WO2017148118A1

WO2017148118A1 - Photovoltaic charging cellphone case

Info

Publication number: WO2017148118A1
Application number: PCT/CN2016/097199
Authority: WO
Inventors: 潘加龙; 郑鲁杰; 陈庆威
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-03-03
Filing date: 2016-08-29
Publication date: 2017-09-08
Also published as: CN107149250A

Abstract

A photovoltaic charging cellphone case (1), comprising: a photovoltaic panel group (11), a maximum power point tracking circuit (12) and a charging circuit (13). The photovoltaic panel group (11) is configured to convert light energy into electric energy, and the maximum power point tracking circuit (12) is configured to track the maximum power point of the photovoltaic panel group (11) and output the electric energy of the maximum power point to a battery of a device via the charging circuit (13), wherein the maximum power point tracking circuit (12) is connected to the photovoltaic panel group (11). The maximum power point tracking circuit (12) is integrated in the photovoltaic charging cellphone case (1) to track the maximum power point of the photovoltaic panel group (11) so as to realize the maximum power output, so that the charging voltage and current can both be matched reasonably, thereby solving the related problem that a photovoltaic design of a cellphone protection case needs to independently carry a control apparatus, and also shortening the charging time, improving the charging efficiency and enhancing the user experience.

Description

Photovoltaic charging mobile phone case

Technical field

This article refers to, but is not limited to, the field of mobile phone cases, and relates to a photovoltaic charging mobile phone case.

Background technique

In order to enhance the function of the mobile phone case, the related technology provides a mobile phone protective cover with photovoltaic power generation, and currently has a mobile phone protective cover for photovoltaic power generation, one is to directly charge the mobile phone by using the selected solar photovoltaic panel; the other is to use photovoltaic power generation. The control device controls the photovoltaic charging, and generally such a controller is independent.

For photovoltaic charging without a control device, it is not feasible from the perspective of safety, and the battery charging process and battery life are not properly controlled. For photovoltaic charging with control devices, the controllers are independent, which is inconvenient for people traveling in the wild, and the controllers are of different sizes, the internal circuit design is complicated, the price is high, and the charging efficiency is low; If the traveler forgets to bring the controller, the mobile phone case with photovoltaic control loses its function. Even with such a charger, there are the following problems: First, it is bulky and inconvenient; second, the charging scheme is inefficient, and the traveler needs to stop for a long time to charge the mobile phone. Therefore, the photovoltaic design of the relevant mobile phone case needs to carry the control device separately, which is inconvenient for the user to use.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

Embodiments of the present invention provide a photovoltaic charging mobile phone case, which solves the problem that the photovoltaic design of the related mobile phone protective cover needs to carry the control device separately.

Embodiments of the present invention provide a photovoltaic charging mobile phone case, which includes: a photovoltaic panel group, a maximum power point tracking circuit, and a charging circuit;

The photovoltaic panel group is configured to convert light energy into electrical energy;

The maximum power point tracking circuit is configured to track a maximum power point of the photovoltaic panel group, and output the electrical energy of the maximum power point to the device battery through the charging circuit; wherein the most A high power point tracking circuit is coupled to the photovoltaic panel set.

Optionally, the photovoltaic charging mobile phone case further includes: a first anti-reverse diode and a second anti-reverse diode;

The first anti-reverse diode is disposed between the photovoltaic panel group and the maximum power point tracking circuit;

The second anti-reverse diode is disposed between the maximum power point tracking circuit and the charging circuit.

Optionally, the photovoltaic panel group includes at least two photovoltaic panels, and the power output ends of each photovoltaic panel are respectively connected in parallel to the maximum power point tracking circuit, and the photovoltaic panel is a high efficiency polycrystalline silicon laminated solar panel.

Optionally, the photovoltaic charging mobile phone case further includes: a charging control circuit and a battery voltage detecting circuit;

a battery voltage detecting circuit, wherein the charging control circuit is configured to perform charging control on an output power of the maximum power point tracking circuit;

The battery voltage detecting circuit is configured to detect a battery voltage of the device battery and a charging current output by the charging control circuit, and control the charging control circuit according to the detection result;

The charging control circuit is disposed between the maximum power point tracking circuit and the charging circuit; and the battery detecting power is connected to the charging control circuit.

