WO2019136879A1 - Mppt controller and power supply system provided with controller - Google Patents

Abstract

The MPPT controller comprises: a BUCK-BOOST circuit with an input end and an output end respectively connected to an output end of a target photovoltaic array and an input end of a target energy storage battery; an input voltage and current collection circuit and an output voltage and current collection circuit respectively configured to collect in real time the voltage and current of the input and output ends of the BUCK-BOOST circuit; a battery voltage detection circuit and a battery temperature detection circuit respectively configured to collect the voltage and temperature of the target energy storage battery; and a logic control integrated circuit configured to control, according to the input voltage and current, the output voltage and current, and the battery voltage and temperature that are acquired by the collection circuit, the BUCK-BOOST circuit to track the maximum power point to charge the target energy storage battery.

Description

MPPT controller and power supply system provided with the same

This application claims priority to Chinese Patent Application No. 201810036043.3, entitled "Solar UAV MPPT Controller and Power Supply System with the Controller", which was filed on January 15, 2018, the Chinese Patent Office. The entire contents are incorporated herein by reference.

Technical field

The present disclosure relates to the field of solar energy application technologies, and more particularly to an MPPT controller and a power supply system provided with the same.

Background technique

The Maximum Power Point Tracking (MPPT) solar controller is a device that converts the energy of a solar panel into a load of energy with maximum efficiency. The MPPT controller can detect the generated voltage of the solar panel in real time and track the highest voltage and current values, so that the solar cell system can charge the battery with the maximum power output.

Under normal circumstances, the MPPT controller tracks the highest voltage and current values output by the solar array battery through software according to different ambient temperature and illumination intensity, and outputs the maximum power point voltage to adjust the output of the photovoltaic array (ie, solar array battery). The power allows the PV array to always output the maximum power, and the output control terminal of the PV array is output at the maximum power point voltage.

Summary of the invention

In an aspect of the disclosure, the disclosure provides an MPPT controller, including:

a BUCK-BOOST circuit, an input end of the BUCK-BOOST circuit is connected to an output end of the target photovoltaic array, an output end of the BUCK-BOOST circuit is connected to an input end of the target energy storage battery, and the BUCK-BOOST circuit is configured as an input The voltage and current are transformed;

An input voltage current collecting circuit is connected to the input end of the BUCK-BOOST circuit, an output end of the input voltage current collecting circuit is connected to a corresponding port of the logic control integrated circuit, and the input voltage current is collected The circuit is configured to acquire an input voltage and an input current of the BUCK-BOOST circuit in real time;

An output voltage current collecting circuit connected to an output end of the BUCK-BOOST circuit and configured to acquire an output voltage and an output current of the BUCK-BOOST circuit in real time, the output voltage current collecting circuit The output is connected to a corresponding port of the logic control integrated circuit;

a battery voltage detecting circuit, wherein an input end of the battery voltage detecting circuit is connected to a voltage output end of the target energy storage battery, an output end of the battery voltage detecting circuit is connected to the logic control integrated circuit, and configured to collect the real-time The voltage of the target energy storage battery;

a battery temperature detecting circuit, wherein an input end of the battery temperature detecting circuit is connected to a heat generating unit of the target energy storage battery, an output end of the battery temperature detecting circuit is connected to the logic control integrated circuit, and configured to collect the target in real time The operating temperature of the energy storage battery;

a logic control integrated circuit configured to perform internal output data according to the input voltage current collecting circuit, the output voltage current collecting circuit, the battery voltage detecting circuit, and the battery temperature detecting circuit The combination of the op amp circuit and the logic circuit obtains a control signal for the MOS transistor in the BUCK-BOOST circuit, and the control signal is used to adjust the output voltage and the output current of the BUCK-BOOST circuit.

Wherein, the BUCK-BOOST circuit comprises a chopper inductor and a plurality of MOS tubes.

Wherein, the logic control integrated circuit adopts an LT8490 integrated chip; an input pin of the input current amplifier of the LT8490 integrated chip is connected to an output current end of the input voltage current collecting circuit, and an input voltage feedback pin of the LT8490 integrated chip Connecting an output voltage terminal of the input voltage current collecting circuit, an input analog-to-digital conversion pin and an input PWM voltage adjusting pin of the LT8490 integrated chip are respectively connected to corresponding ports of the input voltage current collecting circuit to implement an input analog signal Conversion to the input digital signal and adjustment of the input PWM voltage;

An input pin of the output current amplifier of the LT8490 integrated chip is connected to an output current end of the output voltage current collecting circuit, and an output voltage feedback pin of the LT8490 integrated chip is connected to an output voltage end of the output voltage current collecting circuit. The output analog-to-digital conversion pin and the output PWM voltage adjustment pin of the LT8490 integrated chip are respectively connected to corresponding ports of the output voltage current collecting circuit, so as to realize conversion of an output analog signal to an output digital signal and adjustment of an output PWM voltage;

a battery voltage input pin of the LT8490 integrated chip is connected to an output voltage end of the battery voltage detecting circuit, and a temperature detecting pin of the LT8490 integrated chip is connected to an output temperature end of the battery temperature detecting circuit, the LT8490 integrated chip The drive control output pin is connected to the gate control terminal of the corresponding MOS transistor of the BUCK-BOOST circuit.

