Environmental energy collection system and method, electronic equipment and medium

Abstract

The invention provides an environment energy collection system and method, electronic equipment and a medium. The environment energy collection system comprises a first alternating current environment energy collector, a second alternating current environment energy collector, an energy synchronous collection interface circuit and a controller, the first alternating current environment energy collector is electrically connected with the energy synchronous collection interface circuit and used for converting collected first environment energy into alternating current voltage and providing the alternating current voltage for the energy synchronous collection interface circuit. The second alternating-current environment energy collector is electrically connected with the energy synchronous collection interface circuit and is used for converting the collected second environment energy into alternating-current voltage and providing the alternating-current voltage for the energy synchronous collection interface circuit; the controller is electrically connected with the energy synchronous collection interface circuit and is used for adjusting the working mode of the energy synchronous collection interface circuit and controlling the output voltage of the energy synchronous collection interface circuit; the environment energy collection capability can be improved, and the stable and reliable energy supply effect can be provided.

Description

Technical Field

[0001] This disclosure relates to the field of energy harvesting technology, and more particularly to an energy harvesting system, method, electronic device, and medium. Background Technology

[0002] Energy harvesting technology refers to the technology of collecting energy in different physical forms from the natural environment through energy harvesters and converting it into electrical energy for storage, management and use.

[0003] Energy harvesting technology can be applied to widely distributed IoT devices, providing power for low-power IoT devices. Currently, this technology is widely used in railway monitoring, wearable devices, factory monitoring, and other applications.

[0004] However, existing environmental energy harvesting equipment has low output power and intermittent energy supply, making it unable to provide stable and reliable power for IoT devices. Summary of the Invention

[0005] This disclosure provides an environmental energy harvesting system, method, electronic device, and medium to solve the aforementioned technical problems.

[0006] According to a first aspect of this disclosure, an environmental energy harvesting system is provided, comprising: a first AC environmental energy harvester, a second AC environmental energy harvester, an energy synchronization harvesting interface circuit, and a controller;

[0007] The first AC ambient energy harvester is electrically connected to the energy synchronization harvesting interface circuit, and is used to convert the collected first ambient energy into AC voltage and provide it to the energy synchronization harvesting interface circuit.

[0008] The second AC ambient energy harvester is electrically connected to the energy synchronization harvesting interface circuit and is used to convert the harvested second ambient energy into AC voltage and provide it to the energy synchronization harvesting interface circuit.

[0009] The controller is electrically connected to the energy synchronization harvesting interface circuit and is used to adjust the operating mode of the energy synchronization harvesting interface circuit and control the output voltage of the energy synchronization harvesting interface circuit. The output voltage is greater than or equal to the operating voltage of the load.

[0010] Optionally, the first AC ambient energy harvester is used to harvest one type of ambient energy: light energy, temperature difference energy, vibration energy, or radio frequency energy; the second AC ambient energy harvester is used to harvest one type of ambient energy: light energy, temperature difference energy, vibration energy, or radio frequency energy; and the first AC ambient energy harvester and the second AC ambient energy harvester harvest different types of ambient energy.

[0011] Optionally, the energy synchronization harvesting interface circuit includes: an energy conversion circuit, a shared inductor, and a switching circuit; the energy conversion circuit is electrically connected to the first AC ambient energy harvester, the second AC ambient energy harvester, the shared inductor, and the controller, respectively; the switching circuit is electrically connected to the shared inductor, the controller, and the load, respectively.

[0012] The energy conversion circuit is used to convert AC power into DC power according to the control signal of the controller, and to provide the DC power to the shared inductor;

[0013] The switching circuit is used to control the charging or discharging of the shared inductor according to the control signal from the controller.

[0014] Optionally, the energy conversion circuit includes: a first rectifier bridge, a second rectifier bridge, and a mode switching unit; the input terminal of the first rectifier bridge is electrically connected to the output terminal of the first AC ambient energy harvester, and the output terminal of the first rectifier bridge is electrically connected to the input terminal of the mode switching unit; the input terminal of the second rectifier bridge is electrically connected to the output terminal of the second AC ambient energy harvester, and the output terminal of the second rectifier bridge is electrically connected to the input terminal of the mode switching unit; the mode switching unit is electrically connected to the controller and a first terminal of the shared inductor; the second terminal of the shared inductor is grounded;

[0015] The first rectifier bridge is used to convert the AC power provided by the first AC ambient energy harvester into DC power, and to provide the DC power to the mode switching unit;

[0016] The second rectifier bridge is used to convert the AC power provided by the second AC ambient energy harvester into DC power, and to provide the DC power to the mode switching unit;

[0017] The mode switching unit is used to control the DC output of the first rectifier bridge and the second rectifier bridge in a time-sharing manner or in series according to the control signal of the controller.

[0018] Optionally, the mode switching unit includes: a first capacitor, a second capacitor, a first charging switch, a second charging switch, a first switching switch, a second switching switch, a third switching switch, and a fourth switching switch;

[0019] The first terminal of the first charging switch is electrically connected to the first input terminal of the mode switching unit, the second terminal of the first charging switch is electrically connected to the second terminal of the first switching switch and the first terminal of the first capacitor, and the control terminal of the first charging switch is electrically connected to the controller.

[0020] The first terminal of the second charging switch is electrically connected to the third input terminal of the mode switching unit, the second terminal of the second charging switch is electrically connected to the second terminal of the third switching switch and the first terminal of the second capacitor, and the control terminal of the second charging switch is electrically connected to the controller.

