Power supply delay circuit and hot plug device

Abstract

The application relates to a power supply delay circuit and a hot plug device. The power supply delay circuit comprises a delay circuit, a first connecting end and a second connecting end. The delay circuit is connected with the first connecting end and the second connecting end. The first connecting end is used for connecting a power supply, and the second connecting end is used for connecting the power supply or a grounding end. The delay circuit is used for delaying the conduction of the power supply, so that the two power supplies are not conducted at the same time, or the power supply is conducted earlier than the grounding end, mutual interference between the power supplies is avoided, and the use reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular to a power supply delay circuit and hot plug device. BACKGROUND

[0002] With the development of science and technology and the continuous progress of society, more and more kinds of electronic devices appear in people's daily work and life, and the power supply amplitudes required between different parts inside the electronic device and between different electronic devices are often different.

[0003] The multi-power supply circuit can provide power supplies of different amplitudes to meet the power supply needs of different loads. However, in the multi-power supply circuit, hot plug will cause mutual interference between power supplies, and there is the disadvantage of low use reliability. SUMMARY

[0004] Therefore, it is necessary to provide a power supply delay circuit and hot plug device to solve the problem of mutual interference between power supplies caused by hot plug and low use reliability, so as to effectively improve the use reliability.

[0005] A power supply delay circuit, comprising a delay circuit, a first connection end and a second connection end, the delay circuit is connected to the first connection end and the second connection end, the first connection end is used for connecting a power supply, and the second connection end is used for connecting a power supply or a ground end; the delay circuit is used for delaying the conduction of the power supply, so that two power supplies are not conducted at the same time, or the power supply is conducted earlier than the ground end.

[0006] In one embodiment, the delay circuit comprises a switch tube, a first resistance component, a second resistance component and a capacitor component, the first end of the switch tube is connected to the first connection end, the second end of the switch tube is connected to the second connection end through a power supply load, the control end of the switch tube is connected to one end of the first resistance component and one end of the second resistance component, the other end of the first resistance component is connected to the first end of the switch tube, the other end of the second resistance component is connected to the second connection end, and the capacitor component is connected to the second resistance component in parallel.

[0007] In one embodiment, the switch tube is a MOS tube.

[0008] In one embodiment, the switch tube is a triode.

[0009] A hot plug device, comprising a daughter board, the daughter board comprising a power supply load and the above-mentioned power supply delay circuit.

[0010] In one embodiment, the hot plug device further comprises a mother board and an inter-board connection line, the mother board is connected to the daughter board through the inter-board connection line.

[0011] In one of the embodiments, the inter-board connection includes a daughter board line, a daughter end, a mother end and a mother board line, the daughter end connects the daughter board through the daughter board line, the mother end matches the daughter end and connects the mother board through the mother board line.

[0012] In one of the embodiments, the mother board is provided with a power supply and a grounding end, the power supply and the grounding end are connected with the daughter board through the inter-board connection.

[0013] In one of the embodiments, the number of the power supplies is more than two.

[0014] In one of the embodiments, the output voltages of the power supplies are different from each other.

[0015] The power supply delay circuit and the hot plug device set delay circuits between the power supplies or between the power supplies and the grounding end, so that the two power supplies are not turned on at the same time or the power supply is turned on earlier than the grounding end, avoiding mutual interference between the power supplies and improving the use reliability. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 It is a structure schematic diagram of the power supply delay circuit in one embodiment;

[0018] Figure 2 It is a scene schematic diagram of the power supply delay circuit in one embodiment;

[0019] Figure 3 It is a structure schematic diagram of the hot plug device in one embodiment;

[0020] Figure 4 It is a structure schematic diagram of the hot plug device in one embodiment;

[0021] Explanation of reference signs: 110-delay circuit; V1-24V DC power supply; V2-5V DC power supply; GND-ground network; R4-motherboard 5V power supply load; C3-motherboard 5V power supply emission end filtering capacitor; R3-motherboard 5V power supply emission end filtering resistor; K1-motherboard and sub-board 24V power supply connection port; K2-motherboard and sub-board 5V power supply connection port; K3-motherboard and sub-board GND ground connection port; D1-sub-board chip internal parasitic diode; C4-sub-board 5V power supply entering end filtering capacitor; R5-sub-board 24V power supply entering end filtering resistor; C2-sub-board 24V power supply entering end filtering capacitor; MOS-MOS tube; R1-resistor; R2-the same resistor as R1; C1 is a SMD capacitor. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not intended to limit the present application.

