CN115833337A

CN115833337A - Piezoelectric energy collecting circuit capable of comprehensively optimizing power

Info

Publication number: CN115833337A
Application number: CN202211479386.XA
Authority: CN
Inventors: 夏桦康; 方斌; 陈国柱; 夏银水; 叶益迭; 张义
Original assignee: Ningbo University
Current assignee: Ningbo University
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-03-21

Abstract

The invention discloses a piezoelectric energy collecting circuit capable of carrying out power comprehensive optimization, which comprises a piezoelectric transducer, a self-powered SSHI-VD type MPPT rectifying circuit, a self-adaptive charging management circuit and a rechargeable battery, wherein in a cold start working stage, the self-powered SSHI-VD type MPPT rectifying circuit charges an energy storage device in a passive voltage doubling rectifying mode, in an efficient collecting working stage, the self-powered SSHI-VD type MPPT rectifying circuit charges the energy storage device in an active synchronous switch inductance voltage doubling rectifying mode, when the voltage on the energy storage device exceeds an optimal value, the self-powered SSHI-VD type MPPT rectifying circuit controls partial electric energy in the energy storage device to be released into an electric energy temporary storage device for temporary storage, and when the voltage on the electric energy temporary storage device exceeds a discharging threshold value, the self-adaptive charging management circuit transfers the electric energy in the electric energy temporary storage device to the rechargeable battery; the advantage is when having higher rectification efficiency, can trail the maximum power point and can carry out self-adaptation charge management, and charge management efficiency is higher.

Description

Piezoelectric energy collecting circuit capable of comprehensively optimizing power

Technical Field

The invention relates to a piezoelectric energy collecting circuit, in particular to a piezoelectric energy collecting circuit capable of comprehensively optimizing power.

Background

Piezoelectric energy collection is a vibration energy collection mode with wide application prospect, and compared with other vibration energy collection modes such as magnetoelectric mode and electrostatic mode, the piezoelectric energy collection device has the outstanding advantages of large energy density, high electromechanical conversion efficiency, easiness in micro-electromechanical integration and the like. The piezoelectric transducer can convert environmental vibration into alternating current voltage with certain amplitude and frequency to be output, and the piezoelectric energy collecting circuit can rectify and convert the alternating current voltage output by the piezoelectric transducer and the like, and finally converts the alternating current voltage into direct current which can be utilized by the microelectronic equipment to be stored. Piezoelectric transducers are currently conventional devices, and once the specifications of the piezoelectric transducers are determined, the piezoelectric energy harvesting performance is mainly determined by the piezoelectric energy harvesting circuits.

At present, the research focus of piezoelectric energy collecting circuits mainly focuses on the aspects of a rectifying circuit topology structure, a maximum power point tracking control method, a charging management strategy and the like. The chinese patent No. ZL201610841067.7 discloses a piezoelectric vibration energy collection system based on maximum power point tracking, which performs bidirectional regulation on load voltage of a conventional full-bridge rectifier circuit through a Buck-Boost cascade bidirectional DC-DC converter, so as to realize maximum power point tracking for piezoelectric energy collection, but the conventional full-bridge rectifier circuit is adopted, so that the rectification efficiency is low, and in addition, frequent startup of the DC-DC converter in the piezoelectric vibration energy collection system also causes more power loss, so that the overall working efficiency is limited. Although a self-powered SSHI type AC-DC rectifier in the piezoelectric vibration energy collection system has higher rectification efficiency compared with a conventional full-bridge rectification circuit, and the proposed maximum power point tracking method can also ensure that the rectification circuit works in an optimal state, the self-powered SSHI type AC-DC rectifier is a passive circuit based on a triode, a large phase lag exists on piezoelectric peak detection, the input of piezoelectric energy is reduced, and meanwhile, as a double-switch Buck-Boost type DC-DC converter in the piezoelectric vibration energy collection system is directly connected with a rectification filter capacitor, the double-switch Buck-Boost type DC-DC converter is frequently started to cause more power loss in the maximum power point tracking control process, and finally the charging management efficiency is low.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a piezoelectric energy collecting circuit capable of performing power comprehensive optimization, wherein the piezoelectric energy collecting circuit has higher rectification efficiency, can track a maximum power point, can perform self-adaptive charging management and has higher charging management efficiency.

The technical scheme adopted by the invention for solving the technical problems is as follows: a piezoelectric energy collecting circuit capable of carrying out power comprehensive optimization comprises a piezoelectric transducer, a self-powered SSHI-VD type MPPT rectifying circuit, a self-adaptive charging management circuit and a rechargeable battery, wherein the piezoelectric transducer is used for converting vibration energy into alternating-current voltage to be output; the self-powered SSHI-VD type MPPT rectification circuit is internally provided with an energy storage device and an electric energy temporary storage device, the electric energy which can be stored by the electric energy temporary storage device is more than 10 times of the electric energy which can be stored by the energy storage device, and the self-powered SSHI-VD type MPPT rectification circuit has two different working stages of cold start and high-efficiency collection; when no external independent power supply supplies power, and the energy storage device cannot supply power, the self-powered SSHI-VD type MPPT rectifying circuit is in a power-down forbidden state, the self-powered SSHI-VD type MPPT rectifying circuit firstly enters the cold start working stage for accumulating electric energy, and when the electric energy is accumulated to be capable of working normally, the self-powered SSHI-VD type MPPT rectifying circuit is switched to the high-efficiency collection working stage from the cold start working stage; when an external independent power supply or the energy storage device supplies power, the self-powered SSHI-VD type MPPT rectifying circuit is in a power-on working state, and the self-powered SSHI-VD type MPPT rectifying circuit can directly enter the high-efficiency collection working stage; in the cold starting working stage, the self-powered SSHI-VD type MPPT rectifying circuit converts alternating current voltage input into the piezoelectric transducer into direct current voltage in a passive voltage-multiplying rectifying mode, and charges the energy storage device to increase the voltage of the energy storage device; in the high-efficiency collection working stage, the self-powered SSHI-VD type MPPT rectifying circuit converts alternating current voltage input into the piezoelectric transducer into direct current voltage in an active synchronous switch inductance voltage-multiplying rectifying mode, and charges the energy storage device to increase the voltage of the energy storage device; meanwhile, the self-powered SSHI-VD type MPPT rectifying circuit monitors and regulates the voltage on the energy storage device, when the voltage on the energy storage device exceeds an optimal value, the self-powered SSHI-VD type MPPT rectifying circuit controls partial electric energy in the energy storage device to be released to the electric energy temporary storage device for temporary storage, so that the voltage loaded on the energy storage device is maintained near the optimal value, and the maximum power point tracking of piezoelectric energy collection is realized; the self-adaptive charging management circuit monitors the voltage on the electric energy temporary storage device, and when the voltage on the electric energy temporary storage device exceeds a preset discharging threshold value, the self-adaptive charging management circuit transfers the electric energy in the electric energy temporary storage device to the rechargeable battery for storage, so that self-adaptive charging management is realized.

