Leakage inductance energy conversion circuit and system

Abstract

The utility model provides a leakage inductance energy conversion circuit and system.The leakage inductance energy conversion circuit comprises a leakage inductance energy absorption module and an auxiliary power supply module, and the input end of the leakage inductance energy absorption module is connected to the leakage inductance energy absorption end provided by a bidirectional DC / DC module; the output end of the leakage inductance energy absorption module is connected to the input end of the auxiliary power supply module, and the output end of the auxiliary power supply module is connected to a given power utilization system. Leakage inductance energy absorption and uninterruptible power supply integration of the bidirectional DC / DC module are realized through the leakage inductance energy absorption module and the auxiliary power supply module, and the circuit size and cost are reduced.

Description

Technical Field

[0001] This application relates to the field of battery energy storage technology, and in particular to a leakage inductance energy conversion circuit and system. Background Technology

[0002] Full-wave rectifier circuits are particularly suitable for high-current applications due to their low conduction losses. However, because the body diode of the MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) in a full-wave rectifier has unidirectional conduction characteristics, the following risks may arise when a full-wave rectifier circuit is used in a bidirectional DC / DC topology composed of a PWM modulator:

[0003] When a bidirectional DC / DC topology is in the charging state, its secondary leakage inductance will have its freewheeling circuit cut off due to the turn-off of its corresponding MOSFET. At this time, the leakage inductance energy will cause voltage spikes to be superimposed on the MOSFET. If no treatment is done, the MOSFET will be broken down by the voltage spike. Existing technologies usually provide spike absorption circuits to consume leakage inductance energy, but the spike absorption circuits provided in traditional technologies have high losses and high costs, and the leakage inductance energy is not effectively utilized, resulting in resource waste. Utility Model Content

[0004] In view of this, the purpose of this application is to provide at least one leakage inductance energy conversion circuit and system. This application achieves leakage inductance energy absorption and uninterruptible power supply integration of bidirectional DC / DC module through leakage inductance energy absorption module and auxiliary power supply module, thereby reducing circuit size and cost while making effective use of leakage inductance energy and avoiding resource waste.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, embodiments of this application provide a leakage inductance energy conversion circuit, which includes a leakage inductance energy absorption module and an auxiliary power supply module. The input terminal of the leakage inductance energy absorption module is connected to the leakage inductance energy absorption terminal provided by a bidirectional DC / DC module, the output terminal of the leakage inductance energy absorption module is connected to the input terminal of the auxiliary power supply module, and the output terminal of the auxiliary power supply module is connected to a given power consumption system.

[0007] In one possible implementation, the leakage inductance energy absorption module includes a first leakage inductance energy absorption unit and a second leakage inductance energy absorption unit, wherein the input terminals of the first leakage inductance energy absorption unit and the second leakage inductance energy absorption unit are connected to the leakage inductance energy absorption terminal provided by the bidirectional DC / DC module.

[0008] In one possible implementation, the leakage inductor energy absorption terminal includes a first secondary leakage inductor energy absorption terminal, an energy absorption common terminal, and a second secondary leakage inductor energy absorption terminal, wherein the first input terminal of the first leakage inductor energy absorption unit is connected to the first secondary leakage inductor energy absorption terminal; the second input terminal of the first leakage inductor energy absorption unit is connected to the first input terminal of the second leakage inductor energy absorption unit and then connected to the energy absorption common terminal; the second input terminal of the second leakage inductor energy absorption unit is connected to the second secondary leakage inductor energy absorption terminal.

[0009] In one possible implementation, the first leakage inductance energy absorption unit includes a first auxiliary transformer assembly and a first full-bridge rectifier assembly, and the second leakage inductance energy absorption unit includes a second auxiliary transformer assembly and a second full-bridge rectifier assembly. The first primary input terminal of the first auxiliary transformer assembly is connected to the first secondary leakage inductance energy absorption terminal; the second primary input terminal of the first auxiliary transformer assembly is connected to the first primary input terminal of the second auxiliary transformer assembly and then connected to a common energy absorption terminal; the second primary input terminal of the second auxiliary transformer assembly is connected to the second secondary leakage inductance energy absorption terminal; the secondary winding of the first auxiliary transformer assembly is connected to the rectifier input terminal of the first full-bridge rectifier assembly; the secondary winding of the second auxiliary transformer assembly is connected to the rectifier input terminal of the second full-bridge rectifier assembly; the first connection terminal of the first full-bridge rectifier assembly is connected to the first connection terminal of the second full-bridge rectifier assembly and the first input terminal of the auxiliary power supply module; the second connection terminal of the first full-bridge rectifier assembly is connected to the second connection terminal of the second full-bridge rectifier assembly and the second input terminal of the auxiliary power supply module.

[0010] In one possible implementation, the bidirectional DC / DC module includes a full-wave rectifier transformer, a first secondary leakage inductor, a first control switch, a second secondary leakage inductor, a second control switch, and a harmonic unit. The primary side of the full-wave rectifier transformer is connected to a PWM modulator. The first secondary winding output circuit of the full-wave rectifier transformer is formed sequentially through the first secondary leakage inductor, the first control switch, the harmonic unit, and the secondary common terminal. The second secondary winding output circuit of the full-wave rectifier transformer is formed through the second secondary leakage inductor, the second control switch, the harmonic unit, and the secondary common terminal. A terminal is led out between the first secondary leakage inductor and the first control switch as an energy absorption terminal for the first secondary leakage inductor. A terminal is led out between the second secondary leakage inductor and the second control switch as an energy absorption terminal for the second secondary leakage inductor. A terminal is led out from the secondary common terminal of the full-wave rectifier transformer as an energy absorption common terminal.

[0011] In one possible implementation, the full-bridge rectifier assembly includes a first rectifier bridge arm and a second rectifier bridge arm. The midpoint of the first rectifier bridge arm is connected to a first connection terminal of the secondary winding of the auxiliary transformer assembly, and the midpoint of the second rectifier bridge arm is connected to a second connection terminal of the secondary winding of the auxiliary transformer assembly. After the cathode terminals of the first and second rectifier bridge arms are connected, they serve as the first connection terminal of the full-bridge rectifier assembly and are connected to the first input terminal of the auxiliary power supply module. After the anode terminals of the first and second rectifier bridge arms are connected, they serve as the second connection terminal of the full-bridge rectifier assembly and are connected to the second input terminal of the auxiliary power supply module.

[0012] In one possible implementation, the leakage inductance energy absorption module further includes an energy storage unit, wherein one end of the energy storage unit is connected to the first connection terminal of the full-bridge rectifier assembly and the first input terminal of the auxiliary power supply module, and the other end of the energy storage unit is connected to the second connection terminal of the full-bridge rectifier assembly and the second input terminal of the auxiliary power supply module.

[0013] In one possible implementation, the auxiliary power supply module includes a DC auxiliary power supply unit and an AC auxiliary power supply unit, wherein a first input terminal of the DC auxiliary power supply unit is connected to a first connection terminal of the full-bridge rectifier assembly, a second input terminal of the DC auxiliary power supply unit is connected to a second connection terminal of the full-bridge rectifier assembly, and an output terminal of the DC auxiliary power supply unit is connected to a given power system; the output terminal of the AC auxiliary power supply unit is connected to the given power system.

[0014] In one possible implementation, the auxiliary power supply module includes a DC-DC power conversion component and a first isolation component, wherein a first input terminal of the DC-DC power conversion component is connected to a first connection terminal of the full-bridge rectifier component, a second input terminal of the DC-DC power conversion component is connected to a second connection terminal of the full-bridge rectifier component, an output terminal of the DC-DC power conversion component is connected to the anode of the first isolation component, and the cathode of the first isolation component is connected to a given power system.

[0015] In one possible implementation, the AC auxiliary power supply unit includes an AC-DC power conversion component and a second isolation component, wherein the output terminal of the AC-DC power conversion component is connected to the anode of the second isolation component, and the cathode of the second isolation component is connected to a given power system.

[0016] Secondly, embodiments of this application also provide a leakage inductance energy conversion system, which includes a bidirectional DC / DC module and a leakage inductance energy conversion circuit provided in any of the above embodiments. The input terminal of the leakage inductance energy absorption module is connected to the leakage inductance energy absorption terminal provided by the bidirectional DC / DC module, the output terminal of the leakage inductance energy absorption module is connected to the input terminal of the auxiliary power supply module, and the output terminal of the auxiliary power supply module is connected to a given power consumption system.

[0017] This application provides a leakage inductance energy conversion circuit and system. The leakage inductance energy conversion circuit includes a leakage inductance energy absorption module and an auxiliary power supply module. The input terminal of the leakage inductance energy absorption module is connected to the leakage inductance energy absorption terminal provided by the bidirectional DC / DC module, and the output terminal of the leakage inductance energy absorption module is connected to the input terminal of the auxiliary power supply module. The output terminal of the auxiliary power supply module is connected to a given power system. By using the leakage inductance energy absorption module and the auxiliary power supply module together, leakage inductance energy absorption and uninterruptible power supply integration of the bidirectional DC / DC module are achieved, reducing circuit size and cost.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This diagram illustrates the structure of a bidirectional DC / DC module provided by the prior art.

[0021] Figure 2 This illustration shows a circuit diagram of the secondary leakage inductor charging in a bidirectional DC / DC module according to an embodiment of this application.

[0022] Figure 3 A circuit diagram of a spike voltage absorption scheme provided by the prior art is shown;

[0023] Figure 4 This illustration shows a risk diagram of a bidirectional DC / DC module when the secondary power supply fails, according to an embodiment of this application.

[0024] Figure 5 This illustration shows one of the structural schematic diagrams of a leakage inductor energy conversion system provided in an embodiment of this application;

[0025] Figure 6 This is a second schematic diagram of the structure of a leakage inductor energy conversion system provided in an embodiment of this application;

[0026] Figure 7 The third schematic diagram shows the structure of a leakage inductance energy conversion system provided in the embodiments of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0028] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] Please see Figure 1 , Figure 1 A schematic diagram of the structure of a bidirectional DC / DC module provided by the prior art is shown. For example... Figure 1 As shown, the bidirectional DC / DC module includes a PWM modulator 1, a full-wave rectifier transformer T1, a first secondary leakage inductance LK1, a first control switch S1, a second secondary leakage inductance LK2, a second control switch S2, and a harmonic unit 2, wherein the filter inductor Lo and the filter capacitor Co are connected in series to form the harmonic unit 2.

[0030] The primary side of the full-wave rectifier transformer T1 is connected to the PWM modulator 1. The first secondary side terminal of the full-wave rectifier transformer T1 is connected to the first secondary side leakage inductance LK1, the first control switch S1, the filter inductor Lo, the filter capacitor Co and the secondary side common terminal in sequence to form the first secondary side winding output circuit.

[0031] The second secondary winding output circuit of the full-wave rectifier transformer T1 is formed by the second secondary leakage inductance LK2, the second control switch S2, the filter inductor Lo, the filter capacitor Co, and the secondary common terminal.

[0032] Optionally, the first control switch S1 and the second control switch S2 are selected from MOSFETs, specifically as follows: Figure 1The first control switch S1 and the second control switch S2 are both NMOS. The first control switch S1 is connected in series between the first secondary leakage inductance LK1 and the filter inductance Lo through its source and drain. The second control switch S2 is connected in series between the second secondary leakage inductance LK2 and the filter inductance Lo through its source and drain.

[0033] like Figure 1 The provided bidirectional DC / DC module has the following problems during operation:

[0034] (1) Leakage inductance freewheeling circuit problem:

[0035] like Figure 1 When the first secondary leakage inductor LK1 and the second secondary leakage inductor LK2 discharge, the current on the first secondary leakage inductor LK1 can be freewheeled through the body diode of the first control switch S1, and the current on the second secondary leakage inductor LK2 can be freewheeled through the body diode of the second control switch S2. Therefore, the turning off of the first control switch S1 and / or the second control switch S2 will not generate a spike voltage on the control switch.

[0036] Please see Figure 2 , Figure 2 This illustration shows a circuit diagram of the secondary leakage inductance charging in a bidirectional DC / DC module according to an embodiment of this application. Figure 2 As shown in a1, when both the first control switch S1 and the second control switch S2 are turned on, the first secondary leakage inductance LK1, the second secondary leakage inductance LK2, and the filter inductance Lo are in a charging and energy storage state. At this time, the first secondary side of the full-wave rectifier transformer T1, the filter capacitor Co, and the filter inductance Lo form the first energy storage circuit through the turned-on first control switch S1 and the first secondary leakage inductance LK1. The first secondary side of the full-wave rectifier transformer T1, the filter capacitor Co, and the filter inductance Lo form the second energy storage circuit through the turned-on second control switch S2 and the second secondary leakage inductance LK2.

[0037] When the secondary leakage inductance is charging, the first control switch S1 is off, and the second control switch S2 is on, such as Figure 2 As shown in a2, at this time, due to the disconnection of the first control switch S1, the freewheeling circuit corresponding to the first secondary leakage inductance LK1 is completely cut off due to the unidirectional conductivity of the diode inside the control switch. The first secondary leakage inductance LK1 will cause a voltage spike to be superimposed on the first control switch S1, which will cause the first control switch S1 to break down. Existing technology usually uses a spike absorption circuit to prevent the control switch that is subjected to the spike voltage from being broken down.

[0038] Please see Figure 3 , Figure 3 A circuit diagram of a spike voltage absorption scheme provided by the prior art is shown. For example... Figure 3As shown, the existing technology introduces an auxiliary transformer component T2 to absorb voltage spikes. One end of the auxiliary transformer component T2 is connected between the first secondary leakage inductance LK1 and the first control switch S1, and the other end of the auxiliary transformer component T2 is connected to the common terminal of the secondary side of the full-wave rectifier transformer T1. At this time, as... Figure 3 The voltage applied to the first control switch K1 by the first side leakage inductor LK1 during charging is absorbed by the auxiliary transformer component T2.

[0039] (2) Conventional RC-based peak voltage absorption schemes generate significant losses and easily accumulate a large amount of heat when absorbing peak voltages under high current conditions, which not only reduces absorption efficiency but also hinders heat dissipation design.

[0040] (3) The freewheeling circuit problem caused by the filter inductor when the secondary power supply (power supply connected by the control switch) is powered off:

[0041] Please see Figure 4 , Figure 4 A schematic diagram illustrating the risks of a bidirectional DC / DC module when the secondary power supply fails is shown. Figure 4 As shown, when the entire bidirectional DC / DC module is in charging mode and the secondary power supply fails and loses power, both the first control switch S1 and the second control switch S2 are disconnected. The current on the filter inductor Lo has no freewheeling path, resulting in huge voltage spikes on the first control switch S1 and the second control switch S2. Since the filter inductor Lo stores a large amount of energy, if a single transformer is used to absorb the voltage spike, it is impossible to effectively suppress the large amount of energy released by the filter inductor Lo in this case. For the single transformer absorption scheme, if the energy cannot be effectively suppressed or released, the first control switch S1 and the second control switch S2 will also be instantly broken down by the remaining unabsorbed energy.

[0042] To solve the above problems, the traditional implementation plan is as follows:

[0043] (1) Increase the absorption power of the peak voltage absorption scheme.

[0044] (2) Use an uninterruptible power supply to avoid power failure of the secondary power supply.

[0045] The two solutions mentioned above are designed independently, resulting in large circuit system size, high cost, and low efficiency.

[0046] Based on this, this application provides a leakage inductance energy conversion circuit and system, which achieves leakage inductance energy absorption and uninterruptible power supply integration of the bidirectional DC / DC module through a leakage inductance energy absorption module and an auxiliary power supply module, thereby reducing circuit size and cost, as detailed below:

[0047] Please see Figure 5, Figure 5 This illustration shows one of the structural schematic diagrams of a leakage inductor energy conversion system provided in an embodiment of this application. For example... Figure 5 As shown, the leakage inductance energy conversion system includes a bidirectional DC / DC module A and a leakage inductance energy conversion circuit B. The leakage inductance energy conversion circuit B includes a leakage inductance energy absorption module B1 and an auxiliary power supply module B2.

[0048] In a preferred embodiment, the structure of the bidirectional DC / DC module A provided in this application is as follows: Figure 1 This will not be elaborated upon here, such as Figure 5 As shown, the input terminal of the leakage inductance energy absorption module B1 is connected to the leakage inductance energy absorption terminal provided by the bidirectional DC / DC module A, the output terminal of the leakage inductance energy absorption module B1 is connected to the input terminal of the auxiliary power supply module B2, and the output terminal of the auxiliary power supply module B2 is connected to the given power system.

[0049] In a preferred embodiment, please refer to Figure 6 , Figure 6 This is a second schematic diagram of a leakage inductor energy conversion system provided in an embodiment of this application. (See attached diagram.) Figure 6 As shown, the leakage inductance energy absorption module B1 includes a first leakage inductance energy absorption unit B11 and a second leakage inductance energy absorption unit B12. The leakage inductance energy absorption terminal includes a first secondary leakage inductance energy absorption terminal P1, an energy absorption common terminal P1, and a second secondary leakage inductance energy absorption terminal P3.

[0050] Preferably, the first input terminal of the first leakage energy absorption unit B11 is connected to the first secondary leakage energy absorption terminal P1, the second input terminal of the first leakage energy absorption unit B11 is connected to the first input terminal of the second leakage energy absorption unit B12 and then connected to the common energy absorption terminal P2, and the second input terminal of the second leakage energy absorption unit B12 is connected to the second secondary leakage energy absorption terminal P3.

[0051] In a preferred embodiment, the first leakage inductor energy absorption unit B11 includes a first auxiliary transformer assembly B110 and a first full-bridge rectifier assembly B111, and the second leakage inductor energy absorption unit B12 includes a second auxiliary transformer assembly B120 and a second full-bridge rectifier assembly B121.

[0052] Preferably, the first primary input terminal of the first auxiliary transformer component B110 is connected to the first secondary leakage inductance energy absorption terminal P1; the second primary input terminal of the first auxiliary transformer component B110 is connected to the first primary input terminal of the second auxiliary transformer component B120 and then connected to the energy absorption common terminal P2; the second primary input terminal of the second auxiliary transformer component B120 is connected to the second secondary leakage inductance energy absorption terminal P3; the secondary winding of the first auxiliary transformer B110 is connected to the rectifier input terminal of the first full-bridge rectifier component B111; the secondary winding of the second auxiliary transformer component B120 is connected to the rectifier input terminal of the second full-bridge rectifier component B121; the first connection terminal of the first full-bridge rectifier component B111 is connected to the first connection terminal of the second full-bridge rectifier component B121 and the first input terminal of the auxiliary power supply module B2, respectively; and the second connection terminal of the first full-bridge rectifier component B111 is connected to the second connection terminal of the second full-bridge rectifier component B121 and the second input terminal of the auxiliary power supply module B2, respectively.

[0053] In this application, the auxiliary transformer assembly may be an auxiliary transformer.

[0054] In a preferred embodiment, the bidirectional DC / DC module A structure provided by the leakage inductance energy conversion system of this application is similar to... Figure 1 The same applies, so I won't go into too much detail here.

[0055] Preferred, such as Figure 6 For the bidirectional DC / DC module A, a terminal is led out between the first secondary leakage inductor LK1 and the first control switch S1 as the first secondary leakage inductor energy absorption terminal P1, and a terminal is led out between the second secondary leakage inductor LK1 and the second control switch S2 as the second secondary leakage inductor energy absorption terminal P3. A terminal is led out from the secondary common terminal of the full-wave rectifier transformer as the energy absorption common terminal P2.

[0056] In a preferred embodiment, the full-bridge rectifier assembly includes a first rectifier bridge arm and a second rectifier bridge arm. The midpoint of the first rectifier bridge arm is connected to a first connection terminal of the secondary winding of the auxiliary transformer assembly, and the midpoint of the second rectifier bridge arm is connected to a second connection terminal of the secondary winding of the auxiliary transformer assembly. The cathode terminals of the first and second rectifier bridge arms are connected together and serve as the first connection terminal of the full-bridge rectifier assembly, which is connected to the first input terminal of the auxiliary power supply module. The anode terminals of the first and second rectifier bridge arms are connected together and serve as the second connection terminal of the full-bridge rectifier assembly, which is connected to the second input terminal of the auxiliary power supply module.

[0057] In another preferred embodiment, please refer to Figure 7 , Figure 7 This is shown as a third schematic diagram of a leakage inductor energy conversion system provided in an embodiment of this application. Figure 7As shown, the first full-bridge rectifier assembly includes a first rectifier bridge arm formed by a first diode D1 and a second diode D2, and a second rectifier bridge arm formed by a third diode D3 and a fourth diode D4. The first auxiliary transformer assembly is selected from the first auxiliary transformer Tr1, and the second auxiliary transformer assembly is selected from the second auxiliary transformer Tr2.

[0058] In one specific embodiment, the cathode of the first diode D1 is connected to the anode of the second diode D2 and then connected to the first connection terminal of the secondary winding of the first auxiliary transformer Tr1. The cathode of the third diode D3 is connected to the anode of the fourth diode D4 and then connected to the second connection terminal of the secondary winding of the first auxiliary transformer Tr1. The cathode of the second diode D2 is connected to the cathode of the fourth diode D4 and then connected to the first input terminal of the auxiliary power supply module B2 as the first connection terminal of the first full-bridge rectifier assembly. The anode of the first diode D1 is connected to the anode of the third diode D3 and then connected to the second input terminal of the auxiliary power supply module B2 as the second connection terminal of the first full-bridge rectifier assembly.

[0059] In another specific embodiment, the second full-bridge rectifier assembly includes a first rectifier bridge arm formed by a fifth diode D5 and a sixth diode D6, and a second rectifier bridge arm formed by a seventh diode D7 and an eighth diode D8.

