CN112398214A - Rechargeable solar external power supply device and electric energy meter power supply system - Google Patents
Rechargeable solar external power supply device and electric energy meter power supply system Download PDFInfo
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- CN112398214A CN112398214A CN202011166490.4A CN202011166490A CN112398214A CN 112398214 A CN112398214 A CN 112398214A CN 202011166490 A CN202011166490 A CN 202011166490A CN 112398214 A CN112398214 A CN 112398214A
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- 239000003990 capacitor Substances 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000005286 illumination Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 13
- 229910052782 aluminium Inorganic materials 0.000 description 13
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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
Abstract
The invention provides a rechargeable solar external power supply device and an electric energy meter power supply system, wherein the device comprises a photovoltaic array, and the photovoltaic array is connected with a storage battery through a DC/DC conversion module and is used for charging the storage battery; the positive output end of the storage battery is connected with the input end of an inverter through a control switching circuit, and the output end of the inverter is used for being connected to a load; the control switching circuit is used for controlling a storage battery switched to the device to supply power through the conversion of the inverter when the voltage of a main power supply of a load is detected to be insufficient or power-off; the control module is connected with the DC/DC conversion module; and the control module is used for comparing the received detected voltage current value with a preset reference value and outputting a control signal to the DC/DC conversion module so as to control and regulate the output of the DC/DC conversion module. The automatic charging is completed under the illumination condition, the charging protection function and the automatic switching function are achieved, the size is small, and the installation is convenient and fast.
Description
Technical Field
The invention relates to the technical field of power supply design of electric energy meters, in particular to a rechargeable solar external power supply device and an electric energy meter power supply system.
Background
With the rapid development of economy in China, the demand of various industries on electricity is increasingly greater, and the phenomenon of unbalanced electricity consumption at different times is increasingly serious. In order to relieve the increasingly sharp power supply and demand contradiction in China, adjust load curves, improve the phenomenon of unbalanced power consumption, comprehensively implement a peak, flat and valley time-sharing power price system, "load shifting" to improve the national power utilization efficiency and reasonably utilize power resources, a part of domestic provincial and municipal power departments have started to gradually provide multi-rate electric energy meters to charge the power consumption of users in a time-sharing manner.
When the electric energy meter is connected to a circuit to be tested, alternating currents flow through the current coil and the voltage coil, and the alternating currents respectively generate alternating magnetic fluxes in iron cores of the alternating currents and the voltage coil; the alternating magnetic flux passes through the aluminum plate, and eddy current is induced in the aluminum plate; the eddy currents are acted upon by a force in the magnetic field, so that the aluminum disk is rotated by a torque (main torque). The greater the power consumed by the load, the greater the current through the current coil, and the greater the eddy currents induced in the aluminum disk, the greater the torque that causes the aluminum disk to rotate. I.e. the magnitude of the torque is proportional to the power consumed by the load. The higher the power, the higher the torque and the faster the aluminum disc rotates. When the aluminum disc rotates, the aluminum disc is acted by the braking torque generated by the permanent magnet, and the direction of the braking torque is opposite to that of the active torque; the magnitude of the braking torque is in direct proportion to the rotating speed of the aluminum disc, and the faster the aluminum disc rotates, the larger the braking torque is. When the main torque and the braking torque reach temporary balance, the aluminum disc rotates at a constant speed. The power consumed by the load is proportional to the number of revolutions of the aluminum disk. When the aluminum disc rotates, the counter is driven to indicate the consumed electric energy. This is a simple process of operation of the electric energy meter.
The electric energy meter can normally measure under the normal condition of the power supply, and when the main line is powered off, the electric energy meter loses the power supply, is powered off immediately, loses the measuring function and affects the measuring accuracy.
Disclosure of Invention
The invention provides a rechargeable solar external power supply device and an electric energy meter power supply system.
