CN205070581U - Photovoltaic charging circuit - Google Patents
Photovoltaic charging circuit Download PDFInfo
- Publication number
- CN205070581U CN205070581U CN201520858706.1U CN201520858706U CN205070581U CN 205070581 U CN205070581 U CN 205070581U CN 201520858706 U CN201520858706 U CN 201520858706U CN 205070581 U CN205070581 U CN 205070581U
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- resistor
- triode
- mcu
- charging circuit
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- 238000001514 detection method Methods 0.000 claims description 11
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a photovoltaic charging circuit, it includes PMOS switch tube (Q1), diode (D1), battery, the battery voltage detecting element who is used for detecting battery both ends voltage, single chip microcomputer control unit (MCU) and overcharge protection unit. The source electrode of PMOS switch tube (Q1) is connected with the positive pole (PV+) of photovoltaic cell subassembly, and grid and overcharge protection unit connection are connected with the anodal of diode (D1) to the drain electrode. The negative pole of diode (D1) is connected with battery and battery voltage detecting element respectively. Single chip microcomputer control unit (MCU) and battery voltage detecting element and overcharge protection unit connection.
Description
Technical Field
The utility model relates to a photovoltaic charging technology field especially relates to a photovoltaic charging circuit that can effectively avoid single chip microcomputer control unit to take place unusually.
Background
In the charging circuit of the photovoltaic off-grid system controller, the single chip microcomputer plays an important role in charge and discharge management, system indication and overcharge protection. As shown in fig. 1, a charging circuit of a photovoltaic grid system is commonly used, and a single chip microcomputer directly takes electricity from a storage battery through a dc converter. However, as can be seen from the figure, since the charging link of the storage battery is controlled by the MCU and the storage battery is required to supply power to the storage battery, the storage battery is easily over-discharged during the use process, which causes abnormal power supply to the storage battery, and the charging process cannot be performed, resulting in a crash phenomenon, so that the storage battery can be directly charged only by dismantling the machine, and the use can be resumed.
Therefore, there is a need to provide an improved photovoltaic charging circuit to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can effectively avoid singlechip control unit to take place photovoltaic charging circuit of unusual crash.
In order to achieve the above object of the present invention, the present invention provides a photovoltaic charging circuit, which comprises a PMOS switch tube (Q1), a diode (D1), a battery voltage detection unit for detecting the voltage across the battery, a single-chip control unit (MCU), and an overcharge protection unit; the source electrode of the PMOS switching tube (Q1) is connected with the anode (PV +) of the photovoltaic cell module, the drain electrode of the PMOS switching tube is connected with the anode of the diode (D1), and the grid electrode of the PMOS switching tube is connected with the overcharge protection unit; the overcharge protection unit comprises a first resistor (R1) and a second resistor (R2) which are connected in series, a third resistor (R3) and a first triode (Q3) which are connected in series, a fourth resistor (R4) and a second triode (Q5); the 1 end of the first resistor (R1) is connected with the positive electrode (PV +) of the photovoltaic cell assembly, the 1 end of the third resistor (R3) and the source electrode of the PMOS switching tube (Q1), and the 2 end of the first resistor (R1) is connected with the 1 end of the second resistor (R2), the base electrode of the first triode (Q3) and the collector electrode of the second triode (Q5); the 2 end of the third resistor (R3) is connected with the collector of the first triode (Q3) and the grid of the PMOS switching tube (Q1); the emitter of the first triode (Q3) is connected with the 2 end of the second resistor (R2), the emitter of the second triode (Q5) and the negative electrode (PV-) of the photovoltaic cell assembly; the 1 end of the fourth resistor (R4) is connected with a single chip Microcomputer Control Unit (MCU), and the 2 end is connected with the base electrode of a second triode (Q5); the resistance value of the first resistor (R1) is smaller than that of the second resistor (R2); the cathode of the diode (D1) is respectively connected with the storage battery and the battery voltage detection unit; and the single chip Microcomputer Control Unit (MCU) is connected with the battery voltage detection unit.
As a further improvement of the present invention, the resistance of the second resistor (R2) is at least five times the resistance of the first resistor (R1).
