Micro-power-consumption CT self-energy-taking circuit, method and device

Abstract

The invention belongs to the technical field of power system automation, and discloses a micro-power-consumption CT self-energy-taking circuit, method and device, and the micro-power-consumption CT self-energy-taking circuit comprises an energy taking module, a discharging module, a power supply module and an energy consumption management module. The energy taking module is used for taking electricity from an overhead line in a non-intrusive induction manner to generate induced electromotive force and converting the induced electromotive force into direct current; the discharge module is connected with the energy taking module, the power supply module is connected with the discharge module, the energy consumption management module comprises a protection circuit, an energy conditioning circuit and a time-sharing power supply circuit, the protection circuit is connected with the energy taking module, the energy conditioning circuit is connected between the energy taking module and the discharge module, and the time-sharing power supply circuit is connected with the discharge module. And the time-sharing power supply circuit is respectively connected with the protection circuit and the power supply module. According to the invention, the energy conversion efficiency is improved, the power supply time can be intelligently adjusted, the electric energy distribution is optimized, and the circuit and the post-stage load are protected from being damaged.

Description

Technical Field

[0001] The present invention relates to the field of power system automation, and in particular to a micro-power consumption CT self-energy extraction circuit, method and device. Background Art

[0002] In the prior art, CT (Current Transformer) power supply has the characteristics of miniaturization, passive wireless, and low cost. As long as there is a large enough current in the wire, it can continuously provide power to the sensor device to meet the needs of fast and reliable power supply. It is increasingly becoming the main energy source for micro power sensor devices. However, the current CT power supply device has not yet achieved efficient utilization and precise distribution of energy under complex working conditions. It is difficult to sense the excess power when a large current is discharged, take as much power as possible under a small current in the wire, and maintain the device working under a weak current. Therefore, the existing CT power supply device cannot achieve the integrated use of energy consumption management modes such as maximum power supply, adaptive low power output, and active protection, resulting in limitations in the conversion efficiency of the CT power supply device. Especially under high current conditions, it is difficult to achieve efficient energy conversion and full utilization of electric energy. In addition, when the grid current changes, the CT power supply device cannot adaptively adjust the power supply to match different current levels and the energy requirements of the sensor device, affecting the continuous operation and performance of the sensor device. At the same time, the existing CT power supply device lacks effective active protection measures such as overload protection, short circuit protection, and overheating protection, which increases the risk of device damage. Summary of the invention

[0003] The main purpose of this application is to provide a micro-power CT self-energy extraction circuit, method and device, aiming to solve the technical problem that the existing CT power extraction device cannot achieve the integrated use of energy consumption management modes such as maximum power extraction, adaptive low power output, and active protection.

[0004] In order to achieve the above-mentioned object, the present invention proposes a micro-power consumption CT self-energy extraction circuit, including an energy extraction module, a discharge module, a power supply module and an energy consumption management module;

[0005] The energy acquisition module is used to non-invasively inductively acquire power from the overhead line to generate an induced electromotive force, and convert the induced electromotive force into direct current;

[0006] The discharge module is connected to the energy acquisition module, and is used to receive the direct current output by the energy acquisition module and output a charging voltage;

[0007] The power supply module is connected to the discharge module, and is used to convert the charging voltage output by the discharge module into low-voltage power supply and drive the subsequent load circuit;

[0008] The energy consumption management module includes a protection circuit, an energy conditioning circuit and a time-sharing power supply circuit. The protection circuit is connected to the energy acquisition module, and is used to monitor the intensity of the induced electromotive force and control the energy discharge and energy input cut-off of the energy acquisition module; the energy conditioning circuit is connected between the energy acquisition module and the discharge module, and is used to control the discharge power of the energy acquisition module; the time-sharing power supply circuit is respectively connected to the protection circuit and the power supply module, and is used to control the output power of the subsequent load circuit.

[0009] Furthermore, the energy extraction module includes an energy extraction magnetic ring, a tuning capacitor, a lightning protection device and a rectifier bridge. The energy extraction magnetic ring is arranged on the overhead line, and the tuning capacitor, the lightning protection device and the rectifier bridge are respectively connected in parallel with the energy extraction magnetic ring.

[0010] Furthermore, the discharge module includes a voltage stabilizing circuit, a charging circuit and an energy storage circuit, the first end of the voltage stabilizing circuit is connected to the rectifier bridge, the first end of the charging circuit is connected to the second end of the voltage stabilizing circuit, the first end of the energy storage circuit is connected to the second end of the charging circuit, and the energy storage circuit is used to store electrical energy in a battery.

[0011] Furthermore, the micro-power CT self-energy extraction circuit also includes a power management unit, which is respectively connected to the protection circuit and the time-sharing power supply circuit, and the power management unit is used to monitor the energy extraction voltage and input voltage of the energy extraction module, and the charging voltage of the discharge module.

[0012] Furthermore, the protection circuit includes a passive protection discharge circuit, an active protection discharge circuit and a dual embedded voltage protection circuit, and the power management unit; the passive protection discharge circuit is connected in parallel with the energy extraction magnetic ring; the first end of the active protection discharge circuit is connected to the passive protection discharge circuit, and the second end of the active protection discharge circuit is connected to the power management unit; the dual embedded voltage protection circuit is connected between the energy extraction module and the discharge module.

[0013] Furthermore, the dual embedded voltage protection circuit includes a first Zener diode and a second Zener diode connected in parallel with the first Zener diode, the first end of the first Zener diode and the first end of the second Zener diode are respectively connected to the rectifier bridge and the voltage stabilizing circuit, the second end of the first Zener diode and the second end of the second Zener diode are respectively grounded, and a switch element is arranged between the first end of the first Zener diode and the first end of the second Zener diode.

[0014] Furthermore, the energy conditioning circuit includes a Schmitt trigger and a first resistor, the first end of the Schmitt trigger is connected to the rectifier bridge, the second end of the Schmitt trigger is connected to the dual-embedded voltage protection circuit, the first end of the first resistor is connected to the Schmitt trigger, and the second end of the first resistor is grounded.

[0015] Furthermore, the micro-power consumption CT self-energy extraction circuit also includes a key node monitoring circuit, which includes a second resistor and an operational amplifier, wherein the first end of the second resistor is connected to the switch element, the second end of the second resistor is grounded, the first end of the operational amplifier is connected to the second end of the second resistor and the grounded line, and the second end of the operational amplifier is connected to the power management unit.

