Intelligent electronic switch, chip and device integrated with diode function

Abstract

The invention provides an intelligent electronic switch, a chip and a device integrated with a diode function, and the intelligent electronic switch is provided with a mode selection end, a substrate switching circuit and a control circuit. The substrate switching circuit comprises a first switch and a second switch, the first switch is connected between the drain end and the substrate end of the power switch, and the second switch is connected between the substrate end and the source end of the power switch. When the mode selection end receives a first signal, the first switch is controlled to be switched off, the second switch is controlled to be switched on, and the switching state of the power switch is controlled based on a switching control signal received by the input end, so that the function of a high-side switch is realized; and the switching state of the power switch is controlled according to the voltage of the power supply end and the voltage of the load output end, so that the function of the diode is realized. The intelligent electronic switch can realize high-side application and diode application at the same time, and the application range of the intelligent electronic switch is expanded.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to an intelligent electronic switch, chip and device with integrated diode function. Background Art

[0002] An intelligent electronic switch is usually used to couple a load with a battery. It is an electronic component that controls the on / off of a load circuit. It has multiple protection and diagnostic functions integrated inside, which improves the reliability of the intelligent electronic switch.

[0003] At present, in the application of high-side intelligent electronic switches, although the forward conduction impedance of the power switch is small, which can reduce the loss of the power switch, the power switch does not have the reverse current blocking capability, that is, it cannot block the current flowing in the reverse direction, resulting in that the existing intelligent electronic switch cannot be used as a diode, which limits the application scope of the intelligent electronic switch. Summary of the invention

[0004] The present application provides an intelligent electronic switch, a chip and a device with integrated diode function to solve the problem that the existing intelligent electronic switch cannot be used as a diode.

[0005] In a first aspect, the present application provides an intelligent electronic switch with an integrated diode function, including a power supply terminal, a power ground terminal, an input terminal, a load output terminal, a power switch, and a control circuit;

[0006] The power supply end and the power ground end are used to be connected to a battery, the power switch is used to be connected in series with a load, a first end of the power switch is connected to the power supply end, a second end of the power switch is connected to the load output end, and a control end of the power switch is connected to the control circuit, and the control circuit is used to control the power switch to be turned on or off;

[0007] It also includes a mode selection terminal and a substrate switching circuit, the substrate switching circuit includes a first switch and a second switch, the first switch is connected between the drain terminal and the substrate terminal of the power switch, the second switch is connected between the substrate terminal and the source terminal of the power switch, the control terminals of the first switch and the second switch are both connected to the control circuit, and the control circuit is also connected to the mode selection terminal and the input terminal;

[0008] When the mode selection end receives a first signal, the control circuit controls the first switch to be turned off and the second switch to be turned on, and controls the switching state of the power switch based on the switch control signal received at the input end; when the mode selection end receives a second signal, the control circuit controls the first switch to be turned on and the second switch to be turned off, and controls the switching state of the power switch according to the voltage of the power supply end and the voltage of the load output end.

[0009] Optionally, the control circuit includes a voltage judgment unit and a first control unit, the voltage judgment unit is respectively connected to the mode selection end, the power supply end, and the load output end, and the first control unit is also connected to the mode selection end and the control end of the power switch;

[0010] When the mode selection end receives the second signal, the voltage judgment unit starts working, and the voltage judgment unit is used to compare the voltage of the power supply end with the voltage of the load output end, and output a first level signal when the voltage of the power supply end is greater than the voltage of the load output end, so that the first control unit controls the power switch to turn on and conduct, and output a second level signal when the voltage of the power supply end is less than or equal to the voltage of the load output end, so that the first control unit controls the power switch to turn off and cut off.

[0011] Optionally, the intelligent electronic switch further includes a shutdown circuit, the shutdown circuit includes a third switch and a fourth switch, the third switch is connected between the drain terminal and the control terminal of the power switch, the fourth switch is connected between the control terminal and the source terminal of the power switch, and the control terminals of the third switch and the fourth switch are both connected to the first control unit;

[0012] The first control unit is used for controlling the third switch to be turned on and the fourth switch to be turned off when receiving the second level signal, so as to turn off the power switch.

[0013] Optionally, when the mode selection end receives a first signal and the input end receives a shutdown control signal, the first control unit is further used to control the third switch to be turned off and the fourth switch to be turned on, so that the power switch is turned off.

