Magnetic energy collector based on double-coil structure and method
Through the magnetic energy collector based on the dual-coil structure, the control strategy of the control coil and controlled switch is used to solve the problem of too small and too large primary side current, which improves the output characteristics and stability of the magnetic energy collector and simplifies control The circuit avoids the need to increase the core additionally, and achieves suppression of core saturation and increase power.
Patent Information
- Application Number
- CN202311684393.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-08
- Publication Date
- 2025-01-03
AI Technical Summary
The existing magnetic energy collectors have insufficient output power when the primary current is too small. When the magnetic core is too large, the core depth is saturated and the circuit components are damaged. The control circuit is complex and difficult to apply in practice.
Using a magnetic energy collector based on a dual-coil structure, the magnetic core excitation current and magnetic flux are regulated by adding control coils and controlled switches, combined with control strategies under different primary current conditions, and the output characteristics are improved, and the power under small current conditions is solved. Insufficient, the problem of core saturation under high current conditions, simplifying the control circuit.
Increase the collection power under small current conditions, reduce the power supply dead zone, suppress core saturation under large current conditions, protect circuit components, and have simple control circuits and strong practicality, avoiding the need to add additional cores.
Smart Images
Figure CN119253873A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of magnetic energy collection, in particular to a magnetic energy collector and method based on a double-coil structure. Background Art
[0002] Magnetic energy harvesting technology has broad application prospects in the field of self-powered power supply for power system sensors due to its advantages such as high power density, no influence from weather conditions and maintenance-free. However, due to the wide range of fluctuations in the current of the transmission line, the existing magnetic energy harvesters mainly face two problems: 1. When the primary current is too small, the output power is insufficient; 2. When the primary current is too large, the magnetic core is deeply saturated, causing serious heat and damage to the circuit components.
[0003] In the prior art, the number of diodes connected in series must take into account the saturation suppression performance and the lower limit of energy extraction, and the diode heating problem is more serious. The composite structure of the magnetic core and the corresponding circuit optimization topology can improve the stability of the magnetic energy collector under the condition of a wide range of primary current fluctuations, but the dual magnetic core structure significantly increases the size and cost of the device. The collection power under different currents is improved by capacitor compensation and impedance matching, and a semi-controlled active rectifier bridge is used to adjust the short-circuit angle to avoid core saturation at high currents. The control circuit required for this method is complex, the control parameter accuracy requirements are high, and it is affected by the primary current fluctuations, so it is difficult to apply in practice. Therefore, it is difficult for the prior art to simultaneously solve the problems of the magnetic energy collector when the primary current is too small and too large, and the existing control circuit is complex, the control parameter accuracy requirements are high, and it is affected by the primary current fluctuations, so it is difficult to apply in practice; in order to adapt to the wide range of primary currents, additional magnetic cores need to be added, which increases the size and cost of the device.
[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention
[0005] The present invention provides a magnetic energy collector and method based on a double-coil structure, which can simultaneously solve the problems of the magnetic energy collector when the primary-side current is too small or too large without increasing the volume and is easy to control.
[0006] The magnetic energy collector based on the double coil structure includes:
[0007] A magnetic core, which is sleeved in the primary current circuit;
[0008] The secondary side energy taking coil is wound on one side of the magnetic core.
[0009] A rectifier bridge connected to the secondary side energy extraction coil,
[0010] A constant voltage load connected to the rectifier bridge to store electrical energy from the secondary side energy extraction coil,
[0011] The secondary control coil is wound on the other side of the magnetic core.
[0012] A controlled switch S is connected to the secondary side control coil, and the controlled switch S is opened and closed by a signal.
[0013] A controller is connected to and sends a signal to the controlled switch S, wherein the controller includes a comparison circuit for detecting a zero-crossing point of the primary-side current.
[0014] In the magnetic energy collector based on the dual-coil structure, when the primary side current is a small current less than the first predetermined current value, near both sides of the primary side current zero point, the controller generates a signal to control the controlled switch S to turn on, and near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn off. The sudden change of the magnetic core magnetic flux potential before and after the controlled switch S is turned on induces a voltage at both ends of the secondary side energy extraction coil, thereby driving the rectifier bridge to turn on.
[0015] In the magnetic energy collector based on the double coil structure, the first predetermined current value is 5A rms .
[0016] In the magnetic energy collector based on the dual-coil structure, when the primary side current is a large current greater than the second predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn off, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn on.
[0017] In the magnetic energy collector based on the double coil structure, the second predetermined current value is 25A rms .
[0018] In the magnetic energy collector based on the double-coil structure, the magnetic energy collector is a current transformer type magnetic energy collector.
[0019] In the magnetic energy collector based on the double-coil structure, the comparison circuit includes a sampling resistor and an operational amplifier.
[0020] In the magnetic energy collector based on the double-coil structure, the constant voltage load includes an energy storage capacitor.
[0021] In the magnetic energy collector based on the double-coil structure, the controlled switch S comprises a MOSFET tube.
[0022] The collection method of the magnetic energy collector based on the double-coil structure includes the following steps:
[0023] The magnetic core is sleeved in the primary side current circuit, the secondary side energy taking coil is wound on one side of the magnetic core, the secondary side control coil is wound on the other side of the magnetic core, and the constant voltage load is connected to the rectifier bridge to store the electric energy from the secondary side energy taking coil;
[0024] The controlled switch S is connected to the secondary side control coil, and the controlled switch S is opened and closed by a signal. When the controller detects that the primary side current is a small current less than the first predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn on, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn off. The sudden change of the magnetic flux potential of the magnetic core before and after the controlled switch S is turned on induces a voltage at both ends of the secondary side energy extraction coil, thereby driving the rectifier bridge to turn on; when the controller detects that the primary side current is a large current greater than the second predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn off, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn on.
[0025] Compared with the prior art, the present invention has the following advantages:
[0026] The magnetic energy collector based on the double-coil structure can regulate the magnetic core excitation current and magnetic flux by adding a control coil and a controlled switch, and combined with the control strategy under different primary current conditions. This method can control and improve the output characteristics of the magnetic energy collector, and solve the problems of the magnetic energy collector when the primary current is too small or too large. Under low current conditions, the collection power is increased to reduce the power supply dead zone, and under high current conditions, the magnetic core saturation is suppressed and the back-end circuit components are protected. The control circuit is simple, the control parameters are few, and the practicality is strong. The controlled element is only one switch, and the control parameter is only the switch conduction time. No additional magnetic core is required, and the control circuit structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.
[0028] Figure 1(a) to Figure 1(c) FIG1 is a schematic diagram of the control of a magnetic energy collector based on a dual-coil structure under low current conditions according to an embodiment of the present invention, wherein FIG1(a) is a schematic diagram of the control strategy under low current conditions, FIG1(b) is a schematic diagram of the magnetomotive force, and FIG1(c) is a schematic diagram of the voltage waveform of the energy collection coil;
[0029] Figure 2 A schematic diagram of average load current under different loads and switch on time ton according to an embodiment of the present invention;
[0030] Figure 3A schematic diagram of maximum load average power before and after using the method under different primary side currents according to an embodiment of the present invention;
[0031] Figure 4(a) to Figure 4(c) FIG4 is a schematic diagram of control under high current conditions of a magnetic energy collector based on a double-coil structure according to an embodiment of the present invention, wherein FIG4(a) is a schematic diagram of a control strategy under high current conditions, FIG4(b) is a schematic diagram of a load current waveform, and FIG4(c) is a schematic diagram of a magnetomotive force;
[0032] FIG5(a) and FIG5(b) are schematic diagrams of load current waveform and normalized load average power of the present invention, wherein FIG5(a) is a schematic diagram of load current waveform, and FIG5(b) is a schematic diagram of normalized load average power;
[0033] Figure 6 This is a schematic diagram of the structure of the magnetic energy collector based on the double-coil structure proposed by the present invention;
[0034] Figure 7 This is a schematic flow chart of the collection method of the magnetic energy collector based on the double-coil structure proposed in the present invention. DETAILED DESCRIPTION
[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and implementations. It is to be understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings.
[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0037] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as exemplary features that provide various details of some ways in which the technical concept of the present invention can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present invention.
[0038] Cross-hatching and / or shading may be used in the drawings, typically to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments may be implemented differently, the specific process sequence may be performed in a different order than the described step sequence. For example, two successively described processes may be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.
