Multifunctional solar adjustable direct-current stabilized power supply

Abstract

The utility model provides a multifunctional solar adjustable DC stabilized power supply, which comprises a power input device, a master control device and a power output device, the master control device comprises a switch type DC / DC adjustable voltage module, a control and data processing module, a driving circuit, an input module and a display module. The multifunctional charger can be used for charging a mobile phone, a tablet computer, a notebook computer or other occasions needing different direct current voltages, can be used in various electricity utilization occasions such as circuit maintenance power supply and battery capacity estimation, well solves the problem that an existing product is single in function, and improves the diversity and practicability of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of outdoor power supplies, in particular to a multifunctional solar-powered adjustable direct current stable power supply. Background Art

[0002] With the rapid development of science and technology, the electricity-consuming industries such as smart life, AI intelligence and new energy vehicles are developing in full swing. Among them, smart life will become the development trend of people's future life. More and more people use mobile phones, tablets, laptops and other portable electronic devices. When they are in the wild, in the mountains or at sea, they put forward higher requirements for power supply equipment. Most of the existing products are ordinary power banks, or portable solar charging packs that can only provide USB charging. It is relatively rare to concentrate multiple different charging occasions or adjustable DC stable power supplies in one product, and it is also impossible to display the voltage, current, real-time power and total power in real time, which brings many inconveniences to users in long-term travel, exploration and outdoor life. Utility Model Content

[0003] The purpose of the utility model is to provide a multifunctional solar-powered adjustable DC stable power supply to solve the problems of the existing power supply having unadjustable output voltage, limited operating temperature and inability to display multi-dimensional charging information in real time.

[0004] The utility model is implemented as follows: a multifunctional solar adjustable DC stable power supply includes a power input device, a main control device and a power output device; the main control device includes a switch type DC / DC adjustable voltage module, a control and data processing module, a drive circuit, an input module, and a display module;

[0005] The input end of the switch-type DC / DC adjustable voltage module is connected to the power input device through a switch; the switch-type DC / DC adjustable voltage module has two power output ends, one is a 5V voltage output connected in series with the resistor R2, and the other is an adjustable voltage output connected in series with the resistor R3;

[0006] The clock terminal clk and the data input and output terminal data of the switch type DC / DC adjustable voltage module are connected to the control and data processing module;

[0007] The sampling circuit is connected to the control and data processing module through the signal arrangement module;

[0008] The control and data processing module is connected with the input module and the display module through a driving circuit.

[0009] Furthermore, the utility model can be implemented according to the following technical solution: the power input device includes a solar photovoltaic panel and a backup power supply.

[0010] Also included is a sampling circuit, the sampling circuit includes a resistor R2, a resistor R3, and a resistor R3 connected in series between the voltage input device and the input end of the switch-type DC / DC adjustable voltage module;

[0011] The resistor R1, the resistor R2 and the resistor R3 are all four-wire high-precision power resistors PBV-0.5%-0.01Ω.

[0012] It also includes a signal sorting module for sorting the signal obtained by the sampling circuit, and the signal sorting module includes: an input sorting circuit for sorting the signal sampled by the resistor R1 set between the voltage input port Vi_in+ and the voltage input port Vi_in-, an input sorting circuit for sorting the signal sampled by the resistor R2 set between the voltage input port Vo1_in+ and the voltage input port Vo1_in-, a 5V voltage output sorting circuit, and an adjustable voltage output sorting circuit for sorting the signal sampled by the resistor R3 set between the voltage input port Vo2_in+ and the voltage input port Vo2_in-;

[0013] The input voltage conditioning circuit includes an operational amplifier U701, wherein the voltage input port Vi_in+ is connected to the in-phase input terminal of the operational amplifier U701 through a resistor R701; the voltage input port Vi_in- is connected to the inverting input terminal of the operational amplifier U701 through a series resistor R702, and the other is connected to the output terminal of the operational amplifier U701 through a parallel circuit of a resistor R704 and a capacitor C702; the output terminal of the operational amplifier U701 is connected to the control and data processing module through a resistor R713; the in-phase input terminal of the operational amplifier U701 is grounded through a parallel circuit of a resistor R703 and a capacitor C701;

[0014] The 5V voltage output adjustment circuit includes an operational amplifier U702, wherein the voltage input port Vo1_in+ is connected to the in-phase input terminal of the operational amplifier U702 through a resistor R706; the voltage input port Vo1_in- is connected to the inverting input terminal of the operational amplifier U702 through a series resistor R705, and the other is connected to the output terminal of the operational amplifier U702 through a parallel circuit of a resistor R708 and a capacitor C706; the output terminal of the operational amplifier U702 is connected to the control and data processing module through a resistor R714; the in-phase input terminal of the operational amplifier U702 is grounded through a parallel circuit of a resistor R707 and a capacitor C705;

