Power supply protection circuit, switching power supply circuit and server

Abstract

The present invention provides a power supply protection circuit, a switching power supply circuit and a server. The power supply protection circuit includes: a voltage regulation chip; a first triode, the base of the first triode is connected to a first connection point between a first enable pin and a second enable pin of the voltage regulation chip, the collector of the first triode is connected to the load voltage output pin of the voltage regulation chip; the emitter of the first triode is grounded through a first voltage dividing resistor; a second triode, a second voltage dividing resistor is connected in series between the base of the second triode and the first voltage dividing resistor, the second voltage dividing resistor is used to be connected in series with a third voltage dividing resistor and then connected to a preset voltage, the collector of the second triode is connected to the base of the first triode, and the emitter of the second triode is grounded. Through the present invention, the power supply stability of the power supply circuit can be improved, the safety of the backend load can be guaranteed, so as to achieve the purpose of effectively avoiding the occurrence of board burning.

Description

Technical Field

[0001] The present invention relates to the field of power control, and particularly to a power supply protection circuit, a switching power supply circuit and a server. Background Art

[0002] The power supply requirements of the main board and other boards in a server are low voltage and large current. Therefore, a buck switching power supply circuit is generally used for power supply in a server.

[0003] In the related art, in the power supply scheme of the buck switching power supply circuit, the on-off state of the internal logic circuit of the voltage regulator (VR) chip in the power supply circuit is mainly used to control the power supply state of the power supply circuit, so that when the power supply circuit is overloaded, the power supply can be stopped to protect the rear-end load.

[0004] However, when using this method to control the power supply state of the power supply circuit, if the rear-end load is short-circuited, it will cause an excessive instantaneous current in the VR chip, and the internal logic circuit cannot protect the rear-end load in time, thus leading to a board burning problem. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the instantaneous current is too large, the protection of the rear-end load is not timely, and it will cause board burning, so as to provide a power supply protection circuit, a switching power supply circuit and a server.

[0006] According to a first aspect, an embodiment of the present invention provides a power supply protection circuit, and the power supply protection circuit includes:

[0007] A voltage regulator chip, including a first enable pin and a load voltage output pin, the first enable pin is connected to the second enable pin of a logic control device, the first enable pin is used to receive an enable signal sent by the logic control device through the second enable pin, and the load voltage output pin is used to output a load voltage to a load;

[0008] A first triode, the base of the first triode is connected to a first connection point between the first enable pin and the second enable pin, the collector of the first triode is connected to the load voltage output pin; the emitter of the first triode is grounded through a first voltage-dividing resistor;

[0009] A second triode, a second voltage-dividing resistor is connected in series between the base of the second triode and the first voltage-dividing resistor, the second voltage-dividing resistor is used to be connected in series with a third voltage-dividing resistor and then connected to a preset voltage, the collector of the second triode is connected to the base of the first triode, and the emitter of the second triode is grounded.

[0010] In this manner, the enable signal flowing into the voltage adjustment chip can be controlled in a targeted manner based on the working states of the first transistor and the second transistor. When the internal current of the voltage adjustment chip is too high, the on-off state of the internal logic circuit of the voltage adjustment chip can be adjusted in time by changing the level state of the enable signal, so as to improve the power supply stability of the power supply circuit and ensure the safety of the back-end load, thereby achieving the purpose of effectively avoiding the occurrence of board burn-out.

[0011] In combination with the first aspect, in a first embodiment of the first aspect, the first resistance value of the first voltage-dividing resistor is smaller than the second resistance value of the second voltage-dividing resistor, and the second resistance value of the second voltage-dividing resistor is smaller than the third resistance value of the third voltage-dividing resistor.

[0012] In combination with the first aspect or the first embodiment of the first aspect, in a second embodiment of the first aspect, further comprising:

[0013] a fourth voltage-dividing resistor, arranged between the first connection point and the collector of the second transistor;

[0014] A fifth voltage-dividing resistor, wherein a first end of the fifth voltage-dividing resistor is connected to the base of the first transistor, and a second end of the fifth voltage-dividing resistor is grounded.

