Marine DC 24V output control system

Abstract

The utility model relates to a marine direct current 24V output control system, which comprises a three-phase power receiving unit, a transformer and a plurality of control units connected in parallel, the three-phase power receiving unit is used for receiving 380V alternating current and transmitting the 380V alternating current to the transformer, the transformer is used for converting the 380V alternating current into 24V alternating current, and the 24V alternating current is transmitted to the control units. And the control unit is used for converting the 24V alternating current into 24V direct current and outputting the 24V direct current. According to the utility model, through receiving and converting three-phase power, reducing voltage, converting AC to DC and designing a parallel structure, a stable and reliable 24V DC power supply is provided for DC electric equipment of a ship so as to meet various requirements of a ship electric power system.

Description

Technical Field

[0001] The utility model relates to the technical field of ship direct current control, in particular to a ship direct current 24V output control system. Background Art

[0002] At present, the power supply requirement in metal enclosed cabins cannot exceed 24V. The existing technology generally uses the main coil and secondary coil winding to convert to AC24V, or uses the AC24V to be directly used after simple rectification and filtering with a rectifier bridge and filter capacitor. However, the above two methods cannot achieve a stable 24V output. The voltage fluctuations under light load and heavy load are large, and the stable use and reliability of the equipment cannot be guaranteed. The key point is that the maximum output voltage of these two methods can reach 34V (24V*1.414), which does not meet the requirements. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a marine direct current 24V output control system.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A marine 24V DC output control system comprises: a three-phase power receiving unit, a transformer and a plurality of control units connected in parallel, wherein the three-phase power receiving unit is used to receive 380V AC power and transmit it to the transformer, the transformer is used to convert the 380V AC power into 24V AC power and transmit it to the control unit, and the control unit is used to convert the 24V AC power into 24V DC power and output it.

[0006] In a specific embodiment, the control unit includes a rectifier module, a soft start switch module, a main control module, a voltage stabilizing module and an output module. The rectifier module is used to receive the 24V AC power transmitted from the transformer and convert it into unstable DC power. The soft start switch module is electrically connected to the rectifier module and the main control module. The voltage stabilizing module is electrically connected to the soft start switch module and is used to convert the unstable DC power into stable 24V DC power. The output module is electrically connected to the voltage stabilizing module and is used to output 24V DC power.

[0007] In a specific embodiment, the rectifier module includes a rectifier bridge U6 , one end of the rectifier bridge U6 is connected to the transformer, and the other end of the rectifier bridge U6 is connected to the soft start switch module.

[0008] In a specific embodiment, the soft start switch module includes a MOS tube Q1, a resistor R1, a resistor R2, a resistor R3, a MOS tube Q2, a resistor R5, a filter capacitor C1, a resistor R6, a MOS tube Q3, a resistor R7, a MOS tube Q4 and a resistor R9. The MOS tube Q1, the resistor R1 and the resistor R2 are connected to the rectifier bridge U6. The MOS tube Q1 and the resistor R2 are also connected to the resistor R3. One end of the MOS tube Q2 is connected to the resistor R3, and the other end is connected to the resistor R5. The resistor R5 is connected to the main control module. The filter capacitor C1 is connected to the resistor R1, the MOS tube Q1, the resistor R6, the MOS tube Q3 and the main control module. The resistor R6 and the MOS tube Q3 are also connected to the resistor R7. One end of the MOS tube Q4 is connected to the resistor R7, and the other end is connected to the resistor R9. The resistor R9 is connected to the main control module.

[0009] In a specific embodiment, the main control module includes a single-chip microcomputer U3, pin 8 of the single-chip microcomputer U3 is connected to the resistor R5, and pin 7 of the single-chip microcomputer U3 is connected to the resistor R9.

[0010] In a specific embodiment, the control unit also includes a single-chip microcomputer power supply module, which includes a resistor R64, a voltage-stabilizing diode ZD6 and a power supply chip U12. One end of the resistor R64 is connected to the filter capacitor C1, and the other end is connected to the voltage-stabilizing diode ZD6. One end of the power supply chip U12 is connected to the voltage-stabilizing diode ZD6, and the other end is connected to pin 10 of the single-chip microcomputer U3.

