Signal sampling method and related device
A technology of signal sampling and sampling time, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as affecting the quality of the sampling signal, the circuit cannot work normally, and the signal used is susceptible to interference, and achieves the effect of reducing the impact.
Active Publication Date: 2021-12-07
SHENZHEN WINLINE TECH
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Problems solved by technology
If the sampling signal in the circuit is sampled at the same time, the signal will be easily interfered, which will affect the quality of the sampling signal. When the interference is serious, the circuit will not work properly.
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[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this 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 creative efforts fall within the protection scope of this application.
[0022] The terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method...
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The invention discloses a signal sampling method and a related device, which are applied to a controller of a switching circuit. The switching circuit comprises the controller, a driving circuit and a switching tube, the controller is connected with the driving circuit, the driving circuit is connected with the switching tube, and the method comprises the following steps: a first turn-on moment and a first turn-off moment of the switching circuit are determined, the first turn-on moment is a turn-on starting moment of the switch tube of the switch circuit in a current period, the first turn-off moment is a turn-off moment of the switch tube in the current period, and the current period refers to a control period of the controller on the switch tube; a sampling time node is calculated, the sampling time node and the first turn-on moment are spaced by a first preset time, and the sampling time node and the first turn-off moment are spaced by a second preset time; and input sampling and / or output sampling is performed according to the sampling time node. According to the invention, the sampling time node is set by avoiding the first turn-on moment and the first turn-off moment, so that the influence of turn-on and turn-off of the switching tube on the sampling signal is reduced.
Description
technical field [0001] The present application relates to the technical field of switch circuit control, in particular to a signal sampling method and a related device. Background technique [0002] In switching power supplies, such as BUCK, BOOST, forward, flyback, phase-shifted full bridge and other circuits, most of them are controlled by PWM / PFM (Pulse Width Modulation / Pulse Frequency Modulation). In the prior art, in order to pursue high power density of the product, the switching frequency is designed to be higher and higher, and the switching loss also increases accordingly. Since most circuits can only achieve soft turn-on under heavy load, turn-off is still hard turn-off. [0003] The switching tube works in the hard switching state, and the switching speed of the tube is fast, which will generate a large dv / dt or di / dt. If the sampling signal in the circuit is sampled at the same time, the signal will be easily interfered, affecting the quality of the sampling si...
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IPC IPC(8): H02M1/00H02M1/08
CPCH02M1/00H02M1/08
Inventor 踪成林宫兆兴钟镇壑陈小平张凯旋李晨光朱建国
Owner SHENZHEN WINLINE TECH