A passive camera circuit

Abstract

The utility model relates to camera circuit technical field discloses the circuit of passive netless camera, including main control module, power module, the power module includes wind power equipment, wind power supply unit, photovoltaic equipment, photovoltaic power supply unit, battery, battery power supply unit, camera power supply unit, wind power supply unit accesses wind power equipment, and photovoltaic power supply unit accesses photovoltaic equipment, and battery power supply unit accesses battery, and wind power supply unit and photovoltaic power supply unit are made for camera power supply through camera power supply unit, or make battery for camera power supply, main control module is connected with camera power supply unit, is used for controlling the switch of camera through camera power supply unit, the utility model discloses in order to satisfy the demand of railway safety, can realize integrated image acquisition, processing, transmission and so on, reduces hardware connection and breakdown simultaneously, makes full use of the renewable energy source.

Description

Technical Field

[0001] This utility model relates to the field of camera circuit technology, and in particular to a circuit for a passive, networkless camera. Background Technology

[0002] In some regions with developed railway transportation, IoT technology has been widely integrated into the railway operation and maintenance system. For line disaster monitoring, some high-end equipment uses solar-powered auxiliary power to achieve a certain degree of self-sustaining operation. For example, some railways have implemented intelligent monitoring equipment that integrates multiple sensors and uses solar energy to extend battery life; however, its power consumption management still has room for optimization, and the equipment cost remains extremely high, limiting its large-scale adoption. Another example is the use of wireless cameras in some railways, which reduces wiring; however, due to communication instability in complex environments, data transmission packet loss occurs frequently.

[0003] The ever-expanding railway network has created a massive demand for video surveillance. Currently, existing video surveillance methods on railway lines largely rely on traditional wired and fiber optic communications. This involves complex, time-consuming, and extremely costly upfront cabling projects, as well as high maintenance costs. While some low-power monitoring attempts have been made, the efficiency of solar energy utilization is poor, the equipment itself consumes a lot of power, making it difficult to maintain stable operation for extended periods. Insufficient IoT applications and low efficiency in the collaborative operation of various subsystems further reduce the overall real-time performance and accuracy of disaster monitoring. Utility Model Content

[0004] To meet the needs of railway safety, this utility model provides a circuit for a passive, network-free camera that integrates image acquisition, processing, and transmission functions, while reducing hardware connections and malfunctions and making full use of renewable energy.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions:

[0006] A circuit for a passive, network-free camera includes a main control module and a power supply module. The power supply module includes a wind power device, a wind power supply unit, a photovoltaic device, a photovoltaic power supply unit, a battery, a battery power supply unit, and a camera power supply unit.

[0007] The wind power supply unit is connected to the wind power equipment, the photovoltaic power supply unit is connected to the photovoltaic equipment, and the battery power supply unit is connected to the battery. The camera power supply unit enables the wind power supply unit and the photovoltaic power supply unit to power the camera, or enables the battery to power the camera.

[0008] The main control module is connected to the camera power supply unit and is used to control the camera's on / off state through the camera power supply unit;

[0009] The main control module includes a microcontroller U1.

[0010] Furthermore, the power supply module also includes a wind-solar voltage conversion unit and a load voltage conversion unit; the output terminals of the wind power supply unit and the photovoltaic power supply unit are respectively connected to the input terminal of the wind-solar voltage conversion unit and connected to the voltage VBUS; the output terminal of the wind-solar voltage conversion unit is connected to the input terminal of the load voltage conversion unit, the wind-solar voltage conversion unit outputs voltage VCC_16V, and the load voltage conversion unit outputs voltage DC_VCC; the output terminal of the load voltage conversion unit is connected to the input terminal of the camera power supply unit.

[0011] In the above scheme, the wind-solar voltage conversion unit is connected to both the wind power supply unit and the photovoltaic power supply unit to achieve wind-solar voltage conversion. The voltages generated by the two are converged to VBUS, which is then adjusted to VCC_16V by the wind-solar voltage conversion unit. VCC_16V is then stepped down to DC_VCC by the load voltage conversion unit, and DC_VCC is used to power the camera. This fully utilizes renewable energy sources such as wind and solar photovoltaic power generation to ensure maximum all-day sunlight capture.

