A DC regulated power supply circuit with strong anti-interference stability
By working in concert with the digital control module and the feedback regulation module, combined with input filtering and load detection, the stability and intelligent control of the DC regulated power supply in complex electromagnetic environments are solved. This achieves high anti-interference capability and real-time precise adjustment of the output voltage, making it suitable for industrial automation, communication equipment and precision electronic systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU TECH UNIV
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-30
AI Technical Summary
Existing DC regulated power supplies suffer from insufficient stability, slow dynamic response, and lack of intelligent control capabilities in complex electromagnetic environments. In particular, they exhibit insufficient output accuracy, slow adjustment speed, and limited anti-interference capabilities in scenarios with frequent load changes, large input voltage fluctuations, or strong electromagnetic interference.
The system employs a digital control module and a feedback regulation module working together, combined with an input filtering module and a load detection module. It achieves real-time monitoring and dynamic adjustment through components such as comparators and field-effect transistors. A multi-phase inductor-capacitor filter structure is introduced to filter out high-frequency noise. The digital control module replaces the traditional analog control method, supporting intelligent regulation.
It significantly improves the stability and anti-interference capability of the output voltage, meeting the high stability and intelligent regulation requirements of industrial automation, communication equipment and precision electronic systems, and ensuring the stable operation and load adaptability of the power supply in complex environments.
Smart Images
Figure CN224438826U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of DC regulated power supply technology, specifically, it relates to a DC regulated power supply circuit with strong anti-interference stability. Background Technology
[0002] As a core component in modern industrial control, communication equipment, and precision instruments, the performance of DC regulated power supplies directly affects the stability and reliability of the entire system. With technological advancements, DC regulated power supply circuits with anti-interference capabilities have been widely applied in various fields. However, in complex electromagnetic environments, existing DC regulated power supplies still have certain limitations, particularly in dynamic response speed, output stability, and intelligent control. For example, a time-based phase-controlled DC regulated power supply with publication number CN1806778B uses a 555 timer IC chip as the trigger core, combined with phase-controlled thyristors and other components to form the trigger circuit. While this improves anti-interference capability and operational stability to some extent, the design primarily relies on analog devices for phase control, lacking a real-time feedback adjustment mechanism for the output voltage. This can lead to output voltage instability under sudden load changes or large input voltage fluctuations. Furthermore, due to the absence of a digital control module, parameter adjustments rely on manual settings, making it difficult to meet the needs of modern intelligent systems for remote monitoring and adaptive adjustment.
[0003] On the other hand, the constant electric field active anti-interference method and its control device, disclosed in CN13328767B, creates a constant electric field by applying a DC voltage between the cable core and the shielding layer to counteract the influence of external electromagnetic interference on signal transmission. Although this method utilizes a DC regulated power supply to provide correction energy to enhance anti-interference capability, its core objective is to improve signal transmission quality rather than optimize the stability of the power supply itself. Therefore, this solution does not address specific technical implementation methods for internal noise suppression, ripple control, and comprehensive processing of multi-band electromagnetic interference, and cannot be directly applied to the design of high-precision DC regulated power supplies.
