Power supply detection circuit and detection method

Abstract

This application discloses a power supply detection circuit and detection method. The power supply detection circuit includes: a power supply; a load having a first load terminal and a second load terminal, the second load terminal being connected to the negative terminal of the power supply; at least one detection port group connected between the positive terminal of the power supply and the first load terminal, the detection port group including a first port and a second port; a variable inductor component, wherein, in the detection state, the variable inductor component is detachably connected between the first port and the second port of one of the detection port groups; the first port and the second port of other detection port groups are short-circuited; wherein, different detection port groups correspond to different detection targets, and the inductance value of the variable inductor component connected to the detection port group is different, resulting in different power supply performance parameters obtained by detection, and different power supply performance parameters characterize different detection targets.

Description

Technical Field

[0001] This application relates to the field of circuit testing, and more specifically, to a power supply testing circuit and testing method. Background Technology

[0002] In power supply design, the common industry practice for determining parasitic inductance constraints is through simulation and testing. First, power supply designers provide parasitic inductance constraints through simulation, or the power chip manufacturer provides them. The PCB (printed circuit board) design then meets these constraints, and testing is performed after the board is completed. However, simulation results are dependent on model accuracy and simulation methods. Furthermore, to mitigate downstream application design risks, the parasitic inductance constraints provided by designers or chip manufacturers often include a margin, making it difficult to accurately determine the parasitic inductance constraints in the power supply design. This results in excessively high constraints on the PCB design, increasing the complexity of board-level design. Moreover, the current demands of chips on the board, such as CPUs, GPUs, and NPUs, are increasing, placing higher demands on the transient response of the power supply system. Single-ended near-end feedback is no longer sufficient, leading to the use of far-end feedback. However, far-end feedback suffers from long feedback lines, making it susceptible to interference and difficult to accurately pinpoint the optimal far-end feedback point. Summary of the Invention

[0003] In view of this, this application provides a power supply detection circuit and detection method, the scheme of which is as follows:

[0004] The power detection circuit includes:

[0005] power supply;

[0006] The load has a first load terminal and a second load terminal, the second load terminal being connected to the negative terminal of the power supply;

[0007] At least one detection port group is connected between the positive terminal of the power supply and the first load terminal, the detection port group including a first port and a second port;

[0008] In the detection state, the variable inductor component is detachably connected between the first and second ports of one of the detection port groups; the first and second ports of the other detection port groups are short-circuited.

[0009] Different detection port groups correspond to different detection targets, and the inductance values ​​of the variable inductor components connected to the detection port groups are different, resulting in different power supply performance parameters. Different power supply performance parameters characterize different detection targets.

[0010] Preferably, in the above-described power detection circuit, the power detection circuit further includes:

[0011] A first capacitor connected between the positive and negative terminals of the power supply;

[0012] The converter circuit has an input terminal, an output terminal, a first detection terminal, and a second detection terminal;

[0013] The first detection terminal of the conversion sub-circuit is connected to the first load terminal, and the second detection terminal of the conversion sub-circuit is connected to the second load terminal; the input terminal of the conversion sub-circuit is coupled to the positive terminal of the power supply.

[0014] Preferably, in the power detection circuit described above, the conversion sub-circuit includes one of the following: a low-dropout linear regulator circuit, a buck converter circuit, and a boost converter circuit.

[0015] Preferably, in the power detection circuit described above, the at least one detection port group includes a first detection port group, the first port of the first detection port group is connected to a first node, and the second port of the first detection port group is connected to the input terminal of the conversion sub-circuit; the first node is the common node of the positive electrode and the first capacitor;

[0016] When a first variable inductor component is connected between the first port and the second port of the first detection port group, it is used to detect the first power performance parameter of the power detection circuit.

[0017] Preferably, in the above power detection circuit, the at least one detection port group includes a second detection port group, the first port of the second detection port group is connected to the output terminal of the conversion sub-circuit, and the second port of the second detection port group is connected to a second node; the second node is a common node between the output terminal of the conversion sub-circuit and the first load terminal;

[0018] When a second variable inductor component is connected between the first and second ports of the second detection port group, it is used to detect the second power performance parameter of the power detection circuit.

