Energy taking circuit and electronic equipment

Abstract

The invention provides an energy taking circuit and electronic equipment. The energy taking circuit transmits a first part of energy discharged by the sub-module capacitor to the first supply module through the storage module, stores a second part of energy discharged by the sub-module capacitor, and supplies power to the control unit in the sub-module through the first supply module according to the first part of energy. And the second supply module supplies power to the control module according to the second part of energy. The energy taking circuit provided by the invention is low in loss, small in size and high in power density. The switching frequency of the first power tube and the switching frequency of the second power tube are low, so that the energy taking circuit is small in loss and good in heat dissipation effect. Through the storage module, the first supply module and the second supply module, electrical isolation between the sub-module capacitor and the control unit can be realized, and through the storage module and the first supply module, stable working voltage can be provided for the control unit. And stable working voltage can be provided for the control module through the storage module and the second supply module.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage direct current transmission, and in particular to an energy extraction circuit and electronic equipment. Background Art

[0002] High-voltage direct current transmission usually uses high-power power electronic devices to achieve AC-DC conversion and transmission of electric energy. From conventional high-voltage direct current transmission technology based on thyristors to flexible direct current transmission technology based on insulated gate bipolar transistors (IGBTs), high-voltage direct current transmission technology is constantly improving and expanding.

[0003] Both the power electronic devices and the control unit in the converter submodule need to be powered by the energy extraction circuit. The energy extraction circuit can obtain electrical energy from the submodule capacitor, but the output voltage of the submodule capacitor is usually several hundred volts to several thousand volts. Therefore, the energy extraction circuit that supplies power to the power electronic devices and the control unit needs to meet the working requirements of a wide voltage input and needs to output a voltage of only a few volts. The energy extraction circuit provided by the related art usually adopts a flyback circuit, which includes a plurality of metal-oxide-semiconductor field-effect transistors (metal-oxide-semiconductor field-effect transistor, MOSFET, referred to as MOS tube) connected in series. However, the conduction pulse width of the MOS tube is very narrow, which may cause the MOS tube to be unable to be fully turned on and off, and it is difficult to achieve voltage equalization control between multiple MOS tubes, resulting in large losses and volume of the energy extraction circuit and low power density. Summary of the invention

[0004] In order to solve the problems of large loss and volume and low power density in the prior art, the present application provides an energy extraction circuit, which may include a control module, a storage module, a first supply module and a second supply module.

[0005] The control module is used to control the storage module and the second supply module.

[0006] The storage module is used for: under the control of the control module, transmitting the first part of the energy discharged from the submodule capacitor to the first supply module, and storing the second part of the energy discharged from the submodule capacitor.

[0007] The first supply module is used to supply power to the control unit in the submodule according to the first portion of energy.

[0008] The second supply module is used to: under the control of the control module, supply power to the control module according to the second portion of energy.

[0009] In some possible implementations, the storage module includes a first rectifier diode, a first current limiting resistor, a first coupling inductor, a first energy storage capacitor, and a first power tube.

[0010] The anode of the first rectifier diode is connected to the positive electrode of the sub-module capacitor, the cathode of the first rectifier diode is connected to the first end of the first coil in the first coupled inductor through the first current limiting resistor, the second end of the first coil in the first coupled inductor is connected to the positive electrode of the first energy storage capacitor, the negative electrode of the first energy storage capacitor is connected to the second electrode of the first power tube, and the first electrode of the first power tube is connected to the negative electrode of the sub-module capacitor.

[0011] In some other possible implementations, the second supply module includes a storage unit and a supply unit. The storage unit is connected in parallel with the first energy storage capacitor, and the supply unit is coupled to the storage unit.

[0012] The storage unit is used to transmit the second part of energy to the supply unit under the control of the control module.

[0013] The supply unit is used to supply power to the control module according to the second portion of energy.

[0014] Exemplarily, the storage unit includes a second rectifier diode, a second current limiting resistor, a second coupled inductor and a second power tube.

[0015] The anode of the second rectifier diode is connected to the positive electrode of the first energy storage capacitor, the cathode of the second rectifier diode is connected to the first end of the first coil in the second coupled inductor through the second current limiting resistor, the second end of the first coil in the second coupled inductor is connected to the second electrode of the second power tube, and the first electrode of the second power tube is connected to the negative electrode of the first energy storage capacitor.

[0016] Optionally, the supply unit includes a third rectifier diode and a first filter capacitor.

[0017] The anode of the third rectifier diode is connected to the first end of the second coil in the second coupled inductor. The cathode of the third rectifier diode is connected to the positive electrode of the first filter capacitor as the first output end of the supply unit. The negative electrode of the first filter capacitor is connected to the second end of the second coil in the second coupled inductor as the second output end of the supply unit.

[0018] In some possible implementations, the first supply module includes a fourth rectifier diode and a second filter capacitor.

[0019] The anode of the fourth rectifier diode is connected to the first end of the second coil in the first coupled inductor. The cathode of the fourth rectifier diode is connected to the positive electrode of the second filter capacitor as the first output end of the first supply module. The negative electrode of the second filter capacitor is connected to the second end of the second coil in the first coupled inductor as the second output end of the first supply module.

[0020] Furthermore, the supply unit also includes a first voltage stabilizing branch, and the first voltage stabilizing branch is connected in parallel with the first filter capacitor.

[0021] The first supply module also includes a second voltage stabilizing branch, and the second voltage stabilizing branch is connected in parallel with the second filter capacitor.

[0022] Optionally, the control module is specifically used for:

[0023] The first power tube is controlled according to the terminal voltage of the submodule capacitor and the current flowing through the first coupled inductor, or the first power tube is controlled according to the terminal voltage of the first energy storage capacitor.

[0024] The second power tube is controlled according to the terminal voltage of the first energy storage capacitor and the current flowing through the second coupled inductor.

[0025] Furthermore, the control module is specifically used for:

[0026] When the fluctuation of the terminal voltage of the submodule capacitor exceeds the preset first fluctuation range and the current flowing through the first coupled inductor reaches the preset first current threshold, the first power tube is controlled to be turned off. Alternatively, when the terminal voltage of the first energy storage capacitor reaches the preset voltage threshold, the first power tube is controlled to be turned off.

[0027] When the fluctuation amount of the terminal voltage of the first energy storage capacitor exceeds a preset second fluctuation range and the current flowing through the second coupled inductor reaches a preset second current threshold, the second power tube is controlled to be turned off.

[0028] Exemplarily, the control module is specifically used for:

[0029] When the voltage required by the control unit increases, the conduction time of the first power tube is shortened. Alternatively, when the voltage required by the control unit decreases, the conduction time of the first power tube is prolonged.

[0030] When the voltage required by the control module increases, the conduction time of the second power tube is shortened. Alternatively, when the voltage required by the control module decreases, the conduction time of the second power tube is prolonged.

[0031] Optionally, the energy harvesting circuit is used to:

[0032] The first power tube is turned on, the submodule capacitor is discharged, the current flowing through the first coupled inductor increases, and the first energy storage capacitor is charged.

[0033] The first power tube is turned off, and the first part of energy is provided to the control unit through the first coupled inductor.

[0034] The second power tube is turned on, the first energy storage capacitor is discharged, and the current flowing through the second coupled inductor increases.

[0035] The second power tube is turned off, and the second part of energy is provided to the control module through the second coupled inductor.

[0036] Exemplarily, the storage module further includes a dynamic control unit, which is connected in parallel with the first energy storage capacitor.

[0037] The dynamic control unit is used to: control the capacitance of the first energy storage capacitor.

[0038] Furthermore, the dynamic control unit includes a first control branch and a second control branch connected in parallel.

[0039] The first regulating branch includes a second energy storage capacitor and a third power tube connected in series.

[0040] The second regulating branch includes a third energy storage capacitor and a fourth power tube connected in series.

[0041] Optionally, the energy harvesting circuit is used to:

[0042] The first power tube, the third power tube and the fourth power tube are turned on in sequence, and the second power tube is turned off, and the first energy storage capacitor, the second energy storage capacitor and the third energy storage capacitor start to charge respectively. When the voltage of the first energy storage capacitor, the second energy storage capacitor and the third energy storage capacitor reaches a preset voltage threshold, the first power tube, the third power tube and the fourth power tube are all turned off.

[0043] The second power tube is turned on, the first power tube, the third power tube and the fourth power tube are all turned off, the first energy storage capacitor is discharged, the second energy storage capacitor is discharged through the diode anti-parallel to the third power tube, and the third energy storage capacitor is discharged through the diode anti-parallel to the fourth power tube.

[0044] On the other hand, the present application also provides an electronic device, including a circuit board and the above-mentioned energy extraction circuit, and the energy extraction circuit is arranged on the circuit board.

[0045] Compared with the prior art, the beneficial effects of this application are:

[0046] The energy extraction circuit provided in the present application transmits the first part of the energy discharged from the submodule capacitor to the first supply module through the storage module, and stores the second part of the energy discharged from the submodule capacitor, and supplies power to the control unit in the submodule according to the first part of the energy through the first supply module, and also supplies power to the control module according to the second part of the energy through the second supply module. It can be seen that the present application can realize the power supply of the control unit and the power supply of the control module. In other words, not only the power supply of the control unit is realized, but also the self-power supply of the energy extraction circuit is realized. Compared with the energy extraction circuit of the multi-stage flyback circuit connected in series provided by the related art, the energy extraction circuit provided in the present application has low loss, small size, and high power density.

[0047] In the present application, the operating frequency of the first power tube is determined by the charge and discharge time of the first energy storage inductor and the first energy storage capacitor, and the operating frequency of the second power tube is determined by the charge and discharge time of the second energy storage inductor and the first energy storage capacitor. Therefore, in the present application, the switching frequency of the first power tube and the second power tube is relatively low, which can further reduce the loss of the energy extraction circuit, so that the heat dissipation effect of the entire energy extraction circuit is relatively high, thereby improving the working efficiency of the energy extraction circuit.

[0048] The present application can achieve electrical isolation between the sub-module capacitor and the control unit through the storage module, the first supply module and the second supply module, and can provide a stable operating voltage for the control unit through the storage module and the first supply module, and can provide a stable operating voltage for the control module through the storage module and the second supply module.

[0049] In the present application, the first rectifier diode realizes unidirectional conduction of the charging current or the discharging current of the first energy storage capacitor, prevents the first coupled inductor and the first energy storage capacitor from forming high-frequency oscillation, and improves the stability of the energy extraction circuit. Similarly, the second rectifier diode realizes unidirectional conduction of the charging current or the discharging current of the first energy storage capacitor, prevents the second coupled inductor and the first energy storage capacitor from forming high-frequency oscillation, and improves the stability of the energy extraction circuit.

[0050] The first coupled inductor in the present application can realize electrical isolation between the storage module and the first supply module, and the second coupled inductor can realize electrical isolation between the storage unit and the supply unit.

[0051] Since the terminal voltage of the submodule capacitor is relatively high and has a wide range, the energy extraction circuit provided in the present application is more suitable for application scenarios with high voltage input and low power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0053] Figure 1 A schematic structural diagram of an energy extraction circuit in an embodiment of the present application;

[0054] Figure 2 A schematic structural diagram of an energy extraction circuit in an embodiment of the present application;

[0055] Figure 3 A schematic structural diagram of an energy extraction circuit in an embodiment of the present application;

[0056] Figure 4This is a schematic diagram of a process for controlling the first power tube and the second power tube in an embodiment of the present application;

[0057] Figure 5 A schematic structural diagram of an energy extraction circuit in an embodiment of the present application;

[0058] Figure 6 It is a schematic diagram of a process of controlling the first power tube, the second power tube, the third power tube and the fourth power tube in the embodiment of the present application. DETAILED DESCRIPTION

[0059] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0060] The terms "first", "second", etc. in the specification embodiments, claims, and drawings of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, including a series of steps or units. The method, system, product, or device is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0061] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0062] The present application provides an energy-taking circuit, such as Figure 1 The energy-harvesting circuit 10 includes a control module 11 , a storage module 12 , a first supply module 13 and a second supply module 14 .

[0063] The control module 11 is used to control the storage module 12 and the second supply module 14. Figure 1 The control module 11 can send a control signal CS1 to the storage module 12 , and can also send a control signal CS2 to the second supply module 14 .

[0064] The storage module 12 is used to: under the control of the control module 11, transmit the first part of the energy E1 discharged from the submodule capacitor Cin to the first supply module 13, and store the second part of the energy E2 discharged from the submodule capacitor.

[0065] The first supply module 13 is used to supply power to the control unit in the submodule according to the first portion of energy E1.

[0066] The second supply module 14 is used to supply power to the control module 11 according to the second portion of energy E2 under the control of the control module 11 .

[0067] In some possible implementations, such as Figure 2 As shown, the storage module 11 includes a first rectifier diode D1, a first current limiting resistor R1, a first coupling inductor L1, a first energy storage capacitor C1 and a first power tube Q1. Among them, the first coupling inductor L1 may include a first coil L11 and a second coil L12. Among them, the first current limiting resistor R1 can limit the charging and discharging current of the first energy storage capacitor C1, and can also consume part of the energy to prevent excessive energy from being transmitted. The first rectifier diode D1 realizes unidirectional conduction of the charging current or discharging current of the first energy storage capacitor C1, prevents the first coupling inductor L1 and the first energy storage capacitor C1 from forming high-frequency oscillation, and improves the stability of the energy extraction circuit.

[0068] Optionally, the first power transistor Q1 may be an insulated gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET, which may be referred to as a MOS transistor for short), etc. In the embodiment of the present application, the first power transistor Q1 may be an NMOS transistor.

[0069] The anode of the first rectifier diode D1 is connected to the positive electrode of the submodule capacitor Cin, the cathode of the first rectifier diode D1 is connected to the first end of the first coil L11 in the first coupling inductor L1 through the first current limiting resistor R1, the second end of the first coil L11 in the first coupling inductor L1 is connected to the positive electrode of the first energy storage capacitor C1, the negative electrode of the first energy storage capacitor C1 is connected to the second electrode (which can be the drain electrode) of the first power tube Q1, and the first electrode (which can be the source electrode) of the first power tube Q1 is connected to the negative electrode of the submodule capacitor Cin. The control electrode of the first power tube Q1 can be connected to the control module 11 ( Figure 2 not shown).

[0070] It is conceivable that if the operating voltage of the first power tube Q1 is greater than the terminal voltage of the submodule capacitor, then the storage module 11 may have only one power tube (i.e., the first power tube Q1). If the operating voltage of the first power tube Q1 is less than the terminal voltage of the submodule capacitor, the storage module 11 may include multiple power tubes, and the multiple power tubes may be connected in series, in parallel, or in series and parallel.

[0071] By controlling the first power tube Q1 to be turned on, the submodule capacitor Cin forms a discharge loop through the first rectifier diode D1, the first current limiting resistor R1, the first coupling inductor L1, the first energy storage capacitor C1 and the first power tube Q1. The first part of the energy E1 discharged from the submodule capacitor Cin can be transmitted to the first supply module 13 through the first coupling inductor L1, and the second part of the energy E2 discharged from the submodule capacitor Cin can also be stored through the first storage capacitor C1.

[0072] When the first power tube Q1 is turned off or the current flowing through the first energy storage capacitor C1 is reduced to 0 (that is, the submodule capacitor Cin is no longer discharged), the first part of the energy E1 stored in the first coupling inductor L1 can be used to charge the second filter capacitor C3 through the fourth rectifier diode D4 and provided to the control unit, and the voltage of the second filter capacitor C3 will increase. After the first coupling inductor L1 releases the first part of the energy E1, the second filter capacitor C3 is discharged to the control unit, and the voltage of the second filter capacitor C3 will decrease.

[0073] In some other possible implementations, refer to Figure 2 The second supply module 13 includes a storage unit 131 and a supply unit 132. The storage unit 131 is connected in parallel with the first energy storage capacitor C1, and the supply unit 132 is coupled with the storage unit 131.

[0074] The storage unit 131 is used to transmit the second portion of energy E2 to the supply unit 132 under the control of the control module 11 .

[0075] The supply unit 132 is used to supply power to the control module 11 according to the second portion of energy E2.

[0076] Exemplary, reference Figure 2 The storage unit 131 includes a second rectifier diode D2, a second current limiting resistor R2, a second coupling inductor L2 and a second power tube Q2. The second coupling inductor L2 may include a first coil L21 and a second coil L22. The second current limiting resistor R2 may limit the charge and discharge current of the first energy storage capacitor C1, and may also consume part of the energy to prevent excessive energy transmission. The second rectifier diode D2 enables the charging current or the discharging current of the first energy storage capacitor C1 to be unidirectionally conducted, thereby preventing the second coupling inductor L2 and the first energy storage capacitor C1 from forming high-frequency oscillations, and improving the stability of the energy extraction circuit.

[0077] Optionally, the second power tube Q2 may be an IGBT or a MOS tube, etc. In the embodiment of the present application, the second power tube Q2 may be an NMOS tube.

[0078] The anode of the second rectifier diode D2 is connected to the positive electrode of the first energy storage capacitor C1, the cathode of the second rectifier diode D2 is connected to the first end of the first coil L21 in the second coupling inductor L2 through the second current limiting resistor R2, the second end of the first coil L21 in the second coupling inductor L2 is connected to the second electrode (which can be the drain) of the second power tube Q2, and the first electrode (which can be the source) of the second power tube is connected to the negative electrode of the first energy storage capacitor C1. The control electrode of the second power tube Q2 can be connected to the control module 11 ( Figure 2 not shown).

