CN111181442B - Self-adaptive piezoelectric energy collection interface circuit - Google Patents
Self-adaptive piezoelectric energy collection interface circuit Download PDFInfo
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- CN111181442B CN111181442B CN202010076125.8A CN202010076125A CN111181442B CN 111181442 B CN111181442 B CN 111181442B CN 202010076125 A CN202010076125 A CN 202010076125A CN 111181442 B CN111181442 B CN 111181442B
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- 239000003990 capacitor Substances 0.000 claims abstract description 56
- 230000001360 synchronised effect Effects 0.000 claims abstract description 30
- 238000000605 extraction Methods 0.000 claims abstract description 16
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000003044 adaptive effect Effects 0.000 claims description 10
- 230000005669 field effect Effects 0.000 claims description 4
- 238000003306 harvesting Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 230000007306 turnover Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/181—Circuits; Control arrangements or methods
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a self-adaptive piezoelectric energy collection interface circuit, which comprises a synchronous switch extraction module, an active rectifier module, a self-adaptive pulse generation circuit, a digital control circuit and a channel selection and processing module, wherein the synchronous switch extraction module is connected with the active rectifier module; the input end of the synchronous switch extraction module is connected with two ends of the piezoelectric sensor and is simultaneously connected with an external inductor and an external capacitor in sequence; the input end of the active rectifier module is respectively connected with two ends of the piezoelectric sensor, and the output end of the active rectifier module is connected with the output capacitor and the intermittent power management circuit; the self-adaptive pulse generating circuit is connected with the digital control circuit; the channel selection and processing module comprises a bidirectional selector switch for selecting the capacitor, and the output end of the bidirectional selector switch is respectively connected with two ends of the storage capacitor. The invention can effectively reduce the charge loss in the overturning loop, thereby improving the efficiency of piezoelectric energy collection; the invention also multiplexes the capacitor in the flip circuit and the post-stage storage capacitor, thereby reducing the use of the capacitor.
Description
Technical Field
The invention relates to a wireless sensor network, belongs to the field of energy conversion, belongs to the field of integrated circuits, and particularly relates to a self-adaptive piezoelectric energy collection interface circuit.
Background
As wireless sensor networks become more widely used, the development of wireless sensor networks is limited by conventional power supply schemes powered by power sources or batteries. The energy collection technology can collect energy in the natural environment and convert the energy into usable electric energy, so the energy collection technology becomes an important technology for solving the problem of energy supply of the wireless sensor network nodes, wherein piezoelectric energy collection is one of the key solutions for solving the problem of energy supply of the wireless sensor network nodes. In recent years, the research on the piezoelectric energy harvesting interface circuit is in a more intensive trend.
The existing main types of the piezoelectric energy collecting interface circuit comprise standard full-bridge rectification, voltage-doubling rectification, single-switch rectification and other current structures. As shown in fig. 1, the equivalent circuit model of the piezoelectric sensor is a parallel connection of a resistor, a capacitor and a current source. According to the equivalent model of the piezoelectric sensor, in the energy collection process, energy loss can be caused by charging and discharging of the internal capacitor, the efficiency of energy collection is seriously influenced, and the charge of the internal capacitor can be seriously lost by the conventional circuit structure, so that the efficiency of energy collection is not high.
Disclosure of Invention
The invention aims to: the invention provides a self-adaptive piezoelectric energy collection interface circuit, and provides a new solution for the energy supply problem of a wireless sensor network node.
The invention aims to be realized by the following technical scheme:
a self-adaptive piezoelectric energy collection interface circuit is characterized by comprising a synchronous switch extraction module, an active rectifier module, a self-adaptive pulse generation circuit, a digital control circuit and a channel selection and processing module; the input end of the synchronous switch extraction module is connected with two ends of the piezoelectric sensor and is sequentially connected with an external inductor and an external capacitor; the input end of the active rectifier module is respectively connected with two ends of the piezoelectric sensor, and the output end of the active rectifier module is connected with the output capacitor and the intermittent power management circuit; the self-adaptive pulse generating circuit is connected with the digital control circuit; the channel selection and processing module comprises a bidirectional switch for capacitance selection, the input end of the bidirectional switch comprises V S And the output ends of the switch S1 and the switch S2 of the ground and synchronous switch extraction module are respectively connected with two ends of the storage capacitor.
