阅读说明：本技术 一种变换器装置以及变换器装置的控制方法 (Converter device and control method thereof ) 是由 郝世强 平定钢 刘钢 于 2021-03-16 设计创作，主要内容包括：本申请提供了一种变换器装置以及变换器装置的控制方法,涉及电子电路技术领域,以提升变换器效率、功率密度和电磁兼容特性。变换器装置包括：依次相连的开关网络、谐振网络、变压器和钳位推挽网络,谐振网络包括谐振电容,谐振电容位于开关网络和变压器一次侧之间,钳位推挽网络与变压器二次侧相连,钳位推挽网络包括：第一开关管、第二开关管、钳位电容、连接第一开关管的第一电感及连接第二开关管的第二电感,变压器在靠近钳位推挽网络的二次侧方向包括第一绕组和第二绕组,第一绕组连接第一电感与第二开关管,第二绕组连接第二电感和第一开关管,变压器与钳位推挽网络均不包括除钳位电容以外的其它谐振电容。(The application provides a converter device and a control method of the converter device, and relates to the technical field of electronic circuits, so that the efficiency, the power density and the electromagnetic compatibility of the converter are improved. The inverter device includes: the switch network, resonance network, transformer and the clamp push-pull network that link to each other in proper order, resonance network include resonant capacitor, and resonant capacitor is located between switch network and the transformer primary side, and the clamp push-pull network links to each other with the transformer secondary side, and the clamp push-pull network includes: the transformer comprises a first switch tube, a second switch tube, a clamping capacitor, a first inductor connected with the first switch tube and a second inductor connected with the second switch tube, the transformer comprises a first winding and a second winding in the direction of the secondary side close to the clamping push-pull network, the first winding is connected with the first inductor and the second switch tube, the second winding is connected with the second inductor and the first switch tube, and the transformer and the clamping push-pull network do not comprise other resonant capacitors except the clamping capacitor.)

1. A transducer arrangement, characterized in that the transducer arrangement comprises: the switch network, resonance network, transformer and the clamp push-pull network that link to each other in proper order, wherein, resonance network includes resonant capacitor, and resonant capacitor is located between switch network and the transformer primary side, and the clamp push-pull network links to each other with the transformer secondary side, and the clamp push-pull network includes: the transformer comprises a first switch tube, a second switch tube, a clamping capacitor, a first inductor and a second inductor, the first inductor is connected with the first switch tube, the second inductor is connected with the second switch tube, the transformer comprises a first winding and a second winding on the secondary side close to a clamping push-pull network, the first winding is connected with the first inductor and the second switch tube, the second winding is connected with the second inductor and the first switch tube, the transformer and the clamping push-pull network do not comprise other resonant capacitors except the clamping capacitor, the first inductor and the second inductor are located on different sides of the transformer with the resonant capacitors of the resonant network, the first inductor, the second inductor and the resonant capacitors participate in resonance together, and the transformer works in a resonance state or a quasi-resonance state.

2. The converter arrangement of claim 1, wherein the first and second switching tubes are passive power switches or active power switches.

3. The converter arrangement of claim 1, wherein the first inductor and the second inductor are each a separate inductor, or an integrated inductor, or an inductor or a leakage inductor integrated with the transformer.

4. The converter arrangement of claim 1, wherein the resonant network further comprises: and the third inductor is an independent inductor, or an inductor or a leakage inductor integrated with the transformer, and the third inductor, the resonant capacitor, the first inductor and the second inductor participate in resonance together.

5. A transducer arrangement according to claim 1, wherein the direction of energy flow of the transducer is unidirectional or bidirectional.

6. The converter device according to claim 1, wherein the switching network, the resonant network, the transformer and the clamping push-pull network are connected in sequence, and a current path of the clamping push-pull network always comprises a first switching tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor, or a second switching tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor, no matter whether the operation sequence is from the switching network to the clamping push-pull network or from the clamping push-pull network to the switching network.

7. A control method of a converter apparatus, characterized in that the control method is applied to the converter apparatus according to any one of claims 1 to 6, the method comprising:

when the switching network transmits current to the clamping push-pull network, the switching frequency of the switching network is controlled to enable the resonant network, the first inductor and the second inductor to work in a resonant state or a quasi-resonant state, and the output voltage of the resonant network is converted through a transformer to obtain a first voltage;

when the clamping push-pull network receives a first voltage, controlling current to run in the clamping push-pull network according to a preset circuit, and finally obtaining a target voltage through filtering and current sharing of a first inductor and a second inductor and switching of a first switching tube and a second switching tube;

or when the clamping push-pull network transmits current to the switch network, controlling the current to run in the clamping push-pull network according to a preset circuit, and obtaining a first voltage through switching of the first switch tube and the second switch tube and filtering and current sharing of the first inductor and the second inductor;

controlling the switching frequency of the clamping push-pull network, converting the switching frequency by a transformer, transmitting a first voltage to the resonant network, enabling the resonant network, the first inductor and the second inductor to work in a resonant state or a quasi-resonant state, and finally rectifying the voltage by the switching network to obtain a target voltage;

the preset circuit comprises a first switch tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor, or a second switch tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor.

Technical Field

The present invention relates to the field of electronic circuit technology, and in particular, to a converter device and a control method of the converter device.

Background

At present, the switching power supply is widely applied to various fields, such as aerospace, military, new energy vehicles and the like, and the requirements of the various fields on high reliability, high power density and high efficiency of the switching power supply are higher and higher along with the development of the technology.

As a power converter with high efficiency and high power density, a resonant converter has been the focus of research in the industry. The resonant converter forms a resonant network by connecting the resonant capacitor and the resonant inductor in series and in parallel, and works in a resonant or quasi-resonant state, so that the primary side switching tube realizes zero-voltage switching and the secondary side switching tube realizes zero-current switching-off, thereby reducing switching loss. The primary and secondary switch tubes have various connection modes, and the common modes include full-bridge, half-bridge, full-wave, push-pull and the like. The full-wave and push-pull connection mode is characterized in that only one switching tube is conducted at the same time, so that conduction loss is reduced, however, a converter circuit of the full-wave and push-pull connection mode contains transformer leakage inductance, and high voltage spikes can be borne when the switching tube is turned off, so that a device with higher withstand voltage needs to be selected when the device is selected, or because the device is limited in withstand voltage, higher voltage output cannot be realized, and the EMC (electromagnetic compatibility) characteristic is difficult to improve.

Disclosure of Invention

An object of the present application is to provide an inverter device and a control method of the inverter device to improve efficiency, power density, and electromagnetic compatibility characteristics of the inverter.

In a first aspect, an embodiment of the present application provides a converter apparatus, including: the switch network, resonance network, transformer and the clamp push-pull network that link to each other in proper order, wherein, resonance network includes resonant capacitor, and resonant capacitor is located between switch network and the transformer primary side, and the clamp push-pull network links to each other with the transformer secondary side, and the clamp push-pull network includes: the transformer comprises a first switch tube, a second switch tube, a clamping capacitor, a first inductor and a second inductor, the first inductor is connected with the first switch tube, the second inductor is connected with the second switch tube, the transformer comprises a first winding and a second winding on the secondary side close to a clamping push-pull network, the first winding is connected with the first inductor and the second switch tube, the second winding is connected with the second inductor and the first switch tube, the transformer and the clamping push-pull network do not comprise other resonant capacitors except the clamping capacitor, the first inductor and the second inductor are located on different sides of the transformer with the resonant capacitors of the resonant network, the first inductor, the second inductor and the resonant capacitors participate in resonance together, and the transformer works in a resonance state or a quasi-resonance state.

In one possible implementation, the first switch tube and the second switch tube are passive power switches or active power switches.

In one possible implementation, the first inductor and the second inductor are both independent inductors, or integrated inductors, or inductors integrated with the transformer or leakage inductors.

In one possible implementation, the resonant network further comprises: and the third inductor is an independent inductor, or an inductor or a leakage inductor integrated with the transformer, and the third inductor, the resonant capacitor, the first inductor and the second inductor participate in resonance together.

In one possible implementation, the direction of energy flow of the transducer is unidirectional, or bidirectional.

In one possible implementation, the switching network, the resonant network, the transformer and the clamping push-pull network are connected in sequence, and a current path of the clamping push-pull network always comprises a first switching tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor, or a second switching tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor, no matter whether the working sequence is from the switching network to the clamping push-pull network or from the clamping push-pull network to the switching network.

In a second aspect, there is provided a control method of an inverter device, the control method being applied to the inverter device described above, the method including:

when the switching network transmits current to the clamping push-pull network, the switching frequency of the switching network is controlled to enable the resonant network, the first inductor and the second inductor to work in a resonant state or a quasi-resonant state, and the output voltage of the resonant network is converted through a transformer to obtain a first voltage;

when the clamping push-pull network receives a first voltage, controlling current to run in the clamping push-pull network according to a preset circuit, and finally obtaining a target voltage through filtering and current sharing of a first inductor and a second inductor and switching of a first switching tube and a second switching tube;

or when the clamping push-pull network transmits current to the switch network, controlling the current to run in the clamping push-pull network according to a preset circuit, and obtaining a first voltage through switching of the first switch tube and the second switch tube and filtering and current sharing of the first inductor and the second inductor; controlling the switching frequency of the clamping push-pull network, converting the switching frequency by a transformer, transmitting a first voltage to the resonant network, enabling the resonant network, the first inductor and the second inductor to work in a resonant state or a quasi-resonant state, and finally rectifying the voltage by the switching network to obtain a target voltage;

the preset circuit comprises a first switch tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor, or a second switch tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor.

In one possible implementation, the first switch tube and the second switch tube are passive power switches or active power switches.

In one possible implementation, the first inductor and the second inductor are both independent inductors, or integrated inductors, or inductors integrated with the transformer or leakage inductors.

In one possible implementation, the resonant network further comprises: and the third inductor is an independent inductor, or an inductor or a leakage inductor integrated with the transformer, and the third inductor, the resonant capacitor, the first inductor and the second inductor participate in resonance together.

The embodiment of the application brings the following beneficial effects:

an embodiment of the present application provides an inverter device and a control method of the inverter device, where the inverter device includes: the switch network, resonance network, transformer and the clamp push-pull network that link to each other in proper order, wherein, resonance network includes resonant capacitor, and resonant capacitor is located between switch network and the transformer primary side, and the clamp push-pull network links to each other with the transformer secondary side, and the clamp push-pull network includes: the transformer comprises a first switch tube, a second switch tube, a clamping capacitor, a first inductor and a second inductor, the first inductor is connected with the first switch tube, the second inductor is connected with the second switch tube, the transformer comprises a first winding and a second winding on the secondary side close to a clamping push-pull network, the first winding is connected with the first inductor and the second switch tube, the second winding is connected with the second inductor and the first switch tube, the transformer and the clamping push-pull network do not comprise other resonant capacitors except the clamping capacitor, the first inductor and the second inductor are located on different sides of the transformer with the resonant capacitors of the resonant network, the first inductor, the second inductor and the resonant capacitors participate in resonance together, and the transformer works in a resonance state or a quasi-resonance state. In the scheme, the current is equalized between the first inductor and the second inductor by controlling the first switch tube and the second switch tube of the clamping push-pull network, the voltage stress of the first switch tube and the second switch tube is reduced, impedance is provided for electromagnetic interference, and the resonant capacitor, the first inductor and the second inductor participate in resonance together, so that the soft switching of the switch tubes is realized, the switching loss and the conduction loss are reduced, and the converter efficiency, the power density and the electromagnetic compatibility characteristic are improved.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic circuit diagram of a converter device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a converter device according to an embodiment of the present application;

fig. 3 is a schematic diagram of another structure of a converter device according to an embodiment of the present application;

fig. 4 is a schematic flow chart illustrating a current direction of a control method of an inverter device according to an embodiment of the present disclosure;

fig. 5 is a schematic flow chart illustrating another current direction of a control method of an inverter device according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, as referred to in the embodiments of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

At present, the switching power supply is widely applied to various fields, such as aerospace, military, new energy vehicles and the like, and the requirements of the various fields on high reliability, high power density and high efficiency of the switching power supply are higher and higher along with the development of the technology. As a power converter with high efficiency and high power density, a resonant converter has been the focus of research in the industry. The resonant converter forms a resonant network by connecting the resonant capacitor and the resonant inductor in series and in parallel, and works in a resonant or quasi-resonant state, so that the primary side switching tube realizes zero-voltage switching and the secondary side switching tube realizes zero-current switching-off, thereby reducing switching loss. The primary and secondary switch tubes have various connection modes, and the common modes include full-bridge, half-bridge, full-wave, push-pull and the like. The full-wave and push-pull connection mode is characterized in that only one switching tube is conducted at the same time, conduction loss is reduced, however, a converter circuit of the full-wave and push-pull connection mode comprises transformer leakage inductance, and high voltage spikes can be borne when the switching tube is turned off, so that a device with higher withstand voltage needs to be selected when the device is selected, or the device is limited by the withstand voltage of the device, higher voltage output cannot be realized, and the EMC characteristic is difficult to improve.

Based on this, embodiments of the present application provide an inverter device and a control method of the inverter device, by which the following advantages can be obtained: (1) two inductors connected with a clamping capacitor in the clamping push-pull network realize current sharing among a first winding and a second winding of the transformer and between a first switching tube and a second switching tube, and the reliability of the system is improved; (2) two inductors connected with the clamping capacitor in the clamping push-pull network provide natural impedance for common-mode interference, so that the EMC characteristic is improved; (3) two inductors connected with a clamping capacitor in the clamping push-pull network resonate together with a primary side resonant capacitor of the transformer, so that the circuit works in a resonant state or a quasi-resonant state, soft switching of a switching tube is realized, and switching loss is reduced; (4) the clamping capacitor in the clamping push-pull network reduces the voltage stress, the turn-off loss and the electromagnetic radiation of the first switching tube and the second switching tube; (5) the first switch tube and the second switch tube in the clamping push-pull network are only conducted at the same time, so that the advantage of small conduction loss of a traditional full-wave or push-pull circuit is inherited.

Embodiments of the present application are further described below with reference to the accompanying drawings.

Fig. 1 is a schematic circuit diagram of a converter device according to an embodiment of the present application. The inverter device includes: the switch network, resonance network, transformer and the clamp push-pull network that link to each other in proper order, wherein, resonance network includes resonant capacitor, and resonant capacitor is located between switch network and the transformer primary side, and the clamp push-pull network links to each other with the transformer secondary side, and the clamp push-pull network includes: the transformer comprises a first switch tube, a second switch tube, a clamping capacitor, a first inductor and a second inductor, the first inductor is connected with the first switch tube, the second inductor is connected with the second switch tube, the transformer comprises a first winding and a second winding on the secondary side close to a clamping push-pull network, the first winding is connected with the first inductor and the second switch tube, the second winding is connected with the second inductor and the first switch tube, the transformer and the clamping push-pull network do not comprise other resonant capacitors except the clamping capacitor, the first inductor and the second inductor are located on different sides of the transformer with the resonant capacitors of the resonant network, the first inductor, the second inductor and the resonant capacitors participate in resonance together, and the transformer works in a resonance state or a quasi-resonance state.

As shown in fig. 1, the circuit schematic of the converter device includes: a first switch tube S1, a second switch tube S2, and a clamping capacitor C_fResonant capacitor C_rTransformer T, first winding W1, second winding W2, first inductor Ls1, second inductor Ls2, DC port 1 (DC port 1), DC port 2 (DC port 2), Cdc1 (capacitor), and Cdc2 (capacitor).

