power supply control feedback control. power supply control lesson objectives when you finish this...
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Power Supply ControlFeedback Control
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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
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Block Diagram of Single-Phase Spot Welder
Spot Weld
Main Power Line
Contactor
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Transformer Tap SwitchEs
Vp
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Parallel/Series Tap SwitchesEs Es
EsEs
Vp
S1
S1
S2
S2
P2
P2
P1
P1Vp
(a) Parallel
(b) Series
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N=np/ns
Vs= Vp/N
Is = Ip N
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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
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Phase Shift Heat Control
(a) Current Controlled by Tape Settings
(b) Current Controlled by Phase Shift Setting
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Link to:
Phase Shift Heat Control Demo
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60 C
ycle
AC
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Electrode
Electrode
Force Gage
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Equipment ArrangementPowerSupply
Strain Gage Signal Conditioner
VoltageLeads
Tap
Displacement Transducer
IsolationBox
Integration
DataRecorder
Oscilloscope
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