What Is the KGPS Induction Generator Power Supply?

The HLQ KGPS Induction Generator Power Supply is a silicon-controlled rectifier (SCR/thyristor) medium-frequency power converter designed to energize matched induction coils for industrial metal melting, billet heating, forging preparation and selected thermal-processing applications. It converts industrial alternating-current input into controlled medium-frequency electrical power that generates eddy-current heating within conductive metal. The published HLQ range covers KGPS-200 through KGPS-1500, nominally 200–1500kW and 0.5–8kHz, with frequency and input voltage dependent on the model. The generator is one component of a complete heating installation; the coil or furnace, capacitors, cooling equipment, controls and material handling must be engineered for the actual process.

Quick Engineering Answer

For the wider selection context, compare HLQ’s
industrial induction heating power supply systems.

Key Applications

A KGPS generator is selected for the electrical and thermal characteristics of its load. A melting furnace and a continuous billet-heating line may use related medium-frequency power-conversion principles, but require different coils, mechanical systems and acceptance tests.

For ferrous foundry applications, see HLQ’s
induction furnace for melting iron and steel.

Suitable Materials

All electrically conductive metals can in principle be induction heated, but electrical resistivity, magnetic permeability, thermal conductivity, melting point and charge geometry determine the appropriate equipment and process. The values below are indicative application considerations, not validated heating recipes.

Forging and Melting Are Different Thermal Duties

Working Principle

The KGPS system rectifies industrial AC electricity into controlled DC and converts it into medium-frequency AC for a matched induction load. Current through the copper induction coil generates an alternating magnetic field. Eddy currents induced in the metal dissipate energy as heat. Ferromagnetic alloys exhibit additional magnetic effects below the Curie temperature; however, thermal design must account for the strong change in permeability during heating.

Figure 1. KGPS Power Conversion and Load Matching

 THREE-PHASE AC INPUT
          |
          v
 +----------------------+    +---------------------+
 | SCR RECTIFIER        | -> | DC LINK / REACTOR   |
 +----------------------+    +---------------------+
                                      |
                                      v
                            +---------------------+
                            | THYRISTOR INVERTER  |
                            | KGPS CONTROL        |
                            +---------------------+
                                      |
                                      v
                            +---------------------+
                            | RESONANT CAPACITORS |
                            | MATCHED COIL        |
                            +---------------------+
                                      |
                     +----------------+----------------+
                     v                                 v
           SOLID BILLET HEATING                METAL MELTING FURNACE
           Eddy-current heating               Eddy-current heating
           Thermal equalization               Electromagnetic stirring

 SAFETY INTERLOCKS: cooling flow / phase loss / current / voltage

Frequency, Penetration and Temperature

For an approximately uniform conductor, the simplified electromagnetic skin depth is delta = sqrt[2rho/(2 pi f mu)], where rho is resistivity, f is frequency and mu is permeability. The approximation does not independently predict final core temperature in a hot, nonuniform steel billet.

Figure 2. Frequency vs. Simplified Skin Depth in Cold Copper

 COPPER AT ABOUT 20 C; rho = 1.72e-8 ohm*m; mu_r = 1

 0.5 kHz  |##############################|  2.95 mm
 1.0 kHz  |#####################         |  2.09 mm
 2.5 kHz  |#############                 |  1.32 mm
 4.0 kHz  |##########                    |  1.04 mm
 8.0 kHz  |#######                       |  0.74 mm

 Illustrative physics calculation only; not a coil-design guarantee.

Technical Specifications

The table below reproduces and clarifies the 11 published model rows on the HLQ KGPS product page. The source calls the current “inlet current” and labels the kW values “power rate” without specifying whether they are AC real input, DC-link power or inverter output. Therefore, the nominal kW ratings are model designations pending factory confirmation, not independently measured full-load results. The source describes 50Hz input and mentions three- or six-phase input arrangements; the phase and transformer design must be verified by model.