[0023] Unless otherwise defined, 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 in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0024] It will be understood that the spatially relative terms "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0025] It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intervening element. "Connected" in the following examples, if the connected circuit, module, unit, etc. have the transmission of electrical signals or data between each other, should be understood as "electrically connected", "communicatively connected" and the like.

[0026] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", or the like, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. Also, the term "exemplary" is used herein to mean an example or illustration, and is not used in a limiting sense to designate the optimum.

[0027] In one embodiment, a power delay circuit is provided, which can be applied in a sensitive circuit to ensure the turn-on sequence of power supply during hot plug. Figure 1 As shown in the figure, the power delay circuit includes a delay circuit 110, a first connection end and a second connection end, the delay circuit 110 is connected to the first connection end and the second connection end, the first connection end is used to connect the power supply, and the second connection end is used to connect the power supply or the ground end; the delay circuit 110 is used to delay the turn-on of the power supply, so that the two power supplies are not turned on at the same time, or the power supply is turned on earlier than the ground end. It can be understood that when the first connection end and the second connection end are both connected to the power supply, it means that the first connection end and the second connection end are connected to different power supplies respectively.

[0028] Specifically, the delay circuit 110 can be arranged on the power supply load side, and the power supply load is connected to the power supply side through a hot plug interface, which includes a power supply interface and a ground interface. According to actual needs, the first connection end of the power delay circuit is connected to the power supply interface, and the second interface of the power delay circuit is connected to the ground interface or another power supply interface. During the hot plug process, the delay circuit 110 delays the turn-on of the power supply, avoids the simultaneous turn-on of the two power supplies, or makes the power supply turn on earlier than the ground end, thereby preventing mutual interference between multiple power supplies, ensuring the turn-on sequence of the power supply during hot plug, and thus playing a role in protecting the circuit. When avoiding the simultaneous turn-on of the two power supplies, the delay circuit 110 can delay one of the power supplies, for example, the power supply with a high output voltage; the delay circuit 110 can also delay both of the power supplies, and avoid the simultaneous turn-on of the two power supplies by controlling different delay times.

[0029] In addition, according to the number of power supplies, the number of delay circuits 110 and the number of first connection ends and second connection ends will also be different. For example, Figure 2As shown, the delay circuit 110 can be located between the ground terminal GND and the power supply, or between two power supplies. The best conduction sequence is that the ground terminal GND is conducted first, then the power supply 3, then the power supply 2, and then the power supply 1. Among them, a delay circuit 110 can be arranged between the power supply 1, the power supply 2, the power supply 3 and the ground terminal GND, and each delay circuit 110 is connected with the power supply or the ground terminal GND through the corresponding first connection end and second connection end. Specifically, in a system of three power supplies and ground, the delay circuit 110 is located between each power supply, which ensures that after the ground terminal GND is conducted, the power supply 3 is conducted after a delay time, the power supply 2 is conducted after the power supply 3, and the power supply 1 is conducted after the power supply 2, thereby effectively avoiding interference between multiple power supplies and controlling the conduction sequence of the power supply.

[0030] It should be noted that the conduction sequence between each power supply and the ground terminal GND is not fixed, and the conduction sequence can be selected according to different circuit path conditions, for example, if the power supply 2 needs to be conducted before the power supply 3, the delay circuit is added to the path between the power supply 3 and the power supply 2, which ensures that the power supply 2 is conducted first and then the power supply 3 is conducted. Alternatively, if the ground terminal GND needs to be conducted before the power supply 1, the delay circuit is added to the path between the power supply 1 and the ground terminal GND, which ensures that the ground terminal GND is conducted first and then the power supply 1 is conducted.