The technical scheme of the invention is as follows:
in a first aspect, the technical scheme of the invention provides a rechargeable solar external power supply device, which comprises a photovoltaic array, wherein the photovoltaic array is connected with a storage battery through a DC/DC conversion module and is used for charging the storage battery;
the positive output end of the storage battery is connected with the input end of an inverter through a control switching circuit, and the output end of the inverter is used for being connected to a load;
the control switching circuit is used for controlling a storage battery switched to the device to supply power through the conversion of the inverter when the voltage of a main power supply of a load is detected to be insufficient or power-off;
the output end of the photovoltaic array is also connected with a first detection module, the first detection module is connected with a control module, and the control module is connected with the DC/DC conversion module;
the first detection module is used for detecting the voltage and current value output by the photovoltaic array and inputting the detection result into the control module;
and the control module is used for comparing the received detected voltage current value with a preset reference value and outputting a control signal to the DC/DC conversion module so as to control and regulate the output of the DC/DC conversion module.
The DC/DC conversion module works by converting a continuous direct current voltage into another (fixed or adjustable) direct current voltage through adjusting a control switch, and plays a role of follow current.
And the control module is used for calculating and comparing the acquired current and voltage, and then regulating the duty ratio d of pwm through an mppt algorithm to control and regulate the output of the DC/DC conversion module, so that the photovoltaic array works at the maximum power point, the optimal charging current and voltage are provided for the storage battery, and the storage battery is charged quickly, stably and efficiently. And the loss of the storage battery is reduced in the charging process, the service life of the storage battery is prolonged as much as possible, and the storage battery is protected from the harm of over-charge and over-discharge.
The device can be used as a standby power supply, can be automatically put into use after the main power supply is powered off, and compared with other external power supplies, the device can finish automatic charging under the illumination condition, has the functions of charging protection and automatic switching, and is small in size and convenient and fast to install.
Preferably, the control switching circuit comprises a second detection module, a MOS transistor Q1 and a MOS transistor Q2;
the positive output end of the storage battery is connected with the source electrode of the MOS transistor Q2, the drain electrode of the MOS transistor Q2 is connected with the source electrode of the MOS transistor Q1, and the drain electrode of the MOS transistor Q1 is connected with the input end of the inverter; the gate of the MOS transistor Q1 is connected to the second detection module through a resistor R12, the gate of the MOS transistor Q1 is connected to the gate of the MOS transistor Q2, and the gate of the MOS transistor Q2 is also grounded through a resistor R11;
the positive output of the battery is connected to ground through capacitor C1.
When the second detection module detects and outputs a high level, the main power supply supplies power normally at the moment, the MOS tube Q1 is controlled to be cut off, when the main power supply is powered off or abnormal, the second detection module outputs a low level, the low level signal enables the MOS tube Q1 to be conducted, the MOS tube Q2 is conducted accordingly, and the storage battery supplies power to the load through the inverter. When the main power supply is restored, the second detection module outputs high level, the MOS tube Q1 is cut off, the storage battery stops supplying power, and the electric quantity stored by the capacitor C1 can play a role of follow current to a certain extent.
Preferably, the DC/DC conversion module is connected to the secondary battery through a charge protection circuit.
Preferably, the charge protection circuit includes a transistor Q3, a transistor Q4, and a transistor Q5;
an emitter of the transistor Q3 is connected to an output end of the DC/DC conversion module, a base of the transistor Q3 is connected to a collector of the transistor Q4 through a first LED lamp and a resistor R2 which are sequentially connected in series, a base of the transistor Q4 is connected to a collector of the transistor Q5, a base of the transistor Q5 is connected to a collector of the transistor Q4 through a capacitor C2 and a resistor R7 which are connected in series, a base of the transistor Q4 is further connected to a collector of the transistor Q3 through a resistor R8, a collector of the transistor Q3 is connected to a charging interface of the battery, a collector of the transistor Q3 is further connected to an anode of a diode D2 through a resistor R6, a cathode of the diode D2 is connected to a base of the transistor Q5, a base of the transistor Q5 is grounded through a resistor R5 and a resistor R5 which are connected in series, and a connection point of the resistor R5 is connected to a connection point; the output of the DC/DC conversion module is also connected to ground through a second LED lamp and a resistor R1 connected in series.
