Power supply device, power supply board and test machine

Abstract

The application relates to the field of circuit design, in particular to a current expansion device of a power supply device, a power supply board and a testing machine. The power supply device is connected with an adjustable power supply, the voltage of the adjustable power supply is used to represent the gear of the output current of the power supply device; the current expansion device is connected with a current expansion power supply, the adjustable power supply and the output end of the power supply device, the voltage of the current expansion power supply is subtracted from the voltage sampled by the adjustable power supply, and the current used to represent the voltage after subtraction is amplified according to the current expansion ratio and then output to the output end of the power supply device. The power supply device and the current expansion device in the application adopt non-common rail power supplies, the load of the power supply can be reduced, and the power supply can be prevented from being damaged.

Description

Technical Field

[0001] This application relates to the field of circuit design, and in particular to a current amplification device, power board, and tester for a power supply device. Background Technology

[0002] Chip testing is a crucial step in chip manufacturing. By comparing the actual output with the expected output, the chip's functionality and performance are evaluated and determined. Chip testing typically involves applying an stimulus and then detecting the output signal; a power supply board can perform both the stimulus and detection functions. As chip testing requirements increase, the output current requirements of the power supply board also increase.

[0003] In the existing technology, the power supply board uses a method of sharing a power rail for the current amplification device and power supply components to achieve power supply. However, using the same power rail will increase the power supply load of the current power rail, which can easily lead to power supply damage. Utility Model Content

[0004] Therefore, it is necessary to provide a current amplification device, a power board, and a testing machine for power devices to address the aforementioned technical problems.

[0005] In a first aspect, embodiments of this application propose a current amplification device for a power supply device. The power supply device is connected to an adjustable power supply, and the voltage of the adjustable power supply is used to characterize the output current level of the power supply device. The current amplification device is connected to the current amplification power supply, the adjustable power supply, and the output terminal of the power supply device. It is used to subtract the voltage sampled by the adjustable power supply from the voltage of the current amplification power supply, and amplify the current used to characterize the subtracted voltage according to the current amplification ratio before outputting it to the output terminal of the power supply device.

[0006] In some embodiments, the flow amplification device includes:

[0007] An operational amplifier circuit is connected to the adjustable power supply and the current-amplifying power supply, and is used to subtract the voltage sampled by the adjustable power supply from the voltage of the current-amplifying power supply.

[0008] The current amplification circuit is connected to the operational amplifier circuit, the current amplification power supply, and the output terminal of the power supply device. It is used to amplify the current used to characterize the voltage after subtraction according to the current amplification ratio and output it to the output terminal of the power supply device.

[0009] In some embodiments, the flow amplification device further includes:

[0010] A clamping circuit, connected between the operational amplifier circuit and the current amplification circuit, is used to clamp the current representing the voltage after subtraction, so as to clamp the output current of the power supply device.

[0011] In some embodiments, the operational amplifier circuit includes:

[0012] A sampling circuit, connected to the adjustable power supply, is used to sample the current of the adjustable power supply;

[0013] An operational amplifier, connected to the sampling circuit and the current amplification power supply, is used to subtract the sampling voltage from the voltage of the current amplification power supply.

[0014] In some embodiments, the operational amplifier circuit further includes:

[0015] The first filter circuit is connected between the first terminal of the sampling circuit and the inverting input terminal of the operational amplifier;

[0016] The second filter circuit is connected between the second terminal of the sampling circuit and the non-inverting input terminal of the operational amplifier;

[0017] The third filter circuit is connected between the inverting input and the non-inverting input of the operational amplifier.

[0018] In some embodiments, the operational amplifier circuit further includes:

[0019] The fourth filter circuit is connected between the positive power supply of the current amplification device and the common ground;

[0020] The fifth filter circuit is connected between the negative power supply of the current amplification device and the common ground.

[0021] In some embodiments, the sampling circuit includes a resistor R11 connected in series between the power supply device and the adjustable power supply, with a first end of the resistor R11 connected to the first filter circuit and a second end of the resistor R11 connected to the second filter circuit.

[0022] In some embodiments, the first filter circuit includes a resistor R12 and a capacitor C11; the second filter circuit includes a resistor R13 and a capacitor C12; and the third filter circuit includes a capacitor C13.