Piezoelectric transducer have first output and second output, self-powered SSHI-VD type MPPT rectifier circuit have first input, second input, first output and second output, self-adaptation charge management circuit have first input, second input, first output and second output, rechargeable battery have positive pole and negative pole, piezoelectric transducer's first output with self-powered SSHI-VD type MPPT rectifier circuit's first input connect, piezoelectric transducer's the third inputThe second output end of the self-powered SSHI-VD type MPPT rectifying circuit is connected with the second input end of the self-powered SSHI-VD type MPPT rectifying circuit, the first output end of the self-powered SSHI-VD type MPPT rectifying circuit is connected with the first input end of the self-adaptive charging management circuit, the second output end of the self-powered SSHI-VD type MPPT rectifying circuit is connected with the second input end of the self-adaptive charging management circuit, the first output end of the self-adaptive charging management circuit is connected with the anode of the rechargeable battery, and the second output end of the self-adaptive charging management circuit is connected with the cathode of the rechargeable battery; the alternating voltage output by the first output end of the piezoelectric transducer is recorded as V _p1 The alternating voltage output by the second output end of the piezoelectric transducer is recorded as V _p2 Will convert the AC voltage V _p2 Is denoted as V _p2,peak The total voltage on the energy storage device is marked as V _r Recording the voltage on the temporary electric energy storage device as V _tem Recording the minimum power supply voltage capable of enabling the self-powered SSHI-VD type MPPT rectification circuit to normally work as +/-V _cc The charging action triggering threshold voltage of the self-adaptive charging management circuit is recorded as V _trig (ii) a When the cold start working phase begins, the energy storage device and the electric energy temporary storage device do not store electric energy, and the voltage V is _r And V _tem Are all zero; after the cold start working stage begins, the self-powered SSHI-VD type MPPT rectifying circuit charges the energy storage device to enable V to be in a V shape _r Increase when V _r When the self-powered SSHI-VD type MPPT rectification circuit can normally work, the self-powered SSHI-VD type MPPT rectification circuit enters the high-efficiency collection working stage; in the high-efficiency collection working stage, the self-powered SSHI-VD type MPPT rectifying circuit charges the energy storage device to enable V to be in a voltage-current ratio _r Continuing to increase; when V is _r When the maximum power point of the self-powered SSHI-VD type MPPT rectifying circuit is increased to be larger than the optimal rectifying voltage corresponding to the maximum power point, the self-powered SSHI-VD type MPPT rectifying circuit starts to control the energy storage device to discharge so as to charge the electric energy temporary storage device, and V is _r Decrease of V _tem Increasing; when V is _r Is reduced to less thanWhen the optimal rectification voltage corresponding to the maximum power point is reached, the self-powered SSHI-VD type MPPT rectification circuit stops controlling the energy storage device to discharge; when V is _tem Increase to V or more _trig When the rechargeable battery is charged, the self-adaptive charging management circuit controls the electric energy temporary storage device to discharge to charge the rechargeable battery, at the moment, the electric energy of the rechargeable battery is increased, and V is _tem Decrease; when V is _tem When the voltage is reduced to zero, the self-adaptive charging management circuit stops controlling the discharge of the electric energy temporary storage device; under the charging action of the self-powered SSHI-VD type MPPT rectifying circuit, the electric energy temporary storage device can be charged to V again _trig And then, discharging is carried out through the self-adaptive charging management circuit, and the steps are repeated in a circulating way.

The self-powered SSHI-VD type MPPT rectification circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a first PMOS tube, a second PMOS tube, a first NMOS tube and a first comparator, wherein the first comparator is provided with a non-inverting input end, an inverting input end, a power supply positive end, a power supply negative end and an output end, the third capacitor and the fourth capacitor are energy storage devices of the self-powered SSHI-VD type MPPT rectification circuit, the sixth capacitor is an electric energy temporary storage device of the self-powered SSHI-VD type MPPT rectifier circuit, the capacitance value of the sixth capacitor is more than 10 times that of the third capacitor and the fourth capacitor, one end of the first capacitor, the anode of the third diode and the cathode of the fourth diode are connected, the connection end of the first capacitor is the first input end of the self-powered SSHI-VD type MPPT rectifier circuit, the other end of the first capacitor and one end of the first resistor are connected with the non-inverting input end of the first comparator, the other end of the first resistor and one end of the second capacitor are connected with the inverting input end of the first comparator, and the output end of the first comparator and the output end of the third comparator are connected with the inverting input end of the first comparatorOne end of a second resistor, a gate of the first PMOS transistor and a gate of the first NMOS transistor are connected, the other end of the second capacitor, the other end of the second resistor, one end of the first inductor and one end of the third resistor are connected, and a connection end thereof is a second input end of the self-powered SSHI-VD MPPT rectifier circuit, the other end of the first inductor, a cathode of the first diode and an anode of the second diode are connected, an anode of the first diode and a drain of the first PMOS transistor are connected, a cathode of the second diode and a drain of the first NMOS transistor are connected, the other end of the third resistor, an anode of the fifth diode and one end of the fourth resistor are connected, a cathode of the fifth diode, one end of the fifth capacitor, one end of the fifth resistor and a gate of the second PMOS transistor are connected, the negative electrode of the third diode, one end of the third capacitor, the source electrode of the second PMOS transistor and the positive power supply terminal of the first comparator are connected, the drain electrode of the second PMOS transistor and one end of the sixth capacitor are connected, the connection end of the second PMOS transistor and one end of the sixth capacitor is the first output end of the self-powered SSHI-VD MPPT rectifier circuit, one end of the fourth capacitor, the positive electrode of the fourth diode, the other end of the sixth capacitor and the negative power supply terminal of the first comparator are connected, the connection end of the fourth PMOS transistor and the other end of the sixth capacitor is the second output end of the self-powered SSHI-VD MPPT rectifier circuit, the source electrode of the first PMOS transistor, the source electrode of the first NMOS transistor, the other end of the third capacitor, the other end of the fourth resistor, the second output end of the self-powered SSHI-VD MPPT rectifier circuit, and the second output end of the self-powered MPPT circuit, the other end of the fifth capacitor and the other end of the fifth resistor are both grounded. In the self-powered SSHI-VD type MPPT rectifying circuit, a peak value detection circuit is formed by a first capacitor, a second capacitor, a first resistor and a first comparator, a third capacitor and a fourth capacitor respectively provide positive and negative working power supplies for the first comparator, and a passive peak value tracking circuit is formed by a third resistor, a fourth resistor, a fifth capacitor and a fifth diode; during a cold start operation phase, the first comparator is not started due to lack of stable power supply, the first comparator is not startedThe inductor, the second resistor, the first diode, the second diode, the third diode, the fourth diode, the first PMOS tube, the first NMOS tube, the third capacitor and the fourth capacitor are used as a passive voltage doubling rectifying circuit, the third capacitor and the fourth capacitor are charged, and passive cold start of the self-powered SSHI-VD type MPPT rectifying circuit is achieved; in the high-efficiency collection working stage, the first comparator starts to work, the first inductor, the second resistor, the first diode, the second diode, the third diode, the fourth diode, the first PMOS tube, the first NMOS tube, the third capacitor and the fourth capacitor form an SSHI-VD type rectifying circuit, and the third capacitor and the fourth capacitor are charged to realize the high-efficiency work of the self-powered SSHI-VD type MPPT rectifying circuit; meanwhile, the passive peak tracking circuit conducts on and off control on the second PMOS tube through voltage monitoring and controls the third capacitor and the fourth capacitor to discharge to the sixth capacitor, so that the voltages on the third capacitor and the fourth capacitor are controlled to be maintained near an optimal value, and maximum power point tracking of piezoelectric energy collection is achieved; v _tem Is the voltage across the sixth capacitor, + V _cc Is the design voltage, -V of the positive supply terminal of the first comparator _cc The design voltage of the negative end of the power supply of the first comparator, and the total voltage V on the third capacitor and the fourth capacitor _r The voltage on the third capacitor is +0.5V _r The voltage on the fourth capacitor is-0.5V _r The third capacitor and the fourth capacitor provide a positive power supply and a negative power supply for the first comparator at the same time, the piezoelectric transducer, the third diode, the third capacitor, the first PMOS tube, the first diode and the first inductor form a positive LC resonance loop, the piezoelectric transducer, the fourth diode, the fourth capacitor, the first NMOS tube, the second diode and the first inductor form a negative LC resonance loop, voltage turnover factors of the positive LC resonance loop and the negative LC resonance loop are equal and are recorded as gamma, and the preset discharge threshold value is equal to (1-gamma) × V _p2,peak And the self-powered SSHI-VD type MPPT rectification circuit adopts a simple and reliable circuit structure to realize the electric energy accumulation in the cold start working stage and the high-efficiency work in the high-efficiency collection working stage.

