LLC resonant converter with wide load range
A resonant conversion and wide-load technology, which is applied to output power conversion devices, DC power input conversion to DC power output, and adjustment of electrical variables, can solve problems such as easy hiccup mode, high light-load frequency, and high circuit cost. , to achieve the effect of reducing circuit cost, high efficiency and simple structure
Active Publication Date: 2017-02-15
HANGZHOU DIANZI UNIV
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Problems solved by technology
[0009] The technical problem to be solved by the present invention is to provide a new type of LLC resonant conversion device to overcome the problem that the traditional LLC resonant converter is easy to enter the hiccup mode when the light load frequency is too high when it is applied to a wide load range, and other solutions or complicated control or high circuit cost
Method used
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[0030] In order to describe the technical solutions and advantages of the present invention in more detail, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. For the sake of clarity, various parts in the drawings have not been drawn to scale.
[0031] refer to figure 2 , an LED driving device based on a full-wave rectification half-bridge LLC resonant converter according to an embodiment of the present invention. The LED driving device includes an LLC resonant converter main circuit 200 and such as figure 1 The LLC drive control circuit 100 shown in .
[0032] The LLC resonant converter main circuit 200 includes a square wave generating circuit 201, a resonant network circuit 202, a transformer T1, an output rectifying circuit 203, an LED load and an output current sampling circuit.
[0033] The square wave generation circuit 201 includes a DC power supply Vin for providing the main circuit power supply vol...
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The invention discloses an LLC resonant converter with a wide load range. Load current of the LLC resonant converter directly flows through a secondary winding of a variable inductor, so that a resonance inductance value in a resonant network is controlled to be changed with the change of output current, such as, the variable resonance inductance value is the minimum when the output current is the maximum, and the ratio between an excitation inductance value of a transformer is the minimum, thus a high full load efficiency can be obtained; while with the decrease of the output current, the variable resonance inductance value increases, and the ratio between the excitation inductance value of the transformer increases, thus the load output range is widened; and on the premise of obtaining constant current characteristics of wide range load current, the LLC resonant converter with provided by the invention can obtain a relatively high efficiency, and meanwhile, the LLC resonant converter and a control circuit are of a simple structure, and a complicated driving device and a drive and control circuit are not needed, thereby reaching the purpose of reducing the circuit cost and improving the efficiency and stability of a driver.
Description
technical field [0001] The invention belongs to the field of DC / DC converters and LED lighting, and in particular relates to an LLC resonant conversion device with a wide load range. Background technique [0002] After the 21st century, LED has been rapidly promoted and applied as a new generation of green lighting. With the development of new technologies, further improving lighting efficiency and improving the lighting environment, LED lighting with higher power and dimming output has gradually become a new development trend. LLC resonant converter, because of its own working characteristics, can achieve high efficiency, high power density and high stability, so it can be widely concerned and applied. [0003] figure 1 Shown is a simplified schematic diagram of a prior art LLC resonant converter used in an LED driver, and the LED driver includes an LLC resonant converter main circuit and an LLC drive control circuit. Among them, the main circuit of the LLC resonant conv...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M3/338
CPCH02M3/3381H02M3/3385Y02B70/10
Inventor 谢小高马伟中韩杨
Owner HANGZHOU DIANZI UNIV