[0023] The first end of resistor R12 is connected to the first end of resistor R11, the second end of resistor R12 is connected to the first end of capacitor C11 and the inverting input terminal of the operational amplifier, and the second end of capacitor C11 is connected to common ground.

[0024] The first end of resistor R13 is connected to the second end of resistor R11, the second end of resistor R13 is connected to the first end of capacitor C12 and the non-inverting input of the operational amplifier, and the second end of capacitor C12 is connected to the common ground.

[0025] The capacitor C13 is connected between the inverting input terminal and the non-inverting input terminal of the operational amplifier;

[0026] Secondly, embodiments of this application provide a power board, including a power supply device and a current amplification device as described in the first aspect connected to the power supply device.

[0027] Thirdly, embodiments of this application provide a test machine including at least one power supply board as described in the second aspect.

[0028] The aforementioned power supply device's current amplification device, power board, and testing machine have the following technical advantages: the power supply device is connected to an adjustable power supply, and the current amplification device is connected to the current amplification power supply, the adjustable power supply of the power supply device, and the output terminal of the power supply device. The voltage of the current amplification power supply is subtracted from the voltage sampled by the adjustable power supply, and the current used to characterize the subtracted voltage is amplified according to the current amplification ratio and then output to the output terminal of the power supply device. The power supply device and current amplification device in this application use non-common rail power supplies, which can reduce the power supply load and thus avoid power supply damage. Attached Figure Description

[0029] Figure 1 A schematic diagram of the current amplification device of a power supply device in one embodiment provided in this application;

[0030] Figure 2 A schematic diagram of the current amplification device of a power supply device in an example embodiment provided in this application;

[0031] Figure 3 A circuit diagram of a current amplification device for a power supply device in an example embodiment provided in this application.

[0032] Among them, 100 is a power supply device; 200 is an adjustable power supply; 300 is a current amplification device; 400 is a current amplification power supply; 310 is a positive current amplification device; 311 is a positive operational amplifier circuit; 312 is a positive clamping circuit; 313 is a positive current amplification circuit; 320 is a negative current amplification device; 321 is a negative operational amplifier circuit; 322 is a negative clamping circuit; and 323 is a negative current amplification circuit. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application. Furthermore, it is understood that although the efforts made in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, modifications to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0034] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0035] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application means two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The terms “first,” “second,” “third,” etc., used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0036] Figure 1 This is a schematic diagram of the current amplification device of a power supply device in one embodiment provided in this application. Figure 1 As shown, power supply device 100 is connected to adjustable power supply 200. The voltage of adjustable power supply 200 is used to characterize the output current level of power supply device 100. Current amplification device 300 is connected to current amplification power supply 400, adjustable power supply 200 and the output terminal of power supply device 100. It is used to subtract the voltage sampled by the adjustable power supply from the voltage of current amplification power supply 400, and amplify the current used to characterize the subtracted voltage according to the current amplification ratio, and output it to the output terminal of power supply device 100.

[0037] In this embodiment, the power supply device can be a DPS (Programmable Device Power Supply) chip, which is an integrated power supply chip, or it can be an analog circuit composed of discrete devices.

[0038] In this embodiment, as the output current of the power supply device changes, the voltage sampled by the adjustable power supply also changes. The voltage sampled by the current amplification device from the adjustable power supply is subtracted from the voltage of the current amplification power supply, and the voltage after the subtraction also changes accordingly. Ultimately, the current amplification ratio of the current amplification device also changes, thereby realizing the current amplification function.

[0039] Since the power supply devices and current amplification devices use different power supplies, that is, non-common rail power supplies, the load on the power supply can be reduced, thereby avoiding power supply damage.

[0040] Figure 2 This is a schematic diagram of the current amplification device of a power supply device in an example embodiment provided in this application. For example... Figure 2 As shown, the positive current amplification power supply VCCP and the negative current amplification power supply VSSN used in the current amplification device 300 are different from the positive adjustable power supply HCAVCC and the negative adjustable power supply HCAVSS used in the power supply device 100; they are non-common rail power supplies. The power supply device 100 uses ±11V power supplies AVDD and AVSS to power the 2mA and 20mA current ranges of the power supply device, and the operational amplifier circuit of the current amplification device 300 also uses this power supply.

