A DC 5V output power supply

Abstract

The present invention provides a 5V DC output power supply comprising a sequentially connected input rectifier module U1, a DC / DC module U2, an output rectifier and filter circuit unit, and a hot-swappable circuit unit. The DC / DC module U2 and an optocoupler U8 form an external control port. By adopting the aforementioned technical solution, the present invention provides a small 5V DC switching power supply with a simple circuit, compact size, and stable and controllable output. The modular circuitry provides input overvoltage and overcurrent protection, output current limiting protection, and output short-circuit protection. This allows for remote control of the power supply. The card-based structure allows for direct insertion into the Camelback control system card cage, making installation easy and compact.

Description

Technical Field

[0001] The present invention belongs to the technical field of switching power supplies, and in particular relates to a DC 5V output power supply, which is applied to power supply equipment in railway systems. Its main purpose is to provide stable DC 5V for electrical equipment. The power supply module has multiple protection functions and can meet the requirements of different application scenarios. Background Art

[0002] With the rapid development of power electronics technology, the workload of railway hump yards is increasing. The power consumption of hump system boards is high, and the power consumption of intelligent control boards is also increasing sharply. Such equipment cannot do without a reliable power supply.

[0003] At the same time, due to the limited space of the equipment, a power supply with small size and high power is urgently needed. The existing power supply cannot be remotely controlled. At the same time, it must have the advantages of light weight, high efficiency, low heat generation, easy use, and stable performance. This power supply is designed according to the above requirements. Summary of the Invention

[0004] In view of this, the present invention aims to provide a DC 5V output power supply to solve the above problems.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A 5V DC output power supply comprises an input rectifier module U1, a DC / DC module U2, an output rectifier filter circuit unit and a hot-swap circuit unit connected in sequence. The DC / DC module U2 and an optical coupler U8 form an external control port.

[0007] Furthermore, the model of the input rectifier module U1 is FARM1C21, and the model of the DC / DC module U2 is V300C5C100BL. The N pin of the input rectifier module U1 is connected to the 220V-L terminal through the varistor Z1, the L pin is connected to 220V-N, the + pin is connected to the anode of the light-emitting diode LED1, and the cathode of LED1 is grounded through a series resistor and capacitor. The EMI of U1 The GND pin is connected to the anode of the light-emitting diode LED1 through capacitor YC1; at the same time, the + pin of U1 is connected to the +IN pin of the DC / DC module U2, and the - pin of U1 is connected to the -IN pin of the DC / DC module U2 through resistor R19; the + pin and - pin of U1 are connected to the ST pin through resistors V1 and V2 respectively; the BOK pin of U1 is connected to the collector of the transistor Q1 through resistor R5, and the EN pin is connected to the base of the transistor Q1 through diode D4 and resistor R6 in turn. The base of the transistor Q1 is grounded through capacitors C21 and YC2, and the base of the transistor Q1 is connected to the PC pin of U2 through diode D5 and resistor R7 in turn. The EN pin of U1 is connected to capacitor C21 through diode D4 and resistor R6 in turn; the output end of U2 is connected to the output rectifier and filter circuit unit.

[0008] Furthermore, the positive input end of the optocoupler U8 is connected to the external control signal terminal through the resistor RT1, and is grounded through the light-emitting diode LED2 and the resistor R10 in sequence. The positive output end of the optocoupler U8 is connected to the PC pin of U2.

[0009] Furthermore, the PR pin of the DC / DC module U2 is connected to the input end of the transformer T1, and the output end of the transformer T1 serves as a parallel bus reserved port.

[0010] Compared with the prior art, the power supply of the present invention has the following advantages:

[0011] (1) Due to the adoption of the above technical solution, the present invention has a simple circuit, a compact size, and a stable and controllable small 5V DC switching power supply;

[0012] (2) The power supply of the present invention adopts a modular circuit and has functions such as input overvoltage and overcurrent protection, output current limiting protection, and output short circuit protection.

[0013] (3) The present invention adopts the above technical solution to achieve remote control of the power switch.

