Parallel current sharing connection circuit
By setting the first and second ends of the component unit in the parallel circuit and connecting them in parallel, the problem of current imbalance is solved, and the current balanced distribution and device protection are realized.
Patent Information
- Application Number
- CN202520001642.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-02
AI Technical Summary
When electronic components are used in parallel, impedance mismatch leads to current imbalance, causing some components to burn out due to overcurrent, a problem that is difficult to solve effectively with existing technology.
A parallel current sharing circuit is adopted, which sets the first and second ends of N component units and connects them in parallel, and ensures that the equivalent impedance of the first end connection line of the m-th component unit is equal to the equivalent impedance of the second end connection line of the (N+1-m)-th component unit, thereby achieving current balance.
It achieves balanced current distribution, avoids overcurrent in components, and has a simple and easy-to-implement circuit connection, without being limited by the placement of components or the aesthetics of the wiring.
Smart Images
Figure CN223680955U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power electronic circuit technical field, specifically, parallel current sharing connection circuit. BACKGROUND
[0002] When electronic components or power modules are used in parallel, uneven current will be generated due to impedance mismatching, especially when passive components are used in parallel, active current sharing technology cannot be effectively used for current sharing between devices, and current sharing of parallel devices is mainly realized by using equal-length wires or by externally adding active current sharing components. Once the current is uneven between devices, it means that some devices flow through large current and some devices flow through small current, resulting in current imbalance, which may cause some devices to overheat, burn out or reduce service life in serious cases. SUMMARY
[0003] To solve the above problems, the purpose of the embodiments of the utility model is to provide a parallel current sharing connection circuit method and device.
[0004] The embodiments of the utility model provide a parallel current sharing connection circuit, which comprises: N identical component units, each component unit comprises a first end and a second end, and the first end of each component unit is connected in parallel in turn, and the second end of each component unit is connected in parallel in turn; the first end of the first component unit is connected with a first parallel total connection end, and the second end of the Nth component unit is connected with a second parallel total connection end; the equivalent impedance of the first end connecting line of the mth component unit is equal to the equivalent impedance of the second end connecting line of the N+1-mth component unit; wherein N is a positive integer greater than 0, and m is a positive integer greater than 0 and less than N.
[0005] Optionally, the wire from the first end of the mth component unit to the first parallel total connection end and the wire from the second end of the N+1-mth component unit to the second parallel total connection end are equal in length.
[0006] Optionally, the effective cross-sectional area of the first end connecting line of the N component units decreases in turn, and the effective cross-sectional area of the second end connecting line of the N component units increases in turn.
[0007] Optionally, the connecting line adopts a unified wire diameter specification, and the N component units are placed at the same distance.
[0008] Optionally, the connection mode is printed circuit board wiring.
[0009] Optionally, the first parallel total connection end is located at the first end of the first component unit and away from the side of the second component unit, the second parallel total connection end is located at the second end of the Nth component unit and away from the side of the (N-1)th component unit, the first block of complete copper skin traces are sequentially connected to the first end of the Nth component unit from the first parallel total connection end, and the second block of complete copper skin traces are sequentially connected to the second end of the first component unit from the second parallel total connection end in the reverse direction.
[0010] Optionally, the trace width of the first block of complete copper skin traces from the first parallel total connection end to the first end of the Nth component unit is sequentially reduced by equal differences, the trace width of the second block of complete copper skin traces from the second parallel total connection end to the second end of the first component unit is sequentially increased by equal differences, and the amplitude of the equal difference reduction is equal to the amplitude of the equal difference increase.
[0011] In the scheme provided in the above embodiment of the utility model, only the equivalent impedance of the first end connection line of the mth component unit in the N parallel component units is required to be equal to the equivalent impedance of the second end connection line of the (N+1-m)th component unit, the uniform current of the parallel circuit can be met, and the situation that some devices flow through large current and some devices flow through small current to cause current imbalance is avoided. In addition, the circuit connection form is simple, is easy to realize in space, is not limited by factors such as the placement position of the device and the aesthetic degree of the trace, and is easy to practice.
