CN114935960B - MPPT method suitable for rapid sampling of open-circuit voltage of alternating current energy - Google Patents
MPPT method suitable for rapid sampling of open-circuit voltage of alternating current energy Download PDFInfo
- Publication number
- CN114935960B CN114935960B CN202210374278.XA CN202210374278A CN114935960B CN 114935960 B CN114935960 B CN 114935960B CN 202210374278 A CN202210374278 A CN 202210374278A CN 114935960 B CN114935960 B CN 114935960B
- Authority
- CN
- China
- Prior art keywords
- voltage
- signal
- circuit
- sampling
- open
- 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
- 238000005070 sampling Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims description 40
- 238000003306 harvesting Methods 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 14
- 230000001960 triggered effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005279 excitation period Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of AC or of pulses
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a quick sampling open-circuit voltage MPPT method suitable for alternating current energy, which is applied to an energy acquisition circuit, wherein the energy acquisition circuit comprises the following components: an alternating current source, a sampling hold circuit and a control circuit; the method comprises the following steps: the alternating current source generates a voltage signal and sends the voltage signal to the control circuit and the sample hold circuit; the control circuit carries out peak detection on the voltage signal to obtain peak voltage, and generates sampling signals according to the peak voltage, wherein the sampling signals comprise a first sampling signal and a second sampling signal; the sample hold circuit samples the peak voltage according to the first sampling signal and the second sampling signal to obtain an open-circuit voltage, and determines a maximum power point voltage signal according to the open-circuit voltage. According to the invention, the long charging completion process of the open-circuit voltage on the charging capacitor is not required to be waited, and the open-circuit time is greatly shortened, so that the energy waste is reduced, and the energy collection efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of maximum power point tracking, and particularly relates to a quick sampling open circuit voltage MPPT method suitable for alternating current energy.
Background
MPPT (Maximum Power Point Tracking ) is required in ambient energy harvesting for maximum energy transfer, and open circuit voltage is the most common method.
As shown in fig. 1, in the related art, the open circuit voltage method periodically disconnects S 1 to disconnect the rectifying interface circuit from the MPPT power stage, and waits for V REC 'to reach V OC' on the capacitor C REC ', and then obtains the open circuit voltage V OC' through the sample-and-hold circuit.
However, in the open circuit voltage method, for some energy sources that output ac signals, such as vibration, radio frequency, etc., the sampling open circuit time is limited by the charging capacitance C REC' of the rectifier; in order to make the rectifier output ripple smaller, C REC ' is typically set larger, so that the charging time of the open circuit voltage V OC ' on C REC ' is increased, typically requiring more than ten or even tens of excitation cycles of the energy source, the increase of the open circuit time will result in a decrease of the energy collection efficiency.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a quick sampling open-circuit voltage MPPT method suitable for alternating current energy. The technical problems to be solved by the invention are realized by the following technical scheme:
The invention provides a quick sampling open-circuit voltage MPPT method suitable for alternating current energy, which is applied to an energy acquisition circuit, wherein the energy acquisition circuit comprises the following components: an alternating current source, a sampling hold circuit and a control circuit;
the method for rapidly sampling the open-circuit voltage MPPT applicable to the alternating-current energy comprises the following steps:
the alternating current source generates a voltage signal and sends the voltage signal to the control circuit and the sample hold circuit;
The control circuit carries out peak detection on the voltage signal to obtain peak voltage, and generates sampling signals according to the peak voltage, wherein the sampling signals comprise a first sampling signal and a second sampling signal;
And the sample-hold circuit samples the peak voltage according to the first sampling signal and the second sampling signal to obtain an open-circuit voltage, and determines a maximum power point voltage signal according to the open-circuit voltage.
In one embodiment of the present invention, the control circuit includes a peak detection circuit and a logic generation circuit;
the step that the control circuit carries out peak detection on the voltage signal to obtain peak voltage and generates a sampling signal according to the peak voltage comprises the following steps:
The peak detection circuit receives the voltage signal and carries out peak detection on the voltage signal to obtain peak voltage;
the logic generation circuit generates a sampling signal according to the peak voltage.
