Bus capacitor ripple suppression method and power conversion circuit
A bus capacitor and ripple suppression technology, which is applied in the direction of 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 ripple reduction. Wave voltage is small, avoiding the effect of excessive temperature rise
Active Publication Date: 2021-07-09
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 purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0066] The bus capacitance 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 can also ...
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The invention provides a bus capacitor ripple suppression method and a power conversion circuit, which are applied to the technical field of power electronics. The method comprises the steps of determining a target phase difference between a pre-stage driving signal and a post-stage driving signal according to an obtained target electrical parameter after the target electrical parameter of the power conversion circuit is obtained. As the ripple voltage change of the bus capacitor has a direct corresponding relationship with the phase difference between the pre-stage driving signal and the post-stage driving signal, the practical target phase difference is the phase difference which enables the ripple voltage of the bus capacitor in the power conversion circuit to be minimum. The pre-stage driving signal and the post-stage driving signal are outputted according to the target phase difference so as to ensure that the ripple voltage of the bus capacitor is minimum. Compared with the prior art, the method can achieve the purpose of suppressing the ripple of the bus capacitor under the condition of avoiding newly adding a hardware circuit, thereby effectively preventing the temperature rise of the bus capacitor from being too high, and meanwhile, cost control of the power conversion circuit is facilitated.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a bus capacitor 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, it is often necessary to use a two-stage power conversion circuit. see figure 1 , figure 1 It is a structural schematic 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 front-stage conversion circuit, and the rear-stage conversion circuit is driven by the rear-stage driving signal. Furthermore, there is also a bus capacitor C between the front-stage conversion circuit and the rear-stage conversion circuit. During the operation of the two-stage power conversion circuit, the bus capacitor temperature often occur...
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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