[0016] The present invention further proposes a micro-power CT self-energy extraction method, which is applied to the micro-power CT self-energy extraction circuit described in any one of the above embodiments, comprising:

[0017] The energy acquisition module non-invasively inductively acquires power on the overhead line to generate an induced electromotive force, converts the induced electromotive force into direct current, and determines whether the induced electromotive force input by the energy acquisition module is greater than a first rated voltage;

[0018] If so, the protection circuit is activated, and the connection between the energy acquisition module and the discharge module is disconnected;

[0019] Based on the direct current output by the energy acquisition module, the discharge module outputs a charging voltage, and determines whether the charging voltage is less than a second rated voltage;

[0020] If so, start the time-sharing power supply circuit and use the power supply module to supply power to the subsequent load circuit interval at minimum power; if not, start the energy conditioning circuit and control the connection between the energy acquisition module and the power supply module according to the third rated voltage of the direct current.

[0021] The present invention further provides a micro-power consumption CT self-energy extraction device, comprising the micro-power consumption CT self-energy extraction circuit described in any one of the above embodiments.

[0022] Beneficial effects:

[0023] A micro-power consumption CT self-energy extraction circuit of the present invention comprises an energy extraction module, a discharge module, a power supply module and an energy consumption management module; the energy extraction module is used to non-invasively inductively extract power from an overhead line to generate an induced electromotive force, and convert the induced electromotive force into direct current; the discharge module is connected to the energy extraction module, and the discharge module is used to receive the direct current output by the energy extraction module and output a charging voltage; the power supply module is connected to the discharge module, and the power supply module is used to convert the charging voltage output by the discharge module into a low-voltage power supply and drive a subsequent load circuit; the energy consumption management module comprises a protection circuit, an energy conditioning circuit and a time-sharing power supply circuit, the protection circuit is connected to the energy extraction module, and the protection circuit is used to monitor the intensity of the induced electromotive force, and control the energy discharge and energy extraction input cut-off of the energy extraction module; the energy conditioning circuit is connected between the energy extraction module and the discharge module, and the energy conditioning circuit is used to control the discharge power of the energy extraction module; the time-sharing power supply circuit is respectively connected to the protection circuit and the power supply module, and the time-sharing power supply circuit is used to control the output power of the subsequent load circuit. Therefore, by integrating the protection circuit, energy conditioning circuit and time-sharing power supply circuit on the micro-power CT self-energy circuit, the micro-power CT self-energy circuit can integrate energy management modes such as maximum power energy extraction, adaptive low power output, and active protection, which is helpful to optimize the discharge power of the energy extraction module, achieve maximum power energy extraction, and improve energy conversion efficiency. In addition, the micro-power CT self-energy circuit can adaptively adjust the power extraction according to the changes in the grid current to ensure that the sensor device can be effectively powered under different working conditions, and intelligently adjust the power supply time according to the load demand and power supply status, optimize the distribution of electric energy, avoid invalid energy consumption, and extend the battery life. At the same time, it can monitor the intensity of the induced electromotive force in real time, and perform overload, short circuit and overheating protection in time, reduce the risk of device damage, improve the overall reliability of the micro-power CT self-energy circuit, and protect the circuit and subsequent loads from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an overall schematic diagram of a micro-power CT self-energy extraction circuit according to an embodiment of the present invention;

[0025] Figure 2 is an overall schematic diagram of a protection circuit according to an embodiment of the present invention;

[0026] Figure 3 It is an overall schematic diagram of a protection circuit and a dual-embedded voltage protection circuit according to an embodiment of the present invention;

[0027] Figure 4 It is an overall schematic diagram of a key node monitoring circuit according to an embodiment of the present invention;

[0028] Figure 5It is a flow chart of a micro-power CT self-energy extraction method according to an embodiment of the present invention.

[0029] in:

[0030] 1. Energy acquisition module; 2. Discharge module; 3. Key node monitoring circuit; 4. Busbar;

[0031] 10. Energy-collecting magnetic ring; C. Tuning capacitor; 11. Lightning protection component;

[0032] 40. Protection circuit; 41. Energy conditioning circuit;

[0033] 401, passive protection discharge circuit; 402, active protection discharge circuit; 403, dual embedded pressure protection circuit;

[0034] D1, first voltage zener diode; D2, second voltage zener diode; Q1, switch element; R3, third resistor; R4, fourth resistor;

[0035] R1, first resistor;

[0036] R2, second resistor; 60, operational amplifier.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] Reference Figure 1-Figure 3 , the present invention proposes a micro-power consumption CT self-energy extraction circuit, including an energy extraction module 1, a discharge module 2, a power supply module and an energy consumption management module;

[0043] The energy acquisition module 1 is used to non-invasively inductively acquire power from overhead lines to generate an induced electromotive force, and convert the induced electromotive force into direct current;

[0044] The discharge module 2 is connected to the energy acquisition module 1, and is used to receive the direct current output by the energy acquisition module 1 and output a charging voltage;

[0045] The power supply module is connected to the discharge module 2, and is used to convert the charging voltage output by the discharge module 2 into a low-voltage power supply and drive a subsequent load circuit;

[0046] The energy consumption management module includes a protection circuit 40, an energy conditioning circuit 41 and a time-sharing power supply circuit. The protection circuit 40 is connected to the energy acquisition module 1, and the protection circuit 40 is used to monitor the intensity of the induced electromotive force and control the energy discharge and energy input cut-off of the energy acquisition module 1; the energy conditioning circuit 41 is connected between the energy acquisition module 1 and the discharge module 2, and the energy conditioning circuit 41 is used to control the discharge power of the energy acquisition module 1; the time-sharing power supply circuit is respectively connected to the protection circuit 40 and the power supply module, and the time-sharing power supply circuit is used to control the output power of the subsequent load circuit.

