A power supply control circuit, method and power supply system

Abstract

The application discloses a power supply control circuit, a method and a power supply system, relates to the field of power supply control, and the first output end of the power supply control circuit is connected with the source of an output MOS tube and the positive pole of an input power supply respectively, the second output end of the power supply control circuit is connected with the gate of the output MOS tube, and the drain of the output MOS tube serves as a power supply output end; the power supply control circuit comprises a fast turn-off module, and the fast turn-off module comprises a first diode, a second diode, a first switch tube and a first capacitor. The application sets the fast turn-off module, charges the first capacitor when the input power supply is normal, turns off the first switch tube, and turns on the first switch tube to drive the output MOS tube to turn off when the input power supply is abnormally reduced. Due to the sensitive reaction of the fast turn-off module, the power supply link can be quickly turned off after the abnormal power supply of the input power supply is sensed, the influence time of the abnormal power supply is extremely short, the power supply stability and reliability are higher, and the influence on the service life of the output MOS tube is lower.

Description

Technical Field

[0001] This invention relates to the field of power supply control, and in particular to a power supply control circuit, method, and power supply system. Background Technology

[0002] In the era of big data, higher requirements are placed on the power supply reliability of unified storage arrays. Based on the requirements of power supply reliability, the power supply control circuit of unified storage arrays usually adopts integrated solutions, such as integrated chips TPS24741 and LM5050. These integrated solutions usually judge the voltage of the input power supply and disconnect the power supply link between the input power supply and the output terminal when a power supply abnormality is detected.

[0003] Under this working logic, common integrated solutions cannot react quickly when the power supply is abnormal. It takes some time to determine that the power supply is abnormal. During this time, the abnormal power supply will have a negative impact on the output load and will also affect the lifespan of the MOSFETs on the power supply link. The power supply stability and reliability are not ideal.

[0004] Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a power supply control circuit, method, and power supply system that offers rapid response, more accurate judgment, and reduced impact on the lifespan of MOSFETs. The specific solution is as follows:

[0006] A power supply control circuit, wherein a first output terminal of the power supply control circuit is connected to the source of an output MOSFET and the positive terminal of an input power supply, a second output terminal of the power supply control circuit is connected to the gate of the output MOSFET, and the drain of the output MOSFET serves as the power supply output terminal. The power supply control circuit includes a fast turn-off module, which includes a first diode, a second diode, a first switching transistor, and a first capacitor, wherein:

[0007] The first terminal of the first switching transistor is connected to the anode of the first diode;

[0008] The control terminal of the first switching transistor, the cathode of the first diode, and the first terminal of the first capacitor are all connected to a first common point;

[0009] The second terminal of the first capacitor is connected to the negative terminal of the input power supply;

[0010] The second terminal of the first switching transistor is connected to the cathode of the second diode;

[0011] The first terminal of the first switching transistor is used as the first output terminal, and the anode of the second diode is used as the second output terminal;

[0012] The first switch is turned on when the voltage difference between its first terminal and the control terminal exceeds a preset positive value.

[0013] Preferably, the first switching transistor is a bipolar transistor, and the collector, emitter, and base of the bipolar transistor serve as the first terminal, second terminal, and control terminal of the first switching transistor, respectively.

[0014] Preferably, the fast shutdown module further includes a first resistor, and / or a second resistor, and / or a third resistor, and / or a fourth resistor, wherein:

[0015] The first diode and the first resistor are connected in series between the first terminal of the first switching transistor and the first common point;

[0016] And / or,

[0017] The control terminal of the first switching transistor is connected to the first common point through the second resistor;

[0018] And / or,

[0019] The first capacitor and the third resistor are connected in series between the first common point and the negative terminal of the input power supply;

[0020] And / or,

[0021] The fourth resistor is connected in parallel with the first capacitor.

[0022] Preferably, the power supply control circuit further includes a push-pull module, a slow shutdown module, and / or a software shutdown module; wherein:

[0023] The slow shutdown module is used to receive the voltage of the power supply output terminal and the voltage of the positive terminal of the input power supply, compare the voltage of the power supply output terminal and the voltage of the positive terminal of the input power supply through a hysteresis comparator, and output a shutdown signal to the push-pull module according to the abnormal output result of the input power supply of the hysteresis comparator.

[0024] The software shutdown module is used to receive control signals and output shutdown signals to the push-pull module according to the control signals;

[0025] The output terminal of the push-pull module is connected to the gate of the output MOS transistor, and turns off the output MOS transistor when it receives a turn-off signal from the slow turn-off module or the software turn-off module.

[0026] Preferably, the control signal is specifically:

[0027] The processor analyzes the operating parameters and / or environmental parameters of the input power supply and / or the load circuit connected to the power supply output terminal, and sends a signal to the software shutdown module when it determines that there is an abnormality in the input power supply and / or the load circuit.

[0028] Preferably, the power supply control circuit further includes a protection module connected in parallel between the source and gate of the output MOSFET.

[0029] Preferably, the protection module includes a capacitor branch, and / or a resistor branch, and / or a diode branch;

[0030] The capacitor branch is connected in parallel with the resistor branch and the diode branch, respectively;

[0031] And / or,

[0032] The diode branch includes a first transient suppression diode and a second transient suppression diode. The anodes of the first transient suppression diode and the second transient suppression diode are respectively connected to the source and gate of the output MOSFET. The cathodes of the first transient suppression diode and the second transient suppression diode are connected together.