[0079] The second power tube Q2 is controlled to be turned on, so that the energy of the first energy storage capacitor C1 is released to the supply unit 132 through the second rectifier diode D2, the second current limiting resistor R2, the second coupling inductor L2 and the second power tube Q2.

[0080] When the second power tube Q2 is turned off or the current flowing through the first energy storage capacitor C1 is zero, the second part of energy E2 is provided to the control module 11 through the second coupling inductor L2.

[0081] It is conceivable that if the operating voltage of the second power tube Q2 is greater than the terminal voltage of the submodule capacitor, then the storage unit 131 may have only one power tube (i.e., the second power tube Q2). If the operating voltage of the second power tube Q2 is less than the terminal voltage of the submodule capacitor, the storage unit 131 may include multiple power tubes, and the multiple power tubes may be connected in series, in parallel, or in series and parallel.

[0082] Since the operating frequency of the first power tube Q1 is determined by the charging and discharging time of the first energy storage inductor L1 and the first energy storage capacitor C1, and the operating frequency of the second power tube Q2 is determined by the charging and discharging time of the second energy storage inductor L2 and the first energy storage capacitor C1, the switching frequency of the first power tube Q1 and the second power tube Q2 in the present application is relatively low, which can reduce the loss of the energy extraction circuit.

[0083] Exemplarily, the control module 11 is specifically used for:

[0084] When the voltage required by the control unit increases, the on-time of the first power tube Q1 is shortened to limit the energy transmitted to the control unit, thereby reducing the output voltage of the first supply module 14. Alternatively, when the voltage required by the control unit decreases, the on-time of the first power tube Q1 is prolonged to increase the energy transmitted to the control unit, thereby increasing the output voltage of the first supply module 14.

[0085] When the voltage required by the control module 11 increases, the conduction time of the second power tube Q2 is shortened to limit the energy transmitted to the control module 11, thereby reducing the output voltage of the supply unit 132. Alternatively, when the voltage required by the control module 11 decreases, the conduction time of the second power tube Q2 is prolonged to increase the energy transmitted to the control module 11, thereby increasing the output voltage of the supply unit 132.

[0086] Optionally, the supply unit 132 includes a third rectifier diode D3 and a first filter capacitor C2.

[0087] The anode of the third rectifier diode D3 is connected to the first end of the second coil L22 in the second coupling inductor L2. The cathode of the third rectifier diode D3 is connected to the positive electrode of the first filter capacitor C2, as the first output end of the supply unit 132. The negative electrode of the first filter capacitor C2 is connected to the second end of the second coil L22 in the second coupling inductor L2, as the second output end of the supply unit 132. The first output end and the second output end of the supply unit 132 can be connected to the control module 11.

[0088] Optionally, the electric energy stored in the second coupled inductor L2 can supply power to the control module through the third rectifier diode D3, and charge the first filter capacitor C2 at the same time.

[0089] In some possible implementations, continue to refer to Figure 2 The first supply module 114 includes a fourth rectifier diode D4 and a second filter capacitor C3.

[0090] The anode of the fourth rectifier diode D4 is connected to the first end of the second coil L12 in the first coupling inductor L1. The cathode of the fourth rectifier diode D4 is connected to the positive electrode of the second filter capacitor C3, serving as the first output end of the first supply module 14. The negative electrode of the second filter capacitor C3 is connected to the second end of the second coil L12 in the first coupling inductor L1, serving as the second output end of the first supply module 14. The first output end and the second output end of the first supply module 14 can be connected to the control unit.

[0091] For further reference, Figure 3 , the supply unit 132 also includes a first voltage stabilizing branch, and the first voltage stabilizing branch is connected in parallel with the first filter capacitor C2. In the embodiment of the present application, the first voltage stabilizing branch may include a resistor R3, a transistor T1 and a voltage stabilizing diode D5. The first end of the resistor R3 and the collector of the transistor T1 are both connected to the cathode of the fourth rectifier diode D5, the second end of the resistor R3 and the gate of the transistor T1 are both connected to the cathode of the voltage stabilizing diode D5, and the anode of the voltage stabilizing diode D5 is connected to the cathode of the second filter capacitor C3. The emitter of the transistor T1 can be connected to the control unit, and the anode of the voltage stabilizing diode D5 can also be connected to the control unit.