Specifically, the current path of the clamp push-pull network includes two branches, which are respectively: W1-Ls 1-S1-DC Port 2 and W2-Ls 2-C_f-S1, or W1-Ls1-Cf-S2 and W2-Ls2-S2-DC port 2. It can be seen that only one switch tube of S1 or S2 is turned on in the clamped push-pull network at the same time. When the current is switched between S1 and S2, the commutation loop includes S1, S2, Cf, Cdc2 and a small amount of line parasitic inductance, excluding transformer leakage inductance, Ls1 and Ls2, and usually the line parasitic inductance is much smaller than the transformer leakage inductance, Ls1 and Ls2, so that the voltage spike at the time of turn-off of the two ends of S1 and S2 is smaller, the instantaneous voltage stress is lower, and therefore higher output voltage can be realized or a device with lower withstand voltage can be used.

In an embodiment of the present application, a converter apparatus includes: the switch network, resonance network, transformer and the clamp push-pull network that link to each other in proper order, wherein, resonance network includes resonant capacitor, and resonant capacitor is located between switch network and the transformer primary side, and the clamp push-pull network links to each other with the transformer secondary side, and the clamp push-pull network includes: the transformer comprises a first switch tube, a second switch tube, a clamping capacitor, a first inductor and a second inductor, the first inductor is connected with the first switch tube, the second inductor is connected with the second switch tube, the transformer comprises a first winding and a second winding on the secondary side close to a clamping push-pull network, the first winding is connected with the first inductor and the second switch tube, the second winding is connected with the second inductor and the first switch tube, the transformer and the clamping push-pull network do not comprise other resonant capacitors except the clamping capacitor, the first inductor and the second inductor are located on different sides of the transformer with the resonant capacitors of the resonant network, the first inductor, the second inductor and the resonant capacitors participate in resonance together, and the transformer works in a resonance state or a quasi-resonance state. In this scheme, through setting up first switch tube, second switch tube, clamp capacitance, first winding, second winding, first inductance and second inductance to control current according to predetermineeing the circuit and move in the clamp push-pull network, have following advantage: (1) the first inductor and the second inductor participate in resonance together, so that current sharing between the first winding and the second winding and between the first switching tube and the second switching tube is realized, and natural impedance is provided for common-mode current, so that the electromagnetic compatibility (EMC) characteristic of the converter is improved; (2) the circuit works in a resonance state, and all the switching tubes realize soft switching, so that the switching loss of the converter is reduced; (3) due to the existence of the clamping capacitor, the current conversion process of the first switch tube and the second switch tube is irrelevant to the leakage inductance of the transformer, so that the turn-off voltage stress, turn-off damage and electromagnetic radiation of the switch tubes are reduced; (4) only one of the first switch tube and the second switch tube is conducted at the same time, so that the conduction loss of the converter is reduced.

The above steps are described in detail below.

In some embodiments, active or passive power switching devices may be used as switching tubes, so the direction of flow of energy may be determined depending on the type of switching device. As an example, the first switch tube and the second switch tube are passive power switches or active power switches.

Specifically, the first switch tube and the second switch tube may be: the power supply comprises a metal-oxide semiconductor field effect transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), a diode and the like, wherein the MOSFET and the IGBT can realize bidirectional flow of energy, and the diode can realize unidirectional flow of energy.

As shown in fig. 2, when the first switching transistor S1 and the second switching transistor S2 are both MOSFETs, the clamping push-pull network functions as a rectifying circuit during forward operation, as an inverting circuit during reverse operation,during both operations, due to the clamping capacitor C_fAs a result, there is only a small overshoot of the instantaneous turn-off voltage in both the first switch transistor S1 and the second switch transistor S2. Under the action of the first inductor Ls1 and the second inductor Ls2, current sharing is achieved between the first winding W1 and the second winding W2, and between the first switch tube S1 and the second switch tube S2, system robustness is improved, and meanwhile natural impedance is provided for common-mode current, so that the EMC characteristic of the system is improved.