[0033] Preferably, the output MOS transistor is specifically a plurality of MOS transistors cascaded at the same terminal, which are equivalent to a single MOS transistor.

[0034] Accordingly, this application also discloses a power supply control method, including:

[0035] Obtain the operating parameters and / or environmental parameters of the load circuit connected to the input power supply and / or power output terminal;

[0036] Determine whether there is any abnormality in the input power supply and / or the load circuit based on the operating parameters and / or the environmental parameters;

[0037] If so, a control signal is output to the software shutdown module, so that the software shutdown module outputs a shutdown signal to the push-pull module according to the control signal, so that the push-pull module shuts down the output MOS transistor.

[0038] Accordingly, this application also discloses a power supply system, including:

[0039] The power supply control circuit as described in any of the above items;

[0040] The input power supply connected to the power supply control circuit;

[0041] The output MOS transistor is connected to the power supply control circuit.

[0042] This application discloses a power supply control circuit. The first output terminal of the power supply control circuit is connected to the source of an output MOSFET and the positive terminal of the input power supply, respectively. The second output terminal of the power supply control circuit is connected to the gate of the output MOSFET. The drain of the output MOSFET serves as the power supply output terminal. The power supply control circuit includes a fast shutdown module, which comprises a first diode, a second diode, a first switching transistor, and a first capacitor. This application incorporates a fast shutdown module in the power supply control circuit. When the input power supply is normal, current flows through the first diode to charge the first capacitor, turning off the first switching transistor. When the input power supply abnormally decreases, the first switching transistor turns on, thereby driving the output MOSFET to turn off. Because the fast shutdown module is highly sensitive, it can quickly detect power supply abnormalities and shut down the power supply link. The impact time of the abnormal power supply is extremely short, resulting in higher power supply stability and reliability, and less impact on the lifespan of the output MOSFET. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] Figure 1 This is a structural distribution diagram of a power supply control circuit in an embodiment of the present invention;

[0045] Figure 2 This is a structural distribution diagram of another power supply control circuit in an embodiment of the present invention;

[0046] Figure 3 This is a structural distribution diagram of a specific power supply control circuit in an embodiment of the present invention;

[0047] Figure 4 This is a flowchart illustrating the steps of a power supply control method in an embodiment of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Common integrated solutions cannot react quickly when the power supply is abnormal. It takes some time to determine that the power supply is abnormal. During this time, the abnormal power supply will have a negative impact on the output load and will also affect the lifespan of the MOSFETs in the power supply link. The power supply stability and reliability are not ideal.

[0050] This application incorporates a fast shutdown module in the power supply control circuit. When the input power is normal, current flows through the first diode to charge the first capacitor, turning off the first switching transistor. When the input power abnormally decreases, the first switching transistor turns on, thereby driving the output MOSFET to turn off. Because the fast shutdown module is highly sensitive, it can quickly detect abnormalities in the input power and shut down the power supply link. The impact time of the abnormal power supply is extremely short, resulting in higher power supply stability and reliability, and a lower impact on the lifespan of the output MOSFET.

[0051] This invention discloses a power supply control circuit, see [link to relevant documentation]. Figure 1 As shown, the first output terminal of the power supply control circuit is connected to the source of the output MOSFET MN and the positive terminal V+ of the input power supply, respectively. The second output terminal of the power supply control circuit is connected to the gate of the output MOSFET MN. The drain of the output MOSFET MN serves as the power supply output terminal VOUT. The power supply control circuit includes a fast turn-off module 1, which includes a first diode D1, a second diode D2, a first switching transistor K1, and a first capacitor C1, wherein:

[0052] The first terminal of the first switching transistor K1 is connected to the anode of the first diode D1;

[0053] The control terminal of the first switch K1, the cathode of the first diode D1, and the first terminal of the first capacitor C1 are all connected to the first common point P1.

[0054] The second terminal of the first capacitor C1 is connected to the negative terminal V- of the input power supply;

[0055] The second terminal of the first switching transistor K1 is connected to the cathode of the second diode D2;

[0056] The first terminal of the first switch K1 is used as the first output terminal, and the anode of the second diode D2 is used as the second output terminal;

[0057] The first switch K1 is turned on when the voltage difference between its first terminal and the control terminal exceeds a preset positive value.

[0058] Understandable, Figure 1 The power supply link connects the positive terminal V+ of the input power supply to the power output terminal VOUT via the output MOSFET MN. The on / off state of the output MOSFET MN controls the conduction or shutdown of the power supply link. In this embodiment, the fast shutdown module 1 is used to control the on / off state of the output MOSFET MN:

[0059] When the input power supply is normal, that is, when the voltage of the positive terminal V+ of the input power supply is normal, the current charges the first capacitor C1 through the first diode D1. At this time, the voltage difference between the first terminal and the control terminal of the first switch K1 is the voltage drop of the first diode D1. The voltage drop of the first diode D1 is significantly less than the preset positive value. Therefore, the first switch K1 remains in the off state. The second diode D2 is reverse cut off to further lock the off state of the first switch K1. As a result, the voltage difference between the source and gate of the output MOS transistor MN is large, so that the output MOS transistor MN remains in the on state.

