MPPT charging and discharging controller with low voltage input

Abstract

The utility model discloses an MPPT charging and discharging controller with low voltage input. The MPPT charging and discharging controller comprises a central controller, a charging module, a power supply module, a Bluetooth module, a power management module and a boost constant current module, different input terminals of the central controller are respectively connected to the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module for data acquisition, and different output terminals of the central controller are respectively connected with control terminals of the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module for data acquisition. And controlling the working mode of the module. A plurality of multi-bit analog-digital conversion channels are arranged in the central controller and used for executing analog-digital conversion on input signals detected by different input terminals of the central controller.

Description

Technical Field

[0001] The utility model relates to the technical field of charge and discharge control, in particular to an MPPT charge and discharge controller with low voltage input. Background Art

[0002] With the depletion of fossil energy as the main energy source and the increasing attention to environmental protection caused by global warming, coupled with the shortcomings of old-style mains street lights such as huge cost, low energy utilization and difficult maintenance and management, the pollution-free new energy solar street lights have gradually come into people's sight and gradually grown.

[0003] Solar street lights use nearly endless sunlight to convert into electrical energy, eliminating the need for costly and difficult-to-maintain cable laying construction. In addition, they are easy to control, easy to implement as a single unit, easy to control individually or centrally, and can intelligently control brightness at different times to save energy. As technology develops, conversion efficiency can be improved, and as output and the number of applications increase, production costs can be reduced. Solar street lights will occupy most of the space for street lights in the foreseeable future, which is a clear development direction.

[0004] However, there are still some problems with the solar street lights commonly used in the market, mainly in the following aspects: insufficient power supply for street lights due to insufficient power generation caused by weather or shading; battery technology limits service life and number of charging cycles; single brightness drive causes meaningless waste of electricity during periods when high brightness is not required, etc. Utility Model Content

[0005] The purpose of the utility model is to provide a low voltage input MPPT charge and discharge controller, the charge and discharge controller comprises: a central controller, a charging module, a power supply module, a Bluetooth module, a power management module and a boost constant current module;

[0006] The different input terminals of the central controller are respectively connected to the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module for data acquisition, and the different output terminals of the central controller are respectively connected to the control terminals of the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module to control the working mode of the module.

[0007] As provided by the utility model, the charge and discharge controller has a plurality of multi-bit analog-to-digital conversion channels arranged in the central controller, which are used to perform analog-to-digital conversion on input signals detected by different input terminals of the central controller;

[0008] The input signal includes: electrical information of the input end of the charging module, electrical information of the output end of the charging module, electrical information of the output end of the power supply module and electrical information of the output end of the boost constant current module;

[0009] The electrical information can include: voltage and current.

[0010] As provided by the utility model, the different input ends of the power supply module are respectively connected to the battery and the external power supply, and the electric energy of the battery or the external power supply is converted to generate different power supply voltages and then supplied to the central controller, Bluetooth module and power management module; the conversion process includes: rectification, power factor adjustment, voltage shaping, voltage stabilization and power supply filtering.

[0011] As provided by the utility model, the battery includes: lead battery, lithium battery, nickel battery, silver battery and sodium battery; the external power supply includes: solar cell, wind generator and mains power supply.

[0012] As provided by the utility model, the input end of the charging module is connected to an external power supply, and the output end of the charging module is connected to a storage battery;

[0013] The central controller collects and processes the electrical information of the battery and the external power supply at the same time, and generates different charging mode control signals through the internal program of the central controller to operate the charging module to start the corresponding battery charging mode;

[0014] The electrical information can include: voltage and current.

[0015] As in the charge and discharge controller provided by the present invention, the power management module is composed of internal units of the central controller; the power management module collects voltage and current information of the battery, power load and external power supply, and generates corresponding battery charging mode and load driving mode through software processing.

[0016] As for the charge and discharge controller provided by the utility model, the battery management module includes: a voltage sampling circuit, an overcurrent and overvoltage protection circuit, and an indicator light circuit.

[0017] As in the charge and discharge controller provided by the present invention, the input end of the boost constant current module is connected to the battery, and the voltage of the battery is boosted to a voltage value suitable for use by the power load according to the control instruction of the central controller.

[0018] As for the charge and discharge controller provided by the present invention, the power load is a street lamp, and the control instructions of the central controller include: lighting or extinguishing the street lamp, and adjusting the brightness of the street lamp.

[0019] As for the charge and discharge controller provided by the utility model, the Bluetooth module executes wireless communication between the charge and discharge controller and the remote computer, and transmits the information transmitted via Bluetooth to the central controller. The central controller parses and processes the transmitted information, generates control information to control the charge and discharge controller or edits a response information frame to answer the remote computer via the Bluetooth module.

