Parallel thyristor circuit and rectifier

Abstract

According to the parallel thyristor circuit and the rectifier, the branch current of the first thyristor and the branch current of the second thyristor are obtained through the adjustment input end of the regulator, the first refrigeration semiconductor and the second refrigeration semiconductor are adjusted and controlled based on the respective branch currents of the first thyristor and the second thyristor through the adjustment output end of the regulator connected to the first refrigeration semiconductor and the second refrigeration semiconductor, and then the thermal resistance of the first thyristor and the second thyristor is adjusted, so that the temperature imbalance of the first thyristor and the second thyristor is reduced, and then the balance of the branch currents of the first thyristor and the second thyristor is realized.

Description

Technical Field

[0001] This utility model relates to the field of circuit control, and more specifically, to a parallel thyristor circuit and a rectifier. Background Technology

[0002] A thyristor is a semiconductor power device, also known as a silicon controlled rectifier (SCR), which is a four-layer, three-terminal semiconductor device. Its core structure consists of four layers of semiconductor material (PNPN) stacked together to form three PN junctions, with three electrodes: anode, cathode, and gate. In circuits, thyristors primarily perform functions such as power on / off control, voltage / current regulation, and energy conversion.

[0003] In a circuit with parallel thyristors, when the conduction current is unbalanced, only thyristors with higher power (current) can be selected to compensate for the current imbalance. However, thyristors with higher current draw result in greater losses and higher temperature rise, thus exacerbating the current imbalance. This is due to the negative temperature characteristic of thyristors. Utility Model Content

[0004] In view of this, the present invention proposes a parallel thyristor circuit and rectifier to solve the above-mentioned technical problems.

[0005] A parallel thyristor circuit according to an embodiment of the present invention includes a first thyristor and a second thyristor connected in parallel, and also includes a first heat pipe and a second heat pipe, a first cooling semiconductor and a second cooling semiconductor. The first heat pipe includes a first end and a second end opposite to each other, and the second heat pipe includes a first end and a second end opposite to each other. The first thyristor is connected to the first end of the first heat pipe, the second end of the first heat pipe is connected to the first cooling semiconductor, the second thyristor is connected to the first end of the second heat pipe, and the second end of the second heat pipe is connected to the second cooling semiconductor. The parallel thyristor circuit also includes a regulator. The regulator's adjustment input is adapted to acquire the branch current of the first thyristor and the branch current of the second thyristor. The regulator's adjustment output is connected to the first cooling semiconductor and the second cooling semiconductor respectively and is configured to adjust and control the first cooling semiconductor and the second cooling semiconductor based on the branch current of the first thyristor and the branch current of the second thyristor.

[0006] Furthermore, the regulator is a PI regulator.

[0007] Furthermore, the regulator adjusts at least one of the cooling power of the first refrigeration semiconductor and the cooling power of the second refrigeration semiconductor based on the branch current of the first thyristor and the branch current of the second thyristor.

[0008] Furthermore, it also includes a current detection circuit, which includes a first input terminal and a second input terminal, as well as a first output terminal and a second output terminal. The first input terminal is connected to the first thyristor, the second input terminal is connected to the second thyristor, and the first output terminal and the second output terminal are respectively connected to the adjustment input terminal of the regulator. The current detection circuit is adapted to detect the branch current of the first thyristor and the branch current of the second thyristor and output the detection result to the regulator.

[0009] Furthermore, the parallel thyristor circuit is also connected to a heat sink, and the top of the heat sink has a first groove suitable for placing the first heat pipe, a second groove suitable for placing the second heat pipe, a third groove suitable for placing the first cooling semiconductor, and a fourth groove suitable for placing the second cooling semiconductor.

[0010] Furthermore, the first tank and the third tank are connected, and the second tank and the fourth tank are connected; and the first thyristor is installed above the first tank, and the second thyristor is installed above the second tank.

[0011] Furthermore, the heat sink is an aluminum heat sink.

[0012] According to another aspect of the present invention, a rectifier is provided, wherein the rectifier is provided with the parallel thyristor circuit described above.

