Overcurrent protection circuit, power supply module and electronic device

Abstract

The application discloses a kind of overcurrent protection circuit, power supply module and electronic equipment, it is related to electronic equipment technical field, overcurrent protection circuit includes sampling unit, comparison unit, processing unit and execution unit, comparison unit is configured as: in the case where reference parameter is in abnormal reference range, output first signal, in the case where reference parameter is in normal reference range, output second signal;Processing unit is configured as: in the case where receiving first signal, output first signal, in the case where receiving second signal, if reference parameter is in normal reference range in first preset time period, output second signal;Execution unit is configured as: in the case where receiving first signal, control low dropout linear regulator enable end ground;In the case where receiving second signal, control low dropout linear regulator enable end suspended.Solved how to reduce the problem of load point power converter power-down phenomenon.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment, and in particular to an overcurrent protection circuit, a power supply module and an electronic device. BACKGROUND

[0002] The existing power supply module includes a point-of-load (POL) and a low dropout regulator (LDO). When the output of the low dropout regulator is short-circuited, the output current of the low dropout regulator will increase sharply. This current is usually unpredictable, and the front-stage point-of-load needs to provide a larger current at this time. If the output current of the point-of-load is greater than the overcurrent protection threshold of the point-of-load, the protection mechanism of the point-of-load will be triggered, so that the point-of-load is turned off, thereby causing the power supply of the entire power supply module to be interrupted, and the point-of-load cannot supply power to the first type of load. Therefore, how to reduce the power-off phenomenon of the point-of-load is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0003] The present application provides an overcurrent protection circuit, a power supply module and an electronic device to at least solve the problem of how to reduce the power-off phenomenon of the point-of-load in the related art.

[0004] The present application provides an overcurrent protection circuit, including a sampling unit, a comparison unit, a processing unit and an execution unit. The sampling unit is connected to the output end of the low dropout regulator, and the electronic device sampling unit is configured to obtain the reference parameter of the low dropout regulator of the electronic device. The comparison unit is connected to the electronic device sampling unit, and the electronic device comparison unit is configured to output a first signal when the reference parameter of the electronic device is in an abnormal reference range, and output a second signal when the reference parameter of the electronic device is in a normal reference range. The processing unit is connected to the electronic device comparison unit, and the electronic device processing unit is configured to output the first signal of the electronic device when the first signal of the electronic device is received, and output the second signal of the electronic device when the second signal of the electronic device is received and the reference parameter of the electronic device is in the normal reference range within a first preset time period. The execution unit is connected to the electronic device processing unit and the enable end of the low dropout regulator of the electronic device, and the electronic device execution unit is configured to control the enable end of the low dropout regulator of the electronic device to ground to disable the low dropout regulator of the electronic device when the first signal of the electronic device is received, and control the enable end of the low dropout regulator of the electronic device to be suspended to enable the low dropout regulator of the electronic device when the second signal of the electronic device is received.

[0005] The application further provides a power supply module, comprising: a load point power converter, a low dropout linear regulator, and the overcurrent protection circuit provided in some of the above embodiments, wherein the input end of the low dropout linear regulator is connected to the output end of the load point power converter; and the sampling unit of the overcurrent protection circuit is connected to the output end of the low dropout linear regulator.

[0006] The application further provides an electronic device, comprising: a circuit board and the power supply module provided in some of the above embodiments, wherein the power supply module is arranged on the circuit board.

[0007] According to the application, when the execution unit receives the first signal, the execution unit controls the enable end of the low dropout linear regulator to be grounded, so that the low dropout linear regulator is turned off, so that the output current of the low dropout linear regulator is cut off, so that the phenomenon that the second type of load connected to the low dropout linear regulator is burned out due to excessive current can be reduced, and the load of the load point power converter can be reduced, so that the output current of the load point power converter can be reduced, so that the phenomenon that the first type of load connected to the load point power converter is burned out due to excessive output current of the load point power converter can be reduced. In the case that the low dropout linear regulator is disabled, the fault can be artificially eliminated, and after the fault is eliminated, the reference parameter of the low dropout linear regulator can be within the normal range. At this time, the comparison unit outputs the second signal and transmits it to the processing unit. If the reference parameter is within the normal reference range within the first preset time period, the processing unit outputs the second signal, so that the low dropout linear regulator can be enabled. If the fault is not eliminated, the reference parameter is not completely within the normal range within the first preset time period, therefore, by enabling the processing unit to output the second signal in the case that the second signal is received and the reference parameter is within the normal reference range within the first preset time period, the phenomenon that the low dropout linear regulator is restarted in the case that the fault is not eliminated can be reduced. In addition, the processing unit can restart the low dropout linear regulator in the case that the fault is eliminated, so that the circuit operates normally, which is beneficial to realize automatic power-on of the low dropout linear regulator. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the application, the drawings required in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0009] Figure 1 A structural schematic diagram of a computing device provided in the embodiments of the application;

[0010] Figure 2 A structural schematic diagram of a computing device provided in the embodiments of the application; Figure 1A structural schematic diagram of an electronic device in the application;

[0011] Figure 3 A structural block diagram of a power supply module in the application; Figure 2

[0012] Figure 4 Another structural block diagram of a power supply module provided by an embodiment of the application;

[0013] Figure 5 Another structural block diagram of a power supply module provided by an embodiment of the application;

[0014] Figure 6 Still another structural block diagram of a power supply module provided by an embodiment of the application;

[0015] Figure 7 A circuit diagram of a power supply module in the application; Figure 6

[0016] A structural schematic diagram of a voltage sampling module provided by an embodiment of the application; Figure 8

[0017] A structural schematic diagram of a voltage sampling module provided by an embodiment of the application; Figure 9

[0018] A structural block diagram of a comparison unit provided by an embodiment of the application; Figure 10

[0019] A work flow diagram of an overcurrent protection circuit provided by an embodiment of the application. Figure 11 DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, any other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0021] It should be noted that, in the description of the application, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. The terms “first”, “second” and the like in the application are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0022] ​​In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 A structural schematic diagram of a computing device according to an embodiment of the present application is provided.