[0012] Furthermore, the battery power supply unit includes transistor Q8, transistor Q9, and transistor Q10; the source of transistor Q9 is connected to the battery BAT+, the base of transistor Q8 is connected to the output terminals of the wind power supply unit and the photovoltaic power supply unit, the collector of transistor Q8 is connected to the gate of transistor Q10 and the source of transistor Q9 respectively, and the emitter of transistor Q8 and the source of transistor Q10 are both grounded; the gate of transistor Q9 is connected to the drain of transistor Q10, and the drain of transistor Q9 outputs a voltage DC_VCC.

[0013] Furthermore, whenever there is wind or solar power, the camera can be powered by wind or solar power, making efficient use of renewable energy.

[0014] Furthermore, the camera power supply unit includes interface J1, inductor L4, resistors R45, R46, R47, capacitors C43 and C44, transistor Q11, and transistor Q12. The first terminal of resistor R47 is connected to voltage DC_VCC. The second terminal of resistor R47 is connected to the first terminal of resistor R46 and the source of transistor Q11. The second terminal of resistor R46 is connected to the gate of transistor Q11 and the drain of transistor Q12. The gate of transistor Q12 and the first terminal of resistor R45 are connected to the PC9 pin of microcontroller U1. The drain of transistor Q11 is connected to the first terminal of inductor L4. The second terminal of inductor L4 is connected to interface J1, the first terminal of capacitor C43, and the first terminal of capacitor C44. The second terminals of capacitors C43 and C44, the source of transistor Q12, and the second terminal of resistor R45 are all grounded. Interface J1 is connected to the PA2 and PA3 pins of microcontroller U1. Interface J1 is also connected to the camera.

[0015] In the above scheme, by optimizing the circuit design, reducing power consumption during the data acquisition process, designing an intelligent sleep-wake mechanism, and dynamically adjusting the device's working mode, energy saving is maximized.

[0016] Furthermore, the communication module includes a communication chip U7 of model ICM42688-P; the AP_SDO pin, INT1 pin, AP_SDA pin, AP_SCLK pin, and INT2 pin of the communication chip U7 are connected one-to-one with the PB5 pin, PB4 pin, PB7 pin, PB6 pin, and PB3 pin of the microcontroller U1, respectively, for transmitting BM 270_SDO, BM270_INT1, I2C_SDA, I2C_SCL, and BM 270_INT2 signals.

[0017] The above scheme proposes a high-speed wireless communication technology for the Internet of Things with strong anti-interference capabilities, which adapts to the complex electromagnetic environment of railways, integrates multi-band redundant transmission, and ensures real-time and error-free transmission of monitoring data.

[0018] Furthermore, it also includes a charging module, which comprises a transistor U8, a charging chip U9, an inductor L6, resistors R63 and R64, a capacitor C63, a diode D19, LED1, and LED2. The source of transistor U8 is connected to the voltage VCC_16V output from the wind-solar voltage conversion unit, the gate of transistor U8 is connected to the DRV pin of charging chip U9, the PVCC pin of charging chip U9 is connected to the anodes of LED2 and LED1 respectively, and the cathode of LED2 is connected to the NCHRG pin of charging chip U9. The cathode of LED1 is connected to the NSTDBY pin of charging chip U9; the drain of transistor U8 is connected to the first end of inductor L6; the second end of inductor L6 is connected to the ISP pin of charging chip U9 and the anode of diode D19; the FB pin of charging chip U9 is connected to the first end of resistor R63; the second end of resistor R63 is connected to the second end of resistor R64 and the first end of capacitor C63; the second end of capacitor C63 is grounded; the first end of resistor R64 is connected to the cathode of diode D19; and the cathode of diode D19 is connected to battery BAT+.

