CN112051884B - Maximum power point tracking device for energy collection system - Google Patents
Maximum power point tracking device for energy collection system Download PDFInfo
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- CN112051884B CN112051884B CN202010941766.5A CN202010941766A CN112051884B CN 112051884 B CN112051884 B CN 112051884B CN 202010941766 A CN202010941766 A CN 202010941766A CN 112051884 B CN112051884 B CN 112051884B
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- 238000005070 sampling Methods 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 6
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 6
- 239000004065 semiconductor Substances 0.000 claims abstract description 6
- 238000003306 harvesting Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- 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
Abstract
The invention discloses a maximum power point tracking device for an energy collection system, which comprises an energy collection device, an inductor, a PMOS (P-channel metal oxide semiconductor) tube MP, an NMOS (N-channel metal oxide semiconductor) tube MN, a load capacitor C, a pulse generation circuit, a switch control unit, a delay unit, a logic gate, a driving stage, a comparator, a Voc sampling module and an MPP output module. The invention adopts the switch control and current conversion technology to reduce the effective maximum power sampling and tracking time. The invention adopts the rapid boost converter based on the current holding technology, can avoid using large input capacitance, and can reduce the energy loss in the sampling process while reducing the area. Compared with the traditional maximum power point tracking device, the device has a simple structure, can obviously reduce the tracking time and improve the power conversion efficiency.
Description
Technical Field
The invention belongs to the technical field of integrated circuit design and manufacture, and relates to a maximum power point tracking device for an energy collection system.
Background
Maximum Power Point Tracking (MPPT) is generally applied to energy collection systems, and is commonly used in power management units. Maximum power point tracking functions to identify the maximum available power from the front-end energy harvesting devices in the energy harvesting system for extending the useful life of the device. Common maximum power point tracking methods include P & O and FOCV. The FOCV method is commonly used in low power applications, and the main principle is to find the maximum power point by the linear relationship between the open circuit voltage, the output voltage Voc, and the MPP voltage.
In the conventional energy collection application, the discontinuous conduction mode needs to periodically turn off the power management unit and simultaneously perform the Voc sampling, and if the time needs to be reduced and the efficiency needs to be improved, the Voc sampling and the MPP voltage fast tracking need to be accelerated. However, the large input capacitance of the MPPT input end limits the rapid sampling and calculation of Voc; in the continuous conduction mode, although the input capacitance is small, the maximum power point current in the inductor is large, the current needs to be discharged quickly in the sampling process, and the size of the discharged current is in direct proportion to the output power of the system, so that effective quick sampling and tracking are difficult to realize.
Disclosure of Invention
In view of the above problems, the present invention provides a maximum power point tracking device for an energy collection system. The device has simple system structure, for traditional maximum power point tracking device, can show the energy collection efficiency that promotes for the tracking time.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a maximum power point tracking device for energy collecting system, includes energy collecting device, inductance, PMOS pipe MP, NMOS pipe MN, load capacitance C, pulse generation circuit, on-off control unit, delay unit, logic gate, drive stage, comparator, Voc sampling and MPP output module, wherein:
the output end of the energy collecting device is respectively connected with the input end of the inductor, the input end of the switch control unit, the input end of the Voc sampling and MPP output module and the input end of the comparator;
the output end of the inductor is respectively connected with the source electrode of the PMOS tube MP, the output end of the switch control unit and the drain electrode of the NMOS tube MN;
the other input end of the switch control unit is connected with one output end of the delay unit;
one output end of the pulse generating circuit is connected with the input end of the delay unit, and the other output end of the pulse generating circuit is respectively connected with one input end of the logic gate and the other input end of the Voc sampling and MPP output module;
the other output end of the delay unit is connected with one input end of the driving stage;
the other input end of the logic gate is connected with the output end of the comparator, and the output end of the logic gate is connected with the other input end of the driving stage;
one output end of the driving stage is connected with the grid electrode of the PMOS tube MP, and the other output end of the driving stage is connected with the grid electrode of the NMOS tube MN;
the output end of the Voc sampling and MPP output module is connected with the other input end of the comparator;
the drain electrode of the PMOS tube MP is connected with one end of a load capacitor C, and the other end of the load capacitor C is grounded;
and the source electrode of the NMOS transistor MN is grounded.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts the switch control and current conversion technology to reduce the effective maximum power sampling and tracking time.
