Molten salt heating power supply silicon controlled rectifier trigger power supply system

Abstract

The utility model discloses a silicon controlled rectifier trigger power supply system for a fused salt heating power supply, relates to the field of power supplies, and solves the problems of large size, high cost and the like caused by realizing the fused salt heating power supply through a transformer. The frequency and duty ratio are changed through the signal source, the power supply voltage of the pulse amplifier to the driving board is adjusted, the output current and frequency of the pulse amplifier are adjustable, the requirements of different occasions are met, the beam splitting plate is divided into multiple paths of pulses through the controller, the synchronism of multiple paths of optical signals is guaranteed, and the light splitting efficiency is improved. Therefore, the conduction consistency of the silicon controlled rectifiers in the series valve group is greatly improved, the probability that few silicon controlled rectifier modules in the series valve are damaged due to bearing over-high voltage for a long time is reduced, a transformer is not needed, the size is small, the weight is light, and the problems of large size, high cost and the like caused by realizing a molten salt heating power supply through the transformer are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power supply especially relates to a molten salt heating power supply silicon controlled rectifier trigger power supply system. BACKGROUND

[0002] The molten salt heating power supply adopts three-phase 10KV high-voltage incoming line, controls the silicon controlled rectifier output suitable voltage and current to generate heat through the power controller, so as to raise the temperature of the molten salt and meet the needs of industrial production and the like. The output power and other parameters will be selected according to the volume of the molten salt, the temperature rising speed requirement, the thermal efficiency of the heating system and other factors, and need to have certain stability and reliability to ensure that the heating process is continuously, safely and efficiently carried out.

[0003] Figure 1 It is a schematic diagram of a molten salt heating power supply silicon controlled rectifier series trigger power supply technical scheme, as shown in Figure 1 The primary side of the isolation transformer T1 is connected to an alternating current (AC) 220V power supply, and the secondary side charges the capacitor C20 through the resistor R13 and the diode D01. When the voltage on the capacitor C20 reaches the peak value of about 310V, the diode is reverse-biased and cut off, and the voltage on the capacitor C20 is maintained at about 310V. When the controller outputs a trigger pulse signal, the signal is transmitted to the pulse signal board through an optical fiber, and after photoelectric conversion, the transistor M1 is turned on, and the capacitor C20 starts to discharge through the resistor R12. Thus, there is a large instantaneous current through the 8 mutual inductors (CTs) connected to the gate of the silicon controlled rectifier module, and the CT generates 8 silicon controlled rectifier module trigger current signals.

[0004] Since the trigger power supply needs sufficient energy to meet the requirements of strong triggering of the thyristor series group, the transformer power and volume are large and numerous, occupying a large installation space, the equipment is heavy, the failure rate is high, the insulation strength between the primary and secondary windings of the transformer requires tens of thousands of volts, the transformer structure design is difficult, the manufacturing process is complex, and it is difficult to meet the mass production requirements; the transformer volume is too large, the capacity is too high, the cost is high, and the circuit is complex. Under the condition of high voltage (peak-to-peak value higher than 10KV) at the primary side, a 35KV isolation transformer is needed. The low voltage side of the isolation transformer generally comes from the control power supply. When the isolation transformer fails, it causes high voltage back to the string, damages the control power supply and components, and causes serious consequences; the high isolation voltage brings a large volume of isolation transformer, and the isolation performance is realized by the internal potting glue of the transformer. Under the condition of long-term contact with high peak-to-peak value harmonics, the isolation performance will be damaged and decreased within 3-5 years. Once the isolation is broken down, the primary voltage will return to the control power supply, and it is extremely likely to cause transformer inter-turn short circuit.

[0005] Therefore, how to solve the problems of large volume and high cost caused by the transformer in the molten salt heating power supply is a technical problem that needs to be solved by personnel in the field. Utility Model Content

[0006] The purpose of this invention is to provide a thyristor-triggered power supply system for molten salt heating, which solves the problems of large size and high cost caused by using a transformer to achieve molten salt heating power.

[0007] To solve the above technical problems, this utility model provides a thyristor-triggered power supply system for molten salt heating, comprising:

[0008] A signal source for generating pulse signals, a pulse amplifier, multiple driver boards for driving thyristors, a controller, a beam splitter with at least three output terminals, and at least nine thyristor valve assemblies;

[0009] The output of each phase of the three-phase power supply is connected to the input of at least three series-connected silicon controlled rectifier (SCR) valve groups; the output of the series-connected SCR valve groups is connected to the load; each driver board is connected to the control terminal of the SCR valve group; the signal source is connected to the pulse amplifier, and the pulse amplifier is connected to multiple corresponding driver boards; the controller is connected to the beam splitter, and multiple outputs of the beam splitter are connected to the driver boards.

