Power supply device and test machine

Abstract

The utility model relates to a power supply device and a testing machine, and the power supply device comprises a loop controller which receives an error value and outputs a driving signal; the digital-to-analog converter is connected with the loop controller, receives the driving signal and outputs a test signal; the output and sampling unit is connected with the digital-to-analog converter and the tested device, transmits the test signal to the tested device, samples a feedback signal output by the tested device and outputs a sampling signal; the analog-to-digital converter is connected with the output and sampling unit, receives the sampling signal and outputs a sampling value; and the clamping control unit is connected with the analog-to-digital converter and the loop controller, and outputs a pre-clamping instruction to the loop controller when determining that a pre-clamping condition is met according to the sampling value output by the analog-to-digital converter and a preset pre-clamping set value, so that the loop controller slows down output. The trigger of the clamping function can be predicted in advance to act in advance, the high overshoot voltage / overshoot current for triggering the clamping can be avoided, and the tested device can be prevented from being damaged when an abnormality occurs.

Description

Technical Field

[0001] The present application relates to the field of semiconductor testing technology, and in particular to a power supply device and a testing machine. Background Art

[0002] Semiconductor automated testing refers to the use of automatic test equipment (ATE) to test various parameters of the device under test (DUT) to eliminate defective products and control the factory quality of semiconductor devices. The power supply device is used in semiconductor test equipment to provide voltage or current excitation to the device under test to achieve functions such as voltage and current measurement. How to make the power supply device have a protection function to ensure that the device under test is not damaged when an abnormality occurs is a problem that the baseband can solve. Utility Model Content

[0003] Based on this, it is necessary to provide a power supply device and a test machine with protection functions to address the above problems.

[0004] A first aspect of the present application provides a power supply device, comprising:

[0005] A loop controller receives the error value and outputs a driving signal;

[0006] A digital-to-analog converter, connected to the loop controller, receives the drive signal, and outputs a test signal;

[0007] an output and sampling unit, connected to the digital-to-analog converter and the device under test, transmitting the test signal to the device under test, sampling the feedback signal output by the device under test and outputting a sampled signal;

[0008] an analog-to-digital converter, connected to the output and the sampling unit, receiving the sampling signal, and outputting a sampling value;

[0009] A clamp control unit is connected to the analog-to-digital converter and the loop controller, and when it is determined that the pre-clamping condition is met based on the sampling value output by the analog-to-digital converter and a preset pre-clamping setting value, a pre-clamping instruction is output to the loop controller to slow down the output of the loop controller.

[0010] In one embodiment, the power supply device further comprises:

[0011] The adder is connected to the analog-to-digital converter and the loop controller, receives the set value output by the host computer and the sampled value output by the analog-to-digital converter, and outputs the error value to the loop controller.

[0012] In one embodiment, the power supply device also includes a switch K1, and the analog-to-digital converter includes a current measuring analog-to-digital converter and a pressure measuring analog-to-digital converter; the pressure measuring analog-to-digital converter and the current measuring analog-to-digital converter are both connected to the output and sampling unit, the static contact of the switch K1 is connected to the adder, the first moving contact of the switch K1 is connected to the current measuring analog-to-digital converter, and the second moving contact of the switch K1 is connected to the pressure measuring analog-to-digital converter.

[0013] In one of the embodiments, when the power supply device operates in FV mode, the pre-clamp setting value includes a pre-clamp current setting value;

[0014] The clamp control unit is connected to the current measuring analog-to-digital converter, receives the current sampling value output by the current measuring analog-to-digital converter, and outputs a pre-clamp instruction to the loop controller when determining that the pre-clamp condition is met based on the current sampling value and the pre-clamp current setting value.

[0015] In one of the embodiments, when the power supply device operates in FI mode, the pre-clamp setting value includes a pre-clamp voltage setting value;

[0016] The clamp control unit is connected to the pressure measuring analog-to-digital converter, receives the voltage sampling value output by the pressure measuring analog-to-digital converter, and outputs a pre-clamp instruction to the loop controller when determining that the pre-clamping condition is met based on the voltage sampling value and the pre-clamping voltage setting value.