[0015] In combination with the second embodiment of the first aspect, in a third embodiment of the first aspect, the logic control device is a complex programmable logic device.

[0016] In combination with the first aspect or the first embodiment of the first aspect, in a fourth embodiment of the first aspect, further comprising:

[0017] Temperature sensor;

[0018] A voltage-dividing branch comprises a sixth voltage-dividing resistor and a seventh voltage-dividing resistor, wherein a first end of the sixth voltage-dividing resistor is used to connect to a target voltage, and the target voltage is used to characterize a temperature state detected by the temperature sensor, a second end of the sixth voltage-dividing resistor is connected to a first end of the seventh voltage-dividing resistor, and a second end of the seventh voltage-dividing resistor is grounded;

[0019] A third transistor, wherein the base of the third transistor is connected to a fifth connection point between the second end of the sixth voltage-dividing resistor and the first end of the seventh voltage-dividing resistor, the collector of the third transistor is connected to the first enable pin, and the emitter of the third transistor is grounded.

[0020] In combination with the fourth embodiment of the first aspect, in a fifth embodiment of the first aspect, further comprising:

[0021] An AND gate circuit, the first input terminal of the AND gate circuit is used to receive the input voltage output by the power supply circuit, the second input terminal of the AND gate circuit is connected to the signal output terminal of the temperature sensor, and the signal output terminal is used to output the target voltage; the output terminal of the AND gate circuit is connected to the first end of the sixth voltage dividing resistor.

[0022] Combined with the fifth embodiment of the first aspect, in the sixth embodiment of the first aspect, it further includes:

[0023] A first filter capacitor, the first filter capacitor is connected in parallel with the seventh voltage dividing resistor.

[0024] Combined with the first aspect, in the seventh embodiment of the first aspect, the voltage regulation chip further includes:

[0025] A power supply voltage pin for receiving the power supply voltage;

[0026] A power supply detection pin, connected to the load voltage output pin;

[0027] A voltage input pin for accessing the input voltage;

[0028] An overcurrent protection pin, grounded through an overcurrent protection resistor;

[0029] A voltage compensation pin, grounded through a second filter capacitor;

[0030] A feedback pin, grounded through an eighth voltage dividing resistor, and the eighth voltage dividing resistor is used to be connected in series with a ninth voltage dividing resistor and then access the load voltage;

[0031] A ground pin, grounded.

[0032] According to the second aspect, an embodiment of the present invention further provides a switching power supply circuit, including the power supply protection circuit according to any one of the first aspect and its optional embodiments.

[0033] According to the third aspect, an embodiment of the present invention further provides a server, including the switching power supply circuit according to the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic structural diagram of a power supply protection circuit proposed according to an exemplary embodiment.

[0036] Figure 2 It is a schematic structural diagram of another power supply protection circuit proposed according to an exemplary embodiment.

[0037] Figure 3 It is a schematic structural diagram of yet another power supply protection circuit proposed according to an exemplary embodiment.

[0038] Figure 4 It is a schematic structural diagram of yet another power supply protection circuit proposed according to an exemplary embodiment.

[0039] Figure 5 It is a schematic structural diagram of yet another power supply protection circuit proposed according to an exemplary embodiment. Detailed implementation manners

[0040] Next, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] In the related art, in the power supply scheme of a buck switching power supply circuit, the power supply state of the power supply circuit is mainly controlled by the on-off state of the internal logic circuit of the VR chip in the power supply circuit. For example: when the internal logic circuit of the VR chip is in the on state, the power supply circuit can be controlled to be in the power supply state. When the internal logic circuit of the VR chip is in the off state, the power supply circuit can be controlled to be in the power-off state. Furthermore, when the power supply circuit is overloaded, the power supply circuit can be controlled to stop power supply through the internal logic circuit of the VR chip, so as to achieve the purpose of protecting the rear-end load.

[0042] However, when using this method to control the power supply state of the power supply circuit, if the rear-end load is short-circuited, it will cause an excessive instantaneous current in the VR chip, and the internal logic circuit cannot protect the rear-end load in time, thereby causing a problem of board burning.