[0010] As an alternative, in the above-mentioned molten salt heating power supply system with thyristor triggering, the thyristor valve group includes two anti-parallel unidirectional thyristors or one bidirectional thyristor.

[0011] The output of each phase of the three-phase power supply is connected to the input of at least three series-connected thyristor valve groups.

[0012] As an optional solution, in the above-mentioned molten salt heating power supply system triggered by a thyristor, the drive board includes: a coupling transformer;

[0013] The output of the pulse amplifier is connected to the primary terminal of the coupling transformer on the driver board.

[0014] As an alternative, in the aforementioned molten salt heating power supply system with thyristor triggering, when the three-phase power supply is a 10KV system power supply, the output terminal of each phase is connected to five valve groups connected in series.

[0015] As an optional solution, in the above-mentioned molten salt heating power supply system triggered by a thyristor, the thyristor valve group further includes: a first resistor, a second resistor, and a first capacitor;

[0016] The first resistor is connected in parallel across the two ends of the thyristor; the second resistor and the first capacitor are connected in series and then in parallel across the two ends of the thyristor.

[0017] As an alternative, in the aforementioned molten salt heating power supply system triggered by a silicon controlled rectifier, the beam splitter is connected to the driver board via an optical fiber.

[0018] As an option, the above-mentioned molten salt heating power supply thyristor triggering power supply system further comprises a plurality of fuses.

[0019] The output end of each phase of the three-phase power supply is connected to the input end of the series-connected thyristor valve group through a fuse.

[0020] As an option, the above-mentioned molten salt heating power supply thyristor triggering power supply system further comprises a first sampling circuit and a second sampling circuit.

[0021] The input end of the first sampling circuit is connected to the output end of each phase of the three-phase power supply, and the input end of the second sampling circuit is connected to the output end of the corresponding thyristor valve group of each phase of the three-phase power supply.

[0022] As an option, the above-mentioned molten salt heating power supply thyristor triggering power supply system further comprises a plurality of current sensors.

[0023] The current sensors are respectively connected in series at the output end of each phase of the three-phase power supply.

[0024] As an option, the above-mentioned molten salt heating power supply thyristor triggering power supply system further comprises a plurality of live display devices.

[0025] The live display devices are respectively connected in parallel at the output end of each phase of the three-phase power supply.

[0026] The molten salt heating power supply thyristor triggering power supply system provided by the utility model, comprising: a signal source for generating a pulse signal, a pulse amplifier, a plurality of drive boards for driving thyristors, a controller, a light splitting plate with at least three output ends, and at least nine thyristor valve groups; the output end of each phase of the three-phase power supply is connected to the input end of the at least three series-connected thyristor valve groups; the output end of the series-connected thyristor valve group is connected with a load; each drive board is respectively connected with the control end of the thyristor valve group; the signal source is connected with the pulse amplifier, and the pulse amplifier is connected with the plurality of drive boards corresponding to the same phase; the controller is connected with the light splitting plate, and the plurality of output ends of the light splitting plate are respectively connected with the drive boards. The application changes the frequency and duty cycle through the signal source, adjusts the power supply voltage of the pulse amplifier to the drive board, realizes the adjustable output current and frequency of the pulse amplifier, meets the requirements of different occasions, divides the same pulse into multiple paths through the controller, guarantees the simultaneity of the multiple optical signals, greatly improves the consistency of the thyristors in the series-connected valve group, reduces the probability of damage of a small number of thyristor modules in the series-connected valve due to long-time bearing of excessively high voltage, does not need to use a transformer, has small volume and light weight, and solves the problems of large volume and high cost caused by the molten salt heating power supply through the transformer. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 It is a schematic diagram of a technical scheme of a molten salt heating power supply thyristor series triggering power supply.

[0029] Figure 2 It is a schematic diagram of a thyristor triggering power supply system of a molten salt heating power supply provided by the embodiments of the present application.

[0030] Figure 3 It is a circuit diagram of a thyristor triggering power supply system of a molten salt heating power supply provided by the embodiments of the present application.

[0031] Among them, the signs are as follows: 11-signal source, 12-pulse amplifier, 13-driving board, 14-controller, 15-splitting board, 16-thyristor valve group. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0033] The core of the present application is to provide a thyristor triggering power supply system of a molten salt heating power supply.

[0034] In order to make those skilled in the art better understand the present application, the present application will be further described in combination with the drawings and specific embodiments.

