CN216312977U - Energy acquisition circuit and pressure power generation device - Google Patents

Abstract

The embodiment of the utility model provides an energy acquisition circuit and a pressure power generation device, wherein the energy acquisition circuit comprises a rectifier bridge, a switching circuit, a first power supply output circuit, a control circuit and a signal transmitter, wherein the first end and the second end of the rectifier bridge are connected with a power supply, the third end of the rectifier bridge is connected with the first end of the switching circuit, and the fourth end of the rectifier bridge is grounded; the rectifier bridge comprises a first diode; the first power supply output circuit comprises a first inductor, a second diode and a first capacitor, and a first end of the first inductor and a negative electrode of the second diode are connected with a second end of the switch circuit; the anode of the second diode is grounded; the second end of the first inductor and the first end of the first capacitor are connected with the control circuit; the second end of the first capacitor is grounded; the control circuit is connected with the signal emitter, so that the energy collection utilization rate can be improved.

Description

Energy acquisition circuit and pressure power generation device

Technical Field

The utility model relates to the technical field of electronics, in particular to an energy acquisition circuit and a pressure power generation device.

Background

The existing pressure generating device and energy collecting circuit have many insufficient places, such as the problems of insufficient structure, high cost, low collecting efficiency and the like, and the problems of high cost, poor reliability and low energy output cause that products can not be normally used in the using process.

Disclosure of Invention

The embodiment of the utility model provides an energy acquisition circuit and a pressure power generation device, which can improve the energy acquisition utilization rate.

A first aspect of an embodiment of the present invention provides an energy harvesting circuit, including: rectifier bridge, switching circuit, first power supply output circuit, control circuit and signal transmitter, wherein,

the first end and the second end of the rectifier bridge are connected with a power supply, the third end of the rectifier bridge is connected with the first end of the switch circuit, and the fourth end of the rectifier bridge is grounded; the rectifier bridge comprises a first diode;

the first power supply output circuit comprises a first inductor, a second diode and a first capacitor, and a first end of the first inductor and a negative electrode of the second diode are connected with a second end of the switch circuit; the anode of the second diode is grounded; the second end of the first inductor and the first end of the first capacitor are connected with the control circuit; the second end of the first capacitor is grounded; the control circuit is connected with the signal transmitter.

Optionally, the switch circuit includes a first transistor M1, a drain of the first transistor is connected to the third terminal of the rectifier bridge; the source electrode of the first transistor is connected with the first end of the first inductor and the cathode of the second diode; the grid electrode of the first transistor is connected with the control circuit.

Optionally, the energy harvesting circuit further comprises a second inductance L2; the first end of the second inductor is connected with the first end of the rectifier bridge; and the second end of the second inductor is connected with a power supply.

Optionally, the control circuit comprises a first switch CN1, a first control chip IC 1; wherein,

the first switch is connected with the grid electrode of the first transistor and a third pin of the control circuit;

a first pin of the first control chip is connected with a second end of the first inductor and a first end of the first capacitor;

the second pin of the first control chip is also connected with the signal transmitter.

Optionally, the control circuit further includes an eighth capacitor, and a first end of the eighth capacitor is connected to the fourth pin of the first control chip; and the second end of the eighth capacitor is grounded.

Optionally, the energy harvesting circuit further includes a first resistor, a second transistor, a third diode, a third inductor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; wherein,

the first end of the third capacitor, the third end of the rectifier bridge and the drain electrode of the first transistor are connected with the control circuit; the second end of the third capacitor is grounded; the first end of the fifth capacitor, the first end of the sixth capacitor, the drain electrode of the second transistor, the second end of the first inductor and the first end of the first capacitor are connected with the control circuit;

a second end of the fifth capacitor and a second end of the sixth capacitor are grounded;

the grid electrode of the second transistor is connected with the control circuit; the source electrode of the second transistor and the cathode of the third diode are connected with the first end of the third inductor; the anode tube of the third diode is grounded; the second end of the third inductor, the first end of the fourth capacitor and the first end of the first resistor are connected with the control circuit; the second end of the fourth capacitor and the second end of the first resistor are grounded.