[0004] In summary, while existing DC regulated power supplies possess some anti-interference capabilities, they still exhibit significant shortcomings in dynamic response speed, output stability, and intelligent control under complex electromagnetic environments. These deficiencies make it difficult to meet the growing demands of industrial automation, communication equipment, and precision electronic systems for highly stable and robust DC power supplies. Particularly in scenarios with frequent load changes, large input voltage fluctuations, or strong electromagnetic interference, existing technologies often demonstrate insufficient output accuracy, slow adjustment speed, and limited anti-interference capabilities. Therefore, there is an urgent need to develop a novel DC regulated power supply circuit with strong anti-interference capabilities, stable output, and intelligent adjustment functions to overcome these problems and drive technological advancements in related fields. Utility Model Content
[0005] The purpose of this invention is to provide a strong anti-interference and stable DC regulated power supply circuit, which mainly solves the problems of insufficient stability, slow dynamic response speed and lack of intelligent control capability of existing DC regulated power supplies in complex electromagnetic environments.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] An anti-interference, highly stable DC regulated power supply circuit includes an input filter module, a high-frequency rectifier module connected to the input filter module, a digital control module connected to the high-frequency rectifier module, a feedback regulation module connected to the digital control module, an output voltage regulator module connected to the feedback regulation module, and a load detection module connected to the output voltage regulator module; wherein, the feedback regulation module is also connected to the digital control module, and the load detection module is connected to an external load; the digital control module includes comparators IC1 and IC2, both connected to the output terminal of the high-frequency rectifier module, a resistor R1 connected to the output terminal of comparator IC1, a field-effect transistor Q3 whose base is connected to the other end of resistor R1, and a... The output terminal of IC2 is connected to resistor R2; the base of MOSFET Q4 is connected to the other end of resistor R2; the sliding terminal of potentiometer VR3 is connected to the inverting input terminal of comparator IC1, with one fixed terminal connected to 5V and the other fixed terminal grounded; the sliding terminal of potentiometer VR4 is connected to the non-inverting input terminal of comparator IC2, with one fixed terminal connected to 5V and the other fixed terminal grounded; resistor R3 is connected to the drain of MOSFET Q3; and diode D2 is connected in parallel across resistor R3. The source of MOSFET Q3 is connected to the drain of MOSFET Q4, the source of MOSFET Q4 is grounded, and the negative terminal of diode D2 is connected in parallel with resistor R3 as the output terminal of the digital control module.
[0008] Furthermore, in this utility model, the input filtering module includes inductors L1, L2, and L3. One end of inductor L1 is connected to the first phase of the external input power supply, and the other end is connected to one end of capacitor C1. One end of inductor L2 is connected to the second phase of the external input power supply, and the other end is connected to one end of capacitor C2. One end of inductor L3 is connected to the third phase of the external input power supply, and the other end is connected to one end of capacitor C3. The other ends of capacitors C1, C2, and C3 are all grounded. The common terminal of inductor L1 and capacitor C1, the common terminal of L2 and capacitor C2, and the common terminal of L3 and capacitor C3 are connected to the input terminal of the high-frequency rectifier module.
[0009] Furthermore, in this utility model, the high-frequency rectification module includes rectifier bridges BD1, BD2, and BD3. The input terminal of rectifier bridge BD1 is connected to the output terminal of inductor L1, the input terminal of rectifier bridge BD2 is connected to the output terminal of inductor L2, and the input terminal of rectifier bridge BD3 is connected to the output terminal of inductor L3. The positive output terminal of rectifier bridge BD1 is connected to one end of capacitor C4, the positive output terminal of rectifier bridge BD2 is connected to one end of capacitor C5, and the positive output terminal of rectifier bridge BD3 is connected to one end of capacitor C6. The other ends of capacitors C4, C5, and C6 are all grounded. The negative output terminals of rectifier bridges BD1, BD2, and BD3 are connected and then connected to the inverting input terminal of comparator IC2 in the digital control module.
[0010] Furthermore, in this utility model, the feedback adjustment module includes a TL431 chip U2, a resistor R4 connected to the cathode pin of the chip U2, resistors R5 and R6 both connected to the other end of resistor R4, an electrolytic capacitor C7 whose positive terminal is connected to resistor R6 and whose negative terminal is grounded, an operational amplifier A6 whose non-inverting input terminal is connected to the positive terminal of the electrolytic capacitor C7, a variable resistor R7 whose one fixed terminal is connected to the non-inverting input terminal of operational amplifier A6 and whose other fixed terminal is grounded, an operational amplifier A7 whose non-inverting input terminal is connected to the free end of the variable resistor R7, and an inverting input terminal of operational amplifier A6. The resistor R8 is connected to both the inverting input and output terminals of operational amplifier A7, and the other end of the resistor R9 is connected to both the inverting input and output terminals of operational amplifier A7. The anode pin of chip U2 is connected to the positive terminal of a 5V voltage source, the other end of resistor R5 is connected to the negative terminal of the 5V voltage source, the other end of resistor R6 is grounded, the positive and negative power supply terminals of operational amplifier A7 are connected to the positive and negative terminals of the 5V voltage source respectively, the output terminal of operational amplifier A6 is connected to the output voltage regulator module, and the reference pin of chip U2 is connected to the negative terminal of D2 in the digital control module.
