TWI450466B - Applicable to a variety of power sources of intelligent energy storage system - Google Patents

Description

Smart energy storage system for multiple power sources

The invention relates to a technical field of electric energy storage, in particular to a smart electric energy storage system capable of charging various regenerative electric energy into a preset rechargeable battery by using a two-stage energy storage means and a lifting and lowering means.

As petrochemical energy is declining, various renewable (green) energy sources have become important alternative energy sources. Renewable energy sources include solar energy, thermal energy, wind energy, biomass energy, tidal energy, and vibrational energy, which often need to be converted into electrical energy to provide a wider range of applications. However, since the sources of various renewable energy sources are often in an unstable state, the use efficiency is poor and the power storage is not easy.

Furthermore, some micro-sized power generation devices, such as small-area dye-sensitized solar cells, generate less electrical energy and are difficult to use directly, so they are usually discarded; if the electrical energy generated by the micro-scale power generation device is to be stored It is also often used because it is not easy to be charged into the energy storage device or because the obtained electric energy is small, resulting in poor use efficiency, and the reuse of the small electric energy is discarded.

Taiwan Patent No. M336630 discloses a regenerative energy device having a piezoelectric element for converting pressure into electrical energy, which uses an piezoelectric element to generate an alternating current and rectifies it into a direct current and stores it in an energy storage element; the voltage of the energy storage element passes through a surge boosting device. And the fast diode, the energy is transferred to the power storage device to complete the conversion of the pressure into electrical energy.

Taiwan Patent No. I318033 discloses a high-efficiency energy storage and driving device that supplies a discontinuous pulse power source to charge and store an energy storage unit, or to drive a load; the energy storage and driving device includes a a switch, an energy device, an ultracapacitor and a switching control device, wherein the switching state of the switching switch is changed by using a switching signal of the switching control device to control the energy device to control the charging and discharging states of the ultracapacitor, and to store power The unit or load is charged to store or drive. Thereby, the electric energy loss in the energy conversion process such as wind power, water power and solar energy can be reduced, the energy utilization efficiency can be reduced by the weather factor, and the large current can be provided to improve the charging energy storage efficiency under the consideration of small system volume and cost. With the drive load.

Taiwan Patent No. I268035 discloses an energy storage circuit system including an energy storage component, a booster circuit for storing an input voltage to the energy storage component, and the boosting circuit for using a feedback voltage from the energy storage component Changing the switching frequency to adjust the input voltage; a comparison circuit for comparing a reference voltage with a voltage in the energy storage element to detect whether the voltage in the energy storage element reaches a preset value of a supply load and generates a control signal; and a charging circuit for supplying power to the load to return to the control signal when the voltage in the energy storage element reaches the preset value.

Taiwan Patent 200827549 discloses a small-scale wind-capacitor energy storage system, especially in the case of small wind conditions, using the low internal resistance energy storage characteristics of the supercapacitor to accumulate small electric energy accumulated by small winds into large energy, thereby driving the LED lamp or small Electrical machinery and equipment.

Taiwan Patent No. 591,847 discloses a regenerative energy converter device with a multi-function mode, comprising a monitoring unit, a boosting unit, a converter unit and an additional bidirectional charging unit; wherein the boosting unit is connected to the DC of the regenerative energy device The voltage output terminal is configured to boost the DC voltage outputted by the regenerative energy device into a high voltage direct current form through the boosting unit, and then input the high voltage direct current into the converter unit and the bidirectional charging unit. Since the monitoring unit is connected to the load, the converter unit and the bidirectional charging unit, different functional modes can be selected according to different loads, so that the converter unit can satisfy the application of different loads such as independent load or grid-connected load, and has high applicability.

Taiwan Patent No. 201014106 discloses a natural resource energy storage regeneration system and method thereof, which mainly comprises an electric energy generating device, a voltage stabilizing device, an output control unit, and an air pressure device having an air compressor and a gas storage tank, the electric energy generating device The natural resources such as light, wind or water can be converted into electric energy, and the converted electric energy is outputted with a stable voltage through a voltage stabilizing device, and then the output control unit controls the distribution of the output electric energy, and when the electric load device is connected, The electrical energy can be directly distributed and output to the electrical load device.

Taiwan Patent 201041271 discloses a solar energy storage system including a solar panel, a switching unit, a battery pack, a detecting unit, and a controller. The solar panel is used to convert solar energy into electrical energy. The switching unit is configured to switch the charging mode of the battery in the battery pack. The battery pack is used to store electrical energy. The detecting unit is configured to detect a charging voltage of the solar panel and an open circuit voltage of the battery pack. The controller is configured to perform charging according to a result of the detecting unit, and control the switching unit to switch to the corresponding charging connection line, and perform charging on the battery group in a corresponding charging manner.

Chinese patent 200910312812.9 discloses a solar energy storage system and a charging method thereof, which comprise a solar panel, a voltage current converter, a battery energy storage device and a control device. A voltage-to-current converter is used to convert the output voltage of the solar panel into a charging voltage of the battery energy storage device. The control device includes a detecting unit, a processing unit, and an execution unit. The detecting unit acquires the output voltage of the solar panel, the output voltage of the voltage-current converter, and the actual voltage of the battery energy storage device. The processing unit is configured to obtain, from the detecting unit, an output voltage of the solar panel and an actual voltage of the battery energy storage device, and the output voltage of the solar panel and a first predetermined voltage, and an actual voltage of the battery energy storage device and a second predetermined voltage. The comparison is separately performed to obtain a comparison result, wherein the first predetermined voltage is greater than the second predetermined voltage. The execution unit is connected to the voltage current converter, and the execution unit is configured to adjust the output voltage of the voltage current converter according to the comparison result to change the charging voltage of the battery energy storage device

In general, when the charging voltage is slightly larger than the rated voltage of the energy storage device, the power can be smoothly charged into the energy storage device without damaging the energy storage device; however, if the charging voltage is greater than the rated voltage of the energy storage device, Although it is also possible to charge electric power into the energy storage device, it is often caused by excessive voltage being applied to the energy storage device, which causes the energy storage device to be prone to material quality change or damage. On the other hand, if the voltage charged with the electric power is less than the rated voltage of the energy storage device, the charging electric power cannot charge the energy storage device.

The voltage and current generated by different renewable energy sources are not the same. Therefore, when the regenerative electric energy is stored, the voltage of the regenerative electric energy is greater than the rated voltage of the energy storage device, or the voltage of the regenerative electric energy is less than the rated voltage of the energy storage device. Both are not conducive to the storage of electrical energy. However, the above-mentioned various Taiwan patents have not taught how the energy storage device can be charged when the power voltage generated by the renewable energy source is different. Therefore, in order to actually use the above patent charging technology, most of the renewable energy source is selected as the power generation source. Instead of mixing different forms of renewable energy; even though Taiwan Patent 201014106 discloses that different renewable energy sources can be used, it only teaches the use of a voltage regulator to process regenerative power, and does not teach how to charge at different voltages.

The aforementioned Chinese patent is a solar energy storage system and method. Although the voltage comparison result is used to control the output voltage of the voltage-current converter, it is only adjusted for the voltage generated by the solar power generation. For other forms of renewable energy, In particular, the generation of renewable energy sources with small voltages does not explain how to use this technology for energy storage.

The object of the present invention is to provide an intelligent electric energy storage system suitable for a plurality of electric power sources, which has the ability to temporarily store the electric power generated by various renewable energy sources in a temporary storage device, and the electric energy can be output from the temporary storage device. After the voltage comparison and the buck-boost adjustment, an appropriate charging voltage is formed, and then the adjusted regenerative energy is charged into the preset energy storage device.

Another object of the present invention is to provide an intelligent electric energy storage system suitable for a plurality of power sources, which enables the electric energy storage system to recharge the regenerative electric energy without the need to match the mains or the existing electric components.

Specifically, the electric energy storage system of the present invention comprises a first energy storage device for temporarily storing regenerative electric energy; a second energy storage device having a rated voltage and for storing regenerative electric energy converted by voltage; a comparator Electrically connecting the first energy storage device; a reference voltage is set to the comparator and not less than the rated voltage of the second energy storage device; a voltage conversion module is electrically connected to the comparator and the second energy storage device; wherein the electrical energy is regenerated After the voltage is compared with the reference voltage by the comparator, the voltage is boosted or reduced by the voltage conversion module, and charged into the second energy storage device in a form higher than the rated voltage of the second energy storage device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of the preferred embodiments of the present invention in accordance with the purpose of the invention.