[0041] For example, the 0.2A, 1A, and 20A ranges of the power supply device are provided by a single LT8609SIV#PBF power supply as the positive adjustable power supply HCAVCC to achieve a 4V~8V power supply; the 0.2A, 1A, and 20A ranges of the negative adjustable power supply HCAVSS of the power supply device are provided by 16 channels using 3 MPM3519GPN-00A1-T chips to form a -5V power supply. The positive current amplification power supply VCCP of the current amplification device is provided by 3 MPM3519GPN-00A1-T chips to achieve a 3V~8V power supply, and the negative current amplification power supply VSSN is provided by 3 MPM3519GPN-00A1-T chips to achieve a -1V~-4V power supply.

[0042] Taking a DPS chip as an example, the power supply device requires a high-voltage adjustable power supply. The minimum positive adjustable voltage is 4V, and the minimum negative adjustable voltage is -5V. However, the maximum voltage of the chip under test when the input current is 20A is 1.5V. If the current amplification device and the DPS chip share the same power rail, the current amplification device needs to handle more power drop, resulting in higher power consumption and excessively high temperature.

[0043] If the current amplification device and the DPS chip use a different power supply, the current amplification device can be connected to a current amplification power supply with a lower voltage than the adjustable power supply. In this case, the current amplification device needs to handle less voltage drop power, thereby reducing the power consumption of the current amplification device and also reducing its temperature.

[0044] To meet the current amplification requirements of the positive and negative output currents of the power supply devices, such as Figure 3 As shown, the current amplification device 300 includes a positive current amplification device 310 and a negative current amplification device 320. The positive current amplification device 310 subtracts the voltage sampled by the adjustable power supply from the voltage of the positive current amplification power supply, and amplifies the current representing the subtracted voltage according to the current amplification ratio before outputting it to the output terminal HF of the power supply device. The negative current amplification device 320 subtracts the voltage sampled by the negative adjustable power supply from the voltage of the negative current amplification power supply, and amplifies the current representing the subtracted voltage according to the current amplification ratio before outputting it to the output terminal HF of the power supply device.

[0045] The positive and negative current amplification devices have the same structure. For example... Figure 3 As shown, the positive current amplification device 310 includes a positive operational amplifier circuit 311, a positive clamping circuit 312, and a positive current amplification circuit 313. The positive operational amplifier circuit 311 is connected to the positive adjustable power supply HCAVCC and the positive current amplification power supply VCCP, and is used to subtract the voltage sampled by the positive adjustable power supply from the voltage of the positive current amplification power supply. The positive clamping circuit 312 is used to clamp the current representing the subtracted voltage, so as to clamp the output current of the power supply device 100. The positive current amplification circuit 313 is connected to the positive clamping circuit 312, the positive current amplification power supply VCCP, and the output terminal HF of the power supply device 100, and is used to amplify the current representing the subtracted voltage according to the current amplification ratio and output it to the output terminal of the power supply device 100.

[0046] As the positive output current of the power supply device changes, the voltage sampled by the positive adjustable power supply will also change. The positive operational amplifier circuit subtracts the voltage sampled by the positive adjustable power supply from the voltage of the positive current amplification power supply. The voltage after subtraction also changes, and ultimately the amplification factor of the current amplification tube of the positive current amplification circuit will also change, that is, the current amplification ratio will also change, thereby realizing the current amplification function.

[0047] The clamping value of the positive clamping circuit is determined based on the component parameters of the positive clamping circuit and the applied setting voltage. When the output current of the power supply device amplifies to a certain level, the clamping function of the clamping circuit is triggered to prevent excessive output current from burning out the chip under test.

[0048] It should be noted that in some other embodiments, the positive clamping circuit may be omitted.

