1 .product introduced
A. Function requirement (customer)
The product function is control the 1KW and 2KW Loading ,It's based on PIC micr-chip .used in industrial heaters.products need sample and realiable.The modularized distribute control technique, power supply, mechanical shell, hardware, software,network debug diagnosis and safety design of the system characteristic have been described.
B. Parameter requirement (Balance)
1 MCU： use pic for Low-cost
2 reliability： 200000 times test
3 power：220-240V AC 50HZ
4 CC ， ROHS，EMI/C Certificate
C. Feasibility analysis
EE: ok
ME: ok packaging and mechanical shell
Cost analysis: ok swtich is key
Software：ok
other：In addition to the special requirements, it is necessary to meet the requirements for the assembly of the manufacturing circuit board. For details, please refer to the floor technology standard.
2. Circuit designed
A Appropriate programs
B Simulations
Just software debug.
C sch and demo
3 Fireware
a Structure diagram
b Flow diagram
c coding
4 PCB Layout
a Bom : ok
b Layot: ok
c EMI/C : ok
5 DFMEA
A. Functional specifications
Engineer characteristic ok
Function ok
B. Appearance specifications
packaging test ok
Software test ok
reliability test ok
panting Gerber check ok
C.Control characteristics
CPK test 5%
QC Check Pass
D. Safety requirements
Defend jig
General design
W I Work instruction
6 Mass production
we find 5 pcs NG samples： fireware can't record
A Test device
Add a temperature control system in test device.
B CPK ok