Optionally, the control circuit comprises a first sensor S1, a second sensor S2, a third sensor S3 and a fourth sensor S4; the control circuit further comprises a second resistor, a third resistor, a fourth resistor and a fifth resistor; the control circuit further comprises a second capacitor, a first comparator, a second comparator and a third comparator; the control circuit further comprises a first logic gate and a second logic gate; wherein,

the first end of the third capacitor, the third end of the rectifier bridge and the drain electrode of the first transistor are connected with the first end of the first sensor S1; a second end of the first sensor S1 is grounded; the third end of the first sensor S1 is connected with the first end of the third resistor;

the second end of the third resistor and the first end of the fourth resistor are connected with the positive input end of the first comparator; a second end of the fourth resistor is grounded; the first end of the second resistor and the first end of the fifth resistor are connected with the negative input end of the first comparator; the second end of the fifth resistor is connected with the first end of the second capacitor; the second end of the second capacitor and the output end of the first comparator are connected with the first input end of the first logic gate; a second input end of the first logic gate is grounded; the output end of the first logic gate is connected with the grid electrode of the first transistor;

a second end of the second resistor is connected with a first end of the second sensor S2; the third end of the second sensor S2 is grounded; the first end of the fifth capacitor, the first end of the sixth capacitor, the source of the second transistor, the second end of the first inductor, the first end of the first capacitor, and the second end of the second sensor S2 are connected to the first end of the fourth sensor S4; a second end of the fourth sensor S4 is grounded; the third end of the fourth sensor S4 is connected with the positive input end of the second comparator; the negative input end of the second comparator is grounded; the output end of the second comparator is connected with the first input end of the second logic gate; a second input end of the second logic gate is connected with an output end of the third comparator; the negative input end of the third comparator is grounded; the positive input end of the third comparator is connected with the first end of the third sensor S3; a second end of the third sensor S3 is grounded;

the grid electrode of the second transistor is connected with the output end of the second logic gate; the second end of the third inductor, the first end of the fourth capacitor and the first end of the first resistor are connected with the third end of the third sensor S3.

A second aspect of embodiments of the present invention provides a pressure power generation device, including the energy harvesting circuit according to the first aspect.

The embodiment of the utility model has at least the following beneficial effects:

it can be seen that, with the energy collection circuit and the pressure power generation device in the embodiments of the present invention, the energy collection circuit includes a rectifier bridge, a switching circuit, a first power supply output circuit, a control circuit, and a signal transmitter, a first end and a second end of the rectifier bridge are connected to a power supply, a third end of the rectifier bridge is connected to a first end of the switching circuit, and a fourth end of the rectifier bridge is grounded; the rectifier bridge comprises a first diode; the first power supply output circuit comprises a first inductor, a second diode and a first capacitor, and a first end of the first inductor and a negative electrode of the second diode are connected with a second end of the switch circuit; the anode of the second diode is grounded; the second end of the first inductor and the first end of the first capacitor are connected with the control circuit; the second end of the first capacitor is grounded; the control circuit is connected with the signal transmitter, the energy acquisition circuit adopts a nonlinear energy acquisition mode of electric energy-magnetic energy-electric energy, more electric energy can be converted into magnetic energy, then the magnetic energy can be accurately released to be used immediately, voltage and current can be released, no redundant energy consumption exists in the whole acquisition and use link, a chip cannot be started when the voltage is low, energy loss in a reset state does not exist, nonlinear energy conversion does not exist when the electric charge potential is high, a high-potential charge part is not converted into heat energy and then supplied to the low-potential chip for use, and therefore the energy acquisition utilization rate can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an energy harvesting circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating an example of the use of energy provided to a control circuit according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of an energy harvesting circuit according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a portion of another energy harvesting circuit according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by the person skilled in the art that the described embodiments of the utility model can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an energy harvesting circuit according to an embodiment of the present invention, where the energy harvesting circuit includes: rectifier bridge BD1, a switching circuit, a first power supply output circuit, a control circuit and a signal transmitter U1, wherein,

the first end and the second end of the rectifier bridge are connected with a power supply, the third end of the rectifier bridge is connected with the first end of the switch circuit, and the fourth end of the rectifier bridge is grounded; the rectifier bridge comprises a first diode D1;

the first power supply output circuit comprises a first inductor L1, a second diode D2 and a first capacitor C1, wherein a first end of the first inductor L1 and a negative electrode of the second diode D2 are connected with a second end of the switch circuit; the anode of the second diode D2 is grounded; the second end of the first inductor L1 and the first end of the first capacitor C1 are connected with the control circuit; the second end of the first capacitor C1 is grounded; the control circuit is connected with the signal transmitter U1.

