Power supply voltage bias circuit, test system and power supply voltage bias method

Abstract

The invention provides a power supply voltage biasing circuit which can be applied to the technical field of circuits. The power supply voltage bias circuit includes: a controller; a first adjusting unit and a second adjusting unit; the control ends of the first adjusting unit and the second adjusting unit are respectively connected to the first output end and the second output end of the controller; the first adjusting unit is used for adjusting a resistance value between the first end and the second end of the feedback unit under the control of a first control signal from the first output end of the controller and a target voltage, so that the target voltage is negatively biased; and the second adjusting unit is used for adjusting the resistance value between the second end and the third end of the feedback unit under the control of a second control signal from the second output end of the controller, so that the target voltage is positively biased. The invention also provides a test system and a power supply voltage bias method.

Description

Technical Field

[0001] This application relates to the field of circuit technologies, and particularly to a power supply voltage biasing circuit, a test system, and a power supply voltage biasing method. Background Art

[0002] For a power supply used to supply power to a circuit board, it is usually necessary to perform a biasing test on the power supply. The biasing test refers to controlling the output voltage of the power supply to perform forward biasing or reverse biasing, so as to verify the stability of the power supply operation. However, in the related art, the efficiency of controlling the output voltage of the power supply for biasing is low and the flexibility is poor. Summary of the Invention

[0003] In view of the above problems, this application provides a power supply voltage biasing circuit, a test system, and a power supply voltage biasing method.

[0004] According to the first aspect of this application, a power supply voltage biasing circuit is provided. The feedback unit of the power supply is used to output a target voltage to an output node. The power supply voltage biasing circuit includes: a controller; a first adjustment unit and a second adjustment unit; the control terminals of the first adjustment unit and the second adjustment unit are respectively connected to the first output terminal and the second output terminal of the controller; the first adjustment unit is used to adjust the resistance value between the first end and the second end of the feedback unit under the control of a first control signal from the first output terminal of the controller and the target voltage, so that the target voltage is negatively biased; the second adjustment unit is used to adjust the resistance value between the second end and the third end of the feedback unit under the control of a second control signal from the second output terminal of the controller, so that the target voltage is positively biased.

[0005] The second aspect of this application provides a test system, including: a power supply under test, the feedback unit of the power supply under test is used to output a target voltage to an output node; and the power supply voltage biasing circuit as described above, the power supply voltage biasing circuit is used to control the target voltage of the output node to be positively biased or negatively biased.

[0006] The third aspect of this application provides a power supply voltage biasing method, including: adjusting the resistance value between the first end and the second end of the feedback unit under the control of the target voltage and a first control signal from the controller, so that the target voltage is negatively biased; adjusting the resistance value between the second end and the third end of the feedback unit under the control of a second control signal from the controller, so that the target voltage is positively biased.

[0007] According to an embodiment of the present application, by using a target voltage and a first control signal to control a first adjustment unit to adjust the resistance value of a feedback unit, the target voltage can be negatively biased. Moreover, by using a second control signal to control a second adjustment unit to adjust the resistance value of the feedback unit, the target voltage can be positively biased. Thus, only by sending different adjustment signals to different adjustment units, positive bias testing or negative bias testing can be performed, improving the efficiency and flexibility of controlling the power supply voltage bias. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Through the following description of the embodiments of the present application with reference to the drawings, the above content and other objects, features, and advantages of the present application will become clearer. In the drawings:

[0009] Figure 1 Schematically shows a schematic diagram of a power supply voltage bias circuit according to an embodiment of the present application;

[0010] Figure 2 Schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application;

[0011] Figure 3 Schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application;

[0012] Figure 4 Schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application;

[0013] Figure 5 Schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application;

[0014] Figure 6 Schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application;

[0015] Figure 7 Schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application;

[0016] Figure 8 Schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application;

[0017] Figure 9 Schematically shows a schematic diagram of a test system according to an embodiment of the present application;

[0018] Figure 10 Schematically shows a schematic diagram of a controller according to an embodiment of the present application;

[0019] Figure 11 Schematically shows a schematic diagram of a power supply voltage bias method according to an embodiment of the present application. Detailed implementation manners

[0020] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present application. In the following detailed description, for the sake of explanation, numerous specific details are set forth in order to provide a comprehensive understanding of the embodiments of the present application. However, obviously, one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of the present application.

[0021] The terms used herein are merely for describing specific embodiments and are not intended to limit the present application. The terms "including", "comprising", etc. used herein indicate the presence of the described features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0022] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0023] In the case of using expressions such as "at least one of A, B, and C, etc.", generally, it should be interpreted according to the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include, but is not limited to, a system having only A, only B, only C, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0024] Figure 1 A schematic diagram of a power supply voltage biasing circuit according to an embodiment of the present application is schematically shown. As Figure 1 shown, the power supply voltage biasing circuit 100 of this embodiment includes a controller CTRL, a first adjustment unit AD11, and a second adjustment unit AD12.

[0025] In the embodiment of the present application, the controller CTRL can output a first control signal through the first output terminal of the controller CTRL and output a second control signal through the second output terminal of the controller CTRL. The control terminal CON1 of the first adjustment unit AD11 and the control terminal CON2 of the second adjustment unit AD12 are respectively connected to the first output terminal and the second output terminal of the controller CTRL. In this way, the first adjustment unit AD11 can receive the first control signal from the first output terminal of the controller CTRL. The second adjustment unit AD12 can receive the second control signal from the controller CTRL. It should be supplemented that when the first control signal is at an effective level ("1"), the second control signal should be at an invalid level ("0"), and vice versa. In this way, the first adjustment unit AD11 and the second adjustment unit AD12 can adjust the resistance value of the feedback unit FB1 of the power supply POWER at different time periods respectively. The feedback unit FB1 of the power supply POWER can adjust the initial voltage output by the power supply POWER to a target voltage and output the target voltage to the output node VOUT. For example, the power supply POWER can be a POL (Point of Load power supply) of a server.

