Hot plug protection circuit

Abstract

The utility model discloses a hot plug protection circuit. The circuit comprises an input interface; the first switch is connected with the input interface and forms a first connection point; the control module is respectively connected with the first connection point and the first switch; the output interface is connected with the first switch; in the conduction stage of the hot plug protection circuit, when it is detected that the input current of the input interface is smaller than the threshold current, the control module directly controls the first switch to be switched on, and when it is detected that the input current of the input interface is larger than or equal to the threshold current, the control module directly controls the second switch to be switched off. The control module controls the first switch to be switched on after a first time. According to the embodiment of the invention, the function of high-voltage hot plug protection can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to a hot-swap protection circuit. Background Art

[0002] As the power of equipment increases, the demand for high voltage will also increase, and the demand for hot plug / short circuit protection will also increase. The current common surge / short circuit protection chips are limited by semiconductor technology, and the working voltage is within 80V. In the actual design process, when there is a voltage higher than 80V or higher than 80V, the surge / short circuit protection chip cannot meet the design requirements and cannot achieve short circuit protection. Utility Model Content

[0003] The embodiment of the present application provides a hot-swap protection circuit, which can solve the technical problem that the surge / short-circuit protection chip has a low working withstand voltage and cannot achieve short-circuit protection when there is a higher input voltage.

[0004] To solve the above technical problems, the present application provides the following technical solutions:

[0005] The present application provides a hot-swap protection circuit, comprising:

[0006] Input interface;

[0007] A first switch connected to the input interface to form a first connection point;

[0008] a control module, connected to the first connection point and the first switch respectively;

[0009] an output interface connected to the first switch;

[0010] Among them, in the conduction stage of the hot-swap protection circuit, when it is detected that the input current of the input interface is less than the threshold current, the control module directly controls the first switch to be turned on, and when it is detected that the input current of the input interface is greater than or equal to the threshold current, the control module controls the first switch to be turned on after the first time.

[0011] Further, as in the above hot-swap protection circuit, the hot-swap protection circuit further includes a sampling module;

[0012] One end of the sampling module is connected to the input interface to form the first connection point; the other end of the sampling module is connected to the first switch to form a second connection point; the control module is respectively connected to the sampling module and the first connection point, or the control module is respectively connected to the first connection point and the second connection point.

[0013] Further, as in the above-mentioned hot-swap protection circuit, the sampling module includes a sampling resistor, a first end of the sampling resistor is respectively connected to the first connection point and the first port of the control module, and a second end of the sampling resistor is respectively connected to the second connection point and the second port of the control module.

[0014] Further, as in the above hot-swap protection circuit, the control module includes:

[0015] A controller, wherein a first port of the controller is connected to the first connection point, and a second port of the controller is connected to the sampling module, or, the first port of the controller is connected to the first connection point, and the second port of the controller is connected to the second connection point;

[0016] a driving module, one end of which is connected to the third port of the controller, and the other end of which is grounded;

[0017] A boost module, one end of the boost module is connected to the fifth port of the controller, and the other end of the boost module is connected to the sixth port of the controller.

[0018] Further, as in the above hot-swap protection circuit, wherein the first switch includes a first end, a second end and a third end;

[0019] The first end of the first switch is connected to the third port of the controller and the fourth port of the controller respectively;

[0020] The second end of the first switch is connected to the second connection point;

[0021] The third end of the first switch is connected to the fifth end of the controller and the sixth end of the controller respectively;

[0022] The fifth port and the sixth port of the controller provide a first voltage to the third end of the first switch through the boost module;

[0023] In the conduction phase of the hot-swap protection circuit, when it is detected that the input current of the input interface is greater than or equal to the threshold current, the third port of the controller drives the first switch to be turned on through the driving module;

[0024] In the disconnection stage of the hot-swap protection circuit, the fourth terminal of the controller provides a first voltage to the first terminal of the first switch, and the first switch is disconnected.

[0025] Further, as in the above hot-swap protection circuit, the hot-swap protection circuit further includes a reset module, and the reset module is connected to the control module;

[0026] In the disconnection stage of the hot-swap protection circuit, the control module controls the first switch to be temporarily disconnected, the control module sends a first control signal to the reset module, and the reset module sends a reset signal to the control module according to the first control signal to reset the control module.