The self-adaptive charging management circuit comprises a sixth resistor, a seventh resistor and a fourth resistorThe self-adaptive charge management circuit comprises an eight resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second NMOS tube, a third PMOS tube, a sixth diode, a seventh capacitor, a second inductor, a second comparator and a DC-DC converter, wherein the second comparator is provided with a non-inverting input end, an inverting input end, a reference voltage end, a positive power supply end, a negative power supply end, an output end and a common end, the DC-DC converter is provided with an input end, an enable end, a common end, a switch node end and an output end, one end of the sixth resistor, one end of the eleventh resistor, a source electrode of the third PMOS tube are connected with the positive power supply end of the second comparator, the connection end of the sixth resistor is the first input end of the self-adaptive charge management circuit, and the other end of the sixth resistor, one end of the seventh resistor and the non-inverting input end of the second comparator are connected, one end of the eighth resistor, one end of the ninth resistor, and one end of the second inductor are connected to the input terminal of the DC-DC converter, the other end of the ninth resistor are connected to the reference voltage terminal of the second comparator, the output terminal of the second comparator is connected to the positive electrode of the sixth diode, the negative electrode of the sixth diode, one end of the seventh capacitor, one end of the tenth resistor, and the gate of the second NMOS transistor are connected to the gate of the third NMOS transistor, the other end of the eleventh resistor, the gate of the third PMOS transistor, and the drain of the third PMOS transistor, one end of the twelfth resistor, and one end of the second inductor are connected to the input terminal of the DC-DC converter, the other end of the second inductor is connected with a switch node end of the DC-DC converter, the other end of the twelfth resistor is connected with an enable end of the DC-DC converter, an output end of the DC-DC converter is a first output end of the adaptive charge management circuit, the other end of the seventh resistor, the other end of the eighth resistor, a source electrode of the second NMOS transistor, a power supply negative terminal and a common terminal of the second comparator, the other end of the seventh capacitor, the other end of the tenth resistor, and the other end of the seventh capacitorThe source electrode of the three NMOS tubes is connected with the common end of the DC-DC converter, and the connecting ends are the second input end and the second output end of the self-adaptive charging management circuit at the same time; in the self-adaptive charging management circuit, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second NMOS tube, a third PMOS tube, a sixth diode, a seventh capacitor and a second comparator form an energy release circuit, and the charging action of the energy release circuit triggers a threshold voltage V _trig The voltage regulator is determined by a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and the internal reference voltage of the second comparator; when the input voltage between the first input end and the second input end of the self-adaptive charging management circuit is lower than the set energy release action trigger threshold voltage, the third NMOS tube and the third PMOS tube are both turned off, and the input voltage cannot enter the DC-DC converter, so that the rear-stage rechargeable battery cannot be charged; when the input voltage reaches the threshold voltage V triggered by the charging action _trig When the rechargeable battery is charged, the third NMOS tube and the third PMOS tube are both conducted, and the input voltage can enter the DC-DC converter to charge the rechargeable battery; the self-adaptive charging management circuit obtains the set charging action trigger threshold voltage V by adjusting the resistance values of the sixth resistor, the seventh resistor, the eighth resistor and the ninth resistor _trig The charging management requirements under different scenes can be met, power loss caused by frequent starting of the DC-DC converter is avoided, and the charging management method has the advantage of efficient self-adaptive charging.

