CN111277170B - Interface circuit and method for piezoelectric energy collection - Google Patents
Interface circuit and method for piezoelectric energy collection Download PDFInfo
- Publication number
- CN111277170B CN111277170B CN202010073383.0A CN202010073383A CN111277170B CN 111277170 B CN111277170 B CN 111277170B CN 202010073383 A CN202010073383 A CN 202010073383A CN 111277170 B CN111277170 B CN 111277170B
- Authority
- CN
- China
- Prior art keywords
- voltage
- switch
- energy storage
- storage element
- piezoelectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 35
- 238000004146 energy storage Methods 0.000 claims abstract description 51
- 230000008859 change Effects 0.000 claims abstract description 14
- 238000003306 harvesting Methods 0.000 claims description 36
- 230000004044 response Effects 0.000 claims description 17
- 230000000630 rising effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000009877 rendering Methods 0.000 claims 1
- 230000006870 function Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 11
- 230000010355 oscillation Effects 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Dc-Dc Converters (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention provides an interface circuit for collecting piezoelectric energy, which comprises a control unit, a voltage control unit and a voltage control unit, wherein the control unit is used for generating a control signal for controlling a switch connected with an energy storage element of a piezoelectric element to be conducted for a conduction time when each positive voltage extreme value and negative voltage extreme value of the piezoelectric element are reached or each half period point of the positive voltage and negative voltage change is passed, and controlling the switch to be disconnected after the conduction time so as to realize bias overturning and collecting the piezoelectric energy. The control unit is further used for setting the on time to be half of the resonance period of the equivalent capacitance of the energy storage element and the piezoelectric element; and/or the switch is turned off by detecting the rise or fall of the positive electrode voltage or the negative electrode voltage to a preset voltage value.
Description
Technical Field
The present invention relates to the field of piezoelectric energy harvesting, and more particularly to an interface circuit and method for piezoelectric energy harvesting that can be used to implement the inductively synchronized switching harvesting (Synchronized Switch Harvesting on Inductor (SSHI)) technique.
Background
The quality of the rectifier interface circuit is a key to how much piezoelectric energy is collected. While rectifiers employing parallel inductance synchronous switch harvesting (Parallel Synchronized Switch Harvesting on Inductor (P-SSHI)) technology are able to harvest more energy than rectifiers employing simple diode construction, current implementations of P-SSHI functionality are largely aided by board-set design of discrete components and micro-control units (Microcontroller Unit (MCUs)).
Disclosure of Invention
It is an object of the present invention to provide an interface circuit and method for piezoelectric energy harvesting for implementing SSHI technology.
According to an aspect of the present invention, there is provided an interface circuit for piezoelectric energy collection, comprising a control unit for generating a control signal for controlling a switch connected in series with an energy storage element of a piezoelectric element to be turned on at each half-cycle point or positive/negative pole reaching an extreme value of a positive voltage or a negative voltage variation of the piezoelectric element, and for controlling the switch to be turned off after an on time has elapsed, so as to achieve bias flip (bias flip) and to perform piezoelectric energy collection.
According to the interface circuit of the above aspect of the present invention, the control unit is further configured to set the on time to be half of a resonance period of equivalent capacitances of the energy storage element and the piezoelectric element; and/or turning off the switch by detecting whether the positive voltage or the negative voltage rises or falls from the extreme value to a preset voltage value.
According to the above aspect of the invention, the interface circuit further comprises a switching circuit having first to fourth switches, and/or the first to fourth switches form a rectifier bridge, one or more of the first to fourth switches comprising a diode or a selective switching transistor, and/or the selective switching transistor comprising a transistor, a transistor and/or a metal oxide semiconductor tube; and/or the control unit is further used for generating control signals for respectively controlling the selective switching tubes.
According to the interface circuit of the above aspect of the present invention, the energy storage element is connected in series or parallel with the piezoelectric element and the switching circuit via the switch when the switch connected to the energy storage element is turned on, and/or the energy storage element includes an inductance; and/or the half-period point of the positive voltage or the negative voltage change period and/or the extremum of the positive electrode and the negative electrode corresponds to the position where the piezoelectric element is deformed to the maximum point, and/or the control signal starts to have a high level when each half-period point of the positive voltage or the negative voltage change of the piezoelectric element reaches the extremum, so that a switch connected with the energy storage element is conducted, and/or the control signal has a low level when a preset conduction time is after each half-period point or the positive voltage or the negative voltage rises or falls to the preset voltage value, so as to disconnect the switch connected with the energy storage element; and/or the preset value is the partial pressure of the voltage rectified by the switch circuit.
According to another aspect of the invention, a method is provided that includes detecting a half-cycle point or extremum of a period of positive and negative voltage variation of a piezoelectric element, and/or controlling a switch coupled to an energy storage element of the piezoelectric element to conduct for a short period of time in response to detecting the extremum or extremum to effect bias switching and harvesting piezoelectric energy.
The method according to the above aspect of the present invention further comprises controlling the switch to be turned on every time the extreme value or half cycle point of the positive electrode voltage and the negative electrode voltage passes, wherein the on time is set to be half of the resonance period of the equivalent capacitance of the energy storage element and the piezoelectric element; and/or setting the on time to open the switch when the positive voltage or the negative voltage of the piezoelectric element is detected to rise or fall from the extreme value to a preset voltage value.