[0011] In a specific embodiment, the voltage stabilizing module includes a voltage stabilizing chip U1, a resistor R28, a capacitor C31, a resistor R37, a resistor R38, a resistor R39 and a resistor R40. One end of the resistor R28 is connected to the MOS tube Q3, and the other end is connected to pin 2 of the voltage stabilizing chip U1. Pin 8 of the voltage stabilizing chip U1 is connected to the capacitor C31, the resistor R37, the resistor R38 and the resistor R40. The resistor R39 is connected to the capacitor C31. The resistor R37, the resistor R39 and the pins 10 and 16 of the voltage stabilizing chip U1 are connected to the output module.

[0012] In a specific embodiment, the output module includes a MOS tube U7, a MOS tube U8, an inductor L1, a capacitor C18, a capacitor C19, a capacitor C22 and an output end, pin 10 of the voltage stabilizing chip U1 is connected to the MOS tube U8, pin 16 of the voltage stabilizing chip U1 is connected to the MOS tube U7, the MOS tube U7 and the MOS tube U8 are also connected to the inductor L1, and the capacitor C18, capacitor C19, capacitor C22 and the output end are connected to the inductor L1.

[0013] In a specific embodiment, the control unit also includes a current limiting and high temperature protection module, which includes an operational amplifier U2 and a thermistor R55. The operational amplifier U2 is connected to pin 7 of the voltage regulator chip U1, and the thermistor R55 is connected to pin 6 of the operational amplifier U2.

[0014] In a specific embodiment, the control unit also includes a temperature sampling module, which includes a temperature sensor NTC, a resistor R70, a temperature sensor NTC1 and a resistor R68, one end of the resistor R70 is connected to pin 11 of the microcontroller U3, and the other end is connected to the temperature sensor NTC, one end of the resistor R68 is connected to pin 14 of the microcontroller U3, and the other end is connected to the temperature sensor NTC1.

[0015] Compared with the prior art, the utility model has the following beneficial effects: by receiving and converting three-phase electricity, reducing voltage, converting AC to DC and designing a parallel structure, a stable and reliable 24V DC power supply is provided for the DC power equipment of the ship to meet various needs of the ship's power system.

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic block diagram of a marine 24V DC output control system provided by the utility model;

[0019] Figure 2 This is a schematic diagram of the electrical principle of the marine DC 24V output control system provided by the utility model;

[0020] Figure 3 A schematic block diagram of a control unit provided by the utility model;

[0021] Figure 4 A circuit diagram of a rectifier module, a soft start switch module and a single chip microcomputer power supply module provided by the utility model;

[0022] Figure 5 A circuit diagram of the main control module provided by the utility model;

[0023] Figure 6A circuit diagram of a voltage stabilizing module, an output module, and a current limiting and high temperature protection module provided by the utility model;

[0024] Figure 7 A circuit diagram of a temperature sampling module provided by the utility model;

[0025] Figure 8 A circuit diagram of a fan module provided by the utility model;

[0026] Fig. 9 A circuit diagram of a voltage-stabilized power supply module provided by the utility model;

[0027] Fig.10 This is a circuit diagram of the soft-start voltage sampling module provided by the utility model. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0035] See also Figure 1 , Figure 1 A schematic block diagram of a marine 24V DC output control system provided for an embodiment of the utility model includes: a three-phase power receiving unit 10, a transformer 20 and a plurality of control units 30 connected in parallel, wherein the three-phase power receiving unit 10 is used to receive 380V AC power and transmit it to the transformer 20, wherein the transformer 20 is used to convert the 380V AC power into 24V AC power and transmit it to the control unit 30, wherein the control unit 30 is used to convert the 24V AC power into 24V DC power and output it.

[0036] Specifically, the three-phase power receiving unit 10 is an aviation socket, which is responsible for receiving 380V alternating current. Since the three-phase power has three phases of current, it can improve the power transmission efficiency and the stability of the power system. In addition, the transformer 20 is a single-phase safety isolation transformer, whose primary coil and secondary coil are separate coils, and the AC380V high voltage and AC24V low voltage are completely isolated in the structural space to ensure safety and reliability. In addition, the primary coil and the secondary coil share a magnetic core, which improves the conversion efficiency.

[0037] Specifically, the marine DC 24V output control system provides a stable and reliable 24V DC power supply for the ship's DC power equipment by receiving and converting three-phase electricity, reducing voltage, converting AC to DC, and designing a parallel structure to meet various needs of the ship's power system.

[0038] See also Figure 2 As shown, the control system is also equipped with surge protection to effectively prevent lightning strikes. In addition, the number of control units 30 is 8, which are used to provide stable and reliable DC24V voltage output within the rated power (1000W), ensuring that the equipment can be used stably and reliably, and reliably protecting the safety of equipment users.