[0024] Referring to Figure 1 , the computing device 5000 includes a cabinet 4000 and a plurality of electronic devices 3000. The cabinet 4000 is provided with a containing space, and the plurality of electronic devices 3000 are arranged in the containing space of the cabinet 4000.

[0025] For example, the electronic device 3000 can include a service node, a switching node, a storage node, etc.

[0026] In addition, the electronic device 3000 can also include a host, a mobile phone, a tablet computer, a notebook computer, etc., which are not listed one by one here.

[0027] Figure 2 A structural schematic diagram of the electronic device 3000 in Figure 1 is provided.

[0028] Referring to Figure 2 , for example, the electronic device 3000 can include a box body 3100, a circuit board 3200, a power element 3300, and a power supply module 2000.

[0029] The box body 3100 surrounds a containing space, the circuit board 3200 is arranged in the containing space, the power element 3300 and the power supply module 2000 are arranged on the circuit board 3200, and the power element 3300 is connected to the power supply module 2000, so that the power supply module 2000 can supply power to the power element 3300.

[0030] For example, the power element 3300 can include a CPU (central processing unit) and a GPU (graphics processing unit), etc.

[0031] Figure 3 A structural block diagram of the power supply module 2000 in Figure 2 is provided.

[0032] Referring to Figure 3 , the power supply module 2000 includes a DC / DC (direct current / direct current) converter, wherein the DC / DC converter can realize high-efficiency voltage conversion. For example, the DC / DC converter can include a Buck converter, a Buck-Boost converter, etc.

[0033] In addition, the power supply module 2000 can include a point-of-load (POL) 2100 and a low dropout regulator (LDO) 2200. The input of the POL 2100 can be connected to a power supply, the output of the POL 2100 can be connected to the input of the LDO 2200 and a plurality of first-type loads 2300, and the output of the LDO 2200 can be connected to a plurality of second-type loads 2400.

[0034] The POL 2100 is a miniaturized and high-efficiency DC / DC converter. The POL 2100 can convert a 12V voltage signal received at the input thereof into a 1.8V voltage signal, thereby being able to supply power to the plurality of first-type loads 2300. The first-type loads 2300 can include, for example, digital logic circuits.

[0035] The LDO 2200 can convert the 1.8V voltage into a 1.2V voltage, thereby being able to supply power to the plurality of second-type loads 2400. The second-type loads 2400 can include, for example, low-power sensors.

[0036] The input current of the LDO 2200 is equal to the output current of the LDO 2200, and the output current of the POL 2100 is equal to the input current of the LDO 2200. Therefore, the output current of the POL 2100 is equal to the output current of the LDO 2200.

[0037] When the LDO 2200 outputs a short circuit, the output current of the LDO 2200 sharply increases. This current is usually not estimated, and the POL 2100 in the front stage needs to provide a greater current. If the output current of the POL 2100 is greater than the overcurrent protection threshold of the POL 2100, the protection mechanism of the POL 2100 is triggered, and the POL 2100 is turned off, thereby causing the power supply of the entire power supply module 2000 to be interrupted, and the POL 2100 is unable to supply power to the first-type loads 2300.

[0038] If the POL 2100 supplies power to important electronic load units such as a BMC (board management controller), the BMC is unable to record a fault log, and researchers are difficult to debug.

[0039] Based on this, the embodiment of the present application provides a power supply module 2000.

[0040] Figure 4 Another structural block diagram of the overcurrent protection circuit 1000 provided by the embodiment of the present application is provided. Figure 5 Another structural block diagram of the power supply module 2000 provided by the embodiment of the present application is provided.

[0041] Please refer to Figure 4 and Figure 5 The power supply module 2000 includes a load point power converter 2100, a low dropout linear regulator 2200 and an overcurrent protection circuit 1000.

[0042] The output end of the load point power converter 2100 can provide an input voltage for the low dropout linear regulator 2200.

[0043] The load point power converter 2100 is configured to cut off the output of the load point power converter 2100 in the case that the output current of the load point power converter 2100 is greater than or equal to the current protection threshold value, at this time, the load point power converter 2100 cannot supply power for the low dropout linear regulator 2200 and the first type of load 2300.

[0044] In some examples, the low dropout linear regulator 2200 is configured to be disabled in the case that the temperature of the low dropout linear regulator 2200 exceeds a preset temperature.

[0045] Wherein, the current of the low dropout linear regulator 2200 increases when the low dropout linear regulator 2200 is short-circuited, which causes the low dropout linear regulator 2200 to heat, if the temperature of the low dropout linear regulator 2200 exceeds the preset temperature, the low dropout linear regulator 2200 will be controlled to be disabled, thereby cutting off the output current of the low dropout linear regulator 2200, so as to protect the power supply module 2000.