The method according to the above aspect of the invention further comprises controlling the switch to be turned off in response to the on-time being reached, and/or turning the switch on in response to the on-time not being reached; and/or controlling the switch connected with the energy storage element to be opened in response to the positive voltage or the negative voltage rising or falling from the extreme value to the preset voltage value; and/or in response to the positive voltage or the negative voltage not rising or falling to the preset voltage value, conducting the switch connected with the energy storage element.
The method according to the above aspect of the invention further comprises generating first to fourth control signals; and/or controlling the gating or opening of the first to fourth switches of the switching circuit for piezoelectric energy harvesting, respectively, with the first to fourth control signals; and/or generating the first to fourth control signals and/or a fifth control signal for controlling the on or off of a switch connected to the energy storage element by comparing the positive voltage with a rectified voltage and/or comparing the negative voltage with the rectified voltage, respectively; and/or when the extreme value or the half-period point is detected, the fifth control signal is provided with a high level so as to control the switch connected with the energy storage element to be turned on, and/or when the conduction time is detected to be over or the positive voltage or the negative voltage of the piezoelectric element is detected to rise or fall from the extreme value to a preset voltage value, the fifth control signal is provided with a low level so as to control the switch connected with the energy storage element to be turned off; and/or the preset value is the divided voltage of the rectified voltage.
According to yet another aspect of the present invention there is provided a non-transitory machine readable storage medium comprising one or more instructions, characterized in that the one or more instructions, in response to being executed, cause one or more processing modules to perform one or more steps of a method according to the above aspect of the present invention.
According to yet another aspect of the present invention, there is provided a control apparatus comprising one or more processing modules; one or more memory modules coupled with the one or more processing modules, the memory modules for storing one or more instructions that, in response to being executed, cause the one or more processing modules to perform one or more steps of a method as described in the above aspects of the invention.
According to the above aspect of the present invention, since the half cycles or extremum of the positive electrode voltage and the negative electrode voltage are detected by the control unit and the detected signal is fed back to the piezoelectric energy collection interface circuit, every time the positive electrode voltage V P And a negative electrode voltage V N When the extreme value or each half-period point of the positive voltage or the negative voltage is reached, the switch connected with the energy storage element can be controlled to be conducted, and compared with V P And V N The switch is controlled to be turned off after a short period of time of the change period of the positive voltage or the negative voltage, wherein the on time is far smaller than the change period of the positive voltage or the negative voltage, thereby achieving the effects of preventing oscillation, realizing rapid overturning and improving the energy collection efficiency. In addition, according to another embodiment of the present invention, the switching on and off of the rectifier bridge of the piezoelectric energy collection interface circuit can be controlled, so that piezoelectric or vibration energy collection can be performed to achieve the effect of reducing energy loss. According to the above aspects of the present invention, the fully integrated circuit can be utilized to implement SSHI functions autonomously without requiring an additional MCU to implement control logic.
Drawings
FIG. 1 shows a schematic diagram of a piezoelectric energy harvesting interface circuit according to one embodiment of the invention;
FIG. 2 shows a schematic diagram of a piezoelectric energy harvesting interface circuit according to another embodiment of the invention;
FIG. 3 shows a schematic diagram of a piezoelectric energy harvesting interface circuit according to yet another embodiment of the invention;
FIG. 4 shows a schematic diagram of a piezoelectric energy harvesting interface circuit according to yet another embodiment of the invention;
FIG. 5 shows a schematic diagram of a simulated waveform of a piezoelectric energy harvesting interface circuit, according to one embodiment of the invention;
FIG. 6 illustrates an enlarged schematic diagram corresponding to the simulated waveforms shown in FIG. 5, in accordance with one embodiment of the present invention;
FIG. 7 shows a schematic flow chart of a method according to another embodiment of the invention;
FIG. 8 shows a schematic flow chart of a method according to yet another embodiment of the invention;
fig. 9 shows a schematic diagram of an example apparatus according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
While the following description sets forth various implementations that may be illustrated, for example, in a system architecture, implementations of the techniques and/or arrangements described herein are not limited to a particular system architecture and/or computing system, and may be implemented with any architecture and/or computing system for similar purposes. For example, the techniques and/or arrangements described herein may be implemented with various architectures and/or various computing devices and/or electronic devices, such as one or more integrated circuit chips and/or packages. Furthermore, while the following description may set forth numerous specific details (e.g., logical implementations of system components, types and interrelationships, logical partitioning/integration choices, etc.), the claimed subject matter may be practiced without these specific details. In other instances, some materials (e.g., control structures and complete software instruction sequences) may not be shown in detail in order not to obscure the materials disclosed herein. The materials disclosed herein may be implemented in hardware, firmware, software, or any combination thereof.
The materials disclosed herein may also be implemented as instructions stored on a machine-readable medium or memory that can be read and executed by one or more processors. A computer-readable medium may include any medium and/or mechanism for storing or transmitting information in a form readable by a machine (e.g., a computing device). For example, a machine-readable medium may include Read Only Memory (ROM), random Access Memory (RAM), magnetic disk storage media; an optical storage medium; a flash memory device; and/or other media. In another form, a non-volatile article (e.g., a non-volatile computer readable medium) may be used in any of the examples mentioned above or in other examples, including those elements (e.g., RAM, etc.) which may temporarily store data in a "transitory" manner. Fig. 1 shows a schematic diagram of an example of a piezoelectric energy harvesting interface circuit according to an embodiment of the invention. In one embodiment, the interface circuit 100 may be used to implement piezoelectric energy harvesting for P-SSHI functions. The interface circuit 100 may utilize a fully integrated circuit design to autonomously implement the P-SSHI function without requiring an additional MCU to implement control logic.