[0019] Preferably, in the above power detection circuit, the load includes an output capacitor, a load capacitor, and a load resistor connected in parallel;

[0020] The at least one detection port group includes a third detection port group, the first port of the third detection port group is connected to the second node, the second port of the third detection port group is connected to the third node, and the third node is a common node of the first load terminal of the output capacitor and the first load terminal of the load capacitor;

[0021] When a third variable inductor component is connected between the first port and the second port of the third detection port group, it is used to detect the third power performance parameter of the power detection circuit.

[0022] Alternatively, the at least one detection port group includes a fourth detection port group, the first port of the fourth detection port group is connected to the third node, the second port of the fourth detection port group is connected to the fourth node, and the fourth node is a common node of the first load terminal of the load capacitor and the first load terminal of the load resistor;

[0023] When a fourth variable inductor component is connected between the first and second ports of the fourth detection port group, it is used to detect the fourth power performance parameter of the power detection circuit.

[0024] Preferably, in the above power detection circuit, the inductor component includes at least one standard parasitic inductor unit;

[0025] When the inductor assembly has multiple standard parasitic inductance units, the multiple standard parasitic inductance units are connected in series and / or in parallel so that the inductor assembly has a target inductance value.

[0026] This application also proposes a detection method for a power supply detection circuit, wherein the power supply detection circuit has at least one detection port group, the detection port group including a first port and a second port, different detection port groups corresponding to different detection targets, and the detection method includes:

[0027] Based on the detection target, select the corresponding detection port group as the target detection port group;

[0028] A variable inductor is connected between the first and second ports of the target detection port group. After shorting the first and second ports of the other detection port groups, the power supply performance parameters are detected.

[0029] By adjusting the connected variable inductor component, different inductance values ​​are obtained, and the power performance parameters corresponding to the detection target under different inductance values ​​are obtained.

[0030] Preferably, in the above detection method, when the power performance parameters corresponding to the current detection target are optimal, the optimal inductance value of the variable inductor component is obtained, and the optimal inductance value is used as the parasitic inductance design value of the line corresponding to the location of the current detection port group in the power application circuit.

[0031] Preferably, in the above detection method, the inductor assembly includes at least one standard parasitic inductance unit;

[0032] When the inductor assembly has multiple standard parasitic inductor units, the multiple standard parasitic inductor units are connected in series and / or in parallel to form the inductor assembly;

[0033] The inductance value of the inductor assembly can be adjusted by changing the number and / or connection relationship of the standard parasitic inductor units within the inductor assembly.

[0034] Based on the above, this application proposes a power supply detection circuit and detection method. The power supply detection circuit includes: a power supply; a load having a first load terminal and a second load terminal, the second load terminal being connected to the negative terminal of the power supply; at least one detection port group connected between the positive terminal of the power supply and the first load terminal, the detection port group including a first port and a second port; a variable inductor component, wherein, in the detection state, the variable inductor component is detachably connected between the first port and the second port of one of the detection port groups; the first port and the second port of other detection port groups are short-circuited; wherein, different detection port groups correspond to different detection targets, and the inductance value of the variable inductor component connected to the detection port group is different, resulting in different power supply performance parameters obtained by detection, and different power supply performance parameters characterize different detection targets. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0037] Figure 1 A circuit diagram of a power detection circuit without a variable inductor component provided in an embodiment of this application;

[0038] Figure 2 A circuit diagram of a power detection circuit provided in another embodiment of this application;

[0039] Figure 3 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0040] Figure 4 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0041] Figure 5 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0042] Figure 6 This is a circuit diagram of a variable inductor component in yet another embodiment of this application;

[0043] Figure 7 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0044] Figure 8 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0045] Figure 9 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0046] Figure 10 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0047] Figure 11 A circuit diagram of a power supply detection circuit provided in another embodiment of this application;

[0048] Figure 12 This is a flowchart of a power detection method provided in another embodiment of this application. Detailed Implementation

[0049] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0050] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] An embodiment of this application provides a power supply detection circuit, the power supply detection circuit comprising:

[0052] Power supply VCC;

[0053] The load has a first load terminal and a second load terminal, with the second load terminal connected to the negative terminal of the power supply VCC.