[0043] To solve the above problems, an embodiment of the present invention provides a power supply protection circuit. In the power supply protection circuit provided by the present invention, it includes: a voltage regulation chip, which includes a first enable pin and a load voltage output pin. The first enable pin is connected to the second enable pin of the logic control device. The first enable pin is used to receive the enable signal sent by the logic control device through the second enable pin. The load voltage output pin is used to output the load voltage to the load; a first triode, the base of the first triode is connected to the first connection point between the first enable pin and the second enable pin, the collector of the first triode is connected to the load voltage output pin; the emitter of the first triode is grounded through a first voltage dividing resistor; a second triode, a second voltage dividing resistor is connected in series between the base of the second triode and the first voltage dividing resistor. The second voltage dividing resistor is used to be connected in series with a third voltage dividing resistor and then connected to a preset voltage. The collector of the second triode is connected to the base of the first triode, and the emitter of the second triode is grounded. Through the power supply protection circuit provided by the present invention, it is possible to timely adjust the level state of the enable signal connected to the first enable pin based on the working states of the first triode and the second triode, so as to achieve the purpose of avoiding the occurrence of board burning.

[0044] Figure 1 is a schematic structural diagram of a power supply protection circuit proposed according to an exemplary embodiment. As Figure 1 shown, the power supply protection circuit includes a voltage regulation chip 10, a first triode Q1, and a second triode Q2.

[0045] The voltage regulation chip 10 includes a first enable pin EN and a load voltage output pin VOUT. The first enable pin is connected to the second enable pin of the logic control device. The first enable pin EN is used to receive the enable signal sent by the logic control device through the second enable pin. The load voltage output pin VOUT is used to output the load voltage to the load.

[0046] In an embodiment of the present invention, the internal logic circuit of the voltage regulator (VR) chip 10 controls its own on / off state according to the enable signal received by the first enable pin EN. Among them, the enable signal received by the first enable pin EN is sent through the second enable pin of the logic control device. That is, whether the internal logic circuit of the voltage regulator chip 10 is in the conducting state depends on the enable signal sent by the logic control device. For example: if the received enable signal is a specified level signal (for example: high level signal), the internal logic circuit of the voltage regulator chip 10 is in the conducting state, and then the power supply circuit can be normally powered, and the load voltage can be output to the load through the load voltage output pin VOUT, so that the backend load can work normally. If the received enable signal is a non-specified level signal, the internal logic circuit of the voltage regulator chip 10 is in the off state, and then the power supply circuit is controlled to stop power supply. The load voltage output pin VOUT is used to output the load voltage to the load when the voltage regulator chip receives the enable signal.

[0047] In one embodiment, the logic control device can be a Complex Programmable Logic Device (CPLD) deployed in the power supply circuit. In another embodiment, the logic control device can also be a Baseboard Management Controller (BMC) deployed in the server.

[0048] The first triode Q1, the base of the first triode Q1 is connected to the first connection point A between the first enable pin EN and the second enable pin, the collector of the first triode Q1 is connected to the load voltage output pin VOUT; the emitter of the first triode Q1 is grounded through the first voltage dividing resistor R1.

[0049] In an embodiment of the present invention, the first triode Q1 can be understood as a switch for monitoring whether the voltage regulator chip 10 is in the conducting state. If the internal logic circuit of the voltage regulator chip 10 is in the conducting state, the base voltage of the first triode Q1 will be pulled high, so that the first triode Q1 is in the conducting state, and the load voltage output by the load voltage output pin VOUT can flow from the collector of the first triode Q1 to the emitter of the first triode Q1, and then flow to the ground through the first voltage dividing resistor R1. If the internal logic circuit of the voltage regulator chip 10 is in the off state, the first triode Q1 does not work.

[0050] The second triode Q2, a second voltage dividing resistor R2 is connected in series between the base of the second triode Q2 and the first voltage dividing resistor R1. The second voltage dividing resistor R2 is used to be connected in series with the third voltage dividing resistor R3 and then connected to a preset voltage. The collector of the second triode Q2 is connected to the base of the first triode Q1, and the emitter of the second triode Q2 is grounded.