Referring to fig. 1, the interface circuit 100 may include a control unit 102 connected in parallel with a piezoelectric element 110. As shown in fig. 1, the piezoelectric element 110 may be equivalently a current source 112 connected in parallel with a capacitor 114. In one embodiment, the control unit 102 may provide the positive voltage V to the piezoelectric unit 110 P And/or negative voltage V N Extreme value or V of (2) P Or V N The change is detected every half cycle point. For example, as shown in 504 or 506 of FIG. 6, the extreme value or each half-cycle point corresponds to the deformation of the piezoelectric element 110 to a maximum point, e.g., V P Or V N Will start falling or rising from, for example, a maximum or minimum, i.e., will start flipping.
At voltage V P Or V N At the extreme value or at each half-cycle point, control unit 102 generates a fifth control signal ctrl0 for causing a voltage to be applied to energy storage element 106 (e.g., electricallySense 106, etc.) and the switch 104 (S0 shown in fig. 1) is turned on, and after the switch 104 is turned on for a period of time, the switch 104 is turned off to prevent oscillation, realize rapid overturn, and improve energy collection efficiency. In one embodiment, the on-time corresponds to V shown in FIG. 6 P Or V N Is used for the bias flip time of (a). In another embodiment, the on-time may be half of the resonance period of the equivalent capacitance 114 of the energy storage element 106 and the piezoelectric element 110, but the invention is not limited thereto, and in other embodiments, the on-time may be much less than the voltage V P And V N Similar values of the variation period of (c). In yet another embodiment, the on-time may be V P Or V N The time from the extreme value to a preset voltage value, which may be the divided voltage of the rectified voltage (e.g., V as described below rect V_f) of the voltage division of (c). Wherein the fifth control signal ctrl0 has a high level during the on-time to control the switch 104 to be turned on, and has a low level outside the on-time to control the switch 104 to be turned off.
In one embodiment, the inductor 106 may be connected in parallel with the control unit 102 via the switch 104, but in other embodiments, the inductor 106 may be connected in series with the control unit 102 via the switch 104 (e.g., as shown in fig. 3 or 4). In one embodiment, inductor 106 and switch 104 may be used to implement the bias flip function of P-SSHI.
In one embodiment, the control unit 102 may control the on-time of the switch 104 by at least the following two methods (a) and/or (B), but the invention is not limited thereto:
(A) In one embodiment, the on-time of the switch 104 may be controlled by a predetermined time. For example, the preset time may be based on a vibration period (e.g., voltage V shown in fig. 5 and 6 P And V N A variation period of (c) is set. For example, the control unit 102 is passing through V P And V N The switch 104 is turned on at each half cycle point of the change, and the switch 104 is turned off after the turn-on time after each half cycle point is preset, thereby realizing V in the turn-on time P And V N Is provided. In one embodiment, each half-cycle time corresponds to a point in time at which the piezoelectric element 110 is deformed to a maximum point, for example, as shown at 504 or 506 of fig. 6. In another embodiment, the on-time may be set to half the resonant period of the equivalent capacitance 114 of the energy storage element 106 and the piezoelectric element 110. In another embodiment, the on-time may be set to substantially correspond to V P Or V N Is a flip time of (a); and/or
(B) In another embodiment, the voltage V may be detected P Or V N Is an extremum of (a). For example, voltage V P Or V N When the extreme value is reached and the turning is about to start, the control unit 102 controls the switch 104 to be turned on, and when V P Or V N Rise or fall to a predetermined voltage value (e.g., the predetermined voltage value may be set to the rectified voltage V rect The control unit 102 controls the switch 104 to be turned off when the voltage v_f) is divided. In one embodiment, the extremum corresponds to the deformation of the piezoelectric element 110 to a maximum point, V P Or V N The flip is about to begin from the maximum or minimum, for example, as shown at 504 and 506 of fig. 6.
For example, the control unit 102 may control on and off of the switch 104 connected to the inductor 106 using the fifth control signal ctrl0. The control unit 102 can control the input voltage signal V by processing the input voltage signal P 、V N And rectified voltage V rect To generate a fifth control signal ctrl0 for the switch 104. Referring to FIGS. 5 and 6, in one embodiment, as indicated by dashed box 502, the fifth control signal ctrl0 is at voltage V P And V N The switch 104 is turned on by being turned on for a short period of time (preset on time) after each half-period point of the change period (for example, corresponding to the maximum point of deformation of the piezoelectric element 110), and turned off by being turned on for a short period of time (or the end of the on time) after each half-period point P And V N Is provided. In one embodiment, the on-time may be set to half the resonant period of the energy storage element 106 and the capacitor 114.
In another embodiment, at V P Or V N Reaching an extreme value (e.g., corresponding to deformation of the piezoelectric element 110 to a maximum point, where V P Or V N I.e. falling or rising from, e.g. a maximum or minimum value, i.e. turning over), the fifth control signal ctrl0 has a high level, thereby turning on the switch 104, at a voltage V P Or V N A predetermined point of the rising or falling edge of (e.g., when V P Or V N Rising to or falling to a preset voltage value) to a low level, thereby turning off the switch 104 to achieve V P And V N Is provided.
As shown in fig. 1, the interface circuit 100 may further include a switch circuit 120. For example, the switching circuit 120 may include a rectifier bridge, but the present invention is not limited thereto. The bridge circuit of the rectifier bridge may include first through fourth switches 122 through 128 (e.g., S1, S2, S3, and S4 shown in fig. 1). The first through fourth switches 122 through 128 may be used to apply the voltage V of the piezoelectric element 110 P And/or V N Is converted into a DC voltage V rect Stored in rectifying capacitor 108 (C shown in FIG. 1) rect ) And thereby collect piezoelectric and/or vibrational energy to reduce energy losses. In one embodiment, the first through fourth switches 122 through 128 may constitute a full-wave rectifier bridge. In one embodiment, the first through fourth switches 122 through 128 may include diodes.
In one embodiment, the first through fourth switches 122 through 128 may be used to provide a temporary conduction path through the switching circuit 120.
For example, when V P ≥V rect The first switch 122 (S1) is turned on; when V is P ＜V rect The first switch 122 is opened.
When V is N ≥V rect The second switch 124 (S2) is turned on; when V is N ＜V rect When the second switch 124 is open.
When V is N When less than or equal to 0, the third switch 126 (S3) is turned on; when V is N At > 0, the third switch 126 is open.
When V is P When less than or equal to 0, fourthSwitch 128 (S4) is turned on; when V is P At > 0, the fourth switch 128 is turned off.
Fig. 1 illustrates only one example of a piezoelectric energy harvesting interface circuit that may be used to implement the P-SSHI function, and in other embodiments, interface circuits having other structures may be utilized.
Fig. 2 shows a schematic diagram of an example of an interface circuit according to another embodiment of the invention. The interface circuit 200 shown in fig. 2 may be used to implement piezoelectric energy harvesting for P-SSHI functions. The interface circuit may utilize a fully integrated circuit design to autonomously implement the P-SSHI function without requiring an additional MCU to implement the control logic.
Similar to the interface circuit 100 of fig. 1, the interface circuit of fig. 2 may include a control unit 202 in parallel with the piezoelectric element 110, an inductor 106 (or other energy storage element, etc.) in parallel with the control unit 202 via a switch 104, the switch 104 in series with the inductor 106, a switching circuit 220 (e.g., including first through fourth switches 222 through 228) controllable to be turned on and off by the control unit 202, and/or a memory circuit for storing a voltage signal generated by V P And V N The DC voltage V converted from the AC voltage of (2) rect Capacitance 108 (C) rect )。
In one embodiment, the switching circuit 220 may include a rectifier bridge, but the present invention is not limited thereto. Any of the first through fourth switches 222 through 228 may include diodes and/or selectively switched transistors. For example, the selective switch may include a transistor, a metal oxide semiconductor (metal oxide semiconductor (MOS)) transistor, etc., but the present invention is not limited thereto. In other embodiments, one or more of the first through fourth switches 222 through 228 may include a diode, and the remaining switches may include a selective switching tube, but the present invention is not limited thereto.
Similar to that described in fig. 1, the first through fourth switches 222 through 228 may be used for piezoelectric and/or vibrational energy harvesting to reduce energy losses. For example, the first to fourth switches 222 to 228 may constitute a full-wave rectifier bridge to convert the piezoelectric voltage V of the piezoelectric element 110 P And/or V N Is converted into DC voltage V rect Stored in rectifying capacitor 108 (C shown in FIG. 1) rect ) And (3) upper part.
As shown in fig. 2, in one embodiment, the control unit 202 may control the on-time of the switch 104 at least by two methods (a) and/or (B) as described above to prevent oscillation, achieve fast flipping, and improve energy harvesting efficiency. The control unit 202 may also be used to control the switching on and off of the switching circuit 220 to reduce energy consumption.
As shown in fig. 2, the control unit 202 may control the on and off of the first to fourth switches 222 to 228 and/or the on and off of the switch 104 connected to the inductor 106 using the first to fourth control signals ctrl1, ctrl2, ctrl3, ctrl4, and the fifth control signal ctrl0, respectively. In one embodiment, the control unit 202 may control the voltage signal V by processing the input voltage signal V P 、V N And rectified voltage V rect To generate the first to fourth control signals ctrl1 to ctrl4 and to generate a fifth control signal ctrl0 (e.g., as shown in fig. 5 or 6) similarly to that shown in fig. 1. In another embodiment, the control unit 202 may generate control signals for controlling the turning on and off of the respective selective switching tubes, respectively.
Fig. 2 illustrates only one example of a piezoelectric energy harvesting interface circuit that may be used to implement the P-SSHI function, and in other embodiments, interface circuits having other structures may be utilized.
