Flyback switching power supply suitable for DCS of power plant

Abstract

The present invention relates to a flyback switching power supply suitable for a DCS of a power plant. The flyback switching power supply suitable for a DCS of a power plant comprises a control module, a drive module, a buck conversion module, a first output module and a second output module, wherein the control module outputs a control signal to the drive module, and the drive module controls the turning-on / turning-off of a main power switching transistor; an output of the drive module is connected to the buck conversion module, which converts a high-voltage alternating current into multiple low-voltage alternating current signals and respectively transmits same to the first output module and the second output module; the first output module provides ±5 V, −5 V, ±24 V and −24 V direct current power supplies; and the second output module outputs a ±12 V direct current power supply. By means of the buck conversion module, a system converts a high-voltage alternating current into multiple low-voltage signals, thereby achieving accurate voltage and current control, and improving the power conversion efficiency and stability. The control module can adjust the output of the drive module on the basis of actual requirements, thereby further optimizing the conversion efficiency. The present invention effectively improves the performance of a power supply system and meets various power requirements.

Description

A flyback switching power supply suitable for power plant DCS systems Technical Field

[0001] This invention relates to a flyback switching power supply suitable for DCS systems in power plants, belonging to the field of industrial control technology. Background Technology

[0002] In modern power plants, the Distributed Control System (DCS) is a crucial component ensuring the safe, stable, and efficient operation of the plant. DCS systems rely on a stable and reliable power supply, and the performance of the switching power supply, as the core power supply module of the DCS system, directly affects the reliability and stability of the entire system. Traditional power plant DCS systems widely use flyback switching power supplies, which are simple in structure, low in cost, and suitable for small to medium power applications. However, as the requirements of power plants for DCS systems continue to increase, traditional flyback switching power supplies have gradually revealed the problem of large output voltage ripple in practical applications: during operation, the high-frequency switching of the switching devices easily causes fluctuations in the output voltage, i.e., large output voltage ripple. This ripple can interfere with the precision electronic equipment of the DCS system, affecting its normal operation and even leading to measurement and control errors. Technical issues

[0003] Existing technologies, such as Chinese patent publication number CN112736890A, disclose a working circuit and a DCS power supply system. The problem with this circuit is that although it includes AC / DC power conversion, the overall conversion efficiency and stability can be affected by various factors, such as the performance of the main control board and losses in the transmission circuit. The lack of a precise control mechanism may prevent the stability of output voltage and current while ensuring power conversion efficiency. Technical solutions

[0004] To address the problems existing in the prior art, this invention proposes a flyback switching power supply suitable for DCS systems in power plants.

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

[0006] This invention provides a flyback switching power supply suitable for DCS systems in power plants, including a control module, a drive module, a step-down conversion module, a first output module, and a second output module;

[0007] The output terminal of the control module is connected to the input terminal of the drive module, the output terminal of the drive module is connected to the input terminal of the step-down converter module, and the output terminal of the step-down converter module is connected to the first output module and the second output module respectively.

[0008] The control module outputs control signals to the drive module;

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

[0010] The step-down conversion module converts 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 DC power of ±5V, ±5V, ±24V, and ±24V;

[0012] The second output module is used to output a DC power supply of ±12V.

[0013] In a preferred embodiment, the control module includes a power management chip;

[0014] The power management chip can perform precise duty cycle control and drive the first power MOSFET.

[0015] In a preferred embodiment, the driving module includes a second diode and a first MOSFET;

[0016] The first MOSFET is used to control and regulate the voltage.

[0017] In a preferred embodiment, 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 AC power into low-voltage AC power of the corresponding level.

[0019] In a preferred embodiment, the first output module includes a first reference voltage regulator chip;

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

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

[0022] In a preferred embodiment, the pulse width modulation signal pin of the power management chip is 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.

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

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

[0025] The frequency signal output pin of the power management chip is grounded through the 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 the 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 connected to one end of the 26th resistor and one end of the 52nd resistor, respectively. The other end of the 26th resistor is grounded, and the other end of the 52nd resistor is grounded after passing through the 55th resistor.