[0021] The first terminal of the first switching switch is electrically connected to the first terminal of the second switching switch and the first output terminal of the mode switching unit, and the control terminal of the first switching switch is electrically connected to the controller.

[0022] The second terminal of the second switch is electrically connected to the second terminal of the first capacitor, the second input terminal of the mode switching unit, the first terminal of the third switch, and the first terminal of the fourth switch, respectively. The control terminal of the second switch is electrically connected to the controller.

[0023] The second terminal of the fourth switching switch is electrically connected to the second terminal of the second capacitor and the fourth input terminal of the mode switching unit, and grounded.

[0024] Optionally, the switching circuit includes a fifth switching switch; the first terminal of the fifth switching switch is electrically connected to the first output terminal of the energy conversion circuit, the second terminal of the fifth switching switch is grounded, and the control terminal of the fifth switching switch is electrically connected to the controller;

[0025] The fifth switching switch is used to switch to the on state when a control signal is received, and to switch to the off state when no control signal is received;

[0026] The shared inductor is used to charge when the fifth switch is switched to the on state and to discharge when the fifth switch is switched to the off state.

[0027] Optionally, the energy synchronization harvesting interface circuit further includes a freewheeling diode, the first end of which is electrically connected to the first end of the shared inductor, and the second end of which is electrically connected to the load.

[0028] Optionally, the energy synchronization harvesting interface circuit further includes an output capacitor, the first end of which is electrically connected to the second end of the freewheeling diode, and the second end of the output capacitor is grounded.

[0029] According to a second aspect of this disclosure, an environmental energy harvesting method is provided, comprising:

[0030] The operating parameters are obtained, including the voltage values ​​of each capacitor in the energy synchronization harvesting interface circuit and the operating voltage of the load; the energy stored in each capacitor is provided by the first AC ambient energy harvester and the second AC ambient energy harvester.

[0031] The operating mode of the energy synchronization harvesting interface circuit is determined based on the voltage values ​​of each capacitor within the energy synchronization harvesting interface circuit.

[0032] The output voltage of the energy synchronous harvesting interface circuit is controlled according to the operating mode and the operating voltage of the load, and the output voltage is greater than or equal to the operating voltage of the load.

[0033] Optionally, the operating mode of the energy synchronization harvesting interface circuit is determined based on the voltage values ​​of each capacitor within the energy synchronization harvesting interface circuit, including:

[0034] Obtain the initial relationship between the voltage value of each capacitor and its respective voltage threshold.

[0035] When the first size relationship indicates that the voltage value of at least one capacitor is less than its respective voltage threshold, the working mode of the energy synchronous harvesting interface circuit is determined to be the first working mode, in which the first AC ambient energy harvester and the second AC ambient energy harvester are time-division multiplexed for power supply.

[0036] When the first size relationship indicates that the voltage value of each capacitor is greater than or equal to its respective voltage threshold, the working mode of the energy synchronous harvesting interface circuit is determined to be the second working mode. In the second working mode, the first AC ambient energy harvester and the second AC ambient energy harvester are connected in series and synchronously powered.

[0037] Optionally, controlling the output voltage of the energy synchronization harvesting interface circuit according to the operating mode and the operating voltage of the load includes:

[0038] The target switching frequency of the fifth switching switch in the energy synchronization harvesting interface circuit under the operating mode is determined based on the operating voltage of the load.

[0039] The energy conversion circuit in the energy synchronous harvesting interface circuit is controlled according to the operating mode, and the fifth switching switch is controlled to be turned on or off according to the target switching frequency, so as to control the output voltage of the energy synchronous harvesting interface circuit, wherein the output voltage is greater than or equal to the operating voltage of the load.

[0040] According to a third aspect of this disclosure, an electronic device is provided, comprising an ambient energy harvesting system as described in any of the first aspects; the controller of the ambient energy harvesting system includes a processor and a memory;

[0041] The memory is used to store computer programs that can be executed by the processor;

[0042] The processor is configured to execute a computer program in the memory to implement the method as described in any of the second aspects.

[0043] According to a fourth aspect of this disclosure, a non-transitory computer-readable storage medium is provided, which, when an executable computer program in the storage medium is executed by a processor, enables the implementation of the method as described in any of the second aspects.

[0044] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0045] The environmental energy harvesting system provided in this embodiment uses a first AC environmental energy harvester and a second AC environmental energy harvester to collect environmental energy, which can improve the environmental energy harvesting capability; and, the energy provided by the first AC environmental energy harvester and the second AC environmental energy harvester can improve the output power capability, thereby achieving the effect of providing stable and reliable power supply to the load.

[0046] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0047] Figure 1 This is a block diagram of an environmental energy harvesting system according to an embodiment of the present disclosure.

[0048] Figure 2 This is a block diagram of an energy synchronization harvesting interface circuit according to an embodiment of the present disclosure.

[0049] Figure 3 This is a circuit diagram of an energy conversion circuit according to an embodiment of the present disclosure.

[0050] Figure 4 This is an equivalent circuit diagram of mode 1 under a first operating mode according to an embodiment of the present disclosure.

[0051] Figure 5 This is an equivalent circuit diagram of mode 2 under a first operating mode according to an embodiment of the present disclosure.

[0052] Figure 6 This is an equivalent circuit diagram of mode 3 under a first operating mode according to an embodiment of the present disclosure.

[0053] Figure 7 This is an equivalent circuit diagram of mode 4 in a first operating mode according to an embodiment of the present disclosure.