[0014] Optionally, the intelligent electronic switch further includes a voltage clamping circuit, wherein the voltage clamping circuit is respectively connected to a source terminal and a drain terminal of the power switch, and the voltage clamping circuit is also connected to the control circuit;

[0015] When the mode selection end receives the second signal and the power switch is turned on, the voltage clamping circuit is used to obtain the drain-source voltage value of the power switch and output an adjustment signal according to the drain-source voltage value and the connected reference voltage value, so that the control circuit adjusts the gate control signal output to the power switch to clamp the drain-source voltage value to the reference voltage value; wherein, when the drain-source voltage value is clamped to the reference voltage value, the smaller the gate control signal is, the shorter the time required for the power switch to be turned off.

[0016] As an example, the voltage clamping circuit includes a drain-source voltage detection unit and an operational amplifier unit;

[0017] The input end of the drain-source voltage detection unit is respectively connected to the drain end and the source end of the power switch, and the output end is connected to the operational amplifier unit. The operational amplifier unit is also used to access the reference voltage value. The operational amplifier unit is also connected to the control circuit.

[0018] The drain-source voltage detection unit is used to obtain the drain voltage value and the source voltage value of the power switch and output the drain-source voltage value. The operational amplifier unit outputs an adjustment signal when the drain-source voltage value is inconsistent with the reference voltage value. The adjustment signal is used to instruct the control circuit to adjust the output gate control signal to clamp the drain-source voltage value to the reference voltage value.

[0019] Optionally, the intelligent electronic switch also includes a reference voltage setting pin and a reference voltage setting circuit, the reference voltage setting circuit is connected to the voltage clamping circuit and the reference voltage setting pin, the reference voltage setting pin is also used to connect to a first resistor, the first resistor is used to set the reference voltage value based on the reference voltage setting circuit, the larger the resistance of the first resistor, the larger the reference voltage value.

[0020] In a second aspect, an embodiment of the present application provides an integrated circuit chip, comprising an intelligent electronic switch with integrated diode function as described in the first aspect, wherein the power supply end is a power supply pin, the power ground end is a power ground pin, the input end is an input pin, the load output end is a load output pin, and the mode selection end is the mode selection pin.

[0021] In a third aspect, an embodiment of the present application provides a chip product, including the intelligent electronic switch with integrated diode function as described in the first aspect, wherein the components of the intelligent electronic switch except the power switch are located on a first integrated circuit chip, and the power switch is located on a second integrated circuit chip;

[0022] Among them, the power supply end is a power supply pin, the power ground end is a power ground pin, the input end is an input pin, the load output end is a load output pin, the mode selection end is the mode selection pin, the power supply pin, the power ground pin, the input pin, and the mode selection pin are located on a first integrated circuit chip, and the load output pin is located on a second integrated circuit chip.

[0023] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising the intelligent electronic switch with integrated diode function as described in the first aspect, or the integrated circuit chip as described in the second aspect, or the chip product as described in the third aspect;

[0024] It also includes a battery, a load, and a microcontroller, wherein the positive electrode of the battery is connected to the power supply end, the negative electrode of the battery is connected to the power ground end, one end of the load is connected to the load output end, the other end of the load is connected to the power ground end, the intelligent electronic switch is connected to the microcontroller, and the microcontroller is used to control the intelligent electronic switch.

[0025] The embodiment of the present application provides an intelligent electronic switch, chip and device with integrated diode function, wherein the intelligent electronic switch has a mode selection end, a substrate switching circuit and a control circuit, the control circuit can receive a mode selection indication through the mode selection end, and then control the intelligent electronic switch to be used as a diode or a high-side switch through the substrate switching circuit. Specifically, the substrate switching circuit includes a first switch and a second switch, the first switch is connected between the drain end and the substrate end of the power switch, and the second switch is connected between the substrate end and the source end of the power switch, so that when the mode selection end receives a first signal, the control circuit controls the first switch to be turned off and the second switch to be turned on, and controls the switch state of the power switch based on the switch control signal received at the input end, thereby realizing the function of the high-side switch; when the mode selection end receives a second signal, the control circuit controls the first switch to be turned on and the second switch to be turned off, and controls the switch state of the power switch according to the voltage of the power supply end and the voltage of the load output end, thereby realizing the function of the diode. In this scheme, the intelligent electronic switch realizes the diode application on the basis of realizing the high-side application, which not only expands the application range of the intelligent electronic switch, but also reduces its power consumption during use as a diode. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 and Figure 2 It is a circuit module schematic diagram of the intelligent electronic switch and its peripheral components provided in the first embodiment of the present application;