[0054] At least one detection port group is connected between the positive terminal of the power supply VCC and the first load terminal, the detection port group including a first port and a second port;

[0055] In the detection state, the variable inductance component is detachably connected between the first and second ports of a detection port group; the first and second ports of other detection port groups are shorted.

[0056] Different detection port groups correspond to different detection targets, and the inductance values ​​of the variable inductor components connected to the detection port groups are different, resulting in different power supply performance parameters. Different power supply performance parameters characterize different detection targets.

[0057] refer to Figure 1 , Figure 1 This application provides a circuit diagram of a power supply detection circuit without a connected variable inductor component. In this power supply detection circuit, four detection port groups are set between the power supply VCC and the first load terminal of the load. The first and second ports of each detection port group are used to directly connect to the variable inductor component. Among the four detection port groups, the corresponding detection port group is selected as the target detection port group based on the detection target, and the target detection port is connected to its corresponding variable inductor component. The first and second ports of the remaining detection port groups are short-circuited. The inductance value of the variable inductor component can be changed based on the designed inductance value of the detection port group. During the detection process, different inductance values ​​of the variable inductor component connected to the target detection port group result in different power supply performance parameters. Based on the optimal performance parameters, the optimal inductance value corresponding to the location of the target detection port group is obtained. During the testing process, the four detection port groups located in the power supply detection circuit correspond to different power supply performance parameters. Thus, different detection targets can be characterized based on different power supply performance parameters. The power supply performance parameters corresponding to the detection port groups include various indicators such as power input linear regulation, feedback loop stability, determination of the location of the far-end feedback point in the circuit, input voltage regulation, load regulation, and ripple.

[0058] refer to Figure 2 , Figure 2 A circuit diagram of a power detection circuit provided in another embodiment of this application is provided. In the power detection circuit of another embodiment of this application, the power detection circuit further includes:

[0059] The first capacitor C1 is connected between the positive and negative terminals of the power supply VCC;

[0060] The converter circuit 5 has an input terminal, an output terminal, a first detection terminal, and a second detection terminal;

[0061] The first detection terminal of the converter circuit 5 is connected to the first load terminal, and the second detection terminal of the converter circuit 5 is connected to the second load terminal; the input terminal of the converter circuit 5 is coupled to the positive terminal of the power supply VCC.

[0062] refer to Figure 2The power detection circuit shown in the figure also includes: a first capacitor C1 and a conversion sub-circuit 5; the first capacitor C1 is directly connected between the positive and negative terminals of the power supply VCC for filtering and eliminating interference, and the first capacitor C1 is the input capacitor in the entire circuit; the first detection terminal of the conversion sub-circuit 5 is connected to the first load terminal, and the second detection terminal of the conversion sub-circuit 5 is connected to the second load terminal; the input terminal of the conversion sub-circuit 5 is coupled to the positive terminal of the power supply VCC, wherein the conversion sub-circuit 5 is used to convert the power supply voltage in the entire circuit, thereby adjusting the voltage value output from the circuit to the load.

[0063] In another embodiment of this application, a power detection circuit is provided, at least one detection port group includes a first detection port group A1, the first port of the first detection port group A1 is connected to a first node 1, and the second port of the first detection port group A1 is connected to the input terminal of the conversion sub-circuit 5; the first node 1 is the common node of the positive terminal and the first capacitor C1;

[0064] refer to Figure 2 A first variable inductor component L1 is connected between the first port and the second port of the first detection port group A1 for detecting the first power performance parameter of the power detection circuit.