[0012] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.
[0014] Figure 1 A current schematic diagram of a plurality of devices in parallel in the prior art is shown;
[0015] Figure 2 A current schematic diagram of another plurality of devices in parallel in the prior art is shown;
[0016] Figure 3 A schematic diagram of a parallel current sharing connection circuit provided by the embodiment of the utility model is shown;
[0017] Figure 4The current path schematic diagram of each component in the parallel current sharing connection circuit is shown;
[0018] Figure 5 The schematic diagram of the embodiment one is shown.
[0019] Figure 6 The schematic diagram of the embodiment two is shown.
[0020] Figure 7 The schematic diagram of another structure of the embodiment two is shown.
[0021] Icon:
[0022] A-first parallel total connection end, B-second parallel total connection end, a-first end, b-second end, P-first block complete copper skin wiring, Q-second block complete copper skin wiring, 1-first parallel connection point, O-second parallel connection point. DETAILED DESCRIPTION
[0023] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as limiting the utility model.
[0024] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.
[0025] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0026] In the prior art, taking a two-port device as an example, multiple devices are connected in parallel, usually the first ends of all devices are connected in parallel, and the second ends of all devices are connected in parallel, as shown in Figure 1 . Figure 1 A current schematic diagram of multiple devices connected in parallel in the prior art is shown. The inventor finds that in this case, if all parallel connection points are connected to one of the devices, i.e. the first parallel connection point I and the second parallel connection point O are both connected to the two ends of one of the devices, the current paths of each device will not be completely consistent, resulting in uneven current flow. In addition, there is another way to connect multiple devices in parallel, as shown in Figure 2 . Figure 2 Another current schematic diagram of multiple devices connected in parallel in the prior art is shown. In this case, a set of connection lines needs to be drawn from the two ends of each device to the same parallel connection point (such as the first parallel connection point I or the second parallel connection point O) on the same side, which requires that the connection lines from the same side connection points of each device to the common parallel connection point be equal in length. In this way, Figure 2 the first parallel connection point I needs to be equal in length to the connection lines to the same side of all devices, and the second parallel connection point O needs to be equal in length to the connection lines to the other side of all devices. The inventor finds that this way is very difficult in space, limited by the placement position of the devices, the appearance of the connection lines, and other factors, and is difficult to practice.
[0027] Based on this, the embodiment of the utility model provides a parallel current sharing connection circuit, which can assume that the cross-sectional area of the line is the same. As shown in Figure 3 , the parallel current sharing connection circuit comprises: N same component units. For example, Figure 3 4 component units are shown in Figure 3 , which are shown by reference numerals 1, 2, 3, 4, and it can be understood that in this embodiment, N = 4. Each component unit comprises a first end and a second end, Figure 3 which are respectively represented by reference numerals a and b. The first end a of each component unit is connected in parallel in turn, and the second end b of each component unit is connected in parallel in turn; the first end a of the first component unit is connected with a first parallel total connection end Figure 3 , which is shown by reference numeral A, and the second end of the Nth component unit is connected with a second parallel total connection end , which is shown by reference numeral B. Further, the equivalent impedance of the first end connection line of the mth component unit is equal to the equivalent impedance of the second end connection line of the N+1-mth component unit; wherein N is a positive integer greater than 0, and m is a positive integer greater than 0 and less than N.
[0028] It can be understood that the first parallel total connection end A is led out from the first end a of the component unit 1, and the connection relationship of the connection line is from the first end of the component unit 1 to the first end a of the component unit 2, from the first end a of the component unit 2 to the first end a of the component unit 3, and from the first end a of the component unit 3 to the first end a of the component unit 4. The second parallel total connection end B is led out from the second end b of the component unit 4, and the connection relationship of the connection line is from the second end b of the component unit 4 to the second end b of the component unit 3, from the second end b of the component unit 3 to the second end b of the component unit 2, and from the second end b of the component unit 2 to the second end b of the component unit 1.
