Ridley Engineering

What Ridley Engineering does

Ridley Engineering, Inc. is a private, founder-led power electronics engineering firm founded in April 1991 by Dr. Ray Ridley and headquartered in Camarillo, California, with a European training presence in Cambridge, UK. The company serves switching power supply design engineers through an integrated ecosystem that combines proprietary design software (RidleyWorks Power 4-5-6, including a cycle-by-cycle simulator covering three major converter families in CCM and DCM), specialized test hardware (the AP310 Frequency Response Analyzer and the integrated RidleyBox design-and-test system), hands-on 5-day laboratory workshops delivered globally, technical publications (the Power Supply Design book series), and the Design Center community platform with 20,000+ registered members.

Underlying technology rests on Dr. Ridley's proprietary continuous-time current-mode control model (the first to predict current-loop instability and transition modes accurately to half the switching frequency), the Ridley-Nace magnetics core loss equations, and the PWM switch model. Granted US and Swiss patents cover multi-loop control for quasi-resonant converters and wide-range power factor correction circuits. Integrations link RidleyWorks to PSIM and LTspice simulation environments for combined design and SPICE-based analysis workflows.

Revenue is generated across five streams: software licensing (RidleyWorks annual subscriptions), hardware sales (AP310, RidleyBox, accessories), professional services (workshops and consulting), one-time book sales, and webinar/video content distribution. Distribution is via the company's direct e-commerce storefront (shop.ridleyengineering.com) for SMB and individual buyers, with quote-based pricing for enterprise hardware and software. Customer segments span commercial and military power supply designers, server/data center power systems, electric vehicle power electronics, and engineers seeking continuing professional education. The company has remained privately held with no external institutional investment.

Name

Ridley Engineering

Legal name

Ridley Engineering, Inc.

Website

https://ridleyengineering.com

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

11–50 employees

Short description

Ridley Engineering provides proprietary power supply design software (RidleyWorks), specialized frequency-response test hardware, and hands-on engineering workshops, serving commercial, military, server, and EV power electronics design engineers globally.

Ownership category

akta.pro rank

Product category

Power Electronics Design Tools

NAICS

Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Other Measuring and Controlling Device Manufacturing (334519), Switchgear and Switchboard Apparatus Manufacturing (335313), Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Electronic & Other Electrical Equipment (No Computer Equip) (3600), Electrical Industrial Apparatus (3620), Switchgear & Switchboard Apparatus (3613)

akta.pro primary industry

Industrial Control Cabinets & Power Distribution (Panels, Switchgear for Automation) (IMAHAHAK)

akta.pro secondary industries

Low-Voltage Switchboards & Panelboards (LV distribution panels, MCCs, switchboards) (IMAGAEAA), Testing, Commissioning & Electrical Safety (NFPA 70E/Arc Flash) (EDAOABAM)

Keywords

• Switching power supply design
• Frequency response analysis
• Current-mode control modeling
• Power electronics design tools
• Magnetics design engineering

Headquarters

HQ city

Camarillo

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Others

Revenue model

1. Software Licensing (RidleyWorks): RidleyWorks design software sold with license-based pricing. Includes Power 4-5-6 design software with all equations for major converter families. Customers can download free Control Analysis Software and LTspice models.
2. Educational Workshops: 5-day hands-on power supply design workshops and 1-day workshops offered in multiple global locations (Camarillo CA, Cambridge UK, San Antonio TX). Includes hands-on laboratory experience with professional equipment.
3. Hardware Products: Sale of AP310 Frequency Response Analyzer and RidleyBox test and measurement system with accessories including injection isolators and measurement probes.
4. Books and Publications: Sale of 'Power Supply Design, Vol 1: Control' - a 170-page book covering PWM converter control, modeling, and compensation. Additional books on Current-Mode Control available.
5. Webinar Content and Video Materials: Educational webinar content covering topics like frequency response measurement, magnetics design, control loop design, and LLC converter design.
6. Consulting Services: Expert consulting services available when customers need help during the design process.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

Ridley Engineering designs and sells switching power supply design tools, test instrumentation, and training resources for power electronics engineers. The core product is RidleyWorks modeling and simulation software, complemented by hardware test equipment (the AP310 Frequency Response Analyzer and the RidleyBox integrated talking design and test system), hands-on laboratory workshops, and technical publications. The company additionally provides consulting services to help customers debug and complete their switching power supply designs.