[0013] Furthermore, this includes two or more sets of parallel thyristor circuits.

[0014] As can be seen, the parallel thyristor circuit according to the embodiment of this utility model includes a first thyristor and a second thyristor connected in parallel, a first heat pipe and a second heat pipe, a first cooling semiconductor and a second cooling semiconductor, and a regulator. The first thyristor is connected to the first heat pipe, and the other end of the first heat pipe is connected to the first cooling semiconductor. The second thyristor is connected to the second heat pipe, and the other end of the second heat pipe is connected to the second cooling semiconductor. The regulator's adjustment input terminal is adapted to obtain the branch current of the first thyristor and the branch current of the second thyristor. The regulator's adjustment output terminal is connected to the first cooling semiconductor and the second cooling semiconductor respectively and is configured to adjust and control the first cooling semiconductor and the second cooling semiconductor based on their respective branch currents, thereby adjusting the thermal resistance of the first thyristor and the second thyristor, thereby reducing the temperature imbalance between the first thyristor and the second thyristor, and thus achieving a balance of the branch currents of the first thyristor and the second thyristor. Attached Figure Description

[0015] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention, in which:

[0016] Figure 1 A diagram showing the voltage drop-output current relationship between the first and second thyristors connected in parallel in the prior art;

[0017] Figure 2 This is a circuit diagram of a parallel thyristor circuit according to an embodiment of the present invention;

[0018] Figure 3 This is a partial structural diagram of a parallel thyristor circuit according to an embodiment of the present invention;

[0019] The reference numerals in the attached figures are as follows:

[0020] 11 First Thyristor

[0021] 12 Second Thyristor

[0022] 21 First heat pipe

[0023] 22 Second heat pipe

[0024] 31 First Refrigeration Semiconductor

[0025] 32 Second Refrigeration Semiconductor

[0026] 50 regulator

[0027] 60 radiator Detailed Implementation

[0028] To make the objectives, technical solutions and advantages of this utility model clearer, the following embodiments will be used to further describe this utility model in detail.

[0029] Figure 1 A voltage drop-output current relationship diagram for the first thyristor 11 and the second thyristor 12 connected in parallel in the prior art;

[0030] like Figure 1 As shown, the first thyristor 11 and the second thyristor 12, which are connected in parallel, exhibit a curve-like relationship between their respective branch currents (I1, I2) and voltage drops. Specifically, for the first thyristor 11, a decrease in voltage drop results in a decrease in its branch current, and an increase in voltage drop results in an increase in its branch current; the same applies to the second thyristor 12. However, since they are in a parallel circuit and have the same voltage drop (both Vp), their respective branch currents differ. In existing technology, since it is impossible to adjust the two branch currents, only a larger thyristor can be selected to compensate for the current imbalance. A thyristor with a larger current draw leads to greater losses and higher temperature rise, thus exacerbating the current imbalance.

[0031] Figure 2 A circuit diagram of a parallel thyristor circuit according to an embodiment of the present invention is shown;

[0032] like Figure 2 As shown, the circuit includes a first thyristor 11 and a second thyristor 12 connected in parallel, a first heat pipe 21 and a second heat pipe 22, a first cooling semiconductor 31 and a second cooling semiconductor 32. The first heat pipe 21 includes a first end and a second end of the first heat pipe, and the second heat pipe 22 includes a first end and a second end of the second heat pipe, respectively. The first thyristor 11 is connected to the first end of the first heat pipe, the second end of the first heat pipe is connected to the first cooling semiconductor 31, the second thyristor 12 is connected to the first end of the second heat pipe, and the second end of the second heat pipe is connected to the second cooling semiconductor 32. The parallel thyristor circuit also includes a regulator 50. The regulator 50 has an adjustment input that is adapted to acquire the branch current of the first thyristor 11 and the branch current of the second thyristor 12. The regulator 50 has an adjustment output that is connected to the first cooling semiconductor 31 and the second cooling semiconductor 32, respectively, and is configured to adjust and control the first cooling semiconductor 31 and the second cooling semiconductor 32 based on the branch current of the first thyristor 11 and the branch current of the second thyristor 12.