[0031] It can be understood that the specific structure of the delay circuit 110 is not unique. In an embodiment, as shown in Figure 1 The delay circuit 110 includes a switch tube, a first resistance component, a second resistance component and a capacitor component. The first end of the switch tube is connected to the first connection end, the second end of the switch tube is connected to the second connection end through the power supply load, the control end of the switch tube is connected to one end of the first resistance component and one end of the second resistance component, the other end of the first resistance component is connected to the first end of the switch tube, the other end of the second resistance component is connected to the second connection end, and the capacitor component is connected to the second resistance component in parallel. Specifically, the switch tube can be a selection MOS tube or a triode. In this embodiment, the switch tube is an N-channel MOS tube, the gate is the control end, the drain is the first end, and the source is the second end. The first resistance component and the second resistance component can be a single resistance or a plurality of resistances connected in series, parallel or mixed. In this embodiment, the first resistance component is a resistor R1, and the second resistance component is a resistor R2. The capacitor component functions as a charging delay, and the switch tube is turned on when the capacitor is charged to the conduction voltage. The capacitor component can be a single capacitor or a plurality of capacitors connected in series or parallel. In this embodiment, the capacitor component is a patch capacitor C1, and the patch capacitor C1 is connected to the resistor R2 in parallel.

[0032] The power supply delay circuit is arranged between the power supply and the power supply, or between the power supply and the ground terminal, so that the two power supplies are not turned on at the same time, or the power supply is turned on earlier than the ground terminal, thereby avoiding mutual interference between the power supplies and improving the use reliability.

[0033] In one embodiment, a hot plug device is also provided, which comprises a daughter board including a power supply load and the power supply delay circuit. The power supply load and the power supply delay circuit form a control loop and are plug- connectable with the power supply and the ground terminal of a mother board. Specifically, the power supply delay circuit comprises the delay circuit 110, a first connection terminal and a second connection terminal, the delay circuit 110 is connected with the first connection terminal and the second connection terminal, the first connection terminal is used for connecting the power supply, and the second connection terminal is used for connecting the power supply or the ground terminal; the delay circuit 110 is used for delaying the turn-on of the power supply, so that the two power supplies are not turned on at the same time, or the power supply is turned on earlier than the ground terminal. The delay circuit 110 is arranged on the power supply load side, the power supply load is connected with the power supply side through a hot plug interface, and the hot plug interface includes a power supply interface and a ground interface. According to actual needs, the first connection terminal of the power supply delay circuit is connected with the power supply interface, and the second connection terminal of the power supply delay circuit is connected with the ground interface or another power supply interface. During the hot plug process, the delay circuit 110 delays the turn-on of the power supply, avoids the simultaneous turn-on of the two power supplies, or makes the power supply turned on earlier than the ground terminal, thereby preventing mutual interference between the multiple power supplies, ensuring the turn-on sequence of the power supply during the hot plug, and thus playing a role in protecting the circuit. When avoiding the simultaneous turn-on of the two power supplies, the delay circuit 110 can delay the turn-on of one of the power supplies, for example, the turn-on of the power supply with a high output voltage; or the delay circuit 110 can delay the turn-on of both of the power supplies, and the different delay times are used to avoid the simultaneous turn-on of the two power supplies.

[0034] As shown in FIG. 1, Figure 1 The delay circuit 110 includes a switch tube, a first resistance component, a second resistance component and a capacitor component. The first end of the switch tube is connected with the first connection terminal, the second end of the switch tube is connected with the second connection terminal through the power supply load, the control end of the switch tube is connected with one end of the first resistance component and one end of the second resistance component, the other end of the first resistance component is connected with the first end of the switch tube, the other end of the second resistance component is connected with the second connection terminal, and the capacitor component is connected with the second resistance component in parallel. The switch tube is an N-channel MOS tube, the first resistance component is a resistor R1, and the second resistance component is a resistor R2. The capacitor component plays a role in charging and delaying, and the switch tube is turned on after the capacitor is charged to a turn-on voltage. Specifically, the capacitor component is a patch capacitor C1, and the patch capacitor C1 is connected with the resistor R2 in parallel.

