A Method to Keep the Peak Current of Dual Windings Constant
A peak current, double winding technology, used in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the problem that the chip cannot accurately predict the peak current of the inductor, and achieve the effect of ensuring the peak current.
Active Publication Date: 2020-07-28
武汉上水微电子科技有限公司
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[0002] In the traditional dual-winding ACDC (AC-to-DC converter), since the VCC capacitor of the chip needs to periodically pass the inductor current to replenish energy, the actual peak current is larger than the chip detects, and the chip often cannot accurately predict the inductor current. Peak current, the magnitude of the peak current is directly related to various characteristics of the transformer, such as maximum power, constant current, transformer design, etc. Therefore, it is of great significance to ensure the constant peak current when the maximum current cannot be seen.
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[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0015] This invention provides a method to keep the peak current of double winding constant, please participate in figure 1 , figure 1 It is a circuit structure diagram of the method for keeping the peak current of the dual windings constant provided by the present invention. The method of keeping the peak current of the dual windings constant includes:
[0016] Set the 50% VLIM peak voltage signal, the chip samples through the Rcs resistance, and compares i...
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The embodiment of the invention discloses a method for maintaining double-winding peak current constant. The method comprises the following steps: sampling a chip through a Rcs resistor to obtain a 50%VLIM peak current signal, comparing by using a comparator, sending an obtained result to an IPK Loop peak current computing loop, computing through the IPK Loop peak current computing loop, and sending the result TCX to a Logic module, and then achieving an aim of precisely controlling the chip peak current through the control of Storage Time Control circuit and a Drive module. Through the methodof maintaining the double-winding peak current constant disclosed by the invention, the double-winding peak current constant can be guaranteed under the condition that the inductive current cannot beseen.
Description
technical field [0001] The invention relates to a method for keeping the peak current constant, in particular to a method for keeping the peak current of double windings constant. Background technique [0002] In the traditional dual-winding ACDC (AC-to-DC converter), since the VCC capacitor of the chip needs to periodically pass the inductor current to replenish energy, the actual peak current is larger than the chip detects, and the chip often cannot accurately predict the inductor current. Peak current, the magnitude of the peak current is directly related to various characteristics of the transformer, such as maximum power, constant current, transformer design, etc. Therefore, it is of great significance to ensure the constant peak current when the maximum current cannot be seen. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to propose a method for keeping the peak current of the double winding cons...
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IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 张宾
Owner 武汉上水微电子科技有限公司