Power Semiconductor Assembly for Static Bypass Switches

Product Specifications

Technical details and manufacturing context for Power Semiconductor Assembly

Definition

The Power Semiconductor Assembly is a critical component within a Static Bypass Switch (SBS) used in Uninterruptible Power Supplies (UPS). Its primary function is to provide a near-instantaneous, solid-state electrical path that bypasses the UPS inverter during maintenance, overload, or inverter failure. This ensures continuous power to the critical load by utilizing fast-switching power semiconductor devices to manage the transfer between the inverter output and the raw utility bypass source.

The assembly typically includes power semiconductor devices such as IGBTs, MOSFETs, or thyristors, along with associated circuitry, mounted on a substrate like Direct Bonded Copper (DBC) or Insulated Metal Substrate (IMS). It features aluminum or copper busbars for high-current connections, thermal interface materials for heat dissipation, and a ceramic or plastic housing with encapsulation for protection. The assembly is designed to operate within specified electrical and environmental parameters, including rated voltage (400–690 V AC), rated current (100–2000 A), switching frequency (2–20 kHz), junction temperature range (-40 to 150 °C), isolation voltage (2500–6000 V AC), thermal resistance (0.05–0.5 K/W), operating temperature range (-40 to 70 °C), humidity range (5–95% RH), ingress protection rating (IP20–IP54), and dimensions (100×60×30 to 400×200×150 mm). These values are reference ranges and must be verified for the specific model and application.

The assembly operates based on control signals from the UPS logic controller. Upon command, such as detection of an inverter fault, it activates its power semiconductor switches, which turn on rapidly to create a low-impedance path for AC mains power to flow directly to the output, bypassing the rectifier, battery, and inverter sections. It manages synchronization with the bypass source in terms of phase, voltage, and frequency before closing the circuit to prevent transients, and ensures a break-before-make or make-before-break transition as per the system design.

For procurement and verification, it is essential to confirm model-specific values and standards with the legal manufacturer or supplier. The listed standards (e.g., IEC 60038, IEC 60947-1, IEC 60747) serve as references for verification, not as proof of compliance.

Working Principle

The assembly receives a control signal from the UPS logic controller. Upon command (e.g., inverter fault detected), it activates its power semiconductor switches (typically IGBTs or SCRs). These devices turn on rapidly, creating a low-impedance path for the AC mains power to flow directly to the output, bypassing the rectifier, battery, and inverter sections. It manages synchronization (phase, voltage, frequency) with the bypass source before closing the circuit to prevent transients and ensures a break-before-make or make-before-break transition as per the system design.

Common Materials

Silicon (Si) or Silicon Carbide (SiC) Semiconductor Die, Direct Bonded Copper (DBC) or Insulated Metal Substrate (IMS), Aluminum or Copper Busbars/Connectors, Thermal Interface Material (Grease/Pad), Ceramic or Plastic Housing, Solder, Encapsulant/ Potting Compound

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	400–690 V AC	System voltage range for static bypass switchIEC 60038
Rated Current	100–2000 A	Continuous current rating per phaseIEC 60947-1
Switching Frequency	2–20 kHz	Typical for IGBT modules
Junction Temperature Range	-40–150 °C	Operating junction temperature limitsIEC 60747
Isolation Voltage	2500–6000 V AC	Dielectric withstand between terminals and baseplateIEC 60747
Thermal Resistance (Junction-to-Case)	0.05–0.5 K/W	Lower is better for heat dissipationIEC 60747
Operating Temperature Range	-40–70 °C	Ambient temperature for reliable operationIEC 60068-2-1/2
Humidity Range	5–95 % RH	Non-condensingIEC 60068-2-78
Ingress Protection Rating	IP20–IP54	Depends on enclosure designIEC 60529
Baseplate Material	Cu–AlSiC	Copper for thermal performance, AlSiC for CTE matching
Weight	0.5–15 kg	Depends on current rating and cooling
Dimensions (L×W×H)	100×60×30–400×200×150 mm	Envelope dimensions for integration

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

Power Semiconductor Devices (IGBTs/SCRs)
Perform the actual high-speed switching of the electrical current.

Material: Silicon/Silicon Carbide, Copper
Gate Driver Board
Provides the precise, isolated voltage/current signals required to turn the semiconductor switches on and off reliably.

Material: FR4 PCB, Electronic Components
Heat Sink Part
Dissipates heat generated by the semiconductor devices during conduction and switching to maintain safe operating temperatures.

Material: Aluminum Alloy
Current Sensors
Monitor the load current flowing through the assembly for protection and control feedback.

Material: Ferrite Core, Copper Windings
Snubber Circuit
Suppresses voltage spikes and ringing during switching transitions to protect the semiconductors.

Material: Capacitors, Resistors

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Power Semiconductor Assembly.

Applied To / Applications

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

Static Bypass Switch

View system integration details

Manufacturers of Power Semiconductor Assembly

Manufacturer profiles associated with Power Semiconductor Assembly.

Sourcing Power Semiconductor Assembly from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the primary function of a power semiconductor assembly in a static bypass switch?

It provides a near-instantaneous solid-state path to bypass the UPS inverter during maintenance, overload, or failure, ensuring continuous power to the critical load.

Which semiconductor devices are typically used in this assembly?

Typical devices include IGBTs, MOSFETs, or thyristors, depending on the application requirements.

What are the key electrical parameters to consider?

Key parameters include rated voltage (400–690 V AC), rated current (100–2000 A), switching frequency (2–20 kHz), isolation voltage (2500–6000 V AC), and thermal resistance (0.05–0.5 K/W). These are reference ranges and must be verified for the specific model.

How should I verify compliance with standards?

Always confirm model-specific values and standards with the legal manufacturer or supplier. Listed standards like IEC 60038, IEC 60947-1, and IEC 60747 are references for verification, not proof of compliance.

Data Basis

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

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Power Semiconductor Assembly

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Atmospheric (sealed assembly, not pressure-rated)
other spec:	Max current: 100-5000A (application-dependent), Max voltage: 600-6500V (application-dependent), Switching frequency: up to 50kHz
temperature:	-40°C to +125°C (operating), -55°C to +150°C (storage)

Power Semiconductor Assembly

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards