Cycle power storage circuit

Abstract

This invention proposes a cyclic energy storage circuit, comprising a dual power switching circuit, an inverter circuit, a feedback circuit, a rectifier circuit, a charging circuit, and an intelligent control circuit. This invention converts a first AC power into potential or kinetic energy coupled to an energy storage device via a starting motor, and obtains a second AC power converted from potential or kinetic energy via a generator motor coupled to the energy storage device. This invention utilizes the above structure to cyclically store energy between the energy storage device and its external environment, replacing expensive and frequently maintained battery or chemical energy storage systems.

Description

Technical Field

[0001] This invention relates to a circuit design, and more particularly to a circulating power storage circuit. Prior Technology

[0002] In recent years, environmental changes caused by climate change have profoundly impacted all aspects of people's lives. Climate change is primarily caused by greenhouse gas emissions, especially gases such as carbon dioxide (CO2) and methane (CH4), which originate from human activities such as burning fossil fuels, industrial activities, and agriculture. Climate change leads to extreme weather, sea-level rise, and changes in ecosystems, posing threats to the global economy and human health. One strategy for addressing climate change is to reduce carbon emissions, which has driven the development of clean energy. Clean energy refers to renewable energy sources with low or zero carbon emissions, such as solar, wind, hydropower, and geothermal energy. These energy sources help reduce dependence on fossil fuels, thereby reducing greenhouse gas emissions. However, clean energy is intermittent and unstable (for example, solar energy can only generate electricity during the day, and wind energy depends on wind speed). Effective energy storage technologies are needed to make clean energy a stable energy supply source.

[0003] Energy storage technology can store electrical energy converted from clean energy or other traditional power generation sources for later use, thereby solving the problem of supply and demand imbalance. For example, electricity can be stored when there is a surplus of solar or wind power, and released during peak energy demand periods or when power generation is unavailable. Currently mature energy storage technologies include battery storage, supercapacitor storage, and compressed air storage. The components used in these technologies are characterized by high cost, the need for regular maintenance, and large size. While large power-consuming devices may be able to utilize these technologies, smaller or less cost-effective devices still rely on a stable power source. To meet the demand for low-cost, long-term maintenance-free energy storage, flywheel energy storage and pumped hydro storage are mature and feasible solutions. Taking a flywheel as an example, it can convert external electricity (such as from a motor) into its own kinetic energy for storage, and then convert that kinetic energy into electrical energy when needed. The flywheel's structure is not complex, but its kinetic energy is gradually consumed due to internal friction. However, its rotational speed can be appropriately increased to replenish the consumed kinetic energy and prevent the depletion of reserve energy. This type of architecture, which uses flywheels or water tanks to store and release energy, typically requires the cooperation of motors and generators to convert the stored energy between kinetic or potential energy and electrical energy. Appropriate power management technologies are needed to achieve this. Summary of the Invention

[0004] This paragraph extracts and summarizes certain features of the invention. Other features will be disclosed in subsequent paragraphs. Its purpose is to cover various modifications and similar arrangements within the spirit and scope of the additional claims.

[0005] To achieve the above objectives, this invention discloses a novel circulating power storage circuit. This circuit converts a first AC power into potential or kinetic energy of a coupled energy storage device via a starter motor, and obtains a second AC power converted from potential or kinetic energy via a generator motor coupled to the energy storage device. The circuit comprises: a dual-power switching circuit electrically connected to two DC power sources and outputting a first DC power from the DC power source with the larger voltage, one of which is a secondary battery module; an inverter circuit electrically connected to the dual-power switching circuit and the starter motor, enabling the conversion of the first DC power into the first AC power and supplying it to the starter motor; and a feedback circuit electrically connected to the inverter circuit, which, based on a comparison between the voltage value of the second AC power after rectification to DC power and a set voltage value, sends a feedback signal to the inverter circuit to control the inverter circuit to change the waveform of the first AC power. A rectifier circuit, serving as the other DC power source for the dual-power switching circuit, is enabled to convert the received second AC power into a first DC power with a voltage greater than the output voltage of the secondary battery module; a charging circuit, electrically connected to the secondary battery module, is enabled to convert the received second AC power into a second DC power to charge the secondary battery module; and an intelligent control circuit, electrically connected to the output terminal of the generator motor, the inverter circuit, the feedback circuit, the rectifier circuit, and the charging circuit, performs the following operations: providing the second AC power to the feedback circuit; and comparing the voltage value of the second AC power after rectification to DC power with the set voltage value; if the former is smaller, enabling the inverter circuit and shutting down the rectifier circuit and the charging circuit; if the former is larger, shutting down the inverter circuit and enabling the rectifier circuit and the charging circuit.

[0006] According to the present invention, the energy storage device may be a flywheel or a device that uses varying water levels to store or release energy.

[0007] According to the present invention, the dual power switching circuit can be formed by two diodes connected in series. The secondary battery module is electrically connected to the anode of a first diode, the rectifier circuit is electrically connected to the electrical connection line of the diodes, and the inverter circuit is electrically connected to the cathode of a second diode.

[0008] According to the present invention, the inverter circuit may further include: a waveform generation unit that generates a corresponding pulse width modulation signal according to the received feedback signal; a first switching unit that is electrically connected to the intelligent control circuit and controlled by the intelligent control circuit to be turned on or off; and an AC power generation unit that is electrically connected to the output terminal of the dual power supply switching circuit through the first switching unit and signal-connected to the waveform generation unit. When the first switch is turned on, the first DC power is converted into the first AC power, and the waveform of the first AC power is adjusted based on the pulse width modulation signal.

[0009] According to the present invention, the feedback circuit may further include: a first half-wave rectifier unit electrically connected to the intelligent control circuit, which rectifies the second AC power from the intelligent control circuit into DC power; and an optocoupler unit electrically connected to the first half-wave rectifier unit and the inverter circuit, which generates a corresponding voltage as a feedback signal based on the ratio between the DC voltage value and the set voltage value, and transmits it to the inverter circuit.

[0010] According to the present invention, the rectifier circuit may further include: a voltage adjustment unit electrically connected to the intelligent control circuit, adjusting the second AC power from the intelligent control circuit so that the peak voltage of the adjusted second AC power is greater than the voltage value of the output voltage of the secondary battery module; and a rectifier unit electrically connected to the voltage adjustment unit and the dual power supply switching circuit, converting the adjusted second AC power into DC power and outputting it. Preferably, the rectifier unit is a full-wave rectifier circuit or a half-wave rectifier circuit.

[0011] According to the present invention, the charging circuit may further include: an AC-DC conversion unit electrically connected to the intelligent control circuit, for converting the second AC power from the intelligent control circuit into the second DC power capable of charging the secondary battery module; a current detection unit electrically connected to the secondary battery module to detect the output current value of the secondary battery module; a voltage adjustment unit signal-connected to the AC-DC conversion unit for fine-tuning the voltage of the second DC power; and a charging mode control unit signal-connected to the current detection unit, for adjusting the output current value based on the change over time. To generate an output control signal, the output control signal including the output voltage value and the current quantity; and a charging control unit, electrically connected to the AC-DC conversion unit and the secondary battery module, and signal-connected to the voltage adjustment unit and the charging mode control unit, performing the following operations: receiving the output control signal; controlling the voltage adjustment unit according to the output control signal to maintain the voltage value of the second DC power at the same level as the voltage value in the output control signal; and adjusting the current quantity of the second DC power to be the same as the current quantity in the output control signal, and outputting the second DC power.

[0012] According to the present invention, the intelligent control circuit may further include: an electrical connection unit electrically connected to the output terminal of the generator motor and the feedback circuit, so as to directly output a portion of the second AC power from the output terminal to the feedback circuit; a second half-wave rectifier unit electrically connected to the output terminal, which rectifies the second AC power into DC power; a second switching unit electrically connected to the inverter circuit and the output terminal, which is controlled to turn the circuit between the inverter circuit and the output terminal on or off; and a third switching unit electrically connected to the rectifier circuit and the output terminal, which is controlled to turn the circuit between the rectifier circuit and the output terminal on or off. The circuit includes: a fourth switching unit electrically connected to the charging circuit and the output terminal, controlled to open or close the circuit between the charging circuit and the output terminal; and a comparator unit electrically connected to the second half-wave rectifier unit, the second switching unit, the third switching unit, and the fourth switching unit at the output terminal of the generator motor, comparing the voltage value of the DC current from the second half-wave rectifier unit with the set voltage value. If the former is smaller, the second switching unit is opened and the third and fourth switching units are closed; if the former is larger, the second switching unit is closed and the third and fourth switching units are opened.

[0013] This invention utilizes the aforementioned structure to cyclically store energy within the energy storage device and its external environment, replacing expensive and frequently maintained batteries or chemical energy storage systems. The secondary battery module does not need to have a large capacity, and its output can be replenished by external energy received by the energy storage device. Without energy loss during the energy storage device's cycle, its stored energy can be available for extended periods to meet unforeseen needs. Simple Explanation of the Diagram

[0014] Figure 1 is a component block diagram of a circulating power storage circuit and its application architecture according to an embodiment of the present invention.

[0015] Figure 2 illustrates a schematic diagram of the structure of the device used in the embodiment to store or release energy by varying the water level of the stored water.

[0016] Figure 3 is a block diagram of an inverter circuit and its electrical connection components in the circulating power storage circuit.

[0017] Figure 4 is a block diagram of a feedback circuit and its electrical connection components in the circulating power storage circuit.

[0018] Figure 5 is a block diagram of a rectifier circuit and its electrical connection components in the circulating power storage circuit.

[0019] Figure 6 is a block diagram of a charging circuit and its electrical connection components in the circulating power storage circuit.

[0020] Figure 7 is a block diagram of an intelligent charging circuit and its electrical connection components in the circulating power storage circuit.

[0021] Figure 8 is a timing comparison diagram of the peak voltage change of the first AC power output of the inverter circuit and the peak voltage change of the second AC power output of the generator motor. Implementation

[0022] The present invention will be described in more detail with reference to the following embodiments.

[0023] Please refer to Figure 1, which is a component block diagram of a circulating power storage circuit 1 and its application architecture according to an embodiment of the present invention. The circulating power storage circuit 1 (components are shown in dotted dashed boxes) is electrically connected to a set of power storage systems 2 (components are shown in dashed boxes) and a secondary battery module 3. Power from the secondary battery module 3 is input into the power storage system 2, then withdrawn from the power storage system 2, and "circulated" back into the power storage system 2, maintaining a gradual decrease in the power within the power storage system 2. When the power level drops to a certain level (due to consumption by internal or external loads), the secondary battery module 3 is activated to charge the power storage system 2. Further explanation: the power storage system 2 is basically composed of a starter motor 2A, an energy storage device 2B, and a generator motor 2C. The circulating power storage circuit 1 converts a first AC power into potential or kinetic energy of the coupled energy storage device 2B through the starter motor 2A, and obtains a second AC power converted from potential or kinetic energy through the generator motor 2C coupled to the energy storage device 2B. Clearly, the energy storage system 2 is not a traditional rechargeable battery energy storage system or a chemical energy storage system, but a physical energy storage device. In this embodiment, the energy storage device 2B is a flywheel; in practice, the energy storage device 2B can be a device that uses changes in the water level to store or release energy (hereinafter referred to as a hydraulic energy storage device).

[0024] The flywheel stores external energy by rotating due to its large mass. Various types of hydroelectric energy storage devices can be used. See Figure 2, which is a schematic diagram illustrating the structure of the hydroelectric energy storage device used in the embodiment. The hydroelectric energy storage device consists of an outer casing 2B1, a water storage tank 2B2 installed inside the outer casing 2B1, and an Archimedes screw pump 2B3. The rotor of the starter motor 2A extends into the outer casing 2B1 and is rotatably coupled to the Archimedes screw pump 2B3, thereby pumping water (indicated by fine dots) from the outer casing 2B1 into the water storage tank 2B2, raising its water level. On the other side, the rotating blades 2C1 of the generator motor 2C are disposed inside the outer casing 2B1 and coupled to the generator rotor of the generator motor 2C extending into the outer casing 2B1. An internal water outlet 2B21 is opened on the side of the water storage tank 2B2. Water inside the water storage tank 2B2 leaks out through the internal water outlet 2B21. Rotating the rotating blade 2C1 causes the generator motor 2C to generate and output a second AC power. In this way, the energy from the secondary battery module 3 effectively increases the total potential energy of the water inside the water storage tank 2B2. The power returning from the generator motor 2C to the circulating power storage circuit 1 will then circulate back to the starter motor 2A, maintaining the energy in a repeated cycle between the starter motor 2A, the energy storage device 2B (hydraulic energy storage device), and the generator motor 2C, until it falls below a set level, at which point the secondary battery module 3 will replenish it.

[0025] The energy storage device 2B used in this invention has a special design: it can absorb external energy to replenish dissipated energy. For example, a water inlet 2B11 can be opened on the top of the outer casing 2B1 of the hydroelectric energy storage device in Figure 2, and an outlet 2B12 can be opened on the side. The energy storage system 2 can be placed in an open field or where a mountain spring flows. The water inlet 2B11 can introduce rainwater or mountain spring water into the water storage tank 2B2, which is equivalent to adding the potential energy of water to the energy storage system 2 from outside the system. Excess water can be discharged from the hydroelectric energy storage device through the outlet 2B12. The difference between this invention, which combines the energy storage device 2B, and directly using rainwater or mountain spring water to generate electricity is that the latter's water source stability is insufficient, and it cannot effectively store energy. Similarly, if the energy storage device 2B is a flywheel, the flywheel can also be combined with coaxial fan blades or use a speed-increasing device to obtain wind energy from external wind. In this way, the energy storage system 2 can always retain a certain amount of energy (electrical energy) to supply unforeseen needs without the need for complex, expensive, and polluting lithium or lead-acid batteries. The cyclic energy storage circuit 1 of this invention is a novel design that specifically realizes the cyclic conversion and storage of energy.

[0026] Please refer to Figure 1. The structure of the circulating power storage circuit 1 includes a dual power switching circuit 10, an inverter circuit 20, a feedback circuit 30, a rectifier circuit 40, a charging circuit 50, and an intelligent control circuit 60.

[0027] The dual-power switching circuit 10 is electrically connected to two DC power sources and outputs a first DC power from the DC power source with a higher voltage. One DC power source is a secondary battery module 3, and the other DC power source is a rectifier circuit 40. For ease of explanation, the first DC power refers to the DC power entering the inverter circuit 20, regardless of whether it is supplied by the secondary battery module 3 or the rectifier circuit 40. According to the present invention, the dual-power switching circuit 10 is formed by two diodes (a first diode 11 and a second diode 12) connected in series. The secondary battery module 3 is electrically connected to the anode of the first diode 11, the rectifier circuit 40 is electrically connected to the electrical connection lines of these diodes, and the inverter circuit 20 is electrically connected to the cathode of the second diode 12. This is a simple and ingenious single-loop dual-power architecture. As can be seen from Figure 1, the DC power from both the rectifier circuit 40 and the secondary battery module 3 can only flow to the inverter circuit 20. This invention ensures that when the secondary battery module 3 is connected to the inverter circuit 20 via the dual power supply switching circuit 10, the rectifier circuit 40 has a zero potential; when the rectifier circuit 40 is connected to the inverter circuit 20 via the dual power supply switching circuit 10, its output voltage is slightly higher than the output voltage of the secondary battery module 3. Due to the reverse bias of the first diode 11, the secondary battery module 3 is technically unable to supply power. Therefore, in practice, either the rectifier circuit 40 or the secondary battery module 3 has a larger output voltage, which can supply power to the inverter circuit 20.

[0028] The inverter circuit 20 is electrically connected to the dual power switching circuit 20, the feedback circuit 30, the intelligent control circuit 60, and the starter motor 2A. It is controlled by the intelligent control circuit 60, enabling it to convert the received first DC power into first AC power and supply it to the starter motor 2A. Otherwise, the inverter circuit 20 does not operate, and the circulating power storage circuit 1 is also in a shutdown state. See Figure 3, which is a block diagram of the inverter circuit 20 and its electrically connected components in the circulating power storage circuit 1. To achieve the design purpose of the inverter circuit 20, it may include a waveform generation unit 21, a first switching unit 22, and an AC power generation unit 23. The waveform generation unit 21 can be a combination of a chip that generates a periodic signal (pulse width modulation signal) to control the switching output voltage of the AC power generation unit 23 and a passive component for the required input / output control. It can generate a corresponding pulse width modulation signal for the AC power generation unit 23 based on the feedback signal received from the feedback circuit 30. The first switching unit 22 can be a relay controller or a transistor, which controls whether the circuit between the dual power supply switching circuit 10 and the AC power generation unit 23 is connected. The first switching unit 22 is electrically connected to the intelligent control circuit 60 and is controlled by the intelligent control circuit 60 to turn on or off. The output terminal of the AC power generation unit 23 and the dual power supply switching circuit 10 is electrically connected through the first switching unit 22 and is signal connected to the waveform generation unit 21. To distinguish between signal connection and electrical connection, signal connection between components is represented by dashed lines, and electrical connection is represented by dashed lines. Signal connection is also a type of electrical connection, except that the voltage change carries an instruction or encoded signal to control the operation of the receiving end. The AC power generation unit 23 has an internal switching controller (not shown). Like a general AC power generator, when the first switching unit 22 is turned on, the AC power generation unit 23 can cycle between the first DC power from the dual power supply switching circuit 10 and ground, thereby converting the first DC power into first AC power and supplying the generated first AC power to the starter motor 2A. The waveform (frequency) of the control switching controller is based on the pulse width modulation signal of the waveform generation unit 21, that is, the AC power generation unit 23 adjusts the waveform of the first AC power based on the pulse width modulation signal.

[0029] Please refer to Figure 4, which is a block diagram of the feedback circuit 30 and its electrical connections in the circulating power storage circuit 1. The feedback circuit 30 is electrically connected to the inverter circuit 20 and the intelligent control circuit 60. Based on the comparison between the voltage value of the second AC power (referring to the output AC power of the generator motor 2C) after rectification to DC power and a set voltage value, it sends the aforementioned feedback signal to the inverter circuit 20 to control the inverter circuit 20, thereby changing the waveform of the first AC power. The operation of processing the comparison between the voltage value and the set voltage value is performed by the intelligent control circuit 60, which will be described in detail later. The intelligent control circuit 60 only transmits the comparison result to the feedback circuit 30 as a voltage signal to indirectly control the waveform generation unit 21 of the inverter circuit 20. The structure of the feedback circuit 30 mainly includes a first half-wave rectifier unit 31 and an optocoupler unit 32. The first half-wave rectifier unit 31 is electrically connected to the intelligent control circuit 60 and rectifies the second AC power from the intelligent control circuit 60 into DC power. The first half-wave rectifier unit 31 can be of any type (e.g., a diode connected in series with a resistor and a grounded capacitor in parallel), as long as it can eliminate the negative voltage component in the second AC power input to the intelligent control circuit 60 and rectify it into DC output. The optocoupler unit 32 can be a commonly used 4-pin optocoupler. The optocoupler unit 32 is electrically connected to the first half-wave rectifier unit 31 and the waveform generation unit 21 of the inverter circuit 20. Based on the ratio between the DC voltage value output by the first half-wave rectifier unit 31 and the set voltage value, it generates a corresponding voltage as a feedback signal and transmits it to the inverter circuit 20. In this embodiment, the set voltage value is set to 220V. Since the DC voltage value output by the first half-wave rectifier unit 31 comes from the (positive and negative) peak values ​​of the second AC power, the higher the peak voltage of the second AC power, the higher the DC voltage value output by the first half-wave rectifier unit 31. The input voltage of the optocoupler unit 32 is a floating DC voltage. However, within a range including the set voltage value of 220V, the optocoupler unit 32 can achieve a near-linear voltage output at the output terminal through optical signal conversion, which generates a feedback signal. Through electrical-optical-electrical conversion, the feedback signal can be used to electrically control the inverter circuit 20.

[0030] As is well known, the basic function of inverter control is to generate a pulse width modulation (PWM) signal from a raw wave generator, which then converts the raw wave into a sine wave using an AC power generator. However, in practice, this is not always the case. A device in the control system, known in the electrical world as a "load," distorts the sine wave output by the AC power generator when it operates; the amplitude may decrease, the phase may change slightly, or the frequency may become unstable. Therefore, typical feedback control circuits adjust the PWM signal based on the load's output to control the AC power generator's output. However, the feedback circuit 30 of this invention does not operate in this way. Since the second AC power comes from the output of the generator motor 2C, it is equivalent to using the output of the load of the inverter circuit 20 (starter motor 2A) (load of energy storage device 2B, generator motor 2C) as the feedback source. Many variables will cause changes in the feedback signal, such as the gear ratio between the starter motor and energy storage device 2B (if used), the power of the starter motor 2A, and the speed of the generator motor 2C. Therefore, when designing the internal components of the feedback circuit 30 and the inverter circuit 20, the characteristics of each part of the energy storage system 2 must be taken into account to avoid a mismatch between the feedback signal and the AC power output of the AC power generation unit 23, which could lead to abnormal power generation by the generator motor 2C (under normal circumstances, the peak voltage of the AC power output by the generator motor 2C fluctuates within a small range).

[0031] As described above, rectifier circuit 40 serves as another DC power source for the dual power switching circuit 10 and is also electrically connected to intelligent control circuit 60. Intelligent control circuit 60 controls rectifier circuit 40, enabling it to convert the received second AC power into a first DC power with a voltage greater than the output voltage of secondary battery module 3. For example, if the DC output voltage of secondary battery module 3 is 48V, the DC output voltage of rectifier circuit 40 can be between 48.5V and 50V. See Figure 5, which is a block diagram of rectifier circuit 40 and its electrically connected components in the circulating power storage circuit 1. Rectifier circuit 40 includes a voltage adjustment unit 41 and a rectification unit 42. Voltage adjustment unit 41 is electrically connected to intelligent control circuit 60 and adjusts the second AC power from intelligent control circuit 60 (it can be increased or decreased) so that the peak voltage of the adjusted second AC power is greater than the output voltage of secondary battery module 3. The rectifier unit 42 is electrically connected to the voltage adjustment unit 41 and the dual power supply switching circuit 10 (between the first diode 11 and the second diode 12), converting the adjusted second AC power into DC power (first DC power) and outputting it. According to the present invention, the type of the rectifier unit 42 is not limited, and it can be a full-wave rectifier circuit or a half-wave rectifier circuit.

[0032] According to the present invention, the circulating power storage circuit 1 will simultaneously store the excess power generated by the generator motor 2C (which occurs when the voltage of the second AC power rectified into DC power exceeds the set voltage value, exceeding the preset energy storage capacity of the energy storage device 2B) back into the energy storage device 2B, and also partially recharge the secondary battery module 3. The charging circuit 50 is designed to perform the aforementioned operation. The charging circuit 50 is electrically connected to the secondary battery module 3 and the intelligent control circuit 60, and is controlled by the intelligent control circuit 60 to enable or stop operation. When the charging circuit 50 is enabled, it converts the received second AC power into a second DC power to charge the secondary battery module 3. Here, the second DC power is DC power that conforms to the rated input voltage of the secondary battery module 3. Please see Figure 6, which is a block diagram of the charging circuit 50 and its electrically connected components in the circulating power storage circuit 1. The charging circuit 50 includes an AC-DC conversion unit 51, a current detection unit 52, a voltage adjustment unit 53, a charging mode control unit 54, and a charging control unit 55.

[0033] The AC-DC conversion unit 51 is electrically connected to the intelligent control circuit 60 and includes a transformer and its peripheral components. It converts the second AC power from the intelligent control circuit 60 into a second DC power that can charge the secondary battery module 3. The voltage value of the second AC power can be fine-tuned, but the waveform of the second DC power is not adjusted here. The current detection unit 52 is electrically connected to the secondary battery module 3 to detect the output current value of the secondary battery module 3 as a reference for adjusting the output second DC power. The voltage adjustment unit 53 is signal-connected to the AC-DC conversion unit 51 to control the AC-DC conversion unit 51 to fine-tune the voltage of the second DC power. The voltage adjustment unit 53 basically includes integrated circuitry that performs the aforementioned operations, thereby controlling the AC-DC conversion unit 51. The charging mode control unit 54 is signal-connected to the current detection unit 52 and generates an output control signal based on the change in the output current value detected by the current detection unit 52 over time. This output control signal includes the output voltage value and current amount. Because each secondary battery module has different characteristics, to achieve the best charging effect, the voltage and current of the second DC power supply must be adjusted in timing to perform charging modes such as constant current (CC), constant voltage (CV), constant power (CP), and constant current, constant voltage (CCCV). The output control signal is continuously output to reflect the current status of the secondary battery module 3 and control the charging mode. The charging control unit 55 is also an integrated circuit, electrically connected to the AC-DC conversion unit 51 and the secondary battery module 3, and signal-connected to the voltage adjustment unit 53 and the charging mode control unit 54. The charging control unit 55 mainly performs the following operations: First, receiving the output control signal from the charging mode control unit 54; Second, controlling the voltage adjustment unit 53 according to the output control signal to maintain the voltage value of the second DC power at the same level as the voltage value in the output control signal; Third, adjusting the current of the second DC power to be the same as the current in the output control signal, and outputting the second DC power.

[0034] The intelligent control circuit 60 is the core of the operation of the circulating power storage circuit 1. It is connected to the output terminal 2C2 of the generator motor 2C, the inverter circuit 20, the feedback circuit 30, the rectifier circuit 40, and the charging circuit 50, and performs several specified operations: First, it provides the second AC power to the feedback circuit 30; second, it compares the voltage value of the second AC power after rectification to DC power with the above-mentioned set voltage value. If the former is smaller, it enables the inverter circuit 20 and shuts down the rectifier circuit 40 and the charging circuit 50; if the former is larger, it shuts down the inverter circuit 20 and enables the rectifier circuit 40 and the charging circuit 50. As shown in the component block diagram of the intelligent charging circuit 60 and its electrical connection elements in Figure 7, the intelligent charging circuit 60 includes an electrical connection unit 61, a second half-wave rectifier unit 62, a second switching unit 63, a third switching unit 64, a fourth switching unit 65, and a comparator unit 66.

[0035] Electrical connection unit 61 is electrically connected to the output terminal 2C2 of the generator motor 2C and the feedback circuit 30 to directly output a portion of the second AC power from the output terminal 2C2 to the feedback circuit 30. Second half-wave rectifier unit 62 is electrically connected to the output terminal 2C2 and rectifies the second AC power from the generator motor 2C into DC power. Second switching unit 63 is electrically connected to the inverter circuit 20 and the output terminal 2C2, and is controlled by comparator unit 66 to turn the circuit between the inverter circuit 20 and the output terminal 2C2 on or off. Third switching unit 64 is electrically connected to the rectifier circuit 40 and the output terminal 2C2, and is controlled by comparator unit 66 to turn the circuit between the rectifier circuit 40 and the output terminal 2C2 on or off. Fourth switching unit 65 is electrically connected to the charging circuit 50 and the output terminal 2C2, and is controlled by comparator unit 66 to turn the circuit between the charging circuit 50 and the output terminal 2C2 on or off. In terms of configuration, the second switching unit 63, the third switching unit 64, and the fourth switching unit 65 can be a switch controller or a transistor. Comparator unit 66, such as a comparator integrated circuit, is electrically connected to the second half-wave rectifier unit 62, the second switching unit 63, the third switching unit 64, and the fourth switching unit 65. It compares the voltage value of the DC power from the second half-wave rectifier unit 62 with the set voltage value. If the former is smaller, the second switching unit 63 is turned on and the third switching unit 64 and the fourth switching unit 65 are turned off (effectively enabling the inverter circuit 20 and turning off the rectifier circuit 40 and the charging circuit 50); if the former is larger, the second switching unit 63 is turned off and the third switching unit 64 and the fourth switching unit 65 are turned on (effectively turning off the inverter circuit 20 and enabling the rectifier circuit 40 and the charging circuit 50).

[0036] To illustrate the operation of the circulating power storage circuit 1 and its impact on the power storage system 2, please refer to Figure 8. Figure 8 is a timing comparison diagram (schematic diagram) of the peak voltage change of the first AC power output from the inverter circuit 20 and the peak voltage change of the second AC power output from the generator motor 2C. When time is 0 and the circulating power storage circuit 1 starts operating, the rectifier circuit 40 is turned off (disabled) under the control of the intelligent control circuit 60, so the output voltage is zero. At this time, the secondary battery module 3 has a certain output voltage, so it can provide the first DC power to the inverter circuit 20, and the first AC power generated by the inverter circuit 20 also gradually begins to increase. At time T1, the peak voltage of the first AC power reaches its maximum, for example, 110V. Around this time, the generator motor 2C also begins to gradually increase the peak voltage of the second AC power output as the flywheel rotates. As mentioned earlier, the voltage value is set to 220V in this embodiment. When time reaches T2, the second AC power exceeds the set voltage value, for example, reaching 230V. The intelligent control circuit 60 shuts down the inverter circuit 20 and enables the rectifier circuit 40 and charging circuit 50. At this time, the DC voltage output by the rectifier circuit 40 slightly exceeds the DC voltage of the secondary battery module 3, thus the rectifier circuit 40 becomes the power source for the first DC power. The secondary battery module 3 not only cannot output power but is also charged due to the enabling of the charging circuit 50. Before T2, because the voltage value of the second AC power rectified into DC power is less than the set voltage value, the inverter circuit 20 is enabled while the rectifier circuit 40 and charging circuit 50 are off, thus the secondary battery module 3 continuously supplies power to the inverter circuit 20.

[0037] When time reaches T2, since inverter circuit 20 is turned off, although secondary battery module 3 can supply power to inverter circuit 20, inverter circuit 20 does not convert the first DC power nor output the first AC power, and the peak value of the second AC power voltage will drop momentarily. The flywheel is still rotating at high speed and has kinetic energy, so it continues to drive generator motor 2C to generate electricity, and the voltage of the second AC power peak value will rebound until it stabilizes at T3. At T4, the flywheel's energy begins to decrease, and the voltage of the second AC power peak value also begins to decrease. At T5, the voltage of the second AC power rectified into DC power is less than the set voltage value, inverter circuit 20 is enabled, and rectifier circuit 40 and charging circuit 50 are reversed and turned off. Secondary battery module 3 starts supplying power to inverter circuit 20 again to accelerate the flywheel's kinetic energy, repeating the situation between T1 and T2. The circulating power storage circuit 1 repeats the cycle from T1 to T5, storing circulating power. The feedback circuit 30 performs the operation of controlling the inverter circuit 20 to change the first AC power waveform at all times.

[0038] As mentioned earlier, if the flywheel receives external energy, the time between T1 and T2 will decrease, and the time between T3 and T5 will increase. However, if this exceeds the upper limit of the energy storage system 2, the excess energy will be stored back into the secondary battery module 3, and any further excess will be wasted. Conversely, if the load connected to the generator motor 2C starts consuming power, the time between T1 and T2 will increase, and the time between T3 and T5 will decrease, potentially causing the secondary battery module 3 to further consume its energy.

[0039] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

[0040] 1: Circulating power storage circuit 2: Electrical storage system 2A: Start the motor 2B: Energy storage device 2B1: Outer box 2B2: Water Storage Tank 2B21: Internal water outlet 2B3: Archimedes spiral pump 2B11: Inlet 2B12: Outlet water outlet 2C: Generator Motor 2C1: Rotary blade 2C2: Output terminal 3: Secondary battery module 10: Dual power supply switching circuit 11: First Dipolar Body 12: Second Dipolar Body 20: Inverter Circuit 21: Waveform Generation Unit 22: First Switching Unit 23: Alternating Current Generating Unit 30: Feedback Circuit 31: First Half-Wave Rectifier Unit 32: Optical coupling unit 40: Rectifier circuit 41: Voltage Regulation Unit 42: Rectifier Unit 50: Charging circuit 51: AC-DC conversion unit 52: Current Detection Unit 53: Voltage Adjustment Unit 54: Charging Mode Control Unit 55: Charging control unit 60: Intelligent control circuit 61: Electrical connection unit 62: Second Half-Wave Rectifier Unit 63: Second Switching Unit 64: Third Switching Unit 65: Fourth Switching Unit 66: Comparator Unit

Claims

1. A circulating power storage circuit for converting a first AC power into potential energy or kinetic energy coupled to an energy storage device via a starter motor, and obtaining a second AC power converted from potential energy or kinetic energy via a generator motor coupled to the energy storage device, comprising: a dual power supply switching circuit electrically connected to two DC power supplies and outputting a first DC power from the DC power supply with a larger voltage, one of the DC power supplies being a secondary battery module; an inverter circuit electrically connected to the dual power supply switching circuit and the starter motor, enabling the conversion of the first DC power into the first AC power and supplying it to the starter motor; and a feedback circuit electrically connected to the inverter circuit, which, based on a comparison between the voltage value of the second AC power after rectification to DC power and a set voltage value, sends a feedback signal to the inverter circuit to control the inverter circuit to change the waveform of the first AC power. The system comprises: a rectifier circuit, serving as the other DC power source for the dual-power switching circuit, which is enabled to convert the received second AC power into a first DC power with a voltage greater than the output voltage of the secondary battery module; a charging circuit, electrically connected to the secondary battery module, which is enabled to convert the received second AC power into a second DC power to charge the secondary battery module; and an intelligent control circuit, electrically connected to the output terminal of the generator motor, the inverter circuit, the feedback circuit, the rectifier circuit, and the charging circuit, which performs the following operations: providing the second AC power to the feedback circuit; and comparing the voltage value of the second AC power after rectification to DC power with the set voltage value, wherein if the former is smaller, the inverter circuit is enabled and the rectifier circuit and the charging circuit are turned off; and if the former is larger, the inverter circuit is turned off and the rectifier circuit and the charging circuit are enabled.

