Switching converter and zero-cross detection circuit and zero-cross detection method thereof

A zero-crossing detection circuit and zero-crossing technology, applied in the direction of measuring current/voltage, converting DC power input to DC power output, instruments, etc., can solve the problem that the bias signal cannot be applied to the application occasion, and the zero-crossing comparison cannot be well eliminated In order to achieve the effect of reducing circuit loss, improving precision and improving efficiency

Pending Publication Date: 2022-05-24
SG MICRO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 1 As shown, the current source 130 and the resistor Rc are used to superimpose a bias signal on the switch node voltage Vsw, but such a bias signal is not suitable for all applicatio

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  • Switching converter and zero-cross detection circuit and zero-cross detection method thereof
  • Switching converter and zero-cross detection circuit and zero-cross detection method thereof
  • Switching converter and zero-cross detection circuit and zero-cross detection method thereof

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Embodiment Construction

[0027] The present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, like elements are designated by like reference numerals. For the sake of clarity, various parts in the figures have not been drawn to scale. Additionally, some well-known parts may not be shown in the drawings.

[0028] Numerous specific details of the invention are described below, such as the construction of components, materials, dimensions, processing and techniques, in order to provide a clearer understanding of the invention. However, as can be understood by one skilled in the art, the present invention may be practiced without these specific details.

[0029] It should be understood that in the following description, "circuitry" may include single or multiple combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by the programmable circuits. When an elemen...

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Abstract

The invention discloses a switching converter and a zero-cross detection circuit and a zero-cross detection method thereof. The zero-crossing detection circuit comprises a voltage sampling module, a bias module and a zero-crossing comparator, the voltage sampling module generates a sampling signal equal to the direct-current output voltage, the bias module generates a corresponding bias signal according to the sampling signal, the zero-crossing comparator compares a superposed signal of the signal to be detected and the bias signal with a zero-crossing reference value, and the zero-crossing comparator outputs the signal to be detected. Therefore, a zero-crossing indication signal is obtained. According to the zero-cross detection circuit, the sampling signal equal to the direct-current output voltage is simulated and generated in the chip, and the compensation quantity of the bias module is adaptively adjusted according to the sampling signal, so that the compensation quantity is basically equal to the variable quantity of the switch node voltage during the delay period; under different application occasions, the influence of the zero-crossing comparator and subsequent logic control delay on the zero-crossing detection precision can be reduced, the zero-crossing detection precision is improved, the circuit loss of the switching converter is reduced, and the efficiency of the switching converter is improved.

Description

technical field [0001] The present invention relates to the technical field of semiconductor integrated circuits, and more particularly to a switching converter, a zero-crossing detection circuit and a zero-crossing detection method thereof. Background technique [0002] At present, wearable devices and IoT devices are mostly powered by lithium batteries, so the efficiency of switching power supply products is becoming more and more important. The power supplies used in modern electronic equipment are roughly divided into linear regulated power supplies and switching regulated power supplies. The regulator tube of the linear regulated power supply works in the amplification area, which has the advantages of not introducing additional interference, good reliability and low cost, but it also has the disadvantages of large volume and low conversion efficiency. Compared with linear regulated power supply, switching regulated power supply has the characteristics of boosting and ...

Claims

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Application Information

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IPC IPC(8): H02M1/088H02M3/158G01R19/175
CPCH02M1/088H02M3/1582H02M3/1588G01R19/175Y02B70/10
Inventor 孙健张宝全李精文
Owner SG MICRO
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