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Energy transfer type super capacitor voltage equalization circuit

A voltage equalization circuit and supercapacitor technology, applied in the electrical field, can solve the problems of resistance consumption, long voltage equalization time, slow equalization speed, etc., and achieve the effects of eliminating energy loss, shortening voltage equalization time, and fast equalization speed

Active Publication Date: 2015-03-25
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] This method has simple circuit, low cost, convenient control and high reliability, and the bypass resistance can be set according to the charging current. The control is obviously more flexible than the parallel voltage regulator method, but there is still energy loss and the heat generated by the resistance is large. , the disadvantages of long equalization time
[0010] To sum up, although the existing voltage equalization scheme has the characteristics of simple circuit, convenient control, and low cost, it uses resistance to consume excess energy for voltage equalization. The state of current charging and discharging will generate large loss and heat; and the existing method is slow to equalize, which is not conducive to the large-scale integration and high-power application of supercapacitors

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  • Energy transfer type super capacitor voltage equalization circuit
  • Energy transfer type super capacitor voltage equalization circuit
  • Energy transfer type super capacitor voltage equalization circuit

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Experimental program
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Effect test

specific Embodiment 1

[0045] by Figure 4 The circuit diagram shown is implemented, and the initial voltage of each capacitor is set to 0V; the inductance in the circuit is set to 10μH, and the pulse frequency of the switching tube is set to 2000Hz.

[0046] Real-time measurement of the voltage waveform at both ends of the capacitor, the waveform is shown in Figure 6 shown.

[0047] It can be seen from the waveform diagram that although the capacitance of each capacitor varies greatly, under the action of the voltage equalizing device, the terminal voltage curves of the four supercapacitors almost overlap when charging, and reach their rated voltage of 3V at the same time at 39s, and It has been stable at this value, which proves the good performance of the voltage equalization circuit. If no voltage equalization measures are added, theoretically when C1 is fully charged (voltage reaches 3V), the terminal voltage of C4 is only 3×1000 / 1600=1.875V.

specific Embodiment 2

[0048] Still carry out the implementation with the above circuit structure. Before charging, charge the 4 supercapacitors in advance to have different initial voltages. The initial voltages of the 4 capacitors are: UC1=0V, UC2=1V, UC3=1.5V, UC4=2.5V, the inductance of the DC / DC converter is still set to 10μH, the pulse frequency of the switching tube is set to 2000Hz, and the voltage waveform at both ends of the capacitor is measured in real time. The waveform is shown in Figure 7 shown.

[0049] It can be seen from the waveform diagram that even under the condition that the initial voltages and capacities of each monomer are very different, the effect of voltage equalization can still be achieved quickly under the action of the voltage equalization device, which proves that the circuit has a good equalization pressure characteristics.

specific Embodiment 3

[0050] The implementation is still carried out with the above-mentioned 4 supercapacitors in series, and the charging power supply is replaced by a discharging resistor. The circuit structure is as follows Figure 5 shown. The resistance is set to 0.02Ω to verify its voltage-balancing characteristics during discharge.

[0051] Charge the 4 supercapacitors in advance to make them have different initial voltages. The initial voltages of the 4 capacitors are: UC1=2V, UC2=2.2V, UC3=2.5V, UC4=3V. Real-time measurement of the voltage waveform, see the waveform Figure 8 shown.

[0052] It can be seen from the waveform diagram that even when the initial voltage of each cell is very different and the capacity is different, the voltage of each cell can quickly reach a balanced effect during the discharge process.

[0053] It can be seen from the above specific implementation cases that the voltage equalizing circuit described in the present invention has basically no energy loss, hi...

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Abstract

The invention provides an energy transfer type super capacitor voltage equalization circuit. A power electronics conversion circuit is connected between every two adjacent super capacitor single bodies, the turn-on and turn-off of switching tubes connected with all the super capacitor single bodies in parallel are controlled by collecting and comparing the voltages of the super capacitor single bodies so that energy can be transmitted between every two adjacent capacitors through inductors, and finally the energy in the high-voltage super capacitor single bodies is transferred into the low-voltage super capacitor single bodies through the power electronics conversion circuits. The circuit is high in voltage equalization efficiency, basically free of loss, high in equalization speed and capable of conducting voltage equalization both in the charging process and the discharging process.

Description

technical field [0001] The invention belongs to the electrical field and relates to an energy transfer type supercapacitor voltage equalization circuit. Background technique [0002] As a new type of green energy storage device, supercapacitor has the advantages of high power density, fast charging speed, large charging and discharging current, long cycle life, no pollution to the environment, and high energy conversion efficiency. It is used in new energy vehicles, distributed power grids, It has broad application prospects in power quality regulation, industrial energy saving, military industry, backup power supply and other fields. However, since the stored energy of a single supercapacitor is limited and the operating voltage is not high, generally not exceeding 3V, it is often necessary to use multiple supercapacitors in series and parallel in practical applications. After the supercapacitors are connected in series, during the charging (discharging) process, due to th...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0018H02J2207/20
Inventor 闫新育刘水平董海健
Owner CHINA XD ELECTRIC CO LTD