The input voltage current collecting circuit comprises: an input voltage current collecting resistor R56, an input measuring filter capacitor C84, a first input measuring resistor R24, a second input measuring resistor R68, a third input measuring resistor R66, and a fourth input measuring resistor. R55, a fifth input measuring resistor R54, a sixth input measuring resistor R63, a first input measuring capacitor C90 and a second input measuring capacitor C66; wherein

The input voltage current collecting resistor R56 is connected in parallel with the input measuring filter capacitor C84 to form a first parallel circuit, and the first end of the first parallel circuit is connected to the output end of the target photovoltaic array, the first parallel a second end of the circuit is coupled to an input of the BUCK-BOOST circuit; a first end of the first parallel circuit is coupled to an input current amplifier forward input pin CSPIN of the LT8490 integrated chip, and passes the first input The measuring capacitor C90 is grounded, and after the second end of the first parallel circuit is connected in series with the first input measuring resistor R24, the input current amplifier inverting input pin CSNIN of the LT8490 integrated chip is connected; the first parallel circuit After the first end serially connects the second input measuring resistor R68 and the third input measuring resistor R66, the input analog-to-digital conversion pin FBIR of the LT8490 integrated chip is connected, and the second input measuring resistor R68 and The connection midpoint of the third input measuring resistor R66 is connected to the input voltage feedback pin FBIN of the LT8490 integrated chip, and is grounded through the fifth input measuring resistor R54; After the connection midpoint of the two input measuring resistor R68 and the third input measuring resistor R66 is sequentially connected in series with the fourth input measuring resistor R55 and the sixth input measuring resistor R63, the input PWM voltage of the LT8490 integrated chip is connected. The pin FBIW is adjusted, and the connection midpoint of the fourth input measuring resistor R55 and the sixth input measuring resistor R63 is grounded through the second input measuring capacitor C66.

The output voltage current collecting circuit comprises: an output voltage current collecting resistor R57, an output measuring filter capacitor C83, a first output measuring resistor R23, a second output measuring resistor R13, a third output measuring resistor R16, and a fourth output measuring resistor. R71, a fifth output measuring resistor R73, a first output measuring capacitor C87 and a second output measuring capacitor C68.

The output voltage current collecting resistor R57 is connected in parallel with the input measuring filter capacitor C83 to form a second parallel circuit, and the first end of the second parallel circuit is connected to the output end of the BUCK-BOOST circuit, and the second parallel a second end of the circuit is coupled to the input end of the target energy storage battery;

The first end of the second parallel circuit is connected to the output current amplifier forward input pin CSPOUT of the LT8490 integrated chip, and is grounded through the first output measuring capacitor C87, and the second end string of the second parallel circuit After the first output measuring resistor R23 is connected, the output current amplifier reverse input pin CSNOUT of the LT8490 integrated chip is connected;

The second end of the second parallel circuit is connected in series to the second output measuring resistor R13, the fourth output measuring resistor R71 and the fifth output measuring resistor R73, and is connected to the output of the LT8490 integrated chip. The PWM voltage adjustment pin FBOW, the connection midpoint of the second output measurement resistor R13 and the fourth output measurement resistor R71 are respectively connected to the output voltage feedback pin FBOUT and the output analog-digital conversion pin of the LT8490 integrated chip FBOR is grounded through the third output measuring resistor R16, and a connection midpoint of the fourth output measuring resistor R71 and the fifth output measuring resistor R73 is grounded through the second output measuring capacitor C68.

The battery temperature detecting circuit includes a temperature sensor, a temperature measuring resistor R94, and a temperature measuring capacitor C74. The temperature collecting end of the temperature sensor is connected to the heat generating unit of the target energy storage battery, and the temperature output end of the temperature sensor is connected to the temperature detecting pin TEMPSENSE of the LT8490 integrated chip, and passes through the temperature measuring resistor R94 and the The temperature measuring capacitors C74 are respectively grounded, and the power input terminal of the temperature sensor is connected to the DC voltage output terminal VDD of the LT8490 integrated chip.

The BUCK-BOOST circuit includes: a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a fourth MOS transistor M4, and a chopper inductor L1; the first MOS transistor M1 is sequentially and said The chopper inductor L1 and the fourth MOS transistor M4 are connected in series, and the first MOS transistor M1, the chopper inductor L1 and the fourth MOS transistor M4 connected in series are connected at an output end of the target photovoltaic array and Between the input ends of the target energy storage battery, the gate control end of the first MOS transistor M1 is connected to the first upper MOS driving pin TG1 of the LT8490 integrated chip, and the gate of the fourth MOS transistor M4 The control terminal is connected to the second upper MOS driving pin TG2 of the LT8490 integrated chip; the first end of the second MOS transistor M2 is connected to the connection midpoint of the first MOS transistor M1 and the chopper inductor L1. The second end of the second MOS transistor M2 is grounded, the gate control end of the second MOS transistor M2 is connected to the first lower MOS driving pin BG1 of the LT8490 integrated chip; the first of the third MOS transistor M3 The terminal is connected to the connection midpoint of the chopper inductor L1 and the fourth MOS transistor M4, the second end of the third MOS transistor M3 is grounded, and the gate control end of the third MOS transistor M3 LT8490 integrated chip connected to said second lower drive pin MOS BG2.

The BUCK-BOOST circuit further includes: a first standby MOS transistor M1-1 connected in parallel with the first MOS transistor M1, a second standby MOS transistor M2-1 connected in parallel with the second MOS transistor M2, and a third MOS a third standby MOS transistor M3-1 connected in parallel with the tube M3 and a fourth standby MOS transistor M4-1 connected in parallel with the fourth MOS transistor M4, wherein

The first standby MOS transistor M1-1 and the first MOS transistor M1 are mutually standby, and the second standby MOS transistor M2-1 and the second MOS transistor M2 are mutually standby, and the third standby MOS The tube M3-1 and the third MOS tube M3 are mutually standby, and the fourth standby MOS tube M4-1 and the fourth MOS tube M4 are mutually reserved.

The output voltage feedback pin FBOUT of the LT8490 integrated chip simultaneously serves as the battery voltage input pin, and the connection midpoint of the second output measurement resistor R13 and the fourth output measurement resistor R71 simultaneously serves as the battery The output voltage terminal of the voltage detection circuit.