[0011] Furthermore, in this utility model, the output voltage regulator module includes a resistor R10 connected to the output terminal of operational amplifier A6, a resistor R11 connected to the other end of resistor R10 and grounded, an operational amplifier A8 whose inverting input terminal is connected to the common terminal of resistors R10 and R11, a resistor R12 connected to the inverting input terminal of operational amplifier A8, a capacitor C8 whose one end is connected to the other end of resistor R12 and grounded, a resistor R13 connected between the non-inverting input terminal and the output terminal of operational amplifier A8, a switch S2 connected to the inverting input terminal of operational amplifier A8, a capacitor C9 whose one end is connected to the other end of switch S2 and grounded, and a resistor R14 whose one end is connected to the common terminal of switch S2 and capacitor C8 and whose other end is connected to the output terminal of operational amplifier A8; wherein, the output terminal of operational amplifier A8 is also connected to the load detection module as the output terminal of the output voltage regulator module.
[0012] Furthermore, in this utility model, the load detection module includes a current detection unit, a temperature detection unit, and a voltage detection unit. The current detection unit includes a current transformer CT1, a resistor R15 connected to the output terminal of the current transformer CT1, and a capacitor C10 connected to the other end of the resistor R15. The temperature detection unit includes a thermistor RT1 and a resistor R16 connected to one end of the thermistor RT1. The voltage detection unit includes voltage divider resistors R17 and R18, and a capacitor C11 connected to the common terminal of the voltage divider resistors R17 and R18. The input terminal of the current transformer CT1 is connected to the external load. The other ends of the resistors R16 and R18 are grounded. The other ends of the capacitors C10 and C11 are grounded. The output terminals of the current transformer CT1 and the thermistor RT1 are connected to the non-inverting input terminal of the comparator IC1 in the digital control module. The other end of the voltage divider resistor R17 is connected to the input terminal of the digital control module.
[0013] Furthermore, in this invention, the inductors L1, L2, and L3 have the same inductance value, and the capacitors C1, C2, and C3 have the same capacitance value.
[0014] Furthermore, in this invention, the rated voltage and rated current parameters of the rectifier bridges BD1, BD2, and BD3 are the same.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] (1) The digital control module and feedback adjustment module (including TL431 chip, operational amplifier, etc.) and load detection module (current / temperature / voltage detection unit) of this utility model work together to monitor the load status (such as current change, temperature abnormality, voltage fluctuation) in real time and dynamically adjust the output through comparators, field effect transistors and other components, which solves the problem of unstable output when the load changes suddenly or the input voltage fluctuates in the prior art and greatly improves the stability of the output voltage.
[0017] (2) The input filtering module of this utility model adopts a multi-phase inductor-capacitor filtering structure (L1-L3 and C1-C3), and the inductor and capacitor parameters are the same, which can effectively filter out high-frequency noise and multi-band electromagnetic interference in the input power supply, and significantly improve the anti-interference ability of the power supply in complex electromagnetic environment.
[0018] (3) The introduction of digital control module (including comparators IC1 / IC2, potentiometers VR3 / VR4, etc.) in this utility model replaces the traditional analog control method, supports parameter adjustment through potentiometers, and provides a hardware foundation for subsequent integrated intelligent control (such as remote monitoring and adaptive adjustment), meeting the needs of industrial automation, precision electronic systems and other intelligent power supplies. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the circuit structure of the digital control module and the load detection module in this utility model.
[0020] Figure 2 This is a schematic diagram of the circuit structure of the input filtering module and the high-frequency rectification module in this utility model.
[0021] Figure 3 This is a schematic diagram of the circuit structure of the feedback regulation module and the output voltage regulator module in this utility model. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.
[0023] Example
[0024] This utility model relates to a highly stable DC regulated power supply circuit with strong anti-interference capabilities, and its specific implementation is described in detail with reference to the accompanying drawings. This circuit, through the coordinated operation of an input filtering module, a high-frequency rectification module, a digital control module, a feedback adjustment module, an output voltage regulation module, and a load detection module, achieves high anti-interference capability in complex electromagnetic environments, real-time and precise adjustment of the output voltage, and intelligent monitoring and feedback of the load status.