[0065] exist Figure 2 The power supply detection circuit shown includes four detection port groups, one of which is the first detection port group A1. This embodiment uses the first detection port group A1 as the target detection port group for illustration. During the detection process, the inductance value of the first variable inductor component L1 is changed, and the actual inductance value of the first variable inductor component L1 is determined based on the magnitude of the input linear regulation of the power supply VCC. When the parasitic inductance value of the power supply detection circuit is too high, it will cause a deterioration in the power supply input linear regulation, meaning that changes in the input voltage will affect the output voltage, such as increased ripple and voltage drops. During the detection process, the maximum inductance value of the first variable inductor component L1 in the power conversion circuit is obtained based on a fixed power supply performance test. The maximum inductance value of the first variable inductor component L1 is an actual constraint of the printed circuit board design, and the maximum inductance value of the first variable inductor component L1 is greater than the simulated maximum value. The difference between the maximum inductance value and the simulated value of the first variable inductor component L1 can be calculated based on the maximum value of the first variable inductor component L1, thereby obtaining more accurate design constraints, releasing chip design margin to the PCB board level, and reducing PCB design difficulty.

[0066] refer to Figure 3 , Figure 3The circuit diagram of a power detection circuit provided in another embodiment of this application is shown. In the power detection circuit provided in another embodiment of this application, at least one detection port group includes a second detection port group A2. The first port of the second detection port group A2 is connected to the output terminal of the conversion sub-circuit 5, and the second port of the second detection port group A2 is connected to the second node 2. The second node 2 is the common node between the output terminal of the conversion sub-circuit 5 and the first load terminal.

[0067] When the second variable inductor component L2 is connected between the first and second ports of the second detection port group A2, it is used to detect the second power performance parameters of the power detection circuit.

[0068] exist Figure 3 The power detection circuit shown includes four detection port groups, one of which is the second detection port group A2. This embodiment uses the second detection port group A2 as the target detection port group for explanation. During the detection process, the inductance value of the second variable inductor component L2 is changed. Based on the influence of the inductance value of the second variable inductor component L2 on the feedback loop, the optimal inductance value of the second variable inductor component L2 is determined. The inductance value of the second variable inductor component L2 is inversely proportional to the response speed of the feedback point. The optimal inductance value of the second variable inductor component L2 is the maximum value of the second variable inductor component L2 while satisfying the phase margin and gain margin of the feedback loop. The smaller the inductance value of the second variable inductor component L2, the faster the response speed of the feedback point in the feedback loop, resulting in faster changes in the power supply voltage in the feedback loop, causing loop power supply voltage oscillations. This affects the stability of the feedback loop in the power detection circuit. Loop stability issues refer to the occurrence of power supply voltage oscillations during power supply use, which can easily damage the power supply.

[0069] refer to Figure 4 and Figure 5 , Figure 4 A circuit diagram of a power supply detection circuit is provided in another embodiment of this application. Figure 5 The circuit diagram of a power detection circuit provided in another embodiment of this application is shown. In the power detection circuit provided in another embodiment of this application, the load includes an output capacitor C2, a load capacitor C3 and a load resistor R connected in parallel.

[0070] At least one detection port group includes a third detection port group A3. The first port of the third detection port group A3 is connected to the second node 2, and the second port is connected to the third node 3. The third node 3 is the common node of the first load terminal of the output capacitor C2 and the first load terminal of the load capacitor C3.

[0071] When the third variable inductor component L3 is connected between the first and second ports of the third detection port group A3, it is used to detect the third power supply performance parameters of the power supply detection circuit.

[0072] Alternatively, at least one detection port group includes a fourth detection port group A4, the first port of the fourth detection port group A4 is connected to the third node 3, the second port of the fourth detection port group A4 is connected to the fourth node 4, and the fourth node 4 is the common node of the first load terminal of the load capacitor C3 and the first load terminal of the load resistor R.

[0073] When the fourth variable inductor component L4 is connected between the first and second ports of the fourth detection port group A4, it is used to detect the fourth power supply performance parameter of the power supply detection circuit.

