CN112181885B - Hot plug circuit, mainboard and server system - Google Patents

Hot plug circuit, mainboard and server system Download PDF

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Publication number
CN112181885B
CN112181885B CN202010902586.6A CN202010902586A CN112181885B CN 112181885 B CN112181885 B CN 112181885B CN 202010902586 A CN202010902586 A CN 202010902586A CN 112181885 B CN112181885 B CN 112181885B
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circuit
connector
electrically connected
self
terminal
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CN112181885A (en
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邓建廷
王海岩
胡远明
秦晓宁
孙寰宇
路云飞
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Nettrix Information Industry Beijing Co Ltd
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Nettrix Information Industry Beijing Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G06F13/4081—Live connection to bus, e.g. hot-plugging
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The application provides a hot plug circuit, a mainboard and a server system. The hot plug circuit comprises: the circuit comprises a connector, a switching circuit, a self-recovery protection circuit and a control circuit. The connector is used for electrically connecting a load. The first end of the switch circuit is electrically connected with the first end of the connector. The first end of the self-recovery protection circuit is electrically connected with the second end of the switch circuit. The second terminal of the self-recovery protection circuit is used for receiving a supply voltage. The first end of the control circuit is electrically connected with the second end of the connector. And the second end of the control circuit is electrically connected with the control end of the switch circuit. The third end of the control circuit is electrically connected with the first end of the switch circuit. The control circuit is used for determining whether to control the switch circuit to be conducted according to whether the load is electrically connected with the connector.

Description

Hot plug circuit, mainboard and server system
Technical Field
The application relates to the technical field of servers, in particular to a hot plug circuit, a mainboard and a server system.
Background
As server performance increases, there is a concomitant need for greater power consumption. According to data statistics of 2019-2020, the power consumption of the CPU reaches over 300W, and the power consumption of the GPU is improved to 400W. In foreseeable iterative products, the power consumption of each key electronic device in the server is on a continuing trend. The increased power consumption of the server poses a significant challenge to the heat dissipation capability of the server.
Servers are typically equipped with heat sinks to dissipate the heat. The fan part is a core part of the heat sink. The server needs to be continuously radiated by the radiating device in the normal working process so as to reduce the working temperature of the electronic devices in the server. At some special times, it is desirable to allow the server to perform maintenance of the fan assembly while it is on. For example, when the fan unit is out of order or works poorly, it is necessary to cut off the electrical connection between the fan unit and the motherboard without stopping the operation of the server. And in the starting state, the electric connection between the fan component and the mainboard is cut off, namely the hot plugging of the fan component is realized.
In the hot plugging process, instant surge current may be generated, thereby affecting the normal operation of the mainboard of the server. During hot plugging, voltage overshoot may also be caused to damage the fan components. At present, surge current or voltage overshoot may be generated by traditional hot plugging, and the hidden trouble of damaging circuit components exists.
Disclosure of Invention
Therefore, the hot plug circuit, the mainboard and the server system are provided for solving the problems that surge current or voltage overshoot may be generated in the traditional hot plug and the hidden danger of damaging circuit components is caused.
A hot swap circuit, comprising:
a connector for electrically connecting a load;
a switch circuit, a first end of the switch circuit being electrically connected to a first end of the connector;
a self-recovery protection circuit, a first end of the self-recovery protection circuit being electrically connected to a second end of the switching circuit; and
and the first end of the control circuit is electrically connected with the second end of the connector, the second end of the control circuit is electrically connected with the control end of the switch circuit, the third end of the control circuit is electrically connected with the second end of the switch circuit, and the control circuit is used for determining whether to control the switch circuit to be switched on or not according to whether the load is electrically connected with the connector or not.
In this embodiment, the control circuit may control whether the switch circuit is turned on according to whether the load is electrically connected to the connector, and may be matched with the self-recovery protection circuit, so that overcurrent protection may be implemented by the self-recovery protection circuit during hot plugging, thereby preventing surge current or voltage overshoot generated by hot plugging from damaging components.
