Intelligent electronic switches, integrated circuit chips, chip products and automobiles

Abstract

The present application provides an intelligent electronic switch, an integrated circuit chip, a chip product and an automobile, wherein the output current of a power switch is obtained through a current detection circuit and a main current signal is outputted, and the current processing circuit outputs a shutdown signal when it is determined that the main current signal meets a preset condition, so that the control circuit outputs a cutoff control signal, so that the drive regulation circuit controls the power switch to be quickly shut down and cut off, and thereafter, the current processing circuit further outputs a drive limiting signal according to the main current signal before the power switch is shut down and cut off, so that after the control circuit receives the drive limiting signal, the maximum output current of the power switch can be limited based on the drive limiting signal when the power switch is turned on again, thereby reducing the maximum heat generation power that can be reached by the power switch each time it is turned on, and improving the tolerance of the power switch when it is repeatedly turned on and off, thereby effectively improving the reliability of the power switch when the load is short-circuited.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent semiconductor switches, and in particular to an intelligent electronic switch, an integrated circuit chip, a chip product and an automobile. Background Art

[0002] Smart electronic switches are usually used to couple loads with batteries. They are electronic components that control the on and off of load lines. They are widely used in automotive electronics, industrial automation, medical equipment and other fields. Due to the diverse types of loads they connect and the harsh working environment, the reliability requirements for smart electronic switches are relatively high in practical applications.

[0003] In the prior art, in order to prevent the power switch in the intelligent electronic switch from being damaged due to overheating, the intelligent electronic switch can shut down the power switch in the case of over-temperature, over-current, load short circuit, etc., so as to protect the power switch. For example, when the load connected to the power switch is short-circuited, the output current on the power switch will increase instantly, and the power switch will heat up rapidly. When the temperature of the power switch is higher than the first over-temperature protection threshold, the over-temperature protection mechanism will be triggered to shut down the power switch, and when the temperature of the power switch drops below the second over-temperature protection threshold, the power switch will be controlled to turn on, thereby reducing the risk of the power switch tube being burned due to over-temperature, wherein the second over-temperature protection threshold is lower than the first over-temperature protection threshold.

[0004] However, in actual applications, when a fault such as a load short circuit occurs, the power switch may still be frequently turned on and off after the above-mentioned over-temperature protection mechanism is adopted, resulting in performance degradation of the power switch and reducing the reliability of the intelligent electronic switch. Summary of the invention

[0005] The present application provides an intelligent electronic switch, an integrated circuit chip, a chip product and an automobile, which improves the reliability of the power switch when the load is short-circuited by limiting the maximum output current when the power switch is turned on again.

[0006] In a first aspect, the present application provides an intelligent electronic switch, including a power supply terminal, a power ground terminal, a load output terminal, a power switch, a current detection circuit, a current processing circuit, a control circuit, and a drive regulation circuit;

[0007] The power supply end and the power ground end are used to be connected to a battery, and the load output end is used to be connected to a load; the power switch is used to be connected in series with the load, with a first end connected to the power supply end or the power ground end, a second end connected to the load output end, and a control end connected to the drive regulation circuit, and the drive regulation circuit is used to control the power switch to be turned on or turned off;

[0008] The current detection circuit is connected to the current processing circuit, the current processing circuit is also connected to the control circuit, the control circuit is also connected to the drive regulation circuit, and the current detection circuit is used to obtain the output current of the power switch and output the main current signal;

[0009] The current processing circuit outputs a shutdown signal when it is determined that the main current signal meets a preset condition, and the control circuit outputs a cutoff control signal when receiving the shutdown signal, so that the drive regulation circuit controls the power switch to be turned off;

[0010] Among them, the current processing circuit is also used to output a drive limit signal according to the main current signal before the power switch is turned off, and the control circuit receives the drive limit signal and limits the maximum output current of the power switch based on the drive limit signal when the power switch is turned on again.

[0011] In a possible design of the present application, the current processing circuit is also used to generate a first coding signal. When the first coding signal meets a preset condition, the current processing circuit also generates the shutdown signal and synchronously determines the drive limit signal based on the first coding signal.

[0012] Optionally, the current processing circuit includes a threshold determination unit, an abnormality judgment unit and a current limiting unit;

[0013] One end of the threshold determination unit is connected to the current detection circuit, and the other end is connected to the abnormality judgment unit, the abnormality judgment unit is also connected to the current limiting unit and the control circuit respectively, and the current limiting unit is also connected to the control circuit;

[0014] The threshold determination unit is used to generate a second coding signal corresponding to the main current signal. The abnormality judgment unit generates a first coding signal based on the second coding signal, and outputs the first coding signal to the current limiting unit. When the first coding signal meets a preset condition, the abnormality judgment unit outputs a shutdown signal and the current limiting unit determines the drive limit signal according to the first coding signal.

[0015] In another possible design of the present application, the current processing circuit is also used to obtain a second coding signal, which corresponds to the main current signal. When the main current signal meets a preset condition, the current processing circuit determines a target coding signal based on all the acquired second coding signals, and determines the drive limit signal based on the target coding signal, wherein the target coding signal is used to characterize the maximum current threshold reached before the power switch is shut down.

[0016] Optionally, the current processing circuit includes a threshold determination unit, an abnormality judgment unit and a current limiting unit;

[0017] One end of the threshold determination unit is connected to the current detection circuit, and the other end is connected to the abnormality judgment unit and the current limiting unit, the abnormality judgment unit is also connected to the current limiting unit and the control circuit respectively, and the current limiting unit is also connected to the control circuit;

[0018] The threshold determination unit is used to generate the second coding signal corresponding to the main current signal, the abnormality judgment unit generates a first coding signal based on the second coding signal, and when the first coding signal meets a preset condition, the abnormality judgment unit outputs a shutdown signal. The current limiting unit is also used to receive the second coding signal, and when the current limiting unit receives the shutdown signal, it determines a target coding signal based on all received second coding signals, and determines the drive limit signal based on the target coding signal.

[0019] Optionally, the threshold determination unit includes N current comparison units, the abnormality judgment unit includes (N-1) timing units, (N-1) timing comparison units and an abnormality determination unit, and N is an integer greater than or equal to 2;

[0020] The first input ends of the N current comparison units are connected to the current detection circuit, the second input ends of the N current comparison units are connected to the N current thresholds that increase in sequence, the output ends of the N current comparison units are connected to the input ends of the (N-1) timing units and the abnormality determination unit, the output ends of the (N-1) timing units are connected to the first input ends of the (N-1) timing comparison units, the second input ends of the (N-1) timing comparison units are connected to the (N-1) duration threshold information that decreases in sequence, and the output ends of the (N-1) timing comparison units are connected to the abnormality determination unit;

[0021] N current comparison units compare the main current signal with N current thresholds correspondingly, output a first level signal when the main current signal is greater than or equal to the corresponding current threshold, and output a second level signal when the main current signal is less than the corresponding current threshold, and the N-bit level signals output by the N current comparison units form a second coded signal corresponding to the main current signal;

[0022] The (N-1) timing units all start timing when receiving a first level signal, and continuously output timing information during the timing process or output timing information when receiving a second level signal. The (N-1) timing comparison units correspondingly compare the timing information of the (N-1) timing units with the (N-1) duration threshold information, and output a third level signal when the timing information is greater than or equal to the corresponding duration threshold information, and output a fourth level signal when the timing information is less than the corresponding duration threshold information. The level signal output by the Nth current comparison unit and the (N-1) level signal output by the (N-1) timing comparison unit form a first coded signal; wherein the preset condition is that the first level signal or the third level signal exists in the first coded signal.

[0023] In another possible design of the present application, the main current signal before the power switch is turned off is positively correlated with the maximum output current when the power switch is turned on again. The larger the main current signal before the power switch is turned off, the larger the maximum output current when the power switch is turned on again.

[0024] In another possible design of the present application, the control circuit includes a drive control subcircuit and a current limiting output subcircuit;

[0025] The first input end of the drive control subcircuit is used to receive a drive control signal, the second input end of the drive control subcircuit and one end of the current limiting output subcircuit are both connected to the current processing circuit, and the output end of the drive control subcircuit and the other end of the current limiting output subcircuit are both connected to the drive regulation circuit;

[0026] The drive control subcircuit shields the drive control signal and outputs a cutoff control signal when receiving the shutdown signal, so that the drive regulation circuit controls the power switch to be shut down. The current limiting output subcircuit is used to output the received drive limiting signal when receiving a trigger signal, and the trigger signal is used to indicate that the power switch has been completely shut down.

[0027] Optionally, the intelligent electronic switch further includes a voltage detection circuit, and the control circuit further includes a voltage judgment subcircuit; the two ends of the voltage detection circuit are correspondingly connected to the control end of the power switch and the second end of the power switch, and the voltage detection circuit is used to detect the gate-source voltage of the power switch and output a gate-source voltage signal; the voltage judgment subcircuit, whose first input end is connected to the voltage detection circuit, whose second input end is used to access a preset voltage threshold, and whose output end is connected to the current limiting output subcircuit, and the voltage judgment subcircuit outputs the trigger signal when the gate-source voltage signal of the power switch is less than or equal to the preset voltage threshold; or,

[0028] The control circuit further includes a current judgment subcircuit; the current judgment subcircuit has a first input terminal connected to the current detection circuit to access the main current signal, a second input terminal for accessing the first preset threshold, and an output terminal connected to the current limiting output subcircuit, and the current judgment subcircuit outputs the trigger signal when the current characterization value of the main current signal is less than or equal to the first preset threshold; or,

[0029] The control circuit also includes a timing subcircuit, one end of which is connected to the drive control subcircuit, and the other end of which is connected to the current limiting output subcircuit. The timing subcircuit starts timing when receiving the cutoff control signal, and outputs the trigger signal when the timing information reaches the preset time information.

[0030] Optionally, the driving regulation circuit includes a charging unit, a charging switch, a discharging switch and a regulating unit;

[0031] The charging unit and the charging switch are connected in series to form a charging branch, one end of the charging branch is connected to the first power supply end, the other end of the charging branch is connected to the control end of the power switch, the two ends of the discharge switch are connected to the control end and the second end of the power switch respectively, the two ends of the regulating unit are connected to the control end and the second end of the power switch respectively, the control end of the charging switch and the control end of the discharge switch are both connected to the drive control subcircuit, and the regulating end of the regulating unit is connected to the current limiting output subcircuit;

[0032] When receiving the cut-off control signal, the driving regulation circuit controls the charging switch to be turned off and the discharging switch to be turned on, thereby causing the power switch to be turned off;

[0033] When receiving the start-up control signal, the drive regulation circuit controls the charging switch to be turned on and the discharging switch to be turned off, and adjusts the current flowing through the regulation unit based on the received drive limit signal to adjust the voltage of the control end of the power switch, thereby limiting the maximum output current of the power switch.

[0034] Optionally, the driving regulation circuit includes a charging unit, a charging switch, a discharging switch and a regulating unit;

[0035] The charging unit and the charging switch are connected in series to form a charging branch, one end of the charging branch is connected to the first power supply end, the other end of the charging branch is connected to the control end of the power switch, the two ends of the discharge switch are correspondingly connected to the control end and the second end of the power switch, the two ends of the regulating unit are correspondingly connected to the first power supply end and the second end of the power switch, the control end of the charging switch and the control end of the discharge switch are both connected to the drive control subcircuit, and the regulating end of the regulating unit is connected to the current limiting output subcircuit;

[0036] When receiving the cut-off control signal, the driving regulation circuit controls the charging switch to be turned off and the discharging switch to be turned on, thereby causing the power switch to be turned off;

[0037] When receiving the start control signal, the drive regulation circuit controls the charging switch to be turned on and the discharging switch to be turned off, and adjusts the voltage of the first power supply end through the regulation unit based on the received drive limit signal to adjust the voltage of the control end of the power switch, thereby limiting the maximum output current of the power switch.

[0038] Optionally, the adjustment unit includes any one of the following:

[0039] A variable current source, a variable resistor, a switch tube, and a switch tube and a resistor connected in series.

[0040] In a second aspect, an embodiment of the present application provides an integrated circuit chip, comprising an intelligent electronic switch as described in the first aspect and its possible design, wherein the power supply end is a power supply pin, the power ground end is a power ground pin, and the load output end is a load output pin.

[0041] In a third aspect, an embodiment of the present application provides a chip product, including the intelligent electronic switch as described in the first aspect and possible designs thereof, wherein components of the intelligent electronic switch except for a power switch and some components of a current detection circuit are located on a first integrated circuit chip, and the power switch and some components of the current detection circuit are located on a second integrated circuit chip;

[0042] Among them, the power supply end is a power supply pin, the power ground end is a power ground pin, and the load output end is a load output pin. The power supply pin and the power ground pin are located on a first integrated circuit chip, and the load output pin is located on a second integrated circuit chip.

[0043] In a fourth aspect, an embodiment of the present application provides an automobile, comprising the intelligent electronic switch as described in the first aspect and its possible design, or the integrated circuit chip as described in the second aspect, or the chip product as described in the third aspect;

[0044] It also includes a battery, a load and a microprocessor, wherein the positive electrode of the battery is connected to the power supply terminal, the negative electrode of the battery is connected to the power ground terminal, one end of the load is connected to the load output terminal, the other end of the load is connected to the power ground terminal or the power supply terminal, and the microprocessor is connected to the intelligent electronic switch.

[0045] Optionally, the vehicle is an electric vehicle, a hybrid vehicle or a fuel vehicle, and the load includes at least one of a resistive load, an inductive load and a capacitive load.

[0046] The intelligent electronic switch, integrated circuit chip, chip product and automobile provided by the present application obtain the output current of the power switch and output the main current signal through the current detection circuit. The current processing circuit outputs a shutdown signal when it is determined that the main current signal meets the preset conditions, so that the control circuit can output a cut-off control signal to enable the drive regulation circuit to control the power switch to be quickly shut down and cut off. In addition, the current processing circuit can also output a drive limiting signal according to the main current signal before the power switch is shut down and cut off. In this way, after the control circuit receives the drive limiting signal, it can limit the maximum output current of the power switch based on the drive limiting signal when the power switch is turned on again, thereby reducing the maximum heat generation power that can be achieved each time the power switch is turned on (based on a certain drain-source voltage of the power switch), and improving the tolerance of the power switch when it is repeatedly turned on and off, thereby effectively improving the reliability of the power switch when the load is short-circuited. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0048] Figure 1 This is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the first embodiment of the present application;

[0049] Figure 2A This is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the second embodiment of the present application;

[0050] Figure 2B yes Figure 2A A schematic diagram of a circuit module of a medium current processing circuit;

[0051] Figure 3A This is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application;

[0052] Figure 3B yes Figure 3AA schematic diagram of a circuit module of a medium current processing circuit;

[0053] Figure 4A This is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application;

[0054] Figure 4B This is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the third embodiment of the present application;

[0055] Figure 4C This is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the third embodiment of the present application;

[0056] Figure 4D This is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the third embodiment of the present application;

[0057] Figure 5A This is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the fourth embodiment of the present application;

[0058] Figure 5B This is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the fourth embodiment of the present application;

[0059] Fig. 6A This is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the fifth embodiment of the present application;

[0060] Figure 6B This is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the fifth embodiment of the present application.

[0061] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0063] The terms "including" and "having" and any variations thereof appearing in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or modules is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0064] In addition, the terms "first", "second" and "third" are used to distinguish different objects, rather than to describe a specific order. The electrical connection of the present application includes direct electrical connection and indirect electrical connection. Indirect electrical connection means that other electronic components, pins, etc. may exist between the two electrically connected components. The XX end mentioned in the present application may be an actual terminal, or it may not be an actual terminal, for example, it is only one end of a component or one end of a wire. The "and / or" mentioned in the present application includes three situations. For example, A and / or B includes three situations: A, B, A and B.

[0065] In recent years, with the rapid growth of the automobile market, especially the explosion of the electric vehicle market, such as the electric passenger car market and the electric commercial vehicle market, the demand for automotive electronic components has increased. The most demanded electronic component in automobiles is the relay, which is used to turn on or off a load line. However, the relay itself has some disadvantages, such as long delay time for opening and closing, and the relay itself is expensive and large in size. Therefore, with the development of semiconductor technology, intelligent electronic switches have been successfully developed to replace traditional relays. Intelligent electronic switches are usually used to couple loads with batteries. They have one or more diagnostic capabilities and protection features, such as protection against over-temperature, overload and short-circuit events. For example, there is a power switch in the intelligent electronic switch. In the event of over-temperature, overload or short-circuit, the power switch will be turned off, so that the path between the battery and the load is disconnected.

[0066] It is understandable that in practical applications, the load types of intelligent electronic switches are diverse (for example, inductance, capacitance, resistance or a combination of the three) and the working environment is harsh, so the application end has particularly high requirements for its reliability.

[0067] Among them, the short-circuit protection of the intelligent electronic switch is a relatively important item in the reliability requirement. When the load connected to the power switch is short-circuited and the power switch is turned on, an uncontrollable current will flow from the battery through the power switch to the ground. At this time, the current flowing through the power switch is too large, resulting in the power switch being subjected to excessive instantaneous short-circuit power, which may cause the power switch to burn out.

[0068] In the related art, in order to prevent the power switch from being burned, the intelligent electronic switch can turn off the power switch through the over-temperature protection mechanism when the power switch is over-temperature, over-current, load short-circuited, etc., so as to protect the power switch. However, in actual applications, when a fault such as a load short-circuit occurs, when the over-temperature protection mechanism is used, since the current when the power switch is turned on again may still be large, it is very likely that the power switch will be turned on and off frequently, resulting in performance degradation of the power switch and reducing the reliability of the intelligent electronic switch.

[0069] Therefore, in response to the above technical problems, the inventors of the present application have discovered through research that when a load short circuit occurs, the current on the power switch will increase rapidly, and as the current increases, the possibility of the power switch being burned out increases. Therefore, the present application proposes a new technical concept, which can determine the shutdown timing of the power switch based on the output current of the power switch, and can also determine the corresponding short-circuit limiting current based on the output current before the power switch is shut down, so as to limit the maximum output current when the power switch is turned on again. This solution can not only quickly identify load short circuits and reduce the risk of damage to the power switch, but also increase the number of times the power switch can withstand the start and shutdown, thereby improving the reliability of the intelligent electronic switch when the load is short-circuited.

[0070] Based on the above technical concept, an embodiment of the present application provides an intelligent electronic switch, which obtains the output current of the power switch and outputs the main current signal through the current detection circuit. The current processing circuit outputs a shutdown signal when it is determined that the main current signal meets the preset conditions, so that the control circuit can output a cutoff control signal to enable the drive regulation circuit to control the power switch to be shut down, so that the power switch can be quickly shut down. Thereafter, the current processing circuit also outputs a drive limiting signal according to the main current signal before the power switch is shut down. In this way, after the control circuit receives the drive limiting signal, the maximum output current of the power switch can be limited based on the drive limiting signal when the power switch is turned on again, thereby effectively reducing the maximum heating power that the power switch can reach when it is turned on, improving the tolerance of the power switch when it is repeatedly turned on and off, reducing the risk of performance degradation of the power switch, and improving the reliability of the power switch in a short-circuit state.

[0071] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0072] This embodiment provides an intelligent electronic switch, which can handle load short circuit to protect the power switch from being damaged. Figure 1 1 is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the first embodiment of the present application. Figure 1 As shown, the intelligent electronic switch 20 may include a power supply terminal VBAT, a power ground terminal GND, a load output terminal OUT, a power switch Q1, a current detection circuit 21, a current processing circuit 22, a control circuit 23 and a drive regulation circuit 24. The power supply terminal VBAT and the power ground terminal GND are used to connect to the battery 10, and the load output terminal OUT is used to connect to the load 30.

[0073] In this embodiment, the power switch Q1 is used to be connected in series with the load 30, with its first end connected to the power supply terminal VBAT or the power ground terminal GND, its second end connected to the load output terminal OUT, and its control end g connected to the drive regulation circuit 24, which is used to control the power switch Q1 to turn on or turn off. In a possible design, Figure 1 In the embodiment, the first end of the power switch Q1 is connected to the power supply terminal VBAT. In this case, the power switch Q1 is connected as a high-side switch, which is a switch connected between the power supply terminal VBAT and the load 30. In other possible designs of the present application, the first end of the power switch Q1 is connected to the power ground terminal GND. In this case, the power switch Q1 is connected as a low-side switch, which is a switch connected between the power ground terminal GND and the load 30.

[0074] Continue to refer to Figure 1 As shown, the current detection circuit 21 is connected to the current processing circuit 22, the current processing circuit 22 is also connected to the control circuit 23, the control circuit 23 is also connected to the drive regulation circuit 24, and the current detection circuit 21 is used to obtain the output current of the power switch Q1 and output the main current signal Ids.

[0075] In this embodiment, the protection of the power switch Q1 by the intelligent electronic switch 20 can be divided into two processes. In the first process, the current processing circuit 22 outputs a shutdown signal off when it is determined that the main current signal Ids meets the preset condition, and the control circuit 23 outputs a cutoff control signal when receiving the shutdown signal off, so that the drive adjustment circuit 24 controls the power switch Q1 to be turned off; in the second process, the current processing circuit 22 is also used to output a drive limit signal limit according to the main current signal Ids before the power switch Q1 is turned off, and the control circuit 23 receives the drive limit signal limit, and limits the maximum output current of the power switch Q1 based on the drive limit signal limit when the power switch Q1 is turned on again.

[0076] Optionally, in this embodiment, the current detection circuit 21 can collect the output current of the power switch Q1 and output the main current signal Ids. The current processing circuit 22 is the core structure of the intelligent electronic switch. On the one hand, the current processing circuit 22 can determine whether the output current of the power switch Q1 is abnormal according to the received main current signal Ids, and output the shutdown signal off when it is determined that the output current of the power switch Q1 is abnormal, so that the control circuit 23 can shut down the power switch Q1 through the drive adjustment circuit 24; on the other hand, when the current processing circuit 22 determines that the output current of the power switch Q1 is abnormal, it can also generate and output the drive limit signal limit according to the main current signal Ids before the power switch Q1 is shut down, so that when the power switch Q1 is turned on again, the control circuit 23 can limit the maximum output current of the power switch Q1 based on the drive limit signal limit, thereby reducing the output current of the power switch Q1 after it is turned on again, reducing the abnormal risk of the output current of the power switch Q1, reducing the maximum heating power that the power switch Q1 can reach when it is turned on, and improving the number of switching times that the power switch can withstand.

[0077] In the embodiment of the present application, the intelligent electronic switch can also be externally connected to a microprocessor, and control the switch state of the power switch Q1 based on the drive control signal (Input signal) received from the microprocessor. For example, when the control circuit 23 receives the drive control signal but does not receive the shutdown signal off, it can control the power switch Q1 to turn on or turn off via the drive adjustment circuit 24 according to the drive control signal, and when the shutdown signal off is received, it can shield the received drive control signal limit, and control the power switch Q1 to turn off via the drive adjustment circuit 24 based on the shutdown signal off.

[0078] Optionally, in this embodiment, the power switch Q1 may be an N-type metal-oxide-semiconductor field-effect transistor (N Metal-Oxide-Semiconductor Field-Effect Transistor, NMOS FET, referred to as NMOS tube), a PMOS tube, a junction field effect transistor (Junction Field Effect Transistor, referred to as JFET) or an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, referred to as IGBT), etc., and the power switch Q1 is illustrated as an NMOS tube as an example. In another possible design of this embodiment, the power switch Q1 may also be implemented as a silicon device, or may be implemented using other semiconductor materials, such as silicon carbide (SiC), gallium arsenide (GaAs) or gallium nitride (GaN), etc., and the embodiment of the present application does not limit the form of expression of the power switch Q1.

[0079] For example, Figure 1 As shown, if the power switch Q1 is an NMOS tube, at this time, the first end of the power switch Q1 is the drain d of the NMOS tube, and the second end of the power switch Q1 is the source s of the NMOS tube. Optionally, when the power switch Q1 is a PMOS tube, the first end of the power switch Q1 is the source s of the PMOS tube, and the second end of the power switch Q1 is the drain d of the PMOS tube.

[0080] It can be understood that in this embodiment, no matter the power switch Q1 is turned on when the load 30 is short-circuited, or the load 30 is short-circuited when the power switch Q1 is turned on, the current processing circuit 22 can determine that the output current of the power switch Q1 is abnormal based on the received main current signal Ids and output the shutdown signal off, so that the control circuit 23 can quickly shut down the power switch Q1 to protect the power switch Q1 from being damaged. At the same time, the current processing circuit 22 can also output the drive limit signal limit when determining that the current is abnormal, so that the control circuit 23 can limit the output current of the power switch Q1 based on the drive limit signal limit when controlling the power switch Q1 to turn on again. In the scenario where the load 30 is short-circuited, the time from the power switch Q1 being turned on again to being turned off again is extended, the switch tolerance of the power switch is improved, and the reliability of the power switch under the load short-circuit state is improved.

[0081] The intelligent electronic switch provided in the embodiment of the present application utilizes a current detection circuit to obtain the output current of the power switch and output a main current signal, and determines whether the main current signal meets a preset condition through a current processing circuit. If so, a shutdown signal is output, so that the control circuit outputs a cutoff control signal when receiving the shutdown signal, so that the drive regulation circuit controls the power switch to be shut down and cut off. Thereafter, the current processing circuit further outputs a drive limiting signal according to the main current signal before the power switch is shut down and cut off, so that when the power switch is turned on again, the control circuit can limit the maximum output current of the power switch based on the received drive limiting signal. In this way, when the power switch is shut down and cut off due to load short circuit or other reasons, the output current of the power switch when it is turned on again can be reduced, which effectively reduces the risk of overcurrent and overheating of the power switch, improves the tolerance of the power switch when it is repeatedly turned on and off, and reduces the risk of performance degradation of the power switch.

[0082] Optionally, a fuse 40 may be connected in series between the battery 10 and the power supply terminal VBAT to prevent a fault caused by excessive current in the line. Other components may be provided between the power ground terminal GND and the negative electrode of the battery 10, for example, a reverse connection prevention diode and a current limiting resistor connected in parallel to improve the stability of the intelligent electronic switch.

[0083] Optional, in Figure 1 In the schematic diagram shown, the connection relationship between the current detection circuit 21, the current processing circuit 22, the control circuit 23, the drive regulation circuit 24, etc. and the power supply unit is not shown, but in actual application, a power supply unit can be set inside the intelligent electronic switch 20, and the internal power supply unit is connected to the power supply terminal VBAT to step down the voltage of the power supply terminal VBAT and provide it to the current detection circuit 21, the current processing circuit 22, the control circuit 23, the drive regulation circuit 24 and other circuits. In other embodiments, the power supply unit may not be set inside the intelligent electronic switch 20, and the positive electrode of the battery 10 is also connected to the step-down unit, which outputs the stepped-down voltage to the intelligent electronic switch 20 to power the circuit inside the intelligent electronic switch 20.

[0084] The above embodiment provides a general introduction to the intelligent electronic switch 20. The following will explain the specific implementation of the current processing circuit 22, the control circuit 23, the drive regulation circuit 24 and the current detection circuit 21 in the intelligent electronic switch 20 through different embodiments. Figure 1 The principle is explained based on the illustrated embodiment (the power switch Q1 is an NMOS tube and is connected as a high-side switch). The implementation principles of application scenarios such as the power switch Q1 is an NMOS tube and is connected as a low-side switch, the power switch Q1 is a PMOS tube and is connected as a high-side or low-side switch are similar and will not be elaborated in this embodiment.

[0085] In an embodiment of the present application, the current processing circuit 22 can control the power switch Q1 to be turned off when the main current signal Ids is detected to be abnormal, and can determine the drive limit signal limit based on the main current signal Ids before the power switch Q1 is turned off, so as to limit the maximum output current of the power switch Q1 when the power switch Q1 is turned on again. Optionally, the current processing circuit 22 can determine the drive limit signal limit (for example, short-circuit limit current) based on the current threshold that triggers the power switch Q1 to turn off, or can determine the drive limit signal limit based on the maximum current threshold reached before the power switch Q1 is turned off. The following is explained through specific embodiments.

[0086] In a possible design, the current processing circuit 22 is further used to generate a first coding signal. When the first coding signal meets a preset condition, the current processing circuit 22 also generates a shutdown signal off and synchronously determines a drive limit signal limit according to the first coding signal.

[0087] For example, Figure 2A Schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the second embodiment of the present application. Figure 2A As shown, in the intelligent electronic switch provided in this embodiment, the current processing circuit 22 includes a threshold determination unit 221 , an abnormality judgment unit 222 and a current limiting unit 223 .

[0088] Among them, one end of the threshold determination unit 221 is connected to the current detection circuit 21, and the other end is connected to the abnormality judgment unit 222. The abnormality judgment unit 222 is also connected to the current limiting unit 223 and the control circuit 23 respectively. The current limiting unit 223 is also connected to the control circuit 23.

[0089] In an embodiment of the present application, the threshold determination unit 221 is used to generate a second coding signal corresponding to the main current signal Ids, and the abnormal judgment unit 222 generates a first coding signal based on the second coding signal, and outputs the first coding signal to the current limiting unit 223. When the first coding signal meets the preset conditions, the abnormal judgment unit 222 outputs the shutdown signal off and the current limiting unit 223 determines the drive limit signal limit according to the first coding signal.

[0090] Exemplarily, multiple current thresholds of the main current signal Ids can be preset in the threshold determination unit 221. The main current signal Ids can be characterized by voltage, current, etc., and the current threshold can characterize the applied voltage, current, etc., for example, thresholds corresponding to 60A, 80A, 100A, etc., so that after receiving the main current signal Ids, the threshold determination unit 221 can generate a corresponding second coding signal based on the size of the main current signal Ids, and the second coding signal can characterize the current threshold at which the output current of the power switch Q1 is located.