[0060] When the output power supply is abnormal, which mainly refers to the abnormal decrease in the voltage of the positive terminal V+ of the input power supply or the short circuit of the input power supply, the voltage of the first terminal of the first capacitor C1 remains at its original voltage state. As a result, the cathode voltage of the first diode D1 is higher than that of the anode, and the first diode D1 is reverse cut off. The voltage difference between the first terminal and the control terminal of the first switch K1 exceeds the preset positive value and then conducts. The setting of the second diode D2 allows the current to flow through the second diode D2 to the first switch K1. Furthermore, the voltage difference between the source and gate of the output MOSFET MN drops to the voltage drop inside the first switch K1, and the output MOSFET MN is quickly turned off.

[0061] As can be seen, the fast shutdown module 1 can quickly determine whether the input power supply is abnormal and quickly shut down the output MOSFET MN. The impact time of the input power supply abnormality is short, and the impact of the abnormality on the output MOSFET MN and the load circuit after the power supply output terminal VOUT is even lower.

[0062] Understandably, based on the above control requirements for the first switching transistor K1, the first switching transistor K1 can be specifically selected as a transistor. The collector, emitter, and base of the transistor serve as the first terminal, the second terminal, and the control terminal of the first switching transistor K1, respectively. Furthermore, the first switching transistor K1 can be selected as a PNP type transistor.

[0063] Furthermore, considering the buffering requirements of the current in the fast shutdown module 1, multiple resistors can be set in the fast shutdown module 1. Specifically, the fast shutdown module 1 may also include a first resistor R1, and / or a second resistor R2, and / or a third resistor R3, and / or a fourth resistor R4, wherein:

[0064] The first diode D1 and the first resistor R1 are connected in series between the first terminal of the first switch K1 and the first common point P1;

[0065] And / or,

[0066] The control terminal of the first switching transistor K1 is connected to the first common point P1 through the second resistor R2;

[0067] And / or,

[0068] The first capacitor C1 and the third resistor R3 are connected in series between the first common point P1 and the negative terminal V- of the input power supply;

[0069] And / or,

[0070] The fourth resistor R4 and the first capacitor C1 are connected in parallel.

[0071] This embodiment incorporates a fast shutdown module in the power supply control circuit. When the input power is normal, current flows through the first diode to charge the first capacitor, turning off the first switching transistor. When the input power abnormally decreases, the first switching transistor turns on, thereby driving the output MOSFET to turn off. Because the fast shutdown module is highly sensitive, it can quickly detect power supply anomalies and shut down the power supply link. The impact time of the abnormal power supply is extremely short, resulting in higher power supply stability and reliability, and a lower impact on the lifespan of the output MOSFET.

[0072] This invention discloses a specific power supply control circuit. Compared to the previous embodiment, this embodiment further explains and optimizes the technical solution. For details, see... Figure 2 As shown, the power supply control circuit also includes a push-pull module 2, a slow shutdown module 3, and / or a software shutdown module 4; wherein:

[0073] The slow shutdown module 3 is used to receive the voltage of the power supply output terminal VOUT and the voltage of the positive terminal V+ of the input power supply, and compare the voltage of the power supply output terminal VOUT and the voltage of the positive terminal V+ of the input power supply through a hysteresis comparator, and output a shutdown signal to the push-pull module 2 according to the abnormal output result of the input power supply of the hysteresis comparator.

[0074] Software shutdown module 4 is used to receive control signals and output shutdown signals to push-pull module 2 according to the control signals;

[0075] The output terminal of push-pull module 2 is connected to the gate of output MOS transistor MN, and turns off output MOS transistor MN when it receives a turn-off signal from slow turn-off module 3 or software turn-off module 4.

[0076] Understandably, the slow shutdown module 3 includes a hysteresis comparator. The hysteresis comparator compares the voltage at the power supply output terminal VOUT with the voltage at the positive terminal V+ of the input voltage. When the difference between the voltage at the power supply output terminal VOUT and the voltage at the positive terminal V+ of the input voltage exceeds a threshold, the hysteresis comparator outputs a signal indicating an abnormal input power supply. The slow shutdown module 3 processes the signal output by the hysteresis comparator and outputs a shutdown signal to the push-pull module 2, causing the push-pull module 2 to shut down the output module MOS transistor MN.