[0017] In one embodiment, the power supply device also includes a switch K2, the static contact of the switch K2 is connected to the adder, the first moving contact and the second moving contact of the switch K2 are both connected to the host computer, the first moving contact of the switch K2 receives the set value output by the host computer, and the second moving contact of the switch K2 receives the clamping threshold output by the host computer.

[0018] In one of the embodiments, the clamp control unit is also connected to the switch K2 and the switch K1, the clamp control unit receives the sampled value output by the analog-to-digital converter, and controls the switch K2 and the switch K1 to switch after the clamp protection is triggered, changes the working mode of the power supply device, and outputs instructions to the loop controller so that the loop controller selects an output set value from the clamp threshold.

[0019] In one of the embodiments, when the power supply device operates in the FV mode, the static contact of the switch K2 is connected to the first moving contact, the static contact of the switch K1 is connected to the second moving contact, and the clamping threshold includes a current clamping threshold;

[0020] The clamp control unit is connected to the current measuring analog-to-digital converter, receives the current sampling value output by the current measuring analog-to-digital converter, and after determining the trigger current clamp according to the current sampling value and the current clamp threshold, switches the static contact of the switch K2 to be connected to the second moving contact, and switches the static contact of the switch K1 to be connected to the first moving contact, so that the power supply device is switched to the FI mode.

[0021] In one of the embodiments, when the power supply device operates in the FI mode, the static contact of the switch K2 is conductively connected to the first movable contact, the static contact of the switch K1 is conductively connected to the first movable contact, and the clamping threshold includes a voltage clamping threshold;

[0022] The clamping control unit is connected to the pressure measuring analog-to-digital converter, receives the voltage sampling value output by the pressure measuring analog-to-digital converter, and after determining the trigger voltage clamp based on the voltage sampling value and the voltage clamping threshold, switches the static contact of the switch K2 to be connected to the second moving contact, and switches the static contact of the switch K1 to be connected to the second moving contact, so that the power supply device is switched to the FV mode.

[0023] A second aspect of the present application provides a testing machine, comprising a host computer and the above-mentioned power supply device.

[0024] In the above-mentioned power supply device and test machine, the loop controller outputs a driving signal to the digital-to-analog converter according to the received error value, and the digital-to-analog converter outputs a test signal to the output and sampling unit according to the driving signal. The output and sampling unit transmits the test signal to the device under test, samples the feedback signal output by the device under test and outputs the sampling signal, the analog-to-digital converter receives the sampling signal and outputs the sampling value, and the clamp control unit determines that the pre-clamping condition is met according to the sampling value and the preset pre-clamping setting value, and outputs the pre-clamping instruction to the loop controller to slow down the output of the loop controller. It can predict the triggering of the clamping function in advance and act in advance to avoid the high overshoot voltage / overshoot current of the triggering clamp, realize the protection function, and ensure that the device under test is not damaged when an abnormality occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural block diagram of a power supply device in one embodiment;

[0026] Figure 2 is a structural principle diagram of a power supply device in one embodiment;

[0027] Figure 3 is a structural principle diagram of a power supply device in another embodiment;

