Monitoring circuit for power supply connector, motherboard and server

Abstract

The application provides a monitoring circuit of a power supply connector, a host board and a server, and belongs to the technical field of computers.The monitoring circuit comprises a voltage conversion module, a voltage comparison module, a reference voltage module, a diode and a load resistor;the output end of the reference voltage module is electrically connected with the input end of the voltage conversion module and the first input end of the voltage comparison module;the output end of the voltage conversion module is electrically connected with the second input end of the voltage comparison module, the anode of the diode and the first end of the load resistor;the cathode of the diode is electrically connected with the voltage output end of the PSU;and the second end of the load resistor is grounded.In the case that the PSU connector is short-circuited, the voltage comparison module compares the size between the reference voltage and the voltage of the anode of the diode, determines that the voltage of the anode of the diode is smaller than the reference voltage, and outputs an indication voltage, which indicates that the PSU is prohibited from starting, so that the host board of the server is prevented from being burnt out and the safety is improved.

Description

Technical Field

[0001] This invention relates to the field of computer technology, and in particular to a monitoring circuit for a power supply connector, a motherboard, and a server. Background Technology

[0002] In servers, the power supply unit (PSU) connector is a passive component used by the server to connect to the PSU. Surrounding the PSU connector are multilayer ceramic capacitors (MLCCs). During the insertion and removal of the PSU, the pressure applied to the server's motherboard can cause it to bend and deform. If the applied pressure is too great, it can easily cause a short circuit in the MLCCs, resulting in a short circuit in the PSU connector. If the PSU is started with its connector short-circuited, the server's motherboard will burn out due to the excessive current generated during power-on. Summary of the Invention

[0003] To address the problems existing in the prior art, embodiments of the present invention provide a monitoring circuit for a power supply connector, a motherboard, and a server.

[0004] In a first aspect, the present invention provides a monitoring circuit for a power supply connector, comprising: a voltage conversion module, a voltage comparison module, a reference voltage module, a diode, and a load resistor;

[0005] The output terminal of the reference voltage module is electrically connected to the input terminal of the voltage conversion module and the first input terminal of the voltage comparison module. The output terminal of the voltage conversion module is electrically connected to the second input terminal of the voltage comparison module, the positive terminal of the diode, and the first terminal of the load resistor. The negative terminal of the diode is electrically connected to the voltage output terminal of the power supply. The second terminal of the load resistor is grounded.

[0006] The reference voltage module is used to provide a reference voltage to the voltage conversion module and the voltage comparison module, and the reference voltage is greater than the forward conduction voltage of the diode;

[0007] The voltage conversion module is used to convert the voltage of the onboard battery based on the reference voltage and output a target voltage, wherein the target voltage is greater than the reference voltage and less than the voltage of the power supply.

[0008] The voltage comparison module is used for:

[0009] Compare the magnitude of the reference voltage and the voltage at the positive terminal of the diode;

[0010] When the voltage at the positive terminal of the diode is greater than the reference voltage, a first indication voltage is output, which is used to indicate that the power supply connector is not in a short-circuit state.

[0011] Alternatively, if the voltage at the positive terminal of the diode is less than the reference voltage, a second indicating voltage is output, which is used to indicate that the power supply connector is not in a short-circuit state.

[0012] Optionally, according to the monitoring circuit of a power supply connector provided by the present invention, the voltage comparison module includes: a first operational amplifier and a first transistor, wherein the first transistor is a positive type metal-oxide-semiconductor PMOS;

[0013] The inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the reference voltage module, and the non-inverting input terminal of the first operational amplifier is electrically connected to the positive terminal of the diode.

[0014] The output terminal of the first operational amplifier is electrically connected to the gate of the first transistor, and the power supply terminal of the first operational amplifier is electrically connected to the source of the first transistor and the positive terminal of the onboard battery.

[0015] The first operational amplifier is used for:

[0016] By comparing the reference voltage with the voltage at the positive terminal of the diode, a first control voltage is output, which is used to indicate the magnitude relationship between the reference voltage and the voltage at the positive terminal of the diode.

[0017] The first transistor is used for:

[0018] When the voltage at the positive terminal of the diode indicated by the first control voltage is greater than the reference voltage, the first indication voltage is output through the drain of the first transistor, and the first indication voltage is 0V;

[0019] Alternatively, if the voltage at the positive terminal of the diode indicated by the first control voltage is less than the reference voltage, a second indication voltage is output through the drain of the first transistor, the second indication voltage being the voltage of the onboard battery.

[0020] Optionally, according to the monitoring circuit of a power supply connector provided by the present invention, the voltage comparison module includes: a first microcontroller unit (MCU) and a relay;

[0021] The first input terminal of the first microcontroller unit is electrically connected to the output terminal of the reference voltage module, and the second input terminal of the first microcontroller unit is electrically connected to the positive terminal of the diode.

[0022] The output terminal of the first microcontroller unit is electrically connected to the control terminal of the relay;

[0023] The first microcontroller unit is used for:

[0024] Based on the reference voltage and the voltage at the positive terminal of the diode, a first digital quantity corresponding to the reference voltage and a second digital quantity corresponding to the voltage at the positive terminal of the diode are determined by analog-to-digital conversion.

[0025] By comparing the first digital value and the second digital value, a second control voltage is output, which is used to indicate the magnitude relationship between the reference voltage and the voltage at the positive terminal of the diode;

[0026] The relay is used for:

[0027] When the voltage at the positive terminal of the diode indicated by the second control voltage is greater than the reference voltage, the first indicating voltage is output;

[0028] Alternatively, if the voltage at the positive terminal of the diode indicated by the second control voltage is less than the reference voltage, the second indication voltage is output.

[0029] Optionally, in a monitoring circuit for a power supply connector provided by the present invention, the relay is specifically used for:

[0030] When the voltage at the positive terminal of the diode indicated by the second control voltage is greater than the reference voltage, the ground terminal of the relay is connected to the output terminal of the relay to output the first indicating voltage, which is 0V.

[0031] Alternatively, if the voltage at the positive terminal of the diode indicated by the second control voltage is less than the reference voltage, the power supply terminal of the relay is connected to the output terminal of the relay to output the second indicating voltage, which is the voltage of the onboard battery.

[0032] Optionally, according to the monitoring circuit of a power supply connector provided by the present invention, the voltage conversion module includes: a comparison unit and a second transistor, wherein the second transistor is a positive type metal-oxide-semiconductor PMOS;

[0033] The first input terminal of the comparison unit is electrically connected to the output terminal of the reference voltage module, and the second input terminal of the comparison unit is electrically connected to the positive terminal of the diode and the drain terminal of the second transistor.

[0034] The output terminal of the comparator is electrically connected to the gate of the second transistor, and the power supply terminal of the comparator is electrically connected to the source of the second transistor and the positive terminal of the onboard battery.

[0035] The comparison unit is used for:

[0036] By comparing the reference voltage with the voltage at the positive terminal of the diode, a third control voltage is output, which is used to reduce the difference between the drain voltage of the second transistor and the target voltage.

[0037] Optionally, in a monitoring circuit for a power supply connector provided by the present invention, the comparison unit includes: a second operational amplifier, a first resistor, and a second resistor;

[0038] The inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the reference voltage module;

[0039] The output terminal of the second operational amplifier is electrically connected to the gate of the second transistor, and the power supply terminal of the second operational amplifier is electrically connected to the source of the second transistor and the positive terminal of the onboard battery.

[0040] The first end of the first resistor is electrically connected to the drain of the second transistor, the second end of the first resistor is electrically connected to the non-inverting input of the second operational amplifier and the first end of the second resistor, and the second end of the second resistor is grounded.

[0041] Optionally, in the monitoring circuit of a power supply connector provided by the present invention, the comparison unit is a second microcontroller unit.

[0042] Optionally, in a monitoring circuit for a power supply connector provided by the present invention, the reference voltage module includes: a third resistor and a fourth resistor;

[0043] The first end of the third resistor is electrically connected to the positive terminal of the onboard battery, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is grounded, and the voltage at the second end of the third resistor is equal to the reference voltage.

[0044] In a second aspect, the present invention also provides a motherboard, comprising: a power supply connector, an onboard battery, and a monitoring circuit for the power supply connector as described in any of the above.

[0045] Thirdly, the present invention also provides a server, comprising: a power supply and a motherboard as described in any of the above.

[0046] The power supply connector monitoring circuit, motherboard, and server provided by this invention, when the PSU connector is functioning normally, have a relatively high impedance. The voltage at the anode of the diode equals the target voltage, and the voltage at the cathode of the diode equals the PSU voltage. The target voltage is less than the PSU voltage, and the diode is reverse-biased and cut off. By comparing the reference voltage and the voltage at the anode of the diode using a voltage comparison module, it can be determined that the voltage at the anode of the diode is greater than the reference voltage. The voltage comparison module then outputs a first indication voltage. During PSU startup, the PSU can determine that the PSU connector is not in a short-circuit state based on this first indication voltage, indicating that the PSU is functioning normally. Startup: When the PSU connector is short-circuited, the PSU connector impedance is 0, the voltage at the negative terminal of the diode is 0, the diode is forward-conducting, and the voltage at the positive terminal of the diode is equal to the forward conduction voltage of the diode. By comparing the reference voltage and the voltage at the positive terminal of the diode through the voltage comparison module, it can be determined that the voltage at the positive terminal of the diode is less than the reference voltage. Then, the voltage comparison module outputs a second indication voltage. During the PSU startup process, the PSU can determine that the PSU connector is in a short-circuit state based on the second indication voltage. Under this condition, the PSU is prohibited from starting, which avoids the server motherboard from being burned out due to excessive current generated at the moment of power-on, thus improving safety. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0048] Figure 1 This is a structural diagram of a power supply connector provided by related technologies;