In one embodiment of the invention, the alternating current source is a voltage source;
The energy acquisition circuit further comprises a two-stage synchronous rectifier, wherein the two-stage synchronous rectifier comprises a one-stage synchronous rectifier and a two-stage synchronous rectifier; the primary synchronous rectifier is a passive negative-pressure converter, and the secondary synchronous rectifier is an active diode composed of a comparator and a transistor M1.
In one embodiment of the present invention, the first end of the negative voltage converter is connected to the inverting input end of the comparator, the second end is grounded, the first end of the negative voltage converter is connected to the source electrode of M1, the non-inverting input end of the comparator is connected to the drain electrode of M1, and the output end of the comparator is connected to the gate electrode of M1.
In one embodiment of the present invention, the energy harvesting circuit further includes a charging capacitor C REC,CREC, one end of which is connected to the drain of M1, and the other end of which is grounded.
In one embodiment of the present invention, the control circuit performs peak detection on the voltage signal to obtain a peak voltage, and before the step of generating the sampling signal according to the peak voltage, the method further includes:
The alternating current source sends the voltage signal to the two-stage synchronous rectifier;
the two-stage synchronous rectifier shapes the voltage signal and sends the clock signal to the control circuit after generating the clock signal.
In one embodiment of the present invention, the step of shaping the voltage signal by the two-stage synchronous rectifier and transmitting the clock signal to the control circuit after generating the clock signal includes:
The primary synchronous rectifier converts a negative half-cycle signal of the voltage signal into a positive half-cycle signal and sends the positive half-cycle signal to the secondary synchronous rectifier;
And after the secondary synchronous rectifier converts the positive half-cycle signal into a direct-current voltage signal, generating a clock signal according to the direct-current voltage signal and the positive half-cycle signal, and transmitting the clock signal to the control circuit.
In one embodiment of the invention, the control circuit further comprises a frequency divider;
the peak detection circuit receives the voltage signal, and performs peak detection on the clock signal, and before the step of obtaining the peak voltage, the method further includes:
the frequency divider divides the enabling signal to obtain a first signal for triggering the peak detection circuit and the logic generation circuit.
In one embodiment of the present invention, the sample-and-hold circuit includes: the first PMOS tube, the second PMOS tube, the first NMOS tube, the sampling capacitor C S&H1 and the sampling capacitor C S&H2;
The drain electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube, the source electrode of the first PMOS tube is connected with the voltage signal, and the grid electrode of the first PMOS tube is connected with the first sampling signal; one end of the C S&H1 is connected with the drain electrode of the first PMOS tube, and the other end of the C S&H1 is grounded; the drain electrode of the second PMOS tube is connected with the drain electrode of the first NMOS tube, the grid electrode of the second PMOS tube is connected with the second sampling signal, and the source electrode of the second PMOS tube generates a maximum power point voltage signal; the source electrode of the first NMOS tube is grounded, and the grid electrode of the first NMOS tube is connected with a non-signal of a first sampling signal; one end of the C S&H2 is connected with the source electrode of the second PMOS tube, and the other end is grounded
Compared with the prior art, the invention has the beneficial effects that:
The invention provides a quick sampling open circuit voltage MPPT method suitable for alternating current energy, because the MPPT power level stops working in the open circuit sampling period, when a control circuit detects the peak voltage of a voltage signal, a sampling and holding circuit is triggered to sample the peak voltage at the moment, the open circuit voltage can be obtained after processing, the MPPT power level recovers working after 1.5 periods are finished, and the maximum power tracking is carried out according to the obtained open circuit voltage. According to the method, the long charging completion process of the open-circuit voltage on the charging capacitor is not required to be waited, the open-circuit time is greatly shortened, and therefore energy waste is reduced, and energy collection efficiency is improved.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of an open circuit voltage method in the related art;
Fig. 2 is a flowchart of a fast sampling open circuit voltage MPPT method for ac energy according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an energy harvesting circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a control circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another configuration of an energy harvesting circuit according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another configuration of an energy harvesting circuit according to an embodiment of the present disclosure;
FIG. 7 is a circuit diagram of a sample-and-hold circuit provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of waveforms associated with a sample-and-hold circuit during operation according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a simulation waveform of a fast sampling open circuit voltage MPPT method for ac energy according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but embodiments of the present invention are not limited thereto.
