Solar panel power supply circuit applied to monitoring camera

Abstract

The utility model relates to a solar panel power supply circuit applied to a monitoring camera, which comprises a solar panel, a charging management circuit, a booster circuit, a voltage stabilizing circuit and a battery, the solar panel is electrically connected with the charging management circuit through a USB interface, a first path of the charging management circuit is electrically connected with the booster circuit after the charging management circuit is connected with a current detection circuit in series, and a second path of the charging management circuit is electrically connected with the voltage stabilizing circuit. A second path after the charging management circuit is connected in series with the current detection circuit is electrically connected with the battery, the booster circuit is electrically connected with the voltage stabilizing circuit, a third path after the charging management circuit is connected in series with the current detection circuit serves as a first detection path to be electrically connected with the load, and the charging management circuit is provided with a second detection path to be electrically connected with the load. And the first detection circuit and the second detection circuit form a voltage detection circuit for the current detection circuit. The utility model can monitor the electric quantity of the battery and the output power of the solar panel, prolong the working time of the load, improve the utilization rate of solar energy and prolong the service life of the battery.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, and in particular to a power supply circuit for solar panels used in surveillance cameras. Background Technology

[0002] Currently, in the IPC (Internet Protocol Camera) industry, solar-powered products typically include a USB power interface and a lithium battery. The solar panel's power output is via USB, which first charges the lithium battery, which then powers the system. When the battery level is above 30%, it operates in intelligent power-saving mode, and the IPC records 24 / 7, resulting in high power consumption. When the battery level is below 30%, it enters super power-saving mode. This technical solution has several drawbacks: First, in low-light conditions like cloudy days, the super power-saving mode only activates when the battery level drops to 30%, failing to constantly monitor the solar panel's output power and thus preventing earlier activation to extend battery life. Second, in low-light conditions, when the battery is depleted, insufficient battery power causes the camera system to repeatedly restart, wasting solar energy and resulting in low solar energy utilization. Third, the repeated system restarts at low battery levels and frequent battery charging and discharging pose a risk of reduced lithium battery life. Therefore, a circuit structure capable of continuous monitoring and extended battery life is needed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a solar panel power supply circuit for surveillance cameras, which addresses the shortcomings of the prior art and solves the problems of continuous monitoring and short battery life in the prior art.

[0004] This utility model embodiment provides a solar panel power supply circuit for a surveillance camera, comprising: a solar panel, a charging management circuit, a boost circuit, a voltage regulator circuit, and a battery. The solar panel is electrically connected to the charging management circuit via a USB interface. A first path of the charging management circuit after connecting a current detection circuit in series is electrically connected to the boost circuit. A second path of the charging management circuit after connecting the current detection circuit in series is electrically connected to the battery. The boost circuit is electrically connected to the voltage regulator circuit. A third path of the charging management circuit after connecting the current detection circuit in series serves as a first detection path and is electrically connected to the load. The charging management circuit has a second detection path and is electrically connected to the load. The first and second detection paths form a voltage detection circuit for the current detection circuit. The second detection path is used to detect the battery voltage. The voltage detection circuit feeds back to the charging management circuit. The output terminal of the voltage regulator circuit serves as the power supply terminal for the load.

[0005] In some embodiments, the current sensing circuit is a sensing resistor.

[0006] In some embodiments, the charging management circuit is electrically connected to a charging indicator circuit.

[0007] In some embodiments, a filter circuit is electrically connected between the solar panel and the charging management circuit.

[0008] In some embodiments, the first detection path is electrically connected to a filter circuit.

[0009] In some embodiments, the second detection path is electrically connected to another filtering circuit.

[0010] In some embodiments, the charging management circuit is electrically linked to the load via a switching circuit.

[0011] In some embodiments, the switching circuit includes a switching transistor, the control terminal of which is electrically connected to the load, the input terminal of which is electrically connected to the charging management circuit, and the output terminal of which is grounded.

[0012] In some embodiments, the charging management circuit is connected in series with the temperature sensing circuit and electrically connected to the battery.