[0092] refer to Figure 3 , the first supply module 14 also includes a second voltage stabilizing branch, and the second voltage stabilizing branch is connected in parallel with the second filter capacitor C3. In the embodiment of the present application, the second voltage stabilizing branch may include a resistor R4, a transistor T2 and a voltage stabilizing diode D6. The first end of the resistor R4 and the collector of the transistor T2 are both connected to the cathode of the third rectifier diode D3, the second end of the resistor R4 and the gate of the transistor T2 are both connected to the cathode of the voltage stabilizing diode D6, and the anode of the voltage stabilizing diode D6 is connected to the cathode of the first filter capacitor C2. The emitter of the transistor T2 can be connected to the control module 11, and the anode of the voltage stabilizing diode D6 can also be connected to the control module 11.

[0093] Optionally, the control module 11 is specifically used for:

[0094] The first power tube Q1 is controlled according to the terminal voltage of the submodule capacitor Cin and the current flowing through the first coupling inductor L1. Alternatively, the first power tube Q1 is controlled according to the terminal voltage of the first energy storage capacitor C1.

[0095] The second power tube Q2 is controlled according to the terminal voltage of the first energy storage capacitor C1 and the current flowing through the second coupling inductor L2.

[0096] Furthermore, the control module 11 is specifically used for:

[0097] When the fluctuation amount of the terminal voltage of the submodule capacitor Cin exceeds the preset first fluctuation range and the current flowing through the first coupling inductor L1 reaches the preset first current threshold, the first power tube Q1 is controlled to be turned off. Alternatively, when the terminal voltage of the first energy storage capacitor Cin reaches the preset voltage threshold, the first power tube Q1 is controlled to be turned off.

[0098] When the fluctuation amount of the terminal voltage of the first energy storage capacitor C1 exceeds the preset second fluctuation range and the current flowing through the second coupling inductor L2 reaches the preset second current threshold, the second power tube Q2 is controlled to be turned off.

[0099] In the above process of controlling the first power tube Q1 and the second power tube Q2 to turn off, even if the terminal voltage of the second filter capacitor C3 fluctuates, the second voltage stabilizing branch can ensure the voltage stability of the control unit. In order to reduce the fluctuation range of the second filter capacitor C3 and the first filter capacitor C2, feedback control of the first power tube Q1 and the first power tube Q2 can be implemented based on the voltage of the first energy storage capacitor C1, the current flowing through the first coupling inductor, or the terminal voltage of the submodule capacitor.

[0100] Optional, reference Figure 4 , the energy taking circuit 10 is used for:

[0101] The first power tube Q1 is turned on, the submodule capacitor Cin is discharged, the current flowing through the first coupling inductor L1 increases, and the first energy storage capacitor C1 starts to charge, and the voltage of the first energy storage capacitor C1 increases.

[0102] The first power tube Q1 is turned off, and the first part of energy E1 is provided to the control unit through the first coupling inductor. It can be imagined that the voltage of the first energy storage capacitor C1 no longer increases.

[0103] The second power tube Q2 is turned on, the first energy storage capacitor C1 is discharged, the current flowing through the second coupling inductor L2 increases, and the voltage of the first energy storage capacitor C1 decreases.

[0104] The second power tube Q2 is turned off, and the second part of energy E2 is provided to the control module 11 through the second coupled inductor L2.

[0105] After the second power tube Q2 is turned off, after a preset delay, it can continue to return to control the first power tube Q1 to be turned on, and the above process is repeated. The embodiment of the present application will not be described in detail.

[0106] The present application realizes complementary control of the first power tube Q1 and the second power tube Q2 through a control module. By adjusting the conduction time and the switching period of the first power tube Q1 and the second power tube Q2 respectively, the energy transmitted to the control unit and the control module can be controlled, thereby adjusting the output voltage of the energy extraction circuit.

[0107] For example, Figure 5 As shown, the storage module 12 further includes a dynamic control unit 121 , and the dynamic control unit 121 is connected in parallel with the first energy storage capacitor C1 .

[0108] The dynamic control unit is used to: control the capacitance of the first energy storage capacitor C1.

[0109] For further reference, Figure 5 The dynamic control unit 121 includes a first control branch and a second control branch connected in parallel.

[0110] The first control branch includes a second energy storage capacitor C4 and a third power tube Q3 connected in series. The second control branch includes a third energy storage capacitor C5 and a fourth power tube Q4 connected in series. Among them, the anode of the second energy storage capacitor C4 is connected to the anode of the first energy storage capacitor C1, the cathode of the second energy storage capacitor C4 is connected to the drain of the third power tube Q3, and the source of the third power tube Q3 is connected to the drain of the first power tube Q1. The anode of the third energy storage capacitor C5 is connected to the anode of the first energy storage capacitor C1, the cathode of the third energy storage capacitor C5 is connected to the drain of the fourth power tube Q4, and the source of the fourth power tube Q4 is connected to the drain of the first power tube Q1. The control electrodes of the third power tube Q3 and the fourth power tube Q4 are respectively connected to the control module 11 ( Figure 5 not shown).