[0091] Optionally, the abnormality judgment unit 222 can process the second coded signal based on different abnormality judgment criteria to generate a first coded signal and output the first coded signal to the current limiting unit 223 in real time. On the one hand, when the abnormality judgment unit 222 determines that the first coded signal meets the preset condition, it can output the shutdown signal off. On the other hand, when the current limiting unit 223 determines that the first coded signal meets the preset condition, it can determine the driving limit signal limit according to the first coded signal.

[0092] Exemplarily, when the current threshold of the main current signal Ids preset in the threshold determination unit 221 is N, the second coding signal and the first coding signal are both N-bit coding signals, that is, both contain N level signals arranged in sequence, where N is an integer greater than or equal to 2.

[0093] As a possible design, Figure 2B yes Figure 2A A circuit module schematic diagram of a current processing circuit in FIG. Figure 2B As shown, in this embodiment, the threshold determination unit 221 includes N current comparison units (IP1 to IPN), the abnormality judgment unit 222 includes (N-1) timing units (the 1st timing unit to the (N-1)th timing unit), (N-1) timing comparison units (TP1 to TP(N-1)) and an abnormality determination unit 2220.

[0094] Reference Figure 2BAs shown, the first input ends of the N current comparison units (IP1 to IPN) are all connected to the current detection circuit 21, the second input ends of the N current comparison units (IP1 to IPN) are correspondingly connected to N current thresholds (Ith 1 to Ith N) that increase in sequence, the output ends of the N current comparison units (IP1 to IPN) are correspondingly connected to the input ends of the (N-1) timing units and the abnormality determination unit 2220, the output ends of the (N-1) timing units are correspondingly connected to the first input ends of the (N-1) timing comparison units (TP1 to TP(N-1)), the second input ends of the (N-1) timing comparison units (TP1 to TP(N-1)) are correspondingly connected to (N-1) duration threshold information (Tth 1 to Tth(N-1)) that decreases in sequence, and the output ends of the (N-1) timing comparison units (TP1 to TP(N-1)) are all connected to the abnormality determination unit 2220. That is, in the embodiment of the present application, Ith N>Ith(N-1)>…>Ith1, Tth(N-1)<Tth(N-2)> … <Tth 1。

[0095] In this embodiment, N current comparison units (IP1 to IPN) compare the main current signal Ids with N current thresholds (Ith 1 to Ith N) respectively, and output a first level signal when the main current signal Ids is greater than or equal to the corresponding current threshold, and output a second level signal when the main current signal Ids is less than the corresponding current threshold. The N-bit level signals output by the N current comparison units (IP1 to IPN) form a second coded signal corresponding to the main current signal Ids.

[0096] The (N-1) timing units all start timing when receiving a first level signal, and continuously output timing information during the timing process or output timing information when receiving a second level signal. The (N-1) timing comparison units (TP1 to TP(N-1)) correspondingly compare the timing information of the (N-1) timing units with the (N-1) duration threshold information (Tth 1 to Tth(N-1)), and output a third level signal when the timing information is greater than or equal to the corresponding duration threshold information, and output a fourth level signal when the timing information is less than the corresponding duration threshold information. The level signal output by the Nth current comparison unit and the (N-1) level signal output by the (N-1) timing comparison unit form a first coded signal.

[0097] Correspondingly, in this embodiment, the above-mentioned preset condition is that there is a first level signal or a third level signal in the first coded signal.

[0098] Continue to refer to Figure 2BAs shown, the output end of the Nth current comparison unit IPN and the output end of the (N-1)th timing comparison unit (TP1 to TP(N-1)) are not only connected to the abnormality determination unit 2220, but also connected to the current limiting unit 223, that is, the abnormality determination unit 2220 and the current limiting unit 223 can receive the first coding signal at the same time.

[0099] Exemplarily, if the first input terminals of N current comparison units are all in-phase terminals, and the second input terminals are all inverting terminals, then the N current comparison units output low-level signals when the main current signal Ids is less than the corresponding current threshold, and output high-level signals when the drain-source voltage signal Ids is greater than or equal to the corresponding current threshold, thus, in this embodiment, the first-level signal is a high-level signal, and the second-level signal is a low-level signal. Accordingly, the N-level signals output by the N current comparison units (IP1 to IPN) based on the comparison results are the second coded signals.

[0100] Similarly, if the first input terminals of (N-1) timing comparison units are all in-phase terminals and the second input terminals are all inverting terminals, then the (N-1) timing comparison units can compare the received timing information with the corresponding duration threshold information, and output a high-level signal when the timing information is greater than or equal to the corresponding duration threshold information, and output a low-level signal when the timing information is less than the corresponding duration threshold information. That is, in this embodiment, the third level signal is a high-level signal, and the fourth level signal is a low-level signal. Accordingly, the level signal output by the Nth current comparison unit and the (N-1) level signals output by the (N-1) timing comparison units form a first coded signal.

[0101] It can be understood that in this embodiment, although the first level signal and the third level signal are both high level signals, and the second level signal and the fourth level signal are both low level signals, the level values ​​of the two high levels may be different, and the level values ​​of the two low levels may also be different, and this application does not limit this.

[0102] In this embodiment, the Nth current threshold Ith N can be interpreted as an overcurrent protection threshold. Once the main current signal Ids is greater than or equal to Ith N, the Nth current comparison unit IPN outputs a first level signal, so that the first level signal exists in the first coding signal. At this time, the abnormality determination unit 2220 can directly output the shutdown signal off, and accordingly, the current limiting unit 223 can also determine the corresponding drive limit signal limit according to the first coding signal, wherein the corresponding relationship between the first coding signal and the drive limit signal limit is preset in the current limiting unit 223. For example, assuming that the overcurrent protection threshold (i.e., the Nth current threshold Ith N) is a threshold corresponding to 100A, the output limit current of the power switch Q1 corresponding to the drive limit signal limit can be 25A.

[0103] Optionally, when there is a first level signal in the level signal outputted by the first current comparison unit to the (N-1)th current comparison unit based on the comparison result, the first level signal also needs to be processed by the timing unit and the timing comparison unit, and only when the duration of the first level signal is greater than or equal to the corresponding duration threshold information, the timing comparison unit outputs a third level signal, so that there is a third level signal in the first coded signal, at this time, the abnormality determination unit 2220 can directly output the shutdown signal off, and accordingly, the current limiting unit 223 can also determine the corresponding drive limit signal limit according to the first coded signal. For example, assuming that the level signal corresponding to the (N-1)th current threshold Ith(N-1) in the first coded signal is the third level signal, and the (N-1)th current threshold Ith(N-1) represents 80A, then the output limit current of the power switch Q1 corresponding to the determined drive limit signal limit can be 20A, and the (N-2)th current threshold Ith(N-2) can represent 60A, then the output limit current of the power switch Q1 corresponding to the determined drive limit signal limit can be 15A.

[0104] It can be understood that the relationship between the current threshold connected to each current comparison unit and the output limiting current corresponding to the drive limiting signal limit can be set according to actual needs, for example, 4 to 7 times, that is, if the current threshold represents 60A, the output limiting current of the power switch Q1 corresponding to the determined drive limiting signal limit can also be 12A, 10A, etc., but for each current threshold, its output limiting current must be at least greater than the output current when the power switch Q1 is normally turned on or a multiple of the output current.

[0105] In this possible design, the current processing circuit 22 determines the drive limit signal limit based on the first coding signal that causes the power switch Q1 to be turned off, which can limit the maximum output current of the power switch Q1 when the power switch Q1 is turned on again, effectively avoiding the problem of damage to the power switch Q1 caused by the output current of the power switch Q1 being too large rapidly.

[0106] In another possible design, the current processing circuit 22 is also used to obtain a second coding signal, which corresponds to the main current signal Ids. When the main current signal Ids meets a preset condition, the current processing circuit 22 determines a target coding signal based on all the acquired second coding signals, and determines a drive limit signal limit based on the target coding signal, wherein the target coding signal is used to characterize the maximum current threshold reached before the power switch Q1 is turned off.

[0107] For example, Figure 3AThis is a circuit module schematic diagram of an intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application. Figure 3A The intelligent electronic switch shown is Figure 2A The structure of the intelligent electronic switch shown is similar, that is, Figure 3A As shown, in the intelligent electronic switch provided in this embodiment, the current processing circuit 22 includes a threshold determination unit 221, an abnormality judgment unit 222 and a current limiting unit 223. Figure 3A and Figure 2A The difference lies in that the connection relationship between the current limiting unit 223 and other units is different.

[0108] Specifically, in Figure 3A In the figure, one end of the threshold determination unit 221 is connected to the current detection circuit 21, and the other end is connected to the abnormal judgment unit 222 and the current limiting unit 223. The abnormal judgment unit 222 is also connected to the current limiting unit 223 and the control circuit 23 respectively, and the current limiting unit 223 is also connected to the control circuit 23.

[0109] In an embodiment of the present application, the threshold determination unit 221 is used to generate a second coding signal corresponding to the main current signal Ids, and the abnormal judgment unit 222 generates a first coding signal based on the second coding signal. When the first coding signal meets a preset condition, the abnormal judgment unit 222 outputs a shutdown signal off, and the current limiting unit 223 is also used to receive the second coding signal, and when the current limiting unit 223 receives the shutdown signal off, it determines the target coding signal based on all the received second coding signals, and determines the drive limit signal limit based on the target coding signal.

[0110] It can be understood that in the embodiment of the present application, the implementation method in which the threshold determination unit 221 generates the second coded signal corresponding to the main current signal Ids and the abnormality judgment unit 222 generates the first coded signal based on the second coded signal is the same as Figure 2A Similar to the above, please refer to the above Figure 2A The description in the illustrated embodiment will not be repeated here.

[0111] Figure 3A and Figure 2A The difference is that in Figure 2A In the embodiment, the current limiting unit 223 is connected to the abnormality judging unit 222, and can receive the intermediate signal processed by the abnormality judging unit 222. Figure 3AIn the figure, it is clearly defined that the current limiting unit 223 is connected to the output end of the threshold determination unit 221 (the input end of the abnormal judgment unit 222) and the output end of the abnormal judgment unit 222. The current limiting unit 223 can obtain the second coding signal output by the threshold determination unit 221, and can also receive the output signal of the abnormal judgment unit 222. Specifically, the abnormal judgment unit 222 generates a first coding signal according to the second coding signal and outputs a shutdown signal off when it is determined that the first coding signal meets the preset condition. Accordingly, when the current limiting unit 223 receives the shutdown signal off, it can analyze all the received second coding signals to determine the target coding signal therefrom, and the target coding signal is used to characterize the maximum current threshold reached before the power switch Q1 is turned off.

