An ac-dc power supply module

Abstract

The utility model discloses an AC converts DC power module relates to AC DC conversion power supply technical field, wherein, input protection unit connects 220V AC input, including pressure sensitive resistance, rectification unit passes through rectifier diode and converts AC into DC, switch control unit passes through AC DC conversion chip and adjusts switch frequency, the primary side of transformer in isolation transformer unit is connected switch control unit, and the secondary side contains two electrical isolation independent windings, and two low voltage DCs are output respectively, super capacitor unit is parallelly connected in the output terminal of isolation transformer unit, and charges in constant current mode, the voltage of super capacitor output voltage dynamic stabilization to the preset working voltage range is stabilized unit, through the technical scheme of the utility model, output two isolated low voltage DC circuit, satisfy different electric equipment simultaneously, guarantee electric equipment internal crosstalk, strengthen redundancy, prevent the data loss of electric equipment caused by instantaneous power failure.

Description

Technical Field

[0001] This utility model relates to the field of AC-DC power conversion technology, and in particular to an AC-DC power module. Background Technology

[0002] Currently, in the fields of industrial control and intelligent equipment, reliable dual-channel isolated power supply modules are core components ensuring the continuous operation of critical equipment. Traditional AC-DC conversion solutions suffer from three systemic defects:

[0003] (1) Insufficient output redundancy: The mainstream single-channel output power supply cannot simultaneously meet the differentiated power supply requirements of the main control unit (requires 12V / 1A) and the sensing module (requires 9V / 0.5A), forcing the system to add a secondary step-down circuit, resulting in reduced energy efficiency and increased fault nodes.

[0004] (2) Lack of power outage protection mechanism: When a sudden power grid interruption occurs, the existing solution has a power outage response blind zone of ≥200ms, which can easily lead to data loss of industrial controllers and incomplete event records of edge computing devices.

[0005] Although some solutions attempt to use electrolytic capacitors for energy storage, they suffer from excessively high equivalent series resistance, making it difficult for the MCU to complete a full data storage cycle.

[0006] (3) Risk of voltage interference conduction: When the two outputs are designed to share a common ground (such as a typical non-isolated DC-DC scheme), the 12V power circuit will generate ripple interference to the 9V sensing circuit. Sudden load changes will cause the cross-regulation rate to deteriorate, which will directly reduce the effectiveness of high-precision ADC sampling.

[0007] Existing technological improvements are hampered by technical contradictions. For example, using dual independent transformers for physical isolation results in increased size and significantly higher costs. Digital control with multiple outputs sacrifices response speed, and voltage drops drastically under heavy loads. Using lithium titanate batteries for power-off protection suffers from drawbacks such as low-temperature failure and short cycle life.

[0008] The aforementioned pain points highlight the core contradiction in the power module field: how to achieve the triple technical goals of high-efficiency power conversion, dual-path electrical isolation, and millisecond-level power failure response within a compact space. Utility Model Content

[0009] To address the aforementioned issues, this utility model provides an AC-to-DC power supply module that outputs two isolated low-voltage DC circuits through rectification and step-down, simultaneously meeting the needs of different electrical devices, preventing crosstalk within the devices, enhancing redundancy, and setting a supercapacitor unit and a voltage regulator unit at one output position to ensure that there is still a backup power supply after a sudden power outage, preventing data loss of electrical devices caused by momentary power failure.

[0010] To achieve the above objectives, this utility model provides an AC-to-DC power supply module, comprising: an input protection unit, a rectifier unit, a switch control unit, an isolation transformer unit, a supercapacitor unit, and a voltage regulator unit;

[0011] The input protection unit is connected to a 220V AC input terminal, and the input protection unit includes a varistor;

[0012] The rectifier unit is connected to the input protection unit and converts AC power to DC power through rectifier diodes;

[0013] The switch control unit is connected to the rectifier unit, and the switching frequency is adjusted by the AC-DC conversion chip to achieve power control, satisfying the requirements of no-load energy saving and heavy-load high-power output.

[0014] The primary side of the transformer in the isolation transformer unit is connected to the switch control unit, and the secondary side contains two electrically isolated independent windings, which output two low-voltage DC power supplies that are not grounded.

[0015] The supercapacitor unit is connected in parallel to one of the output terminals of the isolation transformer unit, and is charged in constant current mode through this output.

