Low-ripple and high-integration-level power supply device for precise instrument

Abstract

The utility model belongs to the technical field of power supplies, and discloses a low-ripple and high-integration power supply for a precise instrument. The power supply device comprises a positive voltage circuit and a negative voltage circuit which are arranged on the same circuit board in parallel, and the positive voltage circuit and the negative voltage circuit respectively comprise a voltage transformation circuit, a rectifier bridge circuit, a first filter circuit, a first voltage stabilizing circuit, a second filter circuit and a second voltage stabilizing circuit which are electrically connected in sequence. And meanwhile, a virtual ground end is arranged at a corresponding position. On the basis, compared with the existing power supply suitable for the precise instrument, the power supply provided by the utility model is high in integration level and simple in circuit structure; and the output voltage is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of power supplies, in particular to a power supply for precision instruments with low ripple and high integration. Background Art

[0002] In order to meet the operation or detection requirements of high-precision experiments, the corresponding precision instruments need to have stable positive and negative power supplies.

[0003] However, the existing power supplies for precision instruments can only provide positive voltage or negative voltage. Therefore, generally, a precision instrument needs to be equipped with a positive voltage power supply and a negative voltage power supply at the same time. As a result, when the power supply is connected, the circuit connection is complicated, the power supply cost is high, and when an abnormality occurs, the abnormality cannot be quickly eliminated and resolved. At the same time, in the process of achieving a stable output of positive or negative voltage, it is only through a simple method of increasing the capacitor setting, resulting in the final output of either positive voltage or negative voltage failing to meet the stability requirements. Utility Model Content

[0004] The utility model aims to provide a highly integrated low-ripple power supply to improve the technical problems of the existing power supply suitable for precision instruments, such as complex circuit structure and inability to meet the stability requirements.

[0005] In order to achieve the above purpose, the utility model proposes the following technical solutions:

[0006] A low-ripple and highly integrated power supply for precision instruments, comprising a positive voltage circuit and a negative voltage circuit arranged in parallel on the same circuit board, wherein the positive voltage circuit and the negative voltage circuit respectively comprise a transformer circuit, a rectifier bridge circuit, a first filter circuit, a first voltage stabilizing circuit, a second filter circuit and a second voltage stabilizing circuit electrically connected in sequence;

[0007] The transformer circuit includes a transformer for converting the 220V AC voltage into a target AC voltage; the rectifier bridge circuit includes a rectifier bridge for converting the target AC voltage into a target DC voltage;

[0008] The first filter circuit comprises a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 which are sequentially connected in parallel; two ends of the first capacitor C1 are electrically connected to the first output end and the second output end of the rectifier bridge respectively, and a first virtual ground terminal is further provided at one end of the fourth capacitor C4 corresponding to the second output end of the rectifier bridge;

[0009] The first voltage stabilization circuit includes a low voltage dropout linear regulator, and the low voltage dropout linear regulator includes a voltage stabilization input terminal, a voltage stabilization output terminal and an ADJ terminal; wherein the voltage stabilization input terminal is electrically connected to a terminal of the fourth capacitor C4 corresponding to the first output terminal of the rectifier bridge;

[0010] The second filtering circuit includes a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, and a second resistor R2; the first resistor R1 is electrically connected to the second resistor R2, and two ends of the first resistor R1 are electrically connected to the voltage stabilization output terminal and the ADJ terminal respectively, and two ends of the second resistor R2 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively; two ends of the fifth capacitor C5 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively, and two ends of the sixth capacitor C6 are electrically connected to the voltage stabilization output terminal and the first virtual ground terminal respectively;

[0011] The second voltage stabilizing circuit includes a bidirectional voltage stabilizing diode, and two ends of the bidirectional voltage stabilizing diode are electrically connected to two ends of the sixth capacitor C6 respectively.

[0012] Further, it includes: a seventh capacitor C7, an eighth capacitor C8 and a second virtual ground terminal; the seventh capacitor C7 and the eighth capacitor C8 are connected in parallel, and one common terminal thereof is electrically connected to the second virtual ground terminal, and the other common terminal thereof is electrically connected to the bidirectional voltage regulator diode.