Fig. 2 is a flowchart of a fast open-circuit voltage MPPT sampling method suitable for ac energy according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of an energy acquisition circuit according to an embodiment of the present invention. As shown in fig. 2-3, an embodiment of the present invention provides a fast open-circuit voltage MPPT sampling method applicable to ac energy, which is applied to an energy acquisition circuit, the energy acquisition circuit includes: an alternating current source 10, a sample-and-hold circuit 20 and a control circuit 30;
the method for rapidly sampling the open-circuit voltage MPPT applicable to the alternating-current energy comprises the following steps:
S1, an alternating current source 10 generates a voltage signal V p and sends the voltage signal V p to a control circuit 30 and a sample hold circuit 20;
s2, the control circuit 30 carries out peak detection on the voltage signal V p to obtain peak voltage, and generates sampling signals according to the peak voltage, wherein the sampling signals comprise a first sampling signal and a second sampling signal;
and S3, the sample hold circuit 20 samples the peak voltage according to the first sampling signal and the second sampling signal to obtain an open-circuit voltage, and determines a maximum power point voltage signal V SAMPLE according to the open-circuit voltage.
Specifically, the above-mentioned method for rapidly sampling open-circuit voltage MPPT applicable to ac energy is applied to an energy acquisition circuit, as shown in fig. 3, the energy acquisition circuit includes: the alternating current source 10, the sample hold circuit 20 and the control circuit 30, wherein the alternating current source 10 is connected with the control circuit 30 and the sample hold circuit 20 in parallel, and the control circuit 30 is connected with the sample hold circuit 20 in series.
In this embodiment, the ac source 10 first generates the voltage signal V p and sends the voltage signal V p to the control circuit 30 and the sample-and-hold circuit 20, respectively; the control circuit 30 then peak detects the voltage signal V p and generates a sampling signal, optionally comprising a first sampling signal and a second sampling signal. When the control circuit 30 detects a peak value of the voltage signal V p, the sample-and-hold circuit 20 is triggered and samples the peak value according to the first and second sampling signals, resulting in the maximum power point voltage V sample.
Illustratively, the timing of the end of the open circuit sampling is determined by the type of ac source 10 and the interface circuitry, and the open circuit sampling period may be controlled to be within 2 periods.
Fig. 4 is a schematic structural diagram of a control circuit according to an embodiment of the present invention. As shown in fig. 4, the control circuit 30 includes a peak detection circuit 301 and a logic generation circuit 302;
In the step S2, the step of the control circuit 30 performing peak detection on the voltage signal V p to obtain a peak voltage and generating a sampling signal according to the peak voltage includes:
The peak detection circuit 301 receives the voltage signal V p, and performs peak detection on the voltage signal V p to obtain a peak voltage;
The logic generation circuit 302 generates a sampling signal according to the peak voltage.
In this embodiment, the control circuit 30 includes a peak detection circuit 301 and a logic generation circuit 302, wherein a voltage signal V p output by the ac source 10 is connected to an input terminal of the peak detection circuit 301, and an output terminal of the peak detection circuit 301 is connected to an input terminal of the logic generation circuit 302. Specifically, after receiving the voltage signal V p, the peak detection circuit 301 detects the peak voltage of the voltage signal V p, and inputs the peak voltage to the logic generation circuit 302 to obtain the first sampling signal and the second sampling signal.