[0027] Further, as in the above hot-swap protection circuit, wherein the reset module includes an input end and an output end, the control module includes a controller, the controller includes a seventh port and an eighth port, the input end of the reset module is connected to the seventh port, and the output end of the reset module is connected to the eighth port;

[0028] In the disconnection stage of the hot-swap protection circuit, the control module controls the first switch to be temporarily disconnected, and when the eighth port of the controller suddenly changes from a low level to a high level, the controller restarts.

[0029] Further, as in the above hot-swap protection circuit, wherein the ninth port of the controller is connected to a first power supply, and the first power supply provides a regulated power supply for the controller;

[0030] The eighth port of the controller is connected to the first power supply, and in the conduction stage of the hot-swap protection circuit, when it is detected that the input current of the input interface is greater than or equal to the threshold current, the seventh port of the controller is configured as an open-drain output mode, and at this time, a high level is provided to the seventh port of the controller through the first power supply;

[0031] The first power supply is also connected to the reset module.

[0032] Further, as in the above hot-swap protection circuit, the reset module includes:

[0033] A first delay module connected to the seventh port of the controller;

[0034] A second switch connected to the first delay module;

[0035] a second delay module connected to the second switch to form a third connection point, and an output end of the second delay module connected to the eighth port of the controller;

[0036] Among them, in the disconnection stage of the hot-swap protection circuit, the control module controls the first switch to be temporarily disconnected, the seventh port of the controller outputs a high-level signal, controls the second switch to be turned on, so that the third connection point outputs a low level, and at the same time the output end of the second delay module is a low level. Under the action of the first power supply, the eighth port of the controller returns to a high level after the second time to restart the controller.

[0037] Further, as in the above hot-swap protection circuit, wherein the second delay module comprises:

[0038] a fifth capacitor, wherein a first end of the fifth capacitor is connected to the third connection point, and the other end of the fifth capacitor is connected to the eighth port of the controller;

[0039] a tenth resistor, wherein a first end of the tenth resistor is connected to the first end of the fifth capacitor, and a second end of the tenth resistor is connected to the first power supply;

[0040] an eleventh resistor, a first end of the eleventh resistor being connected to the first end of the fifth capacitor, and a second end of the eleventh resistor being grounded;

[0041] a twelfth resistor, wherein a first end of the twelfth resistor is connected to the second end of the fifth capacitor, and a second end of the tenth resistor is connected to the first power supply;

[0042] a thirteenth resistor, a first end of the thirteenth resistor being connected to the second end of the fifth capacitor, and a second end of the thirteenth resistor being grounded;

[0043] The tenth resistor, the twelfth resistor, the eleventh resistor, and the thirteenth resistor ensure that the voltage values ​​across the fifth capacitor are all zero at the moment the second switch is turned on.

[0044] The hot-swap protection circuit and battery management system provided in the present application are configured with a control module and a first switch. When the voltage / current value input to the input port is too high, the control module delays the turning on of the first switch, and turns on the first switch after the voltage input to the input port stabilizes, that is, after the surge current disappears, thereby realizing the function of high-voltage hot-swap protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0046] Figure 1 This is one of the structural schematic diagrams of a hot-swap protection circuit provided in an embodiment of the present application.

[0047] Figure 2 The present invention provides a second schematic diagram of a circuit structure of a hot-swap protection circuit provided in an embodiment of the present application.

[0048] Figure 3 The third circuit structure schematic diagram of a hot-swap protection circuit provided in an embodiment of the present application.

[0049] Figure 4 A fourth circuit structure diagram of a hot-swap protection circuit provided in an embodiment of the present application.

[0050] Figure 5 The fifth circuit structure diagram of a hot-swap protection circuit provided in an embodiment of the present application.

[0051] Figure 6 This is one of the timing diagrams of the hot-swap protection circuit provided in an embodiment of the present application.

[0052] Figure 7 A second timing diagram of the hot-swap protection circuit provided in an embodiment of the present application.

