Multi-phase self-adaptive input-isolation double-path output power supply module

Abstract

The utility model discloses a multi-phase self-adaptive input-isolation double-path output power supply module. The power supply module comprises an input phase selection rectification and surge suppression unit; a high-frequency filtering unit; a high-voltage bus unit; the high-voltage bootstrap starting unit is connected to the high-voltage bus unit; the flyback conversion control unit is connected to the high-voltage bootstrap starting unit; the primary side of the isolation transformer is connected to the flyback conversion control unit; the two-way rectifying and filtering unit is connected to two secondary windings of the isolation transformer and outputs direct-current power supplies with different voltage levels respectively; and the optocoupler closed-loop feedback unit is connected between the two-way rectification filtering unit and the flyback conversion control unit and comprises a soft tap phase compensation network. The utility model has the following beneficial effects: reliable starting and stable output under the combination of AV-V wide voltage range and single-phase / three-phase arbitrary line-neutral line are realized, the standby power consumption is obviously reduced, the conversion efficiency is improved, the anti-interference capability is enhanced, and the system design is simplified.

Description

Technical Field

[0001] The utility model relates to a multi-phase adaptive input-isolation dual-output power supply module. Background Art

[0002] With the continuous development of smart grids, smart energy meters, as important grid terminal equipment, are widely used in power systems. The power supply system of smart energy meters must be able to operate stably in a variety of complex grid environments. This is particularly true in industrial plants and remote suburban areas, where large voltage fluctuations and poor grid quality pose severe challenges to the power supply system.

[0003] At present, the smart energy meter power modules on the market have the following main deficiencies:

[0004] First, most power modules only support single-phase 220V input, which is insufficient for use in three-phase, four-wire meters, high-voltage meter cabinets, or in scenarios with large power grid fluctuations. When operating at low voltages (such as 57V) or high voltages (such as 440V), traditional power modules can easily break down or fail to start, causing metering equipment failure.

[0005] Secondly, traditional power modules generally use a starting resistor to directly draw power. This method continuously consumes power in standby mode, which is not only inefficient but also generates a lot of heat, reducing the reliability and service life of the system.

[0006] Third, existing power modules usually only provide a single voltage output and cannot directly meet the power supply requirements of different loads such as metering chips, MCUs, communication modules, and relays in smart meters. Additional DC-DC conversion circuits are often required, increasing system complexity and cost.

[0007] Fourth, in terms of electromagnetic compatibility, traditional power modules are not adequately designed to suppress common-mode noise and ensure isolation safety. They are easily affected by interference from grid surges, rapid electrical pulses, etc., which affects metering accuracy and equipment stability.

[0008] Therefore, there is an urgent need for a power supply module that can work reliably within a wide voltage range and multi-phase input conditions, and has low standby power consumption, multiple outputs, and high anti-interference capabilities to meet the usage requirements of the new generation of smart electricity meters. Utility Model Content

[0009] The purpose of this utility model is to provide a multi-phase adaptive input and isolated dual-output power supply module. This power supply module features a wide voltage input range, multi-phase adaptation, low standby power consumption, dual-channel differentiated output, and high anti-interference capability, meeting the reliable power supply requirements of smart energy meters in complex power grid environments.

[0010] The above technical objectives of the present invention are achieved through the following technical solutions:

[0011] A multi-phase adaptive input-isolated dual-output power supply module, comprising: an input phase selection rectification and surge suppression unit, for receiving a multi-phase input signal and performing rectification; a high-frequency filtering unit, connected to the output end of the input phase selection rectification and surge suppression unit; a high-voltage bus unit, comprising a capacitor and a voltage-sharing resistor network connected in series; a high-voltage bootstrap starting unit, connected to the high-voltage bus unit; a flyback conversion control unit, connected to the high-voltage bootstrap starting unit; an isolation transformer, the primary side of which is connected to the flyback conversion control unit; a dual-path rectification and filtering unit, connected to the two secondary windings of the isolation transformer, respectively outputting DC power supplies of different voltage levels; an optocoupler closed-loop feedback unit, connected between the dual-path rectification and filtering unit and the flyback conversion control unit, comprising a soft-tap phase compensation network.

[0012] The present invention is further configured as follows: the input phase selection rectification and surge suppression unit includes: multiple current limiting resistors, respectively connected to the multi-phase input ends; multiple varistors, respectively connected in parallel between the multi-phase input ends and the neutral line; a rectifier bridge, whose input end is connected to the output ends of the multiple current limiting resistors.

