CN2676559Y - Semiconductor LED solar energy street lamp control circuit - Google Patents

Abstract

The utility model relates to a semiconductor light-emitting diode solar street lamp control circuit, which consists of a microprocessor circuit (1), a stabilized power supply circuit (2), a real-time clock circuit (3), a liquid crystal display circuit (4), and a charging switch circuit ( 5), discharge switch circuit (6), keyboard interface circuit (7), solar cell and accumulator interface circuit (8); it has the charging and discharging device of microprocessor, has real-time clock circuit, and control output has PWM (pulse width Modulation) output, high charging efficiency; through the real-time timing circuit, it is set to perform full charge and full discharge maintenance activation operation once every 6 months for the battery that has been discharged for a long time, to eliminate the memory effect and prolong the service life of the battery. It can be widely used in lighting systems composed of solar photovoltaics and LEDs, and urban LED lighting decoration projects.

Description

Semiconductor light-emitting diode solar street lamp control circuit

Technical field

The utility model relates to a semiconductor light-emitting diode solar street lamp controller circuit.

Background

It is uneconomical and not environmentally friendly to use solar photovoltaic power generation to supply power to traditional lamps and lanterns. One is: the power consumption of traditional lamps is relatively large, and they all work under high voltage (such as: 110V, 220V, 380V or even higher), which is extremely unsafe to use; when using solar power for power supply, a step-up inverter link must be added, so that Reduced the utilization rate of energy again (good inverter efficiency is about 90%, general inverter is about 70%-80%, poor is just lower). The second is: traditional light sources such as energy-saving lamps have relatively high luminous efficiency, but their lifespan is very short (it will be broken in 3-5 months, and the good ones can be close to one year). Even gas discharge lamps only have 3,000-10,000 hours. The third is: the solar cell produces direct current, and an inverter must be provided; the conversion efficiency of the solar cell is not too high (about 14% for general civilian products), and the generated electric energy is limited, which cannot meet the long-term needs of high-power loads; if The cost of simply increasing the area of solar cells is too high, which is not conducive to the promotion of solar energy products.

With the development of solid-state physics and semiconductor lighting technology, humans have developed the fourth-generation light source—solid-state light-emitting diode LED (the first generation is an incandescent lamp, the second generation is a fluorescent lamp, and the third generation is a gas discharge lamp). LED has the advantages of energy saving (15% less electricity than energy-saving lamps), no pollution, long life (100,000 hours), high luminous efficiency, frequency control, maintenance-free, and no pollution. According to the forecast of the International Commission on Illumination, by 2010 The penetration rate of the fourth-generation light source used as lighting in 2010 is 100% in Japan, 50% in the United States, and 15% in my country. With the continuous improvement of the production process of semiconductor light-emitting diodes, high-brightness blue LEDs have been developed, which excite phosphors to generate white light through blue LEDs, making it possible for LEDs to replace traditional lighting. At present, LEDs have begun to be used as lighting abroad, and they are mainly used for decoration in China. Due to its broad development prospects, my country's Ministry of Science and Technology also launched a semiconductor lighting plan in June 2003.

Using solar energy to power the LED lighting system not only has high energy efficiency, but also does not pollute the environment. Because the solar cell directly converts light into direct current, and the working current of the LED itself is also direct current, which can reduce the loss of intermediate links (such as: inverter, etc.). At the same time, the LED power consumption is low, the brightness is high, and there is no pollution to the environment even after being damaged. Therefore, the street lighting system composed of solar photovoltaic and LED is a highly efficient lighting energy-saving and environmental protection system. The system consists of solar cell components, a light source integrated with multiple super-brightness semiconductor light-emitting diodes (LEDs), street lamp poles, lamp holders, street lamp charge and discharge controllers, maintenance-free lead-acid batteries, and control boxes.