Fig. 3 shows a schematic diagram of an example of an interface circuit according to another embodiment of the invention. The interface circuit 300 shown in fig. 3 may be used to implement piezoelectric energy harvesting for series inductance synchronous switch harvesting (Serial Synchronized Switch Harvesting on Inductor (S-SSHI)) technology. The interface circuit may utilize a fully integrated circuit design to autonomously implement the S-SSHI function without requiring an additional MCU to implement the control logic.
Similar to the interface circuit 100 shown in fig. 1, the interface circuit 300 shown in fig. 3 may include a control unit 302 in parallel with the piezoelectric element 110, a switching circuit 320 (e.g., including first through fourth switches 322 through 328), and/or a circuit for storing a voltage signal generated by V P And V N Ac voltage of (2)Converted DC voltage V rect Capacitance 108 (C) rect ). Unlike the interface circuit 100 of fig. 1, the inductor 306 (or other energy storage element, etc.) of the interface circuit 300 of fig. 3 is connected in series with the piezoelectric element 110 via the switch 304.
In one embodiment, the switching circuit 320 may include a rectifier bridge, but the present invention is not limited thereto. The first through fourth switches 322 through 328 may include diodes. Similar to that described in fig. 1, the first through fourth switches 322 through 328 may be used for piezoelectric and/or vibrational energy harvesting to reduce energy losses. For example, the first to fourth switches 322 to 328 may constitute a full-wave rectifier bridge to convert the piezoelectric voltage V of the piezoelectric element 110 P And/or V N Is converted into a DC voltage V rect Stored in rectifying capacitor 108 (C shown in FIG. 1) rect ) And (3) upper part.
Similar to that shown in fig. 1, in fig. 3, in one embodiment, the control unit 302 may control the on-time of the switch 304 at least by two methods (a) and/or (B) as described above to prevent oscillations, achieve fast flipping, and improve energy harvesting efficiency. In one embodiment, the control unit 302 may control the voltage signal V by processing the input voltage signal V P 、V N And rectified voltage V rect To generate a fifth control signal ctrl0 (e.g., as shown in fig. 5 or 6).
Similar to that shown in fig. 1, in one embodiment, the first through fourth switches 322 through 328 may be used to provide a temporary conduction path through the switching circuit 320.
Fig. 3 illustrates only one example of a piezoelectric energy harvesting interface circuit that may be used to implement the S-SSHI function, and in other embodiments, interface circuits having other structures may be utilized.
Fig. 4 shows a schematic diagram of an example of an interface circuit according to another embodiment of the invention. The interface circuit 400 shown in fig. 4 may be used to implement piezoelectric energy harvesting for S-SSHI functions. The interface circuit may utilize a fully integrated circuit design to autonomously implement the S-SSHI function without requiring an additional MCU to implement the control logic.
Similar to the interface circuit 100 of fig. 1, the interface circuit of fig. 4 may include a control unit 402 in parallel with the piezoelectric element 110, a switching circuit 220 (e.g., including first through fourth switches 422 through 428) that may be controlled to be turned on and off by the control unit 402, and/or a circuit for storing a voltage signal generated by V P And V N Dc voltage V converted from ac voltage of (a) rect Capacitance 108 (C) rect ). Unlike the interface circuit 100 of fig. 1, the inductor 406 (or other energy storage element, etc.) of the interface circuit 400 of fig. 4 is connected in series with the piezoelectric element 110 via the switch 404.
In one embodiment, the switching circuit 420 may include a rectifier bridge, but the invention is not limited thereto. Any of the first through fourth switches 422 through 428 may include diodes and/or selectively switched transistors. For example, the selective switch may include a transistor, a MOS transistor, etc., but the present invention is not limited thereto. In other embodiments, one or more of the first through fourth switches 422 through 428 may include a diode, while the remaining switches may include a selective switching tube, but the invention is not limited thereto.
Similar to that described in fig. 1, the first through fourth switches 422 through 428 may be used for piezoelectric and/or vibrational energy harvesting to reduce energy losses. For example, the first to fourth switches 422 to 428 may constitute a full-wave rectifier bridge to convert the piezoelectric voltage V of the piezoelectric element 110 P And/or V N Is converted into DC voltage V rect Stored in rectifying capacitor 108 (C shown in FIG. 1) rect ) And (3) upper part.
Similar to that shown in fig. 1, in one embodiment, the control unit 402 may control the on-time of the switch 404 at least by two methods (a) and/or (B) as described above to prevent oscillations, achieve fast flipping, and improve energy harvesting efficiency. The control unit 402 may also be used to control the switching on and off of the switching circuit 420 to reduce energy consumption.
As shown in fig. 4, the control unit 402 may control the first to fourth switches 422 to 42 using the first to fourth control signals ctrl1, ctrl2, ctrl3, ctrl4, and the fifth control signal ctrl0, respectively8. And/or the on and off of switch 404 in series with inductor 406. In one embodiment, the control unit 402 may control the voltage signal V by inputting the voltage signal V P 、V N And rectified voltage V rect To generate the first to fourth control signals ctrl1 to ctrl4 and to generate a fifth control signal ctrl0 (e.g., as shown in fig. 5 or 6) similarly to that shown in fig. 2, respectively.
Similar to that shown in fig. 1, in one embodiment, the first through fourth switches 422 through 428 may be used to provide a temporary conduction path through the switching circuit 420.
Fig. 4 illustrates only one example of a piezoelectric energy harvesting interface circuit that may be used to implement the S-SSHI function, and in other embodiments, interface circuits having other structures may be utilized.