[0046] The overcurrent protection circuit 1000 includes a sampling unit 100, a reference source unit 200, a comparison unit 300, a processing unit 500 and an execution unit 400.

[0047] The sampling unit 100 is connected to the output end of the low dropout linear regulator 2200, and the sampling unit 100 is configured to obtain a reference parameter of the low dropout linear regulator 2200.

[0048] Wherein, the sampling unit 100 can sample the output current Iout of the low dropout linear regulator 2200.

[0049] The comparison unit 300 is connected to the sampling unit 100, and the comparison unit 300 is configured to output a first signal in the case that the reference parameter is in an abnormal reference range, and output a second signal in the case that the reference parameter is in a normal reference range.

[0050] When the reference parameter is in the abnormal reference range, it can be indicated that the low dropout linear regulator 2200 outputs abnormally, and a short circuit occurs. When the reference parameter is in the normal reference range, it can be indicated that the low dropout linear regulator 2200 outputs normally, and no short circuit occurs.

[0051] For example, the reference parameter can be the output current Iout, the comparison unit 300 can compare the reference current Iref and the output current Iout, and output different signals according to the comparison result. Wherein, if the output current Iout is greater than the reference current Iref, it indicates that the output current Iout is in the abnormal reference range, at this time, the comparison unit 300 outputs the first signal, if the output current Iout is less than the reference current Iref, it indicates that the output current Iout is in the normal reference range, at this time, the comparison unit 300 outputs the second signal.

[0052] The processing unit 500 is connected to the comparison unit 300, and the processing unit 500 is configured to: in the case of receiving the first signal, output the first signal, in the case of receiving the second signal, if the reference parameter is in the normal reference range within the first preset time period, output the second signal.

[0053] Wherein, the processing unit 500 can determine whether the reference parameter is in the normal reference range through the signal obtained by the processing unit 500, if the signal received by the processing unit 500 is the second signal, it is determined that the reference parameter is in the normal reference range, if the signal received by the processing unit 500 is the first signal, it is determined that the reference parameter is in the abnormal reference range.

[0054] In addition, the processing unit 500 can obtain the reference parameter, and determine whether the reference parameter is in the normal reference range.

[0055] The execution unit 400 is connected to the processing unit 500 and the enable end EN of the low dropout linear regulator 2200, and the execution unit 400 is configured to: in the case of receiving the first signal, control the enable end EN of the low dropout linear regulator 2200 to be grounded, so as to disable the low dropout linear regulator 2200; in the case of receiving the second signal, control the enable end EN of the low dropout linear regulator 2200 to be suspended, so as to enable the low dropout linear regulator 2200.

[0056] In the case of receiving the second signal, the enable end EN of the low dropout linear regulator 2200 is suspended, and the low dropout linear regulator 2200 is in an enabled state, at this time, the low dropout linear regulator 2200 can output current and supply power for the second type of load 2400.

[0057] In the case that the execution unit 400 receives the first signal, the execution unit 400 controls the enable end EN of the low-dropout linear regulator 2200 to be grounded, and the low-dropout linear regulator 2200 is disabled. At this time, the low-dropout linear regulator 2200 has no output, so that the output current of the low-dropout linear regulator 2200 is cut off, thereby reducing the phenomenon that the second type load 2400 connected to the low-dropout linear regulator 2200 is burned out due to excessive current.

[0058] In addition, in the case that the low-dropout linear regulator 2200 is disabled, the second type load 2400 connected to the low-dropout linear regulator 2200 cannot be connected to the load point power converter 2100, so that the load of the load point power converter 2100 can be reduced. Therefore, the load point power converter 2100 and the second type load 2400 no longer affect the output voltage and the output current of the load point power converter 2100, and the output current of the load point power converter 2100 can be reduced, thereby reducing the phenomenon that the first type load 2300 connected to the load point power converter 2100 is burned out due to excessive output current of the load point power converter 2100.

[0059] In the case that the low-dropout linear regulator 2200 is disabled, the fault can be artificially eliminated. After the fault is eliminated, the reference parameter of the low-dropout linear regulator 2200 can be within the normal range. At this time, the comparison unit 300 outputs the second signal and transmits it to the processing unit 500. If the reference parameter is within the normal reference range within the first preset time period, the processing unit 500 outputs the second signal, so that the low-dropout linear regulator 2200 can be enabled.

[0060] If the fault is not eliminated, the reference parameter is not completely within the normal range within the first preset time period. Therefore, by enabling the processing unit 500 to output the second signal in the case that the second signal is received and the reference parameter is within the normal reference range within the first preset time period, the phenomenon that the low-dropout linear regulator 2200 is restarted in the case that the fault is not eliminated can be reduced. In addition, the processing unit 500 can restart the low-dropout linear regulator 2200 in the case that the fault is eliminated, so that the circuit can operate normally, which is beneficial to realize the automatic power-on of the low-dropout linear regulator 2200.

[0061] Figure 6 Another structural block diagram of the power supply module 2000 provided by the embodiments of the present application is provided.

[0062] Please refer to Figure 6 In some embodiments, the processing unit 500 includes a switch chip 510.

