A switching power supply control circuit and control method thereof
A technology of switching power supply and control circuit, which is applied in the direction of control/regulation system, electrical components, regulating electrical variables, etc., can solve the problem of inability to accurately feedback the output voltage Vo, etc.
Active Publication Date: 2022-07-26
CHENGDU MONOLITHIC POWER SYST
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Therefore, the feedback voltage Vzcd cannot accurately feedback the output voltage Vo
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[0017] Specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only used for illustration and are not used to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.
[0018] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention in at least one embodiment. Thus, appearances of the ...
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A control circuit of a switching power supply and a control method thereof are disclosed. The control circuit of the present invention detects the voltage at the inflection point of the auxiliary winding feedback voltage from high to low when the switching power supply operates in the discontinuous current mode, and subtracts the feedback voltage of the auxiliary winding detected when the switching power supply operates in the discontinuous current mode. Inflection point voltage, so as to obtain the forward conduction voltage drop of the secondary side rectifier of the switching power supply, and when the switching power supply works in the continuous current mode, the obtained forward conduction voltage drop of the secondary side rectifier can be used to eliminate the sample and hold voltage of the auxiliary winding in the continuous current mode. error in the forward voltage drop of the secondary rectifier for accurate output voltage feedback. The switching power supply of the invention can accurately obtain the feedback information of the output voltage under various current modes, so as to control the operation of the switching power supply more accurately.
Description
technical field [0001] Embodiments of the present invention relate to an electronic circuit, and more particularly, to a voltage detection circuit of an isolated switching power supply circuit and a control method thereof. Background technique [0002] Isolated switching power supply circuits have isolated primary and secondary circuits such as figure 1 The typical isolated switching power supply circuit shown, ie, the Flyback circuit 10, includes a transformer T1, and primary and secondary side circuits isolated by the transformer T1. like figure 1 As shown, the transformer T1 has a primary winding Lp and a secondary winding Ls, the primary winding Lp receives the input voltage Vi and is coupled to the control switch PM1, and the secondary winding Ls provides the output voltage Vo. The so-called primary side of the Flyback circuit 10 refers to the primary winding Lp of the transformer T1 and other devices and circuits coupled thereto, while the so-called secondary side of...
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IPC IPC(8): H02M3/335
CPCH02M3/33507H02M3/33523Y02B70/10H02M1/0006H02M1/0058H02M1/0025H02M1/0064
Inventor 李晖王斯然
Owner CHENGDU MONOLITHIC POWER SYST