[0013] Furthermore, the first capacitor C1, the second capacitor C2, the fifth capacitor C5 and the sixth capacitor C6 are all polar capacitors, and the third capacitor C3 and the fourth capacitor C4 are all non-polar capacitors.

[0014] Furthermore, the ripple range of the power supply is: no more than 10mV.

[0015] Furthermore, the model of the low dropout linear regulator is: LT1085CT#PBF.

[0016] Further, it includes a gain voltage circuit; the gain voltage circuit includes a reference voltage circuit and a DAC voltage circuit electrically connected;

[0017] The reference voltage circuit is electrically connected to the second voltage stabilizing circuit, and includes: a reference voltage chip, a ninth capacitor C9, a tenth capacitor C10, and an eleventh capacitor C11; one end of the ninth capacitor C9 is electrically connected to the bidirectional voltage stabilizing diode and the VIN pin of the reference voltage chip at the same time, and the other end is electrically connected to the GND pin of the reference voltage chip and then grounded, one end of the tenth capacitor C10 is electrically connected to one end of the eleventh capacitor C11 and then grounded, the other end of the tenth capacitor C10 is electrically connected to the TRIM pin of the reference voltage chip, and the other end of the eleventh capacitor C11 is electrically connected to the VOUT pin of the reference voltage chip;

[0018] The DAC voltage circuit includes: a DAC chip and a twelfth capacitor C12, the SDI pin of the DAC chip is used to obtain a MOSI signal, the SCK pin is used to obtain an SCK signal, and the CS pin is used to obtain a CS signal; the REF pin is electrically connected to the VOUT pin of the reference voltage chip, and the REF pin is electrically connected to the VCC pin of the DAC chip and is grounded via the twelfth capacitor C12.

[0019] Furthermore, the model of the reference voltage chip is: REF5050IDR, and the model of the DAC chip is: LTC2602IMS8#PBF.

[0020] Furthermore, it includes a system control circuit; the system control circuit includes an encoder, a main control chip and a serial port screen;

[0021] The main control chip is simultaneously connected to the encoder, the DAC chip and the serial port screen for communication; wherein the main control chip obtains an external input signal through the encoder, converts the digital signal into an analog signal through the DAC chip, and displays the analog signal through the serial port screen.

[0022] Furthermore, it includes a shell, the circuit board is placed in the shell, and the serial port screen is embedded in the shell; the shell is also embedded with a corresponding communication port, and the type of the communication port is a Lemo four-core interface.

[0023] Furthermore, the rectifier bridge circuit includes: a thirteenth capacitor C13 and a fuse; one end of the fuse is electrically connected to the thirteenth capacitor C13, and the other end is electrically connected to the first input end of the rectifier bridge; the other end of the thirteenth capacitor C13 is electrically connected to the second input end of the rectifier bridge.

[0024] Beneficial effects:

[0025] This embodiment provides a highly integrated low-ripple power supply to improve the above technical defects of the existing power supply for precision instruments. Specifically, the power supply includes a positive voltage circuit and a negative voltage circuit arranged in parallel on the same circuit board, and the positive voltage circuit and the negative voltage circuit respectively include a transformer circuit, a rectifier bridge circuit, a first filter circuit, a first voltage stabilizing circuit, a second filter circuit and a second voltage stabilizing circuit electrically connected in sequence. Among them, the first filter circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 arranged in parallel in sequence; the two ends of the first capacitor C1 are electrically connected to the first output end and the second output end of the rectifier bridge respectively, and the fourth capacitor C4 is also provided with a first virtual ground end at one end corresponding to the second output end of the rectifier bridge. The first voltage stabilizing circuit includes a low-dropout linear regulator, and the low-dropout linear regulator includes a voltage stabilizing input end, a voltage stabilizing output end and an ADJ end; wherein the voltage stabilizing input end is electrically connected to one end of the fourth capacitor C4 corresponding to the first output end of the rectifier bridge. The second filtering circuit includes a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, and a second resistor R2; the first resistor R1 is electrically connected to the second resistor R2, and the two ends of the first resistor R1 are electrically connected to the voltage stabilizing output terminal and the ADJ terminal respectively, and the two ends of the second resistor R2 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively; the two ends of the fifth capacitor C5 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively, and the two ends of the sixth capacitor C6 are electrically connected to the voltage stabilizing output terminal and the first virtual ground terminal respectively. The second voltage stabilizing circuit includes a bidirectional voltage stabilizing diode, and the two ends of the bidirectional voltage stabilizing diode are electrically connected to the two ends of the sixth capacitor C6 respectively.