[0047] In the above embodiment, the micro-power consumption CT self-energy extraction circuit includes an energy extraction module 1, a discharge module 2, a power supply module and an energy consumption management module, wherein the energy extraction module 1 is placed near the high-voltage overhead line, so that the energy extraction module 1 can non-invasively inductively extract power from the busbar 4 of the overhead line to generate an induced electromotive force, wherein the induced electromotive force is in the form of AC, and the energy extraction module 1 converts the induced electromotive force into direct current. The energy extraction module 1 does not directly contact the high-voltage line, thus avoiding physical intervention in the line and reducing interference with the existing power system. In addition, by converting the induced electromotive force into direct current, it can be directly used in most electronic devices and sensors without additional The external converter improves the efficiency of energy conversion; the discharge module 2 is connected to the energy acquisition module 1, and the discharge module 2 is mainly used to receive the DC power output by the energy acquisition module 1 and output the DC power as a stable charging voltage. The discharge module 2 can adapt the DC power generated by the energy acquisition module 1 to the charging voltage required by the energy storage device (such as a battery or a supercapacitor) to ensure effective energy storage, and through the voltage stabilization function of the discharge module 2, it can ensure that the voltage provided to the energy storage device is within a safe and recommended range to avoid damage to the device caused by excessively high or low voltage; the power supply module is connected to the discharge module 2, and the power supply module is mainly used to output the DC power from the discharge module 2. The charging voltage output is converted into a stable low-voltage power supply, and the power supply module drives the subsequent sensor device equipped with the subsequent load circuit. The power supply module can convert the charging voltage into the low-voltage power supply required by the specific subsequent sensor device to ensure that the sensor works at the optimal voltage, and the power supply module can adjust the output voltage and current according to different subsequent load requirements to adapt to various sensor devices; in addition, the energy consumption management module includes a protection circuit 40, an energy conditioning circuit 41 and a time-sharing power supply circuit, wherein the protection circuit 40 is connected to the energy acquisition module 1, and the protection circuit 40 is used to monitor the intensity of the induced electromotive force, and control the energy discharge and The energy input is cut off, and the protection circuit 40 can monitor the induced electromotive force. When an excessively high voltage is detected, the energy can be discharged in time or the input can be cut off to prevent the entire micro-power CT self-energy circuit from being damaged; the energy conditioning circuit 41 is connected between the energy acquisition module 1 and the discharge module 2, and the energy conditioning circuit 41 is used to dynamically control the discharge power of the energy acquisition module 1. By dynamically adjusting the discharge power, the energy conditioning circuit 41 enables the entire micro-power CT self-energy circuit to adapt to different grid conditions and load requirements, and by accurately controlling the discharge power, the loss in the energy conversion process is reduced, thereby improving the overall energy efficiency of the entire micro-power CT self-energy circuit;The time-sharing power supply circuit is connected to the protection circuit 40 and the power supply module respectively. The time-sharing power supply circuit is used to control the output power of the subsequent load circuit, so that the time-sharing power supply circuit can adjust the power supply according to the actual working requirements of the load, avoid ineffective energy consumption, and improve the overall energy efficiency. By controlling the output power of the subsequent load circuit, the time-sharing power supply circuit can more effectively manage the power distribution of multiple loads. Therefore, by integrating the protection circuit 40, the energy conditioning circuit 41 and the time-sharing power supply circuit on the micro-power CT self-power supply circuit, the micro-power CT self-power supply circuit can realize maximum power energy extraction, adaptive low power output, active protection and other energy consumption management modes. The integrated use of the lines helps to optimize the discharge power of the energy extraction module 1, achieve maximum power extraction, and improve energy conversion efficiency. In addition, the micro-power CT self-energy extraction circuit can adaptively adjust the power extraction according to the change of the grid current, ensuring that the sensor device can be effectively powered under different working conditions, and intelligently adjust the power supply time according to the load demand and power supply status, optimize the power distribution, avoid ineffective energy consumption, and extend the battery life. At the same time, it can monitor the intensity of the induced electromotive force in real time, and timely perform overload, short circuit and overheating protection, reduce the risk of device damage, improve the overall reliability of the micro-power CT self-energy extraction circuit, and protect the circuit 40 and the subsequent load from damage. ;

[0048] Reference Figure 1 In one embodiment, the energy harvesting module 1 includes an energy harvesting magnetic ring 10, a tuning capacitor C, a lightning protection device 11 and a rectifier bridge. The energy harvesting magnetic ring 10 is arranged on the overhead line, and the tuning capacitor C, the lightning protection device 11 and the rectifier bridge are respectively connected in parallel with the energy harvesting magnetic ring 10.

[0049] In the above embodiment, the energy collection module 1 includes an energy collection magnetic ring 10, a tuning capacitor C, a lightning protection device 11 and a rectifier bridge, wherein the energy collection magnetic ring 10 is arranged on the overhead line, so that the energy collection magnetic ring 10 completes the induction self-power collection process on the overhead line, and the change of the conductor current on the overhead line causes the magnetic field change of the energy collection magnetic ring 10. The energy collection magnetic ring 10 uses a Permalloy core to induce a magnetic field, collects and concentrates it inside the magnetic ring, and generates an obvious magnetic flux change in the energy collection magnetic ring 10, and then the induced electromotive force generated in the energy collection magnetic ring 10 is input into the energy collection module 1, thereby realizing electric energy collection. The energy magnetic ring 10 is set up in a non-invasive manner, so that the energy magnetic ring 10 does not need to contact or change the existing overhead line structure, ensuring that the energy magnetic ring 10 is easy to install and does not affect the normal operation of the line. In addition, the circular design of the energy magnetic ring 10 helps to concentrate the change of magnetic flux, increase the magnetic induction intensity, and thus increase the amplitude of the induced electromotive force; the tuning capacitor C is connected in parallel with the energy magnetic ring 10, and its tuning capacitor C is preferably two groups connected to the induced electromotive force line of the energy magnetic ring 10, and the capacitance value of the tuning capacitor C is set to match the inductance value of the energy magnetic ring 10 to form a tuning circuit. The tuning circuit can selectively receive electromagnetic waves of a specific frequency, thereby improving the energy collection efficiency; considering that outdoor overhead lines may be struck by lightning, a lightning protection component 11 is integrated in the energy collection module 1, and the lightning protection component 11 includes but is not limited to ceramic detonators, gas discharge tubes or varistors. The energy collection magnetic ring 10 is connected in parallel at both ends of the energy collection magnetic ring 10. When the lightning current passes through the wire, the voltage amplitude collected from the wire by the energy collection magnetic ring 10 will be greater than 75V, breaking through the threshold to break down the detonator, and the detonator is turned on, short-circuiting the energy collection coil, thereby realizing lightning protection for the device. Therefore, when an excessively high voltage is detected, the lightning protection component 11 will be turned on, directing the overvoltage to the ground, and protecting the energy collection module 1 from damage; the rectifier bridge is also connected in parallel with the energy collection magnetic ring 10, and its function is to convert the AC electromotive force output by the tuning circuit into DC power, and its rectifier The flow bridge is preferably a TTR8MF rectifier bridge, which is a full rectifier bridge based on the rectifier bridge principle, and converts the induced electromotive force into a unidirectional DC discharge voltage Vin throughout the cycle, wherein Vin is a voltage self-monitoring point located between the energy acquisition module 1 and the discharge module 2, so that the discharge voltage Vin subsequently enters the discharge module 2. The rectifier bridge has the function of reducing ripples, and can effectively suppress the ripples of the output DC power. Ripple is the AC component in DC power. Excessive ripples will affect the performance and life of the entire micro-power CT self-energy circuit. Reducing ripples helps to improve the stability and reliability of the micro-power CT self-energy circuit, and by reducing ripples, the rectifier bridge can provide smoother and cleaner DC power, thereby improving the power quality of the entire micro-power CT self-energy circuit, effectively utilizing the positive and negative half-cycles of the AC signal, and improving the energy conversion efficiency.