The MPPT controller further includes a chopper inductor current detecting circuit, and the chopper inductor current detecting circuit includes a chopper current collecting resistor R44, a first chopping current measuring resistor R8, and a second chopping current measuring resistor R9, a chopping current measuring capacitor C12, a second chopping current measuring capacitor C14 and a third chopping current measuring capacitor C15; the first end of the chopping current collecting resistor R44 is connected to the second MOS transistor M2 and the first a second end of the third MOS transistor M3, and connected to the chopping current forward input pin CSP of the LT8490 integrated chip by the first chopping current measuring resistor R8, the second end of the chopping current collecting resistor R44 Grounded, and connected to the chopping current inverting input pin CSN of the LT8490 integrated chip through the second chopping current measuring resistor R9; the chopping current forward input pin CSP passes the second chopping current The measuring capacitor C14 is grounded, the chopping current inverting input pin CSN is grounded through the third chopping current measuring capacitor C15, and the chopping current is forward input pin CSP and the chopping current is reverse input Pinning between pins CSN A chopping current measurement capacitor C1.

The MPPT controller is a solar drone MPPT controller.

In another aspect, the present disclosure provides a power supply system including: a target photovoltaic array, a target energy storage battery, and an MPPT controller as described above; an output end of the target photovoltaic array is coupled to an input end of the MPPT controller, The output end of the MPPT controller is connected to the input end of the target energy storage battery, and the output end of the target energy storage battery is connected to the power input end of the target load.

Wherein, the power supply system is a solar drone power supply system, and the target load is the solar drone load.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the disclosure, and are intended to be a In the drawing:

1 is a schematic structural diagram of an MPPT controller according to some embodiments of the present disclosure;

FIG. 2 is a schematic diagram of partial functional pins employed in an LT8490 integrated chip according to some embodiments of the present disclosure; FIG.

3 is a schematic structural diagram of an input voltage current collecting circuit according to some embodiments of the present disclosure;

4 is a schematic structural diagram of an output voltage current collecting circuit according to some embodiments of the present disclosure;

FIG. 5 is a schematic structural diagram of a battery temperature detecting circuit according to some embodiments of the present disclosure; FIG.

6 is a schematic structural diagram of a BUCK-BOOST circuit according to some embodiments of the present disclosure;

7 is a schematic structural diagram of a chopper inductor current detecting circuit according to some embodiments of the present disclosure;

FIG. 8 is a schematic structural diagram of a power supply system according to some embodiments of the present disclosure.

Detailed ways

The technical solutions in the present disclosure will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.

It is apparent that the described embodiments are part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

As an aspect of the embodiment of the present disclosure, the present embodiment provides an MPPT controller, as shown in FIG. 1, including: an input voltage current collecting circuit 1, an output voltage current collecting circuit 2, a battery voltage detecting circuit 3, and a battery temperature detecting. Circuit 4, logic control integrated circuit 5 and BUCK-BOOST circuit 6.

The input and output of the BUCK-BOOST circuit 6 are connected to the output of the target photovoltaic array 7 and the input of the target energy storage battery 8, respectively. The BUCK-BOOST circuit 6 includes a chopper inductor and a plurality of MOS transistors. The BUCK-BOOST circuit 6 converts the input voltage and current.

The input voltage current collecting circuit 1 is connected to the input end of the BUCK-BOOST circuit 6 for real-time acquisition of the input voltage and input current of the BUCK-BOOST circuit 6. The output voltage current collecting circuit 2 is connected to the output end of the BUCK-BOOST circuit 6 for real-time acquisition of the output voltage and output current of the BUCK-BOOST circuit 6. The output terminals of the input voltage current collecting circuit 1 and the output voltage current collecting circuit 2 are respectively connected to corresponding ports of the logic control integrated circuit 5.

The input end and the output end of the battery voltage detecting circuit 3 are respectively connected to the voltage output end of the target energy storage battery 8 and the logic control integrated circuit 5 for collecting the voltage of the target energy storage battery 8 in real time. The input end and the output end of the battery temperature detecting circuit 4 are respectively connected to the heat generating unit of the target energy storage battery 8 and the logic control integrated circuit 5 for collecting the operating temperature of the target energy storage battery 8 in real time. The logic control integrated circuit 5 obtains the output data of the input voltage current collecting circuit 1, the output voltage current collecting circuit 2, the battery voltage detecting circuit 3, and the battery temperature detecting circuit 4 by a combination of the internal operational amplifier circuit and the logic circuit. The control signal of the MOS transistor in the BUCK-BOOST circuit 6 is used to adjust the output voltage and output current of the BUCK-BOOST circuit 6. The MPPT controller of this embodiment adopts the above-mentioned connection structure, and realizes conversion of the output electric energy of the target photovoltaic array 7 to the charging electric energy of the target energy storage battery 8 by using the BUCK-BOOST circuit 6. Specifically, the logic control integrated circuit 5 is used as a control center, and external measurement and control circuits are built by using the function pins of the logic control integrated circuit 5.

When the MPPT controller is running, the input voltage current collecting circuit 1 connected to the input end of the BUCK-BOOST circuit 6 collects the input terminal voltage and the input current of the BUCK-BOOST circuit 6 in real time, that is, the output voltage and output current of the target photovoltaic array 7. And input the collected data to the logic control integrated circuit 5.

The battery voltage detecting circuit 3 detects the voltage across the target energy storage battery 8 in real time, and the battery temperature detecting circuit 4 detects the operating temperature of the target energy storage battery 8 in real time, and respectively uses the detection result as a power conversion circuit (ie, BUCK-BOOST circuit 6). The control target is input to the logic control integrated circuit 5. The output voltage current collecting circuit 2 connected to the output of the BUCK-BOOST circuit 6 collects the output voltage and output current of the BUCK-BOOST circuit 6 in real time, and inputs the collected data as a feedback signal of the final output voltage current to the logic control integrated circuit 5 .