[0015] The adjustable voltage output adjustment circuit includes an operational amplifier U703, and the voltage input port Vo2_in+ is connected to the in-phase input terminal of the operational amplifier U703 through a resistor R710; the voltage input port Vo2_in- is connected to the inverting input terminal of the operational amplifier U703 through a series resistor R710, and the other path is connected to the output terminal of the operational amplifier U703 through a parallel circuit of a resistor R712 and a capacitor C702; the output terminal of the operational amplifier U703 is connected to the control and data processing module through a resistor R715; the in-phase input terminal of the operational amplifier U703 is grounded through a parallel circuit of a resistor R711 and a capacitor C709.

[0016] The voltage input port Vi_in+ is grounded after passing through resistors R716 and R717, and the port V_in1 between resistors R716 and R717 is connected to the control and data processing module; the voltage input port Vo1_in+ is grounded after passing through resistors R718 and R719, and the port V_in2 between resistors R718 and R719 is connected to the control and data processing module; the voltage input port Vo2_in+ is grounded after passing through resistors R720 and R721, and the port V_in2 between resistors R720 and R721 is connected to the control and data processing module.

[0017] Metal heat sinks are installed on the resistors R1 , R2 and R3 .

[0018] The display module includes a voltage display circuit, a current display circuit, a timing display circuit and a power / capacity display circuit.

[0019] The control and data processing module is also connected to the clock crystal oscillator and the interface circuit.

[0020] The utility model can not only charge mobile phones, tablets, laptops or other occasions that require different DC voltages, but also can be used in various power consumption occasions such as circuit maintenance power supply and battery capacity estimation, which well solves the problem of single function of existing products and improves the diversity and practicality of products. According to the diverse needs of outdoor users, the solar DC stable power supply includes adjustable DC voltage source output, 5V fixed voltage source output, voltage / current detection, etc., and also includes real-time power and output capacity calculation projects. Through these projects, it can provide a variety of power supplies for different outdoor customers, and also provide important data reference and basis for users' power output status detection and power estimation.

[0021] The utility model has the advantages of compact structure, small size, low cost, simple interface, and LED color display. It can display the current voltage value, current value, real-time power value and output power value in real time, and can be connected to the smart device through the interface to facilitate remote supervision and control.

[0022] The advantages of the utility model are as follows:

[0023] (1) The power supply of the utility model is an adjustable DC stable power supply which is provided with electric energy by outdoor solar photovoltaic panels. It not only has a fixed output voltage, but also has an adjustable DC output voltage. No matter where one is living in the wilderness, desert or ocean, as long as there is sunshine, it can provide sufficient and diverse power for various electronic devices anytime and anywhere.

[0024] (2) The real-time power display in the power supply of the utility model can greatly facilitate users to timely understand the working status of the solar photovoltaic panels outdoors and confirm the effectiveness of the equipment.

[0025] (3) The capacity accumulation technology in the power supply of the utility model can help users understand the total amount of power provided by the power supply to the electronic device after using the device for a certain period of time, and can also judge the capacity deviation of the battery in the subsequent electronic device.

[0026] (4) The current sampling circuit in the power supply of the utility model adopts a four-wire high-precision power resistor PBV-0.5%-0.01Ω, which can greatly expand the working environment temperature range of the equipment and ensure the linearity and accuracy of the current sampling signal in the range of 0A to 10A. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a principle block diagram of the utility model.

[0028] Figure 2 is a panel diagram of the display module.

[0029] Figure 3 It is a circuit diagram of a switching DC / DC adjustable voltage module and a sampling circuit.

[0030] Figure 4 Internal wiring diagram of four-wire high-precision power resistor.

[0031] Figure 5 Circuit diagram of the signal conditioning module.

[0032] Figure 6 Circuit diagram of the controller's working control and data processing modules.

[0033] Figure 7 Displays the circuit diagram of the module. DETAILED DESCRIPTION

[0034] The specific implementation methods of the present utility model are described below in conjunction with the accompanying drawings.

[0035] like Figure 1 As shown, the utility model of the multifunctional solar adjustable DC stable power supply includes a power input device, a main control device and a power output device. The main control device includes a switch type DC / DC adjustable voltage module, a control and data processing module, a drive circuit, an input module, a display module, a sampling circuit, a signal sorting module, a clock crystal oscillator and an interface circuit. The power input device includes a portable solar photovoltaic panel (solar cell package) and a backup power supply. The control and data processing module is connected to the input module and the display module through the drive circuit. The control and data processing module is also connected to the clock crystal oscillator and the interface circuit. The display module includes a voltage display circuit, a current display circuit, a timing display circuit and a power / capacity display circuit.