[0035] In order to solve the above problems, the embodiments of the present application provide a thyristor triggering power supply system of a molten salt heating power supply, as shown in Figure 2 、 Figure 3 , which comprises:

[0036] a signal source 11 for generating a pulse signal, a pulse amplifier 12, a plurality of driving boards 13 for driving thyristors, a controller 14, a splitting board 15 with at least three output ends, and at least nine thyristor valve groups 16.

[0037] The output end of each phase of the three-phase power supply is connected to the input end of at least three series-connected thyristor valve groups 16; the output end of the series-connected thyristor valve groups 16 is connected to a load; each drive board 13 is respectively connected to the control end of the thyristor valve groups 16; the signal source 11 is connected to the pulse amplifier 12, the pulse amplifier 12 is connected to a plurality of drive boards 13 corresponding to the same phase; the controller 14 is connected to the light splitting board 15, and a plurality of output ends of the light splitting board 15 are respectively connected to the drive boards 13.

[0038] In this embodiment, the signal source 11 is used to generate a pulse signal, a controllable high-frequency narrow pulse signal, and the inductive power supply voltage of the optical fiber drive board 13 is adjusted by changing the duty cycle of the narrow pulse and adjusting the output of the pulse amplifier 12; the signal source 11 can be an oscillator generating a pulse signal with a specific frequency and duty cycle.

[0039] The pulse amplifier 12 is used to receive the pulse signal generated by the signal source 11 and amplify it to a level sufficient to drive the thyristor. The pulse amplifier 12 can be a power amplifier circuit that can amplify a small signal to a high current output.

[0040] Each drive board 13 is used to drive one or more thyristors to ensure that the thyristor can be turned on and off correctly according to the pulse signal. The number of drive boards 13 is set according to actual conditions.

[0041] The controller 14 is responsible for the coordination and control of the entire system, including the generation of pulse signals by the signal source 11 and the distribution of signals by the light splitting board 15. The controller 14 can be a microprocessor or a PLC (Programmable Logic Controller 14) to implement complex control logic.

[0042] The light splitting board 15 is a device that splits a single optical signal into multiple optical signals to synchronously drive multiple thyristors. The light splitting board 15 splits a single optical signal from the controller 14 into multiple optical signals to synchronously drive multiple thyristors. The light splitting board 15 can be an optical fiber splitter that uses optical fiber technology to split the signal.

[0043] The thyristor valve group 16 is a circuit composed of multiple thyristors for controlling the on-off of current. The thyristor valve group 16 can contain multiple anti-parallel thyristor modules to improve the reliability and stability of the system. At least three series-connected valve groups are connected to each phase.

[0044] The on state of the thyristor refers to the state of the thyristor after receiving a trigger signal, from the off state to the state of allowing current to pass through. The pulse signal generated by the signal source 11 and the signal amplified by the pulse amplifier 12 realize the power supply of the drive board.

[0045] The light signal is divided into multiple light signals by the light splitting plate 15 to realize the synchronous triggering of multiple thyristors. Multiple thyristors receive the trigger signal almost simultaneously, realizing synchronous conduction.

[0046] The molten salt heating power supply thyristor triggering power supply system provided by the embodiment of the application comprises a signal source 11 for generating a pulse signal, a pulse amplifier 12, a plurality of drive boards 13 for driving thyristors, a controller 14, a light splitting plate 15 with at least three output ends, and at least nine thyristor valve groups 16. The output end of each phase of a three-phase power supply is connected to the input end of at least three series-connected thyristor valve groups 16. The output end of the series-connected thyristor valve groups 16 is connected to a load. Each drive board 13 is connected to the control end of a thyristor valve group 16. The signal source 11 is connected to the pulse amplifier 12, and the pulse amplifier 12 is connected to a plurality of drive boards 13 corresponding to the same phase. The controller 14 is connected to the light splitting plate 15, and the plurality of output ends of the light splitting plate 15 are respectively connected to the drive boards 13. The application changes the frequency and duty cycle through the signal source 11, adjusts the size of the power supply voltage of the pulse amplifier 12 to the drive board 13, realizes the adjustable output current and frequency of the pulse amplifier 12, and is suitable for different requirements. The same pulse is split into multiple pulses by the controller 14 and the light splitting plate 15, ensuring the simultaneity of the multiple light signals, greatly improving the consistency of the conduction of the thyristors in the series-connected valve group, reducing the probability of damage of a small number of thyristor modules in the series-connected valve due to long-term bearing of excessively high voltage, and eliminating the need for a transformer, thereby reducing the volume and weight, and solving the problems of large volume and high cost caused by the molten salt heating power supply realized through a transformer.

[0047] According to the above embodiment, in a specific implementation scheme, the molten salt heating power supply thyristor triggering power supply system, the thyristor valve group 16 comprises two anti-parallel unidirectional thyristors or one bidirectional thyristor.

[0048] The output end of each phase of a three-phase power supply is connected to the input end of at least three series-connected thyristor valve groups 16.

[0049] The specific structure of the thyristor valve group 16 can be two anti-parallel unidirectional thyristors (anti-parallel means that the anode and cathode of the two thyristors are connected to each other) or one bidirectional thyristor, providing more flexibility and options to adapt to different application requirements. The output end of each phase of a three-phase power supply is connected to the input end of at least three thyristor valve groups 16, i.e., as shown in Figure 3 if the thyristor valve group 16 is two anti-parallel unidirectional thyristors, it is connected to the common end of the anti-parallel thyristors, and if the thyristor valve group 16 is a bidirectional thyristor, it is connected to any one end after series connection, and the other end serves as the output end.

[0050] By connecting the output end of each phase of the three-phase power supply to the common end of at least three series-connected thyristor valve groups 16, balanced distribution of the three-phase power supply and stable power supply of the load are achieved.

[0051] According to the above embodiment, in a specific implementation, the drive board 13 includes a coupling transformer.

[0052] The output end of the pulse amplifier 12 is connected to the primary end of the coupling transformer of the drive board 13.

[0053] By connecting the output end of the pulse amplifier 12 to the primary end of the coupling transformer of the drive board 13, energy is inducted to the secondary side through the coupling transformer, achieving complete isolation between the primary side and the secondary side of the power supply, and completely solving the anti-electric isolation problem between the high-voltage main circuit and the low-voltage control circuit.

[0054] The coupling transformer is an electromagnetic induction device used to transfer energy and signals between high-voltage and low-voltage circuits while achieving isolation. By using the coupling transformer to achieve isolation between the pulse amplifier 12 and the drive board 13, the safety and reliability of the system are improved.

[0055] According to the above embodiment, when the three-phase power supply is a 6KV system power supply, three thyristor valve groups 16 are sufficient. In a specific implementation, when the three-phase power supply is a 10KV system power supply, the output end of each phase is connected to five series-connected valve groups.

[0056] The 10KV system power supply refers to a three-phase high-voltage power supply system with a voltage level of 10KV. The output end of each phase is connected to five series-connected valve groups, achieving stable control and voltage division effect under higher voltage levels.

[0057] In the 10KV system power supply, the output end of each phase is connected to more valve groups to distribute the voltage. By increasing the number of valve groups, the voltage borne by a single thyristor can be reduced, improving the stability and safety of the system.

[0058] According to the above embodiment, in a specific implementation, the thyristor valve group 16 further includes a first resistor, a second resistor, and a first capacitor.

[0059] The first resistor is connected in parallel across the thyristor; and the second resistor and the first capacitor are connected in series and then connected in parallel across the thyristor.

[0060] The first resistor is connected in parallel across the thyristor, achieving voltage division protection for the thyristor; and the second resistor and the first capacitor are connected in series and then connected in parallel across the thyristor, achieving resistance-capacitance absorption for absorbing overvoltage when the circuit is turned on and off.

[0061] These elements can reduce voltage and current surges across the thyristor, prolong the service life of the thyristor, and improve the stability of the system.

[0062] According to the above embodiment, in a specific implementation, the light splitting plate 15 is connected to the drive plate 13 through an optical fiber.

[0063] The optical fiber is an optical fiber used for transmitting optical signals. The light splitting plate 15 distributes the optical signals to multiple drive plates 13.

[0064] The optical fiber connection provides high-speed, anti-interference signal transmission, ensuring the synchronization of the trigger signal. The high-speed, anti-interference signal transmission between the light splitting plate 15 and the drive plate 13 is achieved through the optical fiber, ensuring the synchronization of the trigger signal.

[0065] According to the above embodiment, in a specific implementation, as shown in Figure 3 , it further includes a plurality of fuses FU;

[0066] The output end of each phase of the three-phase power supply is connected to the input end of the series-connected thyristor valve group 16 through a fuse.

[0067] The fuse is an overload protection device used to protect the circuit. The fuse can be a high-current fuse used to disconnect the circuit when the current is abnormal, protecting the system from damage.

[0068] The fuse provides additional safety protection against damage caused by overloads and short circuits.

[0069] According to the above embodiment, in a specific implementation, it further includes a first sampling circuit and a second sampling circuit.

[0070] The input end of the first sampling circuit is connected to the output end of each phase of the three-phase power supply; the input end of the second sampling circuit is connected to the output end of the corresponding thyristor valve group 16 of each phase of the three-phase power supply.

[0071] The sampling circuit is used to monitor the output state of the power supply and the valve group. The sampling circuit can contain voltage or current sensors for real-time monitoring. The sampling circuit provides real-time monitoring of the output of the power supply and the valve group, which helps in fault diagnosis and system maintenance.

[0072] As shown in Figure 3 , the first sampling circuit includes transformers PT1 and PT2, and the second sampling circuit includes transformer PT3, which realizes sampling through transformers.

[0073] According to the above embodiment, in a specific implementation, it further includes a plurality of current sensors LHa.

[0074] The current sensors are respectively connected in series at the output end of each phase of the three-phase power supply.

[0075] The current sensor is used for monitoring the current of the three-phase power supply. The current sensor can be a Hall effect sensor for non-contact current measurement. The current sensor provides real-time monitoring of the three-phase power supply current, which helps load management and system safety.

[0076] According to the above-mentioned embodiments, in a specific implementation, further comprising: a plurality of live display devices;

[0077] The live display devices are respectively connected in series at the output end of each phase of the three-phase power supply.

[0078] The live display devices are used to indicate whether the three-phase power supply is live. The live display devices can be light-emitting diode (LED) indicator lights or audible and visual alarms. The live display devices provide intuitive power supply status indication, which helps operation safety. As shown in Figure 3 Each phase is connected to the live display device through CG1, CG2, and CG3, respectively. A plurality of control switches CJ are connected between each phase and the valve group, and the controller controls the control switches CJ to achieve individual control.

[0079] The above provides a detailed introduction to the molten salt heating power supply silicon controlled trigger power supply system. The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts are described in the method part. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0080] It should be further noted that in the present specification, 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 that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or device comprising the element.

Claims

1. A molten salt heating power supply thyristor trigger power supply system, characterized by, Comprise: A signal source (11) for generating pulse signal, a pulse amplifier (12), a plurality of drive boards (13) for driving thyristor, a controller (14), a light splitting plate (15) of at least three output ends, at least nine thyristor valve groups (16); The output end of each phase of the three-phase power supply is connected to the input end of at least three series-connected thyristor valve groups (16); the output end of the series-connected thyristor valve groups (16) is connected with a load; each drive board (13) is respectively connected with the control end of the thyristor valve group (16); the signal source (11) is connected with the pulse amplifier (12), and the pulse amplifier (12) is connected with a plurality of drive boards (13) corresponding to the same phase; the controller (14) is connected with the light splitting plate (15), and a plurality of output ends of the light splitting plate (15) are respectively connected with the drive boards (13).

2. The molten salt heating thyristor triggered power supply system of claim 1, wherein, The thyristor valve group (16) comprises two anti-parallel unidirectional thyristors or one bidirectional thyristor; The output end of each phase of the three-phase power supply is connected to the input end of at least three series-connected thyristor valve groups (16).

3. The molten salt heating thyristor trigger power supply system of claim 2, wherein, The drive board (13) comprises a coupling transformer; The output end of the pulse amplifier (12) is connected with the primary end of the coupling transformer of the drive board (13).

4. The molten salt heating thyristor trigger power supply system of claim 3, wherein, When the three-phase power supply is a 10KV system power supply, the output end of each phase is connected to five series-connected valve groups.

5. The molten salt heating thyristor triggered power supply system of claim 1, wherein, The thyristor valve group (16) further comprises a first resistor, a second resistor and a first capacitor; The first resistor is connected in parallel across the thyristor; the second resistor and the first capacitor are connected in series and then connected in parallel across the thyristor.

6. The molten salt heating thyristor triggered power supply system of claim 1, wherein, The light splitting plate (15) is connected with the drive board (13) through an optical fiber.

7. The molten salt heating thyristor triggered power supply system of claim 1, wherein, Further comprise: A plurality of fuses; The output end of each phase of the three-phase power supply is connected to the input end of the series-connected thyristor valve group (16) through the fuse.

8. The molten salt heating thyristor triggered power supply system of claim 1, wherein, Further comprise: A first sampling circuit; A second sampling circuit; The input end of the first sampling circuit is connected with the output end of each phase of the three-phase power supply; the input end of the second sampling circuit is connected with the output end of the thyristor valve group (16) corresponding to each phase of the three-phase power supply.

9. The molten salt heating thyristor triggered power supply system of claim 1, wherein, Further comprise: A plurality of current sensors; The current sensor is respectively connected in series at the output end of each phase of the three-phase power supply.

10. The molten salt heating thyristor triggered power supply system of claim 1, wherein, Further comprise: A plurality of live display devices; The live display device is respectively connected in parallel at the output end of each phase of the three-phase power supply.

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