[0051] In an embodiment of the present invention, the second triode Q2 can be understood as a switch for monitoring whether the internal current of the voltage regulation chip 10 is greater than a specified current threshold. The working state of the first triode Q1 can be used to determine whether the internal logic circuit of the voltage regulation chip 10 is in a conducting state. When the internal logic circuit of the voltage regulation chip 10 is in a conducting state, the internal current flowing through the voltage regulation chip 10 can be further monitored by the second triode Q2, so that when the internal current of the voltage regulation chip 10 is greater than the specified current threshold, the second triode Q2 can change the level state of the enable signal to be received by the first enable pin EN, and then timely control the internal logic circuit of the voltage regulation chip 10 to be in an off state, stop the power supply circuit from continuing to supply power, and timely protect the backend load, thereby effectively avoiding the occurrence of the situation of burning the board.

[0052] In an example, the first resistance value of the first voltage-dividing resistor is less than the second resistance value of the second voltage-dividing resistor, and the second resistance value of the second voltage-dividing resistor is less than the third resistance value of the third voltage-dividing resistor. In an example, in order to enable the second triode Q2 to effectively ensure the safety of the backend load and avoid interfering with the normal power supply state of the power supply circuit, the first resistance value of the first voltage-dividing resistor R1, the second resistance value of the second voltage-dividing resistor R2, and the third resistance value of the third voltage-dividing resistor R3 can be determined based on the base threshold voltage of the second triode. By configuring the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, and the third voltage-dividing resistor R3 in this way, it can be ensured that when the internal current of the voltage regulation chip 10 is in a normal state, the second triode Q2 can be in an off state, thereby avoiding affecting the normal power supply of the power supply circuit. When the internal current of the voltage regulation chip 10 is in an excessive state, the second triode Q2 can be in a conducting state, and then the level state of the enable signal can be timely adjusted, so as to timely control the internal logic circuit of the voltage regulation chip 10 to be in an off state, thereby avoiding the occurrence of the situation of burning the board and effectively protecting the backend load. In an implementation scenario, if the base threshold voltage of the second triode Q2 is 0.7 volts (V) and the preset voltage connected is 3.3V, a 0.1 ohm (Ω) resistor can be selected as the first voltage-dividing resistor R1, a 100Ω resistor can be selected as the second voltage-dividing resistor R2, and a 1000 (1k)Ω resistor can be selected as the third voltage-dividing resistor R3.

[0053] Through the above embodiments, it is possible to perform targeted control on the enable signal flowing into the voltage regulation chip based on the working states of the first triode and the second triode, so that when the current inside the voltage regulation chip 10 is too high, the level state of the enable signal can be changed to timely adjust the on-off state of the internal logic circuit of the voltage regulation chip, improve the power supply stability of the power supply circuit, ensure the safety of the backend load, and thus achieve the purpose of effectively avoiding the occurrence of the situation of burning the board.

[0054] In one embodiment, the voltage regulation chip 10 further includes: a power supply voltage pin VCC, a power supply detection pin PG, a voltage input pin VIN, an overcurrent protection pin OCP, a voltage compensation pin BIAS, a feedback pin FB, and a ground pin GND. Among them, the power supply voltage pin VCC is used to receive the power supply voltage. The power supply detection pin PG is connected to the load voltage output pin VOUT and is used to detect whether the power supply state of the power supply circuit is normal. The voltage input pin VIN is used to access the input voltage. The overcurrent protection pin OCP is grounded through an overcurrent protection resistor Rocp so that when the internal current of the voltage regulation chip 10 exceeds a specified current threshold, current limiting can be performed through the overcurrent protection resistor Rocp, thereby ensuring the safety of the voltage regulation chip 10. The voltage compensation pin BIAS is grounded through a second filter capacitor C2 and is used to supply power to the internal logic circuit of the voltage regulation chip 10. The feedback pin FB is grounded through an eighth voltage dividing resistor R8. The eighth voltage dividing resistor R8 is used to be connected in series with a ninth voltage dividing resistor R9 to access the load voltage, and according to the comparison result between the voltage flowing into the eighth voltage dividing resistor R8 and the reference voltage Vref of the voltage regulation chip 10, control the load voltage output by the load voltage output pin VOUT, thereby ensuring the output stability of the load voltage. The ground pin GDN is grounded.