[0033] As can be seen, based on this embodiment of the parallel thyristor circuit, by detecting the current of different branches, for the first thyristor 11 or the second thyristor 12 of the branch with a large current, the cooling of its corresponding first cooling semiconductor 31 or second cooling semiconductor 32 can be adjusted to reduce the junction temperature of the first thyristor 11 or the second thyristor 12 with a large current, thereby increasing the on-state voltage drop and reducing the branch current. This makes the current of the two branches of the thyristor relatively balanced, avoiding the negative temperature coefficient of the thyristor from exacerbating the current imbalance between the two branches.

[0034] According to some embodiments of this utility model, the regulator 50 can be a PI regulator 50. Of course, devices such as PID controller chips, digital signal processors (DSPs), microcontrollers (MCUs), etc., can also be used to perform time-limited PI regulation functions.

[0035] According to some embodiments of the present invention, the regulator 50 adjusts at least one of the cooling power of the first cooling semiconductor 31 and the cooling power of the second cooling semiconductor 32 based on the branch current of the first thyristor 11 and the branch current of the second thyristor 12.

[0036] Based on this embodiment, for the first thyristor 11 or the second thyristor 12 with a large branch current, the power of the corresponding first cooling semiconductor 31 or second cooling semiconductor 32 is adjusted by the regulator 50 to enhance its cooling function, thereby regulating the junction temperature of the thyristor. Those skilled in the art can set the power adjustment as needed, which will not be elaborated here.

[0037] According to some embodiments of the present invention, a current detection circuit is also included. The current detection circuit includes a first input terminal and a second input terminal, as well as a first output terminal and a second output terminal. The first input terminal is connected to the first thyristor 11, the second input terminal is connected to the second thyristor 12, and the first output terminal and the second output terminal are respectively connected to the adjustment input terminal of the regulator 50. The current detection circuit is adapted to detect the branch current of the first thyristor 11 and the branch current of the second thyristor 12 and output the detection result to the regulator 50.

[0038] Specifically, Hall sensors can be used to connect to the branch current output paths of the first thyristor 11 and the second thyristor 12 respectively, or Rogowski coils can be used to connect to the branch current output paths of the first thyristor 11 and the second thyristor 12 respectively. Those skilled in the art can choose according to their needs, and this application does not impose strict limitations.

[0039] Figure 3 This is a partial structural diagram of a parallel thyristor circuit according to an embodiment of the present invention;

[0040] like Figure 3 As shown, the parallel thyristor circuit is also connected to a heat sink 60. The top of the heat sink 60 has a first groove suitable for placing the first heat pipe 21, a second groove suitable for placing the second heat pipe 22, a third groove suitable for placing the first cooling semiconductor 31, and a fourth groove suitable for placing the second cooling semiconductor 32.

[0041] Specifically, the first thyristor 11 and the second thyristor 12 in the parallel thyristor circuit are respectively the first IGBT module and the second IGBT module. The first and second IGBT modules are mounted on a heat sink 60 using bolts or other fasteners. A third slot is formed on the heat sink 60 opposite the first IGBT module, and a fourth slot is formed opposite the second IGBT module. The third slot houses the first cooling semiconductor 31, and the fourth slot houses the second cooling semiconductor 32. A first slot is also provided between the first IGBT module and the third slot to house the first heat pipe 21, and a second slot is provided between the second IGBT module and the fourth slot to house the second heat pipe 22. The regulator 50 is not shown in the figure. This arrangement places the parallel thyristor circuit on a separate heat sink 60, reducing energy consumption in the thyristor circuit.

[0042] Based on the above embodiments, the first tank and the third tank are connected, and the second tank and the fourth tank are connected; and the first thyristor 11 is installed above the first tank, and the second thyristor 12 is installed above the second tank. This structure facilitates the fixing of the first heat pipe 21, the first cooling semiconductor 31, the second heat pipe 22, and the second cooling semiconductor 32, making installation convenient.