[0036] like Figure 2 As shown, the input end of the switch-type DC / DC adjustable voltage module is connected to the power input device through a switch; the switch-type DC / DC adjustable voltage module has two power output ends, one is a 5V voltage output after being connected in series with the resistor R2, and the other is an adjustable voltage output after being connected in series with the resistor R3. The clock end clk and the data input and output end data of the switch-type DC / DC adjustable voltage module are connected to the control and data processing module;

[0037] The sampling circuit is connected to the control and data processing module through the signal sorting module. The sampling circuit includes a resistor R2, a resistor R3, and a resistor R3 connected in series between the voltage input device and the input end of the switch type DC / DC adjustable voltage module. The resistors R1, R2 and R3 all use four-wire high-precision power resistors PBV-0.5%-0.01Ω. Metal heat sinks are installed on the resistors R1, R2 and R3.

[0038] like Figure 3 As shown, the output voltage of the solar photovoltaic panel or backup power supply is first input to the DC / DC adjustable voltage regulator module through resistor R1, and the input current sampling Vi is obtained from R1. The DC / DC adjustable voltage regulator module outputs two voltages, one is a fixed 5V voltage output, which is used as a charging or power supply port for common electronic devices such as mobile phones or tablets, and the other is an adjustable output, which is used as a power supply port for various electronic devices. Before the fixed voltage output and the adjustable voltage output, the output voltage and current are sampled through resistors R2 and R3 respectively, and the collected voltage differences are Vo1 and Vo2 respectively.

[0039] For sampling resistors, such devices used ordinary power resistors in the past, which are generally applicable to the temperature range of 0℃~+40℃. In order to ensure the accuracy and reliability of this device under outdoor hot conditions, we defined the temperature range of -30℃~+85℃ to improve and maintain the sampling accuracy. In terms of electrical design, four-wire high-precision power resistors PBV-0.5%-0.01Ω are used for resistors R1, R2 and R3. The operating temperature range of this device is -55℃~+125℃. The internal connections are as follows: Figure 4 As shown, the device has a four-wire structure. The two I terminals are current input and output terminals, the two V terminals are current sampling terminals, the two V terminals of the resistor R1 are connected to Vi_in- and Vi_in+ respectively, the two V terminals of the resistor R2 are connected to Vo1_in- and Vo1_in+ respectively, and the two V terminals of the resistor R3 are connected to Vo2_in+ and Vo2_in- respectively.

[0040] In order to ensure low temperature rise when working at high current, a metal heat sink is installed on the resistor to further increase the temperature range. This method can not only ensure the linearity and accuracy of the current sampling signal from 0A to 10A, but also greatly reduce the temperature drift of the sampling signal in the temperature range of -30℃ to +85℃.

[0041] like Figure 5 As shown, the signal sorting module sorts the signal obtained by the sampling circuit, and the signal sorting module includes: an input sorting circuit for sorting the signal sampled by the resistor R1 set between the voltage input port Vi_in+ and the voltage input port Vi_in-, an input sorting circuit 5V voltage output sorting circuit for sorting the signal sampled by the resistor R2 set between the voltage input port Vo1_in+ and the voltage input port Vo1_in-, and an adjustable voltage output sorting circuit for sorting the signal sampled by the resistor R3 set between the voltage input port Vo2_in+ and the voltage input port Vo2_in-.

[0042] The input voltage conditioning circuit includes an operational amplifier U701, and the voltage input port Vi_in+ is connected to the in-phase input terminal of the operational amplifier U701 through a resistor R701; the voltage input port Vi_in- is connected to the inverting input terminal of the operational amplifier U701 through a series resistor R702, and the other path is connected to the output terminal of the operational amplifier U701 through a parallel circuit of a resistor R704 and a capacitor C702; the output terminal of the operational amplifier U701 is connected to the analog input terminal of the control and data processing module through a resistor R713; the in-phase input terminal of the operational amplifier U701 is grounded through a parallel circuit of a resistor R703 and a capacitor C701.