[0053] Reference numerals:

[0054] 1. First switch; 2. Control module; 21. Drive module; 22. Boost module; 3. Sampling module; 4. Reset module; 41. First delay module; 42. Second switch; 43. Second delay module; 5. Energy storage module. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0056] The present application embodiment provides a hot-swap protection circuit. Figure 1 One of the structural schematic diagrams of a hot-swap protection circuit provided in an embodiment of the present application is as follows: Figure 1 As shown, it includes an input interface VIN, a first switch 1, a control module 2 and an output interface VOUT; the first switch 1 is connected to the input interface XIN to form a first connection point A, and the output interface VOUT is connected to the first switch 1. In the conduction stage of the hot-swap protection circuit, when it is detected that the input current of the input interface VIN is less than the threshold current, the control module 2 directly controls the first switch 1 to be turned on, and when it is detected that the input current of the input interface VIN is greater than or equal to the threshold current, the control module 2 controls the first switch 1 to be turned on after a first time.

[0057] In one embodiment, if Figure 2 Show, Figure 2 The second structural diagram of a hot-swap protection circuit provided in an embodiment of the present application, the hot-swap protection circuit may further include a sampling module 3, one end of the sampling module 3 is connected to the input interface VIN, and forms a first connection point A; the other end of the sampling module 3 is connected to the first switch 1, and forms a second connection point B; the control module 2 is respectively connected to the sampling module 3 and the first connection point A ( Figure 2Not shown), or the control module is connected to the first connection point A and the second connection point B (corresponding to Figure 2 ).

[0058] In one embodiment, the sampling module 3 may include a sampling resistor R1, wherein a first end of the sampling resistor R1 is respectively connected to a first connection point A and a first port of the control module 2, and a second end of the sampling resistor R1 is respectively connected to a second connection point B and a second port of the control module 2. The resistance value of the sampling resistor R1 may be 2 mΩ.

[0059] In another embodiment, the sampling module 3 may also be a sliding rheostat. In this case, the control module 2 is connected to the metal rod and the first connection point A of the sliding rheostat respectively.

[0060] In one embodiment, if Figure 3 As shown, Figure 3 A third structural diagram of a hot-swap protection circuit provided in an embodiment of the present application, the control module 2 includes a controller U1, a drive module 21 and a boost module 22, the first port SNS+ of the controller U1 is connected to the first connection point A, and the second port SNS- of the controller U1 is connected to the sampling module 3, or the first port SNS+ of the controller U1 is connected to the first connection point A, and the second port SNS- of the controller U1 is connected to the second connection point B. Among them, the controller U1 is connected to the sampling resistor R1, and the input current of the input interface VIN is collected through the sampling resistor R1. When the first port SNS+ of the controller U1 is connected to the first connection point A, and the second port SNS- of the controller U1 is connected to the second connection point B, a resistor R2 is also connected between the second connection point B and the second port SNS- of the controller U1. The resistor R2 is used to filter the collected input current, and the resistance value of the resistor R2 can be 100Ω.

[0061] One end of the driving module 21 is connected to the third port TGUP of the controller U1, and the other end of the driving module 21 is grounded. Specifically, the driving module 21 may include a third resistor R3, a fourth resistor R4 and a first capacitor C1, a first end of the third resistor R3 is connected to the third port TGUP of the controller U1, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded. The resistance value of the resistor R3 may be 100 kΩ, the resistance value of the resistor R4 may be 10Ω, and the capacitance value of the capacitor C1 may be 0.01 uF.

[0062] One end of the boost module 22 is connected to the fifth port TS of the controller U1, and the other end of the boost module 22 is connected to the sixth port BST of the controller U1. Specifically, the boost module 22 may include a second capacitor C2, one end of the second capacitor C2 is connected to the fifth port TS of the controller U1, and the other end of the second capacitor C2 is connected to the sixth port BST of the controller U1. The capacitance value of the second capacitor may be 0.1uF.

[0063] In one embodiment, the first switch 1 may be a MOS transistor Q1, the first end of the first switch 1 corresponds to the gate of the MOS transistor, the second end of the first switch 1 corresponds to the drain of the MOS transistor, and the third end of the first switch 1 corresponds to the source of the MOS transistor.

[0064] Specifically, the first end of the first switch 1 is connected to the third port TGUP of the controller U1 and the fourth port TGDN of the controller U1, respectively. The first end of the first switch 1 is connected to the third port TGUP of the controller U1, which means that the first end of the first switch 1 is to be connected to the common end of the third resistor R3 and the fourth resistor R4, and the third port TGUP of the controller U1 is also connected to the common end of the third resistor R3 and the fourth resistor R4. The second end of the first switch 1 is connected to the second connection point B. The third end of the first switch 1 is connected to the fifth port TS of the controller U1 and the sixth port TS of the controller U1, respectively. That is, the third end of the first switch 1 is connected to the common end of the second capacitor C2 and the fifth port TS of the controller U1. Among them, the resistance value of the third resistor R3 can be 100KΩ, the resistance value of the fourth resistor R4 can be 100Ω, and the capacitance value of the second capacitor C2 can be 0.01uF.