[0014] (4) The power supply of the present invention adopts a board structure and can be directly inserted into the board cage of the camelback control system. It is easy to install and has a compact size. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a front view of the DC 5V output power supply according to an embodiment of the present invention;

[0017] Figure 2 This is a side view of the DC 5V output power supply according to an embodiment of the present invention;

[0018] Figure 3 This is a circuit diagram of a DC 5V output power supply according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] This application aims to solve the shortcomings of existing power supplies and provide a DC 5V output power supply. Figure 3 As shown, it includes an input rectifier module U1, a DC / DC module U2, an output rectifier filter circuit unit and a hot-swap circuit unit connected in sequence. The DC / DC module U2 and the optical coupler U8 form an external control port.

[0022] The model of the input rectifier module U1 is FARM1C21, and the model of the DC / DC module U2 is V300C5C100BL, wherein,

[0023] The N pin of the input rectifier module U1 is connected to the 220V-L terminal through the varistor Z1, the L pin is connected to 220V-N, the + pin is connected to the anode of the light-emitting diode LED1, the cathode of LED1 is grounded through a series resistor and capacitor, and the EMIGND pin of U1 is connected to the anode of the light-emitting diode LED1 through the capacitor YC1; at the same time, the + pin of U1 is connected to the +IN pin of the DC / DC module U2, and the - pin of U1 is connected to the -IN pin of the DC / DC module U2 through the resistor R19; the + pin of U1 The - and - pins are connected to the ST pin through resistors V1 and V2 respectively; the BOK pin of U1 is connected to the collector of transistor Q1 through resistor R5, the EN pin is connected to the base of transistor Q1 through diode D4 and resistor R6 in sequence, the base of transistor Q1 is grounded through capacitors C21 and YC2, the base of transistor Q1 is connected to the PC pin of U2 through diode D5 and resistor R7 in sequence, the EN pin of U1 is connected to capacitor C21 through diode D4 and resistor R6 in sequence; the output end of U2 is connected to the output rectifier and filter circuit unit.

[0024] The positive input end of the optocoupler U8 is connected to the external control signal terminal through the resistor RT1, and is grounded through the light emitting diode LED2 and the resistor R10 in sequence. The positive output end of the optocoupler U8 is connected to the PC pin of U2.

[0025] The PR pin of the DC / DC module U2 is connected to the input end of the transformer T1, and the output end of the transformer T1 serves as a parallel bus reserved port.

[0026] The working process of the DC 5V output power supply of this embodiment is as follows:

[0027] This solution uses AC220V as the input power source, with 220V-L and 220V-N as the input terminals of the power module. The 220V-L input terminal is connected to a fuse as an input voltage and current overload protection component. After the AC 220V voltage is input to the terminal block, it is connected to fuse F1, which is a 5A fuse. At the same time, varistor Z1 is connected to both ends of 220V-L and 220V-N. The varistor Z1 is model 10D431K and can provide input overvoltage protection. It is then connected to pins 1 and 2 of the input rectifier and filter module U1. U1's model is FARM1C21. U1's input voltage is AC180V to 264V, its output voltage is DC 300V, and its rated power is 500W. U1 integrates functions such as rectification and input overvoltage protection.

[0028] After rectification, U1 outputs DC 300V. At this time, the voltage between pins 9 and 5 of U1 is DC 300V. Pin 9 of U1 is connected to the anode of LED1, and the input indicator LED1 lights up. Resistors R3 and R4 can provide protection for LED1 to prevent LED1 from burning due to excessive current.

[0029] U1 output pins 9 and 5 are connected to resistors V1 and V2, both with a resistance of 200K. These resistors can serve as bleeder resistors for U1 and C1. U1's pin 8 (BOK) is the busbar normal signal pin, which can provide an early warning signal for power termination. The voltage on this pin is based on the negative output.

[0030] Under normal working conditions, the output voltage of U1 is normal, then the 2nd pin of U2 (PC pin) outputs a high-level voltage, connected to the resistor R7, R7 is connected to the anode of the rectifier diode D5, the cathode of D5 is connected to the control terminal of the transistor Q1, the transistor Q1 is turned on, the 8th pin of U1 is grounded through the resistor R5, and the voltage of the 8th pin of U1 is zero; when U2 is disabled, the 2nd pin is low, the voltage of the 8th pin of U1 is raised, and U1 is disabled; the 6th pin of U1 is connected to the anode of the diode D4, forming an enable control.

