x T = 44 x 67 x 10.7 mm), light, and can distribute current more than its capacity so much. (Page 5) 2. Designed charger circuit by using LM317 because I can vary output voltage from 1.2 V to 37 V 3. Bought the battery and electronic devices to make an experiment of Power Supply circuit. (Details of the experiment on page 2 to 4) 4. Design PCB of charger circuit. (Page 4) 5. Approximated of budget (Page 5)Engineering AnalysisStrong Point - Both charger circuit, and power supply 5 V and 6 V can operate. - Size of PCB and battery can put into product.Week Point - LM317 in charger circuit is too hot. I think that may be cause of high current to charge battery. - IC regulator 7806 cannot retain output voltage when input voltage decrease <7.2 VNext Week Job - Design new charger circuit by add current regulator circuit to solve the problem about temperature. - Design alarm circuit when output voltage of 7806 less than 6 V. - Design new PCB of charger circuit. Department of Control System and Instrumentation Engineering KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI
2. 2. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] April 20, 2012 The experiment of Power supply circuit1. Charger circuit test by using 4.2 V, 2 A Calculation min Circuit Test Battery Switching transformer Fig 1.1 Charger circuit test Results V before 30 min 60 min 90 min 120 min 150 min charged 3.2 V 3.5 V 3.6 V 3.6 V 3.6 V 3.6 V Summary Charger circuit by using LM317 with 4.2 V, 2 A can charge battery LI-PO 3.7 V, 1500 mAh in about 60 minutes of time period. Department of Control System and Instrumentation Engineering KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI
3. 3. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] April 20, 20122. Power supply 5 V and 6 V circuit test Object - To ensure that 7.4 V of input voltage can generate output voltage 6 V and 5 V by IC regulator 7806 and 7805 - To find critical input voltage that the IC regulator cannot retain output voltage to 6 V and 5 V Test circuit Fig 2 Power supply 5 V and 6 V circuit by using LM317 to generate voltage apply to input of 7806 and 7805 Results Vin Vout 7806 (J2) Vout 7805 (J3) 6.8 V 5.6 V 5.15 V 7.0 V 5.8 V 5.15 V 7.2 V 6V 5.15 V 7.4 V 6.2 V 5.15 V 7.6 V 6.4 V 5.15 V 7.8 V 6.4 V 5.2 V Summary IC regulator 7805 can retains voltage output well while IC regulator 7806 will retain certainly output voltage at input voltage >=7.2 V. So if we use two series of 3.7 V to make voltage 7.4 V and apply to input of IC regulator, we can generate output voltage 6 V and 5 V. However, we have to ensure that Gas sensor (use supply voltage 6 V) can operate with this condition. Department of Control System and Instrumentation Engineering KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI
4. 4. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] April 20, 2012 LI-PO 7.4 V, 1500 mAh (3.7 V x 2 ) Fig 3 As-built circuit3. The size of PCB charger circuit 24 mm 20 mm 46 mm Department of Control System and Instrumentation Engineering KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI
5. 5. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] April 20, 20124. The approximation of budget Price/each TotalNo. Details Amount Shop Baht Baht1. Switching transformer 12 VDC, 2 A 150 1 140 0-2222-2. DC Jack 10 1 10 4990, 0-2222-84763. Battery LI-PO 3.7 V, 1500 mAh 150 2 300 3D 0-2221-5768, 08-9230-78944. C 0.1 uF/50 V 1.10 3 3.35. C 10 uF/50 V 1.10 1 1.106. C 1 uF/50 V 1.10 1 1.107. C 0.33 uF/50V 1.10 1 1.108. LM317TG 9 1 99. R 240 Ω ¼ W 0.12 1 0.1210. POT 5 kΩ 25 turns 25 1 25 (NPE) 0-2225-11. MC7805 6.50 1 6.50 0094, 0-2225-252812. L7806 7.20 1 7.2013. Connector Male WKH-N02BIT-L 0.75 4 314. Connector Female WKH-C02B 1 4 415. PCB Tab Vertical 1 2 216. Spring 20 2 40 Total budget 553.42*Note As the approximation dose not add VAT.5. The comparison to LI-PO Battery table (mm) Price Capacity Voltage Weight Datasheet W L T (Baht) 1350 mAh 7.4 V 35 67 14 80 g 618 with 1350 mAh 7.4 V 35 69 21.7 89 g 390 without 1500 mAh 7.4 V 44 67 10.7 - 300 without Department of Control System and Instrumentation Engineering KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI