Part # Application Notes Motor Control Power Supply And Power Management Industrial Metering datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: Universal input voltage power supply for breaker and metering based on ESB


Part Details:

AN2454 Application note Universal input voltage power supply for ESBT based breaker and metering applications Introduction This document describes how to design a 3-phase power supply with the UC3845B PWM driver and the new STC04IE170 ESBT as main switch. It is associated with the release of the STEVAL-IPB001V1 demo board (see figure below). The design is a complete solution for the 2 W single output SMPS, which is widely used as a power supply in breaker applications. However, the design method can also be applied to an SMPS suitable for 3-phase power metering applications, as it can easily be upgraded for higher output power. In this report particular attention has been paid to the ESBT base driving circuit, where some useful methods have been investigated to better optimize power dissipation (see Section 6: Base driving circuit design). The influence of the parasitic capacitances of the transformer on the ESBT is also explained in detail (see Section 3: Parasitic capacitances and related issues). In addition, an active start-up circuit has been implemented on the demo board to optimize the converter efficiency, is also described (see Section 7: Active start-up circuit). A dedicated active component (the Darlington Q3) has been developed to support the very high voltage required (see Figure 1). Finally, the most important waveforms and thermal results are given in Section 8: Experimental results: waveforms and Section 9: Experimental results: efficiency and special considerations. They demonstrate the benefits of using this solution with the start-up circuit. Refer to AN1889 for the overall design of an auxiliary power supply using an ESBT. STEVAL-IPB001V1 demo board December 2006 Rev 1 1/24 www.st.com Contents AN2454 Contents 1 Design specifications and schematic diagram . . . . . . . . . . . . . . . . . . . 4 2 Flyback stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Parasitic capacitances and related issues . . . . . . . . . . . . . . . . . . . . . . . 8 4 Fine tuning of the application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 Transformer design characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Base driving circuit design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Active start-up circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Experimental results: waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 Experimental results: efficiency and special considerations . . . . . . 19 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2/24 AN2454 List of figures List of figures Figure 1. Schematic diagram of the SMPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Small signal equivalent circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 3. Current sense circuit (a) and waveform of sense resistor ( b) . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 4. The normal operation waveforms of output pulse and current spike . . . . . . . . . . . . . . . . . 10 Figure 5. ESBT driving circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11


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