In one embodiment, the self-recovery protection circuit includes:
and a first end of the self-recovery fuse is electrically connected with the second end of the switch circuit, and the second end of the self-recovery fuse is used for receiving the power supply voltage.
In this embodiment, the self-recovery protection circuit adopts a self-recovery fuse, and can automatically reset after overcurrent protection without replacing the fuse, thereby simplifying operation.
In one embodiment, if the load is electrically connected with the connector, the control circuit controls the switch circuit to be conducted;
and if the load is not electrically connected with the connector, the control circuit controls the switch circuit to be disconnected.
In this embodiment, when the load is electrically connected to the connector, the control circuit controls the switch circuit to be turned on; when the load is not electrically connected with the connector, the control circuit controls the switch circuit to be disconnected, so that the hot plug function can be realized.
In one embodiment, the control circuit comprises:
a first resistor, a first end of the first resistor being electrically connected to a second end of the connector;
a first end of the second resistor, a second end of the first resistor and a control end of the switch circuit are connected in common; and
and the first end of the first capacitor is electrically connected with the first end of the second resistor, and the second end of the first capacitor, the second end of the second resistor and the second end of the switch circuit are connected in common.
In this embodiment, the first resistor, the second resistor, and the first capacitor form an RC charging and discharging control circuit, so as to control on and off of the switching circuit, and have the advantage of simple structure.
In one embodiment, the second terminal of the self-recovery protection circuit is configured to receive a supply voltage, if the load is electrically connected to the connector, a terminal voltage between the second terminal of the switching circuit and the control terminal of the switching circuit is less than a threshold voltage of the switching circuit, and the terminal voltage satisfies the following formula:
Figure BDA0002660266370000031
wherein R is 1 Is the resistance value, R, of the first resistor 2 Vs is the supply voltage, which is the resistance of the second resistor.
In this embodiment, the terminal voltage is smaller than the threshold voltage by the charge-discharge characteristics of the first resistor, the second resistor and the first capacitor and the configuration of the resistance values of the first resistor and the second resistor, so as to improve the reliability of controlling the conduction of the switch circuit.
In one embodiment, the second terminal of the self-recovery protection circuit is configured to receive a supply voltage, and the soft-start time from the beginning of conduction to the complete conduction of the switching circuit satisfies the following equation:
Figure BDA0002660266370000041
wherein, V C Is the voltage across said first capacitor, V s Is the supply voltage, t is the slow start time, R 1 Is the resistance value of the first resistor, C 1 Is the capacity of the first capacitor.
In this embodiment, the slow start time of the switching circuit is adjusted by configuring the resistance-capacitance values of the first resistor, the second resistor, and the first capacitor, so that the impact of surge current can be further avoided, and the reliability is improved.
In one embodiment, the connector is a 6-pin or higher connector, and the connector is electrically connected to the load by a jumper wire.
In this embodiment, the connectors are connected to the loads through jumpers, and the connectors are unified into 6-pin or more-than-6-pin connectors, so that unified management of the loads can be realized.
In one embodiment, the hot plug circuit further comprises:
and a first end of the follow current circuit is connected with a first end of the self-recovery protection circuit and a second end of the switch circuit in a common mode, and a second end of the follow current circuit is grounded.
In this embodiment, after the self-recovery protection circuit performs overload protection, the follow current circuit may perform follow current buffering, so as to further protect components in the circuit.
A mainboard comprises the hot plug circuit in any one of the above embodiments.
In this embodiment, whether the switch circuit is turned on or not is controlled by the control circuit according to whether the load is electrically connected with the connector or not, and the switch circuit is matched with the self-recovery protection circuit, so that overcurrent protection of the mainboard can be realized by the self-recovery protection circuit in a hot plug process, and thus surge current or voltage overshoot generated by hot plug is prevented from damaging components.
A server system, comprising the motherboard according to the above embodiment; and
the load is detachably and electrically connected with the connector.