Optionally, the charging control circuit includes a switching circuit composed of a plurality of MOS transistors and a main chip; wherein a gate control voltage of the plurality of MOS transistors is provided by the main chip.

Optionally, the maximum power point tracking circuit is disposed in the photovoltaic charging mobile phone case in the form of an integrated circuit.

Optionally, the maximum power point is used to track an environment detection circuit, and a synchronous voltage drop circuit; the maximum power point tracking circuit is configured to detect an ambient temperature and a light intensity of the photovoltaic panel group;

The synchronous voltage drop circuit is configured to perform a voltage drop process on an output voltage of the photovoltaic panel group under the control of the environment detecting circuit.

Optionally, the environment detection circuit includes a charge management chip, and a thermistor and/or temperature Detector;

The thermistor is configured to detect an ambient temperature, the temperature detector is configured to detect an ambient temperature, and the charge management chip is configured to detect the output power of the photovoltaic panel group.

Optionally, the thermistor is formed by a non-linear thermistor and a matching resistor, and is formed in series with the voltage dividing resistor.

Optionally, the maximum power point tracking circuit includes: a synchronous voltage drop circuit and a control circuit, wherein the synchronous voltage drop circuit is configured to perform voltage drop processing on an output voltage of the photovoltaic panel group, and the control circuit is configured to detect The working environment controls the synchronous voltage drop circuit according to the working environment.

Optionally, the control circuit is configured to: collect a working environment in real time through a control chip, and control turn-on and turn-off of the synchronous voltage drop circuit according to the working environment, where the working environment includes an ambient temperature and a device battery power. Voltage, output voltage and current of the photovoltaic panel group.

Advantageous effects of embodiments of the present invention:

The embodiment of the invention provides a photovoltaic charging mobile phone sleeve, which can track the maximum power point of the photovoltaic panel by integrating the maximum power point tracking circuit in the mobile phone sleeve, thereby realizing the maximum power output, so that the charging voltage and the current can be reasonably matched, and the solution is solved. The photovoltaic design of the related mobile phone case requires the problem of carrying the control device separately, and at the same time, the charging time is shortened, the charging efficiency is improved, and the user experience is enhanced. Other aspects will be apparent upon reading and understanding the drawings and detailed description.

DRAWINGS

1 is a schematic structural diagram of a photovoltaic charging mobile phone case provided by a first embodiment of the present application;

2 is a schematic diagram of a photovoltaic charging mobile phone case provided by a second embodiment of the present application;

3 is a schematic structural diagram of a photovoltaic charging mobile phone case provided by a third embodiment of the present application;

4 is a schematic diagram of circuit connection of a photovoltaic charging mobile phone case in a third embodiment of the present application;

FIG. 5 is a schematic diagram of a change of a light-emitting tube of a charging circuit in a third embodiment of the present application; FIG.

FIG. 6 is a schematic structural diagram of a photovoltaic charging mobile phone case according to a fourth embodiment of the present application.

detailed description

The present application will be further illustrated by the specific embodiments in conjunction with the accompanying drawings.

First embodiment:

FIG. 1 is a schematic structural diagram of a photovoltaic charging mobile phone case provided by the first embodiment of the present invention. As shown in FIG. 1 , in the embodiment, the photovoltaic charging mobile phone case 1 includes: a photovoltaic panel group 11 and a MPPT (Maximum Power Point Tracking). Power point tracking circuit 12 and charging circuit 13;

The photovoltaic panel group 11 is arranged to convert light energy into electrical energy; the MPPT circuit 12 is arranged to track the maximum power point of the photovoltaic panel group 11 and output the electrical energy of the maximum power point to the device battery through the charging circuit 13; the MPPT circuit 12 and The photovoltaic panel group 11 is connected.

