Flyback switching power supply suitable for DCS (Distributed Control System) of power plant

Abstract

The invention relates to a flyback switching power supply suitable for a DCS (Distributed Control System) of a power plant. The flyback switching power supply comprises a control module, a driving module, a step-down conversion module, a first output module and a second output module, the control module outputs a control signal to the driving module, and the driving module controls the on-off of the power supply main switching tube. The output of the driving module is connected to the step-down conversion module, and the step-down conversion module converts alternating-current high voltage into multiple paths of alternating-current low-voltage signals and transmits the alternating-current low-voltage signals to the first output module and the second output module respectively. The first output module provides positive and negative 5V, negative 5V, positive and negative 24V and negative 24V direct current power supplies; and the second output module outputs a positive and negative 12V direct-current power supply. Through the step-down conversion module, the system converts high-voltage alternating current into multiple paths of low-voltage signals, so that accurate voltage and current control is realized, and the power conversion efficiency and stability are improved. The control module can adjust the output of the driving module according to actual requirements, and the conversion efficiency is further optimized. The performance of the power supply system is effectively improved, and various power requirements are met.

Description

Technical Field

[0001] The invention relates to a flyback switching power supply suitable for a DCS system of a power plant, belonging to the technical field of industrial control. Background Art

[0002] In modern power plants, distributed control systems (DCS) are a key component to ensure safe, stable and efficient operation of power plants. DCS systems rely on stable and reliable power supply, and the performance of switching power supplies, as the core power supply module of DCS systems, directly affects the reliability and stability of the entire system. Flyback switching power supplies are widely used in traditional power plant DCS systems. The power supply has a simple structure and low cost, and is suitable for small and medium power applications. However, with the continuous improvement of power plant requirements for DCS systems, traditional flyback switching power supplies have gradually exposed the problem of large output voltage ripple in practical applications: during the operation of flyback switching power supplies, due to the high-frequency on-off operation of switching devices, it is easy to cause fluctuations in output voltage, that is, the output voltage ripple is large. This ripple may interfere with the precision electronic equipment of the DCS system, affect its normal operation, and even cause measurement and control errors.

[0003] Existing technologies such as the Chinese patent number "CN112736890A" disclose a working circuit including a DCS power supply and a DCS power supply system. The problem with this circuit is that although it also includes an AC / DC power supply for power conversion, the overall conversion efficiency and stability may be affected by many factors, such as the performance of the main control baseboard, the loss of the transmission circuit, etc. The lack of a precise control mechanism may make it impossible to achieve stable output voltage and current while ensuring power conversion efficiency. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention proposes a flyback switching power supply suitable for a DCS system of a power plant.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a flyback switching power supply suitable for a DCS system of a power plant, comprising a control module, a drive module, a step-down conversion module, a first output module, and a second output module;

[0007] The output end of the control module is connected to the input end of the driving module, the output end of the driving module is connected to the input end of the buck conversion module, and the output end of the buck conversion module is connected to the first output module and the second output module respectively;

[0008] The control module outputs a control signal to the driving module;

[0009] The driving module is used to drive the main switch of the power supply to turn on and off;

[0010] The step-down conversion module converts the AC high voltage into multiple AC low voltage signals and outputs them to the first output module and the second output module;

[0011] The first output module is used to output a DC power supply of positive and negative 5V, negative 5V, positive and negative 24V, and negative 24V;

[0012] The second output module is used to output a positive and negative 12V DC power supply.

[0013] As a preferred implementation, the control module includes a power management chip;

[0014] The power management chip can perform accurate duty cycle control and drive the first power MOS tube.

[0015] As a preferred implementation, the driving module includes a second diode and a first MOS tube;

[0016] The first MOS tube is used to control and adjust voltage.

[0017] As a preferred implementation, the step-down conversion module includes a first transformer, a second transformer and a third transformer;

[0018] The first transformer, the second transformer and the third transformer are used to convert high voltage alternating current into low voltage alternating current of corresponding levels.