[0035] Further, as shown in FIG. 2, Figure 2As shown, the delay circuit 110 can be located between the ground terminal GND and the power supply, or between two power supplies. The best conduction sequence is that the ground terminal GND is conducted first, followed by the power supply 3, the power supply 2, and the power supply 1. A delay circuit 110 can be arranged between the power supply 1, the power supply 2, the power supply 3, and the ground terminal GND. In a system with three power supplies and ground, the delay circuit 110 is located between each power supply, ensuring that the ground terminal GND is conducted first, followed by the power supply 3 after a delay, the power supply 2 after the power supply 3, and the power supply 1 after the power supply 2. This effectively avoids interference between multiple power supplies and controls the conduction sequence of the power supplies.

[0036] It should be noted that the conduction sequence between each power supply and the ground terminal GND is not fixed and can be selected according to different circuit path conditions. For example, if the power supply 2 needs to be conducted before the power supply 3, a delay circuit is added to the path between the power supply 3 and the power supply 2 to ensure that the power supply 2 is conducted first, followed by the power supply 3. Alternatively, if the ground terminal GND needs to be conducted before the power supply 1, a delay circuit is added to the path between the power supply 1 and the ground terminal GND to ensure that the ground terminal GND is conducted first, followed by the power supply 1.

[0037] In one embodiment, as shown in Figure 3 The hot plug device further includes a motherboard and an inter-board connection line, and the motherboard is connected to the daughter board through the inter-board connection line. The inter-board connection line includes a daughter board line W2, a daughter end, a mother end, and a motherboard line W1. The daughter end is connected to the daughter board through the daughter board line W2. The mother end is matched with the daughter end and connected to the motherboard through the motherboard line W1. Further, the motherboard is provided with a power supply and a ground terminal, and the power supply and the ground terminal are connected to the daughter board through the inter-board connection line.

[0038] The motherboard can be provided with only one power supply or multiple power supplies. According to actual needs, a corresponding number of delay circuits 110 are arranged on the daughter board to delay the conduction of the power supply. In one embodiment, the number of power supplies is two or more, and the power supply load of the daughter board can be powered by multiple power supplies on the motherboard. The output voltages of the power supplies can be completely the same, completely different, or partially the same. In this embodiment, the output voltages of the power supplies are different from each other. By arranging power supplies with different output voltages, different power supply requirements of the power supply load can be met.

[0039] Specifically, the mother end and the daughter end support the hot plug function, and the motherboard is provided with a power supply and a ground terminal. After the mother end and the daughter end are connected, the power supply load on the daughter board forms a path with the power supply and the ground terminal on the motherboard through the inter-board connection line. Depending on the number and type of power supplies on the motherboard, the interface of the mother end and the daughter end will also be different. For example, if the power supplies on the motherboard include +24V power supply and +5V power supply, the mother end and the daughter end are provided with +24V interface, +5V interface, and GND interface.

[0040] The hot plug device, a delay circuit 110 is arranged between the power supply and the power supply, or between the power supply and the ground terminal, so that the two power supplies are not turned on at the same time, or the power supply is turned on earlier than the ground terminal, avoiding mutual interference between the power supplies, and improving the use reliability.

[0041] In order to better understand the above-mentioned power supply delay circuit and hot plug device, the following will be explained in detail in combination with specific embodiments.

[0042] In a multi-power supply circuit, hot plug can cause mutual interference between power supplies, and the delay circuit provided by the application can solve this problem. The circuit uses fewer devices to delay the turn-on of the power supply. It can be applied in sensitive circuits, and ensures the turn-on sequence of the power supply during hot plug, thereby playing a role in protecting the circuit.

[0043] System principle explanation: the delay circuit is used in a multi-power supply circuit, as shown in Figure 2 , three power supplies and ground systems are listed. The delay circuit is located between each power supply, which ensures that the power supply 3 is turned on after a delay time after the ground terminal GND is turned on, the power supply 2 is turned on after the power supply 3, and the power supply 1 is turned on after the power supply 2. This effectively avoids interference between multiple power supplies and controls the turn-on sequence of the power supply.

[0044] The delay circuit can be located between the ground terminal GND and the power supply, or between two power supplies. The best turn-on sequence is that the ground terminal GND is turned on before the power supply 3, the power supply 3 is turned on before the power supply 2, and the power supply 2 is turned on before the power supply 1. According to different circuit path conditions, the turn-on sequence is selected, for example, if the power supply 2 needs to be turned on before the power supply 3, the delay circuit is added to the path between the power supply 3 and the power supply 2, which ensures that the power supply 2 is turned on first and then the power supply 3 is turned on. Or, if the ground terminal GND needs to be turned on before the power supply 1, the delay circuit is added to the path between the power supply 1 and the ground terminal GND, which ensures that the ground terminal GND is turned on first and then the power supply 1 is turned on.

[0045] As shown in Figure 1 , the delay circuit 110 includes a MOS tube, two resistors, and a capacitor. The MOS tube is a common N-channel MOS tube, which functions as a switch here and needs to reach the turn-on voltage before being turned on. R1 and R2 are the same resistance, which functions as voltage division here to ensure that the voltage reaches the turn-on voltage of the MOS tube. The capacitor C1 functions as a charging delay here, and the MOS tube is turned on when the charging voltage of the capacitor reaches the turn-on voltage of the MOS tube. It can be understood that in other embodiments, the MOS tube can be replaced by one or two triodes, which can also realize the function of the delay circuit 110.

[0046] The following lists a 24V DC power supply, a 5V DC power supply, and a ground terminal GND control circuit in a sensitive circuit, which will be described in detail:

[0047] As shown in Figure 4 The whole system is divided into three parts: daughter board, mother board and inter-board connection. The mother board provides 24V / 5V power supply and ground, and connects to the daughter board through the inter-board connection. The delay circuit 110 is located in the daughter board and needs to pass through the delay circuit 110 when the 24V power supply of the mother board is connected to the daughter board.

[0048] Specifically, the mother board part: V1 is the 24V DC power supply provided by the mother board to the daughter board, V2 is the 5V DC power supply provided by the mother board to the daughter board, GND is the ground network provided by the circuit, R4 is the 5V power supply load of the mother board, C3 is the 5V power supply emission end filter capacitor of the mother board, and R3 is the 5V power supply emission end filter resistor of the mother board.

[0049] Inter-board connection: K1 is equivalent to the connection of the mother end and the daughter end 24V in the inter-board connection, K2 is equivalent to the connection of the mother end and the daughter end 5V in the inter-board connection, and K3 is equivalent to the connection of the mother end and the daughter end GND in the inter-board connection.

[0050] Daughter board: D1 is the internal parasitic diode of the daughter board chip, which can be turned on when the 24V power supply is connected. C4 is the 5V power supply entering end filter capacitor of the daughter board, R5 is the 24V power supply entering end filter resistor of the daughter board, and C2 is the 24V power supply entering end filter capacitor of the daughter board.

[0051] Delay circuit 110: MOS is a MOS tube, a voltage-controlled device that turns on only when the voltage reaches the turn-on voltage, acting as a switch. R1 is a normal resistor that makes the MOS tube reach the turn-on voltage, R2 is a resistor with the same resistance as R1, which makes the MOS tube reach the turn-on voltage, and C1 is a normal SMD capacitor that acts as a charging delay. The capacitor charges to the MOS turn-on voltage.

[0052] Circuit operation principle: The delay circuit 110 is added to the daughter board port. When the 24V power supply reaches the daughter board through the terminal, it first passes through the delay circuit 110. The delay circuit 110 includes a MOS tube, two resistors R1 and R2 with the same resistance, and a capacitor C1. When 24V passes through the MOS tube, it needs to pass through the capacitor C1 charging time before the 24V power supply is turned on. At this time, the delay time is t, which can be calculated according to the following capacitor charging formula.

[0053]

[0054] Where U is the charging voltage across capacitor C1, U0 is the 24V power supply voltage, e is the constant e, R is the parallel resistance of resistor R1 and resistor R2, C is the capacitance of capacitor C1, and t is the charging time t. The time t needs to be greater than the difference between the conduction time of K1, K2 and K3 (the conduction time of K1, K2 and K3 is less than 40ms according to experimental verification).

