Alternating current zero crossing point detection circuit and chip
A technology of zero-crossing detection and alternating current, which is applied in the direction of using alternating current to direct current for measurement, can solve the problem of inaccurate zero-crossing, achieve the effects of improving accuracy, reducing energy consumption, and easy application
Pending Publication Date: 2020-09-11
深圳市芯澜电子技术有限公司
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[0006] In order to solve the above-mentioned inaccurate technical problem in the prior art about simultaneously detecting the zero-crossing point of the rising edge and the falling edge, the present invention proposes an alternating current zero-crossing detection circuit and chip
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[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0028] Thus, a feature indicated in this specification will be used to describe one of the features of an embodiment of the present invention, rather than implying that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes a number of features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly described. Thus, the illustrated combinations are not intended to be limiting unless oth...
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The invention discloses an alternating current zero crossing point detection circuit and a chip, and the alternating current zero crossing point detection circuit comprises an electricity taking and alternating current shaping unit which is used for generating square waves with the same frequency and phase based on alternating current; an edge pulse generation unit which is electrically connectedto the power taking and alternating current shaping unit and is used for generating an edge pulse at the alternating current zero crossing point based on the square waves; and a zero-crossing pulse generation unit which is electrically connected to the edge pulse generation unit and is used for generating a zero-crossing pulse based on the edge pulse. According to the invention, the zero-crossingpoint of the rising edge and the zero-crossing point of the falling edge of the alternating current can be detected at the same time, and the zero-crossing point detection precision is improved.
Description
technical field [0001] The invention relates to the technical field of alternating current zero-crossing detection, in particular to an alternating current zero-crossing detection circuit and a chip. Background technique [0002] The AC zero-crossing detection circuit is a common circuit in the fields of thyristor control circuits, high-power equipment or electrical access, power carrier communication, and lighting control. These fields all need to accurately detect the zero-crossing point of the AC voltage, generate a zero-crossing pulse or a level signal at the zero-crossing point as a reference signal for system control, or obtain the AC cycle, voltage fluctuation, phase, etc. of the AC power based on the zero-crossing detection signal Related Information. [0003] The current AC zero-crossing detection circuits are all based on discrete components. The circuit structure is complex, and the zero-crossing signal can only be generated on the rising or falling edge of the A...
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IPC IPC(8): G01R19/22
CPCG01R19/22
Inventor 曾明辉黄威盛毛锴
Owner 深圳市芯澜电子技术有限公司