[0019] As a preferred implementation, the first output module includes a first reference voltage stabilizing chip;

[0020] The second output module includes a second reference voltage stabilizing chip, a third reference voltage stabilizing chip, and a fan;

[0021] The first reference voltage stabilizing chip, the second reference voltage stabilizing chip, and the third reference voltage stabilizing chip are used to output a fixed voltage value to ensure that the output voltage is within a rated range.

[0022] As a preferred implementation manner, the pulse width modulation signal pin of the power management chip is respectively connected to one end of a forty-ninth resistor and one end of an eleventh capacitor, the other end of the forty-ninth resistor is connected to the power supply through the twenty-sixth resistor, the other end of the eleventh capacitor is connected to one end of a fifty-fourth resistor, one end of the fifty-fourth resistor is also connected to the power supply through the twenty-sixth resistor, and the other end of the fifty-fourth resistor is grounded;

[0023] The current sampling input pin of the power management chip is grounded through a fifty-fourth resistor;

[0024] The voltage sampling input pin of the power management chip is grounded through a seventeenth capacitor;

[0025] The frequency signal output pin of the power management chip is grounded through a twenty-fifth capacitor, and the frequency signal output pin of the power management chip is also connected to the voltage sampling input pin of the power management chip through a fifty-third resistor;

[0026] The negative power supply pin of the power management chip is grounded;

[0027] The on / off signal input pin of the power management chip is respectively connected to one end of the twenty-sixth resistor and one end of the fifty-second resistor, the other end of the twenty-sixth resistor is grounded, and the other end of the fifty-second resistor is grounded after passing through the fifty-fifth resistor;

[0028] The chip power supply positive electrode pin of the power management chip is connected to the cathode of the first diode, and the anode of the first diode is connected to the power supply through the twenty-fifth resistor.

[0029] As a preferred implementation manner, the other end of the fifty-second resistor is also connected to the source of the first MOS tube, the gate of the first MOS tube is respectively connected to one end of the fiftieth resistor, the positive electrode of the second diode, and one end of the fifty-first resistor, the other end of the fifty-first resistor is grounded, and the negative electrode of the second diode and the other end of the fifty-first resistor are connected to the drive output signal pin of the power management chip;

[0030] The drain of the first MOS tube is connected to the anode of the third diode.

[0031] As a preferred embodiment, the cathode of the first diode is also connected to the anode of the voltage zener diode, one end of the ninth capacitor, one end of the eleventh capacitor, and one end of the forty-seventh resistor, the cathode of the voltage zener diode is grounded, the other end of the ninth capacitor is grounded, and the other end of the eleventh capacitor is grounded;

[0032] The other end of the forty-seventh resistor is connected to one end of the forty-eighth resistor and one end of the tenth capacitor respectively, the other end of the forty-eighth resistor and the other end of the tenth capacitor are connected to the cathode of the third diode, and the other end of the forty-seventh resistor and the rectifier power supply are connected to the anode of the third diode through the primary coil of the first transformer;

[0033] The anode of the fourth diode is grounded through the primary coil of the second transformer;

[0034] The cathode of the ninth diode is respectively connected to one end of the sixth capacitor, one end of the twenty-seventh capacitor, and the fan, the anode of the ninth diode is connected to the common cathode VSS through the secondary coil of the second transformer, and the other end of the sixth capacitor and the other end of the twenty-seventh capacitor are connected to the common cathode VSS;

[0035] The cathode of the twelfth diode is respectively connected to one end of the thirteenth capacitor, one end of the fifteenth capacitor, and the input pin of the second reference voltage stabilizing chip, the anode of the twelfth diode is connected to the common cathode VSS through the secondary coil of the third transformer, and the other end of the thirteenth capacitor and the other end of the fifteenth capacitor are connected to the common cathode VSS.