[0050] Reference Figure 1In one embodiment, the discharge module 2 includes a voltage stabilizing circuit, a charging circuit and an energy storage circuit, a first end of the voltage stabilizing circuit is connected to the rectifier bridge, a first end of the charging circuit is connected to the second end of the voltage stabilizing circuit, a first end of the energy storage circuit is connected to the second end of the charging circuit, and the energy storage circuit is used to store electrical energy in a battery.

[0051] In the above embodiment, the discharge module 2 performs voltage stabilization, filtering, noise reduction and other operations on the DC power input by the energy acquisition module 1, and finally outputs a stable charging voltage Vout that can be used to charge the battery, wherein Vout is a voltage self-monitoring point located between the discharge module 2 and the power supply module, and the electric energy collected by the energy acquisition module 1 is stored in the battery. The discharge module 2 includes a voltage stabilization circuit, a charging circuit and an energy storage circuit, wherein the first end of the voltage stabilization circuit is connected to the output end of the rectifier bridge, for receiving the rectified DC power, and stabilizing the input voltage, filtering the ripple, and controlling the output power, and The discharge voltage Vin is converted into a stable output, pure direct current, and because the discharge voltage Vin still has certain fluctuations, it is necessary to eliminate the input voltage fluctuations, and output a constant voltage drive circuit after voltage stabilization. The voltage stabilization circuit samples the output voltage through the sampling circuit inside the chip, and compares the sampled voltage with the reference voltage. By using the amplifier circuit as a feedback loop, the output voltage stability is dynamically adjusted, so that no matter whether the input voltage fluctuates or the subsequent load changes, the voltage stabilization circuit can maintain a constant output voltage to supply power to the charging circuit. The voltage stabilization circuit can eliminate the fluctuation of the input voltage and output a constant voltage, effectively improving The invention improves the stability of the subsequent load circuit, and filters out the ripple component of the rectified DC bridge to provide smoother DC power, thereby reducing the noise and interference in the entire micro-power CT self-energy extraction circuit; the first end of the charging circuit is connected to the second end of the voltage stabilizing circuit to receive the regulated DC power, and the charging circuit includes a charging manager, which has a chip with fast charging input and switch mode charging management functions, and charges the battery under different voltage and current conditions, wherein the chip controls the on and off of the internal MOSFET to convert the multi-level input voltage into a voltage suitable for battery charging, so that the charging current and voltage can be adjusted according to the charging state of the battery to achieve an efficient and safe charging process; the first end of the energy storage circuit is connected to the second end of the charging circuit to receive the charged DC power, and the energy storage circuit is used to store electric energy in the battery, so that during the peak period of the power grid, the energy storage circuit can provide additional electric energy to reduce the pressure on the power grid, and by storing electric energy when the power demand is low and using it during peak hours, the energy utilization efficiency of the entire micro-power CT self-energy extraction circuit can be improved, wherein the battery adopts a wide temperature range, high density, lithium-ion supercapacitor (Lithium-ion Capacitor, LIC), and a supercapacitor battery charge and discharge balancing circuit is arranged outside the battery, which actively discharges the unequal voltage on both sides of the battery through the supercapacitor battery charge and discharge balancing circuit, thereby improving the long-flight working ability of the battery under backup power, helping to optimize the battery charge and discharge process, reduce energy loss, and improve the overall energy conversion efficiency. In addition, by maintaining the balance of the internal voltage of the battery, the battery aging caused by uneven voltage can be reduced, thereby extending the battery life.

[0052] Furthermore, the power supply module is mainly composed of a DC-DC (Direct Current to Direct Current) step-down circuit, which is used to convert a DC voltage higher than 5V into a stable 5V DC voltage output, ensuring that the output voltage matches the operating voltage requirements of the subsequent sensor device and electronic components, avoiding damage to the subsequent sensor device caused by voltage mismatch, and providing a stable 5V output, reducing the impact of voltage fluctuations on sensitive electronic components in the subsequent sensor device, ensuring the normal operation of the subsequent sensor device, and through the built-in feedback control loop of the DC-DC step-down circuit, it can monitor the output voltage, and ensure output stability by automatically adjusting the switching frequency and duty cycle, and can provide stable power supply to the main control chip and core electronic components of the subsequent sensor device, thereby improving the energy efficiency of the entire DC-DC step-down circuit and reducing energy loss.

[0053] Reference Figure 1-Figure 4 In one embodiment, the micro-power consumption CT self-energy extraction circuit also includes a power management unit, which is respectively connected to the protection circuit 40 and the time-sharing power supply circuit, and the power management unit is used to monitor the energy extraction voltage and input voltage of the energy extraction module 1, and the charging voltage of the discharge module 2.

[0054] In the above embodiment, the micro-power CT self-power circuit further includes a power management unit, wherein the power management unit serves as the control center of the entire micro-power CT self-power circuit, and the input end of the power management unit is connected to the output end of the protection circuit 40 to monitor the induced electromotive force and input voltage generated by the energy acquisition module 1, wherein the power management unit is preferably a power management MCU (Microcontroller Unit), connect the other end of the power management unit to the time-sharing power supply circuit to control the output power of the subsequent load circuit, integrate a voltage monitoring circuit in the power management unit, and monitor the energy-taking voltage of the energy-taking module 1 and the charging voltage of the discharge module 2 in real time. The power management unit determines the current size of the bus 4 on the external overhead line and the health of the circuit by monitoring the energy-taking voltage, input voltage, and charging voltage information, and finally realizes that the micro-power CT self-energy-taking circuit can take power with high performance under any working condition of the conductor, effectively prevent under the fault current of the conductor, and operate with low power consumption under the weak current of the conductor. The power management unit can monitor the energy-taking voltage, input voltage, and charging voltage in real time to ensure an accurate understanding of the circuit state. According to the monitored voltage information, the energy-taking and power supply strategies are intelligently adjusted to optimize the circuit performance, and the working mode can be adaptively adjusted under different bus 4 current sizes and circuit health levels to achieve high-performance power taking and improve energy acquisition efficiency.