Optionally, the photovoltaic charging mobile phone case 1 in the above embodiment further includes: a first anti-reverse diode and a second anti-reverse diode; wherein the first anti-reverse diode is disposed between the photovoltaic panel group and the MPPT circuit, and the second protection The anti-diode is disposed between the MPPT circuit and the charging circuit.

Optionally, the photovoltaic panel group 11 in the above embodiment includes at least two photovoltaic panels, and the power output ends of each photovoltaic panel are respectively connected in parallel to the MPPT circuit, and the photovoltaic panel is a high efficiency polycrystalline silicon laminated solar panel.

Optionally, the photovoltaic charging mobile phone case 1 in the above embodiment further includes: a charging control circuit and a battery detecting power; the battery voltage detecting circuit charging control circuit is configured to perform charging control on the output power of the MPPT circuit, and the battery voltage detecting circuit is set to Detecting a battery voltage of the device battery and a charging current output by the charging control circuit, and controlling the charging control circuit according to the detection result;

Optionally, the charging control circuit in the above embodiment includes a switching circuit composed of a plurality of MOS transistors and a main chip, wherein gate control voltages of the plurality of MOS transistors are provided by the main chip.

Optionally, the MPPT circuit 12 in the above embodiment is disposed in the form of an integrated circuit in a photovoltaic charging mobile phone case.

Optionally, in the above embodiment, the maximum power point is used to track the environment detection circuit and the synchronous voltage drop circuit; the MPPT circuit 12 is configured to detect the ambient temperature and the illumination intensity of the photovoltaic panel group; and the synchronous voltage drop circuit is set to Output voltage to the photovoltaic panel group under the control of the environmental detection circuit Perform pressure drop processing.

Optionally, the environment detecting circuit in the above embodiment includes a charging management chip, and a thermistor and/or a temperature detector;

The thermistor is configured to detect an ambient temperature, the temperature detector is configured to detect an ambient temperature, and the charge management chip is configured to detect a photovoltaic panel group output power.

Optionally, the thermistor in the above embodiment is formed by juxtaposing the nonlinear thermistor and the matching resistor in series with the voltage dividing resistor.

Optionally, the MPPT circuit 12 in the foregoing embodiment includes: a synchronous voltage drop circuit and a control circuit, wherein the synchronous voltage drop circuit is configured to perform voltage drop processing on the output voltage of the photovoltaic panel group, and the control circuit is configured to detect the working environment, according to the work. Environmentally controlled synchronous voltage drop circuit.

Optionally, the control circuit in the foregoing embodiment is configured to: collect the working environment in real time through the control chip, and control the turn-on and turn-off of the synchronous voltage drop circuit according to the working environment, and the working environment includes the ambient temperature, the device battery voltage, and the photovoltaic The output voltage and current of the panel group.

Second embodiment:

The embodiments of the present invention are further explained in conjunction with specific application scenarios.

This embodiment is directed to the defect that the conventional photovoltaic charging scheme is not efficient, because the control system has low precision, the charging efficiency is low, and the photovoltaic charging efficiency is greatly affected in regions with large temperature differences in the four seasons. In practical applications, since the photovoltaic panel has its own unique photovoltaic charging curve, the most suitable charging voltage and current are at its maximum power point, so that the charging voltage and current can be reasonably matched, thereby shortening the charging time and improving the charging. effectiveness.

The photovoltaic charging mobile phone case provided by the embodiment of the invention comprises: two photovoltaic panels on the front and back of the photovoltaic charging mobile phone case, an MPPT circuit, a charging control circuit, a battery voltage detecting circuit, a charging circuit, and in the embodiment, the photovoltaic panel outputs the electric energy It is input to the charging circuit through the maximum power tracking circuit and then charged into the mobile phone battery. This kind of photovoltaic panel adopts high-efficiency polycrystalline glass laminated solar panel with mature technology and low price. Its built-in photocell can achieve conversion efficiency of 15%, which is much higher than the current 8% conversion efficiency. Solar panel manufacturing costs have been reduced by 10%, solving the problem of both portable and efficient.