In order to improve the efficiency and life of the street lighting system, the street lamp charge and discharge controller is very important. In particular, the matching efficiency of the system composed of solar cells and LED light sources, and the service life of the energy storage device-battery. LEDs have frequency response characteristics, which can realize PWM control to adjust power output and improve system energy utilization efficiency; lead-acid batteries have a short service life and have memory effects. Monitoring the charging and discharging process and doing regular maintenance can prolong their service life. The essential. Therefore, it is very necessary to develop a solar LED street lamp controller that is applied to a street lamp lighting system that combines solar power generation and LED. The existing charging and discharging controllers for solar street lamps cannot regulate the output power arbitrarily, cannot perform regular maintenance on lead-acid batteries, and eliminate memory effects to prolong the service life.

content of the invention

The purpose of this utility model is to overcome the shortcomings of the existing street lamp charge and discharge controllers that cannot arbitrarily regulate the output power and perform regular maintenance on the lead-acid battery, eliminate the memory effect to prolong the service life, and provide a LED application that increases the frequency and pulse width. Control (PWM) and power regulation functions, and at the same time maintain the battery regularly through the real-time clock, and have a semiconductor light-emitting diode solar street light controller circuit that prolongs the service life of the battery.

The purpose of this utility model is achieved in that;

It consists of a microprocessor circuit (1), a regulated power supply circuit (2), a real-time clock circuit (3), a liquid crystal display circuit (4), a charge switch circuit (5), a discharge switch circuit (6), and a keyboard interface circuit ( 7), the solar cell and the storage battery interface circuit (8); the microprocessor circuit (1) realizes the connection with other functional circuits through its input and output P0, P1 I/O ports, and its A/D input port realizes the connection of the storage battery , solar cell sampling measurement, the regulated power supply circuit (2) provides 5V voltage to the microprocessor circuit (1) and other circuits by stabilizing the 12V DC voltage to a 5V power supply: the liquid crystal display circuit (4) passes the nibble data The bus (4 lines) and the control bus (3 lines) are connected with the P0 and P1 ports of the microprocessor (the liquid crystal display circuit has an independent controller, and its working power is provided by the power supply circuit); the real-time clock circuit (3) passes The serial bus SCL, SDA is connected with the P1 port of the microprocessor to realize the reading and writing function; the charge switch circuit (5) is connected with the P1 port of the microprocessor by a control line, and the control signal is output by the software analog waveform; the discharge switch circuit (6) A control line is also connected with the P1 port of the microprocessor, and the control signal is output by the software analog waveform to control the switch action; the keyboard interface circuit (7) and the microprocessor circuit are connected through two I/O ports Line P0 is connected; the solar cell and storage battery interface circuit (8) is connected with the +12V terminal in the charging switch circuit (5) through a fuse and a switch, and is connected with the +12V terminal in the discharge switch circuit (6).

The advantages and positive effects of the utility model are that the street lamp controller is a charging and discharging device with a microprocessor with low power consumption. With a real-time clock circuit, the control output has a PWM (pulse width modulation) output. Through the real-time timing circuit, it is set to perform a full charge and full discharge maintenance activation operation every 6 months for the battery that has been shallowly discharged for a long time, to eliminate the memory effect and prolong the service life of the battery. Practice has proved that the service life of the battery can be extended by about 50% through maintenance and activation. The clock circuit can also provide time output to control the time of street lamps. The charge and discharge control output of the controller provides PWM (pulse width modulation) function to directly control the MOSFET switch tube to achieve maximum power tracking (MPPT), which greatly improves the charging efficiency, especially the LED light source can be adjusted under PWM output control (Because LED can work normally at high frequency and low frequency; but ordinary lamps such as fluorescent lamps do not have it, and changing the frequency has a significant impact on the life of the lamp). For example: the controller outputs full power from dark to 12 o'clock in the evening, and can properly reduce the brightness of the LED light source after 12 o'clock in the dead of night, which can improve energy utilization efficiency and prolong the energy use time, reducing energy consumption. Small system configuration reduces system cost. The controller can be widely used in lighting systems composed of solar photovoltaics and LEDs, and urban LED lighting decoration projects. The modified system software can also be applied to lighting systems composed of conventional mains electricity and LEDs. It has the outstanding advantages of energy saving, environmental protection and high efficiency. .

Illustration

Fig. 1 is a block diagram of the utility model

Figure 2 is a schematic diagram of the circuit

specific implementation

Below in conjunction with accompanying drawing and embodiment further illustrate the utility model, but the utility model does not constitute limitation.