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

[0029] In a preferred embodiment, the other end of the 52nd resistor is also connected to the source of the first MOS transistor, the gate of the first MOS transistor is connected to one end of the 50th resistor, the positive terminal of the second diode, and one end of the 51st resistor, respectively, the other end of the 51st resistor is grounded, and the negative terminal of the second diode and the other end of the 50th resistor are connected to the drive output signal pin of the power management chip.

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

[0031] In a preferred embodiment, the negative terminal of the first diode is also connected to the positive terminal of the Zener diode, one end of the ninth capacitor, one end of the eleventh capacitor, and one end of the forty-seventh resistor. The negative terminal of the 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 negative terminal of the third diode. The other end of the forty-seventh resistor and the rectifier power supply are connected to the positive terminal of the third diode through the primary coil of the first transformer.

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

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

[0035] The negative terminal of the twelfth diode is connected to one end of the thirteenth capacitor, one end of the fifteenth capacitor, and the input pin of the second reference voltage regulator chip. The positive terminal of the twelfth diode is connected to the common negative terminal VSS through the secondary coil of the third transformer. The other ends of the thirteenth capacitor and the fifteenth capacitor are connected to the common negative terminal VSS.

[0036] In a preferred embodiment, the negative terminal of the fourth diode is 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, respectively, while 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 regulator chip is grounded, and the output pin of the first reference voltage regulator chip is connected to the second output power supply, one end of the thirtieth capacitor, and one end of the third capacitor, respectively. The other ends of the thirtieth capacitor and the other ends of the third capacitor are grounded.

[0038] In a preferred embodiment, the ground pin of the second reference voltage regulator chip is connected to the common negative terminal VSS, the output pin of the second reference voltage regulator chip is 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 regulator chip, respectively, 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 regulator chip are connected to the common negative terminal VSS.

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

[0040] This invention fills a market gap, enabling flexible integration into commonly used DCS control systems in my country, providing them with the same functionality as the original brand power supplies. This alleviates the current situation where our spare parts procurement is dependent on foreign manufacturers. Based on the design characteristics of power modules in the distributed control systems of commonly imported brands used in Chinese power plants, this invention designs a flyback switching power supply that provides multiple power outputs and whose power parameters are consistent with most brands. This invention uses conventional terminal block outputs; users only need to remove the original power supply's connector and connect it to the corresponding output terminal for direct replacement. Compared to imported brands, which are expensive, have long procurement cycles, and are technologically monopolistic, this power supply is priced at one-tenth of imported brands. Manufacturing is simple and easy, allowing for mass production and readily available stock. This invention uses a step-down conversion module to convert high-voltage AC into multiple low-voltage AC signals, which are then output to the first and second output modules. This design allows for precise control of output voltage and current, thereby improving power conversion efficiency and stability. Simultaneously, the control module can adjust the output of the drive module according to actual needs, further optimizing power conversion efficiency. Attached Figure Description

[0041] Figure 1 is a diagram showing the module connections of the present invention.

[0042] Figure 2 is a circuit connection topology diagram of the present invention.

[0043] Figure 3 is a detailed diagram of the control module of the present invention.

[0044] Figure 4 is a detailed view of the driving module of the present invention.

[0045] Figure 5 is a detailed diagram of the step-down converter module of the present invention.

[0046] Figure 6 is a detailed view of the first output module of the present invention.

[0047] Figure 7 is a detailed view of the second output module of the present invention. Embodiments of the present invention

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0050] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0051] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0052] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0053] Example 1:

[0054] In this embodiment, the first diode is D1 as shown in Figure 2, the second diode is D2 as shown in Figure 2, the third diode is D3 as shown in Figure 2, the fourth diode is D4 as shown in Figure 2, the ninth diode is D9 as shown in Figure 2, the twelfth diode is D12 as shown in Figure 2, and the Zener diode is DW as shown in Figure 2.