[0026] It can be seen that the technical solution integrates the positive voltage circuit and the negative voltage circuit on the same circuit board for parallel setting, which effectively reduces the complexity of the circuit connection process and the cost of the power supply itself. In order to improve the stability of the output voltage, first of all, considering that filtering isolation is of great significance in the initial stage of power input, the high-frequency noise and clutter in the input power supply are filtered out by the first filtering circuit to ensure that the subsequent circuit receives a relatively pure DC signal; at the same time, the corresponding isolation design can also effectively prevent the influence of external electromagnetic interference on the internal circuit, ensuring the stability of the power supply. Secondly, in order to achieve the output of positive and negative voltages, virtual ground technology is used in the circuit to set the virtual ground terminal. As a result, the "ground" potential in the circuit is no longer fixed at zero potential, but can be flexibly adjusted as needed. Not only the output of positive and negative voltages is achieved, but also the overall performance and stability of the circuit are improved. Furthermore, in order to achieve the function of outputting low-ripple positive and negative voltages, a high-performance low-voltage difference linear voltage regulator circuit is used in the circuit, so that the power loss can be reduced while ensuring voltage stability. At the same time, combined with the design of the filtering circuit, the ripple level of the output power supply can be further reduced. Finally, after the voltage stabilization circuit, a filter circuit is set again to further reduce the ripple component in the output power supply to effectively filter out the residual noise and clutter in the power supply output, so that the final output DC power supply has an extremely low ripple level. This low ripple feature is particularly important for electronic equipment that requires high precision and high stability.

[0027] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0028] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the teachings of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:

[0030] Figure 1 This is a circuit diagram of a power supply for precision instruments with low ripple and high integration as described in this embodiment;

[0031] Figure 2 is a schematic diagram of the gain voltage circuit described in this embodiment;

[0032] Figure 3 This is a schematic diagram of the housing structure of the low-ripple and highly integrated power supply for precision instruments described in this embodiment. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the utility model belongs.

[0034] The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and other similar words do not indicate a quantity limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprise" include the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] The inventors have discovered that the current power supplies suitable for precision instruments have the following defects: On the one hand, they can provide positive voltage or negative voltage, so generally a precision instrument needs to be equipped with a positive voltage power supply and a negative voltage power supply at the same time; resulting in complex circuit connections and high power supply costs when the power supply is connected. On the other hand, in the process of achieving stable output of positive or negative voltage, the final output voltage cannot meet the high stability requirements of precision instruments by simply increasing the capacitor setting. Based on this, the present embodiment aims to provide a low ripple and highly integrated power supply for precision instruments to simultaneously improve the above-mentioned technical defects.

[0036] The low-ripple and highly integrated power supply for precision instruments disclosed in this embodiment will be further specifically introduced below in conjunction with the embodiments shown in the accompanying drawings.

[0037] Combination Figure 1-2 As shown, the power supply includes a positive voltage circuit and a negative voltage circuit arranged in parallel on the same circuit board, and the positive voltage circuit and the negative voltage circuit respectively include a transformer circuit, a rectifier bridge circuit, a first filter circuit, a first voltage stabilizing circuit, a second filter circuit and a second voltage stabilizing circuit which are electrically connected in sequence.

[0038] When designing a specific circuit structure, the transformer circuit includes a transformer for converting a 220V AC voltage into a target AC voltage; the rectifier bridge circuit includes a rectifier bridge for converting the target AC voltage into a target DC voltage. In this embodiment, the transformer circuit converts a 220V AC voltage into a 14V DC voltage, which is then converted into a 19V DC voltage after being processed by the rectifier bridge circuit.

[0039] In order to improve the safety of the power supply when in use, preferably, the rectifier bridge circuit is provided to include: a thirteenth capacitor C13 and a fuse F; one end of the fuse F is electrically connected to the thirteenth capacitor C13, and the other end is electrically connected to the first input end of the rectifier bridge; the other end of the thirteenth capacitor C13 is electrically connected to the second input end of the rectifier bridge.