The embodiment of the utility model can be applied to the application fields of household appliances, lights, remote controllers, internet of things, outdoor environment monitoring and the like, the energy acquisition circuit can be a remote controller or electronic equipment in other product forms, for example, when the energy acquisition circuit is a remote controller, the remote controller can comprise keys, a user can send a control instruction to external equipment in wireless connection with the remote controller through the keys of the remote controller, and the external equipment can be household appliances, outdoor environment monitoring equipment and the like, and the utility model is not limited.

The power supply is connected to the energy harvesting circuit through a first input terminal IN1 and a second input terminal IN2, specifically, the first input terminal IN1 and the second input terminal IN2 may be respectively connected to a first terminal and a second terminal of a rectifier bridge, the power supplied by the power supply is connected to the rectifier bridge through a first input terminal IN1 and a second input terminal IN2, and the rectifier bridge includes a first diode D1.

Wherein, the rectifier bridge can be a germanium tube rectifier bridge.

The electric energy reaches the first inductor L1 of the first power supply output circuit after being rectified by the first diode D1.

The switching circuit may include a first transistor M1 for collecting energy from pressure and controlling the on-time and frequency of collecting weak energy. After the first transistor M1 is turned on, the first inductor L1 is charged with energy, rectified by the second diode D2, and then transferred to the first capacitor C1. After the first transistor M1 is turned off, the first inductor L1, the second diode D2 and the first capacitor C1 form a first power supply output circuit, and the first inductor L1 continues to supply energy to the first capacitor C1. After certain energy is accumulated on the first capacitor C1, the energy is provided for the control circuit to work, the control circuit can collect the energy, and when the energy collected by the control circuit is accumulated to a specified value, the control circuit detects information of a key or a sensor; after the information of the keys or the sensors is collected, the information of the keys or the sensors is transmitted out through the signal transmitter, and the data transmission without the batteries is completed.

Specifically, when the first transistor M1 is turned on, the first transistor M1 converts all the electric energy from the rectifier bridge to magnetic energy in the first inductor L1, and when the first transistor is turned off, the magnetic energy in the first inductor L1 releases electric energy, and the electric energy is output to the first capacitor C1 through the second diode D2 in a unidirectional manner, and the first capacitor C1 accumulates charges, so that the electric energy generated by piezoelectric is converted into magnetic energy to the greatest extent possible, and then the electric energy is released. The energy thus collected is more than 2 times more than the energy collected by using a capacitor alone, and in one example, the effect of the collection is as compared with fig. 2. As shown in fig. 2, the horizontal axis represents the time length of the energy supplied to the control circuit, and the time length of the energy supplied to the control circuit is finally increased from 3.5ms to 7ms, that is, the effective energy is increased by 200%, so that the inductor has the function of follow current conversion, the electric energy output power is greatly increased, and the energy collection utilization rate can be increased.

Optionally, the switch circuit comprises a first transistor M1, and a drain of the first transistor M1 is connected to the third terminal of the rectifier bridge; the source electrode of the first transistor is connected with the first end of the first inductor and the cathode of the second diode D2; the grid electrode of the first transistor is connected with the control circuit.

Optionally, the energy harvesting circuit further comprises a second inductance L2; a first end of the second inductor L2 is connected with a first end of the rectifier bridge; the second end of the second inductor L2 is connected to a power supply.

Optionally, the control circuit comprises a first switch CN1, a first control chip IC 1; wherein,

the first switch CN1 connects the gate of the first transistor M1 and the third pin of the control circuit;

a first pin of the first control chip is connected with a second end of the first inductor and a first end of the first capacitor;

the second pin of the first control chip is also connected with the signal transmitter.

Optionally, the control circuit further includes an eighth capacitor, and a first end of the eighth capacitor is connected to the fourth pin of the first control chip; and the second end of the eighth capacitor is grounded.

As shown in fig. 3, fig. 3 is a schematic structural diagram of another energy harvesting circuit according to an embodiment of the present invention, wherein the switching circuit may include a first transistor M1 for harvesting energy coming from a pressure and controlling the on-time and frequency of harvesting weak energy. After the first transistor M1 is turned on, the first inductor L1 is charged with energy, rectified by the second diode D2, and then transferred to the first capacitor C1. After the first transistor M1 is turned off, the first inductor L1, the second diode D2 and the first capacitor C1 form a first power supply output circuit, and the first inductor L1 continues to supply energy to the first capacitor C1. After certain energy is accumulated on the first capacitor C1, the energy is supplied to the first control chip IC1 to work, the energy is collected to the eighth capacitor C8, and when the energy collected by the eighth capacitor C8 is accumulated to a specified value, the first control chip IC1 detects key or sensor information; after the information of the keys or the sensors is collected, the information of the keys or the sensors is transmitted out through a signal transmitter U1, and the data transmission without the battery is completed.

Optionally, as shown in fig. 4, the energy harvesting circuit further includes a first resistor R1, a second transistor M2, a third diode D3, a third inductor L3, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; wherein,

the first end of the third capacitor C3, the third end of the rectifier bridge and the drain electrode of the first transistor M1 are connected with the control circuit; the second end of the third capacitor is grounded; the first end of the fifth capacitor, the first end of the sixth capacitor C6, the drain of the second transistor, the second end of the first inductor and the first end of the first capacitor are connected with the control circuit;

a second terminal of the fifth capacitor C5 and a second terminal of the sixth capacitor are grounded;

the gate of the second transistor M2 is connected with the control circuit; the source electrode of the second transistor and the cathode of the third diode are connected with the first end of the third inductor; the anode tube of the third diode is grounded; the second end of the third inductor, the first end of the fourth capacitor and the first end of the first resistor are connected with the control circuit; the second end of the fourth capacitor and the second end of the first resistor are grounded.

Optionally, the control circuit comprises a first sensor S1, a second sensor S2, a third sensor S3 and a fourth sensor S4; the control circuit further comprises a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; the control circuit further includes a second capacitor C2, a first comparator AMP1, a second comparator AMP2, and a third comparator AMP 3; the control circuit further comprises a first logic gate Y1, a second logic gate Y2; wherein,

the first end of the third capacitor C3, the third end of the rectifier bridge and the drain of the first transistor M1 are connected with the first end of the first sensor S1; a second end of the first sensor S1 is grounded; the third end of the first sensor S1 is connected with the first end of the third resistor;

the second end of the third resistor R3 and the first end of the fourth resistor R4 are connected with the positive input end of the first comparator; a second end of the fourth resistor R4 is grounded; the first end of the second resistor and the first end of the fifth resistor are connected with the negative input end of the first comparator; the second end of the fifth resistor is connected with the first end of the second capacitor; the second end of the second capacitor C2 and the output end of the first comparator are connected with the first input end of the first logic gate; a second input end of the first logic gate is grounded; the output end of the first logic gate is connected with the grid electrode of the first transistor;

a second end of the second resistor is connected with a first end of the second sensor S2; the third end of the second sensor S2 is grounded; the first end of the fifth capacitor, the first end of the sixth capacitor, the source of the second transistor, the second end of the first inductor, the first end of the first capacitor, and the second end of the second sensor S2 are connected to the first end of the fourth sensor S4; a second end of the fourth sensor S4 is grounded; the third end of the fourth sensor S4 is connected with the positive input end of the second comparator; the negative input end of the second comparator is grounded; the output end of the second comparator is connected with the first input end of the second logic gate; a second input end of the second logic gate is connected with an output end of the third comparator; the negative input end of the third comparator is grounded; the positive input end of the third comparator is connected with the first end of the third sensor S3; a second end of the third sensor S3 is grounded;

the grid electrode of the second transistor is connected with the output end of the second logic gate; the second end of the third inductor, the first end of the fourth capacitor and the first end of the first resistor are connected with the third end of the third sensor S3.

The control circuit may be integrated in a second control chip, and the second control chip may be an MCU.

And the third inductor, the third diode and the fourth capacitor form a second power supply output circuit.

Referring to fig. 4, fig. 4 is a circuit schematic diagram of another energy harvesting circuit according to an embodiment of the present invention. The AC is an alternating current voltage source, voltage waveforms generated when similar pressing is output, the sixth resistor R6 is the internal resistance of the alternating current voltage source, the seventh capacitor C7 is further connected to two ends of the alternating current voltage source, and the first sensor S1 behind the rectifier bridge BD1 is a voltage signal sensor. The first power supply output circuit collects energy input by the alternating current voltage source to a first capacitor C1; the second power supply output circuit is used for supplying power to the first resistor, and the first resistor is used as a load resistor.

The second sensor S2 is a storage capacitor voltage sensor, when S2 monitors that energy can be used for the control circuit to work, the second comparator AMP2 outputs high level to start the chip to work, the third sensor S3 is a third comparator AMP3 which compares the output voltage sensor with the appointed working voltage to obtain a difference value, a pulse width modulation PWM signal is calculated according to the difference value, then the PWM signal is output to the second transistor M2 to start the second power supply output circuit, the working voltage appointed by the control circuit is output, and the control circuit is started to work.

The working time of the output energy is prolonged by using a 2-level voltage control mode, in one example, the working time of the output energy is prolonged to 15ms, the effective energy is increased by 200% again by using a single-level 7ms, and the usable energy is 400% more than that of the energy collected by a direct capacitor, so that the energy collection utilization rate can be improved.

When a finger presses the piezoelectric piece, the piezoelectric piece deforms to generate electric energy, after rectification by the rectifier bridge, the first transistor M1 is in a conducting state to charge the first inductor L1 after T1 time, the first transistor M1 is turned off, the magnetic energy is released to generate electric energy with specified potential energy, and the first capacitor C1 is charged through the second diode D2. So when repeating a section, when electric energy on first electric capacity C1 progressively accumulates appointed voltage, control circuit began to start work, and control circuit scans the button key value earlier, scans the key value after, starts signal transmitter, and the key value of pressing the button is passed through signal transmitter and is launched, and after receiving this key value data, just opened or closed corresponding lamp, the action of accomplishing a wireless switch machine.

The embodiment of the present invention further provides a pressure power generation apparatus, wherein the remote controller includes an energy collection circuit shown in fig. 1, 3, and 4, and the energy collection circuit includes: rectifier bridge, switching circuit, first power supply output circuit, control circuit and signal transmitter, wherein,

the first end and the second end of the rectifier bridge are connected with a power supply, the third end of the rectifier bridge is connected with the first end of the switch circuit, and the fourth end of the rectifier bridge is grounded; the rectifier bridge comprises a first diode;

the first power supply output circuit comprises a first inductor, a second diode and a first capacitor, and a first end of the first inductor and a negative electrode of the second diode are connected with a second end of the switch circuit; the anode of the second diode is grounded; the second end of the first inductor and the first end of the first capacitor are connected with the control circuit; the second end of the first capacitor is grounded; the control circuit is connected with the signal transmitter.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus can be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention are explained herein by using specific embodiments, which are merely used to help understand the present invention and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (8)

1. An energy harvesting circuit, comprising: rectifier bridge, switching circuit, first power supply output circuit, control circuit and signal transmitter, wherein,

the first end and the second end of the rectifier bridge are connected with a power supply, the third end of the rectifier bridge is connected with the first end of the switch circuit, and the fourth end of the rectifier bridge is grounded; the rectifier bridge comprises a first diode;

the first power supply output circuit comprises a first inductor, a second diode and a first capacitor, and a first end of the first inductor and a negative electrode of the second diode are connected with a second end of the switch circuit; the anode of the second diode is grounded; the second end of the first inductor and the first end of the first capacitor are connected with the control circuit; the second end of the first capacitor is grounded; the control circuit is connected with the signal transmitter.