[0111] Optionally, the third power tube Q3 is an IGBT or a MOS tube, etc. In the embodiment of the present application, the third power tube Q3 may be an NMOS tube. Similarly, the fourth power tube Q4 is an IGBT or a MOS tube, etc. In the embodiment of the present application, the fourth power tube Q4 may be an NMOS tube.

[0112] Optionally, the energy acquisition circuit 10 is used for:

[0113] like Figure 6 As shown, the first power tube Q1, the third power tube Q3 and the fourth power tube Q4 are turned on in sequence, and the second power tube Q2 is turned off, and the first energy storage capacitor C1, the second energy storage capacitor C4 and the third energy storage capacitor C5 start to charge respectively. When the voltage of the first energy storage capacitor C1, the second energy storage capacitor C4 and the third energy storage capacitor C5 reaches the preset voltage threshold, the first power tube Q1, the third power tube Q3 and the fourth power tube Q4 are all turned off.

[0114] The second power tube Q2 is turned on, the first power tube Q1, the third power tube Q3 and the fourth power tube Q4 are all turned off, the first energy storage capacitor C1 is discharged, the second energy storage capacitor C4 is discharged through the diode anti-parallel to the third power tube Q3, and the third energy storage capacitor C4 is discharged through the diode anti-parallel to the fourth power tube Q4.

[0115] When the terminal voltage of the submodule capacitor is low, more control branches can be connected in parallel to the first storage capacitor C1 to increase the current flowing through the second coupling inductor L2, thereby transmitting more energy. Conversely, when the terminal voltage of the submodule capacitor is high, the control branch connected in parallel with the first energy storage capacitor C1 can be cut out to reduce the current of the second coupling inductor L2, thereby reducing the transmitted energy.

[0116] An embodiment of the present application further provides an electronic device, including a circuit board and the above-mentioned energy extraction circuit, wherein the energy extraction circuit is arranged on the circuit board.

[0117] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. An energy-taking circuit, characterized in that: It includes a control module, a storage module, a first supply module and a second supply module; The control module is used to: control the storage module and the second supply module; The storage module is used to: under the control of the control module, transmit the first part of the energy discharged by the submodule capacitor to the first supply module, and store the second part of the energy discharged by the submodule capacitor; The first supply module is used to: supply power to the control unit in the submodule according to the first part of energy; The second supply module is used to: under the control of the control module, supply power to the control module according to the second portion of energy.

2. The energy harvesting circuit according to claim 1, characterized in that: The storage module includes a first rectifier diode, a first current limiting resistor, a first coupling inductor, a first energy storage capacitor and a first power tube; The anode of the first rectifier diode is connected to the positive electrode of the submodule capacitor, the cathode of the first rectifier diode is connected to the first end of the first coil in the first coupled inductor through the first current limiting resistor, the second end of the first coil in the first coupled inductor is connected to the positive electrode of the first energy storage capacitor, the negative electrode of the first energy storage capacitor is connected to the second electrode of the first power tube, and the first electrode of the first power tube is connected to the negative electrode of the submodule capacitor.

3. The energy harvesting circuit according to claim 2, characterized in that: The second supply module includes a storage unit and a supply unit; the storage unit is connected in parallel with the first energy storage capacitor, and the supply unit is coupled with the storage unit; The storage unit is used to: under the control of the control module, transmit the second part of energy to the supply unit; The supply unit is used to: supply power to the control module according to the second portion of energy.

4. The energy harvesting circuit according to claim 3, characterized in that: The storage unit includes a second rectifier diode, a second current limiting resistor, a second coupled inductor and a second power tube; The anode of the second rectifier diode is connected to the positive electrode of the first energy storage capacitor, the cathode of the second rectifier diode is connected to the first end of the first coil in the second coupled inductor through the second current limiting resistor, the second end of the first coil in the second coupled inductor is connected to the second electrode of the second power tube, and the first electrode of the second power tube is connected to the negative electrode of the first energy storage capacitor.