[0049] Figure 2 This is one of the structural schematic diagrams of the monitoring circuit of the power supply connector provided by the present invention;

[0050] Figure 3 This is a schematic diagram of the voltage comparison module provided by the present invention;

[0051] Figure 4 This is a schematic diagram of the voltage conversion module provided by the present invention;

[0052] Figure 5 This is the second schematic diagram of the monitoring circuit of the power supply connector provided by the present invention.

[0053] Figure label:

[0054] 10: Voltage conversion module; 11: Comparison unit; 12: Second transistor; 20: Voltage comparison module; 21: First operational amplifier; 22: First transistor; 30: Reference voltage module; 40: Diode; 50: Load resistor; 60: Power supply; 70: Power supply connector; 80: Onboard battery. Detailed Implementation

[0055] To facilitate a clearer understanding of the various embodiments of the present invention, some relevant background knowledge will be introduced as follows.

[0056] In related technologies, PSU connectors typically output an FM_PSU_PSON_N signal through a startup control pin to control PSU startup. When the FM_PSU_PSON_N signal is at a logic low level, the PSU can start normally; when the FM_PSU_PSON_N signal is at a logic high level, the PSU is disabled from starting. Figure 1 This is a structural diagram of a power supply connector provided by related technologies, such as... Figure 1 As shown, in related technologies, the startup control pin of the PSU connector is generally grounded directly through a 0-ohm resistor (this is a common design approach in server PSU connector design), without any other detection or control applications. If the PSU is started while the PSU connector is short-circuited, the server's motherboard will burn out due to the excessive current generated during power-on.

[0057] To overcome the above-mentioned defects, the present invention provides a monitoring circuit for a power supply connector, a motherboard, and a server. By monitoring the impedance of the PSU connector, the PSU is prevented from starting when the PSU connector is short-circuited, which can prevent the server's motherboard from burning out due to excessive current generated at the moment of power-on and improve safety.

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0059] Figure 2 This is one of the structural schematic diagrams of the monitoring circuit of the power supply connector provided by the present invention, such as... Figure 2 As shown, the monitoring circuit includes: a voltage conversion module 10, a voltage comparison module 20, a reference voltage module 30, a diode 40, and a load resistor 50;

[0060] The output terminal of the reference voltage module is electrically connected to the input terminal of the voltage conversion module and the first input terminal of the voltage comparison module. The output terminal of the voltage conversion module is electrically connected to the second input terminal of the voltage comparison module, the positive terminal of the diode, and the first terminal of the load resistor. The negative terminal of the diode is electrically connected to the voltage output terminal of the power supply 60. The second terminal of the load resistor is grounded.

[0061] The reference voltage module is used to provide a reference voltage to the voltage conversion module and the voltage comparison module, and the reference voltage is greater than the forward conduction voltage of the diode;

[0062] The voltage conversion module is used to convert the voltage of the onboard battery based on the reference voltage and output a target voltage, wherein the target voltage is greater than the reference voltage and less than the voltage of the power supply.

[0063] The voltage comparison module is used for:

[0064] Compare the magnitude of the reference voltage and the voltage at the positive terminal of the diode;

[0065] When the voltage at the positive terminal of the diode is greater than the reference voltage, a first indication voltage is output, which is used to indicate that the power supply connector is not in a short-circuit state.

[0066] Alternatively, if the voltage at the positive terminal of the diode is less than the reference voltage, a second indicating voltage is output, which is used to indicate that the power supply connector is not in a short-circuit state.

[0067] Specifically, such as Figure 2 As shown, when the power supply connector (PSU connector) 70 is normal, the impedance of the PSU connector is relatively large (approximately open circuit). The voltage at the positive terminal of the diode is equal to the target voltage, and the voltage at the negative terminal of the diode is equal to the voltage of the PSU. The target voltage is less than the voltage of the PSU, and the diode is reverse-biased and cut off. By comparing the reference voltage and the voltage at the positive terminal of the diode through the voltage comparison module, it can be determined that the voltage at the positive terminal of the diode is greater than the reference voltage. Then, the voltage comparison module outputs the first indication voltage. During the PSU startup process, the PSU can determine that the PSU connector is not in a short-circuit state based on the first indication voltage. Under this condition, the PSU starts normally.