Fig. 5 shows a simulated waveform of an interface circuit for piezoelectric energy harvesting according to one embodiment of the invention. FIG. 6 illustrates an enlarged schematic view of the simulated waveform of FIG. 5 in accordance with one embodiment of the invention.
Referring to fig. 5 and 6, one example of a simulated waveform of bias flip is schematically shown. As shown in fig. 5 and 6, the control unit can control the voltage V P 、V N Detection is performed to obtain a voltage detection signal (for example, shown in fig. 1 to 4). When V is P Or V N When the extreme value or critical point is reached (e.g., as shown at 504 or 506 in dashed box 502), the switch S0 connected to the energy storage element (e.g., inductor) is controlled to be turned on by the control unit, wherein the inductor and the control unit may be in parallel or series, and after a period of time, the switch S0 is turned off to prevent oscillation, and V is realized by SSHI P 、V N And the energy collection efficiency is improved.
As described above, in one embodiment, the control unit may control the on-time of the switch 104 at least by methods (a) and/or (B) as described above, but the present invention is not limited thereto.
Fig. 7 shows an example of a flow chart of a method according to an embodiment of the invention. In one embodiment, the method may be used to implement bias flipping of SSHIs.
As shown in fig. 7 and referring to fig. 1 through 4, at block 702, V may be detected P And/or V N Half period (V) P And/or V N For example, the interval between adjacent dashed boxes 502 of fig. 5 or 6 is a half period. At block 704, whenever V is detected P And/or V N At half a cycle of the vibration process, a switch connected (e.g., in series) with the energy storage element is controlled to conduct for a preset time. In one embodiment, the preset on-time may be set to half the resonant period of the energy storage element 106 and capacitor 114. At decision block 706, a determination may be made as to whether the preset time has elapsed. If the preset time has elapsed, at 708, the switch associated with the energy storage element is controlled to open to implement the SSHI function using the energy storage element and thus the bias flip, thereby V P And V N Fast turnover, no oscillation and high energy collecting efficiency. If, on the contrary, the preset time is not reached, the process of block 704 is performed continuously to continue to turn on the switch of the energy storage element.
Although not shown in FIG. 7, in one embodiment, the method shown in FIG. 7 may further include receiving the input signal V as described above P 、V N And V rect To generate the first to fourth control signals ctrl1 to ctrl4 and/or the fifth control signal ctrl0, and/or to control the on or off of the first to fourth switches using the first to fourth control signals ctrl1 to ctrl4, respectively, but the present invention is not limited thereto.
In one embodiment, as shown in FIGS. 5 and 6, the fifth control signal ctrl0 is at V P And/or V N The half period point of the vibration process (corresponding to the maximum point of deformation of the piezoelectric element) becomes high level in a period of time (preset conduction time) so as to conduct the switch connected with the energy storage element, wherein the voltage V P Or V N The flip starts from either the maximum value or the minimum value. The fifth control signal ctrl0 goes low after the half period (corresponding to the end of the preset on-time) to turn off the switch connected to the energy storage element.
Fig. 8 shows an example of a flow chart of a method according to an embodiment of the invention. In one embodiment, the method may utilize SSHI functionality to effect bias flip.
As shown in fig. 8 and referring to fig. 1 through 4, at block 802, V may be detected P And V N For example, as shown in dashed box 502 of fig. 6, detect V P Or V N Whether its extremum 504 or 506 is reached. For example, V P Or V N Falling from a maximum or rising from a minimum (which may correspond to deformation of the piezoelectric element to a maximum point), the flip will begin. At block 804, at detection of V P Or V N When the extreme value is reached, the switch connected with the energy storage element can be controlled to be turned on, V P And V N The flip starts. At decision block 806, the positive voltage V of the piezoelectric element 110 can be detected P Or negative voltage V N To determine V P Or V N Whether to rise to a preset voltage value. In another embodiment, the positive voltage V of the piezoelectric element 110 can be detected P Or negative voltage V N To determine V P Or V N Whether to drop to a preset voltage value.
If it is determined at decision block 806 that V P Or V N Up to or down to a preset voltage value, flow proceeds to block 808 to control the switch connected to the energy storage element to open to enable SSHI functionality with the energy storage element, as represented by bias flip (V P ，V N Fast turnover), does not oscillate, and consequently improves the energy collection efficiency. If it is determined at decision block 806 that V P Or V N If the voltage has not risen to the preset voltage value, the flow returns to block 804 to continue to turn on the switch in series with the energy storage element.
Although not shown in FIG. 8, in one embodiment, the method shown in FIG. 8 may further include processing the input signal V in accordance with the above P And V N And V is equal to rect To generate first to fourth control signals ctrl1 to ctrl4 and/or fifth control signal ctrl0, and/or to control the first to fourth control signals ctrl1 to ctrl4, respectivelyThe switch is turned on or off, but the invention is not limited thereto.
In one embodiment, in response to detecting V P Or V N When the extremum is reached, the fifth control signal ctrl0 is enabled to have a high level, so as to control the switch connected with the energy storage element to be turned on. In response to V P Or V N Rising to a preset voltage value or falling to a preset voltage value to enable the fifth control signal ctrl0 to be in a low level, so that a switch connected with the energy storage element is controlled to be disconnected, and overturn is completed to prevent oscillation. In one embodiment, the rising preset voltage value and the falling preset voltage value may be equal or unequal.