[0039] See also Figure 3 As shown, the control unit 30 includes a rectifier module 31, a soft start switch module 32, a main control module 33, a voltage stabilizing module 34 and an output module 35. The rectifier module 31 is used to receive the 24V AC power transmitted from the transformer 20 and convert it into unstable DC power. The soft start switch module 32 is electrically connected to the rectifier module 31 and the main control module 33. The voltage stabilizing module 34 is electrically connected to the soft start switch module 32 and is used to convert the unstable DC power into a stable 24V DC power. The output module 35 is electrically connected to the voltage stabilizing module 34 and is used to output 24V DC power.

[0040] Specifically, the control unit 30 is used to receive 24V AC power from the transformer 20 and convert it into a stable 24V DC power output. Starting from receiving the AC power output by the transformer 20, it goes through operations such as rectification, soft start, voltage stabilization and output, and finally provides high-quality power supply for equipment or systems that require stable DC power; in addition, the soft start of the control unit 30 can effectively avoid the switch sparking phenomenon caused by instantaneous large current at the input end, thereby ensuring the reliability of the switch and the line; in addition, through the combination of the above modules, this technology not only ensures the stability and safety of the power supply, but also improves the efficiency and reliability of the power supply system. In various applications, such as industrial control, energy and power fields, electronic products, etc., this technology can play an important role to ensure the normal operation of equipment or systems.

[0041] See also Figure 4As shown, the rectifier module 31 includes a rectifier bridge U6 , one end of the rectifier bridge U6 is connected to the transformer 20 , and the other end is connected to the soft start switch module 32 .

[0042] Specifically, the rectifier bridge U6 is a high-power rectifier bridge stack, and its model is MDQ150A. The main function of the rectifier bridge U6 is to convert the 24V alternating current (AC) output by the transformer 20 into direct current (DC). The rectifier bridge usually includes four diodes or thyristors, and adopts a specific circuit connection method to ensure that current passes through the positive and negative half cycles of the alternating current, thereby obtaining unidirectional direct current. In addition, one end of the rectifier bridge U6 is connected to the transformer 20 to receive the 24V alternating current output by the transformer 20, and the other end is connected to the soft start switch module 32 to pass the rectified direct current to the subsequent circuit module. This connection process ensures the continuity and stability of power transmission. In addition, the rectifier bridge U6 reduces the energy loss in the power transmission process and improves the power transmission efficiency through its rectification effect. At the same time, the rectified direct current is more conducive to subsequent circuit control and utilization. In addition, the rectifier bridge U6 plays a role of electrical isolation in the circuit, preventing the potential damage of AC power to subsequent circuit modules. In addition, the diodes or thyristors in the rectifier bridge also have certain over-current and over-voltage protection capabilities to ensure the safe operation of the circuit.

[0043] See also Figure 4 As shown, the soft start switch module 32 includes a MOS tube Q1, a resistor R1, a resistor R2, a resistor R3, a MOS tube Q2, a resistor R5, a filter capacitor C1, a resistor R6, a MOS tube Q3, a resistor R7, a MOS tube Q4 and a resistor R9. The MOS tube Q1, the resistor R1 and the resistor R2 are connected to the rectifier bridge U6. The MOS tube Q1 and the resistor R2 are also connected to the resistor R3. One end of the MOS tube Q2 is connected to the resistor R3, and the other end is connected to the resistor R5. The resistor R5 is connected to the main control module 33. The filter capacitor C1 is connected to the resistor R1, the MOS tube Q1, the resistor R6, the MOS tube Q3 and the main control module 33. The resistor R6 and the MOS tube Q3 are also connected to the resistor R7. One end of the MOS tube Q4 is connected to the resistor R7, and the other end is connected to the resistor R9. The resistor R9 is connected to the main control module 33.

[0044] Specifically, the soft start switch module 32 also includes a capacitor C27 and a capacitor C43, one end of the capacitor C27 and the capacitor C43 is connected to the rectifier bridge U6, and the other end is grounded for filtering high frequency. The resistor R1 is a charging resistor, and the MOS tube Q1, the resistor R2, the resistor R3, the MOS tube Q2 and the resistor R5 and the MOS tube Q3, the resistor R6, the resistor R7, the MOS tube Q4 and the resistor R9 form two soft start switches controlled by the main control module 33. When the circuit starts to be powered on, the soft start switch is closed, and the direct current from the rectifier bridge U6 first charges the filter capacitor C1 through the resistor R1. When the main control module 33 detects that the filter capacitor C1 is fully charged through the soft start voltage point sampling module 321, the main control module 33 controls the two soft start switches to turn on and power the voltage stabilizing module 34.