[0013] The utility model is further configured as follows: the high-voltage bus unit includes: two electrolytic capacitors connected in series; a plurality of voltage-equalizing resistors connected in parallel at both ends of each of the electrolytic capacitors; and a transient suppression diode connected in parallel at both ends of the series-connected electrolytic capacitors.

[0014] The utility model is further configured as follows: the high-voltage bootstrap starting unit includes: a high-voltage bootstrap chip, connected between the high-voltage bus unit and the flyback conversion control unit; an auxiliary power supply diode, connected between the auxiliary winding of the isolation transformer and the power input end of the flyback conversion control unit.

[0015] The utility model is further configured as follows: the flyback conversion control unit includes: a flyback control chip; a primary side surge suppression network, including an RC circuit and an RCD clamping circuit connected in parallel to the primary side of the isolation transformer.

[0016] The utility model is further configured as follows: the isolation transformer has a three-winding structure, including:

[0017] Primary winding; two secondary windings, corresponding to 12V output and 16V output respectively, with the winding ratio of primary:secondary 1:secondary 2 = 100:15:20.

[0018] The utility model is further configured as follows: the dual-path rectification and filtering unit includes: a first-path rectification and filtering circuit, including a Schottky diode and a π-type filtering network, outputting a 12V / 150mA DC power supply; a second-path rectification and filtering circuit, including a Schottky diode and a π-type filtering network, outputting a 16V / 400mA DC power supply.

[0019] The utility model is further configured as follows: the optical coupling closed-loop feedback unit includes: a precision voltage reference chip;

[0020] A photoelectric coupler, whose input end is connected to the precision voltage reference chip and whose output end is connected to the flyback conversion control unit; a soft-tap phase compensation network, comprising a soft-tap resistor connected to the secondary side of the photoelectric coupler and a resistor-capacitor-resistor parallel structure.

[0021] The utility model is further configured as follows: the high-frequency filtering unit includes: a differential mode filter capacitor; a common mode choke; and a Y-type safety capacitor.

[0022] The utility model is further configured to include: a safety isolation structure, including multiple Y2 safety capacitors, forming a dual Y2+ one PGND-N structure for reducing common-mode noise interference; wherein, the PCB creepage distance between the primary and secondary sides of the isolation transformer is greater than 6 mm.

[0023] In summary, the present invention has the following beneficial effects:

[0024] Wide input voltage adaptability: The "multi-phase adaptive power supply + series capacitance voltage division and voltage resistance" structure achieves input adaptability in a wide voltage range of AC57V-440V. Compared with the traditional single-phase 220V solution, the voltage adaptability range is expanded by about 8 times, and it can operate stably in various complex power grid environments.

[0025] Multi-phase adaptive capability: Adopting a three-phase parallel sampling structure, the three-phase input is connected in parallel to the rectifier bridge through a current-limiting resistor. It can work reliably under any phase-neutral combination, without the need for an external phase sequence detection circuit. It can still supply power normally when there is a phase loss or the phase sequence is wrong, greatly improving the robustness of the system.

[0026] Ultra-low standby power consumption: A μA-class high-voltage bootstrap startup system replaces the traditional high-resistance startup method, reducing standby power consumption to below 30mW. Compared with traditional solutions, standby loss is reduced by more than 80%, meeting the stringent energy consumption indicators of smart electricity meters and extending the service life of battery-powered equipment.

[0027] Advantages of dual-channel differentiated outputs: 12V / 150mA and 16V / 400mA are achieved through a three-winding transformer, directly meeting the power supply requirements of the metering MCU, RF module (12V), and relay / drive circuit (16V). This avoids external secondary DC-DC conversion, reduces system components by more than 15%, and reduces PCB area and system complexity.

[0028] High anti-interference capability: The series capacitor-balanced resistor-TVS multi-stage protection structure and surge suppression dual-channel clamp design provide up to 800V withstand voltage and 4kV surge level, greatly enhancing the anti-interference capability and lightning tolerance in harsh power grid environments.

[0029] Enhanced stability: A soft-tap phase compensation network improves loop stability, increasing the stability margin by 30%. This ensures stable operation over the full temperature range of -40°C to +85°C, and keeps output ripple below 120mV, meeting the high-precision measurement requirements of smart electricity meters.