[0055] The power management chip is UC1, labeled in Figure 2, and its model is UC3845;

[0056] The first reference voltage regulator chip is JZ1 as shown in Figure 2;

[0057] The second reference voltage regulator chip is JZ2 as shown in Figure 2;

[0058] The third reference voltage regulator chip is JZ3 as shown in Figure 2;

[0059] The rectified power supply is DC as shown in Figure 2;

[0060] The first MOS transistor is Q18, marked in Figure 2, which is a CMOS transistor;

[0061] The first output power supply is VV1 (12V output power supply) as shown in Figure 2.

[0062] The second output power supply is VV2 (12V output power supply) marked in Figure 2.

[0063] The third output power supply is VV3 (output 24V power supply) marked in Figure 2.

[0064] The fourth output power supply is VV4 (5V output power supply) marked in Figure 2.

[0065] The fan is the FAN marked in Figure 2;

[0066] The pulse width modulation signal pin of the power management chip is pin 1 of the UC1 chip as shown in Figure 2.

[0067] The current sampling input pin of the power management chip is pin 2 of the UC1 chip as shown in Figure 2.

[0068] The on / off signal input pin of the power management chip is pin 3 of the UC1 chip as shown in Figure 2.

[0069] The voltage sampling input pin of the power management chip is pin 4 of the UC1 chip as shown in Figure 2.

[0070] The negative power supply pin of the power management chip is pin 5 of the UC1 chip as shown in Figure 2.

[0071] The drive output signal pin of the power management chip is pin 6 of the UC1 chip as shown in Figure 2.

[0072] The positive power supply pin of the power management chip is pin 7 of the UC1 chip as shown in Figure 2.

[0073] The frequency signal output pin of the power management chip is pin 8 of the UC1 chip as shown in Figure 2.

[0074] The first transformer is B1 as shown in Figure 2 (the primary coil is on the left and the secondary coil is on the right).

[0075] The second transformer is labeled B2 in Figure 2;

[0076] The third transformer is labeled B3 in Figure 2;

[0077] The fifty-fourth resistor is R54 as shown in Figure 2, the forty-ninth resistor is R49 as shown in Figure 2, the twenty-sixth resistor is R26 as shown in Figure 2, the twenty-fifth resistor is R25 as shown in Figure 2, the fifty-third resistor is R53 as shown in Figure 2, the forty-seventh resistor is R47 as shown in Figure 2, the forty-eighth resistor is R48 as shown in Figure 2, the fifty-first resistor is R51 as shown in Figure 2, the fifty-second resistor is R52 as shown in Figure 2, the fiftieth resistor is R50 as shown in Figure 2, and the fifty-fifth resistor is R55 as shown in Figure 2.

[0078] The seventeenth capacitor is C17 as shown in Figure 2, the twenty-fifth capacitor is C25 as shown in Figure 2, the eleventh capacitor is C11 as shown in Figure 2, the ninth capacitor is C9 as shown in Figure 2, the tenth capacitor is C10 as shown in Figure 2, the fifteenth capacitor is C15 as shown in Figure 2, the twenty-eighth capacitor is C28 as shown in Figure 2, the thirteenth capacitor is C13 as shown in Figure 2, the twenty-seventh capacitor is C27 as shown in Figure 2, the thirtieth capacitor is C30 as shown in Figure 2, the twenty-ninth capacitor is C29 as shown in Figure 2, and the twenty-seventh capacitor is C26 as shown in Figure 2.

[0079] The eleventh capacitor is E11, an electrolytic capacitor, as shown in Figure 2; the third capacitor is E3, an electrolytic capacitor, as shown in Figure 2; the fourteenth capacitor is E14, an electrolytic capacitor, as shown in Figure 2; the ninth capacitor is E9, an electrolytic capacitor, as shown in Figure 2; the sixteenth capacitor is E16, an electrolytic capacitor, as shown in Figure 2; the fifteenth capacitor is E15, an electrolytic capacitor, as shown in Figure 2; and the sixth capacitor is E6, an electrolytic capacitor, as shown in Figure 2.

[0080] Referring to Figures 1-2, the present invention provides a flyback switching power supply suitable for DCS systems in power plants, including a control module, a drive module, a step-down conversion module, a first output module, and a second output module;

[0081] The output terminal of the control module is connected to the input terminal of the drive module, the output terminal of the drive module is connected to the input terminal of the step-down converter module, and the output terminal of the step-down converter module is connected to the first output module and the second output module respectively.