[0016] The voltage stabilizing unit is connected to the output terminal of the supercapacitor unit, and dynamically stabilizes the supercapacitor output voltage to a preset operating voltage range.

[0017] In the above technical solution, preferably, the varistor is connected between the L terminal and the N terminal of the 220V AC input terminal.

[0018] In the above technical solution, preferably, the rectifier unit uses a full-bridge rectifier current constructed with rectifier diodes to convert AC power into DC power.

[0019] In the above technical solution, preferably, the two independent windings on the secondary side of the transformer output a first isolated low-voltage DC power of 12V and a second isolated low-voltage DC power of 9V, respectively.

[0020] In the above technical solution, preferably, the supercapacitor unit is connected in parallel to the output terminal of the second isolated low-voltage DC power supply, and the supercapacitor is charged with a current of 100mA while the 9V voltage is output.

[0021] In the above technical solution, preferably, the voltage stabilizing unit adopts a DC / DC voltage stabilizing chip to dynamically stabilize the output voltage of the supercapacitor to an 8V voltage range.

[0022] In the above technical solution, preferably, the supercapacitor unit includes three supercapacitors connected in series.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: by rectifying and stepping down the output of two isolated low-voltage DC circuits, it can simultaneously meet the needs of different electrical devices, prevent crosstalk within the electrical devices, enhance redundancy, and set a supercapacitor unit and a voltage regulator unit at one output position to ensure that there is still a backup power supply after a sudden power outage, preventing data loss of electrical devices caused by momentary power outage. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the working mode of an AC-to-DC power supply module disclosed in one embodiment of the present invention;

[0025] Figure 2 This is a circuit diagram of the input protection unit in an AC-to-DC power supply module disclosed in one embodiment of the present invention;

[0026] Figure 3 This is a circuit diagram of the rectifier unit in an AC-to-DC power supply module disclosed in one embodiment of the present invention;

[0027] Figure 4 This is a circuit diagram of the switch control unit in an AC-to-DC power supply module disclosed in one embodiment of the present invention;

[0028] Figure 5 This is a circuit diagram of the isolation transformer unit in an AC-to-DC power supply module disclosed in one embodiment of the present invention;

[0029] Figure 6 This is a circuit diagram of the supercapacitor unit in an AC-to-DC power supply module disclosed in one embodiment of the present invention.

[0030] Figure 7 This is a circuit diagram of the voltage regulator unit in an AC-to-DC power supply module disclosed in one embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] like Figure 1As shown, an AC-to-DC power supply module provided by this utility model includes: an input protection unit, a rectifier unit, a switch control unit, an isolation transformer unit, a supercapacitor unit, and a voltage regulator unit;

[0034] The input protection unit is connected to the 220V AC input terminal and includes a varistor.

[0035] The rectifier unit is connected to the input protection unit and converts AC power to DC power through rectifier diodes;

[0036] The switch control unit is connected to the rectifier unit. It adjusts the switching frequency through the AC-DC conversion chip to achieve power control, meeting the requirements of no-load energy saving and heavy-load high-power output.

[0037] In the isolation transformer unit, the primary side of the transformer is connected to the switch control unit, and the secondary side contains two electrically isolated independent windings, which output two low-voltage DC power supplies that are not grounded.

[0038] The supercapacitor unit is connected in parallel to one of the output terminals of the isolation transformer unit, and is charged in constant current mode from that output.

[0039] The voltage regulator unit is connected to the output terminal of the supercapacitor unit, and dynamically stabilizes the supercapacitor output voltage to the preset operating voltage range.

[0040] In this embodiment, two isolated low-voltage DC circuits are output through rectification and step-down to simultaneously meet the needs of different electrical devices, prevent crosstalk within the electrical devices, enhance redundancy, and set a supercapacitor unit and a voltage regulator unit at one output position to ensure that there is still a backup power supply after a sudden power outage, preventing data loss of electrical devices caused by momentary power failure.

[0041] Specifically, the entire power module works by rectifying and stepping down 220V AC power to output two isolated low-voltage DC circuits (12V and 9V). A supercapacitor and a DC voltage regulator are installed at the 9V output position to ensure that there is still backup power after a sudden power outage.