[0039] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.
[0040] For descriptive purposes, the present invention may use spatially relative terms such as "below", "beneath", "under", "down", "above", "upper", "above", "higher", and "side (e.g., as in "sidewall")" to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "below" or "beneath" other components or features would then be positioned "above" the other components or features. Thus, the exemplary term "below" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.
[0041] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values and / or the values provided that will be recognized by those of ordinary skill in the art.
[0042] See also Figure 1(a) to Figure 7 In one embodiment, the magnetic energy collector based on the double-coil structure of the present invention comprises:
[0043] A magnetic core, which is sleeved in the primary current circuit;
[0044] The secondary side energy taking coil is wound on one side of the magnetic core.
[0045] A rectifier bridge connected to the secondary side energy extraction coil,
[0046] A constant voltage load connected to the rectifier bridge to store electrical energy from the secondary side energy extraction coil,
[0047] The secondary control coil is wound on the other side of the magnetic core.
[0048] A controlled switch S is connected to the secondary side control coil, and the controlled switch S is opened and closed by a signal.
[0049] A controller is connected to and sends a signal to the controlled switch S, wherein the controller includes a comparison circuit for detecting a zero-crossing point of the primary-side current.
[0050] In a preferred embodiment of the magnetic energy collector based on the dual-coil structure, when the primary side current is a small current less than the first predetermined current value, near both sides of the primary side current zero point, the controller generates a signal to control the controlled switch S to turn on, and near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn off. The sudden change of the magnetic core magnetic flux potential before and after the controlled switch S is turned on induces a voltage at both ends of the secondary side energy extraction coil, thereby driving the rectifier bridge to turn on.
[0051] In the preferred embodiment of the magnetic energy collector based on the double coil structure, the first predetermined current value is 5A. rms .
[0052] In a preferred embodiment of the magnetic energy collector based on the dual-coil structure, when the primary side current is a large current greater than the second predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn off, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn on.
[0053] In the preferred embodiment of the magnetic energy collector based on the double coil structure, the second predetermined current value is 25A. rms .
[0054] In a preferred embodiment of the magnetic energy collector based on the double-coil structure, the magnetic energy collector is a current transformer type magnetic energy collector.
[0055] In a preferred embodiment of the magnetic energy collector based on the double-coil structure, the comparison circuit includes a sampling resistor and an operational amplifier.
[0056] In a preferred embodiment of the magnetic energy collector based on the double-coil structure, the constant voltage load includes an energy storage capacitor.
[0057] In a preferred embodiment of the magnetic energy collector based on the double-coil structure, the controlled switch S comprises a MOSFET tube.
[0058] In one embodiment, a magnetic energy collector based on a dual-coil structure is composed of a current transformer type magnetic energy collector core, a secondary side control coil, a controlled switch, a secondary side energy extraction coil, a rectifier bridge and a constant voltage load such as an energy storage capacitor at its rear end. The secondary side energy extraction coil of the magnetic energy collector is connected to the rectifier bridge, and the output end of the rectifier bridge is connected to the energy storage capacitor as a constant voltage load. The secondary side control coil of the magnetic energy collector is connected to a controlled switch S, such as a MOSFET tube. The controlled switch S is controlled by a signal generated by an STM32 series single-chip microcomputer. A comparison circuit composed of a sampling resistor and an LM358 operational amplifier is used to detect the zero crossing of the primary side current.
[0059] The collection method of the magnetic energy collector based on the double-coil structure includes the following steps:
[0060] The magnetic core is sleeved in the primary side current circuit, the secondary side energy taking coil is wound on one side of the magnetic core, the secondary side control coil is wound on the other side of the magnetic core, and the constant voltage load is connected to the rectifier bridge to store the electric energy from the secondary side energy taking coil;
[0061] The controlled switch S is connected to the secondary side control coil, and the controlled switch S is opened and closed by a signal. When the controller detects that the primary side current is a small current less than the first predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn on, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn off. The sudden change of the magnetic flux potential of the magnetic core before and after the controlled switch S is turned on induces a voltage at both ends of the secondary side energy extraction coil, thereby driving the rectifier bridge to turn on; when the controller detects that the primary side current is a large current greater than the second predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn off, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn on.
[0062] In one embodiment, the magnetic core excitation current and magnetic flux are regulated to control the output characteristics of the magnetic energy collector. Under low current conditions, the switch S is controlled to be turned on near both sides of the zero point of the primary current, and the switch S is controlled to be turned off near both sides of the peak point. The sudden change of the magnetic flux potential of the magnetic core before and after the switch S is turned on will induce a higher voltage at both ends of the energy collection coil and then drive the rectifier bridge to turn on, so as to solve the problems of insufficient collector output power and power supply dead zone; under high current conditions, in contrast to the control strategy under low current conditions, the switch S is controlled to be turned off near both sides of the zero point of the primary current, and the switch S is controlled to be turned on near both sides of the peak point. The smaller the switch off time, the lower the load current amplitude and the shorter the duration. The reduction in the load current value reduces the collector output power, avoiding the excessively high voltage value of the rear-end energy storage capacitor causing deep saturation of the magnetic core and damage to circuit components.
[0063] Control strategy and analysis under different primary current amplitudes:
[0064] 1. Control strategy and analysis under low current conditions:
[0065] In order to solve the problem of insufficient output power and power supply dead zone of magnetic energy collector under low current, the control strategy proposed by this method is shown in Figure 1(a). The switch S is controlled to be turned on near both sides of the zero-crossing point of the primary current, and the switch S is controlled to be turned off near both sides of the peak point. When the switch is turned on, the magnetic core is approximately short-circuited, and its excitation current and magnetic flux potential remain basically unchanged. The induced voltage at both ends of the energy collection coil is approximately 0, so the rectifier bridge is not turned on and the load current is 0. When the switch is changed from the on state to the off state, the control coil current becomes 0, and the primary side current will be used entirely for excitation, so the magnetic core excitation current and magnetic flux potential will change suddenly, as shown in Figure 1(b). The sudden change of magnetic flux potential will induce a higher voltage at both ends of the energy collection coil and drive the rectifier bridge to turn on. The current coupled to the secondary side will partially flow into the load and collect power. After the rectifier bridge is turned on, the voltage of the energy collection coil is clamped by the load voltage, and the magnetic flux potential of the magnetic core changes approximately linearly. Figures 1(b) and 1(c) show that when the primary side current is 5A, the current of the energy collection coil is 0. rmsWhen the load voltage is greater than 3V, when the control method proposed in the present invention is not used, the voltage across the energy-taking coil is always lower than the load voltage, the rectifier bridge cannot be turned on, and the load power is 0. rms The effect of increasing load power under certain conditions, such as Figure 2 The results show that the higher voltage generated by the sudden change of the magnetic flux potential of the core in this method ensures that the rectifier bridge can be turned on under a load voltage of 2-12V. As the conduction time t of the switches S on both sides of the zero crossing point increases, on increases, the average value of the load current increases first and then decreases, so t on There is an optimal value that maximizes the average load current and the harvested power. The higher the load voltage, the smaller the t corresponding to the maximum average load current. on The bigger.
[0066] Figure 3 The maximum load average power before and after using this method under different primary currents is shown. This method always maintains the effect of improving load power. When the primary current is 5A rms Up to 25A rms When the load power increase rate is between 158% and 1003%, the load power increase rate is between 158% and 1003%. Since the smaller the primary current is, the more important the power increase is, so this method meets the actual needs of the magnetic energy collector.
[0067] 2. Control strategy and analysis under high current conditions:
[0068] To solve the problem of saturation heating of the magnetic core of the magnetic energy collector under high current conditions and high capacitor voltage damaging circuit components due to excessive output power, the control strategy proposed by this method is shown in Figure 4(a). In contrast to the control strategy under low current conditions, the switch S is controlled to be turned off near both sides of the zero-crossing point of the primary current, and the switch S is controlled to be turned on near both sides of the peak point.