[0068] When the PSU connector is short-circuited, the PSU connector impedance is 0, the voltage at the negative terminal of the diode is 0, the diode is forward-conducting, and the voltage at the positive terminal of the diode is equal to the forward conduction voltage of the diode. By comparing the reference voltage and the voltage at the positive terminal of the diode through the voltage comparison module, it can be determined that the voltage at the positive terminal of the diode is less than the reference voltage. Then, the voltage comparison module outputs a second indication voltage. During the PSU startup process, the PSU can determine that the PSU connector is in a short-circuit state based on the second indication voltage. Under this condition, the PSU is prohibited from starting, which prevents the server motherboard from burning out due to excessive current generated at the moment of power-on, thus improving safety.

[0069] The output of the voltage comparator module can be used as a start-up control pin to control the PSU startup. For example, when the PSU connector is functioning normally, the voltage comparator module outputs a first indication voltage through the start-up control pin. The PSU can determine based on this first indication voltage that the PSU connector is not short-circuited, and in this case, the PSU starts normally. Conversely, when the PSU connector is short-circuited, the voltage comparator module outputs a second indication voltage through the start-up control pin. The PSU can determine based on this second indication voltage that the PSU connector is short-circuited, and in this case, the PSU startup is disabled.

[0070] It is understandable that the monitoring circuitry of the power supply connector can be powered by the onboard battery on the server's motherboard. For example, the components in the monitoring circuitry can be powered by the onboard battery on the server's motherboard, which has a power supply voltage of 3V.

[0071] Optionally, when using an onboard battery with a supply voltage of 3V to power the components in the monitoring circuit, the forward conduction voltage of the diode is 0.7V, the reference voltage can be designed to be 1V, and the target voltage can be designed to be 2V.

[0072] Optionally, according to the monitoring circuit of a power supply connector provided by the present invention, the voltage comparison module includes: a first operational amplifier and a first transistor, wherein the first transistor is a positive type metal-oxide-semiconductor PMOS;

[0073] The inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the reference voltage module, and the non-inverting input terminal of the first operational amplifier is electrically connected to the positive terminal of the diode.

[0074] The output terminal of the first operational amplifier is electrically connected to the gate of the first transistor, and the power supply terminal of the first operational amplifier is electrically connected to the source of the first transistor and the positive terminal of the onboard battery.

[0075] The first operational amplifier is used for:

[0076] By comparing the reference voltage with the voltage at the positive terminal of the diode, a first control voltage is output, which is used to indicate the magnitude relationship between the reference voltage and the voltage at the positive terminal of the diode.

[0077] The first transistor is used for:

[0078] When the voltage at the positive terminal of the diode indicated by the first control voltage is greater than the reference voltage, the first indication voltage is output through the drain of the first transistor, and the first indication voltage is 0V;

[0079] Alternatively, if the voltage at the positive terminal of the diode indicated by the first control voltage is less than the reference voltage, a second indication voltage is output through the drain of the first transistor, the second indication voltage being the voltage of the onboard battery.

[0080] Specifically, Figure 3 This is a schematic diagram of the voltage comparison module provided by the present invention, as shown below. Figure 3 As shown, the voltage comparison module 20 includes: a first operational amplifier 21 and a first transistor 22. The first transistor is a positive-type metal-oxide-semiconductor field-effect transistor (PMOS). The inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the reference voltage module, and the non-inverting input terminal of the first operational amplifier is electrically connected to the positive terminal of the diode. The output terminal of the first operational amplifier is electrically connected to the gate of the first transistor, and the power supply terminal of the first operational amplifier is electrically connected to the source of the first transistor and the positive terminal of the onboard battery 80.

[0081] When the PSU connector is functioning normally, its impedance is relatively high. The voltage at the positive terminal of the diode equals the target voltage, and the voltage at the negative terminal of the diode equals the PSU voltage. Since the target voltage is less than the PSU voltage, the diode is reverse-biased and cut off. By comparing the reference voltage with the voltage at the positive terminal of the diode using the first operational amplifier, it can be determined that the voltage at the positive terminal of the diode is greater than the reference voltage. Consequently, the first operational amplifier controls the first transistor to output a first indicator voltage, which is 0V. During PSU startup, the PSU can determine that the PSU connector is not in a short-circuit state based on the first indicator voltage, and under these conditions, the PSU starts normally.

[0082] When the PSU connector is short-circuited, the PSU connector impedance is 0, the voltage at the negative terminal of the diode is 0, the diode is forward-conducting, and the voltage at the positive terminal of the diode is equal to the forward conduction voltage of the diode. By comparing the reference voltage and the voltage at the positive terminal of the diode with the voltage at the first operational amplifier, it can be determined that the voltage at the positive terminal of the diode is less than the reference voltage. Then, the first operational amplifier controls the first transistor to output a second indicator voltage, which is the voltage of the onboard battery. During the PSU startup process, the PSU can determine that the PSU connector is in a short-circuit state based on the second indicator voltage. Under this condition, the PSU is prohibited from starting to avoid the server motherboard being burned out due to excessive current generated at the moment of power-on.

