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Применить Всего найдено 7. Отображено 7.
05-05-2023 дата публикации

High-precision current sampling circuit with rail-to-rail common-mode input range

Номер: CN116073831A
Автор: ZHOU ZEKUN, DAI YUN, LOU JIANLI, WANG ZHUO, ZHANG BO
Принадлежит:

The invention belongs to the technical field of analog circuits, and particularly relates to a high-precision current sampling circuit with a rail-to-rail common mode input range. The invention aims to solve the problems that a traditional current sampling circuit is not high enough in precision, a common-mode input voltage range is not enough to cover user demand changes, and current detection imbalance is caused by various unsatisfactory factors which are not easy to correct. Based on the advantage of high sampling precision of resistance sampling current, a resistance sampling structure which is based on an operational amplifier and has a symmetrical structure is used, the structure comprises two operational amplifiers, namely a high-voltage operational amplifier and a low-voltage operational amplifier, which are controlled by a logic level, so that a rail-to-rail common-mode input range can be achieved, and the stability of the common-mode input is improved. And meanwhile, the device ...

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Номер записи: 1
21-04-2023 дата публикации

Enabling circuit

Номер: CN115996049A
Автор: WANG ZHUO, WU HUI, HE JINYANG, YANG YANG, ZHOU ZEKUN, ZHANG BO
Принадлежит:

The invention belongs to the technical field of analog integrated circuits, and particularly relates to an enabling circuit. The invention provides an enabling circuit capable of giving consideration to two enabling forms. A rising edge of an enable signal is firstly detected, a chip is directly controlled to be started, meanwhile, an external enable signal is detected, and if the enable signal is detected to be a level signal, the chip is closed after the enable signal is invalid; and if the signal is detected to be a pulse signal, the chip is still kept to be opened after the enabling is invalid, and the chip is closed until the pulse of the next enabling signal is detected.

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Номер записи: 2
16-05-2023 дата публикации

Overcurrent protection circuit for half-bridge isolation converter

Номер: CN116131218A
Автор: ZHANG BO, REN HANG, LIM JIN-HEE, WANG ZHUO, ZHOU ZEKUN
Принадлежит:

The invention belongs to the technical field of power management integrated circuits, and particularly relates to an overcurrent protection circuit for a half-bridge isolation converter. According to the circuit, after the half-bridge converter triggers over-current protection, the upper tube is still immediately closed to avoid further aggravation of over-current, but in the next period, the upper tube is opened for the same time as the previous period instead of only opening for the minimum time like a traditional over-current protection mechanism; in this way, it is ensured that the main side of the transformer is still charged for the same time in the opposite directions in the two periods before and after the overcurrent period, and the problem of magnetic saturation possibly occurring on the main side of the transformer is effectively solved. And if the over-current phenomenon is still continuous, it is ensured that the upper tube is started according to the minimum conduction time ...

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Номер записи: 3
16-05-2023 дата публикации

Visual congestion effect evaluation method based on contrast modulation grating

Номер: CN116115177A
Автор: ZHOU ZEKUN
Принадлежит:

The invention discloses a visual congestion effect evaluation method based on a contrast modulation grating. The method comprises the following steps: S1, constructing a grating image function; the image is composed of a gray background which is half of the maximum brightness of the display, a white visual fixation point and a grating array, and the grating array is composed of a plurality of gratings; s2, enabling a display to directly face a testee at a set distance, and after the display displays a gray background, setting different orientations of gratings, enabling a grating array to be located at different white visual fixation points, and enabling an image to be in a flashing mode; s3, after the white visual fixation point appears, staring at the white visual fixation point by the testee, and after the grating appears, distinguishing the orientation of the middle grating by using the lateral view and answering; and S4, when the answering direction of the testee is correct, reducing ...

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Номер записи: 4
23-05-2023 дата публикации

Visual noise elimination capability evaluation method based on contrast modulation grating

Номер: CN116149048A
Автор: ZHOU ZEKUN
Принадлежит:

The invention discloses a visual noise elimination capability evaluation method based on a contrast modulation grating. The visual noise elimination capability evaluation method comprises the following steps: S1, combining constructed grating noise images; s2, obtaining a contrast modulation grating image with specific noise; s3, a display for displaying the grating directly faces the testee and has a set distance, the display displays a general gray background with the brightness being the maximum brightness of the display, and evaluation is started; s4, after the image appears, the orientation of the grating is randomly oriented and disappears after being displayed on the screen for a set time, then the testee answers the orientation of the grating, and when the answer orientation of the testee is consistent with the orientation of the grating, the contrast ratio of the grating in the next test is reduced until the testee cannot judge correctly. According to the method, the noise information ...

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Номер записи: 5
18-07-2023 дата публикации

Narrow pulse detection and counting circuit

Номер: CN116449111A
Автор: BI DONGLIANG, ZHOU ZEKUN
Принадлежит:

The invention relates to a narrow pulse detection and counting circuit, and belongs to the field of integrated circuits. An analog circuit design method and a digital circuit design method are combined, narrow pulse signals are filtered out through an analog circuit, and then double-edge sampling is carried out on the signals after the narrow pulses are filtered out through the signals before the narrow pulses are filtered out. The essence is an input signal after the double-edge sampling delay of the input signal is removed. And XNOR operation is carried out according to a sampling result. If the same signal is sampled at the double edges, a narrow pulse is detected, and a high level is output; on the contrary, if the double-edge detection results are different signals, the detected pulse is not the narrow pulse, and the low level is output. According to the method, a high-frequency sampling clock is not needed, the detection delay is only the time of one narrow pulse, the detection output ...

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Номер записи: 6
02-05-2023 дата публикации

Polyethylenedioxythiophene-based fiber thermoelectric material, preparation method and application thereof

Номер: CN116043550A
Автор: ZHANG PENG, LIU ZHEN, MA QIANYUN, WU GAOPENG, ZHAO QIANNING, ZHOU ZEKUN
Принадлежит:

The invention relates to a poly (ethylenedioxythiophene)-based fiber thermoelectric material as well as a preparation method and application thereof, and belongs to the technical field of organic thermoelectric materials. The invention provides a preparation method of a poly (3, 4-ethylenedioxythiophene)-based fiber thermoelectric material. The preparation method comprises the following steps: (1) carrying out ultrasonic cleaning and drying on hygroscopic fibers; (2) soaking the hygroscopic fiber in a Nafion solution and an EDOT solution in sequence, so that Nafion and EDOT are adsorbed on the hygroscopic fiber in sequence; and (3) soaking the fibers obtained in the step (2) in a ferric chloride aqueous solution, and under a heating condition, carrying out a rotary reaction on the obtained fibers in the ferric chloride aqueous solution for 5-120 minutes to obtain the poly (3, 4-ethylenedioxythiophene)-based fiber thermoelectric material. According to the preparation method disclosed by ...

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Номер записи: 7