[0069] Since the current value near the zero crossing point is small, turning off the switch and driving the rectifier bridge to conduct can effectively reduce the load current amplitude. The result is shown in Figure 4(b). Switch off time t off The smaller the load current is, the lower the load current amplitude is and the shorter the duration is. The reduction of load current value reduces the output power of the collector and avoids the excessive voltage value of the rear energy storage capacitor causing deep saturation of the magnetic core and damage to the circuit components. The results in Figure 4(c) show that when the switch is disconnected for t off When the load voltage is small, the core is in a short-circuit state for most of the time in each primary current cycle, and the load voltage acts on the core for a short time, so the core magnetomotive force is always maintained at a low level, and the core does not enter the saturation state. When the proposed control strategy is not used, the high load capacitor voltage will act on the core for a long time, causing its magnetomotive force to surge, and the core will enter a deep saturation state and heat up seriously.
[0070] The method was tested in 100A rms The effectiveness of suppressing the load current at high current is shown in Figure 5(a). The load current value is significantly reduced when this method is used, and the switch disconnection time t off The smaller the load current amplitude, the shorter the duration, which is consistent with the theoretical analysis. Taking the average load power in Figure 5(a) when this method is not used as the base value, the different switch disconnection times t off The normalized load average power under the condition is shown in Figure 5(b). off When the time is reduced from 1.5ms to 0.25ms, the normalized load average power is reduced from 0.143 to 0.004. Therefore, the reduction of the collected power by this method at high current effectively avoids the deep saturation of the magnetic core caused by the excessively high capacitor voltage value, and protects the circuit components at the back end of the collector.
[0071] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.
[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0073] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.
Claims
1. A magnetic energy collector based on a double coil structure, characterized in that: It includes: A magnetic core, which is sleeved in the primary current circuit; The secondary side energy taking coil is wound on one side of the magnetic core. The secondary control coil is wound on the other side of the magnetic core. A controlled switch S is connected to the secondary side control coil, and the controlled switch S is opened and closed by a signal. A controller is connected to and sends a signal to the controlled switch S, wherein the controller includes a comparison circuit for detecting a zero-crossing point of the primary-side current.
2. The magnetic energy collector based on the double coil structure according to claim 1 is characterized in that: Preferably, when the controlled switch S is turned on and near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn off, and the magnetic flux potential of the magnetic core changes suddenly before and after the controlled switch S is turned on.
3. The magnetic energy collector based on the double coil structure according to claim 2 is characterized in that: The first predetermined current value is 5A rms .
4. The magnetic energy collector based on the double coil structure according to claim 1 is characterized in that: The controlled switch S is controlled to be turned off. When the controlled switch S is near both sides of the peak point, the controller generates a signal to control the controlled switch S to be turned on.
5. The magnetic energy collector based on the double coil structure according to claim 4 is characterized in that: The second predetermined current value is 25A rms .
6. The magnetic energy collector based on the double coil structure according to claim 1 is characterized in that: The magnetic energy collector is a current transformer type magnetic energy collector.
7. The magnetic energy collector based on the double coil structure according to claim 1 is characterized in that: The comparison circuit includes a sampling resistor and an operational amplifier.
8. The magnetic energy collector based on the double coil structure according to claim 1 is characterized in that: The constant voltage load includes an energy storage capacitor.
9. The magnetic energy collector based on the double coil structure according to claim 1, characterized in that: The controlled switch S comprises a MOSFET tube.
10. A method for collecting magnetic energy based on a double-coil structure according to any one of claims 1 to 9, characterized in that: It includes the following steps, The magnetic core is sleeved in the primary side current circuit, the secondary side energy taking coil is wound on one side of the magnetic core, the secondary side control coil is wound on the other side of the magnetic core, and the constant voltage load is connected to the rectifier bridge to store the electric energy from the secondary side energy taking coil; The controlled switch S is connected to the secondary side control coil, and the controlled switch S is opened and closed by a signal. When the controller detects that the primary side current is a small current less than the first predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn on, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn off. The sudden change of the magnetic flux potential of the magnetic core before and after the controlled switch S is turned on induces a voltage at both ends of the secondary side energy extraction coil, thereby driving the rectifier bridge to turn on; when the controller detects that the primary side current is a large current greater than the second predetermined current value, when the primary side current is near both sides of the zero point, the controller generates a signal to control the controlled switch S to turn off, and when the primary side current is near both sides of the peak point, the controller generates a signal to control the controlled switch S to turn on.