As a further improvement of the present invention, the battery voltage detection unit includes a fifth resistor (R5) and a sixth resistor (R6); the 1 end of the fifth resistor (R5) is respectively connected with the cathode of the diode (D1) and the anode of the storage battery, and the 2 end of the fifth resistor (R5) is respectively connected with the 1 end of the sixth resistor (R6) and the single chip Microcomputer Control Unit (MCU); and the 2 end of the sixth resistor (R6) is respectively connected with the negative electrode of the storage battery, the emitter of the first triode (Q3), the emitter of the second triode (Q5) and the negative electrode (PV-) of the photovoltaic cell module.
As a further improvement of the present invention, the resistance of the fifth resistor (R5) is greater than the resistance of the sixth resistor (R6).
As a further improvement of the utility model, a DC/DC converter is also arranged between the cathode of the diode (D1) and the single chip control unit (MCU).
The utility model has the advantages that: the single chip Microcomputer Control Unit (MCU) among the photovoltaic charging circuit still undertakes the important function of charge-discharge management and protection to adopt the DC/DC converter to get the electricity from the battery, nevertheless, the utility model discloses single chip Microcomputer Control Unit (MCU) is responsible for overcharging protect function only through overcharging the protect cell to the charge management, only receives when single chip Microcomputer Control Unit (MCU) that the battery voltage that battery voltage detecting element detected is higher than the threshold value of setting just through overcharging protect cell disconnection PMOS switch tube (Q1), and the charge under the normal condition passes through photovoltaic cell module's input control. Therefore, the problem that a single chip control unit (MCU) is halted under the condition that the storage battery is seriously overdischarged can be effectively avoided.
Drawings
Fig. 1 is a schematic circuit diagram of a photovoltaic charging circuit in the prior art.
Fig. 2 is a schematic circuit diagram of the photovoltaic charging circuit of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present invention will be described in detail below with reference to embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and structural or functional changes made by those skilled in the art according to these embodiments are all included in the scope of the present invention.
Fig. 2 shows a preferred embodiment of the photovoltaic charging circuit of the present invention. The photovoltaic charging circuit comprises a PMOS (P-channel metal oxide semiconductor) switching tube (Q1), a diode (D1), a storage battery, a battery voltage detection unit for detecting voltages at two ends of the storage battery, a single chip Microcomputer Control Unit (MCU) and an overcharge protection unit.
The source electrode of the PMOS switching tube (Q1) is connected with the positive electrode (PV +) of the photovoltaic cell assembly, the drain electrode of the PMOS switching tube is connected with the positive electrode of the diode (D1), and the grid electrode of the PMOS switching tube is connected with the overcharge protection unit.
The overcharge protection unit comprises a first resistor (R1) and a second resistor (R2) which are connected in series, a third resistor (R3) and a first triode (Q3) which are connected in series, a fourth resistor (R4) and a second triode (Q5). The 1 end of the first resistor (R1) is connected with the positive electrode (PV +) of the photovoltaic cell assembly, the 1 end of the third resistor (R3) and the source electrode of the PMOS switching tube (Q1); and the 2 end of the first resistor (R1) is connected with the 1 end of the second resistor (R2), the base electrode of the first triode (Q3) and the collector electrode of the second triode (Q5). And the 2 end of the third resistor (R3) is connected with the collector of the first triode (Q3) and the gate of the PMOS switching tube (Q1). And the emitter of the first triode (Q3) is connected with the 2 end of the second resistor (R2), the emitter of the second triode (Q5) and the negative electrode (PV-) of the photovoltaic cell assembly. And the 1 end of the fourth resistor (R4) is connected with a single chip Microcomputer Control Unit (MCU), and the 2 end of the fourth resistor is connected with the base electrode of a second triode (Q5).
The resistance value of the first resistor (R1) is smaller than that of the second resistor (R2). The resistance of the second resistor (R2) may be set to be at least five times that of the first resistor (R1), specifically, in this embodiment, the resistance of the first resistor (R1) is 100K Ω, and the resistance of the second resistor (R2) is 510K Ω. The resistance value of the second resistor (R2) is larger than that of the first resistor (R1), the switching-on threshold value of the input voltage can be changed through the resistance value relation, the base voltage of the first triode (Q3) is guaranteed to be higher than the switching-on voltage through the voltage division of the first resistor (R1) and the second resistor (R2) on the photovoltaic battery assembly, and then the PMOS switching tube (Q1) is in a conducting state.