In this embodiment, whether the switch circuit is turned on or off is controlled by the control circuit according to whether the load is electrically connected to the connector, and the control circuit is matched with the self-recovery protection circuit, so that overcurrent protection of the server system can be realized by the self-recovery protection circuit in a hot plugging process, and thus components and parts are prevented from being damaged by surge current or voltage overshoot generated by hot plugging.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a hot swap circuit according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a hot swap circuit according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a hot swap circuit according to another embodiment of the present application;
fig. 4 is a circuit block diagram of a motherboard according to an embodiment of the present application;
fig. 5 is a block diagram of a server system according to an embodiment of the present application.
Description of reference numerals:
10. a hot plug circuit; 100. a connector; 101. a load; 20. a main board; 200. a switching circuit; 30. a server system; 300. a self-recovery protection circuit; 310. a self-healing fuse; 400. a control circuit; 410. a first resistor; 420. a second resistor; 430. a first capacitor; 500. a freewheel circuit; 600. and a filter circuit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and those skilled in the art will recognize that many modifications may be made without departing from the spirit and scope of the present application and that the present application is not limited to the specific implementations disclosed below.
The numbering scheme used herein for the components as such, e.g., "first", "second", etc., is used for the purpose of describing the objects only, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified. In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present disclosure provides a hot plug circuit 10, which is applicable to a server motherboard. The hot swap circuit 10 comprises a connector 100, a switch circuit 200, a self-healing protection circuit 300, and a control circuit 400. The connector 100 is used to electrically connect a load 101. A first terminal of the switching circuit 200 is electrically connected to a first terminal of the connector 100. A first terminal of the self-healing protection circuit 300 is electrically connected to a second terminal of the switching circuit 200. The second terminal of the self-recovery protection circuit 300 is configured to receive a supply voltage. A first end of the control circuit 400 is electrically connected to a second end of the connector 100. A second terminal of the control circuit 400 is electrically connected to a control terminal of the switch circuit 200. The third terminal of the control circuit 400 is electrically connected to the second terminal of the switching circuit 200. The control circuit 400 is used for determining whether to control the switch circuit 200 to be turned on according to whether the load 101 is electrically connected to the connector 100.
In one embodiment, the number of pins of the connector 100 can be selected according to actual requirements as long as a ground loop is ensured inside the connector 100. For example, the connector 100 may be a 6-pin connector. The connector 100 may also be a 16 pin connector. In one embodiment, the load 101 may be a fan. In one embodiment, the load 101 may also be another load with a hot-plug function. In one embodiment, the connector 100 may select a 6-pin or more than 6-pin connector, so that a unified management of the load 101 may be achieved.
In one embodiment, the connector 100 is removably electrically connected to the load 101. I.e. a pluggable electrical connection between the load 101 and the connector 100. Specifically, the load 101 and the connector 100 may be connected by a male connector and a female connector. For example, a male connector is disposed on the load 101, and a female connector is disposed on the connector 100. Or, a female head is arranged on the load 101, and a male head matched with the female head is arranged on the connector 100. The male and female connectors are matched to realize the plug-in connection between the load 101 and the connector 100.
It is understood that the specific circuit structure of the switch circuit 200 is not limited as long as the control circuit 400 can determine whether to control the switch circuit 200 to be turned on according to whether the load 101 is electrically connected to the connector 100. In one embodiment, the switching circuit 200 may be a switching tube. For example, the switch tube may be an N-type MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). The switch tube may also be an IGBT (Insulated Gate Bipolar Transistor).
It is understood that the specific circuit topology of the self-healing protection circuit 300 is not limited as long as it has the function of self-healing after overcurrent protection. In one embodiment, the self-healing protection circuit 300 may employ a self-healing fuse. For example, the self-healing fuse may be a polymeric polymer PPTC. The self-healing fuse may also be a ceramic CPTC. In one embodiment, the self-recovery protection circuit 300 may be matched according to the total power consumption of the load 101, as long as the self-recovery protection circuit 300 is ensured to have the overcurrent protection function on the load 101. For example, the open circuit current of the self-healing protection circuit 300 may be set to 1.2-1.5 times the maximum power consumption value of the load 101.