The embodiment of the invention adopts an MPPT circuit with wide temperature compensation constant voltage type, and tracks the maximum power point of the solar panel in real time to exert the maximum output efficiency of the photovoltaic panel. Through the output feedback matching control of the MPPT peripheral circuit, the maximum output power of the photovoltaic panel follows the change of the illumination intensity in real time under certain temperature conditions; by increasing the negative temperature coefficient resistance, the maximum output of the photovoltaic panel under certain light intensity conditions is realized. The power follows the external temperature change in real time. Through the combination of the above two, the MPPT circuit can track the maximum power point of the photovoltaic panel in real time according to the change of external light intensity and ambient temperature, and realize the output of its maximum power. The maximum power point tracking circuit can output corresponding voltage and current at the maximum power point state, and can implement pre-charging, constant current charging, constant voltage charging and floating charging charging processes for the battery, and the maximum power output is then sent to the mobile phone through the charging control circuit. Charging batteries. This output control method can output the maximum power for external light intensity and temperature change, improve the charging speed and efficiency, solve the current situation of slow charging and low efficiency of traditional photovoltaic power generation, and its practicality and reliability can be improved. And the circuit design is simple and integrated on the mobile phone case, which is convenient for the traveler and the charging time is shortened.

The technical problem to be solved by the embodiments of the present invention is to provide a high-efficiency, low-cost mobile phone photovoltaic panel maximum power charging technology for how to conveniently use photovoltaic power generation during travel to efficiently and quickly charge the mobile phone. The solar energy is converted into electrical energy, and the maximum power tracking circuit is passed so that the output voltage and current are input to the mobile phone battery through the charging control circuit.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram of a photovoltaic charging mobile phone case designed according to the embodiment. 201 and 202 represent solar photovoltaic panels on the front and back sides of the photovoltaic charging mobile phone. Due to the limitation of the size of the photovoltaic charging mobile phone cover, The solar photovoltaic panel of the embodiment adopts a high-efficiency polycrystalline silicon glass laminated solar panel, and the built-in photocell has high conversion efficiency. In order to reduce the charging of the mobile phone battery and the supply voltage required for the control chip, a photovoltaic panel with a working voltage of 9V and a working current of 220mA is used, and two photovoltaic panels are connected in parallel on the front and back sides of the photovoltaic charging mobile phone case. The ideal operating conditions required to connect the buck to the cell phone battery and charge control circuit are 5V rated charging voltage and 440mA rated charging current. The space indicated by 203 is used for placing an integrated circuit. Since the circuit of the embodiment is simple and efficient, and the occupied space is not large, it is feasible to be integrated on the photovoltaic charging mobile phone case; 204 denotes a charging circuit, and the line is connected or used in use. Just touch the phone charging port. 205 indicates that the internal space of the mobile phone is placed;

Third embodiment:

3 is a schematic view of the frame of the present embodiment. As can be seen from FIG. 3, the power outputted by the photovoltaic panel 21 is output to the charging control circuit 24 via the MPPT circuit 22, and the main chip in the MPPT circuit 22 supports an input voltage in the range of 5V-28V. The voltage of 5V is set in the output voltage range of 2.1V-26V to the charging control circuit 24, wherein the MPPT circuit 22 collects and detects the ambient temperature and the illumination intensity on the photovoltaic panel 21 in real time through the panel temperature detecting circuit 25, thereby tracking the maximum power point. Maximum charging efficiency. The charging control circuit 24 is a switching circuit composed of a series of MOS tubes, and the gate control voltage thereof is provided by the main chip. Here, the main chip of the charging control circuit 24 can be a single chip microcomputer, a RAM chip or other IC chip capable of controlling functions. . The battery detecting circuit 26 performs negative feedback detection on the electric energy outputted by the charging control circuit 24, and then inputs it into the IC ((Integrated Circuit) control main chip, so that the MOS tube is turned on and off reasonably to prevent the charging voltage. The problem of fluctuation and battery saturation is that the detected output power is connected to the mobile phone port through the charging line to charge the battery. The integrated control circuit in the embodiment of the invention is small in size, designed on the back of the protective cover, and does not need to carry an additional charging device.