[0055] Reference Figure 1-Figure 2In one embodiment, the protection circuit 40 includes a passive protection discharge circuit 401, an active protection discharge circuit 402 and a dual embedded voltage protection circuit 403, and the power management unit; the passive protection discharge circuit 401 is connected in parallel with the energy extraction magnetic ring 10; the first end of the active protection discharge circuit 402 is connected to the passive protection discharge circuit 401, and the second end of the active protection discharge circuit 402 is connected to the power management unit; the dual embedded voltage protection circuit 403 is connected between the energy extraction module 1 and the discharge module 2.

[0056] In the above embodiment, the protection circuit 40 includes a passive protection discharge circuit 401, an active protection discharge circuit 402 and a dual embedded voltage protection circuit 403, so that the protection circuit 40 can realize active monitoring of external risks, active discharge of large electric energy, and accurate disconnection of internal circuit electrical connections through a triple circuit protection mechanism. When the primary bus 4 causes current fluctuations due to lightning strikes or faults, the magnetic flux in the energy-taking magnetic ring 10 increases accordingly, so that a huge induced electromotive force will be generated on the energy-taking magnetic ring 10. The power management unit monitors the input AC voltage to determine whether there is a large current threat outside, and then uses the triple protection circuit 40 to discharge electric energy and cut off the energy input, thereby realizing reliable protection, and realizing multiple faults on the bus 4 through the protection line. The passive protection function makes the entire micro-power consumption CT self-energy-taking circuit suitable for reliable power taking of high-voltage overhead lines; the passive protection discharge circuit 401 is connected in parallel with the energy-taking magnetic ring 10, wherein the passive protection discharge circuit 401 is used as the first-level protection circuit 40, and the large current is controlled by the thyristor to switch on and off, and the electric energy is discharged by the heat of the resistor. When the AC voltage amplitude of the input induced electromotive force is greater than 35V, a sufficiently large voltage flows through the anode and cathode of the thyristor, turning on the thyristor, and guiding the current to flow through the resistor for discharge. The passive protection discharge circuit 401 does not need to be controlled by the power management unit. When the input voltage is large, the passive protection discharge circuit 401 automatically discharges the electric energy. Since the real-time control of the power management unit is not required, the passive protection discharge circuit 401 can be reduced. The calculation and control burden on the power management unit is reduced, and the excess electric energy is discharged by heating the resistor, converting the electric energy into heat energy, reducing the impact on the circuit. At the same time, due to its self-triggering characteristics, the passive protection discharge circuit 401 reduces the demand and intervention of maintenance personnel; the first end of the active protection discharge circuit 402 is connected to the passive protection discharge circuit 401, and the second end of the active protection discharge circuit 402 is connected to the power management unit, wherein the active protection discharge circuit 402 serves as the second-level protection circuit 40. When the power management unit detects that the input energy is too large, the protection circuit 40 is actively started, and is composed of a solid-state relay, a transient suppression diode, and a resistor. When the power management unit detects that the input induced electromotive force is When the AC voltage amplitude is greater than 40V, the solid-state relay turns on the connection between the transient suppression diode and the resistor, directs the electrical energy into the resistor and converts it into heat energy, discharges the excess electrical energy, and protects the safety of the subsequent load circuit. The power management unit can monitor the circuit status in real time and actively start protection measures when necessary to provide intelligent protection. Through the precise control of the power management unit, it can implement appropriate discharge strategies for different overvoltage conditions to avoid excessive or insufficient discharge, discharge excess electrical energy in time, protect the subsequent load circuit from damage, and ensure stable operation of the system. At the same time, the fast response and discharge capabilities help reduce the downtime of the entire micro-power CT self-energy circuit due to overvoltage;In addition, the dual-embedded voltage protection circuit 403 is connected between the energy acquisition module 1 and the discharge module 2, wherein the dual-embedded voltage protection circuit 403 serves as the third-level protection circuit 40. The dual-embedded voltage protection circuit 403 is the last insurance when both the active discharge protection circuit 40 and the passive discharge protection circuit 40 fail and large electric energy is about to enter the discharge module 2. When both the active discharge protection circuit 40 and the passive protection discharge circuit 401 fail to effectively discharge the excess electric energy, the dual-embedded voltage protection circuit 403 serves as the last line of defense to prevent large electric energy from entering the discharge module 2, providing additional safety protection for the discharge module 2 and the connected power supply module, avoiding damage caused by high voltage shock, and improving the service life of the entire micro-power CT self-energy extraction circuit. ;

[0057] Reference Figure 1-Figure 3 In one embodiment, the dual embedded voltage protection circuit 403 includes a first Zener diode D1 and a second Zener diode D2 connected in parallel with the first Zener diode D1, a first end of the first Zener diode D1 and a first end of the second Zener diode D2 are respectively connected to the rectifier bridge and the voltage stabilizing circuit, a second end of the first Zener diode D1 and a second end of the second Zener diode D2 are respectively grounded, and a switch element Q1 is provided between the first end of the first Zener diode D1 and the first end of the second Zener diode D2.

[0058] In the above embodiment, the dual embedded voltage protection circuit 403 includes two parallel-connected Zener diodes, namely a first Zener diode D1 and a second Zener diode D2, wherein the first end of the first Zener diode D1 is respectively connected to the output end of the rectifier bridge and the input end of the voltage stabilizing circuit, and the first end of the second Zener diode D2 is respectively connected to the output end of the rectifier bridge and the input end of the voltage stabilizing circuit. The two parallel first Zener diodes D1 and the second Zener diode D2 provide a dual protection mechanism, which increases the safety of the circuit. If one Zener diode fails, the other can continue to work, providing redundant protection and improving the reliability of the system. At the same time, the first Zener diode D1 and the second Zener diode D2 connected in parallel can jointly carry a larger current, thereby improving the power handling capacity of the entire protection circuit 40. In addition, the second end of the first Zener diode D1 and the second end of the second Zener diode D2 are grounded respectively, and a plurality of third resistors R3 are arranged on the line between the second end of the first Zener diode D1 and the ground, and a plurality of fourth resistors R4 are arranged on the line between the second end of the second Zener diode D2 and the ground, and the plurality of third resistors R3 and the plurality of fourth resistors R4 can disperse the first Zener diode D1 and The heat generated by the second Zener diode D2 in the reverse breakdown state reduces the heat load of a single resistor, thereby reducing the overall temperature, and the resistor can work together with the Zener diode to provide a more stable voltage discharge path and reduce voltage fluctuations. In addition, a switch element Q1 is provided between the first end of the first Zener diode D1 and the first end of the second Zener diode D2, wherein the switch element Q1 is a MOS (MOSFET) switch. When the input DC discharge voltage Vin>65V, which exceeds the threshold of the first Zener diode D1, the first Zener diode D1 drives the diode to turn on, and the energy extraction module is turned off. The switch Q1 between the energy taking module 1 and the discharge module 2 waits for the voltage to drop before starting again; when the input DC discharge voltage Vin>91V, which exceeds the threshold of the second voltage stabilizing diode D2, the second voltage stabilizing diode D2 drives the diode to conduct, completely shuts off the connection between the energy taking module 1 and the discharge module 2, and discharges the electric energy, thereby protecting the subsequent load circuit from being damaged by the large voltage. By setting different thresholds, the conduction and shutdown of the switch Q1 can be accurately controlled to achieve hierarchical protection, and by timely cutting off the overvoltage, the subsequent load circuit is protected from damage, thereby improving the safety of the entire micro-power CT self-energy taking circuit.