[0083] Optionally, according to the monitoring circuit of a power supply connector provided by the present invention, the voltage comparison module includes: a first microcontroller unit (MCU) and a relay;

[0084] The first input terminal of the first microcontroller unit is electrically connected to the output terminal of the reference voltage module, and the second input terminal of the first microcontroller unit is electrically connected to the positive terminal of the diode.

[0085] The output terminal of the first microcontroller unit is electrically connected to the control terminal of the relay;

[0086] The first microcontroller unit is used for:

[0087] Based on the reference voltage and the voltage at the positive terminal of the diode, a first digital quantity corresponding to the reference voltage and a second digital quantity corresponding to the voltage at the positive terminal of the diode are determined by analog-to-digital conversion.

[0088] By comparing the first digital value and the second digital value, a second control voltage is output, which is used to indicate the magnitude relationship between the reference voltage and the voltage at the positive terminal of the diode;

[0089] The relay is used for:

[0090] When the voltage at the positive terminal of the diode indicated by the second control voltage is greater than the reference voltage, the first indicating voltage is output;

[0091] Alternatively, if the voltage at the positive terminal of the diode indicated by the second control voltage is less than the reference voltage, the second indication voltage is output.

[0092] Specifically, when the PSU connector is functioning normally, the PSU connector has a relatively high impedance. The voltage at the positive terminal of the diode is equal to the target voltage, and the voltage at the negative terminal of the diode is equal to the voltage of the PSU. The target voltage is less than the voltage of the PSU, and the diode is reverse-biased and cut off. By comparing the reference voltage with the voltage at the positive terminal of the diode through the first microcontroller unit (MCU), it can be determined that the voltage at the positive terminal of the diode is greater than the reference voltage. Then, the first microcontroller unit controls the relay to output the first indication voltage. During the PSU startup process, the PSU can determine that the PSU connector is not in a short-circuit state based on the first indication voltage, and the PSU starts normally under this condition.

[0093] When the PSU connector is short-circuited, the PSU connector impedance is 0, the voltage at the negative terminal of the diode is 0, the diode is forward-conducting, and the voltage at the positive terminal of the diode is equal to the forward conduction voltage of the diode. By comparing the reference voltage and the voltage at the positive terminal of the diode with the voltage at the first microcontroller unit, it can be determined that the voltage at the positive terminal of the diode is less than the reference voltage. Then, the first microcontroller unit controls the relay to output a second indication voltage, which is the voltage of the onboard battery. During the PSU startup process, the PSU can determine that the PSU connector is in a short-circuit state based on the second indication voltage. Under this condition, the PSU is prohibited from starting to avoid the server motherboard being burned out due to excessive current generated at the moment of power-on.

[0094] Optionally, in a monitoring circuit for a power supply connector provided by the present invention, the relay is specifically used for:

[0095] When the voltage at the positive terminal of the diode indicated by the second control voltage is greater than the reference voltage, the ground terminal of the relay is connected to the output terminal of the relay to output the first indicating voltage, which is 0V.

[0096] Alternatively, if the voltage at the positive terminal of the diode indicated by the second control voltage is less than the reference voltage, the power supply terminal of the relay is connected to the output terminal of the relay to output the second indicating voltage, which is the voltage of the onboard battery.

[0097] Understandably, when the PSU connector is functioning normally, the first microcontroller unit controls the relay to connect the relay's ground terminal to its output terminal, and the relay outputs a first indicating voltage, which is 0V, allowing the PSU to start normally. When the PSU connector is short-circuited, the first microcontroller unit controls the relay to connect the relay's power supply terminal to its output terminal, and the relay outputs a second indicating voltage, which is the voltage of the onboard battery, preventing the PSU from starting.

[0098] For example, when the onboard battery with a supply voltage of 3V is used to power the components in the monitoring circuit, if the PSU connector is short-circuited, the first microcontroller unit controls the relay to operate, connecting the power supply terminal of the relay to the output terminal of the relay, and the relay outputs a second indicating voltage, which is 3V.

[0099] Optionally, according to the monitoring circuit of a power supply connector provided by the present invention, the voltage conversion module includes: a comparison unit and a second transistor, wherein the second transistor is a positive type metal-oxide-semiconductor PMOS;

[0100] The first input terminal of the comparison unit is electrically connected to the output terminal of the reference voltage module, and the second input terminal of the comparison unit is electrically connected to the positive terminal of the diode and the drain terminal of the second transistor.

[0101] The output terminal of the comparator is electrically connected to the gate of the second transistor, and the power supply terminal of the comparator is electrically connected to the source of the second transistor and the positive terminal of the onboard battery.

[0102] The comparison unit is used for:

[0103] By comparing the reference voltage with the voltage at the positive terminal of the diode, a third control voltage is output, which is used to reduce the difference between the drain voltage of the second transistor and the target voltage.