[0025] The input filtering module of this utility model consists of inductors L1, L2, and L3 and capacitors C1, C2, and C3, as follows: Figure 2 As shown. One end of inductor L1 is connected to the first phase of the external input power supply, and the other end is connected to one end of capacitor C1; one end of inductor L2 is connected to the second phase of the external input power supply, and the other end is connected to one end of capacitor C2; one end of inductor L3 is connected to the third phase of the external input power supply, and the other end is connected to one end of capacitor C3. The other ends of capacitors C1, C2, and C3 are all grounded. The common terminal of inductor L1 and capacitor C1, the common terminal of inductor L2 and capacitor C2, and the common terminal of inductor L3 and capacitor C3 are respectively connected to the input terminal of the high-frequency rectifier module. The input filtering module independently filters the three-phase input power supply through three sets of LC filter networks, effectively suppressing external high-frequency noise and electromagnetic interference signals, ensuring that the AC power entering the high-frequency rectifier module has high purity. In practical applications, the inductance values of inductors L1, L2, and L3 are the same, and the capacitance values of capacitors C1, C2, and C3 are also the same to ensure the consistency of the three-phase input filtering effect. This design can significantly reduce ripple voltage and harmonic interference in the input power supply, thereby improving the operational stability of subsequent modules.
[0026] In this embodiment, the high-frequency rectification module includes rectifier bridges BD1, BD2, and BD3, and capacitors C4, C5, and C6, as follows: Figure 2 As shown. The input terminal of rectifier bridge BD1 is connected to the output terminal of inductor L1, the input terminal of rectifier bridge BD2 is connected to the output terminal of inductor L2, and the input terminal of rectifier bridge BD3 is connected to the output terminal of inductor L3. The positive output terminal of rectifier bridge BD1 is connected to one end of capacitor C4, the positive output terminal of rectifier bridge BD2 is connected to one end of capacitor C5, and the positive output terminal of rectifier bridge BD3 is connected to one end of capacitor C6. The other ends of capacitors C4, C5, and C6 are all grounded. The negative output terminals of rectifier bridges BD1, BD2, and BD3 are connected and then connected to the inverting input terminal of comparator IC2 in the digital control module. The high-frequency rectification module converts the AC power processed by the input filtering module into stable DC power through a rectification and filtering circuit composed of three sets of rectifier bridges and capacitors. At the same time, capacitors C4, C5, and C6 perform preliminary filtering on the rectified DC power to reduce ripple voltage. In this embodiment, the rated voltage and rated current parameters of rectifier bridges BD1, BD2, and BD3 are identical to ensure the consistency and stability of the three-phase rectification. This design effectively reduces harmonic interference generated during rectification and ensures the stability of the output DC voltage.
[0027] In this embodiment, the core part of the digital control module is as follows: Figure 1As shown, the system includes comparators IC1 and IC2, resistors R1 and R2, field-effect transistors Q3 and Q4, potentiometers VR3 and VR4, resistor R3, and diode D2. The inputs of comparators IC1 and IC2 are both connected to the output of the high-frequency rectifier module. One end of resistor R1 is connected to the output of comparator IC1, and the other end is connected to the base of field-effect transistor Q3; one end of resistor R2 is connected to the output of comparator IC2, and the other end is connected to the base of field-effect transistor Q4. The source of field-effect transistor Q3 is connected to the drain of field-effect transistor Q4, and the source of field-effect transistor Q4 is grounded. The sliding terminal of potentiometer VR3 is connected to the inverting input of comparator IC1, with one fixed terminal connected to 5V and the other fixed terminal grounded; the sliding terminal of potentiometer VR4 is connected to the non-inverting input of comparator IC2, with one fixed terminal connected to 5V and the other fixed terminal grounded. One end of resistor R3 is connected to the drain of MOSFET Q3, and the other end is connected to the cathode of diode D2. Diode D2 is connected in parallel across resistor R3, and its cathode serves as the output terminal of the digital control module. The digital control module monitors and compares the DC voltage output from the high-frequency rectifier module in real time through comparators IC1 and IC2, and precisely adjusts the reference voltage signal by switching MOSFETs Q3 and Q4. Potentiometers VR3 and VR4 set the reference voltage values for comparators IC1 and IC2, thereby enabling flexible adjustment of the output voltage range. In actual operation, when the output voltage of the high-frequency rectifier module changes, comparators IC1 and IC2 output corresponding high and low level signals according to the preset reference voltage value, driving MOSFETs Q3 and Q4 to turn on or off, thus generating a stable reference voltage signal for subsequent modules.