[0026] When the first adjustment unit AD11 or the second adjustment unit AD12 is working, the resistance value of the feedback unit FB1 of the power supply POWER changes after being adjusted by the first adjustment unit AD11 or the second adjustment unit AD12, so that the target voltage can be forward-biased or reverse-biased. It should be understood that the target voltage can be understood as the voltage when the power supply POWER is working normally. In this way, forward biasing can mean that the voltage value of the output node VOUT is higher than the value of the target voltage, that is, higher than the voltage value when the power supply POWER is working normally; reverse biasing can mean that the voltage value of the output node VOUT is lower than the value of the target voltage, that is, lower than the voltage value when the power supply POWER is working normally. In this way, the positive bias test or the negative bias test for the power supply POWER can be completed.

[0027] Specifically, the first end of the first adjustment unit AD11 and the first end of the feedback unit FB1 are connected to the output node VOUT. The second end of the first adjustment unit AD11, the second end of the feedback unit FB1, and the first end of the second adjustment unit AD12 are connected to the connection node CT. The third end of the feedback unit FB1 and the second end of the second adjustment unit AD12 are connected to the ground terminal GND. Through such connection, under the control of the first control signal from the first output terminal of the controller CTRL and the target voltage, the first adjustment unit AD11 can adjust the resistance value between the first end and the second end of the feedback unit FB1, so that the target voltage is negatively biased. For example, under the control of the first control signal and the target voltage, the first adjustment unit AD11 can connect itself in parallel with the feedback unit FB1 via the first end and the second end of the feedback unit FB1, thereby adjusting the resistance value between the first end and the second end of the feedback unit FB1, so that the target voltage is negatively biased.

[0028] Under the control of the second control signal from the second output terminal of the controller CTRL, the second adjustment unit AD12 can adjust the resistance value between the second end and the third end of the feedback unit FB1, so that the target voltage is positively biased. For example, under the control of the second control signal, the second adjustment unit AD12 can connect itself in parallel with the feedback unit FB1 via the second end and the third end of the feedback unit FB1, thereby adjusting the resistance value between the second end and the third end of the feedback unit FB1, so that the target voltage is positively biased.

[0029] According to an embodiment of the present application, by using the target voltage and the first control signal to control the first adjustment unit AD11 to adjust the resistance value of the feedback unit FB1, the target voltage can be negatively biased. And, by using the second control signal to control the second adjustment unit AD11 to adjust the resistance value of the feedback unit FB1, the target voltage can be positively biased. Thus, only by sending different adjustment signals to different adjustment units can positive bias testing or negative bias testing be performed, improving the efficiency and flexibility of controlling the power supply voltage bias.

[0030] Figure 2 FIG. schematically shows a schematic diagram of a power supply voltage bias circuit according to another embodiment of the present application.

[0031] In Figure 2In the shown power supply voltage biasing circuit 200, the first adjustment unit AD21 may include a first adjustment subunit AD21_1 and a second adjustment subunit AD21_2. The control terminal CON1 of the first adjustment subunit AD21_1 is connected to the first output terminal of the controller CTRL, and may receive a first control signal via the first output terminal of the controller CTRL. The first terminal of the first adjustment subunit AD21_1 is connected to the ground terminal GND, the second terminal of the first adjustment subunit AD21_1 is connected to the control terminal of the second adjustment subunit AD21_2, and the third terminal of the first adjustment subunit AD21_1 is connected to the output node VOUT. Thus, under the control of the first control signal, the first adjustment subunit AD21_1 may use the target voltage to control the second adjustment subunit AD21_2 to stop working, or use the target voltage and the ground voltage of the ground terminal GND to control the second adjustment subunit AD21_2 to work. For example, when the first control signal is at an invalid level (“0”), the first adjustment unit AD21 may use the target voltage to control the second adjustment subunit AD21_2 to stop working. When the first control signal is at a valid level (“1”), the first adjustment subunit AD21_1 may use the target voltage and the ground voltage of the ground terminal GND to control the second adjustment subunit AD21_2 to work.

[0032] The first terminal of the second adjustment subunit AD21_2 is also connected to the output node VOUT, and the second terminal of the second adjustment subunit AD21_2 is connected to the connection node CT. Thus, under the control of the first adjustment subunit AD21_1, the second adjustment subunit AD21_2 works. In this case, the second adjustment subunit AD21_2 is connected in parallel with the feedback unit FB2 via the connection node CT and the output node VOUT, so that the target voltage is negatively biased.

[0033] Based on this, by using the first adjustment subunit AD21_1 to control the operation of the second adjustment subunit AD21_2 according to the first control signal using the target voltage and the ground voltage, the flexibility and efficiency of controlling the negative biasing of the power supply voltage are improved.

[0034] In Figure 2 the embodiment, the functions and connection manners of the power supply POWER, the feedback unit FB2, and the second adjustment unit AD22 may refer to the foregoing description and will not be elaborated herein.

[0035] Figure 3 Schematically shows a schematic diagram of a power supply voltage biasing circuit according to another embodiment of the present application.

