Photovoltaic charging management device with weak light electricity taking function

Abstract

The utility model belongs to the technical field of photovoltaic charging, and particularly relates to a photovoltaic charging management device with a weak light electricity taking function. The device comprises a photovoltaic panel, a battery management unit, a weak light electricity taking unit, a monitoring unit and a battery, the photovoltaic panel is connected with the battery management unit and the weak light electricity taking unit, the battery management unit is connected with the monitoring unit and the battery, the monitoring unit is connected with the weak light electricity taking unit and the battery management unit, and the weak light electricity taking unit is connected with the battery. The utility model solves the problem that the equipment cannot be normally charged under the condition of weak light, which is easy to cause power shortage and offline of the equipment.

Description

Technical Field

[0001] This utility model belongs to the technical field of photovoltaic charging, and more specifically, it is a photovoltaic charging management device with weak light power extraction function. Background Technology

[0002] Currently, most transmission line equipment is powered by either current collectors (CTs) or photovoltaic (PV) power. CT power supply, because it is installed on the originally smooth busbars or contact arms, alters the electric field distribution, causing changes in insulation and dynamic / thermal stability; furthermore, live-line installation work at high voltage carries inherent risks. PV power supply is significantly affected by ambient light conditions, especially during prolonged periods of cloudy or rainy weather when sunlight is insufficient, preventing normal charging and potentially leading to equipment depletion or offline operation. Therefore, low-light charging functionality is crucial for ensuring long-term normal operation of equipment and safeguarding transmission line safety.

[0003] Chinese patent document CN210693542U discloses a low-light charging energy storage system and photovoltaic charging device with active balancing. The device includes a photovoltaic module, a supercapacitor, a charging circuit, a battery pack, and a DC-DC module. The photovoltaic module is connected to the supercapacitor, the supercapacitor is connected to the charging circuit, and the charging circuit is connected to the battery pack. The working principle of this patent is that, under low light conditions, the photovoltaic panel is disconnected from the subsequent circuitry, and only connected to the supercapacitor for charging and energy storage. However, when the supercapacitor voltage rises to equal the photovoltaic panel voltage, energy storage can no longer continue. This method has certain limitations; it cannot continuously store the photovoltaic panel's energy under low light conditions, and the energy that can be stored is relatively limited, failing to achieve continuous charging of the battery under low light conditions.

[0004] In view of this, this utility model designs a photovoltaic charging management device with low light power extraction function. Utility Model Content

[0005] The present invention aims to overcome at least one of the defects of the prior art and provide a photovoltaic charging management device with low light power extraction function to solve the problem that the device cannot be charged normally under low light conditions, which easily leads to the device losing power and going offline.

[0006] The detailed technical solution of this utility model is as follows:

[0007] A photovoltaic charging management device with low-light power extraction function, the device includes: a photovoltaic panel, a battery management unit, a low-light power extraction unit, a monitoring unit, and a battery; the photovoltaic panel is connected to the battery management unit and the low-light power extraction unit, the battery management unit is connected to the monitoring unit and the battery, the monitoring unit is connected to the low-light power extraction unit and the battery management unit, and the low-light power extraction unit is connected to the battery.

[0008] Preferably, the battery management unit includes a half-bridge drive circuit and a buck battery charging management circuit.

[0009] Preferably, the low-light power supply circuit includes: a power supply section, a U1 chip 5200, and a load section.

[0010] Preferably, the power supply section includes a power input VCC, a capacitor C1 connected between VCC and ground, a resistor R1, and a resistor R2.

[0011] Preferably, the U1 chip 5200 includes a fourth pin connected to the voltage divider point of R1 and R2, a second pin grounded, a fifth pin connected to the power supply VCC, a sixth pin connected to the inductor L1 and the diode D1, and a third pin connected to the resistors R3 and R4.

[0012] Preferably, the load is a battery connected via diode D2, and C3 is a filter capacitor.

[0013] Preferably, resistors R1 and R2 are connected in series between VCC and ground to form a voltage divider circuit, and the connection point of resistors R1 and R2 is connected to the enable terminal EN1 of chip U1.

[0014] Preferably, the monitoring unit includes: a control chip U2, a transistor Q1, a diode D3, resistors R5, R6, R7, R8, and a capacitor C2;

[0015] Preferably, the control chip U2 includes a grounded pin 7, an 8 pin connected to transistor Q1, and a 9 pin connected to the power supply; R7 and capacitor C2 together form an RC circuit, and R6 is connected to transistor Q1.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention provides a photovoltaic charging management device with low-light power extraction function, which has functions such as photovoltaic charging, battery management, and low-light power extraction. It also boasts advantages such as high efficiency, low cost, and simple control, meeting the needs of power transmission products for new energy power supply methods. It solves the problems of high cost and complex control in existing integrated solutions, as well as the inability of low-cost solutions to achieve charging under low-light conditions. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the photovoltaic charging management device described in this utility model.

[0019] Figure 2 This is the circuit diagram of the low-light power extraction unit described in this utility model.

[0020] Figure 3This is the circuit diagram of the monitoring unit described in this utility model. Detailed Implementation

[0021] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Where there is no conflict, the embodiments and features described herein can be combined with each other.

[0025] The following describes a photovoltaic charging management device with low-light power generation function according to specific embodiments.

[0026] Example 1

[0027] This embodiment provides a photovoltaic charging management device with low-light power extraction function, such as... Figure 1 As shown, the device includes: a photovoltaic panel, a battery management unit, a low-light power extraction unit, a monitoring unit, and a battery; after the photovoltaic panel converts solar energy into electrical energy, the battery management unit charges the battery, detects the voltage, and controls the charging current; the monitoring unit controls the low-light power extraction unit to work in low-light conditions based on the battery status and the magnitude of the photovoltaic voltage.

[0028] The photovoltaic panel is connected to the battery management unit and the low-light power collection unit, and is mainly responsible for converting solar energy into electrical energy. Different power and model photovoltaic panels can be adapted according to the actual situation such as equipment power consumption and working environment.

[0029] The battery management unit is connected to the monitoring unit and the battery. The battery management unit includes a half-bridge drive circuit and a buck-type battery charging management circuit. The synchronous buck circuit eliminates the need for a freewheeling diode, solving the temperature rise and power consumption problems of asynchronous buck circuits and improving charging efficiency. It features maximum power point tracking, overvoltage protection, undervoltage protection, overcurrent protection, and constant voltage / constant current charging functions. It provides photovoltaic charging management and charging protection for the battery.

[0030] The monitoring unit is connected to the low-light power supply unit and the battery management unit, and mainly realizes the acquisition of voltage and the control of the battery management unit and the low-light power supply unit. It controls the operation of relevant circuits according to different lighting conditions.

[0031] The low-light power unit is connected to the battery. When the device is in a low-light environment, the low-light power supply operates, using a DC-DC converter to charge the battery with a small current / low power, enabling battery charging and management under low-light conditions.

[0032] like Figure 2 As shown, the low-light power supply unit includes: a power supply section, a U1 chip 5200, and a load section. The power supply section includes a power input VCC, a capacitor C1 connected between VCC and ground, a resistor R1, and a resistor R2. The resistors R1 and R2 are connected in series between VCC and ground to form a voltage divider circuit. The connection point of the resistors R1 and R2 is connected to the enable terminal EN1 of the chip U1. The U1 chip 5200 includes a 4th pin connected to the voltage divider point of R1 and R2, a 2nd pin grounded, a 5th pin connected to the power supply VCC, a 6th pin connected to the inductor L1 and the diode D1, and a 3rd pin connected to the resistors R3 and R4. The load section is a battery connected through a diode D2, and C3 is a filter capacitor. When there is weak light, the power supply VCC provides electrical energy. Through the voltage division of resistors R1 and R2, the enable terminal EN1 of control chip U1 is activated, determining whether the chip operates. U1 drives the circuit through PWM on pin 6 and feedback voltage on pin 3, dynamically adjusting the output voltage, including inductor L1 and resistors R3 and R4. Inductor L1 acts as an energy storage and filter in the circuit, forming a power loop with freewheeling diode D1. Diode D2 prevents reverse current and overvoltage. Resistors R3 and R4 are used for output voltage feedback sampling, and capacitor C3 is used for output filtering.

[0033] like Figure 3 As shown, the monitoring unit mainly realizes the acquisition of voltage and the control of the battery management unit and the low light power supply unit. According to different lighting conditions, it controls the operation of related circuits, including: control chip U2, transistor Q1, diode D3, resistors R5, R6, R7, R8 and capacitor C2; the control chip U2 includes a grounded pin 7, an 8 connected to transistor Q1, and a 9 connected to the power supply; R7 and capacitor C2 may form an RC circuit, and R6 is connected to transistor Q1.

Claims

1. A photovoltaic charging management device with low-light power extraction function, characterized in that, The device includes: a photovoltaic panel, a battery management unit, a low-light power extraction unit, a monitoring unit, and a battery; the photovoltaic panel is connected to the battery management unit and the low-light power extraction unit, the battery management unit is connected to the monitoring unit and the battery, the monitoring unit is connected to the low-light power extraction unit and the battery management unit, and the low-light power extraction unit is connected to the battery.

2. A photovoltaic charging management device with low-light power extraction function according to claim 1, characterized in that, The battery management unit includes a half-bridge drive circuit and a buck battery charging management circuit.

3. A photovoltaic charging management device with low-light power extraction function according to claim 1, characterized in that, The low-light power supply unit includes: a power supply section, a U1 chip 5200, and a load section.

4. A photovoltaic charging management device with low-light power extraction function according to claim 3, characterized in that... The power supply section includes a power input VCC, a capacitor C1 connected between VCC and ground, a resistor R1, and a resistor R2.

5. A photovoltaic charging management device with low-light power extraction function according to claim 4, characterized in that... The U1 chip 5200 includes a 4th pin connected to the voltage divider point of R1 and R2, a 2nd pin grounded, a 5th pin connected to the power supply VCC, a 6th pin connected to the inductor L1 and the diode D1, and a 3rd pin connected to the resistors R3 and R4.

6. A photovoltaic charging management device with low-light power extraction function according to claim 5, characterized in that... The load component is a battery, connected via diode D2, and C3 is a filter capacitor.

7. A photovoltaic charging management device with low-light power extraction function according to claim 4, characterized in that, The resistors R1 and R2 are connected in series between VCC and ground to form a voltage divider circuit. The connection point of resistors R1 and R2 is connected to the enable terminal EN1 of chip U1.

8. A photovoltaic charging management device with low-light power extraction function according to claim 1, characterized in that, The monitoring unit includes: a control chip U2, a transistor Q1, a diode D3, resistors R5, R6, R7, and R8, and a capacitor C2.

9. A photovoltaic charging management device with low-light power extraction function according to claim 8, characterized in that, The control chip U2 includes a grounded pin 7, an 8 connected to transistor Q1, and a 9 connected to the power supply; R7 and capacitor C2 together form an RC circuit, and R6 is connected to transistor Q1.

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