[0028] Figure 4 and Figure 5 These are schematic diagrams of clamp overshoot optimization before and after pre-clamp optimization. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0032] When used herein, the singular forms "a", "an", and "the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0033] In one embodiment, Figure 1As shown, a power supply device is provided, including: a loop controller 120, a digital-to-analog converter DAC, an output and sampling unit 130, an analog-to-digital converter ADC and a clamp control unit 140, the digital-to-analog converter DAC is connected to the loop controller 120, the output and sampling unit 130 is connected to the digital-to-analog converter DAC and the device under test, the analog-to-digital converter ADC is connected to the output and sampling unit 130, and the clamp control unit 140 is connected to the analog-to-digital converter ADC and the loop controller 120. The loop controller 120 receives the error value and outputs a driving signal; the digital-to-analog converter DAC receives the driving signal and outputs a test signal; the output and sampling unit 130 transmits the test signal to the device under test, samples the feedback signal output by the device under test and outputs the sampling signal; the analog-to-digital converter ADC receives the sampling signal and outputs the sampling value; the clamp control unit 140 outputs a pre-clamp instruction to the loop controller 120 when determining that the pre-clamp condition is met according to the sampling value output by the analog-to-digital converter ADC and the preset pre-clamp setting value, so that the loop controller 120 slows down the output. Furthermore, the power supply device may also include an adder, which is connected to the analog-to-digital converter ADC and the loop controller 120, receives the set value output by the host computer and the sampled value output by the analog-to-digital converter ADC, and outputs the error value to the loop controller 120. The host computer may be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, and portable wearable devices, and the portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc.

[0034] Among them, the power supply device can specifically be a VI power supply board, which has FV (pressurization), MV (pressure measurement), FI (current addition), MI (current measurement) functions and their combinations. The clamp control unit 140 is integrated with clamp pre-trigger protection logic, which can predict the triggering of the clamp function in advance and act in advance to avoid triggering the high overshoot voltage and overshoot current of the clamp. The working mode of the power supply device can be FV mode or FI mode. Depending on the working mode of the power supply device, the sampling value, pre-clamp setting value and corresponding pre-clamp conditions will be different. In addition, the clamp control unit 140 can also integrate clamp trigger protection logic. When the clamp protection is triggered, the clamp control unit 140 will immediately switch the working mode of the power supply device.

[0035] For example, the working mode of the power supply device can be divided into a normal mode and a clamping mode, the normal mode is the FV mode / FI mode, and the clamping mode is the FI mode / FV mode. The pre-clamping setting value is sent to the clamping control unit 140 by the host computer for storage. When the power supply device works in the normal mode, the adder receives the setting value output by the host computer and the sampling value output by the analog-to-digital converter ADC for comparison, and outputs the error value to the loop controller 120. The loop controller 120 outputs a driving signal according to the error value. After the digital-to-analog converter DAC performs digital-to-analog conversion, the test signal is obtained and sent to the device under test through the output and sampling unit 130. The clamp control unit 140 monitors the output voltage or current of the device under test in real time in combination with the current output mode. When it is determined that the pre-clamping condition is met according to the sample value output by the analog-to-digital converter ADC and the preset pre-clamp setting value, the pre-clamping function is triggered, and the clamp control unit 140 sends a pre-clamping instruction to the loop controller 120. Specifically, it can be to send a flag to the loop controller 120 so that the loop controller 120 adjusts the working parameters to slow down the output. The specific degree of slowing down can be set according to actual needs. After executing the pre-clamping function, the power supply device may not trigger the clamping protection, or it may trigger the clamping protection. After detecting that the clamping protection is triggered, the clamp control unit 140 switches the normal working mode of the power supply device to the clamping mode to achieve high-precision control of the clamp.

[0036] The above-mentioned power supply device, when the clamp control unit 140 determines that the pre-clamping condition is met according to the sampling value and the preset pre-clamping setting value, outputs a pre-clamping instruction to the loop controller 120, so that the loop controller 120 slows down the output, and can predict the triggering of the clamping function in advance and act in advance, avoiding the high overshoot voltage / overshoot current that triggers the clamp, thereby realizing a protection function and ensuring that the device under test is not damaged when an abnormality occurs.