[0036] As a preferred implementation manner, the cathode of the fourth diode is respectively connected to one end of the fourteenth capacitor, the twenty-ninth capacitor, the input pin of the first reference voltage regulator chip, and the first output power supply, and the other end of the fourteenth capacitor and the other end of the twenty-ninth capacitor are grounded;

[0037] The ground pin of the first reference voltage stabilizing chip is grounded, and the output pin of the first reference voltage stabilizing chip is respectively connected to the second output power supply, one end of the 30th capacitor, and one end of the third capacitor, and the other end of the 30th capacitor and the other end of the third capacitor are grounded.

[0038] As a preferred embodiment, the ground pin of the second reference voltage stabilizing chip is connected to the common negative electrode VSS, the output pin of the second reference voltage stabilizing chip is respectively connected to one end of the sixteenth capacitor, the third output power supply, one end of the twenty-eighth capacitor, and the input pin of the third reference voltage stabilizing chip, and the other end of the twenty-sixth capacitor, the other end of the twenty-eighth capacitor, and the ground pin of the third reference voltage stabilizing chip are connected to the common negative electrode VSS;

[0039] The output pins of the third reference voltage stabilizing chip are respectively connected to the fourth output power supply, one end of the ninth capacitor, and one end of the fifteenth capacitor, and the other ends of the ninth capacitor and the fifteenth capacitor are connected to the common negative electrode VSS.

[0040] The present invention has the following beneficial effects:

[0041] The present invention fills the market gap and can realize flexible access to the common DCS control system in my country, so that it has the same functions as the original brand power supply. It alleviates the current situation that our spare parts procurement is restricted by foreign manufacturers. The present invention can design a flyback switching power supply that can provide multi-channel power output and power supply parameters consistent with most brands according to the design characteristics of the power module of the common imported brand distributed control system of power plants in my country. The present invention adopts conventional wiring terminal output. The user only needs to remove the original power wiring socket and connect it to the output terminal corresponding to this power supply to directly replace it. For imported brands with expensive procurement prices, long procurement cycles and technical monopoly, the price of this power supply is one-tenth of that of imported brands. The production and manufacturing are simple and easy, and can be mass-produced, and there is always stock available. The present invention converts AC high voltage into multiple AC low voltage signals through a step-down conversion module, and outputs them to the first output module and the second output module. This design can accurately control the output voltage and current, thereby improving the power conversion efficiency and stability. At the same time, the control module can also adjust the output of the drive module according to actual needs to further optimize the power conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a module connection diagram of the present invention.

[0043] Figure 2 This is a circuit connection topology diagram of the present invention.

[0044] Figure 3 This is a detailed diagram of the control module of the present invention.

[0045] Figure 4 This is a detailed diagram of the drive module of the present invention.

[0046] Figure 5 This is a detailed diagram of the buck conversion module of the present invention.

[0047] Figure 6 This is a detailed diagram of the first output module of the present invention.

[0048] Figure 7 This is a detailed diagram of the second output module of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be understood that the step numbers used in this article are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0051] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0052] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0053] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0054] Embodiment 1:

[0055] In this embodiment, the first diode is Figure 2 The second diode is marked as D1. Figure 2 The third diode is marked as D2. Figure 2 The fourth diode is D3, Figure 2 The ninth diode is marked as D4. Figure 2 The twelfth diode is marked as D9. Figure 2 The voltage regulator diode is marked as D12. Figure 2 DW marked in;

[0056] The power management chip is Figure 2 The UC1 marked in the figure is model UC3845;

[0057] The first reference voltage regulator chip is Figure 2 JZ1 marked in the middle;

[0058] The second reference voltage regulator chip is Figure 2 JZ2 marked in the middle;

[0059] The third reference voltage stabilizing chip is Figure 2 JZ3 marked in the middle;

[0060] The rectifier power supply is Figure 2 DC marked in;

[0061] The first MOS tube is Figure 2 Q18 marked in the figure is a CMOS tube;