General Specifications

Published KGPS Model Comparison

Important discrepancy: For KGPS-1500, the published 750V / 600A pairing corresponds to only about 779kVA of three-phase apparent input power, which cannot sustain 1500kW of real electrical input. The 750V/600A entry must be corrected or explained before it is used in a quotation. Do not silently treat it as a verified 1500kW rating.

Three-Phase Electrical Cross-Check

S(kVA) = sqrt(3) x V(line-to-line) x I(line) / 1000 and P_real(kW) = S(kVA) x true power factor, for an appropriately measured balanced three-phase supply. Power factor is never greater than 1.

Recommended Model Selection

First estimate the thermal requirement, then validate the appropriate frequency range, coil design, electrical input and full-load performance. The following forging examples assume carbon steel heated from about 20°C to about 1100°C, a specific enthalpy rise of 750kJ/kg, 65% overall electrical-to-workpiece efficiency and 15% design allowance. These are calculation assumptions, not tested KGPS efficiencies.

A model is not approved solely because its published nominal kW exceeds a heat-balance calculation. Continuous line power, converter losses, resonant matching, actual coil coupling, workpiece thermal gradients and the available transformer must also be verified.

Process Workflow

Figure 3. Engineering-to-Commissioning Workflow

 CUSTOMER PROCESS DEFINITION
  Material | Dimensions | kg/h or kg/batch
                 |
                 v
 HEAT LOAD + FREQUENCY STUDY
                 |
                 v
 SELECT KGPS GENERATOR / LINE SUPPLY
                 |
                 v
 DESIGN CAPACITORS + COIL / FURNACE
                 |
                 v
 DESIGN COOLING + ELECTRICAL PROTECTION
                 |
                 v
 BUILD AND COMMISSION
                 |
                 v
 MEASURE TRUE kW + kWh + TEMPERATURE
                 |
                 v
 PRODUCTION TRIAL + ACCEPTANCE TEST

Production Workflow: Forging vs. Melting

Coil and Fixture Design

Power-supply selection alone cannot determine coil turns, coil dimensions or compensating capacitance. These parameters form an electrically coupled resonant system and should be engineered together. Forging coils and melting-furnace coils must not be assumed interchangeable.

Cooling Circuit Heat-Balance Examples

For water around typical industrial temperatures: Q(kW) = 1.163 x Flow(m3/h) x Water Rise(C). These are calculated water-side loads and are not published HLQ cooling requirements.

Specify water conductivity, hardness, pressure, inlet temperature, strainers, flow switches and separate flow verification for critical branches. Low-water-flow events must initiate the designed electrical response; do not automatically stop necessary emergency cooling of a hot furnace.

Control System and Automation

The original page claims constant-capacity regulation, frequency-sweep starting and protection against overcurrent, undercurrent, overvoltage, undervoltage, water shortage and phase faults. It does not establish a specific PLC brand, communication protocol, power-factor performance or complete automatic line-control package.

Common Problems and Solutions

Engineering Selection Guide

1. Calculate Real Heating Power for Steel Billets

For continuous processing:

P_in(kW) = Throughput(kg/h) x Delta-h(kJ/kg) / [3600 x overall efficiency].

This example assumes 750kJ/kg to heat carbon steel from about 20°C to 1100°C and 65% overall electrical-to-workpiece efficiency.

Figure 4. Estimated Forging Power vs. Throughput

 CARBON STEEL 20 -> 1100 C; 750kJ/kg; assumed eta = 65%

 INPUT REAL POWER, WITHOUT 15% DESIGN ALLOWANCE

  500kg/h   |######                         | 160kW

  800kg/h   |##########                     | 256kW

 1000kg/h   |#############                  | 321kW

 1500kg/h   |###################            | 481kW

 2000kg/h   |##########################     | 641kW

 2500kg/h   |################################| 801kW

 CALCULATED EXAMPLES, NOT KGPS FACTORY PERFORMANCE DATA

2. Estimate Batch Melting Time

Electrical energy (kWh) = Melt weight (tonnes) x Specific electrical consumption (kWh/t).