The battery voltage detection unit includes a fifth resistor (R5) and a sixth resistor (R6). The resistance value of the fifth resistor (R5) is larger than that of the sixth resistor (R6), so that the voltage at two ends of the sixth resistor (R6) is matched with the voltage of a single chip Microcomputer Control Unit (MCU). The resistance of the fifth resistor (R5) and the sixth resistor (R6) may be 5: 1.
specifically, the 1 end of the fifth resistor (R5) is respectively connected with the cathode of the diode (D1) and the anode of the storage battery, and the 2 end of the fifth resistor (R5) is respectively connected with the 1 end of the sixth resistor (R6) and the singlechip control unit. And the 2 end of the sixth resistor (R6) is respectively connected with the negative electrode of the storage battery, the emitter of the first triode (Q3), the emitter of the second triode (Q5) and the negative electrode (PV-) of the photovoltaic cell module.
The cathode of the diode (D1) is also connected with the anode of the storage battery. In addition, a DC/DC converter is also arranged between the cathode of the diode (D1) and the single chip Microcomputer Control Unit (MCU).
It can be known from the above description and from fig. 2, the utility model discloses photovoltaic charging circuit's theory of operation does: the resistance value of the second resistor (R2) is larger than that of the first resistor (R1), the switching-on threshold of the input voltage can be changed through the resistance value relation, the base voltage of the first triode (Q3) is guaranteed to be higher than the switching-on voltage through the voltage division of the first resistor (R1) and the second resistor (R2) on the photovoltaic battery assembly, and then the PMOS switching tube (Q1) is in a conducting state; however, although the PMOS switch transistor (Q1) is in the on state, the charging operation can occur only when the input voltage value is greater than the sum of the battery voltage and the voltage drop of the diode (D1). When the single chip Microcomputer Control Unit (MCU) detects that the voltage of the storage battery reaches the overcharge protection threshold value through the battery voltage detection unit, a high level is sent out, the second triode (Q5) is conducted, the base voltage of the first triode (Q3) is pulled down, the PMOS switch tube (Q1) is closed, and the overcharge protection function is achieved.
By the above, the utility model discloses singlechip control unit (MCU) among the photovoltaic charging circuit still undertakes the important function of charge-discharge management and protection to adopt the DC/DC converter to get the electricity from the battery, nevertheless, the utility model discloses singlechip control unit (MCU) is responsible for overcharging protect function only through overcharging the protect unit to the charge management, only receives when singlechip control unit (MCU) that the battery voltage that battery voltage detecting element detected is higher than the threshold value of setting just through overcharging protect unit disconnection PMOS switch tube, and charges under the normal condition and pass through photovoltaic cell module's input control. Therefore, the problem that a single chip control unit (MCU) is halted under the condition that the storage battery is seriously overdischarged can be effectively avoided.
The above detailed description is only for the purpose of illustrating the practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A photovoltaic charging circuit, characterized by: the photovoltaic charging circuit comprises a PMOS (P-channel metal oxide semiconductor) switching tube (Q1), a diode (D1), a storage battery, a battery voltage detection unit for detecting voltages at two ends of the storage battery, a single chip Microcomputer Control Unit (MCU) and an overcharge protection unit; wherein,
the source electrode of the PMOS switching tube (Q1) is connected with the positive electrode (PV +) of the photovoltaic cell module, the drain electrode of the PMOS switching tube is connected with the positive electrode of the diode (D1), and the grid electrode of the PMOS switching tube is connected with the overcharge protection unit;
the overcharge protection unit comprises a first resistor (R1) and a second resistor (R2) which are connected in series, a third resistor (R3) and a first triode (Q3) which are connected in series, a fourth resistor (R4) and a second triode (Q5); the 1 end of the first resistor (R1) is connected with the positive electrode (PV +) of the photovoltaic cell assembly, the 1 end of the third resistor (R3) and the source electrode of the PMOS switching tube (Q1), and the 2 end of the first resistor (R1) is connected with the 1 end of the second resistor (R2), the base electrode of the first triode (Q3) and the collector electrode of the second triode (Q5); the 2 end of the third resistor (R3) is connected with the collector of the first triode (Q3) and the grid of the PMOS switching tube (Q1); the emitter of the first triode (Q3) is connected with the 2 end of the second resistor (R2), the emitter of the second triode (Q5) and the negative electrode (PV-) of the photovoltaic cell assembly; the 1 end of the fourth resistor (R4) is connected with a single chip Microcomputer Control Unit (MCU), and the 2 end is connected with the base electrode of a second triode (Q5); the resistance value of the first resistor (R1) is smaller than that of the second resistor (R2);
the cathode of the diode (D1) is respectively connected with the storage battery and the battery voltage detection unit;
and the single chip Microcomputer Control Unit (MCU) is connected with the battery voltage detection unit.
