Method for controlling power conversion device
A technology of a power conversion device and a control method is applied to the output power conversion device, the conversion of DC power input to DC power output, the conversion of AC power input to DC power output, etc., which can solve the problem of limiting the performance of the converter and increasing the cost of the converter. , the number of layers, etc.
Pending Publication Date: 2022-07-01
DELTA ELECTRONICS INC
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Problems solved by technology
The circuit of Scheme 2 is easy to implement and has high reliability, but its duty cycle is limited to less than 0.5, and the volume of the magnetic element and the voltage stress of the secondary switch tube cannot be further reduced, which limits the performance of the converter
Furthermore, in Solution 2, due to the large number of transformer turns, the required number of PCB layers is large, which leads to a substantial increase in the cost of the converter
Method used
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[0075] Some typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the description that follows. It should be understood that the present disclosure is capable of various changes in different aspects, all without departing from the scope of the present disclosure, and the descriptions and drawings therein are for illustrative purposes only, not for limitation. this disclosure.
[0076] figure 1 This is a schematic diagram of a circuit structure of a power conversion device according to a preferred embodiment of the present disclosure. like figure 1 As shown, the power conversion device 1 includes an input terminal, a first bridge arm 12, a second bridge arm 13, two transformers T1, T2 and an output capacitor Co, wherein the input terminal is electrically connected to the DC voltage source 11 and has an input positive terminal Vin+ And the input negative terminal Vin-, the DC voltage source 11 provides the input vol...
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The invention provides a control method of a power conversion device. The power conversion device comprises a first bridge arm, a second bridge arm and two transformers. The first bridge arm comprises first to third switch tubes which are connected in series, and the second bridge arm comprises fourth to sixth switch tubes which are connected in series. The windings of the two transformers are connected in series between the nodes of the two bridge arms. The control method comprises the following steps: controlling the first switch tube and the fourth switch tube to operate at a duty ratio, wherein the switching time sequences are mutually staggered by 180 degrees; control signals for controlling the third switch tube and the fourth switch tube are complementary, and control signals for controlling the sixth switch tube and the first switch tube are complementary; and when the duty ratio is less than or equal to 0.5, controlling the second and fourth switching tubes to be synchronously switched on and off and the fifth and first switching tubes to be synchronously switched on and off, and when the duty ratio is greater than 0.5, controlling the second and sixth switching tubes to be synchronously switched on and off and the fifth and third switching tubes to be synchronously switched on and off.
Description
technical field [0001] The present disclosure relates to a control method, in particular to a control method of a power conversion device. Background technique [0002] With the rapid development of the Internet and artificial intelligence, the demand for high-efficiency and high-power-density power supplies is increasing. In response to the increase in the required power, the existing method is to increase the bus voltage from 12V to 54V to reduce bus losses and reduce costs, and then add a bus converter to step down the bus voltage to 12V for power supply. [0003] In order to obtain higher system conversion efficiency, the following two schemes are mostly used in bus converters in the prior art for voltage conversion applications where the input is 40V to 60V and the output is 12V. Scheme 1 selects two magnetically integrated buck converters that are out of phase by 180 degrees to achieve output voltage regulation by adjusting the duty cycle. The circuit implementation ...
Claims
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IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0095H02M1/0064H02M3/1584H02M3/33569H02M7/53846H02M1/0003
Inventor金达熊雅红宿清华
OwnerDELTA ELECTRONICS INC