The semiconductor light-emitting diode solar street lamp control circuit shown in Figure 1 and Figure 2 consists of a microprocessor circuit (1), a regulated power supply circuit (2), a real-time clock circuit (3), a liquid crystal display circuit (4), and a charging switch circuit ( 5), discharge switch circuit (6), keyboard interface circuit (7), solar cell and accumulator interface circuit (8); In the microprocessor circuit (1), the microprocessor is the core of the controller, and the microprocessor circuit ( 1) The connection with other functional circuits is realized through its input and output P0 and P1 I/O ports, and its A/D input port realizes sampling and measurement of batteries and solar cells; the 7805 chip in the regulated power supply (2) connects the battery The 12V DC voltage provided is regulated to 5V to supply power to P15-VDD of the microprocessor and other circuits; the serial ports SCL and SDA of the real-time clock chip are connected to P1.3 and P1.4 of the microprocessor to realize reading and writing Function; liquid crystal display circuit (4) is connected with the P0.0, P0.1, P0.2, P0.3 ports of the microprocessor through the nibble data bus DB4-DB7, and the read and write control lines E, R/W , RS, are connected with P1.0, P1.1, P1.7 of the microprocessor, and these 7 lines are connected in parallel with a 10K pull-up resistor (resistance exclusion); the charging switch circuit (5) connects with the control terminal VOK The P1.6 of the microprocessor circuit is connected; the discharge switch circuit (6) is connected with the P1.2 of the microprocessor circuit through the control terminal TIME/VOLTAGE; the input terminals K1, K2 of the keyboard interface circuit (7) are connected with the microprocessor circuit P0.6 and P0.6 are connected, and are connected with pull-up resistors in parallel; the solar cell component interface CN3-2 of the solar cell and storage battery interface circuit (8) is connected with the storage battery interface CN2-1 through a safety tube and an anti-reverse charge diode, The negative end of the anti-reverse charging diode is connected to the 12V end of the voltage stabilizing power supply (2), the charging switch circuit (5) and the discharge switch circuit (6) through the switch SW1.

In the described microprocessor (CPU) circuit (1), microprocessor is produced by the 20PIN of compact structure with compact structure 51 series single-chip microcomputers (P87LPC767) of low power consumption that carry A/D conversion function and watchdog function , Peripheral crystal oscillator (XT), capacitors C1, C2, C3, sampling resistors R2, R3, R4, R5, electrolytic capacitors C8, C9; the microprocessor is the core of the controller, and its relationship with other functional circuits depends on The input and output (I/O) port of the microprocessor is realized. The PIN6 and PIN7 ports are connected to the 6MHZ crystal oscillator XT. The microprocessor chip PIN16 and PIN17 pass two pairs of four precision sampling resistors R2, R3, R4, R5 And electrolytic capacitors C8, C9 are directly connected to the chip A/D input port after sampling to realize the measurement function.

Described voltage-stabilizing power supply circuit (2) is made up of three-terminal voltage-stabilizing source LM7805 and C5, C6 electric capacity; Mainly is microprocessor (CPU) circuit (1), real-time clock circuit (3), liquid crystal display circuit (4) , a charging switch circuit (5), a discharging switch circuit (6), a keyboard interface circuit (7) and the like provide power and a reference voltage. The interconnection relationship is as follows: the 7805 chip stabilizes the 12V DC voltage provided by the battery to 5V to supply power to the P15-VDD of the microprocessor P87LPC767 and to the VCC-5V power supply of other circuits; the input and output terminals of the 7805 chip are parallel Capacitors C5 and C6 connected to ground GND.

Described real-time clock circuit (3) has the PCF8583 chip that independently provides real-time clock (as: year, month, day, hour, minute, second) produced by PHLIPS company, its peripheral circuit crystal oscillator (XT1), electric capacity C14, C15 , button lithium battery, and diode D3; the real-time clock is obtained through CPU control to read and write, and provides a clock reference for the control output. The interconnection relationship is as follows: PIN1 and PIN2 of the PCF8583 clock chip are connected to a standard clock crystal oscillator, capacitors C14 and C15 are connected to both ends of the crystal oscillator XT1 in parallel, and a backup power supply 3.6V lithium battery is connected between VCC and the lithium battery through a one-way diode IN4148.

Described liquid crystal display circuit (4) is made up of liquid crystal module MCC162 and the resistance exclusion PR1A of 10K * 7; This liquid crystal module is a single-line dot matrix character liquid crystal, provides man-machine interface for controlling competition setting, clock adjustment; Half of the liquid crystal module The byte data bus DB4-DB7 and the read-write control lines E, R/W, and RS are all connected in parallel with a 10K pull-up resistor-exhaust resistor, chip power supply VCC and VCC of the regulated power supply circuit (2) connected.