[0029] As shown in Figure 4 Figure 4 The current path schematic diagram of each component under this connection relationship is shown. The current path of the component unit 1 is: A point-component unit 1 first end-component unit 1 body-component unit 1 second end-B point. The current path of the component unit 2 is: A point-component unit 2 first end-component unit 2-component unit 2 second end-B point. The current path of the component unit 3 is: A point-component unit 3 first end-component unit 3-component unit 3 second end-B point. The current path of the component unit 4 is: A point-component unit 4 first end-component unit 4 body-component unit 4 second end-B point.
[0030] From the current path, the current path difference of any two component units is only the path difference between the first ends of the two component units and the path difference between the second ends of the two component units. For example, the current path difference of the component unit 2 and the component unit 4 is the first end of the component unit 2 to the first end of the component unit 4 and the second end of the component unit 2 to the second end of the component unit 4. From the loop, this connection relationship ensures that the impedances are equal, that is, the equivalent impedance of the first end connection line of the mth component unit is equal to the equivalent impedance of the second end connection line of the N+1-mth component unit, and then the parallel loop can realize current sharing.
[0031] The parallel current sharing connection circuit provided by the embodiment of the utility model only requires that the equivalent impedance of the first end connection line of the mth component unit in the N parallel component units is equal to the equivalent impedance of the second end connection line of the N+1-mth component unit, can meet the current sharing of the parallel loop, avoids that some devices flow through large current and some devices flow through small current, and generates the situation of current imbalance. In addition, the circuit connection form is simple, easy to realize in space, not limited by the placement position of the device, the aesthetic degree of the wiring and other factors, and easy to practice.
[0032] Optionally, the length of the wire from the first end of the mth component unit to the first parallel total connection end and the length of the wire from the second end of the N+1-mth component unit to the second parallel total connection end are equal. It can be determined that, in the case that the equivalent impedance of the first end connection line of the mth component unit is equal to the equivalent impedance of the second end connection line of the N+1-mth component unit, the equal length of the current loop path of the parallel component units means that the cross-sectional area of the line is the same. The effective cross-sectional area of the first end connection line of the first component unit is equal to the effective cross-sectional area of the second end of the Nth component, the effective cross-sectional area of the first end connection line of the second component is equal to the effective cross-sectional area of the second end of the N-1th component, and so on. That is, the effective cross-sectional area of the first end connection line of the mth component unit is equal to the effective cross-sectional area of the second end connection line of the N+1-mth component unit. Optionally, the effective cross-sectional area of the first end connection line of the N component units decreases in turn, and the effective cross-sectional area of the second end connection line of the N component units increases in turn.
[0033] Compared with the requirement that all wires to the connection points of the parallel device are equal in length and the equivalent resistance is equal, the embodiment of the utility model only requires that, in the N parallel component units, the length of the wire from the first end of the mth component unit to the first parallel total connection end and the length of the wire from the second end of the N+1-mth component unit to the second parallel total connection end are equal. The former requires that 2N connection lines are equal in length, while the latter only requires that N groups of 2 equal-length wires are equal in length. Obviously, with the increase of the number of parallel devices, the requirement for equal-length lines of the latter is greatly reduced.
[0034] As shown in Figure 5 , a specific example provided by the embodiment of the utility model is shown, that is, embodiment one: Figure 5
[0035] The embodiment one adopts the same specification cable connection mode to connect multiple components in parallel. As shown in Figure 5 , a first parallel total connection end A and a second parallel total connection end B. From the connection relationship, the first parallel total connection end A is closest to the component unit 1, and then is connected to the component unit 2, the component unit 3... and the component unit N in turn. The second parallel total connection end B is closest to the component unit N, and then is connected to the component unit N-1, the component unit N-2... and the component unit 1 in turn. And the length of the cable meets the following requirements: the length of the first end connection line of the mth component unit is equal to the length of the second end connection line of the N+1-mth component unit.
[0036] Since the cable adopted is of the same specification, that is, the effective cross-sectional area of the cable is equal. In this embodiment, there are 8 wires in total, which are divided into 4 groups, and each group has 2 wires. The 4 groups are not required to be equal in length, and the two in each group are required to be equal in length. In this way, the current loop impedance from A to B through any component unit is equal, and parallel loop current sharing can be achieved.
