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Synchronous rectification switching power supply and control method

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

Active Publication Date: 2016-12-07
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

The invention discloses a synchronous rectification switching power supply and a control method thereof. The synchronous rectification switching power supply comprises a transformer, a main switching tube, a synchronous switching tube and an output capacitor, wherein the transformer comprises a primary winding and a secondary winding; the main switching tube is connected with the primary winding in series, and switches on and off periodically, so that the primary winding transmits energy to the secondary winding; the synchronous switching tube is connected with the secondary winding in series, and switches on and off according to a same period with the main switching tube; a first end of the output capacitor is connected with the secondary winding, and a second end of the same is connected with the synchronous switching tube; the primary winding of the transformer is connected with an input voltage, the secondary winding of the transformer powers the output capacitor, so that an output voltage is generated on the output capacitor, when in light or idle run, a main current path of the synchronous switching tube is switched off, and a switch-on state of the synchronous switching tube is maintained depending on a parasitic diode. According to the synchronous rectification switching power supply, power consumption in light run can be reduced.

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 Applications(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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