Switching power supply device for computer interlocking system

Abstract

The present invention relates to the technical field of computer interlocking systems, and in particular to a switching power supply device for a computer interlocking system. The device comprises a protection module, a first filter module, a PFC module, a second filter module, and a DC-DC module which are sequentially connected, and a control module and a detection module; an output state port of the PFC module and a start control port of the DC-DC module are separately connected to the control module; the detection module is separately connected to the DC-DC module and the control module; and the DC-DC module, the control module, and the detection module each comprise an external interface. Compared with the prior art, the present invention has advantages such as a compact structure, effective avoidance of a compatibility problem, improved system reliability, and reduced system development and maintenance costs.

Description

Switching power supply unit for computer interlocking systems Technical Field

[0001] This invention relates to the field of computer interlocking system technology, and in particular to a switching power supply device for computer interlocking systems. Background Technology

[0002] The iLOCK computer interlocking system (hereinafter referred to as the interlocking system) is based on the general "2-out-of-2" safety structure, with the addition of an independent "fault-safe" verification module and the adoption of NISAL technology, forming an intelligent safety computer interlocking system. The interlocking system comprehensively utilizes "reactive fault-safe," "combined fault-safe," and "inherent fault-safe" technologies, and adopts a dual-CPU voting output method to form a comprehensive safety system with high security performance.

[0003] Currently, the power modules used in the power supply chassis of interlocking systems mainly rely on different suppliers. Regarding the structure of the power modules, compatibility issues easily arise during integration of sub-modules from different suppliers. Furthermore, the complex circuit design of the power modules reduces their reliability, increases system debugging difficulty, limits flexible maintenance and upgrades, and hinders improvements in power density and efficiency, thus shortening their lifespan. However, a search reveals limited research specifically on improved designs for power modules in iLOCK-type computer interlocking systems. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a switching power supply device for a computer interlocking system. This switching power supply device adopts a highly modular design, is equipped with multiple external control interfaces, has a simple circuit, small size, high reliability, and can ensure a large power density while having high conversion efficiency, and has good versatility.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] This invention provides a switching power supply device for a computer interlocking system, comprising a protection module, a first filtering module, a PFC module, a second filtering module, and a DC-DC module connected in sequence, as well as a control module and a detection module; the output status port of the PFC module and the start control port of the DC-DC module are respectively connected to the control module, and the detection module is respectively connected to the DC-DC module and the control module; the DC-DC module, the control module, and the detection module all include external interfaces.

[0007] As a preferred technical solution, the DC-DC module includes a DC-DC unit and a voltage regulator and filter circuit. The input terminal of the DC-DC unit is connected to the output terminal of the second filter module and is also connected to the start control port. The output terminal of the DC-DC unit is connected to the voltage regulator and filter circuit and has a remote compensation external interface. The negative output line of the voltage regulator and filter circuit is provided with a current detection point, and the positive output line is provided with a voltage detection point.

[0008] As a preferred technical solution, the detection module includes a voltage sampling circuit, a current sampling circuit, and an over-temperature protection circuit; the input terminal of the voltage sampling circuit is connected to the voltage detection point of the DC-DC module, and the voltage sampling port is connected to the control module; the input terminal of the current sampling circuit is connected to the current detection point of the DC-DC module, the current sampling port is connected to the control module, and the fine-tuning output port is connected to the fine-tuning control port of the DC-DC module; the over-temperature protection circuit includes an over-temperature protection interface, and the over-temperature protection interface is connected to the control module.

[0009] As a preferred technical solution, the voltage sampling circuit includes a voltage sampling input terminal, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a transient suppression diode, a first capacitor, and a second capacitor. The voltage sampling input terminal, the first resistor, the second resistor, the third resistor, and the fourth resistor are connected in sequence. The other end of the fourth resistor is grounded. The transient suppression diode is connected in parallel across the fourth resistor. The fifth resistor is connected in series with the first capacitor and then in parallel across the transient suppression diode. The second capacitor is connected in parallel across the first capacitor. The intersection of the fifth resistor, the first capacitor, and the second capacitor is the voltage sampling port.

[0010] As a preferred technical solution, the current sampling circuit includes a first amplifier, a second amplifier, a third amplifier, and a fourth amplifier. The input terminal of the current sampling circuit is connected to the input terminal of the first amplifier through multiple resistors and capacitors. The output terminal of the first amplifier is connected to the input terminals of the second amplifier and the third amplifier through multiple resistors and capacitors, respectively. The output terminal of the second amplifier is connected to the input terminal of the fourth amplifier through multiple resistors, diodes, and capacitors. A current sharing control external interface is connected to the transmission circuit between the second amplifier and the fourth amplifier. The output terminal of the third amplifier is connected to the current sampling port through multiple resistors and capacitors. The output terminal of the fourth amplifier is connected to the fine-tuning output port through multiple resistors, capacitors, and diodes.

[0011] As a preferred technical solution, the over-temperature protection circuit includes a sixth resistor, a seventh resistor, a thermistor, a third capacitor, a fourth capacitor, and a fifth capacitor. The sixth resistor and the fourth capacitor are connected in series and then connected in parallel across the two ends of the third capacitor. The thermistor is connected in parallel across the two ends of the fourth capacitor. The seventh resistor and the fifth capacitor are connected in series and then connected in parallel across the two ends of the thermistor. The junction of the seventh resistor and the fifth capacitor is the over-temperature protection interface.

[0012] As a preferred technical solution, the control module includes a microcontroller control circuit and a remote switch control circuit. One end of the remote switch control circuit includes a remote switch external interface, and the other end is connected to the microcontroller control circuit. The microcontroller control circuit is connected to the output status port of the PFC module, the start control port of the DC-DC module, and the detection module, respectively.

[0013] As a preferred technical solution, the device further includes an auxiliary power supply module, which includes an auxiliary power supply. The input terminal of the auxiliary power supply is connected to the DC-DC module, and the output terminal includes a first load circuit and a second load circuit. The first load circuit is connected between the positive and negative outputs of the auxiliary power supply, and the second load circuit is connected to the ground pin of the auxiliary power supply.

[0014] As a preferred technical solution, the device further includes a fan drive circuit, a fan speed regulation circuit, and a fan control circuit; the input terminal of the fan drive circuit is connected to the DC-DC module, and the output terminal is connected to the corresponding interfaces of the fan speed regulation circuit and the fan control circuit, respectively; the fan controlled terminal of the fan control circuit is connected to the fan speed regulation circuit; and the fan drive circuit and the fan speed regulation circuit are respectively connected to the control module.

[0015] As a preferred technical solution, the switching power supply device further includes an indicator light circuit, which is connected to the control module.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The switching power supply device of the present invention includes a protection module, a first filtering module, a PFC module, a second filtering module, a DC-DC module, a control module, and a detection module. The modular approach adopted in the power supply design stage can ensure the consistency of performance between the modules. The structure is clear and easy to maintain, which can effectively reduce the probability of the switching power supply encountering compatibility problems, improve the reliability of the system, and the simplified circuit structure can reduce the debugging difficulty. It is also conducive to the flexible maintenance and upgrading of the power supply, thereby reducing the cost of system development and maintenance.

[0018] 2. The combined design of the first filter module, PFC module and second filter module in this invention can ensure high power while having high conversion efficiency, which is beneficial to extending the service life of the switching power supply. It also has a compact structure and wide applicability. In actual use, it can achieve 300W output with an output efficiency of not less than 85% and a size of less than 165mm×82mm×61mm.

[0019] 3. The detection module in this invention includes a voltage sampling circuit, a current sampling circuit, and an over-temperature protection circuit. The voltage sampling circuit and the current sampling circuit enable this invention to have output feedback function, which can protect against abnormal voltage and current output. The over-temperature protection circuit enables this invention to have real-time temperature monitoring and control function, which can protect against abnormal temperature. At the same time, it has current and voltage protection function and over-temperature protection function, which can effectively improve the reliability of the switching power supply.

[0020] 4. In this invention, the over-temperature protection circuit works in conjunction with the fan speed control to dissipate heat, enabling rapid and precise temperature regulation;

[0021] 5. The control module of this invention has a remote switching external interface, the detection module has a current sharing control external interface, and the DC-DC module has a remote compensation external interface, etc. It is widely used and can be applied to various complex application scenarios, effectively improving the versatility of the switching power supply. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the structure of the device provided by the present invention;

[0023] Figure 2 is a structural block diagram of the device provided in an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram showing the sequential connection of the protection module, the first filtering module, the PFC module and the second filtering module in an embodiment of the present invention.

