Valley detection circuit
A technology for detecting circuits and circuits, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc.
Inactive Publication Date: 2018-02-02
长沙方星腾电子科技有限公司
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Problems solved by technology
[0004] In order to solve the technical problem that the existing valley detection circuit can only be used in specific applications, the present invention provides a valley detection circuit
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[0008] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the present invention.
[0009] Such as figure 1 As shown, a valley detection circuit provided by the present invention includes: a differential circuit 1, an analog-to-digital conversion circuit 2 and a digital signal processing circuit 3; the differential circuit 1 is connected to the analog-to-digital conversion circuit 2, and the analog-to-digital conversion circuit 2 is connected to a digital signal Processing circuit 3, differentiati...
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The invention provides a valley detection circuit, belonging to the technical field of semiconductor integrated circuits. The valley detection circuit comprises a differential circuit, an analog-to-digital conversion circuit and a digital signal processing circuit connected in order. The differential circuit carries out differentiation processing on a resonant signal, the data of the resonant signal before valley is changed to be a negative number, the data after the valley is changed to be a positive number, and the data at a valley point becomes zero. Analog data which is subjected to differentiation processing is sent into an analog-digital conversion circuit, the analog-digital conversion circuit converts the analog data into digital data, the whole process that the data obtained afterthe differentiation processing of the resonant signal becomes the negative number, zero and then the positive number can be completely reflected and then is sent into a digital signal processing circuit, after the processing of the digital signal processing circuit, the whole process of approaching the valley, reaching the valley and leaving the valley can be obtained, all waveforms of the wholeresonant signal near the valley are accurately tracked, the behavior of an entire flyback converter after going into the valley is prepared in advance, and thus the precise valley of the resonant signal can be detected.
Description
Technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, and particularly relates to a valley detection circuit. Background technique [0002] Because the flyback converter is simple in structure and low in cost, it is very suitable as an auxiliary power supply for large-scale electronic equipment and a power supply for consumer electronic products, so it has been widely used. When the flyback converter works, after the switch tube is turned on, the primary current of the transformer gradually increases, and the energy storage of the magnetic core of the transformer also gradually increases. When the switch tube is turned off, the stored energy of the transformer is coupled to the secondary side, the rectifier diode is turned on, and the stored energy of the transformer is output to the load. After all the energy stored in the transformer is output, the secondary side rectifier diode is turned off, and the transformer magnetizing ...
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Login to View More IPC IPC(8): H02M3/335G01R19/175
CPCH02M3/33523G01R19/175
Inventor 不公告发明人
Owner 长沙方星腾电子科技有限公司