Furthermore, the active rectifier module is composed of two symmetrical partial circuits, each symmetrical circuit comprises a self-biased common-gate comparator with an unbalanced Schmitt inverter, a PMOS and an NMOS; the self-biased common-gate comparator with the unbalanced Schmitt inverter is connected with the unbalanced output end of the self-biased common-gate comparatorAn input of a schmitt inverter; the inputs of the self-biased common-gate comparator are respectively connected with V S And the output of the piezoelectric sensor is respectively connected with the grid of PMOS of the partial circuit and the input of an inverter, and the input of the inverter is connected with NMOS of another symmetrical circuit.
Further, the drains of the PMOS and NMOS of each symmetrical circuit portion are connected to each other and then to one end of the piezoelectric sensor.
Further, the output signal of the self-biased common-gate comparator in the active rectifier module is simultaneously connected to the self-adaptive pulse generating circuit, and a control signal of the synchronous switch loop is generated according to the output signal; meanwhile, the output part of the self-adaptive pulse generating circuit is connected with a digital switching signal generating circuit; the output of the digital switch signal generating circuit is respectively connected with the switch parts of the synchronous switch extraction modules.
Furthermore, the input of the self-adaptive pulse generating circuit is connected with a clock signal formed by a self-biased common-gate comparator in the active rectifier module, and the output of the self-adaptive pulse generating circuit is connected with the self-adaptive pulse generating circuit of the next stage; the output of the self-adaptive pulse generating circuit is connected with an unbalanced Schmidt inverter, and then is connected with an AND gate together with an input signal to generate a pulse signal.
Further, the adaptive pulse generating circuit comprises a comparator, a current source, a capacitor and an inverter; the phase inverter is connected with the grid electrode of a field effect tube, and the drain electrode of the field effect tube is connected with the current source, the output of the equivalent resistance module, the capacitor and one input of the comparator; the other input of the comparator is connected with a reference voltage.
Furthermore, the synchronous switch extraction module comprises four loops formed by two public switch branches, each public switch branch is connected with two branches with choke diodes, and the reverse directions of the choke diodes are opposite; one ends of the two common switches are connected with each other and then connected with the inductor to one end of the piezoelectric sensor; the four current-limiting diodes are connected with each other and then connected to the other end of the piezoelectric sensor.
Furthermore, one end of the common switch is free from inductance and is directly connected to the piezoelectric sensor to form a configuration type SSHC circuit.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts a charge extraction mode of multi-step bias turnover, reduces the loss of an interface circuit and improves the piezoelectric energy collection efficiency.
2. The invention reuses the capacitor in the synchronous switch loop and the storage capacitor at the later stage, thereby reducing the number of the capacitors.
3. The self-adaptive pulse generating circuit can self-adapt to the turnover control signal according to the difference between the piezoelectric sensor and the external inductor, and has greater practicability.
4. The comparator in the active rectifier adopts a common-gate input comparator with an unbalanced Schmitt inverter, so that the input range is wider, and the threshold value of the inverter has the effect of difference inversion.
5. The storage capacitor and the external inductor are integrated on the chip, and the circuit can realize the characteristics of self power supply, cold start, low power consumption and the like.
Drawings
FIG. 1 is an equivalent electrical model of a piezoelectric transducer;
FIG. 2 is a circuit diagram of a synchronous three-step bias flip;
FIG. 3 is a diagram of a one-time flipping process of a synchronous three-step bias flipping circuit;
FIG. 4 is a diagram of a two-shot flip process for a synchronous three-step bias flip circuit;
FIG. 5 is a three-turn process of the synchronous three-step bias-turn circuit;
FIG. 6 is a diagram of the switching pulse sequence and waveforms of the synchronous three-step bias flip-flop;
FIG. 7 is a diagram showing the overall circuit configuration;
FIG. 8 is a common gate input comparator with an unbalanced Schmitt inverter;
FIG. 9 is a block diagram of an adaptive switching pulse generation circuit;
FIG. 10 is a block diagram of a configured SSHC interface circuit;
FIG. 11 is a schematic diagram of a charge sharing stage of a configured SSHC interface circuit;
FIG. 12 is a schematic diagram of a charge removal stage of the configured SSHC interface circuit;
FIG. 13 is a schematic diagram of a charge transfer stage of a configured SSHC interface circuit;
fig. 14 is a waveform diagram of the inversion of the configured SSHC interface circuit.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
The invention provides a self-adaptive piezoelectric energy collection interface circuit based on a multi-step bias turning technology, wherein the multi-step bias turning technology is improved from the original bias turning technology, and the LC resonance multi-step turning of charges of a capacitor in a piezoelectric sensor is carried out by adding an inductor into a switch loop. Meanwhile, the capacitor in the overturning loop is multiplexed with the post-stage storage capacitor, so that the use of the capacitor is reduced.