[0019] In the above scheme, high-performance energy storage technology is studied, and charge and discharge management circuits are designed to prevent overcharging and over-discharging and stabilize power output.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: In order to meet the needs of railway safety, this utility model provides a circuit for a passive and networkless camera that can integrate image acquisition, processing, and transmission functions, while reducing hardware connections and failures, and making full use of renewable energy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a block diagram of the circuit module of this utility model;

[0023] Figure 2 This is the circuit schematic diagram of the main control module of this utility model;

[0024] Figure 3 This is the circuit diagram of the wind power supply unit of this utility model;

[0025] Figure 4 This is a circuit diagram of the photovoltaic power supply unit of this utility model;

[0026] Figure 5 This is a circuit diagram of the wind-solar voltage conversion unit of this utility model;

[0027] Figure 6 This is a circuit diagram of the load voltage conversion unit of this utility model;

[0028] Figure 7 This is a circuit diagram of the battery power supply unit of this utility model;

[0029] Figure 8 The circuit diagram of the camera power supply unit of this utility model is shown below.

[0030] Figure 9 This is a circuit diagram of the first step-down unit in the step-down module of this utility model;

[0031] Figure 10 This is a circuit diagram of the second step-down unit in the step-down module of this utility model;

[0032] Figure 11 This is the circuit schematic diagram of the communication module of this utility model;

[0033] Figure 12 This is the circuit schematic diagram of the protection module of this utility model;

[0034] Figure 13 This is a circuit diagram of the charging module of this utility model;

[0035] Figure 14 This is the circuit schematic diagram of the adapter module of this utility model. Figure 14 (a) in the diagram is the circuit schematic of USB interface U10 and voltage regulator U11. Figure 14(b) is the circuit schematic of the serial communication chip U12. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance, or suggesting any such actual relationship or order between these entities or operations. Additionally, terms such as "connected," "linked," etc., can refer to a direct connection between elements or an indirect connection via other elements.

[0038] Example 1:

[0039] This utility model is achieved through the following technical solution, such as Figure 1 As shown, a circuit for a passive, network-free camera includes a main control module, a power supply module, a step-down module, a communication module, a protection module, a charging module, and an adapter module.

[0040] like Figure 2 As shown, the main control module includes a single-chip microcomputer U1 with model number STM32L431RCT6.

[0041] The power supply module includes wind power equipment, wind power supply unit, photovoltaic equipment, photovoltaic power supply unit, battery, battery power supply unit, and camera power supply unit.

[0042] like Figure 3As shown, the wind power supply unit includes an interface CN1, a rectifier chip U2, a circuit breaker F1, resistors R2, R3, R4, R5, and R6, capacitors C7, C8, and C9, a Zener diode D2, a transistor Q0, and a transistor Q1. Interface CN1 receives the AC power generated by the wind turbine and transmits it to the rectifier chip U2 to convert AC to DC. The output terminal of the rectifier chip U2 is connected to the first terminal of the circuit breaker F1, and the second terminal of the circuit breaker F1 is connected to the first terminals of resistors R2, D2, C7, R3, and R5, respectively. The source of transistor Q0 is connected to ground. The second terminal of resistor R2, the second terminal of Zener diode D2, and the second terminal of capacitor C7 are all grounded. The second terminal of resistor R3 is connected to the first terminal of resistor R4 and the gate of transistor Q1, respectively. The second terminal of resistor R4 is grounded. The second terminal of resistor R5 is connected to the gate of transistor Q0 and the first terminal of resistor R6, respectively. The second terminal of resistor R6 is connected to the drain of transistor Q1. The drain of transistor Q0, the first terminal of capacitor C8, and the first terminal of capacitor C9 are connected together to serve as the output terminal of the wind power supply unit, with an output voltage VBUS. The source of transistor Q1, the second terminal of capacitor C8, and the second terminal of capacitor C9 are all grounded.