Described charging switch circuit (5) is made up of NPN type MOSFET power switch tube 5N06, triode T1, T3, resistance R15, R16, R17, R19 and electric capacity C11, light-emitting diode L1, protection diode D2; Its function is to be made up of by microprocessor The controller outputs the control signal (adjustable frequency pulse width PWM) through the PIN3 of the CPU to realize the three-step charging control of the solar battery to the storage battery. L1 acts as a charge status indicator. The interconnection relationship is as follows: the grid of the 50N06 gate control terminal is connected in series with the collector terminal of the PNP transistor T1 and the resistor R1; at the same time, the grid of the gate control terminal is connected in parallel with the resistor R17 and the capacitor C11 of the negative pole of the solar battery; T1 The emitter is connected to the 12V power supply, the base is controlled by the control signal VOK through the collector connection of T3, the collector is also connected to the 12V power supply through R15, and the emitter is connected to the ground; in addition, the light-emitting diode L1 and R17 are connected in series to the ground, The positive end is connected to the collector of T1, which acts as a charge status indicator. Here, the charging switch circuit (5) is connected to P1.6 of the microprocessor circuit through the control terminal VOK, the output terminal of the switch tube 50N06 is connected to the negative terminal of the solar cell assembly, and the input terminal is connected to the negative terminal of the storage battery.

Described discharge switch circuit (6) is very similar to charging circuit, by NPN type MOSFET power switch tube 5N06, transistor T2, T4, resistance R7, R8, R9, R10, R18 and capacitor C12, light-emitting diode L2, protection diode D4 Composition; its interconnection relationship is as follows: 50N06 gate control terminal gate is connected with the collector terminal of PNP transistor T4 and resistor R10 series. At the same time, the grid of the gate control terminal is connected in parallel with a resistor R9 and a capacitor C12 to the negative electrode of the solar cell. The emitter of T4 is connected to the 12V power supply, the base is controlled by the control signal Time/Voltage/Day/Night through the collector connection of T2, the collector is also connected to the 12V power supply through R8, and the emitter is connected to the ground. In addition, the light-emitting diode L2 and R18 are connected to the ground in series, and the positive terminal is connected to the collector of T4, which acts as a discharge indicator. Its function is to realize the output control of the battery to the load by the microprocessor through the Pin10 of the CPU to output the combined control signal of time, light control and battery voltage (that is, the adjustable frequency pulse width PWM to realize load power regulation). L2 acts as a discharge status indicator. Here the discharge switch circuit (6) is connected with the P1.2 of the microprocessor circuit through the control terminal Time/Voltage/Day/Night, the output terminal of the switch tube 50N06 is connected with the negative terminal of the storage battery, and the input terminal is connected with the load of the socket CN1 (lamp ) connected to the negative terminal block.

The keyboard interface circuit (7) is composed of pull-up resistors R11, R12 and interface CN4. The circuit is connected with an external membrane keyboard to realize button operation. The membrane keyboard adopts a 2×1 matrix button operation, and the output ports of the two buttons pass through Two pull-up resistors R11 and R12 are connected in parallel to the interface CN4, and the common end of the button is grounded through the interface CN4. The output ports of the two buttons are connected in series with the P0.6 and P0.7 ports of the microprocessor through the interface CN4.

Described solar cell, accumulator interface circuit (8) is made up of switch SW1, fuse F1, anti-reverse charge diode D1; In series, the positive pole of the anti-reverse charge diode is connected to the positive terminal block of the solar cell module. The fuse F1 can protect the battery during high current charging and discharging (such as positive and negative reverse connection, or short circuit), and the negative pole of the battery is connected to the negative pole. The seat is connected in series with the output terminal of the charging switch 5n06.