Compared with the prior art, the self-powered SSHI-VD type MPPT rectification circuit has the advantages that the self-powered SSHI-VD type MPPT rectification circuit, the self-adaptive charging management circuit and the rechargeable battery are arranged, an energy storage device and an electric energy temporary storage device are arranged in the self-powered SSHI-VD type MPPT rectification circuit, the electric energy which can be stored by the electric energy temporary storage device is more than 10 times of the electric energy which can be stored by the energy storage device, and the self-powered SSHI-VD type MPPT rectification circuit has two different working stages of cold start and high-efficiency collection; when no external independent power supply supplies power, and the energy storage device cannot supply power, the self-powered SSHI-VD type MPPT rectification circuit is in a power-down forbidden state, the self-powered SSHI-VD type MPPT rectification circuit firstly enters a cold start working stage to accumulate electric energy, and when the electric energy is accumulated to be capable of working normally, the self-powered SSHI-VD type MPPT rectification circuit is switched to an efficient collection working stage from the cold start working stage; when an external independent power supply or an energy storage device supplies power, the self-powered SSHI-VD type MPPT rectifying circuit is in a power-on working state, and the self-powered SSHI-VD type MPPT rectifying circuit can directly enter a high-efficiency collection working stage; in a cold starting working stage, the self-powered SSHI-VD type MPPT rectifying circuit converts alternating current voltage input into the self-powered SSHI-VD type MPPT rectifying circuit by a passive voltage doubling rectifying mode into direct current voltage, and charges an energy storage device to increase the voltage of the energy storage device; in the high-efficiency collection working stage, the self-powered SSHI-VD type MPPT rectifying circuit converts alternating current voltage input into the piezoelectric transducer into direct current voltage in an active synchronous switch inductance voltage-multiplying rectifying mode, and charges an energy storage device to increase the voltage of the energy storage device; meanwhile, the self-powered SSHI-VD type MPPT rectifying circuit monitors and regulates the voltage on the energy storage device, when the voltage on the energy storage device exceeds an optimal value, the self-powered SSHI-VD type MPPT rectifying circuit controls partial electric energy in the energy storage device to be released into an electric energy temporary storage device for temporary storage, so that the voltage loaded on the energy storage device is maintained near the optimal value, and the maximum power point tracking of piezoelectric energy collection is realized; the self-adaptive charging management circuit monitors the voltage on the electric energy temporary storage device, and when the voltage on the electric energy temporary storage device exceeds a preset discharging threshold value, the self-adaptive charging management circuit transfers the electric energy in the electric energy temporary storage device to a rechargeable battery for storage, so that self-adaptive charging management is realized.

Drawings

FIG. 1 is a block diagram of the overall circuit architecture of a piezoelectric energy harvesting circuit capable of power synthesis optimization in accordance with the present invention;

FIG. 2 is a circuit diagram of a self-powered SSHI-VD MPPT rectifier circuit of a piezoelectric energy harvesting circuit capable of power synthesis optimization in accordance with the present invention;

FIG. 3 is a circuit diagram of an adaptive charge management circuit for a piezoelectric energy harvesting circuit capable of power integration optimization in accordance with the present invention;

fig. 4 is a voltage simulation waveform diagram of the piezoelectric transducer, the energy storage device and the electric energy temporary storage device of the piezoelectric energy collection circuit capable of performing power comprehensive optimization.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The first embodiment is as follows: as shown in fig. 1, a piezoelectric energy harvesting circuit capable of performing power comprehensive optimization includes a piezoelectric transducer PZT for converting vibration energy into an alternating voltage for output, and further includes a self-powered SSHI-VD MPPT rectifying circuit 1, an adaptive charge management circuit 2, and a rechargeable battery BAT; the self-powered SSHI-VD type MPPT rectification circuit 1 is internally provided with an energy storage device and an electric energy temporary storage device, the electric energy which can be stored by the electric energy temporary storage device is more than 10 times of the electric energy which can be stored by the energy storage device, and the self-powered SSHI-VD type MPPT rectification circuit 1 has two different working stages of cold start and efficient collection; when no external independent power supply supplies power, and the energy storage device cannot supply power, the self-powered SSHI-VD type MPPT rectification circuit 1 is in a power failure forbidden state, the self-powered SSHI-VD type MPPT rectification circuit 1 firstly enters a cold start working stage to accumulate electric energy, and when the electric energy is accumulated to be capable of working normally, the self-powered SSHI-VD type MPPT rectification circuit 1 is switched to an efficient collection working stage from the cold start working stage; when an external independent power supply or an energy storage device supplies power, the self-powered SSHI-VD type MPPT rectifying circuit 1 is in a power-on working state, and the self-powered SSHI-VD type MPPT rectifying circuit 1 can directly enter a high-efficiency collection working stage; in the cold starting working stage, the self-powered SSHI-VD type MPPT rectifying circuit 1 converts alternating current voltage input into a piezoelectric transducer PZT into direct current voltage in a passive voltage-multiplying rectifying mode, and charges an energy storage device to increase the voltage of the energy storage device; in the high-efficiency collection working stage, the self-powered SSHI-VD type MPPT rectification circuit 1 converts alternating current voltage input into a piezoelectric transducer PZT into direct current voltage in an active synchronous switch inductance voltage-multiplying rectification mode, and charges an energy storage device to increase the voltage of the energy storage device; meanwhile, the self-powered SSHI-VD type MPPT rectifying circuit 1 monitors and regulates the voltage on the energy storage device, when the voltage on the energy storage device exceeds an optimal value, the self-powered SSHI-VD type MPPT rectifying circuit 1 controls partial electric energy in the energy storage device to be released into an electric energy temporary storage device for temporary storage, so that the voltage loaded on the energy storage device is maintained near the optimal value (the optimal value is +/-100 mV), and the maximum power point tracking of piezoelectric energy collection is realized, wherein the optimal value is determined by the open-circuit voltage of the piezoelectric transducer PZT; the adaptive charging management circuit 2 monitors the voltage of the electric energy temporary storage device, and when the voltage of the electric energy temporary storage device exceeds a preset discharging threshold, the adaptive charging management circuit 2 transfers the electric energy in the electric energy temporary storage device to the rechargeable battery BAT for storage, so that adaptive charging management is realized.