[0043] like Figure 4 As shown, the photovoltaic power supply unit includes interface CN2, circuit breaker F2, Zener diode D3, resistors R7, R8, R9, R10, and R11, capacitors C10, C11, and C12, transistor Q2, and transistor Q3. Interface CN2 is connected to the DC power generated by the photovoltaic device. The output terminal of interface CN2 is connected to the first terminal of circuit breaker F2. The second terminal of circuit breaker F2 is connected to the first terminals of resistors R7, D3, C10, R8, and R10, and the source of transistor Q2, respectively. The second terminal of resistor R7, the second terminal of Zener diode D3, and the second terminal of capacitor C10 are all grounded; the second terminal of resistor R8 is connected to the first terminal of resistor R9 and the gate of transistor Q3, respectively; the second terminal of resistor R10 is connected to the gate of transistor Q2 and the first terminal of resistor R11, respectively; the second terminal of resistor R11 is connected to the drain of transistor Q3; the drain of transistor Q2, the first terminal of capacitor C11, and the first terminal of capacitor C12 are connected together to serve as the output terminal of the photovoltaic power supply unit, with an output voltage VBUS; the source of transistor Q3, the second terminal of capacitor C11, and the second terminal of capacitor C12 are all grounded.

[0044] like Figure 5 , Figure 6 As shown, the power supply module also includes a wind-solar voltage conversion unit and a load voltage conversion unit. Figure 5The wind-solar voltage conversion unit includes a constant voltage control chip U3, a transistor Q4, a transistor Q5, inductors L1 and L2, diodes D4, D5, D6, and D7, resistors R12, R26, and R27, and capacitors C13 and C23. The constant voltage control chip U3 is model SL4010. Resistor R12, transistor Q4, and diode D4 form a voltage regulator circuit to ensure that when VBUS exceeds 24V, the operating input voltage of the constant voltage control chip U3 does not exceed the protection limit of VIN, thereby expanding the circuit's operating range. The base of transistor Q4 is connected to the cathode of Zener diode D4 and the first terminal of capacitor C13, respectively. The voltage VBUS output from the wind power unit and the photovoltaic power unit is connected to the collector of transistor Q4, the first terminal of resistor R12, and the first terminal of inductor L1, respectively. The second terminal of resistor R12 is connected to the cathode of diode D4 and the first terminal of capacitor C13, respectively. The anode of diode D4 and the second terminal of capacitor C13 are both grounded. The second terminal of inductor L1 is connected to the drain of transistor Q5, the anode of diode D6, and the first terminal of inductor L2, respectively. The second terminal of inductor L2 is grounded. The gate is connected to the GATE pin of the constant voltage control chip U3, and the source of transistor Q5 is grounded. The cathode of diode D6 is connected to the anode of diode D7 and the first end of resistor R26. The second end of resistor R26 is connected to the cathode of diode D5, the first end of resistor R27, and the first end of capacitor C23, and then connected to the PA5 pin of microcontroller U1 (to transmit ADC4 signal). The anode of diode D5, the second end of resistor R27, and the second end of capacitor C23 are all grounded. The cathode of diode D7 serves as the output terminal of the wind-solar voltage conversion unit, with an output voltage of VCC_16V.

[0045] Figure 6 The load voltage conversion unit includes a buck converter U4, an inductor L3, resistors R35, R36, and R37, transistor Q6, and transistor Q7; the buck converter U4 is an SGM61450XPS8G. The VIN pin of the buck converter U4 is connected to the output voltage VCC_16V of the wind and solar voltage conversion unit; the SW pin of the buck converter U4 is connected to the first terminal of inductor L3; the second terminal of inductor L3 is connected to the first terminals of resistors R35 and R37, and the source of transistor Q6; the second terminal of resistor R35 is connected to the first terminal of resistor R36 and the gate of transistor Q7; the second terminal of resistor R37 is connected to the gate of transistor Q6 and the drain of transistor Q7; the second terminal of resistor R36 and the source of transistor Q7 are both grounded; the drain of transistor Q6 serves as the output terminal of the load voltage conversion unit, providing the load (camera) output voltage DC_VCC.

