BUCK transformation circuit

Abstract

The invention provides a BUCK transformation circuit, and belongs to the field of switch power supplies. The BUCK circuit comprises a first BUCK unit, a second BUCK unit, a feedback unit and a processor, the first BUCK unit comprises a first controllable switch, a first diode and a first inductor, a first end of the first inductor is connected with a positive electrode of a power supply through the first controllable switch, a second end of the first inductor is connected with an output end, a negative electrode of the first diode is connected with the first end of the first inductor, a positive electrode first diode is connected with a negative electrode of the power supply, the second BUCK unit comprises a second controllable switch, a second diode and a second inductor, a first end of the second inductor is connected with the positive electrode of the power supply through the second controllable switch, a second end of the second inductor is connected with the output end, a negativeelectrode of the second diode is connected with the first end of the second inductor, a positive electrode second diode is connected with the negative electrode of the power supply, the feedback unitis used for acquiring voltage signals of the output end and feeding back corresponding feedback signals according to the voltage signals, and the processor is used for generating first PWM (pulse-width modulation) signals and second PWM signals.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a step-down conversion BUCK circuit. Background technique [0002] Switching power supply is indispensable in modern people's life, and the use of switching power supply can be seen in new energy vehicles, aerospace, and military fields. With the further development of switching power supply technology, new requirements have been put forward for the power density, volume, performance, reliability and cost of power supply products. The country and major organizations have successively promulgated a series of regulations to restrict the switching power supply market, such as power supply products Must pass EMI test and safety specification certification, etc. [0003] As we all know, the BUCK topology is simple and can be widely used in switching power supplies, especially in medium and low-power power supply systems. Although the single-channel BUCK circuit has many advant...

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Problems solved by technology

[0003] As we all know, the BUCK topology is simple and can be widely used in switching power supplies, especially in medium and low-power power supply systems. Although the single-channel BUCK circuit has many advantages, it cannot be applied to high-power circuit systems due to its limited application range. middle

With the increase of power, a series of problems such as increased switch stress, poor output stability, increased EMI, and increased current ripple in the single-channel BUCK power supply appear, making people have to choose other more complex structures.

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