[0063] The switch chip 510 includes a first input end IN1, a first output end OUT1 and a second output end OUT2. The first input end IN1 is connected to the comparison unit 300. The first output end OUT1 is connected to the execution unit 400. The second output end OUT2 is connected to the first processing module 520. The switch chip 510 is configured to, in the case that the first input end IN1 receives the first signal, connect the first input end IN1 and the first output end OUT1, so as to output the first signal at the first output end OUT1. In the case that the first input end IN1 receives the second signal, the switch chip 510 connects the first input end IN1 and the second output end OUT2, so as to output the second signal at the second output end OUT2.

[0064] In an example, the switch chip 510 further includes a common end COM connected to the first input end IN1.

[0065] The first processing module 520 is connected to the execution unit 400. The first processing module 520 is configured to, in the case that the second signal is received, output the second signal if the reference parameter is within the normal reference range within the first preset time period.

[0066] The switch chip 510 can split the first signal and the second signal. The switch chip 510 can output the first signal to the execution unit 400. The switch chip 510 can output the second signal to the first processing module 520. In this way, the first processing module 520 can process the first signal.

[0067] In some embodiments, the first processing module 520 is configured to, when the second signal is received, confirm that the reference parameter is within the normal reference range, and output the second signal if the reference parameter is within the normal reference range within the first preset time period.

[0068] The comparison unit 300 can output the second signal according to the reference parameter being within the normal range. Therefore, the first processing module 520 can confirm that the reference parameter is within the normal reference range when the second signal is received. In this way, the structure of the first processing module 520 can be simplified.

[0069] In other embodiments, the first processing module 520 includes a sampling submodule 521 and a processing submodule 522.

[0070] The sampling submodule 521 is connected between the second output end OUT2 and the processing submodule 522. The sampling submodule 521 is configured to, in the case that the second signal is received, acquire the reference parameter every second time period and send it to the processing submodule 522. The second time period is less than the first time period.

[0071] The processing submodule 522 is configured to output the second signal in a case where the reference parameter is within the normal reference range in the first preset time period.

[0072] The sampling submodule 521 can be connected to the sampling unit 100, and in this case, the sampling submodule 521 can obtain the reference parameter from the sampling unit 100 once every second time period.

[0073] By setting the sampling submodule 521 and the processing submodule 522, the processing submodule 522 can determine whether the reference parameter obtained by the sampling submodule 521 multiple times in the first time period is within the normal reference range, and output the second signal if so, thereby reducing the computational burden of the processing submodule 522.

[0074] Figure 7 The circuit diagram of the power supply module 2000 in Figure 6

[0075] Please refer to Figure 7 In some embodiments, the execution unit 400 includes a first voltage terminal VCC1, a ground terminal GND, a first control submodule 410, and a second control submodule 420.

[0076] The ground terminal GND is grounded.

[0077] The first voltage terminal VCC1 is configured to receive a first voltage signal, where the first voltage terminal VCC1 can be a positive voltage terminal with reference to ground (generally GND), that is, the voltage value of the first voltage signal is greater than 0.

[0078] The first control submodule 410 is connected to the processing unit 500 and the first voltage terminal VCC1.

[0079] The second control submodule 420 is connected to the first control submodule 410, the ground terminal GND, and the enable terminal EN of the low-dropout linear voltage regulator 2200.

[0080] The first control submodule 410 is configured to output the first voltage signal to the second control submodule 420 in a case where a first signal is received, and to control the first voltage terminal VCC1 to be disconnected from the second control submodule 420 in a case where a second signal is received.

[0081] The second control submodule 420 is configured to control the enable terminal EN of the low-dropout linear voltage regulator 2200 to be connected to the ground terminal GND in a case where the first voltage signal is received, and to control the enable terminal EN of the low-dropout linear voltage regulator 2200 to be left floating in a case where the first voltage terminal VCC1 is disconnected from the second control submodule 420.

[0082] ​The first control subunit 410 can control the first voltage terminal VCC1 and the second control subunit 420 to be connected under the control of the first signal, so that the second control subunit 420 can receive the first voltage signal. The second control subunit 420 can control the enable terminal EN of the low-dropout linear regulator 2200 to be connected to the ground terminal GND under the control of the first voltage signal, so that the low-dropout linear regulator 2200 is turned off, and the low-dropout linear regulator 2200 and the second type of load 2400 connected to the low-dropout linear regulator 2200 cannot access the output terminal of the load point power converter 2100.

[0083] The first control subunit 410 can control the first voltage terminal VCC1 and the second control subunit 420 to be disconnected under the control of the second signal. At this time, the first voltage signal cannot be transmitted to the second control subunit 420. In this case, the second control subunit 420 can disconnect the enable terminal EN of the low-dropout linear regulator 2200 and the ground terminal GND, so that the enable terminal EN of the low-dropout linear regulator 2200 is floating. In the case of the enable terminal EN floating, the low-dropout linear regulator 2200 can work normally, wherein the normal working of the low-dropout linear regulator 2200 means that the output terminal of the low-dropout linear regulator 2200 can output current and continue to supply power to the second type of load 2400.

[0084] Please refer to Figure 7 In some embodiments, the first control subunit 410 includes a first transistor T1 and a third resistor R3. The first transistor T1 includes a control electrode, a first electrode, and a second electrode. The third resistor R3 is connected between the first electrode of the first transistor T1 and the first voltage terminal VCC1. The control electrode of the first transistor T1 is connected to the first output terminal OUT1 of the switch chip 510 of the processing unit 500.

