Wide-range output conversion circuit

Abstract

The utility model discloses a wide-range output conversion circuit, which comprises a first input end, a second input end, a third input end, a fourth input end, a first output end, a second output end, a third output end, a fourth output end, a switching unit, a first switch unit and a second switch unit, the first input end and the second input end are used for being connected with a first external unit, and the third input end and the fourth input end are used for being connected with a second external unit; the switching unit is connected with the first end and the second end of the third external unit, and the switching unit is connected with the first output end, the second output end, the third output end, the fourth output end, the second input end and the third input end, so that switching of different states is achieved. Compared with the conventional application in the market, the wide-range output conversion circuit can enlarge the output range of current and voltage, realizes multiple purposes, and is low in cost, good in stability, convenient to operate and easy to realize.

Description

Technical Field

[0001] This utility model belongs to the field of battery formation test control technology, specifically relating to a wide-range output conversion circuit. Background Technology

[0002] In battery testing equipment, the voltage range of different types of battery packs varies greatly, from 48V two-wheeled vehicle battery packs to 600V power battery packs and 1200V energy storage battery packs. Battery manufacturers and testing centers need to use test power supplies with different voltage and current specifications to test battery packs of different voltage levels. These devices with different voltage and current specifications are not interchangeable. For example, devices with low voltage specifications cannot output high voltage and therefore cannot test high-voltage battery packs, while devices with high voltage specifications cannot discharge the battery pack to a very low voltage and their sampling voltage accuracy cannot meet the testing requirements of low-voltage battery packs.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a wide-range output conversion circuit that can switch between three states simultaneously, making it more flexible to use and better able to meet the needs of various application processes.

[0005] To achieve the above objectives, a specific embodiment of this utility model provides the following technical solution: a wide-range output conversion circuit, characterized in that it includes: a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, a switching unit, a first switch unit, and a second switch unit, wherein the first input terminal and the second input terminal are used to connect to a first external unit, and the third input terminal and the fourth input terminal are used to connect to a second external unit;

[0006] The switching unit is connected to the first and second ends of the third external unit, and the switching unit is also connected to the first output end, the second output end, the third output end, the fourth output end, the second input end, and the third input end to achieve switching between different states; the first switch unit is connected to the first input end, the second input end, the first output end, and the second output end; the second switch unit is connected to the third input end, the fourth input end, the third output end, and the fourth output end.

[0007] In the first state, the switching unit is used to control the first output terminal to be connected to the first terminal of the third external unit, the second output terminal to be connected to the second terminal of the third external unit, the third output terminal to be connected to the first terminal of the third external unit, and the fourth output terminal to be connected to the second terminal of the third external unit; in the second state, the switching unit is used to control the first output terminal to be connected to the first terminal of the third external unit, the second output terminal to be connected to the fourth output terminal, and the third output terminal to be connected to the second terminal of the third external unit; in the third state, the switching unit is used to control the first output terminal to be connected to the first terminal of the third external unit, the second input terminal to be connected to the third input terminal, and the third output terminal to be connected to the second terminal of the third external unit.

[0008] In the first state, the first switching unit is used to control the first input terminal to be connected to the first output terminal, and / or the second switching unit is used to control the third input terminal to be connected to the third output terminal; or, the first switching unit is used to control the first output terminal to be connected to the second output terminal and / or the second switching unit is used to control the third output terminal to be connected to the fourth output terminal.

[0009] In the second or third state, the first switch unit is used to control the first input terminal to be connected to the first output terminal, and the second switch unit is used to control the third input terminal to be connected to the third output terminal or the second switch unit is used to control the fourth input terminal to be connected to the third output terminal; or, the first switch unit is used to control the second input terminal to be connected to the first output terminal, and the second switch unit is used to control the third input terminal to be connected to the third output terminal or the second switch unit is used to control the fourth input terminal to be connected to the third output terminal.

[0010] In one or more embodiments of the present invention, the conversion circuit further includes a first filtering unit and a second filtering unit, wherein the first filtering unit is connected between the first switching unit, the first output terminal and the second output terminal, and the second filtering unit is connected between the second switching unit, the second output terminal and the third output terminal.

[0011] In one or more embodiments of the present invention, the first switching unit includes a first transistor and a second transistor. The second terminal of the first transistor is connected to the first input terminal. The first terminal of the first transistor is connected to the first filter unit and the second terminal of the second transistor. The first terminal of the second transistor is connected to the second input terminal, the second output terminal and the first filter unit. The control terminal of the first transistor and the control terminal of the second transistor respectively receive corresponding control signals.