In an embodiment, when the supply current corresponding to the supply voltage received by the self-recovery protection circuit 300 is greater than the open-circuit current of the self-recovery protection circuit 300, the self-recovery protection circuit 300 performs overcurrent protection to avoid damaging other components (such as the control circuit 400 and the switch circuit 200) in the circuit. The self-recovery protection circuit 300 can reset automatically after overcurrent protection, and has a function of repeated use. In one embodiment, the supply voltage may be a 12V supply voltage. The supply voltage may also be a 24V supply voltage. The supply voltage may be provided by a power supply.
It is understood that the specific circuit topology of the control circuit 400 is not limited as long as it has a function of determining whether to control the switching circuit 200 to be turned on according to whether the load 101 is electrically connected to the connector 100. In one embodiment, the control circuit 400 may be an RC charge-discharge network. In one embodiment, the control circuit 400 may also be a conventional integrated control chip.
In one embodiment, the determining whether to control the switch circuit 200 to be turned on according to whether the load 101 is electrically connected to the connector 100 by the control circuit 400 includes: if the load 101 is electrically connected to the connector 100, the control circuit 400 controls the switch circuit 200 to be turned on. Specifically, when the load 101 is electrically connected to the connector 100, the control circuit 400 may output a low level to the control terminal of the switch circuit 200, so as to turn on the switch circuit 200. That is, the power supply voltage may be provided to the load 101 through the self-recovery protection circuit 300, the switch circuit 200, and the connector 100 in this order.
On the contrary, if the load 101 is not electrically connected to the connector 100, the control circuit 400 controls the switch circuit 200 to be turned off. Specifically, when the load 101 is not electrically connected to the connector 100, the control circuit 400 may output a high level to the control terminal of the switch circuit 200, so that the switch circuit 200 is turned off. That is, the power supply voltage is provided to the second terminal of the switch circuit 200 through the self-recovery protection circuit 300. Since the switch circuit 200 is in the off state, the power supply voltage is not output to the connector 100. Thus, the hot plug function of the load 101 can be realized by adopting the above mode. Meanwhile, in the hot plugging process, overcurrent protection can be realized by matching the self-recovery protection circuit, so that the surge current or voltage overshoot generated by hot plugging is avoided from damaging components.
In one embodiment, if the load 101 is a fan, the connector 100 is a 6-pin connector, and the switch circuit 200 is an N-type MOSFET. When the fan is inserted into the 6-pin connector or the fan is electrically connected to the 6-pin connector through a jumper wire, the first terminal of the control circuit 400 is grounded through the 6-pin connector. That is, the control circuit 400 outputs a low level to the control terminal (i.e., the gate of the N-type MOSFET) of the switching circuit 200. At this time, a voltage drop is generated between the control terminal of the switch circuit 200 and the second terminal of the switch circuit 200 (i.e., the source of the N-type MOSFET), so that conduction is performed between the first terminal (i.e., the drain of the N-type MOSFET) and the second terminal of the switch circuit 200. At this time, the power supply voltage may be sequentially supplied to the fan through the self-recovery protection circuit 300, the N-type MOSFET, and the 6-pin connector.
When the fan is not inserted into the 6-pin connector or the fan is not electrically connected to the 6-pin connector, the first terminal of the control circuit 400 is not grounded. That is, the control circuit 400 outputs a high level to the control terminal of the switch circuit 200. At this time, the voltage drop between the control terminal of the switch circuit 200 and the second terminal of the switch circuit 200 is zero, and the first terminal and the second terminal of the switch circuit 200 are disconnected. The supply voltage is not output to the connector 100 at this time. Thus, the hot plug function of the fan can be realized by adopting the mode. Meanwhile, in the hot plugging process, overcurrent protection can be realized through the cooperation of the self-recovery protection circuit, so that the surge current or voltage generated by hot plugging is prevented from overshooting to damage components.
In this embodiment, the control circuit 400 may determine whether to control the switching circuit 200 to be turned on according to whether the load 101 is electrically connected to the connector 100, and may be matched with the self-recovery protection circuit 300, so that in the hot plugging process, overcurrent protection may be implemented by the self-recovery protection circuit 300, and thus, surge current or voltage overshoot generated by hot plugging may be prevented from damaging components.
