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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 5. Отображено 5.
02-05-2012 дата публикации

PWM control method

Номер: CN0101499791B
Автор: HUANG QINGYI, TANG ZHI, BI XIAOMENG, QINGYI HUANG, ZHI TANG, XIAOMENG BI
Принадлежит:

The invention discloses a Pulse-Width Modulation (PWM) control method. The switching period of the PWM is determined by an impulse control signal. The switch-on time and the switch-off time of the PWM is determined by a high-frequency carrier signal, a reference signal and an impulse control signal. The high-frequency carrier signal is a slope signal, the slope factor of which is changed among all periods. The reference signal is sampled by one time in each switching period of the PWM. The sampling value is used as a compared value VF; and the switch-on time and the switch-off time of the switching period of the PWM are determined according to the specific value relation of the compared value VF and the corresponding maximum value of the slope signal Vrm. The invention uses the specific value relation of the VF and Vrm and generates signal waveform to be output of the PWM by more simple operation processing and simultaneously can achieve higher precision. The invention adopts FPGA, has ...

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Номер записи: 1
06-01-2010 дата публикации

Power factor correction circuit

Номер: CN0101621247A
Автор: HOULT FRANK, ZHIXIAN WU, LICHAN MENG, XIAOMENG BI, YONGHUI HU, YUN WU, FRANK.HOULT, WU ZHIXIAN, MENG LICHAN, BI XIAOMENG, HU YONGHUI, WU YUN
Принадлежит:

The invention discloses a power factor correction circuit which comprises a first inductor, a second inductor, a first multimodal switch, a second multimodal switch and a first capacitor, wherein the first inductor is connected between the first end of an alternating current power supply and the first end of the first multimodal switch, the second end and the third end of the first multimodal switch is connected to two ends of the first capacitor in a spanned way, the second inductor is connected between the second end of the alternating current power supply and the first end of the second multimodal switch, and the second end and the third end of the second multimodal switch are connected to two ends of the first capacitor in a spanned way. In the invention, a boost PFC circuit provided with the multimodal switches can improve the efficiency and the power density simultaneously. The invention can also reduce ripple waves of the inductors and the capacitor, the switching loss and the on-state ...

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Номер записи: 2
05-08-2009 дата публикации

PWM control method

Номер: CN0101499791A
Автор: BI XIAOMENG, TANG ZHI, HUANG QINGYI, XIAOMENG BI, ZHI TANG, QINGYI HUANG
Принадлежит:

The invention discloses a PWM control method. The switching period of the PWM is determined by an impulse control signal; the switch-on time and the switch-off time of the PWM is determined by a high-frequency carrier signal and a reference signal and an impulse control signal; the high-frequency carrier signal is a slope signal, the slope factor of which is changed among all periods; the reference signal is sampled by one time in each switching period of the PWM; the sampling value is used as a compared value VF; and the switch-on time and the switch-off time of the switching period of the PWM are determined according to the specific value relation of the compared value VF and the corresponding maximum value of the slope signal Vrm. The invention uses the specific value relation of the VF and Vrm and generates signal waveform to be output of the PWM by more simple operation processing and simultaneously can achieve higher precision. The invention adopts FPGA, has the advantages of fast ...

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Номер записи: 3
22-09-2010 дата публикации

Low output loss LLC resonant converter

Номер: CN0101841244A
Автор: XIAOMENG BI, YONGHUI HU, QINGYI HUANG, LICHAN MENG, RUIFEI TIAN, BI XIAOMENG, HU YONGHUI, HUANG QINGYI, MENG LICHAN, TIAN RUIFEI
Принадлежит:

The invention discloses a low output loss LLC resonant converter, comprising an inverter, a resonant circuit, a transformer and a filter circuit, wherein the inverter is formed by arranging at least three bridge arms in parallel, the resonant circuit is formed by at least three groups of resonant capacitances and resonant inductances which are connected in serial and at least three excitation inductances of the transformer with at least three phases, the transformer has at least three phases, the filter circuit is connected to the output end of a rectifying circuit, and the rectifying circuit is the rectifying circuit mixed by at least three phases, which is formed by at least three corresponding inductances and at least three corresponding rectifier tubes. The invention reduces the number of secondary-side output rectifier diodes of the transformer, obviously lowers the loss of an output rectifying circuit, and improves the efficiency of a resonant converter. The ripple frequency of the ...

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Номер записи: 4
23-05-2012 дата публикации

Power factor correction circuit

Номер: CN0101621247B
Автор: HOULT FRANK, ZHIXIAN WU, LICHAN MENG, XIAOMENG BI, YONGHUI HU, YUN WU, FRANK.HOULT, WU ZHIXIAN, MENG LICHAN, BI XIAOMENG, HU YONGHUI, WU YUN
Принадлежит:

The invention discloses a power factor correction circuit which comprises a first inductor, a second inductor, a first multimodal switch, a second multimodal switch and a first capacitor, wherein the first inductor is connected between the first end of an alternating current power supply and the first end of the first multimodal switch, the second end and the third end of the first multimodal switch is connected to two ends of the first capacitor in a spanned way, the second inductor is connected between the second end of the alternating current power supply and the first end of the second multimodal switch, and the second end and the third end of the second multimodal switch are connected to two ends of the first capacitor in a spanned way. In the invention, a boost PFC circuit provided with the multimodal switches can improve the efficiency and the power density simultaneously. The invention can also reduce ripple waves of the inductors and the capacitor, the switching loss and the on-state ...

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Номер записи: 5