[0082] The control module outputs control signals to the drive module;

[0083] The drive module is used to drive the power supply main switch transistor to turn on and off;

[0084] The step-down conversion module converts AC high voltage into multiple AC low voltage signals and outputs them to the first output module and the second output module;

[0085] The first output module is used to output DC power of ±5V, ±5V, ±24V, and ±24V;

[0086] The second output module is used to output a DC power supply of ±12V.

[0087] In a preferred embodiment, the control module includes a power management chip;

[0088] The power management chip can perform precise duty cycle control and drive the first power MOSFET.

[0089] In a preferred embodiment, the driving module includes a second diode and a first MOSFET;

[0090] The first MOSFET is used to control and regulate the voltage.

[0091] In a preferred embodiment, the step-down conversion module includes a first transformer, a second transformer, and a third transformer;

[0092] The first transformer, the second transformer, and the third transformer are used to convert high-voltage AC power into low-voltage AC power of the corresponding level.

[0093] In a preferred embodiment, the first output module includes a first reference voltage regulator chip;

[0094] The second output module includes a second reference voltage regulator chip, a third reference voltage regulator chip, and a fan;

[0095] The first, second, and third reference voltage regulator chips are used to output a fixed voltage value, ensuring that the output voltage is within the rated range.

[0096] Referring to Figure 3, in a preferred embodiment, the pulse width modulation signal pin of the power management chip is connected to one end of the forty-ninth resistor and one end of the eleventh capacitor, respectively. 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. The other end of the fifty-fourth resistor is grounded.

[0097] The current sampling input pin of the power management chip is grounded through the fifty-fourth resistor;

[0098] The voltage sampling input pin of the power management chip is grounded through the seventeenth capacitor;

[0099] The frequency signal output pin of the power management chip is grounded through the 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 the fifty-third resistor.

[0100] The negative power supply pin of the power management chip is grounded;

[0101] The on / off signal input pin of the power management chip is connected to one end of the 26th resistor and one end of the 52nd resistor, respectively. The other end of the 26th resistor is grounded, and the other end of the 52nd resistor is grounded after passing through the 55th resistor.

[0102] The positive power supply pin of the power management chip is connected to the negative terminal of the first diode, and the positive terminal of the first diode is connected to the power supply through the twenty-fifth resistor.

[0103] The power management chip enables precise control of the entire power system, including voltage regulation, current monitoring, and fault protection, improving overall system efficiency and stability. The chip can adjust the duty cycle and frequency of the PWM signal in real time according to load demands, thereby optimizing power output and reducing energy waste. Through current and voltage sampling, the control module can promptly detect and handle abnormal conditions in the power system, such as overcurrent and overvoltage, protecting the system from damage.

[0104] Referring to Figure 4, in a preferred embodiment, 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 connected to one end of the fiftyth resistor, the positive terminal of the second diode, and one end of the fifty-first resistor, respectively. The other end of the fifty-first resistor is grounded. The negative terminal of the second diode and the other end of the fiftyth resistor are connected to the drive output signal pin of the power management chip.

[0105] The drain of the first MOSFET is connected to the anode of the third diode.

[0106] Through current and voltage sampling, the control module can promptly detect and handle abnormal conditions in the power supply system, such as overcurrent and overvoltage, protecting the system from damage. MOSFETs have low on-resistance when turned on, reducing energy loss and improving the overall efficiency of the power supply system.

[0107] Referring to Figure 5, in a preferred embodiment, the negative terminal of the first diode is also connected to the positive terminal of the Zener diode, one end of the ninth capacitor, one end of the eleventh capacitor, and one end of the forty-seventh resistor. The negative terminal of the Zener diode is grounded, the other end of the ninth capacitor is grounded, and the other end of the eleventh capacitor is grounded.

[0108] 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 negative terminal of the third diode. The other end of the forty-seventh resistor and the rectifier power supply are connected to the positive terminal of the third diode through the primary coil of the first transformer.