The photovoltaic array charges the storage battery through the charging protection circuit, a charging indicator light LED1 is bright in the charging process, a triode Q4 is conducted, a triode Q3 is conducted, the output voltage is increased, at the moment, C2 in the circuit has a positive feedback function, a triode Q4 and a triode Q3 are conducted, a triode Q5 is cut off, the charging circuit reaches a stable state at the moment, the storage battery is close to be fully charged, a diode D1 is conducted through a resistor R6 output by the DC/DC conversion module, a triode Q5 is further conducted, at the moment, a triode Q4 and a triode Q3 are cut off, the charging circuit is cut off, the current output by the DC/DC conversion module enables an indicator light LED2 to be bright through the indicator light LED2, and charging is finished.
Preferably, the positive output end of the storage battery is also connected with the voltage conversion regulating circuit through a switch;
the output end of the voltage conversion regulating circuit is connected with the control module and used for supplying power to the control module.
Preferably, the voltage conversion regulating circuit comprises a power supply chip, an output end of the power supply chip is connected with a current detection resistor through an inductor, two ends of the current detection resistor are respectively connected to the operational amplifier, and an output end of the operational amplifier is connected with a feedback end of the power supply chip through a regulating unit; the connection point of the current detection resistor and the inverting input end of the operational amplifier is used as the output end of the voltage conversion regulating circuit.
The voltage conversion regulating circuit is used for adjusting the voltage according to whether the output current exceeds the light and heavy load current threshold of the power supply chip. The specific current detection resistor detects output current, the detected current is processed by the operational amplifier, a control signal is output in real time, the work of the adjusting unit is controlled, the adjustment is carried out according to the actual light and heavy load voltage change value of the power supply chip, the light and heavy load voltage value of the output voltage is kept the same, and the output voltage precision is improved.
Preferably, the device further comprises a housing and a main board, wherein the main board is arranged in the housing;
the DC/DC conversion module, the control module, the inverter, the first detection module and the control switching circuit are arranged on the mainboard;
the storage battery is arranged in the shell;
the shell is provided with an input interface and an output interface;
one end of the input interface is connected with the output end of the photovoltaic array outside the shell, and the other end of the input interface is connected with the DC/DC conversion module on the mainboard;
the output interface is connected with the output end of the inverter on the mainboard and is used for being connected to an external load.
Preferably, the shell is also provided with a display screen and an LED lamp hole;
the display screen is connected with the control module; the device is used for displaying the voltage and current values detected by the first detection module and the set reference value;
a first LED lamp and a second LED lamp on the charging protection circuit respectively indicate light emission to the outside of the shell through LED lamp holes;
the switch is arranged on the shell.
Preferably, the housing comprises a main body and a handle;
one end of the handle is rotatably connected with the first side wall of the main body; the other end is rotationally connected with the second side wall;
the handle is respectively connected to the first side wall and the second side wall in a rotating mode through a pin shaft;
the handle is a handle with an inverted door frame shape. Is convenient to use.
In a second aspect, the present invention further provides a power supply system for an electric energy meter, including a main power supply and an external power supply device; the electric energy meter is respectively connected with the main power supply and the external power supply device;
the main power supply is connected with a second detection module through an AC/DC conversion module, the second detection module is connected with a control switching circuit and is used for controlling to be switched to an external power supply device to supply power to the electric energy meter when the main power supply is detected to be powered off;
the external power supply device is the rechargeable solar external power supply device of the first aspect;
the electric energy meter is used as a load of the rechargeable solar external power supply device and is connected with the output end of the inverter;
a control interface is arranged on the shell;
when the control switching circuit comprises the second detection module, one end of the control interface is connected with the AC/DC conversion module outside the shell, and the other end of the control interface is connected with the second detection module.
According to the technical scheme, the invention has the following advantages: the device can be used as a standby power supply of the electric energy meter, and can be automatically put into use after the main power supply is powered off.