[0028] In this embodiment, the feedback adjustment module is as follows: Figure 3As shown, the components include chip U2 (model TL431), resistors R4, R5, and R6, electrolytic capacitor C7, operational amplifiers A6 and A7, variable resistor R7, and resistors R8 and R9. The cathode pin of chip U2 is connected to the non-inverting input of operational amplifier A6 via resistor R4; one end of resistors R5 and R6 is connected to resistor R4, and the other end of resistor R6 is grounded; the positive terminal of electrolytic capacitor C7 is connected to resistor R6, and the negative terminal is grounded; the non-inverting input of operational amplifier A6 is connected to the positive terminal of electrolytic capacitor C7; one fixed terminal of variable resistor R7 is connected to the non-inverting input of operational amplifier A6, the other fixed terminal is grounded, and the free terminal is connected to the non-inverting input of operational amplifier A7; one end of resistor R8 is connected to the inverting input and output of operational amplifier A6, and the other end is connected to the inverting input of operational amplifier A7; one end of resistor R9 is connected to the inverting input of operational amplifier A7, and the other end is connected to the output of operational amplifier A7; the anode pin of chip U2 is connected to the positive terminal of a 5V voltage source, and the reference pin is connected to the negative terminal of diode D2 in the digital control module. The feedback adjustment module adjusts the output voltage in real time through a closed-loop feedback circuit formed by chip U2 and operational amplifiers A6 and A7. Electrolytic capacitor C7 filters out high-frequency noise in the feedback signal, and variable resistor R7 adjusts the gain of the feedback loop, thereby achieving precise control of the output voltage. In practical applications, chip U2 adjusts its output current according to load changes and the reference voltage signal. Operational amplifiers A6 and A7 further amplify and process this signal to generate an adjustment signal suitable for use by the output voltage regulator module.
[0029] In this embodiment, the output voltage regulator module is as follows: Figure 3As shown, the circuit includes resistors R10 and R11, operational amplifier A8, resistors R12, R13, and R14, capacitors C8 and C9, and switch S2. One end of resistor R10 is connected to the output of operational amplifier A6, and the other end is connected to one end of resistor R11, with the other end of resistor R11 grounded. The inverting input of operational amplifier A8 is connected to the common terminal of resistors R10 and R11. One end of resistor R12 is connected to the inverting input of operational amplifier A8, and the other end is connected to one end of capacitor C8, with the other end of capacitor C8 grounded. Resistor R13 is connected between the non-inverting input and output of operational amplifier A8. One end of switch S2 is connected to the inverting input of operational amplifier A8, and the other end is connected to one end of capacitor C9, with the other end of capacitor C9 grounded. One end of resistor R14 is connected to the common terminal of switch S2 and capacitor C8, and the other end is connected to the output of operational amplifier A8. The output of operational amplifier A8 also serves as the output of a DC regulated power supply circuit. The output voltage regulator module, through a voltage regulation circuit composed of operational amplifier A8 and its peripheral components, further smooths and stabilizes the signal from the feedback regulation module, thereby outputting a stable DC voltage. Switch S2 selects different capacitor values to adapt to different load requirements. In actual operation, operational amplifier A8 dynamically adjusts its output voltage according to changes in the input signal, ensuring that the final output DC voltage meets the load requirements.
[0030] In this embodiment, the load detection module is as follows: Figure 1 As shown, the system includes a current detection unit, a temperature detection unit, and a voltage detection unit. The current detection unit includes a current transformer CT1, a resistor R15, and a capacitor C10. The input terminal of CT1 is connected to the external load, and its output terminal is connected to resistor R15. The other end of R15 is connected to capacitor C10. The temperature detection unit includes a thermistor RT1 and a resistor R16. One end of RT1 is connected to resistor R16, and the other end is grounded. The voltage detection unit includes voltage divider resistors R17 and R18 and a capacitor C11. The common terminal of R17 and R18 is connected to capacitor C11, and the other end of C11 is grounded. The output terminals of the current transformer CT1 and the thermistor RT1 are connected to the non-inverting input terminal of comparator IC1 in the digital control module. The other end of the voltage divider resistor R17 is connected to the input terminal of the digital control module. The load detection module monitors the current, temperature, and voltage status of the load in real time through the current detection unit, temperature detection unit, and voltage detection unit, and feeds the monitoring results back to the digital control module to achieve adaptive adjustment in response to load changes. In practical applications, the current transformer CT1 detects changes in load current, the thermistor RT1 senses changes in load temperature, and the voltage divider resistors R17 and R18 measure changes in load voltage. This information is transmitted to the digital control module for dynamic adjustment of output voltage and current.