[0012] In one or more embodiments of the present invention, the second switching unit includes a third transistor and a fourth transistor. The second terminal of the third transistor is connected to the third input terminal, the first terminal of the third transistor is connected to the second filter unit and the second terminal of the fourth transistor, the first terminal of the fourth transistor is connected to the fourth input terminal and the fourth output terminal, and the control terminals of the third transistor and the fourth transistor respectively receive corresponding control signals.

[0013] In one or more embodiments of the present invention, the first filtering unit includes a first inductor and a first capacitor. The first end of the first inductor is connected to the first switching unit, the second end of the first inductor is connected to the first end of the first capacitor and the first output terminal, and the second end of the first capacitor is connected to the second output terminal.

[0014] In one or more embodiments of the present invention, the second filter unit includes a second inductor and a second capacitor. The first end of the second inductor is connected to the second switching unit, the second end of the second inductor is connected to the third output terminal and the first end of the second capacitor, and the second end of the second capacitor is connected to the second output terminal.

[0015] In one or more embodiments of this utility model, the switching unit includes a first switch, a second switch, a third switch, and a fourth switch. The first end of the first switch is connected to a first output terminal, the second end of the first switch is connected to a first end of a third external unit, the first end of the second switch is connected to a second output terminal, the second end of the second switch is connected to a second end of the third external unit, the first end of the third switch is connected to a third output terminal, the second end of the third switch is connected to a first end of the third external unit, the first end of the fourth switch is connected to a fourth output terminal, and the second end of the fourth switch is connected to both the second output terminal and the first end of the second switch. In a first state, the first switch, the second switch, the third switch, and the fourth switch are all closed.

[0016] In one or more embodiments of this utility model, the switching unit includes a first switch, a fourth switch, and a fifth switch. The first end of the first switch is connected to a first output terminal, the second end of the first switch is connected to a first end of a third external unit, the first end of the fourth switch is connected to a fourth output terminal, the second end of the fourth switch is connected to a second output terminal, the first end of the fifth switch is connected to a second end of the third external unit, and the second end of the fifth switch is connected to a third output terminal. In a second state, the first switch, the fourth switch, and the fifth switch are all closed.

[0017] In one or more embodiments of this utility model, the switching unit includes a first switch, a fifth switch, and a sixth switch. The first end of the first switch is connected to a first output terminal, the second end of the first switch is connected to a first end of a third external unit, the first end of the fifth switch is connected to a second end of the third external unit, the second end of the fifth switch is connected to a third output terminal, the first end of the sixth switch is connected to a second input terminal, and the second end of the sixth switch is connected to a third input terminal. In a third state, the first switch, the fifth switch, and the sixth switch are all closed.

[0018] In one or more embodiments of this utility model, the conversion circuit further includes a first filter capacitor and / or a second filter capacitor, wherein a first end of the first filter capacitor is connected to a first input terminal, a second end of the first filter capacitor is connected to a second input terminal, a first end of the second filter capacitor is connected to a third input terminal, and a second end of the second filter capacitor is connected to a fourth input terminal.

[0019] Compared with existing technologies, the wide-range output conversion circuit of this utility model can increase the output range of current and voltage compared with conventional applications on the market, realize multiple functions in one machine, and has low cost, good stability, convenient operation and easy implementation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a circuit diagram of a wide-range output conversion circuit in one embodiment of the present invention.

[0022] Figure 2 This is an equivalent circuit diagram of the wide-range output conversion circuit in the first state according to an embodiment of the present invention.

[0023] Figure 3 This is an equivalent circuit diagram of the wide-range output conversion circuit in the second state in one embodiment of the present invention.

[0024] Figure 4 This is an equivalent circuit diagram of the wide-range output conversion circuit in the third state according to one embodiment of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0026] The terms "coupled," "connected," or "linked" in the specification include both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as an electrical conduction medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in the invention, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0027] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0028] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0029] For the purposes of this disclosure, the phrase “A and / or B” means (A), (B), or (A and B). For the purposes of this disclosure, the phrase “A, B and / or C” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0030] Various components and devices may be referred to or shown in the singular (e.g., “MOS transistor”, “transistor”, “switch”, etc.) in this document, but only for the convenience of discussion, and any element referred to in the singular may include multiple such elements as taught herein.

[0031] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which may refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used with respect to embodiments of this disclosure are synonymous.

[0032] like Figure 1 As shown, a wide-range output conversion circuit according to one embodiment of the present invention includes: a first input terminal A1, a second input terminal A2, a third input terminal B1, a fourth input terminal B2, a first output terminal D1, a second output terminal D2, a third output terminal E1, a fourth output terminal E2, a switching unit, a first switching unit 10, a second switching unit 20, a first filtering unit 30, a second filtering unit 40, a first filtering capacitor Cbus1, and a second filtering capacitor Cbus2.

[0033] The first input terminal A1 and the second input terminal A2 are used to connect to the first external unit, and the third input terminal B1 and the fourth input terminal B2 are used to connect to the second external unit. In one embodiment, the first external unit and the second external unit can be a power supply or an AC-DC converter, or various loads.

[0034] The first terminal of the first filter capacitor Cbus1 is connected to the first input terminal A1, and the second terminal of the first filter capacitor Cbus1 is connected to the second input terminal A2. The first terminal of the second filter capacitor Cbus2 is connected to the third input terminal B1, and the second terminal of the second filter capacitor Cbus2 is connected to the fourth input terminal B2. The first switching unit 10 is connected to the first input terminal A1, the second input terminal A2, the first output terminal D1, and the second output terminal D2. The second switching unit 20 is connected to the third input terminal B1, the fourth input terminal B2, the third output terminal E1, and the fourth output terminal E2. The first filter unit 30 is connected between the first switching unit 10, the first output terminal D1, and the second output terminal D2. The second filter unit 40 is connected between the second switching unit 20, the second output terminal D2, and the third output terminal E1.

[0035] The switching unit is connected to the first terminal X and the second terminal Y of the third external unit. In one embodiment, the third external unit can be a battery pack or various loads. The switching unit is also connected to the first output terminal D1, the second output terminal D2, the third output terminal E1, the fourth output terminal E2, the second input terminal A2, and the third input terminal B1 to achieve switching between different states. In one embodiment, switching is mainly performed in three states.

[0036] In the first state, the switching unit controls the first output terminal D1 to be connected to the first terminal X of the third external unit, the second output terminal D2 to be connected to the second terminal Y of the third external unit, the third output terminal E1 to be connected to the first terminal X of the third external unit, and the fourth output terminal E2 to be connected to the second terminal Y of the third external unit; in the second state, the switching unit controls the first output terminal D1 to be connected to the first terminal X of the third external unit, the second output terminal D2 to be connected to the fourth output terminal E2, and the third output terminal E1 to be connected to the second terminal Y of the third external unit; in the third state, the switching unit controls the first output terminal D1 to be connected to the first terminal X of the third external unit, the second input terminal A2 to be connected to the third input terminal B1, and the third output terminal E1 to be connected to the second terminal Y of the third external unit.

[0037] In the first state, the first switch unit 10 is used to control the first input terminal A1 to be connected to the first output terminal D1, and the second switch unit 20 is used to control the third input terminal B1 to be connected to the third output terminal E1, or the first switch unit 10 is used to control the first output terminal D1 to be connected to the second output terminal D2, and the second switch unit 20 is used to control the third output terminal E1 to be connected to the fourth output terminal E2; in the second or third state, the first switch unit 10 is used to control the first input terminal A1 to be connected to the first output terminal D1, and the second switch unit 20 is used to control the third input terminal B1 to be connected to the third output terminal E1, or the first switch unit 10 is used to control the second input terminal A2 to be connected to the first output terminal D1, and the second switch unit 20 is used to control the fourth input terminal B2 to be connected to the third output terminal E1.

[0038] like Figure 1 As shown, the first switching unit 10 includes a first transistor Q1 and a second transistor Q2. The second terminal of the first transistor Q1 is connected to the first input terminal A1. The first terminal of the first transistor Q1 is connected to the first filter unit 30 and the second terminal of the second transistor Q2. The first terminal of the second transistor Q2 is connected to the second input terminal A2, the second output terminal D2 and the first filter unit 30. The control terminals of the first transistor Q1 and the second transistor Q2 respectively receive corresponding control signals.

[0039] like Figure 1 As shown, the second switching unit 20 includes a third transistor Q3 and a fourth transistor Q4. The second terminal of the third transistor Q3 is connected to the third input terminal B1. The first terminal of the third transistor Q3 is connected to the second filter unit 40 and the second terminal of the fourth transistor Q4. The first terminal of the fourth transistor Q4 is connected to the fourth input terminal B2 and the fourth output terminal E2. The control terminals of the third transistor Q3 and the fourth transistor Q4 respectively receive corresponding control signals.

