Switching power supply system and lineal pressure compensation device for switching power supply
A compensation device and switching power supply technology, applied in output power conversion devices, control/regulation systems, electrical components, etc., can solve the problems of unsatisfactory output voltage load regulation of switching power supply, and achieve perfect output load regulation, Simple control method, stable and reliable circuit
Active Publication Date: 2013-12-25
BYD SEMICON CO LTD
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Problems solved by technology
However, what the control chip IC actually samples is the voltage drop before the output line, so the voltage at the load end will vary with the load, resulting in an unsatisfactory load regulation rate of the output voltage of the switching power supply.
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[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0021] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicat...
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The invention puts forward a lineal pressure compensation device for a switching power supply. The lineal pressure compensation device comprises a voltage sampling module used for sampling a feedback signal of voltage output of the switching power supply, an error amplification module used for acquiring an error-amplified voltage feedback signal, a demagnetization time sapling module used for sampling demagnetization time of a secondary diode of a transformer of the switching power supply, a control module used for outputting a reference voltage signal of a power switch tube of the switching power supply and outputting a switching signal to control conduction time and operating frequency of the power switch tube, a linear pressure compensation module which is respectively connected with the demagnetization time sapling module and the control module and is used for generating compensating current according to the demagnetization time and the reference voltage signal and overlaying the compensating current into an output feedback circuit of the switching power supply to compensate pressure drop generated by load circuit wires, and a startup module used for controlling opening and closing of the linear pressure compensation device. By the adoption of the device provided by the invention, accurate compensation of online pressure drop can be realized, and output load regulation of the switching power supply is improved. The invention also puts forward a switching power supply system.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a line voltage compensation device and a switching power supply system for switching power supplies. Background technique [0002] The chip using the primary control detects the output voltage through the voltage coupling between the secondary winding and the auxiliary winding of the transformer, such as figure 1 shown. Because the energy transfer method of the flyback topology is that the DC input voltage charges the primary inductor when the power transistor Q1 is turned on, and the energy on the primary inductor is transferred to the secondary when the power transistor Q1 is turned off, so the detection of the output voltage can only occur in the secondary The degaussing time of stage diode D7 (T DS )Inside. The output voltage is sent to the inside of the chip after being coupled by the secondary winding of the transformer and the auxiliary winding and divi...
Claims
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Inventor 王文情张海泉叶文辉杨小华
Owner BYD SEMICON CO LTD