[0025] Figure 4 is an enlarged schematic diagram of the protection module in an embodiment of the present invention;

[0026] Figure 5 is an enlarged schematic diagram of the first filtering module in an embodiment of the present invention;

[0027] Figure 6 is an enlarged schematic diagram of the PFC module in an embodiment of the present invention;

[0028] Figure 7 is an enlarged schematic diagram of the second filtering module in an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of the overall structure of the DC-DC module in an embodiment of the present invention;

[0030] Figure 9 is a schematic diagram of the structure of the DC-DC unit in an embodiment of the present invention;

[0031] Figure 10 is a schematic diagram of the voltage stabilizing filter circuit in an embodiment of the present invention;

[0032] Figure 11 is a schematic diagram of the voltage sampling circuit in an embodiment of the present invention;

[0033] Figure 12 is a schematic diagram of the overall structure of the current sampling circuit in an embodiment of the present invention;

[0034] Figure 13 is an enlarged schematic diagram of the first part of the current sampling circuit in an embodiment of the present invention;

[0035] Figure 14 is an enlarged schematic diagram of the second part of the current sampling circuit in an embodiment of the present invention;

[0036] Figure 15 is an enlarged schematic diagram of the third part of the current sampling circuit in an embodiment of the present invention;

[0037] Figure 16 is a schematic diagram of the over-temperature protection circuit in an embodiment of the present invention;

[0038] Figure 17 is a schematic diagram of the remote switch control circuit in an embodiment of the present invention;

[0039] Figure 18 is a schematic diagram of the microcontroller control circuit in an embodiment of the present invention;

[0040] Figure 19 is a schematic diagram of the auxiliary power module in an embodiment of the present invention;

[0041] Figure 20 is a schematic diagram of the fan drive circuit in an embodiment of the present invention;

[0042] Figure 21 is a schematic diagram of the fan speed control circuit in an embodiment of the present invention;

[0043] Figure 22 is a schematic diagram of the fan control circuit in an embodiment of the present invention;

[0044] Figure 23 is a schematic diagram of the indicator light circuit in an embodiment of the present invention;

[0045] The components include: 1. Protection module; 2. First filter module; 3. PFC module; 4. Second filter module; 5. DC-DC module; 6. Control module; 7. Detection module; 51. DC-DC unit; 52. Voltage stabilizing and filtering circuit. Detailed Implementation

[0046] In this invention, PFC stands for Power Factor Correction; OTP stands for Over Temperature Protection. The invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of this invention, providing detailed implementation methods and specific operating procedures, but the scope of protection of this invention is not limited to the following embodiments.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. The model numbers of the components in the accompanying drawings are for reference only and are not intended to limit the technical features. Example

[0048] As shown in Figure 1, this embodiment provides a switching power supply device, which includes a protection module 1, a first filter module 2, a PFC module 3, a second filter module 4, and a DC-DC module 5 connected in sequence, as well as a control module 6 and a detection module 7. The output status port of the PFC module 3 and the start control port of the DC-DC module 5 are respectively connected to the corresponding interfaces in the control module 6. The detection module 7 is connected to both the DC-DC module 5 and the control module 6. The DC-DC module 5, the control module 6, and the detection module 7 all include external interfaces. Figure 2 shows a structural block diagram of the switching power supply device provided in this embodiment. The input of the entire device is 220V AC voltage, and the output is 24V DC voltage. As shown in Figure 3, the protection module 1, the first filter module 2, the PFC module 3, and the second filter module 4 are connected in sequence.

[0049] As shown in Figure 4, protection module 1 includes a fuse F100 and a varistor RV100. One end of the fuse F100 is connected to the live wire (L), and the varistor RV100 is connected between the live wire (L) and the neutral wire (N), with one end of it connected to the other end of the fuse F100. Protection module 1 provides overcurrent and overvoltage protection through passive devices.

[0050] As shown in Figures 5-7, the first filter module 2 includes capacitor CX102, common-mode inductor LF102, capacitor CY100, capacitor CY103, capacitor CX103, resistor R100, resistor R101, resistor R102, common-mode inductor LF101, capacitor CX101, capacitor CX100, capacitor CY101, and capacitor CY104. The PFC module 3 includes PFC power supply U100, resistor R103, resistor R104, optocoupler U101, resistor R105, and capacitor C105. The second filter module 4 includes capacitor CY102, capacitor CY105, and electrolytic capacitors C100-C104. The specific connection relationships are as follows:

[0051] Capacitor CX102 is connected in parallel across the two ends of varistor RV100, and its two ends are respectively connected to one side of common-mode inductor LF102. The other side of common-mode inductor LF102 and one side of common-mode inductor LF101 are connected in parallel with a total of three parts: the first part consists of capacitors CY100 and CY103 connected in series; the second part is capacitor CX103; and the third part consists of resistors R100, R101, and R102 connected in series. The other side of common-mode inductor LF101 is also connected in parallel with the input terminals (pins L and N) of PFC power supply U100 with three parts: the first part is capacitor CX101; the second part is capacitor CX100; and the third part consists of capacitors CY101 and CY104 connected in series.

