Battery-free calculator based on solar power supply

Abstract

The utility model discloses a solar power supply-based battery-free calculator which comprises a charging module, a voltage stabilizing module and a calculator host module, and the charging module is connected with the calculator host module through the voltage stabilizing module; the charging module comprises a solar cell panel which is provided with a solar cell output positive electrode and a solar cell output negative electrode. The anti-reverse unit is provided with an anti-reverse positive electrode and an anti-reverse negative electrode; a farad capacitor; the output anode of the solar cell is connected with the anti-reverse anode; the farad capacitor is connected in parallel to two ends of the solar cell panel and the anti-reverse unit; the anti-inversion cathode and the solar cell output cathode are respectively used as a power supply anode and a power supply cathode of the charging module; and the power supply anode is connected with the calculator host module through the voltage stabilizing module. The calculator supplies power to the calculator based on the Lafarad capacitor and the solar cell panel, has the function of automatically switching the power supply mode, can avoid using a disposable battery, reduces the cost of using the calculator by a user, and reduces pollution to the environment.

Description

Technical Field

[0001] This utility model relates to the field of testing calculators, specifically to a battery-free calculator powered by solar energy. Background Technology

[0002] Ordinary solar calculators typically use a dual power supply method, consisting of a solar cell and a button cell battery. The button cell battery provides the primary power, while the solar cell provides auxiliary power.

[0003] Solar-assisted power supply can only slightly extend the battery's lifespan. The battery still needs to be replaced after it is depleted. On the one hand, purchasing new batteries requires additional costs, increasing the cost of using the calculator for users. On the other hand, discarding batteries can also cause some pollution problems. Utility Model Content

[0004] Accordingly, this utility model provides a battery-free calculator based on solar power, including a charging module, a voltage regulator module and a calculator main unit module, wherein the charging module is connected to the calculator main unit module via the voltage regulator module;

[0005] The charging module includes

[0006] A solar panel has a positive output electrode and a negative output electrode.

[0007] The anti-reverse unit has an anti-reverse positive electrode and an anti-reverse negative electrode;

[0008] Farad capacitor;

[0009] The positive output electrode of the solar cell is connected to the anti-reverse positive electrode;

[0010] The supercapacitor is connected in parallel across the solar panel and the anti-reverse unit;

[0011] The anti-reverse negative electrode and the output negative electrode of the solar cell serve as the positive and negative power supply electrodes of the charging module, respectively.

[0012] The positive power supply terminal is connected to the calculator host module via the voltage regulator module.

[0013] In an optional implementation, the anti-reverse unit is a diode or a field-effect transistor.

[0014] In an optional implementation, a first resistor is connected in series on the branch corresponding to the solar panel and the anti-reverse unit.

[0015] In an optional implementation, a second resistor is connected in series in the branch corresponding to the supercapacitor.

[0016] In an optional implementation, the voltage regulator module includes a low-dropout linear regulator.

[0017] In an optional implementation, the calculator host module includes a central control chip, which has an RSTB reset pin;

[0018] The battery-free calculator also includes a voltage detection and reset module. The detection terminal of the voltage detection and reset module is connected between the voltage regulator module and the charging module, and the control terminal of the voltage detection and reset module is connected to the RSTB reset pin.

[0019] An optional implementation also includes a calculator body and a flip cover, the flip cover being hinged to the calculator body;

[0020] The solar panel is mounted on the flip cover, or the solar cell is mounted on the calculator body.

[0021] In an optional embodiment, when the solar panel is disposed on the flip cover, one solar panel is disposed on the front and one on the back of the flip cover.

[0022] In an optional implementation, in the charging module, voltage regulator module, and calculator main unit module, all components except the solar panel are mounted on the calculator body.

[0023] In an optional embodiment, a positive connection hinge and a negative connection hinge are provided at the hinge position between the flip cover and the calculator body;

[0024] The positive output electrode of the solar cell is connected to the positive electrode connecting hinge based on the positive electrode brush;

[0025] The negative electrode of the solar cell is connected to the positive electrode via a hinge shaft based on a negative electrode brush.

[0026] In summary, this utility model provides a battery-free calculator powered by solar energy. The calculator is powered by a Lafarge capacitor and a solar panel, and has an automatic power supply mode switching function. This avoids the use of disposable batteries, reduces the cost for users, and reduces environmental pollution. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a battery-free calculator based on solar power, according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the circuit structure of the charging module and voltage regulator module according to an embodiment of the present utility model.