[0055] As Figure 2 shown, the power supply protection circuit further includes a fourth voltage dividing resistor R4 and a fifth voltage dividing resistor R5, so that when the internal logic loop of the voltage regulation chip 10 is in an open state, the power supply protection circuit can be prevented from being misactivated, thereby helping to extend the service life of the power supply protection circuit. Specifically, the fourth voltage dividing resistor R4 is disposed between the first connection point A and the collector of the second triode Q2. The fifth voltage dividing resistor R5, the first end of the fifth voltage dividing resistor R5 is connected to the base of the first triode Q2, and the second end of the fifth voltage dividing resistor R5 is grounded.

[0056] As Figure 3 shown, the power supply protection circuit further includes a temperature sensor 20, a voltage dividing branch, and a third triode Q3. Among them, the voltage dividing branch includes a sixth voltage dividing resistor R6 and a seventh voltage dividing resistor R7. The first end of the sixth voltage dividing resistor R6 is used to access a target voltage, and the target voltage is used to represent the temperature state detected by the temperature sensor 20. The second end of the sixth voltage dividing resistor R6 is connected to the first end of the seventh voltage dividing resistor R7, and the second end of the seventh voltage dividing resistor R7 is grounded. The third triode Q3, the base of the third triode Q3 is connected to the fifth connection point between the second end of the sixth voltage dividing resistor R6 and the first end of the seventh voltage dividing resistor R7. The collector of the third triode Q3 is connected to the first enable pin EN, and the emitter of the third triode Q3 is grounded.

[0057] The temperature sensor 20 is used to monitor whether the temperature of the circuit board where the power supply circuit is located is normal, so that when the temperature of the circuit board where the power supply circuit is located is abnormal, an alarm can be issued through the logic control element for prompt. The third triode Q3 can be understood as a switch for monitoring whether the temperature of the power supply circuit is abnormal. The target voltage has different voltage values corresponding to different temperature states. For example: the higher the temperature, the higher the target voltage value for the first end of the sixth voltage-dividing resistor R6 to be connected. Connected in the above manner, when the temperature sensor 20 monitors that the temperature is greater than the temperature threshold, after the target voltage is divided by the sixth voltage-dividing resistor R6, the divided voltage to be input into the seventh voltage-dividing resistor R7 will turn on the base of the third triode Q3, and then the level state of the enable signal to be connected to the first enable pin EN can be changed through the third triode Q3, so as to achieve the purpose of ensuring power supply safety and avoiding the problem of board burning caused by too high temperature of the power supply circuit. When the temperature sensor 20 monitors that the temperature is less than or equal to the temperature threshold, after the target voltage is divided by the sixth voltage-dividing resistor R6, the divided voltage to be input into the seventh voltage-dividing resistor R7 will not turn on the base of the third triode Q3, and then there is no need to change the level state of the enable signal to be connected to the first enable pin EN through the third triode Q3.

[0058] In an implementation scenario, taking the enable signal that controls the internal logic circuit of the voltage adjustment chip to be in the conducting state as a high-level signal as an example, when the temperature of the circuit board where the power supply circuit is located is higher than the temperature threshold, after the target voltage connected to the first end of the sixth voltage-dividing resistor is divided by the sixth voltage-dividing resistor R6, the divided voltage to be input into the seventh voltage-dividing resistor R7 will turn on the base of the third triode Q3, making the third triode Q3 in the conducting state, and making the enable signal grounded through the third triode Q3, so as to achieve the purpose of pulling down the level state of the enable signal, making the internal logic circuit of the voltage adjustment chip in the disconnected state, controlling the power supply circuit to stop power supply, thus ensuring the power supply safety of the power supply circuit, avoiding the problem of board burning caused by too high temperature of the power supply circuit, helping to reduce the influence range of abnormal output voltage, and reducing economic losses.

[0059] In an embodiment, when the filter capacitor in the power supply circuit is damaged due to thermal stress or mechanical stress, it may be in a semi-damaged state. At this time, the capacitor is neither short-circuited nor open-circuited, but presents a state with a certain resistance value. The output current will flow to the ground through the damaged capacitor, generating heat and accumulating, the temperature rises, further damaging the capacitor until it causes the capacitor to burn. Therefore, to avoid the above situation, the temperature sensor 20 is placed near the filter capacitor in the power supply circuit, so that when the filter capacitor is damaged and leaks slowly, causing heat accumulation, it can be detected in time through the temperature sensor 20, and then the power supply safety can be ensured in time.

[0060] Such as Figure 4As shown, the power supply protection circuit further includes an AND gate circuit 30. The first input terminal of the AND gate circuit 30 is used to receive the input voltage output by the power supply circuit. The second input terminal of the AND gate circuit 30 is connected to the signal output terminal of the temperature sensor 20, and the signal output terminal is used to output the target voltage. The output terminal of the AND gate circuit 30 is connected to the first end of the sixth voltage dividing resistor R6. By setting the AND gate circuit, it can be ensured that the reason for the excessive current temperature is the heat accumulation caused by the slow leakage of the filter capacitor during the power supply process of the power supply circuit, thereby achieving the purpose of protecting the subsequent circuit in a timely manner, which helps to reduce the potential risk of the load device or board being burned, reduce the influence range of the abnormal output voltage, and reduce economic losses.

[0061] As Figure 5 shown, the power supply protection circuit further includes a first filter capacitor C1. The first filter capacitor C1 is connected in parallel with the seventh voltage dividing resistor R7, so as to ensure the working stability of the power supply protection circuit when the temperature of the electronic board where the power supply circuit is located is normal and the base of the third transistor Q3 is not conducting.

[0062] In an implementation scenario, combined with Figure 5 , taking the enable signal that controls the internal logic circuit of the voltage adjustment chip to be in the conducting state as a high-level signal as an example, the working principle of the power supply protection circuit provided by the present invention can be as follows:

[0063] If the enable signal received by the first enable pin EN of the voltage adjustment chip 10 from the second enable pin of the logic control device is a high-level signal, the internal logic circuit of the voltage adjustment chip 10 is in the conducting state, and the voltage flowing through the fourth voltage dividing resistor R4 to the base of the first transistor Q1 will be higher than the base conduction voltage, making the working state of the first transistor Q1 in the conducting state. Then, the load voltage output through the load voltage output pin VOUT can be output to the first voltage dividing resistor R1 through the first transistor Q1 and then grounded. If the enable signal received by the first enable pin EN of the voltage adjustment chip 10 from the second enable pin of the logic control device is a low-level signal, the internal logic circuit of the voltage adjustment chip 10 is in the disconnected state, and then the first transistor Q1 does not work.

[0064] When the enable signal received by the first enable pin EN of the voltage adjustment chip 10 from the second enable pin of the logic control device is a high-level signal, and the internal current of the voltage adjustment chip 10 is less than or equal to the specified current threshold, the working state of the first transistor Q1 is in the conducting state, and the working state of the second transistor Q2 is in the disconnected state.

[0065] For example: The first triode Q1 and the second triode Q2 are both silicon triodes, the base conduction voltage is 0.7V, the first resistance value of the first voltage-dividing resistor R1 is 0.1Ω, the second resistance value of the second voltage-dividing resistor R2 is 100Ω, the third resistance value of the third voltage-dividing resistor R3 is 1000Ω, and the preset voltage connected to the third voltage-dividing resistor R3 is 3.3V. Then, when no load is connected, the voltage connected to the base of the second triode Q2 is:

[0066]

[0067] Therefore, when no load is connected, the voltage connected to the base of the second triode Q2 is less than 0.7V, and the operating state of the second triode Q2 is the off state.