[0062] The first output power supply is Figure 2 VV1 (output 12V power supply) marked in the figure;

[0063] The second output power supply is Figure 2 VV2 (output 12V power supply) marked in the figure;

[0064] The third output power supply is Figure 2 VV3 (output 24V power supply) marked in the figure;

[0065] The fourth output power is Figure 2 VV4 (output 5V power supply) marked in the figure;

[0066] The fan is Figure 2 FAN marked in;

[0067] The pulse width modulation signal pin of the power management chip is Figure 2 Pin 1 of the UC1 chip marked in the figure;

[0068] The current sampling input pin of the power management chip is Figure 2 Pin 2 of the UC1 chip marked in the figure;

[0069] The on / off signal input pin of the power management chip is Figure 2 Pin 3 of the UC1 chip marked in the figure;

[0070] The voltage sampling input pin of the power management chip is Figure 2 Pin 4 of the UC1 chip marked in the figure;

[0071] The negative power supply pin of the power management chip is Figure 2 Pin 5 of the UC1 chip marked in the figure;

[0072] The drive output signal pin of the power management chip is Figure 2 Pin 6 of the UC1 chip marked in the figure;

[0073] The positive pin of the chip power supply of the power management chip is Figure 2 Pin 7 of the UC1 chip marked in the figure;

[0074] The frequency signal output pin of the power management chip is Figure 2 Pin 8 of the UC1 chip marked in the figure;

[0075] The first transformer is Figure 2 B1 marked in the figure (the primary coil is on the left and the secondary coil is on the right);

[0076] The second transformer is Figure 2 B2 marked in the middle;

[0077] The third transformer is Figure 2 B3 marked in the middle;

[0078] The fifty-fourth resistor is Figure 2 The forty-ninth resistor is R54. Figure 2 The 26th resistor is R49. Figure 2 The 25th resistor is marked as R26. Figure 2 The fifty-third resistor is R25. Figure 2 The forty-seventh resistor is R53. Figure 2 The forty-eighth resistor is R47. Figure 2 The fifty-first resistor is R48 marked in Figure 2 The fifty-second resistor is R51. Figure 2 The 50th resistor is marked as R52. Figure 2 The fifty-fifth resistor is R50. Figure 2 R55 marked in;

[0079] The seventeenth capacitor is Figure 2 The 25th capacitor is marked as C17. Figure 2 The eleventh capacitor is marked as C25. Figure 2 The ninth capacitor is marked as C11. Figure 2 The tenth capacitor is marked as C9. Figure 2 The fifteenth capacitor is marked as C10. Figure 2 The 28th capacitor is marked as C15. Figure 2 The thirteenth capacitor is marked as C28. Figure 2 The 27th capacitor is marked as C13. Figure 2 The 30th capacitor is marked as C27. Figure 2 The 29th capacitor is marked as C30. Figure 2 The 27th capacitor is marked as C29. Figure 2 C26 marked in;

[0080] The eleventh capacitor is Figure 2 The marked E11 is an electrolytic capacitor, and the third capacitor is Figure 2 The E3 marked in the figure is an electrolytic capacitor, and the fourteenth capacitor is Figure 2 The E14 marked in the figure is an electrolytic capacitor, and the ninth capacitor is Figure 2 The E9 marked in the figure is an electrolytic capacitor, and the sixteenth capacitor is Figure 2 The E16 marked in the figure is an electrolytic capacitor, and the fifteenth capacitor is Figure 2The E15 marked in the figure is an electrolytic capacitor, and the sixth capacitor is Figure 2 The E6 marked in the figure is an electrolytic capacitor.