Referring to fig. 2, in one embodiment, the self-healing protection circuit 300 includes: a self-healing fuse 310. A first terminal of the self-healing fuse 310 is electrically connected to a second terminal of the switching circuit 200. The second terminal of the self-healing fuse 310 is configured to receive the supply voltage. In one embodiment, the self-healing fuse 310 may be a polymer PPTC. In one embodiment, the open circuit current of the self-healing fuse 310 may be set to 1.2-1.5 times the maximum power consumption value of the load 101. The hot swap circuit 10 employs the self-healing fuse 310, which can reset itself after overcurrent protection. Compared with a common fuse, the fuse does not need to be replaced after overcurrent protection, so that the operation is simplified.
In one embodiment, the control circuit 400 includes: a first resistor 410, a second resistor 420 and a first capacitor 430. A first end of the first resistor 410 is electrically connected to a second end of the connector 100. The first terminal of the second resistor 420 is connected to the second terminal of the first resistor 410 and the control terminal of the switch circuit 200. A first terminal of the first capacitor 430 is electrically connected to a first terminal of the second resistor 420. The second terminal of the first capacitor 430 is connected to the second terminal of the second resistor 420 and the second terminal of the switch circuit 200.
In one embodiment, the first resistor 410 may be a fixed resistance resistor. The first resistor 410 may be a resistor with an adjustable resistance. Similarly, the second resistor 420 may be a fixed resistance resistor. The second resistor 420 may also be a resistor with an adjustable resistance. The RC charging and discharging control circuit formed by the first resistor 410, the second resistor 420 and the first capacitor 430 can control the on and off of the switch circuit 200. Compared with the traditional control circuit, the control circuit has the advantages of simple structure and low cost.
In one embodiment, if the load 101 is electrically connected to the connector 100, a terminal voltage between the second terminal of the switch circuit 200 and the control terminal of the switch circuit 200 is less than a threshold voltage of the switch circuit 200, and the terminal voltage satisfies the following formula:
Figure BDA0002660266370000111
wherein R is 1 Is the resistance value of the first resistor 410; r is 2 Is the resistance of the second resistor 420, and Vs is the supply voltage.
In one embodiment, if the switch circuit 200 is an N-type MOSFET, the voltage of the terminal is smaller than the threshold voltage by configuring the resistance values of the first resistor 410 and the second resistor 420, so as to improve the reliability of controlling the conduction of the N-type MOSFET. Specifically, when the load 101 is electrically connected to the connector 100, after the supply voltage flows through the self-recovery protection circuit 300, the terminal voltage between the gate and the source of the N-type MOSFET changes from zero to a negative value through the charging and discharging actions of the first resistor 410, the second resistor 420 and the first capacitor 430. That is, a voltage drop is generated between the gate and the source of the N-type MOSFET, and the terminal voltage between the gate and the source is smaller than the threshold voltage, at which time the N-type MOSFET starts to be turned on.
In one embodiment, the soft start time of the switching circuit 200 from the initial conduction to the full conduction satisfies the following formula:
Figure BDA0002660266370000121
wherein, V C Is the voltage across the first capacitor 430; v s Is the supply voltage; t is the slow start time; r 1 Is the resistance value of the first resistor 410; c 1 Is the capacity of the first capacitor 430.
In one embodiment, the slow start time refers to: the switching circuit 200 is turned on from the beginning to the time of full conduction. In one embodiment, the soft start time of the switch circuit 200 from being turned on to being fully turned on after the switch circuit 200 starts to be turned on can satisfy the above formula. The slow start time can be adjusted by configuring the resistance-capacitance values of the first resistor 410 and the first capacitor 430, so that the impact of surge current can be further avoided, and the reliability is improved.