[0077] For details, see Figure 3 As shown, the circuit structure of the slow shutdown module 3 can be as follows: Figure 3As shown, the most critical component is the hysteresis comparator UA4. The non-inverting input of UA4 is connected to the source of the output MOSFET MN via a resistor RA107, which corresponds to the positive terminal V+ of the input voltage. The inverting input of UA4 is connected to the power supply output VOUT via another resistor RA108. The output of UA4 is connected to the signal input of the push-pull circuit 2. In addition to UA4, the slow shutdown module 3 also includes a matching circuit surrounding UA4. This matching circuit includes one or more of multiple matching capacitors, multiple matching resistors, and multiple matching diodes, such as... Figure 3 As shown, the anodes of diodes DA13 and DA14 are connected to the non-inverting and inverting inputs of hysteresis comparator UA4, respectively. The cathodes of both diodes DA13 and DA14 are connected to the signal power supply SVCC. A matching capacitor CA18 is connected between the non-inverting and inverting inputs of hysteresis comparator UA4. The ground pin of hysteresis comparator UA4 is connected to the ground terminal VOUT_RTN. A matching capacitor CA22 is connected between the ground pin and the output of hysteresis comparator UA4. A matching resistor RA99 and a matching diode DA7 are connected in series between the output and the non-inverting input of hysteresis comparator UA4. The internal current of DA7 flows from the output of the hysteresis comparator UA4 to the non-inverting input. The non-inverting input of hysteresis comparator UA4 is also connected to a matching resistor RA103, the other end of which is connected to the signal power supply SVCC via another matching resistor RA95. The power supply pin of hysteresis comparator UA4 is also connected to the signal power supply SVCC via matching resistor RA95, and is also connected to the ground terminal VOUT_RTN via a matching capacitor CA17. The output of hysteresis comparator UA4 is also connected to a matching resistor RA105, the other end of which is connected to the signal power supply SVCC via matching resistor RA95. It can be understood that by analyzing whether the voltage difference between the non-inverting and inverting inputs exceeds a threshold using hysteresis comparator UA4, it can determine whether the current input power supply is abnormal, and then output a shutdown signal to push-pull module 2. This process is achieved through the cooperation of different matching components and the hysteresis comparator in the entire slow shutdown module 3. While its reaction speed is slower than that of the fast shutdown module 1, it is more accurate in determining whether the input power supply is abnormal.

[0078] Furthermore, push-pull module 2 is used to turn off the output MOS transistor MN when it receives the turn-off signal from slow turn-off module 3. Push-pull module 2 mainly amplifies the power of the turn-off signal. Furthermore, the circuit structure of push-pull module 2 can be as follows: Figure 3As shown, the bases of transistors QA16 and QA17 are connected as signal input terminals. The emitters of transistors QA16 and QA17 are connected, and their common point is connected to two resistors RA148 and RA135. The other ends of these two resistors RA148 and RA135 are connected to a diode DA27. The anode of diode DA27 serves as the output terminal of push-pull module 2, connected to the gate of the output MOSFET, and outputs a signal that can turn off the output MOSFET MN. The collector of transistor QA17 is connected to the ground terminal VOUT_RTN, and the collector of transistor QA16 is connected to the signal power supply SVCC. Furthermore, when the collector of transistor QA16 is connected to the signal power supply SVCC, it can be connected to a matching resistor RA95. In addition, the collector of transistor QA16 can also be connected to a grounding resistor CA20.

[0079] Understandably, after receiving the control signal, the software shutdown module 4 processes the control signal and then outputs a shutdown signal to the push-pull module 2. The push-pull module 2 then shuts down the output MOS transistor MN according to the shutdown signal. The specific circuit of the software shutdown module 4 can be described as follows: Figure 3 As shown, the base of transistor QA18 serves as the signal receiving terminal DISABLE_1 to receive control signals, and is also connected to a grounding resistor RA117 and a grounding capacitor CA39; the collector of transistor QA18 serves as the signal output terminal and is connected to the signal input terminal of push-pull circuit 2, and the emitter of transistor QA18 is connected to the ground terminal VOUT_RTN.

[0080] Furthermore, the control signal specifically refers to the processor analyzing the operating parameters and / or environmental parameters of the input power supply and / or the load circuit connected to the power output terminal VOUT, and sending a signal to the software shutdown module 4 when an abnormality is determined in the input power supply and / or the load circuit. It can be understood that the parameters that the processor can analyze include: the operating parameters of the input power supply, the operating parameters of the load circuit connected to the power output terminal VOUT, environmental parameters, etc., specifically including control drive signals, input voltage, input current, output voltage, output current, inlet temperature, and temperatures of key components. The processor samples these operating parameters and / or environmental parameters and intelligently analyzes the changes in the sampled values. When an abnormality is predicted, a control signal is sent to the signal receiving terminal DISABLE_1 of the software shutdown module 4, thereby intelligently shutting down the output MOSFET MN.

[0081] Understandably, the power supply control circuit also includes a protection module 5 connected in parallel between the source and gate of the output MOSFET MN. Further, the protection module 5 includes a capacitor branch, and / or a resistor branch, and / or a diode branch; the capacitor branch is connected in parallel with the resistor branch and the diode branch respectively; and / or, the diode branch includes a first transient suppression diode and a second transient suppression diode, the anodes of the first and second transient suppression diodes are connected to the source and gate of the output MOSFET MN respectively, and the cathodes of the first and second transient suppression diodes are connected together. Figure 3 As shown in the figure, the capacitor branch includes capacitor CA11, the resistor branch includes RA115, and the diode branch includes a first transient suppression diode ZDA7 and a second transient suppression diode ZDA8.

[0082] It is understandable that the output MOSFET MN is actually multiple MOSFETs cascaded at the same terminal, equivalent to a single MOSFET. For example... Figure 3 As shown, the multiple cascaded MOSFETs at the same terminal are specifically QA7, QA8, QA9, QA10, QA12, and QA13. It can be understood that the cascading of multiple MOSFETs can shunt large currents, thereby protecting the safety and reliability of the power supply link.