[0030] Enhanced safety isolation: The device adopts a three-winding concentrically arranged transformer structure and a dual Y2+ and a PGND-N safety isolation design. The PCB creepage distance is greater than 6mm, providing reliable isolation performance, complying with the IEC61010-1 safety standard, and reducing the impact of common-mode interference on the measurement SOC.

[0031] Cost-effectiveness optimization: Using general industrial-grade components, compact structure, no special process required, easy mass production, reducing production and maintenance costs, and improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the overall structural block diagram of the multi-phase adaptive input-isolated dual-output power supply module of the utility model.

[0033] Reference numerals:

[0034] 400 - Input phase selection rectification and surge suppression unit; 401 - High-frequency filter unit; 402 - High-voltage bus unit; 403 - High-voltage bootstrap start-up unit; 404 - Flyback conversion control unit; 405 - Dual-path rectification and filtering unit; 406 - Optocoupler closed-loop feedback unit; R401-R403 - Current limiting resistors; RV401-RV403 - Varistors; D404-D407 - Rectifier bridge; C401-C403 - Differential mode filter capacitors; FL1 - Common mode choke; C404, C405 - Series electrolytic capacitors; R410 - R 415 - voltage-equalizing resistor; TVS2 - transient suppression diode; U13 - high-voltage bootstrap chip; D419 - auxiliary power supply diode; U14 - flyback control chip; R419, C406 - RC circuit; RCD418-D419 - RCD clamp circuit; T1 - isolation transformer; D420, D421 - Schottky diodes; U15 - precision voltage reference chip; U16 - optocoupler; R430 - soft tap resistor; C417, R431 - RC-resistor parallel structure; C419-C421 - Y2 safety capacitor. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0036] like Figure 1 As shown, the multi-phase adaptive input-isolated dual-output power supply module provided by the present invention includes an input phase selection rectification and surge suppression unit 400, a high-frequency filtering unit 401, a high-voltage bus unit 402, a high-voltage bootstrap starting unit 403, a flyback conversion control unit 404, an isolation transformer T1, a dual-path rectification and filtering unit 405 and an optocoupler closed-loop feedback unit 406.

[0037] The input phase selection rectification and surge suppression unit 400 includes multiple current-limiting resistors R401-R403, multiple varistors RV401-RV403, and rectifier bridges D401-D416. The current-limiting resistors R401-R403 are respectively connected to the three-phase input terminals A / B / C, with a resistance of 22Ω per phase, and are used to limit inrush current. The varistors RV401-RV403 are model MOV821K, connected in parallel between the three-phase input terminals and the neutral line N, to suppress surge voltage at the input terminals. The rectifier bridges D401-D416 convert three-phase AC power into pulsating DC power, and their input terminals are connected to the output terminals of the current-limiting resistors R401-R403. This structural design ensures normal power supply when any phase is available, realizing a multi-phase adaptive power supply function without the need for an external phase sequence detection circuit.

[0038] High-frequency filter unit 401, located after the rectifier unit, comprises differential-mode filter capacitors C401-C403, common-mode choke FL1, and Y-type safety capacitors. The differential-mode capacitors and common-mode choke form a π-type filter structure, effectively reducing electromagnetic interference caused by flyback switching. Common-mode choke FL1 is a UF9.8 model with an inductance of 9.8mH. Working together with a 4700pF Y-type capacitor, it meets CISPR22 Class B EMI standards.

[0039] The high-voltage busbar unit 402 includes two electrolytic capacitors C404 and C405 connected in series, multiple equalizing resistors R410-R415 and a transient suppression diode TVS2. The electrolytic capacitors C404 and C405 are both 18μF / 400V in specification and are connected in series to form a high-voltage storage unit. The equalizing resistors R410-R415 are 470kΩ resistors, which are connected in parallel at both ends of each electrolytic capacitor to ensure uniform voltage distribution. The transient suppression diode TVS2 is an SMBJ170A model, which is connected in parallel at both ends of the series electrolytic capacitors to provide transient protection. This "series capacitor-equalizing resistor-TVS" structure provides a withstand voltage of up to 800V in the same volume, can cope with a wide voltage input range of 57V-440V, and improves the 4kV surge level.

