A high-efficiency buck-boost converter and its control method
The technology of a buck-boost converter and control method is applied in the direction of output power conversion device, conversion equipment without intermediate conversion into AC, conversion of DC power input into DC power output, etc., which can solve the problem of large conduction loss and power supply efficiency. Problems such as breakthroughs and improvements cannot be obtained, and the effects of reduced conduction loss, low cost, and high degree of circuit integration can be achieved
Active Publication Date: 2016-06-01
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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[0024] Therefore, in summary, the conduction loss of the power conversion circuit in the prior art is relatively large, and the efficiency of the power supply cannot be broken through and improved. It is yet to be proposed a power conversion circuit that can not only realize buck-boost, but also has low loss and high efficiency. conversion circuit
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[0048] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.
[0049] refer to figure 2 , shows a circuit block diagram of an embodiment of a high-efficiency buck-boost converter according to the present invention; the buck-boost converter includes a first inductor L 11 and the second inductance L 22 , the first inductance L 11 The first terminal of the buck-boost converter is connected to the inp...
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The invention discloses a high-efficiency buck-boost converter and its control method, which adopts a power conversion circuit architecture that connects boost and buck in parallel, and shares a control circuit, and the control circuit is based on the converter's The relationship between the input terminal voltage and the output terminal voltage is used to select and control the main circuit to work in the boost mode or the buck mode or to work in the boost and buck modes simultaneously. Compared with the prior art, its circuit integration is high and the cost is low. And the conduction loss is greatly reduced.
Description
technical field [0001] The present invention relates to power electronics technology, more specifically, to a high-efficiency buck-boost converter and its control method. Background technique [0002] In applications where the power supply voltage or battery power supply is unstable, such as in a car, the input voltage of the power supply may be higher or lower or close to its output voltage. In order to provide a stable power supply to the load, the traditional solution has a single-stage There are two types of power conversion and two-stage power conversion. Figure 1(a)-(e) shows the circuit diagrams of several power conversion methods commonly used in the prior art, but the conduction losses of these types of power conversion are relatively high. large, the power efficiency cannot be further improved. [0003] As shown in Figure 1(a) and Figure 1(b), they are SEPIC power conversion circuit and ZETA power conversion circuit composed of inductor L1, switch tube Q1, capacit...
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IPC IPC(8): H02M3/04
CPCH02M3/1582H02M3/1584
Inventor 陈伟
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD