Control device of high-power silicon-controlled direct-current power supply
By designing a high-power Thyristor DC power control device that uses complementary current limiting loops and voltage loops to automatically select, the problem of insufficient control accuracy and response speed in high-power applications is solved, and the output current equalization control is achieved, and the stability and efficiency of the power system are improved.
Patent Information
- Application Number
- CN202421583646.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In high-power application scenarios, traditional DC power control methods have problems such as low control accuracy and slow response speed, resulting in unbalanced output of each unit module, which may shorten the lifespan or cause failure.
A control device for a high-power thyristor DC power supply is designed, and the complementary automatic selection of the current limiting loop and the voltage loop is used to achieve the equalization control of the output current through a ring module composed of differential amplifier, resistor and capacitor.
Improves the stability and reliability of the power supply system, optimizes power efficiency, extends the life of power supply equipment, and reduces maintenance and operation costs.
Smart Images
Figure CN222776124U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power electronics, and in particular relates to a control device for a high-power thyristor direct current power supply. Background Art
[0002] Traditional DC power supply control methods often have problems such as low control accuracy and slow response speed. Especially in high-power application scenarios, due to the inconsistency of the unit modules, if the power supplies of each module are directly connected in parallel, the load will be unbalanced, resulting in some power modules having a shortened life due to excessive output power, or even failure. Therefore, it is necessary to use current balancing technology to balance the output current of each power module. Therefore, it is of great practical significance to develop a high-precision, high-response speed high-power thyristor DC power supply control method. Summary of the invention
[0003] A brief overview of the present invention is given below in order to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.
[0004] The problem to be solved by the utility model is to develop a high-precision, high-response speed high-power thyristor direct current power supply control device, and proposes a high-power thyristor direct current power supply control device.
[0005] A control device for a high-power thyristor DC power supply, comprising a first differential amplifier, a first resistor, a first capacitor, a second differential amplifier, a second resistor, a second capacitor, a single-channel DC power supply, a shunt, a third resistor, a third differential amplifier, a fourth differential amplifier, and a diode;
[0006] The first input end of the first differential amplifier is connected to a first resistor, the second input end of the first differential amplifier is connected to an output end of a third differential amplifier, the first resistor is connected to a first capacitor, and the first capacitor is respectively connected to an output end of the first differential amplifier, an output end of the second differential amplifier, and a single-channel DC power supply;
[0007] The first input terminal of the second differential amplifier is connected to the second resistor, the second input terminal of the second differential amplifier is connected to the output terminal of the third differential amplifier, the second resistor is connected to the second capacitor, and the second capacitor is connected to the output terminal of the second differential amplifier;
[0008] The single-channel DC power supply is connected to a shunt, the shunt is connected to a third resistor, the third resistor is respectively connected to a first input end of a third differential amplifier and a first input end of a fourth differential amplifier, the second input end of the third differential amplifier and the second input end of the fourth differential amplifier are respectively connected to one end of a diode, and the other end of the diode is connected to an output end of the fourth differential amplifier.
[0009] Furthermore, the first differential amplifier, the first resistor, and the first capacitor constitute a current limiting loop module, and the second differential amplifier, the second resistor, and the second capacitor constitute a voltage loop module.
[0010] Furthermore, the shunt is connected to a load.
[0011] Furthermore, the resistance of the first resistor, the second resistor, and the third resistor is 100 kΩ.
[0012] Furthermore, the capacitance value of the first capacitor (3) is 0.1uF, and the capacitance value of the second capacitor (6) is 0.1uF.
[0013] The beneficial effects of the utility model are:
[0014] The control device of a high-power thyristor DC power supply described in the utility model requires a current limiting loop to limit the output current. The output current can be controlled by adjusting the voltage of each power module, thereby realizing the control of the total output current. A smaller circuit is used between the current limiting loop and the voltage loop to select the control loop that needs to be adjusted. The selection of which control loop to work mainly depends on the level of the voltage loop output Vb and the current limiting loop output Va voltage signal. If an overcurrent occurs on the current limiting branch when the voltage has stabilized, the output voltage signal Va of the current limiting loop will be lower than the output voltage signal Vb of the voltage loop, and the current limiting loop will start to work and reduce the output voltage.
[0015] The utility model discloses a control device for a high-power thyristor DC power supply, which has a current-limiting maximum current and a current-sharing control, and adopts a voltage loop and a current-limiting loop to work in a complementary automatic selection manner, so that output voltage stability, branch current limiting, and total current balancing can be achieved together.
[0016] The control device of a high-power thyristor DC power supply described in the utility model can improve the stability of the power supply system: by controlling the current sharing, it can ensure the balanced current distribution of each parallel output branch, avoiding system instability or failure caused by excessive current difference between branches. Balanced current distribution helps to maintain the stable operation of the entire power supply system and improve the reliability of the system.
[0017] The control device of a high-power thyristor DC power supply described in the utility model can optimize the power supply efficiency: current equalization control can reduce the current deviation in the power supply system, thereby reducing the additional energy loss caused by uneven current. By optimizing the distribution of current, the overall efficiency of the power supply can be improved and unnecessary energy waste can be reduced.
[0018] The control device of a high-power thyristor DC power supply described in the utility model can extend the life of the power supply equipment: when the current distribution of each branch in the power supply system is uneven, some branches may bear too large a current load, resulting in overheating or accelerated aging. This situation can be effectively avoided by current balancing control, making the workload of each branch more balanced, thereby extending the service life of the power supply equipment.
[0019] The control device of a high-power thyristor DC power supply described in the utility model can improve the scalability of the power supply system: the high-power thyristor DC power supply system adopting the current limiting maximum current equalizing control method can conveniently achieve it by connecting more branches in parallel when the output power needs to be increased. Since the current limiting maximum current equalizing control can ensure that the newly added branch can be smoothly connected to the system, the scalability and flexibility of the system are improved.
[0020] The control device of a high-power thyristor DC power supply described in the utility model can reduce maintenance and operating costs: the current limiting maximum current equalizing control method helps to reduce faults and abnormalities in the power supply system, thereby reducing the frequency of maintenance and overhaul. This can not only reduce the workload of maintenance personnel, but also reduce downtime and maintenance costs caused by equipment failure.
[0021] The control device of a high-power thyristor DC power supply described in the utility model can improve the power supply quality: through the current limiting maximum current equalization control, it can ensure that the power supply output is more stable and smooth, and provide higher quality electric energy for the load. This is particularly important for some equipment or systems that have strict requirements on power supply quality, and helps to improve the operating performance and stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 The utility model is a schematic diagram of the structure of a control device of a high-power thyristor DC power supply. DETAILED DESCRIPTION
[0023] Hereinafter, exemplary embodiments of the present invention will be described in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the specific goals of the developers, for example, to meet those constraints related to the system and the business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, for those skilled in the art who benefit from the disclosure of the present invention, such development work is merely a routine task.
[0024] It is also necessary to explain here that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.
[0025] In order to further understand the content, features and functions of the utility model, the following specific implementation methods are given as examples, and the attached Figure 1 The detailed instructions are as follows:
[0026] A control device for a high-power thyristor DC power supply, comprising a first differential amplifier 1, a first resistor 2, a first capacitor 3, a second differential amplifier 4, a second resistor 5, a second capacitor 6, a single-channel DC power supply 7, a shunt 8, a third resistor 9, a third differential amplifier 10, a fourth differential amplifier 11, and a diode 12;
[0027] The first input end of the first differential amplifier 1 is connected to the first resistor 2, the second input end of the first differential amplifier 1 is connected to the output end of the third differential amplifier 10, the first resistor 2 is connected to the first capacitor 3, and the first capacitor 3 is respectively connected to the output end of the first differential amplifier 1, the output end of the second differential amplifier 4, and the single-channel DC power supply 7;
[0028] The first input end of the second differential amplifier 4 is connected to the second resistor 5, the second input end of the second differential amplifier 4 is connected to the output end of the third differential amplifier 10, the second resistor 5 is connected to the second capacitor 6, and the second capacitor 6 is connected to the output end of the second differential amplifier 4;
[0029] The single-channel DC power supply 7 is connected to a shunt 8, the shunt 8 is connected to a third resistor 9, the third resistor 9 is respectively connected to a first input end of a third differential amplifier 10 and a first input end of a fourth differential amplifier 11, the second input end of the third differential amplifier 10 and the second input end of the fourth differential amplifier 11 are respectively connected to one end of a diode 12, and the other end of the diode 12 is connected to the output end of the fourth differential amplifier 11.
[0030] Furthermore, the first differential amplifier 1, the first resistor 2, and the first capacitor 3 constitute a current limiting loop module, and the second differential amplifier 4, the second resistor 5, and the second capacitor 6 constitute a voltage loop module.
[0031] Furthermore, the shunt 8 is connected to a load.
[0032] Furthermore, the resistance of the first resistor 2 , the second resistor 5 , and the third resistor 9 is 100 kΩ.
[0033] Furthermore, the capacitance value of the first capacitor 3 is 0.1 uF, and the capacitance value of the second capacitor 6 is 0.1 uF.
[0034] Furthermore, the model of the diode 12 is 1N4148H.
[0035] Furthermore, the model of the differential amplifier is OPA354.
[0036] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0037] Although the present application has been described above with reference to specific embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various features in the specific embodiments disclosed in the present application may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A control device for a high-power thyristor DC power supply, characterized in that: The invention comprises a first differential amplifier (1), a first resistor (2), a first capacitor (3), a second differential amplifier (4), a second resistor (5), a second capacitor (6), a single-channel DC power supply (7), a shunt (8), a third resistor (9), a third differential amplifier (10), a fourth differential amplifier (11), and a diode (12); The first input end of the first differential amplifier (1) is connected to the first resistor (2), the second input end of the first differential amplifier (1) is connected to the output end of the third differential amplifier (10), the first resistor (2) is connected to the first capacitor (3), and the first capacitor (3) is respectively connected to the output end of the first differential amplifier (1), the output end of the second differential amplifier (4), and a single-channel DC power supply (7); The first input end of the second differential amplifier (4) is connected to the second resistor (5), the second input end of the second differential amplifier (4) is connected to the output end of the third differential amplifier (10), the second resistor (5) is connected to the second capacitor (6), and the second capacitor (6) is connected to the output end of the second differential amplifier (4); The single-channel DC power supply (7) is connected to a shunt (8), the shunt (8) is connected to a third resistor (9), the third resistor (9) is respectively connected to a first input end of a third differential amplifier (10) and a first input end of a fourth differential amplifier (11), the second input end of the third differential amplifier (10) and the second input end of the fourth differential amplifier (11) are respectively connected to one end of a diode (12), and the other end of the diode (12) is connected to an output end of the fourth differential amplifier (11).
2. The control device of a high-power thyristor DC power supply according to claim 1, characterized in that: The first differential amplifier (1), the first resistor (2) and the first capacitor (3) constitute a current limiting loop module, and the second differential amplifier (4), the second resistor (5) and the second capacitor (6) constitute a voltage loop module.
3. The control device of a high-power thyristor DC power supply according to claim 2, characterized in that: The shunt (8) is connected to a load.
4. The control device of a high-power thyristor DC power supply according to claim 3, characterized in that: The resistance values of the first resistor (2), the second resistor (5) and the third resistor (9) are 100 kΩ.
5. The control device of a high-power thyristor DC power supply according to claim 4, characterized in that: The capacitance value of the first capacitor (3) is 0.1uF, and the capacitance value of the second capacitor (6) is 0.1uF.