2. The invention adopts the rapid boost converter based on the current holding technology, can avoid using large input capacitance, and can reduce the energy loss in the sampling process while reducing the area.
3. Compared with the traditional maximum power point tracking device, the device has a simple structure, can obviously reduce the tracking time and improve the power conversion efficiency.
Drawings
Fig. 1 is a functional block diagram of a maximum power point tracking device for an energy collection system.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The invention provides a maximum power point tracking device for an energy collection system, as shown in fig. 1, the maximum power point tracking device comprises an energy collection device, an inductor, a PMOS (P-channel metal oxide semiconductor) transistor MP, an NMOS (N-channel metal oxide semiconductor) transistor MN, a load capacitor C, a pulse generation circuit, a switch control unit, a delay unit, a logic gate, a driving stage, a comparator, a Voc sampling module and an MPP output module, wherein:
the output end of the energy collecting device is respectively connected with the input end of the inductor, the input end of the switch control unit, the input end of the Voc sampling and MPP output module and the input end of the comparator;
the output end of the inductor is respectively connected with the source electrode of the PMOS tube MP, the output end of the switch control unit and the drain electrode of the NMOS tube MN;
the other input end of the switch control unit is connected with one output end of the delay unit;
one output end of the pulse generating circuit is connected with the input end of the delay unit, and the other output end of the pulse generating circuit is respectively connected with one input end of the logic gate and the other input end of the Voc sampling and MPP output module;
the other output end of the delay unit is connected with one input end of the driving stage;
the other input end of the logic gate is connected with the output end of the comparator, and the output end of the logic gate is connected with the other input end of the driving stage;
one output end of the driving stage is connected with the grid electrode of the PMOS tube MP, and the other output end of the driving stage is connected with the grid electrode of the NMOS tube MN;
the output end of the Voc sampling and MPP output module is connected with the other input end of the comparator;
the drain electrode of the PMOS tube MP is connected with one end of a load capacitor C, and the other end of the load capacitor C is grounded;
and the source electrode of the NMOS transistor MN is grounded.
In the invention, the switch control unit is a switch controlled by the output pulse of the delay unit, and the common realization form is an MOS tube switch or a CMOS tube switch.
In the invention, the Voc sampling and MPP output module generally consists of an operational amplifier and a switched capacitor circuit, and any type of variation belongs to the protection scope of the invention.
In the present invention, the common implementation form of the comparator is a simple single-stage open-loop operational amplifier, and any variation of the comparator falls within the protection scope of the present invention.
In the invention, the driving stage consists of a non-overlapping logic control unit and an output stage of an output large-size MOS tube, and any variation belongs to the protection scope of the invention.
In power management applications, the energy harvesting device is typically a voltage source with an internal resistance. The periodic sampling signal output by the pulse generating circuit controls Voc sampling. When the sampling signal is small, the system works in a rated boosting mode; when the input signal at the next moment is higher than the MPP output voltage amplitude of Voc sampling, the comparator outputs high level, and the driving stage is controlled through the logic gate to charge a path where the inductor is located. As the current continues to increase, the input signal amplitude begins to decrease. When the signal amplitude is lower than the output voltage of MPP, the output of the comparator is pulled low, at the moment, the path where the inductor is located starts to discharge, the amplitude of the input signal starts to increase, and the steps are repeated. The ripple control in the whole process stabilizes the amplitude of the input signal near the output voltage of the MPP, and the output capacitor C obtains and stores the maximum available power from the voltage source.
When the sampling signal is higher, the value of Voc sampling is used for recalculating the output voltage of MPP, the output of the driving stage closes the MOS tubes MP and MN at the same time, the switch controls the short-circuit inductance branch to form a protection loop, and the loop of the system is open at the moment. Since the output of the energy harvesting device has no direct large capacitive load (Voc sampling capacitance only in the order of pF), the tracking time constant can be significantly reduced.