[0028] Figure 3 It is a circuit module schematic diagram of an intelligent electronic switch and its peripheral components provided in the second embodiment of the present application;

[0029] Figure 4 and Figure 5It is a circuit module schematic diagram of an intelligent electronic switch and its peripheral components provided in the third embodiment of the present application;

[0030] Figure 6 is a circuit module schematic diagram of an intelligent electronic switch and its peripheral components provided in the fourth embodiment of the present application;

[0031] Figure 7 Yes Figure 6 A schematic diagram of a circuit module after the voltage clamping circuit in FIG. 1 is modularized;

[0032] Figure 8 It is a circuit module schematic diagram of an intelligent electronic switch and its peripheral components provided in the fifth embodiment of the present application.

[0033] 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

[0034] 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.

[0035] 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.

[0036] 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.

[0037] With the acceleration of the transformation of the automotive intelligent industry, more and more electronic switches are installed in cars. In practical applications, intelligent electronic switches are used to drive and switch the loads in the car, and protect and diagnose the loads because of their high reliability, flexibility, low power consumption, small size and light weight. They are widely used in automotive electronics, industrial automation, medical equipment and other fields. Therefore, intelligent electronic switches have gradually become the trend of switch development.

[0038] An intelligent electronic switch usually couples the load to the battery through a power switch. It is an electronic component that controls the on and off of the load circuit. It has one or more diagnostic capabilities and protection features, which improves the reliability of the intelligent electronic switch during use. In addition, since the forward conduction impedance of the power switch is small, after it is fully turned on, the voltage drop across its two ends is almost zero, which greatly reduces the loss of the power switch during application. However, the power switch itself does not have the reverse current blocking capability, that is, it cannot block the current flowing through the power switch in the reverse direction, so that the existing intelligent electronic switch cannot take into account the forward conduction and reverse cutoff performance of the diode, which makes the existing intelligent electronic switch unable to be used as a diode, limiting the application scope of the intelligent electronic switch.

[0039] In view of the above technical problems, an embodiment of the present application provides an intelligent electronic switch with integrated diode function, which has a mode selection end, a substrate switching circuit and a control circuit. The control circuit can receive a mode selection indication through the mode selection end, and then control the intelligent electronic switch to be used as a diode or a high-side switch through the substrate switching circuit. In the intelligent electronic switch with integrated diode function provided by the solution, the power switch can be used as a high-side switch or a diode, which not only expands the application range of the intelligent electronic switch, but also reduces its power consumption when used as a diode.

[0040] 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.

[0041] Figure 1 and Figure 2 1 is a schematic diagram of a circuit module of an intelligent electronic switch and its peripheral components provided in the first embodiment of the present application. The intelligent electronic switch integrates a diode function. Figure 1 and Figure 2 As shown, the intelligent electronic switch 20 includes a power supply terminal VBAT, a power ground terminal GND, an input terminal INPUT, a load output terminal OUT, a power switch Q and a control circuit 21.

[0042] The power supply terminal VBAT and the power ground terminal GND are used to connect to the battery 10. Specifically, the power supply terminal VBAT is connected to the positive electrode of the battery 10, and the power ground terminal GND is connected to the negative electrode of the battery 10. The power switch Q is used to be connected in series with the load 30, with its first end connected to the power supply terminal VBAT, its second end connected to the load output terminal OUT, and its control end connected to the control circuit 21. The control circuit 21 is used to control the power switch Q to turn on or off. It can be understood that Figure 1 and Figure 2 In the illustrated embodiment, a first terminal of the power switch Q is connected to the positive electrode of the battery 10 . At this time, the power switch Q is connected as a high-side switch (high-side switch), which is a switch connected between the positive electrode of the battery 10 and the load 30 .

[0043] In the embodiment of the present application, the power switch Q may be an N-type metal-oxide-semiconductor field-effect transistor (NMOS FET, referred to as NMOS tube), a PMOS tube, a junction field effect transistor (JFET) or an insulated gate bipolar transistor (IGBT), etc. In other embodiments of the present application, the power switch Q 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. The embodiment of the present application does not limit the form of the power switch Q.

[0044] As an example, in Figure 1 In the following, the power switch Q is described as an NMOS tube. Figure 1 As shown, when the power switch Q is an NMOS tube, its first end is the drain terminal d, and the second end is the source terminal s. At this time, the drain terminal d of the NMOS tube is connected to the power supply terminal VBAT, and its drain terminal d and the substrate terminal SUB have a body diode D1, and its substrate terminal SUB and the source terminal s have a body diode D2. The anode of the body diode D1 and the anode of the body diode D2 are both connected to the substrate terminal SUB, and the cathode of the body diode D1 is connected to the drain terminal d, and the cathode of the body diode D2 is connected to the source terminal s.