[0052] The output terminals (pins +VO and -VO) of the PFC power supply U100 are connected to the second filter module 4. Specifically, one end of the series connection of capacitors CY102 and CY105, and one end of each of the electrolytic capacitors C100 to C104 are connected to the positive output pin +VO. The other end of the series connection of capacitors CY102 and CY105, and the other end of each of the electrolytic capacitors C100 to C104 are connected to the negative output pin -VO. The output of the second filter module 4 is 300V DC. Furthermore, pins ENA and AUX of the PFC power supply U100 are connected to input pins 2 and 1 of the optocoupler U101, respectively. Capacitor C105 is connected in parallel between output pins 4 and 3 of the optocoupler U101. One end of capacitor C105 is connected to 3.3VS through resistor R105, and the other end is grounded. The junction of output pin 4 and capacitor C105 is connected to the output status port (PFCOK). A high level at PFCOK indicates an abnormality, while a low level indicates normal operation. The output status port PFCOK is connected to the PFCOK interface of control module 6.

[0053] The first filter module 2 and the second filter module 4 are connected to the two ends of the PFC power supply U100, respectively. This two-stage filtering setup improves power supply stability, suppresses electromagnetic interference, and enhances the compatibility of electronic products. The second filter module 42, composed of electrolytic capacitors and inductors, is used to filter ripple, prevent surges, protect the circuit, and regulate voltage and reduce noise. In the PFC module 3, a GQPF350-390IN is sampled. The main function of this module is to reduce electromagnetic interference, improve the power factor, and thus increase energy efficiency.

[0054] As shown in Figure 8, the DC-DC module 5 includes a DC-DC unit 51 and a voltage regulator and filter circuit 52 connected in sequence. The entire DC-DC module 5 outputs a final 24V voltage after passing through the voltage regulator and filter circuit 52. The main function of the DC-DC module 5 is to convert a 300V DC voltage into a 24V DC voltage.

[0055] In some embodiments, as shown in FIG9, the input terminal of DC-DC unit 51 is connected to the output terminal of second filter module 4, and capacitor C111 is connected between positive and negative voltages. The two ends of capacitor C111 are respectively connected to one side of common mode inductor L104, and the other side of common mode inductor L104 outputs positive voltage and negative voltage respectively.

[0056] At the input of DC-DC power supply U103, pins +VIN and -VIN receive the aforementioned positive and negative voltages, respectively. Three parts are connected in parallel between the common-mode inductor L104 and the positive and negative voltage transmission lines of DC-DC power supply U103: the first part is capacitor C112, the second part is capacitors CY108 and CY109 connected in series, and the third part is electrolytic capacitor C109. Pin RC of DC-DC power supply U103 is connected to pin 4 of optocoupler U104 via resistor R115, and also to pin 3 of optocoupler U104 via capacitor C114. One end of capacitor C114 is also connected to pin -VIN of DC-DC power supply U103. Pins 1 and 2 of optocoupler U104 are connected to the two ends of capacitor C115, and pin 1 is also connected to 3.3VS via resistor R113. Pin 2 is also grounded. The junction of resistor R113 and capacitor C115 is connected to the start control port (i.e., 5V ON / OFF), which is connected to the 5V ON / OFF interface of control module 6.

[0057] At the output of the DC-DC power supply U103, pins +VOUT and -VOUT output positive and negative voltages respectively. Pin -VOUT is connected to the negative output of common-mode inductor L104 and grounded, while pin +VOUT outputs 24V. Pin +SENSE is connected to pin -SENSE via resistors R108, RV200, and R109 in sequence. Pin Trim is connected to pin -SENSE via capacitor C, and also connected between resistors R108 and R109. The intersection of pin Trim, resistors R108 and R109 forms the trim control port TRIM1. The output of pin -SENSE is the voltage return path point, and the output of pin +SENSE is the remote compensation external interface. The aforementioned pins +SENSE, Trim, and -SENSE, along with related circuit connections, are used for both remote voltage compensation and output voltage detection, working together to ensure stable output voltage.

[0058] As shown in Figure 10, the positive and negative inputs of the voltage regulator and filter circuit 52 are connected to the +VOUT and -VOUT pins of the DC-DC power supply U103, respectively. After the four parts are connected in parallel, the positive terminal of the voltage regulator and filter circuit 52 outputs a 24V voltage, and the negative terminal is grounded. The four parts connected in parallel in the middle include: capacitors CY106 and CY110 connected in series, a separate electrolytic capacitor C110, a separate electrolytic capacitor C108, and capacitors CY107 and CY111 connected in series.

[0059] In addition, a sensing resistor for sampling is set on the output pin -VOUT of the DC-DC power supply U103. The two ends of the sensing resistor are the current sensing points I_V1- and I_V1+. Resistor R110 is connected to the negative voltage output line, and resistor R112 is connected in parallel across its ends. Resistor R112 is connected to a cooling resistor R114. On the output pin +VOUT, a voltage sensing point 24VCC is set. The current sensing points I_V1- and I_V1+ are connected to the detection module 7 for current sampling and circuit output overload protection. The voltage sensing point 24VCC is also connected to the detection module 7 for voltage sampling and feedback control to provide output overvoltage protection.

[0060] The detection module 7 includes a voltage sampling circuit, a current sampling circuit, and an over-temperature protection circuit. Specifically, the detection module 7 uses the current sampling circuit for current detection, the voltage sampling circuit for voltage detection, and the over-temperature protection circuit for temperature detection. This module is mainly used to monitor changes in current, voltage, and temperature during power supply operation, ensuring stable operation of the switching power supply and improving system safety and reliability. The combined use of the voltage sampling circuit, current sampling circuit, and control module 6 effectively improves the power supply's transient response capability.

[0061] In some embodiments, as shown in Figure 11, the input terminal 24VCC of the voltage sampling circuit is connected to the voltage detection point 24VCC of the DC-DC module, and the voltage sampling port Vo_sense is connected to the corresponding port of the control module 6. In the voltage sampling circuit, the input terminal 24VCC is grounded after passing through R701~R704 (i.e., the first resistor~the fourth resistor) in sequence. A transient suppression diode TVS700 is connected in parallel across the two ends of resistor R704 (i.e., the fourth resistor). Resistor R705 (i.e., the fifth resistor) is connected to capacitor C701 (i.e., the first capacitor) and then connected in parallel across the transient suppression diode TVS700. Capacitor C702 (i.e., the second capacitor) is connected in parallel across the two ends of capacitor C701. The intersection of resistor R705, capacitor 701 and capacitor C702 is the voltage sampling port Vo_sense.

[0062] In some embodiments, as shown in FIG12, the input terminal of the current sampling circuit is connected to the current detection points I_V1- and I_V1+ of the DC-DC module 5, the current sampling port Iout1 is connected to the corresponding port of the control module 6, and the fine-tuning output port is connected to the fine-tuning control port TRIM1 of the DC-DC module 5. The current sampling circuit includes three circuit parts connected in sequence, and the partial enlarged views of each part are shown in FIG13 to FIG15.

[0063] As shown in Figure 13, the first part includes a current sampling input terminal, which is connected to the current detection points I_V1- and I_V1+, and is connected to the positive and negative input terminals of amplifier U801 (i.e., the first amplifier) ​​through resistors R801~R803 and capacitors C801~C802. The output terminal of amplifier U801 (i.e., pin 1) is connected to the second part of the structure through resistors R805~R807.

[0064] As shown in Figure 14, the second part includes two amplifiers, U802 and U803 (i.e., the second amplifier and the third amplifier). The input terminals of amplifiers U802 and U803 are connected to the output terminal of amplifier U801, respectively. Amplifier U802 is connected to the third part through resistors R809, resistors R812~R815, diodes D1~D2, and capacitor C810. One end of diode D1 is connected to the output terminal of amplifier U802, and the other end, together with diode D2 and resistor R812, is connected to resistor R813. The other end of resistor R813 is the current sharing input terminal, i.e., the external interface +5V_SHARE for current sharing control. The output terminal of amplifier U803 is connected to multiple resistors and capacitors. The intersection of resistors R810, R811, and capacitors C808 and C809 is the current sampling port Iout1.

[0065] As shown in Figure 15, in the third part, the input terminal of amplifier U804 (i.e., the fourth amplifier) ​​is connected to amplifier U802 through multiple resistors and capacitors, and the output terminal is connected to resistor R820 through diode D3. The other end of resistor R820 is the fine-tuning output port TRIM1, which is connected to the fine-tuning control port TRIM1 of DC-DC module 5. Together with DC-DC module 5, it realizes precise adjustment of output voltage and current, ensures stable output voltage, and improves circuit reliability.