[0059] Reference Figure 1-Figure 3 In one embodiment, the energy conditioning circuit 41 includes a Schmitt trigger and a first resistor R1, the first end of the Schmitt trigger is connected to the rectifier bridge, the second end of the Schmitt trigger is connected to the dual-embedded voltage protection circuit 403, the first end of the first resistor R1 is connected to the Schmitt trigger, and the second end of the first resistor R1 is grounded.

[0060] In the above embodiment, the energy conditioning circuit 41 includes a Schmitt trigger and a first resistor R1. The first terminal of the Schmitt trigger is connected to the output terminal of the rectifier bridge to receive the rectified DC voltage signal. The second terminal of the Schmitt trigger is connected to the double clamping protection circuit 403 for receiving the status feedback or control signal of the protection circuit 40. The first terminal of the first resistor R1 is connected to the Schmitt trigger to limit the current flowing into the Schmitt trigger and provide appropriate voltage division for the signal. The second terminal of the first resistor R1 is grounded to provide a stable reference potential for the circuit. By using the hysteresis characteristic of the Schmitt trigger, the voltage signal output by the rectifier bridge is shaped and stabilized to facilitate the stable operation of the subsequent circuit. In addition, according to the output signal of the Schmitt trigger, the control logic of the double clamping protection circuit 403 is realized, such as the switching of the switch state. By controlling the opening and closing between the energy harvesting module 1 and the discharge module 2, the discharge voltage Vin is dynamically adjusted to always be in the maximum discharge power working range, and the energy harvesting magnetic core 10 is controlled to output the maximum discharge power. The energy conditioning circuit 41 uses the Schmitt trigger to build a hysteresis comparator. According to the relationship between the energy harvesting power of the energy harvesting magnetic core 10 and the discharge voltage Vin, the upper and lower voltage thresholds V1 and V2 are set to judge the interval of the discharge voltage Vin. When Vin > V1, the Schmitt trigger outputs a high level to start the connection with the discharge module 2; when Vin < V1, the Schmitt trigger outputs a low level to turn off the discharge module 2.Thus, it is realized that the power-taking module 1 and the discharging module 2 can be normally turned on only when the discharging voltage Vin is within the interval [V1, V2], and high-power discharging can be achieved. By dynamically adjusting the discharging voltage Vin, it is ensured that the power-taking module 1 operates within the maximum discharging power working interval, improving the energy conversion efficiency. At the same time, the discharging voltage Vin is maintained within a safe interval, reducing the impact of voltage fluctuations on the subsequent circuit and improving the stability of the micro-power CT self-powered circuit. The interval [V1, V2] is preferably [16V, 18V]. When Vin > 18V, the power-taking power of the power-taking magnetic core 10 starts to decline at this time. The energy conditioning circuit 41 actively controls the conduction of the power-taking module 1 and the discharging module 2, discharges the collected electric energy into the discharging module 2, and controls the discharging voltage Vin to drop below 18V to increase the discharging power. When 16V < Vin < 18V, the discharging power P = I*V of the power-taking magnetic core 10 has a maximum output power point at this time. The power-taking magnetic core 10 outputs the maximum discharging power to the power-taking module 1, making the overall power-taking device have the fastest charging speed. When Vin < 16V, the power-taking efficiency of the power-taking magnetic core 10 decreases. The Schmitt trigger in the energy conditioning circuit 41 turns off the electrical connection between the power-taking module and the discharging module 2, accumulates the electric energy in the discharging capacitor, and waits until the energy accumulates enough for the discharging voltage Vin to climb back to 18V again, and then turns on the discharging module 2 again. By controlling charging and discharging, the discharging voltage is dynamically adjusted to work within the maximum discharging interval [16V, 18V]. Through the dynamic control of the energy conditioning circuit 41, the discharging voltage Vin always works within the maximum discharging interval, improving the overall energy efficiency of the system. At the same time, by maintaining the discharging voltage within the optimal interval, unnecessary charge and discharge cycles of the energy storage device are reduced, and its service life is extended.

[0061] Furthermore, when the power management unit detects that the charging voltage Vout is less than 12V, it determines that the current of the primary bus 4 is extremely small, usually weaker than 10A, and the power supply energy is too low, the bus 4 voltage is difficult to maintain the operation of the energy supply module 1 and the rear sensor device. The power management unit will start the time-sharing power supply circuit, in which the power supply of the main control chip of the rear load circuit is supplied by the DC-DC step-down circuit. The first end of the time-sharing power supply circuit is connected to the power management unit, and the second end of the time-sharing power supply circuit is connected to the DC-DC step-down circuit, so that the DC-DC step-down circuit reduces the direct current to the required voltage of the chip, processor and other electronic components. The working voltage is a stable 5V DC output, and the DC-DC step-down circuit has the function of self-monitoring the output voltage. When the load changes or the input voltage fluctuates, the switching frequency and duty cycle are automatically adjusted to maintain the stability of the output voltage. When the current of bus 4 is extremely small and the power supply energy is too low, low-power operation can be achieved through the time-sharing power supply circuit, and the operating time limit of the micro-power CT self-energy circuit is extended. The power management unit intelligently judges the power status according to the real-time monitoring data and starts the corresponding power supply strategy. Even when the input voltage is low, the DC-DC step-down circuit can still provide a stable 5V output to ensure the normal operation of key electronic components.

[0062] Reference Figure 1-Figure 4 In one embodiment, the micro-power consumption CT self-energy extraction circuit also includes a key node monitoring circuit 3, and the key node monitoring circuit 3 includes a second resistor R2 and an operational amplifier 60, the first end of the second resistor R2 is connected to the switch element Q1, the second end of the second resistor R2 is grounded, the first end of the operational amplifier 60 is connected to the second end of the second resistor R2 and the grounded line, and the second end of the operational amplifier 60 is connected to the power management unit.