[0045] See also Figure 5 As shown, the main control module 33 includes a single-chip microcomputer U3, pin 8 of the single-chip microcomputer U3 is connected to the resistor R5, and pin 7 of the single-chip microcomputer U3 is connected to the resistor R9.

[0046] Specifically, the single-chip microcomputer U3 is the core of the main control module, and its model is EM78P372N. Through the 8th and 7th pins of the single-chip microcomputer U3, the control signals are output, and the two control signals are connected to the resistors R5 and R9 respectively, so as to realize the control of the MOS tube in the soft start switch module 32, realize the precise control of the soft start switch module 32, realize the soft start and protection function of the equipment, and improve the stability and reliability of the circuit. In addition, by controlling the conduction angle (or duty cycle) of the MOS tube, the single-chip microcomputer U3 can realize the precise control of the output voltage. In the equipment startup phase, the single-chip microcomputer U3 can gradually increase the output voltage to realize soft start, thereby avoiding the impact on the equipment and the power grid. In addition, the single-chip microcomputer U3 can also judge whether the circuit is abnormal, such as overcurrent, overvoltage, etc., according to the feedback signal. Once an abnormal situation is detected, the single-chip microcomputer U3 will quickly adjust the control signal, or even turn off the output, to protect the circuit and the equipment from damage. In addition, since the single-chip microcomputer U3 is programmable, users can write control programs according to specific needs to implement different control strategies and functions, which makes the entire control system highly scalable and flexible.

[0047] See also Figure 4 As shown, the control unit 30 also includes a single-chip microcomputer power supply module 36, and the single-chip microcomputer power supply module 36 includes a resistor R64, a voltage-stabilizing diode ZD6 and a power supply chip U12. One end of the resistor R64 is connected to the filter capacitor C1, and the other end is connected to the voltage-stabilizing diode ZD6. One end of the power supply chip U12 is connected to the voltage-stabilizing diode ZD6, and the other end is connected to pin 10 of the single-chip microcomputer U3.

[0048] Specifically, the single-chip microcomputer U3 has very high requirements for the stability of the power supply, because an unstable power supply may cause it to work abnormally or be damaged. The single-chip microcomputer power supply module 36 realizes the stabilization of the input power supply through the combination of the resistor R64, the voltage-stabilizing diode ZD6 and the power supply chip U12. In addition, the resistor R64 and the filter capacitor C1 are usually used together for power supply filtering to eliminate high-frequency noise and stray signals in the input power supply, and provide a relatively clean power supply environment for the single-chip microcomputer U3. The voltage-stabilizing diode ZD6 is a key component in the module. Its main function is to stabilize the voltage. When the input voltage fluctuates, the voltage-stabilizing diode ZD6 can keep the voltage at both ends relatively stable, thereby protecting the subsequent circuit from the influence of voltage fluctuations. The power supply chip U12 is usually an integrated circuit with voltage stabilization and power management functions. It receives the stable voltage from the voltage-stabilizing diode ZD6 and converts it into the specific voltage and current required by the single-chip microcomputer U3. The output of the power supply chip U12 is connected to the 10th foot of the single-chip microcomputer U3 to provide it with a stable and reliable power supply.

[0049] See also Figure 6 As shown, the voltage stabilizing module 34 includes a voltage stabilizing chip U1, a resistor R28, a capacitor C31, a resistor R37, a resistor R38, a resistor R39 and a resistor R40. One end of the resistor R28 is connected to the MOS tube Q3, and the other end is connected to the 2nd pin of the voltage stabilizing chip U1. The 8th pin of the voltage stabilizing chip U1 is connected to the capacitor C31, the resistor R37, the resistor R38 and the resistor R40. The resistor R39 is connected to the capacitor C31. The resistor R37, the resistor R39 and the 10th and 16th pins of the voltage stabilizing chip U1 are connected to the output module 35.