[0013] In some embodiments, the charging management circuit is electrically connected to the boost circuit via a feedback switching circuit.

[0014] Compared to related technologies, the solar panel power supply circuit for surveillance cameras provided in this embodiment includes: a solar panel, a charging management circuit, a boost circuit, a voltage regulator circuit, and a battery. The solar panel is electrically connected to the charging management circuit via a USB interface. The first path of the charging management circuit, after connecting a current detection circuit in series, is electrically connected to the boost circuit. The second path of the charging management circuit, after connecting a current detection circuit in series, is electrically connected to the battery. The boost circuit and the voltage regulator circuit are electrically connected. The third path of the charging management circuit, after connecting a current detection circuit in series, serves as the first detection path and is electrically connected to the load. The charging management circuit has a second detection path and is electrically connected to the complex circuit. The first and second detection paths form a voltage detection circuit for the current detection circuit. The second detection path is used to detect the battery voltage. The voltage detection circuit feeds back to the charging management circuit. The output terminal of the voltage regulator circuit serves as the power supply terminal for the load. This invention can monitor battery power and solar panel output power, extend the working time of the load, improve solar energy utilization, and extend battery life.

[0015] Details of one or more embodiments of the present invention are set forth in the following drawings and description, so that other features, objects and advantages of the present invention will be more readily understood. Attached Figure Description

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 This is an overall schematic diagram of an embodiment of the present utility model.

[0018] Figure 2 This is a circuit diagram of the USB interface circuit according to an embodiment of the present invention.

[0019] Figure 3 This is a circuit diagram of the USB insertion detection circuit according to an embodiment of the present invention.

[0020] Figure 4 This is a circuit diagram of the charging management circuit and the indicator light circuit and battery interface circuit electrically connected thereto, according to an embodiment of this utility model.

[0021] Figure 5 This is a circuit diagram of the boost circuit according to an embodiment of the present invention.

[0022] Figure 6 This is a circuit diagram of the load connection circuit according to an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments provided by this utility model without inventive effort are within the scope of protection of this utility model. Furthermore, it can be understood that although the efforts made in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this utility model, some design, manufacturing, or production modifications based on the technical content disclosed in this utility model are merely conventional technical means and should not be construed as insufficient disclosure of the present utility model.

[0024] In this utility model, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this utility model. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this utility model may be combined with other embodiments without conflict.

[0025] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "a," "an," "an," "the," and similar words used in this utility model do not indicate quantity limitation and may indicate singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this utility model are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms "connected," "linked," "coupled," and similar words used in this utility model are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "A plurality" used in this utility model means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The terms "first," "second," and "third" involved in this utility model are only used to distinguish similar objects and do not represent a specific ordering of objects.

[0026] like Figure 1-6The embodiment shown in this utility model provides a solar panel power supply circuit for a surveillance camera, comprising: a solar panel, a charging management circuit, a boost circuit, a voltage regulator circuit, and a battery. The solar panel is electrically connected to the charging management circuit via a USB interface. A first path of the charging management circuit after connecting a current detection circuit in series is electrically connected to the boost circuit. A second path of the charging management circuit after connecting the current detection circuit in series is electrically connected to the battery. The boost circuit is electrically connected to the voltage regulator circuit. A third path of the charging management circuit after connecting the current detection circuit in series serves as a first detection path and is electrically connected to the load. The charging management circuit has a second detection path and is electrically connected to the load. The first and second detection paths form a voltage detection circuit for the current detection circuit. The second detection path is used to detect the battery voltage. The voltage detection circuit feeds back to the charging management circuit. The output terminal of the voltage regulator circuit serves as the power supply terminal for the load. The USB interface uses a Type-C interface to power the charging management circuit via the solar panel. As shown in the diagram, the Type-C interface chip J1 outputs 5V, which is then filtered by capacitors C16 and C42 connected in parallel before being supplied to the charging management circuit. The charging management circuit U3 uses an ME4066 chip. Its IN pin is connected to the 5V output terminal of the USB interface after filtering by multiple sets of capacitors connected in parallel to obtain the operating voltage. Its SW pin is filtered by LC and connected to the BAT pin, with a current sensing resistor R31 connected in series to serve as the output voltage terminal VBAT. The first detection path GPIO1 is formed by connecting a current-limiting resistor in series before the current sensing resistor R31 in the pre-stage circuit of the output voltage terminal VBAT. The second detection path GPIO2 is formed by connecting a resistor between the output voltage terminal VBAT and the current sensing resistor R31. The boost circuit U9 uses an HT718SPER chip. Its EN pin serves as the VBAT_IN terminal, electrically connected to the battery, and powered by the battery when there is no sunlight. The voltage regulator circuit uses a 5V to 3.3V regulator chip, such as the SD8904 chip, etc., which will not be described in detail here.