The device is used as a standby power supply of the electric energy meter, the function of converting the electric energy meter into the standby power supply for uninterrupted metering after power failure under special conditions is realized, metering blind areas are avoided, uninterrupted metering in all periods is realized, the automatic charging function of the standby power supply is realized through the solar panel, and the effect of uninterrupted metering of the electric energy meter can be achieved even if the power failure time exceeds 1 day.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic connection diagram of an apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic connection diagram of a charge protection circuit according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a housing according to an embodiment of the present invention.
Fig. 4 is a schematic connection diagram of a system of one embodiment of the present invention.
101-shell, 102-handle, 103-input interface, 104-control interface, 105-output interface, 106-switch, 107-display screen, 108-pin shaft, LED 1-first LED lamp, LED 2-second LED lamp.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the technical solution of the present invention provides a rechargeable solar external power supply device, which includes a photovoltaic array, wherein the photovoltaic array is connected to a storage battery through a DC/DC conversion module, and is used for charging the storage battery;
the positive output end of the storage battery is connected with the input end of an inverter through a control switching circuit, and the output end of the inverter is used for being connected to a load;
the control switching circuit is used for controlling a storage battery switched to the device to supply power through the conversion of the inverter when the voltage of a main power supply of a load is detected to be insufficient or power-off;
the output end of the photovoltaic array is also connected with a first detection module, the first detection module is connected with a control module, and the control module is connected with the DC/DC conversion module;
the first detection module is used for detecting the voltage and current value output by the photovoltaic array and inputting the detection result into the control module;
and the control module is used for comparing the received detected voltage current value with a preset reference value and outputting a control signal to the DC/DC conversion module so as to control and regulate the output of the DC/DC conversion module.
The DC/DC conversion module works by converting a continuous direct current voltage into another (fixed or adjustable) direct current voltage through adjusting a control switch, and plays a role of follow current.
And the control module is used for calculating and comparing the acquired current and voltage, and then regulating the duty ratio d of pwm through an mppt algorithm to control and regulate the output of the DC/DC conversion module, so that the photovoltaic array works at the maximum power point, the optimal charging current and voltage are provided for the storage battery, and the storage battery is charged quickly, stably and efficiently. And the loss of the storage battery is reduced in the charging process, the service life of the storage battery is prolonged as much as possible, and the storage battery is protected from the harm of over-charge and over-discharge.
Those skilled in the art know that the DC/DC conversion module can be divided into many kinds, from the viewpoint of the operation mode, the DC/DC conversion module can be divided into: step-up, step-down, step-up and step-down, and Cocko. The buck converter (buckconverter) is a single-tube non-isolated dc converter with an output voltage equal to or less than an input voltage; the main architecture of buck-boost converter is composed of pwm controller and a transformer or two independent inductors, which can generate stable output voltage. When the input voltage is higher than the target voltage, the conversion circuit reduces the voltage; when the input voltage is reduced to be lower than the target voltage, the system can adjust the working period to enable the conversion circuit to perform boosting action; the boost converter (boost converter) is a single-tube non-isolated dc converter with an output voltage higher than an input voltage, and the used power electronic devices and elements are the same as the buck converter, and the difference between the boost converter and the buck converter is only that the circuit topology is different. In this embodiment, the DC/DC conversion module employs a buck-boost converter.
The device can be used as a standby power supply, can be automatically put into use after the main power supply is powered off, and compared with other external power supplies, the device can finish automatic charging under the illumination condition, has the functions of charging protection and automatic switching, and is small in size and convenient and fast to install.
In some embodiments, the control switching circuit includes a second detection module, a MOS transistor Q1, and a MOS transistor Q2;
the positive output end of the storage battery is connected with the source electrode of the MOS transistor Q2, the drain electrode of the MOS transistor Q2 is connected with the source electrode of the MOS transistor Q1, and the drain electrode of the MOS transistor Q1 is connected with the input end of the inverter; the gate of the MOS transistor Q1 is connected to the second detection module through a resistor R12, the gate of the MOS transistor Q1 is connected to the gate of the MOS transistor Q2, and the gate of the MOS transistor Q2 is also grounded through a resistor R11;
the positive output of the battery is connected to ground through capacitor C1.
