48V power supply module

Abstract

The utility model discloses a 48V power supply module which comprises two paths of input EMI filtering units, a DC / DC conversion unit, an output filtering unit, an output redundancy unit and an intelligent management unit MPU. The input end of the input EMI filtering unit is connected with the output end of the direct-current voltage, and the input EMI filtering unit is used for filtering the input voltage of the direct-current voltage; the output end of the input EMI filtering unit is connected with the input end of the DC / DC conversion unit; the input end of the output filtering unit is connected with the output end of the DC / DC conversion unit; the input end of the output redundancy unit is connected with the output end of the output filtering unit, and the output redundancy unit is also used for realizing output redundancy; the input end of the intelligent management unit MPU is connected with the output filtering unit and the input EMI filtering unit, the intelligent management unit MPU is used for collecting input voltage, collecting voltage and current output by an internal redundant circuit and collecting the temperature and the circuit fault state of the DC / DC conversion unit, and the intelligent management unit MPU is connected with an upper computer through an interface of a power supply RS485.

Description

Technical Field

[0001] This utility model relates to the field of power module technology, specifically a 48V power module. Background Technology

[0002] In modern electronic devices, stable power supply and wide-range voltage conversion are crucial. Modern power supplies are rapidly trending towards miniaturization, integration, intelligence, and environmental friendliness, leading to increasingly diverse power requirements across various industries. In the maritime field, power supplies, as vital power modules and conversion units for shipboard equipment, must not only meet military-grade electrical performance standards but also possess high reliability, wide-range conversion capabilities, and stable operation in complex environments. However, existing power modules suffer from issues such as insufficient electrical performance, inadequate conversion range, and insufficient electromagnetic interference suppression, particularly exhibiting unreliable operation under complex sea conditions including strong winds, high waves, and extreme temperatures, humidity, and salt spray. Therefore, developing a new 48V power module has become a pressing issue for those skilled in the art. Utility Model Content

[0003] This application provides a 48V power supply module, including: two input EMI filtering units, two DC / DC conversion units, two output filtering units, two output redundancy units, and two intelligent management units (MPUs);

[0004] The input terminal of the input EMI filter unit is connected to the output terminal of the DC voltage, and the input EMI filter unit is used to filter the input voltage of the DC voltage.

[0005] The output terminal of the input EMI filter unit is connected to the input terminal of the DC / DC converter unit, and the DC / DC converter unit is used to convert the high voltage output by the output terminal of the EMI filter unit into low voltage.

[0006] The input terminal of the output filtering unit is connected to the output terminal of the DC / DC conversion unit to filter the voltage ripple of the low voltage output by the DC / DC conversion unit so that the ripple size meets the ripple requirements of the load.

[0007] The input terminal of the output redundancy unit is connected to the output terminal of the output filter unit. The output redundancy unit is used to prevent the output voltage of the output filter unit from flowing back, and the output redundancy unit is also used to achieve output redundancy.

[0008] The input terminals of the intelligent management unit (MPU) are connected to the output filter unit and the input EMI filter unit, respectively. The MPU is used to collect input voltage, collect voltage and current output from internal redundant circuits, and collect temperature and circuit fault status of the DC / DC converter unit. The MPU is connected to the host computer through the RS485 power supply interface.

[0009] Optionally, the input EMI filtering unit includes a first input EMI filtering unit and a second input EMI filtering unit. The input terminals of the first input EMI filtering unit and the second input EMI filtering unit are respectively connected to a high-voltage power supply. The output terminals of the first input EMI filtering unit and the second input EMI filtering unit are respectively connected to an LC common-mode filter circuit, which consists of a filter inductor and a filter capacitor.

[0010] Optionally, the DC / DC conversion unit includes a first DC / DC conversion unit and a second DC / DC conversion unit. The first DC / DC conversion unit and the second DC / DC conversion unit are respectively provided with DC / DC converters. The DC / DC converters are provided with an output short-circuit module, an overcurrent protection module and an overheat protection module.

[0011] Optionally, the short-circuit module is used to reduce or reduce the output voltage to zero when a short circuit occurs in the branch.

