A power supply circuit for a photovoltaic sensor

Abstract

The utility model discloses a kind of power supply circuit of photovoltaic sensor, including DC-DC power supply chip, voltage sampling circuit is connected with the input end of DC-DC power supply chip, the output end of DC-DC power supply chip is connected with freewheeling circuit, one end of positive feedback circuit is connected in the input end of DC-DC power supply chip, and the other end is connected in the output end of freewheeling circuit.The utility model is sampled in real time to photovoltaic panel input voltage by voltage sampling circuit, and hysteresis threshold is formed using positive feedback mechanism, ensure that power supply is stable and reliable operation near starting voltage critical point, effectively prevent the system frequent start-stop problem caused by photovoltaic panel output voltage fluctuation due to illumination fluctuation, to ensure that power supply circuit can efficiently, stably extract photovoltaic panel energy in very wide input voltage range, provide continuous reliable electric energy for rear-end sensor.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic panel monitoring technology, specifically to a power supply circuit for a photovoltaic sensor. Background Technology

[0002] Currently, the operation and maintenance of photovoltaic power plants mainly relies on traditional manual inspections and drone patrols, which have significant limitations. Working at heights, on rooftops, and on water surfaces poses extremely high safety risks to manual inspections. Furthermore, manual inspections are highly subjective, resulting in a high rate of missed faults and severely impacting operation and maintenance efficiency. More importantly, because faults cannot be detected in real time, subsequent handling is often severely delayed, leading to a significant proportion of power generation losses and substantially increasing the operating costs of power plants. The industry urgently needs an automated solution that can achieve real-time, accurate monitoring.

[0003] To overcome this challenge, developing data acquisition sensors that can be installed on each photovoltaic panel is crucial. These sensors can continuously monitor key parameters such as voltage, current, and temperature of the photovoltaic panels, enabling immediate alarms and precise fault location, thereby transforming the operation and maintenance mode from passive response to proactive early warning. However, the deployment of these sensors faces a fundamental challenge: how to power the numerous and widely distributed sensors on the photovoltaic panels. Traditional wiring methods are extremely costly, and the drastic fluctuations in the output voltage of the photovoltaic panels lead to low energy harvesting efficiency, unstable output voltage, and even system crashes in the sensor power supply circuits. Regularly replacing batteries is also impractical. Therefore, developing a dedicated power supply circuit that can draw power from the photovoltaic panels themselves and achieve stable self-sufficiency in energy becomes a necessary prerequisite for the realization of the entire sensor system. Utility Model Content

[0004] The purpose of this invention is to solve the problems of low energy harvesting efficiency, unstable output voltage, and even system crashes caused by drastic fluctuations in the output voltage of photovoltaic panels in traditional power supply circuits. The invention proposes a power supply circuit for a photovoltaic sensor that adopts a high-efficiency sampling and feedback compensation design, ensuring that the power supply circuit can efficiently and stably extract energy from the photovoltaic panel within an extremely wide input voltage range, providing continuous and reliable power to the downstream sensor.

[0005] To achieve the above objectives, this utility model provides a power supply circuit for a photovoltaic sensor, including a DC-DC power chip, a voltage sampling circuit, and a positive feedback circuit. The voltage sampling circuit is connected to the input terminal of the DC-DC power chip, and a freewheeling circuit is connected to the output terminal of the DC-DC power chip. One end of the positive feedback circuit is connected to the input terminal of the DC-DC power chip, and the other end is connected to the output terminal of the freewheeling circuit. The voltage sampling circuit includes: resistor R1 and resistor R2. One end of resistor R1 is connected to the power input terminal and input pin 1 of the DC-DC power chip, and the other end is connected to the enable pin 2 of the DC-DC power chip and one end of resistor R2. The other end of resistor R2 is connected to the common ground. The positive feedback circuit includes: capacitor C1, resistor R3 and diode D1. One end of capacitor C1 is connected to one end of resistor R3 and the enable pin 2 of DC-DC power chip, and the other end is connected to common ground. The other end of resistor R3 is connected to the negative terminal of diode D1, and the positive terminal of diode D1 is connected to freewheeling circuit.

[0006] As a further improvement to this technical solution, the freewheeling circuit includes: inductor L1, diode D2 and capacitor C2. The inductor L1 and diode D2 are connected in series to the output pin 3 of the DC-DC power supply chip. The other end of diode D2 is connected to the common ground. The inductor L1 and capacitor C2 are connected in series to the positive terminal of diode D1 and the power output terminal. The other end of capacitor C2 is connected to the common ground.

[0007] As a further improvement to this technical solution, the DC-DC power chip is provided with a grounding pin 4 for connecting to a common ground.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model sets up a voltage sampling circuit for a DC-DC power chip composed of R1 and R2. When the voltage sampling circuit detects that the input voltage of the photovoltaic panel reaches the chip's start-up threshold, it immediately triggers an enable signal to start the DC-DC power chip, achieving efficient sampling. Subsequently, a portion or all of the output voltage is fed back to the enable terminal through a positive feedback circuit, raising the enable pin voltage of the DC-DC power chip. This makes the input voltage much higher than the start-up threshold, thus enabling the power supply circuit of the photovoltaic sensor, composed of the voltage sampling circuit and the positive feedback circuit, to sample the input voltage of the photovoltaic panel in real time through the voltage sampling circuit and form a hysteresis threshold using the positive feedback mechanism. This ensures that the power supply operates stably and reliably near the start-up voltage critical point, effectively preventing frequent system start-ups and shutdowns caused by fluctuations in the output voltage of the photovoltaic panel due to light fluctuations. This ensures that the power supply circuit can efficiently and stably extract energy from the photovoltaic panel within an extremely wide input voltage range, providing continuous and reliable power to the downstream sensor. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a circuit diagram of a power supply circuit for a photovoltaic sensor according to an embodiment of the present invention. Detailed Implementation