[0060] After the cathode of the fifth diode D5 is connected to the anode of the sixth diode D6, it is connected to the first connection terminal of the secondary winding of the second auxiliary transformer Tr2. After the cathode of the seventh diode D7 is connected to the anode of the eighth diode D8, it is connected to the second connection terminal of the secondary winding of the second auxiliary transformer Tr2. After the cathode of the sixth diode D6 is connected to the cathode of the eighth diode D8, it serves as the first connection terminal of the first full-bridge rectifier assembly and is connected to the first input terminal of the auxiliary power supply module B2. After the anode of the fifth diode D5 is connected to the anode of the seventh diode D7, it serves as the second connection terminal of the first full-bridge rectifier assembly and is connected to the second input terminal of the auxiliary power supply module B2.

[0061] In a preferred embodiment, such as Figure 7 As shown, the leakage inductance energy absorption module also includes an energy storage unit B13, wherein one end of the energy storage unit B13 is connected to the first connection terminal of the full-bridge rectifier assembly and the first input terminal of the auxiliary power supply module, and the other end of the energy storage unit B13 is connected to the second connection terminal of the full-bridge rectifier assembly and the second input terminal of the auxiliary power supply module.

[0062] like Figure 7 As shown, the energy storage unit can be a storage capacitor.

[0063] In a preferred embodiment, such as Figure 7As shown, the auxiliary power supply module B2 includes a DC auxiliary power supply unit B21 and an AC auxiliary power supply unit B22. The first input terminal of the DC auxiliary power supply unit B21 is connected to the first connection terminal of the first full-bridge rectifier assembly, the first connection terminal of the second full-bridge rectifier assembly, and one end of the energy storage unit B13. The second input terminal of the DC auxiliary power supply unit B21 is connected to the second connection terminal of the first full-bridge rectifier assembly, the second connection terminal of the second full-bridge rectifier assembly, and the other end of the energy storage unit B13. The output terminal of the DC auxiliary power supply unit B21 is connected to a given power system, and the output terminal of the AC auxiliary power supply unit B22 is connected to a given power system.

[0064] like Figure 7 As shown, the DC auxiliary power supply unit B21 includes a DC-DC energy conversion component B210 and a first isolation component B211. The first input terminal of the DC-DC energy conversion component B210 is connected to the first connection terminal of the first full-bridge rectifier component, the first connection terminal of the second full-bridge rectifier component, and one end of the energy storage unit B13. The second input terminal of the DC-DC energy conversion component B210 is connected to the second connection terminal of the first full-bridge rectifier component, the second connection terminal of the second full-bridge rectifier component, and the other end of the energy storage unit B13. The output terminal of the DC-DC energy conversion component B210 is connected to the anode of the first isolation component B211, and the cathode of the first isolation component B211 is connected to a given power system.

[0065] In a preferred embodiment, the AC auxiliary power supply unit B22 includes an AC-DC power conversion component B220 and a second isolation component B221, wherein the input terminal of the AC-DC power conversion component B220 is connected to the auxiliary power supply provided by the external power grid, the output terminal of the AC-DC power conversion component B220 is connected to the anode of the second isolation component B221, and the cathode of the second isolation component B221 is connected to a given power system.

[0066] Diodes can be used as isolation components.

[0067] In practical implementation, the leakage inductance energy conversion circuit provided in this application operates as follows:

[0068] (1) As Figure 7This application connects corresponding auxiliary transformers Tr1 and Tr2 in parallel to the first and second secondary windings of the full-wave rectifier transformer T1, respectively. This provides a freewheeling path for the first secondary leakage inductance LK1 and the second secondary leakage inductance LK2 when the bidirectional DC / DC module is in charging mode or the secondary power supply is off. This allows the energy generated by the first secondary leakage inductance LK1 and / or the second secondary leakage inductance LK2 to be freewheeled through the circuit connected to the auxiliary transformers Tr1 and Tr2, thereby preventing the first secondary leakage inductance LK1 and the second secondary leakage inductance LK2 from generating voltage spikes on their corresponding control switches and causing damage to the control switches.

[0069] (2) For auxiliary transformers Tr1 and / or Tr2, the leakage inductance energy received from the corresponding secondary leakage inductance is transferred to the secondary side of auxiliary transformers Tr1 and / or Tr2. The secondary side of auxiliary transformers Tr1 and / or Tr2 stores the leakage inductance energy in the energy storage unit B13 through the corresponding full-bridge rectification and provides the input voltage for the subsequent DC-DC energy conversion component B210.

[0070] (3) The DC-DC power conversion component B210 converts the voltage after full-bridge rectification into the required stable auxiliary power supply. This auxiliary power supply obtained by the DC-DC power conversion component B210 competes for power supply with the auxiliary power supply provided by the external power grid through an isolation component. The one with the higher output voltage is given priority to supply power to the given power system. The given power system includes, but is not limited to, at least one of the following:

[0071] Control systems and fan cooling systems are not specifically limited in this application for a given power system.

