An isolated low-noise power conversion circuit

Abstract

This utility model discloses an isolated low-noise power conversion circuit comprising: a conversion module U5, a voltage regulator chip U10, ferrite beads L1 and L2, capacitors C41, C42, and C34; pin 1 of the conversion module U5 is grounded, pin 2 is connected to a 24V DC power supply, pin 3 is connected to one end of ferrite bead L1, and pin 5 is connected to one end of ferrite bead L2; pins 1 and 2 of the voltage regulator chip U10 are connected to the other end of ferrite bead L1, and pin 5 is connected to the other end of ferrite bead L2; one end of capacitor C41 is connected to the other end of ferrite bead L1 and pins 1 and 2 of voltage regulator chip U10, and the other end is connected to one end of capacitor C42 and one end of capacitor C34; the other end of capacitor C42 is connected to the other end of ferrite bead L2 and pin 5 of voltage regulator chip U10; the other end of capacitor C34 is connected to pin 3 of voltage regulator chip U10; and pin 4 of voltage regulator chip U10 is connected to one end of capacitor C34.

Description

Technical Field

[0001] This utility model relates to the field of power conversion, specifically an isolated low-noise power conversion circuit. Background Technology

[0002] In electronic devices, many precision circuits (such as operational amplifiers and sensor modules) require a stable ±12V power supply, while the common power input is generally 24V DC. However, typical power conversion modules may have the following problems:

[0003] 1. High noise interference: High-frequency noise can affect the measurement accuracy or signal processing performance of precision circuits;

[0004] 2. Lack of isolation design: When voltage fluctuations or interference occur on the input side, they are particularly easy to be directly conducted to the output side, and may even damage the load equipment;

[0005] 3. Low integration: The power conversion module requires a large number of external filtering and voltage regulation components, resulting in a complex circuit layout;

[0006] 4. Insufficient stability: Fluctuations in input voltage have a significant impact on output voltage. In high-precision circuits (such as measuring instruments, sensor interfaces, precision amplifier circuits, etc.), this may have a significant impact on system performance. Utility Model Content

[0007] Purpose of the utility model: To provide an isolated low-noise power conversion circuit to solve the above-mentioned problems existing in the prior art.

[0008] Technical solution: An isolated low-noise power conversion circuit, comprising:

[0009] Conversion module U5, voltage regulator chip U10, ferrite bead L1, ferrite bead L2, capacitor C41, capacitor C42, capacitor C34;

[0010] Pin 1 of the conversion module U5 is grounded, pin 2 is connected to a 24V DC power supply, pin 3 is connected to one end of the ferrite bead L1, and pin 5 is connected to one end of the ferrite bead L2.

[0011] Pins 1 and 2 of the voltage regulator chip U10 are connected to the other end of the ferrite bead L1, and pin 5 is connected to the other end of the ferrite bead L2.

[0012] One end of capacitor C41 is connected to the other end of ferrite bead L1 and pins 1 and 2 of voltage regulator chip U10, and the other end is connected to one end of capacitor C42 and one end of capacitor C34.

[0013] The other end of the capacitor C42 is connected to the other end of the magnetic bead L2 and pin 5 of the voltage regulator chip U10;

[0014] The other end of the capacitor C34 is connected to pin 3 of the voltage regulator chip U10;

[0015] Pin 4 of the voltage regulator chip U10 is connected to one end of capacitor C34;

[0016] The other end of capacitor C41, one end of capacitor C42, one end of capacitor C34, and pin 4 of voltage regulator chip U10 are grounded.

[0017] This invention designs a conversion module U5 to convert an input 24V power supply into an isolated ±15V power output. A voltage regulator chip U10 then precisely regulates and suppresses the ±15V power output from the conversion module U5. Simultaneously, a ferrite bead is designed for noise filtering. Since the ferrite bead is a high-frequency suppression component, it converts high-frequency noise into heat energy, thus filtering the power supply noise and improving the purity of the ±15V power input to the voltage regulator chip U10. Multiple capacitors connected in parallel form a multi-stage filtering network. Compared with traditional power conversion module circuits, this application avoids the problems of high noise interference, lack of isolation, and low integration, thereby increasing the overall circuit stability.