[0043] Furthermore, in the above embodiments, the heat sink 60 is an aluminum heat sink. Of course, other types of heat sinks can also be used, and this application does not limit them. Using an aluminum extruded heat sink results in relatively low cost.

[0044] According to another aspect of the present invention, a rectifier is also provided, which includes a parallel thyristor circuit of any of the above embodiments, thereby realizing current regulation of the parallel thyristor in the rectifier.

[0045] The rectifier based on the above embodiments further includes two or more sets of parallel-connected thyristor circuits. For example, Figure 3 As shown, three sets of first thyristors 11 and second thyristors 12 connected in parallel are included to achieve greater operating power. Optionally, these parallel thyristor circuits share the same regulator 50.

[0046] It should be noted that the terms "first" and "second" for the first and second thyristors mentioned above are merely illustrative and not strictly defined. Those skilled in the art will understand that the two can be interchanged in some scenarios in the above embodiments.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A parallel thyristor circuit, characterized in that, The system includes a first thyristor (11) and a second thyristor (12) connected in parallel, a first heat pipe (21) and a second heat pipe (22), a first cooling semiconductor (31) and a second cooling semiconductor (32), wherein the first heat pipe (21) includes a first end and a second end of the first heat pipe, the second heat pipe (22) includes a first end and a second end of the second heat pipe, the first thyristor (11) is connected to the first end of the first heat pipe, the second end of the first heat pipe is connected to the first cooling semiconductor (31), the second thyristor (12) is connected to the first end of the second heat pipe, and the second heat pipe... The second end of the tube is connected to the second cooling semiconductor (32). The parallel thyristor circuit also includes a regulator (50). The regulator (50) has its regulation input connected to the branch of the first thyristor (11) and the branch of the second thyristor (12). The regulator (50) has its regulation output connected to the first cooling semiconductor (31) and the second cooling semiconductor (32) respectively and is configured to regulate and control the first cooling semiconductor (31) and the second cooling semiconductor (32) based on the branch current of the first thyristor (11) and the branch current of the second thyristor (12).

2. The parallel thyristor circuit according to claim 1, characterized in that, The regulator (50) is a PI regulator (50).

3. The parallel thyristor circuit according to claim 1, characterized in that, The regulator (50) adjusts at least one of the cooling power of the first cooling semiconductor (31) and the cooling power of the second cooling semiconductor (32) according to the branch current of the first thyristor (11) and the branch current of the second thyristor (12).

4. The parallel thyristor circuit according to claim 1, characterized in that, It also includes a current detection circuit, which includes a first input terminal and a second input terminal, as well as a first output terminal and a second output terminal. The first input terminal is connected to the first thyristor (11), the second input terminal is connected to the second thyristor (12), and the first output terminal and the second output terminal are respectively connected to the adjustment input terminal of the regulator (50). The current detection circuit is adapted to detect the branch current of the first thyristor (11) and the branch current of the second thyristor (12) and output the detection result to the regulator (50).

5. The parallel thyristor circuit according to claim 1, characterized in that, The parallel thyristor circuit is also connected to the heat sink (60). The heat sink (60) has a first groove suitable for placing the first heat pipe (21), a second groove suitable for placing the second heat pipe (22), a third groove suitable for placing the first cooling semiconductor (31), and a fourth groove suitable for placing the second cooling semiconductor (32) on its top.

6. The parallel thyristor circuit according to claim 5, characterized in that, The first tank and the third tank are connected, and the second tank and the fourth tank are connected; and the first thyristor (11) is installed above the first tank, and the second thyristor (12) is installed above the second tank.

7. The parallel thyristor circuit according to claim 5 or 6, characterized in that, The radiator (60) is an aluminum radiator.

8. A rectifier, characterized in that, The rectifier is provided with a parallel thyristor circuit as described in any one of claims 1 to 7.

9. The rectifier according to claim 8, characterized in that, This includes two or more sets of parallel thyristor circuits.

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