10. Chint Series HB Ring Transformers
- used for controlling power supply in electronic
instruments, household appliances and machine
tool equipments with the circuit
16. Working principle
When the switch is closed:
•Current in primary coil increases
•Creates increasing magnetic field in primary coil
•Induces current in secondary coil
•Lamp lights up
Primary
Coil
Secondary
Coil
Soft Iron Core
17. When current in primary coil becomes steady:
• No more changes in the magnetic field in
primary coil
• No more current induced in secondary coil
• Lamp goes off
When switch is opened:
• Current in primary coil decreases to zero
• Creates decreasing magnetic field in primary coil
• Induces current in opposite direction in secondary coil
• Lamp lights up again
18. The transformer equation relates the number of turns of
wire to the difference in voltage between the primary
and secondary coils.
Vp/Vs = Np/Ns
Where :
Vp = is the voltage in the primary coil.
Vs = is the voltage in the secondary coil.
Np = is the number of turns of wire on the primary coil.
Ns = is the number of turns of wire on the secondary
coil.
19. Improving the efficiency of transformer:
1. Design of the core:
• Use effective soft magnetic material
• Laminated core to reduce the flow of eddy currents
• Ensure that the magnetic field produced by the
primary coil is linked completely to the secondary
coil
2. Use low-resistance copper wires to reduce losing
energy in the
form of heat
