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MAIDA DEVELOPMENT COMPANY

Maida Development Company is a family-owned business since 1947, specializing in high voltage components and over voltage protection. With expertise in designing and manufacturing capacitors, varistors, and metal oxide varistors, we offer customizable solutions to meet customer requirements. Our products are recognized by UL, CSA, and VDE.

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MAIDA DEVELOPMENT COMPANY

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  1. MAIDA DEVELOPMENT COMPANY

  2. INTRODUCTIONI • Family owned and operated since 1947, with continuous Administration, Sales, Engineering, Quality Assurance, and Manufacturing in Hampton, VA. • Founded as a supplier of tubular capacitors. Maida capacitor products now include a variety of components, with specific expertise in high voltage (6KV-45KV) designs. • Developed a metal oxide varistor product line in the late 1970s. Today Maida offers a full line of over voltage and over current protection components. • Maida components are recognized by UL, CSA, and VDE. l • y owned and operated since 1947. • high voltage disk capacitors (6KVDC - 30 KVDC).

  3. CORE COMPETENCIES • Ceramic Powder Formulations – capacitors and varistors • Customization – component configurations to meet customer requirements • Engineering • Ongoing research and development • Customer design assistance • State of the art test facilities • Understanding safety agency requirements • UL “CTDP” approved • UL “Standards Technical Panel” member • Sourcing, Stocking, and Supply Chain Solutions to meet customer delivery requirements

  4. Metal Oxide Varistor(MOV)

  5. Topics • What is an MOV? • How does it work? • Examples of Applications • Selecting MOVs • High Volume Market Examples

  6. Description • Varistors are voltage dependent non-linear devices with an electrical behavior similar to back to back zener diodes. • When exposed to a transient voltage, the varistor’s impedance changes from open circuit to conductive and diverts the current to ground.

  7. Electrical Behavior Varistor VI Characteristics

  8. Electrical Behavior The varistor also limits or “clamps” the voltage peak to a safe level for the equipment being protected. Voltage transient

  9. What are Transients and Risks? • Fast rising voltage surges, reaching their peak in µs. • Associated current surge up to 2-3ms in duration. • Risks are: • Semiconductor device destruction • Malfunction of logic circuits • Diminished dielectric strength of insulations • Impaired electromechanical contacts

  10. Causes of Transients • Lightning • Inductive Switching • Electrostatic Discharge • Electromagnetic Pulse

  11. TYPICAL Current Division of a 20KA Lightning Strike

  12. Where Is Transient Voltage Surge Suppression Needed? • Ground fault circuit interrupters • Power supplies • Communication equipment • Microprocessor protection • Motor control systems • Cable TV systems • Medical equipment • Street lighting • Automotive circuits • Traffic control facilities • Microwave devices • Computers • AC operated smoke detectors

  13. Construction Disc Material (ZnO + additives) Epoxy Coating (UL 94V-0) Lead wire (Tin plated copper) Electrode Area (screen-printed, fired-on silver ink)

  14. Construction • Thickness = Voltage rating • Diameter = Energy rating • Volume = Power rating

  15. Selecting the Varistor • Requires knowledge of the electrical environment. • Approximations usually are made. • Assessments may need to be made by a design engineer.

  16. Selecting the Varistor • Determine the steady-state working voltage of the circuit. • AC rating - maximum continuous sinusoidal voltage that may be applied, including any high line fluctuations. • DC rating - max. continuous DC voltage that may be applied - typically about 95% of the peak recurrent AC voltage. • Determine the Power rating needed for the component. • Determine the size needed for the application.

  17. Selecting-Define circuit capabilities • < 7 mm: -On PC board protections( <2A). • < 14mm: -AC power input of small size device( < 10A). • < 20mm: -AC power input of medium size device( < 25A). • > 32mm: -Circuit breaker at building entrances or input side of high current devices( >25A).

  18. Selecting-Load capabilities • Clamping voltage is the voltage that the MOV allows the protected system to “see”, also known as voltage passed. • Clamping voltage required depends upon the system protected. • Refer to V-I Curves.