[0104] Specifically, Figure 4 This is a schematic diagram of the voltage conversion module provided by the present invention, as shown below. Figure 4 As shown, the voltage conversion module 10 includes: a comparator unit 11 and a second transistor 12, the second transistor being a positive type metal-oxide-semiconductor (PMOS); the first input terminal of the comparator unit is electrically connected to the output terminal of the reference voltage module, the second input terminal of the comparator unit is electrically connected to the anode of the diode and the drain of the second transistor; the output terminal of the comparator unit is electrically connected to the gate of the second transistor, and the power supply terminal of the comparator unit is electrically connected to the source of the second transistor and the positive terminal of the onboard battery.

[0105] To achieve a drain voltage of the second transistor equal to the target voltage, where the target voltage is greater than the reference voltage and less than the power supply voltage, the first input terminal of the comparator unit acquires the reference voltage, and the second input terminal of the comparator unit acquires the voltage at the positive terminal of the diode. The comparator unit then compares the reference voltage with the voltage at the positive terminal of the diode, generates a third control voltage, and outputs it to the gate of the second transistor. This adjusts the drain voltage of the second transistor, narrowing the gap between the drain voltage of the second transistor and the target voltage until the drain voltage of the second transistor equals the target voltage. In other words, when the PSU connector is functioning normally, the voltage at the positive terminal of the diode equals the target voltage.

[0106] Optionally, in a monitoring circuit for a power supply connector provided by the present invention, the comparison unit includes: a second operational amplifier, a first resistor, and a second resistor;

[0107] The inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the reference voltage module;

[0108] The output terminal of the second operational amplifier is electrically connected to the gate of the second transistor, and the power supply terminal of the second operational amplifier is electrically connected to the source of the second transistor and the positive terminal of the onboard battery.

[0109] The first end of the first resistor is electrically connected to the drain of the second transistor, the second end of the first resistor is electrically connected to the non-inverting input of the second operational amplifier and the first end of the second resistor, and the second end of the second resistor is grounded.

[0110] Specifically, Figure 5 This is a second schematic diagram of the monitoring circuit of the power supply connector provided by the present invention, as shown below. Figure 5 As shown, this is a PMOS control architecture. To adjust the required output voltage, the second operational amplifier (i.e., Figure 5 The feedback loop of EA1 will control the second transistor (i.e., Figure 5 The drain-source resistance R of Q1) DS The onboard battery on the server's motherboard can be used as the input voltage source. EA1 is connected through the first resistor (i.e., Figure 5 R1) and the second resistor (i.e. Figure 5 The voltage across the positive terminal of the diode (i.e., R2) Figure 5 China V OUT Monitor the voltage of the battery on the motherboard and V. OUT As the gap between EA1 and EA2 decreases, EA1 will drive the gate-source voltage V. GS Increase negatively to reduce the drain-source resistance R. DS From maintaining voltage regulation, the stabilized voltage V OUTThis is the target voltage mentioned above.

[0111] in, Figure 5 R1 is the first resistor. Figure 5 R2 is the second resistor, V OUT =V REF ×(1+R1 / R2), V REF Indicates the reference voltage.

[0112] Optionally, in the monitoring circuit of a power supply connector provided by the present invention, the comparison unit is a second microcontroller unit.

[0113] Specifically, the first input terminal of the second microcontroller unit (e.g., MCU) acquires a reference voltage, and the second input terminal of the second microcontroller unit acquires the voltage at the positive terminal of the diode. Then, the second microcontroller unit can compare the reference voltage and the voltage at the positive terminal of the diode, generate a third control voltage and output it to the gate of the second transistor, adjust the drain voltage of the second transistor, reduce the difference between the drain voltage of the second transistor and the target voltage, until the drain voltage of the second transistor is equal to the target voltage.

[0114] Optionally, in a monitoring circuit for a power supply connector provided by the present invention, the reference voltage module includes: a third resistor and a fourth resistor;

[0115] The first end of the third resistor is electrically connected to the positive terminal of the onboard battery, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is grounded, and the voltage at the second end of the third resistor is equal to the reference voltage.

[0116] Specifically, such as Figure 5 As shown, the reference voltage module 30 includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor is electrically connected to the positive terminal of the onboard battery, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is grounded, and the voltage at the second end of the third resistor is equal to the reference voltage.

[0117] It is understandable that by properly designing the resistance ratio between the third and fourth resistors, and dividing the voltage provided by the onboard battery using the third and fourth resistors, the aforementioned reference voltage can be obtained.

[0118] Optionally, such as Figure 5 As shown, its working principle will be analyzed below:

[0119] (1) When the PSU connector is functioning normally, it typically has a certain impedance. At this time, the connector is approximately open-circuited, and its load is only the load resistance (e.g., ...). Figure 5 Chinese R load ), through V OUT=V REF ×(1+R1 / R2), V is determined via EA1. OUT The size, in turn, drives Q1 to generate 2V.