[0065] Among them, the fifth port TS and the sixth port BST of the controller U1 provide a first voltage to the third end of the first switch 1 through the boost module 22. In the on-stage of the hot-swap protection circuit, when it is detected that the input current of the input interface VIN is greater than or equal to the threshold current, the third end of the controller drives the first switch 1 to be turned on through the driving module 21. In the off-stage of the hot-swap protection circuit, the fourth port TGDN of the controller U1 provides a first voltage to the first end of the first switch 1. At this time, the voltage value of the first end of the first switch 1 is the same as that of the third end, that is, there is no potential difference between the gate and the source of the MOS tube Q1, and the MOS tube Q1 is disconnected, that is, the first switch 1 is disconnected.

[0066] In one embodiment, a fifth resistor R5 is connected between the gate and source of the MOS transistor Q1, and the fifth resistor R5 is a state resistor. When the MOS transistor Q1 is turned on, the fifth resistor R5 is used to maintain the voltage value between the gate and source of the MOS transistor Q1 in a stable state. The resistance value of the fifth resistor R5 can be 510 kΩ.

[0067] The driving module 21 can control the opening speed of the first switch 1 by adjusting the resistance values ​​of the third resistor R3 , the fourth resistor R4 , and the first capacitor C1 to achieve control of the connection speed of the first switch 1 .

[0068] Specifically, the ninth port VCC of the controller U1 is also connected to the third capacitor C3 and the first power supply VCC1, the first end of the third capacitor C3 is connected to the common end of the first power supply VCC1 and the ninth port VCC of the controller U1, and the second end of the third capacitor C3 is grounded. The capacitance value of the third capacitor C3 can be 2.2uF.

[0069] Specifically, the controller U1 further includes a VCCUV port, a sixth resistor R6 is connected to the VCCUC port, one end of the sixth resistor R6 is connected to the VCCUC port, and the other end of the sixth resistor R6 is grounded. The controller U1 further includes a TIMER port, and the TIMER port is connected to the first power supply VCC1. The controller U1 further includes a GND port, and the GND port is grounded. The voltage value of VCC1 is less than the voltage value input by the input port, for example, VCC1 can be 10V, and the sixth resistor R6 can be 110kΩ.

[0070] In one embodiment, the controller may be a high-voltage switch chip, the model of which may be LTC7000EMSE-1#TRPBF. The high-voltage switch chip may withstand a voltage of 3.5V-135V. The above-mentioned embodiment of the present application may realize a high-voltage hot-swap protection function.

[0071] In one embodiment, if Figure 4 and Figure 5 As shown, Figure 4 A fourth structural diagram of a hot-swap protection circuit provided in an embodiment of the present application is shown in FIG. Figure 5 The fifth structural diagram of a hot-swap protection circuit provided in an embodiment of the present application, the hot-swap protection circuit may further include a reset module 4, the input end of the reset module 4 is connected to the seventh port FAULT of the controller U1, and the output end of the reset module 4 is connected to the eighth port INP of the controller U1.

[0072] In the disconnection stage of the hot-swap protection circuit, the control module 2 controls the first switch 1 to be temporarily disconnected, and when the eighth port INP of the controller U1 suddenly changes from a low level to a high level, the controller U1 restarts.

[0073] Specifically, the ninth port VCC of the controller U1 is connected to the first power supply VCC1, and the first power supply VCC1 provides a regulated power supply for the controller U1. The eighth port INP of the controller U1 is connected to the first power supply VCC1. In the conduction phase of the hot-swap protection circuit, when it is detected that the input current of the input interface VIN is greater than or equal to the threshold current, the seventh port FAULT of the controller U1 is configured as an open drain output (OpenDrain) mode, and at this time, a high level is provided for the seventh port FAULT of the controller through the first power supply VCC1. The first power supply VCC1 is also connected to the reset module 4. Among them, the seventh port FAULT of the controller U1 is also connected to the seventh resistor R7, one end of the seventh resistor R7 is connected to the seventh port FAULT of the controller U1, and the other end of the seventh resistor R7 is connected to the first power supply VCC1. The seventh resistor R7 is a pull-up resistor. In the open drain output mode, the seventh port FAULT of the controller U1 is raised to a high level through the pull-up resistor. Among them, the resistance value of the seventh resistor R7 can be 510kΩ.

