Power Supply Control Feedback Control. Power Supply Control Lesson Objectives When you finish this lesson you will understand: Secondary Current Control.

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Presentation transcript:

Power Supply Control Feedback Control

Power Supply Control Lesson Objectives When you finish this lesson you will understand: Secondary Current Control Phase Shift Heat Control Spot Weld Quality Testing Equipment Monitoring Feedback Control Learning Activities 1.View Slides; 2.Read Notes, 3.Listen to lecture 4.View Demo 5.Do on-line workbook 6.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

Configurations for Spot Welding Transformers (a) Stacked, Shell Type (b) Stacked, Core Type(c) Wound Type

Transformer Tap Switch EsEs VpVp

Parallel/Series Tap Switches EsEs EsEs EsEs EsEs VpVp S1S1 S1S1 S2S2 S2S2 P2P2 P2P2 P1P1 P1P1 VpVp (a) Parallel (b) Series

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

Electrode Force Gage

Equipment Arrangement Power Supply Strain Gage Signal Conditioner Voltage Leads Tap Displacement Transducer Isolation Box Integration Data Recorder Print Oscilloscope