[0085] The second control subunit 420 includes a second transistor T2 and a fourth resistor R4. The second transistor T2 includes a control electrode, a first electrode, and a second electrode. The control electrode of the second transistor T2 is connected to the second electrode of the first transistor T1. The first electrode of the second transistor T2 is connected to the enable terminal EN of the low-dropout linear regulator 2200. The second electrode of the second transistor T2 is connected to the ground terminal GND.

[0086] One end of the fourth resistor R4 is connected to the control electrode of the second transistor T2, and the other end of the fourth resistor R4 is connected to the ground terminal GND.

[0087] The processing unit 500 can send the first signal or the second signal to the control electrode of the first transistor T1. Through the interaction of the first transistor T1 and the second transistor T2, the signal received by the enable terminal EN of the low-dropout linear regulator 2200 can be controlled.

[0088] The first control subunit 410 includes a first transistor T1, and the first transistor T1 can control the conduction or the shutdown between the first voltage signal end VCC and the control electrode of the second transistor T2. The control method of the first transistor T1 is relatively simple and is convenient to operate.

[0089] The second control subunit 420 includes a second transistor T2, and the second transistor T2 can control the conduction or the shutdown between the enable end EN of the low-dropout linear regulator 2200 and the ground end GND. The control method of the second transistor T2 is relatively simple and is convenient to operate.

[0090] In addition, the third resistor R3 and the fourth resistor R4 can function as voltage division. In the case that the control electrode of the first transistor T1 receives the first signal and the first transistor T1 is turned on, the third resistor R3 and the fourth resistor R4 can be connected between the first voltage signal end VCC and the ground end GND, and the control electrode of the second transistor T2 can be connected between the third resistor R3 and the fourth resistor R4. Through the voltage division of the third resistor R3 and the fourth resistor R4, the voltage of the control electrode of the second transistor T2 can be reduced, and thus the breakdown of the second transistor T2 caused by the excessive voltage difference between the control electrode of the second transistor T2 and the first electrode of the second transistor T2 can be reduced.

[0091] In addition, the fourth resistor R4 can also reduce the short circuit phenomenon between the control electrode of the second transistor T2 and the ground end GND.

[0092] For example, the first transistor T1 can be a triode, and the control electrode, the first electrode, and the second electrode of the first transistor T1 are a base b, a collector c, and an emitter e, respectively.

[0093] The second transistor T2 can be a metal oxide semiconductor (mos) field effect transistor, and the control electrode, the first electrode, and the second electrode of the second transistor T2 are a gate g, a drain d, and a source s, respectively.

[0094] When the base b of the triode receives the first signal, the triode is turned on, the emitter e of the triode is pulled up to VCC, and the voltage at the gate g of the mos tube is also pulled up after being divided by the third resistor R3 and the fourth resistor R4, reaching the opening voltage of the mos tube. After the mos tube is turned on, the enable end EN of the low-dropout linear regulator 2200 can be connected to the drain d of the mos tube through the source of the mos tube, and the drain d of the mos tube is connected to the ground end GND, so that the enable end EN of the low-dropout linear regulator 2200 can be grounded. In the case that the enable end EN of the low-dropout linear regulator 2200 is grounded, the low-dropout linear regulator 2200 is directly turned off, and the short-circuit current is directly cut off, so as not to affect the output voltage of the input end load point power converter 2100.

[0095] When the base b of the triode receives the second signal, the triode is not turned on. At this time, the gate g of the mos tube is connected to the ground through the fourth resistor R4, so that the gate g of the mos tube is discharged to the ground. At this time, Vgs=0, where Vgs=Vg-Vs, Vg is the gate voltage of the mos tube, and Vs is the source voltage of the mos tube. Since Vgs=0, the mos tube is cut off. At this time, the low-dropout linear regulator 2200 is in a suspended state, the low-dropout linear regulator 2200 has an output, and the enable end EN of the low-dropout linear regulator 2200 is only controlled by other input signals.

[0096] In some embodiments, the first transistor T1 is an n-type triode, and the second transistor T2 is an n-type mos tube; the level of the first signal is higher than the level of the second signal.

[0097] Wherein, the base b of the n-type triode can be turned on when receiving a high-level signal (i.e. the first signal), and the n-type triode is cut off when the base b of the n-type triode receives a low-level signal (i.e. the second signal). Wherein, the level of the high-level signal is higher than the level of the low-level signal.

[0098] The n-type mos tube can be turned on when the signal received by the gate g of the n-type mos tube is high, and the n-type mos tube can be cut off when the signal received by the gate g of the n-type mos tube is low.

[0099] Please refer to Figure 7 In some embodiments, the reference parameter includes: an output current.

[0100] The sampling unit 100 includes a current sampling module 110, which includes a sampling chip 111 and a second resistor R2. The sampling chip 111 and the second resistor R2 are connected in parallel and connected between the output end of the low-dropout linear regulator 2200 and the second type load 2400.

[0101] The second resistor R2 is a small resistance with high precision, which is connected in series with the output terminal of the low dropout linear regulator 2200.

[0102] According to Ohm's law, the voltage across the second resistor R2 is proportional to the current flowing through it. The output current Iout can be obtained by measuring the voltage across the second resistor R2. The sampling chip 111 connected in parallel with the second resistor R2 can be a current sampling chip, for example, the INA226 series of TI. By measuring the voltage drop Vshunt across the second resistor R2, the output current Iout can be obtained according to Ohm's law.