The logic control integrated circuit 5 amplifies the small signal voltage converted from the input and output currents input from the corresponding function pins into voltage values that can be recognized by the logic circuit through its internal operational amplifier circuit. At the same time, the logic control integrated circuit 5 outputs the logic for controlling the BUCK-BOOST circuit 6 through the combined transformation of the internal logic circuit according to the magnitude of the input and output voltages, the magnitude of the input and output currents, and the temperature and voltage changes of the target energy storage battery. Signal, and according to the logic signal, adjust the duty ratio of the corresponding MOS tube in the BUCK-BOOST circuit 6, to achieve control of the output voltage and current following the voltage and temperature characteristics of the target energy storage battery 8, and to constant current and constant voltage (Constant-current The constant-voltage, CCCV) control method converts the maximum efficiency of the photovoltaic array into the energy of the energy storage polymer, that is, the target energy storage battery 8 and the load device.

The target energy storage battery 8 of the present embodiment may be an energy storage polymer lithium battery. An MPPT controller, such as a solar drone MPPT controller, can be constructed by hardware circuits and integrated chips with higher integration, which can effectively simplify system design, enhance system stability, and reduce faults. The probability of occurrence. In addition, the output voltage of the MPPT controller can be automatically adjusted according to the working condition of the load, which can effectively reduce power loss and improve transmission efficiency.

An MPPT controller built using hardware and integrated chips is superior to an MPPT control system implemented using software. This is because the control method and system for implementing the MPPT function through the software disturbance analysis algorithm will increase the system design difficulty and increase the failure rate. In addition, the output control terminal of the PV array outputs at the maximum power point voltage. When the output voltage does not match the load voltage, a secondary conversion is required to connect to the load, which increases power loss.

In some embodiments of the present disclosure, the logic control integrated circuit 5 employs an LT8490 integrated chip. The input pin of the input current amplifier in the LT8490 integrated chip is connected to the output current terminal of the input voltage current collecting circuit 1. The input voltage feedback pin of the LT8490 integrated chip is connected to the output voltage terminal of the input voltage current collecting circuit 1. The input analog-to-digital conversion pin and the input PWM voltage adjustment pin of the LT8490 integrated chip are respectively connected to the corresponding ports of the input voltage current collecting circuit 1, thereby realizing the conversion of the input analog signal to the input digital signal and the adjustment of the input PWM voltage.

The input pin of the output current amplifier of the LT8490 integrated chip is connected to the output current terminal of the output voltage current collecting circuit 2. The output voltage feedback pin of the LT8490 integrated chip is connected to the output voltage terminal of the output voltage current collecting circuit 2. The output analog-to-digital conversion pin and the output PWM voltage adjustment pin of the LT8490 integrated chip are respectively connected to the corresponding ports of the output voltage and current acquisition circuit 2, thereby realizing the conversion of the output analog signal to the output digital signal and the adjustment of the output PWM voltage.

The battery voltage input pin of the LT8490 integrated chip is connected to the output voltage terminal of the battery voltage detecting circuit 3. The temperature detecting pin of the LT8490 integrated chip is connected to the output temperature end of the battery temperature detecting circuit 4. And the drive control output pin of the LT8490 integrated chip is connected to the gate control end of the corresponding MOS transistor of the BUCK-BOOST circuit 6.

In some embodiments of the present disclosure, Linear Technology's LT8490 integrated chip is selected as the logic control integrated circuit 5. FIG. 2 is a schematic diagram of partial functional pins used in an LT8490 integrated chip according to an embodiment of the present disclosure. CSNIN and CSPIN represent the inverting input pin and the forward input pin of the input current amplifier, VIN represents the chip power supply voltage input pin, VINR represents the VIN measurement feedback pin, FBIN represents the input voltage feedback pin, and FBIR represents the input modulus. Conversion pin, FBIW indicates the input PWM voltage adjustment pin, and VDD indicates the chip DC voltage output.

CSPOUT and CSNPOUT represent the forward and reverse input pins of the output current amplifier, FBOUT represents the output voltage feedback pin, FBOR represents the output analog-to-digital conversion pin, and FBOW represents the output PWM voltage adjustment pin.

In some embodiments, FBOUT is also used as an input pin for the battery voltage. TEMPSENSE indicates the temperature detection pin of the chip.

TG1 and TG2 respectively represent the first upper MOS driving pin and the second upper MOS driving pin of the chip, and BG1 and BG2 respectively represent the first lower MOS driving pin and the second lower MOS driving pin of the chip, and SW1 and SW2 respectively. The negative poles of the first and second bootstrap capacitors, BOOST1, BOOST2 represent the positive poles of the first and second bootstrap capacitors respectively, and CSP and CSN respectively represent the forward input pins of the chip's chopping current and the opposite To the input pin.

Using the corresponding function pins integrated in the LT8490 integrated chip, the input and output voltage and current are collected by the design of the peripheral circuit of the chip and the MPPT algorithm is applied to realize the maximum conversion of the electric energy. At the same time, the voltage and temperature state of the load target energy storage battery 8 are detected, and the electric energy is safely and quickly stored in the target energy storage battery 8 by the constant current constant voltage (CCCV) control method.

In some embodiments of the present disclosure, referring to FIG. 3, the input voltage current collecting circuit 1 includes: an input voltage current collecting resistor R56, an input measuring filter capacitor C84, a first input measuring resistor R24, a second input measuring resistor R68, The third input measuring resistor R66, the fourth input measuring resistor R55, the fifth input measuring resistor R54, the sixth input measuring resistor R63, the first input measuring capacitor C90 and the second input measuring capacitor C66. The input voltage current collecting resistor R56 is connected in parallel with the input measuring filter capacitor C84 to form a first parallel circuit. The first end of the first parallel circuit is connected to the output end of the target photovoltaic array 7, and the second end of the first parallel circuit is connected to the BUCK-BOOST. The input of circuit 6. The first end of the first parallel circuit is further connected to the input current amplifier forward input pin CSPIN of the LT8490 integrated chip, and is grounded through the first input measuring capacitor C90. The second end of the first parallel circuit is also connected to the input current amplifier inverting input pin CSNIN of the LT8490 integrated chip after being serially connected with the first input measuring resistor R24. The first end of the first parallel circuit is also connected in series with the second input measuring resistor R68 and the third input measuring resistor R66, and is connected to the input analog-to-digital conversion pin FBIR of the LT8490 integrated chip.