[0054] Figure 8 This is an equivalent circuit diagram of mode 1 in a second operating mode according to an embodiment of the present disclosure.

[0055] Figure 9 This is an equivalent circuit diagram of mode 2 in a second operating mode according to an embodiment of the present disclosure.

[0056] Figure 10This is a flowchart of an environmental energy harvesting method according to an embodiment of the present disclosure.

[0057] Figure 11 This is a flowchart illustrating one embodiment of the present disclosure of obtaining a working mode.

[0058] Figure 12 This is a flowchart illustrating the output voltage of a control energy synchronization harvesting interface circuit according to an embodiment of the present disclosure.

[0059] Figure 13 This is a block diagram of an electronic device according to an embodiment of the present disclosure. Detailed Implementation

[0060] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.

[0061] This disclosure provides an environmental energy harvesting system, method, electronic device, and medium. See also Figure 1 The environmental energy harvesting system includes: a first AC environmental energy harvester 11, a second AC environmental energy harvester 12, an energy synchronization harvesting interface circuit 13, and a controller 14;

[0062] The first AC ambient energy harvester 11 is electrically connected to the energy synchronization harvesting interface circuit 13, and is used to convert the collected first ambient energy into AC voltage and provide it to the energy synchronization harvesting interface circuit 13.

[0063] The second AC ambient energy harvester 12 is electrically connected to the energy synchronization harvesting interface circuit 13, and is used to convert the harvested second ambient energy into AC voltage and provide it to the energy synchronization harvesting interface circuit 13.

[0064] The controller 14 is electrically connected to the energy synchronization harvesting interface circuit 13 and is used to adjust the operating mode of the energy synchronization harvesting interface circuit 13 and control the output voltage of the energy synchronization harvesting interface circuit 13.

[0065] Understandably, the first AC ambient energy harvester 11 is used to harvest one of the following types of energy: light energy, thermoelectric energy, vibration energy, or radio frequency energy. The second AC ambient energy harvester 12 is used to harvest one of the following types of energy: light energy, thermoelectric energy, vibration energy, or radio frequency energy. Furthermore, the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 harvest different types of ambient energy. Those skilled in the art can select the energy harvested by the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 according to the specific scenario. For example, the first AC ambient energy harvester 11 can harvest vibration energy, such as high-frequency vibration energy with a frequency greater than 100Hz or low-frequency vibration energy with a frequency less than 100Hz. Similarly, the second AC ambient energy harvester 12 can harvest radio frequency energy, such as radiation energy with a frequency greater than 900MHz.

[0066] Understandably, after determining the energy to be collected, the implementation methods of the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 can be selected. For example, the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 can adopt AC generators, nano-AC generators, piezoelectric ceramic materials, photovoltaic modules, etc., and can be selected according to the specific scenario. As long as the AC ambient energy can be converted into AC electricity, the corresponding scheme falls within the protection scope of this disclosure.

[0067] In one embodiment, see Figure 2 The energy synchronous harvesting interface circuit 13 includes: an energy conversion circuit 21, a shared inductor L, and a switching circuit 22; the input terminal of the energy conversion circuit 21 is electrically connected to the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12, respectively; the output terminal of the energy conversion circuit 21 is electrically connected to the input terminal of the switching circuit 22; and the control terminal of the energy conversion circuit 21 is electrically connected to the controller 14; the output terminal of the switching circuit 22 is electrically connected to the first terminal of the shared inductor L; the second terminal of the switching circuit 22 and the second terminal of the shared inductor L are both grounded; and the control terminal of the switching circuit 22 is electrically connected to the controller 14.

[0068] Energy conversion circuit 21 is used to convert AC power into DC power according to the control signal of controller 14, and to supply DC power to switching circuit 22;

[0069] The switching circuit 22 is used to switch to the on or off state according to the control signal of the controller 14, so as to control the charging or discharging of the shared inductor L.

[0070] In this embodiment, a Buck-Boost step-up / step-down circuit can be formed by switching circuit 22, shared inductor L and energy conversion circuit 21. Switching circuit 22 can adjust the charging and discharging time of shared inductor L to achieve the effect of adjusting output voltage.

[0071] In one embodiment, see Figure 3 The energy conversion circuit 21 includes: a first rectifier bridge 211, a second rectifier bridge 212, and a mode switching unit 213; the mode switching unit 213 is electrically connected to the first rectifier bridge 211 and the second rectifier bridge 212 respectively.

[0072] The first rectifier bridge 211 is also electrically connected to the first AC ambient energy harvester 11, and is used to convert the AC power provided by the first AC ambient energy harvester 11 into DC power, and provide the DC power to the mode switching unit 213.

[0073] The second rectifier bridge 212 is also electrically connected to the second AC ambient energy harvester 12, and is used to convert the AC power provided by the second AC ambient energy harvester 12 into DC power, and provide the DC power to the mode switching unit 213.

[0074] The mode switching unit 213 is electrically connected to the controller 14 and the switching circuit 22 respectively, and is used to switch the DC output mode according to the control signal of the controller 14. The output mode includes the DC output of the first rectifier bridge 211 and the second rectifier bridge 212 in a time-sharing manner or in series.

[0075] In one embodiment, see further. Figure 3 The first rectifier bridge 211 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The anode of the first diode D1 is electrically connected to the first output terminal of the first AC ambient energy harvester 11 and the cathode of the third diode D3, respectively. The cathode of the first diode D1 is electrically connected to the cathode of the second diode D2 and the first input terminal of the mode switching unit 213, respectively. The anode of the second diode D2 is electrically connected to the second output terminal of the first AC ambient energy harvester 11 and the cathode of the fourth diode D4, respectively. The anode of the fourth diode D4 is electrically connected to the anode of the third diode D3 and the second input terminal of the mode switching unit 213 and grounded to GND.