When the second detection module detects and outputs a high level, the main power supply supplies power normally at the moment, the MOS tube Q1 is controlled to be cut off, when the main power supply is powered off or abnormal, the second detection module outputs a low level, the low level signal enables the MOS tube Q1 to be conducted, the MOS tube Q2 is conducted accordingly, and the storage battery supplies power to the load through the inverter. When the main power supply is restored, the second detection module outputs high level, the MOS tube Q1 is cut off, the storage battery stops supplying power, and the electric quantity stored by the capacitor C1 can play a role of follow current to a certain extent.
In some embodiments, the DC/DC conversion module is coupled to the battery through a charge protection circuit, as shown in fig. 2. Specifically, the charging protection circuit comprises a triode Q3, a triode Q4 and a triode Q5; (ii) a
An emitter of the transistor Q3 is connected to an output end of the DC/DC conversion module, a base of the transistor Q3 is connected to a collector of the transistor Q4 through a first LED lamp and a resistor R2 which are sequentially connected in series, a base of the transistor Q4 is connected to a collector of the transistor Q5, a base of the transistor Q5 is connected to a collector of the transistor Q4 through a capacitor C2 and a resistor R7 which are connected in series, a base of the transistor Q4 is further connected to a collector of the transistor Q3 through a resistor R8, a collector of the transistor Q3 is connected to a charging interface of the battery, a collector of the transistor Q3 is further connected to an anode of a diode D2 through a resistor R6, a cathode of the diode D2 is connected to a base of the transistor Q5, a base of the transistor Q5 is grounded through a resistor R5 and a resistor R5 which are connected in series, and a connection point of the resistor R5 is connected to a connection point; the output of the DC/DC conversion module is also connected to ground through a second LED lamp and a resistor R1 connected in series.
The photovoltaic array charges the storage battery through the charging protection circuit, a charging indicator light LED1 is bright in the charging process, a triode Q4 is conducted, a triode Q3 is conducted, the output voltage is increased, at the moment, C2 in the circuit has a positive feedback function, a triode Q4 and a triode Q3 are conducted, a triode Q5 is cut off, the charging circuit reaches a stable state at the moment, the storage battery is close to be fully charged, a diode D1 is conducted through a resistor R6 output by the DC/DC conversion module, a triode Q5 is further conducted, at the moment, a triode Q4 and a triode Q3 are cut off, the charging circuit is cut off, the current output by the DC/DC conversion module enables an indicator light LED2 to be bright through the indicator light LED2, and charging is finished.
In some embodiments, the positive output of the battery is also connected to the voltage conversion regulation circuit through a switch 106; the output end of the voltage conversion regulating circuit is connected with the control module and used for supplying power to the control module. The voltage conversion regulating circuit comprises a power supply chip, wherein the output end of the power supply chip is connected with a current detection resistor through an inductor, two ends of the current detection resistor are respectively connected to an operational amplifier, and the output end of the operational amplifier is connected with the feedback end of the power supply chip through a regulating unit; the connection point of the current detection resistor and the inverting input end of the operational amplifier is used as the output end of the voltage conversion regulating circuit.
The voltage conversion regulating circuit is used for adjusting the voltage according to whether the output current exceeds the light and heavy load current threshold of the power supply chip. The specific current detection resistor detects output current, the detected current is processed by the operational amplifier, a control signal is output in real time, the work of the adjusting unit is controlled, the adjustment is carried out according to the actual light and heavy load voltage change value of the power supply chip, the light and heavy load voltage value of the output voltage is kept the same, and the output voltage precision is improved.
As shown in FIG. 3, in some embodiments, the device further comprises a housing 101 and a main board disposed within the housing 101;
the DC/DC conversion module, the control module, the inverter, the first detection module and the control switching circuit are arranged on the mainboard;
the storage battery is arranged in the shell 101;
the shell 101 is provided with an input interface 103 and an output interface 105;
one end of the input interface 103 is connected with the output end of the photovoltaic array outside the shell 101, and the other end of the input interface 103 is connected with the DC/DC conversion module on the mainboard;
the output interface 105 is connected to the output terminal of the inverter on the main board, and the output interface 105 is used for connecting to an external load.
