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
CN106208714AActive Publication Date: 2016-12-07HANGZHOU SILAN MICROELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU SILAN MICROELECTRONICS
Publication Date
2016-12-07

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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.
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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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