[0020] The utility model has the following advantages: 1. It adopts BLE 5.0Mesh technology to achieve low-cost, low-power, high-reliability, and strong anti-interference communication effects;

[0021] 2.MPPT has high charging efficiency and can maintain normal operation under less light;

[0022] 3. It has strong adaptability to terrain and can be installed in places with proper lighting, without being affected by infrastructure such as power lines;

[0023] 4. With open circuit protection, short circuit protection and other functions to protect safety;

[0024] 5. Protection grade IP67, can be used in outdoor dry / humid / thunderstorm environment;

[0025] 6. Applicable to 3.2V system, the output voltage is boosted to about 9V~30V, and the power is greater than 50W;

[0026] 7. Intelligent control mode, suitable for lithium batteries or sodium batteries, can automatically adjust the charging and discharging strategy according to the battery condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The circuit principle block diagram of the utility model;

[0028] Figure 2 The electrical schematic diagram of the central controller used in the embodiment of the utility model;

[0029] Figure 3 Electrical schematic diagram of a voltage-boosting constant-current module according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] The utility model adopts a maximum power point tracking (MPPT) charging controller which is developed based on eliminating or reducing the shortcomings of existing solar street lamps.

[0031] The new MPPT charging controller uses wireless Bluetooth as a channel, and can control the cluster or set the working mode of a single individual, which is convenient for management and maintenance; it uses a high-performance MCU as the core to optimize the management of its own equipment; it uses a new charging and discharging theory as a basis to improve the service life of existing batteries and the utilization rate of small electric energy under weak light; it relies on efficient software algorithms to complete functions such as status detection, information interaction, and brightness conversion. Combined with this, before the new battery and solar panel technology and products are put into use, the efficiency and product life cycle of the existing hardware platform have been greatly improved.

[0032] The preferred embodiments of the present invention will be described in detail below in conjunction with the examples. It should be understood that the following examples are provided only for the purpose of illustration and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various modifications and substitutions to the present invention without departing from the purpose and spirit of the present invention, and all of these modifications and substitutions fall within the scope of protection claimed in the claims of the present invention.

[0033] The purpose of the utility model is to provide a low voltage input MPPT charge and discharge controller, the charge and discharge controller comprises: a central controller, a charging module, a power supply module, a Bluetooth module, a power management module and a boost constant current module;

[0034] The different input terminals of the central controller are respectively connected to the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module for data acquisition. Under the control of the embedded program, the working modes of the five modules are controlled. The different output terminals of the central controller are respectively connected to the control terminals of the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module to control the working modes of the modules.

[0035] As provided by the utility model, the central controller is provided with a plurality of multi-bit analog-to-digital conversion channels for performing analog-to-digital conversion on the input signals detected by different input terminals of the central controller; the input signals include: the input electrical information of the charging module, the output electrical information of the charging module, the output electrical information of the power supply module and the output electrical information of the boost constant current module; the electrical information can include: voltage and current. Figure 1 Is the electrical principle block diagram of the utility model

[0036] Example:

[0037] like Figure 2 As shown, the central controller is the core of the charging controller, with STM32F030C8 as the main chip, collecting information from other modules, and controlling the working mode of each module under the control of the internal program of the central controller.

[0038] As provided by the utility model, the different input ends of the power supply module are respectively connected to the battery and the external power supply, and the electric energy of the battery or the external power supply is converted to generate different power supply voltages and then supplied to the central controller, Bluetooth module and power management module; the conversion process includes: rectification, power factor adjustment, voltage shaping, voltage stabilization and power supply filtering.

[0039] As provided by the utility model, the battery includes: lead battery, lithium battery, nickel battery, silver battery and sodium battery; the external power supply includes: solar cell, wind generator and mains power supply.

[0040] As provided by the utility model, the input end of the charging module is connected to an external power supply, and the output end of the charging module is connected to a storage battery;

[0041] The central controller collects and processes the electrical information of the battery and the external power supply at the same time. The internal program of the central controller generates different charging mode control signals to operate the charging module to start the corresponding battery charging mode. The charging module feeds back the electrical information from the solar panel to the central controller after protection processing. The central controller also collects and processes the battery status information such as voltage, current, temperature, etc., makes different charging mode decisions under the control of the program, and controls the module to start the corresponding charging mode to achieve effective compatibility between charging and protecting battery life.

[0042] As in the charge and discharge controller provided by the present invention, the power management module is composed of internal units of the central controller; the power management module collects voltage and current information of the battery, power load and external power supply, and generates corresponding battery charging mode and load driving mode through software processing.