Referring to Figure 1, there is shown that the regenerative electrical energy 10 can enter the electrical energy storage system 20 and be stored in a predetermined device. The generation of the regenerative electric energy 10 includes general solar power generation, thermoelectric power conversion, wind power generation, piezoelectric transmission or small area dye-sensitized solar cells, etc. The electric energy storage system 20 can provide two-stage energy storage, voltage comparison and automatic buck-boosting. And other functions.

Specifically, the electrical energy storage system 20 has a first energy storage device 21 , and an adjustment module 22 is electrically connected to the first energy storage device 21 . The regenerative electric energy 10 is filtered or rectified and filtered by the adjustment module 22, and then charged into the first energy storage device 21. The first energy storage device 21 can be a capacitor, a variable capacitor, a super capacitor or a rechargeable battery, and the regenerative power 10 is temporarily stored in the first energy storage device 21 .

A comparator 23 is electrically connected to a switch 24, and the comparator 23 is additionally electrically connected to the first energy storage device 21.

A voltage conversion module 25 is electrically connected to the switch 24 and a second energy storage device 26; wherein the voltage conversion module 25 includes a boost converter 252 and a buck converter 254, and the switch 24 can be used by the path The transitions form a path with boost converter 252 or buck converter 254, respectively.

The second energy storage device 26 can be a variety of rechargeable batteries and has a nominal voltage.

Another reference voltage 27 can be set to the comparator 23, and the voltage value thereof can be adjusted to be equal to or greater than the rated voltage of the second energy storage device 26; in general, the reference voltage 27 can be adjusted to be the second energy storage device. The rated voltage of 26 is 1.2 times to 2.0 times, but not limited to this.

Additionally, the electrical energy storage system 20 can be coupled to a power device 30. The power unit 30 supplies power to the comparator 23 so that the comparator 23 can operate normally, and the reference voltage 27 can be set to the comparator 23.

The above is the composition of the electrical energy storage system 20 and its description, and the electrical energy storage system 20 can be applied in an environment with renewable energy.

In addition, the power device 30 can include the energy conversion component 32 electrically coupled to the electrical energy storage component 34. The energy conversion component 32 can be used to convert the renewable energy into electrical energy, and the electrical energy storage component 34 can be used to store the electrical energy converted by the energy conversion component 32. For example, the energy conversion component 32 can be a solar panel and the electrical energy storage component 34 can be a capacitor; in addition, the electrical device 30 can be a conventional battery.

The source of regenerative electrical energy disclosed by the present invention may be solar power generation; in particular, a stacked solar power generation architecture may be utilized to generate electrical energy.

Referring to FIG. 2 , the stacked solar power generation structure 40 includes a first solar panel 41 and a second solar panel 42 , and a reflective sheet 43 is combined with the first solar panel 41 , and a concentrating sheet 44 is combined with the second solar panel . 42; a light guide plate 45 is located between the reflection sheet 43 and the condensing sheet 44, and the light guide plate 45, the reflection sheet 43 and the condensing sheet 44 are brought into a combined state.

Referring to FIG. 3, the source of the regenerative electrical energy disclosed by the present invention may be piezoelectric transduction, and the specific architecture thereof includes at least one set of piezoelectric modules 50. The piezoelectric module 50 is formed by stacking a piezoelectric element 51 and a rubber cushion 52.

Referring to FIG. 4, the source of the regenerative electric energy disclosed by the present invention may be thermoelectric power. Taking the LED street lamp 60 as an example, a combination of the graphite sheets 62, 63 and the thermoelectric wafer 64 can be disposed on the heat sink 61, so that the heat radiated by the LED 65 can be converted into electric energy by the thermoelectric chip 64.

Referring to FIG. 5, the source of regenerative electrical energy disclosed by the present invention may be a small area dye-sensitized solar cell architecture 70 comprising a light source 71 and at least one dye-sensitized solar cell 72. The dye-sensitized solar cell 72 can be irradiated with a light source 71 to generate electric energy.