[0040] In one embodiment, the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are all insulated-gate bipolar transistors (IGBTs). The first terminals of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are emitters; the second terminals of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are collectors; and the control terminals of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are gates. In other embodiments, the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 can be N-channel Si-MOSFETs or SiC-MOSFETs.

[0041] like Figure 1 As shown, the first filter unit 30 includes a first inductor L1 and a first capacitor C1. The first end of the first inductor L1 is connected to the first switch unit 10, the second end of the first inductor L1 is connected to the first end of the first capacitor C1 and the first output terminal D1, and the second end of the first capacitor C1 is connected to the second output terminal D2.

[0042] like Figure 1 As shown, the second filter unit 40 includes a second inductor L2 and a second capacitor C2. The first end of the second inductor L2 is connected to the second switch unit 20, the second end of the second inductor L2 is connected to the third output terminal E1 and the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected to the second output terminal D2.

[0043] like Figure 1 As shown, the switching unit includes a first switch KM1, a second switch KM2, a third switch KM3, a fourth switch KM4, a fifth switch KM5, and a sixth switch KM6.

[0044] The first terminal of the first switch KM1 is connected to the first output terminal D1, and the second terminal of the first switch KM1 is connected to the first terminal X of the third external unit. The first terminal of the second switch KM2 is connected to the second output terminal D2, and the second terminal of the second switch KM2 is connected to the second terminal Y of the third external unit. The first terminal of the third switch KM3 is connected to the third output terminal E1, and the second terminal of the third switch KM3 is connected to the first terminal X of the third external unit. The first terminal of the fourth switch KM4 is connected to the fourth output terminal E2, and the second terminal of the fourth switch KM4 is connected to both the second output terminal D2 and the first terminal of the second switch KM2. The first terminal of the fifth switch KM5 is connected to the second terminal Y of the third external unit, and the second terminal of the fifth switch KM5 is connected to the third output terminal E1. The first terminal of the sixth switch KM6 is connected to the second input terminal A2, and the second terminal of the sixth switch KM6 is connected to the third input terminal B1.

[0045] like Figure 2 Combination Figure 1 As shown, in the first state, only the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are closed, which is equivalent to forming two circuits connected in parallel. At this time, the first transistor Q1 and the second transistor Q2 are complementaryly turned on under the control of their respective control signals, and the third transistor Q3 and the fourth transistor Q4 are complementaryly turned on under the control of their respective control signals.

[0046] In one embodiment, the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 can each be turned on individually. Of course, the first transistor Q1 and the third transistor Q3 can also be turned on simultaneously, or the second transistor Q2 and the fourth transistor Q4 can also be turned on simultaneously. Generally, the first transistor Q1 and the third transistor Q3 have the same on-time, and the second transistor Q2 and the fourth transistor Q4 have the same on-time. Preferably, the phases of the two control signals controlling the conduction of the first transistor Q1 and the third transistor Q3 can be staggered by 180°, and the phases of the two control signals controlling the conduction of the second transistor Q2 and the fourth transistor Q4 can be staggered by 180°, thereby reducing the output current ripple.

[0047] Assuming that under the input voltage of the first external unit and the second external unit, and under the switching control of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4, the rated current / voltage outputs at the first output terminal D1 and the second output terminal D2, and the rated current / voltage outputs at the third output terminal E1 and the fourth output terminal E2 are all (30V~750V) / (-100A~100A), then after connecting the first external unit and the second external unit in parallel, the duty cycle of the control signals controlling the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 is controlled according to the closed-loop control of their respective output currents, which sets half of the total current. The maximum output voltage and current range between the first terminal X and the second terminal Y is (30V~750V) / (-200A~200A).

[0048] like Figure 3 Combination Figure 1 As shown, in the second state, only the first switch KM1, the fourth switch KM4, and the fifth switch KM5 are closed, which is equivalent to forming two circuits capable of bidirectional voltage output. The first transistor Q1 and the second transistor Q2 are complementaryly turned on under the control of their respective control signals, and the third transistor Q3 and the fourth transistor Q4 are complementaryly turned on under the control of their respective control signals.