[0063] In the above embodiment, the micro-power CT self-energy extraction circuit also includes a key node monitoring circuit 3, which includes a second resistor R2 and an operational amplifier 60. The first end of the second resistor R2 is connected to the switch element Q1 to monitor the on and off states of the switch element Q1. The second end of the second resistor R2 is grounded to provide a stable reference potential for the monitoring circuit. The operational amplifier 60 is preferably an operational amplifier 60 with high input impedance to reduce the load effect on the monitoring point. The first end of the operational amplifier 60 (positive input voltage (Non-Inverting Input Voltage) pin, VIN+) is connected to the second end of the second resistor R2 and the grounded line to form a voltage divider. The second end of the operational amplifier 60 (negative input voltage (Inverting Input Voltage) pin, VIN-) is connected to the power management unit to transmit the monitored voltage signal to the power management unit. The voltage signal on the second resistor R2 is amplified by the operational amplifier 60 so that it can be accurately read by the power management unit. In addition, the third end of the operational amplifier 60 (output voltage (Output The power supply voltage (Supply Voltage) pin, VOUT) is connected to the second end of the operational amplifier 60 and the grounded line, and the fourth end of the operational amplifier 60 (the supply voltage (Supply Voltage) pin, VS) is grounded. Through the operational amplifier 60 and the second resistor R2, the abnormal heating of the switch element Q1 is effectively monitored. Since the switch element Q1 passes a large voltage, there is a risk of failure. A key node monitoring circuit 3 is set next to the switch element Q1. When the abnormal heating of the switch element Q1 is monitored, the power management unit can actively cut off the circuit in time, thereby realizing self-monitoring of the key nodes of the circuit, effectively improving the reliability and stability of the entire micro-power CT self-energy extraction circuit. In addition, when an abnormal situation is monitored, the circuit can be actively cut off in time to prevent the fault from expanding, avoid abnormal heating of the switch element Q1, reduce the wear of the micro-power CT self-energy extraction circuit, and extend the service life of the micro-power CT self-energy extraction circuit.

[0064] Reference Figure 1-Figure 5 The present invention further proposes a micro-power CT self-power extraction method, which is applied to the micro-power CT self-power extraction circuit described in any of the above embodiments, comprising:

[0065] S1: the energy acquisition module 1 non-invasively inductively acquires power on the overhead line to generate an induced electromotive force, converts the induced electromotive force into direct current, and determines whether the induced electromotive force input by the energy acquisition module 1 is greater than a first rated voltage;

[0066] S2: If yes, start the protection circuit 40 and disconnect the energy acquisition module 1 from the discharge module 2;

[0067] S3: Based on the direct current output by the energy acquisition module 1, the discharge module 2 outputs a charging voltage, and determines whether the charging voltage is less than a second rated voltage;

[0068] S4: If yes, start the time-sharing power supply circuit, and use the power supply module to supply power to the subsequent load circuit interval at minimum power; if no, start the energy conditioning circuit 41, and control the connection between the energy acquisition module 1 and the power supply module according to the third rated voltage of the DC power.

[0069] In the above embodiment, the micro-power CT self-energy extraction method is mainly applied to the micro-power CT self-energy extraction circuit. The energy extraction module 1 is installed at an appropriate position of the overhead line to ensure that it can sense sufficient electromotive force while avoiding any interference or damage to the line. The induction coil in the energy extraction module 1 is used to induce the AC electric field or magnetic field on the overhead line to generate an AC electromotive force. The induced AC electromotive force is converted into DC power through a rectifier bridge. A voltage monitoring circuit is connected to the output end of the rectifier bridge. According to design requirements and safety standards, a first rated voltage is set for the DC voltage output by the induced electromotive force, wherein the voltage value of the first rated voltage is preferably 65V, which is used as a threshold for judging overvoltage protection. The voltage monitoring circuit monitors the rectified DC voltage in real time and compares it with the first rated voltage. If the monitored DC voltage is greater than 65V, the voltage monitoring circuit will generate a control signal to indicate an overvoltage condition. The overvoltage signal from the voltage monitoring circuit is received by the power management unit. The control logic inside the power management unit determines whether the conditions for starting the protection circuit 40 are met based on the received signal. After confirming that the conditions are met, the power management unit sends an activation signal to the protection circuit 40. The protection circuit 40 controls the switch Q1 to disconnect the energy taking module 1 from the discharge module 2, stop energy transmission, and stop the power taking and power supply operations of the entire micro-power CT self-energy taking circuit to prevent the voltage from being too high and causing The discharge module 2 receives the DC power from the energy taking module 1, and the voltage stabilizing circuit inside the discharge module 2 converts the received DC power into a charging voltage suitable for the energy storage device (such as a battery or a super capacitor). The voltage monitoring circuit is connected to the charging voltage Vout output terminal of the discharge module 2 to monitor the charging voltage in real time. According to the design requirements of the discharge module 2 and the energy storage device, a second rated voltage is set in the charging voltage as a threshold for low voltage protection, wherein the voltage value of the second rated voltage is preferably 12V. The voltage monitoring circuit monitors the charging voltage in real time and compares it with the second rated voltage. If the monitored charging voltage is less than the second rated voltage, the voltage monitoring circuit will generate a control signal. Indicates that the voltage is too low, and the control signal will be sent to the power management unit. The power management unit determines whether it is necessary to start the time-sharing power supply circuit or other protection measures based on the signal; if the charging voltage is less than the second rated voltage, the power management unit starts the time-sharing power supply circuit, and the time-sharing power supply circuit controls the power supply module to operate at the minimum power, provides interval power supply for the subsequent load circuit, sets the power supply interval time, and adjusts the power supply frequency and duration according to system requirements and energy consumption management strategies. During the power supply interval, when the charging voltage Vout recovers to about 12V, the power management unit turns on the discharge module 2 to power the subsequent load circuit, and the power supply module provides the necessary power for the subsequent load circuit to maintain its basic operation;If the charging voltage is greater than or equal to the second rated voltage, the power management unit starts the energy conditioning circuit 41, and then the DC power output by the energy acquisition module 1 controls the connection between the energy acquisition module 1 and the power supply module, and sets a third rated voltage in the DC power, wherein the third rated voltage includes a fourth rated voltage and a fifth rated voltage monitored by the power management unit at the output end of the energy acquisition module 1, wherein the voltage value of the fourth rated voltage is preferably 16V, and the voltage value of the fifth rated voltage is preferably 18V. When the discharge voltage Vin of the DC power output by the energy acquisition module 1 is greater than the voltage value of the fourth rated voltage, as a condition for high-power power acquisition, the energy acquisition module 1 turns on the discharge module 2 so that the energy acquisition module 1 can draw electricity at the maximum power. When the discharge voltage Vin of the DC power output by the energy acquisition module 1 is between 16V and 18V, the energy acquisition magnetic ring 10 outputs the maximum discharge power to the energy acquisition module 1, so that the energy acquisition module 1 can achieve the fastest charging speed. When the discharge voltage Vin of the DC power output by the energy acquisition module 1 is less than 16V, the energy acquisition module 1 draws electricity at the maximum power. By shutting off the electrical connection between the power acquisition module and the discharge module 2, electric energy is accumulated to improve the energy acquisition efficiency. Through the sophisticated energy management and protection mechanism, the efficient, safe and stable operation of the entire micro-power CT self-energy acquisition circuit is ensured. ;

[0070] The present invention further provides a micro-power consumption CT self-energy extraction device, comprising the micro-power consumption CT self-energy extraction circuit described in any one of the above embodiments.