Generally, regenerative electric power can generate alternating current or direct current electric energy according to its source, for example, piezoelectric electric power is converted into alternating current electric power, and electric power generated by solar power generation, thermoelectric power conversion and dye-sensitized solar cells is direct current; and each kind of regenerative electric power The voltage and current intensities are not the same, and their relative comparison values are divided into: (1) large voltage, large current, such as solar power generation, which can generate 29.4 volts (V), 5 in the description of the present invention. Milliamperes (mA) of electricity; (2) large voltage, small current, such as piezoelectric transfer, which can generate 46 volts (V), 116.5 microamperes (μA) of electricity; (3) small voltage, high current, Such as thermoelectric power, it can produce 1.1 volts (V), 58.5 milliamperes (mA) of electricity; (4) small voltage, small current, such as small area dye-sensitized solar cells, which can produce 1 volt (V), 3.3 milliamperes (mA) of electricity. However, the values of the large voltage, small voltage, large current, and small current referred to above are not academically defined.

Referring to FIG. 6, the present invention is applicable to regenerative electric energy being DC power or AC power, wherein the DC power source can be filtered by the filtering of the adjustment module 22 to form a stable DC current; and the AC power source is adjusted by the module. The bridge rectifier and filter capacitor of 22 are rectified and filtered to form a stable DC current.

The DC current outputted by the self-adjusting module 22 can be temporarily stored in the first energy storage device 21, thereby becoming the first stage of energy storage.

The power device 30 provides sufficient voltage as the reference voltage 27 and provides sufficient power to drive the comparator 23. The voltage value of the reference voltage 27 is adjusted with reference to the rated voltage of the second energy storage device 26. The voltage adjustment value of the reference voltage 27 can be achieved by matching the voltage regulation of the diode 272 with the variable resistor 274.

Therefore, the voltage of the regenerative electric energy outputted from the first energy storage device 21 is compared with the reference voltage 27, and if the regenerative electric energy voltage is less than the reference voltage 27, the comparator 23 outputs a low potential signal so that the switch in the switch 24 is switched. (NMOS Q1) 242 forms an open circuit, and the other switch (PMOS Q2) 244 forms a path, so that the regenerative electric energy outputted by the first energy storage device 21 can enter the boost converter 252 of the voltage conversion module 25 to increase the voltage. The second energy storage device 26 is then charged under appropriate voltage conditions.

If the voltage of the regenerative electric energy outputted from the first energy storage device 21 is compared with the reference voltage 27, and the regenerative electric energy voltage is greater than the reference voltage 27, the comparator 23 outputs a high potential signal so that the switch in the switch 24 (NMOS) Q1) 242 forms a path, and the other switch (PMOS Q2) 244 forms an open circuit, so that the regenerative electric energy outputted by the first energy storage device 21 can enter the buck converter 254 of the voltage conversion module 25 to lower the voltage, and then The appropriate voltage conditions are charged to the second energy storage device 26 such that a second stage of energy storage is formed.

In general, the power voltage output from the voltage conversion module 25 is generally 1.2 to 2.0 times the rated voltage of the second energy storage device 26.

A further power detector 74 is electrically connected to the second energy storage device 26 for detecting the amount of charge of the second energy storage device 26.

The electrical energy storage system disclosed by the present invention has the following functions: (1) using a two-stage energy storage design, so that the electrical energy storage system can be applied to different power sources, especially a small power source, such as the small area disclosed in the embodiment. Dye-sensitized solar cells (small voltage, small current) can also obtain effective storage and application, which can improve the recycling rate of renewable energy; (2) Switching off and the comparator and reference voltage to form a smart switch The device is designed to automatically switch the power source to the desired boost converter or buck converter after detecting the voltage of the regenerative power, so that the operation is quite simple; (3) The second energy storage device can use various types of rechargeable batteries currently known, and can be charged according to the foregoing description by appropriately adjusting the reference voltage during charging, so that the present invention has broad applicability; (4) electrical energy storage. The system can be portable, so it can be applied indoors or outdoors with renewable energy generation conditions, and the power device can be another advantage. Electric power regeneration means, so that the present invention can be used completely without electricity resources, thereby achieving efficient energy storage and energy saving effect.

The above is a preferred embodiment and the design of the present invention. The preferred embodiments and the drawings are merely illustrative and not intended to limit the scope of the invention. The scope of the rights covered by the content of the "Scope of Patent Application" is not within the scope of the invention and is the scope of the applicant's rights.