As shown in fig. 3, when the first switch tube and the second switch tube are both diodes, the clamp push-pull network can only be used as a rectifier circuit in the forward working process, and in the forward working process, due to the clamp capacitor C_fThe first switch tube and the second switch tube have only small transient turn-off voltage overshoots. Meanwhile, under the action of the first inductor Ls1 and the second inductor Ls2, current sharing is achieved between the first winding W1 and the second winding W2, and between the first switch tube S1 and the second switch tube S2.

In addition, the switch network also includes a plurality of passive power switches or active power switches, and the switch network includes a plurality of types, for example, the types include: full-bridge switching networks, half-bridge switching networks, full-wave/push-pull switching networks, multi-level switching networks, and the like, which are not limited in the present invention. As shown in fig. 2 and fig. 3, the switching network is a full-bridge switching network composed of 4 switching tubes.

It should be noted that, since the resonant network includes passive elements such as a resonant inductor and a resonant capacitor, and resonates with the secondary-side first inductor Ls1 and the secondary-side second inductor Ls2, different forms of resonant circuits, such as LLC, CLL, LC, CLLC, LCC, etc., are formed. As shown in FIG. 2, Cr and an inductor Lp form an LC resonance circuit, a full bridge circuit S3-S6 composed of 4 MOS transistors is arranged on a primary side (on the side of a switching network), a clamping push-pull circuit S1-S2 composed of 2 MOS transistors is arranged on a secondary side (on the side of a clamping push-pull network), and a capacitor C_fAnd voltage clamping of S1 and S2 is realized, and ZVS and ZCS soft switching is realized on both primary side MOS and secondary side MOS.

In some embodiments, the first inductor Ls1 and the second inductor Ls2 are each a separate inductor, or an integrated inductor, or an inductor or a leakage inductor integrated with the transformer. In the present embodiment, the first inductor and the second inductor participate in resonance with the resonant network on the primary side, thereby reducing the switching loss of the switching tube and improving the electromagnetic compatibility (EMC) of the converter.

In some embodiments, the resonant network further comprises: and the third inductor is an independent inductor, or an inductor or a leakage inductor integrated with the transformer, and the third inductor, the resonant capacitor, the first inductor and the second inductor participate in resonance together.

In some embodiments, the direction of energy flow of the transducer is unidirectional, or bidirectional.

Specifically, the converter may operate unidirectionally or bidirectionally, so that the energy flow direction of the converter is unidirectional or bidirectional.

In some embodiments, the preset line does not change with a change in the direction of energy flow. As an example, the switching network, the resonant network, the transformer and the clamping push-pull network are connected in sequence, and whether the working sequence is from the switching network to the clamping push-pull network or from the clamping push-pull network to the switching network, a current path of the clamping push-pull network always includes the first switching tube, the clamping capacitor, the first winding, the second winding, the first inductor and the second inductor, or the second switching tube, the clamping capacitor, the first winding, the second winding, the first inductor and the second inductor.

In some embodiments, when the working sequence is from the switching network to the resonant network and further to the clamping push-pull network, under the condition that the resonant network on the primary side and the first inductor and the second inductor on the secondary side of the transformer resonate together, the switching tubes in the switching network realize Zero Voltage Switching (ZVS), and the first switching tubes and the second switching tubes in the clamping push-pull network realize Zero Current Switching (ZCS). When the working sequence is from the clamping push-pull network to the resonance network and further to the switch network, under the common resonance of the resonance network on the primary side of the transformer and the first inductor and the second inductor on the secondary side of the transformer, the switch tube in the switch network realizes Zero Current Switching (ZCS), and the first switch tube and the second switch tube in the clamping push-pull network realize Zero Voltage Switching (ZVS).