[0046] like Figure 7As shown, the battery power supply unit includes resistors R38, R39, R40, R41, R42, R43, R44, and R65; capacitors C39, C40, C41, and C42; diodes D9 and D10; transistor Q8; and transistors Q9 and Q10. The battery power supply unit is connected to the battery BAT+. The first terminals of resistors R38, R41, and R43, and the source of transistor Q9 are connected to the battery BAT+. The second terminals of resistors R38 and R39, and the cathode of diode D9 are connected to the PA4 pin of the microcontroller U1 (for transmitting the ADC3 signal). The anode of diode D9 and the second terminal of resistor R39 are both grounded. The voltage VBUS output from the wind power supply unit and the photovoltaic power supply unit is connected to the first terminal of resistor R65. The second terminal of resistor R65 is connected to the cathode of diode D10. The cathode, the first terminal of capacitor C39, the first terminal of resistor R40, and the base of transistor Q8 are connected. The anode of diode D10, the second terminal of capacitor C39, the second terminal of resistor R40, and the emitter of transistor Q8 are all grounded. The collector of transistor Q8 is connected to the second terminal of resistor R41, the first terminal of resistor R42, and the gate of transistor Q10. The second terminal of resistor R43 is connected to the gate of transistor Q9 and the first terminal of resistor R44. The second terminal of resistor R44 is connected to the drain of transistor Q10. The second terminal of resistor R42 and the source of transistor Q10 are both grounded. The drain of transistor Q9 is connected to the first terminals of capacitors C40, C41, and C42, and serves as the output terminal of the battery power supply unit, providing the load (camera) with the output voltage DC_VCC. The source of transistor Q10, the second terminal of capacitor C40, the second terminal of capacitor C41, and the second terminal of capacitor C42 are all grounded.

[0047] like Figure 8As shown, the camera power supply unit includes interface J1, inductor L4, resistors R45, R46, and R47, capacitors C43 and C44, transistor Q11, and transistor Q12. The first terminal of resistor R47 is connected to voltage DC_VCC. The second terminal of resistor R47 is connected to the first terminal of resistor R46 and the source of transistor Q11. The second terminal of resistor R46 is connected to the gate of transistor Q11 and the drain of transistor Q12. The gate of transistor Q12 and the first terminal of resistor R45 are connected to PC9 of microcontroller U1. Pin connections (transmitting SXT_EN signal); the drain of transistor Q11 is connected to the first end of inductor L4, the second end of inductor L4 is connected to interface J1, the first end of capacitor C43, and the first end of capacitor C44 respectively, the second ends of capacitor C43, capacitor C44, the source of transistor Q12, and the second end of resistor R45 are all grounded; interface J1 is connected to the PA2 and PA3 pins of microcontroller U1 respectively (transmitting PTC08_RX_1 and PTC08_TX_1 signals); interface J1 is also connected to the load (camera).

[0048] Please see Figures 2-8 The working principle of the main control module and the power supply module is as follows: Figure 3 The circuit connected to the wind turbine. Figure 4 The circuit connected to the solar photovoltaic panel and the voltage generated by the two components converge into VBUS, which is then transmitted through... Figure 5 The constant voltage idle chip U3 is adjusted to VCC_16V; VCC_16V is passed through Figure 6 The step-down converter U4 steps down the voltage to DC_VCC; DC_VCC is used to power the camera. Figure 7 The circuit selects whether the camera is powered by the battery or VCC_16V. Once VBUS (wind power, photovoltaic) is available, the battery power is cut off and the camera is powered by the wind or photovoltaic. Figure 8 For the camera interface and power supply switch, by Figure 2 Controlled by the SXT_EN signal of the microcontroller U1; Figure 7 When VBUS is high (in wind or solar power generation), transistors Q8 and Q10 are turned on, while transistor Q9 is turned off, and DC_VCC is controlled by... Figure 6The DC_VCC is provided by stepping down the 16V voltage. Once VBUS is low (wind and solar voltage is 0), transistors Q8 and Q10 are cut off, transistor Q9 is turned on, and DC_VCC is supplied by the battery BAT+. When the camera needs to be started, SXT_EN is high, transistors Q12 and Q11 are turned on, and DC_VCC powers the camera. When the camera needs to be turned off, SXT_EN is low, transistors Q12 and Q11 are cut off, and the camera has no power. Interface J1 transmits and downloads data to and from the microcontroller U1 via PTC08_RX_1 and PTC08_TX_1.