[0081] See also Figure 1-2 , the present invention provides a flyback switching power supply suitable for a DCS system of a power plant, comprising a control module, a drive module, a buck conversion module, a first output module, and a second output module;

[0082] The output end of the control module is connected to the input end of the driving module, the output end of the driving module is connected to the input end of the buck conversion module, and the output end of the buck conversion module is connected to the first output module and the second output module respectively;

[0083] The control module outputs a control signal to the driving module;

[0084] The driving module is used to drive the main switch of the power supply to turn on and off;

[0085] The step-down conversion module converts the AC high voltage into multiple AC low voltage signals and outputs them to the first output module and the second output module;

[0086] The first output module is used to output a DC power supply of positive and negative 5V, negative 5V, positive and negative 24V, and negative 24V;

[0087] The second output module is used to output a positive and negative 12V DC power supply.

[0088] As a preferred implementation, the control module includes a power management chip;

[0089] The power management chip can perform accurate duty cycle control and drive the first power MOS tube.

[0090] As a preferred implementation, the driving module includes a second diode and a first MOS tube;

[0091] The first MOS tube is used to control and adjust voltage.

[0092] As a preferred implementation, the step-down conversion module includes a first transformer, a second transformer and a third transformer;

[0093] The first transformer, the second transformer and the third transformer are used to convert high voltage alternating current into low voltage alternating current of corresponding levels.

[0094] As a preferred implementation, the first output module includes a first reference voltage stabilizing chip;

[0095] The second output module includes a second reference voltage stabilizing chip, a third reference voltage stabilizing chip, and a fan;

[0096] The first reference voltage stabilizing chip, the second reference voltage stabilizing chip, and the third reference voltage stabilizing chip are used to output a fixed voltage value to ensure that the output voltage is within a rated range.

[0097] See also Figure 3 As a preferred implementation, the pulse width modulation signal pin of the power management chip is respectively connected to one end of the forty-ninth resistor and one end of the eleventh capacitor, the other end of the forty-ninth resistor is connected to the power supply through the twenty-sixth resistor, the other end of the eleventh capacitor is connected to one end of the fifty-fourth resistor, one end of the fifty-fourth resistor is also connected to the power supply through the twenty-sixth resistor, and the other end of the fifty-fourth resistor is grounded;

[0098] The current sampling input pin of the power management chip is grounded through a fifty-fourth resistor;

[0099] The voltage sampling input pin of the power management chip is grounded through a seventeenth capacitor;

[0100] The frequency signal output pin of the power management chip is grounded through a twenty-fifth capacitor, and the frequency signal output pin of the power management chip is also connected to the voltage sampling input pin of the power management chip through a fifty-third resistor;

[0101] The negative power supply pin of the power management chip is grounded;

[0102] The on / off signal input pin of the power management chip is respectively connected to one end of the twenty-sixth resistor and one end of the fifty-second resistor, the other end of the twenty-sixth resistor is grounded, and the other end of the fifty-second resistor is grounded after passing through the fifty-fifth resistor;

[0103] The chip power supply positive electrode pin of the power management chip is connected to the cathode of the first diode, and the anode of the first diode is connected to the power supply through the twenty-fifth resistor.

[0104] Through the power management chip, precise control of the entire power system is achieved, including functions such as voltage regulation, current monitoring and fault protection, which improves the overall efficiency and stability of the system. The power management chip can adjust the duty cycle and frequency of the PWM signal in real time according to the load demand, thereby optimizing the power output and reducing energy waste. Through the current sampling and voltage sampling functions, the control module can promptly detect and handle abnormal conditions in the power system, such as overcurrent, overvoltage, etc., to protect the system from damage.

[0105] See also Figure 4As a preferred embodiment, the other end of the fifty-second resistor is also connected to the source of the first MOS tube, the gate of the first MOS tube is respectively connected to one end of the fiftieth resistor, the positive electrode of the second diode, and one end of the fifty-first resistor, the other end of the fifty-first resistor is grounded, and the cathode of the second diode and the other end of the fifty-first resistor are connected to the drive output signal pin of the power management chip;

[0106] The drain of the first MOS tube is connected to the anode of the third diode.