[0037] In one embodiment, Figure 2As shown, the power supply device also includes a switch K1, and the analog-to-digital converter ADC includes a current measuring analog-to-digital converter ADC1 and a pressure measuring analog-to-digital converter ADC2; the pressure measuring analog-to-digital converter ADC2 and the current measuring analog-to-digital converter ADC1 are both connected to the output and sampling unit 130, the static contact of the switch K1 is connected to the adder 110, the first moving contact of the switch K1 is connected to the current measuring analog-to-digital converter ADC1, and the second moving contact of the switch K1 is connected to the pressure measuring analog-to-digital converter ADC2. Further, the power supply device also includes a switch K2, the static contact of the switch K2 is connected to the adder 110, the first moving contact and the second moving contact of the switch K2 are both connected to the host computer 210, the first moving contact of the switch K2 receives the set value output by the host computer 210, and the second moving contact of the switch K2 receives the clamping threshold output by the host computer 210. Among them, switch K1 and switch K2 can adopt manual switching switches, or they can adopt relays or other control switches. When switch K1 and switch K2 adopt control switches, the clamp control unit 140 can be connected to switch K1 and switch K2 to control switch K1 and switch K2 to change the working mode of the power supply device.

[0038] It should be noted that the power supply device may include a plurality of independent digital power supply channels, each of which includes an adder 110, a loop controller 120, a digital-to-analog converter DAC, an output and sampling unit 130, an analog-to-digital converter ADC, a switch K1 and a switch K2. Each digital power supply channel may be configured with a clamping control unit 140, or the same clamping control unit 140 may be used to perform clamping control on each digital power supply channel.

[0039] In one embodiment, when the power supply device operates in FV mode, the pre-clamp setting value includes a pre-clamp current setting value PreClamp1. The clamp control unit 140 is connected to the current measuring analog-to-digital converter ADC1, receives the current sampling value output by the current measuring analog-to-digital converter ADC1, and outputs a pre-clamp instruction to the loop controller 120 when it is determined that the pre-clamp condition is met according to the current sampling value and the pre-clamp current setting value PreClamp1.

[0040] Specifically, Figure 2As shown, when the power supply device operates in the normal mode: FV mode, the clamping threshold configured by the host computer 210 is the current clamping threshold (including the current clamping upper limit value IClampH and the current clamping lower limit value IClampL), the configured setting value is the voltage setting value Vset, and the configured pre-clamping setting value is the pre-clamping current setting value PreClamp1. The initial state of the switch K1 is that the static contact is connected to the second moving contact, that is, the adder 110 is connected to the pressure measuring analog-to-digital converter ADC2. The initial state of the switch K2 is that the static contact is connected to the first moving contact, that is, the adder 110 receives the voltage setting value Vset output by the host computer. The adder 110 compares the voltage sampling value output by the pressure measuring analog-to-digital converter ADC2 with the voltage setting value Vset, and outputs the voltage error value to the loop controller 120. The loop controller 120 outputs a driving signal to the digital-to-analog converter DAC according to the voltage error value for digital-to-analog conversion, and the obtained test signal is sent to the device under test through the output and sampling unit 130. Assuming that the pre-clamping function will be triggered during the output process, the current sampling value output by the current measuring analog-to-digital converter ADC1 is monitored in real time by the clamping control unit 140, and the current change rate K1 is determined in combination with the current sampling value monitored within the set time period. If the current current sampling value I+4*K1>PreClamp1, it is considered that the pre-clamping condition is met, and the clamping control unit 140 will trigger the pre-clamping function to slow down the output of the loop controller 120 to avoid current overshoot when the current clamp is triggered.

[0041] In one embodiment, when the power supply device operates in FI mode, the pre-clamp setting value includes a pre-clamp voltage setting value PreClamp2. The clamp control unit 140 is connected to the pressure measuring analog-to-digital converter ADC2, receives the voltage sampling value output by the pressure measuring analog-to-digital converter ADC2, and outputs a pre-clamp instruction to the loop controller 120 when it is determined that the pre-clamp condition is met according to the voltage sampling value and the pre-clamp voltage setting value PreClamp2.

