pcb layout.pdf - Parts List Semiconductors IC1 AT89C2051...

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Unformatted text preview: Parts List Semiconductors: IC1 - AT89C2051 microcontroller IC2 - ADC0831 analogue-to-digital converter IC3 - MCT2E optocoupler IC4 - 7805, 5V regulator T1 - BC547 npn transistor T2 - BS170 n-channel MOSFET T3 - IRF540 n-channel MOSFET D1 - 6A4 rectifier diode D2-D4 - 1N4007 rectifier diode ZD1 - 7.5V zener diode Resistors (all ¼-watt, ±5% carbon): R1 - 8.2-kilo-ohm R2 - 1.2-kilo-ohm R3, R4, R6-R11 - 10-kilo-ohm R5 - 20-kilo-ohm R12 - 330-ohm Capacitors: C1 C2 C3, C7 C4, C9 C5, C6 C8 Miscellaneous: S1 S2 RL1 XTAL LCD Solar panel Fig. 3: A single-side, actual-size PCB layout for microcontroller-based solar charger - 100µF, 63V electrolytic - 100µF, 16V electrolytic - 0.1µF ceramic disk - 10µF, 16V electrolytic - 33pF ceramic disk - 0.01µF ceramic disk - On/off switch - Push-to-on switch - 12V, 1C/O relay - 12MHz crystal - 16×2 line display - 10-40W - 10A fuse 6. Deep-discharge protection 7. Low battery lock 8. Charging current changes to ‘pulsed’ at full charge 9. Low current consumption Fig. 4: Component layout for the PCB 10. Highly efficient design based on microcontroller 11. Suitable for 10-40W solar panels for 10A load The circuit of the solar charge controller is shown in Fig. 1. It comprises microcontroller AT89C2051, serial analogue-to-digital converter ADC0831, optocoupler MCT2E, regulator 7805, MOSFETs BS170 and IRF540N, transistor BC547, LCD and a few discrete components. Component description is given below. Microcontroller. Microcontroller AT89C2051 is the heart of the circuit. It is a low-voltage, high-performance, 8-bit microcontroller that features 2 kB of Flash, 128 bytes of RAM, 15 input/output (I/O) lines, two 16-bit timers/counters, a five-vector two-level interrupt architecture, a full-duplex serial port, a precision analogue comparator, on-chip oscillator and clock circuitry. A 12MHz crystal is used for providing the basic clock frequency. All I/O pins are reset to ‘1’ as soon as RST pin goes high. Holding RST pin high for two machine cycles, while the oscillator is running, resets the device. Power-on reset is derived from resistor R1 and capacitor C4. Switch S2 is used for manual reset. Serial ADC. The microcontroller monitors the battery voltage with the help of an analogue-to-digital converter. The ADC0831 is an 8-bit successive approximation analogue-to-digital converter with a serial I/O and very low conversion time of typically 32 µs. The differential analogue voltage input allows increase of the 68 Solar Charger For Dusk-To-Dawn Use ...
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  • Winter '18
  • PATEL SIR
  • pcb layout, transistor BC547

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