[0107] Through the current sampling and voltage sampling functions, the control module can promptly detect and handle abnormal conditions in the power system, such as overcurrent, overvoltage, etc., to protect the system from damage. MOS tubes have a lower on-resistance when turned on, which can reduce energy loss and improve the overall efficiency of the power system.

[0108] See also Figure 5 As a preferred embodiment, the cathode of the first diode is also connected to the anode of the voltage zener diode, one end of the ninth capacitor, one end of the eleventh capacitor, and one end of the forty-seventh resistor, the cathode of the voltage zener diode is grounded, the other end of the ninth capacitor is grounded, and the other end of the eleventh capacitor is grounded;

[0109] The other end of the forty-seventh resistor is connected to one end of the forty-eighth resistor and one end of the tenth capacitor respectively, the other end of the forty-eighth resistor and the other end of the tenth capacitor are connected to the cathode of the third diode, and the other end of the forty-seventh resistor and the rectifier power supply are connected to the anode of the third diode through the primary coil of the first transformer;

[0110] The anode of the fourth diode is grounded through the primary coil of the second transformer;

[0111] The cathode of the ninth diode is respectively connected to one end of the sixth capacitor, one end of the twenty-seventh capacitor, and the fan, the anode of the ninth diode is connected to the common cathode VSS through the secondary coil of the second transformer, and the other end of the sixth capacitor and the other end of the twenty-seventh capacitor are connected to the common cathode VSS;

[0112] The cathode of the twelfth diode is respectively connected to one end of the thirteenth capacitor, one end of the fifteenth capacitor, and the input pin of the second reference voltage stabilizing chip, the anode of the twelfth diode is connected to the common cathode VSS through the secondary coil of the third transformer, and the other end of the thirteenth capacitor and the other end of the fifteenth capacitor are connected to the common cathode VSS.

[0113] Through the different turns ratios of the transformer, the step-down conversion module can convert the input AC high voltage into low voltage outputs of various voltage levels to meet the voltage requirements of different load devices. The transformer can achieve electrical isolation between input and output, preventing the fault on the high voltage side from affecting the low voltage side, thereby improving the safety of the system.

[0114] See also Figure 6 As a preferred embodiment, the cathode of the fourth diode is respectively connected to one end of the fourteenth capacitor, the twenty-ninth capacitor, the input pin of the first reference voltage regulator chip, and the first output power supply, and the other end of the fourteenth capacitor and the other end of the twenty-ninth capacitor are grounded;

[0115] The ground pin of the first reference voltage stabilizing chip is grounded, and the output pin of the first reference voltage stabilizing chip is respectively connected to the second output power supply, one end of the 30th capacitor, and one end of the third capacitor, and the other end of the 30th capacitor and the other end of the third capacitor are grounded.

[0116] See also Figure 7 As a preferred embodiment, the ground pin of the second reference voltage stabilizing chip is connected to the common negative electrode VSS, the output pin of the second reference voltage stabilizing chip is respectively connected to one end of the sixteenth capacitor, the third output power supply, one end of the twenty-eighth capacitor, and the input pin of the third reference voltage stabilizing chip, and the other end of the twenty-sixth capacitor, the other end of the twenty-eighth capacitor, and the ground pin of the third reference voltage stabilizing chip are connected to the common negative electrode VSS;

[0117] The output pins of the third reference voltage stabilizing chip are respectively connected to the fourth output power supply, one end of the ninth capacitor, and one end of the fifteenth capacitor, and the other ends of the ninth capacitor and the fifteenth capacitor are connected to the common negative electrode VSS.

[0118] The reference voltage regulator chip can ensure the stability and accuracy of the output voltage, and can keep the output voltage constant even when the load changes or the input voltage fluctuates. The first output module and the second output module provide DC power outputs of multiple voltage levels, respectively, to meet the voltage requirements of different load devices and improve the flexibility and adaptability of the power supply system. The second output module is equipped with heat dissipation equipment such as fans, which can dissipate the heat generated by the power supply system in time to prevent system overheating from causing failures or performance degradation.