10‧‧‧Renewable energy

20‧‧‧Electric energy storage system

21‧‧‧First energy storage device

22‧‧‧Adjustment module

23‧‧‧ Comparator

24‧‧‧Toggle switch

242‧‧‧Switch (NMOS Q1)

244‧‧‧Switch (PMOS Q2)

25‧‧‧Voltage conversion module

252‧‧‧Boost Converter

254‧‧‧Buck Converter

26‧‧‧Second energy storage device

27‧‧‧Reference voltage

272‧‧‧Jenner diode

274‧‧‧Variable resistor

30‧‧‧Power installations

32‧‧‧Energy conversion components

34‧‧‧Electric energy storage component

40‧‧‧Stacked solar power architecture

41‧‧‧First solar panel

42‧‧‧Second solar panels

43‧‧‧reflector

44‧‧‧ concentrator

45‧‧‧Light guide plate

50‧‧‧ Piezoelectric module

51‧‧‧Piezoelectric components

52‧‧‧Rubber cushion

60‧‧‧LED street light

61‧‧‧ Heat sink

62‧‧‧Graphite sheet

63‧‧‧graphs

64‧‧‧Thermal chip

65‧‧‧LED

70‧‧‧Small area dye-sensitized solar cell architecture

71‧‧‧Light source

72‧‧‧Dye-sensitized solar cells

74‧‧‧Power Detector

1 is a block diagram of the present invention; FIG. 2 is a schematic diagram of a stacked solar power generation architecture of the present invention; FIG. 3 is a schematic diagram of a piezoelectric power transmission architecture of the present invention; and FIG. 4 is a thermoelectric conversion architecture of the present invention. schematic diagram; Fig. 5 is a schematic view showing the structure of a small area dye-sensitized solar cell of the present invention; and Fig. 6 is a circuit diagram of the present invention.

10. . . Regenerative energy

20. . . Electrical energy storage system

twenty one. . . First energy storage device

twenty two. . . Adjustment module

twenty three. . . Comparators

twenty four. . . Toggle switch

25. . . Voltage conversion module

252. . . Boost converter

254. . . Buck converter

26. . . Second energy storage device

27. . . Reference voltage

30. . . Power device

32. . . Energy conversion component

34. . . Energy storage component

Claims (10)

An intelligent electric energy storage system suitable for a plurality of electric power sources for storing regenerative electric energy generated by a regenerative energy, comprising: a first energy storage device for temporarily storing the regenerative electric energy; and a second energy storage device And having a rated voltage for storing the regenerative electrical energy converted by the voltage; a comparator electrically connected to the first energy storage device; a reference voltage set to the comparator and not less than the second energy storage a rated voltage of the device; a voltage conversion module electrically connected to the comparator and the second energy storage device; wherein a voltage of the regenerative electric energy output from the first energy storage device is compared with the reference voltage via the comparator Then, the voltage conversion module raises the voltage or lowers the voltage so that the regenerative electric energy can be charged into the second energy storage device. The smart energy storage system for a plurality of power sources, as described in claim 1, further comprising a switch, the switch is electrically connected to the comparator and the voltage conversion module, and the regenerative energy is switched by the switch After the switch, enter the voltage conversion module to automatically raise or lower the voltage. The intelligent electric energy storage system applicable to a plurality of electric power sources, as described in claim 1 or 2, wherein the voltage conversion module comprises a boost converter and a buck converter. The intelligent electric energy storage system applicable to a plurality of electric power sources, as described in claim 1, wherein the first energy storage device may be selected from a capacitor, a variable capacitor, a super capacitor or a rechargeable battery. The intelligent electric energy storage system applicable to a plurality of electric power sources, as described in claim 1, wherein the second energy storage device is a rechargeable battery. An intelligent electric energy storage system suitable for a plurality of power sources, as described in claim 1, further comprising a power device electrically connected to the comparator and providing power and the reference voltage to the comparator, such that The comparator works fine. An intelligent electric energy storage system suitable for a plurality of electric power sources, as described in claim 6, wherein the electric power device comprises an energy conversion component electrically connected to an electrical energy storage component. An intelligent electric energy storage system suitable for a plurality of electric power sources, as described in claim 6, wherein the electric device is a battery. The smart energy storage system for a plurality of power sources, as described in claim 1, further comprising an adjustment module electrically connected to the first energy storage device, and the adjustment module is After the regenerative electric energy is filtered or rectified and filtered, the adjusted regenerative electric power is stored in the first energy storage device. For example, the smart energy storage system applicable to a plurality of power sources, as described in claim 1, further includes a power detector, and the power detector is electrically connected to the second energy storage device.