The connection point of the second input measuring resistor R68 and the third input measuring resistor R66 is connected to the input voltage feedback pin FBIN of the LT8490 integrated chip, and is grounded through the fifth input measuring resistor R54, which is connected to the second input measuring resistor The point at which R68 and the third input measurement resistor R66 are connected. The connection point of the second input measuring resistor R68 and the third input measuring resistor R66 is sequentially connected in series with the fourth input measuring resistor R55 and the sixth input measuring resistor R63, and then connected to the input PWM voltage adjusting pin FBIW of the LT8490 integrated chip. The connection midpoint of the fourth input measurement resistor R55 and the sixth input measurement resistor R63 is grounded through the second input measurement capacitor C66.

When the controller is running, the output voltage and output current of the target photovoltaic array 7 are collected by adjusting the value of the input voltage current collecting resistor R56, that is, the input voltage and the input current of the BUCK-BOOST circuit 6. When the value of the resistor R56 is as small as the maximum set limit, the magnitude of the input current is measured by collecting the voltage across the resistor R56. When the value of the resistor R56 is large to the minimum set limit, the magnitude of the input voltage is measured by the voltage division of the resistor R56.

FIG. 4 is a schematic structural diagram of an output voltage current collecting circuit according to an embodiment of the present disclosure. In some embodiments of the present disclosure, the output voltage current collecting circuit 2 includes: an output voltage current collecting resistor R57, an output measuring filter capacitor C83, a first output measuring resistor R23, a second output measuring resistor R13, and a third output measuring resistor R16. The fourth output measuring resistor R71, the fifth output measuring resistor R73, the first output measuring capacitor C87 and the second output measuring capacitor C68. The output voltage current collecting resistor R57 is connected in parallel with the input measuring filter capacitor C83 to form a second parallel circuit, the first end of the second parallel circuit is connected to the output end of the BUCK-BOOST circuit 6, and the second end of the second parallel circuit The input end of the target energy storage battery 8 is connected. In addition, the first end of the second parallel circuit is further connected to the output current amplifier forward input pin CSPOUT of the LT8490 integrated chip, and is grounded through the first output measuring capacitor C87. The second end of the second parallel circuit is also connected to the output current amplifier inverting input pin CSNOUT of the LT8490 integrated chip after serially connecting the first output measuring resistor R23. The second end of the second parallel circuit is further connected in series with the second output measuring resistor R13, the fourth output measuring resistor R71 and the fifth output measuring resistor R73, and then connected to the output PWM voltage adjusting pin FBOW of the LT8490 integrated chip.

The connection midpoint of the second output measuring resistor R13 and the fourth output measuring resistor R71 are respectively connected to the output voltage feedback pin FBOUT of the LT8490 integrated chip and the output analog-to-digital conversion pin FBOR, and grounded through the third output measuring resistor R16. The connection midpoint of the fourth output measurement resistor R71 and the fifth output measurement resistor R73 is grounded through the second output measurement capacitor C68.

When the controller is running, the output voltage and input current of the BUCK-BOOST circuit 6 are collected by adjusting the value of the output voltage current collecting resistor R57. When the value of the output voltage current collecting resistor R57 is as small as the second maximum set limit, the magnitude of the output current is measured by collecting the voltage value across the output voltage current collecting resistor R57. When the value of the output voltage current collecting resistor R57 is large to the second minimum set limit, the magnitude of the output voltage is measured by collecting the divided voltage of the output voltage current collecting resistor R57.

FIG. 5 is a schematic structural diagram of a battery temperature detecting circuit according to an embodiment of the present disclosure. In some embodiments of the present disclosure, the battery temperature detecting circuit 4 includes a temperature sensor, a temperature measuring resistor R94, and a temperature measuring capacitor C74. The temperature collecting end of the temperature sensor is connected to the heat generating unit of the target energy storage battery 8, and the temperature output end is connected to the temperature detecting pin TEMPSENSE of the LT8490 integrated chip, and grounded through the temperature measuring resistor R94 and the temperature measuring capacitor C74, respectively. The power supply input of the temperature sensor is connected to the DC voltage output VDD of the LT8490 integrated chip.

In this embodiment, the temperature of the target energy storage battery is measured by a temperature sensor, for example, a thermocouple can be used for temperature measurement. The temperature output signal measured by the thermocouple is input to the temperature detection pin TEMPSENSE of the LT8490 integrated chip, so that the LT8490 integrated chip can analyze the target energy storage battery characteristics accordingly.

FIG. 6 is a schematic structural diagram of a BUCK-BOOST circuit according to an embodiment of the present disclosure. In some embodiments of the present disclosure, the BUCK-BOOST circuit 6 includes a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a fourth MOS transistor M4, and a chopper inductor L1. The first MOS transistor M1 is sequentially connected in series with the chopper inductor L1 and the fourth MOS transistor M4, and the first MOS transistor M1, the chopper inductor L1 and the fourth MOS transistor M4 connected in series are connected to the output end of the target photovoltaic array 7 and the target storage. Can be between the inputs of the battery 8. The gate control terminal of the first MOS transistor M1 is connected to the first upper MOS driving pin TG1 of the LT8490 integrated chip. The gate control terminal of the fourth MOS transistor M4 is connected to the second upper MOS driving pin TG2 of the LT8490 integrated chip.

The first end of the second MOS transistor M2 is connected to the midpoint of the connection of the first MOS transistor M1 and the chopper inductor L1. The second end of the second MOS transistor M2 is grounded, and the gate control end of the second MOS transistor M2 is connected to the first lower MOS driving pin BG1 of the LT8490 integrated chip. The first end of the third MOS transistor M3 is connected to the connection midpoint of the chopper inductor L1 and the fourth MOS transistor M4, the second end of the third MOS transistor M3 is grounded, and the gate control end of the third MOS transistor M3 is connected to the The second lower MOS driver pin BG2 of the LT8490 integrated chip.