Fig. 5-6 are schematic diagrams of another configuration of an energy harvesting circuit provided by an embodiment of the present invention. Alternatively, the ac source 10 is a voltage source;
The energy harvesting circuit further comprises a two-stage synchronous rectifier 40, the two-stage synchronous rectifier 40 comprising a one-stage synchronous rectifier and a two-stage synchronous rectifier; the primary synchronous rectifier is a passive negative-pressure converter NVC, and the secondary synchronous rectifier is an active diode composed of a comparator COMP and a transistor M1.
In this embodiment, the ac source 10 may be a power source, and the energy harvesting circuit further includes a two-stage synchronous rectifier 40, i.e. a primary synchronous rectifier and a secondary synchronous rectifier. As shown in fig. 6, the primary synchronous rectifier is a passive negative voltage converter NVC, and the secondary synchronous rectifier is an active diode composed of a comparator COMP and a transistor M1; the first end of the negative pressure converter NVC is connected to the inverting input end of the comparator COMP, the second end of the negative pressure converter NVC is grounded, the first end of the negative pressure converter NVC is connected to the source electrode of the M1, the non-inverting input end of the comparator COMP is connected to the drain electrode of the M1, the output end of the comparator COMP is connected to the gate electrode of the M1, and the M1 may be a PMOS tube.
With continued reference to fig. 6, the energy harvesting circuit further includes a charging capacitor C REC,CREC having one end connected to the drain of M1 and the other end grounded.
When the ac source 10 is a voltage source, the control circuit 30 performs peak detection on the voltage signal V p to obtain a peak voltage, and further includes, before the step of generating the sampling signal according to the peak voltage:
The ac source 10 sends a voltage signal V p to the two-stage synchronous rectifier 40;
The two-stage synchronous rectifier 40 shapes the voltage signal V p and sends the clock signal VCOMP to the control circuit 30 after generating the clock signal VCOMP.
Specifically, when the ac source 10 is a voltage source, the primary synchronous rectifier converts the negative half-cycle signal of the voltage signal V p into the positive half-cycle signal and sends the positive half-cycle signal to the secondary synchronous rectifier, and the secondary synchronous rectifier converts the positive half-cycle signal into the dc voltage signal V p, and further generates the clock signal VCOMP according to the dc voltage signal V p and the positive half-cycle signal and sends the clock signal VCOMP to the control circuit 30.
Optionally, when the ac source 10 is a voltage source, the control circuit 30 further includes a frequency divider;
The peak detection circuit 301 receives the voltage signal V p, and performs peak detection on the clock signal VCOMP to obtain a peak voltage, and before the step of obtaining the peak voltage, the step further includes:
The frequency divider divides the enable signal to obtain a first signal for triggering the peak detection circuit 301 and the logic generation circuit 302.
In this embodiment, the input signal of the frequency divider is the clock signal VCOMP output by the comparator COMP in the active diode, and the function of the frequency divider is to divide the clock signal VCOMP to obtain the first signal DIV, which is used as the enable signal of the peak detection circuit 301 and the logic generation circuit 302 to trigger the peak detection circuit 301 and the logic generation circuit 302 to operate.
During open sampling, the peak detection circuit 301 generates an output signal V P _pd by detecting the peak value of the output VP of the voltage source, which is connected to the logic generation circuit 302, causing the logic generation circuit 302 to generate the first sampling signal sample_1 and the second sampling signal sample_2. When the control circuit 30 starts to operate, the first signal DIV transitions to a high level, the V P PD signal immediately generates a first pulse, and then the peak detection circuit 301 operates normally; when the peak detection circuit 301 detects a first peak of the voltage signal V p, a second pulse of the V P _pd signal occurs; when the peak detection circuit 301 detects the second peak of the voltage signal V p, the third pulse of the V P —pd signal occurs, at which point the control circuit 30 has completed the sampling process for 1.5 periods of the voltage source.