[0120] (2) Via the first operational amplifier (i.e. Figure 5 EA2 in the middle) detected V OUT When = 2V, with V REF =1V is compared, and after EA2 makes a judgment, a low voltage state is provided to FM_PSU_PSON_N to allow the PSU to start normally and provide power to the server motherboard.

[0121] (3) When the voltage output terminal of the PSU (i.e. Figure 5 PSU_V in OUT When a normal 12V supply is provided, the high voltage is blocked by diode D1, which can prevent the reverse bias voltage from going directly back to the battery terminal of the motherboard.

[0122] (4) When a short circuit occurs in the PSU connector, the impedance is 0 ohms. At this time, the connector is in a short circuit state. OUT =0.7V (only the diode forward voltage remains).

[0123] (5) When 0.7V is detected by EA2, the voltage is measured by EA2 and V. REF =1V is used for comparison to determine the voltage level. After that, the voltage is passed through the first transistor (i.e. Figure 5 Q2) provides a 3V high voltage state to FM_PSU_PSON_N, which prevents the PSU from starting up by using the 3V high potential, thereby avoiding the server's motherboard from burning out due to excessive current generated during power-on.

[0124] The power supply connector monitoring circuit provided by this invention, under normal PSU connector conditions, has a relatively high impedance. The voltage at the anode of the diode equals the target voltage, and the voltage at the cathode of the diode equals the PSU voltage. Since the target voltage is less than the PSU voltage, the diode is reverse-biased and cut off. By comparing the reference voltage and the voltage at the anode of the diode using a voltage comparison module, it can be determined that the voltage at the anode of the diode is greater than the reference voltage. Therefore, the voltage comparison module outputs a first indication voltage. During PSU startup, the PSU can determine that the PSU connector is not in a short-circuit state based on the first indication voltage, and under this condition, the PSU starts normally. When the PSU connector is short-circuited, the PSU connector impedance is 0, the voltage at the negative terminal of the diode is 0, the diode is forward-conducting, and the voltage at the positive terminal of the diode is equal to the forward conduction voltage of the diode. By comparing the reference voltage and the voltage at the positive terminal of the diode through the voltage comparison module, it can be determined that the voltage at the positive terminal of the diode is less than the reference voltage. Then, the voltage comparison module outputs a second indication voltage. During the PSU startup process, the PSU can determine that the PSU connector is in a short-circuit state based on the second indication voltage. Under this condition, the PSU is prohibited from starting, which prevents the server motherboard from burning out due to excessive current generated at the moment of power-on, thus improving safety.

[0125] The present invention also provides a motherboard, the motherboard comprising: a power supply connector, an onboard battery, and a monitoring circuit for the power supply connector as described in any of the above.

[0126] Alternatively, the motherboard can be either the server's motherboard or a GPU board.

[0127] For example, the motherboard of a server may include a power supply connector, an onboard battery, and monitoring circuitry as described above.

[0128] For example, a GPU board may include a power supply connector, an onboard battery, and monitoring circuitry as described above.

[0129] The present invention also provides a server comprising: a power supply and a motherboard as described in any of the above.

[0130] Specifically, the server may include the aforementioned motherboard and one or more power supplies, which can be plugged into the motherboard via a power supply connector.

[0131] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0132] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A monitoring circuit for a power supply connector, characterized in that, include: Voltage conversion module, voltage comparison module, reference voltage module, diodes and load resistors; The output terminal of the reference voltage module is electrically connected to the input terminal of the voltage conversion module and the first input terminal of the voltage comparison module. The output terminal of the voltage conversion module is electrically connected to the second input terminal of the voltage comparison module, the positive terminal of the diode, and the first terminal of the load resistor. The negative terminal of the diode is electrically connected to the voltage output terminal of the power supply. The second terminal of the load resistor is grounded. The reference voltage module is used to provide a reference voltage to the voltage conversion module and the voltage comparison module, and the reference voltage is greater than the forward conduction voltage of the diode; The voltage conversion module is used to convert the voltage of the onboard battery based on the reference voltage and output a target voltage, wherein the target voltage is greater than the reference voltage and less than the voltage of the power supply. The voltage comparison module is used for: Compare the magnitude of the reference voltage and the voltage at the positive terminal of the diode; When the voltage at the positive terminal of the diode is greater than the reference voltage, a first indication voltage is output, which is used to indicate that the power supply connector is not in a short-circuit state. Alternatively, if the voltage at the positive terminal of the diode is less than the reference voltage, a second indicating voltage is output, which is used to indicate that the power supply connector is in a short-circuit state.