[0036] In Figure 3In the shown power supply voltage biasing circuit 300, the first adjustment sub-unit AD31_1 includes a first voltage dividing resistor RP1 and a first transistor Q1. For example, the first transistor Q1 may be an N-type field effect transistor. The resistance value of the first voltage dividing resistor RP1 may be 10 kΩ. It should be understood that this application is not limited thereto.

[0037] The control terminal CON1 of the first transistor Q1 is connected to the first output terminal of the controller CTRL, and can receive a first control signal via the first output terminal of the controller CTRL. The first terminal of the first transistor Q1 is connected to the ground terminal GND, the second terminal of the first transistor Q1 and the first terminal of the first voltage dividing resistor RP1 are connected to the control terminal of the second adjustment sub-unit AD31_2, and the second terminal of the first voltage dividing resistor RP1 is connected to the output node VOUT. Thus, when the first control signal is at an effective level ("1"), the first transistor Q1 can electrically connect between the first terminal of the first voltage dividing resistor RP1 and the ground terminal GND. For example, when electrically connected between the first terminal of the first voltage dividing resistor RP1 and the ground terminal GND, the voltage of the first terminal of the first voltage dividing resistor RP1 can be pulled down by the ground voltage of the ground terminal GND, that is, the voltage of the control terminal of the second adjustment sub-unit AD31_2 is pulled down, and the voltage between the first terminal and the second terminal of the first voltage dividing resistor RP1 is adjusted to increase. In this case, the second adjustment sub-unit AD31_2 can operate, so as to be connected in parallel with the feedback unit FB3 via the output node VOUT and the connection node CT.

[0038] For example, when the first control signal is at an invalid level ("0"), the first transistor Q1 can disconnect the electrical connection between the first terminal of the first voltage dividing resistor RP1 and the ground terminal GND. Thus, the voltage of the control terminal of the second adjustment sub-unit AD31_2 can be pulled up via the first voltage dividing resistor RP1, and the voltage between the first terminal and the second terminal of the first voltage dividing resistor RP1 decreases, so that the second adjustment sub-unit AD31_2 can be controlled to disconnect from the feedback unit FB3 in parallel. Based on this, by using the ground voltage to pull down the voltage of the control terminal of the second adjustment sub-unit AD31_2 to control the operation of the second adjustment sub-unit AD31_2, and by using the target voltage to pull up the voltage of the control terminal of the second adjustment sub-unit AD31_2 to control the second adjustment sub-unit AD31_2 to stop operating, the flexibility and efficiency of controlling the negative biasing of the power supply voltage are improved.

[0039] Moreover, the control terminal CON1 of the first transistor Q1 is also connected to the ground terminal GND via the first ground resistor RG1. In this way, when the first control signal changes from the effective level (“1”) to the ineffective level (“0”), the voltage of the control terminal CON1 of the first transistor Q1 is transmitted to the ground terminal GND via the third voltage-dividing resistor RP3, thereby pulling down the voltage of the control terminal of the first transistor Q1. The first transistor Q1 returns to the cut-off state, causing the second adjustment subunit AD31_2 to stop operating under the control of the target voltage.

[0040] In Figure 3 the embodiments of, the functions and connection manners of the power supply POWER, the feedback unit FB3, the second adjustment subunit AD31_2, and the second adjustment unit AD32 may refer to the foregoing descriptions and will not be elaborated herein.

[0041] Figure 4 FIG. schematically shows a schematic diagram of a power supply voltage biasing circuit according to another embodiment of the present application. In Figure 4 the shown power supply voltage biasing circuit 400, the second adjustment subunit AD41_2 includes a second transistor Q2 and a second voltage-dividing resistor RP2. For example, the second transistor Q2 may be a P-type field-effect transistor. For example, the resistance value of the second voltage-dividing resistor RP2 may be 10 kΩ. It should be understood that the present application is not limited thereto.

[0042] The control terminal of the second transistor Q2 is connected to the second terminal of the first adjustment subunit AD41_1. In this way, the second transistor Q2 can be controlled by the target voltage or by the target voltage and the ground voltage of the ground terminal GND.

[0043] The first terminal of the second transistor Q2 is connected to the first terminal of the second voltage-dividing resistor RP2, the second terminal of the second voltage-dividing resistor RP2 is connected to the output node VOUT, and the second terminal of the second transistor Q2 is connected to the connection node CT. In this way, under the control of the target voltage and the ground voltage of the ground terminal GND, the second transistor Q2 can electrically connect between the first terminal and the second terminal of the second transistor Q2, thereby connecting the second voltage-dividing resistor RP2 in parallel with the feedback unit FB4 and reducing the equivalent resistance value between the first terminal and the second terminal of the feedback unit FB4, causing the target voltage to be negatively biased. Alternatively, under the control of the target voltage, the second transistor Q2 can disconnect the electrical connection between the first terminal and the second terminal of the second transistor Q2, thereby disconnecting the second voltage-dividing resistor RP2 from being connected in parallel with the feedback unit FB4 to stop the negative biasing of the target voltage.