Referring to fig. 7, the present invention is an adaptive piezoelectric energy harvesting interface circuit, including: the synchronous switch extraction module (S3 BF) is used for overturning the internal capacitance voltage of the piezoelectric sensor;
an Active Rectifier module (Active Rectifier) intended to convert the sensor ac output into a dc output by means of rectification;
an adaptive pulse generating circuit (AFTC) for generating a pulse that varies with the sensor and the external inductance;
digital control circuit, which is used to convert the pulse into the control signal of synchronous switch module through combinational logic.
The input end of the synchronous switch extraction module is connected with two ends of the piezoelectric sensor and is sequentially connected with an external inductor and an external capacitor. The input end of the active rectifier module is respectively connected with two ends of the piezoelectric sensor, and the output end of the active rectifier module is connected with the output capacitor and the intermittent power management circuit. The adaptive pulse generation is connected with the digital control circuit. Synchronous switch module for internal capacitance through piezoelectric sensorForming an LC resonance with the external inductor to invert the voltage of the internal capacitor. The invention realizes the operation mode of multi-step bias turnover, and reduces LC resonance current, thereby reducing energy loss. The channel selection and processing module comprises bidirectional switches (DW 1, DW 2) for capacitance selection, and the input ends of the bidirectional switches (DW 1, DW 2) comprise V S GND, output ends of the switch synchronous circuit switches S1 and S2, and output ends of the bidirectional change-over switches (DW 1 and DW 2) are respectively connected with the storage capacitor C S At both ends of the tube. The active rectifier module aims at converting the sensor alternating current output into direct current output in a rectifying mode, and an active diode is adopted to replace a traditional passive diode, so that the diode drop is reduced. The comparator in the active diode adopts a common-gate input comparator with an unbalanced Schmitt inverter, and has a larger input range and accurate comparison. The self-adaptive pulse generating circuit and the digital control circuit are used for generating pulses which change along with the sensor and the external inductor and further serve as switch control signals of the synchronous switch module.
Referring to fig. 2 to 6, as the number of offset flipping times M increases, the efficiency of energy collection also increases. It should be noted that the larger the number M of bias inversions is, the smaller the current value of the inductor in the voltage inversions process is, so that the energy loss generated by the resistor in the loop is also smaller. Therefore, the bias flip times M can improve the efficiency of energy collection, and are actually realized by reducing the energy loss caused by the resistor.
Taking fig. 7 as an example, the working principle of the adaptive piezoelectric energy harvesting interface circuit adopting the three-step bias flipping technique is as follows:
taking the equivalent output current of the piezoelectric sensor in the positive half period as an example, when the internal capacitance C P Voltage V across PN Smaller than the storage capacitance C S At the voltage of, the current source I P To C P And charging is carried out. When C is P Voltage V across PN Charging to more than V S When the active diode is conducted, the active rectifying circuit starts to work, and the current source I P To a storage capacitor C S And charging is carried out. When the current I is P When passing through zero, the current source I P To storage capacitor C S Is finished, at this time, the signal O N1 The change of the voltage of the capacitor leads to the generation of a corresponding switch pulse sequence in the switch control module, the corresponding switch tubes are sequentially conducted, 3 continuous bias overturning processes are carried out, and the capacitor C is completed P Voltage V between two terminals PN The flipping of (1). Conversely, the negative half-cycle operation of the current source is similar.