[0083] Furthermore, in Figure 3 The power supply link can also be connected in series with sampling resistor units RA21-RA26, RA38, RA59, RA61-RA64, RA67, RA72, RA74, and RA93. The sampling resistor unit provides the necessary sampling parameters to the processor through two terminals I_12_S+ and I_12_S-.

[0084] Furthermore, in Figure 3 The input power supply also has capacitor power supplies CA56, CA57, CA92 and CA93 connected in parallel between the positive V+ and negative V- terminals to improve the stability of the power supply link.

[0085] Understandably, besides Figure 3 Aside from the specific settings for the circuit modules, push-pull module 2, slow shutdown module 3, and software shutdown module 4 can all be implemented using other circuit connection methods. Other components can also be added to the power supply link according to the operating conditions. Figure 3 This is not the only feasible solution in this embodiment; those skilled in the art can devise alternatives based on actual needs. Figure 2 Detailed settings can be made; this embodiment does not restrict the specific structure of other circuits besides the fast shutdown module 1.

[0086] Accordingly, this application also discloses a power supply control method, see [link to relevant documentation]. Figure 4 As shown, it includes:

[0087] S1: Obtain the operating parameters and / or environmental parameters of the load circuit connected to the input power supply and / or power output terminal VOUT;

[0088] S2: Determine whether there is any abnormality in the input power supply and / or load circuit based on the operating parameters and / or environmental parameters;

[0089] S3: If so, output a control signal to the software shutdown module so that the software shutdown module outputs a shutdown signal to the push-pull module so that the push-pull module shuts down the output MOS transistor.

[0090] If not, then continue with steps S1 and S2.

[0091] Specifically, the software shutdown module and push-pull module involved in this power supply control method can be referred to the description in the above embodiment, and the specific circuit can be configured according to... Figure 2 and Figure 3 In addition to implementing the content, the corresponding circuit structure can also be designed according to the actual working conditions and user needs, as long as the software shutdown module and push-pull module can perform the signal processing functions.

[0092] Furthermore, the control signal can specifically be: the processor analyzes the operating parameters and / or environmental parameters of the input power supply and / or the load circuit connected to the power supply output terminal, and sends a signal to the software shutdown module 4 when it determines that there is an abnormality in the input power supply and / or the load circuit. It is understood that the parameters that the processor can analyze include: the operating parameters of the input power supply, the operating parameters of the load circuit connected to the power supply output terminal, environmental parameters, etc., specifically including control drive signals, input voltage, input current, output voltage, output current, inlet temperature, and key component temperatures. The processor samples these operating parameters and / or environmental parameters and intelligently analyzes the changes in the sampled values. When an abnormality is predicted, it sends a control signal to the signal receiving end of the software shutdown module, thereby intelligently shutting down the output MOSFET.

[0093] Accordingly, embodiments of this application also disclose a power supply system, including:

[0094] The power supply control circuit as described in any of the embodiments above;

[0095] The input power supply connected to the power supply control circuit;

[0096] The output MOS transistor is connected to the power supply control circuit.

[0097] This embodiment incorporates a fast shutdown module in the power supply control circuit. When the input power is normal, current flows through the first diode to charge the first capacitor, turning off the first switching transistor. When the input power abnormally decreases, the first switching transistor turns on, thereby driving the output MOSFET to turn off. Because the fast shutdown module is highly sensitive, it can quickly detect power supply anomalies and shut down the power supply link. The impact time of the abnormal power supply is extremely short, resulting in higher power supply stability and reliability, and a lower impact on the lifespan of the output MOSFET.

[0098] For details, see Figure 1 As shown, the first output terminal of the power supply control circuit is connected to the source of the output MOSFET MN and the positive terminal V+ of the input power supply, respectively. The second output terminal of the power supply control circuit is connected to the gate of the output MOSFET MN. The drain of the output MOSFET MN serves as the power supply output terminal VOUT. The power supply control circuit includes a fast turn-off module 1, which includes a first diode D1, a second diode D2, a first switching transistor K1, and a first capacitor C1, wherein:

[0099] The first terminal of the first switching transistor K1 is connected to the anode of the first diode D1;

[0100] The control terminal of the first switch K1, the cathode of the first diode D1, and the first terminal of the first capacitor C1 are all connected to the first common point P1.

[0101] The second terminal of the first capacitor C1 is connected to the negative terminal V- of the input power supply;

[0102] The second terminal of the first switching transistor K1 is connected to the cathode of the second diode D2;

[0103] The first terminal of the first switch K1 is used as the first output terminal, and the anode of the second diode D2 is used as the second output terminal;

[0104] The first switch K1 is turned on when the voltage difference between its first terminal and the control terminal exceeds a preset positive value.

[0105] Understandable, Figure 1 The power supply link connects the positive terminal V+ of the input power supply to the power output terminal VOUT via the output MOSFET MN. The on / off state of the output MOSFET MN controls the conduction or shutdown of the power supply link. In this embodiment, the fast shutdown module 1 is used to control the on / off state of the output MOSFET MN:

[0106] When the input power supply is normal, that is, when the voltage of the positive terminal V+ of the input power supply is normal, the current charges the first capacitor C1 through the first diode D1. At this time, the voltage difference between the first terminal and the control terminal of the first switch K1 is the voltage drop of the first diode D1. The voltage drop of the first diode D1 is significantly less than the preset positive value. Therefore, the first switch K1 remains in the off state. The second diode D2 is reverse cut off to further lock the off state of the first switch K1. As a result, the voltage difference between the source and gate of the output MOS transistor MN is large, so that the output MOS transistor MN remains in the on state.