[0043] The 5V voltage output adjustment circuit includes an operational amplifier U702, and the voltage input port Vo1_in+ is connected to the non-inverting input terminal of the operational amplifier U702 through a resistor R706; the voltage input port Vo1_in- is connected to the inverting input terminal of the operational amplifier U702 through a series resistor R705, and the other path is connected to the output terminal of the operational amplifier U702 through a parallel circuit of a resistor R708 and a capacitor C706; the output terminal of the operational amplifier U702 is connected to the analog input terminal of the control and data processing module through a resistor R714; the non-inverting input terminal of the operational amplifier U702 is grounded through a parallel circuit of a resistor R707 and a capacitor C705.

[0044] The adjustable voltage output adjustment circuit includes an operational amplifier U703, and the voltage input port Vo2_in+ is connected to the in-phase input terminal of the operational amplifier U703 through a resistor R710; the voltage input port Vo2_in- is connected to the inverting input terminal of the operational amplifier U703 through a series resistor R710, and the other path is connected to the output terminal of the operational amplifier U703 through a parallel circuit of a resistor R712 and a capacitor C702; the output terminal of the operational amplifier U703 is connected to the analog input terminal of the control and data processing module through a resistor R715; the in-phase input terminal of the operational amplifier U703 is grounded through a parallel circuit of a resistor R711 and a capacitor C709.

[0045] The Vi_in, Vo1_in and Vo2_in signals obtained by current sampling enter the signal sorting module. The current signal eliminates the common-mode signal through the operational amplifier (U701, U702 and U703) and amplifies the differential-mode signal. The sorted signals are L_in1, L_in2 and L_in3 respectively, and the signal value range is 0 to 2V.

[0046] The voltage sampling signals (Vi_in+, Vo1_in+ and Vo2_in+) are divided by resistors R716 to R721, and their output voltage signals are V_in1, V_in2 and V_in3 respectively. That is, the voltage input port Vi_in+ is grounded after passing through resistors R716 and R717, and the port V_in1 between resistors R716 and R717 is connected to the control and data processing module; the voltage input port Vo1_in+ is grounded after passing through resistors R718 and R719, and the port V_in2 between resistors R718 and R719 is connected to the control and data processing module; the voltage input port Vo2_in+ is grounded after passing through resistors R720 and R721, and the port V_in2 between resistors R720 and R721 is connected to the control and data processing module.

[0047] The above six sorted sampling signals (L_in1, L_in2, L_in3, V_in1, V_in2 and V_in3) are respectively input to the analog input terminals of the control and data processing modules ( Figure 6 U1 in the figure is used as the analog input signal for A / D conversion. These analog signals are converted into digital signals by a 12-bit A / D converter in the control and data processing module. After data calibration is performed inside the control and data processing module, their respective precise voltage and current values ​​are generated. Finally, these data are used to calculate power and electricity. The calculation method is shown in Formula 1 and Formula 2.

[0048] The real-time power is calculated as:

[0049] P=V×I (Formula 1)

[0050] The cumulative capacity is calculated as:

[0051]

[0052] Where: V is the output voltage value (unit V), I is the output current value (unit A), and t is the working time.

[0053] Since the voltage or current changes during charging or voltage stabilization, in order to ensure the accuracy of the calculation, the time t is calculated in seconds to integrate and accumulate the capacity.

[0054] like Figure 6 As shown, the control and data processing module can adopt conventional control and data processing modules. The main controller U1 chip of the control and data processing module in the utility model adopts STM32 series chips, with an external connection of 8MHz crystal, and an internal frequency multiplication of 9 times to achieve a main frequency of 72MHz. The integrated circuit U6 (AT24C02) is calibrated to store non-volatile data, mainly including the storage of working mode and calibration data. The real-time clock crystal oscillator Y101 adopts 32.768kHz, and after 15 times of frequency division by 2 in the controller, it outputs a 1s clock signal for the real-time clock to use as a sampling clock, timing time and accumulated capacity calculation, etc. Socket J1 is the programming and simulation port of the integrated circuit U1.

[0055] like Figure 7 As shown, the drive circuit, input module, and display module can adopt conventional modules or circuits that can realize drive, input and display functions. The display keyboard drive circuit of the utility model adopts the integrated circuit TM1628, which is a special circuit for LED drive control with a keyboard scanning interface. It supports up to 7-bit LED digital tubes and has 8 levels of brightness adjustment. It communicates with the controller through a serial interface (CLK, STB, DIO).

Claims

1. A multifunctional solar adjustable DC stable power supply, characterized in that: It includes a power input device, a main control device and a power output device; the main control device includes a switch-type DC / DC adjustable voltage module, a control and data processing module, a drive circuit, an input module, and a display module; it also includes a sampling circuit; The input end of the switch-type DC / DC adjustable voltage module is connected to the power input device through a switch; the switch-type DC / DC adjustable voltage module has two power output ends, one is a 5V voltage output connected in series with the resistor R2, and the other is an adjustable voltage output connected in series with the resistor R3; The clock terminal clk and the data input and output terminal data of the switch type DC / DC adjustable voltage module are connected to the control and data processing module; The sampling circuit is connected to the control and data processing module through the signal arrangement module; The control and data processing module is connected with the input module and the display module through a driving circuit.

