Switching power supply circuit

Abstract

The invention discloses a switching power supply circuit. A power supply control module and an energy transfer module are included; the power supply control module is used for converting electric energy of preset frequency; the primary side of the energy transfer module is connected with the input end of the power supply control module, and the secondary side of the energy transfer module is connected with the output end of the power supply control module; when the power supply control module is switched on, the primary side is connected with the secondary side in series; a current passes through the primary side and the secondary side at the same time for performing energy charging synchronously; when the power supply control module is switched off, the energy stored by the primary sideis transferred to the secondary side through an iron core; meanwhile, the electric energy obtained by the secondary side when the switching power supply is switched on is output to the output end of the switching power supply; in output, the primary side also outputs energy, so that the output power can be improved in a relatively high degree; in addition, the primary side is connected with the secondary side in series through the power supply control module, so that the primary side and the secondary side can share one reference potential, thereby enabling the switching power supply circuit to be applied to circuits, such as a silicon controlled rectifier and the like which need the primary side and the secondary side to be grounded commonly.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a switching power supply circuit. Background technique [0002] Switching power supply is a kind of power supply that uses modern power electronics technology to control the time ratio of switching on and off to maintain a stable output voltage. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating. Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, electrical equipment, instrumentation, medical equipment, refrigeration and heating (refrigerator air conditioners, etc.), air purifiers, liquid crystal displays, LED lighting, communication equipment, audio-visual products, security monitoring, LED light strips, computer cases, digital products and in...

AI Technical Summary

Problems solved by technology

[0003] Among them, the flyback switching power supply is very popular because of its simple circuit structure and low cost. The existing flyback switching power supply usually includes isolated switching power supply and non-isolated switching power supply. However, in the technical solution of isolated switching power supply In the middle, due to the existence of the transformer, the primary side is isolated from the secondary side, and this circuit cannot be applied to circuits such as silicon controlled rectifiers that require primary and secondary common grounding.

The non-isolated switching power supply circuit is limited by the I-shaped inductance, which cannot provide large power and is difficult to adapt to a wider range of applications.

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