For example, if the switch circuit 200 is an N-type MOSFET, the slow start time of the N-type MOSFET from being turned on to being fully turned on can be adjusted by configuring the capacitance values of the first resistor 410 and the first capacitor 430. Meanwhile, the resistance values of the first resistor 410 and the second resistor 420 can be configured, so that the terminal voltage between the gate and the source of the N-type MOSFET is smaller than the threshold voltage, and the reliability of controlling the conduction of the N-type MOSFET is improved. That is to say, the slow start time of the switch circuit 200 can be adjusted by configuring the resistance-capacitance values of the first resistor 410, the second resistor 420 and the first capacitor 430, and the reliability of controlling the switch circuit 200 to be turned on is improved. In one embodiment, the slow start time can be set to millisecond by configuring the rc values of the first resistor 410 and the first capacitor 430, so that the surge of the surge current can be effectively avoided.
Referring to fig. 3, in an embodiment, the hot plug circuit 10 further includes: a freewheel circuit 500. A first terminal of the free-wheeling circuit 500 is commonly connected with a first terminal of the self-recovery protection circuit 300 and a second terminal of the switching circuit 200. The second terminal of the freewheel circuit 500 is connected to ground.
It can be understood that the specific circuit topology of the freewheel circuit 500 is not limited, as long as the freewheel circuit has the function of protecting components in the circuit from being damaged. In one embodiment, the freewheel circuit 500 may be a freewheel diode. Specifically, the anode of the freewheeling diode is grounded. The cathode of the freewheeling diode is connected to the first terminal of the self-recovery protection circuit 300 and the second terminal of the switching circuit 200. After the load 101 is electrically connected to the connector 100, if the load 101 has a fault and the overcurrent protection of the self-recovery protection circuit 300 is performed, the freewheeling circuit 500 may perform freewheeling buffering, so as to further protect components (such as the switch circuit 200 and the control circuit 400) in the hot swap circuit 10 and avoid damage.
In one embodiment, the hot plug circuit 10 further comprises a filter circuit 600. A first terminal of the filter circuit 600 is electrically connected to a second terminal of the self-recovery protection circuit 300, and the second terminal of the filter circuit 600 is configured to receive the supply voltage. It is to be understood that the specific circuit structure of the filter circuit 600 is not limited as long as the filter circuit has a filtering function. In one embodiment, the filter circuit 600 may be formed by a capacitor C1 and a capacitor C2 connected in parallel. The filtering circuit 600 can filter out the interference in the power supply voltage, thereby improving the stability of the power supply voltage input to the self-recovery protection circuit 300.
Referring to fig. 4, another embodiment of the present application provides a main board 20. The motherboard 20 includes the hot plug circuit 10 according to any of the embodiments. In one embodiment, the motherboard 20 may be applied to a server system. In the motherboard 20 of this embodiment, whether to control the switching circuit 200 to be turned on is determined by the control circuit 400 according to whether the load 101 is electrically connected to the connector 100, and the control circuit is matched with the self-recovery protection circuit 300, so that overcurrent protection can be realized by the self-recovery protection circuit 300 in the hot plugging process, and thus, components and devices are prevented from being damaged by surge current or voltage overshoot generated by hot plugging.
Referring to fig. 5, another embodiment of the present application provides a server system 30. The server system 30 includes the motherboard 20 and the load 101 according to any of the above embodiments. The load 101 is removably electrically connected to the connector 100. In one embodiment, the load 101 is plug electrically connected to the connector 100. That is, the load 101 and the connector 100 can be connected by inserting and extracting through a male and a female connector. For example, a male head is arranged on the load 101, and a female head matched with the male head is arranged on the connector 100; or, a female head is arranged on the load 101, and a male head matched with the female head is arranged on the connector 100. That is, the plug connection between the load 101 and the connector 100 can be realized by the cooperation of the male and female connectors.
In the server system 30 of this embodiment, the control circuit 400 in the main board 20 determines whether to control the switch circuit 200 to be turned on according to whether the load 101 is electrically connected to the connector 100. Meanwhile, by matching with the self-recovery protection circuit 300, overcurrent protection can be realized through the self-recovery protection circuit 300 in the hot plugging process, so that surge current or voltage overshoot generated by hot plugging is prevented from damaging components.