[0119] Embodiment 2:

[0120] The power management chip receives the input power signal and generates a control signal through the internal circuit. The control signal adjusts the output voltage and current through pulse width modulation (PWM), and the control signal is transmitted to the drive module.

[0121] The driving module includes a second diode and a first MOS tube. The first MOS tube determines on and off according to the logic state of the control signal, thereby controlling the switching state of the main power switch tube. The signal output by the driving module is transmitted to the step-down conversion module, which includes multiple transformers (first, second, and third transformers).

[0122] The transformer converts the AC high voltage into multiple low-voltage AC signals, which are transmitted to the first and second output modules. The first output module includes multiple reference voltage regulator chips to generate DC power supplies of positive and negative 5V, negative 5V, positive and negative 24V, and negative 24V. The second output module generates a DC power supply of positive and negative 12V and includes a fan for heat dissipation.

[0123] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0124] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0125] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0126] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0127] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A flyback switching power supply suitable for a DCS system of a power plant, characterized in that: It includes a control module, a driving module, a step-down conversion module, a first output module, and a second output module; The output end of the control module is connected to the input end of the driving module, the output end of the driving module is connected to the input end of the buck conversion module, and the output end of the buck conversion module is connected to the first output module and the second output module respectively; The control module outputs a control signal to the driving module; The driving module is used to drive the main switch of the power supply to turn on and off; The step-down conversion module converts the AC high voltage into multiple AC low voltage signals and outputs them to the first output module and the second output module; The first output module is used to output a DC power supply of positive and negative 5V, negative 5V, positive and negative 24V, and negative 24V; The second output module is used to output a positive and negative 12V DC power supply.

2. The flyback switching power supply suitable for a DCS system of a power plant according to claim 1, characterized in that: The control module includes a power management chip; The power management chip can perform accurate duty cycle control and drive the first power MOS tube.

3. The flyback switching power supply suitable for a DCS system of a power plant according to claim 1, characterized in that: The driving module includes a second diode and a first MOS tube; The first MOS tube is used to control and adjust voltage.

4. The flyback switching power supply suitable for a DCS system of a power plant according to claim 1, characterized in that: The step-down conversion module includes a first transformer, a second transformer and a third transformer; The first transformer, the second transformer and the third transformer are used to convert high voltage alternating current into low voltage alternating current of corresponding levels.

5. The flyback switching power supply suitable for a DCS system of a power plant according to claim 1, characterized in that: The first output module includes a first reference voltage stabilizing chip; The second output module includes a second reference voltage stabilizing chip, a third reference voltage stabilizing chip, and a fan; The first reference voltage stabilizing chip, the second reference voltage stabilizing chip, and the third reference voltage stabilizing chip are used to output a fixed voltage value to ensure that the output voltage is within a rated range.

6. The flyback switching power supply suitable for a DCS system of a power plant according to claim 2, characterized in that: The pulse width modulation signal pin of the power management chip is respectively connected to one end of the forty-ninth resistor and one end of the eleventh capacitor, the other end of the forty-ninth resistor is connected to the power supply through the twenty-sixth resistor, the other end of the eleventh capacitor is connected to one end of the fifty-fourth resistor, one end of the fifty-fourth resistor is also connected to the power supply through the twenty-sixth resistor, and the other end of the fifty-fourth resistor is grounded; The current sampling input pin of the power management chip is grounded through a fifty-fourth resistor; The voltage sampling input pin of the power management chip is grounded through a seventeenth capacitor; The frequency signal output pin of the power management chip is grounded through a twenty-fifth capacitor, and the frequency signal output pin of the power management chip is also connected to the voltage sampling input pin of the power management chip through a fifty-third resistor; The negative power supply pin of the power management chip is grounded; The on / off signal input pin of the power management chip is respectively connected to one end of the twenty-sixth resistor and one end of the fifty-second resistor, the other end of the twenty-sixth resistor is grounded, and the other end of the fifty-second resistor is grounded after passing through the fifty-fifth resistor; The chip power supply positive electrode pin of the power management chip is connected to the cathode of the first diode, and the anode of the first diode is connected to the power supply through the twenty-fifth resistor.