The circuit (working) process is as follows:

After the wiring of each part of the system is connected, turn on the controller switch. At this time, the controller is powered on and the microprocessor enters the initialization state. After 5 seconds, the controller starts to work normally, and the display (4) shows the battery voltage. At this time, the microprocessor continuously detects the battery voltage, and when the battery is full, the green indicator light is on, and the charging switch (5) is closed; when the battery is insufficient, the red indicator light is on, and the charging switch (5) is turned on. When the set voltage is close to the upper limit charging voltage, the transfer frequency is 300HZ and the duty cycle is 1/2 drip charging. When the storage battery is lower than the lower limit voltage, the charging switch is fully opened, and the display (4) also displays the charging and discharging status in real time. Simultaneously, the microprocessor (1) is also used for timing and ambient brightness detection. When the time to turn on the lights is set and the weather is not dark (the degree of darkness can be adjusted according to the usage requirements), the discharge switch (6) will not be turned on, otherwise , the switch does not turn on when the time is not up and the ambient brightness is dark; only when the ambient brightness is very low and the set time is satisfied at the same time, the discharge switch is turned on.

In addition, through the real-time clock circuit, when the microprocessor detects that the full power output is between 6:00 p.m. , reducing the brightness to save energy, while reducing system costs and extending the lighting time. The microprocessor also detects the date and time. When the date is on July 1st or December 20th of each year, perform a full-charge and full-discharge maintenance operation on the battery to remove the memory effect of the lead-acid battery and prolong the service life of the battery. purpose (can be extended by 50%). So these functions are carried out under the real-time monitoring of the microprocessor.

Claims (9)

1. semiconductor light-emitting-diode solar streetlight control circuit is characterized in that it is made up of microcontroller circuit (1), voltage-stabilized power supply circuit (2), real time clock circuit (3), liquid crystal display circuit (4), charge switch circuit (5), discharge switching circuit (6), keyboard interface circuit (7), solar cell and storage battery interface circuit (8); Microcontroller circuit (1) by its input and output P0, P1 I/O cause for gossip existing with being connected of other each functional circuits, its A/D input port realizes that to storage battery, solar array voltage sampled measurements voltage-stabilized power supply circuit (2) provides 5V voltage by giving microcontroller circuit (1) and other circuit with the voltage stabilizing of 12V direct voltage for the 5V power supply; Liquid crystal display circuit (4) is connected with P0, the P1 mouth of microprocessor by the data/address bus and the control bus of nibble; Real time clock circuit (3) is connected with the P1 mouth of microprocessor by universal serial bus SCL, SDA realizes the clock read-write capability; Charge switch circuit (5) is connected with one of microprocessor P1 mouth line by a control line, realizes the output of PWM waveform by the microprocessor simulation, the control switch action; Discharge switching circuit (6) also is connected with one of microprocessor P1 mouth line by a control line, realizes the output of PWM waveform by the microprocessor simulation, the control switch action; Be connected by two I/O mouth lines between keyboard interface circuit (7) and the microcontroller circuit; Solar cell and storage battery interface circuit (8) by in protective tube and switch and the charge switch circuit (5)+the 12V end is connected, with in the discharge switching circuit (6)+12V holds and is connected.

2. according to the solar streetlight control circuit described in the claim 1, it is characterized in that in the microcontroller circuit (1) that low-power consumption 51 series monolithic P87LPC7XX, ceramic disc capacitor C1, the C2 of peripheral crystal oscillator XT, 15p, filter capacitor C3, accurate sample resistance R2, R3, R4, R5, electrochemical capacitor C8, C9 that the 20Pin with cramped construction that microprocessor is produced by PHLIPS company carries A/D translation function and watchdog function form; Its interconnected relationship is: Pin6, Pin7 near and meet crystal oscillator XT, simultaneously C1, C2 and crystal oscillator XT near and connect, C3 connects near Pin15; Sample resistance R2, the R3 ground connection of connecting, the R4 ground connection of connecting with R5, the CN3-2 solar cell positive pole in another termination solar cell of R2 and the storage battery interface circuit (8), the switch SW 1 in another termination solar cell of R4 and the storage battery interface circuit (8)+the 12V end; R2 is connected with the A/D input port Pin17 of microprocessor with the mid point lead-out wire that is connected of R3; R4 is connected the realization sampling with the mid point lead-out wire that is connected of R5 with the A/D input port Pin16 of microprocessor.

3. according to the solar streetlight control circuit described in the claim 1, it is characterized in that voltage-stabilized power supply circuit (2) is made up of three-terminal voltage-stabilizing source LM7805 and C5, C6 electric capacity; 7805 chips and solar cell and storage battery interface circuit (8)+12V output connects and composes voltage input end, connects direct-to-ground capacitance C5; 7805 output also meets direct-to-ground capacitance C6, draws the VCC+5V power supply.