[0074] exist Figure 4 The power detection circuit diagram shown includes four detection port groups, one of which is a third detection port group A3. In this embodiment, the third detection port group A3 is used as the target detection port group for explanation. The load in the power detection circuit of this embodiment includes a parallel output capacitor C2, a load capacitor C3, and a load resistor R. In the power detection circuit, when the load current is large and the load current changes rapidly, remote feedback is required for adjustment. In the power detection circuit of this embodiment, the location of the remote feedback point is determined as follows: the first port of the third detection port group A3 is connected to the second node 2, the second port of the third detection port group A3 is connected to the third node 3, a third variable inductor component L3 is connected between the first port and the second port of the third detection port group A3, and the first ports and second ports of the other detection port groups are short-circuited. During the testing process, the inductance value of the third variable inductor component L3 is changed. Based on the inductance value of the third variable inductor component L3, the location of the remote feedback point on the printed circuit board is determined. The inductance value is directly proportional to the distance from the remote feedback point to the power supply VCC; that is, the larger the inductance value of the third variable inductor component L3, the farther the location of the remote feedback point on the printed circuit board is from the power supply VCC. In practical circuit applications, a larger inductance value of the third variable inductor component L3 results in a longer wire length between the remote feedback point and the power supply VCC. Since remote feedback can reduce the voltage drop of the power supply VCC during load current fluctuations, the performance of multiple remote feedback points during the testing process can be judged based on the test voltage drop value, thereby obtaining the accurate location of the remote feedback point.

[0075] In such Figure 5The power detection circuit diagram shown includes four detection port groups, including a fourth detection port group A4. In this embodiment, the fourth detection port group A4 is used as the target detection port group for explanation. The first port of the fourth detection port group A4 is connected to the third node 3, the second port of the fourth detection port group A4 is connected to the fourth node 4, and the first and second ports of the fourth detection port group A4 are connected to the fourth variable inductor component L4. The first and second ports of the other detection port groups are short-circuited. During the detection process, based on the size of the fourth variable inductor component L4, the benefit of connecting the first detection terminal of the conversion sub-circuit 5 to the first detection terminal of the load capacitor C3 is evaluated. Based on the benefit, it is determined whether the first detection terminal of the conversion sub-circuit 5 is connected to the first detection terminal of the load capacitor C3 or the first detection terminal of the load resistor R, and whether the second detection terminal of the conversion sub-circuit 5 is connected to the second detection terminal of the load capacitor C3 or the second detection terminal of the load resistor R.

[0076] In the above embodiment, a detection port group is used as an example for illustration. However, the target detection port group in the power detection circuit is not limited to a target detection port group. In other embodiments, a certain number of port groups of 2, 3, 5 or more can be set according to the specific detection target requirements.

[0077] refer to Figure 6 , Figure 6 The circuit diagram of the variable inductor component in another embodiment of this application is shown. In the power detection circuit described in the above embodiment, the variable inductor component includes at least one standard parasitic inductance unit L6. When the variable inductor component has multiple standard parasitic inductance units L6, the multiple standard parasitic inductance units L6 are connected in series and / or in parallel to enable the variable inductor component to have a target inductance value.

[0078] In the power detection circuit of the above embodiment, the variable inductor component includes at least one standard parasitic inductance unit L6. If the variable inductor component includes multiple standard parasitic inductance units L6, the multiple standard parasitic inductance units are connected in series and / or in parallel to obtain the target parasitic inductance value. Figure 6 This is a circuit diagram of the variable inductor component in this embodiment. The variable inductor component is obtained by connecting three standard parasitic inductance units L6 in series and parallel to achieve the target parasitic inductance value. The parasitic inductance value of the standard parasitic inductance unit L6 can be based on the formula:

[0079] L=0.0002*N*{Ln[2N / (W+H)]+0.2235[(W+H) / N]+0.5}

[0080] Where L is the parasitic inductance value of the standard parasitic inductance unit L6, N is the length of the standard parasitic inductance unit L6, W is the width of the standard parasitic inductance unit L6, and H is the thickness of the standard parasitic inductance unit L6, with L in μH and W, L, and H in mm. The thickness of printed circuit board traces is often relatively fixed, such as 35 μm. Furthermore, to meet the current carrying capacity W of the power supply, the value of H has a relatively small impact on the parasitic inductance. Therefore, the formula can be simplified to:

[0081] L=0.0002*N*[Ln(2N / W)+0.2235*W / N+0.5]

[0082] Furthermore, if we calculate the parasitic inductance of a trace with a length of 10mm and a width of 20mm, it is: 0.001894uH (1.8Nh).

