Power Supply Control Feedback Control. Power Supply Control Lesson Objectives When you finish this...
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Transcript of Power Supply Control Feedback Control. Power Supply Control Lesson Objectives When you finish this...
Power Supply ControlFeedback Control
Power Supply Control
Lesson ObjectivesWhen you finish this lesson you will understand:• Secondary Current Control• Phase Shift Heat Control• Spot Weld Quality Testing• Equipment Monitoring• Feedback Control
Learning Activities1. View Slides; 2. Read Notes, 3. Listen to lecture4. View Demo5. Do on-line
workbook6. Do Homework
Keywords: Transformer, Tap Setting, Primary Current, Secondary Current, Silicon Controlled Rectifier, Electrode Force, Power Factor, Toroid, Hall Effect Transducer, Linear Voltage Differential Transformer, Dynamic Resistance
Block Diagram of Single-Phase Spot Welder
Spot Weld
Main Power Line
Contactor
Transformer Tap SwitchEs
Vp
Parallel/Series Tap SwitchesEs Es
EsEs
Vp
S1
S1
S2
S2
P2
P2
P1
P1Vp
(a) Parallel
(b) Series
N=np/ns
Vs= Vp/N
Is = Ip N
60 C
ycle
AC
Rules for SCR Conduction• can conduct when anode is + with respect to cathode• once initiated, can only be stopped by removal of anode voltage• initiated by a pulse on ignitor
Phase Shift Heat Control
(a) Current Controlled by Tape Settings
(b) Current Controlled by Phase Shift Setting
Link to:
Phase Shift Heat Control Demo
60 C
ycle
AC
Electrode
Electrode
Force Gage
Equipment ArrangementPowerSupply
Strain Gage Signal Conditioner
VoltageLeads
Tap
Displacement Transducer
IsolationBox
Integration
DataRecorder
Oscilloscope