4. according to the solar streetlight control circuit described in the claim 1, it is characterized in that real time clock circuit (3) independently provides the PCF8583 of real-time clock chip, its peripheral circuit crystal oscillator XT1, capacitor C 14, C15, lithium coin cells, diode D3 to form by having of PHLIPS company production; Its interconnected relationship is as follows: the Pin1 of PCF8583 clock chip, Pin2 are connected to the standard time clock crystal oscillator, and capacitor C 14, C15 are attempted by crystal oscillator XT1 two ends, are connected with stand-by power supply 3.6V lithium battery by unilateral diode IN4148 between VCC and lithium battery.

5. according to the solar streetlight control circuit described in the claim 1, it is characterized in that liquid crystal display circuit (4) is made up of the exclusion PR1A of Liquid Crystal Module MCC162 and 10K * 7; This Liquid Crystal Module is a single file dot character liquid crystal, provides man-machine interface for the control race-entry is set, the clock adjustment shows; The data/address bus DB4-DB7 of the nibble of Liquid Crystal Module and read-write control line E, R/W, these 7 lines of RS all and connect the resistance-exclusion of drawing high of 10K, chip power VCC is connected with the VCC of voltage-stabilized power supply circuit (2).

6. according to the solar streetlight control circuit described in the claim 1, it is characterized in that charge switch circuit (5) by NPN type MOSFET power switch pipe 5NO6, triode T1, T3, resistance R 15, R16, R17, R19 and capacitor C 11, light-emitting diode L1, protection diode D2 forms; Its interconnected relationship is as follows: 50NO6 gate terminals grid is connected with resistance R 1 by the collector terminal of positive-negative-positive triode T1 and is attached thereto; Gate terminals grid and be connected to resistance R 17 and capacitor C 11 simultaneously to the solar cell negative pole; The emitter of T1 is connected with the 12V power supply, and its base stage is connected by the collector electrode of control signal VOK by T3 and controls, and collector electrode also links to each other with the 12V power supply by R15, and emitter links to each other with ground; In addition, the light-emitting diode L1 ground connection of connecting with R16, positive terminal links to each other with the collector electrode of T1.

7. according to the solar streetlight control circuit described in the claim 1, it is characterized in that discharge switching circuit (6) by NPN type MOSFET power switch pipe 5NO6, triode T2, T4, resistance R 7, R8, R9, R10, R18 and capacitor C 12, light-emitting diode L2, protection diode D4 forms; Its interconnected relationship is as follows: 50NO6 gate terminals grid is attached thereto by collector terminal and resistance R 10 strings of positive-negative-positive triode T4 again; Gate terminals grid and be connected to resistance R 9 and capacitor C 12 simultaneously to the solar cell negative pole; The emitter of T4 is connected with the 12V power supply, and its base stage is connected by the collector electrode of control signal Time/Voltage/Day/Night by T2 and controls, and collector electrode also links to each other with the 12V power supply by R8, and emitter links to each other with ground; In addition, the light-emitting diode L2 ground connection of connecting with R18, positive terminal links to each other with the collector electrode of T4, plays the discharge condition indicative function.

8. according to the solar streetlight control circuit described in the claim 1, it is characterized in that keyboard interface circuit (7) forms by drawing high resistance R 11, R12 and interface CN4, this circuit is connected with outside membrane keyboard realizes button operation, membrane keyboard adopts the button operation of 2 * 1 matrixes, the delivery outlet of two buttons by interface CN4 parallel connection two draw high resistance R 11, R12, the common port of button is by interface CN4 ground connection.

9. according to each solar streetlight control circuit described in the claim 1-8, it is characterized in that solar cell and storage battery interface circuit (8) fill diode D1 by socket CN2, CN3, switch SW 1, protective tube F1, counnter attack and form; Its interconnected relationship is as follows: the anodal CN2-1 of storage battery is by filling diode cathode and connect with protective tube F1, switch SW 1, counnter attack, the positive pole that diode is filled in counnter attack is connected with the anodal CN3-2 junction block of solar module, and the negative pole CN2-2 of storage battery is connected by the switch mosfet pipe Q1 in the charge switch circuit (5) with solar module negative pole CN3-1 junction block.

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