[0027] In this embodiment, the current detection circuit is a current detection resistor R31. By using a detection resistor as the current detection circuit, the current flowing through the circuit can be accurately measured, thereby enabling monitoring and control of the charging process and improving charging safety and efficiency. By setting the first detection path GPIO1 and the second detection path GPIO2 to not sleep mode, continuous monitoring of the voltage across the current detection resistor R31 is achieved. When the voltage across the current detection resistor is detected to be less than a threshold, feedback is sent to the charging management chip to charge the battery. The second detection path GPIO2 is used to detect the battery's charge level. Both of these functions are implemented based on the hardware of the circuit structure in this embodiment.

[0028] In this embodiment, the charging management circuit is electrically connected to a charging indicator light circuit D30. The charging indicator light circuit D30 is connected in series with a current-limiting resistor and then electrically connected to the CHRG pin of the charging management chip U3. The charging indicator light circuit provides users with intuitive charging status feedback. Through the changes in the indicator light, users can easily understand the charging progress and status of the battery.

[0029] In this embodiment, a filter circuit (capacitors C36, C39, and C40 connected in parallel and grounded) is electrically connected between the solar panel and the charging management circuit. The introduction of the filter circuit can reduce the fluctuation and noise of the solar panel output, provide a more stable power input, and protect the charging management circuit from the influence of transient voltages.

[0030] In this embodiment, the first detection path is electrically connected to a filter circuit (capacitor C37). The second detection path is electrically connected to another filter circuit (capacitors C38 and C222 connected in parallel). By adding filter circuits to the detection paths, the detected voltage signal can be ensured to be more stable and accurate, thus improving the reliability and stability of the entire circuit.

[0031] In this embodiment, the charging management circuit is electrically connected to the load via a switching circuit. The switching circuit includes a switching transistor Q10, the control terminal of which is electrically connected to the load, the input terminal of which is electrically connected to the charging management circuit, and the output terminal of which is grounded. The switching transistor enables feedback control of the charging management circuit by the load.

[0032] In this embodiment, the charging management circuit is electrically connected to the battery in series with a temperature sensing circuit. The use of the temperature sensing circuit allows the system to monitor the battery temperature, preventing overheating and thus protecting the battery and extending its lifespan. The temperature sensing circuit includes an NTC resistor.

[0033] In this embodiment, the charging management circuit is electrically connected to the boost circuit via a feedback switch circuit. The use of the feedback switch circuit allows the system to adjust the operating state of the boost circuit based on the feedback signal of the output voltage, maintaining a stable output voltage and improving the stability and reliability of the system.

[0034] The charging management chip allows the charging current to be adjusted via external circuitry, up to 2A. The load is detected by an insertion detection circuit (such as...). Figure 3The USB_VBUS I / O pin (as shown) is used to determine if a USB cable is plugged in. An indicator light shows whether the battery is currently charging or fully charged. When a lithium battery is charging, its voltage can be artificially high, leading to inaccurate voltage detection. Therefore, when reading the battery level, the CHAR_CE control signal is used to deactivate the charging state, and then the second detection path GPIO2 is used to read the battery voltage and obtain the current percentage. The load intelligently detects the solar power output to determine which intelligent power-saving mode to enter: On the power board, the load detects the voltage across the charging current detection resistor via the first detection path GPIO1 and the second detection path GPIO2. Based on Ohm's law, it determines the current output power of the charging management chip. The second detection path GPIO2 is used to read the battery voltage and obtain the current percentage, thus determining the current battery level. The load in this embodiment can be a processor chip containing a battery management SOC system, or a programmable chip such as a microcontroller or PLC.