[0049] like Figure 3 As shown, the negative current amplification device 320 includes a negative operational amplifier circuit 321, a negative clamping circuit 322, and a negative current amplification circuit 323. The negative operational amplifier circuit 321 is connected to the negative adjustable power supply HCAVSS and the negative clamping circuit 322, and is used to subtract the voltage sampled by the negative adjustable power supply from the voltage of the negative current amplification power supply. The negative clamping circuit 322 is used to clamp the current representing the subtracted voltage, so as to clamp the output current of the power supply device 100. The negative current amplification circuit 323 is connected to the negative clamping circuit 322, the negative current amplification power supply VSSN, and the output terminal of the power supply device 100, and is used to amplify the current representing the subtracted voltage according to the current amplification ratio and output it to the output terminal of the power supply device 100.

[0050] It should be noted that in some other embodiments, the negative clamping circuit may be omitted.

[0051] The amplification principle of the negative amplification device is the same as that of the positive amplification device, and will not be repeated here.

[0052] like Figure 3 As shown, the positive operational amplifier circuit 311 includes a first sampling circuit and a first operational amplifier U1. The first sampling circuit is connected to the positive adjustable power supply HCAVCC and is used to sample the current of the positive adjustable power supply, which reflects the output current of the power supply device 100. The first operational amplifier U1 is connected to the first sampling circuit and the positive current amplification power supply VCCP and is used to subtract the sampled voltage from the voltage of the positive current amplification power supply. The amplification gain of the operational amplifier U1 can be 1.

[0053] The negative operational amplifier circuit 321 includes a second sampling circuit and a second operational amplifier U2. The second sampling circuit is connected to the negative adjustable power supply HCAVSS and is used to sample the current of the negative adjustable power supply. The second operational amplifier U2 is connected to the second sampling circuit and the negative current amplification power supply VSSN and is used to subtract the sampled voltage from the voltage of the negative current amplification power supply. The amplification gain of the operational amplifier U2 can be 1.

[0054] In some embodiments, the positive operational amplifier circuit 311 further includes a first filter circuit, a second filter circuit, and a third filter circuit. The first filter circuit is connected between a first terminal of the first sampling circuit and the inverting input terminal of the first operational amplifier U1; the second filter circuit is connected between a second terminal of the first sampling circuit and the non-inverting input terminal of the first operational amplifier U1; and the third filter circuit is connected between the inverting input terminal and the non-inverting input terminal of the first operational amplifier U1.

[0055] In some embodiments, the positive operational amplifier circuit 311 further includes a fourth filter circuit and a fifth filter circuit. The fourth filter circuit is connected between the positive power supply of the positive current amplification device and the common ground; the fifth filter circuit is connected between the negative power supply of the positive current amplification device and the common ground.

[0056] In some embodiments, the negative operational amplifier circuit 321 further includes a sixth filter circuit, a seventh filter circuit, and an eighth filter circuit. The sixth filter circuit is connected between the first terminal of the second sampling circuit and the inverting input terminal of the second operational amplifier U2; the seventh filter circuit is connected between the second terminal of the second sampling circuit and the non-inverting input terminal of the second operational amplifier U2; and the eighth filter circuit is connected between the inverting input terminal and the non-inverting input terminal of the second operational amplifier U2.

[0057] In some embodiments, the negative operational amplifier circuit 321 further includes a ninth filter circuit and a tenth filter circuit. The ninth filter circuit is connected between the positive power supply of the negative current amplification device and the common ground; the tenth filter circuit is connected between the negative power supply of the negative current amplification device and the common ground.

[0058] Specifically, the first sampling circuit includes a resistor R11, which is connected in series between the power supply device 100 and the positive adjustable power supply HCAVCC. The first end of the resistor R11 is connected to the first filter circuit, and the second end of the resistor R11 is connected to the second filter circuit.

[0059] The first filter circuit includes a resistor R12 and a capacitor C11; the second filter circuit includes a resistor R13 and a capacitor C12; the third filter circuit includes a capacitor C13; the first end of resistor R12 is connected to the first end of resistor R11, the second end of resistor R12 is connected to the first end of capacitor C11 and the inverting input terminal of the first operational amplifier U1, and the second end of capacitor C11 is connected to common ground; the first end of resistor R13 is connected to the second end of resistor R11, the second end of resistor R13 is connected to the first end of capacitor C12 and the non-inverting input terminal of the first operational amplifier U1, and the second end of capacitor C12 is connected to common ground; capacitor C13 is connected between the inverting input terminal and the non-inverting input terminal of the first operational amplifier U1.