In summary, the present application can determine whether to control the switch circuit 200 to be turned on according to whether the load 101 is electrically connected to the connector 100 by the control circuit 400. Meanwhile, by matching with the self-recovery protection circuit 300, overcurrent protection can be realized through the self-recovery protection circuit 300 in the hot plugging process, so that surge current or voltage overshoot generated by hot plugging is prevented from damaging components.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A hot swap circuit, comprising:
a connector (100) for electrically connecting a load (101);
a switch circuit (200), a first end of the switch circuit (200) being electrically connected to a first end of the connector (100);
a self-healing protection circuit (300), a first terminal of the self-healing protection circuit (300) being electrically connected to a second terminal of the switching circuit (200); and
a control circuit (400), the control circuit (400) comprising: a first resistor (410), a second resistor (420), and a first capacitor (430); a first end of the first resistor (410) is electrically connected with a second end of the connector (100); a first end of the second resistor (420) is connected with a second end of the first resistor (410) and a control end of the switch circuit (200) in common; a first end of the first capacitor (430) is electrically connected with a first end of the second resistor (420); the second end of the first capacitor (430) is connected with the second end of the second resistor (420) and the second end of the switch circuit (200) in common, and the control circuit (400) is used for determining whether to control the switch circuit (200) to be conducted according to whether the load (101) is electrically connected with the connector (100);
the hot plug circuit further comprises a filter circuit (600), and a first end of the filter circuit (600) is electrically connected with a second end of the self-recovery protection circuit (300); a second terminal of the filter circuit (600) is for receiving a supply voltage.
2. The hot plug circuit of claim 1, wherein the self-healing protection circuit (300) comprises:
a self-healing fuse (310), a first terminal of the self-healing fuse (310) being electrically connected with a second terminal of the switching circuit (200), the second terminal of the self-healing fuse (310) being adapted to receive a supply voltage.
3. A hot swap circuit according to claim 1, wherein the control circuit (400) controls the switch circuit (200) to conduct if the load (101) is electrically connected to the connector (100);
if the load (101) is not electrically connected with the connector (100), the control circuit (400) controls the switch circuit (200) to be disconnected.
4. The hot swap circuit of claim 1, wherein the second terminal of the self-healing protection circuit (300) is configured to receive a supply voltage, and wherein if the load (101) is electrically connected to the connector (100), a terminal voltage between the second terminal of the switch circuit (200) and the control terminal of the switch circuit (200) is less than a threshold voltage of the switch circuit (200), and wherein the terminal voltage satisfies the following equation:
Figure FDA0003882713080000021
wherein R is 1 Is the resistance value, R, of the first resistor (410) 2 Is the resistance value of the second resistor (420) and Vs is the supply voltage.
5. A hot plug circuit according to claim 4, wherein the load (101) is connected to the connector (100) by a male and a female connector.
6. The hot swap circuit of claim 1, wherein the second terminal of the self-recovery protection circuit (300) is configured to receive a supply voltage, and wherein the slow start time from the initial conduction to the full conduction of the switch circuit (200) satisfies the following equation:
Figure FDA0003882713080000022
wherein, V C Is the voltage across the first capacitor (430), vs is the supply voltage, t is the slow start time, R 1 Is the resistance value, C, of the first resistor (410) 1 Is the capacity of the first capacitor (430).
7. The hot plug circuit of claim 1, wherein the connector (100) is a 6-pin or higher connector and the connector (100) is electrically connected to the load (101) by a jumper.
8. The hot plug circuit of claim 1, further comprising:
and a free-wheeling circuit (500), wherein a first end of the free-wheeling circuit (500) is connected with a first end of the self-recovery protection circuit (300) and a second end of the switch circuit (200) in common, and a second end of the free-wheeling circuit (500) is connected with the ground.
9. Motherboard, characterized in that it comprises a hot-swap circuit (10) according to any of claims 1-8.
10. A server system, characterized in that it comprises a motherboard (20) as claimed in claim 9; and
the load (101) is detachably and electrically connected with the connector (100).
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