[0076] In one embodiment, see further. Figure 3 The second rectifier bridge 212 includes a fifth diode D5, a sixth diode D6, a seventh diode D7, and an eighth diode D8. The anode of the fifth diode D5 is electrically connected to the first output terminal of the second AC ambient energy harvester 12 and the cathode of the seventh diode D7, respectively. The cathode of the fifth diode D5 is electrically connected to the cathode of the sixth diode D6 and the third input terminal of the mode switching unit 213, respectively. The anode of the sixth diode D6 is electrically connected to the second output terminal of the second AC ambient energy harvester 12 and the cathode of the eighth diode D8, respectively. The anode of the eighth diode D8 is electrically connected to the anode of the seventh diode D7 and the fourth input terminal of the mode switching unit 213 and grounded to GND.

[0077] In one embodiment, see further. Figure 3 The mode switching unit 213 includes: a first capacitor Cin1, a second capacitor Cin2, a first charging switch Sin1, a second charging switch Sin1, a first switching switch S1, a second switching switch S2, a third switching switch S3, and a fourth switching switch S4.

[0078] The first terminal of the first charging switch Sin1 is electrically connected to the first input terminal of the mode switching unit 213, the second terminal of the first charging switch Sin1 is electrically connected to the second terminal of the first switching switch S1 and the first terminal of the first capacitor Cin1, and the control terminal of the first charging switch Sin1 is electrically connected to the controller 14.

[0079] The first end of the second charging switch Sin2 is electrically connected to the third input end of the mode switching unit 213, the second end of the second charging switch Sin2 is electrically connected to the second end of the third switching switch S3 and the first end of the second capacitor Cin2, and the control end of the second charging switch Sin2 is electrically connected to the controller 14.

[0080] The first terminal of the first switching switch S1 is electrically connected to the first terminal of the second switching switch S2 and the first terminal of the switching circuit, respectively. The control terminal of the first switching switch S1 is electrically connected to the controller 14.

[0081] The second terminal of the second switching switch S2 is electrically connected to the second terminal of the first capacitor Cin1, the second input terminal of the mode switching unit 213, the first terminal of the third switching switch S3 and the first terminal of the fourth switching switch S4, respectively. The control terminal of the second switching switch S2 is electrically connected to the controller 14.

[0082] The second terminal of the fourth switching switch S4 is electrically connected to the second terminal of the second capacitor Cin2 and the fourth input terminal of the mode switching unit 213 and grounded.

[0083] In one embodiment, see further. Figure 3 The switching circuit 22 includes a fifth switching switch S5. The second terminal of the fifth switching switch S5 is electrically connected to the second terminal of the shared inductor L. The second terminals of the fifth switching switch S5 and the shared inductor L are grounded. The control terminal of the fifth switching switch S5 is electrically connected to the controller 14. Thus, the fifth switching switch S5 is used to switch to the on state when a control signal is received, and also to switch to the off state when no control signal is received. The shared inductor L is used to charge when the fifth switching switch S5 is switched to the on state and to discharge when the fifth switching switch S5 is switched to the off state.

[0084] In one embodiment, see further. Figure 3The energy synchronization harvesting interface circuit also includes a freewheeling diode D9. The first terminal of the freewheeling diode D9 is electrically connected to the first terminal of the shared inductor L and the second terminal of the switching circuit 22, respectively. The second terminal of the freewheeling diode D9 is electrically connected to the load RL. The shared inductor L and the load RL (or the subsequent output capacitor Cout) form a discharge circuit, achieving the effect of supplying power to the load. Furthermore, when the fifth switching switch S5 is open, the current supplied by the load cannot flow back, achieving the effect of protecting the preceding circuit. In one embodiment, see further... Figure 3 The energy synchronous harvesting interface circuit also includes an output capacitor Cout. The first terminal of the output capacitor Cout is electrically connected to the second terminal of the freewheeling diode D9, and the second terminal of the output capacitor Cout is grounded. The output capacitor Cout can store the energy provided by the first capacitor Cin1, the second capacitor Cin2, and the shared inductor L.

[0085] Combination Figures 1-3 Example of an environmental energy harvesting system, whose operating modes include:

[0086] First working mode

[0087] In this example, the first operating mode refers to the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 independently transmitting energy, or in other words, time-division multiplexing the collection of ambient energy. That is, the first capacitor Cin1 and the second capacitor Cin2 are time-division multiplexed in their power supply. It is understood that the first operating mode is suitable for scenarios with weak ambient energy and insufficient power supply. The first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 achieve sufficient collection of ambient energy by time-division multiplexing the collection of ambient energy over a longer period. It is assumed that the instantaneous power provided by the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 is low, i.e., the charging current provided is very small.

[0088] In one example, in the first operating mode, the first capacitor Cin1 discharges and the second capacitor Cin2 charges.

[0089] The discharge of the first capacitor Cin1 includes two modes: mode 1, the first capacitor Cin1 charges the shared inductor L; mode 2, the first capacitor Cin1 and the shared inductor L jointly supply power to the load.

[0090] Mode 1: The first charging switch Sin1 and the second switching switch S2 are switched to the off state; the first switching switch S1, the fourth switching switch S4, and the fifth switching switch S5 are switched to the on state, thus obtaining the power supply circuit for the first capacitor Cin1 to charge the shared inductor L. The equivalent circuit is as follows: Figure 4 As shown.