[0012] The overcurrent protection module is used to reduce or return the output voltage to zero when an overcurrent occurs in the branch.

[0013] The overheat protection module is used for cutoff circuit protection, so that when each branch overheats severely, the output of that branch is shut down.

[0014] Optionally, the output filtering unit includes a first output filtering unit and a second output filtering unit, wherein the first output filtering unit and the second output filtering unit are respectively provided with LC filtering circuits.

[0015] Optionally, the output redundancy unit includes a first output redundancy unit and a second output redundancy unit. The first output redundancy unit and the second output redundancy unit are connected in parallel with the first DC / DC converter unit and the second DC / DC converter unit, respectively. An N-channel field-effect transistor and an ideal secondary controller are connected in series at the output terminals of the first DC / DC converter unit and the second DC / DC converter unit connected in parallel with the first output redundancy unit and the second output redundancy unit.

[0016] Optionally, the intelligent management unit (MPU) is equipped with a DA conversion circuit and a processor. The processor is connected to a host computer. The DA conversion circuit is connected to a voltage and current acquisition device, each output voltage and current acquisition device, and a temperature sensor. The output voltage and current acquisition device is used to acquire the voltage and current output of each branch. The voltage and current acquisition device is used to acquire the voltage and current input of each branch. The temperature sensor is used to acquire temperature information.

[0017] Optionally, the intelligent management unit (MPU) is also connected to a FLASH memory chip.

[0018] Optionally, the processor uses RS485.

[0019] The beneficial effects of this application are as follows:

[0020] 1. This utility model is equipped with two input EMI filter units, two DC / DC conversion units, two output filter units, two output redundancy units, and two intelligent management units (MPUs). The output EMI filter units input high voltage, which improves the range of output voltage. The two DC / DC conversion units, two output filter units, and two output redundancy units convert high voltage to low voltage, which improves the output power of the conversion and optimizes the stability of output voltage and current.

[0021] 2. The intelligent management unit (MPU) provided by this utility model collects the input voltage, the voltage and current of the internal dual-channel redundant output, the temperature of the DC / DC converter unit, and the fault status of the two channels. It transmits the data to the host computer through the power supply RS485 interface, completes the detection of power supply input voltage and current, output voltage and current, and temperature, and optimizes the troubleshooting and monitoring of faults and temperature problems during use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the 48V power supply module provided by this utility model.

[0023] Figure 2 A schematic diagram illustrating the communication principle of the intelligent management unit (MPU);

[0024] Figure 3 This is a schematic diagram of an LC filter circuit. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please refer to Figures 1 to 3 As shown, this application provides a 48V power supply module, including: two input EMI filtering units, two DC / DC conversion units, two output filtering units, two output redundancy units, and two intelligent management units (MPUs);

[0027] The input terminal of the input EMI filter unit is connected to the output terminal of the DC voltage, and the input EMI filter unit is used to filter the input voltage of the DC voltage.

[0028] The output terminal of the input EMI filter unit is connected to the input terminal of the DC / DC converter unit, and the DC / DC converter unit is used to convert the high voltage output by the output terminal of the EMI filter unit into low voltage.

[0029] The input terminal of the output filtering unit is connected to the output terminal of the DC / DC conversion unit to filter the voltage ripple of the low voltage output by the DC / DC conversion unit so that the ripple size meets the ripple requirements of the load.

[0030] The input terminal of the output redundancy unit is connected to the output terminal of the output filter unit. The output redundancy unit is used to prevent the output voltage of the output filter unit from flowing back, and the output redundancy unit is also used to achieve output redundancy.

[0031] The input terminals of the intelligent management unit (MPU) are connected to the output filter unit and the input EMI filter unit, respectively. The MPU is used to collect input voltage, collect voltage and current output from internal redundant circuits, and collect temperature and circuit fault status of the DC / DC converter unit. The MPU is connected to the host computer through the RS485 power supply interface.

[0032] The input EMI filtering unit includes a first input EMI filtering unit and a second input EMI filtering unit. The input terminals of the first input EMI filtering unit and the second input EMI filtering unit are respectively connected to a high-voltage power supply. The output terminals of the first input EMI filtering unit and the second input EMI filtering unit are respectively connected to an LC common-mode filter circuit. The LC common-mode filter circuit consists of a filter inductor and a filter capacitor.