[0066] The function of the current sharing control external interface is to receive and respond to external current sharing control signals. When multiple DC-DC modules 5 are connected in parallel, the output of the DC-DC module 5 can be adjusted through the current sharing control external interface +5V_SHARE and the operational amplifier comparison feedback circuit. The operational amplifier comparison feedback circuit includes at least the amplifier U802 and its related connections shown in Figure 14, and the amplifier U804 and its related connections shown in Figure 15.

[0067] In some embodiments, as shown in Figure 16, the over-temperature protection circuit utilizes resistors R302~R303 (i.e., the sixth and seventh resistors), capacitors C306~C308 (i.e., the third, fourth, and fifth capacitors), and a thermistor NTC300 to form a loop. Specifically, resistor R302 and capacitor C307 are connected in series and then in parallel across capacitor C306; the thermistor NTC300 is connected in parallel across capacitor C307; resistor R303 and capacitor C308 are connected in series and then in parallel across the thermistor NTC300; the junction of resistor R303 and capacitor C308 is the over-temperature protection interface (i.e., the OTP interface). The over-temperature protection circuit uses the thermistor as a temperature sensor, utilizing its resistance change with temperature, and connects the over-temperature protection interface to the corresponding OTP interface of control module 6 to monitor and control the temperature of the switching power supply in real time, further improving the reliability of the switching power supply.

[0068] Control module 6 includes a remote switch control circuit and a microcontroller control circuit. One end of the remote switch control circuit is connected to a remote switch, and the other end is connected to the microcontroller control circuit, enabling the microcontroller control circuit to receive external input signals and making its use more flexible. The main functions of this module are, on the one hand, to receive external input signals to control the DC-DC module 5, and on the other hand, to detect voltage signals, current signals, and temperature control signals, thereby controlling the output of the DC-DC module 5 and the fan.

[0069] In some embodiments, as shown in FIG17, the remote switch control circuit includes a remote control terminal (CNT and TOG, i.e., the remote switch external interface) and a remote control output terminal (port A). A transistor Q301, a diode D300, resistors R311~R315 and capacitors C314~C313 are provided between the two terminals. The junction of resistor R311 and transistor Q301 is connected to the remote control output terminal.

[0070] In some embodiments, as shown in Figure 18, in the microcontroller control circuit, pin PB5 of controller U300 is connected to port A of remote switch control circuit to receive remote switch control signal; pins PA0 and PA1 are respectively connected to the current sampling port Iout1 of current sampling circuit and the voltage sampling port Vo_sense of voltage sampling circuit; pin PB1 is connected to the over-temperature protection interface OTP in over-temperature protection circuit. Based on the external remote switch control signal, current detection input, voltage detection input and temperature detection input, controller U300 can accurately control the switching of DC-DC module 5; pin PA6 is connected to the start control port 5V ON / OFF of DC-DC module 5 to output start control signal; pin PA7 is connected to the output status port PFCOK of PFC module 3.

[0071] In some embodiments, the switching power supply device provided by the present invention further includes an auxiliary power supply module. The auxiliary power supply module includes an auxiliary power supply M201. Part (a) of Figure 19 shows a schematic diagram of the input terminal structure of the auxiliary power supply M201, and part (b) of Figure 19 shows a schematic diagram of its output terminal structure. The input terminals (BUS+ and BUS-) of the auxiliary power supply M201 are connected to the input terminals of the DC-DC module 5, and the positive input is connected to the +VIN pin of the auxiliary power supply M201 through an inductor L200. The negative input is connected to the 12V interface of the auxiliary power supply M201. The input terminals also include capacitors C213 and C214 connected between the positive and negative inputs, and resistors R204 and R205, and capacitors C223, C224, and C219 connected in parallel on the negative input line. The output terminals of the auxiliary power supply M201 include a first load circuit and a second load circuit. The first load circuit is connected between the positive and negative output pins, consisting of capacitors C208-C212 and component U201. The second load circuit is connected between the ground pin and the 5V pin, consisting of capacitors C215-C218, capacitors C220-C222, and component U202. Additionally, the ground pin is connected to the negative input line and the 12V interface. The auxiliary power module provides an independent power supply loop, serving as part of the system's safety redundancy and contributing to further improved system reliability and fault tolerance.

[0072] In some embodiments, as shown in Figures 20-22, the switching power supply device provided by the present invention further includes a fan drive circuit, a fan speed control circuit, and a fan control circuit. Part (a) of Figure 20 shows the input structure of the fan drive circuit, and part (b) shows its output structure. The input terminal of the fan drive circuit is connected to the input terminal of the DC-DC module 5, and the output terminal (12V) is connected to the corresponding interfaces of the fan speed control circuit and the fan control circuit. The fan control terminal CTRLFAN of the fan control circuit is connected to the CTRLFAN of the fan speed control circuit. Both the fan drive circuit and the fan speed control circuit include a PWM signal control interface, namely the fan speed control terminal FANPMW, which is connected to pin PA4 of the controller U300. This pin outputs a PWM control signal, mainly used to control the fan speed, thereby adjusting the heat dissipation effect and improving the thermal management capability of the power supply.

