Switch staggered type DC-DC converter
A DC-DC and converter technology, applied in the field of DC conversion circuit, can solve the problems of increasing overall size and weight, increasing cost, etc., and achieve the effects of improving service life, reducing system size, and reducing input current ripple
Inactive Publication Date: 2018-04-24
北京科诺伟业科技股份有限公司
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Problems solved by technology
The existing interleaved DC-DC converter uses two inductors, which increases the overall size and weight, and increases the cost
Method used
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0026] Such as figure 2 As shown, the present invention uses a single inductance as the inductance of the switch-type interleaved DC-DC converter, and adopts 4 switching devices SW1, SW2, SW3, SW4, and the 4 switching devices are connected in parallel in pairs. The first switching device SW1 and the second switching device SW2 are connected in parallel to form the first group of switching devices, and the third switching device SW3 and the fourth switching device SW4 are connected in parallel to form the second group of switching devices. The anode of the input voltage terminal Vin of the converter of the present invention is connected to one end of the inductance L1, and the other end of the inductance L1 is connected to the first switching device SW1 and the second switching device SW2 connected in parallel, and the first switching device SW...
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The invention discloses a switch staggered type DC-DC converter. The switch staggered type DC-DC converter comprises a first switching device SW1, a second switching device SW2, a third switching device SW3 and a fourth switching device SW4, wherein the first switching device SW1 and the second switching device SW2 are connected in parallel, and the third switching device SW3 and the fourth switching device SW4 are connected in parallel; a positive electrode of an input voltage end Vin of the converter is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the first switching device SW1 and the second switching device SW2 which are connected in parallel, and the other end of the first switching device SW1 and the second switching device SW2 which are connected in parallel is connected with a negative electrode of the input voltage end Vin; the parallelly-connected first switching device SW1 and second switching device SW2 are further connected in series with a parallel branch circuit of the third switching device SW3 and the fourth switching device SW4; the other end of the parallel branch circuit of the third switching device SW3 and the fourth switching device SW4 is connected with a positive electrode of an output voltage end Vout of the converter; and a filtering capacitor C is connected in parallel between the positive and negativeelectrodes of the output voltage end Vout. The switch staggered type DC-DC converter divides a time period of PWM into two groups and controls two switching devices, thus frequencies of current and voltage passing through the inductor and the capacitor are doubled while ripple values of the current and voltage are reduced by half under the condition that the PWM frequency is constant.
Description
technical field [0001] The invention relates to a DC conversion circuit. Background technique [0002] The battery charging and discharging DC / DC converter connected with the energy storage device plays the most important role in the microgrid system. On the one hand, the charge / discharge operation is performed in the maximum power conversion stage, and the power conversion loss is very large. On the other hand, the battery charging and discharging DC / DC converter is directly connected to the DC power distribution system. Therefore, it is necessary to study how to reduce the ripple of the output voltage and reduce the initial investment cost. [0003] figure 1 Shown is an existing interleaved DC-DC converter. Its topology uses two inductors, and the switching tube control method is 180-degree angle staggered opening method. Figure 5 Shown is the voltage ripple of the existing interleaved DC-DC converter, in the case of constant PWM frequency, Image 6 Because of the v...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M3/158H02M1/14H02M3/07
CPCH02M1/14H02M3/073H02M3/1584H02M3/1586
Inventor 周宇许洪华
Owner 北京科诺伟业科技股份有限公司