[0112] Optionally, in this embodiment, Figure 2B Similarly, N current thresholds of the main current signal Ids can also be preset in the threshold determination unit 221. In this case, the second coding signal and the first coding signal are both N-bit coding signals, that is, both contain N level signals arranged in sequence, where N is an integer greater than or equal to 2.

[0113] As a possible design, Figure 3B yes Figure 3A A circuit module schematic diagram of a current processing circuit in FIG. Figure 3B As shown, in this embodiment, the threshold determination unit 221 includes N current comparison units (IP1 to IPN), the abnormality judgment unit 222 includes (N-1) timing units, (N-1) timing comparison units (TP1 to TP(N-1)) and an abnormality determination unit 2220, where N is an integer greater than or equal to 2.

[0114] exist Figure 3BIn the structural schematic diagram shown in , the first input ends of the N current comparison units (IP1 to IPN) are all connected to the current detection circuit 21, the second input ends of the N current comparison units (IP1 to IPN) are correspondingly connected to the N current thresholds (Ith 1 to Ith N) that increase in sequence, the output ends of the N current comparison units (IP1 to IPN) are correspondingly connected to the input ends of the (N-1) timing units and the abnormality determination unit 2220, the output ends of the (N-1) timing units are correspondingly connected to the first input ends of the (N-1) timing comparison units (TP1 to TP(N-1)), the second input ends of the (N-1) timing comparison units are correspondingly connected to the (N-1) duration threshold information (Tth 1 to Tth(N-1)) that decreases in sequence, and the output ends of the (N-1) timing comparison units (TP1 to TP(N-1)) are all connected to the abnormality determination unit 2220. Wherein, N current comparison units (IP1 to IPN) compare the main current signal Ids with N current thresholds, output a first level signal when the main current signal Ids is greater than or equal to the corresponding current threshold, and output a second level signal when the main current signal Ids is less than the corresponding current threshold. The N-bit level signals output by the N current comparison units form a second coded signal corresponding to the main current signal Ids; (N-1) timing units all start timing when receiving the first level signal, and continuously output timing information during the timing process or output timing information when receiving the second level signal; (N-1) timing comparison units compare the timing information of the (N-1) timing units with (N-1) duration threshold information, output a third level signal when the timing information is greater than or equal to the corresponding duration threshold information, and output a fourth level signal when the timing information is less than the corresponding duration threshold information; the level signal output by the Nth current comparison unit and the (N-1) level signal output by the (N-1) timing comparison unit form a first coded signal; wherein the preset condition is that the first level signal or the third level signal exists in the first coded signal.

[0115] In this embodiment, due to Figure 3B The threshold determination unit 221 and the abnormality determination unit 222 shown in FIG. Figure 2B The structure and implementation principle of the threshold determination unit 221 and the abnormality judgment unit 222 shown in FIG. are similar, and the details can be referred to above. Figure 2B The records in the article are not repeated here.

[0116] Optional, continue to refer to Figure 3BAs shown, the output ends of the N current comparison units (IP1 to IPN) are also connected to the input end of the current limiting unit 223, and the output end of the abnormality determination unit 2220 is also connected to the current limiting unit 223. In this embodiment, the current limiting unit 223 can continuously receive the N level signals output by the N current comparison units (IP1 to IPN), that is, the second coding signal, and when the current limiting unit 223 receives the shutdown signal off from the abnormality determination unit 222, it analyzes all the received second coding signals, selects the target coding signal that can characterize the maximum current threshold that the power switch Q1 can reach before the shutdown is cut off, and then determines the driving limit signal limit based on the target coding signal. That is, in this example, when the shutdown signal off is not received, the current limiting unit 223 can also receive the second coding signal and store it, but does not process it. The stored second coding signal is processed only when the shutdown signal off is received.

[0117] In this embodiment, the Nth current threshold IthN can be interpreted as an overcurrent protection threshold. When the Nth current comparison unit IPN outputs a first level signal, a first level signal will exist in the first coding signal. At this time, the abnormality determination unit can directly output the shutdown signal off. Correspondingly, when the current limiting unit 223 receives the shutdown signal off, it can determine the drive limit signal limit based on all the second coding signals received from the N current comparison units.

[0118] Optionally, a correspondence between the second coding signal and the driving limit signal limit is preset in the current limiting unit 223. For example, the highest bit of the second coding signal represents 100A for the corresponding overcurrent protection threshold (i.e., the Nth current threshold IthN), and the output limit current of the power switch Q1 corresponding to the driving limit signal limit may be 25A, and the (N-1)th current threshold Ith(N-1) corresponding to the second highest bit of the second coding signal represents 80A, and the output limit current of the power switch Q1 corresponding to the driving limit signal limit determined at this time may be 20A, etc.

[0119] It can be understood that the relationship between the current threshold connected to each current comparison unit and the output limit current corresponding to the drive limit signal limit can be set according to actual needs, which will not be elaborated here.

[0120] In this possible design, the current processing circuit determines the drive limit signal based on the maximum output current threshold reached before the power switch is turned off, which can limit the maximum output current of the power switch when the power switch is turned on again, and can more accurately protect the power switch from being damaged.

[0121] It can be understood that in another possible design of the present application, the shutdown signal off can be used as an enable signal of the current limiting unit 223, that is, the current limiting unit 223 can start working when the shutdown signal off is received, that is, collect the second coding signals (N level signals) output by N current comparison units, and determine the drive limit signal limit based on the second coding signal. The implementation logic of this method is simpler and can also achieve the purpose of protecting the power switch Q1 from being damaged.

[0122] Understandably, about Figure 3A and Figure 3B For the contents not detailed in the above, please refer to the records in the above embodiments, which will not be repeated here.

[0123] Optionally, in the embodiment of the present application, the control circuit 23 not only receives the shutdown signal off and the drive limit signal limit output by the current processing circuit 22, but also receives the drive control signal (sent by a microprocessor or other device). When the signals received by the control circuit 23 are different, the control result of the power switch Q1 via the drive adjustment circuit 24 may be different. The module composition and implementation principle of the control circuit 23 are explained below through specific embodiments.

[0124] For example, Figure 4A Schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application. Figure 4A As shown, in the intelligent electronic switch provided in this embodiment, the control circuit 23 includes a drive control subcircuit 231 and a current limiting output subcircuit 232 .

[0125] Among them, the first input end of the drive control subcircuit 231 is used to access the drive control signal (Input signal), the second input end of the drive control subcircuit 231 and one end of the current limiting output subcircuit 232 are both connected to the current processing circuit 22, and the output end of the drive control subcircuit 231 and the other end of the current limiting output subcircuit 232 are both connected to the drive regulation circuit 24.

[0126] In this embodiment, the drive control subcircuit 231 shields the drive control signal and outputs the cutoff control signal when receiving the shutdown signal off, so that the drive regulation circuit 24 controls the power switch Q1 to be turned off and cut off. The current limiting output subcircuit 232 is used to output the received drive limit signal limit when receiving the trigger signal, and the trigger signal is used to indicate that the power switch Q1 has been completely turned off.

[0127] It can be understood that in the embodiment of the application, the drive control signal Input is an on control signal ON or an off control signal OFF. As an example, when the power switch Q1 is in the on state, that is, during the period when the control circuit 23 receives the on control signal ON, if the load 30 connected to the power switch Q1 is suddenly short-circuited, the output current of the power switch Q1 will increase instantly, so that after the current processing circuit 22 receives the main current signal Ids from the current detection circuit 21, it will determine that the main current signal Ids meets the preset condition and output the off signal off. At the same time, the current processing circuit 22 can also determine the drive limit signal limit according to the main current signal Ids before the power switch Q1 is turned off. Correspondingly, in the control circuit 23, the drive control subcircuit 231 can respond to the off signal off. Regardless of whether the drive control signal is an on control signal or a off control signal, the drive control subcircuit 231 outputs a cut-off control signal to enable the drive adjustment circuit 24 to turn off the power switch Q1.

[0128] In addition, in the control circuit 23, the current limiting output subcircuit 232 can receive the driving limit signal limit, but will not respond immediately. Instead, it will output the driving limit signal limit when it receives the trigger signal, that is, when it is determined that the power switch Q1 has been completely turned off. In this way, the driving limit signal limit will not affect the switching state of the power switch Q1 before it is turned off, and it only limits the maximum output current of the power switch Q1 when the power switch Q1 is turned on again.

[0129] In the embodiment of the present application, the trigger signal can be generated in a variety of ways, that is, there are a variety of ways to detect whether the power switch Q1 is completely turned off. Figure 4A The generation principle of the trigger signal is explained based on the illustrated embodiment.

[0130] As an example, Figure 4B 1 is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the third embodiment of the present application. Figure 4B As shown, in this example, the intelligent electronic switch also includes a voltage detection circuit 25, and the control circuit 23 also includes a voltage judgment subcircuit 233; the two ends of the voltage detection circuit 25 are correspondingly connected to the control end of the power switch Q1 and the second end of the power switch Q1, and the voltage detection circuit 25 is used to detect the gate-source voltage of the power switch Q1 and output a gate-source voltage signal; the voltage judgment subcircuit 233, its first input end is connected to the voltage detection circuit 25, its second input end is used to access a preset voltage threshold, and its output end is connected to the current limiting output subcircuit 232, and the voltage judgment subcircuit 233 outputs a trigger signal when the gate-source voltage signal of the power switch Q1 is less than or equal to the preset voltage threshold.