In some embodiments, the housing 101 is further provided with a display screen 107 and an LED lamp hole;
the display screen 107 is connected with the control module; the device is used for displaying the voltage and current values detected by the first detection module and the set reference value;
the first LED lamp LED1 and the second LED lamp LED2 on the charging protection circuit respectively emit light to the outside of the shell 101 through LED lamp holes;
the switch 106 is disposed on the housing 101.
In some embodiments, the housing 101 includes a main body and a handle 102;
one end of the handle 102 is rotatably connected with the first side wall of the main body; the other end is rotatably connected with the second side wall of the main body;
the handle 102 is rotatably connected to the first side wall and the second side wall of the main body by a pin 108, respectively;
handle 102 is an "inverted doorframe" type handle. Is convenient to use.
As shown in fig. 4, an embodiment of the present invention further provides an electric energy meter power supply system, which includes a main power source and an external power source device;
the electric energy meter is respectively connected with the main power supply and the external power supply device;
the main power supply is connected with a second detection module through an AC/DC conversion module, the second detection module is connected with a control switching circuit and is used for controlling to be switched to an external power supply device to supply power to the electric energy meter when the main power supply is detected to be powered off;
the external power supply device is the rechargeable solar external power supply device in the embodiment;
the electric energy meter is used as a load of the rechargeable solar external power supply device and is connected with the output end of the inverter;
the shell is provided with a control interface 104;
when the control switching circuit includes the second detection module, one end of the control interface 104 is connected to the AC/DC conversion module outside the housing 101, and the other end of the control interface 104 is connected to the second detection module.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A rechargeable solar external power supply device is characterized by comprising a photovoltaic array, wherein the photovoltaic array is connected with a storage battery through a DC/DC conversion module and is used for charging the storage battery;
the positive output end of the storage battery is connected with the input end of an inverter through a control switching circuit, and the output end of the inverter is used for being connected to a load;
the control switching circuit is used for controlling a storage battery switched to the device to supply power through the conversion of the inverter when the voltage of a main power supply of a load is detected to be insufficient or power-off;
the output end of the photovoltaic array is also connected with a first detection module, the first detection module is connected with a control module, and the control module is connected with the DC/DC conversion module;
the first detection module is used for detecting the voltage and current value output by the photovoltaic array and inputting the detection result into the control module;
and the control module is used for comparing the received detected voltage current value with a preset reference value and outputting a control signal to the DC/DC conversion module so as to control and regulate the output of the DC/DC conversion module.
2. The rechargeable solar external power supply device as claimed in claim 1, wherein the control switching circuit comprises a second detection module, a MOS transistor Q1 and a MOS transistor Q2;
the positive output end of the storage battery is connected with the source electrode of the MOS transistor Q2, the drain electrode of the MOS transistor Q2 is connected with the source electrode of the MOS transistor Q1, and the drain electrode of the MOS transistor Q1 is connected with the input end of the inverter; the gate of the MOS transistor Q1 is connected to the second detection module through a resistor R12, the gate of the MOS transistor Q1 is connected to the gate of the MOS transistor Q2, and the gate of the MOS transistor Q2 is also grounded through a resistor R11;
the positive output of the battery is connected to ground through capacitor C1.
3. The rechargeable solar external power supply device according to claim 1, wherein the DC/DC conversion module is connected to the storage battery through a charge protection circuit.