2. The photovoltaic charging circuit of claim 1, wherein: the resistance value of the second resistor (R2) is at least five times the resistance value of the first resistor (R1).
3. The photovoltaic charging circuit of claim 2, wherein: the battery voltage detection unit includes a fifth resistor (R5) and a sixth resistor (R6); the 1 end of the fifth resistor (R5) is respectively connected with the cathode of the diode (D1) and the anode of the storage battery, and the 2 end of the fifth resistor (R5) is respectively connected with the 1 end of the sixth resistor (R6) and the single chip Microcomputer Control Unit (MCU); and the 2 end of the sixth resistor (R6) is respectively connected with the negative electrode of the storage battery, the emitter of the first triode (Q3), the emitter of the second triode (Q5) and the negative electrode (PV-) of the photovoltaic cell module.
4. The photovoltaic charging circuit of claim 3, wherein: the resistance value of the fifth resistor (R5) is larger than that of the sixth resistor (R6).
5. The photovoltaic charging circuit of claim 3, wherein: and a DC/DC converter is also arranged between the cathode of the diode (D1) and the single chip Microcomputer Control Unit (MCU).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520858706.1U CN205070581U (en) | 2015-10-30 | 2015-10-30 | Photovoltaic charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520858706.1U CN205070581U (en) | 2015-10-30 | 2015-10-30 | Photovoltaic charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205070581U true CN205070581U (en) | 2016-03-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520858706.1U Expired - Fee Related CN205070581U (en) | 2015-10-30 | 2015-10-30 | Photovoltaic charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205070581U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026277A (en) * | 2016-07-01 | 2016-10-12 | 北京云迹科技有限公司 | Controllable battery charging circuit and charger |
| CN106130100A (en) * | 2016-07-01 | 2016-11-16 | 北京云迹科技有限公司 | Controlled battery charger and charger |
-
2015
- 2015-10-30 CN CN201520858706.1U patent/CN205070581U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026277A (en) * | 2016-07-01 | 2016-10-12 | 北京云迹科技有限公司 | Controllable battery charging circuit and charger |
| CN106130100A (en) * | 2016-07-01 | 2016-11-16 | 北京云迹科技有限公司 | Controlled battery charger and charger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215300 Suzhou high tech Zone, Jiangsu, Lu Shan Road, No. 199 Co-patentee after: CANADIAN SOLAR MANUFACTURING (CHANGSHU) Inc. Patentee after: CSI SOLAR POWER GROUP Co.,Ltd. Address before: 215300 Suzhou high tech Zone, Jiangsu, Lu Shan Road, No. 199 Co-patentee before: CANADIAN SOLAR MANUFACTURING (CHANGSHU) Inc. Patentee before: CSI SOLAR POWER (CHINA) Inc. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP03 | Change of name, title or address |
Address after: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee after: Atlas sunshine Power Group Co.,Ltd. Patentee after: CANADIAN SOLAR MANUFACTURING (CHANGSHU) Inc. Address before: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee before: CSI SOLAR POWER GROUP Co.,Ltd. Patentee before: CANADIAN SOLAR MANUFACTURING (CHANGSHU) Inc. |
|
| CP03 | Change of name, title or address | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 |