[0035] The working principle of this utility model embodiment is as follows: The solar panel power supply circuit for surveillance cameras provided by this utility model embodiment includes: a solar panel, a charging management circuit, a boost circuit, a voltage regulator circuit, and a battery. The solar panel is electrically connected to the charging management circuit via a USB interface. The first path of the charging management circuit after connecting a current detection circuit in series is electrically connected to the boost circuit. The second path of the charging management circuit after connecting a current detection circuit in series is electrically connected to the battery. The boost circuit is electrically connected to the voltage regulator circuit. The third path of the charging management circuit after connecting a current detection circuit in series serves as the first detection path and is electrically connected to the load. The charging management circuit has a second detection path and is electrically connected to the complex circuit. The first and second detection paths form a voltage detection circuit for the current detection circuit. The second detection path is used to detect the battery voltage. The voltage detection circuit feeds back to the charging management circuit. The output terminal of the voltage regulator circuit serves as the power supply terminal for the load. This utility model can monitor the battery charge and the output power of the solar panel, extend the working time of the load, improve the utilization rate of solar energy, and extend battery life.

[0036] Those skilled in the art should understand that the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A solar panel power supply circuit for use in surveillance cameras, characterized in that, include: The system comprises a solar panel, a charging management circuit, a boost circuit, a voltage regulator circuit, and a battery. The solar panel is electrically connected to the charging management circuit via a USB interface. The first path of the charging management circuit, after being connected in series with a current detection circuit, is electrically connected to the boost circuit. The second path of the charging management circuit, after being connected in series with the current detection circuit, is electrically connected to the battery. The boost circuit is electrically connected to the voltage regulator circuit. The third path of the charging management circuit, after being connected in series with the current detection circuit, serves as the first detection path and is electrically connected to the load. The charging management circuit has a second detection path that is electrically connected to a complex circuit. The first and second detection paths form a voltage detection circuit for the current detection circuit. The second detection path is used to detect the battery voltage. The voltage detection circuit feeds back to the charging management circuit. The output of the voltage regulator circuit serves as the power supply terminal for the load.

2. The solar panel power supply circuit for a surveillance camera according to claim 1, characterized in that, The current detection circuit is a detection resistor.

3. The solar panel power supply circuit for a surveillance camera according to claim 1, characterized in that, The charging management circuit is electrically connected to a charging indicator light circuit.

4. The solar panel power supply circuit for a surveillance camera according to claim 1, characterized in that, A filter circuit is electrically connected between the solar panel and the charging management circuit.

5. A solar panel power supply circuit for a surveillance camera according to claim 1, characterized in that, The first detection path is electrically connected to a filter circuit.

6. A solar panel power supply circuit for a surveillance camera according to claim 5, characterized in that, The second detection path is electrically connected to another filter circuit.

7. A solar panel power supply circuit for a surveillance camera according to claim 1, characterized in that, The charging management circuit is electrically connected to the load via a switching circuit.

8. A solar panel power supply circuit for a surveillance camera according to claim 7, characterized in that, The switching circuit includes a switching transistor, the control terminal of which is electrically connected to the load, the input terminal of which is electrically connected to the charging management circuit, and the output terminal of which is grounded.

9. A solar panel power supply circuit for a surveillance camera according to claim 1, characterized in that, The charging management circuit is connected in series with the temperature sensing circuit and electrically connected to the battery.

10. A solar panel power supply circuit for a surveillance camera according to claim 1, characterized in that, The charging management circuit is electrically connected to the boost circuit via a feedback switch circuit.

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