[0103] Referring to Figure 7 In the case where the reference parameter includes the output current, the comparison unit 300 includes a current comparison module 310, which is configured to output a first signal when the output current Iout is greater than the reference current Iref, and output a second signal when the output current Iout is less than the reference current Iref.

[0104] The current comparison module 310 includes a first comparator C1, which includes a third input terminal, a fourth input terminal, and a third output terminal. The third input terminal is connected to the sampling unit 100, the fourth input terminal is connected to the reference source unit 200, and the third output terminal is connected to the processing unit 500.

[0105] The third input terminal can be a non-inverting input terminal (+IN), which can be simply marked as "+", and the fourth input terminal can be an inverting input terminal (-IN), which can be simply marked as "-".

[0106] The output current Iout and the reference current Iref are input to the first comparator C1. The positive terminal of the first comparator C1 receives the output current Iout, and the negative terminal receives the reference current Iref.

[0107] The current comparison module 310 compares the output current Iout obtained by the sampling unit 100 with the reference current Iref. The comparison between the output current Iout and the reference current Iref can be completed by setting the first comparator C1.

[0108] In some examples, the processing unit 500 can further include a sixth resistor R6, which is connected between the first processing module 520 and the control electrode of the first transistor T1 of the execution unit 400.

[0109] The sixth resistor R6 protects the first comparator C1 and the first transistor T1 and the second transistor T2 in the subsequent execution unit 400 from abnormal current and voltage, optimizes signal quality, and ensures that the current comparison module 310 accurately and stably completes the signal comparison function.

[0110] When the output current Iout is greater than or equal to the reference current Iref, the first comparator C1 outputs a high-level signal, which can be defined as 1; when the output current Iout is less than the reference current Iref, the first comparator C1 outputs an opposite low-level signal, which can be defined as 0. The high-level signal can be a first signal, and the low-level signal can be a second signal. The high-level signal and the low-level signal can be output to the control electrode of the first transistor T1.

[0111] Please refer to Figure 7 In some embodiments, the reference source unit 200 includes a current reference source module 210, which includes a second voltage terminal VCC2, a load analog resistor Rload, and a reference source chip 211.

[0112] The second voltage terminal VCC2 is configured to receive a second voltage signal.

[0113] The load analog resistor Rload is connected between the second voltage terminal VCC2 and the comparison unit 300. The resistance value of the load analog resistor Rload is equal to the resistance value of the second-type load 2400 connected to the output terminal of the low-dropout linear voltage regulator 2200.

[0114] The reference source chip 211 is connected between the second voltage terminal VCC2 and the comparison unit 300, and is configured to output a reference voltage Vref.

[0115] The reference source chip 211 can be a programmable precision reference source.

[0116] The reference source chip 211 can generate a high-precision reference voltage Vref, which is then converted into a reference current Iref by the load analog resistor Rload. Iref=Vref / Rload.

[0117] The reference source unit 200 includes the load analog resistor Rload and the reference source chip 211. Since the load analog resistor Rload can simulate the resistance value of the second-type load 2400, the resistance value of the reference voltage Vref output by the reference source chip 211 can be controlled, thereby controlling the size of the reference current Iref.

[0118] In some examples, the reference source unit 200 further includes a current-limiting resistor R1 connected between the second voltage terminal VCC2 and the load analog resistor Rload.

[0119] By setting the current-limiting resistor R1, the current between the second voltage terminal VCC2 and the comparison unit 300 can be reduced, so that the current between the second voltage terminal VCC2 and the comparison unit 300 can be prevented from being too large.

[0120] For example, the resistance value of the current-limiting resistor R1 ranges from 1kohm to 10kohm.

[0121] Figure 8 A structure diagram of the voltage sampling module 120 provided by the embodiments of the present application.

[0122] In other embodiments, the reference parameter includes an output voltage.

[0123] The sampling unit 100 includes a voltage sampling module 120 connected to the output terminal of the LDO, and the voltage sampling module 120 is configured to obtain the output voltage of the LDO.

[0124] In some examples, the voltage sampling module 120 includes a voltage sampling sub-module 121 and a first precision resistor RSEN1, wherein the first precision resistor RSEN1 is connected to the output terminal of the LDO, and the voltage sampling sub-module 121 is connected in parallel to the first precision resistor RSEN1.

[0125] The comparison unit 300 includes a voltage comparison module configured to output a first signal when the output voltage is greater than the reference voltage, and output a second signal when the output voltage is less than the reference voltage.

[0126] When the short-circuit current increases sharply, the output voltage of the LDO will decrease, and by setting the voltage sampling module 120, the voltage comparison module can determine whether the LDO is short-circuited according to the voltage change.

[0127] Figure 9 A structure diagram of the voltage sampling module 120 provided by the embodiments of the present application.

[0128] Please refer to Figure 9 In other embodiments, the reference parameter includes a temperature.

[0129] In some examples, the temperature sampling module 130 includes an NTC thermistor RSEN2 and a temperature sampling sub-module 131, wherein the NTC thermistor RSEN2 is attached to the surface of the LDO, and the temperature sampling sub-module 131 is connected to the NTC thermistor RSEN2. In examples, the temperature sampling sub-module 131 can include a voltage sampling chip, which can convert the resistance change of the thermistor into a voltage change. At this time, the temperature sampling sub-module 131 can output a temperature voltage signal to the temperature comparison module.