[0107] When the output power supply is abnormal, which mainly refers to the abnormal decrease in the voltage of the positive terminal V+ of the input power supply or the short circuit of the input power supply, the voltage of the first terminal of the first capacitor C1 remains at its original voltage state. As a result, the cathode voltage of the first diode D1 is higher than that of the anode, and the first diode D1 is reverse cut off. The voltage difference between the first terminal and the control terminal of the first switch K1 exceeds the preset positive value and then conducts. The setting of the second diode D2 allows the current to flow through the second diode D2 to the first switch K1. Furthermore, the voltage difference between the source and gate of the output MOSFET MN drops to the voltage drop inside the first switch K1, and the output MOSFET MN is quickly turned off.

[0108] As can be seen, the fast shutdown module 1 can quickly determine whether the input power supply is abnormal and quickly shut down the output MOSFET MN. The impact time of the input power supply abnormality is short, and the impact of the abnormality on the output MOSFET MN and the load circuit after the power supply output terminal VOUT is even lower.

[0109] Understandably, based on the above control requirements for the first switching transistor K1, the first switching transistor K1 can be specifically selected as a transistor. The collector, emitter, and base of the transistor serve as the first terminal, the second terminal, and the control terminal of the first switching transistor K1, respectively. Furthermore, the first switching transistor K1 can be selected as a PNP type transistor.

[0110] Furthermore, considering the buffering requirements of the current in the fast shutdown module 1, multiple resistors can be set in the fast shutdown module 1. Specifically, the fast shutdown module 1 may also include a first resistor R1, and / or a second resistor R2, and / or a third resistor R3, and / or a fourth resistor R4, wherein:

[0111] The first diode D1 and the first resistor R1 are connected in series between the first terminal of the first switch K1 and the first common point P1;

[0112] And / or,

[0113] The control terminal of the first switching transistor K1 is connected to the first common point P1 through the second resistor R2;

[0114] And / or,

[0115] The first capacitor C1 and the third resistor R3 are connected in series between the first common point P1 and the negative terminal V- of the input power supply;

[0116] And / or,

[0117] The fourth resistor R4 and the first capacitor C1 are connected in parallel.

[0118] This embodiment incorporates a fast shutdown module in the power supply control circuit. When the input power is normal, current flows through the first diode to charge the first capacitor, turning off the first switching transistor. When the input power abnormally decreases, the first switching transistor turns on, thereby driving the output MOSFET to turn off. Because the fast shutdown module is highly sensitive, it can quickly detect power supply anomalies and shut down the power supply link. The impact time of the abnormal power supply is extremely short, resulting in higher power supply stability and reliability, and a lower impact on the lifespan of the output MOSFET.

[0119] Further, see Figure 2 As shown, the power supply control circuit also includes a push-pull module 2, a slow shutdown module 3, and / or a software shutdown module 4; wherein:

[0120] The slow shutdown module 3 is used to receive the voltage of the power supply output terminal VOUT and the voltage of the positive terminal V+ of the input power supply, and compare the voltage of the power supply output terminal VOUT and the voltage of the positive terminal V+ of the input power supply through a hysteresis comparator, and output a shutdown signal to the push-pull module 2 according to the abnormal output result of the input power supply of the hysteresis comparator.

[0121] Software shutdown module 4 is used to receive control signals and output shutdown signals to push-pull module 2 according to the control signals;

[0122] The output terminal of push-pull module 2 is connected to the gate of output MOS transistor MN, and turns off output MOS transistor MN when it receives a turn-off signal from slow turn-off module 3 or software turn-off module 4.

[0123] Understandably, the slow shutdown module 3 includes a hysteresis comparator. The hysteresis comparator compares the voltage at the power supply output terminal VOUT with the voltage at the positive terminal V+ of the input voltage. When the difference between the voltage at the power supply output terminal VOUT and the voltage at the positive terminal V+ of the input voltage exceeds a threshold, the hysteresis comparator outputs a signal indicating an abnormal input power supply. The slow shutdown module 3 processes the signal output by the hysteresis comparator and outputs a shutdown signal to the push-pull module 2, causing the push-pull module 2 to shut down the output module MOS transistor MN.