4 is an integrated circuit diagram of a photovoltaic charging mobile phone case according to an alternative example of the present invention. The photovoltaic charging mobile phone case in this embodiment has a maximum power photovoltaic power generation function.

As shown in FIG. 4, the module 401 represents two solar photovoltaic panels S1, S2 connected in parallel to collect solar energy for photoelectric conversion, and the photovoltaic panel output end series anti-reverse diodes VD1, VD2, in order to prevent the subsequent current from flowing back to the photovoltaic panel. Here, the working voltage is 9V, and the working current is 220mA polycrystalline solar panel. After two parallel connections, the 9V rated output voltage and 440mA rated output current are obtained, and then the battery is charged after the voltage is reduced to 5V through the synchronous Buck circuit in the MPPT circuit.

The module 402 represents a wide temperature compensated photovoltaic maximum power point tracking circuit, which is connected in parallel with the matching resistor R4 through a nonlinear thermistor (RTC), and then connected in series with R1 and R2 to obtain a thermistor with an approximate linear curve. The ambient temperature on the panel is collected, and the collected temperature value and the value divided by the voltage dividing resistors R1 and R2 are used to adjust the voltage and current values corresponding to the output in the maximum power state. The present application can use RTC thermistor detection, or can use a (Temperature Sensor, TS) temperature detector (as shown in FIG. 4, using a TS temperature detector at the TS), and any temperature detector can be used in the embodiment of the present invention. Implementation is not limited to this.

Q1, Q2, L1, C4 and C5 form a synchronous buck Buck circuit mode when the output of the panel When the power changes due to the light intensity, the Battery Quiescent (BQ) chip will automatically control the external switch to moderately reduce the charging current to maintain a constant charging voltage. If the solar photovoltaic panel cannot provide sufficient power output, the charging current will be Will drop to zero. The sampling resistor Rs selects different resistance values depending on the required current. Resistors R8, R9, R10 and MOS tube Q5 are used to set the constant voltage charging voltage and floating charging voltage. The constant voltage charging voltage is set to 5V. When constant voltage charging, Q5 is turned on, and the lamp D1 is on; the floating charging voltage is set to 4.35. V, when floating charge Q5 is turned off, lamp D2 is on; if there is a bad condition in the system during charging, the lamps D1 and D2 are on at the same time, reminding to stop charging, ensuring reliable operation of the whole system. The output of module 402 is connected in series with anti-reverse diode VD3 in order to prevent subsequent current flow to module 402.

Module 403 represents the charge control circuit and the battery voltage detection circuit. The circuit design further controls the precharge, constant current charge and constant voltage charge. The battery detection circuit is composed of R16, R17 and Ct. When the detected battery voltage is lower than the charging voltage and the charging current is lower than the constant current charging current, the third switching transistor Q3 is turned on, and the pre-charging current is provided by R13. The four-switch Q4 is turned off; when the charging current reaches the constant current charging current, Q3 is turned off and Q4 is turned on; if the system has a bad condition during charging, the control chip MCU (Micro Control Unit) will be Q3. Both Q4 and Q4 are turned off to ensure the safety of the system.

Figure 5 shows the waveform diagram of the output switching transistor and the charging current waveform in the maximum power point tracking circuit. In Figure 5, the time unit of the abscissa is microseconds (time/uSecs), and each cell in the figure is 1us (1uSecs/ Div). The first switching transistor Q1, the second switching transistor Q2 and the inductor L1 form a synchronous buck Buck circuit, and the gate driving voltages VGS(Q1) and VGS(Q2) are alternately turned on, and a certain dead time is left. In order to achieve zero voltage conduction of the second switching transistor Q2, the inherent switching frequency is f=600KHz, and the charging current through the energy storage inductor L1 can reach 400mA.

