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The flyback switching power supply is mostly used in the low and medium power range, such as 2w~100w. Basic principle of flyback power supply When the power supply is in a steady state, at the time ton, the MOS transistor Q1 is turned on, and the inductor current of the prima
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The difference between the continuous mode CCM and the discontinuous mode DCM of the flyback switching power supply is mainly reflected in the transformer design. This article expands to explain which technical parameters of the flyback power supply will be affected by DCM. If you wan
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Combined with the schematic diagram, I try to explain the switching waveforms of the voltage and current at each key point of the flyback switching power supply in the steady state of the discontinuous mode DCM, without involving the specific component parameter values.Basic working principle of fly
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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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Type of output diodeSecondary winding output diode D1 usually chooses a Schottky diode or an ultra-fast recovery diode, one is because the reverse recovery time trr of these two diodes is short, and the other is because the forward voltage Vf drop of these two diodes is small.If the diode reverse re
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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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Low power consumption and low power 10W power supply chip U9513B With the advent of single-chip control switching power supply, switching power supply adapters have also surpassed power frequency transformer adapters with a strong momentum of development. This phenomenon is more obvio
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As an uninterruptible power supply, UPS has been widely used in various industries such as chemical industry, transportation, railway, power plant, substation, metallurgy, nuclear power plant, mobile communication, control equipment and its emergency protection system. It is used for computer and co
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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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