[0030] Figure 3 This is a schematic diagram of the voltage detection and reset module circuit structure according to an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the calculator chip wiring circuit structure of the calculator host module according to an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the display screen wiring circuit structure of the calculator host module according to an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the button wiring circuit structure of the calculator host module according to an embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the peripheral circuit structure of the calculator chip in the calculator host module of this utility model embodiment.

[0035] Figure 8 This is a three-dimensional structural diagram of the calculator according to an embodiment of the present invention. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0037] Figure 1 This is a schematic diagram of the structure of a battery-free calculator based on solar power, according to an embodiment of the present invention.

[0038] This utility model provides a battery-free calculator powered by solar energy, including a charging module 100, a voltage regulator module 6, and a calculator host module 9. The charging module 100 is connected to the calculator host module 9 via the voltage regulator module 6.

[0039] Specifically, in this embodiment of the invention, the charging module includes...

[0040] Solar panel 1 has a positive output electrode and a negative output electrode;

[0041] Anti-reverse unit 2 has an anti-reverse positive electrode and an anti-reverse negative electrode;

[0042] 5 farads;

[0043] The positive output electrode of the solar cell is connected to the anti-reverse positive electrode;

[0044] The supercapacitor 5 is connected in parallel across the solar panel 1 and the anti-reverse unit 2;

[0045] The anti-reverse negative electrode and the output negative electrode of the solar cell serve as the positive and negative power supply electrodes of the charging module, respectively.

[0046] The positive power supply terminal is connected to the calculator host module 9 via the voltage regulator module 6.

[0047] In this embodiment of the invention, the solar panel serves as the energy source for the entire calculator system. Based on the circuit structure design, the solar panel can not only directly supply power to the external charging module but also charge the supercapacitors inside the charging module. A supercapacitor (also known as a super capacitor) is a new type of energy storage device that falls between traditional capacitors and batteries. Compared to traditional capacitors, it has higher energy density; compared to batteries, it has higher power density and a longer cycle life. In practical applications, the charging module's function is to provide energy to the external environment. Under sunlight conditions, the solar panel can supply power to the external environment, and the surplus power is used to charge the supercapacitors. After charging, the supercapacitors have a certain energy storage function. When sunlight conditions are not ideal, the voltage on the end side of the solar panel drops, and the supercapacitors assist the charging module in discharging externally, automatically switching the power supply mode.

[0048] When the lighting conditions are not ideal, the voltage on the side of the solar panel drops, and the voltage on the side of the supercapacitor will be higher than that of the solar panel. In order to avoid energy loss caused by the backlash of the supercapacitor to the solar panel, this embodiment of the invention can prevent the supercapacitor from backlashing the solar panel by setting an anti-reverse unit.

[0049] Accordingly, to meet usage requirements, the open-circuit voltage of the solar panel should be slightly higher than the rated voltage of the supercapacitor to satisfy the charging function requirements of the solar panel for the supercapacitor. Furthermore, the open-circuit voltage of the solar panel should not be too high to ensure the voltage stability of the power supply from the charging module. In this embodiment, the rated open-circuit voltage of the solar panel can be selected as 2.8V, and the rated voltage of the supercapacitor can be selected as 2.7V.

[0050] Based on the power supply requirements of the calculator host module, the voltage regulator module 6 needs to adjust the power output of the charging module to the actual voltage required by the calculator host module; therefore, the design and selection of the voltage regulator module 6 need to be confirmed based on the actual voltage output of the charging module and the operating voltage of the chip in the calculator host module.

[0051] Furthermore, a first resistor is connected in series on the branch corresponding to the solar panel and the anti-reverse unit. On the one hand, the first resistor can be used to discharge excess electrical energy (when the supercapacitor is fully charged and the external calculator is not turned on, the solar panel will generate excess electrical energy); on the other hand, the solar panel may be damaged due to excessive open circuit voltage when it is unloaded, and the resistor provides a minimum load to ensure stable voltage output.

[0052] Furthermore, the equivalent resistance (ESR) of a supercapacitor is small during initial charging, which may cause a large current surge. The current needs to be controlled by a current-limiting resistor or a constant current (CC) circuit. In this embodiment of the invention, a second resistor is connected in series in the branch corresponding to the supercapacitor. The second resistor is mainly used to limit the large current generated by the supercapacitor during the initial charging stage.

[0053] In practice, based on cost considerations, the anti-reverse unit is a diode, specifically a PMOS ideal diode circuit; in actual use, the anti-reverse unit can also be a field-effect transistor, specifically a metal-oxide-semiconductor field-effect transistor.