[0040] The high-voltage bootstrap startup unit 403 includes a high-voltage bootstrap chip U13 and an auxiliary power supply diode D419. The high-voltage bootstrap chip U13 is a DMHV-1400B model, connected between the high-voltage bus unit 402 and the flyback conversion control unit 404. When VDD<15V, the bus current is injected into the flyback control chip U14 in the form of μA-level pulses, and it automatically shuts down after the secondary VDD is established. The auxiliary power supply diode D419 is an M7 model, connected between the auxiliary winding of the isolation transformer T1 and the power input terminal of the flyback conversion control unit 404, and is used for continuous current supply after the secondary VDD is established. This design replaces the traditional high-resistance startup method, reducing standby losses by more than 80%, and controlling standby power consumption below 30mW.

[0041] The flyback conversion control unit 404 includes a flyback control chip U14 and a primary-side surge suppression network. The flyback control chip U14 is model OB8234T, adopts current-mode PWM control, operates at a frequency of 65kHz, and has a CS-side sampling current limit of 1A. It has a built-in frequency jitter function to reduce EMI, and the frequency automatically drops to 22kHz under light load to improve light-load efficiency. The primary-side surge suppression network includes an RC circuit (R419 is 510kΩ, C406 is 2.2nF) and an RCD clamp circuit (RCD418-D419, the diode is M7 model) connected in parallel to the primary side of the isolation transformer T1 to absorb MOSFET turn-off spikes and radio frequency noise. The RC circuit and TVS2 together form dual-channel clamping protection, significantly improving the lightning withstand capability.

[0042] Isolation transformer T1 features a three-winding structure, consisting of a primary and two secondary windings. The transformer uses an EF20-1613A core, with a winding ratio of 100:15:20 for primary:secondary 1:secondary 2, corresponding to 12V and 16V outputs, respectively. The three windings are arranged concentrically to keep leakage inductance below 3μH. The 16V winding is equipped with an additional 104kΩ RC snubber network to absorb high-frequency spikes. This structural design improves energy transmission efficiency and reduces EMI.

[0043] The dual-channel rectifier and filter unit 405 includes two rectifier and filter circuits. The first rectifier and filter circuit includes a Schottky diode D420 (ES1D model, 1A / 200V) and a π-type filter network, which outputs a 12V / 150mA DC power supply, mainly used to power the metering MCU and RF module. The second rectifier and filter circuit includes a Schottky diode D421 (ES2D model, 2A / 200V) and a π-type filter network, which outputs a 16V / 400mA DC power supply, mainly used to power relays and drive circuits. The use of Schottky diode rectification can reduce rectification losses, and the π-type filter network ensures that the output ripple is controlled below 120mV. This dual-channel differentiated output design avoids external secondary DC-DC conversion, reduces system components by more than 15%, and simplifies system design.

[0044] The optocoupler closed-loop feedback unit 406 includes a precision voltage reference chip U15, an optocoupler U16, and a soft-tap phase compensation network. The precision voltage reference chip U15 is a TL431A model, a 2.5V precision reference source, used for comparison and error amplification. The optocoupler U16 is an L816S model with a CTR of 50%. Its input is connected to the precision voltage reference chip U15, and its output is connected to the flyback conversion control unit 404 for isolated feedback signal transmission. The soft-tap phase compensation network includes a soft-tap resistor R430 (39kΩ) connected to the secondary side of the optocoupler U16 and a parallel resistor-capacitor-resistor structure (C417-R431), forming a "zero-pole" pair, which optimizes the transconductance gain-frequency curve and improves the loop stability margin by 30%. This design ensures precise control of the output voltage and system stability.

[0045] This device also includes a safety isolation structure, comprising multiple Y2 safety capacitors C419-C421 (1000pF / 4kV), forming a dual Y2+PGND-N structure to reduce common-mode noise interference and mitigate the impact of CMTI on the metering SOC. Furthermore, the PCB creepage distance between the primary and secondary sides of the isolation transformer T1 is greater than 6mm, complying with the IEC61010-1 safety standard and ensuring electrical safety.

[0046] The working principle of this utility model is as follows:

[0047] When any phase-neutral line combination within the range of AC57V-440V is externally connected, the input phase selection rectification and surge suppression unit 400 first performs surge suppression and rectification to convert the AC power into pulsating DC power.

[0048] The pulsating DC power is filtered by the high-frequency filter unit 401 and then enters the high-voltage bus unit 402 , where it stores energy in the electrolytic capacitors C404 and C405 to form a DC bus of approximately 310V.

[0049] During the startup phase, the U13 chip of the high-voltage bootstrap startup unit 403 injects bus current into the flyback control chip U14 in μA-level pulses to start it.