2. The monitoring circuit for the power supply connector according to claim 1, characterized in that, The voltage comparison module includes: a first operational amplifier and a first transistor, wherein the first transistor is a positive type metal-oxide-semiconductor PMOS. The inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the reference voltage module, and the non-inverting input terminal of the first operational amplifier is electrically connected to the positive terminal of the diode. The output terminal of the first operational amplifier is electrically connected to the gate of the first transistor, and the power supply terminal of the first operational amplifier is electrically connected to the source of the first transistor and the positive terminal of the onboard battery. The first operational amplifier is used for: By comparing the reference voltage with the voltage at the positive terminal of the diode, a first control voltage is output, which is used to indicate the magnitude relationship between the reference voltage and the voltage at the positive terminal of the diode. The first transistor is used for: When the voltage at the positive terminal of the diode indicated by the first control voltage is greater than the reference voltage, the first indication voltage is output through the drain of the first transistor, and the first indication voltage is 0V; Alternatively, if the voltage at the positive terminal of the diode indicated by the first control voltage is less than the reference voltage, a second indication voltage is output through the drain of the first transistor, the second indication voltage being the voltage of the onboard battery.

3. The monitoring circuit for the power supply connector according to claim 1, characterized in that, The voltage comparison module includes: a first microcontroller unit (MCU) and a relay; The first input terminal of the first microcontroller unit is electrically connected to the output terminal of the reference voltage module, and the second input terminal of the first microcontroller unit is electrically connected to the positive terminal of the diode. The output terminal of the first microcontroller unit is electrically connected to the control terminal of the relay; The first microcontroller unit is used for: Based on the reference voltage and the voltage at the positive terminal of the diode, a first digital quantity corresponding to the reference voltage and a second digital quantity corresponding to the voltage at the positive terminal of the diode are determined by analog-to-digital conversion. By comparing the first digital value and the second digital value, a second control voltage is output, which is used to indicate the magnitude relationship between the reference voltage and the voltage at the positive terminal of the diode; The relay is used for: When the voltage at the positive terminal of the diode indicated by the second control voltage is greater than the reference voltage, the first indicating voltage is output; Alternatively, if the voltage at the positive terminal of the diode indicated by the second control voltage is less than the reference voltage, the second indication voltage is output.

4. The monitoring circuit for the power supply connector according to claim 3, characterized in that, The relay is specifically used for: When the voltage at the positive terminal of the diode indicated by the second control voltage is greater than the reference voltage, the ground terminal of the relay is connected to the output terminal of the relay to output the first indicating voltage, which is 0V. Alternatively, if the voltage at the positive terminal of the diode indicated by the second control voltage is less than the reference voltage, the power supply terminal of the relay is connected to the output terminal of the relay to output the second indicating voltage, which is the voltage of the onboard battery.

5. The monitoring circuit for the power supply connector according to any one of claims 1-4, characterized in that, The voltage conversion module includes: a comparator unit and a second transistor, wherein the second transistor is a positive type metal-oxide-semiconductor PMOS. The first input terminal of the comparison unit is electrically connected to the output terminal of the reference voltage module, and the second input terminal of the comparison unit is electrically connected to the positive terminal of the diode and the drain of the second transistor. The output terminal of the comparator is electrically connected to the gate of the second transistor, and the power supply terminal of the comparator is electrically connected to the source of the second transistor and the positive terminal of the onboard battery. The comparison unit is used for: By comparing the reference voltage with the voltage at the positive terminal of the diode, a third control voltage is output, which is used to reduce the difference between the drain voltage of the second transistor and the target voltage.

6. The monitoring circuit of the power supply connector according to claim 5, characterized in that, The comparison unit includes: a second operational amplifier, a first resistor, and a second resistor; The inverting input terminal of the second operational amplifier is electrically connected to the output terminal of the reference voltage module; The output terminal of the second operational amplifier is electrically connected to the gate of the second transistor, and the power supply terminal of the second operational amplifier is electrically connected to the source of the second transistor and the positive terminal of the onboard battery. The first end of the first resistor is electrically connected to the drain of the second transistor, the second end of the first resistor is electrically connected to the non-inverting input of the second operational amplifier and the first end of the second resistor, and the second end of the second resistor is grounded.

7. The monitoring circuit for the power supply connector according to claim 5, characterized in that, The comparison unit is a second microcontroller unit.

8. The monitoring circuit for the power supply connector according to any one of claims 1-4, characterized in that, The reference voltage module includes: a third resistor and a fourth resistor; The first end of the third resistor is electrically connected to the positive terminal of the onboard battery, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is grounded, and the voltage at the second end of the third resistor is equal to the reference voltage.

9. A motherboard, characterized in that, include: A power supply connector, an onboard battery, and a monitoring circuit for the power supply connector as described in any one of claims 1-8.

10. A server, characterized in that, include: Power supply and motherboard as described in claim 9.

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