[0054] Specifically, the voltage regulator module 6 includes a low-dropout linear regulator. Specifically, due to the size limitations of the calculator, the power supply voltage of the solar panel in this embodiment is generally below 3.5V, while the operating voltage of common calculator chips is between 1V and 2.5V. Since the voltage difference between the two is small, traditional linear regulators require a voltage difference of 1.5V-2V, which cannot adequately meet the requirements. Therefore, the voltage regulator module uses a low-dropout linear regulator, which can operate stably when the input and output voltage difference is extremely low (typically 0.2V-0.5V), fully utilizing the power of the charging module while meeting practical functional requirements.

[0055] Basically, the calculator host module includes a central control chip, which has an RSTB reset pin;

[0056] The battery-free calculator also includes a voltage detection and reset module. The detection terminal of the voltage detection and reset module is connected between the voltage regulator module and the charging module, and the control terminal of the voltage detection and reset module is connected to the RSTB reset pin.

[0057] Specifically, the voltage detection and reset module is mainly used to ensure the normal operation of the calculator. When the power supply voltage of the calculator's main module chip is too low, without a voltage detection and reset module, data drift errors will occur, affecting the stability of the calculator's calculation results. With the addition of the voltage detection and reset module, by detecting the voltage between the voltage regulator module and the charging module (actually the output voltage of the charging module), when the output voltage of the charging module is insufficient, the control terminal of the voltage detection and reset module will output a specific level signal (generally a low level signal) according to the reset signal requirements of the calculator chip, triggering the chip's reset mechanism to avoid program instability or data corruption due to insufficient voltage. It is important to note that the detection point must be set before the voltage regulator module. When the input voltage is lower than the output voltage, the voltage regulator module will generally cut off directly, and the low-voltage characteristic cannot trigger the chip's reset function.

[0058] Specifically, this utility model also provides a specific implementation structure for the charging module, voltage regulator module, and calculator host module for reference. It should be noted that this utility model embodiment only describes some important circuit structures, and the remaining accessory circuit structures can be implemented and understood based on existing technology; and since the overall circuit topology diagram is too large, it will be broken down into local circuit structures for description in the following sections, and different local circuits will be connected based on interfaces with the same markings.

[0059] Figure 2 This is a schematic diagram of the charging module and voltage regulator module circuit structure according to an embodiment of the present invention. VDD is the connection interface with the calculator host module, and TEST is the detection terminal interface of the voltage detection and reset module. Specifically, the solar panel parameters can be selected from two models: 300Lux (50-119μA) and 500Lux (50-168μA). The pull-farm capacitor can be selected from two models: 10F / 2.7V and 5F / 2.7V. When the pull-farm capacitor is 10F / 2.7V, the second current-limiting resistor is selected as 30KΩ; when the pull-farm capacitor is 5F / 2.7V, the second current-limiting resistor is selected as 20KΩ; the first resistor value is selected as 10Ω. The voltage regulator module used in this embodiment of the present invention is model R1180N121, where CE is the comparator terminal.

[0060] Figure 3 This is a schematic diagram of the voltage detection and reset module circuit structure according to an embodiment of the present invention. The voltage detection and reset chip is an XC61CN1202MR, which outputs a low level when the TEST terminal voltage is detected to be too low, and a high level when it is normal. A manual switch is also connected to the RST port for manually triggering the calculator's reset.

[0061] Figure 4This is a schematic diagram of the calculator chip wiring circuit structure of the calculator host module according to an embodiment of this utility model. The chip model used is ePS7100. The ePS7100 is an 8-bit RISC MCU that embeds a 5 x 40 LCD driver, two 8-bit timers, a 16-bit general-purpose timer, and a watchdog timer. It also has 0.5K bytes of on-chip RAM and 10K words of program ROM. It is well-suited for advanced scientific calculator applications, especially those requiring high-performance and low-cost solutions. The MCU core is one of ELAN's second-generation RISC-based ICs, called the RISCII (RII) series. This core is designed for low-power and portable device applications. The ePS7100 also supports Fast, Slow, and Idle modes, as well as Sleep mode, to enhance its low-power capabilities.

[0062] Figure 5 This is a schematic diagram of the display screen wiring circuit structure of the calculator host module according to an embodiment of the present invention. The connection relationship between the pins of the display screen and the calculator chip is shown in the diagram.

[0063] Figure 6 This is a schematic diagram of the button wiring circuit structure of the calculator host module according to an embodiment of the present invention. Specifically, each button in the schematic circuit diagram corresponds to a physical button, and the connection relationship between the wiring interface listed in the circuit structure and the calculator chip is shown in the diagram.