Fig. 7 is a circuit diagram of a sample-and-hold circuit according to an embodiment of the present invention. As shown in fig. 7, the sample hold circuit 20 includes: the first PMOS tube (PMOS 1), the second PMOS tube (PMOS 2), the first NMOS tube (NOMS 1), the sampling capacitor C S&H1 and the sampling capacitor C S&H2;
The drain electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube, the source electrode of the first PMOS tube is connected with the voltage signal V p, and the grid electrode of the first PMOS tube is connected with the first sampling signal; one end of the C S&H1 is connected with the drain electrode of the first PMOS tube, and the other end of the C S&H1 is grounded; the drain electrode of the second PMOS tube is connected with the drain electrode of the first NMOS tube, the grid electrode of the second PMOS tube is connected with the second sampling signal, and the source electrode of the second PMOS tube generates a maximum power point voltage signal V SAMPLEVp; the source electrode of the first NMOS tube is grounded, and the grid electrode of the first NMOS tube is connected with a non-signal of a first sampling signal; one end of the C S&H2 is connected with the source electrode of the second PMOS tube, and the other end of the C S&H2 is grounded.
Fig. 8 is a schematic diagram of waveforms related to the operation of the sample-and-hold circuit according to the embodiment of the present invention. Referring to fig. 8, in the present embodiment, the peak voltage of the voltage signal V p is 2V, and when the voltage signal V p has a first peak value during the open sampling period, the sampling signal has a low level pulse, so as to control the transistor M1 to be turned on and start sampling the peak voltage. As shown in fig. 8, in the amplified waveform, the first sampling signal sample_1 pulse is wider than the second sampling signal pulse width because sample_1 is required to obtain an accurate 2 times open circuit voltage value from the voltage signal V p, and the second sampling signal only needs to divide two small sampling capacitors in parallel, so that much time is not required and the pulse time is short. When the sample_1 pulse arrives, v_cs & h2=2 VOC, and v_cs & h2=0; after arrival of the sample_2 pulse, CS & H1 and CS & H2 bisect the charge, v_cs & h2=v_cs & h1=voc.
Fig. 9 is a schematic diagram of a simulation waveform of a fast sampling open circuit voltage MPPT method for ac energy according to an embodiment of the present invention. As shown in fig. 9, V P and V N are voltages across the power supply, respectively, and as can be seen from waveforms of V P and V N, the power supply successfully charges and discharges freely on the parasitic capacitance CP, and generates a voltage waveform consistent with the theoretical analysis on V P, a voltage peak occurs, and when the second voltage peak occurs, the free charge and discharge ends, for a total of 1.5 excitation periods.
According to the above embodiments, the beneficial effects of the invention are as follows:
The invention provides a quick sampling open circuit voltage MPPT method suitable for alternating current energy, because the MPPT power level stops working in the open circuit sampling period, when a control circuit detects the peak voltage of a voltage signal, a sampling and holding circuit is triggered to sample the peak voltage at the moment, the open circuit voltage can be obtained after processing, the MPPT power level recovers working after 1.5 periods are finished, and the maximum power tracking is carried out according to the obtained open circuit voltage. According to the method, the long charging completion process of the open-circuit voltage on the charging capacitor is not required to be waited, the open-circuit time is greatly shortened, and therefore energy waste is reduced, and energy collection efficiency is improved.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (7)
1. The utility model provides a quick sampling open circuit voltage MPPT method suitable for alternating current energy which characterized in that is applied to energy acquisition circuit, the energy acquisition circuit includes: an alternating current source, a sampling hold circuit and a control circuit;
the method for rapidly sampling the open-circuit voltage MPPT applicable to the alternating-current energy comprises the following steps:
the alternating current source generates a voltage signal and sends the voltage signal to the control circuit and the sample hold circuit;
The control circuit carries out peak detection on the voltage signal to obtain peak voltage, and generates sampling signals according to the peak voltage, wherein the sampling signals comprise a first sampling signal and a second sampling signal;
the sampling and holding circuit samples peak voltage according to the first sampling signal and the second sampling signal to obtain open-circuit voltage, and determines a maximum power point voltage signal according to the open-circuit voltage; wherein,
The alternating current source is a voltage source;
The energy acquisition circuit further comprises a two-stage synchronous rectifier, wherein the two-stage synchronous rectifier comprises a one-stage synchronous rectifier and a two-stage synchronous rectifier; the primary synchronous rectifier is a passive negative-pressure converter, and the secondary synchronous rectifier is an active diode formed by a comparator and a transistor (M1);
The first end of the negative voltage converter is connected with the inverting input end of the comparator, the second end of the negative voltage converter is grounded, the first end of the negative voltage converter is connected with the source electrode of the transistor (M1), the non-inverting input end of the comparator is connected with the drain electrode of the transistor (M1), and the output end of the comparator is connected with the grid electrode of the transistor (M1).