The invention can be applied to a typical power management module for dynamic management of power conversion, and can remarkably reduce conversion time and effectively improve the efficiency of a power supply because a large capacitive load at an input end is not required.
Claims (6)
1. The maximum power point tracking device for the energy collection system is characterized by comprising an energy collection device, an inductor, a PMOS (P-channel metal oxide semiconductor) tube MP, an NMOS (N-channel metal oxide semiconductor) tube MN, a load capacitor C, a pulse generation circuit, a switch control unit, a delay unit, a logic gate, a driving stage, a comparator, a Voc sampling module and an MPP output module, wherein:
the output end of the energy collecting device is respectively connected with the input end of the inductor, the input end of the switch control unit, the input end of the Voc sampling and MPP output module and the input end of the comparator;
the output end of the inductor is respectively connected with the source electrode of the PMOS tube MP, the output end of the switch control unit and the drain electrode of the NMOS tube MN;
the other input end of the switch control unit is connected with one output end of the delay unit;
one output end of the pulse generating circuit is connected with the input end of the delay unit, and the other output end of the pulse generating circuit is respectively connected with one input end of the logic gate and the other input end of the Voc sampling and MPP output module;
the other output end of the delay unit is connected with one input end of the driving stage;
the other input end of the logic gate is connected with the output end of the comparator, and the output end of the logic gate is connected with the other input end of the driving stage;
one output end of the driving stage is connected with the grid electrode of the PMOS tube MP, and the other output end of the driving stage is connected with the grid electrode of the NMOS tube MN;
the output end of the Voc sampling and MPP output module is connected with the other input end of the comparator;
the drain electrode of the PMOS tube MP is connected with one end of a load capacitor C, and the other end of the load capacitor C is grounded;
and the source electrode of the NMOS transistor MN is grounded.
2. The maximum power point tracking device for an energy harvesting system according to claim 1, wherein the switching control unit is implemented in the form of a MOS transistor switch or a CMOS transistor switch.
3. The maximum power point tracking device for an energy harvesting system of claim 1 wherein said Voc sampling and MPP output module is comprised of an op-amp and switched capacitor circuit.
4. The maximum power point tracking device for an energy harvesting system of claim 1, wherein the comparator is implemented in the form of a simple single stage open loop op-amp.
5. The maximum power point tracking device for an energy harvesting system according to claim 1, wherein the driving stage is comprised of a non-overlapping logic control unit and an output large size MOS transistor output stage.
6. The maximum power point tracking device for an energy harvesting system according to claim 1, wherein the energy harvesting device is a voltage source with an internal resistance.
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| CN202010941766.5A CN112051884B (en) | 2020-09-09 | 2020-09-09 | Maximum power point tracking device for energy collection system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820777A (en) * | 2012-08-20 | 2012-12-12 | 浙江大学 | Boost converter applicable to new energy |
| CN103529899A (en) * | 2013-10-17 | 2014-01-22 | 深圳市禾望电气有限公司 | MPPT controller, power tracking device, photovoltaic power generation and energy storage system |
| CN109753103A (en) * | 2019-01-30 | 2019-05-14 | 长安大学 | A kind of maximal power tracing control system for collection of energy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9541587B2 (en) * | 2014-02-26 | 2017-01-10 | Fsp Technology Inc. | Inverting apparatus for avoiding misjudgement of maximum power point tracking operation and control method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820777A (en) * | 2012-08-20 | 2012-12-12 | 浙江大学 | Boost converter applicable to new energy |
| CN103529899A (en) * | 2013-10-17 | 2014-01-22 | 深圳市禾望电气有限公司 | MPPT controller, power tracking device, photovoltaic power generation and energy storage system |
| CN109753103A (en) * | 2019-01-30 | 2019-05-14 | 长安大学 | A kind of maximal power tracing control system for collection of energy |
Non-Patent Citations (2)
| Title |
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| A Current Sensorless MPPT Algorithm For A Low-cost PV Array Controller;Jiachen Li;《IEEE》;20170727;全文 * |
| 基于粒子群算法的最大功率点跟踪方法研究;赵阳等;《电力电子技术》;20100620;全文 * |
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