2. The circulating power storage circuit as claimed in claim 1, wherein the energy storage device is a flywheel or a device that uses varying storage water levels to store or release energy.

3. The circulating power storage circuit as claimed in claim 1, wherein the dual power switching circuit is formed by two diodes connected in series, the secondary battery module is electrically connected to the anode of a first diode, the rectifier circuit is electrically connected to the electrical connection line of the diodes, and the inverter circuit is electrically connected to the cathode of a second diode.

4. The circulating power storage circuit as claimed in claim 1, wherein the inverter circuit further comprises: a waveform generation unit that generates a corresponding pulse width modulation signal according to the received feedback signal; a first switching unit that is electrically connected to the intelligent control circuit and controlled by the intelligent control circuit to be turned on or off; and an AC power generation unit that is electrically connected to the output terminal of the dual power supply switching circuit through the first switching unit and signal-connected to the waveform generation unit, wherein when the first switching unit is turned on, the first DC power is converted into the first AC power, and the waveform of the first AC power is adjusted based on the pulse width modulation signal.

5. The circulating power storage circuit as claimed in claim 1, wherein the feedback circuit further comprises: a first half-wave rectifier unit electrically connected to the intelligent control circuit, which rectifies the second AC power from the intelligent control circuit into DC power; and an optocoupler unit electrically connected to the first half-wave rectifier unit and the inverter circuit, which generates a corresponding voltage as a feedback signal based on the ratio between the DC voltage value and the set voltage value, and transmits it to the inverter circuit.

6. The circulating power storage circuit as claimed in claim 1, wherein the rectifier circuit further comprises: a voltage adjustment unit electrically connected to the intelligent control circuit, adjusting the second AC power from the intelligent control circuit such that the peak voltage of the adjusted second AC power is greater than the voltage value of the output voltage of the secondary battery module; and a rectifier unit electrically connected to the voltage adjustment unit and the dual power supply switching circuit, converting the adjusted second AC power into DC power and outputting it.

7. The circulating power storage circuit as claimed in claim 6, wherein the rectifier unit is a full-wave rectifier circuit or a half-wave rectifier circuit.

8. The circulating power storage circuit as claimed in claim 1, wherein the charging circuit further comprises: an AC-DC conversion unit electrically connected to the intelligent control circuit, for converting the second AC power from the intelligent control circuit into the second DC power capable of charging the secondary battery module; a current detection unit electrically connected to the secondary battery module to detect the output current value of the secondary battery module; a voltage adjustment unit signal-connected to the AC-DC conversion unit for fine-tuning the voltage of the second DC power; and a charging mode control unit signal-connected to the current detection unit, based on the output current... The value changes over time to generate an output control signal, which includes the output voltage value and current amount; and a charging control unit, electrically connected to the AC-DC conversion unit and the secondary battery module, and signal-connected to the voltage adjustment unit and the charging mode control unit, performs the following operations: receiving the output control signal; controlling the voltage adjustment unit according to the output control signal to maintain the voltage value of the second DC power at the same level as the voltage value in the output control signal; and adjusting the current amount of the second DC power to be the same as the current amount in the output control signal, and outputting the second DC power.

9. The circulating power storage circuit as claimed in claim 1, wherein the intelligent control circuit further comprises: an electrical connection unit electrically connected to the output terminal of the generator motor and the feedback circuit to directly output a portion of the second AC power from the output terminal to the feedback circuit; a second half-wave rectifier unit electrically connected to the output terminal to rectify the second AC power into DC power; a second switching unit electrically connected to the inverter circuit and the output terminal, controlled to turn the circuit between the inverter circuit and the output terminal on or off; and a third switching unit electrically connected to the rectifier circuit and the output terminal, controlled to turn the rectifier circuit on or off. The circuit between the output terminal and the charging circuit; a fourth switching unit, electrically connected to the charging circuit and the output terminal, controlled to turn the circuit between the charging circuit and the output terminal on or off; and a comparator unit, electrically connected to the second half-wave rectifier unit, the second switching unit, the third switching unit and the fourth switching unit at the output terminal of the generator motor, comparing the voltage value of the DC power from the second half-wave rectifier unit with the set voltage value. If the former is smaller, the second switching unit is turned on and the third and fourth switching units are turned off; if the former is larger, the second switching unit is turned off and the third and fourth switching units are turned on.

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