[0074] In one embodiment, the reset module 4 includes a first delay module 41, a second switch 42, and a second delay module 43. The first delay module 41 is connected to the seventh port FAULT of the controller U1, the second switch 42 is connected to the first delay module 41, and the second delay module 43 is connected to the second switch 42 to form a third connection point C. The output end of the second delay module 43 is connected to the eighth port INP of the controller U1.

[0075] Among them, in the disconnection stage of the hot plug protection circuit, the control module 2 controls the first switch 1 to be temporarily disconnected, and the seventh port FAULT of the controller U1 outputs a high level signal, controls the second switch 42 to be turned on, so that the third connection point C outputs a low level, and at the same time the output end of the second delay module 43 is a low level. Under the action of the first power supply VCC1, the eighth port INP of the controller U1 returns to a high level after the second time to restart the controller U1.

[0076] Specifically, the first delay module 41 includes an eighth resistor R8 and a fourth capacitor C4, a first end of the eighth resistor R8 is connected to the seventh port FAULT of the controller U1, a second end of the eighth resistor R8 is connected to the first end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded. The resistance value of the eighth resistor R8 can be 200 kΩ, and the capacitance value of the fourth capacitor C4 can be 1 uF.

[0077] The second switch 42 includes a MOS transistor Q2 and a ninth resistor R9, wherein the gate of the MOS transistor Q2 is connected to the common end of the eighth resistor R8 and the fourth capacitor C4, the source of the MOS transistor Q2 is grounded, the drain of the MOS transistor Q2 is connected to the third connection point C, and a ninth resistor R9 is further connected between the gate and the source of the MOS transistor Q2. When the MOS transistor Q2 is turned on, the ninth resistor R9 is used to stabilize the voltage between the gate and the source of the MOS transistor Q2. The resistance value of the ninth resistor R9 may be 510 kΩ.

[0078] The second delay module 43 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and an eighth capacitor C8. The first end of the tenth resistor R10 is connected to the first end of the fifth capacitor C5, and the second end of the tenth resistor R10 is connected to the first power supply VCC1; the first end of the eleventh resistor R11 is connected to the first end of the fifth capacitor C5, and the second end of the eleventh resistor R11 is grounded; the first end of the twelfth resistor R12 is connected to the second end of the fifth capacitor C5, and the second end of the tenth resistor R10 is connected to the first power supply VCC1; the first end of the thirteenth resistor R13 is connected to the second end of the fifth capacitor C5, and the second end of the thirteenth resistor R13 is grounded. Among them, the resistance values ​​of the tenth resistor R10 and the twelfth resistor R12 can be 510kΩ, and the resistance values ​​of the eleventh resistor R11 and the thirteenth resistor R13 can be 200kΩ.

[0079] In the disconnection stage of the hot-swap protection circuit, when the seventh port FAULT of the controller U1 outputs a high-level signal, the MOS tube Q2 is turned on under the delay effect of the first delay module 41. Since the source of the MOS tube Q2 is grounded, after the MOS tube Q2 is turned on, the gate voltage of the MOS tube Q2 is also 0, that is, the voltage VRST of the third connection point is 0. Since the voltage across the capacitor cannot change suddenly, the voltage VINP of the second end of the fifth capacitor C5 is also 0 at this time, that is, the eighth port INP of the controller U1 outputs a low level for a period of time after the MOS tube Q2 is turned on. The first power supply VCC1 will charge the fifth capacitor C5 later. Under the action of the first power supply VCC1, after the second time, the second end of the fifth capacitor C5 will become a high level, that is, the eighth port INP of the controller U1 will become a high level. When the eighth port INP of the controller U1 changes suddenly from a low level to a high level, the controller U1 restarts. Among them, the restart time of the controller U1 can be adjusted by controlling the capacitance value of the fifth capacitor C5, that is, adjusting the second time to reduce the stress of the MOS tube Q1.

[0080] In one embodiment, the hot-swap protection circuit may further include an energy storage module 5 , one end of the energy storage module 5 is connected to the output interface VOUT, and the other end of the energy storage module 5 is grounded.