Further as a preferred embodiment, an active rectifier is included, and referring to fig. 8, the active rectifier is composed of a common-gate comparator and a MOS array, and the self-biased common-gate comparator has a wider input voltage range and does not need an additional current source for biasing. While following the voltage V N The output low voltage of the comparator is gradually increased, the unbalanced Schmitt phase inverter is added in the invention, the accurate comparison result is obtained by converting the threshold voltage of the phase inverter, and the unbalanced Schmitt phase inverter is adopted due to the single-side use effect of the common-gate comparator, so that M is enabled to be more than M N7 And the circuit is kept normally open, so that the power consumption of the circuit is reduced. At a current source I P At the beginning of the positive half cycle, voltage V P Less than voltage V S At this time M P1 And M P2 Is at a low potential, M P2 Is opened, and M N1 And M N2 Is also at a low potential, M N2 And closing the switch so that the output is at a high potential and the PMOS switch tube is closed. When the capacitance C is P Charging to a voltage V P Greater than voltage V S When, M P1 And M P2 Is at a high potential, M P2 Is turned off, and M N1 And M N2 Is also at a high potential, M N2 Opening to make the output be low potential, opening PMOS switch tube and making current source I be P To start to store the capacitor C S And charging is carried out.
Further as a preferred embodiment, the method further includes multiplexing the storage capacitor and the synchronous switch capacitor, selectively turning on the bidirectional switches DW1 and DW2, and in a bias turning stage, the capacitor is connected to the switch loop module to perform a bias operation, and in a non-bias turning stage, the capacitor is connected to the output loop to store charges. The number of external capacitors is reduced by the capacitor multiplexing mode, and the circuit volume is reduced. The bidirectional switch gating signal is obtained by the sum of all the pulse phases generated by the adaptive pulse control circuit.
Further preferably, the apparatus further comprises an adaptive switching pulse generating circuit. Referring to fig. 9, the comparator in the active rectifier is at V PN The voltage being higher than the output voltage V S When the capacitor voltage is higher than the reference voltage, the comparator in the signal generation outputs a high level signal as an end signal of the first turnover control and as a start signal of the second turnover control, and simultaneously the high level output of the comparator in the charging circuit of the second stage is used as an end signal. The signal for the multi-step flip control is generated and so on. For different piezoelectric sensors, the final output voltages are different, and different output voltages generate different charging currents, so that the pulse widths of control signals are also different, namely self-adaption is realized. Fig. 9 is a schematic diagram of an adaptive switching pulse generation circuit, in which a charging capacitor is charged mainly by a current difference between a current source and a current flowing through a resistor. According to different final value voltages, different charging time is generated by the obtained difference currents with different sizes, and therefore self-adaption of the switching pulse is achieved.
Further as a preferred embodiment, the synchronous switch circuit further comprises a current-blocking diode used for the synchronous switch circuit, and the current-blocking diode prevents the phenomenon of current backflow caused by inaccurate switch conduction time. The current blocking diodes may even be multiplexed with active diodes to reduce the voltage drop across the diodes.
Referring to fig. 10, the present invention also has a configured SSHC mode of operation. The external inductor L is removed, and the choke diodes in each loop are reserved, so that the SSHI working mode can be converted into the SSHI working mode, the SSHI working mode is suitable for small-volume scenes, and the high energy collection efficiency is still kept under the condition that the inductor is removed.
The SSHC interface circuit is based on charge transfer between capacitors, has different working principle from S3BF, but is essentially the same asInternal capacitance C P The charges on the capacitor are transferred, and finally the purpose of voltage inversion is achieved. For the convenience of analysis, neglecting the conduction voltage drop of the diode, as shown in fig. 11 to 14, the voltage flipping process of SSHC is sequentially divided into three steps: (1) Charge sharing, capacitor C P To the capacitor C B Charging is carried out to share the charge to the capacitor C B . (2) Charge removal, capacitor C P The residual charge on the capacitor is removed by self-discharge, similar to a single switch commutation process. (3) Charge transfer, capacitance C B To the capacitor C P Charging, transferring charge to a capacitor C B 。
The present invention should be considered as limited only by the preferred embodiments and not by the specific details, but rather as limited only by the accompanying drawings, and as used herein, is intended to cover all modifications, equivalents and improvements falling within the spirit and scope of the invention.