In this embodiment, the piezoelectric transducer PZT has a first output end and a second output end, the self-powered SSHI-VD MPPT rectifying circuit 1 has a first input end, a second input end, a first output end and a second output end, the adaptive charging management circuit 2 has a first input end, a second input end, a first output end and a second output end, the rechargeable battery BAT has a positive electrode and a negative electrode, the first output end of the piezoelectric transducer PZT is connected with the first input end of the self-powered SSHI-VD MPPT rectifying circuit 1, the second output end of the piezoelectric transducer is connected with the second input end of the self-powered SSHI-VD MPPT rectifying circuit 1, the first output end of the self-powered SSHI-VD MPPT rectifying circuit 1 is connected with the first input end of the adaptive charging management circuit 2, the second output end of the self-powered SSHI-VD MPPT rectifying circuit 1 is connected with the second input end of the adaptive charging management circuit 2, the first output end of the adaptive charging management circuit 2 is connected with the positive electrode of the battery charger, and the second output end of the adaptive charging management circuit 2 is connected with the negative electrode of the rechargeable battery BAT; the alternating voltage output by the first output end of the piezoelectric transducer PZT is recorded as V _p1 Let V be the AC voltage output by the second output terminal of the piezoelectric transducer PZT _p2 Will convert the AC voltage V _p2 Is denoted as V _p2,peak The total voltage across the energy storage device is denoted as V _r The voltage on the temporary storage device is recorded as V _tem The self-powered SSHI-VD MPPT rectifier circuit 1 can normally workMinimum supply voltage is noted as + -V _cc The charging action trigger threshold voltage of the adaptive charging management circuit 2 is recorded as V _trig (ii) a When the working stage of cold start is started, the energy storage device and the electric energy temporary storage device have no electric energy storage, and the voltage V is _r And V _tem Are all zero; after the cold start working stage begins, the self-powered SSHI-VD type MPPT rectifying circuit 1 charges the energy storage device to enable V _r Increase when V _r When the power supply SSHI-VD type MPPT rectification circuit 1 can normally work, the power supply SSHI-VD type MPPT rectification circuit 1 enters a high-efficiency collection working stage; in the high-efficiency collection working stage, the self-powered SSHI-VD type MPPT rectifying circuit 1 charges the energy storage device to enable V _r Continuing to increase; when V is _r When the voltage is increased to be larger than the optimal rectification voltage corresponding to the maximum power point, the self-powered SSHI-VD type MPPT rectification circuit 1 starts to control the discharge of the energy storage device to charge the electric energy temporary storage device, and V _r Decrease of V _tem Increasing; when Vr is reduced to be less than or equal to the optimal rectification voltage corresponding to the maximum power point, the self-powered SSHI-VD type MPPT rectification circuit 1 stops controlling the energy storage device to discharge; when V is _tem Increase to V or more _trig When the rechargeable battery BAT is charged, the adaptive charge management circuit 2 controls the discharge of the electric energy temporary storage device to charge the rechargeable battery BAT, and at the moment, the electric energy of the rechargeable battery BAT is increased, V _tem Decrease; when V is _tem When the voltage is reduced to zero, the self-adaptive charging management circuit 2 stops controlling the electric energy temporary storage device to discharge; under the charging action of the self-powered SSHI-VD type MPPT rectifying circuit 1, the electric energy temporary storage device can be charged to V again _trig Then, the self-adaptive charging management circuit 2 discharges the electric charges, and the operation is repeated in cycles.

Example two: this embodiment is substantially the same as the first embodiment, except that: as shown in fig. 2, in the present embodiment, the self-powered SSHI-VD MPPT rectifier circuit 1 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a first inductor L1, a first PMOS transistor PM1, a second PMOS transistor PM2, a first NMOS transistor NM1, and a first comparator U1, where the first comparator U1 has a non-inverting input terminal, an inverting input terminal, a positive power terminal, a negative power terminal, and an output terminal, the third capacitor C3 and the fourth capacitor C4 are energy storage devices of the self-powered SSHI-VD MPPT rectifier circuit 1, the sixth capacitor C6 is an electric energy storage device of the self-powered ssvd-VD temporary MPPT rectifier circuit 1, the capacitance value of the sixth capacitor C6 is more than 10 times of the capacitance values of the third capacitor C3 and the fourth capacitor C4, one end of the first capacitor C1, the anode of the third diode D3 and the cathode of the fourth diode D4 are connected, the connection end of the first capacitor C1 is the first input end of the self-powered SSHI-VD type MPPT rectification circuit 1, the other end of the first capacitor C1, one end of the first resistor R1 and one end of the second capacitor C2 are connected with the non-inverting input end of the first comparator U1, the output end of the first comparator U1, one end of the second resistor R2, the grid of the first PMOS tube PM1 and the grid of the first NMOS tube NM1 are connected, the other end of the second capacitor C2, the other end of the second resistor R2, one end of the first inductor L1 and one end of the third resistor R3 are connected, and the connection end of the second input end of the self-powered SSVD-type MPPT rectification circuit 1 is the second input end of the self-powered SSVD-type MPPT rectification circuit 1, the other end of the first inductor L1, the cathode of the first diode D1 and the anode of the second diode D2 are connected, the anode of the first diode D1 and the drain of the first PMOS transistor PM1 are connected, the cathode of the second diode D2 and the drain of the first NMOS transistor NM1 are connected, the other end of the third resistor R3, the anode of the fifth diode D5 and one end of the fourth resistor R4 are connected, the cathode of the fifth diode D5, one end of the fifth capacitor C5, one end of the fifth resistor R5 and the gate of the second PMOS transistor PM2 are connected, the cathode of the third diode D3, one end of the third capacitor C3, the source of the second PMOS transistor PM2 and the positive power supply terminal of the first comparator U1 are connected, the drain of the second PMOS transistor PM2 and one end of the sixth capacitor C6 are connected, the connection terminal of the third diode D3 is the first output terminal of the self-powered ssvd-VD rectifier circuit 1, the one end of the fourth capacitor D4, the anode of the fourth diode D4, the drain of the sixth capacitor C6 and the negative terminal of the first capacitor C1 are connected, the third output terminal of the self-VD-type rectifier circuit 1, the other end of the first self-PMOS transistor PM 4 is connected to the negative power supply terminal of the first capacitor U1, the other end of the second capacitor, the third capacitor C5, the other end of the third capacitor.

In the self-powered SSHI-VD MPPT rectifier circuit 1 of this embodiment, a first capacitor C1, a second capacitor C2, a first resistor R1, and a first comparator U1 constitute a peak detection circuit, a third capacitor C3 and a fourth capacitor C4 respectively provide a positive working power supply and a negative working power supply for the first comparator U1, and a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fifth capacitor C5, and a fifth diode D5 constitute a passive peak tracking circuit; in a cold start working stage, the first comparator U1 does not start working due to lack of stable electric energy supply, the first inductor L1, the second resistor R2, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the first PMOS tube PM1, the first NMOS tube NM1, the third capacitor C3 and the fourth capacitor C4 are used as passive voltage-multiplying rectification circuits to charge the third capacitor C3 and the fourth capacitor C4, and passive cold start of the self-powered SSHI-VD type MPPT rectification circuit 1 is realized; in the efficient collection working stage, the first comparator U1 starts to work, the first inductor L1, the second resistor R2, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the first PMOS tube PM1, the first NMOS tube NM1, the third capacitor C3 and the fourth capacitor C4 form an SSHI-VD type rectifying circuit, the third capacitor C3 and the fourth capacitor C4 are charged, and the efficient work of the self-powered SSHI-VD type MPPT rectifying circuit 1 is achieved; meanwhile, the passive peak tracking circuit conducts on and off control on a second PMOS (P-channel metal oxide semiconductor) tube PM2 through voltage monitoring, and controls the third capacitor C3 and the fourth capacitor C4 to discharge to the sixth capacitor C6, so that the voltages on the third capacitor C3 and the fourth capacitor C4 are controlled to be maintained near an optimal value, and maximum power point tracking of piezoelectric energy collection is realized; v _tem Is the voltage across the sixth capacitor C6, + V _cc Is the design voltage, -V of the positive supply terminal of the first comparator U1 _cc The total voltage V on the third capacitor C3 and the fourth capacitor C4 is the design voltage of the negative terminal of the power supply of the first comparator U1 _r The voltage on the third capacitor C3 is +0.5V _r The voltage on the fourth capacitor C4 is-0.5V _r The third capacitor C3 and the fourth capacitor C4 simultaneously provide the positive power supply and the negative power supply for the first comparator U1The power supply comprises a piezoelectric transducer PZT, a third diode D3, a third capacitor C3, a first PMOS tube PM1, a first diode D1 and a first inductor L1 which form a positive LC resonance circuit, the piezoelectric transducer PZT, a fourth diode D4, a fourth capacitor C4, a first NMOS tube NM1, a second diode D2 and the first inductor L1 form a negative LC resonance circuit, voltage turnover factors of the positive LC resonance circuit and the negative LC resonance circuit are equal and are recorded as gamma, and a preset discharge threshold value is equal to (1-gamma) V1 _p2,peak Is the sign of the multiply operation.

