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When the MOS tube of the flyback switching power supply is turned off, the energy stored in the leakage inductance of the primary winding of the transformer cannot be transferred to the secondary winding, and the leakage inductance of the primary winding and the parasitic capacitance of the MOS tube
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1. Definition of switching power supplyAfter the input AC voltage (AC) is rectified and filtered, a high-voltage DC voltage (DC=1.4AC) can be obtained. This voltage is connected to the switching element and used as a switch in 20KHZ~100KHZ high frequency state. At this time, the DC high voltage will
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Simple working schematic diagram of the most basic flyback transformer switching power supply. In this circuit system, Ui is the input voltage of the switching power supply, T is the switching transformer, K is the control switch, C is the energy storage filter capacitor, and R is the load resist
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1. EMI regulations and test specifications Full electromagnetic compatibility means that the equipment or system meets the requirements in its electromagnetic environment and does not cause any equipment in its environment Capability of intolerable electromagnetic interference. Table
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1. Input voltageChina is generally 220V. Due to the instability of the grid voltage, a wide voltage input is often required, so it is designed to work normally at 90-270V. Usually the US electricity range is 110-130V, and Japan’s electricity range is 100V.2. The ripple of the output voltageSince th
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Ripple is mainly in five aspects: input low-frequency ripple, high-frequency ripple, common-mode ripple noise caused by parasitic parameters, ultra-high-frequency resonance noise generated during switching of power devices, and ripple caused by closed-loop regulation control. wave noise. 1. Low f
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