9W, electric furnace control power supply design that can withstand high ambient temperature

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Summary:

working principle

High operating ambient temperatures require higher efficiency of the power supply to reduce its own heat. TinySwitch-III devices are ideal for this type of application because they provide a high efficiency, low cost solution.

The flyback power supply as shown can operate from an input voltage range of 165 - 265 VAC. It is capable of delivering 9 V, 1 A output current, making it ideal for applications such as electric furnace control at high ambient temperatures.

The AC input voltage is rectified by D1-D4 and filtered by C1 and C2. Fuse F1 is protected in the event of a serious fault. Inductors L1, L3 and capacitors C1, C2 and C9 provide differential mode filtering. Y capacitor C4 provides common mode filtering.

design feature

• High working temperature (TAMB = 105 °C)
• Extremely energy efficient
• Meets CEC 2008 requirements for efficiency in the load mode (requires 68.8%, up to
• Up to 82%)
• No-load input power < 150 mW at 265 VAC input
• Enhanced protection
• Hysteresis thermal shutdown protection
• Automatic restart function provides output short circuit protection
• Meets EN55022B conducted EMI limits, EMI margin >8 dBμV

See the PDF document for details (click on the PDF file to download)