2. The method for fast sampling open circuit voltage MPPT applied to ac energy according to claim 1, wherein the control circuit comprises a peak detection circuit and a logic generation circuit;
the step that the control circuit carries out peak detection on the voltage signal to obtain peak voltage and generates a sampling signal according to the peak voltage comprises the following steps:
The peak detection circuit receives the voltage signal and carries out peak detection on the voltage signal to obtain peak voltage;
the logic generation circuit generates a sampling signal according to the peak voltage.
3. The method for fast sampling open circuit voltage MPPT applied to ac energy according to claim 1, wherein the energy harvesting circuit further comprises a charging capacitor C REC,CREC having one end connected to the drain of the transistor (M1) and the other end grounded.
4. The method for rapidly sampling an open circuit voltage MPPT applied to ac energy according to claim 2, wherein said control circuit performs peak detection on a voltage signal to obtain a peak voltage, and further comprises, before the step of generating a sampling signal according to said peak voltage:
The alternating current source sends the voltage signal to the two-stage synchronous rectifier;
the two-stage synchronous rectifier shapes the voltage signal and sends the clock signal to the control circuit after generating the clock signal.
5. The method for fast sampling open circuit voltage MPPT applied to ac energy according to claim 4, wherein the step of the two-stage synchronous rectifier shaping the voltage signal and sending the clock signal to the control circuit after generating the clock signal comprises:
The primary synchronous rectifier converts a negative half-cycle signal of the voltage signal into a positive half-cycle signal and sends the positive half-cycle signal to the secondary synchronous rectifier;
And after the secondary synchronous rectifier converts the positive half-cycle signal into a direct-current voltage signal, generating a clock signal according to the direct-current voltage signal and the positive half-cycle signal, and transmitting the clock signal to the control circuit.
6. The method for fast sampling open circuit voltage MPPT applied to ac energy of claim 4, wherein said control circuit further comprises a frequency divider;
the peak detection circuit receives the voltage signal, and performs peak detection on the clock signal, and before the step of obtaining the peak voltage, the method further includes:
The frequency divider divides the enable signal to obtain a first signal for triggering the peak detection circuit and the logic generation circuit.
7. The method for fast sampling open circuit voltage MPPT applied to ac energy according to claim 1, wherein said sample-and-hold circuit comprises: the first PMOS tube, the second PMOS tube, the first NMOS tube, the sampling capacitor C S&H1 and the sampling capacitor C S&H2;
The drain electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube, the source electrode of the first PMOS tube is connected with the voltage signal, and the grid electrode of the first PMOS tube is connected with the first sampling signal; one end of the C S&H1 is connected with the drain electrode of the first PMOS tube, and the other end of the C S&H1 is grounded; the drain electrode of the second PMOS tube is connected with the drain electrode of the first NMOS tube, the grid electrode of the second PMOS tube is connected with the second sampling signal, and the source electrode of the second PMOS tube generates a maximum power point voltage signal; the source electrode of the first NMOS tube is grounded, and the grid electrode of the first NMOS tube is connected with a non-signal of a first sampling signal; one end of the C S&H2 is connected with the source electrode of the second PMOS tube, and the other end of the C S&H2 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210374278.XA CN114935960B (en) | 2022-04-11 | 2022-04-11 | MPPT method suitable for rapid sampling of open-circuit voltage of alternating current energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210374278.XA CN114935960B (en) | 2022-04-11 | 2022-04-11 | MPPT method suitable for rapid sampling of open-circuit voltage of alternating current energy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114935960A CN114935960A (en) | 2022-08-23 |