[0040] The first filter circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 which are sequentially connected in parallel. The two ends of the first capacitor C1 are electrically connected to the first output end and the second output end of the rectifier bridge, respectively, and the end of the fourth capacitor C4 corresponding to the second output end of the rectifier bridge is also provided with a first virtual ground end. In a specific implementation, the first capacitor C1 (2200μF, 50V) and the second capacitor C2 (2200μF, 50V) are both polar capacitors, and the third capacitor C3 (10μF) and the fourth capacitor C4 (100nF) are both non-polar capacitors.

[0041] The first voltage stabilization circuit includes a low voltage dropout linear regulator, which includes a voltage stabilization input terminal, a voltage stabilization output terminal and an ADJ terminal; wherein the voltage stabilization input terminal is electrically connected to an end of the fourth capacitor C4 corresponding to the first output terminal of the rectifier bridge.

[0042] The second filter circuit includes a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, and a second resistor R2; the first resistor R1 is electrically connected to the second resistor R2, and the two ends of the first resistor R1 are electrically connected to the voltage stabilization output terminal and the ADJ terminal respectively, and the two ends of the second resistor R2 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively; the two ends of the fifth capacitor C5 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively, and the two ends of the sixth capacitor C6 are electrically connected to the voltage stabilization output terminal and the first virtual ground terminal respectively. In this embodiment, the model of the low voltage difference linear regulator is: LT1085CT#PBF, and the fifth capacitor C5 (20μF) and the sixth capacitor C6 (150μF) are both polar capacitors.

[0043] The second voltage stabilizing circuit includes a bidirectional voltage stabilizing diode D, and two ends of the bidirectional voltage stabilizing diode D are electrically connected to two ends of the sixth capacitor C6 respectively.

[0044] It can be seen that, on the one hand, the positive voltage circuit and the negative voltage circuit of the present technical solution are integrated on the same circuit board and arranged in parallel, which effectively reduces the complexity of the circuit and the cost of the power supply.

[0045] On the other hand, in order to improve the stability of the output voltage, first of all, considering that filtering and isolation are of great significance in the initial stage of power input, the high-frequency noise and clutter in the input power supply are filtered out by the first filtering circuit to ensure that the subsequent circuit receives a relatively pure DC signal. At the same time, the corresponding isolation design can also effectively prevent the influence of external electromagnetic interference on the internal circuit, further ensuring the stability of the power supply. Secondly, in order to achieve the output of positive and negative voltages, the circuit adopts virtual ground technology to set the virtual ground terminal. As a result, the "ground" potential in the circuit is no longer fixed at zero potential, but can be flexibly adjusted as needed. Not only the output of positive and negative voltages is achieved, but also the overall performance and stability of the circuit are improved. Furthermore, in order to achieve the function of outputting low-ripple positive and negative voltages, a high-performance low-voltage difference linear voltage regulator circuit is used in the circuit, so that the power loss can be reduced while ensuring voltage stability. At the same time, combined with the design of the filtering circuit, the ripple level of the output power supply can be further reduced. Finally, after the voltage stabilizing circuit, the filtering circuit is set again to further reduce the ripple component in the output power supply to effectively filter out the residual noise and clutter in the power supply output, so that the final output DC power supply has an extremely low ripple level. Finally, the ripple range of the power supply in this embodiment is: no more than 10mV. This low ripple characteristic is particularly important for electronic devices that require high precision and high stability.

[0046] As a preferred implementation, in order to further improve the overall performance and stability of the circuit, the present embodiment sets a plurality of virtual ground terminals. As a specific implementation, it includes: a seventh capacitor C7, an eighth capacitor C8 and a second virtual ground terminal; the seventh capacitor C7 and the eighth capacitor C8 are connected in parallel, and one of their common terminals is electrically connected to the second virtual ground terminal, and the other common terminal is electrically connected to the bidirectional voltage regulator diode D.