[0050] Specifically, the voltage stabilizing chip U1 is a DC\DC synchronous rectifier buck chip, and its model is TL594. The output module 35 is controlled to output a stable voltage through the 10th and 16th pins of the voltage stabilizing chip U1. The capacitor C31, the resistor R37, the resistor R38, the resistor R39 and the resistor R40 are used to set the output voltage. In addition, the voltage stabilizing chip U1 is the core of the voltage stabilizing module 34. It can stabilize the input voltage and output a stable voltage, which ensures that the electronic components connected to the output module 35 can work normally under a constant voltage to avoid performance degradation or damage caused by voltage fluctuations. The resistor R28 is connected between the MOS tube Q3 and the 2nd pin of the voltage stabilizing chip U1. Its function is to limit current, divide voltage or provide feedback signals to the voltage stabilizing chip U1 to adjust the stability of the output voltage.

[0051] See also Figure 6As shown, the output module 35 includes a MOS tube U7, a MOS tube U8, an inductor L1, a capacitor C18, a capacitor C19, a capacitor C22 and an output end, the 10th pin of the voltage stabilizing chip U1 is connected to the MOS tube U8, the 16th pin of the voltage stabilizing chip U1 is connected to the MOS tube U7, the MOS tube U7 and the MOS tube U8 are also connected to the inductor L1, and the capacitor C18, the capacitor C19, the capacitor C22 and the output end are connected to the inductor L1.

[0052] Specifically, pins 10 and 16 of the voltage regulator chip U1 generate complementary PWM signals with dead time control. This design ensures the precise control of MOS tube U7 (high-end MOS tube) and MOS tube U8 (synchronous rectification MOS tube), avoids the situation of simultaneous conduction, effectively reduces power consumption and improves system efficiency. The PWM signal drives the conduction and shutdown of MOS tube U7 and MOS tube U8 respectively, and can adjust the output voltage and current in real time according to load changes and system requirements; in addition, the inductor L1 acts as an energy storage inductor, which stores and releases energy during the conduction and shutdown of MOS tube U7 and MOS tube U8, effectively smoothes the output voltage, and reduces ripple and noise. Capacitors C18, C19, and C22 are used as output capacitors and together with inductor L1 form an LC filter circuit to further filter out high-frequency noise and clutter in the output voltage and improve the stability and purity of the output voltage. In addition, a synchronous rectifier MOS tube U8 is used to replace the traditional diode for rectification, which effectively reduces the power consumption during the rectification process and improves the overall efficiency. The MOS tube U8 is turned on when the MOS tube U7 is turned off, and the low on-resistance characteristic of the MOS tube is used to reduce energy loss. Resistor R43 is used as an output current sampling resistor to monitor the output current in real time. When the output current exceeds the preset value, protection can be performed to avoid equipment damage or safety accidents.

[0053] See also Figure 6 As shown, the control unit 30 also includes a current limiting and high temperature protection module 37, which includes an operational amplifier U2 and a thermistor R55. The operational amplifier U2 is connected to pin 7 of the voltage regulator chip U1, and the thermistor R55 is connected to pin 6 of the operational amplifier U2.

[0054] Specifically, the thermistor R55, as a temperature-sensitive resistor element, can reduce its resistance value as the temperature rises, and this change is detected by the operational amplifier U2 connected to it; when the temperature in the circuit exceeds the preset safety threshold, the resistance value of the thermistor R55 will drop significantly, causing the input signal of the operational amplifier U2 to change, and the operational amplifier U2 converts this change into a corresponding output signal, which is then received and interpreted as a high temperature warning by the single-chip microcomputer U3. After receiving the high temperature warning, the single-chip microcomputer U3 will execute a preset protection program, such as turning off the start switch to stop the circuit from working, thereby avoiding damage to the equipment due to overheating or causing a safety accident. In addition, the combination of the operational amplifier U2 and the thermistor R55 can also be used for current limiting protection. When the current in the circuit exceeds the preset safety threshold, this change is converted into a signal that can be detected by the operational amplifier U2. The operational amplifier U2 then converts this signal into a corresponding output, triggering the current limiting protection program of the single-chip microcomputer U3. After receiving the current limiting warning, the single-chip microcomputer U3 will also perform corresponding protection measures, such as reducing the output voltage or shutting down the circuit, to ensure the safety of the circuit and the equipment.

[0055] See also Figure 7 As shown, the control unit 30 also includes a temperature sampling module 38, which includes a temperature sensor NTC, a resistor R70, a temperature sensor NTC1 and a resistor R68. One end of the resistor R70 is connected to pin 11 of the microcontroller U3, and the other end is connected to the temperature sensor NTC. One end of the resistor R68 is connected to pin 14 of the microcontroller U3, and the other end is connected to the temperature sensor NTC1.