[0091] Mode 2: The first charging switch Sin1, the first switching switch S1, the second switching switch S2, the third switching switch S3, the fourth switching switch S4, and the fifth switching switch S5, or the first switching switch S1, the second switching switch S2, the third switching switch S3, the fourth switching switch S4, and the fifth switching switch S5 are switched to the off state, and the first charging switch Sin1 is in the on state, so the first capacitor Cin1 can be charged. In this mode, the shared inductor L charges the output capacitor Cout, that is, the shared inductor L, the output capacitor Cout, and the freewheeling diode D9 constitute the power supply circuit for supplying power to the load. The equivalent circuit is as follows. Figure 5 The example is a dashed line.

[0092] It should be noted that, Figure 4 and Figure 5 The example also illustrates the charging circuit (solid line circuit) of the second AC ambient energy harvester 12 to the second capacitor Cin2 via the second rectifier bridge, where the maximum voltage of the second capacitor Cin2 is Vin2. It is evident that the discharging circuit of the first capacitor Cin1 and the charging circuit of the second capacitor Cin2 do not affect each other.

[0093] In another example, in the first operating mode, the second capacitor Cin2 discharges while the first capacitor Cin1 charges.

[0094] The discharge of the second capacitor Cin2 includes two modes: mode 3, in which the second capacitor Cin2 charges the shared inductor L; and mode 4, in which the second capacitor Cin2 and the shared inductor L jointly supply power to the load.

[0095] Mode 3: The second charging switch Sin2, the first switching switch S1, and the fourth switching switch S4 are switched to the off state; the second switching switch S2, the third switching switch S3, and the fifth switching switch S5 are switched to the on state, thus obtaining the power supply circuit for the second capacitor Cin2 to charge the shared inductor L. The equivalent circuit is as follows: Figure 6 The example is a dashed line.

[0096] Mode 4: The second charging switch Sin2, the first switching switch S1, the second switching switch S2, the third switching switch S3, the fourth switching switch S4, and the fifth switching switch S5 are switched to the off state; the first charging switch Sin1 is switched to the on state. In this mode, the shared inductor L, the output capacitor Cout, and the freewheeling diode D9 constitute the power supply circuit for supplying power to the load. The equivalent circuit is as follows: Figure 7 The example is a dashed line.

[0097] It should be noted that, Figure 6 and Figure 7Meanwhile, a charging circuit (solid-line circuit) in which the first AC ambient energy harvester 11 charges the first capacitor Cin1 through the first rectifier bridge is illustrated. The maximum voltage of the first capacitor Cin1 is Vin1. It can be seen that the discharging circuit of the second capacitor Cin2 and the charging circuit of the first capacitor Cin1 do not affect each other.

[0098] In this embodiment, the controller completes the switching between Mode 1 and Mode 2 in the first half cycle (0 < t < T / 2); completes the switching between Mode 3 and Mode 4 in the second half cycle (T / 2 < t < T); and the time ratio of the switching between Modes 1 to 4 determines the magnitude of the output voltage of the Boost buck-boost circuit. Here, T is the system operating period, and the relationship with the system power frequency f is f = 1 / T; t is the timing time, and when t exceeds T, it is cleared and the timing restarts.

[0099] Combining the above process, in the first operating mode, the maximum input voltage of the ambient energy harvesting system is Vin1 or Vin2, and the maximum transferred energy per cycle is the energy E1 stored in the first capacitor Cin1 and the second capacitor Cin2, as shown in Equation (1).

[0100]

[0101] If the boosting effect of the Boost buck-boost circuit is not considered, the maximum output voltage Vout1 of the system is as shown in Equation (2).

[0102] V out1 = max{V in1 , V in2} (2)

[0103] Based on the above assumptions, the maximum output instantaneous power of the system is Pout1, as shown in Equation (3).

[0104]

[0105] Second operating mode

[0106] In this example, the second operating mode refers to the scenario where the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 output energy simultaneously; or rather, by connecting the first capacitor Cin1 and the second capacitor Cin2 in series, while synchronously harvesting two different types of AC ambient energy, the maximum input voltage and the maximum instantaneous output power of the system are increased. It can be understood that in this operating mode, the first AC ambient energy harvester 11 and the second AC ambient energy harvester 12 have a strong ability to provide current, so as to keep the voltages of the first capacitor Cin1 and the second capacitor Cin2 stable.

[0107] The second operating mode includes: Mode 1, where the first capacitor Cin1 and the second capacitor Cin2 are connected in series to charge the shared inductor L; Mode 2, the first capacitor Cin1, the second capacitor Cin2 and the shared inductor L together supply power to the load.

[0108] Mode 1: The first charging switch Sin1 and the second charging switch Sin2 are switched to the ON state, the first switching switch S1, the third switching switch S3 and the fifth switching switch S5 are switched to the ON state, and the second switching switch S2 and the fourth switching switch S4 are switched to the OFF state. At this time, the first capacitor Cin1 and the second capacitor Cin2 are connected in series and charge the shared inductor L together. The equivalent circuit is as follows: Figure 8 The example is a dashed line.

[0109] Mode 2: The first charging switch Sin1 and the second charging switch Sin2 are switched to the ON state, and the first switching switch S1, the second switching switch S2, the third switching switch S3, the fourth switching switch S4, and the fifth switching switch S5 are switched to the OFF state. At this time, the shared inductor L, the output capacitor Cout, and the freewheeling diode D9 are connected in series to form the load power supply circuit, and the equivalent circuit is as follows. Figure 9 The example is a dashed line.