[0044] Specifically, when the first control signal is at the effective level ("1"), the first transistor Q1 electrically connects the first end of the first voltage-dividing resistor RP1 to the ground terminal GND, such that the gate-source voltage of the second transistor Q2 (i.e., the voltage between the first end and the second end of the first voltage-dividing resistor RG1) Vgs = -VOUT, where VOUT represents the voltage value of the output node VOUT. In this way, the second transistor Q2 is turned on due to the reverse biasing of the gate-source voltage, thereby controlling the second voltage-dividing resistor RP2 to be in parallel with the first feedback resistor RF1, reducing the equivalent resistance value of the first feedback resistor RF1, and thus reducing the voltage of the output node VOUT, achieving a negative bias of the target voltage. When the first control signal is at the invalid level ("0"), the first end of the first voltage-dividing resistor RP1 is not grounded, causing the voltage at the control end of the second transistor Q2 to be pulled up to the voltage value of the output node VOUT by the voltage at the first end of the first voltage-dividing resistor RP1. At this time, the gate-source voltage Vgs of the second transistor Q2 is 0, and the second transistor Q2 is turned off, disconnecting the electrical connection between the first end and the second end of the second transistor Q2.

[0045] It should be noted that in the embodiment of the present application, the second transistor Q2 is preferably a P-type field-effect transistor. This is because the first end of the second transistor Q2 is connected to the output node VOUT via the second voltage-dividing resistor RP2. Therefore, if the second transistor Q2 is an N-type field-effect transistor, a relatively large output node VOUT voltage is required to drive the second transistor Q2 to conduct, while using a P-type field-effect transistor can avoid this situation. Thus, flexible and efficient control of the negative bias of the target voltage can be achieved.

[0046] In Figure 4 the embodiment of, the functions and connection manners of the power supply POWER, the feedback unit FB4, the first voltage-dividing resistor RP1, the first transistor Q1, the first grounding resistor RG1, and the second adjustment unit AD42 can be referred to the previous description and will not be elaborated here.

[0047] Figure 5 Schematically shows a schematic diagram of a power supply voltage biasing circuit according to another embodiment of the present application. In Figure 5 the power supply voltage biasing circuit 500 shown, the second adjustment unit AD51 can include a third transistor Q3 and a third voltage-dividing resistor RP3. For example, the third transistor Q3 can be an N-type field-effect transistor. The resistance value of the third voltage-dividing resistor RP3 can be 10 kΩ. It should be understood that the present application is not limited thereto.

[0048] The control terminal CON2 of the third transistor Q3 is connected to the second output terminal of the controller CTRL and can receive a second control signal via the second output terminal of the controller CTRL. The first terminal of the third transistor Q3 is connected to the ground terminal GND, the second terminal of the third transistor Q3 is connected to the first terminal of the third voltage-dividing resistor RP3, and the second terminal of the third voltage-dividing resistor RP3 is connected to the connection node CT. In this way, under the control of the second control signal, the third transistor Q3 can electrically connect the first terminal of the third voltage-dividing resistor RP3 to the ground terminal GND, so that the third voltage-dividing resistor RP3 is connected in parallel with the feedback unit FB5 via the connection node CT and the ground terminal GND, making the target voltage forward-biased. For example, when the second control signal is at an effective level ("1"), the third transistor Q3 can electrically connect between the first terminal of the third voltage-dividing resistor RP3 and the ground terminal GND. When the second control signal is at an invalid level ("0"), the third transistor Q3 can disconnect the electrical connection between the first terminal of the third voltage-dividing resistor RP3 and the ground terminal GND. Based on this, by using the second control signal, the third transistor can be flexibly and efficiently controlled to connect and disconnect the parallel connection between the third voltage-dividing resistor and the feedback unit, improving the efficiency and accuracy of controlling the forward biasing of the target voltage.

[0049] In Figure 5 the embodiments of, the functions and connection manners of the power supply POWER, the feedback unit FB5, the first voltage-dividing resistor RP1, the second voltage-dividing resistor RP2, the first transistor Q1, the second transistor Q2, and the first ground resistor RG1 can be referred to the previous description and will not be elaborated here.

[0050] Figure 6 FIG. schematically shows a schematic diagram of a power supply voltage biasing circuit according to another embodiment of the present application. In Figure 6 the shown power supply voltage biasing circuit 600, the feedback unit FB6 can include a first feedback resistor RF1 and a second feedback resistor RF2.

[0051] The first terminal of the first feedback resistor RF1 and the first output terminal of the power supply POWER are connected to the output node VOUT. The second terminal of the first feedback resistor RF1 and the first terminal of the second feedback resistor RF2 are connected to the connection node CT. The second terminal of the second feedback resistor RF2 is connected to the ground terminal GND. The power supply POWER can output an initial voltage via the first output terminal and the second output terminal of the power supply POWER. The first feedback resistor RF1 and the second feedback resistor RF2 can adjust the initial voltage output by the power supply POWER to a target voltage. The power supply POWER can use the target voltage as the feedback voltage of the first feedback resistor RF1 and the second feedback resistor RF2.

[0052] The first end of the first adjustment unit AD61 is connected to the output node VOUT, and the second end of the first adjustment unit AD61 is connected to the connection node CT. In this way, under the control of the first control signal and the target voltage, the first adjustment unit AD61 can adjust the resistance value between the first end and the second end of the first feedback resistor RF1, so that the target voltage is negatively biased.

[0053] The first end of the second adjustment unit AD61 and the second end of the second adjustment unit AD61 are connected to the ground terminal GND. In this way, under the control of the second control signal, the second adjustment unit AD61 can adjust the resistance value between the first end and the second end of the second feedback resistor RF2, so that the target voltage is positively biased. Based on this, the positive bias or reverse bias of the target voltage can be controlled flexibly and efficiently.

[0054] In Figure 6 In the embodiment of, the functions and connection manners of the power supply POWER, the feedback unit FB6, the first voltage-dividing resistor RP1, the second voltage-dividing resistor RP2, the third voltage-dividing resistor RP3, the first transistor Q1, the second transistor Q2, the third transistor Q3, the first grounding resistor RG1, and the second grounding resistor RG2 may refer to the foregoing description and will not be elaborated herein.