[0047] As another implementation, the power supply described in this embodiment can also provide a high-precision gain voltage. Specifically, the power supply includes a gain voltage circuit. The gain voltage circuit includes an electrically connected reference voltage circuit and a DAC voltage circuit.

[0048] In the specific circuit design, the reference voltage circuit is electrically connected to the second voltage stabilizing circuit, including: a reference voltage chip, a ninth capacitor C9, a tenth capacitor C10 and an eleventh capacitor C11. Among them, one end of the ninth capacitor C9 is electrically connected to the bidirectional voltage stabilizing diode D and the VIN pin of the reference voltage chip at the same time, and the other end is electrically connected to the GND pin of the reference voltage chip and then grounded, one end of the tenth capacitor C10 is electrically connected to one end of the eleventh capacitor C11 and then grounded, the other end of the tenth capacitor C10 is electrically connected to the TRIM pin of the reference voltage chip, and the other end of the eleventh capacitor C11 is electrically connected to the VOUT pin of the reference voltage chip. The DAC voltage circuit includes: a DAC chip and a twelfth capacitor C12, the SDI pin of the DAC chip is used to obtain the MOSI signal, the SCK pin is used to obtain the SCK signal, and the CS pin is used to obtain the CS signal; the REF pin is electrically connected to the VOUT pin of the reference voltage chip, and the REF pin is electrically connected to the VCC pin of the DAC chip and is grounded through the twelfth capacitor C12. In a specific implementation, the model of the reference voltage chip is: REF5050IDR, and the model of the DAC chip is: LTC2602IMS8#PBF.

[0049] In order to perform corresponding signal control, the power supply also includes a system control circuit. The system control circuit includes an encoder, a main control chip and a serial port screen; the main control chip is simultaneously connected to the encoder, the DAC chip and the serial port screen; wherein the main control chip obtains an external input signal through the encoder, and converts the digital signal into an analog signal through the DAC chip, and displays the analog signal through the serial port screen.

[0050] Combination Figure 3As shown, based on the above circuit structure design, the power supply also includes a housing 1, the circuit board is placed in the housing 1, and the serial port screen is embedded in the housing. Specifically, the serial port screen 3 can be a liquid crystal screen or an OLED screen. A corresponding communication port 2 is also embedded in the housing, and specifically, the type of the communication port 2 is a Lemo four-core interface. In summary, the power supply finally obtained in this embodiment has a complete structure to meet the actual installation requirements, and the corresponding performance parameters are as follows to meet the actual application requirements: 1) Output voltage: ±12V; 2) Ripple: ≤10mV; 3) Input voltage: AC220V; 4) Gain voltage range: 0~5V; 5) Operating temperature: -60℃~60℃; 6) Storage temperature: -40℃~80℃; 7) Interface type: Lemo four-core.

[0051] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A low ripple and highly integrated power supply for precision instruments, characterized in that: It includes a positive voltage circuit and a negative voltage circuit which are arranged in parallel on the same circuit board, and the positive voltage circuit and the negative voltage circuit respectively include a transformer circuit, a rectifier bridge circuit, a first filter circuit, a first voltage stabilizing circuit, a second filter circuit and a second voltage stabilizing circuit which are electrically connected in sequence; The transformer circuit includes a transformer for converting the 220V AC voltage into a target AC voltage; the rectifier bridge circuit includes a rectifier bridge for converting the target AC voltage into a target DC voltage; The first filter circuit comprises a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 which are sequentially connected in parallel; two ends of the first capacitor C1 are electrically connected to the first output end and the second output end of the rectifier bridge respectively, and a first virtual ground terminal is further provided at one end of the fourth capacitor C4 corresponding to the second output end of the rectifier bridge; The first voltage stabilization circuit includes a low voltage dropout linear regulator, and the low voltage dropout linear regulator includes a voltage stabilization input terminal, a voltage stabilization output terminal and an ADJ terminal; wherein the voltage stabilization input terminal is electrically connected to a terminal of the fourth capacitor C4 corresponding to the first output terminal of the rectifier bridge; The second filtering circuit includes a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, and a second resistor R2; the first resistor R1 is electrically connected to the second resistor R2, and two ends of the first resistor R1 are electrically connected to the voltage stabilization output terminal and the ADJ terminal respectively, and two ends of the second resistor R2 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively; two ends of the fifth capacitor C5 are electrically connected to the ADJ terminal and the first virtual ground terminal respectively, and two ends of the sixth capacitor C6 are electrically connected to the voltage stabilization output terminal and the first virtual ground terminal respectively; The second voltage stabilizing circuit includes a bidirectional voltage stabilizing diode, and two ends of the bidirectional voltage stabilizing diode are electrically connected to two ends of the sixth capacitor C6 respectively.