[0110] In the second working mode, the maximum input voltage of the environmental energy harvesting system is Vin1+Vin2. The maximum energy transmitted in each cycle is determined by the load. If the boost effect of the boost circuit is not considered, the maximum output voltage of the system is Vout2, as shown in equation (4).

[0111] V out2 =V in1 +V in2 (4)

[0112] Furthermore, the maximum instantaneous output power of the system is Pout2, as shown in equation (5).

[0113]

[0114] Comparing equations (3) and (5), it can be seen that the maximum instantaneous power output by the system in operating mode 2 is greater than the sum of the output power in the first half-cycle and the second half-cycle in operating mode 1, that is:

[0115]

[0116] In this embodiment, the second operating mode can significantly increase the maximum instantaneous power of the energy synchronous harvesting system for multiple different types of AC environments.

[0117] By combining the first and second working modes, this disclosed solution can be applied to various environmental conditions to fully collect energy from multiple AC types of environments. It not only realizes the function of simultaneous collection of energy from two AC environments, increasing the total amount of energy collected, but also, through switching working modes, can increase the maximum instantaneous output power of the system when the environmental energy is sufficient, thus better meeting the power supply needs of IoT devices.

[0118] based on Figures 1-9 The illustrated environmental energy harvesting system, in this disclosure embodiment also provides an environmental energy harvesting method, see [link to relevant documentation]. Figure 10 This includes steps 101 to 103.

[0119] In step 101, operating parameters are obtained, including the voltage values ​​of each capacitor in the energy synchronization harvesting interface circuit and the operating voltage of the load.

[0120] In this step, the controller can obtain the voltage values ​​of each capacitor in the energy synchronization harvesting interface circuit and the operating voltage of the load as operating parameters. The voltage values ​​of each capacitor in the energy synchronization harvesting interface circuit include the voltage value of the first capacitor Cin1 and the voltage value of the second capacitor Cin2. When the load is a battery, the operating voltage of the load refers to the current voltage of the battery; when the load is a power-consuming device, the operating voltage of the load refers to the rated operating voltage of the load, which can be selected according to the specific scenario.

[0121] In step 102, the operating mode of the energy synchronization harvesting interface circuit is determined based on the voltage values ​​of each capacitor in the energy synchronization harvesting interface circuit.

[0122] In one example, the controller can determine the operating mode of the energy synchronization harvesting interface circuit based on the voltage values ​​of each capacitor within the circuit. See [link to relevant documentation]. Figure 11The process includes: In step 111, the controller can obtain a first magnitude relationship between the voltage value of each capacitor and its respective voltage threshold. The controller can obtain the voltage thresholds of the first capacitor Cin1 and the second capacitor Cin2, and then compare the first capacitor Cin1 and its voltage threshold and the second capacitor Cin2 and its voltage threshold to obtain the first magnitude relationship. It is understood that the first capacitor Cin1 and the second capacitor Cin2 each correspond to a first magnitude relationship. In step 112, when the first magnitude relationship indicates that the voltage value of at least one capacitor is less than its respective voltage threshold, the controller can determine that the operating mode of the energy synchronization harvesting interface circuit is a first operating mode, in which the first AC ambient energy harvester and the second AC ambient energy harvester are time-division multiplexed for power supply; in step 113, when the first magnitude relationship indicates that the voltage value of each capacitor is greater than or equal to its respective voltage threshold, the controller can determine that the operating mode of the energy synchronization harvesting interface circuit is a second operating mode, in which the first AC ambient energy harvester and the second AC ambient energy harvester are connected in series for synchronous power supply.

[0123] In step 103, the output voltage of the energy synchronization harvesting interface circuit is controlled according to the operating mode and the operating voltage of the load, wherein the output voltage is greater than or equal to the operating voltage of the load.

[0124] In this step, the controller can control the output voltage of the energy synchronous harvesting interface circuit according to the operating mode and the operating voltage of the load. (See also...) Figure 12 This includes: In step 121, the controller can determine the target switching frequency of the fifth switching switch in the energy synchronous harvesting interface circuit under this operating mode based on the operating voltage of the load. In step 122, the controller can control the energy conversion circuit in the energy synchronous harvesting interface circuit according to this operating mode, and simultaneously control the fifth switching switch S5 to be turned on or off according to the target switching frequency, so as to control the output voltage of the energy synchronous harvesting interface circuit to be greater than or equal to the operating voltage of the load.

[0125] In this embodiment, the environmental energy harvesting system can be controlled to switch between the aforementioned first and second operating states. For example, when the ambient energy is weak, the first AC environmental energy harvester 11 and / or the second AC environmental energy harvester 12 harvests environmental energy slowly. In this case, the system switches to the first operating state, utilizing the AC environmental energy harvester that harvests environmental energy relatively quickly to provide power, while the other AC environmental energy harvester first charges the capacitor, and then supplies power when the capacitor is fully charged. Alternatively, when the ambient energy is strong, the first AC environmental energy harvester 11 and the second AC environmental energy harvester 12 harvest environmental energy quickly. In this case, the system switches to the second operating state, utilizing both AC environmental energy harvesters to supply power simultaneously, which can improve the instantaneous output voltage and power. Furthermore, when the load is a battery, the second operating mode can be used to charge the battery initially; when the battery reaches a preset voltage, the system switches to the first operating mode to charge, improving charging efficiency. Also, when the load's operating voltage is low, the output voltage of the second operating mode may be higher than the load's operating voltage. In this case, the system switches to the first operating mode to supply power, thereby ensuring the load operates normally.