The BUCK-BOOST circuit 6 is a power conversion circuit constructed by the above four MOS tubes and one chopper inductor L1. The output voltage and current are adjusted by controlling the switching states of these MOS transistors.

Referring to FIG. 6, in some embodiments of the present disclosure, the BUCK-BOOST circuit 6 may further include: a first standby MOS transistor M1-1 connected in parallel with the first MOS transistor M1, and a second MOS transistor M2 connected in parallel The second standby MOS transistor M2-1, the third standby MOS transistor M3-1 connected in parallel with the third MOS transistor M3, and the fourth standby MOS transistor M4-1 connected in parallel with the fourth MOS transistor M4. The first standby MOS transistor M1-1 and the first MOS transistor M1 are mutually standby, the second standby MOS transistor M2-1 and the second MOS transistor M2 are mutually standby, and the third standby MOS transistor M3-1 and the third MOS transistor M3 The two standby MOS tubes M4-1 and the fourth MOS tube M4 are alternate with each other.

In this embodiment, redundancy control is implemented by setting a spare tube of four MOS tubes in the circuit, which can effectively improve the stability and reliability of the system.

In some embodiments of the present disclosure, the output voltage feedback pin FBOUT of the LT8490 integrated chip simultaneously serves as a battery voltage input pin, and the connection midpoint of the second output measurement resistor R13 and the fourth output measurement resistor R71 simultaneously serves as a battery voltage detecting circuit. 3 output voltage terminal.

The output end of the BUCK-BOOST circuit 6 is connected to the input end of the target energy storage battery 8 to charge the target energy storage battery 8, so the voltage of the target energy storage battery 8 is the same as the output voltage of the BUCK-BOOST circuit 6, and therefore, the output voltage The battery voltage can be collected by the same voltage acquisition circuit.

In some embodiments of the present disclosure, the MPPT controller further includes a chopper inductor current sensing circuit. FIG. 7 is a schematic structural diagram of a chopper inductor current detecting circuit according to an embodiment of the present disclosure. As an example, the MPPT controller further includes a chopper current collecting resistor R44, a first chopping current measuring resistor R8, a second chopping current measuring resistor R9, a first chopping current measuring capacitor C12, and a second chopping wave. The current measuring capacitor C14 and the third chopping current measuring capacitor C15.

The first end of the chopper current collecting resistor R44 is connected to the second end of the second MOS transistor M2 and the third MOS transistor M3, and is connected to the chopping current forward input pin of the LT8490 integrated chip through the first chopping current measuring resistor R8. CSP. The second end of the chopping current collecting resistor R44 is grounded, and is connected to the chopping current inverting input pin CSN of the LT8490 integrated chip through the second chopping current measuring resistor R9.

The chopping current forward input pin CSP is also grounded through the second chopping current measuring capacitor C14, and the chopping current inverting input pin CSN is also grounded through the third chopping current measuring capacitor C15, and the chopping current is positively input. A first chopping current measuring capacitor C1 is connected between the pin CSP and the chopping current inverting input pin CSN.

The embodiment of the present disclosure measures the current flowing through the chopper inductor L1 by the chopper inductor current detecting circuit provided in the controller according to the above embodiment, and can be used for fault diagnosis of the circuit to further improve system reliability.

Illustratively, the MPPT controller 9 described in the above embodiments can be used in a solar drone.

As another aspect of an embodiment of the present disclosure, a power supply system is also provided. For example, referring to FIG. 8, the power supply system includes: a target photovoltaic array 7, a target energy storage battery 8, and any of the MPPT controllers 9 as described in the above embodiments. The output of the target photovoltaic array 7 is connected to the input of the MPPT controller 9, and the output of the MPPT controller 9 is connected to the input of the target energy storage battery 8. The output of the target energy storage battery is connected to a load 10, such as a power input of the target solar drone load 10.

The power supply voltage required for the solar drone's electrical load is a fixed, stable voltage. Currently, the power system of the drone is usually a lithium battery. In the present application, when powering the unmanned aerial vehicle, a power supply system composed of the target photovoltaic array 7, the target energy storage battery 8 and the MPPT controller 9 as described in the above embodiment is used as the power supply. The target energy storage battery 8 therein may be an energy storage polymer lithium battery. When the solar drone power supply system is working, the voltage of the output terminal can be converted into a variable voltage that follows the characteristics of the lithium battery of the drone power system by the MPPT controller 9, and the target energy storage battery 8 is charged, and the target energy storage battery is charged. 8 provides a fixed, stable voltage for the lithium battery.

The target photovoltaic array 7 converts the collected solar energy into electrical energy to charge the target energy storage battery 8. Since the polymer lithium battery is very sensitive to temperature, when the temperature is too high or too low, the lithium battery cannot be charged. Therefore, during the charging process, the MPPT controller 9 needs to detect the real-time temperature and real-time voltage of the lithium battery, and combine the collected input voltage, current, and output voltage and current to output a varying voltage or current to achieve maximum conversion efficiency. When the temperature of the lithium battery is abnormal, the charging operation of the lithium battery is automatically stopped.

In addition, the output of the embodiment adopts the CCCV control mode, and can realize the maximum efficiency of transmitting the photovoltaic array energy to the lithium battery and the load device according to the situation of the output lithium battery and the load device.

A solar powered drone power supply system provided by an embodiment of the present disclosure is completed by a hardware circuit and an integrated chip, and has higher integration degree, which can effectively simplify system design, enhance system stability, and reduce the probability of failure. In addition, the output voltage can be automatically adjusted according to the operation of the load, which can effectively reduce power loss and improve transmission efficiency.