[0049] The step-down module includes a first step-down unit and a second step-down unit. For example... Figure 9 As shown, the first step-down unit includes a first step-down chip U5 (model TD1663) and an inductor L5. The VIN pin of the first step-down chip U5 is connected to a voltage of VCC_16V, the SW pin of the first step-down chip U5 is connected to the first terminal of the inductor L5, and the second terminal of the inductor L5 outputs a voltage of VCC_5V. Figure 10 As shown, the second step-down unit includes a second step-down chip U6 (model ME6211C33M5GN). The VIN pin of the second step-down chip U6 is connected to the voltage VCC_5V, and the VOUT pin of the second step-down chip U6 outputs the voltage VCC_MCU. The voltage VCC_MCU powers the microcontroller U1.

[0050] Please see Figures 9-10 The working principle of the step-down module is as follows: the first step-down unit steps down the voltage VCC_16V output by the wind-solar voltage conversion unit to VCC_5V, and then the second step-down unit steps down the voltage VCC_5V to VCC_MCU. The voltage VCC_MCU is dedicated to powering the microcontroller U1.

[0051] like Figure 11 As shown, the communication module includes a communication chip U7 of model ICM42688-P; the AP_SDO pin, INT1 pin, AP_SDA pin, AP_SCLK pin, and INT2 pin of the communication chip U7 are connected one-to-one with the PB5 pin, PB4 pin, PB7 pin, PB6 pin, and PB3 pin of the microcontroller U1, respectively, for transmitting BM270_SDO, BM270_INT1, I2C_SDA, I2C_SCL, and BM270_INT2 signals.

[0052] The working principle of the communication module is as follows: This camera does not require wired (such as network cable, signal cable, fiber optic cable, etc.) or gateway (WIFI, Bluetooth, etc.) connection for communication. It realizes high-speed wireless communication technology of IoT with strong anti-interference and adapts to the complex electromagnetic environment of railway. The communication chip U7 can integrate multi-band redundant transmission to ensure real-time and error-free transmission of monitoring data, realizing a network-free camera.

[0053] like Figure 12 As shown, the protection module includes TVS diodes D12, D13, D14, D15, D16, and D17. The cathodes of TVS diodes D12, D13, D14, D15, D16, and D17 are connected one-to-one with the PC4, PC5, PB0, PB1, PB2, and PB10 pins of the microcontroller U1, respectively, for transmitting H_RX, H_TX, M0, M, RES, and STATUS signals.

[0054] The protection module works as follows: The TVS diode in the protection module is an electrostatic discharge protection diode, model ESD9L5.0ST5G, used to protect the circuit from electrostatic discharge (ESD) damage. Under normal operating voltage, the TVS diode exhibits high resistance. When the voltage exceeds its breakdown voltage (such as the high voltage generated by an ESD surge), it will instantaneously conduct and absorb the overvoltage energy, clamping the voltage within a safe range, thus protecting the circuit. The connection to the H_RX (receive) and H_TX (transmit) signal lines of the microcontroller U1 ensures that the TVS diode quickly conducts to discharge static electricity when encountering electrostatic shocks, guaranteeing stable signal transmission and circuit safety.