[0043] As for the charge and discharge controller provided by the utility model, the battery management module includes: voltage sampling circuit, overcurrent and overvoltage protection circuit, indicator light circuit. The power management module collects equipment voltage information such as battery voltage, load street lamp voltage, solar power supply panel voltage, etc. in real time, and controls the switch of special power supply when needed.

[0044] As in the charge and discharge controller provided by the present invention, the input end of the boost constant current module is connected to the battery, and the voltage of the battery is boosted to a voltage value suitable for use by the power load according to the control instruction of the central controller.

[0045] As for the charge and discharge controller provided by the present invention, the power load is a street lamp, and the control instructions of the central controller include: lighting or extinguishing the street lamp, and adjusting the brightness of the street lamp.

[0046] The boost constant current module of the utility model embodiment includes a boost circuit and a constant current control circuit, as shown in the attached Figure 3 As shown, the positive electrode of the battery and the positive electrode of the load street lamp are connected through a boost circuit, the boost circuit includes a winding inductor L4, two boost MOS tubes Q7 and Q15, and three output filter capacitors C23, C50 and C51. The constant current control circuit includes a driver chip U4, a loop current detection resistor R60 and an operational amplifier. The central controller controls the driver chip LM5109 to generate a boost drive signal to adjust the boost MOS tubes Q7 and Q15 according to the voltage of the load street lamp, and generates a pulse modulation signal to adjust the boost MOS tubes Q7 and Q15 according to the current value detected by the loop current detection resistor R60. The operational amplifier is used to amplify the current value detected by the loop current detection resistor.

[0047] In this embodiment, the main control chip MCU of the Bluetooth solar street light controller integrates the Bluetooth communication part, and the single-chip microcomputer STM32F030C8 chip is used as the main chip to implement system voltage sampling and import it into the control algorithm for calculation. The real-time parameters of the controller can be viewed through the mobile phone APP, and the working mode and working parameters of the controller can be set.

[0048] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A low voltage input MPPT charge and discharge controller, characterized in that: The charge and discharge controller includes: a central controller, a charging module, a power supply module, a Bluetooth module, a power management module and a boost constant current module; Different input terminals of the central controller are respectively connected to the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module for data collection, and different output terminals of the central controller are respectively connected to the control terminals of the charging module, the power supply module, the Bluetooth module, the power management module and the boost constant current module to control the working mode of the module; Different input ends of the power supply module are connected to the battery and the external power supply respectively, and the electric energy of the battery or the external power supply is converted and processed to generate different power supply voltages and then supplied to the central controller, the Bluetooth module and the power management module; the conversion process includes: rectification, power factor adjustment, voltage shaping, voltage stabilization and power supply filtering; The input end of the charging module is connected to an external power supply, and the output end of the charging module is connected to a storage battery.

2. The charge and discharge controller according to claim 1, characterized in that: A plurality of multi-bit analog-to-digital conversion channels are provided in the central controller for performing analog-to-digital conversion on input signals detected by different input terminals of the central controller; The input signal includes: electrical information of the input end of the charging module, electrical information of the output end of the charging module, electrical information of the output end of the power supply module and electrical information of the output end of the boost constant current module; The electrical information can include: voltage and current.

3. The charge and discharge controller according to claim 1, characterized in that: The storage battery includes: lead storage battery, lithium storage battery, nickel storage battery, silver storage battery and sodium storage battery; the external power supply includes: solar cell, wind power generator and mains power supply.

4. The charge and discharge controller according to claim 2, characterized in that: The central controller collects and processes the electrical information of the battery and the external power supply at the same time, and generates different charging mode control signals through the internal program of the central controller to operate the charging module to start the corresponding battery charging mode; The electrical information can include: voltage and current.

5. The charge and discharge controller according to claim 2, characterized in that: The power management module is composed of internal units of the central controller; the power management module collects voltage and current information of the battery, power load and external power supply, and generates corresponding battery charging mode and load driving mode through software processing.

6. The charge and discharge controller according to claim 5, characterized in that: The battery management module includes: a voltage sampling circuit, an overcurrent and overvoltage protection circuit, and an indicator light circuit.

7. The charge and discharge controller according to claim 2, characterized in that: The input end of the boost constant current module is connected to the battery, and the voltage of the battery is boosted to a voltage value suitable for use by the power load according to the control instruction of the central controller.

8. The charge and discharge controller according to claim 7, characterized in that: The power load is a street lamp, and the control instructions of the central controller include: lighting or extinguishing the street lamp, and adjusting the brightness of the street lamp.

9. The charge and discharge controller according to claim 2, characterized in that: The Bluetooth module performs wireless communication between the charge and discharge controller and the remote computer, and transmits the information transmitted via Bluetooth to the central controller. The central controller parses and processes the transmitted information, generates control information to control the charge and discharge controller or edits a response information frame to answer the remote computer via the Bluetooth module.

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