[0042] Specifically, Figure 3As shown, when the power supply device operates in the normal mode: FI mode, the clamping threshold configured by the host computer 210 is the voltage clamping threshold (including the voltage clamping upper limit value VClampH and the voltage clamping lower limit value VClampL), the configured setting value is the current setting value Iset, and the configured pre-clamping setting value is the pre-clamping voltage setting value PreClamp2. The initial state of the switch K1 is that the static contact is connected to the first moving contact, that is, the adder 110 is connected to the current measuring analog-to-digital converter ADC1. The initial state of the switch K2 is that the static contact is connected to the first moving contact, that is, the adder 110 receives the current setting value Iset output by the host computer 210. The adder 110 compares the current sampling value output by the current measuring analog-to-digital converter ADC1 with the current setting value Iset, and outputs the current error value to the loop controller 120. The loop controller 120 outputs a driving signal to the digital-to-analog converter DAC according to the current error value for digital-to-analog conversion, and the obtained test signal is sent to the device under test via the output and sampling unit 130. Assuming that the pre-clamping function will be triggered during the output process, the voltage sampling value output by the pressure measuring analog-to-digital converter ADC2 is monitored in real time through the clamping control unit 140, and the voltage change rate K2 is determined in combination with the voltage sampling value monitored within the set time period. If the current voltage sampling value V+4*K2>PreClamp2, it is considered that the pre-clamping condition is met, and the clamping control unit 140 will trigger the pre-clamping function to slow down the output of the loop controller 120 to avoid current overshoot when the current clamp is triggered.

[0043] In one embodiment, the clamp control unit 140 is also connected to the switch K2 and the switch K1. The clamp control unit 140 receives the sampled value output by the analog-to-digital converter ADC, and controls the switch K2 and the switch K1 to switch after the clamp protection is triggered, thereby changing the working mode of the power supply device, and outputs instructions to the loop controller 120 so that the loop controller 120 selects an output setting value from the clamp threshold.

[0044] After the power supply device operates in normal mode to perform the pre-clamping function, the clamping control unit 140 continues to monitor the sampling value output by the analog-to-digital converter ADC. If a trigger clamp is detected, the switch K1 and the switch K2 are controlled to switch, thereby switching the working mode of the power supply device to the clamping mode, and outputting instructions to the loop controller 120, informing the loop controller 120 to select the threshold value for triggering the clamp current (the upper limit value or the lower limit value in the clamping threshold value) as the output setting value, thereby achieving a constant current / voltage output, thereby achieving a high-precision current clamping function.

[0045] In one embodiment, when the power supply device operates in the FV mode, the static contact of the switch K2 is connected to the first moving contact, the static contact of the switch K1 is connected to the second moving contact, and the clamping threshold includes the current clamping threshold. The clamping control unit 140 is connected to the current measuring analog-to-digital converter ADC1, receives the current sampling value output by the current measuring analog-to-digital converter ADC1, and after determining the trigger current clamping according to the current sampling value and the current clamping threshold, switches the static contact of the switch K2 to be connected to the second moving contact, and switches the static contact of the switch K1 to be connected to the first moving contact, so that the power supply device is switched to the FI mode.

[0046] Specifically, Figure 2 As shown, when the power supply device operates in the normal mode: FV mode, the current clamping threshold includes the current clamping upper limit value IClampH and the current clamping lower limit value IClampL, and the initial state of the switch K1 is that the static contact is connected to the second moving contact, that is, the adder 110 is connected to the pressure measuring analog-to-digital converter ADC2. The initial state of the switch K2 is that the static contact is connected to the first moving contact, that is, the adder 110 receives the voltage setting value Vset output by the host computer 210. After the pre-clamping function is triggered during the output process, the clamping control unit 140 continues to obtain the current sampling value output by the current measuring analog-to-digital converter ADC1, and compares the current sampling value with the current clamping upper limit value IClampH and the current clamping lower limit value IClampL. If the current sampling value is greater than the current clamping upper limit value IClampH, or the current sampling value is less than the current clamping lower limit value IClampL, the current clamping is triggered, and the clamping control unit 140 switches the static contact of the switch K2 to be connected with the second moving contact, that is, the adder 110 receives the current clamping threshold output by the host computer 210, and switches the static contact of the switch K1 to be connected with the first moving contact, that is, the adder 110 is connected with the current measuring analog-to-digital converter ADC1, so that the power supply device switches to the FI mode. In addition, the clamping control unit 140 also outputs instructions to the loop controller 120, so that the loop controller 120 selects an output setting value from the current clamping threshold. For example, if the current clamp is triggered because the current sampling value is greater than the current clamp upper limit value IClampH, the loop controller 120 selects the current clamp upper limit value IClampH as the output setting value; if the current clamp is triggered because the current sampling value is less than the current clamp lower limit value IClampL, the loop controller 120 selects the current clamp lower limit value IClampL as the output setting value to achieve constant current output, thereby achieving a high-precision current clamping function.