  19. Selecting-Physical Size • Disk type devices are available from 5mm to 53mm • Square MOVs Available from 9mm to 34mm • Surface mount devices available

  20. Radial Leaded • Standard leaded disk • 5 mm to 25 mm • Used in a wide variety of applications • Most common • Custom lead forms available

  21. Market • Motor Controllers • Lighting Ballasts • UPS and Surge Strips • Switch-Mode Power Supplies • Industrial Control Protection • GFCI/AFCI/LCDI • LED Lighting

  22. Applications

  23. Applications

  24. Applications

  25. MAIDA Tab Leaded • Larger versions of the conventional MOV disk. Used primarily in outdoor service entrance equipment • 25 mm to 53 mm • Straight Tabs • Formed Tabs • Custom

  26. MAIDA Surface Mount Technology • Monolithic Chip 3220 • Multilayer packages 0402 to 1210 • Encapsulated MOV (eMOV) 2825 and 4032 packages

  27. Monolithic Chip 3220 • Voltage range: 10-300VAC/14-390 VDC • Up to 500 amps • Specifications: Close to 7mm

  28. Multilayer Varistors • Voltage range 3.3 to 48 VDC • Withstand up to 500 amps • Small size 0402 • Surface Mount Application

  29. Inner Electrode Pt - Ag/Pd Ceramic Layer ZnO End Terminations Ag/Pd, Ag/Pd/Pt (Ni/Sn Plating) Multilayer Varistor Construction

  30. Encapsulated MOV (eMOV) • 2825 and 4032 packages

  31. Types of Surface mount Applications • Hand-held Electronics • Digital Camera • Mobile Phone • PDA • Notebook • Personal Computers • USB, IEEE1394, IEEE1284 signal line • EMI Solution and ESD Protection for handset speaker port charger • Keyboards • Security System • Sensor protection • Key pads • Car Electronics • ABS System • Airbag System • Navigation System • Ignition circuit • Motor Control Boards • ECU Protection

  32. Introducing New Circuit Protection Components

  33. TPHE Thermally Protected High Energy MOVs

  34. TPHE • Maida has partnered with a manufacturer with a patented design. • Patent improves upon existing designs with a more reliable disconnect. (US8279575B2 Thermally Protected Surge Suppression Device) • Our FSS models have the form and fit that matches current applications.

  35. TPHE • Our FSD models are DIN Rail mount and are typically used in panel designs. • Our FSP models are a smaller design to compete in new applications. • Competitive pricing for existing applications. • 150 – 690 VAC • UL Approved (E321173)

  36. Applications • Residential/Commercial/Industrial Structures • Telecom • Distribution Systems • Transfer Switches • Utilities • Lighting • Power Supplies

  37. Ceramic Disk Capacitors

  38. Topics • What is a Capacitor? • Selecting Capacitors • Examples of Applications • High Volume Market Examples

  39. Description • Capacitors are two metal plates separated by a ceramic body. • Many different types of bodies are used to give a different temperature coefficient and capacitance. • Maida has Class I to Class III type Caps. • Also incorporate UW and UV types.

  40. Selecting The Capacitor • One would need the Operating Voltage. • The type body required with Q needed. • Size Restraints if any. • Lead Spacing.

  41. Applications and Markets • Filter Circuits • Power Supplies (Switch Mode) • Telecommunications • Automotive Applications • Transformer Circuits • General Circuits • TV Manufacturers • Bug Zappers

  42. MPD Series

  43. Description • The MPD Series is a modular surge protective device (SPD), featuring an IP65 enclosure rating, and is used for transient overvoltage protection. The MPD Series utilizes thermal protection in conjunction with metal oxide varistors to provide a protection package for use in many applications such as commercial and residential indoor/outdoor LED lighting fixtures. The MPD Series can be connected in series or parallel, is RoHS compliant, and has a LED operational indicator. The MPD Series is available with MCOV of: 120VAC, 277VAC, 347VAC, 480VAC..

  44. Applications • LED Street Lighting • Traffic Lighting • Park Lot Lighting • Uninterruptible Power Supplies (UPS) • Indoor/Outdoor LED Lighting Fixtures • AC Power Systems requiring thermal protection

  45. Key Features • UL1449 Type 4 Listed • Thermally Protected • One and two-port options • In: 5kA, 10kA • Imax: 10kA, 20kA (8x20us) • IP65 enclosure • LED status indicator

  46. How to Connect

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