[0055] like Figure 13As shown, the charging module includes transistor U8, charging chip U9, inductor L6, resistors R55, R56, R57, R58, R62, R63, R64, capacitors C58 and C63, diode D19, LED1, and LED2; the charging chip U9 is model SLM6900. The source of transistor U8 is connected to the voltage VCC_16V output from the wind-solar voltage conversion unit. The first terminal of resistor R55 is connected to the source of transistor U8. The gate of transistor U8 is connected to the first terminal of resistor R56 and the DRV pin of charging chip U9. The PVCC pin of charging chip U9 is connected to the second terminals of resistors R55, R56, R57, and R58, and the first terminal of capacitor C58. The second terminal of capacitor C58 is grounded. The second terminal of resistor R57 is connected to the anode of LED2. The cathode of LED2 is connected to the NCHRG pin of charging chip U9. The second terminal of resistor R58 is connected to the L... The anode of LED1 is connected, and the cathode of LED1 is connected to the NSTDBY pin of charging chip U9. The drain of transistor U8 is connected to the first end of inductor L6. The second end of inductor L6 is connected to the ISP pin of charging chip U9 and the first end of resistor R62. The second end of resistor R62 is connected to the anode of diode D19. The FB pin of charging chip U9 is connected to the first end of resistor R63. The second end of resistor R63 is connected to the second end of resistor R64 and the first end of capacitor C63. The second end of capacitor C63 is grounded. The first end of resistor R64 is connected to the cathode of diode D19. The cathode of diode D19 is connected to battery BAT+.

[0056] Please see Figure 13 The charging module works as follows: when the wind turbine and solar panels generate electricity, VCC_16V is simultaneously supplied through... Figure 13 The charging chip U9 circuit charges the battery. Figure 13 This is the charging control circuit, used to protect the battery during charging. The DRV pin of the charging chip U9 is externally connected to the gate drive terminal of the PMOS transistor U8. The voltage at this terminal is clamped within the range of VCC_16V to 6.3V by the GVC pin. A low VGS model of PMOS transistor U8 can be selected to improve charging efficiency and reduce cost. The NCHRG pin is the charging status indicator. When VCC_16V is charging the battery, this pin is pulled low by an internal switch, indicating that charging is in progress. Otherwise, this pin is in a high-impedance state, and LED2 is lit. The NSTDBY pin is the battery full charge indicator. When the battery is fully charged, this pin is pulled low by an internal switch. Otherwise, this pin is in a high-impedance state, and LED1 is lit. When the charging status is abnormal, both NCHRG and NSTDBY are in a high-impedance state, and neither LED is lit.

[0057] like Figure 14As shown, the adapter module includes a USB interface U10, a voltage regulator U11, and a serial communication chip U12. The VBUS pin of the USB interface U10 is connected to the VIN pin and CE pin of the voltage regulator U11, respectively. The DP2 pin and DP1 pin of the USB interface U10 are connected to the UD+ pin of the serial communication chip U12, respectively. The DN1 pin and DN2 pin of the USB interface U10 are connected to the UD- pin of the serial communication chip U12, respectively. The RXD pin and TXD pin of the serial communication chip U12 are connected to the PA9 pin and PA10 pin of the microcontroller U1, respectively, for transmitting COM2_RX and COM2_TX signals.

[0058] Please see Figure 14 , Figure 14 In the diagram, (a) refers to USB interface U10 and voltage regulator U11. Figure 14 (b) is the serial communication chip U12, which is connected to the microcontroller U1 for receiving or sending data. U12 is also connected to U10 to convert between the USB interface and the serial port. U10 is a USB interface that connects to an external host computer, enabling communication and control between the host computer and the microcontroller. When the host computer is connected to the microcontroller, the voltage regulator U11 provides overvoltage protection.

[0059] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A circuit for a passive, network-free camera, characterized in that, It includes a main control module and a power supply module. The power supply module includes wind power equipment, wind power supply unit, photovoltaic equipment, photovoltaic power supply unit, battery, battery power supply unit, and camera power supply unit. The wind power supply unit is connected to the wind power equipment, the photovoltaic power supply unit is connected to the photovoltaic equipment, and the battery power supply unit is connected to the battery. The camera power supply unit enables the wind power supply unit and the photovoltaic power supply unit to power the camera, or enables the battery to power the camera. The main control module is connected to the camera power supply unit and is used to control the camera's on / off state through the camera power supply unit; The main control module includes a microcontroller U1.