[0047] In one embodiment, when the power supply device operates in the FI mode, the static contact of the switch K2 is connected to the first moving contact, the static contact of the switch K1 is connected to the first moving contact, and the clamping threshold includes a voltage clamping threshold. The clamping control unit 140 is connected to the pressure measuring analog-to-digital converter ADC2, receives the voltage sampling value output by the pressure measuring analog-to-digital converter ADC2, and after determining the trigger voltage clamping according to the voltage sampling value and the voltage clamping threshold, switches the static contact of the switch K2 to be connected to the second moving contact, and switches the static contact of the switch K1 to be connected to the second moving contact, so that the power supply device is switched to the FV mode.

[0048] Specifically, Figure 3 As shown, when the power supply device operates in the normal mode: FV mode, the voltage clamping threshold includes the voltage clamping upper limit value VClampH and the voltage clamping lower limit value VClampL, and the initial state of the switch K1 is that the static contact is connected to the first moving contact, that is, the adder 110 is connected to the current measuring analog-to-digital converter ADC1. The initial state of the switch K2 is that the static contact is connected to the first moving contact, that is, the adder 110 receives the current setting value Iset output by the host computer 210. After the pre-clamping function is triggered during the output process, the clamping control unit 140 continues to obtain the voltage sampling value output by the pressure measuring analog-to-digital converter ADC2, and compares the voltage sampling value with the voltage clamping upper limit value VClampH and the voltage clamping lower limit value VClampL. If the voltage sampling value is greater than the voltage clamping upper limit value VClampH, or the voltage sampling value is less than the voltage clamping lower limit value VClampL, the voltage clamping is triggered, and the clamping control unit 140 switches the static contact of the switch K2 to be connected with the second moving contact, that is, the adder 110 receives the voltage clamping threshold value output by the host computer 210, and switches the static contact of the switch K1 to be connected with the second moving contact, that is, the adder 110 is connected with the pressure measuring analog-to-digital converter ADC2, so that the power supply device is switched to the FV mode. In addition, the clamping control unit 140 also outputs instructions to the loop controller 120, so that the loop controller 120 selects an output setting value from the current clamping threshold value. For example, if the voltage clamp is triggered because the voltage sampling value is greater than the voltage clamp upper limit value VClampH, the loop controller 120 selects the voltage clamp upper limit value VClampH as the output setting value; if the voltage clamp is triggered because the voltage sampling value is less than the voltage clamp lower limit value VClampL, the loop controller 120 selects the voltage clamp lower limit value VClampL as the output setting value to achieve a constant voltage output, thereby realizing a high-precision voltage clamping function.

[0049] In one embodiment, a testing machine is further provided, comprising a host computer and the above-mentioned power supply device.

[0050] like Figure 4 and Figure 5As shown, the above-mentioned power supply device and test machine can optimize the clamping overshoot through pre-clamping in the power supply device, predict the triggering of the clamping function in advance and act in advance, thereby avoiding the high overshoot voltage and overshoot current of the triggering clamp.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0052] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A power supply device, characterized in that: include: A loop controller receives the error value and outputs a driving signal; A digital-to-analog converter, connected to the loop controller, receives the drive signal, and outputs a test signal; an output and sampling unit, connected to the digital-to-analog converter and the device under test, transmitting the test signal to the device under test, sampling the feedback signal output by the device under test and outputting a sampled signal; an analog-to-digital converter, connected to the output and the sampling unit, receiving the sampling signal, and outputting a sampling value; A clamp control unit is connected to the analog-to-digital converter and the loop controller, and when it is determined that the pre-clamping condition is met based on the sampling value output by the analog-to-digital converter and a preset pre-clamping setting value, a pre-clamping instruction is output to the loop controller to slow down the output of the loop controller.

