Intelligent power switch system and electronic equipment

Abstract

The present invention proposes an intelligent power switch system and an electronic device, wherein the intelligent power switch system includes a balancing circuit and an intelligent power switch; the intelligent power switch includes a first resistor and a first switch tube, wherein the first end of the first switch tube is connected to one end of the first resistor, and the other end of the first resistor serves as a control signal input end of the intelligent power switch; the first end of the balancing circuit is connected between the first resistor and the first switch tube, and the second end of the balancing circuit is grounded; the balancing circuit is used to switch to an open state when the control signal of the intelligent power switch is at a high level, and to switch to a closed state when the control signal of the intelligent power switch is at a low level. By setting the balancing circuit, the first end of the first switch tube can be quickly discharged at a reduced voltage, the response time of the first switch tube can be reduced, the response speed can be improved, and the situation that the response time is too long and the signal transmission distortion occurs can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to an intelligent power switch system and electronic equipment. Background Art

[0002] Intelligent power devices, also known as electronic switches, use power semiconductor devices, thyristor electronic switches to replace traditional contact control devices. Compared with traditional contactors, thermal relays, and circuit breaker systems, they have no contacts or mechanical mechanisms, and do not have arcs, contact wear, or welding problems, thus improving the quality of electricity and the reliability of electricity protection and control. With the development of the electrical system of motor vehicles, intelligent power devices are gradually replacing fuses and discrete components with more complete functions, higher cost-effectiveness, stronger applicability, and higher reliability.

[0003] Smart power devices can perform state switching control based on electrical signals. When the signal transmission of smart power devices is distorted, it may affect the control of the electrical system, thereby creating risks. Therefore, it is necessary to solve the problem of signal transmission distortion of smart power devices. Summary of the invention

[0004] An object of the present invention is to provide an intelligent power switch system and an electronic device to at least partially improve the above-mentioned problem.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0006] In a first aspect, an embodiment of the present invention provides an intelligent power switch system, the intelligent power switch system comprising a balancing circuit and an intelligent power switch;

[0007] The intelligent power switch comprises a first resistor and a first switch tube, wherein a first end of the first switch tube is connected to one end of the first resistor, and the other end of the first resistor serves as a control signal input end of the intelligent power switch;

[0008] The first end of the balancing circuit is connected between the first resistor and the first switch tube, and the second end of the balancing circuit is grounded;

[0009] The balancing circuit is used to switch to an open state when the control signal of the intelligent power switch is at a high level, and to switch to a closed state when the control signal of the intelligent power switch is at a low level.

[0010] Optionally, the balancing circuit includes a first diode, a first capacitor, a second resistor, a second switch tube and a third switch tube;

[0011] The anode of the first diode and the first end of the second switch tube are both connected to the control signal input end of the intelligent power switch;

[0012] The cathode of the first diode is connected to one electrode of the first capacitor, and the other electrode of the first capacitor is grounded;

[0013] One end of the second resistor is connected between the first diode and the first capacitor, and the other end of the second resistor is connected to the first end of the third switch tube;

[0014] The second end of the second switch tube is connected between the second resistor and the third switch tube, and the third end of the second switch tube is grounded;

[0015] The second end of the third switch tube is connected between the first resistor and the first switch tube, and the third end of the third switch tube is grounded.

[0016] Optionally, when the control signal of the intelligent power switch is at a high level, the second switch tube is turned on and the third switch tube is turned off, so that the balancing circuit is switched to an off state;

[0017] When the control signal of the intelligent power switch is at a low level, the second switch tube is turned off and the third switch tube is turned on, so that the balancing circuit is switched to a closed state.

[0018] Optionally, the balancing circuit further includes a third resistor;

[0019] One end of the third resistor is connected to the second end of the third switch tube, and the other end of the third resistor serves as the first end of the balancing circuit;

[0020] The third resistor is used to balance the start-up time and the shut-down time of the intelligent power switch.

[0021] Optionally, the value of the third resistor satisfies the following formula:

[0022] R1*C*ln(VIN / (VIN-Vth))= (R1 / / R3)*C*ln(VIN / Vth);

[0023] Wherein, C represents the gate parasitic capacitance of the first switch tube, VIN represents the driving voltage, and Vth represents the voltage threshold.

[0024] Optionally, the first switch tube, the second switch tube and the third switch tube are all NMOS tubes.

[0025] Optionally, the second end of the first switch tube is used to connect to an inductor element, and the third end of the first switch tube is used to be grounded;

[0026] The intelligent power switch further includes a voltage clamping module, one end of which is connected to the first end of the first switch tube, and the other end of which is connected to the second end of the first switch tube.

[0027] Optionally, the intelligent power switch further includes an over-temperature protection module, a first end of the over-temperature protection module is connected between the first resistor and the first switch tube, and a second end of the over-temperature protection module is grounded;

[0028] The over-temperature protection module is used to monitor the temperature information of the first switch tube, and determine whether to trigger the over-temperature protection based on the temperature information. If the over-temperature protection is triggered, it switches to the on state to make the first end and the second end of the over-temperature protection module conductive.

[0029] Optionally, the intelligent power switch further includes an overcurrent protection module, a first end of the overcurrent protection module is connected between the first resistor and the first switch tube, and a second end of the overcurrent protection module is grounded;

[0030] The overcurrent protection module is used to monitor the current information of the first switch tube and determine whether to trigger the overcurrent protection based on the current information. If the overcurrent protection is triggered, it switches to the on state to connect the first end and the second end of the overcurrent protection module.

[0031] In a second aspect, an embodiment of the present invention provides an electronic device, including the above-mentioned intelligent power switch system.

[0032] Compared with the prior art, an intelligent power switch system and electronic device provided in an embodiment of the present invention include a balancing circuit and an intelligent power switch; the intelligent power switch includes a first resistor and a first switch tube, the first end of the first switch tube is connected to one end of the first resistor, and the other end of the first resistor is used as the control signal input end of the intelligent power switch; the first end of the balancing circuit is connected between the first resistor and the first switch tube, and the second end of the balancing circuit is grounded; the balancing circuit is used to switch to an open state when the control signal of the intelligent power switch is at a high level, and to switch to a closed state when the control signal of the intelligent power switch is at a low level. By setting the balancing circuit, the first end of the first switch tube can be quickly discharged at a reduced voltage, the response time of the first switch tube can be reduced, the response speed can be improved, and the situation of signal transmission distortion caused by too long response time can be avoided.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is one of the structural schematic diagrams of the intelligent power switch system provided by an embodiment of the present invention.

[0036] Figure 2 This is one of the control signal schematic diagrams provided in the embodiment of the present invention.

[0037] Figure 3 The second control signal schematic diagram provided for the embodiment of the present invention.

[0038] Figure 4 The second structural schematic diagram of the intelligent power switch system provided in the embodiment of the present invention.

[0039] Figure 5 The third structural schematic diagram of the intelligent power switch system provided in an embodiment of the present invention.

[0040] In the figure: 10-intelligent power switch; 11-voltage clamping module; 12-overtemperature protection module; 13-overcurrent protection module; 20-balancing circuit. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0048] The embodiment of the present invention provides an intelligent power switch system, please refer to Figure 1 , Figure 1 This is one of the structural schematic diagrams of the intelligent power switch system provided by an embodiment of the present invention.

[0049] The intelligent power switch system includes an intelligent power switch 10 and a balancing circuit 20 .

[0050] The intelligent power switch 10 includes a first resistor R1 and a first switch tube N1 . The first end of the first switch tube N1 is connected to one end of the first resistor R1 , and the other end of the first resistor R1 serves as a control signal input end of the intelligent power switch 10 .

[0051] The driving voltage corresponding to the control signal may be but is not limited to 5V.

[0052] Optionally, the second end of the first switch tube N1 is used to connect an inductor element, which may be connected to a power module, and the third end of the first switch tube N1 is used to ground. The first switch tube N1 may be, but is not limited to, an NMOS tube. When the first switch tube N1 is an NMOS tube, the first end of the first switch tube N1 is the gate of the NMOS tube, the second end of the first switch tube N1 is the drain of the NMOS tube, and the third end of the first switch tube N1 is the source of the NMOS tube.

[0053] A first end of the balancing circuit 20 is connected between the first resistor R1 and the first switch N1 , and a second end of the balancing circuit 20 is grounded.

[0054] The balancing circuit 20 is used to switch to an open state when the control signal of the intelligent power switch 10 is at a high level, and to switch to a closed state when the control signal of the intelligent power switch 10 is at a low level.

[0055] When the balancing circuit 20 is in a closed state, the first end and the second end inside the balancing circuit 20 are connected, that is, point A in the figure is grounded. When the balancing circuit 20 is in an open state, the first end and the second end inside the balancing circuit 20 are disconnected and not connected to each other, that is, point A in the figure is not grounded.

[0056] The control signal (IN) inputted from the control signal input terminal controls the first switch tube N1 to switch to the on state (turn on) or the off state (turn off). Figure 2 and Figure 3 , Figure 2 One of the control signal schematic diagrams provided in an embodiment of the present invention, Figure 3 The second control signal schematic diagram provided by the embodiment of the present invention. Figure 2 and Figure 3 As shown, at the first time point, the control signal (IN) changes from low to high, and the first end of the first switch tube N1 is charged through the first resistor R1. Specifically, the gate capacitor (gate capacitor) of the first switch tube N1 can be charged, and the voltage of the first end of the first switch tube N1 starts to increase from the initial voltage V0. At the second time point, the voltage of the first end of the first switch tube N1 (gate voltage, also called Vgate) is greater than the threshold voltage Vth (which can be but is not limited to 1.5V), and the first switch tube N1 is turned on. The turn-on time Ton of the first switch tube N1 is the time from the first time point to the second time point. After the second time point, the voltage of the first end of the first switch tube N1 will continue to increase until the voltage of the first end of the first switch tube N1 is charged to the full-charge voltage Vu of the capacitor.

[0057] At the third time point, the control signal (IN) changes from high to low, and the first end of the first switch tube N1 begins to discharge, specifically, the gate capacitor (gate capacitor) of the first switch tube N1 discharges. At the fourth time point, the voltage (gate voltage, also called Vgate) of the first end of the first switch tube N1 is less than the threshold voltage Vth, and the first switch tube N1 is turned off. The off time Toff of the first switch tube N1 is the time from the third time point to the fourth time point.

[0058] It should be noted that the difference between the threshold voltage Vth and the initial voltage V0 is smaller than the difference between the full-charge voltage Vu of the capacitor and the threshold voltage Vth. Figure 2 As shown, when a balancing circuit is not set, due to the relationship between the capacitor full-charge voltage Vu, the threshold voltage Vth and the initial voltage V0, the turn-on time Ton is less than the turn-off time Toff, that is, the turn-on time Ton is unbalanced with the turn-off time Toff, that is, the switching speed of the first switch tube N1 is inconsistent, which easily leads to signal transmission distortion.

[0059] In order to reduce the possibility of signal transmission distortion, a balanced circuit is introduced in the embodiment of the present invention. Figure 3 As shown, in the case of setting a balancing circuit, when the control signal (IN) is at a high level, the balancing circuit 20 remains in an open state, which does not affect the charging of the first end of the first switch tube N1, that is, the opening time Ton remains unchanged. When the control signal (IN) is at a low level, the balancing circuit 20 switches to a closed state, and the first end of the first switch tube N1 can also be discharged through the balancing circuit 20, thereby increasing the discharge speed and reducing the closing time Toff.

[0060] The intelligent power switch system provided in the embodiment of the present invention is provided with a balancing circuit, which can achieve the effect of quickly reducing the voltage and discharging the first end of the first switch tube, reducing the response time of the first switch tube, improving the response speed, and avoiding the situation where the response time is too long and causes signal transmission distortion.

[0061] Regarding the structure of the balancing circuit, the embodiment of the present invention also provides an optional implementation method, please continue to refer to Figure 1 The balancing circuit 20 includes a first diode D1, a first capacitor C1, a second resistor R2, a second switch N2, and a third switch N3.

[0062] The anode of the first diode D1 and the first end of the second switch tube N2 are both connected to the control signal input end of the intelligent power switch 10 .

[0063] The cathode of the first diode D1 is connected to one electrode of the first capacitor C1 , and the other electrode of the first capacitor C1 is grounded.

[0064] One end of the second resistor R2 is connected between the first diode D1 and the first capacitor C1 , and the other end of the second resistor R2 is connected to the first end of the third switch tube N3 .

[0065] The second end of the second switch tube N2 is connected between the second resistor R2 and the third switch tube N3 , and the third end of the second switch tube N2 is grounded.

[0066] A second end of the third switch tube N3 is connected between the first resistor R1 and the first switch tube N1 , and a third end of the third switch tube N3 is grounded.

[0067] When the control signal of the intelligent power switch 10 is at a high level, the second switch tube N2 is turned on and the third switch tube N3 is turned off, so that the balancing circuit 20 is switched to an off state.

[0068] When the control signal of the intelligent power switch 10 is at a low level, the second switch tube N2 is disconnected, the first capacitor C1 charges the first end of the third switch tube N3, and the third switch tube N3 is turned on, so that the balancing circuit 20 is switched to a closed state.

[0069] When the second switch tube N2 is an NMOS tube, the first end of the second switch tube N2 is the gate of the NMOS tube, the second end of the second switch tube N2 is the drain of the NMOS tube, and the third end of the second switch tube N2 is the source of the NMOS tube.

[0070] When the third switch tube N3 is an NMOS tube, the first end of the third switch tube N3 is the gate of the NMOS tube, the second end of the third switch tube N3 is the drain of the NMOS tube, and the third end of the third switch tube N3 is the source of the NMOS tube.

[0071] In order to further ensure the balance between the on time Ton and the off time Toff, the embodiment of the present invention also provides an optional implementation method, please refer to Figure 4 , Figure 4 The second structural schematic diagram of the intelligent power switch system provided in the embodiment of the present invention.

[0072] The balancing circuit 20 further includes a third resistor R3. One end of the third resistor R3 is connected to the second end of the third switch tube N3, and the other end of the third resistor R3 is connected between the first resistor R1 and the first switch tube N1 as the first end of the balancing circuit 20. The third resistor R3 is used to balance the startup time and shutdown time of the intelligent power switch 10.

[0073] Optionally, the value of the third resistor R3 satisfies the following formula:

[0074] R1*C*ln(VIN / (VIN-Vth))= (R1 / / R3)*C*ln(VIN / Vth);

[0075] Wherein, C represents the gate parasitic capacitance of the first switch tube N1, VIN represents the driving voltage, and Vth represents the voltage threshold.

[0076] The RC charging formula is: Vt=V0+(Vu-V0)*(1-e^(-t / RC)), where V0 is the initial voltage, Vu is the fully charged voltage of the capacitor, Vt is the voltage (gate voltage) of the first end of the first switch tube N1, t is the charging time, and RC represents the time constant for charging the gate of the first switch tube N1.

[0077] The RC discharge formula is: Vt=Vu*e^(-t / RC), where t is the discharge time.

[0078] When the control signal (IN) changes from low to high, the driving voltage (VIN) of the control signal is input in a step manner, and when the voltage at the first end of the first switch tube N1 rises to the threshold voltage Vth, the first switch tube N1 is turned on.

[0079] From Vth=V0+(Vu-V0)*(1-e^(-t / RC))=VIN*(1-e^(-Ton / RC)), we can get:

[0080] Ton=R1*C*ln(VIN / (VIN-Vth)).

[0081] When the voltage at the first end of the first switch tube N1 drops to the threshold voltage Vth, the first switch tube N1 is turned off. From Vth=Vu*e^(-t / RC)=VIN*e^(-Toff / RC), we can get:

[0082] Toff=(R1 / / R3)*C*ln(VIN / Vth).

[0083] For applications with different driving voltages VIN, the value of the third resistor R3 can be adjusted to obtain Ton=Toff.

[0084] It should be noted that the first switch tube N1 , the second switch tube N2 and the third switch tube N3 may be, but are not limited to, NMOS tubes, and may also be field effect tubes or triodes.

[0085] In an optional implementation, the second end of the first switch tube N1 is used to connect the inductor element, and the third end of the first switch tube N1 is used to ground. Regarding the structure of the intelligent power switch, the embodiment of the present invention also provides an optional implementation. Please refer to Figure 5 , Figure 5 The third structural schematic diagram of the intelligent power switch system provided in an embodiment of the present invention.

[0086] The intelligent power switch 10 further includes a voltage clamping module 11 , one end of the voltage clamping module 11 is connected to a first end of the first switch tube N1 , and the other end of the voltage clamping module 11 is connected to a second end of the first switch tube N1 .

[0087] Optionally, the voltage clamping module 11 is composed of a plurality of voltage-stabilizing diodes connected in sequence, the anode of the first voltage-stabilizing diode is connected to the first end of the first switch tube N1, and the cathode of the last voltage-stabilizing diode is connected to the second end of the first switch tube N1. The voltage clamping module 11 is used to play a role of voltage clamping protection.

[0088] Please continue to refer to Figure 5 In an optional implementation, the intelligent power switch 10 further includes an over-temperature protection module 12, a first end of the over-temperature protection module 12 is connected between the first resistor R1 and the first switch tube N1, and a second end of the over-temperature protection module 12 is grounded.

[0089] The over-temperature protection module 12 is used to monitor the temperature information of the first switch tube N1 and determine whether to trigger the over-temperature protection based on the temperature information. If the over-temperature protection is triggered, it switches to the on state to connect the first end and the second end of the over-temperature protection module 12.

[0090] When the over-temperature protection module 12 is switched to the on state, the first end and the second end of the over-temperature protection module 12 are connected, so that point A in the figure is grounded, and the first switch tube N1 is disconnected, thereby preventing its temperature from continuing to rise to achieve a protective effect.

[0091] Optionally, when the temperature of the first switch tube N1 is higher than a preset temperature, over-temperature protection is determined to be triggered. Alternatively, the temperature rise slope of the first switch tube N1 is determined based on the temperature information of the first switch tube N1, and when the temperature rise slope is greater than a first preset slope, over-temperature protection is determined to be triggered.

[0092] Please continue to refer to Figure 5 In an optional implementation, the intelligent power switch 10 further includes an overcurrent protection module 13, a first end of the overcurrent protection module 13 is connected between the first resistor R1 and the first switch tube N1, and a second end of the overcurrent protection module 13 is grounded.

[0093] The overcurrent protection module 13 is used to monitor the current information of the first switch tube N1 and determine whether to trigger the overcurrent protection based on the current information. If the overcurrent protection is triggered, it switches to the on state to connect the first end and the second end of the overcurrent protection module 13.

[0094] When the overcurrent protection module 13 is switched to the on state, the first end and the second end of the overcurrent protection module 13 are connected, so that point A in the figure is grounded, and the first switch tube N1 is disconnected, thereby preventing its temperature from continuing to rise to achieve a protective effect.

[0095] Optionally, when the current of the first switch tube N1 is higher than a preset current value, it is determined that the overcurrent protection is triggered. Alternatively, the current rising slope of the first switch tube N1 is determined based on the current information of the first switch tube N1, and when the current rising slope is greater than a second preset slope, it is determined that the overcurrent protection is triggered.

[0096] Optionally, the overcurrent protection module 13 may realize current detection through a resistor connected in series between the third terminal of the first switch tube N1 and the ground.

[0097] An embodiment of the present invention further provides an electronic device, which includes the above-mentioned intelligent power switch system.

[0098] The electronic device may be a vehicle-mounted control system, wherein the inductor-type element may be a headlight. The connection between the headlight and the ground is controlled by a control signal (IN). When the control signal (IN) is high, the headlight is connected to the ground through the first switch tube N1, and the headlight is illuminated. When the control signal (IN) is low, the headlight is not conductive to the ground, and the headlight is off. The brightness of the headlight can be adjusted by adjusting the PWM signal input to the control signal (IN). In order to make the duty cycle of the PWM input signal consistent with the actual switching action of the first switch tube N1, the on time Ton needs to be equal to the off time Toff.

[0099] In summary, an embodiment of the present invention provides an intelligent power switch system and an electronic device, wherein the intelligent power switch system includes a balancing circuit and an intelligent power switch; the intelligent power switch includes a first resistor and a first switch tube, wherein the first end of the first switch tube is connected to one end of the first resistor, and the other end of the first resistor serves as a control signal input end of the intelligent power switch; the first end of the balancing circuit is connected between the first resistor and the first switch tube, and the second end of the balancing circuit is grounded; the balancing circuit is used to switch to an open state when the control signal of the intelligent power switch is at a high level, and to switch to a closed state when the control signal of the intelligent power switch is at a low level. By setting a balancing circuit, the first end of the first switch tube can be quickly discharged at a reduced voltage, the response time of the first switch tube can be reduced, the response speed can be improved, and the situation where the response time is too long and signal transmission distortion occurs can be avoided.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0101] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An intelligent power switch system, characterized in that: The intelligent power switch system includes a balancing circuit and an intelligent power switch; The intelligent power switch comprises a first resistor and a first switch tube, wherein a first end of the first switch tube is connected to one end of the first resistor, and the other end of the first resistor serves as a control signal input end of the intelligent power switch; The first end of the balancing circuit is connected between the first resistor and the first switch tube, and the second end of the balancing circuit is grounded; The balancing circuit is used to switch to an open state when the control signal of the intelligent power switch is at a high level, and to switch to a closed state when the control signal of the intelligent power switch is at a low level; The balancing circuit includes a first diode, a first capacitor, a second resistor, a second switch tube and a third switch tube; The anode of the first diode and the first end of the second switch tube are both connected to the control signal input end of the intelligent power switch; The cathode of the first diode is connected to one electrode of the first capacitor, and the other electrode of the first capacitor is grounded; One end of the second resistor is connected between the first diode and the first capacitor, and the other end of the second resistor is connected to the first end of the third switch tube; The second end of the second switch tube is connected between the second resistor and the third switch tube, and the third end of the second switch tube is grounded; The second end of the third switch tube is connected between the first resistor and the first switch tube, and the third end of the third switch tube is grounded.

2. The intelligent power switch system according to claim 1, characterized in that: When the control signal of the intelligent power switch is at a high level, the second switch tube is turned on and the third switch tube is turned off, so that the balancing circuit is switched to an off state; When the control signal of the intelligent power switch is at a low level, the second switch tube is turned off and the third switch tube is turned on, so that the balancing circuit is switched to a closed state.

3. The intelligent power switch system according to claim 1, characterized in that: The balancing circuit further includes a third resistor; One end of the third resistor is connected to the second end of the third switch tube, and the other end of the third resistor serves as the first end of the balancing circuit; The third resistor is used to balance the start-up time and the shut-down time of the intelligent power switch.

4. The intelligent power switch system according to claim 3, characterized in that: The value of the third resistor satisfies the following formula: R1*C*ln(VIN / (VIN-Vth))= (R1 / / R3)*C*ln(VIN / Vth); Wherein, C represents the gate parasitic capacitance of the first switch tube, VIN represents the driving voltage, Vth represents the voltage threshold, R1 represents the first resistor, and R3 represents the third resistor.

5. The intelligent power switch system according to claim 1, characterized in that: The first switch tube, the second switch tube and the third switch tube are all NMOS tubes.

6. The intelligent power switch system according to claim 1, characterized in that: The second end of the first switch tube is used to connect to an inductor element, and the third end of the first switch tube is used to be grounded; The intelligent power switch further includes a voltage clamping module, one end of which is connected to the first end of the first switch tube, and the other end of which is connected to the second end of the first switch tube.

7. The intelligent power switch system according to claim 6, characterized in that: The intelligent power switch further includes an over-temperature protection module, a first end of the over-temperature protection module is connected between the first resistor and the first switch tube, and a second end of the over-temperature protection module is grounded; The over-temperature protection module is used to monitor the temperature information of the first switch tube, and determine whether to trigger the over-temperature protection based on the temperature information. If the over-temperature protection is triggered, it switches to the on state to make the first end and the second end of the over-temperature protection module conductive.

8. The intelligent power switch system according to claim 6, characterized in that: The intelligent power switch further includes an overcurrent protection module, a first end of the overcurrent protection module is connected between the first resistor and the first switch tube, and a second end of the overcurrent protection module is grounded; The overcurrent protection module is used to monitor the current information of the first switch tube and determine whether to trigger the overcurrent protection based on the current information. If the overcurrent protection is triggered, it switches to the on state to connect the first end and the second end of the overcurrent protection module.

9. An electronic device, characterized in that: An intelligent power switch system comprising any one of claims 1-8.

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