| CN114935960B true CN114935960B (en) | 2024-10-22 |
Family
ID=82861627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210374278.XA Active CN114935960B (en) | 2022-04-11 | 2022-04-11 | MPPT method suitable for rapid sampling of open-circuit voltage of alternating current energy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114935960B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344816A (en) * | 2013-07-10 | 2013-10-09 | 成都芯源系统有限公司 | Method and circuit for sampling peak value of alternating voltage and switch converter applying circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08105921A (en) * | 1994-10-07 | 1996-04-23 | Meidensha Corp | Ac voltage detecting circuit |
| CN105158550A (en) * | 2015-07-22 | 2015-12-16 | 珠海格力电器股份有限公司 | Switching power supply and voltage peak value detection device and method thereof |
| MY194129A (en) * | 2015-11-19 | 2022-11-14 | Sigmagen Inc | Multi-modal maximum power point tracking optimzation solar photovoltaic system |
| CN108809145B (en) * | 2018-04-24 | 2019-12-13 | 西安电子科技大学 | Maximum power point tracking control piezoelectric energy acquisition circuit |
| CN111740598B (en) * | 2020-07-02 | 2022-02-11 | 重庆邮电大学 | A low-power load current detection circuit for PWM DC-DC converters |
-
2022
- 2022-04-11 CN CN202210374278.XA patent/CN114935960B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344816A (en) * | 2013-07-10 | 2013-10-09 | 成都芯源系统有限公司 | Method and circuit for sampling peak value of alternating voltage and switch converter applying circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114935960A (en) | 2022-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106208714B (en) | Synchronous rectifying switching power source and control method | |
| US11056981B2 (en) | Method and apparatus for signal extraction with sample and hold and release | |
| EP2339726B1 (en) | Power factor corrector with high power factor at low load or high mains voltage conditions | |
| US10330711B2 (en) | Method and device for detecting current of inductor of PFC circuit | |
| CN103701321B (en) | A kind of fast transient response buck synchronous rectified DC-DC converter | |
| CN102067427B (en) | Power converter | |
| CN204046448U (en) | Output voltage dynamic sampling circuit in AC-DC converter | |
| US20230408592A1 (en) | Battery protection chip, polling detection circuit and method based on battery protection chip | |
| Liu et al. | A 1.5-cycle fast sampling P-SSHC piezoelectric energy harvesting interface | |
| Li et al. | Piezoelectric energy harvesting interface using self-bias-flip rectifier and switched-PEH DC–DC for MPPT | |
| CN112104203B (en) | Switch current limiting circuit and power chip | |
| CN114935960B (en) | MPPT method suitable for rapid sampling of open-circuit voltage of alternating current energy | |
| CN111200361B (en) | Self-powered dual-input and dual-output energy collection circuit with maximum power tracking function | |
| Chen et al. | A highly adaptive and flipping-time optimized piezoelectric energy harvesting interface IC with synchronized triple bias-flip | |
| Liu et al. | MPPT multiplexed hybrid energy harvesting interface with adaptive switching cycle and single-cycle sampling for wearable electronics | |
| CN102608410B (en) | Pulse generation circuit, voltage measuring circuit and voltage measuring method | |
| CN104503526A (en) | Feedback compensation circuit and method based on mixed signals | |
| CN115173863A (en) | Knee point detection circuit based on slope detection | |
| CN116581984A (en) | Control method, control device, control chip and switching power supply | |
| CN112787656B (en) | Sample-hold control method, device and host | |
| CN213094077U (en) | Synchronous rectification control circuit and flyback switching power supply | |
| CN211791271U (en) | A self-powered dual-input dual-output energy harvesting circuit with maximum power tracking | |
| CN114598169A (en) | A kind of control method for synchronous rectification buck circuit in DCM mode | |
| CN211453859U (en) | Demagnetization time detection circuit and power supply device | |
| CN209767367U (en) | self-powered circuit and control chip of switching power supply, switching power supply and electrical device |
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 |