[0072] In this application, when a given power system is powered by a DC auxiliary power supply unit B21, the stored leakage inductance energy can be consumed.

[0073] The advantages of this application are:

[0074] (1) Improve system efficiency: Compared with the traditional RC absorption and dissipation method, the leakage inductance energy absorption and transfer method can make more effective use of the transformer leakage inductance energy, reduce energy waste, and thus improve system efficiency. By reasonably designing the leakage inductance energy absorption circuit, the leakage inductance energy can be transferred to other energy storage components to realize energy recovery and reuse.

[0075] (2) Reduce system heat loss: Traditional RC leakage inductance energy absorption circuits convert leakage inductance energy into heat energy, which increases the system heat loss. The leakage inductance energy conversion circuit provided in this application can transfer leakage inductance energy to other useful places, reduce heat generation, lower system temperature, and improve system reliability and lifespan.

[0076] (3) Solved the problem of secondary power supply failure: The auxiliary power supply module provided by the leakage inductance energy conversion circuit of this application provides power to the leakage inductance energy conversion system by the auxiliary power supply provided by the external power grid when the system is not started, and starts the entire leakage inductance energy conversion system. When the leakage inductance energy conversion system is running, the DC auxiliary power supply unit B21 outputs a voltage higher than the auxiliary power supply provided by the AC auxiliary power supply unit B22. At this time, the auxiliary power supply provided by the AC auxiliary power supply unit B22 is cut off, and the DC auxiliary power supply unit B21 completes the subsequent power supply for the leakage inductance energy conversion system. At the same time, the DC auxiliary power supply unit B21 can also consume the absorbed transformer leakage inductance energy, ensuring that the secondary power supply will not fail during system operation. As long as the system is running, the DC auxiliary power supply unit B21 will always exist, providing a stable power supply for the system.

[0077] (4) Reduce the risk of power supply anomalies: The existence of two power supplies, AC auxiliary power supply unit B22 and DC auxiliary power supply unit B21, increases the power supply redundancy of the system and reduces the risk of power supply anomalies. Even if one power supply fails, the other power supply can continue to supply power to the system, ensuring the stability and reliability of the system.

[0078] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0079] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0081] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0082] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A leakage energy conversion circuit, characterized by, The leakage inductor energy conversion circuit includes a leakage inductor energy absorption module and an auxiliary power supply module. The input terminal of the leakage inductance energy absorption module is connected to the leakage inductance energy absorption terminal provided by the bidirectional DC / DC module, the output terminal of the leakage inductance energy absorption module is connected to the input terminal of the auxiliary power supply module, and the output terminal of the auxiliary power supply module is connected to the given power system.

2. The leakage energy conversion circuit of claim 1, wherein, The leakage inductance energy absorption module includes a first leakage inductance energy absorption unit and a second leakage inductance energy absorption unit. The input terminals of the first leakage inductance energy absorption unit and the second leakage inductance energy absorption unit are connected to the leakage inductance energy absorption terminal provided by the bidirectional DC / DC module.

3. The leakage energy conversion circuit of claim 2, wherein, The leakage inductor energy absorption terminal includes a first secondary leakage inductor energy absorption terminal, a common energy absorption terminal, and a second secondary leakage inductor energy absorption terminal. Wherein, the first input terminal of the first leakage inductance energy absorption unit is connected to the first secondary leakage inductance energy absorption terminal; The second input terminal of the first leakage inductance energy absorption unit is connected to the first input terminal of the second leakage inductance energy absorption unit and then connected to the common energy absorption terminal. The second input terminal of the second leakage inductance energy absorption unit is connected to the second secondary leakage inductance energy absorption terminal.

4. The leakage inductance energy conversion circuit according to claim 3, characterized in that, The first leakage inductor energy absorption unit includes a first auxiliary transformer assembly and a first full-bridge rectifier assembly; the second leakage inductor energy absorption unit includes a second auxiliary transformer assembly and a second full-bridge rectifier assembly. Wherein, the first primary input terminal of the first auxiliary transformer component is connected to the first secondary leakage inductor energy absorption terminal, the second primary input terminal of the first auxiliary transformer component is connected to the first primary input terminal of the second auxiliary transformer component and then connected to the energy absorption common terminal, and the second primary input terminal of the second auxiliary transformer component is connected to the second secondary leakage inductor energy absorption terminal. The secondary winding of the first auxiliary transformer assembly is connected to the rectifier input terminal of the first full-bridge rectifier assembly, and the secondary winding of the second auxiliary transformer assembly is connected to the rectifier input terminal of the second full-bridge rectifier assembly. The first connection terminal of the first full-bridge rectifier is connected to the first connection terminal of the second full-bridge rectifier and the first input terminal of the auxiliary power supply module, respectively. The second connection terminal of the first full-bridge rectifier is connected to the second connection terminal of the second full-bridge rectifier and the second input terminal of the auxiliary power supply module, respectively.