[0083] The variable inductance component is obtained by connecting standard parasitic inductance units L6 in series and / or in parallel, and the inductance value of the variable inductance component can be changed based on the simulated inductance value of the target detection port group. The standard parasitic inductance unit L6 constituting the variable inductance component can be reused multiple times.

[0084] In the power detection circuit of the above embodiments of this application, the conversion sub-circuit 5 includes one of a low dropout linear regulator circuit, a buck converter circuit, and a boost converter circuit.

[0085] refer to Figure 7 , Figure 7 The circuit diagram of a power detection circuit provided in another embodiment of this application shows that the conversion sub-circuit 5 in the figure is a synchronous switching buck converter circuit in a buck converter circuit. In this power detection circuit, the synchronous switching buck converter circuit includes: switching transistors Q1 and Q2, inductor L6, feedback resistors R1 and R2, feedback circuit, switching transistor drive module PWM, and reference voltage VREF.

[0086] refer to Figure 8 , Figure 8 The circuit diagram of a power detection circuit provided in another embodiment of this application shows that the conversion sub-circuit 5 in the figure is an asynchronous switching buck converter circuit in a buck converter circuit. In this power detection circuit, the asynchronous switching buck converter circuit includes: a switching transistor Q1, an inductor L6, a feedback circuit, feedback resistors R1 / R2, a freewheeling diode D, a switching transistor drive module PWM, and a reference voltage VREF.

[0087] In the power supply detection circuit including the buck converter circuit described above, when one end of the feedback resistor R1 in the converter sub-circuit 5 is connected to the first load terminal of the output capacitor C2, the feedback in the power supply detection circuit is near-end feedback; when one end of the feedback resistor R1 in the converter sub-circuit 5 is connected to the first load terminal of the load capacitor C3 or the first load terminal of the load resistor R, the feedback in the power supply detection circuit is far-end feedback.

[0088] refer to Figure 9 , Figure 9 The circuit diagram of a power detection circuit provided in another embodiment of this application shows that the conversion sub-circuit 5 in the figure is a synchronous switching buck converter circuit in a boost converter circuit. In this power detection circuit, the synchronous switching buck converter circuit includes: switching transistors Q1 and Q2, inductor L6, feedback circuit, feedback resistors R1 and R2, switching transistor drive module PWM, and reference voltage VREF.

[0089] refer to Figure 10 , Figure 10 The circuit diagram of a power detection circuit provided in another embodiment of this application shows that the conversion sub-circuit 5 in the figure is an asynchronous switching buck converter circuit in a boost converter circuit. In this power detection circuit, the asynchronous switching buck converter circuit includes: a switching transistor Q1, an inductor L6, a feedback circuit, feedback resistors R1 / R2, a freewheeling diode D, a switching transistor drive module PWM, and a reference voltage VREF.

[0090] In the power detection circuit including the boost converter circuit described above, when one end of the feedback resistor R1 in the converter sub-circuit 5 is connected to the first load terminal of the output capacitor C2, the feedback in the power detection circuit is near-end feedback; when one end of the feedback resistor R1 in the converter sub-circuit 5 is connected to the first load terminal of the load capacitor C3 or the first load terminal of the load resistor R, the feedback in the power detection circuit is far-end feedback, and the far-end feedback of this circuit is used less frequently in applications.

[0091] refer to Figure 11 , Figure 11 The circuit diagram of a power detection circuit provided in another embodiment of this application is shown. In the figure, the conversion sub-circuit 5 is a low dropout linear regulator circuit, which includes: adjustment transistor Q1, error amplifier EA and reference voltage VREF.

[0092] In the power detection circuit including the boost converter circuit described above, when one end of the feedback resistor R1 in the converter sub-circuit 5 is connected to the first load terminal of the output capacitor C2, the feedback in the power detection circuit is near-end feedback; when one end of the feedback resistor R1 in the converter sub-circuit 5 is connected to the first load terminal of the load capacitor C3 or the first load terminal of the load resistor R, the feedback in the power detection circuit is far-end feedback, and the far-end feedback of this circuit is used less frequently in applications.