[0109] The positive terminal of the fourth diode is grounded through the primary coil of the second transformer;

[0110] The negative terminal of the ninth diode is connected to one end of the sixth capacitor, one end of the twenty-seventh capacitor, and the fan, respectively. The positive terminal of the ninth diode is connected to the common negative terminal VSS through the secondary coil of the second transformer. The other end of the sixth capacitor and the other end of the twenty-seventh capacitor are connected to the common negative terminal VSS.

[0111] The negative terminal of the twelfth diode is connected to one end of the thirteenth capacitor, one end of the fifteenth capacitor, and the input pin of the second reference voltage regulator chip. The positive terminal of the twelfth diode is connected to the common negative terminal VSS through the secondary coil of the third transformer. The other ends of the thirteenth capacitor and the fifteenth capacitor are connected to the common negative terminal VSS.

[0112] By using different turns ratios in the transformer, the step-down converter module can transform the input high-voltage AC into low-voltage outputs of various levels to meet the voltage requirements of different load devices. The transformer provides electrical isolation between the input and output, preventing faults on the high-voltage side from affecting the low-voltage side and improving system safety.

[0113] Referring to Figure 6, in a preferred embodiment, the negative terminal of the fourth diode is 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, respectively, while the other end of the fourteenth capacitor and the other end of the twenty-ninth capacitor are grounded.

[0114] The ground pin of the first reference voltage regulator chip is grounded, and the output pin of the first reference voltage regulator chip is connected to the second output power supply, one end of the thirtieth capacitor, and one end of the third capacitor, respectively. The other ends of the thirtieth capacitor and the other ends of the third capacitor are grounded.

[0115] Referring to Figure 7, in a preferred embodiment, the ground pin of the second reference voltage regulator chip is connected to the common negative terminal VSS, the output pin of the second reference voltage regulator chip is 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 regulator chip, respectively, 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 regulator chip are connected to the common negative terminal VSS.

[0116] The output pins of the third reference voltage regulator chip are connected to the fourth output power supply, one end of the ninth capacitor, and one end of the fifteenth capacitor, respectively. The other ends of the ninth capacitor and the fifteenth capacitor are connected to the common negative terminal VSS.

[0117] The reference voltage regulator chip ensures the stability and accuracy of the output voltage, maintaining a constant output voltage even under load changes or input voltage fluctuations. The first and second output modules provide DC power outputs at multiple voltage levels to meet the voltage requirements of different load devices, improving the flexibility and adaptability of the power supply system. The second output module is equipped with a fan and other heat dissipation devices to dissipate heat generated by the power supply system in a timely manner, preventing overheating that could lead to malfunctions or performance degradation.

[0118] Example 2:

[0119] The power management chip receives the input power signal, generates a control signal through its internal circuitry, and adjusts the output voltage and current using pulse width modulation (PWM). The control signal is then transmitted to the drive module.

[0120] The drive module includes a second diode and a first MOSFET. The first MOSFET determines whether to turn on or off according to the logic state of the control signal, thereby controlling the switching state of the main power switch. The signal output by the drive module is transmitted to the step-down conversion module, which includes multiple transformers (first, second, and third transformers).

[0121] The transformer converts high-voltage AC into multiple low-voltage AC signals, which are then transmitted to the first and second output modules. The first output module contains multiple reference voltage regulator chips that generate DC power supplies of ±5V, ±5V, ±24V, and ±24V. The second output module generates a DC power supply of ±12V and includes a fan for heat dissipation.

[0122] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related 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 singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0123] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0124] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0125] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0126] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A flyback switching power supply suitable for DCS systems in power plants, characterized in that, It includes a control module, a drive module, a step-down converter module, a first output module, and a second output module; The output terminal of the control module is connected to the input terminal of the drive module, the output terminal of the drive module is connected to the input terminal of the step-down converter module, and the output terminal of the step-down converter module is connected to the first output module and the second output module respectively. The control module outputs control signals to the drive module; The drive module is used to drive the power supply main switch transistor to turn on and off; The step-down conversion module converts 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 DC power of ±5V, ±5V, ±24V, and ±24V; The second output module is used to output a DC power supply of ±12V.