[0126] Figure 13 This is a block diagram illustrating an electronic device according to an exemplary embodiment. For example, the electronic device 1300 may be a smartphone, computer, digital broadcasting terminal, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0127] The electronic device may include Figures 1-9 In addition to the structure shown, refer to Figure 13 The electronic device 1300 may include one or more of the following components: processing component 1302, memory 1304, power supply component 1306, multimedia component 1308, audio component 1310, input / output (I / O) interface 1312, sensor component 1314, communication component 1316, and image acquisition component 1318.

[0128] Processing component 1302 typically controls the overall operation of electronic device 1300, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 1302 may include one or more processors 1320 to execute computer programs. Furthermore, processing component 1302 may include one or more modules to facilitate interaction between processing component 1302 and other components. For example, processing component 1302 may include a multimedia module to facilitate interaction between multimedia component 1308 and processing component 1302. In one example, the processing component may include a controller that includes a processor for performing the methods described above.

[0129] Memory 1304 is configured to store various types of data to support the operation of electronic device 1300. Examples of such data include computer programs for any application or method operating on electronic device 1300, contact data, phone book data, messages, pictures, videos, etc. Memory 1304 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0130] Power supply component 1306 provides power to various components of electronic device 1300. Power supply component 1306 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 1300. Power supply component 1306 may also be an environmental energy harvesting system as described above, to collect environmental parameters to power a battery.

[0131] Multimedia component 1308 includes a screen that provides an output interface between electronic device 1300 and target object. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input information from the target object. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation.

[0132] Audio component 1310 is configured to output and / or input audio file information. For example, audio component 1310 includes a microphone (MIC) configured to receive external audio file information when electronic device 1300 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio file information may be further stored in memory 1304 or transmitted via communication component 1316. In some embodiments, audio component 1310 also includes a speaker for outputting audio file information.

[0133] I / O interface 1312 provides an interface between processing component 1302 and peripheral interface modules, such as keyboards, click wheels, buttons, etc.

[0134] Sensor assembly 1314 includes one or more sensors for providing state assessments of various aspects of electronic device 1300. For example, sensor assembly 1314 can detect the on / off state of electronic device 1300, the relative positioning of components (e.g., the display screen and keypad of electronic device 1300), changes in position of electronic device 1300 or a component, the presence or absence of contact between a target object and electronic device 1300, the orientation or acceleration / deceleration of electronic device 1300, and temperature changes of electronic device 1300. In this example, sensor assembly 1314 may include magnetic sensors, gyroscopes, and magnetic field sensors, and may also include inertial sensors, image sensors, etc., wherein the magnetic field sensor includes at least one of the following: a Hall sensor, a thin-film magnetoresistive sensor, and a magnetic fluid accelerometer.

[0135] Communication component 1316 is configured to facilitate wired or wireless communication between electronic device 1300 and other devices. Electronic device 1300 can access wireless networks based on communication standards, such as WiFi, 2G, 3G, 4G, 5G, or combinations thereof. In one exemplary embodiment, communication component 1316 receives broadcast information or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 1316 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0136] In an exemplary embodiment, the electronic device 1300 may be implemented by one or more application-specific integrated circuits (ASICs), digital information processors (DSPs), digital information processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0137] In an exemplary embodiment, a non-transitory computer-readable storage medium is also provided, which enables the implementation of the method described above when an executable computer program in the storage medium is executed by a processor.

[0138] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of this disclosure. This disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0139] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An ambient energy harvesting system, characterized by, The application relates to an energy synchronous collection interface circuit and a controller. The first AC ambient energy collector is electrically connected with the energy synchronous collection interface circuit, and is used for converting collected first ambient energy into an AC voltage and providing the AC voltage to the energy synchronous collection interface circuit. The second AC ambient energy collector is electrically connected with the energy synchronous collection interface circuit, and is used for converting collected second ambient energy into an AC voltage and providing the AC voltage to the energy synchronous collection interface circuit. The controller is electrically connected with the energy synchronous collection interface circuit, and is used for adjusting the working mode of the energy synchronous collection interface circuit and controlling the output voltage of the energy synchronous collection interface circuit, wherein the output voltage is greater than or equal to the working voltage of a load. The first AC ambient energy collector is used for collecting one of the following ambient energies: light energy, temperature difference energy, vibration energy or radio frequency energy; the second AC ambient energy collector is used for collecting one of the following ambient energies: light energy, temperature difference energy, vibration energy or radio frequency energy; and the ambient energies collected by the first AC ambient energy collector and the second AC ambient energy collector are different.

2. The ambient energy harvesting system of claim 1, wherein, The energy synchronous collection interface circuit comprises an energy conversion circuit, a shared inductor and a switching circuit; the energy conversion circuit is electrically connected with the first AC ambient energy collector, the second AC ambient energy collector, the shared inductor and the controller respectively; and the switching circuit is electrically connected with the shared inductor, the controller and a load respectively.