[0064] Figure 7 This is a schematic diagram of the peripheral circuit structure of the calculator chip in the calculator host module according to an embodiment of this utility model. Specifically, the peripheral circuit is mainly set according to the selected calculator chip, and can be implemented with reference to existing technology.

[0065] Figure 8 This is a three-dimensional structural diagram of the calculator according to an embodiment of the present invention.

[0066] Furthermore, the battery-free calculator based on solar power also includes a calculator body 202 and a flip cover 201, the flip cover 201 being hinged to the calculator body 202; the solar panel 1 is disposed on the flip cover 201 to increase the coverage area of ​​the solar panel and increase the power generation.

[0067] Furthermore, a solar panel is provided on both the front and back of the flip cover of the solar panel to further increase the coverage area of ​​the solar panel and increase the power output.

[0068] Correspondingly, in the charging module, voltage regulator module, and calculator main unit module, all components except the solar panel are mounted on the calculator body.

[0069] Optionally, a positive pole connecting hinge 21 and a negative pole connecting hinge 22 are provided at the hinge position between the flip cover 201 and the calculator body 202.

[0070] The positive output electrode of the solar cell is connected to the positive electrode connecting hinge 21 based on the positive electrode brush;

[0071] The negative electrode of the solar cell is connected to the positive electrode connecting hinge 22 via a negative electrode brush.

[0072] Specifically, the flip cover and the calculator body are hinged together. Since electrical conduction is required between the flip cover and the calculator body, a hinge is needed to ensure reliable electrical transmission. Specifically, brush 23 remains in contact with the corresponding hinge throughout the flip cover's movement.

[0073] In summary, this utility model provides a battery-free calculator powered by solar energy. The calculator is powered by a Lafarge capacitor and a solar panel, and has an automatic power supply mode switching function. This avoids the use of disposable batteries, reduces the cost for users, and reduces environmental pollution.

[0074] The above provides a detailed description of a battery-free calculator based on solar power provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery-free calculator powered by solar energy, comprising a charging module, a voltage regulator module, and a calculator main unit module, wherein the charging module is connected to the calculator main unit module via the voltage regulator module; Its features are, The charging module includes A solar panel has a positive output electrode and a negative output electrode. The anti-reverse unit has an anti-reverse positive electrode and an anti-reverse negative electrode; Farad capacitor; The positive output electrode of the solar cell is connected to the anti-reverse positive electrode; The supercapacitor is connected in parallel across the solar panel and the anti-reverse unit; The anti-reverse negative electrode and the output negative electrode of the solar cell serve as the positive and negative power supply electrodes of the charging module, respectively. The positive power supply terminal is connected to the calculator host module via the voltage regulator module.

2. The battery-free calculator based on solar power as described in claim 1, characterized in that, The anti-reverse unit is a diode or a field-effect transistor.

3. The battery-free calculator based on solar power as described in claim 1, characterized in that, A first resistor is connected in series on the branch corresponding to the solar panel and the anti-reverse unit.

4. The battery-free calculator based on solar power as described in claim 1, characterized in that, A second resistor is connected in series in the branch corresponding to the farad capacitor.

5. The battery-free calculator based on solar power as described in claim 1, characterized in that, The voltage regulator module includes a low-dropout linear regulator.

6. The battery-free calculator based on solar power as described in claim 1, characterized in that, The calculator host module includes a central control chip, which has an RSTB reset pin. The battery-free calculator also includes a voltage detection and reset module. The detection terminal of the voltage detection and reset module is connected between the voltage regulator module and the charging module, and the control terminal of the voltage detection and reset module is connected to the RSTB reset pin.

7. The battery-free calculator based on solar power as described in claim 1, characterized in that, It also includes a calculator body and a flip cover, the flip cover being hinged to the calculator body; The solar panel is mounted on the flip cover, or the solar cell is mounted on the calculator body.

8. The battery-free calculator based on solar power as described in claim 7, characterized in that, When the solar panel is mounted on the flip cover, one solar panel is mounted on the front and one on the back of the flip cover.

9. The battery-free calculator based on solar power as described in claim 7, characterized in that, In the charging module, voltage regulator module, and calculator main unit module, all components except the solar panel are mounted on the calculator body.

10. The battery-free calculator based on solar power as described in claim 8, characterized in that, A positive terminal connecting hinge and a negative terminal connecting hinge are provided at the hinge position between the flip cover and the calculator body; The positive output electrode of the solar cell is connected to the positive electrode connecting hinge based on the positive electrode brush; The negative electrode of the solar cell is connected to the positive electrode via a hinge shaft based on a negative electrode brush.

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