[0073] In some embodiments, as shown in FIG23, the switching power supply device provided by the present invention further includes an indicator light circuit. The indicator light switch interface LED ON of the circuit is connected to pin PA2 of the controller U300 to receive control signals. When the interface LED ON is high level, the indicator light is on, and when it is low level, the indicator light is off.

[0074] The working principle of the switching power supply device for a computer interlocking system provided in this embodiment is as follows:

[0075] In a computer-controlled interlocking system, after the controllable coding unit powers on, it first initializes the system parameters and various external interfaces, periodically acquires CAN communication handshake signals, and when the host sends an encoded signal via the CAN bus, the controllable coding unit promptly updates the encoded information and replies with a configuration success message. The PC control terminal adjusts the FSK signal output according to the strength of the signal sent by the controllable coding unit, and the controllable coding unit also replies with a configuration success message to the host upon successful configuration. The host can query the operating status, configuration data, and alarm information of the controllable coding unit as needed.

[0076] After the switching power supply is powered on, the input port has a protection module 1 (including a fuse and a varistor), a first filter module 2, a PFC module 3, and a second filter module 4. The fuse provides overcurrent protection; when the current exceeds the rated value, the fuse will disconnect the circuit, protecting downstream circuit components from damage. The varistor is mainly used to absorb instantaneous energy pulses, such as lightning and surges, to protect the circuit from overvoltage damage. The filter module is used to filter out high-frequency noise and interference in the power supply, improving its purity. Two-stage filtering provides better filtering performance, ensuring power quality at the rectifier module input, and the PFC module 3 further improves the power factor, ultimately converting the 220V AC voltage to 300V DC voltage.

[0077] DC-DC module 5 converts 300V DC voltage to 24V DC voltage. Control module 6 controls DC-DC module 5 based on inputs from the external interface and detection inputs from detection module 7.

[0078] The remote switch control circuit receives the external input signal "remote switch" and transmits it to the microcontroller control circuit. The microcontroller control circuit responds and can switch the DC-DC module 5 on or off via the "start control" signal. At the same time, when the temperature protection circuit, voltage sampling circuit, and current sampling circuit detect that the input temperature, voltage, and current input signals exceed the rated values, the microcontroller control circuit responds and outputs the corresponding control signal to shut down the DC-DC module 5.

[0079] In addition, the "remote compensation" external interface of DC-DC module 5 can receive remote control signals to realize remote sensing function, which is used to compensate for the voltage drop of the wiring from the output terminal to the load terminal.

[0080] When multiple DC-DC modules 5 are connected in parallel, the "current sharing control" external interface +5V_SHARE of the current sampling circuit receives and responds to the external current sharing control signal. At the same time, it is connected to the corresponding interface of the control module 6 through the current sampling port Iout1. The "current sharing control" port +5V_SHARE adjusts the output through the operational amplifier comparison feedback circuit, thereby adjusting the output of the DC-DC module 5 in real time.

[0081] When the temperature exceeds the limit, the control module 6 first increases the fan speed through the fan drive circuit, fan speed regulation circuit and fan control circuit to dissipate heat. If the temperature still exceeds the rated value when the fan speed reaches the maximum value, the DC-DC module 5 is shut down.

[0082] In summary, this invention simultaneously provides output short-circuit protection, output overvoltage protection, output overload protection, overtemperature protection, low output voltage detection, remote sensing, parallel current sharing control, and remote switching control. In practical applications, the switching power supply device provided by this invention can achieve a 300Ω output, an output efficiency of no less than 85%, and a size of less than 165mm × 82mm × 61mm, while simultaneously meeting the requirements of high output power, high conversion efficiency, and compact circuit structure.

[0083] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A switching power supply device for a computer interlocking system, characterized by comprising: It includes a protection module, a first filtering module, a PFC module, a second filtering module, and a DC-DC module connected in sequence, as well as a control module and a detection module; the output status port of the PFC module and the start control port of the DC-DC module are respectively connected to the control module, and the detection module is respectively connected to the DC-DC module and the control module. The DC-DC module, the control module, and the detection module all include external interfaces.