[0060] The fourth filter circuit includes capacitor C14, which is connected between the positive power supply AVDD of the positive current amplification device and the common ground. The fifth filter circuit includes capacitor C15, which is connected between the negative power supply AVSS of the positive current amplification device and the common ground.

[0061] The second sampling circuit includes a resistor R21, which is connected in series between the power supply device 100 and the negative adjustable power supply HCAVSS. The first end of the resistor R21 is connected to the sixth filter circuit, and the second end of the resistor R21 is connected to the seventh filter circuit.

[0062] The sixth filter circuit includes resistor R22 and capacitor C21; the seventh filter circuit includes resistor R23 and capacitor C22; the eighth filter circuit includes capacitor C23; the first end of resistor R22 is connected to the first end of resistor R21, the second end of resistor R22 is connected to the first end of capacitor C21 and the inverting input terminal of the second operational amplifier U2, and the second end of capacitor C21 is connected to common ground; the first end of resistor R23 is connected to the second end of resistor R21, the second end of resistor R23 is connected to the first end of capacitor C22 and the non-inverting input terminal of the second operational amplifier U2, and the second end of capacitor C22 is connected to common ground; capacitor C23 is connected between the inverting input terminal and the non-inverting input terminal of the second operational amplifier U2.

[0063] The ninth filter circuit includes capacitor C24, which is connected between the positive power supply AVDD of the negative current amplification device and the common ground. The fifth filter circuit includes capacitor C25, which is connected between the negative power supply AVSS of the negative current amplification device and the common ground.

[0064] The following section uses a positive flow amplification device as an example to explain the flow amplification principle in detail.

[0065] The first sampling circuit reflects the output current of the power supply device at the current level by sampling the voltage across resistor R11. The first operational amplifier U1 subtracts the sampled voltage value from the current amplification power supply of the positive current amplification circuit, thus using the voltage of the current amplification power supply as the reference voltage. Operational amplification is performed to drive the positive current amplification circuit.

[0066] Resistor R11 is the sampling resistor, and the output voltage of the first operational amplifier U1 is... for:

[0067]

[0068] Where G represents the gain of the first operational amplifier U1, which is 1; This represents the voltage at the non-inverting input terminal of the first operational amplifier U1; This represents the voltage at the inverting input terminal of the first operational amplifier U1.

[0069] The positive clamping circuit and positive current amplification circuit employ conventional circuit designs within this technical field. The positive current amplification circuit typically includes a driving operational amplifier, a current amplification sampling resistor, and a current amplification diode. The input terminal of the driving operational amplifier is connected to the positive clamping circuit, and the output terminal is connected to the current amplification diode. The first terminal of the current amplification sampling resistor is connected to the positive current amplification power supply, and the second terminal is connected to the current amplification diode. The current amplification diode is also connected to the output terminal HF of the power supply device. The current amplification diode is, for example, an NPN transistor.

[0070] The first operational amplifier U1 inputs the subtracted voltage into the positive clamping circuit and compares it with the positive clamping current value. The compared signal is output to the driver operational amplifier of the positive current amplification circuit. The difference between this signal and the voltage across the current amplification sampling resistor causes the driver operational amplifier output to change with the output current of the power supply device. This changes the operating amplification region of the current amplification tube, ultimately causing the output current of the current amplification tube to change with the output current of the power supply device. Because the power supply device and the current amplification device use different power supplies, the load on the power supply can be reduced, thus avoiding power supply damage.

[0071] Resistor R12 and capacitor C11, and resistor R13 and capacitor C12, both form low-pass filters to filter out high-frequency interference signals. Capacitor C13 affects the differential signal, while capacitors C11 and C12 affect the common-mode signal. The mismatch between R13×C12 at the non-inverting input and R12×C11 at the inverting input will affect the common-mode rejection ratio of the first operational amplifier U1. By using a capacitor C1 that is an order of magnitude larger than capacitors C11 and C12, the effect of the mismatch can be reduced, and the performance of the common-mode rejection ratio near the cutoff frequency can be improved.