[0055] The principle of the bias test of the present application will be further elaborated below.

[0056] In the embodiment of the present application, when both the first control signal and the second control signal are at the invalid level ("0"), the first adjustment unit and the second adjustment unit do not work, and both the first transistor and the third transistor are in the cut-off state. The voltage at the control end of the second transistor is pulled up to the target voltage under the control of the resistance voltage of the first voltage-dividing resistor. Since the second transistor is a P-type transistor, the second transistor is also in the cut-off state under the control of the target voltage.

[0057] The feedback unit without adjusting the resistance value can adjust the initial voltage output by the power supply to the target voltage. And, during this process, the feedback unit will not be affected by the internal resistance of the transistor, thus avoiding the voltage adjustment error caused by the transistor. The target voltage in this process can be calculated by the following formula (1):

[0058] (1)

[0059] In formula (1), Vout represents the target voltage, R1 represents the first feedback resistor, R2 represents the second feedback resistor, and VFB represents the feedback voltage fed back from the first feedback resistor and the second feedback resistor to the power supply, and this feedback voltage can be equivalent to a fixed reference voltage.

[0060] During the offset test, it is necessary to control the target voltage for forward bias or reverse bias. For example, it can be to control the target voltage for forward bias by 5% - 10% or reverse bias by 5% - 10%. For example, if the target voltage is 5V, then for the forward bias test, the voltage value of the output node needs to be adjusted to 5.25 to 5.5V, and for the negative bias test, the voltage value of the output node needs to be adjusted to 4.5 to 4.75V. For example, in the server field, it is generally necessary to control the target voltage for a 5% forward bias test and a 5% negative bias test.

[0061] When the first control signal is at the effective level ("1") and the second control signal is at the invalid level ("0"), the first transistor electrically connects between the first end of the first voltage-dividing resistor and the ground terminal, such that the gate-source voltage Vgs of the second transistor = -VOUT, where VOUT represents the voltage value of the output node. Thus, the second transistor is turned on due to the reverse bias of the gate-source voltage, thereby controlling the second voltage-dividing resistor to be in parallel with the first feedback resistor, reducing the equivalent resistance value of the first feedback resistor, and thus reducing the voltage of the output node, achieving the negative bias of the target voltage. For example, the resistance value of the second voltage-dividing resistor can be selected through the following formula (2):

[0062] (2)

[0063] In formula (2), R3 represents the resistance value of the second voltage-dividing resistor, R1 represents the resistance value of the first feedback resistor, R2 represents the resistance value of the second feedback resistor, and x represents the control coefficient of the bias. For example, when it is necessary to use the second voltage-dividing resistor to control the target voltage for a 5% negative bias, x takes a value of 0.05.

[0064] When the first control signal is at the invalid level ("0") and the second control signal is at the effective level ("1"), the third transistor electrically connects between the first end of the third voltage-dividing resistor and the ground terminal, thereby making the third voltage-dividing resistor in parallel with the second feedback resistor. Thus, the equivalent resistance value of the second feedback resistor can be reduced, and thus the voltage value of the output node can be increased. The resistance value of the third voltage-dividing resistor can be selected through the following formula (3):

[0065] (3)

[0066] In formula (3), R4 represents the resistance value of the third voltage-dividing resistor, R1 represents the resistance value of the first feedback resistor, R2 represents the resistance value of the second feedback resistor, and x represents the control coefficient of the bias. For example, when it is necessary to use the third voltage-dividing resistor to control the target voltage for a 5% forward bias, x takes a value of 0.05.

[0067] In an embodiment of the present application, the power supply voltage biasing circuit may include a plurality of first adjustment units. In this way, by sending a first control signal to one of the plurality of first adjustment units, the target first adjustment sub-unit among the plurality of first adjustment units can be selected to adjust the resistance value between the first end and the second end of the feedback voltage, so that the biasing of the power supply voltage can be controlled flexibly and efficiently. Among them, the resistance values adjusted by the plurality of first adjustment sub-units are different. For example, the plurality of first adjustment sub-units may include second voltage dividing resistors with different resistance values. Specifically, Figure 7 Schematically shows a schematic diagram of a power supply voltage biasing circuit according to another embodiment of the present application. As Figure 7 shown, the power supply voltage biasing circuit 700 includes a first adjustment sub-unit AD71_11 and a second adjustment sub-unit AD71_21 belonging to the same first adjustment unit, and a first adjustment sub-unit AD71_12 and a second adjustment sub-unit AD71_22 belonging to the same first adjustment unit. The first adjustment sub-unit AD71_11 may include a first voltage dividing resistor RP1_1, a first transistor Q1_1, and a first grounding resistor RG1_1; the second adjustment sub-unit AD71_21 may include a second voltage dividing resistor RP2_1 and a second transistor Q2_1; the first adjustment sub-unit AD71_12 may include a first voltage dividing resistor RP1_2, a first transistor Q1_2, and a first grounding resistor RG1_2; the second adjustment sub-unit AD71_22 may include a second voltage dividing resistor RP2_2 and a second transistor Q2_2. The functions and connection manners of the components in the first adjustment sub-unit AD71_11, the second adjustment sub-unit AD71_21, the first adjustment sub-unit AD71_12, and the second adjustment sub-unit AD71_22 may refer to the foregoing description and will not be elaborated here.