[0050] The U14 chip of the flyback conversion control unit 404 starts to work, generating a 65kHz PWM control signal to drive the MOSFET switch tube to operate according to the current mode control strategy.

[0051] The isolation transformer T1 transfers the primary energy to the two secondary windings through magnetic field coupling, achieving energy transmission and electrical isolation.

[0052] The dual-path rectifying and filtering unit 405 rectifies and filters the AC power of the two secondary windings into DC power outputs of 12V / 150mA and 16V / 400mA respectively.

[0053] After the secondary VDD is established, the auxiliary power supply diode D419 starts to provide working power to U14 through the auxiliary winding of the isolation transformer T1. At the same time, U13 is automatically shut down and enters an ultra-low power consumption state.

[0054] The optocoupler closed-loop feedback unit 406 compares the 16V output voltage with the TL431 reference and feeds back the error signal to U14 via the optocoupler U16, forming a closed-loop control to adjust the PWM duty cycle and achieve output voltage stability.

[0055] During the entire process, the primary-side surge suppression network and safety isolation structure continue to work to suppress switching spikes and common-mode noise, ensuring stable operation and electrical safety of the system.

[0056] The utility model solves the problems of narrow voltage adaptation range, high standby power consumption, single output, and weak anti-interference ability in the prior art through multi-phase adaptive input, series capacitor and voltage-sharing protection structure, μA-level high-voltage bootstrap starting system, dual-path differentiated isolation output structure and soft-tap phase compensation network, and realizes a dedicated isolated power supply for smart electricity meters with wide voltage input, low power consumption, high reliability and easy integration.

[0057] All components in this utility model utilize industrial temperature-grade standard components, resulting in a compact structure, no special processing required, and ease of mass production. Experimental testing has shown that within a temperature range of -40°C to +85°C and an input voltage of 57V to 440V, the steady-state output ripple is kept below 120mV, meeting the requirements of the State Grid Q / GDW1364-2013 smart energy meter standard. This demonstrates excellent practicality and promotional value.

[0058] In order to verify the above technical effects, this application aims to test the technical effects of the multi-phase adaptive input-isolated dual-output power supply module, focusing on verifying the wide voltage input adaptability, multi-phase adaptive capability, standby power consumption, dual-output performance and anti-interference capability.

[0059] 1. A comparative test method was used to compare the performance of the present invention with that of a traditional single-phase 220V power supply module, and the tests were conducted in a standard laboratory environment and a simulated field environment.

[0060] 2. Technical Effect Comparison Table

[0061] 3. Verification methods and processes

[0062] 3.1 Wide voltage adaptability test

[0063] Using an adjustable AC power supply, voltage scans were performed on the present invention and conventional modules within the range of 57V-440V. The startup voltage, shutdown voltage, output stability, and overvoltage protection point of each module were recorded. Efficiency, output ripple, and load regulation were measured at key points (57V, 220V, and 440V).

[0064] 3.2 Multi-phase Adaptive Ability Test

[0065] Simulate a three-phase four-wire power supply environment and test the operating conditions under A / N, B / N, C / N, and A / B / N combinations. Simulate phase sequence misconnection and phase loss conditions and record the response and output performance of the power module. Perform interphase interference tests to verify the degree of mutual influence.

[0066] 3.3 Standby power consumption test

[0067] A precision power analyzer was used to measure the standby power consumption of the two modules under no-load and light-load (10%) conditions. An infrared thermal imager was used to record the hotspot distribution of the two modules in a long-term (48-hour) standby state. The peak current and energy consumption during startup were measured.

[0068] 3.4 Output performance test

[0069] The voltage accuracy, cross-regulation, and load transient response of the dual outputs were measured. Testing was conducted over the full temperature range of -40°C to +85°C, and the output change rate was recorded. The overall efficiency and PCB area were compared between a traditional solution requiring an external DC-DC converter and the present invention.

[0070] 3.5 Anti-interference ability test

[0071] Conduct 4kV surge tests, electrical fast pulse tests, and electrostatic discharge tests according to the IEC61000-4 standard; measure common-mode interference suppression capability and CMTI (common-mode transient immunity) performance; and perform lightning strike simulation tests to evaluate system protection effectiveness.