[0018] In a further embodiment, capacitors C40 and C43 are respectively connected to pins 5 and 3 of the conversion module U5;

[0019] The ends of capacitors C40 and C43 that are furthest from pins 5 and 3 of the conversion module U5 are connected to each other and connected to pin 4 of the conversion module U5 and grounded.

[0020] The capacitor C40 is connected to one end of the magnetic bead L2 near pin 5 of the conversion module U5.

[0021] The capacitor C43 is connected to one end of the magnetic bead L1 near pin 3 of the conversion module U5.

[0022] The design of the ferrite bead converts the high-frequency noise from the ferrite bead power supply into heat energy, thereby achieving power supply noise filtering and improving the purity of the ±15V power input to the voltage regulator chip U10.

[0023] In a further embodiment, resistors R3, R4, R5, and R6 are also included;

[0024] One end of resistor R3 is connected to pin 10 of voltage regulator chip U10, and the other end is connected to one end of resistor R4 and pin 9 of voltage regulator chip U10.

[0025] One end of resistor R5 is connected to pin 8 of voltage regulator chip U10, and the other end is connected to one end of resistor R6 and pin 7 of voltage regulator chip U10.

[0026] The other end of the resistor R6 is connected to pin 6 of the voltage regulator chip U10.

[0027] In a further embodiment, capacitors C36, C37, C38, and C39 are also included;

[0028] One end of capacitor C36 is connected to pin 10 of voltage regulator chip U10, one end of capacitor C38, and one end of resistor R3. The other end of capacitor C36 is connected to one end of capacitor C37 and the other end of resistor R4 and grounded.

[0029] The other end of the capacitor C38 is connected to the other end of the resistor R3, one end of the resistor R4, and pin 9 of the voltage regulator chip U10;

[0030] One end of capacitor C39 is connected to the other end of resistor R5, one end of resistor R6, and pin 7 of voltage regulator chip U10. The other end of capacitor C39 is connected to capacitor C37, the other end of resistor R6, and pin 6 of voltage regulator chip U10.

[0031] In a further embodiment, pin 11 of the voltage regulator chip U10 is grounded.

[0032] In a further embodiment, the conversion module U5 is model URA2415YMD-10WR3.

[0033] In a further embodiment, the voltage regulator chip U10 is model TPS7A3901DSCR.

[0034] Beneficial Effects: This utility model discloses an isolated low-noise power conversion circuit. The circuit uses a conversion module U5 to convert an input 24V power supply into an isolated ±15V power output. A voltage regulator chip U10 then precisely regulates and suppresses the ±15V power output from the conversion module U5. Simultaneously, a ferrite bead is designed for noise filtering. Since the ferrite bead is a high-frequency suppression component, it converts high-frequency noise into heat energy, thus achieving power noise filtering and improving the purity of the ±15V power input to the voltage regulator chip U10. Multiple capacitors connected in parallel form a multi-stage filtering network. Compared with traditional power conversion module circuits, this application avoids the problems of high noise interference, lack of isolation, and low integration, thereby increasing the overall circuit stability. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of this utility model.

[0036] Figure 2 This is a schematic diagram of the working process of this utility model. Detailed Implementation

[0037] This application relates to an isolated low-noise power conversion circuit. Existing power conversion modules may have the following problems:

[0038] 1. High noise interference: High-frequency noise can affect the measurement accuracy or signal processing performance of precision circuits;

[0039] 2. Lack of isolation design: When voltage fluctuations or interference occur on the input side, they are particularly easy to be directly conducted to the output side, and may even damage the load equipment;

[0040] 3. Low integration: The power conversion module requires a large number of external filtering and voltage regulation components, resulting in a complex circuit layout;

[0041] 4. Insufficient stability: Fluctuations in input voltage have a significant impact on output voltage. In high-precision circuits (such as measuring instruments, sensor interfaces, precision amplifier circuits, etc.), this may have a significant impact on system performance.

[0042] This application is designed with a multi-level noise reduction mode: combining capacitor filtering (to filter out high-frequency noise), ferrite beads (to suppress electromagnetic interference) and low dropout voltage regulation (to reduce voltage ripple), which significantly reduces output noise and thus solves the above problems;

[0043] Compared with traditional power conversion circuits, this application has the following advantages:

[0044] Low noise characteristics: The output voltage noise is low, making it suitable for powering precision circuits such as operational amplifiers and sensors;

[0045] Safety isolation: Input and output are isolated to prevent input-side faults (such as overvoltage) from directly affecting the load and improve equipment safety;

[0046] High stability: Multi-stage voltage regulation and feedback adjustment ensure long-term stable output voltage and reduce the risk of circuit failure;

[0047] Miniaturized design: Integrating isolation conversion, voltage regulation, and filtering functions reduces external components, simplifies circuit design, and the integrated structure reduces external components, which is conducive to the miniaturization and weight reduction of the equipment.

