A busbar capacitor ripple suppression method and power conversion circuit
A bus capacitance and ripple suppression technology, applied in output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of power conversion circuit manufacturing costs and increased operation and maintenance costs, and achieve cost control and avoidance. The effect of high temperature rise and ripple suppression
Active Publication Date: 2022-07-12
合肥阳光电动力科技有限公司
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Problems solved by technology
[0004] Apparently, the prior art scheme of suppressing bus capacitor ripple by adding an additional DC-AC inverter circuit will inevitably lead to an increase in the manufacturing cost of the power conversion circuit and the cost of operation and maintenance.
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[0065] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0066] The bus capacitor ripple suppression method provided by the embodiment of the present invention can be applied to the controller of the two-stage power conversion circuit, and can also be applied to other controllers in the power supply system described in the two-stage power conversion circuit, Of course, in some cases, it c...
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The bus capacitance ripple suppression method and the power conversion circuit provided by the present invention are applied to the technical field of power electronics. After acquiring the target electrical parameters of the power conversion circuit, the method determines the pre-stage driving signal and the post-stage driving signal according to the obtained target electrical parameters. The target phase difference between the signals, because the ripple voltage change of the bus capacitor has a direct corresponding relationship with the phase difference between the front-stage driving signal and the rear-stage driving signal, the practical target phase difference of the present invention is to make the power conversion circuit in the power conversion circuit. The ripple voltage of the bus capacitor has the smallest phase difference. Therefore, outputting the pre-stage driving signal and the post-stage driving signal according to the target phase difference can ensure that the ripple voltage of the bus capacitor is the smallest. Compared with the prior art, this method can In the case of avoiding adding new hardware circuits, the purpose of suppressing the ripple of the bus capacitor is achieved, thereby effectively preventing the temperature rise of the bus capacitor from being too high, and at the same time, it is beneficial to the cost control of the power conversion circuit.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a busbar capacitance ripple suppression method and a power conversion circuit. Background technique [0002] In practical application scenarios with a wide input voltage range and a large load variation range, a two-stage power conversion circuit is often required. see figure 1 , figure 1 It is a schematic structural diagram of a two-stage power conversion circuit in the prior art. The power conversion circuit includes a front-stage conversion circuit and a rear-stage conversion circuit. The signal drives the former stage conversion circuit, and the latter stage conversion circuit is driven by the latter stage driving signal. Further, between the front-stage conversion circuit and the rear-stage conversion circuit, a bus capacitor C is also provided. During the operation of the two-stage power conversion circuit, the bus capacitor often occurs due to the ...
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IPC IPC(8): H02M1/14
CPCH02M1/14Y02E40/40
Inventor 张震汪磊王渭
Owner 合肥阳光电动力科技有限公司