Example three: this embodiment is substantially the same as the second embodiment, except that: as shown in fig. 3, in the present embodiment, the adaptive charge management circuit 2 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second NMOS transistor NM2, a third NMOS transistor NM3, a third PMOS transistor PM3, a sixth diode D6, a seventh capacitor C7, a second inductor L2, a second comparator U2, and a DC-DC converter U3, the second comparator U2 has a non-inverting input terminal, an inverting input terminal, a reference voltage terminal, a positive power supply terminal, a negative power supply terminal, an output terminal, and a common terminal, the DC-DC converter U3 has an input terminal, an enable terminal, a common terminal, a switch node terminal, and an output terminal, one terminal of the sixth resistor R6, one terminal of the eleventh resistor R11, a source of the third PMOS transistor PM3, and the positive power supply terminal of the second comparator U2 are connected, and a connection terminal is a first input terminal of the adaptive charge management circuit 2, the other end of the sixth resistor R6, one end of the seventh resistor R7 and the non-inverting input end of the second comparator U2 are connected, one end of the eighth resistor R8, one end of the ninth resistor R9, the drain of the second NMOS tube NM2 and the inverting input end of the second comparator U2 are connected, the other end of the ninth resistor R9 and the reference voltage end of the second comparator U2 are connected, the output end of the second comparator U2 and the anode of the sixth diode D6 are connected, the cathode of the sixth diode D6, one end of the seventh capacitor C7, one end of the tenth resistor R10, the gate of the second NMOS tube NM2 and the gate of the third NMOS tube NM3 are connected, the other end of the eleventh resistor R11, the gate of the third PMOS tube PM3 and the drain of the third NMOS tube NM3 are connected, the drain of the third PMOS tube PM3, one end of the twelfth resistor R12, one end of the second inductor L2 and the input end of the DC-DC converter U3 are connected, the other end of the second inductor L2 and the switching node of the DC-DC converter U3 are connected, the other end of the twelfth resistor R12 is connected to the enable end of the DC-DC converter U3, the output end of the DC-DC converter U3 is the first output end of the adaptive charge management circuit 2, the other end of the seventh resistor R7, the other end of the eighth resistor R8, the source of the second NMOS transistor NM2, the negative power terminal and the common terminal of the second comparator U2, the other end of the seventh capacitor C7, the other end of the tenth resistor R10, the source of the third NMOS transistor NM3 and the common terminal of the DC-DC converter U3 are connected, and the connection ends are the second input end and the second output end of the adaptive charge management circuit 2.

In this embodiment, the model of the first comparator U1 is TLV3691, the model of the second comparator U2 is LTC1540, and the model of the DC-DC converter U3 is MAX17222.

In the adaptive charge management circuit 2 of the present embodiment, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the second NMOS transistor NM2, the third NMOS transistor NM3, the third PMOS transistor PM3, the sixth diode D6, the seventh capacitor C7, and the second comparator U2 form an energy release circuit, and the charging operation triggers the threshold voltage V _trig The voltage is determined by the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9 and the internal reference voltage of the second comparator U2; when the input voltage between the first input end and the second input end of the adaptive charging management circuit 2 is lower than the set energy release action trigger threshold voltage, the third NMOS transistor NM3 and the third PMOS transistor PM3 are both turned off, and the input voltage cannot enter the DC-DC converter U3, so that the secondary rechargeable battery BAT cannot be charged; when the input voltage reaches the threshold voltage V triggered by the charging action _trig When the rechargeable battery BAT is charged, the third NMOS tube NM3 and the third PMOS tube PM3 are both conducted, and at the moment, the input voltage can enter the DC-DC converter U3; the adaptive charging management circuit 2 obtains the set charging action trigger threshold voltage V by adjusting the resistance values of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 _trig The charging management requirements under different scenes can be met, the power loss caused by frequent starting of the DC-DC converter U3 is avoided, and the charging management method has high efficiencyThe advantage of adaptive charging.