[0056] Specifically, the temperature sampling module 38 detects the real-time temperature of the rectifier module radiator and the voltage regulator module radiator respectively through two temperature sensors NTC and NTC1. These sensors can accurately convert the temperature into an electrical signal so that the single-chip computer U3 can process it. The resistors R70 and R68 are used as voltage divider resistors, and they form a voltage divider circuit with the temperature sensors NTC and NTC1 respectively. These resistors convert the analog signal output by the temperature sensor into a voltage signal that can be recognized by the single-chip computer U3. The 11th and 14th pins of the single-chip computer U3 receive the voltage signals from the two voltage divider circuits respectively, thereby realizing the real-time detection of the temperature of the two radiators. When the single-chip computer U3 detects that the temperature of the rectifier module radiator or the voltage regulator module radiator exceeds the set threshold, the corresponding control program will be triggered. The control program turns on the cooling fan through the fan module 39 to increase the heat dissipation capacity of the radiator, thereby reducing the temperature of the radiator. In addition, by real-time monitoring and controlling the temperature of the radiator, it can effectively prevent the equipment from being damaged or causing safety accidents due to overheating. At the same time, timely cooling fan control can ensure that the equipment maintains a low temperature while operating efficiently, thereby extending the service life of the equipment and improving the stability of the equipment.

[0057] See also Figure 8 As shown, the control unit 30 also includes a fan module 39, which includes a rectifier module heat sink submodule and a voltage regulator module heat sink submodule. The rectifier module heat sink submodule includes a resistor R73, a MOS tube U13 and a fan FAN1. One end of the resistor R73 is connected to pin 12 of the single-chip computer U3, and the other end is connected to the MOS tube U13. The fan FAN1 is connected to the MOS tube U13; the voltage regulator module heat sink submodule includes a resistor R74, a MOS tube U14 and a fan FAN2. One end of the resistor R74 is connected to pin 1 of the single-chip computer U3, and the other end is connected to the MOS tube U14. The fan FAN2 is connected to the MOS tube U14.

[0058] Specifically, the rectifier module heat sink submodule and the voltage regulator module heat sink submodule are used to control the cooling fans of different parts respectively; in the rectifier module heat sink submodule, the resistor R73 receives the signal from the 12th pin of the single-chip computer U3, and controls the on and off of the MOS tube U13 according to this signal. When the single-chip computer U3 detects that the temperature of the rectifier module heat sink exceeds the set threshold, it will output a signal through the 12th pin to turn on the MOS tube U13, thereby starting the fan FAN1 for heat dissipation. In addition, the fan module 39 works in coordination with the temperature sampling module 38. The temperature sampling module 38 monitors the temperature of the rectifier module heat sink and the voltage regulator module heat sink in real time. When the temperature reaches or exceeds the preset safety threshold, the temperature sampling module 38 transmits the signal to the single-chip computer U3, and the single-chip computer U3 then starts the corresponding cooling fan through the fan module 39. In addition, timely heat dissipation control can effectively prevent the equipment from being damaged or causing safety accidents due to overheating, thereby improving the stability and safety of the equipment. When the equipment is running at high load, the heat dissipation function of the fan module 39 is particularly critical. It can quickly reduce the radiator temperature and maintain the normal operation of the equipment. In addition, through the intelligent control of the single-chip computer U3, the fan module 39 can achieve precise heat dissipation control and adjust the speed and working time of the cooling fan according to the real-time temperature, thereby achieving the purpose of energy saving and extending the service life of the equipment.

[0059] See also Fig. 9As shown, the control unit 30 also includes a voltage-stabilizing power supply module 341. The voltage-stabilizing chip power supply module 341 includes a resistor R35, a diode D11, a capacitor C25, a capacitor C26, a capacitor C23, a capacitor C24, a capacitor C16 and a voltage-stabilizing diode ZD3. One end of the resistor R35 is connected to the MOS tube Q3, and the diode D11, the capacitor C23, the capacitor C24, the capacitor C16, the voltage-stabilizing diode ZD3 and the 12th foot of the voltage-stabilizing chip U1 are connected to the other end of the resistor R35. The capacitor C23, the capacitor C24, the capacitor C16 and the voltage-stabilizing diode ZD3 are also grounded. The diode D11 is also connected to the 15th foot of the voltage-stabilizing chip U1, the capacitor C25 and the capacitor C26, and the capacitor C25 and the capacitor C26 are also connected to the 14th foot of the voltage-stabilizing chip U1.