Idealized energized time (hours) = Energy / Sustained measured real input kW.

The following uses 650kWh/t as an illustrative total electrical consumption for an example ferrous-melting duty. It is not a guarantee for any KGPS model.

The simple time calculation assumes that the quoted kWh/t and average power cover comparable operating boundaries. Real tap-to-tap time may include charging, chemistry adjustment, sampling, waiting and pouring. A furnace nameplate kW value must not be substituted for measured sustained real input without verification.

3. Validate Factory Line Power and Transformer Capacity

4. Commissioning and Factory Acceptance Test

Advantages

Limitations

Why Choose HLQ Induction Equipment?

HLQ supplies induction heating generators and related equipment for industrial metal processing. For a KGPS project, engineering value comes from pairing the correct electrical generator with a validated furnace or forging coil, reliable cooling, suitable site power, and measurable process acceptance criteria. Buyers should request current model drawings, verified electrical ratings, integration details, spare-parts information and a test protocol using their own workpiece or charge material.

For application-specific packages, explore HLQ’s
induction forging bar and billet furnaces,
copper induction melting furnaces
and
industrial induction melting furnace systems.

Information Required for a Technical Quotation

Core FAQs

FAQ 1. What is a KGPS induction generator power supply?

It is an SCR/thyristor-based medium-frequency power converter that drives a matched induction coil. It is commonly applied to industrial metal melting and solid-metal heating. The generator itself does not automatically include a complete furnace, refractory lining or material handling system.

FAQ 2. Which KGPS models and frequencies are published by HLQ?

The reviewed product page lists 11 models from KGPS-200 to KGPS-1500, with nominal power labels from 200 to 1500kW. Models KGPS-200/250/300 show 1–8kHz; KGPS-400 shows 1–4kHz; KGPS-500/600/750 show 0.5–2.5kHz; and KGPS-800/1000/1200/1500 show 0.5–1kHz.

FAQ 3. Does the published 1500kW model require technical clarification?

Yes. One original KGPS-1500 entry pairs 750V with 600A. In a balanced three-phase calculation, this is about 779kVA, so it cannot represent 1500kW real electrical input at that voltage and current. The manufacturer should issue a corrected and tested rating.

FAQ 4. How much power is required to heat 1000kg/h of carbon steel for forging?

With illustrative assumptions of 750kJ/kg enthalpy rise and 65% overall electrical-to-workpiece efficiency, estimated average real input is about 321kW. With 15% planning allowance, the preliminary requirement is about 369kW. This does not confirm that a particular coil or KGPS model meets the required core temperature.

FAQ 5. How should frequency be selected for a steel billet or melting furnace?

Frequency must be matched to workpiece or charge geometry, metal properties, resonant circuit, penetration and production cycle. Larger furnace charges often use lower frequencies, while smaller heating zones may require higher frequencies. Validate the final design through electrical and thermal trials.

FAQ 6. What is the difference between a KGPS SCR generator and an IGBT induction generator?

A KGPS generator uses thyristor/SCR conversion, while an IGBT generator uses insulated-gate bipolar transistor switching. The control architecture, typical switching frequencies, power matching and maintenance requirements differ. Selection should be based on a specific thermal load and verified system performance, not on semiconductor names alone.

FAQ 7. How should cooling equipment be sized?

Size cooling equipment from actual heat rejected into each cooling-water circuit, required flow, inlet temperature, pressure loss and water-quality specifications. For water, Q(kW) is approximately 1.163 times flow in m3/h times water temperature rise in degrees Celsius. The KGPS product page does not publish sufficient model-specific cooling data to calculate a guaranteed chiller size.

FAQ 8. What should be checked before purchasing a complete KGPS induction system?

Confirm the exact model, correct electrical input and kW definition, load frequency, site transformer, capacitor bank, matching coil or furnace, cooling equipment, protection interlocks, automation scope and installation requirements. Demand a written factory acceptance test based on measured input power, production output, process temperature and specific electrical consumption.

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