2. The energy harvesting circuit of claim 1, wherein the switching circuit comprises a first transistor, a drain of the first transistor is connected to a third terminal of the rectifier bridge; the source electrode of the first transistor is connected with the first end of the first inductor and the cathode of the second diode; the grid electrode of the first transistor is connected with the control circuit.

3. The energy harvesting circuit of claim 2, further comprising a second inductance L2; the first end of the second inductor is connected with the first end of the rectifier bridge; and the second end of the second inductor is connected with a power supply.

4. The energy harvesting circuit of claim 3, wherein the control circuit comprises a first switch, a first control chip; wherein,

the first switch is connected with the grid electrode of the first transistor and a third pin of the control circuit;

a first pin of the first control chip is connected with a second end of the first inductor and a first end of the first capacitor;

the second pin of the first control chip is also connected with the signal transmitter.

5. The energy harvesting circuit of claim 4, wherein the control circuit further comprises an eighth capacitor, a first end of the eighth capacitor is connected to the fourth pin of the first control chip; and the second end of the eighth capacitor is grounded.

6. The energy harvesting circuit of claim 5, further comprising a first resistor, a second transistor, a third diode, a third inductor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; wherein,

the first end of the third capacitor, the third end of the rectifier bridge and the drain electrode of the first transistor are connected with the control circuit; the second end of the third capacitor is grounded; the first end of the fifth capacitor, the first end of the sixth capacitor, the drain electrode of the second transistor, the second end of the first inductor and the first end of the first capacitor are connected with the control circuit;

a second end of the fifth capacitor and a second end of the sixth capacitor are grounded;

the grid electrode of the second transistor is connected with the control circuit; the source electrode of the second transistor and the cathode of the third diode are connected with the first end of the third inductor; the anode tube of the third diode is grounded; the second end of the third inductor, the first end of the fourth capacitor and the first end of the first resistor are connected with the control circuit; the second end of the fourth capacitor and the second end of the first resistor are grounded.

7. The energy harvesting circuit of claim 6, wherein the control circuit comprises a first sensor, a second sensor, a third sensor, and a fourth sensor; the control circuit further comprises a second resistor, a third resistor, a fourth resistor and a fifth resistor; the control circuit further comprises a second capacitor, a first comparator, a second comparator and a third comparator; the control circuit further comprises a first logic gate and a second logic gate; wherein,

the first end of the third capacitor, the third end of the rectifier bridge and the drain electrode of the first transistor are connected with the first end of the first sensor; a second end of the first sensor is grounded; the third end of the first sensor is connected with the first end of the third resistor;

the second end of the third resistor and the first end of the fourth resistor are connected with the positive input end of the first comparator; a second end of the fourth resistor is grounded; the first end of the second resistor and the first end of the fifth resistor are connected with the negative input end of the first comparator; the second end of the fifth resistor is connected with the first end of the second capacitor; the second end of the second capacitor and the output end of the first comparator are connected with the first input end of the first logic gate; a second input end of the first logic gate is grounded; the output end of the first logic gate is connected with the grid electrode of the first transistor;

the second end of the second resistor is connected with the first end of the second sensor; the third end of the second sensor is grounded; the first end of the fifth capacitor, the first end of the sixth capacitor, the source electrode of the second transistor, the second end of the first inductor, the first end of the first capacitor and the second end of the second sensor are connected with the first end of the fourth sensor; a second end of the fourth sensor is grounded; the third end of the fourth sensor is connected with the positive input end of the second comparator; the negative input end of the second comparator is grounded; the output end of the second comparator is connected with the first input end of the second logic gate; a second input end of the second logic gate is connected with an output end of the third comparator; the negative input end of the third comparator is grounded; the positive input end of the third comparator is connected with the first end of the third sensor; a second end of the third sensor is grounded;

the grid electrode of the second transistor is connected with the output end of the second logic gate; the second end of the third inductor, the first end of the fourth capacitor and the first end of the first resistor are connected with the third end of the third sensor S3.

8. A pressure generating device comprising an energy harvesting circuit according to any of claims 1-7.

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