[0131] In practical applications, the voltage detection circuit 25 is a gate-source voltage detection circuit of the power switch Q1, and its two ends are connected to the control end (gate) and the source of the power switch Q1, respectively, and the gate voltage and the source voltage of the power switch Q1 can be obtained, and the gate-source voltage signal of the power switch Q1 can be obtained based on the gate voltage and the source voltage. Since the gate-source voltage signal of the power switch Q1 is less than or equal to the preset voltage threshold, for example, equal to 0 when the power switch Q1 is in the off state, the voltage judgment subcircuit 233 can compare the received gate-source voltage signal with the preset voltage threshold, and when it is detected that the gate-source voltage signal is less than or equal to the preset voltage threshold, for example, Vgs=0, it is considered that the power switch Q1 has been completely turned off, and it can output a trigger signal at this time so that the current limiting output subcircuit 232 outputs the received drive limit signal limit.

[0132] As another example, Figure 4C FIG. 1 is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the third embodiment of the present application. Figure 4C As shown, in this example, the control circuit 23 further includes a current judgment subcircuit 234. The current judgment subcircuit 234 has a first input terminal connected to the current detection circuit 21 to access the main current signal Ids, a second input terminal for accessing the first preset threshold, and an output terminal connected to the current limiting output subcircuit 232. The current judgment subcircuit 234 outputs a trigger signal when the current characterization value of the main current signal Ids is less than or equal to the first preset threshold.

[0133] In this example, the current judgment subcircuit 234 can compare the current characterization value of the connected main current signal Ids with the first preset threshold. When it is determined that the current characterization value is less than or equal to the first preset threshold, it is considered that the power switch Q1 has been successfully turned off and a trigger signal can be output.

[0134] It can be understood that in practical applications, the current judgment subcircuit 234 can essentially be a voltage judgment circuit. In this case, the current characterization value of the main current signal Ids can be a voltage, and the first preset threshold is also a voltage threshold, that is, the current judgment subcircuit 234 can characterize the main current signal Ids as a voltage signal and then compare it with the first preset threshold, and then determine whether to output a trigger signal based on the comparison result.

[0135] As another example, Figure 4D FIG. 1 is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the third embodiment of the present application. Figure 4DAs shown, in this example, the control circuit 23 also includes a timing sub-circuit 235, one end of the timing sub-circuit 235 is connected to the drive control sub-circuit 231, and the other end of the timing sub-circuit 235 is connected to the current limiting output sub-circuit 232. The timing sub-circuit 235 starts timing when a cut-off control signal is received, and outputs a trigger signal when the timing information reaches the preset time information.

[0136] Optionally, in this embodiment, when the drive control subcircuit 231 outputs a cut-off control signal, it can be considered that the power switch Q1 has entered the shutdown process. At this time, the timing subcircuit 235 starts timing. When the timing information reaches the preset time information, it is considered that the shutdown process of the power switch Q1 has lasted for the preset time information, and thus it is considered that the power switch Q1 has been shut down, and then a trigger signal can be output.

[0137] It can be understood that in this example, the preset time information can be determined based on the historical time information required for the power switch Q1 to be turned off. Usually, the preset time information is greater than the average value of the historical time information required for the power switch Q1 to be turned off, but it is not limited to it.

[0138] exist FIG. 4B to FIG. 4D In the illustrated embodiment, it is determined in a variety of ways whether the power switch Q1 has been completely turned off. When it is determined that the power switch Q1 has been completely turned off, the current limiting output subcircuit 232 outputs a driving limit signal limit, so that the maximum output current of the power switch Q1 can be limited when the power switch Q1 is turned on again, thereby improving the tolerance of the power switch during repeated turning on and off, and improving the reliability of the intelligent electronic switch.

[0139] Optionally, in an embodiment of the present application, the drive regulating circuit 24 is not only used to control the power switch Q1 to be turned off when receiving the cut-off control signal, but also used to limit the maximum output current of the power switch Q1 when the power switch Q1 is turned on again after receiving the drive limit signal limit, so as to protect the power switch Q1 from being burned by a large current. The specific implementation of the drive regulating circuit 24 is explained below.

[0140] In one possible design, Figure 5A Schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the fourth embodiment of the present application. Figure 5AAs shown, in this example, the driving and regulating circuit 24 includes a charging unit 241, a charging switch M1, a discharging switch M2 and a regulating unit 242. The charging unit 241 is connected in series with the charging switch M1 to form a charging branch, one end of the charging branch is connected to the first power supply end, the other end of the charging branch is connected to the control end of the power switch Q1, the two ends of the discharging switch M2 are connected to the control end and the second end of the power switch Q1, the two ends of the regulating unit 242 are connected to the control end and the second end of the power switch Q1, the control end of the charging switch M1 and the control end of the discharging switch M2 are both connected to the driving control sub-circuit 231, and the regulating end of the regulating unit 242 is connected to the current limiting output sub-circuit 232.

[0141] In the embodiment of the present application, when the drive regulating circuit 24 receives the cut-off control signal, it controls the charging switch M1 to be turned off and the discharging switch M2 to be turned on, so as to cause the power switch Q1 to be turned off. When the drive regulating circuit 24 receives the start control signal, it controls the charging switch M1 to be turned on and the discharging switch M2 to be turned off, and adjusts the current flowing through the regulating unit 242 based on the received drive limit signal limit, so as to adjust the voltage of the control terminal of the power switch Q1, thereby limiting the maximum output current of the power switch Q1.

[0142] Optional, in Figure 5A In the figure, when the power switch Q1 is an NMOS tube and the power switch Q1 is connected as a high-side switch, the first power supply terminal is the output terminal of the boost circuit (not shown in the figure), and the input terminal of the boost circuit can be the power supply terminal VBAT. The main function of the boost circuit is to increase the voltage of the output terminal so that the driving regulation circuit 24 can normally drive the power switch Q1. Therefore, the voltage of the first power supply terminal is higher than the voltage of the power supply terminal VBAT. Exemplarily, the boost circuit can be a charge pump (CP) circuit. Figure 5A Of course, in other embodiments of the present application, the boost circuit may also be other types of circuits, and the present application does not limit its specific implementation, which may be determined according to actual needs.

[0143] exist Figure 5A In the illustrated embodiment, the cut-off control signal received by the driving and regulating circuit 24 will act on the charging switch M1 and the discharging switch M2, that is, the cut-off control signal received by the driving and regulating circuit 24 will control the charging switch M1 to be turned off, and control the discharging switch M2 to be turned on, so that the charging branch stops outputting the control signal to the control end of the power switch Q1. On the contrary, the voltage at the control end of the power switch Q1 will also be discharged through the discharging switch M2, thereby turning off the power switch Q1.

[0144] Correspondingly, when the power switch Q1 is completely turned off, the current processing circuit 22 stops outputting the off signal off, and the control circuit 23 controls the switch state of the power switch Q1 via the drive adjustment circuit 24 based on the received drive control signal. For example, after the power switch Q1 has been completely turned off, if the control circuit 23 receives the start control signal again, the control circuit 23 will output the start control signal to control the charging switch M1 to turn on and the discharging switch M2 to turn off. With the charging action of the charging circuit, the power switch Q1 is gradually turned on. Exemplarily, when the power switch Q1 is an NMOS, as the charging unit 241 continuously charges the control end of the power switch Q1, the voltage of the control end of the power switch Q1 continues to increase, and the output current of the power switch Q1 gradually increases. Normally, the control terminal voltage of the power switch Q1 is determined by the voltage of the first power supply terminal, but in this embodiment, the driving limit signal limit output by the current limiting output subcircuit 232 can act on the adjustment unit 242, so as to adjust the current flowing through the adjustment unit 242, and then adjust the voltage of the control terminal of the power switch Q1, so that the output current of the power switch Q1 is limited to below the maximum output current corresponding to the driving limit signal limit.

[0145] In another possible design, Figure 5B 1 is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the fourth embodiment of the present application. Figure 5B As shown, in this possible design, the driving and regulating circuit 24 includes a charging unit 241, a charging switch M1, a discharging switch M2 and a regulating unit 242. The charging unit 241 is connected in series with the charging switch M1 to form a charging branch, one end of the charging branch is connected to the first power supply end, the other end of the charging branch is connected to the control end of the power switch Q1, the two ends of the discharging switch M2 are connected to the control end and the second end of the power switch Q1, the two ends of the regulating unit 242 are connected to the first power supply end and the second end of the power switch Q1, the control end of the charging switch M1 and the control end of the discharging switch M2 are both connected to the driving control sub-circuit 231, and the regulating end of the regulating unit 242 is connected to the current limiting output sub-circuit 232.

[0146] In this possible design, when the drive regulation circuit 24 receives the cut-off control signal, it controls the charging switch M1 to be turned off and the discharging switch M2 to be turned on, thereby causing the power switch Q1 to be turned off; correspondingly, when the drive regulation circuit 24 receives the start-up control signal, it controls the charging switch M1 to be turned on and the discharging switch M2 to be turned off, and based on the received drive limit signal limit, the voltage of the first power supply end is adjusted through the adjustment unit 242 to adjust the voltage of the control end of the power switch Q1, thereby limiting the maximum output current of the power switch Q1.

[0147] Optional, with Figure 5A Similar to Figure 5B In the embodiment, when the power switch Q1 is an NMOS tube and the power switch Q1 is connected as a high-side switch, the first power supply terminal is the output terminal of the boost circuit (not shown in the figure), and the first power supply terminal is marked with CP. Figure 5B In the illustrated embodiment, the cut-off control signal received by the driving regulating circuit 24 acts on the charging switch M1 and the discharging switch M2, so that the charging switch M1 is turned off and the discharging switch M2 is turned on, and finally the voltage at the control end of the power switch Q1 is discharged through the discharging switch M2, so as to achieve the purpose of turning off the power switch Q1.

[0148] Similarly, when the power switch Q1 is completely turned off, the current processing circuit 22 stops outputting the off signal off, and the control circuit 23 controls the switch state of the power switch Q1 via the drive adjustment circuit 24 based on the received drive control signal, and the maximum output current of the power switch Q1 is also limited by the drive limit signal limit. For example, after the power switch Q1 has been completely turned off, if the control circuit 23 receives the start control signal again, the control circuit 23 will output the start control signal to control the charging switch M1 to turn on and the discharging switch M2 to turn off. With the charging action of the charging circuit, the power switch Q1 is gradually turned on.

[0149] In this embodiment, when the power switch Q1 is an NMOS, as the charging unit 241 continuously charges the control end of the power switch Q1, the voltage of the control end of the power switch Q1 continuously increases, and the output current of the power switch Q1 gradually increases. The voltage outputted from the driving regulating circuit 24 to the control end of the power switch Q1 is determined by the voltage of the first power supply end. Since the regulating unit 242 is connected between the first power supply end and the second end of the power switch Q1, the voltage of the first power supply end is related to the voltage on the regulating unit 242. The larger the voltage on the regulating unit 242, the higher the voltage of the first power supply end. Conversely, the smaller the voltage on the regulating unit 242, the lower the voltage of the first power supply end. Since the regulating end of the regulating unit 242 is controlled by the driving limiting signal limit, when the driving limiting signal limit limits the maximum voltage of the regulating unit 242, the voltage of the first power supply end is also limited, so that the voltage outputted from the driving regulating unit 242 to the control end of the power switch Q1 is limited, thereby limiting the maximum output current of the power switch Q1.

[0150] Understandably, Figure 5A and Figure 5BIn the illustrated embodiment, when the power switch Q1 is a PMOS tube and is connected as a high-side switch, or when the power switch Q1 is an NMOS tube and is connected as a low-side switch, the first power supply terminal may be an internal power supply terminal having the same potential as the power supply terminal VBAT.

[0151] Optional, Figure 5A and Figure 5B In the embodiment shown, the discharge branch includes the discharge switch M2 for exemplary description. In other embodiments of the present application, the discharge branch may also include a discharge unit, which is connected in series with the discharge switch M2 and is used to control the speed at which the power switch Q1 is turned off, which is not described in detail here.

[0152] Optional, in the above Figure 5A and / or Figure 5B In the illustrated embodiment, the adjustment unit 242 includes any one of the following:

[0153] A variable current source, a variable resistor, a switch tube, and a switch tube and a resistor connected in series.

[0154] For example, when the adjustment unit 242 is implemented by a variable current source (or a voltage-controlled current source), the current of the branch where the variable current source is located can be adjusted based on the drive limit signal limit. The larger the drive limit signal limit is, the larger the current flowing through the variable current source is. When the adjustment unit 242 is implemented by a variable resistor, the resistance of the variable resistor can be adjusted based on the drive limit signal limit. For example, the larger the drive limit signal limit is, the larger or smaller the resistance of the variable resistor is, which can be set according to actual needs. When the adjustment unit 242 is implemented by a switch tube, the switch tube can be a field effect tube, a triode or other switch tube, and the opening size of the switch tube is determined by the type of the switch tube and the received drive limit signal limit, thereby adjusting the voltage flowing through the two ends of the switch tube. When the adjustment unit 242 is implemented by a switch tube and a resistor connected in series, the resistor can be a fixed resistor or a variable resistor. This embodiment does not limit it. When the resistor is a fixed resistor, the switch tube is turned on or off or the opening size is determined by the drive limit signal limit.

[0155] Optionally, the embodiment of the present application does not limit the specific composition and implementation form of the adjustment unit 242. Any method is acceptable as long as the control signal output to the control end of the power switch Q1 can be adjusted according to the driving limit signal limit, and they are not listed here one by one.

[0156] Understandable, Figure 5A and Figure 5B The illustrated embodiment is only a further explanation of the driving and regulating circuit 24. For other parts not described in this embodiment, reference may be made to the description in the above embodiment, and no further description will be given here.

[0157] Optionally, based on the above embodiments, the present application may further explain the specific form of the current detection circuit 21 .

[0158] As an example, Fig. 6A 1 is a schematic diagram of a circuit module of an intelligent electronic switch, a battery, a load, etc. provided in the fifth embodiment of the present application. Fig. 6A As shown, in this possible design, the current detection circuit 21 includes a mirror tube Q2 and a first sampling unit 211. The control end of the mirror tube Q2 is connected to the control end of the power switch Q1, the first end of the mirror tube Q2 is connected to the first end of the power switch Q1, the second end of the mirror tube Q2 is connected to one end of the first sampling unit 211 and the current processing circuit 22 respectively, and the other end of the first sampling unit 211 is connected to the second end of the power switch Q1.

[0159] In this embodiment, the output current of the mirror tube Q2 is mirrored to the output current of the power switch Q1 , and the first acquisition unit 211 outputs the output current of the power switch Q1 based on the acquired output current of the mirror tube Q2 .

[0160] Exemplarily, the first sampling unit 211 can be implemented by a resistor (with a known resistance value), and the output current of the mirror tube Q2 can be determined by the voltage division on the resistor, thereby reflecting the output current of the power switch Q1 and outputting the main current signal Ids. For example, when the main current signal Ids is characterized by voltage, the main current signal Ids can be equal to the voltage division voltage on the resistor, or can be less than the voltage division voltage on the resistor.

[0161] As another example, Figure 6B FIG. 1 is another circuit module schematic diagram of the intelligent electronic switch, battery, load, etc. provided in the fifth embodiment of the present application. Figure 6B As shown, in this possible design, the current detection circuit 21 includes a second sampling unit 212 .

[0162] The second sampling unit 212 is used to connect to both ends of the sampling resistor Rcs, the power switch Q1 is used to be connected in series with the sampling resistor Rcs, and the second sampling unit 212 is also connected to the current processing circuit 22. The second sampling unit 212 is used to collect the current on the sampling resistor Rcs to output the main current signal Ids.

[0163] In this embodiment, the second sampling unit 212 can collect the voltage across the sampling resistor Rcs (with a known resistance) and obtain a voltage difference, which can reflect the current on the sampling resistor Rcs. Since the sampling resistor Rcs is connected in series with the power switch Q1, the output current of the power switch Q1 is equal to the current on the sampling resistor Rcs. Therefore, the voltage representation value of the main current signal Ids output by the second sampling unit 212 is the voltage difference.

[0164] This embodiment does not limit the specific implementation form of the current detection circuit 21, which can be limited according to actual needs and will not be elaborated here.

[0165] It is understandable that other parts not detailed in the above embodiments can be found in the records of other embodiments of the present application and will not be described in detail here.

[0166] Optionally, based on the above embodiments, the embodiment of the present application further provides an integrated circuit chip, the integrated circuit chip includes the intelligent electronic switch 20 in the above embodiments, that is, the above intelligent electronic switch 20 can be made on the same semiconductor substrate. Among them, the power supply terminal VBAT is a power supply pin, the power ground terminal GND is a power ground pin, and the load output terminal OUT is a load output pin.

[0167] Optionally, other embodiments of the present application further provide a chip product, which may include the above-mentioned intelligent electronic switch 20, wherein the components of the intelligent electronic switch 20 other than the power switch Q1 and some components of the current detection circuit 21 (for example, the current processing circuit 22, the control circuit 23 and the drive regulation circuit 24) are located on a first integrated circuit chip, and the power switch Q1 and some components of the current detection circuit 21 are located on a second integrated circuit chip, that is, the first integrated circuit chip is made on one semiconductor substrate, and the second integrated circuit chip is made on another semiconductor substrate.

[0168] Among them, the power supply terminal VBAT is the power supply pin, the power ground terminal GND is the power ground pin, the load output terminal OUT is the load output pin, the power supply pin VBAT and the power ground pin GND are located on the first integrated circuit chip, and the load output pin is located on the second integrated circuit chip. In addition, the first integrated circuit chip also includes other pins, such as a first drive pin, and the second integrated circuit chip also includes other pins, such as a second drive pin, wherein the first drive pin is respectively connected to the drive circuit and the second drive pin, and the second drive pin is connected to the control end of the power switch Q1. It can be understood that the first integrated circuit chip and the second integrated circuit chip can also add other pins, omit related pins, or merge related pins as needed. Here, the first integrated circuit chip and the second integrated circuit chip are packaged into one product.

[0169] In addition, in other embodiments of the present application, a car is also provided. The car can be an electric car, such as an electric passenger car or an electric commercial vehicle, or a hybrid car or a fuel car. The car includes a battery 10, a load 30, a microprocessor (not shown) and an intelligent electronic switch 20.

[0170] The battery 10 is generally a storage battery, which provides voltages such as 12V, 24V, 48V, etc., and can also be other types of batteries. The load 30 includes at least one of a resistive load, an inductive load, and a capacitive load. The resistive load is, for example, a seat adjustment device, an auxiliary heating device, a window heating device, a light emitting diode (LED), a rear lighting, or other resistive loads. The inductive load is, for example, a pump, an actuator, a motor, an anti-lock braking system (ABS), an electronic braking system (EBS), a fan, or other systems including inductive loads for one or more wiper systems. The capacitive load is, for example, a lighting element, such as a xenon arc lamp.

[0171] The microcontroller is connected to the intelligent electronic switch for controlling the intelligent electronic switch. Meanwhile, the intelligent electronic switch feeds back its state and relevant parameter information, such as relevant parameter information of diagnosis, to the microprocessor for processing by the microprocessor.

[0172] It is understandable that the intelligent electronic switch and integrated circuit chip of this embodiment are not limited to use in automotive electronics, but can also be used in industrial automation, aerospace and other fields, which will not be elaborated here.

[0173] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0174] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. An intelligent electronic switch, characterized in that: It includes a power supply terminal, a power ground terminal, a load output terminal, a power switch, a current detection circuit, a current processing circuit, a control circuit and a drive regulation circuit; The power supply end and the power ground end are used to be connected to a battery, and the load output end is used to be connected to a load; the power switch is used to be connected in series with the load, with a first end connected to the power supply end or the power ground end, a second end connected to the load output end, and a control end connected to the drive regulation circuit, and the drive regulation circuit is used to control the power switch to be turned on or turned off; The current detection circuit is connected to the current processing circuit, the current processing circuit is also connected to the control circuit, the control circuit is also connected to the drive regulation circuit, and the current detection circuit is used to obtain the output current of the power switch and output the main current signal; The current processing circuit outputs a shutdown signal when it is determined that the main current signal meets a preset condition, and the control circuit outputs a cutoff control signal when receiving the shutdown signal, so that the drive regulation circuit controls the power switch to be turned off; The current processing circuit is further used to output a drive limit signal according to the main current signal before the power switch is turned off, and the control circuit receives the drive limit signal and limits the maximum output current of the power switch based on the drive limit signal when the power switch is turned on again; The control circuit includes a drive control subcircuit and a current limiting output subcircuit; The first input end of the drive control subcircuit is used to receive a drive control signal, the second input end of the drive control subcircuit and one end of the current limiting output subcircuit are both connected to the current processing circuit, and the output end of the drive control subcircuit and the other end of the current limiting output subcircuit are both connected to the drive regulation circuit; The drive control subcircuit shields the drive control signal and outputs a cutoff control signal when receiving the shutdown signal, so that the drive regulation circuit controls the power switch to be shut down. The current limiting output subcircuit is used to output the received drive limiting signal when receiving a trigger signal, and the trigger signal is used to indicate that the power switch has been completely shut down.

2. The intelligent electronic switch according to claim 1, characterized in that: The current processing circuit is further configured to generate a first coding signal. When the first coding signal satisfies a preset condition, the current processing circuit further generates the shutdown signal and synchronously determines the driving limit signal according to the first coding signal.

3. The intelligent electronic switch according to claim 2, characterized in that: The current processing circuit includes a threshold determination unit, an abnormality judgment unit and a current limiting unit; One end of the threshold determination unit is connected to the current detection circuit, and the other end is connected to the abnormality judgment unit, the abnormality judgment unit is also connected to the current limiting unit and the control circuit respectively, and the current limiting unit is also connected to the control circuit; The threshold determination unit is used to generate a second coding signal corresponding to the main current signal. The abnormality judgment unit generates a first coding signal based on the second coding signal, and outputs the first coding signal to the current limiting unit. When the first coding signal meets a preset condition, the abnormality judgment unit outputs a shutdown signal and the current limiting unit determines the drive limit signal according to the first coding signal.

4. The intelligent electronic switch according to claim 1, characterized in that: The current processing circuit is also used to obtain a second coding signal, which corresponds to the main current signal. When the main current signal meets a preset condition, the current processing circuit determines a target coding signal based on all the acquired second coding signals, and determines the drive limit signal based on the target coding signal, wherein the target coding signal is used to characterize the maximum current threshold reached before the power switch is turned off.

5. The intelligent electronic switch according to claim 4, characterized in that: The current processing circuit includes a threshold determination unit, an abnormality judgment unit and a current limiting unit; One end of the threshold determination unit is connected to the current detection circuit, and the other end is connected to the abnormality judgment unit and the current limiting unit, the abnormality judgment unit is also connected to the current limiting unit and the control circuit respectively, and the current limiting unit is also connected to the control circuit; The threshold determination unit is used to generate the second coding signal corresponding to the main current signal, the abnormality judgment unit generates a first coding signal based on the second coding signal, and when the first coding signal meets a preset condition, the abnormality judgment unit outputs a shutdown signal. The current limiting unit is also used to receive the second coding signal, and when the current limiting unit receives the shutdown signal, it determines a target coding signal based on all received second coding signals, and determines the drive limit signal based on the target coding signal.

6. The intelligent electronic switch according to claim 3 or 5, characterized in that: The threshold determination unit includes N current comparison units, the abnormality determination unit includes (N-1) timing units, (N-1) timing comparison units and an abnormality determination unit, where N is an integer greater than or equal to 2; The first input ends of the N current comparison units are connected to the current detection circuit, the second input ends of the N current comparison units are connected to the N current thresholds that increase in sequence, the output ends of the N current comparison units are connected to the input ends of the (N-1) timing units and the abnormality determination unit, the output ends of the (N-1) timing units are connected to the first input ends of the (N-1) timing comparison units, the second input ends of the (N-1) timing comparison units are connected to the (N-1) duration threshold information that decreases in sequence, and the output ends of the (N-1) timing comparison units are connected to the abnormality determination unit; N current comparison units compare the main current signal with N current thresholds correspondingly, output a first level signal when the main current signal is greater than or equal to the corresponding current threshold, and output a second level signal when the main current signal is less than the corresponding current threshold, and the N-bit level signals output by the N current comparison units form a second coded signal corresponding to the main current signal; The (N-1) timing units all start timing when receiving a first level signal, and continuously output timing information during the timing process or output timing information when receiving a second level signal. The (N-1) timing comparison units correspondingly compare the timing information of the (N-1) timing units with the (N-1) duration threshold information, and output a third level signal when the timing information is greater than or equal to the corresponding duration threshold information, and output a fourth level signal when the timing information is less than the corresponding duration threshold information. The level signal output by the Nth current comparison unit and the (N-1) level signal output by the (N-1) timing comparison unit form a first coded signal; wherein the preset condition is that the first level signal or the third level signal exists in the first coded signal.

7. The intelligent electronic switch according to any one of claims 1 to 5, characterized in that: The main current signal before the power switch is turned off is positively correlated with the maximum output current when the power switch is turned on again. The larger the main current signal before the power switch is turned off, the larger the maximum output current when the power switch is turned on again.

8. The intelligent electronic switch according to any one of claims 1 to 5, characterized in that: The intelligent electronic switch further includes a voltage detection circuit, and the control circuit further includes a voltage judgment subcircuit; the two ends of the voltage detection circuit are correspondingly connected to the control end of the power switch and the second end of the power switch, and the voltage detection circuit is used to detect the gate-source voltage of the power switch and output a gate-source voltage signal; the voltage judgment subcircuit, whose first input end is connected to the voltage detection circuit, whose second input end is used to access a preset voltage threshold, and whose output end is connected to the current limiting output subcircuit, and the voltage judgment subcircuit outputs the trigger signal when the gate-source voltage signal of the power switch is less than or equal to the preset voltage threshold; or, The control circuit further includes a current judgment subcircuit; the current judgment subcircuit has a first input terminal connected to the current detection circuit to access the main current signal, a second input terminal for accessing the first preset threshold, and an output terminal connected to the current limiting output subcircuit, and the current judgment subcircuit outputs the trigger signal when the current characterization value of the main current signal is less than or equal to the first preset threshold; or, The control circuit also includes a timing subcircuit, one end of which is connected to the drive control subcircuit, and the other end of which is connected to the current limiting output subcircuit. The timing subcircuit starts timing when receiving the cutoff control signal, and outputs the trigger signal when the timing information reaches the preset time information.

9. The intelligent electronic switch according to claim 1, characterized in that: The driving and regulating circuit comprises a charging unit, a charging switch, a discharging switch and a regulating unit; The charging unit and the charging switch are connected in series to form a charging branch, one end of the charging branch is connected to the first power supply end, the other end of the charging branch is connected to the control end of the power switch, the two ends of the discharge switch are connected to the control end and the second end of the power switch respectively, the two ends of the regulating unit are connected to the control end and the second end of the power switch respectively, the control end of the charging switch and the control end of the discharge switch are both connected to the drive control subcircuit, and the regulating end of the regulating unit is connected to the current limiting output subcircuit; When receiving the cut-off control signal, the driving regulation circuit controls the charging switch to be turned off and the discharging switch to be turned on, thereby causing the power switch to be turned off; When receiving the start-up control signal, the drive regulation circuit controls the charging switch to be turned on and the discharging switch to be turned off, and adjusts the current flowing through the regulation unit based on the received drive limit signal to adjust the voltage of the control end of the power switch, thereby limiting the maximum output current of the power switch.

10. The intelligent electronic switch according to claim 1, characterized in that: The driving and regulating circuit comprises a charging unit, a charging switch, a discharging switch and a regulating unit; The charging unit and the charging switch are connected in series to form a charging branch, one end of the charging branch is connected to the first power supply end, the other end of the charging branch is connected to the control end of the power switch, the two ends of the discharge switch are correspondingly connected to the control end and the second end of the power switch, the two ends of the regulating unit are correspondingly connected to the first power supply end and the second end of the power switch, the control end of the charging switch and the control end of the discharge switch are both connected to the drive control subcircuit, and the regulating end of the regulating unit is connected to the current limiting output subcircuit; When receiving the cut-off control signal, the driving regulation circuit controls the charging switch to be turned off and the discharging switch to be turned on, thereby causing the power switch to be turned off; When receiving the start control signal, the drive regulation circuit controls the charging switch to be turned on and the discharging switch to be turned off, and adjusts the voltage of the first power supply end through the regulation unit based on the received drive limit signal to adjust the voltage of the control end of the power switch, thereby limiting the maximum output current of the power switch.

11. The intelligent electronic switch according to claim 9 or 10, characterized in that: The adjustment unit includes any one of the following: A variable current source, a variable resistor, a switch tube, and a switch tube and a resistor connected in series.

12. An integrated circuit chip, characterized in that: The intelligent electronic switch comprises the intelligent electronic switch according to any one of claims 1 to 11, wherein the power supply end is a power supply pin, the power ground end is a power ground pin, and the load output end is a load output pin.

13. A chip product, characterized in that: The intelligent electronic switch according to any one of claims 1 to 11, wherein the components of the intelligent electronic switch except the power switch and some components of the current detection circuit are located on a first integrated circuit chip, and the power switch and some components of the current detection circuit are located on a second integrated circuit chip; Among them, the power supply end is a power supply pin, the power ground end is a power ground pin, and the load output end is a load output pin. The power supply pin and the power ground pin are located on a first integrated circuit chip, and the load output pin is located on a second integrated circuit chip.

14. A car, characterized in that: Comprising the intelligent electronic switch according to any one of claims 1 to 11, or the integrated circuit chip according to claim 12, or the chip product according to claim 13; It also includes a battery, a load and a microprocessor, wherein the positive electrode of the battery is connected to the power supply terminal, the negative electrode of the battery is connected to the power ground terminal, one end of the load is connected to the load output terminal, the other end of the load is connected to the power ground terminal or the power supply terminal, and the microprocessor is connected to the intelligent electronic switch.

15. The automobile according to claim 14, characterized in that The vehicle is an electric vehicle, a hybrid vehicle or a fuel vehicle, and the load includes at least one of a resistive load, an inductive load and a capacitive load.

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