[0049] In one embodiment, one scenario is that the first transistor Q1 and the third transistor Q3 can be turned on simultaneously, or the first transistor Q1 and the fourth transistor Q4 can be turned on simultaneously; another scenario is that the second transistor Q2 and the third transistor Q3 can be turned on simultaneously, or the second transistor Q2 and the fourth transistor Q4 can be turned on simultaneously. Preferably, the phases of the two control signals controlling the turn-on of the first transistor Q1 and the fourth transistor Q4 can be staggered by 180°, and the phases of the two control signals controlling the turn-on of the second transistor Q2 and the third transistor Q3 can be staggered by 180°, so as to reduce the output current ripple, and the turn-on times of the first transistor Q1 and the fourth transistor Q4 are the same, and the turn-on times of the second transistor Q2 and the third transistor Q3 are the same.

[0050] Assuming that under the input voltage of the first external unit and the second external unit, and under the switching control of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4, the rated current / voltage output at the first output terminal D1 and the second output terminal D2, and the rated current / voltage output at the third output terminal E1 and the fourth output terminal E2 are all (30V~750V) / (-100A~100A), then through the switching of the first transistor Q1 and the second transistor Q2, the third transistor Q3, and the fourth transistor Q4, the maximum output voltage and current range between the first terminal X and the second terminal Y is (-750V~750V) / (-100A~100A).

[0051] like Figure 4 Combination Figure 1 As shown, in the third state, only the first switch KM1, the fifth switch KM5, and the sixth switch KM6 are closed, which is equivalent to forming two circuits connected in series. The first transistor Q1 and the second transistor Q2 are complementaryly turned on under the control of their respective control signals, and the third transistor Q3 and the fourth transistor Q4 are complementaryly turned on under the control of their respective control signals.

[0052] In one embodiment, one scenario is that the first transistor Q1 and the third transistor Q3 can be turned on simultaneously, or the first transistor Q1 and the fourth transistor Q4 can be turned on simultaneously; another scenario is that the second transistor Q2 and the third transistor Q3 can be turned on simultaneously, or the second transistor Q2 and the fourth transistor Q4 can be turned on simultaneously. Preferably, the phases of the two control signals controlling the turn-on of the first transistor Q1 and the fourth transistor Q4 can be staggered by 180°, and the phases of the two control signals controlling the turn-on of the second transistor Q2 and the third transistor Q3 can be staggered by 180°, so as to reduce the output current ripple, and the turn-on times of the first transistor Q1 and the fourth transistor Q4 are the same, and the turn-on times of the second transistor Q2 and the third transistor Q3 are the same.

[0053] Assuming that under the input voltage of the first external unit and the second external unit, and under the switching control of the first transistor Q1 and the second transistor Q2, the third transistor Q3 and the fourth transistor Q4, the rated current / voltage output at the first output terminal D1 and the second output terminal D2, as well as the rated current / voltage output at the third output terminal E1 and the fourth output terminal E2, are all (30V~750V) / (-100A~100A), and the voltage on the first capacitor C1 is the same as the voltage on the second capacitor C2, then after connecting the first external unit and the second external unit in series, by controlling the switching of the first transistor Q1 and the second transistor Q2, the third transistor Q3 and the fourth transistor Q4, the maximum output voltage and current range between the first terminal X and the second terminal Y is (60V~1500V) / (-100A~100A).

[0054] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wide-range output conversion circuit, characterized in that, include: The system includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, a switching unit, a first switch unit, and a second switch unit. The first and second input terminals are used to connect to a first external unit, and the third and fourth input terminals are used to connect to a second external unit. The switching unit is connected to the first and second ends of the third external unit, and the switching unit is connected to the first output end, the second output end, the third output end, the fourth output end, the second input end, and the third input end to realize the switching of different states; The first switching unit is connected to the first input terminal, the second input terminal, the first output terminal, and the second output terminal; the second switching unit is connected to the third input terminal, the fourth input terminal, the third output terminal, and the fourth output terminal. In the first state, the switching unit is used to control the first output terminal to be connected to the first terminal of the third external unit, the second output terminal to be connected to the second terminal of the third external unit, the third output terminal to be connected to the first terminal of the third external unit, and the fourth output terminal to be connected to the second terminal of the third external unit; in the second state, the switching unit is used to control the first output terminal to be connected to the first terminal of the third external unit, the second output terminal to be connected to the fourth output terminal, and the third output terminal to be connected to the second terminal of the third external unit; in the third state, the switching unit is used to control the first output terminal to be connected to the first terminal of the third external unit, the second input terminal to be connected to the third input terminal, and the third output terminal to be connected to the second terminal of the third external unit. In the first state, the first switching unit is used to control the first input terminal to be connected to the first output terminal, and / or the second switching unit is used to control the third input terminal to be connected to the third output terminal; or, the first switching unit is used to control the first output terminal to be connected to the second output terminal and / or the second switching unit is used to control the third output terminal to be connected to the fourth output terminal. In the second or third state, the first switch unit is used to control the first input terminal to be connected to the first output terminal, and the second switch unit is used to control the third input terminal to be connected to the third output terminal or the second switch unit is used to control the fourth input terminal to be connected to the third output terminal; or, the first switch unit is used to control the second input terminal to be connected to the first output terminal, and the second switch unit is used to control the third input terminal to be connected to the third output terminal or the second switch unit is used to control the fourth input terminal to be connected to the third output terminal.