[0060] Specifically, the core purpose of the voltage-stabilizing power supply module 341 is to provide a stable input voltage for the voltage-stabilizing chip U1. By using components such as the voltage-stabilizing diode ZD3, the module can adjust and stabilize the input voltage to ensure that it fluctuates within a certain range, thereby protecting the voltage-stabilizing chip U1 from the influence of unstable power supply. In addition, capacitors C23, C24, and C16 play a filtering role in the circuit. They can eliminate high-frequency noise and ripples on the power line, and further ensure the stability and purity of the input voltage. In addition, the diode D11 plays a role in reverse voltage protection here. When the polarity of the input voltage is wrong or a reverse voltage appears, D11 can be quickly turned on to guide the reverse voltage to the ground line, thereby avoiding damage to the voltage-stabilizing chip U1 due to the reverse voltage. In addition, the resistor R35 plays a role in current limitation and voltage distribution in the circuit. It is connected between the MOS tube Q3 and the other parts of the module to ensure the stable flow of current and may be used to adjust the size of the output voltage. Capacitors C25 and C26 are connected to the 14th foot of the voltage-stabilizing chip U1, which can be used to provide additional power supply filtering or stabilization functions.

[0061] See also Fig.10 As shown, the control unit 30 also includes a soft start voltage sampling module 321, which includes a resistor R62, a resistor R63, a resistor R65, a capacitor C36, a resistor R60, a resistor R61, a resistor R66 and a capacitor C35. One end of the resistor R62 is connected to the MOS tube Q3, and the other end is connected to the resistor R63 and the resistor R65. Pin 2 of the microcontroller U3 is connected to the resistor R65 and the capacitor C36. The resistor R63 and the capacitor C36 are also grounded. One end of the resistor R60 is connected to the filter capacitor C1, and the other end is connected to the resistor R66 and the resistor R61. Pin 9 of the microcontroller U3 is connected to the resistor R66 and the capacitor C35. The resistor R61 and the capacitor C35 are also grounded.

[0062] Specifically, the voltage of the soft start switch is sampled through a voltage divider network composed of resistors R62, R63 and R65. One end of the resistor R62 is connected to the MOS tube Q3, and the other end is connected to the resistor R63 and the resistor R65 to form a voltage divider. This configuration allows the module to sample the voltage at a specific ratio for subsequent processing. In addition, the sampled voltage is connected to pin 2 of the microcontroller U3 through the resistor R65 and the capacitor C36. The capacitor C36 is used for filtering to reduce noise and ripple in the sampled voltage. In addition, the soft start voltage sampling module 321 not only performs voltage sampling, but also participates in the soft start control process. When the power supply starts, the soft start switch module 32 realizes the slow start of the power supply by controlling the conduction and shutdown of related components (such as MOS tube Q3), avoiding the impact of instantaneous large current on the power supply and equipment. Through the interaction with the single-chip microcomputer U3, the module can adjust the parameters and process of the soft start according to the sampled voltage signal and other parameters. This adjustment can be based on the characteristics of the power supply, the requirements of the load or the operating state of the system; in addition, the circuit composed of resistor R60, resistor R61, resistor R66 and capacitor C35 is used to further filter and stabilize the sampled voltage, which helps to ensure the accuracy and stability of the sampled voltage, thereby improving the accuracy and reliability of the soft start control. In general, the soft start voltage sampling module 321 plays a key role in the control unit 30. It can not only sample the voltage related to the power supply and the soft start switch in real time, but also can realize the soft start control of the power supply based on these sampled data through the control of the single-chip microcomputer U3. This control can protect the power supply and load equipment from the impact of instantaneous large current and improve the stability and reliability of the system.

[0063] In this utility model, the components and their models and connection relationships not shown are Figures 4 to 10 The specific circuit diagram has been marked and will not be repeated here.

[0064] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A marine 24V DC output control system, characterized in that: include: A three-phase power receiving unit, a transformer and a plurality of control units connected in parallel, wherein the three-phase power receiving unit is used to receive 380V AC power and transmit it to the transformer, wherein the transformer is used to convert the 380V AC power into 24V AC power and transmit it to the control unit, wherein the control unit is used to convert the 24V AC power into 24V DC power and output it; the control unit comprises a rectifier module, a soft start switch module, a main control module, a voltage stabilizing module and an output module, wherein the rectifier module is used to receive the 24V AC power transmitted from the transformer and convert it into unstable DC power, wherein the soft start switch module is electrically connected to the rectifier module and the main control module, wherein the voltage stabilizing module is electrically connected to the soft start switch module and is used to convert the unstable DC power into stable 24V DC power, and wherein the output module is electrically connected to the voltage stabilizing module and is used to output 24V DC power.