[0031] The technical solution of this utility model, through the specific design described above, achieves significant technical effects in actual operation. First, the input filtering module and high-frequency rectification module effectively suppress external electromagnetic interference, ensuring stable operation of the power supply in complex electromagnetic environments. Second, the digital control module and feedback regulation module significantly improve the stability of the output voltage through real-time monitoring and precise adjustment. Third, the load detection module can monitor the load status in real time, providing a basis for feedback regulation and enhancing the power supply's self-adaptive capability. Finally, the circuit structure is rationally designed, and the component selection is standardized, facilitating production and maintenance, and possessing high engineering application value.
[0032] This invention is applicable to fields such as industrial automation, communication equipment, and precision electronic systems, and performs particularly well in scenarios requiring high stability and strong anti-interference capabilities. For example, in industrial automated production lines, this circuit can provide stable and reliable power support for sensors and actuators, ensuring the normal operation of the equipment. In communication base stations, this circuit can provide high-quality DC power to critical equipment, avoiding communication interruptions caused by voltage fluctuations or interference. In medical equipment, this circuit can provide stable power to precision instruments, ensuring the accuracy of diagnosis and treatment. In summary, this invention provides a DC regulated power supply circuit with strong anti-interference capabilities, stable output, and intelligent adjustment functions, meeting the current needs of industrial automation, communication equipment, and precision electronic systems for high-performance DC power supplies.
[0033] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.
Claims
1. An anti-interference strong stable DC regulated power supply circuit, characterized in that, The system includes an input filtering module, a high-frequency rectification module connected to the input filtering module, a digital control module connected to the high-frequency rectification module, a feedback regulation module and a load detection module connected to the digital control module, and an output voltage regulator module connected to the feedback regulation module. The feedback regulation module is also connected to the digital control module, and the load detection module is connected to an external load. The digital control module includes comparators IC1 and IC2, both connected to the output of the high-frequency rectification module; a resistor R1 connected to the output of comparator IC1; a field-effect transistor Q3 whose base is connected to the other end of resistor R1; and a resistor R...
2. A field-effect transistor Q4 whose base is connected to the other end of resistor R2; a potentiometer VR3 whose sliding terminal is connected to the inverting input of comparator IC1, with one fixed terminal connected to 5V and the other fixed terminal grounded; a potentiometer VR4 whose sliding terminal is connected to the non-inverting input of comparator IC2, with one fixed terminal connected to 5V and the other fixed terminal grounded; a resistor R3 connected to the drain of field-effect transistor Q3; and a diode D2 connected in parallel across resistor R3. The source of field-effect transistor Q3 is connected to the drain of field-effect transistor Q4, the source of field-effect transistor Q4 is grounded, and the negative terminal of diode D2 connected in parallel with resistor R3 serves as the output terminal of the digital control module.
2. The anti-interference strong stable DC regulated power supply circuit according to claim 1, characterized in that, The input filtering module includes inductors L1, L2, and L3. One end of inductor L1 is connected to the first phase of the external input power supply, and the other end is connected to one end of capacitor C1. One end of inductor L2 is connected to the second phase of the external input power supply, and the other end is connected to one end of capacitor C2. One end of inductor L3 is connected to the third phase of the external input power supply, and the other end is connected to one end of capacitor C3. The other ends of capacitors C1, C2, and C3 are all grounded. The common terminal of inductor L1 and capacitor C1, the common terminal of L2 and capacitor C2, and the common terminal of L3 and capacitor C3 are connected to the input terminal of the high-frequency rectifier module.