[0124] For details, see Figure 3 As shown, the circuit structure of the slow shutdown module 3 can be as follows: Figure 3As shown, the most critical component is the hysteresis comparator UA4. The non-inverting input of UA4 is connected to the source of the output MOSFET MN via a resistor RA107, which corresponds to the positive terminal V+ of the input voltage. The inverting input of UA4 is connected to the power supply output VOUT via another resistor RA108. The output of UA4 is connected to the signal input of the push-pull circuit 2. In addition to UA4, the slow shutdown module 3 also includes a matching circuit surrounding UA4. This matching circuit includes one or more of multiple matching capacitors, multiple matching resistors, and multiple matching diodes, such as... Figure 3 As shown, the anodes of diodes DA13 and DA14 are connected to the non-inverting and inverting inputs of hysteresis comparator UA4, respectively. The cathodes of both diodes DA13 and DA14 are connected to the signal power supply SVCC. A matching capacitor CA18 is connected between the non-inverting and inverting inputs of hysteresis comparator UA4. The ground pin of hysteresis comparator UA4 is connected to the ground terminal VOUT_RTN. A matching capacitor CA22 is connected between the ground pin and the output of hysteresis comparator UA4. A matching resistor RA99 and a matching diode DA7 are connected in series between the output and the non-inverting input of hysteresis comparator UA4. The internal current of DA7 flows from the output of the hysteresis comparator UA4 to the non-inverting input. The non-inverting input of hysteresis comparator UA4 is also connected to a matching resistor RA103, the other end of which is connected to the signal power supply SVCC via another matching resistor RA95. The power supply pin of hysteresis comparator UA4 is also connected to the signal power supply SVCC via matching resistor RA95, and is also connected to the ground terminal VOUT_RTN via a matching capacitor CA17. The output of hysteresis comparator UA4 is also connected to a matching resistor RA105, the other end of which is connected to the signal power supply SVCC via matching resistor RA95. It can be understood that by analyzing whether the voltage difference between the non-inverting and inverting inputs exceeds a threshold using hysteresis comparator UA4, it can determine whether the current input power supply is abnormal, and then output a shutdown signal to push-pull module 2. This process is achieved through the cooperation of different matching components and the hysteresis comparator in the entire slow shutdown module 3. While its reaction speed is slower than that of the fast shutdown module 1, it is more accurate in determining whether the input power supply is abnormal.

[0125] Furthermore, push-pull module 2 is used to turn off the output MOS transistor MN when it receives the turn-off signal from slow turn-off module 3. Push-pull module 2 mainly amplifies the power of the turn-off signal. Furthermore, the circuit structure of push-pull module 2 can be as follows: Figure 3As shown, the bases of transistors QA16 and QA17 are connected as signal input terminals. The emitters of transistors QA16 and QA17 are connected, and their common point is connected to two resistors RA148 and RA135. The other ends of these two resistors RA148 and RA135 are connected to a diode DA27. The anode of diode DA27 serves as the output terminal of push-pull module 2, connected to the gate of the output MOSFET, and outputs a signal that can turn off the output MOSFET MN. The collector of transistor QA17 is connected to the ground terminal VOUT_RTN, and the collector of transistor QA16 is connected to the signal power supply SVCC. Furthermore, when the collector of transistor QA16 is connected to the signal power supply SVCC, it can be connected to a matching resistor RA95. In addition, the collector of transistor QA16 can also be connected to a grounding resistor CA20.

[0126] Understandably, after receiving the control signal, the software shutdown module 4 processes the control signal and then outputs a shutdown signal to the push-pull module 2. The push-pull module 2 then shuts down the output MOS transistor MN according to the shutdown signal. The specific circuit of the software shutdown module 4 can be described as follows: Figure 3 As shown, the base of transistor QA18 serves as the signal receiving terminal DISABLE_1 to receive control signals, and is also connected to a grounding resistor RA117 and a grounding capacitor CA39; the collector of transistor QA18 serves as the signal output terminal and is connected to the signal input terminal of push-pull circuit 2, and the emitter of transistor QA18 is connected to the ground terminal VOUT_RTN.

[0127] Furthermore, the control signal specifically refers to the processor analyzing the operating parameters and / or environmental parameters of the input power supply and / or the load circuit connected to the power output terminal VOUT, and sending a signal to the software shutdown module 4 when an abnormality is determined in the input power supply and / or the load circuit. It can be understood that the parameters that the processor can analyze include: the operating parameters of the input power supply, the operating parameters of the load circuit connected to the power output terminal VOUT, environmental parameters, etc., specifically including control drive signals, input voltage, input current, output voltage, output current, inlet temperature, and temperatures of key components. The processor samples these operating parameters and / or environmental parameters and intelligently analyzes the changes in the sampled values. When an abnormality is predicted, a control signal is sent to the signal receiving terminal DISABLE_1 of the software shutdown module 4, thereby intelligently shutting down the output MOSFET MN.

[0128] Understandably, the power supply control circuit also includes a protection module 5 connected in parallel between the source and gate of the output MOSFET MN. Further, the protection module 5 includes a capacitor branch, and / or a resistor branch, and / or a diode branch; the capacitor branch is connected in parallel with the resistor branch and the diode branch respectively; and / or, the diode branch includes a first transient suppression diode and a second transient suppression diode, the anodes of the first and second transient suppression diodes are connected to the source and gate of the output MOSFET MN respectively, and the cathodes of the first and second transient suppression diodes are connected together. Figure 3 As shown in the figure, the capacitor branch includes capacitor CA11, the resistor branch includes RA115, and the diode branch includes a first transient suppression diode ZDA7 and a second transient suppression diode ZDA8.

[0129] It is understandable that the output MOSFET MN is actually multiple MOSFETs cascaded at the same terminal, equivalent to a single MOSFET. For example... Figure 3 As shown, the multiple cascaded MOSFETs at the same terminal are specifically QA7, QA8, QA9, QA10, QA12, and QA13. It can be understood that the cascading of multiple MOSFETs can shunt large currents, thereby protecting the safety and reliability of the power supply link.