[0071] In the above embodiment, the micro-power CT self-energy device includes a micro-power CT self-energy circuit, through which energy can be obtained from the surrounding environment of the high-voltage overhead line, reducing dependence on external power supplies, and achieving energy self-sufficiency. By optimizing energy management and protection mechanisms, the service life of the micro-power CT self-energy device and the subsequent sensor device is extended, the dependence on traditional power supplies is reduced, and the long-term maintenance and operating costs are reduced. At the same time, the integrated multi-layer protection mechanism ensures the safe operation of the micro-power CT self-energy device under abnormal voltage conditions.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A micro-power CT self-powered circuit, characterized in that: It includes energy acquisition module, discharge module, power supply module and energy consumption management module; The energy acquisition module is used to non-invasively inductively acquire power from the overhead line to generate an induced electromotive force, and convert the induced electromotive force into direct current; The discharge module is connected to the energy acquisition module, and is used to receive the direct current output by the energy acquisition module and output a charging voltage; The power supply module is connected to the discharge module, and is used to convert the charging voltage output by the discharge module into low-voltage power supply and drive the subsequent load circuit; The energy consumption management module includes a protection circuit, an energy conditioning circuit and a time-sharing power supply circuit. The protection circuit is connected to the energy acquisition module, and is used to monitor the intensity of the induced electromotive force and control the energy discharge and energy input cut-off of the energy acquisition module; the energy conditioning circuit is connected between the energy acquisition module and the discharge module, and is used to control the discharge power of the energy acquisition module; the time-sharing power supply circuit is respectively connected to the protection circuit and the power supply module, and is used to control the output power of the subsequent load circuit.

2. The micro-power consumption CT self-energy extraction circuit according to claim 1 is characterized in that: The energy acquisition module includes an energy acquisition magnetic ring, a tuning capacitor, a lightning protection device and a rectifier bridge. The energy acquisition magnetic ring is arranged on the overhead line. The tuning capacitor, the lightning protection device and the rectifier bridge are respectively connected in parallel with the energy acquisition magnetic ring.

3. The micro-power consumption CT self-energy extraction circuit according to claim 2 is characterized in that: The discharge module includes a voltage stabilizing circuit, a charging circuit and an energy storage circuit, wherein a first end of the voltage stabilizing circuit is connected to the rectifier bridge, a first end of the charging circuit is connected to a second end of the voltage stabilizing circuit, a first end of the energy storage circuit is connected to a second end of the charging circuit, and the energy storage circuit is used to store electrical energy in a battery.

4. The micro-power consumption CT self-energy extraction circuit according to claim 3 is characterized in that: The micro-power consumption CT self-energy extraction circuit also includes a power management unit, which is respectively connected to the protection circuit and the time-sharing power supply circuit, and is used to monitor the energy extraction voltage and input voltage of the energy extraction module, and the charging voltage of the discharge module.

5. The micro-power consumption CT self-energy extraction circuit according to claim 4 is characterized in that: The protection circuit includes a passive protection discharge circuit, an active protection discharge circuit and a dual embedded voltage protection circuit, and the power management unit; The passive protection discharge circuit is connected in parallel with the energy extraction magnetic ring; the first end of the active protection discharge circuit is connected to the passive protection discharge circuit, and the second end of the active protection discharge circuit is connected to the power management unit; the dual embedded voltage protection circuit is connected between the energy extraction module and the discharge module.

6. The micro-power consumption CT self-energy extraction circuit according to claim 5, characterized in that: The dual embedded voltage protection circuit includes a first zener diode and a second zener diode connected in parallel with the first zener diode, the first end of the first zener diode and the first end of the second zener diode are respectively connected to the rectifier bridge and the zener circuit, the second end of the first zener diode and the second end of the second zener diode are respectively grounded, and a switch is provided between the first end of the first zener diode and the first end of the second zener diode.

7. The micro-power consumption CT self-energy extraction circuit according to claim 5, characterized in that: The energy conditioning circuit includes a Schmitt trigger and a first resistor, the first end of the Schmitt trigger is connected to the rectifier bridge, the second end of the Schmitt trigger is connected to the dual-embedded voltage protection circuit, the first end of the first resistor is connected to the Schmitt trigger, and the second end of the first resistor is grounded.

8. The micro-power consumption CT self-energy extraction circuit according to claim 6, characterized in that: The micro-power consumption CT self-energy extraction circuit also includes a key node monitoring circuit, which includes a second resistor and an operational amplifier, wherein the first end of the second resistor is connected to the switch element, the second end of the second resistor is grounded, the first end of the operational amplifier is connected to the second end of the second resistor and the grounded line, and the second end of the operational amplifier is connected to the power management unit.

9. A micro-power CT self-powering method, applied to the micro-power CT self-powering circuit according to any one of claims 1 to 8, characterized in that: include: The energy acquisition module non-invasively inductively acquires power on the overhead line to generate an induced electromotive force, converts the induced electromotive force into direct current, and determines whether the induced electromotive force input by the energy acquisition module is greater than a first rated voltage; If yes, the protection circuit is activated, and the connection between the energy acquisition module and the discharge module is disconnected; Based on the direct current output by the energy acquisition module, the discharge module outputs a charging voltage, and determines whether the charging voltage is less than a second rated voltage; If so, start the time-sharing power supply circuit and use the power supply module to supply power to the subsequent load circuit interval at minimum power; if not, start the energy conditioning circuit and control the connection between the energy acquisition module and the power supply module according to the third rated voltage of the direct current.

10. A micro-power consumption CT self-energy device, characterized in that: It comprises the micro-power consumption CT self-energy extraction circuit as described in any one of claims 1 to 8.

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