[0068] It is possible to select to send a first control signal to the control terminal CON1_1 of the first adjustment sub-unit AD71_11 to control the first adjustment sub-unit AD71_11 and the second adjustment sub-unit AD71_21 to adjust the voltage of the first feedback resistor RF1. When the first control signal changes from the effective level (“1”) to the invalid level (“0”), the first grounding resistor RG1_1 can pull down the voltage of the control terminal CON1_1 of the first adjustment sub-unit AD71_11 to control the first adjustment sub-unit AD71_11 and the second adjustment sub-unit AD71_21 to stop working.

[0069] Alternatively, it is possible to choose to send a first control signal to the control terminal CON1_2 of the second regulating subunit AD71_12 to control the first regulating subunit AD71_11 and the second regulating subunit AD71_21 to regulate the voltage of the first feedback resistor. In the case where the first control signal changes from the effective level (“1”) to the ineffective level (“0”), the first grounding resistor RG1_2 can pull down the voltage of the control terminal CON1_2 of the first regulating subunit AD71_12 to control the first regulating subunit AD71_12 and the second regulating subunit AD71_22 to stop working.

[0070] It should be added that the above is only an example. In fact, the number of the first regulating units can be even more, which will not be elaborated here. In Figure 7 the embodiment, the functions and connection manners of the power supply POWER, the first feedback resistor RF1, the second feedback resistor RF2, the third voltage-dividing resistor RP3, the third transistor Q3, and the second grounding resistor RG2 can be referred to the previous description and will not be elaborated here.

[0071] In the embodiment of the present application, the power supply voltage biasing circuit may include a plurality of second regulating units. In this way, by sending a second control signal to one of the plurality of second regulating units, the target second regulating subunit among the plurality of second regulating units can be selected to regulate the resistance value between the second end and the third end of the feedback voltage, so that the biasing of the power supply voltage can be controlled flexibly and efficiently. Among them, the resistance values regulated by the plurality of second regulating subunits are different. For example, the plurality of second regulating subunits may include third voltage-dividing resistors with different resistance values. Specifically, Figure 8 FIG. schematically shows a schematic diagram of a power supply voltage biasing circuit according to another embodiment of the present application. As Figure 8 shown, the power supply voltage biasing circuit 800 includes a second regulating unit AD82_1 and a second regulating unit AD82_2. The second regulating unit AD82_1 may include a third voltage-dividing resistor RP3_1 and a third transistor Q3_1; the second regulating unit AD82_2 may include a third voltage-dividing resistor RP3_2 and a third transistor Q3_2. The functions and connection manners of the components in the second regulating unit AD82_1 and the second regulating unit AD82_2 can be referred to the previous description and will not be elaborated here.

[0072] It is possible to choose to send a second control signal to the control terminal CON2_1 of the second regulating unit AD82_1 to control the second regulating unit AD82_1 to regulate the voltage of the second feedback resistor. In the case where the second control signal changes from the effective level to the ineffective level, the second grounding resistor RG2_1 can pull down the voltage of the control terminal CON2_1 of the second regulating unit AD82_1 to control the second regulating unit AD82_1 to stop working.

[0073] Alternatively, it is possible to choose to send a second control signal to the control terminal CON2_2 of the second adjustment unit AD82_2 to control the second adjustment unit AD82_2 to adjust the voltage of the second feedback resistor. In the case where the second control signal changes from the effective level to the invalid level, the second grounding resistor RG2_2 can pull down the voltage of the control terminal CON2_2 of the second adjustment unit AD82_2 to control the second adjustment unit AD82_2 to stop working.

[0074] It should be added that the above is only an example. In fact, the number of second adjustment units can be more, which will not be elaborated here. In Figure 8 the embodiment, the functions and connection manners of the power supply POWER, the first feedback resistor RF1, the second feedback resistor RF2, the first voltage dividing resistor RP1, the second voltage dividing resistor RP2, the first transistor Q1, the second transistor Q2, and the first grounding resistor RG1 can be referred to the previous description and will not be elaborated here.

[0075] Figure 9 Schematically shows a schematic diagram of a test system according to an embodiment of the present application. As Figure 9 shown, the test system 9000 of this embodiment includes a power supply under test POWER and a power supply voltage biasing circuit 900. The feedback unit FB9 of the power supply under test POWER can output a target voltage to the output node VOUT. The power supply voltage biasing circuit 900 can control the target voltage of the output node VOUT to be forward-biased or reverse-biased. In the embodiment of the present application, the power supply voltage biasing circuit 900 can be any one of the power supply voltage biasing circuits described above, which will not be elaborated here.

[0076] In the embodiment of the present application, there can be multiple power supplies under test, and the feedback units of the power supplies under test can include a first feedback resistor and a second feedback resistor. The power supply voltage biasing circuit can control the target voltage of the output node connected to at least one target power supply under test among the multiple power supplies under test to be forward-biased or reverse-biased via the first feedback resistor and the second feedback resistor. Specifically, Figure 10 Schematically shows a schematic diagram of a controller according to an embodiment of the present application. As Figure 10 shown, the controller 1000 of the power supply voltage biasing circuit includes a central processing unit 1010 and multiple extended control units 1020_1... 1020_N, where N is an integer greater than 1. For example, the central processing unit 1010 can be a CPU (Central Processing Unit). The extended control unit can be implemented based on GPIO (General-Purpose Input / Output Port).