[0055] When the delay circuit 110 is not present, hot plug causes the K1, K2, K3 to turn on in sequence. If the 24V power supply turns on before the 5V power supply, and the 5V power supply turns on before the ground GND (K1 is closed, then K2 is closed, and K3 is closed last), the current path of the 24V power supply is V1→K1→R5→D1→K2→R3→GND. At this time, the diode D1 is subjected to a high voltage impact in an instant, and will be damaged.

[0056] In this example, the delay circuit 110 is added to ensure that the ground and the 5V power supply turn on before the 24V power supply (K2 and K3 are closed first, and then the 24V power supply is turned on). Under this condition, no matter how, the high voltage 24V power supply will not pass through the diode D1. The following is an analysis of the different sequences of ground turn-on during hot plug:

[0057] At the moment of connection, if the ground GND is not turned on and the 24V power supply turns on before the 5V power supply (K1 and K2 are closed, and K3 is open), the current passes through the MOS tube after a delay t (the MOS tube turn-on time = the charging time of the capacitor C1). During the t time, the hot plug action is completed, the ground GND is turned on (K3 is closed) or the 5V power supply is turned on (K2 is closed), and the high voltage of the 24V power supply will not affect the circuit.

[0058] The above power supply delay circuit has a delay effect on the power supply turn-on, prevents mutual interference between multiple power supplies, and can be widely used in multiple power supply circuits to protect the power supply and sensitive circuits at a low cost. The power supply delay circuit solves the influence of hot plug on the power supply, and also solves the influence of hot plug on sensitive circuits.

[0059] In the description of the present specification, the description of the terms "some embodiments", "other embodiments", "ideal embodiments", and the like means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0060] Each technical feature of the above-described embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present specification.

[0061] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific and detailed manner, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are all within the scope of the present application. Therefore, the scope of protection of the patent of the present application should be subject to the appended claims.

Claims

1. A hot plug device, characterized by The board includes a daughter board, a mother board and an inter-board connection line, the mother board is connected with the daughter board through the inter-board connection line, the mother board is provided with a power supply and a grounding terminal, the power supply includes at least a first power supply and a second power supply; the daughter board includes a power supply load and a power supply delay circuit; The power supply delay circuit includes: a delay circuit, a first connection terminal and a second connection terminal, the delay circuit connects the first connection terminal and the second connection terminal, the first connection terminal is used for connecting the first power supply, and the second connection terminal is used for connecting the grounding terminal; The delay circuit also connects the power supply load, the power supply load forms a passage with the first power supply and the grounding terminal on the mother board through the inter-board connection line; the delay circuit is used for delaying the conduction of the first power supply, so that the first power supply is delayed to be conducted with the grounding terminal.

2. The hot plug device of claim 1, wherein, The inter-board connection line includes a daughter board line, a daughter terminal, a mother terminal and a mother board line, the daughter terminal is connected with the daughter board through the daughter board line, the mother terminal is matched with the daughter terminal and is connected with the mother board through the mother board line; after the mother terminal is connected with the daughter terminal, the power supply load on the daughter board forms a passage with the first power supply and the grounding terminal on the mother board through the inter-board connection line.

3. The hot plug device of claim 1, wherein, The output voltages of the first power supply and the second power supply are different from each other.

4. The hot plug apparatus of claim 1, wherein, The delay circuit includes a switch tube, a first resistance component, a second resistance component and a capacitor component, a first end of the switch tube is connected with the first connection terminal, a second end of the switch tube is connected with the second connection terminal through the power supply load, a control end of the switch tube is connected with one end of the first resistance component and one end of the second resistance component, the other end of the first resistance component is connected with the first end of the switch tube, the other end of the second resistance component is connected with the second connection terminal, and the capacitor component is connected with the second resistance component in parallel.

5. The hot plug device of claim 4, wherein, The switch tube is a MOS tube.

6. The hot plug apparatus of claim 4, wherein, The switch tube is a triode.

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