[0033] The high-voltage power supply connected to the input EMI filter unit has a high-current, high-insertion-loss EMI filter at its input terminal to address electromagnetic compatibility design issues. An LC common-mode filter circuit is used, comprising a filter inductor and a filter capacitor. The filter inductor is an amorphous magnetic ring, and the filter inductor and filter capacitor form a π-type filter circuit.

[0034] In this application, the filter inductor is designed to be 2mH / 10A, and the entire filter is packaged into a finished product using high-voltage device manufacturing processes and located close to the input connector. This filtering method has shown good performance in other similar products. Simultaneously, during the electromagnetic compatibility design, attention was paid to the shielding of the input power line and the selection of the common-mode interference suppression grounding point location to prevent internal electromagnetic interference signals from being superimposed on the input power line through coupling paths, thus avoiding a reduction in the performance of the EMI filter.

[0035] The DC / DC conversion unit includes a first DC / DC conversion unit and a second DC / DC conversion unit. The first DC / DC conversion unit and the second DC / DC conversion unit are respectively provided with DC / DC converters. The DC / DC converters are provided with output short-circuit modules, overcurrent protection modules and overheat protection modules.

[0036] The short-circuit module is used to reduce or return the output voltage to zero when a short circuit occurs in a branch.

[0037] The overcurrent protection module is used to reduce or return the output voltage to zero when an overcurrent occurs in the branch.

[0038] The overheat protection module is used for cutoff circuit protection, so that when each branch overheats severely, the output of that branch is shut down.

[0039] The output filtering unit includes a first output filtering unit and a second output filtering unit, and the first output filtering unit and the second output filtering unit are respectively provided with LC filtering circuits.

[0040] It is worth noting that in order to reduce the ripple voltage in this application, a filter circuit is designed at the power supply output terminal. The peak value of the output ripple voltage of the DC-DC converter is about 250mV. The addition of an output low ripple filter circuit (LC filter circuit) can reduce the ripple voltage to below 120mV.

[0041] The output redundancy unit includes a first output redundancy unit and a second output redundancy unit. The first output redundancy unit and the second output redundancy unit are connected in parallel with the first DC / DC converter unit and the second DC / DC converter unit, respectively. An N-channel field-effect transistor and an ideal secondary controller are connected in series at the output terminals of the first DC / DC converter unit and the second DC / DC converter unit connected in parallel with the first output redundancy unit and the second output redundancy unit.

[0042] Please continue to refer to this. Figure 1As shown, the output redundancy unit uses output voltage adjustment to make the output voltage of the DC / DC converter units in each parallel redundant branch as consistent as possible. Simultaneously, each branch's DC / DC output terminal of the output redundancy unit is connected in series with an N-channel MOSFET and an ideal diode controller. This ensures that the power supply voltage load variation amplitude is small, prevents current backflow, and provides fault isolation. During operation, the DC / DC converter units in each branch are in a hot-standby state; if one branch fails and has no output, the remaining circuits can continue to operate normally.

[0043] The intelligent management unit (MPU) is equipped with a DA conversion circuit and a processor. The processor is connected to a host computer. The DA conversion circuit is connected to a voltage and current acquisition device, each output voltage and current acquisition device, and a temperature sensor. The output voltage and current acquisition device is used to acquire the voltage and current output of each branch. The voltage and current acquisition device is used to acquire the voltage and current input of each branch. The temperature sensor is used to acquire temperature information.

[0044] The intelligent management unit (MPU) is also connected to a FLASH memory chip.

[0045] The processor uses RS485.

[0046] It is worth noting that the intelligent management unit (MPU) monitors the input and output voltage, current, and temperature of the power supply in real time. Once the power supply output status or temperature exceeds the threshold (the alarm threshold can be set through a specific communication protocol or factory setting), it will simultaneously report a fault code to the host computer via the processor's RS485 communication.