[0068] When the first enable pin EN of the voltage regulation chip 10 receives an enable signal sent by the second enable pin of the logic control device and the enable signal is a high-level signal, but the internal current of the voltage regulation chip 10 is greater than the specified current threshold, the operating state of the second triode Q2 will be in the on state, and the enable signal is grounded through the second triode Q2, resulting in the level state of the enable signal being converted from the high-level state to the low-level state, so that the first enable pin EN receives the enable signal as the low-level signal. Furthermore, the internal logic circuit of the voltage regulation chip 10 is controlled to be in the off state, and the power supply circuit is controlled to stop supplying power, thereby ensuring the safety of the backend load and avoiding the occurrence of the situation of burning the board.

[0069] For example: After the first enable pin EN receives a high-level enable signal, the base voltage of the first triode Q1 increases, and the operating state of the first triode Q1 is in the on state. The load voltage output by the load voltage output pin VOUT will have a voltage drop through the first voltage-dividing resistor R1, and then the base potential of the second triode Q2 will increase. When the voltage is greater than the base conduction voltage 0.7V of the first triode Q1, the second triode Q2 will act, and it will further determine whether to control the internal logic circuit of the voltage regulation chip 10 to be in the off state. Therefore, the specified current threshold can be determined in advance to determine, based on the specified current threshold, when the internal current of the voltage regulation chip 10 exceeds a certain value, it will cause the internal logic circuit of the voltage regulation chip 10 to be in the off state, and then stop the power supply circuit from continuing to supply power.

[0070] When no load is connected, the voltage connected to the base of the second triode Q2 is 0.3V, and the first resistance value of the first voltage-dividing resistor R1 is 0.1Ω, the specified current threshold is:

[0071]

[0072] Therefore, when the internal current of the voltage regulation chip 10 is greater than 4A, the base voltage of the second triode Q2 will be greater than 0.7V, causing the second triode Q2 to be in a conducting state. The enable signal received by the first enable pin EN can be a low-level signal, which in turn causes the internal logic circuit of the voltage regulation chip 10 to be in an off state, stopping the power supply circuit from continuing to supply power.

[0073] When the enable signal received by the first enable pin EN of the voltage regulation chip 10 from the second enable pin of the logic control device is a high-level signal, but the temperature detected by the temperature sensor 20 is higher than the temperature threshold, after the divided voltage of the target voltage connected to the first end of the sixth voltage-dividing resistor R6 flows through the sixth voltage-dividing resistor R6 and is about to flow into the seventh voltage-dividing resistor R7, it will turn on the base of the third triode Q3, causing the third triode Q3 to be in a conducting state. The enable signal is grounded through the third triode Q3, causing the level state of the enable signal to change from a high-level state to a low-level state, and the enable signal received by the first enable pin EN is a low-level signal. This in turn controls the internal logic circuit of the voltage regulation chip 10 to be in an off state, controlling the power supply circuit to stop supplying power, thereby ensuring the power supply safety of the power supply circuit and avoiding the problem of board burning caused by the overheating of the power supply circuit. This helps to reduce the influence range of abnormal output voltage and reduce economic losses. At the same time, when the temperature detected by the temperature sensor 20 is higher than the temperature threshold, an alarm can be issued through the logic control element for prompt, so as to notify relevant personnel for maintenance in a timely manner, providing convenience for troubleshooting, so that relevant personnel can quickly lock the fault location.

[0074] Through the power supply protection circuit provided by the present invention, it is possible to output corresponding signals according to the magnitude of the current output by the power supply circuit and the temperature signal to control the power supply state of the power supply circuit, so as to avoid the occurrence of abnormal voltage output caused by capacitor damage and output short circuit, thereby helping to ensure the power supply safety and stability of the power supply circuit.

[0075] Based on the same inventive concept, the present invention also provides a switching power supply circuit, including any one of the power supply protection circuits provided by the present invention. Through the switching power supply circuit provided by the present invention, it is possible to ensure the safety and stability of power supply, and help to improve the service life of the switching power supply circuit.

[0076] Based on the same inventive concept, the present invention also provides a server, including the switching power supply circuit provided by the present invention, which can ensure the power supply stability of the power supply circuit, and thus help to extend the service life of the server and improve the user experience.