In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

It should be noted that the above embodiments are only used to explain the technical solutions of the present disclosure, and are not limited thereto; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently substituted; and the modifications or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims (13)

1. An MPPT controller comprising:

   a BUCK-BOOST circuit, an input end of the BUCK-BOOST circuit is connected to an output end of the target photovoltaic array, an output end of the BUCK-BOOST circuit is connected to an input end of the target energy storage battery, and the BUCK-BOOST circuit is configured as an input The voltage and current are transformed;

   An input voltage current collecting circuit is connected to the input end of the BUCK-BOOST circuit, an output end of the input voltage current collecting circuit is connected to a corresponding port of the logic control integrated circuit, and the input voltage current is collected The circuit is configured to acquire an input voltage and an input current of the BUCK-BOOST circuit in real time;

   An output voltage current collecting circuit connected to an output end of the BUCK-BOOST circuit and configured to acquire an output voltage and an output current of the BUCK-BOOST circuit in real time, the output voltage current collecting circuit The output is connected to a corresponding port of the logic control integrated circuit;

   a battery voltage detecting circuit, wherein an input end of the battery voltage detecting circuit is connected to a voltage output end of the target energy storage battery, an output end of the battery voltage detecting circuit is connected to the logic control integrated circuit, and configured to collect the real-time The voltage of the target energy storage battery;

   a battery temperature detecting circuit, wherein an input end of the battery temperature detecting circuit is connected to a heat generating unit of the target energy storage battery, an output end of the battery temperature detecting circuit is connected to the logic control integrated circuit, and configured to collect the target in real time The operating temperature of the energy storage battery;

   a logic control integrated circuit configured to perform internal output data according to the input voltage current collecting circuit, the output voltage current collecting circuit, the battery voltage detecting circuit, and the battery temperature detecting circuit The combination of the op amp circuit and the logic circuit obtains a control signal for the MOS transistor in the BUCK-BOOST circuit, and the control signal is used to adjust the output voltage and the output current of the BUCK-BOOST circuit.
2. The MPPT controller of claim 1 wherein said BUCK-BOOST circuit comprises a chopper inductor and a plurality of MOS transistors.
3. The MPPT controller according to claim 1 or 2, wherein said logic control integrated circuit employs an LT8490 integrated chip;

   An input pin of the input current amplifier of the LT8490 integrated chip is connected to an output current end of the input voltage current collecting circuit, and an input voltage feedback pin of the LT8490 integrated chip is connected to an output voltage end of the input voltage current collecting circuit. The input analog-to-digital conversion pin and the input PWM voltage adjustment pin of the LT8490 integrated chip are respectively connected to corresponding ports of the input voltage current collecting circuit, so as to realize conversion of an input analog signal to an input digital signal and adjustment of an input PWM voltage;

   An input pin of the output current amplifier of the LT8490 integrated chip is connected to an output current end of the output voltage current collecting circuit, and an output voltage feedback pin of the LT8490 integrated chip is connected to an output voltage end of the output voltage current collecting circuit. The output analog-to-digital conversion pin and the output PWM voltage adjustment pin of the LT8490 integrated chip are respectively connected to corresponding ports of the output voltage current collecting circuit, so as to realize conversion of an output analog signal to an output digital signal and adjustment of an output PWM voltage;

   a battery voltage input pin of the LT8490 integrated chip is connected to an output voltage end of the battery voltage detecting circuit, and a temperature detecting pin of the LT8490 integrated chip is connected to an output temperature end of the battery temperature detecting circuit, the LT8490 integrated chip The drive control output pin is connected to the gate control terminal of the corresponding MOS transistor of the BUCK-BOOST circuit.
4. The MPPT controller of claim 3, wherein the input voltage current collecting circuit comprises: an input voltage current collecting resistor (R56), an input measuring filter capacitor (C84), a first input measuring resistor (R24), a second Input measurement resistance (R68), third input measurement resistance (R66), fourth input measurement resistance (R55), fifth input measurement resistance (R54), sixth input measurement resistance (R63), first input measurement capacitance (C90 And a second input measuring capacitance (C66); wherein

   The input voltage current collecting resistor (R56) is connected in parallel with the input measuring filter capacitor (C84) to form a first parallel circuit, and the first end of the first parallel circuit is connected to an output end of the target photovoltaic array, a second end of the first parallel circuit is connected to an input end of the BUCK-BOOST circuit;

   The first end of the first parallel circuit is further connected to the input current amplifier forward input pin CSPIN of the LT8490 integrated chip, and is grounded through the first input measurement capacitor (C90), the first parallel circuit After the two ends are connected in series with the first input measuring resistor (R24), the input current amplifier reverse input pin CSNIN is connected to the LT8490 integrated chip;

   The first end of the first parallel circuit is connected in series with the second input measuring resistor (R68) and the third input measuring resistor (R66), and is connected to an input analog-to-digital conversion pin of the LT8490 integrated chip. FBIR, a connection midpoint of the second input measurement resistor (R68) and the third input measurement resistor (R66) is connected to an input voltage feedback pin FBIN of the LT8490 integrated chip, and is measured by the fifth input The resistor (R54) is grounded;

   a connection midpoint of the second input measurement resistor (R68) and the third input measurement resistor (R66) is sequentially connected in series with the fourth input measurement resistor (R55) and the sixth input measurement resistor (R63) Connected to the input PWM voltage adjustment pin FBIW of the LT8490 integrated chip, the connection midpoint of the fourth input measurement resistor (R55) and the sixth input measurement resistor (R63) is measured by the second input capacitance (C66) Ground.
5. The MPPT controller according to claim 3, wherein the output voltage current collecting circuit comprises: an output voltage current collecting resistor (R57), an output measuring filter capacitor (C83), a first output measuring resistor (R23), and a second Output measurement resistance (R13), third output measurement resistance (R16), fourth output measurement resistance (R71), fifth output measurement resistance (R73), first output measurement capacitance (C87), and second output measurement capacitance (C68 );among them,

   The output voltage current collecting resistor (R57) is connected in parallel with the input measuring filter capacitor (C83) to form a second parallel circuit, and the first end of the second parallel circuit is connected to the output end of the BUCK-BOOST circuit. The second end of the second parallel circuit is connected to the input end of the target energy storage battery;