[0093] refer to Figure 12 , Figure 12 This application provides a flowchart of a power supply detection method according to another embodiment. Another embodiment also proposes a detection method for a power supply detection circuit. The power supply detection circuit has at least one detection port group, including a first port and a second port. Different detection port groups correspond to different detection targets. The detection method includes:

[0094] Step S1: Select the corresponding detection port group as the target detection port group according to the detection target;

[0095] Step S2: Connect a variable inductor between the first and second ports of the target detection port group, short-circuit the first and second ports of other detection port groups, and then detect the power supply performance parameters.

[0096] Step S3: By adjusting the connected variable inductor component, different inductance values ​​are obtained, and the power performance parameters corresponding to the detection target under different inductance values ​​are obtained.

[0097] Based on the above detection circuit, another embodiment of this application proposes a detection method for a power supply detection circuit. In this detection method, based on the detection target, a detection port group corresponding to the detection target is selected, a corresponding variable inductor component is connected to the detection port group, and the inductance value of the variable inductor component is adjusted to obtain the power supply performance parameters under different inductance values.

[0098] In the detection method described in the above embodiments, when the power performance parameters corresponding to the current detection target are optimal, the optimal inductance value of the variable inductor component is obtained, and the optimal inductance value is used as the parasitic inductance design value of the line corresponding to the location of the current detection port group in the power application circuit.

[0099] In the detection method described in the above embodiments, the variable inductor component includes at least one standard parasitic inductor unit L6;

[0100] When a variable inductor component has multiple standard parasitic inductance units L6, the multiple standard parasitic inductance units L6 are connected in series and / or in parallel to form a variable inductor component;

[0101] The inductance value of the variable inductor assembly can be adjusted by changing the number and / or connection relationship of the standard parasitic inductance units L6 within the variable inductor assembly.

[0102] Among them, the standard parasitic inductance unit L6 that constitutes the variable inductance component can be reused.

[0103] Based on the above, this application proposes a power supply detection circuit and detection method. In the power supply detection circuit, at least one detection port group is set between the positive terminal of the power supply VCC and the first load terminal. The detection port group is used to connect a variable inductor component, and the inductance value of the variable inductor component can be changed based on the simulated inductance value. The variable inductor component is detachably connected to the target detection port group, and the first and second ports of the other detection port groups are short-circuited. Different detection port groups correspond to different detection targets, and the inductance values ​​of the variable inductors connected to the detection port groups are different, resulting in different power supply performance parameters. By changing the inductance value of the variable inductor component connected to the target detection port group, the power supply performance parameters corresponding to the target detection port group under different inductance values ​​can be obtained, thus obtaining the optimal power supply performance parameters. This yields the optimal inductance value at each detection position in the power supply detection circuit, and the optimal inductance value at each detection position is the design inductance value of the power supply circuit in actual application. The power detection circuit includes multiple detection port groups, corresponding to multiple power performance parameters, including power input linear regulation, feedback loop stability, determination of the location of the far-end feedback point in the circuit, power output regulation, output voltage regulation, ripple, and other indicators. The standard parasitic inductor unit L6 that constitutes the variable inductor component is reusable.

[0104] The various embodiments in this specification are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. Regarding the methods disclosed in the embodiments, since they correspond to the circuits disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0105] It should be noted that, in the description of this application, the drawings and embodiments are illustrative rather than restrictive. The same reference numerals throughout the embodiments identify the same structures. Additionally, for ease of understanding and description, the thicknesses of some layers, films, panels, regions, etc., may be exaggerated in the drawings. It is also understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, the element may be directly on the other element or there may be intermediate elements. Furthermore, "on" means positioning an element on or below another element, but does not inherently mean positioning it above another element according to the direction of gravity.

[0106] The terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the middle.

[0107] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0108] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply detection circuit, the power supply detection circuit comprising: power supply; The load has a first load terminal and a second load terminal, the second load terminal being connected to the negative terminal of the power supply; At least one detection port group is connected between the positive terminal of the power supply and the first load terminal, the detection port group including a first port and a second port; In the detection state, the variable inductor component is detachably connected between the first and second ports of one of the detection port groups; the first and second ports of the other detection port groups are short-circuited. Different detection port groups correspond to different detection targets, and the inductance values ​​of the variable inductor components connected to the detection port groups are different, resulting in different power supply performance parameters. Different power supply performance parameters characterize different detection targets.