2. The marine DC 24V output control system according to claim 1, characterized in that: The rectifier module includes a rectifier bridge U6 , one end of the rectifier bridge U6 is connected to the transformer, and the other end is connected to the soft start switch module.

3. The marine 24V DC output control system according to claim 2, characterized in that: The soft start switch module includes a MOS tube Q1, a resistor R1, a resistor R2, a resistor R3, a MOS tube Q2, a resistor R5, a filter capacitor C1, a resistor R6, a MOS tube Q3, a resistor R7, a MOS tube Q4 and a resistor R9. The MOS tube Q1, the resistor R1 and the resistor R2 are connected to the rectifier bridge U6. The MOS tube Q1 and the resistor R2 are also connected to the resistor R3. One end of the MOS tube Q2 is connected to the resistor R3, and the other end is connected to the resistor R5. The resistor R5 is connected to the main control module. The filter capacitor C1 is connected to the resistor R1, the MOS tube Q1, the resistor R6, the MOS tube Q3 and the main control module. The resistor R6 and the MOS tube Q3 are also connected to the resistor R7. One end of the MOS tube Q4 is connected to the resistor R7, and the other end is connected to the resistor R9. The resistor R9 is connected to the main control module.

4. The marine 24V DC output control system according to claim 3, characterized in that: The main control module includes a single chip microcomputer U3, wherein the 8th pin of the single chip microcomputer U3 is connected to the resistor R5, and the 7th pin of the single chip microcomputer U3 is connected to the resistor R9.

5. The marine 24V DC output control system according to claim 4, characterized in that: The control unit also includes a single-chip microcomputer power supply module, which includes a resistor R64, a voltage-stabilizing diode ZD6 and a power supply chip U12. One end of the resistor R64 is connected to the filter capacitor C1, and the other end is connected to the voltage-stabilizing diode ZD6. One end of the power supply chip U12 is connected to the voltage-stabilizing diode ZD6, and the other end is connected to pin 10 of the single-chip microcomputer U3.

6. The marine 24V DC output control system according to claim 5, characterized in that: The voltage stabilizing module includes a voltage stabilizing chip U1, a resistor R28, a capacitor C31, a resistor R37, a resistor R38, a resistor R39 and a resistor R40. One end of the resistor R28 is connected to the MOS tube Q3, and the other end is connected to pin 2 of the voltage stabilizing chip U1. Pin 8 of the voltage stabilizing chip U1 is connected to the capacitor C31, the resistor R37, the resistor R38 and the resistor R40. The resistor R39 is connected to the capacitor C31. The resistor R37, the resistor R39 and the pins 10 and 16 of the voltage stabilizing chip U1 are connected to the output module.

7. The marine 24V DC output control system according to claim 6, characterized in that: The output module includes MOS tube U7, MOS tube U8, inductor L1, capacitor C18, capacitor C19, capacitor C22 and an output end. Pin 10 of the voltage stabilizing chip U1 is connected to the MOS tube U8, and pin 16 of the voltage stabilizing chip U1 is connected to the MOS tube U7. The MOS tube U7 and MOS tube U8 are also connected to the inductor L1. The capacitor C18, capacitor C19, capacitor C22 and the output end are connected to the inductor L1.

8. The marine 24V DC output control system according to claim 7, characterized in that: The control unit also includes a current limiting and high temperature protection module, which includes an operational amplifier U2 and a thermistor R55. The operational amplifier U2 is connected to pin 7 of the voltage regulator chip U1, and the thermistor R55 is connected to pin 6 of the operational amplifier U2.

9. The marine 24V DC output control system according to claim 7, characterized in that: The control unit also includes a temperature sampling module, which includes a temperature sensor NTC, a resistor R70, a temperature sensor NTC1 and a resistor R68. One end of the resistor R70 is connected to pin 11 of the microcontroller U3, and the other end is connected to the temperature sensor NTC. One end of the resistor R68 is connected to pin 14 of the microcontroller U3, and the other end is connected to the temperature sensor NTC1.

Images