Claims (2)
1. A self-adaptive piezoelectric energy collection interface circuit is characterized by comprising a synchronous switch extraction module, an active rectifier module, a self-adaptive pulse generation circuit, a digital control circuit and a channel selection and processing module; the input end of the synchronous switch extraction module is connected with two ends of the piezoelectric sensor and is simultaneously connected with an external inductor and an overturning capacitor in sequence; the input end of the active rectifier module is respectively connected with two ends of the piezoelectric sensor, and the output end of the active rectifier module is connected with the storage capacitor and the intermittent power management circuit; the self-adaptive pulse generating circuit is connected with the digital control circuit; the channel selection and processing module comprises a bidirectional selector switch for selecting the reversed capacitor, and the input end of the bidirectional selector switch comprises V S The output ends of the switch S1 and the switch S2 of the ground and synchronous switch extraction module are respectively connected with two ends of the storage capacitor; the active rectifier module consists of two symmetrical partial circuits, each symmetrical circuit comprises a self-biased common-gate comparator with an unbalanced Schmidt inverter, a PMOS and an NMOS; the self-biased common-gate comparator with the unbalanced Schmitt inverter is connected with the output of the self-biased common-gate comparatorBalancing the inputs of the schmitt inverters; the inputs of the self-biased common-gate comparator are respectively connected with V S And the input of the piezoelectric sensor, and then its output connects PMOS grid and input of a inverter of this partial circuit separately, the input of this inverter connects NMOS of another symmetrical circuit; the drain electrodes of the PMOS and the NMOS of each symmetrical circuit part are connected with each other and then connected with one end of the piezoelectric sensor; the output signal of the self-bias common-gate comparator in the active rectifier module is simultaneously connected to the self-adaptive pulse generating circuit, and a control signal of a synchronous switch loop is generated according to the output signal; meanwhile, the output part of the self-adaptive pulse generating circuit is connected with a digital switching signal generating circuit; the output of the digital switch signal generating circuit is respectively connected with the switch part of the synchronous switch extraction module; the input of the self-adaptive pulse generating circuit is connected with a clock signal formed by a self-biased common-gate comparator in the active rectifier module, and the output of the self-adaptive pulse generating circuit is connected with the self-adaptive pulse generating circuit of the next stage; the output of the self-adaptive pulse generating circuit is connected with the unbalanced Schmidt inverter and then connected with the AND gate together with the input signal to generate a pulse signal; the self-adaptive pulse generating circuit comprises a comparator, a current source, a capacitor and an inverter; the phase inverter is connected with the grid electrode of a field effect tube, and the drain electrode of the field effect tube is connected with the current source, the output of the equivalent resistance module, the capacitor and one input of the comparator; the other input of the comparator is connected with a reference voltage; the synchronous switch extraction module comprises two public switches, wherein one ends of the two public switches are connected with each other and then connected to one end of an inductor, and the other end of the inductor is connected to one end of the piezoelectric sensor; the other ends of the two public switches are connected to two ends of the turning capacitor respectively, the other end of each public switch is connected with branches of the two choke diodes, each branch is formed by connecting a switching tube and one choke diode in series, the directions of the choke diodes in the two branches are opposite, and the four choke diodes are connected with each other and then connected to the other end of the piezoelectric sensor.
2. The adaptive piezoelectric energy harvesting interface circuit of claim 1, wherein one end of the common switch is removed from inductance and is directly connected to the piezoelectric sensor to form a configured SSHC circuit.
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| CN112928948B (en) * | 2021-01-29 | 2022-11-22 | 合肥工业大学 | Piezoelectric energy collecting system adopting novel control circuit |
| CN113691161B (en) * | 2021-08-23 | 2023-11-10 | 深圳市爱协生科技股份有限公司 | Energy extraction interface circuit based on double-voltage electric energy collector |
| CN113726220B (en) * | 2021-09-18 | 2024-05-03 | 中山大学 | Piezoelectric energy collection interface circuit based on multi-step overturning of inductance and capacitance |
| CN114172390A (en) * | 2021-11-23 | 2022-03-11 | 复旦大学 | Capacitor overturning rectifying circuit without complete inductance integration |
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