Switching power supply control system
A technology of control system and switching power supply, applied in control/regulation systems, electrical components, regulating electrical variables, etc., can solve the problems of high cost, low working reliability, and large occupied area.
Active Publication Date: 2018-09-07
ON BRIGHT ELECTRONICS SHANGHAI
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Problems solved by technology
[0005] However, in the above-mentioned switching power supply control circuit provided by the prior art, since the voltage dividing resistor R1 and the voltage dividing resistor R2 need to be used to provide detection signals for the feedback pin FB of the switching power supply control chip U0, and the auxiliary power supply of the transformer T1 is needed The winding supplies power to the switching power supply control chip U0 through the diode D6 and the resistor R3, so that the switching power supply driving chip U0 has more peripheral circuit devices, higher cost, larger occupied area, and lower working reliability
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[0014] Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed 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 skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configurations and algorithms presented below, but covers any modification, substitution and improvement of elements, components and algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
[0015]...
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The invention relates to a switching power supply control system, and provides a switching power supply control system. The switching power supply control system comprises a filtering and rectifying circuit, a control circuit and an output circuit, wherein an input end of the filtering and rectifying circuit is connected with alternating current power supply, and an output end of the filtering andrectifying circuit is connected with the control circuit; and an input end of the control circuit is connected with the output end of the filtering and rectifying circuit, and an output end of the control circuit is connected with the output circuit. In addition, the control circuit comprises a feedback voltage-dividing resistor, a sampling and holding assembly and a switch driving assembly, wherein the sampling and holding assembly is configured to obtain the sampling voltage through a voltage-dividing signal of the feedback voltage-dividing resistor and obtain the demagnetization time at least partially based on the voltage-dividing signal, and the switch driving assembly is configured to generate a driving signal at least partially based on the demagnetization time so as to drive a power switch.
Description
technical field [0001] Certain embodiments of the invention relate to integrated circuits. More specifically, some embodiments of the present invention provide a switching power supply control chip and a switching power supply control system. Background technique [0002] In recent years, switching power supply technology has been developing continuously and has broad application prospects. figure 1 Shown is a typical structure of the primary side feedback flyback switching power supply control system, in which diodes D1, D2, D3 and D4 form a rectifier bridge, and the rectifier bridge and capacitor Cbulk together form an input circuit for converting AC After the input voltage VAC is rectified and filtered, it is output to the primary winding of the transformer T1. Wherein, the diode D5, the capacitor Cout and the resistor Rout form an output circuit, which is used to rectify and filter the voltage output by the secondary winding of the transformer T1, and then output it to...
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IPC IPC(8): H02M7/217H02M3/335
CPCH02M3/33569H02M7/217
Inventor 黄剑锋林武平赵春胜张允超
Owner ON BRIGHT ELECTRONICS SHANGHAI