Ultra-Reliable, High-Efficiency Cable Television Power Supply

Design Note #51

Ultra-Reliable, High-Efficiency Cable Television Power Supply

Cable television repeaters take a beating. Vibration, extremes of heat and cold, line voltage variation and lightning exact a heavy toll. Cost effective field deployment demands flawless electronics performance—year after year. OTEC’s ultra-reliable, high-efficiency cable television repeater power supply provides the foundation for high-reliability operation. At 80% efficiency, this 100,000 hour mean time between failure, 150-watt power supply provides a firm infrastructure upon which repeater amplifier electronics may build. Operational from 40 below zero to over 80 degrees C, this power supply simply won’t quit.

Unusual Input Waveform Requirements

Cable television repeaters are powered from old-style resonant transformer sources. Transmission line lengths vary, causing line input voltage variation from 35 to 90 Volts AC. Non-sinusoidal input wave shapes create additional demands on input conditioning circuitry. Low-voltage lockout, over current, over voltage, and lightning protection requirements make this supply unique in its class.

Ultra-Reliable, High-Efficiency Cable Television Power Supply

Linear Technology Power Supply Components

Working closely with Linear Technology Corporation, OTEC crafted a high-efficiency forward converter which boasts 80% operating efficiency. Planar magnetics reduce the overall package size. Unique heat sinking techniques maintain temperatures within acceptable ranges. Careful design validation resulted in a robust, manufacturable design that passes all agency approvals.

Orchid Technologies — Power Electronics

The development of custom Electronics Technology solutions for our OEM clients is OTEC’s entire business. High-performance Custom Power Supplies with rapid design cycles, demanding technical requirements and unforgiving schedules set us apart. Contact OTEC today!

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"When our old power supply vendors said NO, OTEC said YES. OTEC designed and delivered a high-reliability 100,000-hour 80% efficient power supply to us in under ten weeks. Simply fantastic."

- Cable TV Networks, Project Engineering

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