[0048] The following detailed explanation uses specific implementation methods.

[0049] An isolated low-noise power conversion circuit includes:

[0050] Conversion module U5, voltage regulator chip U10, ferrite bead L1, ferrite bead L2, capacitor C41, capacitor C42, capacitor C34;

[0051] Pin 1 of the conversion module U5 is grounded, pin 2 is connected to a 24V DC power supply, pin 3 is connected to one end of the ferrite bead L1, and pin 5 is connected to one end of the ferrite bead L2.

[0052] Pins 1 and 2 of the voltage regulator chip U10 are connected to the other end of the ferrite bead L1, and pin 5 is connected to the other end of the ferrite bead L2.

[0053] One end of capacitor C41 is connected to the other end of ferrite bead L1 and pins 1 and 2 of voltage regulator chip U10, and the other end is connected to one end of capacitor C42 and one end of capacitor C34.

[0054] The other end of the capacitor C42 is connected to the other end of the magnetic bead L2 and pin 5 of the voltage regulator chip U10;

[0055] The other end of the capacitor C34 is connected to pin 3 of the voltage regulator chip U10;

[0056] Pin 4 of the voltage regulator chip U10 is connected to one end of capacitor C34;

[0057] The other end of capacitor C41, one end of capacitor C42, one end of capacitor C34, and pin 4 of voltage regulator chip U10 are grounded.

[0058] This invention designs a conversion module U5 to convert an input 24V power supply into an isolated ±15V power output. A voltage regulator chip U10 then precisely regulates and suppresses the ±15V power output from the conversion module U5. Simultaneously, a ferrite bead is designed for noise filtering. Since the ferrite bead is a high-frequency suppression component, it converts high-frequency noise into heat energy, thus filtering the power supply noise and improving the purity of the ±15V power input to the voltage regulator chip U10. Multiple capacitors connected in parallel form a multi-stage filtering network. Compared with traditional power conversion module circuits, this application avoids the problems of high noise interference, lack of isolation, and low integration, thereby increasing the overall circuit stability.

[0059] Compared with traditional power conversion circuits, this application has the following advantages:

[0060] Low noise characteristics: The output voltage noise is low, making it suitable for powering precision circuits such as operational amplifiers and sensors;

[0061] Safety isolation: Input and output are isolated to prevent input-side faults (such as overvoltage) from directly affecting the load and improve equipment safety;

[0062] High stability: Multi-stage voltage regulation and feedback adjustment ensure long-term stable output voltage and reduce the risk of circuit failure;

[0063] Miniaturized design: Integrating isolation conversion, voltage regulation, and filtering functions reduces external components, simplifies circuit design, and the integrated structure reduces external components, which is conducive to the miniaturization and weight reduction of the equipment.

[0064] Capacitors C40 and C43 are connected to pins 5 and 3 of the conversion module U5, respectively.

[0065] The ends of capacitors C40 and C43 that are furthest from pins 5 and 3 of the conversion module U5 are connected to each other and connected to pin 4 of the conversion module U5 and grounded.

[0066] The capacitor C40 is connected to one end of the magnetic bead L2 near pin 5 of the conversion module U5.

[0067] The capacitor C43 is connected to one end of the magnetic bead L1 near pin 3 of the conversion module U5.

[0068] The design of the ferrite bead converts the high-frequency noise from the ferrite bead power supply into heat energy, thereby achieving power supply noise filtering and improving the purity of the ±15V power input to the voltage regulator chip U10.

[0069] It also includes resistors R3, R4, R5, and R6;

[0070] One end of resistor R3 is connected to pin 10 of voltage regulator chip U10, and the other end is connected to one end of resistor R4 and pin 9 of voltage regulator chip U10.

[0071] One end of resistor R5 is connected to pin 8 of voltage regulator chip U10, and the other end is connected to one end of resistor R6 and pin 7 of voltage regulator chip U10.

[0072] The other end of the resistor R6 is connected to pin 6 of the voltage regulator chip U10.