5. The energy harvesting circuit according to claim 4, characterized in that: The supply unit includes a third rectifier diode and a first filter capacitor; The anode of the third rectifier diode is connected to the first end of the second coil in the second coupled inductor; the cathode of the third rectifier diode is connected to the positive electrode of the first filter capacitor, serving as the first output end of the supply unit; the negative electrode of the first filter capacitor is connected to the second end of the second coil in the second coupled inductor, serving as the second output end of the supply unit.

6. The energy harvesting circuit according to claim 5, characterized in that: The first supply module includes a fourth rectifier diode and a second filter capacitor; The anode of the fourth rectifier diode is connected to the first end of the second coil in the first coupled inductor; the cathode of the fourth rectifier diode is connected to the positive electrode of the second filter capacitor, serving as the first output end of the first supply module; the negative electrode of the second filter capacitor is connected to the second end of the second coil in the first coupled inductor, serving as the second output end of the first supply module.

7. The energy harvesting circuit according to claim 6, characterized in that: The supply unit further includes a first voltage stabilizing branch, wherein the first voltage stabilizing branch is connected in parallel with the first filter capacitor; The first supply module further includes a second voltage stabilizing branch, and the second voltage stabilizing branch is connected in parallel with the second filter capacitor.

8. The energy harvesting circuit according to claim 7, characterized in that: The control module is specifically used for: Controlling the first power tube according to the terminal voltage of the submodule capacitor and the current flowing through the first coupled inductor; or controlling the first power tube according to the terminal voltage of the first energy storage capacitor; The second power tube is controlled according to the terminal voltage of the first energy storage capacitor and the current flowing through the second coupled inductor.

9. The energy harvesting circuit according to claim 8, characterized in that: The control module is specifically used for: When the fluctuation amount of the terminal voltage of the submodule capacitor exceeds a preset first fluctuation range and the current flowing through the first coupled inductor reaches a preset first current threshold, the first power tube is controlled to be turned off; or, when the terminal voltage of the first energy storage capacitor reaches a preset voltage threshold, the first power tube is controlled to be turned off; When the fluctuation amount of the terminal voltage of the first energy storage capacitor exceeds a preset second fluctuation range and the current flowing through the second coupled inductor reaches a preset second current threshold, the second power tube is controlled to be turned off.

10. The energy harvesting circuit according to claim 4, characterized in that: The control module is specifically used for: When the voltage required by the control unit increases, the conduction time of the first power tube is shortened; or, when the voltage required by the control unit decreases, the conduction time of the first power tube is prolonged; When the voltage required by the control module increases, the conduction time of the second power tube is shortened; or when the voltage required by the control module decreases, the conduction time of the second power tube is prolonged.

11. The energy harvesting circuit according to claim 6, characterized in that: The energy taking circuit is used for: The first power tube is turned on, the submodule capacitor is discharged, the current flowing through the first coupled inductor increases, and the first energy storage capacitor is charged; The first power tube is turned off, and the first part of energy is provided to the control unit through the first coupled inductor; The second power tube is turned on, the first energy storage capacitor is discharged, and the current flowing through the second coupled inductor increases; The second power tube is turned off, and the second part of energy is provided to the control module through the second coupled inductor.

12. The energy harvesting circuit according to claim 2, characterized in that: The storage module further includes a dynamic control unit, and the dynamic control unit is connected in parallel with the first energy storage capacitor; The dynamic control unit is used to: control the capacitance of the first energy storage capacitor.

13. The energy harvesting circuit according to claim 12, characterized in that: The dynamic control unit includes a first control branch and a second control branch connected in parallel; The first regulating branch includes a second energy storage capacitor and a third power tube connected in series; The second regulating branch includes a third energy storage capacitor and a fourth power tube connected in series.

14. The energy harvesting circuit according to claim 13, characterized in that: The energy taking circuit is used for: The first power tube, the third power tube and the fourth power tube are turned on in sequence, and the second power tube is turned off, and the first energy storage capacitor, the second energy storage capacitor and the third energy storage capacitor start to charge respectively; when the voltage of the first energy storage capacitor, the second energy storage capacitor and the third energy storage capacitor reaches a preset voltage threshold, the first power tube, the third power tube and the fourth power tube are all turned off; The second power tube is turned on, the first power tube, the third power tube and the fourth power tube are all turned off, the first energy storage capacitor is discharged, the second energy storage capacitor is discharged through the diode anti-parallel to the third power tube, and the third energy storage capacitor is discharged through the diode anti-parallel to the fourth power tube.

15. An electronic device, characterized in that: It comprises a circuit board and an energy extraction circuit as claimed in any one of claims 1 to 14; the energy extraction circuit is arranged on the circuit board.

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