2. The circuit for a passive, network-free camera according to claim 1, characterized in that, The power supply module also includes a wind-solar voltage conversion unit and a load voltage conversion unit; the output terminals of the wind power supply unit and the photovoltaic power supply unit are respectively connected to the input terminal of the wind-solar voltage conversion unit and connected to the voltage VBUS; the output terminal of the wind-solar voltage conversion unit is connected to the input terminal of the load voltage conversion unit, the wind-solar voltage conversion unit outputs voltage VCC_16V, and the load voltage conversion unit outputs voltage DC_VCC; the output terminal of the load voltage conversion unit is connected to the input terminal of the camera power supply unit.

3. The circuit of a passive, network-free camera according to claim 2, characterized in that, The battery power supply unit includes transistor Q8, transistor Q9, and transistor Q10; The source of transistor Q9 is connected to the battery BAT+, the base of transistor Q8 is connected to the output of the wind power supply unit and the output of the photovoltaic power supply unit, the collector of transistor Q8 is connected to the gate of transistor Q10 and the source of transistor Q9 respectively, and the emitter of transistor Q8 and the source of transistor Q10 are both grounded. The gate of transistor Q9 is connected to the drain of transistor Q10, and the drain output voltage of transistor Q9 is DC_VCC.

4. The circuit of a passive, network-free camera according to claim 3, characterized in that, The camera power supply unit includes interface J1, inductor L4, resistors R45, R46, R47, capacitors C43 and C44, transistor Q11, and transistor Q12. The first terminal of resistor R47 is connected to voltage DC_VCC. The second terminal of resistor R47 is connected to the first terminal of resistor R46 and the source of transistor Q11. The second terminal of resistor R46 is connected to the gate of transistor Q11 and the drain of transistor Q12. The gate of transistor Q12 and the first terminal of resistor R45 are connected to pin PC9 of microcontroller U1. The drain of transistor Q11 is connected to the first terminal of inductor L4. The second terminal of inductor L4 is connected to interface J1, the first terminal of capacitor C43, and the first terminal of capacitor C44. The second terminals of capacitors C43 and C44, the source of transistor Q12, and the second terminal of resistor R45 are all grounded. Interface J1 is connected to pins PA2 and PA3 of microcontroller U1. Interface J1 is also connected to the camera.

5. The circuit of a passive, network-free camera according to claim 1, characterized in that, It also includes a communication module, which includes a communication chip U7 of model ICM42688-P. The AP_SDO, INT1, AP_SDA, AP_SCLK, and INT2 pins of the communication chip U7 are connected one-to-one with the PB5, PB4, PB7, PB6, and PB3 pins of the microcontroller U1, respectively, for transmitting BM270_SDO, BM270_INT1, I2C_SDA, I2C_SCL, and BM270_INT2 signals.

6. The circuit for a passive, network-free camera according to claim 2, characterized in that, It also includes a charging module, which comprises a transistor U8, a charging chip U9, an inductor L6, resistors R63 and R64, a capacitor C63, a diode D19, LED1, and LED2. The source of transistor U8 is connected to the voltage VCC_16V output from the wind-solar voltage conversion unit. The gate of transistor U8 is connected to the DRV pin of the charging chip U9. The PVCC pin of the charging chip U9 is connected to the anodes of LED2 and LED1, respectively. The cathode of LED2 is connected to the NCHRG pin of the charging chip U9. The cathode of lamp 1 is connected to the NSTDBY pin of charging chip U9; the drain of transistor U8 is connected to the first end of inductor L6; the second end of inductor L6 is connected to the ISP pin of charging chip U9 and the anode of diode D19; the FB pin of charging chip U9 is connected to the first end of resistor R63; the second end of resistor R63 is connected to the second end of resistor R64 and the first end of capacitor C63; the second end of capacitor C63 is grounded; the first end of resistor R64 is connected to the cathode of diode D19; and the cathode of diode D19 is connected to battery BAT+.

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