Optionally, the parameters of the example of the present invention can be set as follows: the rated working voltage of the solar photovoltaic panel is set to 9 VDC; the output voltage is set to 5 VDC; the output current is 220 mA, and the main chip in the maximum power control circuit is BQ24650, and the output current is set to a maximum of 1A; thermistor RTC is 470KΩ/25°C; the voltage dividing resistor R1 is 64.9K, R2 is 10K; the inductance L1 is 15uH; the C4 is 10uF; the detection resistance Rs is 40mΩ; the first switching transistor Q1 and the second switching transistor Q2 Adopt integrated MOS tube Si7288, switching frequency is 600KHz; output matching resistor R8 is 34.8K, R9 is 10.7K, R10 is 10K; Q3, Q4, Q5 are 2N7002; R16 is 30K; R17 is 10K; main control chip The MCU uses the single-chip STC15F104W.

By adopting the maximum power point tracking circuit, the embodiment of the present invention can be 20% to 30% higher than the conventional photovoltaic charging efficiency, which has great development significance for the low-power photovoltaic panel applied on the photovoltaic charging mobile phone case.

Fourth embodiment:

For the utilization of photovoltaic power generation efficiency, a simple and easy method can also be adopted, as shown in FIG. 6, directly using the main control chip MCU controller 67 having an analog-to-digital converter (ADC) acquisition function, and collecting The solar photovoltaic panel 61 voltage, current value, battery power of the mobile phone, and ambient temperature control the synchronous Buck circuit 68 to achieve maximum power point tracking (MPPT).

Applying this scheme to track the maximum power of photovoltaics, the main control chip collects the ambient temperature and the voltage and current values of the photovoltaic panel in real time to calculate the output power of the panel. The power obtained by this detection is compared with the previous power to determine The voltage and current values in the large power state, the main control chip controls the switching tube in the synchronous Buck circuit to charge the mobile phone battery in the maximum power state. The charging voltage in this control scheme cannot keep the voltage constant for constant voltage charging; the charging current cannot keep the current constant for constant current charging, and the power variation range is large, the charging time is long, and the efficiency is not as high as the maximum power tracking effect of the foregoing method. .

In practical applications, the maximum power tracking circuit provided by the third embodiment is used to collect the illumination and ambient temperature in real time to track the maximum power point of the photovoltaic panel, and realize the maximum power output. The output feedback matching control of the MPPT peripheral circuit is realized. Under the temperature condition, the maximum output power of the photovoltaic panel follows the change of the light intensity in real time; by increasing the negative temperature coefficient resistance, under the condition of certain light intensity, the maximum output power of the photovoltaic panel follows the external temperature change in real time, and the combination of the two The MPPT circuit can track the maximum power point of the photovoltaic panel in real time according to changes in ambient light intensity and ambient temperature to achieve its maximum power output. The maximum power point tracking circuit can output corresponding voltage and current at the maximum power point state, and can realize pre-charging, constant current, constant voltage and floating charging process for the battery, and the maximum power output is used to charge the mobile phone battery through the charging control circuit. . This output control method can output the maximum power for external light intensity and temperature change, which improves the charging speed and efficiency and shortens the charging time.

In the fourth embodiment, the MCU control chip collects the ambient temperature, the battery voltage, the photovoltaic voltage and the current in real time to control the turn-on and turn-off of the synchronous Buck circuit to achieve maximum power output. The charging efficiency is improved compared to the conventional scheme, but the output power varies widely and the charging time is still long.

In summary, through the embodiments of the present invention, at least the following beneficial effects exist:

The embodiment of the invention provides a photovoltaic charging mobile phone sleeve, which can track the maximum power point of the photovoltaic panel by integrating the maximum power point tracking circuit in the mobile phone sleeve, thereby realizing the maximum power output, so that the charging voltage and the current can be reasonably matched, and the solution is solved. The photovoltaic design of the existing mobile phone case needs to carry the control device separately, and at the same time, the charging time is shortened, the charging efficiency is improved, and the user experience is enhanced.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function. This application is not limited to any specific combination of hardware and software. A person skilled in the art should understand that the technical solutions of the present application can be modified or equivalent, without departing from the spirit and scope of the technical solutions of the present application, and should be included in the scope of the claims of the present application.