[0072] Capacitors C14 and C15 are used for filtering the positive and negative power supplies, respectively.

[0073] In some embodiments, this application provides a power board, including a power supply device and a current amplification device as described above connected to the power supply device.

[0074] It should be noted that the working principle and beneficial effects of the current amplification device for power supply devices have been described in detail in the above embodiments, so they will not be repeated in this embodiment.

[0075] In some embodiments, this application provides a test machine including at least one power supply board as described above.

[0076] It should be noted that the working principle and beneficial effects of the current amplification device for power supply devices have been described in detail in the above embodiments, so they will not be repeated in this embodiment.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A current amplification device for a power supply device, characterized in that, The power supply device is connected to an adjustable power supply, and the voltage of the adjustable power supply is used to characterize the output current level of the power supply device. The current amplification device is connected to the current amplification power supply, the adjustable power supply, and the output terminal of the power supply device. It is used to subtract the voltage sampled by the adjustable power supply from the voltage of the current amplification power supply, and amplify the current used to characterize the subtracted voltage according to the current amplification ratio before outputting it to the output terminal of the power supply device.

2. The current amplification device for the power supply device according to claim 1, characterized in that, The flow amplification device includes: An operational amplifier circuit is connected to the adjustable power supply and the current-amplifying power supply, and is used to subtract the voltage sampled by the adjustable power supply from the voltage of the current-amplifying power supply. The current amplification circuit is connected to the operational amplifier circuit, the current amplification power supply, and the output terminal of the power supply device. It is used to amplify the current used to characterize the voltage after subtraction according to the current amplification ratio and output it to the output terminal of the power supply device.

3. The current amplification device for the power supply device according to claim 2, characterized in that, The flow amplification device further includes: A clamping circuit, connected between the operational amplifier circuit and the current amplification circuit, is used to clamp the current representing the voltage after subtraction, so as to clamp the output current of the power supply device.

4. The current amplification device for the power supply device according to claim 2, characterized in that, The operational amplifier circuit includes: A sampling circuit, connected to the adjustable power supply, is used to sample the current of the adjustable power supply; An operational amplifier, connected to the sampling circuit and the current amplification power supply, is used to subtract the sampling voltage from the voltage of the current amplification power supply.

5. The current amplification device for the power supply device according to claim 4, characterized in that, The operational amplifier circuit also includes: A first filter circuit is connected between the first terminal of the sampling circuit and the inverting input terminal of the operational amplifier; The second filter circuit is connected between the second terminal of the sampling circuit and the non-inverting input terminal of the operational amplifier; The third filter circuit is connected between the inverting input and the non-inverting input of the operational amplifier.

6. The current amplification device for the power supply device according to claim 5, characterized in that, The operational amplifier circuit also includes: The fourth filter circuit is connected between the positive power supply of the current amplification device and the common ground; The fifth filter circuit is connected between the negative power supply of the current amplification device and the common ground.

7. The current amplification device for a power supply device according to claim 5, characterized in that, The sampling circuit includes a resistor R11, which is connected in series between the power supply device and the adjustable power supply. The first end of the resistor R11 is connected to the first filter circuit, and the second end of the resistor R11 is connected to the second filter circuit.

8. The current amplification device for the power supply device according to claim 7, characterized in that, The first filter circuit includes a resistor R12 and a capacitor C11; the second filter circuit includes a resistor R13 and a capacitor C12; the third filter circuit includes a capacitor C13. The first end of resistor R12 is connected to the first end of resistor R11, the second end of resistor R12 is connected to the first end of capacitor C11 and the inverting input terminal of the operational amplifier, and the second end of capacitor C11 is connected to common ground. The first end of resistor R13 is connected to the second end of resistor R11, the second end of resistor R13 is connected to the first end of capacitor C12 and the non-inverting input of the operational amplifier, and the second end of capacitor C12 is connected to common ground. The capacitor C13 is connected between the inverting input and the non-inverting input of the operational amplifier.

9. A power supply board, characterized in that, It includes a power supply device and a current amplification device as described in any one of claims 1-8 connected to the power supply device.

10. A testing machine, characterized in that, It includes at least one power supply board as described in claim 9.

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