[0130] The temperature comparison module is configured to: in a case where the voltage of the temperature voltage signal is greater than the second reference voltage, determine that the temperature is greater than the reference temperature, and output a first signal; and in a case where the voltage of the temperature voltage signal is less than the second reference voltage, determine that the temperature is less than the reference temperature, and output a second signal.

[0131] Figure 10 The structure block diagram of the comparison unit 300 provided by the embodiments of the present application.

[0132] Please refer to Figure 10 In some embodiments, the reference parameters include: an output current and / or an output voltage and / or a temperature.

[0133] The comparison unit 300 further includes a second processing module 340 connected to the current comparison module 310 and / or the voltage comparison module 320 and / or the temperature comparison module 330, and further connected to the input end of the execution unit. The second processing module 340 is configured to: in a case where all the received signals are the first signal, output the first signal; and in a case where the received signals include the second signal, output the second signal.

[0134] In this way, in a case where any one of the output current, the output voltage and the temperature is in the abnormal parameter range, the second processing module 340 can output the first signal, so that the execution unit 400 can control the LDO to be disabled according to the first signal, thereby improving the comprehensiveness of the line protection.

[0135] In some embodiments, the load point power converter 2100 is configured to be disabled in a case where the output current of the load point power converter 2100 is greater than or equal to a current protection threshold. The current protection threshold is greater than the reference current Iref.

[0136] The load point power converter 2100 is internally configured with a protection circuit. When the output current is greater than or equal to the current protection threshold, the protection circuit controls the load point power converter 2100 to be closed, and when the load point power converter 2100 is closed, the load point power converter 2100 is powered off, thereby avoiding the first type of load 2300 connected to the load point power converter 2100 from being burned out.

[0137] In addition, when the low-dropout linear regulator 2200 is short-circuited, the output current of the low-dropout linear regulator 2200 and the output current of the load point power converter 2100 increase sharply, and when the output current of the load point power converter 2100 increases to the current protection threshold, the load point power converter 2100 is powered off, thereby causing the first type of load 2300 connected to the load point power converter 2100 to stop working. By setting the reference current Iref to be less than or equal to the current protection threshold, when the output current Iout of the low-dropout linear regulator 2200, that is, the output current of the load point power converter 2100, reaches the reference current Iref, the overcurrent protection circuit 1000 controls the low-dropout linear regulator 2200 to be closed, thereby reducing the load connected to the load point power converter 2100, and reducing the output current of the load point power converter 2100. In this way, the output current of the load point power converter 2100 can be prevented from reaching the current protection threshold, triggering the protection circuit of the load point power converter 2100, causing the load point power converter 2100 to be powered off, and thereby reducing the phenomenon of the first type of load 2300 connected to the load point power converter 2100 being powered off.

[0138] Figure 11 The working flowchart of the overcurrent protection circuit 1000 provided by the embodiments of the present application.

[0139] Referring to Figure 11 The working flow of the overcurrent protection circuit 1000 provided by the embodiments of the present application includes the following steps S1-S4.

[0140] S1, using the reference source unit, setting the reference current Iref.

[0141] S2, using the sampling unit, monitoring the output current Iout of the LDO in real time.

[0142] S3, using the comparison unit, outputting a control signal according to the comparison result of the output current Iout and the reference current Iref. The control signal can include a first signal and a second signal.

[0143] S4, in the case that the output current Iout is greater than or equal to the reference current Iref, the LDO is turned off, and the load of the POL is reduced.

[0144] In some embodiments, the load point power converter 2100 is configured to be turned off in the case that the output current of the load point power converter 2100 is greater than or equal to the current protection threshold, wherein the current protection threshold is greater than the reference current Iref.

[0145] In some embodiments, the load point power converter 2100 is configured to be turned off in the case that the output current of the load point power converter 2100 is greater than or equal to the current protection threshold, wherein the current protection threshold is greater than the reference current Iref.

[0146] In addition, in the case that the output of the low dropout linear regulator 2200 is short-circuited, the output current of the low dropout linear regulator 2200 and the output current of the load point power converter 2100 increase sharply, and in the case that the output current of the load point power converter 2100 increases to the current protection threshold, the load point power converter 2100 is powered off, thereby causing the first type of load 2300 connected to the load point power converter 2100 to be unable to continue to work. By making the reference current Iref less than or equal to the current protection threshold, in the case that the output of the low dropout linear regulator 2200 is short-circuited, if the output current Iout of the low dropout linear regulator 2200, that is, the output current of the load point power converter 2100, reaches the reference current Iref, the overcurrent protection circuit 1000 controls the low dropout linear regulator 2200 to be turned off, thereby reducing the load connected to the load point power converter 2100, and thus the output current of the load point power converter 2100 can be reduced, so as to avoid the output current of the load point power converter 2100 reaching the current protection threshold, triggering the first protection circuit of the load point power converter 2100, causing the load point power converter 2100 to be powered off, and thus the phenomenon of the first type of load 2300 connected to the load point power converter 2100 being powered off can be reduced.