[0130] Furthermore, in Figure 3 The power supply link can also be connected in series with sampling resistor units RA21-RA26, RA38, RA59, RA61-RA64, RA67, RA72, RA74, and RA93. The sampling resistor unit provides the necessary sampling parameters to the processor through two terminals I_12_S+ and I_12_S-.

[0131] Furthermore, in Figure 3 The input power supply also has capacitor power supplies CA56, CA57, CA92 and CA93 connected in parallel between the positive V+ and negative V- terminals to improve the stability of the power supply link.

[0132] Understandably, besides Figure 3 Aside from the specific settings for the circuit modules, push-pull module 2, slow shutdown module 3, and software shutdown module 4 can all be implemented using other circuit connection methods. Other components can also be added to the power supply link according to the operating conditions. Figure 3 This is not the only feasible solution in this embodiment; those skilled in the art can devise alternatives based on actual needs. Figure 2 Detailed settings can be made; this embodiment does not restrict the specific structure of other circuits besides the fast shutdown module 1.

[0133] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0134] The power supply control circuit, method, and power supply system provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power supply control circuit, characterized in that, The first output terminal of the power supply control circuit is connected to the source of the output MOSFET and the positive terminal of the input power supply, respectively. The second output terminal of the power supply control circuit is connected to the gate of the output MOSFET. The drain of the output MOSFET serves as the power supply output terminal. The power supply control circuit includes a fast turn-off module, which includes a first diode, a second diode, a first switching transistor, and a first capacitor, wherein: The first terminal of the first switching transistor is connected to the anode of the first diode; The control terminal of the first switching transistor, the cathode of the first diode, and the first terminal of the first capacitor are all connected to a first common point; The second terminal of the first capacitor is connected to the negative terminal of the input power supply; The second terminal of the first switching transistor is connected to the cathode of the second diode; The first terminal of the first switching transistor is used as the first output terminal, and the anode of the second diode is used as the second output terminal; The first switch is turned on when the voltage difference between its first terminal and the control terminal exceeds a preset positive value. It also includes a push-pull module, a slow shutdown module, and / or a software shutdown module; wherein: The slow shutdown module is used to receive the voltage of the power supply output terminal and the voltage of the positive terminal of the input power supply, compare the voltage of the power supply output terminal and the voltage of the positive terminal of the input power supply through a hysteresis comparator, and output a shutdown signal to the push-pull module according to the abnormal output result of the input power supply of the hysteresis comparator. The software shutdown module is used to receive control signals and output shutdown signals to the push-pull module according to the control signals; The output terminal of the push-pull module is connected to the gate of the output MOS transistor, and turns off the output MOS transistor when it receives a turn-off signal from the slow turn-off module or the software turn-off module.

2. The power supply control circuit according to claim 1, characterized in that, The first switching transistor is specifically a bipolar transistor, and the collector, emitter, and base of the bipolar transistor serve as the first terminal, the second terminal, and the control terminal of the first switching transistor, respectively.

3. The power supply control circuit according to claim 1, characterized in that, The fast shutdown module further includes a first resistor, and / or a second resistor, and / or a third resistor, and / or a fourth resistor, wherein: The first diode and the first resistor are connected in series between the first terminal of the first switching transistor and the first common point; And / or, The control terminal of the first switching transistor is connected to the first common point through the second resistor; And / or, The first capacitor and the third resistor are connected in series between the first common point and the negative terminal of the input power supply; And / or, The fourth resistor is connected in parallel with the first capacitor.

4. The power supply control circuit according to claim 1, characterized in that, The control signal is specifically: The processor analyzes the operating parameters and / or environmental parameters of the input power supply and / or the load circuit connected to the power supply output terminal, and sends a signal to the software shutdown module when it determines that there is an abnormality in the input power supply and / or the load circuit.

5. The power supply control circuit according to any one of claims 1 to 4, characterized in that, It also includes a protection module connected in parallel between the source and gate of the output MOSFET.

6. The power supply control circuit according to claim 5, characterized in that, The protection module includes a capacitor branch, and / or a resistor branch, and / or a diode branch; The capacitor branch is connected in parallel with the resistor branch and the diode branch, respectively; And / or, The diode branch includes a first transient suppression diode and a second transient suppression diode. The anodes of the first transient suppression diode and the second transient suppression diode are respectively connected to the source and gate of the output MOSFET. The cathodes of the first transient suppression diode and the second transient suppression diode are connected together.

7. The power supply control circuit according to claim 5, characterized in that, The output MOS transistors are specifically multiple MOS transistors cascaded at the same terminal, which are equivalent to a single MOS transistor.

8. A power supply control method, characterized in that, Applied to the power supply control circuit as described in any one of claims 1 to 7, comprising: Obtain the operating parameters and / or environmental parameters of the load circuit connected to the input power supply and / or power output terminal; Determine whether there is any abnormality in the input power supply and / or the load circuit based on the operating parameters and / or the environmental parameters; If so, a control signal is output to the software shutdown module, so that the software shutdown module outputs a shutdown signal to the push-pull module according to the control signal, so that the push-pull module shuts down the output MOS transistor.

9. A power supply system, characterized in that, include: The power supply control circuit as described in any one of claims 1 to 7; The input power supply connected to the power supply control circuit; The output MOS transistor is connected to the power supply control circuit.

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