[0047] When a high-voltage input is applied, it charges the capacitors inside the power supply. Without a suppression circuit, this can generate a very high inrush current. The starting current is mainly caused by the charging of the filter capacitors. At the moment of charging, the capacitors exhibit low impedance. When a high-voltage DC of 500V is input, the capacitors are charged through the power resistor. The value of the resistor determines the magnitude of the input starting current. A minimum power resistor of 20Ω should be selected to ensure that the starting current does not exceed 25A. Simultaneously, when the input reaches approximately 450V, the AUX pin outputs 12V, with a maximum output of 10mA, turning on V1 and enabling the DC / DC conversion unit 1 and DC / DC conversion unit 2, resulting in a low-voltage DC output and completing the input startup process.

[0048] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A 48V power supply module, characterized by, The utility model relates to a kind of dual-redundant DC / DC power supply, including: Two-way input EMI filter unit, two-way DC / DC conversion unit, two-way output filter unit, two-way output redundancy unit and two-way intelligent management unit MPU; The input end of the input EMI filter unit is connected with the output end of direct-current voltage, and the input EMI filter unit is used for filtering the input voltage of the direct-current voltage; The output end of the input EMI filter unit is connected with the input end of the DC / DC conversion unit, and the DC / DC conversion unit is used for converting the high-voltage electricity output by the output end of the EMI filter unit into low-voltage electricity. The input end of the output filter unit is connected with the output end of the DC / DC conversion unit, and the voltage ripple size of the low-voltage electricity output by the DC / DC conversion unit is filtered to meet the ripple demand of the load. The input end of the output redundancy unit is connected with the output end of the output filter unit, and the output redundancy unit is used for preventing the output voltage of the output filter unit from flowing backward, and the output redundancy unit is also used for realizing output redundancy. The input end of the intelligent management unit MPU is connected with the output filter unit and the input EMI filter unit respectively, and the intelligent management unit MPU is used for collecting input voltage, collecting voltage and current output by the internal redundancy circuit, collecting temperature and circuit fault state of the DC / DC conversion unit, and connecting with the upper computer through the interface of power supply RS485.

2. The 48V power module of claim 1, wherein, The input EMI filter unit includes a first input EMI filter unit and a second input EMI filter unit, and the input ends of the first input EMI filter unit and the second input EMI filter unit are respectively connected with high-voltage power supply.

3. The 48V power module of claim 2, wherein, The DC / DC conversion unit includes a first DC / DC conversion unit and a second DC / DC conversion unit, and the internal DC / DC converters of the first DC / DC conversion unit and the second DC / DC conversion unit are respectively provided with output short-circuit module, over-current protection module and over-heat protection module.

4. The 48V power module of claim 3, wherein, The short-circuit module is used for reducing or zeroing the output voltage when short circuit occurs in the branch; The over-current protection module is used for reducing or zeroing the output voltage when over-current occurs in the branch; The over-heat protection module is used for cutting off the circuit protection, so that the output of the branch is closed when the branch overheats.

5. The 48V power module of claim 4, wherein, The output filter unit includes a first output filter unit and a second output filter unit, and the first output filter unit and the second output filter unit are respectively provided with LC filter circuit.

6. The 48V power module of claim 5, wherein, The output redundancy unit comprises a first output redundancy unit and a second output redundancy unit, the first output redundancy unit and the second output redundancy unit are connected in parallel with the first DC / DC conversion unit and the second DC / DC conversion unit respectively, and an N-channel field effect tube and an ideal secondary controller are connected in series at the output end of the first DC / DC conversion unit and the second DC / DC conversion unit connected in parallel with the first output redundancy unit and the second output redundancy unit.

7. The 48V power module of claim 6, wherein, The DA conversion circuit and the processor are arranged on the intelligent management unit MPU, the processor is connected with the upper computer, the DA conversion circuit is connected with the voltage and current collector, the output voltage and current collector and the temperature sensor respectively, the output voltage and current collector is used for collecting the voltage and current output by each branch, the voltage and current collector is used for collecting the voltage and current input by each branch, and the temperature sensor is used for collecting temperature information.

8. The 48V power module of claim 7, wherein, The intelligent management unit MPU is further connected with a FLASH, and the FLASH is a storage chip.

9. The 48V power module of claim 7, wherein, The processor adopts RS485.

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