Industrial applicability

The above technical solution realizes the maximum power output, and solves the problem that the photovoltaic design of the related mobile phone protective cover needs to carry the control device separately, and at the same time, the charging time is shortened, the charging efficiency is improved, and the user experience is enhanced.

Claims

A photovoltaic charging mobile phone set includes: a photovoltaic panel group, a maximum power point tracking circuit and a charging circuit;

The photovoltaic panel group is configured to convert light energy into electrical energy;

The maximum power point tracking circuit is configured to track a maximum power point of the photovoltaic panel group, and output the electrical energy of the maximum power point to the device battery through the charging circuit; wherein the maximum power point tracking circuit and the The photovoltaic panel group connection.
The photovoltaic charging mobile phone case of claim 1 further comprising: a first anti-reverse diode and a second anti-reverse diode;

The first anti-reverse diode is disposed between the photovoltaic panel group and the maximum power point tracking circuit;

The second anti-reverse diode is disposed between the maximum power point tracking circuit and the charging circuit.
The photovoltaic charging mobile phone case of claim 1 , wherein: the photovoltaic panel group comprises at least two photovoltaic panels, and the power output ends of each photovoltaic panel are respectively connected in parallel to the maximum power point tracking circuit, the photovoltaic panel For efficient polysilicon glass laminated solar panels.
The photovoltaic charging mobile phone case of claim 1 further comprising: a charging control circuit and a battery voltage detecting circuit;

a battery voltage detecting circuit, wherein the charging control circuit is configured to perform charging control on an output power of the maximum power point tracking circuit;

The battery voltage detecting circuit is configured to detect a battery voltage of the device battery and a charging current output by the charging control circuit, and control the charging control circuit according to the detection result;

The charging control circuit is disposed between the maximum power point tracking circuit and the charging circuit; and the battery detecting power is connected to the charging control circuit.
The photovoltaic charging mobile phone case according to claim 4, wherein said charging control circuit comprises a switching circuit composed of a plurality of MOS transistors and a main chip; wherein a gate control voltage of said plurality of MOS transistors is controlled by said main The chip is available.
The photovoltaic charging mobile phone case of claim 1 wherein: said maximum power point tracking circuit is disposed in said photovoltaic charging mobile phone case in the form of an integrated circuit.
The photovoltaic charging mobile phone case according to any one of claims 1 to 6, wherein:

The maximum power point is used for tracking an environment detecting circuit and a synchronous voltage drop circuit; the maximum power point tracking circuit is configured to detect an ambient temperature and a light intensity of the photovoltaic panel group;

The synchronous voltage drop circuit is configured to perform a voltage drop process on an output voltage of the photovoltaic panel group under the control of the environment detecting circuit.
The photovoltaic charging mobile phone case of claim 7 wherein: said environmental detection circuit comprises a charge management chip, and a thermistor and/or temperature detector;

The thermistor is configured to detect an ambient temperature, the temperature detector is configured to detect an ambient temperature, and the charge management chip is configured to detect the output power of the photovoltaic panel group.
The photovoltaic charging mobile phone case according to claim 8, wherein the thermistor is formed by a non-linear thermistor and a matching resistor in parallel with the voltage dividing resistor.
The photovoltaic charging mobile phone case according to any one of claims 1 to 6, wherein the maximum power point tracking circuit comprises: a synchronous voltage drop circuit and a control circuit, and the synchronous voltage drop circuit is set to the photovoltaic panel group The output voltage is subjected to a voltage drop process, the control circuit is configured to detect a working environment, and the synchronous voltage drop circuit is controlled according to the working environment.
The photovoltaic charging mobile phone case according to claim 10, wherein the control circuit is configured to: collect a working environment in real time through a control chip, and control opening and closing of the synchronous voltage drop circuit according to the working environment, The working environment includes ambient temperature, device battery voltage, and output voltage and current of the photovoltaic panel group.