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Buck voltage balance converter

A voltage balance and converter technology, which is applied in the field of DC non-isolated conversion technology, can solve problems such as the inability to meet the input voltage requirements of the converter at the same time, and achieve the effect of easy implementation, simple circuit structure and control scheme

Inactive Publication Date: 2011-01-26
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a DC microgrid, two DC transmission lines are usually used to transmit electric energy, but due to the diversity of converters hanging on the DC transmission line (such as: half-bridge topology converters, full-bridge topology converters, etc. ), so two DC transmission lines are used in the DC micro-grid. Since there is only one DC voltage, it is usually impossible to meet the input voltage requirements of various converters at the same time.
For example, for half-bridge topology DC / AC inverters, a stable input midpoint voltage is required, which is equal to 1 / 2 of the input DC voltage, and it cannot be directly To obtain this stable midpoint voltage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1. refer to figure 1 . A step-down voltage balance converter, which includes a first step-down bridge arm circuit 1, an intermediate DC link circuit 2 and a second step-down bridge arm circuit 3;

[0030] The intermediate DC link circuit 2 includes: a first capacitor C 1 and a second capacitor C 2 , the first inductance L 1 and the second inductance L 2 , where the first capacitor C 1 One end and the second capacitor C 2 One end is connected in series, the series point is the first series point N, and the output neutral line L N , the first inductance L 1 and the second inductance L 2 One end of each is connected to the first series point N;

[0031] The first step-down bridge arm circuit 1 includes a first power switch tube S 1 and the first power diode D 1 , the first power switch S 1 source and the first power diode D 1 The cathode of the series is connected in series, and its series point is the second series point 4, the second series point 4...

Embodiment 2

[0033] Example 2. refer to Figure 2-5 . In the step-down voltage balance converter described in Embodiment 1, the first step-down bridge arm circuit 1 and the second step-down bridge arm circuit 3 both adopt fixed-frequency PWM control, and share a voltage loop regulator, and the voltage loop The output of the regulator directly controls the operation of the first step-down bridge arm circuit 1, and the output of the voltage loop regulator is inverted to directly control the operation of the second step-down bridge arm circuit 3. The breakdown is as follows:

[0034] 1. The first step-down bridge arm circuit 1 works.

[0035] When the first capacitor C 1 voltage greater than the second capacitor C 2 voltage, the first step-down bridge arm circuit 1 works, and the first capacitor C 1 on the energy to the second capacitor C 2 On transfer, the first capacitor C 1 voltage drops, the second capacitor C 2 The voltage rises to ensure that the voltages on the two capacitors ...

Embodiment 3

[0046] Example 3. refer to Figure 6-10 . The main simulation experiment done with the step-down voltage balance converter described in Example 1.

[0047] Simulation parameters in Figure 8: the operating frequency of the power switch tube is 50KHZ, the input voltage U in It is 360V DC and then superimposed on the sinusoidal AC with an amplitude of 10V / 1000Hz, the first inductance L 1 , the second inductance L 2 230uH respectively, the first capacitor C 1 , the second capacitance C 2 470uF respectively, the first capacitor C 1 Upper resistive load R load1 is 20Ω, the second capacitor C 2 Upper resistive load R laod2 is 30Ω, and at the moment of 80ms the second capacitor C 2 The upper resistive load Rlaod2 changes from 30Ω to 15Ω.

[0048] In Figure 8, the inductor current from the first i L1 , the second inductor current i L2 , the second capacitor voltage U C2 (U out2 ) and the relationship between the input voltage, it can be seen that during the input voltag...

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Abstract

The invention relates to a buck voltage balance converter. The converter is characterized by comprising a first buck bridge arm circuit, a middle direct current section circuit and a second buck bridge arm circuit; the middle direct current section circuit comprises a first capacitor C1 and a second capacitor C2, a first inductor L1 and a second inductor L2; the first buck bridge arm circuit comprises a first power switch tube S1 and a first power diode D1; and the second buck bridge arm circuit comprises a second power switch tube S2 and a second power diode D2. The buck voltage balance converter can solve the problem that in a direct current microgrid, the power transmission mode of two direct current transmission lines is converted into the power transmission mode of the three direct current transmission lines. Due to a serial structure of the two inductors, the direct connection problem of the two power switch tubes are avoided; and the whole circuit structure and a control proposal are respectively more simple and easy to realize and are applicable to distributed direct current power generating system of the direct current microgrid and application occasions needing stable midpoint voltage.

Description

technical field [0001] The invention relates to a step-down voltage balance converter, which belongs to the DC non-isolation conversion technology in electric energy conversion devices. Background technique [0002] At present, with the increasingly prominent environmental problems and the rapid development of power electronics and other technologies, the distributed power generation system based on DC Micro-Grid (such as solar energy, wind energy and other renewable energy) has gained more and more attention. more attention. In a DC microgrid, two DC transmission lines are usually used to transmit electric energy, but due to the diversity of converters hanging on the DC transmission line (such as: half-bridge topology converters, full-bridge topology converters, etc. ), so two DC transmission lines are used in the DC micro-grid. Since there is only one DC voltage, it is usually impossible to meet the input voltage requirements of various converters at the same time. For e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/135
Inventor 张先进范才红
Owner HUAIHAI INST OF TECH