[0081] In one embodiment, the energy storage module 5 may include a plurality of energy storage capacitors connected in parallel, for example, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8 connected in parallel between the output interface VOUT and the ground terminal. The energy storage module 5 may provide electrical energy to a load connected to the output interface VOUT temporarily when the first switch 1 is disconnected during the restart phase of the controller U1. The capacitance values ​​of the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 may be 100uF.

[0082] The embodiment of the present application sets a reset module 4 to restart the controller, and does not require an external control chip to provide a reset signal to the controller, and can achieve automatic restart. In addition, the controller automatically restarts after the first hot plug protection is implemented, and can achieve subsequent short circuit protection functions.

[0083] The following is a brief introduction to the working process of the hot swap protection circuit provided by this application:

[0084] During the hot-swap protection phase:

[0085] When the input interface VIN is connected to the power supply, a surge current (for example, 100V, 10A) will be generated. At this time, the controller U1 collects the current I1 input by the input interface VIN through the sampling module 3, and compares it through the comparator inside the controller U1 to determine that the input current I1 is greater than the threshold current. At this time, the controller U1 controls the first switch 1 to be turned on after the first time, that is, after the surge current disappears, the first switch 1 is turned on when the input current is stable.

[0086] When it is determined that the input current I1 is greater than the threshold current, the controller U1 is restarted through the seventh port FAULT of the controller U1, the reset module 4, and the eighth port INP of the controller U1. During the process of restarting the controller U1, the first switch 1 is disconnected, and the energy storage module 5 briefly provides power to the load connected to the output interface VOUT.

[0087] In the short circuit protection stage, Figure 6 One of the timing diagrams of the hot-swap protection circuit provided in the embodiment of the present application, Figure 7 The second timing diagram of the hot-swap protection circuit provided in the embodiment of the present application is as follows: Figure 6 Shown with Figure 7As shown, the voltage input to the input port VIN between 0S and 0.6S is a normal value (normal value means that the load can work normally under this voltage and will not be damaged). Correspondingly, the voltage output by the output interface VOUT between 0S and 0.6S is also a normal value (V[OUT]=VIN). A short circuit occurs at 0.6S, and the short-circuit voltage V[short] at this time is very large. The controller U1 collects the current I2 input to the input interface VIN through the sampling module 3, and compares it through the comparator inside the controller U1 to determine that the input current I2 is greater than the threshold current. At this time, the voltage V[fault] of the seventh port FAULT of the controller U1 changes from a low level to a high level. After the second switch 42 is turned on, the voltage V[inp] of the eighth port INP of the controller U1 changes from a high level to a low level, and the first power supply VCC1 charges the eighth capacitor C8. After the second time, V[inp] changes from a low level to a high level, and the controller U1 is restarted, and the first switch 1 is turned on again. At this time, V[OUT] gradually increases from 0 to 80V.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0089] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0090] In the present utility model, unless otherwise clearly specified or limited in the embodiments, the terms "install", "connect", "connect" and "fix" etc. appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific implementation situation.

[0091] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hot-swap protection circuit, characterized in that: include: Input interface; A first switch connected to the input interface to form a first connection point; a control module, connected to the first connection point and the first switch respectively; an output interface connected to the first switch; Among them, in the conduction stage of the hot-swap protection circuit, when it is detected that the input current of the input interface is less than the threshold current, the control module directly controls the first switch to be turned on, and when it is detected that the input current of the input interface is greater than or equal to the threshold current, the control module controls the first switch to be turned on after the first time.

2. The hot-swap protection circuit according to claim 1, characterized in that: The hot-swap protection circuit also includes a sampling module; One end of the sampling module is connected to the input interface to form the first connection point; the other end of the sampling module is connected to the first switch to form a second connection point; the control module is respectively connected to the sampling module and the first connection point, or the control module is respectively connected to the first connection point and the second connection point.

3. The hot-swap protection circuit according to claim 2, characterized in that: The sampling module includes a sampling resistor, a first end of the sampling resistor is respectively connected to the first connection point and the first port of the control module, and a second end of the sampling resistor is respectively connected to the second connection point and the second port of the control module.