   The first end of the second parallel circuit is connected to the output current amplifier forward input pin CSPOUT of the LT8490 integrated chip, and is grounded through the first output measurement capacitor (C87), and the second of the second parallel circuit After the terminal is connected in series with the first output measuring resistor (R23), connected to the output current amplifier inverting input pin CSNOUT of the LT8490 integrated chip;

   The second end of the second parallel circuit is connected in series to the second output measuring resistor (R13), the fourth output measuring resistor (R71) and the fifth output measuring resistor (R73), and then connected to the second end The output PWM voltage adjustment pin FBOW of the LT8490 integrated chip, the connection midpoint of the second output measurement resistor R13 and the fourth output measurement resistor R71 are respectively connected to the output voltage feedback pin FBOUT of the LT8490 integrated chip and Outputting an analog-to-digital conversion pin FBOR, and grounding through the third output measuring resistor (R16), the connection midpoint of the fourth output measuring resistor (R71) and the fifth output measuring resistor (R73) The second output measurement capacitor (C68) is grounded.
6. The controller controller according to claim 3, wherein said battery temperature detecting circuit comprises: a temperature sensor, a temperature measuring resistor (R94), and a temperature measuring capacitor (C74);

   The temperature collecting end of the temperature sensor is connected to the heat generating unit of the target energy storage battery, and the temperature output end of the temperature sensor is connected to the temperature detecting pin TEMPSENSE of the LT8490 integrated chip, and passes the temperature measuring resistor (R94) The temperature measuring capacitors (C74) are respectively grounded, and the power input terminal of the temperature sensor is connected to the DC voltage output terminal VDD of the LT8490 integrated chip.
7. The MPPT controller according to claim 3, wherein the BUCK-BOOST circuit comprises: a first MOS transistor (M1), a second MOS transistor (M2), a third MOS transistor (M3), and a fourth MOS transistor ( M4) and chopper inductance (L1);

   The first MOS transistor (M1) is sequentially connected in series with the chopper inductor (L1) and the fourth MOS transistor (M4), and the first MOS transistor (M1) and the chopper inductor after being connected in series L1) and the fourth MOS transistor (M4) are connected between an output end of the target photovoltaic array and an input end of the target energy storage battery, and a gate control end of the first MOS transistor (M1) is connected The first upper MOS driving pin TG1 of the LT8490 integrated chip, the gate control end of the fourth MOS transistor (M4) is connected to the second upper MOS driving pin TG2 of the LT8490 integrated chip;

   a first end of the second MOS transistor (M2) is connected to a connection midpoint of the first MOS transistor (M1) and the chopper inductor (L1), and a second end of the second MOS transistor (M2) Grounding, the gate control end of the second MOS transistor (M2) is connected to the first lower MOS driving pin BG1 of the LT8490 integrated chip;

   a first end of the third MOS transistor (M3) is connected to a connection midpoint of the chopper inductor (L1) and the fourth MOS transistor (M4), and a second end of the third MOS transistor (M3) Grounding, the gate control terminal of the third MOS transistor (M3) is connected to the second lower MOS driving pin BG2 of the LT8490 integrated chip.
8. The MPPT controller of claim 7, wherein the BUCK-BOOST circuit further comprises:

   a first standby MOS transistor (M1-1) connected in parallel with the first MOS transistor (M1), a second standby MOS transistor (M2-1) connected in parallel with the second MOS transistor (M2), and a third MOS transistor (M3) a third standby MOS transistor (M3-1) connected in parallel and a fourth standby MOS transistor (M4-1) connected in parallel with the fourth MOS transistor M4, wherein

   The first standby MOS transistor (M1-1) and the first MOS transistor (M1) are mutually standby, and the second standby MOS transistor (M2-1) and the second MOS transistor (M2) are mutually Standby, the third standby MOS transistor (M3-1) and the third MOS transistor (M3) are mutually standby, and the fourth standby MOS transistor (M4-1) and the fourth MOS transistor (M4) Mutual backup.
9. The MPPT controller according to claim 5, wherein

   The output voltage feedback pin FBOUT of the LT8490 integrated chip serves as the battery voltage input pin at the same time;

   A connection midpoint of the second output measuring resistor (R13) and the fourth output measuring resistor (R71) simultaneously serves as an output voltage terminal of the battery voltage detecting circuit.
10. The MPPT controller according to claim 7, wherein said MPPT controller further comprises a chopper inductor current detecting circuit, said chopper inductor current detecting circuit comprising chopper current collecting resistor (R44), first chopping Current measuring resistor (R8), second chopping current measuring resistor (R9), first chopping current measuring capacitor (C12), second chopping current measuring capacitor (C14) and third chopping current measuring capacitor (C15) ;among them,

    a first end of the chopping current collecting resistor (R44) is connected to the second end of the second MOS transistor (M2) and the third MOS transistor (M3), and the first chopping current measuring resistor is passed (R8) connected to the chopping current forward input pin CSP of the LT8490 integrated chip, the second end of the chopping current collecting resistor (R44) is grounded, and the second chopping current measuring resistor (R9) a chopping current inverting input pin CSN connected to the LT8490 integrated chip;

    The chopping current forward input pin CSP is grounded through the second chopping current measuring capacitor (C14), and the chopping current inverting input pin CSN passes the third chopping current measuring capacitor (C15) Grounding, and the chopping current forward input pin CSP and the chopping current inverting input pin CSN are connected to the first chopping current measuring capacitor (C1).
11. The MPPT controller of any of claims 1-10, wherein the MPPT controller is a solar drone MPPT controller.
12. A power supply system comprising: a target photovoltaic array, a target energy storage battery, and an MPPT controller according to any one of claims 1 to 10;

    An output end of the target photovoltaic array is connected to an input end of the MPPT controller, an output end of the MPPT controller is connected to an input end of the target energy storage battery, and an output end of the target energy storage battery is connected to a target load Power input.
13. The power supply system of claim 12 wherein said power supply system is a solar drone power supply system and said target load is said solar drone load.

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