[0077] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0078] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] The logic and / or steps represented in the flowchart or otherwise described herein can, for example, be considered as a definitional sequence of executable instructions for implementing logical functions, and can be embodied in any computer-readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device. For the purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection portion having one or more wirings (electronic device), a portable computer diskette case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable storage medium can even be paper or other suitable medium on which the program can be printed, as the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or otherwise processing it as appropriate, and then storing it in a computer memory.

[0080] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), and the like.

[0081] In the description of this specification, the descriptions referring to terms such as "this embodiment", "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0082] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and simple improvements made to the substantial content of the present invention shall be included within the protection scope of the present invention.

Claims

1. A power supply protection circuit, characterized in that, The power supply protection circuit includes: A voltage regulation chip, including a first enable pin and a load voltage output pin. The first enable pin is connected to the second enable pin of a logic control device. The first enable pin is used to receive an enable signal sent by the logic control device through the second enable pin. The load voltage output pin is used to output a load voltage to the load. A first triode. The base of the first triode is connected to a first connection point between the first enable pin and the second enable pin. The collector of the first triode is connected to the load voltage output pin. The emitter of the first triode is grounded through a first voltage-dividing resistor. A second triode. A second voltage-dividing resistor is connected in series between the base of the second triode and the first voltage-dividing resistor. The second voltage-dividing resistor is used to be connected in series with a third voltage-dividing resistor and then connected to a preset voltage. The collector of the second triode is connected to the base of the first triode. The emitter of the second triode is grounded.

2. The power supply protection circuit according to claim 1, wherein The first resistance value of the first voltage-dividing resistor is less than the second resistance value of the second voltage-dividing resistor. The second resistance value of the second voltage-dividing resistor is less than the third resistance value of the third voltage-dividing resistor.

3. The power supply protection circuit according to claim 1 or 2, characterized in that It further includes: A fourth voltage-dividing resistor, arranged between the first connection point and the collector of the second triode. A fifth voltage-dividing resistor. The first end of the fifth voltage-dividing resistor is connected to the base of the first triode, and the second end of the fifth voltage-dividing resistor is grounded.

4. The power supply protection circuit according to claim 3, wherein, The logic control device is a complex programmable logic device.

5. The power supply protection circuit according to claim 1 or 2, characterized in that, It further includes: A temperature sensor; A voltage-dividing branch, including a sixth voltage-dividing resistor and a seventh voltage-dividing resistor. The first end of the sixth voltage-dividing resistor is used to connect to a target voltage, and the target voltage is used to represent the temperature state detected by the temperature sensor. The second end of the sixth voltage-dividing resistor is connected to the first end of the seventh voltage-dividing resistor, and the second end of the seventh voltage-dividing resistor is grounded. A third triode. The base of the third triode is connected to a fifth connection point between the second end of the sixth voltage-dividing resistor and the first end of the seventh voltage-dividing resistor. The collector of the third triode is connected to the first enable pin, and the emitter of the third triode is grounded.

6. The power supply protection circuit according to claim 5, wherein It further includes: An AND gate circuit. The first input terminal of the AND gate circuit is used to receive an input voltage output by a power supply circuit. The second input terminal of the AND gate circuit is connected to the signal output terminal of the temperature sensor, and the signal output terminal is used to output the target voltage. The output terminal of the AND gate circuit is connected to the first end of the sixth voltage-dividing resistor.

7. The power supply protection circuit according to claim 6, wherein It further includes: A first filter capacitor, which is connected in parallel with the seventh voltage-dividing resistor.

8. The power supply protection circuit according to claim 1, wherein, The voltage regulation chip further includes: A power supply voltage pin, used to receive a power supply voltage; A power supply detection pin, connected to the load voltage output pin; A voltage input pin, used to connect to an input voltage; An overcurrent protection pin, grounded through an overcurrent protection resistor; A voltage compensation pin, grounded through a second filter capacitor; A feedback pin, grounded through an eighth voltage-dividing resistor. The eighth voltage-dividing resistor is used to be connected in series with a ninth voltage-dividing resistor and then connected to the load voltage; A ground pin, grounded.

9. A switching power supply circuit, characterized in that, Including the power supply protection circuit according to any one of claims 1-8.

10. A server, characterized in that, Including the switching power supply circuit according to claim 9.

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