4. The hot-swap protection circuit according to claim 2, characterized in that: The control module comprises: A controller, wherein a first port of the controller is connected to the first connection point, and a second port of the controller is connected to the sampling module, or, the first port of the controller is connected to the first connection point, and the second port of the controller is connected to the second connection point; a driving module, one end of which is connected to the third port of the controller, and the other end of which is grounded; A boost module, one end of the boost module is connected to the fifth port of the controller, and the other end of the boost module is connected to the sixth port of the controller.

5. The hot-swap protection circuit according to claim 4, characterized in that: The first switch includes a first end, a second end and a third end; The first end of the first switch is connected to the third port of the controller and the fourth port of the controller respectively; The second end of the first switch is connected to the second connection point; The third end of the first switch is connected to the fifth end of the controller and the sixth end of the controller respectively; The fifth port and the sixth port of the controller provide a first voltage to the third end of the first switch through the boost module; In the conduction phase of the hot-swap protection circuit, when it is detected that the input current of the input interface is greater than or equal to the threshold current, the third port of the controller drives the first switch to be turned on through the driving module; In the disconnection stage of the hot-swap protection circuit, the fourth terminal of the controller provides a first voltage to the first terminal of the first switch, and the first switch is disconnected.

6. The hot-swap protection circuit according to claim 1, characterized in that: The hot-swap protection circuit further includes a reset module, and the reset module is connected to the control module; In the disconnection stage of the hot-swap protection circuit, the control module controls the first switch to be temporarily disconnected, the control module sends a first control signal to the reset module, and the reset module sends a reset signal to the control module according to the first control signal to reset the control module.

7. The hot-swap protection circuit according to claim 6, characterized in that: The reset module includes an input end and an output end, the control module includes a controller, the controller includes a seventh port and an eighth port, the input end of the reset module is connected to the seventh port, and the output end of the reset module is connected to the eighth port; In the disconnection stage of the hot-swap protection circuit, the control module controls the first switch to be temporarily disconnected, and when the eighth port of the controller suddenly changes from a low level to a high level, the controller restarts.

8. The hot-swap protection circuit according to claim 7, characterized in that: The ninth port of the controller is connected to a first power supply, and the first power supply provides a regulated power supply for the controller; The eighth port of the controller is connected to the first power supply, and in the conduction stage of the hot-swap protection circuit, when it is detected that the input current of the input interface is greater than or equal to the threshold current, the seventh port of the controller is configured as an open-drain output mode, and at this time, a high level is provided to the seventh port of the controller through the first power supply; The first power supply is also connected to the reset module.

9. The hot-swap protection circuit according to claim 8, characterized in that: The reset module comprises: A first delay module connected to the seventh port of the controller; A second switch connected to the first delay module; a second delay module connected to the second switch to form a third connection point, and an output end of the second delay module connected to the eighth port of the controller; Among them, in the disconnection stage of the hot-swap protection circuit, the control module controls the first switch to be temporarily disconnected, the seventh port of the controller outputs a high-level signal, controls the second switch to be turned on, so that the third connection point outputs a low level, and at the same time the output end of the second delay module is a low level. Under the action of the first power supply, the eighth port of the controller returns to a high level after the second time to restart the controller.

10. The hot-swap protection circuit according to claim 9, characterized in that: The second delay module comprises: a fifth capacitor, wherein a first end of the fifth capacitor is connected to the third connection point, and the other end of the fifth capacitor is connected to the eighth port of the controller; a tenth resistor, wherein a first end of the tenth resistor is connected to the first end of the fifth capacitor, and a second end of the tenth resistor is connected to the first power supply; an eleventh resistor, a first end of the eleventh resistor being connected to the first end of the fifth capacitor, and a second end of the eleventh resistor being grounded; a twelfth resistor, wherein a first end of the twelfth resistor is connected to the second end of the fifth capacitor, and a second end of the tenth resistor is connected to the first power supply; a thirteenth resistor, a first end of the thirteenth resistor being connected to the second end of the fifth capacitor, and a second end of the thirteenth resistor being grounded; The tenth resistor, the twelfth resistor, the eleventh resistor, and the thirteenth resistor ensure that the voltage values ​​across the fifth capacitor are all zero at the moment the second switch is turned on.

11. The hot-swap protection circuit according to claim 1, characterized in that: The hot-swap protection circuit further includes an energy storage module, which is connected to the output interface and includes a plurality of energy storage capacitors connected in parallel.

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