[0072] 4. Verify the conclusion

[0073] Verification results show that the multi-phase adaptive input-isolated dual-output power supply module of the present invention has significant advantages over traditional single-phase power supply modules. Its wide voltage input range (57V-440V) meets the requirements of various complex power grid environments; its multi-phase adaptive capability enables it to operate reliably under any phase-neutral combination; its standby power consumption is less than 30mW, which is more than 80% lower than that of traditional solutions; its dual-channel differentiated output avoids secondary conversion and reduces system components; and its anti-interference ability and loop stability are significantly improved. This ensures the reliable power supply of smart electricity meters under complex power grid conditions, effectively solves the problems existing in existing technologies, and has significant technological advancement and practical value.

Claims

1. A multi-phase adaptive input-isolated dual-output power supply module, characterized in that: include: An input phase selection rectification and surge suppression unit (400) is used to receive a multi-phase input signal and perform rectification; A high-frequency filtering unit (401) connected to the output end of the input phase selection rectification and surge suppression unit (400); A high-voltage busbar unit (402) includes capacitors (C404, C405) connected in series and a voltage-equalizing resistor network (R410-R415); A high-voltage bootstrap starting unit (403), connected to the high-voltage bus unit (402); A flyback conversion control unit (404) connected to the high-voltage bootstrap start-up unit (403); an isolation transformer (T1), the primary side of which is connected to the flyback conversion control unit (404); A dual-path rectifier and filter unit (405) is connected to the two secondary windings of the isolation transformer (T1) and outputs DC power supplies of different voltage levels respectively; An optical coupler closed-loop feedback unit (406) is connected between the dual-path rectification and filtering unit (405) and the flyback conversion control unit (404), and includes a soft-tap phase compensation network.

2. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The input phase selection rectification and surge suppression unit (400) comprises: A plurality of current limiting resistors (R401-R403) are respectively connected to the multi-phase input terminals; A plurality of varistors (RV401-RV403) are respectively connected in parallel between the multi-phase input terminal and the neutral line; The rectifier bridge (D401-D416) has an input end connected to the output ends of the multiple current-limiting resistors (R401-R403).

3. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The high-voltage bus unit (402) comprises: Two electrolytic capacitors connected in series (C404, C405); A plurality of voltage-equalizing resistors (R410-R415) are connected in parallel to both ends of the electrolytic capacitors (C404, C405); A transient voltage suppressor diode (TVS2) is connected in parallel to both ends of the series electrolytic capacitors (C404, C405).

4. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The high-voltage bootstrap startup unit (403) comprises: A high-voltage bootstrap chip (U13) is connected between the high-voltage bus unit (402) and the flyback conversion control unit (404); An auxiliary power supply diode (D419) is connected between the auxiliary winding of the isolation transformer (T1) and the power input terminal of the flyback conversion control unit (404).

5. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The flyback conversion control unit (404) comprises: Flyback control chip (U14); The primary side surge suppression network comprises an RC circuit (R419, C406) and an RCD clamping circuit (RCD418-D419) connected in parallel to the primary side of the isolation transformer (T1).

6. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The isolation transformer (T1) has a three-winding structure and comprises: Primary winding; The two secondary windings correspond to 12V output and 16V output respectively, and the winding ratio is primary: secondary 1: secondary 2 = 100:15:

20.

7. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The dual-path rectifying and filtering unit (405) comprises: The first rectifier filter circuit includes a Schottky diode (D420) and a π-type filter network, outputting a 12V / 150mA DC power supply; The second rectifier filter circuit includes a Schottky diode (D421) and a π-type filter network, and outputs a 16V / 400mA DC power supply.

8. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The optical coupling closed-loop feedback unit (406) comprises: Precision voltage reference chip (U15); A photoelectric coupler (U16) having an input end connected to the precision voltage reference chip (U15) and an output end connected to the flyback conversion control unit (404); a soft tap phase compensation network comprising a soft tap resistor (R430) connected to the secondary side of the photoelectric coupler (U16) and a resistor-capacitor-resistor parallel structure (C417, R431).

9. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: The high-frequency filtering unit (401) comprises: differential mode filtering capacitors (C401-C403); a common mode choke (FL1); and a Y-type safety capacitor.

10. The multi-phase adaptive input-isolated dual output power supply module according to claim 1, characterized in that: Also includes: Safety isolation structure, including multiple Y2 safety capacitors (C419-C421), forming a dual Y2+ and a PGND-N structure to reduce common-mode noise interference; The PCB creepage distance between the primary and secondary sides of the isolation transformer (T1) is greater than 6 mm.

Images