Fig. 9 illustrates an example apparatus 900 according to an embodiment of the invention. In one embodiment, the device 900 may include various architectures and/or various computing modules and/or electronic devices, etc. of one or more integrated circuit chips and/or packages. One or more processing modules 902 may be included, as well as one or more storage modules 904 coupled to the one or more processing modules 902. In one embodiment, the one or more memory modules 904 may include various memory modules such as random access memory, dynamic random access memory, or static random access memory. In one embodiment, the one or more memory modules 904 may be used to store one or more instructions (e.g., machine-readable instructions and/or computer programs) that are readable and/or executable by the one or more processing modules 902. The one or more instructions may also be stored on a non-transitory machine-readable storage medium. The one or more instructions, in response to being executed, cause the one or more processing modules 902 to implement the control units shown in fig. 1-4, and/or perform one or more operations as described above with reference to fig. 1-8. In one embodiment, fig. 9 illustrates only one example of an apparatus 900, and is not limiting of the invention, in some embodiments, the apparatus 900 may also include one or more other modules and/or portions (not shown). In one embodiment, the rice bran of the apparatus 900 may be implemented in hardware, software, firmware, and/or various combinations thereof, but the invention is not limited thereto.
As shown in fig. 1 to 9, according to one embodiment of the present invention, since the voltage V is controlled by the control unit P 、V N Detecting the variation period or extremum of the piezoelectric element and feeding the detected signal back to the piezoelectric energy collecting interface circuit, so that the switch connected to the energy storing element of the piezoelectric element is controlled to be turned on every half period or extremum and compared with V P And V N The switch is controlled to be turned off after a short period of time of the change period of the positive voltage or the negative voltage, wherein the on time is far smaller than the change period of the positive voltage or the negative voltage, so that the effect of fast turnover and no oscillation is realized, and the energy collection efficiency is improved. In addition, according to another embodiment of the present invention, the switching on and off of the rectifier bridge of the piezoelectric energy collection interface circuit can be controlled, so that piezoelectric or vibration energy collection can be performed to achieve the effect of reducing energy loss. According to the above aspects of the present invention, the fully integrated circuit can be utilized to implement SSHI functions autonomously, without requiring an additional MCU to implement control logic.
The above embodiments are merely examples of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An interface circuit for piezoelectric energy harvesting for implementing SSHI functionality, comprising;
a control unit for generating a control signal for controlling the switch connected to the energy storage element of the piezoelectric element to be turned on at a half-period point or extreme value of the change of the positive voltage or the negative voltage of the piezoelectric element, and for controlling the switch to be turned off after a turn-on time is passed to realize bias inversion and collecting piezoelectric energy, wherein the turn-on time is set to be a time when the positive voltage or the negative voltage rises or falls from the extreme value to a preset voltage value, and
the switching circuit comprises first to fourth switches forming a rectifier bridge, and the preset voltage value is the divided voltage of the voltage rectified by the switching circuit.
2. The interface circuit of claim 1, wherein one or more of the first to fourth switches comprises a diode or a selective switching transistor, and/or the selective switching transistor comprises a transistor, and/or a metal oxide semiconductor tube; and/or the control unit is further used for generating control signals for respectively controlling the selective switching tubes.
3. Interface circuit according to claim 1 or 2, characterized in that the energy storage element is connected in series or parallel with the piezoelectric element and the switching circuit via the switch when the switch connected to the energy storage element is conductive, and/or that the energy storage element comprises an inductance; and/or the half-period point and/or the extreme value of the change of the positive voltage or the negative voltage corresponds to the position where the piezoelectric element is deformed to the maximum point, and/or the control signal has a high level at the half-period point or the extreme value of the change of the positive voltage or the negative voltage of each piezoelectric element so as to lead a switch connected with the energy storage element to be conducted, and/or the control signal has a low level after the half-period point or when the positive voltage or the negative voltage rises or falls to the preset voltage value so as to disconnect the switch connected with the energy storage element.
4. A method for piezoelectric energy harvesting for SSHI functionality, comprising detecting a half-cycle point or extremum of a change in positive and negative voltages of a piezoelectric element, and/or controlling a conduction time of a switch coupled to an energy storage element of the piezoelectric element in response to detecting the extremum or half-cycle point, to effect a bias flip, the conduction time being set to a time at which the positive or negative voltage rises or falls from the extremum to a preset voltage value, the preset voltage value being a divided voltage of a rectified voltage.
5. The method of claim 4, further comprising controlling the switch to conduct each time an extreme or varying half-cycle point of the positive and negative voltages passes, the conduction time being set to half of a resonance period of an equivalent capacitance of the energy storage element and the piezoelectric element.
6. The method of claim 4 or 5, further comprising controlling the switch to open in response to the on-time having arrived, and/or rendering the switch conductive in response to the on-time not having arrived; and/or controlling the switch connected with the energy storage element to be disconnected in response to the positive voltage or the negative voltage rising or falling from the extreme value to the preset voltage value; and/or in response to the positive voltage or the negative voltage not rising or falling to the preset voltage value, conducting the switch connected with the energy storage element.
