Introduction
12 VDC to 120 VAC Inverter
Juan Tello
Summary
Background How the circuit works?SimulationTestingApplicationsConclusion
The Circuit
Schematic using Simplorer
TWT
TWT1
TWT
TWT2
DIODE51
DIODE52
R1
R2
C1
C2
R3
R4
NPN51
NPN52
C3 R5
Simulation Output
Half Circuit R4 & C2
Just One Cycle
Half Circuit D1 & R1
One Cycle
Half Circuit VCE2 & TV1
One Cycle
Half Circuit One Cycle
Half Circuit Analysis
During Positive Cycle
D1 is closed
Q2 is open
C1 is discharging
T2-V1 is negative voltage
The Other Half Circuit
Simulation Summary
During Positive Cycle
Bottom Top
D1 is closed D2 is open
Q2 is open Q1 is closed
C1 is neg. C2 is zero
T2 is neg. T1 is Neg. Const.
Simulation Summary
During Negative Cycle
Top Bottom
D1 is closed D2 is open
Q2 is open Q1 is closed
C1 is neg. C2 is zero
T2 is neg. T1 is Neg. Const.
Real Circuit—Top View
Real Circuit—Bottom View
Transformer from a Microwave
Transformer and Circuit
Testing the circuit
Oscilloscope
Oscilloscope closed up
Measuring with a Voltmeter
Problems and Solutions
Capacitors of 68uF were replaced with 2-33uF and 1-2.2uF
Steel wire was used in the primary winding on transformer instead of copper wire
Frequency = 1.3kHz No solutionVp-p = 40V No solution
Application
Automobile
- TV’s
- DVD’s
- VCR’s
- Other household appliances
Conclusion
Advantages
- Low cost
- Easy to built
Disadvantages
- Reliability
- Efficiency
Conclusion (continuation)
Who makes this productFuture work
- Further investigation to solve present problems: frequency, output voltage, load variation