In order to verify the performance of the piezoelectric energy collecting circuit capable of comprehensively optimizing power, the piezoelectric energy collecting circuit capable of comprehensively optimizing power is simulated, wherein simulation parameters are configured as follows: the vibration frequency is 50Hz, the internal capacitance of the piezoelectric transducer PZT is 120nF, the open-circuit output voltage of the piezoelectric transducer PZT is 8V, and the threshold voltage V is triggered by the charging action _trig The capacitance of the inductor is 3V, the sizes of the first capacitor C1 and the second capacitor C2 are both 1nF, the sizes of the third capacitor C3 and the fourth capacitor C4 are both 10 muF, the sizes of the fifth capacitor C5 and the seventh capacitor C7 are both 10nF, the size of the sixth capacitor C6 is 100 muF, the size of the first resistor R1 is 10M omega, the size of the second resistor R2 is 200k omega, the size of the third resistor R3 is 8M omega, the size of the fourth resistor R4 is 1M omega, the size of the fifth resistor R5 is 10M omega, the size of the sixth resistor R6 is 25M omega, the size of the seventh resistor R7 is 5M omega, the sizes of the eighth resistor R8 and the ninth resistor R9 are both 2.5M omega, the sizes of the tenth resistor R10 and the eleventh resistor R11 are both 47M, the size of the twelfth resistor R12 is 33M omega, the size of the first inductor L1 is 200 muH, and the size of the second inductor L2 muH. The voltage simulation wave form diagrams of the piezoelectric transducer PZT, the energy storage device and the electric energy temporary storage device of the piezoelectric energy collecting circuit capable of carrying out power comprehensive optimization are shown in figure 4. As can be seen from fig. 4, when the time t =0s, the voltages of the energy storage device and the electric energy temporary storage device are both 0V, that is, there is no initial energy storage; the stage from t =0s to t =0.4s is a cold start working stage of the self-powered SSHI-VD type MPPT rectifying circuit 1, the self-powered SSHI-VD type MPPT rectifying circuit 1 converts alternating current voltage output by the piezoelectric transducer PZT into direct current voltage in a passive voltage doubling rectifying mode and outputs the direct current voltage to the energy storage device, and therefore voltage V on the energy storage device is enabled to be V _r Slowly increases from 0V to about 0.9V, and the voltage V on the electric energy temporary storage device _tem The voltage is still kept at 0V, meanwhile, the self-powered SSHI-VD type MPPT rectification circuit 1 is powered on and activated, and a high-efficiency collection working stage is started; after time t =0.4s, the high-efficiency collection working stages of the self-powered SSHI-VD type MPPT rectification circuit 1 are all high-efficiency collection working stages, and the self-powered SSHI-VD type MPPT rectification circuit 1 converts alternating-current voltage output by the piezoelectric transducer PZT into direct-current voltage in an active synchronous switch inductance voltage-multiplying rectification modeOutput to the energy storage device to make the voltage V on the energy storage device _r The maximum power point tracking function plays a role in rapidly increasing from 0.9V to about 3V, and the electric energy in the energy storage device is continuously transferred to the electric energy temporary storage device, so that the voltage on the electric energy temporary storage device is continuously increased, and meanwhile, the voltage V on the energy storage device is continuously increased _r Can be always maintained at about 3V; when the voltage on the electric energy temporary storage device rises to the threshold voltage V triggered by the charging action _trig When the self-adaptive charging management circuit 2 starts to discharge the electric energy temporary storage device, the electric energy in the electric energy temporary storage device is transferred to the rechargeable battery BAT for storage, and therefore the voltage V on the electric energy temporary storage device is enabled to be _tem Rapidly reducing the voltage from 3V to about 0V; when V is _tem When the voltage is reduced to about 0V, the self-adaptive charging management circuit 2 stops discharging the electric energy temporary storage device; under the charging action of the SSHI-VD type MPPT rectifying circuit, the electric energy temporary storage device restarts charging until V is reached _trig Then, the self-adaptive charging management circuit 2 discharges the electric charges, and the operation is repeated in cycles. The simulation waveforms shown in fig. 4 completely verify the functions of the self-powered SSHI-VD MPPT rectifier circuit 1 and the adaptive charge management circuit 2, and the piezoelectric energy collection circuit capable of performing power comprehensive optimization of the present invention has correct working logic, can track the maximum power point and perform adaptive charge management while having high rectification efficiency, and has high charge management efficiency.

Claims

1. A piezoelectric energy collecting circuit capable of carrying out power comprehensive optimization comprises a piezoelectric transducer for converting vibration energy into alternating voltage for output, and is characterized by further comprising a self-powered SSHI-VD type MPPT rectifying circuit, a self-adaptive charging management circuit and a rechargeable battery; the self-powered SSHI-VD type MPPT rectification circuit is internally provided with an energy storage device and an electric energy temporary storage device, the electric energy which can be stored by the electric energy temporary storage device is more than 10 times of the electric energy which can be stored by the energy storage device, and the self-powered SSHI-VD type MPPT rectification circuit has two different working stages of cold start and high-efficiency collection; when no external independent power supply supplies power, and the energy storage device cannot supply power, the self-powered SSHI-VD type MPPT rectification circuit is in a power-down forbidden state, the self-powered SSHI-VD type MPPT rectification circuit firstly enters the cold start working stage to accumulate electric energy, and when the electric energy is accumulated to be capable of working normally, the self-powered SSHI-VD type MPPT rectification circuit is switched to the high-efficiency collection working stage from the cold start working stage; when an external independent power supply or the energy storage device supplies power, the self-powered SSHI-VD type MPPT rectifying circuit is in a power-on working state, and the self-powered SSHI-VD type MPPT rectifying circuit can directly enter the high-efficiency collection working stage; in the cold starting working stage, the self-powered SSHI-VD type MPPT rectifying circuit converts alternating current voltage input into the piezoelectric transducer into direct current voltage in a passive voltage-multiplying rectifying mode, and charges the energy storage device to increase the voltage of the energy storage device; in the high-efficiency collection working stage, the self-powered SSHI-VD type MPPT rectifying circuit converts alternating current voltage input into the piezoelectric transducer into direct current voltage in an active synchronous switch inductance voltage-multiplying rectifying mode, and charges the energy storage device to increase the voltage of the energy storage device; meanwhile, the self-powered SSHI-VD type MPPT rectifying circuit monitors and regulates the voltage on the energy storage device, when the voltage on the energy storage device exceeds an optimal value, the self-powered SSHI-VD type MPPT rectifying circuit controls partial electric energy in the energy storage device to be released to the electric energy temporary storage device for temporary storage, so that the voltage loaded on the energy storage device is maintained near the optimal value, and the maximum power point tracking of piezoelectric energy collection is realized; the self-adaptive charging management circuit monitors the voltage on the electric energy temporary storage device, and when the voltage on the electric energy temporary storage device exceeds a preset discharging threshold value, the self-adaptive charging management circuit transfers the electric energy in the electric energy temporary storage device to the rechargeable battery for storage, so that self-adaptive charging management is realized.