[0011] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0012] In the description of the embodiments of this utility model, it should be understood that if the embodiments of this utility model involve directional indications, such as up, down, left, right, front, back, inside, outside, etc., the orientation or positional relationship of the indications is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0013] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0014] In this embodiment of the invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a structure. They can be mechanical or electrical connections. They can be direct connections or indirect connections through an intermediate medium, and can represent the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0015] like Figure 1 As shown, this embodiment of the present invention provides a power supply circuit for a photovoltaic sensor, including a DC-DC power chip, a voltage sampling circuit, and a positive feedback circuit. The voltage sampling circuit is connected to the input terminal of the DC-DC power chip, and a freewheeling circuit is connected to the output terminal of the DC-DC power chip. One end of the positive feedback circuit is connected to the input terminal of the DC-DC power chip, and the other end is connected to the output terminal of the freewheeling circuit.

[0016] In this embodiment, the voltage sampling circuit includes: resistor R1 and resistor R2. One end of resistor R1 is connected to the power input terminal and input pin 1 of the DC-DC power chip, and the other end is connected to the enable pin 2 of the DC-DC power chip and one end of resistor R2. The other end of resistor R2 is connected to the common ground.

[0017] Specifically, when the voltage sampling circuit detects that the input voltage of the photovoltaic panel reaches the chip's start-up threshold, it immediately triggers the enable signal to start the DC-DC power chip and achieve efficient sampling. A resistor R1 is connected between input pin 1 and enable pin 2. Resistor R1 is a pull-up resistor, and enable pin 2 is the chip's enable pin. After being pulled up, the DC-DC power chip works normally.

[0018] In this embodiment, the positive feedback circuit includes: capacitor C1, resistor R3 and diode D1. One end of capacitor C1 is connected to one end of resistor R3 and the enable pin 2 of DC-DC power chip, and the other end is connected to common ground. The other end of resistor R3 is connected to the negative terminal of diode D1, and the positive terminal of diode D1 is connected to freewheeling circuit.

[0019] Specifically, after the DC-DC chip is started, it feeds back part or all of the output voltage to the enable terminal through a positive feedback circuit, thereby raising the enable pin voltage of the DC-DC power chip and making the output voltage much higher than the start-up threshold.

[0020] In this embodiment, the freewheeling circuit includes: inductor L1, diode D2 and capacitor C2. The inductor L1 and diode D2 are connected in series to the output pin 3 of the DC-DC power supply chip. The other end of diode D2 is connected to the common ground. The inductor L1 and capacitor C2 are connected in series to the positive terminal of diode D1 and the power supply output terminal. The other end of capacitor C2 is connected to the common ground.

[0021] Specifically, the switching current generated by pin 3 of the DC-DC power chip is stored in inductor L1. When pin 3 of the DC-DC power chip is on, inductor L1 is charged, and the input voltage of the DC-DC power chip is higher than the output voltage. When pin 3 of the DC-DC power chip is off, the voltage of inductor L1 is reversed and discharged, and the output voltage of the DC-DC power chip is higher than the input voltage. At this time, the output of inductor L1 is at zero potential, and the input is at negative potential. The diode D2 in the freewheeling circuit and the load form a discharge circuit for inductor L1. Inductor L1 completes energy conversion by releasing the stored magnetic energy, effectively improving the output current and load stability. Capacitor C2 suppresses current surges, stabilizes the output voltage, and improves the circuit's anti-interference capability.

[0022] In this embodiment, the DC-DC power chip is provided with a grounding pin 4 that is connected to the common ground.

[0023] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power supply circuit for a photovoltaic sensor, characterized in that, It includes a DC-DC power supply chip, a voltage sampling circuit, and a positive feedback circuit. The voltage sampling circuit is connected to the input terminal of the DC-DC power supply chip, and a freewheeling circuit is connected to the output terminal of the DC-DC power supply chip. One end of the positive feedback circuit is connected to the input terminal of the DC-DC power supply chip, and the other end is connected to the output terminal of the freewheeling circuit. The voltage sampling circuit includes: resistor R1 and resistor R2. One end of resistor R1 is connected to the power input terminal and input pin 1 of the DC-DC power chip, and the other end is connected to the enable pin 2 of the DC-DC power chip and one end of resistor R2. The other end of resistor R2 is connected to the common ground. The positive feedback circuit includes: capacitor C1, resistor R3 and diode D1. One end of capacitor C1 is connected to one end of resistor R3 and the enable pin 2 of DC-DC power chip, and the other end is connected to common ground. The other end of resistor R3 is connected to the negative terminal of diode D1, and the positive terminal of diode D1 is connected to freewheeling circuit.

2. The power supply circuit for a photovoltaic sensor according to claim 1, characterized in that, The freewheeling circuit includes: inductor L1, diode D2 and capacitor C2. The inductor L1 and diode D2 are connected in series to the output pin 3 of the DC-DC power supply chip. The other end of diode D2 is connected to the common ground. The inductor L1 and capacitor C2 are connected in series to the positive terminal of diode D1 and the power supply output terminal. The other end of capacitor C2 is connected to the common ground.

3. The power supply circuit for a photovoltaic sensor according to claim 1, characterized in that, The DC-DC power chip has a grounding pin 4 that connects to the common ground.

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