3. The anti-interference strong stable DC regulated power supply circuit according to claim 2, characterized in that, The high-frequency rectification module includes rectifier bridges BD1, BD2, and BD3. The input terminal of rectifier bridge BD1 is connected to the output terminal of inductor L1, the input terminal of rectifier bridge BD2 is connected to the output terminal of inductor L2, and the input terminal of rectifier bridge BD3 is connected to the output terminal of inductor L3. The positive output terminal of rectifier bridge BD1 is connected to one end of capacitor C4, the positive output terminal of rectifier bridge BD2 is connected to one end of capacitor C5, and the positive output terminal of rectifier bridge BD3 is connected to one end of capacitor C6. The other ends of capacitors C4, C5, and C6 are all grounded. The negative output terminals of rectifier bridges BD1, BD2, and BD3 are connected and then connected to the inverting input terminal of comparator IC2 in the digital control module.
4. The anti-interference strong stable DC regulated power supply circuit according to claim 3, characterized in that, The feedback adjustment module includes a TL431 chip U2, a resistor R4 connected to the cathode pin of chip U2, resistors R5 and R6 both connected to the other end of resistor R4, an electrolytic capacitor C7 with its positive terminal connected to resistor R6 and its negative terminal grounded, an operational amplifier A6 with its non-inverting input connected to the positive terminal of electrolytic capacitor C7, a variable resistor R7 with one fixed terminal connected to the non-inverting input of operational amplifier A6 and the other fixed terminal grounded, an operational amplifier A7 with its non-inverting input connected to the free end of variable resistor R7, and one end connected to both the inverting input and output of operational amplifier A6. The resistor R8 is connected to the inverting input of operational amplifier A7 at one end, and the resistor R9 is connected to the output of operational amplifier A7 at the other end; wherein, the anode pin of chip U2 is connected to the positive terminal of the 5V voltage source, the other end of resistor R5 is connected to the negative terminal of the 5V voltage source, the other end of resistor R6 is grounded, the positive and negative power supply terminals of operational amplifier A7 are connected to the positive and negative terminals of the 5V voltage source respectively, the output of operational amplifier A6 is connected to the output voltage regulator module, and the reference pin of chip U2 is connected to the negative terminal of D2 in the digital control module.
5. The anti-jamming strong stabilized DC regulated power supply circuit according to claim 4, characterized in that, The output voltage regulator module includes a resistor R10 connected to the output terminal of operational amplifier A6, a resistor R11 connected to the other end of resistor R10 and grounded, an operational amplifier A8 whose inverting input terminal is connected to the common terminal of resistors R10 and R11, a resistor R12 connected to the inverting input terminal of operational amplifier A8, a capacitor C8 whose one end is connected to the other end of resistor R12 and grounded, a resistor R13 connected between the non-inverting input terminal and the output terminal of operational amplifier A8, a switch S2 connected to the inverting input terminal of operational amplifier A8, a capacitor C9 whose one end is connected to the other end of switch S2 and grounded, and a resistor R14 whose one end is connected to the common terminal of switch S2 and capacitor C8 and whose other end is connected to the output terminal of operational amplifier A8; wherein, the output terminal of operational amplifier A8 also serves as the output terminal of a DC regulated power supply circuit.
6. The anti-jamming strong stabilized DC regulated power supply circuit according to claim 5, characterized in that, The load detection module includes a current detection unit, a temperature detection unit, and a voltage detection unit. The current detection unit includes a current transformer CT1, a resistor R15 connected to the output terminal of the current transformer CT1, and a capacitor C10 connected to the other end of the resistor R15. The temperature detection unit includes a thermistor RT1 and a resistor R16 connected to one end of the thermistor RT1. The voltage detection unit includes voltage divider resistors R17 and R18, and a capacitor C11 connected to the common terminal of the voltage divider resistors R17 and R18. The input terminal of the current transformer CT1 is connected to the external load. The other ends of the resistors R16 and R18 are grounded. The other ends of the capacitors C10 and C11 are grounded. The output terminals of the current transformer CT1 and the thermistor RT1 are connected to the non-inverting input terminal of the comparator IC1 in the digital control module. The other end of the voltage divider resistor R17 is connected to the input terminal of the digital control module.
7. The anti-jamming strong stabilized DC regulated power supply circuit according to claim 6, characterized in that, The inductors L1, L2, and L3 have the same inductance value, and the capacitors C1, C2, and C3 have the same capacitance value.
8. The anti-jamming strong stabilized DC regulated power supply circuit according to claim 7, characterized in that, The rated voltage and rated current parameters of the rectifier bridges BD1, BD2, and BD3 are the same.