2. The piezoelectric energy harvesting circuit for integrated power optimization of claim 1, wherein the piezoelectric transducer is configured to be used in conjunction with a piezoelectric energy harvesting deviceThe self-powered SSHI-VD MPPT rectifier circuit is provided with a first input end, a second input end, a first output end and a second output end, the rechargeable battery is provided with a positive pole and a negative pole, the first output end of the piezoelectric transducer is connected with the first input end of the self-powered SSHI-VD MPPT rectifier circuit, the second output end of the piezoelectric transducer is connected with the second input end of the self-powered SSHI-VD MPPT rectifier circuit, the first output end of the self-powered SSHI-VD MPPT rectifier circuit is connected with the first input end of the self-powered SSHI-VD MPPT rectifier circuit, the second output end of the self-powered SSHI-VD MPPT rectifier circuit is connected with the second input end of the self-powered SSHI-VD MPPT rectifier circuit, the first output end of the self-powered SSHI-VD MPPT rectifier circuit is connected with the positive pole of the rechargeable battery, and the second output end of the self-powered SSHI-VD MPPT rectifier circuit is connected with the negative pole of the rechargeable battery; the alternating voltage output by the first output end of the piezoelectric transducer is recorded as V _p1 The alternating voltage output by the second output end of the piezoelectric transducer is recorded as V _p2 Will convert the AC voltage V _p2 Is denoted as V _p2,peak The total voltage on the energy storage device is marked as V _r Recording the voltage on the temporary electric energy storage device as V _tem The minimum power supply voltage which can enable the self-powered SSHI-VD type MPPT rectification circuit to normally work is recorded as +/-V _cc The charging action triggering threshold voltage of the self-adaptive charging management circuit is recorded as V _trig (ii) a When the cold start working phase begins, the energy storage device and the electric energy temporary storage device do not store electric energy, and the voltage V is _r And V _tem Are all zero; after the cold start working stage begins, the self-powered SSHI-VD type MPPT rectifying circuit charges the energy storage device to enable V to be in a V shape _r Increase when V _r When the power supply SSHI-VD type MPPT rectification circuit can work normally, the self-power supply SSHI-VD type MPPT rectification circuit enters the power supply SSHI-VD type MPPT rectification circuitThe high-efficiency collection working stage of the method; in the high-efficiency collection working stage, the self-powered SSHI-VD type MPPT rectifying circuit charges the energy storage device to enable V to be in a voltage-current ratio _r Continuing to increase; when Vr is increased to be larger than the optimal rectified voltage corresponding to the maximum power point, the self-powered SSHI-VD type MPPT rectifying circuit starts to control the energy storage device to discharge to charge the electric energy temporary storage device, vr is reduced, and Vtem is increased; when Vr is reduced to be less than or equal to the optimal rectification voltage corresponding to the maximum power point, the self-powered SSHI-VD type MPPT rectification circuit stops controlling the energy storage device to discharge; when V is _tem Increase to V or more _trig When the rechargeable battery is charged, the self-adaptive charging management circuit controls the electric energy temporary storage device to discharge to charge the rechargeable battery, at the moment, the electric energy of the rechargeable battery is increased, and V is _tem Decrease; when V is _tem When the voltage is reduced to zero, the self-adaptive charging management circuit stops controlling the discharge of the electric energy temporary storage device; under the charging action of the self-powered SSHI-VD type MPPT rectifying circuit, the electric energy temporary storage device can be charged to V again _trig And then, discharging is carried out through the self-adaptive charging management circuit, and the steps are repeated in a circulating way.

3. The piezoelectric energy harvesting circuit of claim 2, wherein the self-powered SSHI-VD MPPT rectifier circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a first PMOS, a second PMOS, a first NMOS, and a first comparator, the first comparator has a non-inverting input terminal, an inverting input terminal, a positive power terminal, a negative power terminal, and an output terminal, the third capacitor and the fourth capacitor are energy storage devices of the self-powered SSHI-VD MPPT rectifier circuit, and the sixth capacitor is an energy storage device of the self-powered SSHI-VD MPPT rectifier circuit, the capacitance value of the sixth capacitor is more than 10 times that of the third capacitor and the fourth capacitor, one end of the first capacitor, the anode of the third diode and the cathode of the fourth diode are connected, the connection end of the first capacitor is the first input end of the self-powered SSHI-VD type MPPT rectification circuit, the other end of the first capacitor, one end of the first resistor and the other end of the second capacitor are connected with the non-inverting input end of the first comparator, the other end of the first resistor and one end of the second capacitor are connected with the inverting input end of the first comparator, the output end of the first comparator, one end of the second resistor, the grid of the first PMOS tube and the grid of the first NMOS tube are connected, and the other end of the second capacitor, the grid of the second PMOS tube and the grid of the first NMOS tube are connected, the other end of the second resistor, one end of the first inductor and one end of the third resistor are connected, and the connection end of the second resistor, one end of the first inductor and one end of the third resistor are the second input end of the self-powered SSHI-VD MPPT rectifying circuit, the other end of the first inductor, the cathode of the first diode and the anode of the second diode are connected, the anode of the first diode and the drain of the first PMOS transistor are connected, the cathode of the second diode and the drain of the first NMOS transistor are connected, the other end of the third resistor, the anode of the fifth diode and one end of the fourth resistor are connected, the cathode of the fifth diode, one end of the fifth capacitor, one end of the fifth resistor and the gate of the second PMOS transistor are connected, the negative electrode of the third diode, one end of the third capacitor, the source electrode of the second PMOS transistor and the positive power supply terminal of the first comparator are connected, the drain electrode of the second PMOS transistor and one end of the sixth capacitor are connected, the connection end of the second PMOS transistor and one end of the sixth capacitor is the first output end of the self-powered SSHI-VD MPPT rectifier circuit, one end of the fourth capacitor, the positive electrode of the fourth diode, the other end of the sixth capacitor and the negative power supply terminal of the first comparator are connected, the connection end of the fourth capacitor and the negative power supply terminal of the sixth capacitor is the second output end of the self-powered SSHI-VD MPPT rectifier circuit, and the source electrode of the first PMOS transistor, the source electrode of the first NMOS transistor, the other end of the third capacitor, the other end of the fourth resistor, the other end of the fifth capacitor and the other end of the fifth resistor are all grounded.

4. The piezoelectric energy harvesting circuit capable of performing power integration optimization according to claim 3, wherein the adaptive charge management circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second NMOS transistor, a third PMOS transistor, a sixth diode, a seventh capacitor, a second inductor, a second comparator and a DC-DC converter, the second comparator has a non-inverting input terminal, an inverting input terminal, a reference voltage terminal, a positive power terminal, a negative power terminal, an output terminal and a common terminal, the DC-DC converter has an input terminal, an enable terminal, a common terminal, a switch node terminal and an output terminal, one terminal of the sixth resistor, one terminal of the eleventh resistor, a source of the third PMOS transistor and the positive power terminal of the second comparator are connected, and a connection terminal of the adaptive charge management circuit is the first input terminal of the adaptive charge management circuit, the other end of the sixth resistor, one end of the seventh resistor and the non-inverting input terminal of the second comparator are connected, one end of the eighth resistor, one end of the ninth resistor and the drain of the second NMOS transistor are connected to the inverting input terminal of the second comparator, the other end of the ninth resistor and the reference voltage terminal of the second comparator are connected, the output terminal of the second comparator and the anode of the sixth diode are connected, the cathode of the sixth diode, one end of the seventh capacitor, one end of the tenth resistor, the gate of the second NMOS transistor and the gate of the third NMOS transistor are connected, the other end of the eleventh resistor, the gate of the third PMOS transistor and the drain of the third NMOS transistor are connected, the drain of the third PMOS transistor, one end of the twelfth resistor, one end of the second inductor, and the other end of the twelfth resistor are connected to the input end of the DC-DC converter, the other end of the second inductor are connected to the switch node end of the DC-DC converter, the other end of the twelfth resistor is connected to the enable end of the DC-DC converter, the output end of the DC-DC converter is the first output end of the adaptive charge management circuit, the other end of the seventh resistor, the other end of the eighth resistor, the source of the second NMOS transistor, the power supply negative terminal and the common terminal of the second comparator, the other end of the seventh capacitor, the other end of the tenth resistor, the source of the third NMOS transistor, and the common terminal of the DC-DC converter are connected, and the connection end is the second input end and the second output end of the adaptive charge management circuit at the same time.