2. The switching power supply device for a computer interlocking system according to claim 1, characterized by, The DC-DC module includes a DC-DC unit and a voltage regulator and filter circuit. The input terminal of the DC-DC unit is connected to the output terminal of the second filter module and is also connected to the start control port. The output terminal of the DC-DC unit is connected to the voltage regulator and filter circuit and has a remote compensation external interface. The negative output line of the voltage regulator and filter circuit is provided with a current detection point, and the positive output line is provided with a voltage detection point.

3. The switching power supply device for a computer interlocking system according to claim 1, characterized by, The detection module includes a voltage sampling circuit, a current sampling circuit, and an over-temperature protection circuit. The input terminal of the voltage sampling circuit is connected to the voltage detection point of the DC-DC module, and the voltage sampling port is connected to the control module. The input terminal of the current sampling circuit is connected to the current detection point of the DC-DC module, the current sampling port is connected to the control module, and the fine-tuning output port is connected to the fine-tuning control port of the DC-DC module. The over-temperature protection circuit includes an over-temperature protection interface, which is connected to the control module.

4. The switching power supply device for a computer interlocking system according to claim 3, characterized by The voltage sampling circuit includes a voltage sampling input terminal, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a transient suppression diode, a first capacitor, and a second capacitor. The voltage sampling input terminal, the first resistor, the second resistor, the third resistor, and the fourth resistor are connected in sequence. The other end of the fourth resistor is grounded. The transient suppression diode is connected in parallel across the fourth resistor. The fifth resistor and the first capacitor are connected in series and then in parallel across the transient suppression diode. The second capacitor is connected in parallel across the first capacitor. The intersection of the fifth resistor, the first capacitor, and the second capacitor is the voltage sampling port.

5. The switching power supply device for a computer interlocking system according to claim 3, wherein The current sampling circuit includes a first amplifier, a second amplifier, a third amplifier, and a fourth amplifier. The input terminal of the current sampling circuit is connected to the input terminal of the first amplifier through multiple resistors and capacitors. The output terminal of the first amplifier is connected to the input terminals of the second amplifier and the third amplifier through multiple resistors and capacitors, respectively. The output terminal of the second amplifier is connected to the input terminal of the fourth amplifier through multiple resistors, diodes, and capacitors. An external interface for current sharing control is connected to the transmission circuit between the second amplifier and the fourth amplifier. The output terminal of the third amplifier is connected to the current sampling port through multiple resistors and capacitors. The output terminal of the fourth amplifier is connected to the fine-tuning output port through multiple resistors, capacitors, and diodes.

6. The switching power supply device for a computer interlocking system according to claim 3, wherein The over-temperature protection circuit includes a sixth resistor, a seventh resistor, a thermistor, a third capacitor, a fourth capacitor, and a fifth capacitor. The sixth resistor and the fourth capacitor are connected in series and then connected in parallel across the two ends of the third capacitor. The thermistor is connected in parallel across the two ends of the fourth capacitor. The seventh resistor and the fifth capacitor are connected in series and then connected in parallel across the two ends of the thermistor. The junction of the seventh resistor and the fifth capacitor is the over-temperature protection interface.

7. The switching power supply device for a computer interlocking system according to claim 1, characterized by The control module includes a microcontroller control circuit and a remote switch control circuit. One end of the remote switch control circuit includes a remote switch external interface, and the other end is connected to the microcontroller control circuit. The microcontroller control circuit is connected to the output status port of the PFC module, the start control port of the DC-DC module, and the detection module, respectively.

8. The switching power supply device for a computer interlocking system according to claim 1, characterized by The device further includes an auxiliary power supply module, which includes an auxiliary power supply. The input terminal of the auxiliary power supply is connected to the DC-DC module, and the output terminal includes a first load circuit and a second load circuit. The first load circuit is connected between the positive and negative outputs of the auxiliary power supply, and the second load circuit is connected to the ground pin of the auxiliary power supply.

9. The switching power supply device for a computer interlocking system according to claim 1, characterized by The device further includes a fan drive circuit, a fan speed control circuit, and a fan control circuit; the input terminal of the fan drive circuit is connected to the DC-DC module, and the output terminal is connected to the corresponding interfaces of the fan speed control circuit and the fan control circuit, respectively; the fan controlled terminal of the fan control circuit is connected to the fan speed control circuit; and the fan drive circuit and the fan speed control circuit are respectively connected to the control module.

10. The switching power supply device for a computer interlocking system according to claim 1, characterized by The switching power supply device also includes an indicator light circuit, which is connected to the control module.

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