5. The leakage energy conversion circuit of claim 3, wherein, The bidirectional DC / DC module includes a full-wave rectifier transformer, a first secondary leakage inductor, a first control switch, a second secondary leakage inductor, a second control switch, and a harmonic unit. The primary side of the full-wave rectifier transformer is connected to the PWM modulator. The first secondary side terminal of the full-wave rectifier transformer forms the first secondary winding output circuit through the first secondary leakage inductance, the first control switch, the harmonic unit and the secondary common terminal in sequence. The second secondary side terminal of the full-wave rectifier transformer forms the second secondary winding output circuit through the second secondary leakage inductance, the second control switch, the harmonic unit and the secondary common terminal. Specifically, a terminal is led out between the first secondary leakage inductor and the first control switch as the energy absorption terminal of the first secondary leakage inductor; a terminal is led out between the second secondary leakage inductor and the second control switch as the energy absorption terminal of the second secondary leakage inductor; and a terminal is led out from the secondary common terminal of the full-wave rectifier transformer as the energy absorption common terminal.

6. The leakage energy conversion circuit of claim 4, wherein, The full-bridge rectifier assembly includes a first rectifier arm and a second rectifier arm. The midpoint of the first rectifier bridge arm is connected to the first connection terminal of the secondary winding of the auxiliary transformer assembly, and the midpoint of the second rectifier bridge arm is connected to the second connection terminal of the secondary winding of the auxiliary transformer assembly. After the cathode terminals of the first rectifier bridge arm and the second rectifier bridge arm are connected, they serve as the first connection terminal of the full-bridge rectifier assembly and are connected to the first input terminal of the auxiliary power supply module. After the anode terminals of the first rectifier bridge arm and the second rectifier bridge arm are connected, they serve as the second connection terminal of the full-bridge rectifier assembly and are connected to the second input terminal of the auxiliary power supply module.

7. The leakage energy conversion circuit of claim 6, wherein, The leakage inductance energy absorption module also includes an energy storage unit. One end of the energy storage unit is connected to the first connection terminal of the full-bridge rectifier and the first input terminal of the auxiliary power supply module, and the other end of the energy storage unit is connected to the second connection terminal of the full-bridge rectifier and the second input terminal of the auxiliary power supply module.

8. The leakage energy conversion circuit of claim 6, wherein, The auxiliary power supply module includes a DC auxiliary power supply unit and an AC auxiliary power supply unit. Wherein, the first input terminal of the DC auxiliary power supply unit is connected to the first connection terminal of the full-bridge rectifier assembly, the second input terminal of the DC auxiliary power supply unit is connected to the second connection terminal of the full-bridge rectifier assembly, and the output terminal of the DC auxiliary power supply unit is connected to the given power system; The output terminal of the AC auxiliary power supply unit is connected to the given power system.

9. The leakage energy conversion circuit of claim 8, wherein, The DC auxiliary power supply unit includes a DC-DC energy conversion component and a first isolation component. Wherein, the first input terminal of the DC-DC energy conversion component is connected to the first connection terminal of the full-bridge rectifier component, the second input terminal of the DC-DC energy conversion component is connected to the second connection terminal of the full-bridge rectifier component, the output terminal of the DC-DC energy conversion component is connected to the anode of the first isolation component, and the cathode of the first isolation component is connected to the given power system.

10. The leakage energy conversion circuit of claim 8, wherein, The AC auxiliary power supply unit includes an AC-to-DC energy conversion component and a second isolation component. The output terminal of the AC-DC energy conversion component is connected to the anode of the second isolation component, and the cathode of the second isolation component is connected to the given power system.

11. A leakage energy conversion system characterized by, The leakage inductor energy conversion system includes a bidirectional DC / DC module and the leakage inductor energy conversion circuit according to any one of claims 1-10. The input terminal of the leakage inductance energy absorption module is connected to the leakage inductance energy absorption terminal provided by the bidirectional DC / DC module, the output terminal of the leakage inductance energy absorption module is connected to the input terminal of the auxiliary power supply module, and the output terminal of the auxiliary power supply module is connected to the given power system.

Images