7. The flyback switching power supply suitable for a DCS system of a power plant according to claim 3, characterized in that: The other end of the fifty-second resistor is also connected to the source of the first MOS transistor, the gate of the first MOS transistor is respectively connected to one end of the fiftieth resistor, the positive electrode of the second diode, and one end of the fifty-first resistor, the other end of the fifty-first resistor is grounded, and the negative electrode of the second diode and the other end of the fifty-first resistor are connected to the drive output signal pin of the power management chip; The drain of the first MOS tube is connected to the anode of the third diode.

8. The flyback switching power supply suitable for a DCS system of a power plant according to claim 4, characterized in that: The cathode of the first diode is also connected to the anode of the voltage zener diode, one end of the ninth capacitor, one end of the eleventh capacitor, and one end of the forty-seventh resistor, the cathode of the voltage zener diode is grounded, the other end of the ninth capacitor is grounded, and the other end of the eleventh capacitor is grounded; The other end of the forty-seventh resistor is connected to one end of the forty-eighth resistor and one end of the tenth capacitor respectively, the other end of the forty-eighth resistor and the other end of the tenth capacitor are connected to the cathode of the third diode, and the other end of the forty-seventh resistor and the rectifier power supply are connected to the anode of the third diode through the primary coil of the first transformer; The anode of the fourth diode is grounded through the primary coil of the second transformer; The cathode of the ninth diode is respectively connected to one end of the sixth capacitor, one end of the twenty-seventh capacitor, and the fan, the anode of the ninth diode is connected to the common cathode VSS through the secondary coil of the second transformer, and the other end of the sixth capacitor and the other end of the twenty-seventh capacitor are connected to the common cathode VSS; The cathode of the twelfth diode is respectively connected to one end of the thirteenth capacitor, one end of the fifteenth capacitor, and the input pin of the second reference voltage stabilizing chip, the anode of the twelfth diode is connected to the common cathode VSS through the secondary coil of the third transformer, and the other end of the thirteenth capacitor and the other end of the fifteenth capacitor are connected to the common cathode VSS.

9. The flyback switching power supply suitable for a DCS system of a power plant according to claim 5, characterized in that: The cathode of the fourth diode is respectively connected to one end of the fourteenth capacitor, the twenty-ninth capacitor, the input pin of the first reference voltage stabilizing chip, and the first output power supply, and the other end of the fourteenth capacitor and the other end of the twenty-ninth capacitor are grounded; The ground pin of the first reference voltage stabilizing chip is grounded, and the output pin of the first reference voltage stabilizing chip is respectively connected to the second output power supply, one end of the 30th capacitor, and one end of the third capacitor, and the other end of the 30th capacitor and the other end of the third capacitor are grounded.

10. The flyback switching power supply suitable for a DCS system of a power plant according to claim 5, characterized in that: The ground pin of the second reference voltage stabilizing chip is connected to the common negative electrode VSS, the output pin of the second reference voltage stabilizing chip is respectively connected to one end of the sixteenth capacitor, the third output power supply, one end of the twenty-eighth capacitor, and the input pin of the third reference voltage stabilizing chip, and the other end of the twenty-sixth capacitor, the other end of the twenty-eighth capacitor, and the ground pin of the third reference voltage stabilizing chip are connected to the common negative electrode VSS; The output pins of the third reference voltage stabilizing chip are respectively connected to the fourth output power supply, one end of the ninth capacitor, and one end of the fifteenth capacitor, and the other ends of the ninth capacitor and the fifteenth capacitor are connected to the common negative electrode VSS.

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