Switching power supply circuit, control method thereof, power supply chip and related system
A technology of switching power supply circuit and power supply voltage, which is applied in the direction of control/regulation system, electrical components, and adjustment of electric variables, etc. It can solve the problems of reducing the applicability of switching power supply circuit and limiting the application scenarios of switching power supply circuit, so as to improve the applicability Effect
Pending Publication Date: 2022-01-04
CELLWISE MICROELECTRONICS CO LTD DONGGUAN
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Problems solved by technology
[0003] The defect of the existing technology is that the switching power supply circuit needs to receive a driving signal to provide a higher power supply voltage than the power supply voltage, and the traditional negative feedback waveform generation circuit still requires a relatively large input voltage due to devices such as amplifiers. This makes the power supply voltage at least greater than the input voltage required by the negative feedback waveform generation circuit, which greatly limits the application scenarios of the switching power supply circuit and reduces the applicability of the switching power supply circuit
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[0021] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0022] The terms "first" and "second" in this application are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cov...
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The invention relates to the technical field of power electronics, and discloses a switching power supply circuit and a control method thereof, a power supply chip and a related system. The switching power supply circuit comprises a self-excited oscillation circuit and aboost switching power supply circuit; the input end of the self-excited oscillation circuit receives a power supply voltage, and the output end of the self-excited oscillation circuit is used for outputting a first driving signal; the boost switching power supply circuit is connected with the output end of the self-excited oscillation circuit, the boost switching power supply circuit receives the power supply voltage, and the first driving signal is used for driving a switching tube of the boost switching power supply circuit to be switched on or switched off, so that the boost switching power supply circuit outputs the power supply voltage. The lowest power supply voltage required by operation of the switching power supply circuit can be reduced. Based on the technical scheme of the invention, the applicability of the switching power supply circuit can be improved.
Description
technical field [0001] This application relates to the field of power electronics technology, in particular to switching power supply circuits and their control methods, power chips and related systems. Background technique [0002] In the prior art, a switching power supply circuit is generally used to provide a power supply voltage higher than a power supply voltage, and based on the power supply voltage, supply power to a working circuit that requires a higher input voltage. [0003] The defect of the prior art is that the switching power supply circuit needs to receive a driving signal to provide a higher power supply voltage than the power supply voltage, while the traditional negative feedback waveform generation circuit still requires a relatively large input voltage due to devices such as amplifiers. This makes the power supply voltage at least greater than the input voltage required by the negative feedback waveform generating circuit, which greatly limits the appli...
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IPC IPC(8): H02M3/338
CPCH02M3/3385
Inventor 顾仲跃
Owner CELLWISE MICROELECTRONICS CO LTD DONGGUAN