[0037] Optionally, the connecting wires use a uniform wire diameter specification, and the connecting wires are insulated conductors. The N component units are placed at the same spacing and the wiring is of equal length.
[0038] Alternatively, a printed circuit board (PCB) trace connection method can be used.
[0039] Optionally, such as Figure 6 As shown, Figure 6 This illustrates another specific example provided by the present invention, namely Embodiment Two. This embodiment employs a PCB trace connection method. The first parallel connection terminal A is located at the first end a of the first component unit and on the side away from the second component unit; the second parallel connection terminal B is located at the second end b of the Nth component unit and on the side away from the (N-1)th component unit. The first complete copper trace ( Figure 6 (Indicated by reference numeral P in the attached diagram) From the first parallel main connection terminal A, it sequentially connects to the first terminal a of the Nth component unit, and the second complete copper trace ( Figure 6 (As shown by reference numeral Q in the attached figure) It is connected from the second parallel connection end B in the opposite direction to the second end b of the first component unit.
[0040] Optionally, such as Figure 7 As shown, the first complete copper trace ( Figure 7 (Indicated by reference numeral P in the attached diagram) The trace width from the first parallel connection terminal A to the first terminal a of the Nth component unit decreases progressively at equal arithmetic intervals; the second complete copper trace ( Figure 7 (As shown by reference numeral Q in the attached diagram) The trace width from the second parallel connection terminal B to the second terminal b of the first component unit increases sequentially at equal arithmetic intervals, and the magnitude of the decrease is equal to the magnitude of the increase. Because Figure 7 From left to right, the current in the common loop decreases sequentially. When it reaches the last component unit, the current in the connecting loop is only the current of the last component unit. Therefore, the width of the trace can be reduced in an arithmetic manner, thereby reducing the area of the copper foil on the PCB.
[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A parallel current sharing connection circuit, characterized by, include: N identical component units, each component unit including a first end and a second end, wherein the first ends of each component unit are connected in parallel sequentially, and the second ends of each component unit are connected in parallel sequentially; the first end of the first component unit is connected to a first parallel total connection terminal, and the second end of the Nth component unit is connected to a second parallel total connection terminal; the equivalent impedance of the first end connection line of the mth component unit is equal to the equivalent impedance of the second end connection line of the (N+1-m)th component unit; where N is a positive integer greater than 0, and m is a positive integer greater than 0 and less than N.
2. The current sharing connection circuit of claim 1, wherein, The trace from the first end of the m-th component unit to the first parallel connection terminal and the trace from the second end of the N+1-m-th component unit to the second parallel connection terminal are of the same length.
3. The current sharing connection circuit of claim 1, wherein, The effective cross-sectional area of the first end connection lines of the N component units decreases sequentially, and the effective cross-sectional area of the second end connection lines of the N component units increases sequentially.
4. The current sharing connection circuit of claim 1, wherein, The connecting lines use a uniform wire diameter, and the N component units are placed at the same spacing.
5. The current sharing connection circuit of claim 1, wherein, The connection method uses printed circuit board traces.
6. The current sharing connection circuit of claim 5, wherein, The first parallel connection terminal is located at the first end of the first component unit and on the side away from the second component unit; the second parallel connection terminal is located at the second end of the Nth component unit and on the side away from the (N-1)th component unit; the first complete copper trace passes through the first parallel connection terminal sequentially and connects to the first end of the Nth component unit, and the second complete copper trace passes through the second parallel connection terminal sequentially and connects to the second end of the first component unit in the opposite direction.
7. The current sharing connection circuit of claim 6, wherein, The width of the first complete copper trace decreases sequentially at equal arithmetic steps from the first parallel connection terminal to the first end of the Nth component unit; the width of the second complete copper trace increases sequentially at equal arithmetic steps from the second parallel connection terminal to the second end of the first component unit, and the magnitude of the decrease is equal to the magnitude of the increase.