Therefore, the forward working process and the reverse working process in the embodiment of the application can realize the soft switching work of all the switching tubes through the common resonance of the resonance network, the first inductor and the second inductor, and further, the switching loss of the switching tubes is reduced.

In the embodiment of the application, as the clamp push-pull network only has two switching tubes, only two sets of corresponding driving circuits are needed, so that the circuit structure is simplified, and the occupied space and the Printed Circuit Board (PCB) area are reduced.

Fig. 4 and 5 are schematic flow charts of bidirectional currents of a control method of an inverter device, the control method being applied to the inverter device, as shown in fig. 4 and 5, the control method of the inverter device includes:

step S110, when the switch network transmits current to the clamping push-pull network, controlling the switching frequency of the switch network to enable the resonant network, the first inductor and the second inductor to work in a resonant state or a quasi-resonant state, and converting output voltage of the resonant network through a transformer to obtain first voltage;

step S120, when the clamp push-pull network receives a first voltage, controlling a current to run in the clamp push-pull network according to a preset circuit, and finally obtaining a target voltage through filtering and current sharing of a first inductor and a second inductor and switching of a first switch tube and a second switch tube;

or, in step S130, when the clamp push-pull network transmits a current to the switch network, the current is controlled to run in the clamp push-pull network according to a preset circuit, and a first voltage is obtained through switching of the first switch tube and the second switch tube and filtering and current sharing of the first inductor and the second inductor;

step S140, controlling the switching frequency of the clamping push-pull network, converting the switching frequency by a transformer, transmitting a first voltage to a resonant network, enabling the resonant network, a first inductor and a second inductor to work in a resonant state or a quasi-resonant state, and finally rectifying the voltage by the switching network to obtain a target voltage;

the preset circuit comprises a first switch tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor, or a second switch tube, a clamping capacitor, a first winding, a second winding, a first inductor and a second inductor.

The converter is used for converting the electric energy to obtain a target voltage. When the clamping push-pull network receives the first voltage, the alternating current is controlled to circulate in the clamping push-pull network according to a preset circuit, and finally, the target direct current voltage is obtained.

In this step, the preset circuit includes a first switch tube, a clamping capacitor, a first winding, a second winding, a first inductor, and a second inductor, or a second switch tube, a clamping capacitor, a first winding, a second winding, a first inductor, and a second inductor, so that the current only needs to pass through the first switch tube or the second switch tube at each time, and then the target voltage is obtained through the clamping capacitor, the first winding, the second winding, the first inductor, and the second inductor.

In some embodiments, the first switch tube and the second switch tube are passive power switches or active power switches.

In some embodiments, the first inductor and the second inductor are both independent inductors, or integrated inductors, or inductors integrated with the transformer or leakage inductors.

In some embodiments, the resonant network further comprises: and the third inductor is an independent inductor, or an inductor or a leakage inductor integrated with the transformer, and the third inductor, the resonant capacitor, the first inductor and the second inductor participate in resonance together.

In some embodiments, the direction of energy flow of the transducer is unidirectional, or bidirectional.

In some embodiments, the switching network, the resonant network, the transformer and the clamping push-pull network are connected in sequence, and whether the working sequence is from the switching network to the clamping push-pull network or from the clamping push-pull network to the switching network, a current path of the clamping push-pull network always includes the first switching tube, the clamping capacitor, the first winding, the second winding, the first inductor and the second inductor, or the second switching tube, the clamping capacitor, the first winding, the second winding, the first inductor and the second inductor.

The control method of the inverter device provided by the embodiment of the present application has the same technical features as those of the inverter device provided by the above embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.

The control method of the converter device provided by the embodiment of the application can be specific hardware on the equipment or software or firmware installed on the equipment. The method provided by the embodiment of the present application, which has the same implementation principle and the same technical effect as the method embodiment described above, for the sake of brief description, and where no part of the method embodiment is mentioned, reference may be made to the corresponding content in the foregoing device embodiment. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

For another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method for controlling the converter according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the scope of the embodiments of the present application. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.