3-PHASE THYRISTOR CONTROLLED CHARGER
USING PIC MICROCONTROLLER
Guided by: Mr. TUSHAR PATEL Internal Guide: Mr. MIHIR PATEL &
(SUVIK ELECTRONICS PVT. LTD.) Mr. PAURAV NAYAK
(S.P.B. PATEL ENGINEERING COLLEGE,
Selection of battery charger topology
Selection of topology for converter
Design of controlled circuit
To develop software for microcontroller
Selection & design of filter
Design of feedback loop
FLOW OF PRESANTATION
Basic of Battery Charger
Introduction of PIC Microcontroller
Thyristor power module
Design of Filter
Simulation of Power module
Experimental result of power module
Conclusion and Future scope
introduction & specification
Aim of battery charger is to charge a rechargeable battery.
For this using ac-dc converter for rectification.
driving the thyristor in on state, generate pulses for trigger with
the help of microcontroller.
For drive the microcontroller, required controlled card.
Getting the smooth DC output without ripple, design filter for
If change in input, then output will be constant. For that design of
Specification of charger is to develop 120 V DC constant voltage
and 10 A constant current .
General block diagram of project
Basic of battery charger
A battery is a device that stores energy for long time using the
process of electro-chemical and only release when the user
Different types of batteries
Nickel cadmium (Ni- cd)
Nickel- metal Hydride (NiMH)
Lithium Ion (Li- ion)
Lithium Ion Polymer (Li ion polymer)
Different charging methods for battery
COMPARISION CONSTANT CURRENT CONSTANT TWO-STEP
POINTS CAHRGING VOLTAGE CHARGING CHARGING
CONSTANT TERM Current Voltage First Current,
INITIAL POSITION OF Voltage Gets High Current High And Decreases First Current High For Voltage
CURRENT AND Slowly Reach At The Reference Level
VOLTAGE Then Voltage Gets Constant
CHARGING TIME Rapidly Fast Fast
OVER-CHARGING Degradation In Battery Life Reduce The Battery Capacity Reduce The Battery Life
ADVANTAGE Fast Charging Fast Charging For Critical Advantage Of Both Of CC and
Different type of battery charger
SCR bridge charger
Switch mode charger
Block diagram of SCR bridge battery charger
Controlled card supply the voltage to the specific component for
doing its work.
Controlled card include voltage regulator which is generate
+12ve volt, -12ve volt, +5ve volt.
Zero crossing detector generate zero crossing signal from the
output of the op-amp, output has its peak to peak from +vcc to –
AND gate IC operate from the input of zero crossing signal and
+5ve volt which shift its level from 0 volt to +5ve volt
Generated 3 signal has 120 deg. Difference phase angle between
each other, that is applied to microcontroller.
Introduction of PIC microcontroller
Features of PIC microcontroller
High-Performance RISC CPU
Special Microcontroller Features
• I/O ports
• PORTA and TRISA register
• PORTB and TRISB register
• PORTC and TRISC register
• PORTD and TRISD register
Different • PORTE and TRISE register
module of PIC • A/D Converter Module
microcontroller • ADCON0 register
• ADCON1 register
• PWM period
• PWM duty cycle
• TIMER MODULE
• TIMER0 module
• OPTION_REG register
• INTCON register
Different • TIMER1 module
• T1CON register
module of PIC • TIMER2 module
microcontroller • T2CON register
• INT Interrupt
• TMR0 Interrupt
• PORTB INTCON change
Function of driver circuit is to switch a power semiconductor device
from the off state to on state and vice versa.
The drive circuit is the interface between the controlled circuit and
The drive circuit amplifies the control signals to levels required to
drive the power switch and provides electrical isolation where
required between the power switch and the logic level.
THYRISTOR POWER MODULE
Line commutated controlled rectifier
Three phase half-wave rectifier
Three phase full-wave rectifier
the mean output voltage is given by
Vdc Vm cos
Design of filter
Filters are electronic circuits which perform signal
processing functions, specifically to remove unwanted frequency
components from the signal, to enhance wanted ones, or both.
Output voltage from rectifiers consists of dc component plus ac
component, or ac ripple.
AC component merely causes more ohmic losses in the circuit
leading to reduce the efficiency of the system. So the importance
of filter in output is high.
Types of filter
Ripple factor in L-C filter has lower value than that obtained by either L-filter or C-filter
for the same values of L and C.
Use of L-C filter for reducing the ripple from the output voltage of a full wave rectifier.
The inductor L blocks the dominant harmonics.
Capacitor C provides an easy path to the nth harmonic ripple currents.
D * VRF * Vo
CRF * Vo * fsw
D * Io
VRF * Vo * fsw
VRF= Voltage Ripple Factor
CRF= Current Ripple Factor
D= Duty Cycle
fsw= Switching Frequency
Voltage divider equation
Zener diode is used for protection of microcontroller. It can not
passes the voltage over it`s break-down voltage.
SIMULATION OF POWER MODULE
CONCLUTION AND FUTURE SCORE
At present I have presented work related to the programming for
open-loop and close loop operation of module, testing is
performed to close loop operation completely.
The response of the close loop is small so in the future stages, the
response of close loop will made better accurate for the high
efficient and also can take more feedback from the output side,
like current feedback, temperature feedback.