[0031] The model of U2 is V300C5C100BL. The input voltage of U2 is AC 180V~375V, the rated power is 100W, and the output voltage is DC 5V. At the same time, U2 has integrated output short-circuit protection, output overvoltage protection and other functions.

[0032] The input of U2 is input by U1, U1's 9th pin inputs U2's 1st pin (+IN), U1's 5th pin inputs U2's 4th pin (-IN), U2's output is positive (+OUT), and U2's output is negative (-OUT). One end of resistor R12 is connected to U2's 6th pin (SC pin), and the other end is connected to U2's 7th pin. This resistor is an upward adjustment resistor, which can ensure the stability of the power supply output power.

[0033] When the DC5V output of U2 is output, it is input into the filter inductor L1 after output filtering, and then passes through the filter capacitors C19 and C20, and enters the hot-swap circuit composed of U3 and Q2, so that the power supply has hot-swap function.

[0034] External control interface: The external control port is composed of optocoupler U8 and U2. When the terminal 18 is connected to a high level, the signal enters the input end of the optocoupler U8, and the output end of U8 is turned on. Therefore, pin 2 of U2 (PC pin) is grounded, and the level is pulled below 2.3V. U2 is disabled, and at the same time, the anode of the light-emitting diode LED2 is grounded, and the light-emitting diode LED2 stops working. At this time, the power output indicator LED2 goes out.

[0035] Pin 3 (PR) of U2 connects to the input of transformer T1. Transformer T1 transmits the collected signal to terminals J1-35 and J1-41, providing electrical isolation for the PR pin. J1-35 and J1-41 serve as parallel busbar ports and are used when power supplies need to be connected in parallel.

[0036] The power supply output of this embodiment is stable, and it adopts a board structure, and its appearance is as follows Figure 1 、 2 As shown, it can be directly inserted into the hump control system board cage, featuring easy installation and compact size. It is primarily used in railway hump control system power supply equipment, providing a stable DC 5V supply to powered equipment. This power supply features multiple protection functions to meet the requirements of diverse applications.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A DC 5V output power supply, characterized in that: It includes an input rectifier module U1, a DC / DC module U2, an output rectifier filter circuit unit and a hot-swap circuit unit connected in sequence, wherein the DC / DC module U2 and the optical coupler U8 form an external control port; The model of the input rectifier module U1 is FARM1C21, and the model of the DC / DC module U2 is V300C5C100BL. The N pin of the input rectifier module U1 is connected to the 220V-L terminal through the varistor Z1, the L pin is connected to 220V-N, the + pin is connected to the anode of the light-emitting diode LED1, and the cathode of LED1 is grounded through a series resistor and capacitor. The EMI of U1 The GND pin is connected to the anode of the light-emitting diode LED1 through the capacitor YC1; at the same time, the + pin of U1 is connected to the +IN pin of the DC / DC module U2, and the - pin of U1 is connected to the -IN pin of the DC / DC module U2 through the resistor R19; the + pin and - pin of U1 are connected to the ST pin through the resistor V1 and the resistor V2 respectively; the BOK pin of U1 is connected to the collector of the transistor Q1 through the resistor R5, and the EN pin is connected to the base of the transistor Q1 through the diode D4 and the resistor R6 in turn. The base of the transistor Q1 is grounded through the capacitors C21 and YC2, and the base of the transistor Q1 is connected to the PC pin of U2 through the diode D5 and the resistor R7 in turn. The EN pin of U1 is connected to the capacitor C21 through the diode D4 and the resistor R6 in turn; the output end of U2 is connected to the output rectifier and filter circuit unit; the power supply adopts a board structure.

2. A 5V DC output power supply according to claim 1, characterized in that: The positive input end of the optocoupler U8 is connected to the external control signal terminal through the resistor RT1, and is grounded through the light emitting diode LED2 and the resistor R10 in sequence. The positive output end of the optocoupler U8 is connected to the PC pin of U2.

3. A 5V DC output power supply according to claim 1, characterized in that: The PR pin of the DC / DC module U2 is connected to the input end of the transformer T1, and the output end of the transformer T1 serves as a parallel bus reserved port.

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