2. The flyback switching power supply for power plant DCS systems according to claim 1, characterized in that, The control module includes a power management chip; The power management chip can perform precise duty cycle control and drive the first power MOSFET.

3. The flyback switching power supply for power plant DCS systems according to claim 1, characterized in that, The driving module includes a second diode and a first MOSFET; The first MOSFET is used to control and regulate the voltage.

4. The flyback switching power supply for power plant DCS systems 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 AC power into low-voltage AC power of the corresponding level.

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

6. The flyback switching power supply for power plant DCS systems according to claim 2, characterized in that, The pulse width modulation signal pin of the power management chip is connected to one end of the forty-ninth resistor and one end of the eleventh capacitor respectively. 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. The other end of the fifty-fourth resistor is grounded. The current sampling input pin of the power management chip is grounded through the fifty-fourth resistor; The voltage sampling input pin of the power management chip is grounded through the seventeenth capacitor; The frequency signal output pin of the power management chip is grounded through the 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 the 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 connected to one end of the 26th resistor and one end of the 52nd resistor, respectively. The other end of the 26th resistor is grounded, and the other end of the 52nd resistor is grounded after passing through the 55th resistor. The positive power supply pin of the power management chip is connected to the negative terminal of the first diode, and the positive terminal of the first diode is connected to the power supply through the twenty-fifth resistor.

7. The flyback switching power supply for power plant DCS systems according to claim 6, 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 connected to one end of the fiftyth resistor, the positive terminal of the second diode, and one end of the fifty-first resistor. The other end of the fifty-first resistor is grounded. The negative terminal of the second diode and the other end of the fiftyth resistor are connected to the drive output signal pin of the power management chip. The drain of the first MOSFET is connected to the anode of the third diode.

8. The flyback switching power supply for power plant DCS systems according to claim 6, characterized in that, The negative terminal of the first diode is also connected to the positive terminal of the Zener diode, one end of the ninth capacitor, one end of the eleventh capacitor, and one end of the forty-seventh resistor. The negative terminal of the 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 negative terminal of the third diode. The other end of the forty-seventh resistor and the rectifier power supply are connected to the positive terminal of the third diode through the primary coil of the first transformer. The positive terminal of the fourth diode is grounded through the primary coil of the second transformer; The negative terminal of the ninth diode is connected to one end of the sixth capacitor, one end of the twenty-seventh capacitor, and the fan, respectively. The positive terminal of the ninth diode is connected to the common negative terminal VSS through the secondary coil of the second transformer. The other end of the sixth capacitor and the other end of the twenty-seventh capacitor are connected to the common negative terminal VSS. The negative terminal of the twelfth diode is connected to one end of the thirteenth capacitor, one end of the fifteenth capacitor, and the input pin of the second reference voltage regulator chip. The positive terminal of the twelfth diode is connected to the common negative terminal VSS through the secondary coil of the third transformer. The other ends of the thirteenth capacitor and the fifteenth capacitor are connected to the common negative terminal VSS.

9. The flyback switching power supply for power plant DCS systems according to claim 8, characterized in that, The negative terminal of the fourth diode is 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, respectively. 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 regulator chip is grounded, and the output pin of the first reference voltage regulator chip is connected to the second output power supply, one end of the thirtieth capacitor, and one end of the third capacitor, respectively. The other ends of the thirtieth capacitor and the other ends of the third capacitor are grounded.

10. The flyback switching power supply for a power plant DCS system according to claim 5, characterized in that, The ground pin of the second reference voltage regulator chip is connected to the common negative terminal VSS. The output pin of the second reference voltage regulator chip is 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 regulator chip, respectively. 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 regulator chip are connected to the common negative terminal VSS. The output pins of the third reference voltage regulator chip are connected to the fourth output power supply, one end of the ninth capacitor, and one end of the fifteenth capacitor, respectively. The other ends of the ninth capacitor and the fifteenth capacitor are connected to the common negative terminal VSS.

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