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In This Chapter
-
Power Supplies for Modern Induction Heating
- Power–Frequency Combinations
- Elements of Power Electronics
- Types of IH Power Supplies
- Rectifier or Converter Section
- Full-Bridge Uncontrolled Rectifier
- Phase-Controlled Rectifier
- Uncontrolled Rectifier followed by Regulator
- Active Three-Phase Rectifiers
- Importance of Good Input Line Power Factor
- Input Line Harmonics and Their Reduction
- Inverter Section
- Full-Bridge Inverter
- Half-Bridge Inverter
- Voltage-Fed Inverters with Simple Series Load
- Voltage-Fed Inverter with Series Connection to a Parallel Load (LC-LC)
- Voltage-Fed Inverter with Series Inductor Connected to a Parallel Load (L–LC)
- Full-Bridge Current-Fed Inverters
- “E” Bridge Current-Fed Inverter
- Single-Switch Inverter
- Advances in Power Supply Control
- Operational Considerations
- Load Matching
- Prelude to the Discussion of Load Matching
- Understanding Load Matching for IH
- Basic Concept
- A Simple Example
- Parallel and Series Connected Load Circuits
- Load-Matching Procedures
- Matching the Parallel Resonant Load
- Matching the Series Resonant Load
- Trial-and-Error Method of Load Matching
- Load-Matching Component Connections
- Summary
- Medium- and High-Frequency Transformers for Heat Treating and Mass Heating
- AC/DC Reactors
- Instrumentation Transformers
- Heat Station Transformers
- Ferrite-Core Transformers
- Toroidal Transformers
- Integrated Magnetic Transformers
- Rectangular (C-Core) Transformers
- Narrow-Profile Transformers
- Air-Core Radio Frequency Transformers
- Maintenance, Sizing, and Specification of Transformers
- Special Considerations for Power Supplies
- Duty Cycle
- Rapid Cycling of Heat On and Off
- Precise Control of Power and Time
- Minimum Utilization of Floor Space
- Special Considerations for Induction Brazing, Soldering, and Bonding
- Special Considerations for IH Power Supplies in Mass Heating Applications
- Special Considerations for IH Power Supplies in Strip Processing Applications
- Simultaneous Dual-Frequency Power Supplies
- Inverters with Independent Frequency and Power Control
- Power Supply Cooling
- Water Quality
- Cooling Water Flow Rate
- Cooling Water Recirculating Systems
- Common Water-Cooling Problems
- Process Control, Monitoring, and Quality Assurance
- Prelude to Discussion of Process Control and Monitoring
- Specifics of Control and Monitoring of Induction Heat Treating
- Specifics of Control and Monitoring of Induction Mass Heating
- Meters and Meter Circuits
- Features of Control/Monitoring Strategies for Induction Heat Treating versus Induction Mass Heating
- Basic Principles of Feedback and Control Algorithms
- Open-Loop Systems (Feedforward Control Systems)
- Closed-Loop Systems (Feedback Control Systems)
- ON–OFF Control Algorithms
- P, I, D, PI, and PID Control Algorithms
- PLC Controller
- Controller Tuning
- Energy Monitoring
- Profile/Signature Process Monitoring
- Protective Devices and Safety Principles
- Final Remarks
Abstract
Induction heating (IH) power supplies are frequency changers that convert power at the available utility line frequency to single-phase power at a frequency appropriate for the particular IH application. They are often referred to as converters, inverters, or oscillators, but they are generally a combination of these. The converter portion of the power supply converts the line frequency alternating current (AC) input to direct current (DC), and the inverter or oscillator portion changes the DC to single-phase AC at the required heating frequency.
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