[0147] The overcurrent protection circuit, the power supply module, and the electronic device provided in the present application are described in detail above. The principles and implementation manners of the present application are described by applying specific examples, and the above examples are only used to help understand the method and core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An overcurrent protection circuit, characterized in that, include: A sampling unit is connected to the output terminal of the low-dropout linear regulator, and the sampling unit is configured to acquire reference parameters of the low-dropout linear regulator. A comparison unit is connected to the sampling unit, and the comparison unit is configured to output a first signal when the reference parameter is within an abnormal reference range, and to output a second signal when the reference parameter is within a normal reference range. A processing unit, connected to the comparison unit, is configured to: output the first signal when the first signal is received, and output the second signal when the reference parameter is within the normal reference range for a first preset time period when the second signal is received; An execution unit is connected to the processing unit and the enable terminal of the low-dropout linear regulator. The execution unit is configured to: upon receiving the first signal, control the enable terminal of the low-dropout linear regulator to be grounded to disable the low-dropout linear regulator; and upon receiving the second signal, control the enable terminal of the low-dropout linear regulator to be left floating to enable the low-dropout linear regulator. The processing unit includes: a switching chip and a first processing module; The switching chip includes a first input terminal, a first output terminal, and a second output terminal. The first input terminal is connected to the comparison unit, the first output terminal is connected to the execution unit, and the second output terminal is connected to the first processing module. The switching chip is configured to: when the first input terminal receives the first signal, connect the first input terminal and the first output terminal to output the first signal at the first output terminal; and when the first input terminal receives the second signal, connect the first input terminal and the second output terminal to output the second signal at the second output terminal. The first processing module is connected to the execution unit, and the first processing module is configured to: upon receiving the second signal, if the reference parameter is within the normal reference range within the first preset time period, output the second signal; The first processing module includes: a sampling submodule and a processing submodule; The sampling submodule is connected between the second output terminal and the processing submodule. The sampling unit is configured to: acquire the reference parameter once every second time period when the second signal is received, and send it to the first processing module. The processing submodule is configured to output the second signal when the reference parameter is within the normal reference range during the first preset time period.

2. The overcurrent protection circuit according to claim 1, characterized in that, The execution unit includes: Grounding terminal; A first voltage terminal, configured to receive a first voltage signal; The first control subunit is connected to the comparison unit and the first voltage terminal; The second control subunit is connected to the first control subunit, the ground terminal, and the enable terminal of the low-dropout linear regulator. The first control subunit is configured to: output the first voltage signal to the second control subunit when the first signal is received, and control the first voltage terminal to disconnect from the second control subunit when the second signal is received; The second control subunit is configured to: when receiving the first voltage signal, control the enable terminal of the low-dropout linear regulator to be connected to the ground terminal; and when the first voltage terminal is disconnected from the second control subunit, control the enable terminal of the low-dropout linear regulator to be left floating.

3. The overcurrent protection circuit according to claim 2, characterized in that, The first control subunit includes: a first transistor and a third resistor. The first transistor includes a control electrode, a first electrode, and a second electrode. The third resistor is connected between the first electrode of the first transistor and the first voltage terminal. The control electrode of the first transistor is connected to the comparison unit. The second control subunit includes a second transistor and a fourth resistor. The second transistor includes a control electrode, a first electrode, and a second electrode. The control electrode of the second transistor is connected to the second electrode of the first transistor. The first electrode of the second transistor is connected to the enable terminal of the low dropout linear regulator. The second electrode of the second transistor is connected to the ground terminal. One end of the fourth resistor is connected to the control electrode of the second transistor, and the other end of the fourth resistor is connected to the ground terminal.

4. The overcurrent protection circuit according to claim 3, characterized in that, The first transistor is an n-type transistor, and the second transistor is an n-type MOSFET; The level of the first signal is higher than the level of the second signal.

5. The overcurrent protection circuit according to claim 1, characterized in that, The reference parameters include: output current; the comparison unit includes a current comparison module, the current comparison module being configured to: output a first signal when the output current is greater than the reference current, and output a second signal when the output current is less than the reference current; and / or The reference parameter includes: output voltage; the comparison unit includes a voltage comparison module, the voltage comparison module being configured to: output the first signal when the output voltage is greater than the reference voltage, and output the second signal when the output voltage is less than the reference voltage; and / or... The reference parameter includes temperature. The comparison unit includes a temperature comparison module, which is configured to output the first signal when the temperature is greater than the reference temperature and to output the second signal when the temperature is less than the reference temperature. The comparison unit further includes a second processing module, which is connected to the current comparison module and / or the voltage comparison module and / or the temperature comparison module. The second processing module is configured to output the first signal when all received signals are the first signal, and to output the second signal when the received signals include the second signal.

6. A power supply module, characterized in that, include: Point-of-load power converter; A low-dropout linear regulator, wherein the input terminal of the low-dropout linear regulator is connected to the output terminal of the point-of-load power converter; The overcurrent protection circuit as described in any one of claims 1-5, wherein the sampling unit of the overcurrent protection circuit is connected to the output terminal of the low dropout linear regulator.

7. The power supply module according to claim 6, characterized in that, Reference parameters include: output current; The comparison unit includes a current comparison module, which is configured to output the first signal when the output current is greater than the reference current, and to output the second signal when the output current is less than the reference current. The point-of-load power converter is configured to disable when the output current of the point-of-load power converter is greater than or equal to a current protection threshold. The current protection threshold is greater than the reference current.

8. An electronic device, characterized in that, include: Circuit board; The power supply module as described in claim 6 or 7, wherein the power supply module is disposed on the circuit board.

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