2. The power supply device according to claim 1, characterized in that: Also includes: The adder is connected to the analog-to-digital converter and the loop controller, receives the set value output by the host computer and the sampled value output by the analog-to-digital converter, and outputs the error value to the loop controller.

3. The power supply device according to claim 2, characterized in that: It also includes a switch K1, and the analog-to-digital converter includes a current measuring analog-to-digital converter and a pressure measuring analog-to-digital converter; the pressure measuring analog-to-digital converter and the current measuring analog-to-digital converter are both connected to the output and sampling unit, the static contact of the switch K1 is connected to the adder, the first moving contact of the switch K1 is connected to the current measuring analog-to-digital converter, and the second moving contact of the switch K1 is connected to the pressure measuring analog-to-digital converter.

4. The power supply device according to claim 3, characterized in that: When the power supply device operates in FV mode, the pre-clamp setting value includes a pre-clamp current setting value; The clamp control unit is connected to the current measuring analog-to-digital converter, receives the current sampling value output by the current measuring analog-to-digital converter, and outputs a pre-clamp instruction to the loop controller when determining that the pre-clamp condition is met based on the current sampling value and the pre-clamp current setting value.

5. The power supply device according to claim 3, characterized in that: When the power supply device operates in FI mode, the pre-clamp setting value includes a pre-clamp voltage setting value; The clamp control unit is connected to the pressure measuring analog-to-digital converter, receives the voltage sampling value output by the pressure measuring analog-to-digital converter, and outputs a pre-clamp instruction to the loop controller when determining that the pre-clamping condition is met based on the voltage sampling value and the pre-clamping voltage setting value.

6. The power supply device according to claim 3, characterized in that: It also includes a switch K2, the static contact of the switch K2 is connected to the adder, the first moving contact and the second moving contact of the switch K2 are both connected to the host computer, the first moving contact of the switch K2 receives the set value output by the host computer, and the second moving contact of the switch K2 receives the clamping threshold output by the host computer.

7. The power supply device according to claim 6, characterized in that: The clamp control unit is also connected to the switch K2 and the switch K1. The clamp control unit receives the sampled value output by the analog-to-digital converter, and controls the switch K2 and the switch K1 to switch after the clamp protection is triggered, changes the working mode of the power supply device, and outputs instructions to the loop controller so that the loop controller selects an output set value from the clamp threshold.

8. The power supply device according to claim 7, characterized in that: When the power supply device operates in the FV mode, the static contact of the switch K2 is connected to the first moving contact, the static contact of the switch K1 is connected to the second moving contact, and the clamping threshold includes a current clamping threshold; The clamp control unit is connected to the current measuring analog-to-digital converter, receives the current sampling value output by the current measuring analog-to-digital converter, and after determining the trigger current clamp according to the current sampling value and the current clamp threshold, switches the static contact of the switch K2 to be connected to the second moving contact, and switches the static contact of the switch K1 to be connected to the first moving contact, so that the power supply device is switched to the FI mode.

9. The power supply device according to claim 7, characterized in that: When the power supply device operates in the FI mode, the static contact of the switch K2 is connected to the first moving contact, the static contact of the switch K1 is connected to the first moving contact, and the clamping threshold includes a voltage clamping threshold; The clamping control unit is connected to the pressure measuring analog-to-digital converter, receives the voltage sampling value output by the pressure measuring analog-to-digital converter, and after determining the trigger voltage clamp based on the voltage sampling value and the voltage clamping threshold, switches the static contact of the switch K2 to be connected to the second moving contact, and switches the static contact of the switch K1 to be connected to the second moving contact, so that the power supply device is switched to the FV mode.

10. A testing machine, characterized in that: It comprises a host computer and the power supply device according to any one of claims 1 to 9.

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