7. The method of claim 6, further comprising generating first through fourth control signals; and/or controlling the gating or opening of the first to fourth switches of the switching circuit for piezoelectric energy harvesting, respectively, with the first to fourth control signals; and/or generating the first to fourth control signals and/or a fifth control signal for controlling the on or off of a switch connected to the energy storage element by comparing the positive voltage with a rectified voltage and/or comparing the negative voltage with the rectified voltage, respectively; and/or when the extreme value or the half-period point is detected, the fifth control signal is provided with a high level so as to control the switch connected with the energy storage element to be turned on, and/or when the conduction time is detected to be ended or the positive voltage or the negative voltage of the piezoelectric element is detected to rise or fall from the extreme value to a preset voltage value, the fifth control signal is provided with a low level so as to control the switch connected with the energy storage element to be turned off; and/or the preset value is the divided voltage of the rectified voltage.
8. A non-transitory machine-readable storage medium comprising one or more instructions that in response to being executed result in one or more processing modules performing one or more steps of the method of any of claims 4-7.
9. A control apparatus characterized by comprising:
one or more processing modules;
one or more storage modules coupled with the one or more processing modules, the storage modules to store one or more instructions that, in response to being executed, cause the one or more processing modules to perform one or more steps of the method of any of claims 4-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010073383.0A CN111277170B (en) | 2020-01-20 | 2020-01-20 | Interface circuit and method for piezoelectric energy collection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010073383.0A CN111277170B (en) | 2020-01-20 | 2020-01-20 | Interface circuit and method for piezoelectric energy collection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111277170A CN111277170A (en) | 2020-06-12 |
| CN111277170B true CN111277170B (en) | 2024-03-29 |
Family
ID=71003468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010073383.0A Active CN111277170B (en) | 2020-01-20 | 2020-01-20 | Interface circuit and method for piezoelectric energy collection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111277170B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582599A (en) * | 2009-05-19 | 2009-11-18 | 南京航空航天大学 | Piezoelectric energy recovery device for recovering vibrational energy |
| CN102170226A (en) * | 2011-04-19 | 2011-08-31 | 苏州工业职业技术学院 | A soft switching boost DC-DC converter and a control method thereof |
| CN105634300A (en) * | 2016-01-21 | 2016-06-01 | 湖南大学 | Piezoelectric energy collection rectifier for open-circuit type optimization of turnover time |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6528928B1 (en) * | 2001-08-20 | 2003-03-04 | Ocean Power Technologies, Inc. | Switched resonant power conversion electronics |
| US9548680B2 (en) * | 2014-04-24 | 2017-01-17 | King Saud University | Self power SSHI circuit for piezoelectric energy harvester |
-
2020
- 2020-01-20 CN CN202010073383.0A patent/CN111277170B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582599A (en) * | 2009-05-19 | 2009-11-18 | 南京航空航天大学 | Piezoelectric energy recovery device for recovering vibrational energy |
| CN102170226A (en) * | 2011-04-19 | 2011-08-31 | 苏州工业职业技术学院 | A soft switching boost DC-DC converter and a control method thereof |
| CN105634300A (en) * | 2016-01-21 | 2016-06-01 | 湖南大学 | Piezoelectric energy collection rectifier for open-circuit type optimization of turnover time |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111277170A (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102832792B (en) | Source electrode driving control circuit and control method thereof | |
| EP2658106A1 (en) | Bridgeless power factor correction circuit and method for control thereof | |
| KR101965081B1 (en) | Power conversion device | |
| CN103546047A (en) | Synchronous rectifying circuit suitable for electronic transformer and switch power source | |
| US10742113B2 (en) | Control circuit and control method for outputting pulse width modulation control signal with zero-crossing detection | |
| CN106452086B (en) | A kind of synchronous commutating control circuit | |
| CN106374751B (en) | A kind of synchronous rectification control chip | |
| CN103929048A (en) | Zero-crossing detection circuit of switching power supply | |
| JP2017212795A (en) | Capacitor discharge circuit | |
| CN111277170B (en) | Interface circuit and method for piezoelectric energy collection | |
| CN106452087B (en) | A kind of method for rectifying of synchronous commutating control circuit | |
| US10110139B1 (en) | Matrix converter and method for determining constants of alternating-current motor | |
| JP2010220292A (en) | Power supply apparatus | |
| US11108327B2 (en) | Selected-parameter adaptive switching for power converters | |
| CN106026719B (en) | P-SSHI active rectifying circuits and self-supplied electronic equipment | |
| CN111277169B (en) | Interface circuit for piezoelectric energy collection, control unit and method thereof | |
| EP3447890B1 (en) | Reconfigurable line modulated resonant converter | |
| JP6147423B2 (en) | Power supply circuit | |
| CN108923625B (en) | Synchronous rectifier control method and circuit | |
| JP6969494B2 (en) | Contactless power transmission equipment and power transmission system | |
| CN105515345A (en) | Switching controlling circuit, converter, and switching controlling method | |
| US20180205311A1 (en) | Control of Series-Parallel Mode (SPM) Clamped Flyback Converter | |
| US20180109172A1 (en) | Damper and an electrical energy converting device using the same | |
| CN206226291U (en) | A kind of synchronous commutating control circuit | |
| CN113726219B (en) | Self-switching piezoelectric energy collection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |