Synchronous rectification switching power supply and its control method

A technology of synchronous rectification switch and synchronous switch, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., can solve the problem of high proportion of switching power supply, reduce output voltage, solve efficiency and power consumption, and reduce power consumption. consumption effect

Active Publication Date: 2019-04-09
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the secondary side control circuit itself will also generate power consumption, especially under light load conditions, the secondary side control circuit still works, and the proportion of the power consumption of the entire switching power supply is too high

Method used

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  • Synchronous rectification switching power supply and its control method
  • Synchronous rectification switching power supply and its control method
  • Synchronous rectification switching power supply and its control method

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Embodiment Construction

[0032] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown.

[0033]In the following, many specific details of the present invention are described, such as device structures, materials, dimensions, processing techniques and techniques, for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.

[0034] The invention can be embodied in various forms, some examples of which are described below.

[0035] figure 1 A schematic circuit diagram showing a synchronous rectification switching power supply. The switching power supply 100 includes a transformer T1, a main switching tube M1 lo...

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PUM

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Abstract

The application discloses a synchronous rectification switching power supply and a control method thereof. The synchronous rectification switching power supply includes: a transformer including a primary winding and a secondary winding; a main switching tube connected in series with the primary winding and periodically turned on and off so that the primary winding The secondary winding transmits energy; the synchronous switching tube is connected in series with the secondary winding, and is turned on and off in the same cycle as the main switching tube; the output capacitor, the first end of the output capacitor is connected to The second end of the secondary winding is connected to the synchronous switching tube, wherein the primary winding of the transformer receives an input voltage, and the secondary winding of the transformer charges the output capacitor, so that the output capacitor The output voltage is generated on the upper side, and the main current path of the synchronous switching tube is disconnected under light load or no load, and the conduction state of the synchronous switching tube is maintained by means of a parasitic diode. The synchronous rectification switching power supply can reduce the power consumption at light load.

Description

technical field [0001] The present invention relates to switching power supply technology, more specifically, to a synchronous rectification switching power supply and a control method. Background technique [0002] The switching power supply controlled by the primary side can use the auxiliary winding of the transformer to obtain the feedback signal related to the output voltage, so it can save the electronic components such as optocoupler and precision voltage source used to feed the feedback signal from the secondary side to the primary side, and simplify the signal feedback path. The switching power supply controlled by the primary side is easy to form a modular and miniaturized integrated circuit, and has been widely used in various charging power supplies for mobile phones, tablet computers and portable media players, as well as in power supplies for driving light-emitting diodes (LEDs) . [0003] In the switching power supply controlled by the primary side, the prim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/0032H02M1/0048Y02B70/10
Inventor 洪益文詹桦张钦阳
Owner HANGZHOU SILAN MICROELECTRONICS
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