4. The rechargeable solar external power supply device according to claim 3, wherein the charge protection circuit comprises a transistor Q3, a transistor Q4 and a transistor Q5;
an emitter of the transistor Q3 is connected to an output end of the DC/DC conversion module, a base of the transistor Q3 is connected to a collector of the transistor Q4 through a first LED lamp and a resistor R2 which are sequentially connected in series, a base of the transistor Q4 is connected to a collector of the transistor Q5, a base of the transistor Q5 is connected to a collector of the transistor Q4 through a capacitor C2 and a resistor R7 which are connected in series, a base of the transistor Q4 is further connected to a collector of the transistor Q3 through a resistor R8, a collector of the transistor Q3 is connected to a charging interface of the battery, a collector of the transistor Q3 is further connected to an anode of a diode D2 through a resistor R6, a cathode of the diode D2 is connected to a base of the transistor Q5, a base of the transistor Q5 is grounded through a resistor R5 and a resistor R5 which are connected in series, and a connection point of the resistor R5 is connected to a connection point; the output of the DC/DC conversion module is also connected to ground through a second LED lamp and a resistor R1 connected in series.
5. The rechargeable solar external power supply device according to claim 3, wherein the positive output end of the storage battery is further connected with the voltage conversion regulating circuit through a switch;
the output end of the voltage conversion regulating circuit is connected with the control module and used for supplying power to the control module.
6. The rechargeable solar external power supply device according to claim 5, wherein the voltage conversion and regulation circuit comprises a power supply chip, an output end of the power supply chip is connected with a current detection resistor through an inductor, two ends of the current detection resistor are respectively connected to the operational amplifier, and an output end of the operational amplifier is connected with a feedback end of the power supply chip through a regulation unit; the connection point of the current detection resistor and the inverting input end of the operational amplifier is used as the output end of the voltage conversion regulating circuit.
7. The rechargeable solar external power supply device according to claim 6, further comprising a housing and a main board, wherein the main board is disposed in the housing;
the DC/DC conversion module, the control module, the inverter, the first detection module and the control switching circuit are arranged on the mainboard;
the storage battery is arranged in the shell;
the shell is provided with an input interface and an output interface;
one end of the input interface is connected with the output end of the photovoltaic array outside the shell, and the other end of the input interface is connected with the DC/DC conversion module on the mainboard;
the output interface is connected with the output end of the inverter on the mainboard and is used for being connected to an external load.
8. The rechargeable solar external power supply device according to claim 7, wherein the housing is further provided with a display screen and an LED lamp hole;
the display screen is connected with the control module; the device is used for displaying the voltage and current values detected by the first detection module and the set reference value;
a first LED lamp and a second LED lamp on the charging protection circuit respectively indicate light emission to the outside of the shell through LED lamp holes;
the switch is arranged on the shell.
9. The rechargeable solar external power supply device according to claim 7, wherein the housing comprises a main body and a handle;
one end of the handle is rotatably connected with the first side wall of the main body; the other end is rotationally connected with the second side wall;
the handle is respectively connected to the first side wall and the second side wall in a rotating mode through a pin shaft;
the handle is a handle with an inverted door frame shape.
10. A power supply system of an electric energy meter is characterized by comprising a main power supply and an external power supply device; the electric energy meter is respectively connected with the main power supply and the external power supply device;
the main power supply is connected with a second detection module through an AC/DC conversion module, the second detection module is connected with a control switching circuit and is used for controlling to be switched to an external power supply device to supply power to the electric energy meter when the main power supply is detected to be powered off;
the external power supply device is the rechargeable solar external power supply device as defined in any one of claims 1-9;
the electric energy meter is used as a load of the rechargeable solar external power supply device and is connected with the output end of the inverter;
a control interface is arranged on the shell;
when the control switching circuit comprises the second detection module, one end of the control interface is connected with the AC/DC conversion module outside the shell, and the other end of the control interface is connected with the second detection module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011166490.4A CN112398214A (en) | 2020-10-27 | 2020-10-27 | Rechargeable solar external power supply device and electric energy meter power supply system |
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| CN202011166490.4A CN112398214A (en) | 2020-10-27 | 2020-10-27 | Rechargeable solar external power supply device and electric energy meter power supply system |
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| CN112398214A true CN112398214A (en) | 2021-02-23 |
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| CN202011166490.4A Pending CN112398214A (en) | 2020-10-27 | 2020-10-27 | Rechargeable solar external power supply device and electric energy meter power supply system |
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