[0077] The physical pins of the central processing unit 1010 are connected to the input ends of multiple extended control units 1020_1... 1020_N via a data bus (which can be an I2C bus for example). And the central processing unit 1010 can be configured with a program script. In this way, the user can send an instruction carrying the address information of the target extended control unit to the server through a terminal device. The server then sends a control instruction carrying this address information to the central processing unit 1010. The central processing unit 1010 can respond to this control instruction based on the configured program script, select the target extended control unit from multiple extended control units 1020_1... 1020_N according to the address information carried by this control instruction, and send an initial control signal to the target extended control unit. In the embodiment of the present application, the pin resources of the central processing unit 1010 are relatively important, so it is necessary to save the pins occupied by the central processing unit 1010 as much as possible. In this way, by using the data bus to connect the central processing unit 1010 and multiple extended control units 1020_1... 1020_N, and configuring multiple extended control units 1020_1... 1020_N with different addresses for distinction, at least one target extended control unit can be selected by using the address information to perform a bias test on the target power supply to be measured corresponding to this target extended control unit while only occupying two physical pins, namely SDA (data line) and SCL (control line), of the central processing unit 1010.

[0078] For example, the respective first output ends of multiple extended control units 1020_1... 1020_N are respectively connected to different first adjustment units in the power supply voltage bias circuit. The respective second output ends of multiple extended control units 1020_1... 1020_N are respectively connected to different second adjustment units in the power supply voltage bias circuit. The mutually corresponding first adjustment unit and second adjustment unit connected to the same extended control unit are respectively connected to the first feedback resistor and the second feedback resistor of the same power supply to be measured. In this way, the target extended control unit can, under the control of the initial control signal, send a first control signal to the target first adjustment unit connected to the target extended control unit to adjust the resistance value of the first feedback resistor of the target power supply to be measured among multiple power supplies to be measured through the target first adjustment unit. Or, the target extended control unit can, under the control of the initial control signal, send a second control signal to the target second adjustment unit connected to the target extended control unit to adjust the resistance value of the second feedback resistor of the target power supply to be measured among multiple power supplies to be measured through the target second adjustment unit. For example, the output interface of the target extended control unit can be configured in an output mode to output the first control signal or the second control signal.

[0079] Specifically, the expansion control unit can select a CPIO circuit board of model CA9555. This circuit board has a total of 16 GPIO pins and can control 8 groups of power supplies under test for bias testing.

[0080] In one embodiment, positive bias testing or negative bias testing can be simultaneously performed on all the power supplies under test connected to a single expansion control unit. In this way, the central control unit only needs two I2C instructions for a single expansion control unit to configure the output states of 16 GPIO pins. For example, the voltage of all the power supplies under test can be controlled to be positively biased through 16 GPIO pins first, and then the voltage of all the power supplies under test can be controlled to be negatively biased, so as to complete the bias testing of the power supply voltage. This testing method is relatively simple and fast. In another embodiment, assume that the number of power supplies under test is M, and M is a positive integer greater than 1. In this case, the logical combinations of positive bias and negative bias of M power supplies under test can be exhausted, that is, 2 M testing methods are used to test the M power supplies under test connected to a single expansion control unit, and the user can make these combined tests execute sequentially through a script. This testing method takes relatively longer time, but it can determine the coupling effect between positive bias and negative bias of different power supplies and has good robustness.

[0081] Based on the above content, it can be seen that by using the above controller to select the target unit under test for testing, the testing efficiency and flexibility are improved.

[0082] Figure 11 A schematic diagram of the power supply voltage bias method according to an embodiment of the present application is schematically shown. As Figure 11 shown, the power supply voltage bias method of this embodiment includes operations S1110 to S1120.

[0083] In operation S1110, under the control of the target voltage and the first control signal from the controller, the resistance value between the first end and the second end of the feedback unit is adjusted so that the target voltage is negatively biased.

[0084] In operation S1120, under the control of the second control signal from the controller, the resistance value between the second end and the third end of the feedback unit is adjusted so that the target voltage is positively biased.

[0085] In the embodiment of the present application, operations S1110 to S1120 are similar to the operations performed by the power supply voltage bias circuit described above and will not be elaborated here.

[0086] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a part of code, and the above-mentioned module, segment of a program, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, as well as combinations of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0087] Those skilled in the art can understand that the features described in the various embodiments of the present application can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in the present application. In particular, without departing from the spirit and teachings of the present application, the features described in the various embodiments of the present application can be combined and / or combined in various ways. All such combinations and / or combinations fall within the scope of the present application.

[0088] The embodiments of the present application have been described above. However, these embodiments are only for illustrative purposes and not for limiting the scope of the present application. Although the embodiments have been described separately above, this does not mean that the measures in the respective embodiments cannot be used advantageously in combination. Without departing from the scope of the present application, those skilled in the art can make various substitutions and modifications, and all such substitutions and modifications should fall within the scope of the present application.

Claims

1. A power supply voltage bias circuit, characterized in that: The feedback unit of the power supply is used to output a target voltage to an output node, and the power supply voltage bias circuit includes: Controller; A first regulating unit and a second regulating unit; control ends of the first regulating unit and the second regulating unit are respectively connected to a first output end and a second output end of the controller; The first regulating unit is used to regulate the resistance value between the first terminal and the second terminal of the feedback unit under the control of the first control signal from the first output terminal of the controller and the target voltage, so that the target voltage is negatively biased; The second regulating unit is used to regulate the resistance value between the second terminal and the third terminal of the feedback unit under the control of the second control signal from the second output terminal of the controller, so that the target voltage is forward biased.