2. The multifunctional solar adjustable DC stable power supply according to claim 1 is characterized in that: The power input device includes a solar photovoltaic panel and a backup power supply.

3. The multifunctional solar adjustable DC stable power supply according to claim 1 is characterized in that: The sampling circuit includes a resistor R2, a resistor R3, and a resistor R3 connected in series between the voltage input device and the input end of the switch-type DC / DC adjustable voltage module; The resistor R1, the resistor R2 and the resistor R3 are all four-wire high-precision power resistors PBV-0.5%-0.01Ω.

4. The multifunctional solar adjustable DC stable power supply according to claim 3 is characterized in that: It also includes a signal sorting module for sorting the signal obtained by the sampling circuit, and the signal sorting module includes: an input sorting circuit for sorting the signal sampled by the resistor R1 set between the voltage input port Vi_in+ and the voltage input port Vi_in-, an input sorting circuit for sorting the signal sampled by the resistor R2 set between the voltage input port Vo1_in+ and the voltage input port Vo1_in-, a 5V voltage output sorting circuit, and an adjustable voltage output sorting circuit for sorting the signal sampled by the resistor R3 set between the voltage input port Vo2_in+ and the voltage input port Vo2_in-; The input voltage conditioning circuit includes an operational amplifier U701, wherein the voltage input port Vi_in+ is connected to the in-phase input terminal of the operational amplifier U701 through a resistor R701; the voltage input port Vi_in- is connected to the inverting input terminal of the operational amplifier U701 through a series resistor R702, and the other is connected to the output terminal of the operational amplifier U701 through a parallel circuit of a resistor R704 and a capacitor C702; the output terminal of the operational amplifier U701 is connected to the control and data processing module through a resistor R713; the in-phase input terminal of the operational amplifier U701 is grounded through a parallel circuit of a resistor R703 and a capacitor C701; The 5V voltage output adjustment circuit includes an operational amplifier U702, wherein the voltage input port Vo1_in+ is connected to the in-phase input terminal of the operational amplifier U702 through a resistor R706; the voltage input port Vo1_in- is connected to the inverting input terminal of the operational amplifier U702 through a series resistor R705, and the other is connected to the output terminal of the operational amplifier U702 through a parallel circuit of a resistor R708 and a capacitor C706; the output terminal of the operational amplifier U702 is connected to the control and data processing module through a resistor R714; the in-phase input terminal of the operational amplifier U702 is grounded through a parallel circuit of a resistor R707 and a capacitor C705; The adjustable voltage output adjustment circuit includes an operational amplifier U703, and the voltage input port Vo2_in+ is connected to the in-phase input terminal of the operational amplifier U703 through a resistor R710; the voltage input port Vo2_in- is connected to the inverting input terminal of the operational amplifier U703 through a series resistor R710, and the other path is connected to the output terminal of the operational amplifier U703 through a parallel circuit of a resistor R712 and a capacitor C702; the output terminal of the operational amplifier U703 is connected to the control and data processing module through a resistor R715; the in-phase input terminal of the operational amplifier U703 is grounded through a parallel circuit of a resistor R711 and a capacitor C709.

5. The multifunctional solar adjustable DC stable power supply according to claim 4 is characterized in that: The voltage input port Vi_in+ is grounded after passing through resistors R716 and R717, and the port V_in1 between resistors R716 and R717 is connected to the control and data processing module; the voltage input port Vo1_in+ is grounded after passing through resistors R718 and R719, and the port V_in2 between resistors R718 and R719 is connected to the control and data processing module; the voltage input port Vo2_in+ is grounded after passing through resistors R720 and R721, and the port V_in2 between resistors R720 and R721 is connected to the control and data processing module.

6. The multifunctional solar adjustable DC stable power supply according to claim 1 is characterized in that: Metal heat sinks are installed on the resistors R1 , R2 and R3 .

7. The multifunctional solar adjustable DC stable power supply according to claim 1 is characterized in that: The display module includes a voltage display circuit, a current display circuit, a timing display circuit and a power / capacity display circuit.

8. The multifunctional solar adjustable DC stable power supply according to claim 1 is characterized in that: The control and data processing module is also connected to the clock crystal oscillator and the interface circuit.

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