Plasma Power Supply for CNC Plasma Cutting

Product Specifications

Technical details and manufacturing context for Plasma Power Supply

Definition

The plasma power supply is a critical component of a heavy-duty CNC plasma cutting machine. It converts incoming AC line power into a precisely controlled DC output, providing the high voltage needed to initiate the plasma arc and the constant current required to maintain a stable, high-temperature cutting arc through conductive materials. This enables the machine's core cutting function. Typically using an inverter design for efficiency and control, the power supply rectifies incoming AC power to DC, then uses high-frequency switching to step up the voltage. A pilot arc circuit generates a high-frequency, high-voltage spark to ionize gas and create a conductive path. Once established, the main circuit supplies a constant DC current, maintaining the plasma arc. Advanced units feature feedback systems to regulate output based on torch height, material, and cut quality. Key parameters include rated output power (5–120 kW), output current (20–100 A), output voltage (100–160 V DC), input voltage (380–415 V AC, three-phase, 50/60 Hz, per IEC 60038), duty cycle (60–100% at rated current, 40°C ambient, per EN 60974-1), cutting thickness (1–50 mm for mild steel), operating temperature (-10 to 40°C), storage temperature (-20 to 60°C), relative humidity (≤90%, non-condensing), ingress protection (IP21–IP23 per IEC 60529), weight (20–80 kg), and dimensions (500×400×300 to 800×600×500 mm). Materials include copper windings and busbars, aluminum heat sinks and casing, silicon steel transformer cores, and electronic components such as IGBTs, capacitors, and PCBs. Verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The power supply uses an inverter design. It rectifies incoming AC power to DC, then uses high-frequency switching to step up the voltage. A pilot arc circuit generates a high-frequency, high-voltage spark to ionize gas and create a conductive path. Once established, the main circuit supplies a constant DC current, maintaining the plasma arc. Advanced units feature feedback systems to regulate output based on torch height, material, and cut quality.

Common Materials

Copper (windings, busbars), Aluminum (heat sinks, casing), Silicon Steel (transformer cores), Electronic Components (IGBTs, capacitors, PCBs)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Output Power	5–120 kW	Determines cutting thickness and speed.
Output Current	20–100 A	Higher current for thicker material.
Output Voltage	100–160 V DC	Arc voltage depends on torch and material.
Input Voltage	380–415 V AC	Three-phase, 50/60 Hz.IEC 60038
Duty Cycle	60–100 %	At rated current, 40°C ambient.EN 60974-1
Cutting Thickness	1–50 mm	Mild steel, depending on current.
Operating Temperature	-10–40 °C	Below -10°C may affect electronics.
Storage Temperature	-20–60 °C	Avoid extreme heat or cold.
Relative Humidity	≤90 %	Non-condensing.
Ingress Protection	IP21–IP23	Higher IP for dusty environments.IEC 60529
Weight	20–80 kg	Depends on power rating and enclosure.
Dimensions (W×D×H)	500×400×300–800×600×500 mm	Footprint for installation.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Main Transformer / Inverter
Steps up voltage and converts AC to controlled high-frequency AC/DC for the arc.

Material: Silicon Steel, Copper, Insulation Materials
Rectifier & Filter Circuit Part
Converts incoming AC to smooth DC for the inverter stage.

Material: Diodes, Capacitors, PCBs
IGBT Module
High-speed switching transistors that create the high-frequency AC in inverter designs.

Material: Semiconductor (Silicon), Copper
Control Board
Microprocessor-based board that regulates output, manages sequencing, and interfaces with the CNC.

Material: PCB, Electronic Components (ICs, resistors)
Heat Sink & Cooling System
Dissipates heat generated by electronic components to maintain safe operating temperatures.

Material: Aluminum, Fans
Pilot Arc Circuit
Fires the high-frequency spark that first ionises the gas so the main arc can strike.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Heavy-Duty CNC Plasma Cutting Machine

View system integration details

Manufacturers of Plasma Power Supply

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

TechPro

Jinan, Shandong, CN

Also makes: Fiber Laser Cutting Machine, Furniture Assembly Line, Laser Welding Machine and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the typical input voltage for a plasma power supply?

The input voltage is typically three-phase, 380–415 V AC, 50/60 Hz, per IEC 60038. Verify the exact requirement for your model.

What cutting thickness can this power supply handle?

For mild steel, the cutting thickness ranges from 1 to 50 mm, depending on the output current. Confirm with the manufacturer for your specific application.

What is the duty cycle and what does it mean?

The duty cycle is 60–100% at rated current and 40°C ambient, per EN 60974-1. It indicates the percentage of time the power supply can operate at rated load without overheating.

What ingress protection rating is available?

The ingress protection rating is IP21–IP23 per IEC 60529. Higher ratings are suitable for dustier environments. Verify the specific rating for your model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric operation only, not rated for pressurized environments
other spec:	Input voltage: 200-480V AC ±10%, 50/60Hz; Output power: 5-200kW typical; Duty cycle: 100% continuous at rated output
temperature:	0-40°C ambient operating range, internal components rated for 85°C max

Plasma Power Supply

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards