Power load switch control circuit and smart mobile device

Abstract

This application discloses a power load switch control circuit and an intelligent mobile device, relating to the field of switch control technology. The power load switch control circuit includes: a control module, comprising a controller input terminal for receiving a power-on control signal and outputting a level signal based on the power-on control signal received at the controller input terminal; a MOSFET switch module connected to the control module; and a MOSFET module connected to the MOSFET switch module, a power supply, and a load, respectively. The MOSFET switch module controls the MOSFET module to turn on or off according to the level signal, thereby enabling or disabling the power supply path between the power supply and the load. This application, by introducing a current-limiting module on the control module and a MOSFET switch module between the control module and the MOSFET module, ensures the stability of the power supply system, prevents sudden power outages or output fluctuations, and thus improves the operational safety and reliability of the device.

Description

Technical Field

[0001] This application relates to the field of switch control technology, and in particular to a power load switch control circuit and an intelligent mobile device. Background Technology

[0002] In practical applications of self-moving devices such as snowplows and lawnmowers, the stability of the power supply system directly affects the overall operational safety and reliability of the machine. These devices typically operate for extended periods in complex, unsupervised outdoor environments, often under challenging conditions including significant temperature fluctuations, high humidity, dust, frequent vibrations, or undulating terrain. These complex environmental factors can easily interfere with the control components in the power management system, potentially causing MOS (Metal Oxide Semiconductor) transistors to misfire, voltage detection circuits to distort sampling, or even frequent tripping of protection circuits, leading to power supply anomalies, sudden power outages, or output fluctuations. Unstable power not only affects the core functions of the device—such as reduced sweeping or mowing efficiency—but more seriously, it can cause the device to suddenly stop operating or become uncontrollable in high-risk areas (such as near slopes or water bodies), posing potential safety hazards.

[0003] Therefore, ensuring that equipment can still operate safely and reliably under various non-ideal conditions is a problem that urgently needs to be solved. Utility Model Content

[0004] The main purpose of this application is to propose a power load switching control circuit and an intelligent mobile device, which aims to solve the problem that current devices cannot operate safely and reliably under various non-ideal conditions.

[0005] To achieve the above objectives, this application proposes a power load switch control circuit, which includes:

[0006] The control module includes a controller input terminal for receiving a power-on control signal, and for outputting a level signal according to the power-on control signal received by the controller input terminal;

[0007] A MOSFET switching module, wherein the MOSFET switching module is connected to the control module;

[0008] A MOSFET module, wherein the MOSFET module is connected to the MOSFET switching module, the power supply and the load respectively;

[0009] The MOS transistor switching module is used to control the MOS transistor module to turn on or off according to the level signal, so as to turn on or off the power supply path between the power supply and the load.

[0010] In one embodiment, the MOSFET switching module includes:

[0011] A first resistor, the first end of which is connected to the control module, and the second end of which is connected to the MOS transistor module;

[0012] A second resistor, the first end of which is connected to the control module;

[0013] The first diode has its cathode connected to the second terminal of the second resistor, and its anode connected to the MOS transistor module.

[0014] In one embodiment, the MOSFET switching module further includes a boost module, the boost module comprising:

[0015] A first capacitor, the first end of which is connected to the control module, and the second end of which is connected to both the control module and the MOS transistor module.

[0016] In one embodiment, the first terminal of the MOS transistor module is connected to the MOS transistor switching module, the second terminal of the MOS transistor module is connected to the input voltage of the power supply, and the third terminal of the MOS transistor module is connected to the load.

[0017] In one embodiment, the MOS module includes:

[0018] The NMOS transistor unit has its gate connected to the MOS transistor switching module, its drain connected to the power supply input voltage, and its source connected to the load.

[0019] In one embodiment, the NMOS transistor unit includes a plurality of NMOS transistors connected in parallel.

[0020] In one embodiment, the power load switch control circuit further includes a current limiting module, the current limiting module comprising:

[0021] The third resistor has its first end connected to the control module and its second end connected to both the control module and ground.

[0022] In one embodiment, the power load switch control circuit further includes a soft-start module, the soft-start module comprising:

[0023] A second capacitor, the first end of which is connected to the control module;

[0024] A fourth resistor, the first end of which is connected to the second end of the second capacitor, and the second end of which is connected to the control module.

[0025] In one embodiment, the power load switching control circuit further includes an input filtering module, the input filtering module comprising:

[0026] Multiple capacitors are connected in parallel. For any one capacitor, the first terminal of the capacitor is connected to the input voltage of the power supply and connected to the control module, and the second terminal of the capacitor is grounded.

[0027] The fifth resistor has its first end connected to the power-on control signal and its second end connected to the control module.

[0028] The sixth resistor, the first end of which is connected to the control module;

[0029] The second diode has its cathode connected to the power-on control signal and its anode connected to the second terminal of the sixth resistor.

[0030] The third capacitor has its first terminal connected to the second terminal of the sixth resistor, and its second terminal is grounded.

[0031] In one embodiment, the power load switch control circuit further includes an output module, a first terminal of which is connected to the MOS transistor module, a second terminal of which is connected to the load, and the output module includes a plurality of resistors connected in parallel.

[0032] This application also proposes an intelligent mobile device, which includes a power supply, a load, and the aforementioned power load switch control circuit. The power load switch control circuit is used to control the MOS transistor module to turn on or off based on the MOS transistor switch module under the control of the control module, so as to turn on or off the power supply path between the power supply and the load.

[0033] This application introduces a MOSFET switching module between the control module and the MOSFET module. The control module outputs a level signal based on the power-on control signal at the controller input. The MOSFET switching module is connected to this level signal and controls the conduction or turn-off of the MOSFET module accordingly. In other words, the MOSFET switching module acts as a dedicated drive interface, converting the control signal into a drive signal with sufficient current capability and fast edge characteristics. This ensures that the MOSFET module can quickly and completely turn on or off, significantly shortening the vulnerable period affected by interference. This achieves a controllable connection between the power supply and the load, thereby avoiding problems such as MOSFET false triggering, voltage detection distortion, or protection circuit malfunction caused by factors such as temperature changes, high humidity, dust, or vibration in complex outdoor environments. This ensures the stability of the power supply system, prevents sudden power outages or output fluctuations, and thus improves the operational safety and reliability of the equipment. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of an embodiment of the power load switch control circuit of this application;

[0036] Figure 2 This is a schematic diagram of the circuit structure of the MOSFET switching module in the power load switching control circuit of this application;

[0037] Figure 3 This is a schematic diagram of the circuit structure of the boost module in the power load switch control circuit of this application;

[0038] Figure 4 This application's power load switch control circuit also includes a current limiting module.

[0039] Figure 5 This is a schematic diagram of the circuit structure of the current limiting module in the power load switch control circuit of this application;

[0040] Figure 6 This application's power load switch control circuit also includes a soft-start module.

[0041] Figure 7 This is a schematic diagram of the circuit structure of the soft-start module in the power load switch control circuit of this application;

[0042] Figure 8 This application's power load switch control circuit also includes an input filter module.

[0043] Figure 9 This is a schematic diagram of the circuit structure of the input filter module in the power load switch control circuit of this application;

[0044] Figure 10 This application's power load switch control circuit also includes a schematic diagram of the output module;

[0045] Figure 11 This is a schematic diagram of the overall structure of the power load switch control circuit of this application;

[0046] Figure 12 This is a schematic diagram of the overall circuit structure of the power load switch control circuit of this application.

[0047] Explanation of icon numbers:

[0048] 10 Control module 20 MOSFET switching module 30 MOS transistor module 40 boost module 50 Rate limiting module 60 Soft start module 70 Input filtering module 80 Output module 31 NMOS transistor unit R1~R6 resistance D1~D2 diode C1~C7 capacitance GND land J1~J2 connector

[0049] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0052] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0053] Currently, self-operated mobile devices typically operate for extended periods in complex, unsupervised outdoor environments. Their operating scenarios may include challenging conditions such as significant temperature fluctuations, high humidity, dust, frequent vibrations, or undulating terrain. These complex environmental factors can easily interfere with the control components in the power management system. For example, they may cause MOSFETs (Metal Oxide Semiconductors) to misfire, voltage detection circuits to distort sampling, or even protection circuits to frequently trip, leading to power supply anomalies, sudden power outages, or output fluctuations. Once the power supply becomes unstable, it not only affects the core functions of the device—such as reduced cleaning or mowing efficiency—but more seriously, it may cause the device to suddenly stop operating or become uncontrollable in high-risk areas (such as slopes or near water), posing potential safety hazards. Therefore, ensuring that the device can operate safely and reliably under various non-ideal conditions is a pressing issue that needs to be addressed.