3. The ambient energy harvesting system of claim 1, wherein, The energy conversion circuit is used for converting AC into DC according to the control signal of the controller, and providing the DC to the shared inductor. The switching circuit is used for controlling the shared inductor to charge or discharge according to the control signal of the controller. The energy conversion circuit comprises a first rectifier bridge, a second rectifier bridge and a mode switching unit; the input end of the first rectifier bridge is electrically connected with the output end of the first AC ambient energy collector; the output end of the first rectifier bridge is electrically connected with the input end of the mode switching unit; the input end of the second rectifier bridge is electrically connected with the output end of the second AC ambient energy collector; the output end of the second rectifier bridge is electrically connected with the input end of the mode switching unit; the mode switching unit is electrically connected with the controller and the first end of the shared inductor respectively; and the second end of the shared inductor is grounded.

4. The ambient energy harvesting system of claim 3, wherein, The first rectifier bridge is used for converting the AC provided by the first AC ambient energy collector into DC, and providing the DC to the mode switching unit. The second rectifier bridge is used for converting the AC provided by the second AC ambient energy collector into DC, and providing the DC to the mode switching unit. The mode switching unit is used for controlling the DC of the first rectifier bridge and the second rectifier bridge to be output in time division or in series according to the control signal of the controller. ​ 5. The ambient energy harvesting system of claim 4, wherein, The mode switching unit comprises a first capacitor, a second capacitor, a first charging switch, a second charging switch, a first switching switch, a second switching switch, a third switching switch and a fourth switching switch; The first end of the first charging switch is electrically connected to the first input end of the mode switching unit, the second end of the first charging switch is electrically connected to the second end of the first switching switch and the first end of the first capacitor respectively, and the control end of the first charging switch is electrically connected to the controller; The first end of the second charging switch is electrically connected to the third input end of the mode switching unit, the second end of the second charging switch is electrically connected to the second end of the third switching switch and the first end of the second capacitor respectively, and the control end of the second charging switch is electrically connected to the controller; The first end of the first switching switch is electrically connected to the first end of the second switching switch and the first output end of the mode switching unit respectively, and the control end of the first switching switch is electrically connected to the controller; The second end of the second switching switch is electrically connected to the second end of the first capacitor, the second input end of the mode switching unit, the first end of the third switching switch and the first end of the fourth switching switch respectively, and the control end of the second switching switch is electrically connected to the controller; The second end of the fourth switching switch is electrically connected to the second end of the second capacitor and the fourth input end of the mode switching unit respectively and grounded.

6. The ambient energy harvesting system of claim 3, wherein, The switch circuit comprises a fifth switching switch, the first end of the fifth switching switch is electrically connected to the first output end of the energy conversion circuit, the second end of the fifth switching switch is grounded, and the control end of the fifth switching switch is electrically connected to the controller; The fifth switching switch is used for switching to the conducting state when the control signal is received, and switching to the open state when the control signal is not received; The shared inductor is used for charging when the fifth switching switch switches to the conducting state and discharging when the fifth switching switch switches to the open state.

7. The ambient energy harvesting system of claim 3, wherein, The energy synchronous collection interface circuit further comprises a freewheeling diode, the first end of the freewheeling diode is electrically connected to the first end of the shared inductor, and the second end of the freewheeling diode is electrically connected to the load.

8. The ambient energy harvesting system of claim 7, wherein, The energy synchronous collection interface circuit further comprises an output capacitor, the first end of the output capacitor is electrically connected to the second end of the freewheeling diode, and the second end of the output capacitor is grounded.

9. A method of ambient energy harvesting, the method comprising: comprises: acquiring working parameters, the working parameters comprising voltage values of each capacitor in the energy synchronous collection interface circuit and working voltage of the load; The energy stored in each capacitor is provided by the first and second alternating environment energy collectors; determining the working mode of the energy synchronous collection interface circuit according to the voltage values of each capacitor in the energy synchronous collection interface circuit; controlling the output voltage of the energy synchronous collection interface circuit according to the working mode and the working voltage of the load, the output voltage being greater than or equal to the working voltage of the load.

10. The method of claim 9, wherein, determining the working mode of the energy synchronous collection interface circuit according to the voltage values of each capacitor in the energy synchronous collection interface circuit, comprises: acquire a first size relationship between voltage values of each capacitor and respective voltage threshold values; determine a working mode of the energy synchronous harvesting interface circuit as a first working mode when the first size relationship indicates that there is at least one capacitor whose voltage value is less than the respective voltage threshold value, in which the first alternating environment energy harvester and the second alternating environment energy harvester are time-multiplexed for power supply in the first working mode; determine the working mode of the energy synchronous harvesting interface circuit as a second working mode when the first size relationship indicates that each capacitor has a voltage value greater than or equal to the respective voltage threshold value, in which the first alternating environment energy harvester and the second alternating environment energy harvester are series-synchronized for power supply in the second working mode.

11. The method of claim 9, wherein, control an output voltage of the energy synchronous harvesting interface circuit according to the working mode and a working voltage of the load, including: determine a target switching frequency of a fifth switching switch in the energy synchronous harvesting interface circuit according to the working voltage of the load in the working mode; control the output voltage of the energy synchronous harvesting interface circuit to be greater than or equal to the working voltage of the load by controlling an energy conversion circuit in the energy synchronous harvesting interface circuit according to the working mode and controlling the fifth switching switch to be turned on or off according to the target switching frequency.

12. An electronic device, comprising: an environment energy harvesting system as claimed in any one of claims 1 to 8; a controller of the environment energy harvesting system includes a processor and a memory; the memory is configured to store a computer program executable by the processor; the processor is configured to execute the computer program in the memory to implement the method as claimed in any one of claims 9 to 11.

13. A non-transitory computer-readable storage medium, comprising: the executable computer program in the storage medium, when executed by the processor, can implement the method as claimed in any one of claims 9 to 11.

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