Control device and control method of DC-DC conversion circuit
A technology of DC-DC and conversion circuits, which is applied in the field of control devices of DC-DC conversion circuits, can solve the problems of not meeting the input voltage in a wide range, reducing the efficiency of DC-DC converters, increasing system circulation, etc., and achieving increased softness Effect of switching range, reducing power loss, and improving conversion efficiency
Active Publication Date: 2020-06-12
合肥阳光电动力科技有限公司
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Problems solved by technology
In the prior art, the method of frequency conversion control or phase shift control is usually used to modulate the DC-DC converter, but the frequency conversion control makes the voltage gain of the DC-DC converter less than 1, which does not meet the requirements of a wide range of input voltage; phase shift control When the input voltage range is wide, the phase shift angle of the DC-DC converter changes greatly, thereby increasing the system circulation, resulting in a decrease in the efficiency of the DC-DC converter
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0033] figure 1 A structural block diagram of a control device for a DC-DC conversion circuit provided by an embodiment of the present invention, figure 2 A schematic structural diagram of a DC-DC conversion circuit provided by an embodiment of the present invention, the DC-DC conversion circuit 100 includes a first voltage module 101 and a second voltage module 102, connected to the first voltage module 101 and the second voltage module 102 A series resonant module 102 between them, and a transformer 103 and a ...
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The embodiment of the invention discloses a control device and a control method of a DC-DC conversion circuit. The control device comprises a signal acquisition module, a soft switching state controlmodule, a phase shift control module and a drive control module, wherein the signal acquisition module is used for acquiring an input voltage, an output voltage and an output current of the DC-DC conversion circuit, and the phase shift control module is used for adjusting a phase shift angle of the DC-DC conversion circuit according to the output voltage and the output current; the soft switchingstate control module is used for outputting and adjusting the switching frequency of the DC-DC conversion circuit so as to increase the soft switching range of the DC-DC conversion circuit; and the driving control circuit is used for generating a driving signal of the DC-DC conversion circuit according to the phase shift angle and the switching frequency. According to the technical scheme providedby the embodiment of the invention, the soft switching range of the DC-DC conversion circuit can be enlarged, and the power loss is reduced, so the conversion efficiency is improved while the wide-range input voltage of the DC-DC conversion circuit is realized.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of power electronics, and in particular to a control device and a control method for a DC-DC conversion circuit. Background technique [0002] With the rapid development of electric vehicles, people's requirements for electric vehicles are getting higher and higher, and higher requirements are placed on the conversion efficiency of battery systems. [0003] At present, the energy storage equipment of electric vehicles includes power batteries that supply power to high-voltage electronic control units such as drive motors and low-voltage batteries that supply power to vehicle lighting and display equipment. DC-DC converters convert the high-voltage power of power batteries into low-voltage power Charge the battery. The conversion efficiency of the DC-DC converter directly affects the safe and reliable operation of the vehicle. In the prior art, the method of frequency conversion contro...
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Login to View More IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0058Y02B70/10
Inventor 冯孝伟王梁王辉于安博
Owner 合肥阳光电动力科技有限公司