2. The wide-range output conversion circuit according to claim 1, characterized in that, The conversion circuit further includes a first filtering unit and a second filtering unit. The first filtering unit is connected between the first switching unit, the first output terminal, and the second output terminal, and the second filtering unit is connected between the second switching unit, the second output terminal, and the third output terminal.

3. The wide-range output conversion circuit according to claim 2, characterized in that, The first switching unit includes a first transistor and a second transistor. The second terminal of the first transistor is connected to the first input terminal. The first terminal of the first transistor is connected to the first filter unit and the second terminal of the second transistor. The first terminal of the second transistor is connected to the second input terminal, the second output terminal and the first filter unit. The control terminals of the first transistor and the second transistor respectively receive corresponding control signals.

4. The wide-range output conversion circuit according to claim 2, characterized in that, The second switching unit includes a third transistor and a fourth transistor. The second terminal of the third transistor is connected to the third input terminal. The first terminal of the third transistor is connected to the second filter unit and the second terminal of the fourth transistor. The first terminal of the fourth transistor is connected to the fourth input terminal and the fourth output terminal. The control terminals of the third transistor and the fourth transistor respectively receive corresponding control signals.

5. The wide-range output conversion circuit according to claim 2, characterized in that, The first filter unit includes a first inductor and a first capacitor. The first end of the first inductor is connected to the first switching unit, the second end of the first inductor is connected to the first end of the first capacitor and the first output terminal, and the second end of the first capacitor is connected to the second output terminal.

6. The wide-range output conversion circuit according to claim 2, characterized in that, The second filter unit includes a second inductor and a second capacitor. The first end of the second inductor is connected to the second switching unit, the second end of the second inductor is connected to the third output terminal and the first end of the second capacitor, and the second end of the second capacitor is connected to the second output terminal.

7. The wide-range output conversion circuit according to claim 1, characterized in that, The switching unit includes a first switch, a second switch, a third switch, and a fourth switch. The first end of the first switch is connected to a first output terminal, the second end of the first switch is connected to a first end of a third external unit, the first end of the second switch is connected to a second output terminal, the second end of the second switch is connected to a second end of the third external unit, the first end of the third switch is connected to a third output terminal, the second end of the third switch is connected to a first end of the third external unit, the first end of the fourth switch is connected to a fourth output terminal, and the second end of the fourth switch is connected to both the second output terminal and the first end of the second switch. In a first state, the first, second, third, and fourth switches are all closed.

8. The wide-range output conversion circuit according to claim 1, characterized in that, The switching unit includes a first switch, a fourth switch, and a fifth switch. The first end of the first switch is connected to the first output terminal, and the second end of the first switch is connected to the first end of the third external unit. The first end of the fourth switch is connected to the fourth output terminal, and the second end of the fourth switch is connected to the second output terminal. The first end of the fifth switch is connected to the second end of the third external unit, and the second end of the fifth switch is connected to the third output terminal. In the second state, the first switch, the fourth switch, and the fifth switch are all closed.

9. The wide-range output conversion circuit according to claim 1, characterized in that, The switching unit includes a first switch, a fifth switch, and a sixth switch. The first end of the first switch is connected to the first output terminal, the second end of the first switch is connected to the first end of the third external unit, the first end of the fifth switch is connected to the second end of the third external unit, the second end of the fifth switch is connected to the third output terminal, the first end of the sixth switch is connected to the second input terminal, and the second end of the sixth switch is connected to the third input terminal. In the third state, the first switch, the fifth switch, and the sixth switch are all closed.

10. The wide-range output conversion circuit according to claim 1, characterized in that, The conversion circuit further includes a first filter capacitor and / or a second filter capacitor. The first end of the first filter capacitor is connected to the first input terminal, the second end of the first filter capacitor is connected to the second input terminal, the first end of the second filter capacitor is connected to the third input terminal, and the second end of the second filter capacitor is connected to the fourth input terminal.

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