High efficiency DC-DC conversion device in light load
A technology of DC-DC and conversion devices, which is applied in the direction of output power conversion devices, conversion of DC power input to DC power output, instruments, etc., which can solve the problem of low efficiency of DC-DC converters at light loads and shorten the battery life of portable electronic devices Use time and other issues to achieve the effect of improving efficiency, reducing switching loss, and reducing static loss
Active Publication Date: 2014-03-19
深圳德信微电子有限公司
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figure 2 A simplified circuit diagram of such a DC-DC converter is shown as figure 2 As shown, the converter generates the gate terminal control signal of the power MOS transistor through the PWM comparator. The frequency is fixed, and the switching loss related to the frequency does not decrease with the decrease of the load, and the analog circuits inside the chip are always working, and the static loss does not decrease, which leads to the light load of the entire DC-DC converter Extremely inefficient, reducing battery life in portable electronic devices when applied
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[0023] The present invention will be further described below in conjunction with accompanying drawings and embodiments thereof.
[0024] refer to image 3 , the light-load high-efficiency DC-DC conversion device of the present invention includes: an upper tube light-load detector 1, a lower tube light-load detector 2, a light-load high-efficiency controller 3, an error amplifier 4, a modulation and power output device 5 and Filter and Feedback 6. Wherein, the modulation and power output device 5 is provided with an input terminal, an output terminal, a sleep control terminal ST, an upper power tube detection terminal HS, a lower power tube detection terminal LS and an edge detection terminal PD, and the input terminal passes through the error amplifier 4 is connected to the second output terminal E of the light-load high-efficiency controller 3, the output terminal is connected to the inverting input terminal of the error amplifier 4 through the filter and feedback device 6, ...
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The invention discloses a high efficiency DC-DC conversion device in a light load and mainly solves a problem that high efficiency of a DC-DC conversion device is difficult to achieve in the light load. The DC-DC conversion device comprises an upper pipe light load detector, a lower pipe light load detector, a light load high efficiency controller, an error amplifier, a modulation and power output device and a filtering and feedback device. Through simultaneous working of the upper pipe light load detector and the lower pipe light load detector, obtaining an accurate light load determination signal in various work duty ratios is ensured. When entering into light load working, the light load determination signal is valid, the light load high efficiency controller generates a dormancy control signal, and the DC-DC conversion device is controlled to switch in working and dormancy states. Since the DC-DC conversion device is stopped from turning on and off in the dormancy state, power consumption of an internal circuit is minimized, thus efficiency in the light load is substantially raised, and a service time of a cell of a portable instrument is prolonged.
Description
technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an analog integrated circuit, in particular to a DC-DC converter capable of realizing high efficiency under light load, which can be used in various portable electronic products. Background technique [0002] As an important power management circuit, DC-DC converters are widely used in various portable products such as mobile phones, tablet computers and digital cameras. Compared with linear regulators, switching power management chips, such as DC-DC converters, have the biggest advantage of high efficiency. In portable applications, the efficiency of DC-DC under light load largely determines the standby time of the portable product system. Therefore, in recent years, the design of low power consumption and high efficiency has become one of the research hotspots of many portable applications. [0003] The power consumption of a DC-DC converter generally consists of th...
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IPC IPC(8): H02M3/157
Inventor 来新泉王红义刘雨鑫刘洁张家祯
Owner 深圳德信微电子有限公司