2. The low-ripple and highly integrated power supply for precision instruments according to claim 1, characterized in that: include: A seventh capacitor C7, an eighth capacitor C8 and a second virtual ground terminal; the seventh capacitor C7 and the eighth capacitor C8 are connected in parallel, and one common terminal thereof is electrically connected to the second virtual ground terminal, and the other common terminal thereof is electrically connected to the bidirectional voltage regulator diode.

3. The low-ripple and highly integrated power supply for precision instruments according to claim 1, characterized in that: The first capacitor C1 , the second capacitor C2 , the fifth capacitor C5 , and the sixth capacitor C6 are all polar capacitors, and the third capacitor C3 and the fourth capacitor C4 are all non-polar capacitors.

4. The low-ripple and highly integrated power supply for precision instruments according to claim 1, characterized in that: The ripple range of the power supply is: no more than 10mV.

5. The low-ripple and highly integrated power supply for precision instruments according to claim 1, characterized in that: The model of the low dropout linear regulator is: LT1085CT#PBF.

6. The low-ripple and highly integrated power supply for precision instruments according to claim 1, characterized in that: A gain voltage circuit is included; the gain voltage circuit includes a reference voltage circuit and a DAC voltage circuit which are electrically connected; The reference voltage circuit is electrically connected to the second voltage stabilizing circuit, and includes: a reference voltage chip, a ninth capacitor C9, a tenth capacitor C10, and an eleventh capacitor C11; one end of the ninth capacitor C9 is electrically connected to the bidirectional voltage stabilizing diode and the VIN pin of the reference voltage chip at the same time, and the other end is electrically connected to the GND pin of the reference voltage chip and then grounded, one end of the tenth capacitor C10 is electrically connected to one end of the eleventh capacitor C11 and then grounded, the other end of the tenth capacitor C10 is electrically connected to the TRIM pin of the reference voltage chip, and the other end of the eleventh capacitor C11 is electrically connected to the VOUT pin of the reference voltage chip; The DAC voltage circuit includes: a DAC chip and a twelfth capacitor C12, the SDI pin of the DAC chip is used to obtain a MOSI signal, the SCK pin is used to obtain an SCK signal, and the CS pin is used to obtain a CS signal; the REF pin is electrically connected to the VOUT pin of the reference voltage chip, and the REF pin is electrically connected to the VCC pin of the DAC chip and is grounded via the twelfth capacitor C12.

7. The low-ripple and highly integrated power supply for precision instruments according to claim 6, characterized in that: The model of the reference voltage chip is: REF5050IDR, and the model of the DAC chip is: LTC2602IMS8#PBF.

8. The low-ripple and highly integrated power supply for precision instruments according to claim 6, characterized in that: It includes a system control circuit; the system control circuit includes an encoder, a main control chip and a serial port screen; The main control chip is simultaneously connected to the encoder, the DAC chip and the serial port screen for communication; wherein the main control chip obtains an external input signal through the encoder, converts the digital signal into an analog signal through the DAC chip, and displays the analog signal through the serial port screen.

9. The low-ripple and highly integrated power supply for precision instruments according to claim 8, characterized in that: It comprises a shell, the circuit board is placed in the shell, and the serial port screen is embedded in the shell; the shell is also embedded with a corresponding communication port, and the type of the communication port is a Lemo four-core interface.

10. The low-ripple and highly integrated power supply for precision instruments according to claim 1, characterized in that: The rectifier bridge circuit includes: a thirteenth capacitor C13 and a fuse; one end of the fuse is electrically connected to the thirteenth capacitor C13, and the other end is electrically connected to the first input end of the rectifier bridge; the other end of the thirteenth capacitor C13 is electrically connected to the second input end of the rectifier bridge.

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