[0054] Based on this, this application provides a power load switch control circuit, which includes a control module, a controller input terminal for receiving a power-on control signal, and an output level signal according to the power-on control signal received by the controller input terminal; a MOSFET switch module connected to the control module; and a MOSFET module connected to the MOSFET switch module, a power supply, and a load, respectively. The MOSFET switch module is used to control the MOSFET module to turn on or off according to the level signal, so as to turn on or off the power supply path between the power supply and the load.

[0055] This application introduces a MOSFET switching module between the control module and the MOSFET module. The control module outputs a level signal based on the power-on control signal at the controller input. The MOSFET switching module is connected to this level signal and controls the conduction or turn-off of the MOSFET module accordingly. In other words, the MOSFET switching module acts as a dedicated drive interface, converting the control signal into a drive signal with sufficient current capability and fast edge characteristics. This ensures that the MOSFET module can quickly and completely turn on or off, significantly shortening the vulnerable period affected by interference. This achieves a controllable connection between the power supply and the load, thereby avoiding problems such as MOSFET false triggering, voltage detection distortion, or protection circuit malfunction caused by factors such as temperature changes, high humidity, dust, or vibration in complex outdoor environments. This ensures the stability of the power supply system, prevents sudden power outages or output fluctuations, and thus improves the operational safety and reliability of the equipment.

[0056] This application proposes a power load switching control circuit, referring to... Figure 1 , Figure 1 This application provides a schematic diagram of the structure of a power load switch control circuit according to an embodiment of the present application. In this embodiment, the power load switch control circuit includes:

[0057] Control module 10 includes a controller input terminal for receiving a power-on control signal, and outputs a level signal according to the power-on control signal received by the controller input terminal;

[0058] MOSFET switching module 20 is connected to control module 10;

[0059] MOSFET module 30 is connected to MOSFET switching module 20, power supply and load respectively;

[0060] The MOSFET switching module 20 is used to control the MOSFET module 30 to turn on or off according to the level signal, so as to turn on or off the power supply path between the power supply and the load.

[0061] It should be noted that the control module 10 is a circuit unit that can receive externally provided power-on control signals and generate and output corresponding level signals according to the state of the signal (usually high level or low level). This module is the decision center of the entire circuit. Its output level signal directly determines whether the subsequent circuit performs a conduction or a shutdown operation. In addition, this module integrates basic logic processing and voltage recognition functions to ensure the stability and accuracy of its output level signal.

[0062] The MOSFET switching module 20 is an interface driver circuit connected between the control module 10 and the MOSFET module 30. It converts and amplifies the level signal output by the control module 10 into a voltage signal that can quickly and effectively drive and control the gate of the subsequent MOSFET module 30, thereby achieving precise and reliable control of the power MOSFET's on and off states. The MOSFET module 30, as the final actuator, is a power switching device that, driven by the MOSFET switching module 20, is directly responsible for the high-speed on / off of the current path between the power supply and the load, serving as the core power channel carrying the entire load current.

[0063] Understandably, in complex outdoor environments, power voltage fluctuations and interference can easily lead to malfunctions of power switching components. Therefore, this implementation effectively avoids problems such as MOSFET false triggering and frequent operation of protection circuits caused by external interference such as temperature changes and vibrations by having the control module 10 receive the power-on control signal and output a level signal, which in turn drives the MOSFET module 30 to turn on or off through the MOSFET switching module 20. This achieves stable and reliable control of the current path between the power supply and the load, effectively preventing power supply abnormalities and sudden power outages, and ensuring the normal operation of the core functions of the equipment and the overall reliability of its operation.

[0064] Additionally, it should be noted that the first terminal of the MOSFET module 30 is connected to the MOSFET switching module 20, the second terminal of the MOSFET module 30 is connected to the input voltage of the power supply, and the third terminal of the MOSFET module 30 is connected to the load.

[0065] Since the transistors used in the MOS transistor module 30 in this embodiment can include both P-type and / or N-type transistors, where the P-type transistor is turned on when the gate is low and turned off when the gate is high, and the N-type transistor is turned on when the gate is high and turned off when the gate is low, meaning that the source and drain of the P-type and N-type transistors are opposite, in this embodiment, the three terminals of the MOS transistor module 30 are named as the first terminal, the second terminal, and the third terminal, respectively. Except for the first terminal being the gate, whether the second terminal is the source or the drain depends on whether the actual transistor used is P-type or N-type.

[0066] As an example, please refer to Figure 2 The MOSFET switching module 20 includes:

[0067] The first resistor R1 is connected to the control module 10 at its first end and to the MOSFET module 30 at its second end.

[0068] The second resistor R2 has its first end connected to the control module 10.

[0069] The cathode of the first diode D1 is connected to the second terminal of the second resistor R2, and the anode of the first diode D1 is connected to the MOS transistor module 30.

[0070] MOS transistor module 30 includes:

[0071] NMOS transistor unit 31, the gate G of NMOS transistor unit 31 is connected to MOS transistor switching module 20, the drain D of NMOS transistor unit 31 is connected to the input voltage of the power supply, and the source S of NMOS transistor unit 31 is connected to the load.

[0072] It should be noted that the first resistor R1 can be a pull-up resistor, so that when the GATE pin of the control module 10 outputs a high-level signal, the first resistor R1 participates in GATE charging, that is, injects charge into the gate G of the NMOS transistor unit 31 to speed up the turn-on speed; the second resistor R2 can be a pull-down resistor, so that when the GATE pin of the control module 10 outputs a low-level signal, the second resistor R2 releases the residual charge at the gate G of the NMOS transistor unit 31 by pulling it to ground, so that the NMOS transistor unit 31 is quickly turned off.

[0073] In one feasible implementation, please refer to Figure 3The MOSFET switching module 20 also includes a boost module 40, which includes:

[0074] The first capacitor C1 has its first end connected to the control module 10, and its second end connected to both the control module 10 and the MOS transistor module 30.

[0075] It should be noted that the first capacitor C1 is used to boost the gate voltage after the MOSFET is turned on, so that the gate voltage is further boosted to the voltage at the first capacitor C1 plus the gate voltage of the MOSFET switching module 20 when the boost module 40 is not configured, thereby maintaining the conduction of the MOSFET in the MOSFET module 30.

[0076] Understandably, to ensure that the level signal output by the control module 10 can stably and reliably drive the subsequent MOSFET module 30, and to prevent voltage spikes or oscillations from damaging the MOSFET module 30, the above-mentioned scheme is adopted, which uses the first resistor R1 for current limiting, the second resistor R2 and the first diode D1 for level shifting and accelerated turn-off, and the first capacitor C1 for gate voltage boosting after the MOSFET is turned on. This avoids problems such as gate drive signal distortion, oscillation or abnormal turn-off in the MOSFET module 30 caused by parasitic parameters of the circuit or environmental interference, and realizes a stable, controlled and anti-interference drive of the gate G of the MOSFET module 30, thereby improving the reliability and safety of the MOSFET switching process.

[0077] Furthermore, since a power switching element capable of efficiently carrying large load current and achieving low-voltage control of high-voltage is required, it was determined that an NMOS transistor unit 31 would be used as the actuator, with its gate G, drain D, and source S connected to the MOS transistor switching module 20, the power supply, and the load, respectively. This avoids the problems of high conduction losses, complex driving circuits, or slow switching speeds that may result from using other types of switching transistors such as PMOS transistors or bipolar transistors. It realizes the advantages of NMOS transistors, such as low on-resistance, high switching speed, and simple driving characteristics, thereby efficiently and reliably controlling the on / off state of the main power path.

[0078] In one possible implementation, the NMOS transistor unit 31 includes a plurality of NMOS transistors connected in parallel.

[0079] It is understandable that a single NMOS transistor may overheat and be damaged when dealing with a large current load due to concentrated on-resistance and power consumption. Therefore, this embodiment adopts the technical means of connecting multiple NMOS transistors in parallel to form an NMOS transistor unit 31. This can effectively avoid the defects of insufficient current carrying capacity and concentrated thermal stress caused by conventional single NMOS transistors, which lead to decreased device reliability or single-point failure. This achieves effective sharing of the total load current through parallel current sharing, reduces the conduction loss and temperature rise of a single NMOS transistor device, and thus greatly improves the overall current handling capacity of the circuit and the safety and stability of long-term operation.

[0080] This embodiment proposes a power load switching control circuit. By introducing a current limiting module 50 into the control module 10 and a MOSFET switching module 20 between the control module 10 and the MOSFET module 30, the control module 10 outputs a level signal according to the power-on control signal under current limiting. The MOSFET switching module 20 is connected to this level signal and controls the conduction or cutoff of the MOSFET module 30 accordingly. This achieves a controllable connection between the power supply and the load, thereby avoiding problems such as MOSFET false triggering, voltage detection distortion, or protection circuit malfunction caused by factors such as temperature changes, high humidity, dust, or vibration in complex outdoor environments. This ensures the stability of the power supply system, prevents sudden power outages or output fluctuations, and thus improves the operational safety and reliability of the equipment.

[0081] In one feasible implementation, please refer to Figure 4 and Figure 5 The power load switch control circuit also includes a current limiting module 50, which includes:

[0082] The third resistor R3 has its first end connected to the control module 10, and its second end connected to both the control module 10 and ground GND.

[0083] It should be noted that the current limiting module 50 is a current sampling and feedback circuit composed of a third resistor R3. When the control module 10 is a control IC (Integrated Circuit), the first end of the third resistor R3 is connected to a specific detection pin ILIM of the control module 10, and the second end is grounded to GND. By measuring the voltage drop generated by the current flowing through the resistor, a real-time current feedback signal is provided to the control module 10, thereby realizing the monitoring of load current and overcurrent protection function. Specifically, when the control module 10 uses a gate driver of model 1EDL8011, the third resistor R3 of the current limiting module 50 is connected in series in the power circuit as a current sampling resistor. The voltage drop generated across the third resistor R3 is directly proportional to the magnitude of the load current. The voltage signal corresponding to this voltage drop is fed back to the ILIM pin of the 1EDL8011 gate driver and compared with the precision voltage threshold set inside the driver. When the load current increases abnormally and causes the sampling voltage corresponding to the voltage signal to exceed the voltage threshold, the comparator inside the driver will immediately trigger the protection logic, forcibly pull down the gate drive output signal, thereby quickly turning off the external MOS transistor module 30 to cut off the power supply path and realize hardware-level overcurrent protection.

[0084] In this embodiment, a current limiting module 50 composed of a third resistor R3 is used. The first end of the third resistor R3 is connected to the control module 10, and the second end is connected to the control module 10 and ground GND respectively, so as to complete the real-time sampling and monitoring of the load circuit current. This can avoid the problem that the large current generated by the load short circuit or overload cannot be detected and cut off in time, which would lead to the overheating and damage of the MOSFET module 30 or other circuit components. It realizes the conversion of the current signal into a voltage signal and feeds it back to the control module 10, thereby supporting the triggering of the overcurrent protection function of the control module 10, effectively preventing permanent damage to the equipment under abnormal working conditions, and improving the safety and reliability of the entire power supply system.

[0085] In one feasible implementation, please refer to Figure 6 and Figure 7 The power load switch control circuit also includes a soft-start module 60, which includes:

[0086] The second capacitor C2 has its first end connected to the control module 10.

[0087] The fourth resistor R4 has its first end connected to the second end of the second capacitor C2, and its second end connected to the control module 10.

[0088] It should be noted that the soft-start module 60 is an RC delay circuit consisting of a second capacitor C2 and a fourth resistor R4. The first terminal of the second capacitor C2 is connected to the control module 10 to receive control signals, and its second terminal is connected to the drive circuit of the control module 10 via the fourth resistor R4. For example, if the control module 10 is a control IC, the first terminal of the second capacitor can be connected to the positive terminal pin CFP of the control IC's startup delay capacitor, and the second terminal of the fourth resistor R4 can be connected to the negative terminal pin CFN of the control IC's startup delay capacitor. This module uses the charging characteristics of the capacitor to slow down the rise rate of the drive signal output by the control module 10, thereby achieving smooth control of the gate voltage of the MOSFET module 30.

[0089] In this embodiment, by employing an RC delay circuit composed of a second capacitor C2 and a fourth resistor R4 connected in series, the charging characteristics of the capacitor are used to delay the establishment time of the drive signal output by the control module 10. This avoids the huge inrush current caused by the intense charging of the load capacitor at the moment of system power-on, and achieves smooth control and soft start of the gate voltage of the MOS transistor module 30. This effectively prevents damage to the power supply, MOS transistor module 30 and load caused by current stress, and ensures the stability and reliability of the device startup process.

[0090] In one feasible implementation, please refer to Figure 8 and Figure 9 The power load switch control circuit also includes an input filter module 70, which includes:

[0091] Multiple capacitors are connected in parallel. For any one capacitor, the first terminal of the capacitor is connected to the input voltage of the power supply and connected to the control module 10, and the second terminal of the capacitor is grounded to GND.

[0092] The fifth resistor R5 has its first end connected to the power-on control signal and its second end connected to the control module 10.

[0093] The sixth resistor R6 has its first end connected to the control module 10.

[0094] The cathode of the second diode D2 is connected to the power-on control signal, and the anode of the second diode D2 is connected to the second terminal of the sixth resistor R6.

[0095] The third capacitor C3 has its first terminal connected to the second terminal of the sixth resistor R6, and its second terminal is grounded to GND.

[0096] It should be noted that the input filtering module 70 is a composite circuit composed of multiple parallel capacitors, a fifth resistor R5, a sixth resistor R6, a second diode D2, and a third capacitor C3. Its core function is to filter and condition the input power supply and power-on control signal. The multiple parallel capacitors are directly connected between the power input terminal and ground (GND) to suppress high-frequency noise and voltage ripple on the power line. The fifth resistor R5 and the second diode D2 work together to limit and clamp the current and voltage of the power-on control signal. The sixth resistor R6 and the third capacitor C3 form an RC filter network to further filter out glitches and interference in the power-on control signal, thereby providing a stable and high-quality power supply and input signal for the subsequent control module 10.

[0097] The multiple capacitors connected in parallel are configured in a direct parallel configuration. The first terminal of each capacitor is connected to the input voltage terminal of the power supply and to the power input terminal of the control module. The second terminal of each capacitor is grounded. This multi-capacitor parallel structure significantly reduces the equivalent series resistance and equivalent series inductance of the power input circuit, thereby achieving efficient filtering of high-frequency noise and instantaneous voltage fluctuations in the input power supply.

[0098] Understandably, to overcome the parasitic parameter limitations of a single capacitor during filtering, such as equivalent series resistance and equivalent series inductance, and to cope with the wide frequency noise spectrum and large instantaneous current changes in complex outdoor environments, multiple capacitors are connected in parallel. The capacitance, equivalent series resistance, and equivalent series inductance of each capacitor can compensate for each other, thereby forming a low-impedance path over a wide frequency range and significantly improving the filtering effect. The specific parameter configuration needs to be designed according to the power supply noise spectrum and the transient current requirements of the load: usually, multiple small-capacity capacitors (such as 2.2μF / 100V) need to be connected in parallel to cover high-frequency noise. The rated voltage of all capacitors must be higher than the maximum input voltage of the power supply, and low equivalent series resistance types, such as X7R or X5R materials, can be selected to ensure stable operation in environments with high humidity and large temperature differences.

[0099] For example, in Figure 9 In the circuit, four capacitors C4, C5, C6, and C7 are connected in parallel to the input voltage VBAT+ of the power supply. The cathode of the second diode D2 is connected to the power-on control signal SIG_PWON_MLP, and the anode of the second diode D2 is connected to the second terminal of the sixth resistor R6.

[0100] This implementation uses multiple parallel capacitors to filter power input noise, and a scheme where the fifth resistor R5, the sixth resistor R6, the second diode D2, and the third capacitor C3 jointly perform current limiting, clamping, and filtering on the power-on control signal. This avoids the technical defects caused by high-frequency ripple and voltage glitches from the external power supply, as well as interference pulses in the power-on control signal, directly entering the control module 10 and even subsequent circuits, thus preventing control logic misjudgments, MOSFET malfunctions, or system instability. It achieves dual purification of the input power supply and the power-on control signal, providing a stable and reliable working environment for the entire control circuit, thereby significantly enhancing the circuit's anti-interference capability in complex electromagnetic environments.

[0101] In one feasible implementation, please refer to Figure 10 The power load switch control circuit also includes an output module 80. The first end of the output module 80 is connected to the MOSFET module 30, and the second end of the output module 80 is connected to the load. The output module 80 includes multiple resistors connected in parallel.

[0102] When an NMOS transistor unit 31 is used in the MOS transistor module 30, the first terminal of the output module 80 is connected to the source S of the NMOS unit 31.

[0103] It should be noted that the output module 80 is a current sampling and current sharing network composed of multiple low-resistance resistors connected in parallel. The first terminal of this module is connected to the output terminal of the MOS transistor module 30, which can be the source S of the NMOS transistor unit 31, and the second terminal is connected to the load. By connecting multiple resistors in parallel, this module can provide the control module 10 with a current sampling voltage signal for system monitoring while carrying a large output current. It also effectively shares the current and heat loss by utilizing the parallel characteristics, thereby achieving stable output and real-time monitoring of the load current.

[0104] Additionally, it should be noted that multiple resistors are connected in parallel using low-resistance, high-power resistor elements. Their first ends are connected to the output of the MOSFET module 30, and their second ends are connected to the load. This parallel configuration significantly reduces the total equivalent resistance and multiplies the power handling capacity. At the same time, it ensures that each resistor branch can evenly share the total load current and generate a voltage signal for current sampling, thereby achieving stable transmission of high current paths, accurate current monitoring, and effective heat dissipation management.

[0105] Furthermore, the power load switching control circuit may also include a copper busbar connected in parallel with the output module 80, which is used to replace traditional PCB (Printed Circuit Board) traces.

[0106] It should be noted that this copper busbar is specifically a flat or strip-shaped conductor made of a highly conductive metal (such as copper or brass). Both ends of the copper busbar are directly connected to the output terminal of the MOS transistor module 30, which can be the source (S) of the NMOS transistor unit 31, and the load terminal, respectively. Through the extremely low resistivity and cross-sectional area of ​​this copper busbar, which is much larger than the PCB traces, it can effectively shunt the dominant current, significantly reducing conduction losses and thermal effects on high-current paths. This effectively avoids the problem of PCB circuitry overheating and aging due to continuous high current flow, thereby greatly improving the current carrying capacity, heat dissipation efficiency, and long-term operational reliability of the entire output circuit.

[0107] In this embodiment, an output module 80 composed of multiple parallel resistors is set between the MOSFET module 30 and the load. The low resistance of the parallel resistor network is used to share the large load current and generate a sampling voltage for monitoring. This avoids the problems of overheating damage, current sampling accuracy distortion, and the inability of the system to achieve effective current sharing protection caused by insufficient power of a single sampling resistor. It realizes stable load carrying, accurate sampling, and overcurrent protection triggering of the output current, thereby effectively ensuring balanced power distribution and enhancing the reliability and safety of the system under high current operating conditions.

[0108] For example, in order to combine the structure and circuit of each embodiment in the above embodiments, please refer to Figure 11 and Figure 12 It is understood that the control module 10 in the diagram is a control IC: 1EDL8011 gate driver. The GND pin serves as a reference point, grounded to GND; the IN pin is used to input the power-on control signal SIG_PWON_MLB, turning on the MOSFET module 30 when the power-on control signal is high and turning it off when it is low; the CFP pin is the positive terminal of the startup delay capacitor; the CFN pin is the negative terminal of the startup delay capacitor. The CFP and CFN pins are used to control the soft-start time, connected to the second capacitor C in the external soft-start module 60. 2. The fourth resistor R4 controls the voltage ramp-up rate when the MOSFET module 30 is turned on; the ILIM pin is the current limiting function pin, which sets the current limiting threshold through the third resistor R3 in the external current limiting module 50 for overcurrent protection; the GATE pin is connected to the gate of the MOSFET module 30 to drive the MOSFET module 30 to turn on or off; the VS pin is the load power monitoring port, connected to the source of the NMOS transistor to detect the switching voltage; the VIN pin is the high-voltage power supply terminal, connected to the power input VBAT+, providing power to the internal circuitry of the control IC and the GATE driver. In the figure, J1 represents the connector output positive terminal, used to connect to the downstream load, and J2 represents the connector output ground, used to form a closed loop with J1 and reduce ground impedance.

[0109] This application also proposes a smart mobile device, which includes a power supply, a load, and a power load switching control circuit. The power load switching control circuit, under the control of a control module, controls the on / off state of a MOSFET module based on a MOSFET switching module to enable or disable the power supply path between the power supply and the load. The specific structure of this power load switching control circuit is as described in the above embodiments. Since this smart mobile device employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated upon further here.

[0110] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A power load switching control circuit, characterized in that, The power load switch control circuit includes: The control module includes a controller input terminal for receiving a power-on control signal, and for outputting a level signal according to the power-on control signal received by the controller input terminal; A MOSFET switching module, wherein the MOSFET switching module is connected to the control module; A MOSFET module, wherein the MOSFET module is connected to the MOSFET switching module, the power supply and the load respectively; The MOS transistor switching module is used to control the MOS transistor module to turn on or off according to the level signal, so as to turn on or off the power supply path between the power supply and the load.

2. The power load switching control circuit as described in claim 1, characterized in that, The MOSFET switching module includes: A first resistor, the first end of which is connected to the control module, and the second end of which is connected to the MOS transistor module; A second resistor, the first end of which is connected to the control module; The first diode has its cathode connected to the second terminal of the second resistor, and its anode connected to the MOS transistor module.

3. The power load switching control circuit as described in claim 2, characterized in that, The MOSFET switching module further includes a boost module, which includes: A first capacitor, the first end of which is connected to the control module, and the second end of which is connected to both the control module and the MOS transistor module.

4. The power load switching control circuit as described in claim 1, characterized in that, The first terminal of the MOS transistor module is connected to the MOS transistor switching module, the second terminal of the MOS transistor module is connected to the input voltage of the power supply, and the third terminal of the MOS transistor module is connected to the load.

5. The power load switching control circuit as described in claim 4, characterized in that, The MOS transistor module includes: The NMOS transistor unit has its gate connected to the MOS transistor switching module, its drain connected to the power supply input voltage, and its source connected to the load.

6. The power load switching control circuit as described in claim 5, characterized in that, The NMOS transistor unit comprises multiple NMOS transistors connected in parallel.

7. The power load switching control circuit as described in claim 1, characterized in that, The power load switch control circuit further includes a current limiting module, which includes: The third resistor has its first end connected to the control module and its second end connected to both the control module and ground.

8. The power load switching control circuit as described in claim 1, characterized in that, The power load switch control circuit further includes a soft-start module, which includes: A second capacitor, the first end of which is connected to the control module; A fourth resistor, the first end of which is connected to the second end of the second capacitor, and the second end of which is connected to the control module.

9. The power load switching control circuit as described in claim 1, characterized in that, The power load switch control circuit further includes an input filtering module, which comprises: Multiple capacitors are connected in parallel. For any one capacitor, the first terminal of the capacitor is connected to the input voltage of the power supply and connected to the control module, and the second terminal of the capacitor is grounded. The fifth resistor has its first end connected to the power-on control signal and its second end connected to the control module. The sixth resistor, the first end of which is connected to the control module; The second diode has its cathode connected to the power-on control signal and its anode connected to the second terminal of the sixth resistor. The third capacitor has its first terminal connected to the second terminal of the sixth resistor, and its second terminal is grounded.

10. The power load switching control circuit as described in claim 1, characterized in that, The power load switch control circuit also includes an output module. The first end of the output module is connected to the MOS transistor module, and the second end of the output module is connected to the load. The output module includes multiple resistors connected in parallel.

11. A smart mobile device, characterized in that, The intelligent mobile device includes a power supply, a load, and a power load switch control circuit as described in any one of claims 1 to 10. The power load switch control circuit is used, under the control of the control module, to control the conduction or cutoff of the MOS transistor module based on the MOS transistor switch module, so as to conduct or cut off the power supply path between the power supply and the load.

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