[0042] like Figure 2 As shown, in the above embodiment, preferably, the varistor is connected between the L terminal and the N terminal of the 220V AC input terminal to protect the equipment connected to the back end and prevent high voltage input. Its reference designation in the circuit diagram is RU1.

[0043] like Figure 3 As shown, in the above embodiment, preferably, the rectifier unit uses a full-bridge rectifier current constructed with rectifier diodes, and uses the single-phase conductivity of the rectifier diodes to convert AC power into DC power. The reference numbers in the circuit diagram are VD1, VD2, VD3, VD4, VD5, VD6, VD7, and VD8.

[0044] like Figure 4 As shown, in the above embodiment, preferably, the switch control unit uses an AC / DC conversion chip to control the switching frequency to output power, satisfying the functions of energy saving under no-load and providing sufficient output power under heavy load. The reference numeral in the circuit diagram is D1.

[0045] like Figure 5 As shown, in the above embodiment, preferably, the two independent windings on the secondary side of the transformer output a first isolated low-voltage DC power of 12V and a second isolated low-voltage DC power of 9V respectively. The transformer is labeled T1 in the circuit diagram. The two-way voltage isolation design solves the problem of crosstalk inside the electrical equipment and enhances redundancy.

[0046] like Figure 6 As shown, in the above embodiment, preferably, the supercapacitor unit is connected in parallel to the output terminal of the second isolated low-voltage DC power supply, charging the supercapacitor with a current of 100mA while outputting a 9V voltage. When the external input is disconnected, the power module will not instantly lose power. The power provided by the supercapacitor unit allows the device to complete data storage and event recording before power failure, ensuring product reliability.

[0047] like Figure 7 As shown, in the above embodiment, preferably, the voltage regulator unit adopts a DC / DC voltage regulator chip to dynamically stabilize the output voltage of the supercapacitor to an 8V voltage range, so as to ensure that the device can be provided with the required operating voltage even when the voltage of the supercapacitor is low. The DC / DC voltage regulator chip is labeled D2 in the circuit diagram.

[0048] like Figure 6 As shown, in the above embodiment, preferably, the supercapacitor unit includes three supercapacitors connected in series, and the supercapacitors are labeled C20, C21 and C22 in the circuit diagram.

[0049] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An AC-to-DC power supply module, characterized in that, include: Input protection unit, rectifier unit, switch control unit, isolation transformer unit, supercapacitor unit, and voltage regulator unit; The input protection unit is connected to a 220V AC input terminal, and the input protection unit includes a varistor; The rectifier unit is connected to the input protection unit and converts AC power to DC power through rectifier diodes; The switch control unit is connected to the rectifier unit, and the switching frequency is adjusted by the AC-DC conversion chip to achieve power control, satisfying both no-load energy saving and heavy-load high-power output. The primary side of the transformer in the isolation transformer unit is connected to the switch control unit, and the secondary side contains two electrically isolated independent windings, which output two low-voltage DC power supplies that are not grounded. The supercapacitor unit is connected in parallel to one of the output terminals of the isolation transformer unit, and is charged in constant current mode through this output. The voltage stabilizing unit is connected to the output terminal of the supercapacitor unit, and dynamically stabilizes the supercapacitor output voltage to a preset operating voltage range.

2. The AC-to-DC power supply module according to claim 1, characterized in that, The varistor is connected between the L terminal and the N terminal of the 220V AC input terminal.

3. The AC-to-DC power supply module according to claim 1, characterized in that, The rectifier unit uses a full-bridge rectifier built with rectifier diodes to convert AC power into DC power.

4. The AC-to-DC power supply module according to claim 1, characterized in that, The two independent windings on the secondary side of the transformer output 12V of first isolated low-voltage DC power and 9V of second isolated low-voltage DC power, respectively.

5. The AC-to-DC power supply module according to claim 4, characterized in that, The supercapacitor unit is connected in parallel to the output terminal of the second isolated low-voltage DC power supply, and charges the supercapacitor with a current of 100mA while outputting a 9V voltage.

6. The AC-to-DC power supply module according to claim 5, characterized in that, The voltage regulation unit uses a DC / DC voltage regulator chip to dynamically stabilize the output voltage of the supercapacitor to an 8V voltage range.

7. The AC-to-DC power supply module according to claim 5, characterized in that, The supercapacitor unit comprises three supercapacitors connected in series.

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