Product overview

Ridley Engineering provides a comprehensive suite of products and services for switching power supply design. The core offerings include RidleyWorks software for design and simulation, the AP310 Frequency Response Analyzer and RidleyBox hardware for testing and measurement, complemented by educational workshops and technical publications including the Power Supply Design book series. The company also offers the Ridley Universal Injection Isolator as an accessory for their analyzers. All products are tied together through the Design Center, an online knowledge resource providing articles, videos, and technical documentation for power electronics engineers.

Differentiator

Problem solved

Functional benefit

Brands

• RidleyWorks: Industry-leading software program for designing switching power supplies in both commercial and military applications.
• RidleyBox
• AP310 Analyzer
• Power Design Workshop
• Design Center

Products and services

• RidleyWorks Power 4-5-6 Software Industry-leading software for designing switching power supplies in commercial and military applications, containing all equations for three major families of converters operating in CCM and DCM under voltage-mode or current-mode control, with a unique cycle-by-cycle simulator for fast large-signal simulation.
• AP310 Frequency Response Analyzer Full-featured frequency response analyzer used to measure loop gain, phase margin, and other control-loop characteristics of switching power supplies, sold with in-house developed accessories.
• RidleyBox Test and Measurement System The world's first talking design and test system with an integrated frequency response analyzer, oscilloscope, and on-board computer for comprehensive power supply loop measurement and testing.
• Ridley Universal Injection Isolator Wideband injection isolator accessory for the AP310 analyzer, designed to provide accurate loop gain and control loop testing across the full range of frequency response measurements.
• Power Design Workshop 5-day and 1-day hands-on laboratory workshops teaching switching power supply design using professional equipment, taught by Dr. Ray Ridley and held globally across the company's Camarillo CA, Cambridge UK, and San Antonio TX sites.
• Power Supply Design, Vol 1: Control 170-page technical book covering control of PWM converters, including nine topologies, voltage-mode and current-mode control modeling, and frequency response measurements, aimed at working power supply design engineers.
• Expert Consulting Services Expert consulting services offered by Ridley Engineering to assist customers during the switching power supply design process, provided on an as-needed basis through direct engagement.

Quantifiable outcome

• Workshop attendees report deep understanding and real-world experience after taking the course
• +2 more outcomes

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Feature7 records

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Tektronix: Tektronix provides oscilloscopes, spectrum analyzers, and test equipment used in power supply design verification, competing at the edges of Ridley's hardware measurement offerings with a much broader catalog.
• ANSYS: ANSYS provides electromagnetic and multiphysics simulation (Maxwell, Simplorer) that overlaps with RidleyWorks' magnetics and converter simulation use cases, though as part of a much larger CAE portfolio.
• Cadence Design Systems: Cadence's PSpice and PCB/EDA tools are widely used by the same power supply design engineers and serve as a default simulation environment, competing with RidleyWorks at the general-purpose level.
• Keysight Technologies: Keysight offers broad electronic test and measurement instruments, including oscilloscopes and frequency response tools that overlap with RidleyBox and AP310 capabilities, though not specialized to power supply control loops.

Direct peers

• MathWorks (MATLAB/Simulink): Simulink with Simscape Electrical is the dominant system-level simulation environment used by power electronics control designers, overlapping directly with RidleyWorks' target users and use cases.
• Plexim (PLECS): Plexim's PLECS is a circuit simulator specifically built for power electronics, directly competing with RidleyWorks for the same design engineer audience and offering system-level simulation of converters.
• Powersim (PSIM): PSIM is a power electronics simulation package widely used by the same switching power supply engineers Ridley targets; RidleyWorks explicitly integrates with PSIM, underscoring direct overlap.
• Omicron Lab: Omicron Lab manufactures frequency response analyzers (e.g., Bode 100) targeted at power electronics and control loop measurement, directly competing with the AP310 and RidleyBox in the same loop-gain testing use case.
• AP Instruments: AP Instruments manufactures the AP310 Frequency Response Analyzer that Ridley Engineering resells, and also sells competing frequency response analyzers and related test equipment to the same power supply design engineer audience.

Others

• Bodo's Power Systems: Bodo's Power Systems is a leading trade publication and event organizer serving the same power electronics engineering audience, competing indirectly with Ridley's Design Center content and workshop ecosystem as a channel for engineer attention.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

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Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Ridley Engineering