[0073] It also includes capacitors C36, C37, C38, and C39;

[0074] One end of capacitor C36 is connected to pin 10 of voltage regulator chip U10, one end of capacitor C38, and one end of resistor R3. The other end of capacitor C36 is connected to one end of capacitor C37 and the other end of resistor R4 and grounded.

[0075] The other end of the capacitor C38 is connected to the other end of the resistor R3, one end of the resistor R4, and pin 9 of the voltage regulator chip U10;

[0076] One end of capacitor C39 is connected to the other end of resistor R5, one end of resistor R6, and pin 7 of voltage regulator chip U10. The other end of capacitor C39 is connected to capacitor C37, the other end of resistor R6, and pin 6 of voltage regulator chip U10.

[0077] Pin 11 of the voltage regulator chip U10 is grounded.

[0078] The conversion module U5 is model URA2415YMD-10WR3.

[0079] The voltage regulator chip U10 is model TPS7A3901DSCR.

[0080] Working principle description: The 24V power supply is isolated by the conversion module U5 and converted to ±15V output. Then, it is initially filtered by ferrite beads L1 and L2, capacitors C41, C42, C37, etc., and then sent to the voltage regulator chip U10 for precise voltage regulation and deep noise reduction. Finally, it outputs a low-noise, high-stability ±12V power supply through the output interface.

[0081] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. An isolated low noise power conversion circuit, characterized by, include: Conversion module U5, voltage regulator chip U10, ferrite bead L1, ferrite bead L2, capacitor C41, capacitor C42, capacitor C34; Pin 1 of the conversion module U5 is grounded, pin 2 is connected to a 24V DC power supply, pin 3 is connected to one end of the ferrite bead L1, and pin 5 is connected to one end of the ferrite bead L2. Pins 1 and 2 of the voltage regulator chip U10 are connected to the other end of the ferrite bead L1, and pin 5 is connected to the other end of the ferrite bead L2. One end of capacitor C41 is connected to the other end of ferrite bead L1 and pins 1 and 2 of voltage regulator chip U10, and the other end is connected to one end of capacitor C42 and one end of capacitor C34. The other end of the capacitor C42 is connected to the other end of the magnetic bead L2 and pin 5 of the voltage regulator chip U10; The other end of the capacitor C34 is connected to pin 3 of the voltage regulator chip U10; Pin 4 of the voltage regulator chip U10 is connected to one end of capacitor C34.

2. An isolated low noise power conversion circuit according to claim 1, characterized in that: Capacitors C40 and C43 are connected to pins 5 and 3 of the conversion module U5, respectively. The ends of capacitors C40 and C43 that are furthest from pins 5 and 3 of the conversion module U5 are connected to each other and connected to pin 4 of the conversion module U5 and grounded.

3. An isolated low noise power conversion circuit according to claim 1, characterized by: It also includes resistors R3, R4, R5, and R6; One end of resistor R3 is connected to pin 10 of voltage regulator chip U10, and the other end is connected to one end of resistor R4 and pin 9 of voltage regulator chip U10. One end of resistor R5 is connected to pin 8 of voltage regulator chip U10, and the other end is connected to one end of resistor R6 and pin 7 of voltage regulator chip U10. The other end of the resistor R6 is connected to pin 6 of the voltage regulator chip U10.

4. An isolated low noise power conversion circuit according to claim 1, characterized by: It also includes capacitors C36, C37, C38, and C39; One end of capacitor C36 is connected to pin 10 of voltage regulator chip U10, one end of capacitor C38, and one end of resistor R3. The other end of capacitor C36 is connected to one end of capacitor C37 and the other end of resistor R4 and grounded. The other end of the capacitor C38 is connected to the other end of the resistor R3, one end of the resistor R4, and pin 9 of the voltage regulator chip U10; One end of capacitor C39 is connected to the other end of resistor R5, one end of resistor R6, and pin 7 of voltage regulator chip U10. The other end of capacitor C39 is connected to capacitor C37, the other end of resistor R6, and pin 6 of voltage regulator chip U10.

5. The isolated low-noise power conversion circuit according to claim 1, characterized in that: The conversion module U5 is model URA2415YMD-10WR3.

6. An isolated low noise power conversion circuit according to claim 1, characterized by: The voltage regulator chip U10 is model TPS7A3901DSCR.

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