2. The circuit according to claim 1, characterized in that The first regulating unit includes a first regulating subunit and a second regulating subunit; The control end of the first regulating subunit is connected to the first output end of the controller, the first end of the first regulating subunit is connected to the ground end, the second end of the first regulating subunit is connected to the control end of the second regulating subunit, the third end of the first regulating subunit, the first end of the second regulating subunit and the first end of the feedback unit are connected to the output node, and the second end of the second regulating subunit and the second end of the feedback unit are connected to the connection node; The first regulating subunit is used to connect the second regulating subunit in parallel with the feedback unit via the output node and the connection node using the target voltage and the ground voltage under the control of the first control signal, so as to negatively bias the target voltage.

3. The circuit according to claim 2, characterized in that The first regulating subunit includes a first voltage-dividing resistor and a first transistor; The control end of the first transistor is connected to the first output end of the controller, the first end of the first transistor is connected to the ground end, the second end of the first transistor and the first end of the first voltage-dividing resistor are connected to the control end of the second regulating subunit, and the second end of the first voltage-dividing resistor is connected to the output node; The first transistor is used to electrically connect the first end of the first voltage-dividing resistor and the ground end when the first control signal is at a valid level, so as to utilize the target voltage and the ground voltage to adjust the voltage between the first end and the second end of the first voltage-dividing resistor, so as to control the second regulating subunit to be connected in parallel with the feedback unit.

4. The circuit according to claim 3, characterized in that The first regulating subunit further includes a grounding resistor; The control terminal of the first transistor is connected to the ground terminal via the grounding resistor, so that when the first control signal changes from a valid level to an invalid level, the voltage of the control terminal of the first transistor is transmitted to the ground terminal via the third voltage-dividing resistor.

5. The circuit according to any one of claims 2 to 4, characterized in that: The second regulating subunit includes a second voltage-dividing resistor and a second transistor; The control end of the second transistor is connected to the second end of the first regulating subunit, the first end of the second transistor is connected to the output node via the second voltage-dividing resistor, and the second end of the second transistor is connected to the connection node; The second transistor is used to electrically connect the first end and the second end of the second transistor under the control of the target voltage and the voltage of the ground terminal, so as to connect the second voltage-dividing resistor in parallel with the feedback unit, so that the target voltage is negatively biased.

6. The circuit according to any one of claims 1 to 4, characterized in that: The second regulating unit includes a third transistor and a third voltage-dividing resistor; The control end of the third transistor is connected to the second output end of the controller, the second end of the third transistor is connected to the first end of the third voltage-dividing resistor, the second end of the third voltage-dividing resistor and the second end of the feedback unit are connected to the connection node, and the second end of the third transistor and the third end of the feedback unit are connected to the ground end; The third transistor is used to electrically connect the first end of the third voltage-dividing resistor to the ground end under the control of the second control signal, so as to connect the third voltage-dividing resistor in parallel with the feedback unit, so that the target voltage is forward biased.

7. The circuit according to any one of claims 1 to 4, characterized in that: The feedback unit includes a first feedback resistor and a second feedback resistor; The first end of the first feedback resistor, the first output end of the power supply and the first end of the first regulating unit are connected to the output node; The second end of the first feedback resistor, the second end of the first regulating unit, the first end of the second feedback resistor, and the first end of the second regulating unit are connected to a connection node; The second end of the second feedback resistor and the second end of the second regulating unit are connected to the ground terminal; the first feedback resistor and the second feedback resistor are used to adjust the initial voltage output by the power supply to the target voltage; The first adjustment unit is further used to adjust the resistance value between the first end and the second end of the first feedback resistor under the control of the first control signal and the target voltage, so that the target voltage is negatively biased; The second adjusting unit is further configured to adjust the resistance value between the second end and the third end of the second feedback resistor under the control of the second control signal so that the target voltage is forward biased.

8. A testing system comprising: A power supply to be tested, wherein a feedback unit of the power supply to be tested is used to output a target voltage to an output node; as well as According to any one of claims 1 to 7, the power supply voltage bias circuit is used to control the target voltage of the output node to be forward biased or negatively biased.

9. The test system according to claim 8, characterized in that: There are multiple power supplies to be tested, and the feedback unit of the power supplies to be tested includes a first feedback resistor and a second feedback resistor; The controller of the power supply voltage bias circuit includes a central processing unit and a plurality of extended control units, wherein the physical pins of the central processing unit are connected to the input ends of the plurality of extended control units via a data bus; the first output ends of the plurality of extended control units are respectively connected to different first adjustment units in the power supply voltage bias circuit; the second output ends of the plurality of extended control units are respectively connected to different second adjustment units in the power supply voltage bias circuit; The first regulating unit and the second regulating unit corresponding to each other connected to the same extended control unit are respectively connected to the first feedback resistor and the second feedback resistor of the same power supply to be tested; The central processing unit is used to respond to the control instruction, select a target extended control unit from the multiple extended control units according to the address information carried by the control instruction, and send an initial control signal to the target extended control unit; The target expansion control unit is used to send a first control signal to a target first adjustment unit connected to the target expansion control unit according to the initial control signal, so as to adjust the resistance value of a first feedback resistor of a target power supply to be tested among the multiple power supplies to be tested through the target first adjustment unit; or send a second control signal to a target second adjustment unit connected to the target expansion control unit, so as to adjust the resistance value of a second feedback resistor of the target power supply to be tested among the multiple power supplies to be tested through the target second adjustment unit.

10. A power supply voltage bias method, characterized in that: include: Under the control of the target voltage and a first control signal from the controller, adjusting the resistance value between the first terminal and the second terminal of the feedback unit so that the target voltage is negatively biased; Under the control of the second control signal from the controller, the resistance value between the second terminal and the third terminal of the feedback unit is adjusted so that the target voltage is forward biased.

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