2. The power detection circuit according to claim 1, further comprising: A first capacitor connected between the positive and negative terminals of the power supply; The converter circuit has an input terminal, an output terminal, a first detection terminal, and a second detection terminal; The first detection terminal of the conversion sub-circuit is connected to the first load terminal, and the second detection terminal of the conversion sub-circuit is connected to the second load terminal; the input terminal of the conversion sub-circuit is coupled to the positive terminal of the power supply.

3. The power detection circuit according to claim 2, wherein the conversion sub-circuit comprises: One of the following: low dropout linear regulator circuit, buck converter circuit, and boost converter circuit.

4. The power detection circuit according to claim 2, wherein the at least one detection port group includes a first detection port group, a first port of the first detection port group is connected to a first node, and a second port of the first detection port group is connected to the input terminal of the conversion sub-circuit; the first node is the common node of the positive electrode and the first capacitor; When a first variable inductor component is connected between the first port and the second port of the first detection port group, it is used to detect the first power performance parameter of the power detection circuit.

5. The power detection circuit according to claim 2, wherein the at least one detection port group includes a second detection port group, the first port of the second detection port group is connected to the output terminal of the conversion sub-circuit, and the second port of the second detection port group is connected to the second node; The second node is the common node between the output terminal of the conversion sub-circuit and the first load terminal; When a second variable inductor component is connected between the first and second ports of the second detection port group, it is used to detect the second power performance parameter of the power detection circuit.

6. The power detection circuit according to claim 5, wherein the load includes an output capacitor, a load capacitor, and a load resistor connected in parallel; The at least one detection port group includes a third detection port group, the first port of the third detection port group is connected to the second node, the second port of the third detection port group is connected to the third node, and the third node is a common node of the first load terminal of the output capacitor and the first load terminal of the load capacitor. When a third variable inductor component is connected between the first port and the second port of the third detection port group, it is used to detect the third power performance parameter of the power detection circuit. Alternatively, the at least one detection port group includes a fourth detection port group, the first port of the fourth detection port group is connected to the third node, the second port of the fourth detection port group is connected to the fourth node, and the fourth node is a common node of the first load terminal of the load capacitor and the first load terminal of the load resistor; When a fourth variable inductor component is connected between the first and second ports of the fourth detection port group, it is used to detect the fourth power performance parameter of the power detection circuit.

7. The power detection circuit according to claim 1, wherein the inductor assembly includes at least one standard parasitic inductor unit; When the inductor assembly has multiple standard parasitic inductance units, the multiple standard parasitic inductance units are connected in series and / or in parallel so that the inductor assembly has a target inductance value.

8. A detection method for a power supply detection circuit, the power supply detection circuit having at least one detection port group, the detection port group including a first port and a second port, different detection port groups corresponding to different detection targets, the detection method comprising: Based on the detection target, select the corresponding detection port group as the target detection port group; A variable inductor is connected between the first and second ports of the target detection port group. After shorting the first and second ports of the other detection port groups, the power supply performance parameters are detected. By adjusting the connected variable inductor component, different inductance values ​​are obtained, and the power performance parameters corresponding to the detection target under different inductance values ​​are obtained.

9. The detection method according to claim 8, obtaining the optimal inductance value of the variable inductor component when the power performance parameters corresponding to the current detection target are optimal, and using the optimal inductance value as the parasitic inductance design value of the line corresponding to the location of the current detection port group in the power application circuit.

10. The detection method according to claim 8, wherein the variable inductance component comprises at least one standard parasitic inductance unit; When the variable inductor assembly has multiple standard parasitic inductor units, the multiple standard parasitic inductor units are connected in series and / or in parallel to form the variable inductor assembly; The inductance value of the variable inductor component can be adjusted by changing the number and / or connection relationship of the standard parasitic inductor units within the variable inductor component.

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