[0045] As another example, in Figure 2 The power switch Q is a PMOS tube. Figure 2As shown, when the power switch Q is a PMOS tube, its first end is the source terminal s, and the second end is the drain terminal d. At this time, the source terminal s of the PMOS tube is connected to the power supply terminal VBAT, and its source terminal s and the substrate terminal SUB have a body diode D4, and its substrate terminal SUB and the drain terminal d have a body diode D3, and the cathode of the body diode D3 and the cathode of the body diode D4 are both connected to the substrate terminal SUB, and the anode of the body diode D3 is connected to the drain terminal d, and the anode of the body diode D4 is connected to the source terminal s.

[0046] In the embodiment of the present application, in order to control the power switch Q to realize different functions, the intelligent electronic switch needs to receive a mode selection signal to connect the power switch Q to be used as a high-side switch or as a diode. At this time, it is necessary to configure the connection relationship between the substrate terminal SUB and the drain terminal d and the source terminal s, so that when the power switch Q is connected to the high-side switch, the source terminal s is connected to the substrate terminal SUB, that is, the body diode connected between the substrate terminal SUB and the source terminal s is short-circuited, and the body diode connected between the substrate terminal SUB and the drain terminal d is retained. In this way, between the power supply terminal VBAT and the load output terminal OUT When a forward voltage is applied, the body diode connected between the substrate terminal SUB and the drain terminal d can prevent current from flowing; similarly, when the power switch Q is connected as a diode, the drain terminal d needs to be connected to the substrate terminal SUB, that is, the body diode connected between the substrate terminal SUB and the drain terminal d is short-circuited, while retaining the body diode connected between the substrate terminal SUB and the source terminal s. In this way, when a forward voltage is applied between the power supply terminal VBAT and the load output terminal OUT, the body diode connected between the substrate terminal SUB and the source terminal s can allow current to flow, thereby making the power switch Q have the forward conduction characteristic of a diode.

[0047] In this embodiment, in order to control the intelligent electronic switch 20 to realize different functions and configure the connection state between the substrate terminal SUB and the source terminal s and the drain terminal d, the intelligent electronic switch 20 provided in the embodiment of the present application also needs to determine the target working mode, and configure the connection relationship between the substrate terminal SUB and the drain terminal d and the source terminal s according to the target working mode.

[0048] Continue to refer to Figure 1 and Figure 2As shown, the intelligent electronic switch 20 also includes a mode selection terminal EN and a substrate switching circuit 22, and the substrate switching circuit 22 includes a first switch K1 and a second switch K2. The first switch K1 is connected between the drain terminal d and the substrate terminal SUB of the power switch Q, and the second switch K2 is connected between the substrate terminal SUB and the source terminal s of the power switch Q. The control terminals of the first switch K1 and the second switch K2 are both connected to the control circuit 21, and the control circuit 21 is also connected to the mode selection terminal EN and the input terminal INPUT. In this embodiment, the control circuit 21 can selectively turn on one of the first switch K1 and the second switch K2 according to the signal received by the mode selection terminal EN, and correspondingly turn off the other of the two, thereby selectively controlling the connection relationship between the substrate terminal SUB of the power switch Q and the source terminal s and the drain terminal d.

[0049] In practical applications, as an example, when the mode selection terminal EN receives the first signal, the control circuit 21 controls the first switch K1 to be turned off and the second switch K2 to be turned on. At this time, the substrate terminal SUB of the power switch Q is connected to the source terminal s, and the power switch Q has a body diode connected between the drain terminal d and the substrate terminal SUB, and the conduction direction of the body diode is opposite to the current direction provided by the battery 10. The power switch Q is connected as a high-side switch. Therefore, the control circuit 21 can detect the signal received by the input terminal INPUT, and control the switching state of the power switch Q based on the switch control signal (ON signal or OFF signal) received by the input terminal INPUT. For example, when the input terminal INPUT receives the start control signal (ON signal), the power switch Q is controlled to be turned on, and when the input terminal INPUT receives the shutdown control signal (OFF signal), the power switch Q is controlled to be turned off.

[0050] As another example, when the mode selection terminal EN receives the second signal, the control circuit 21 controls the first switch K1 to be turned on and the second switch K2 to be turned off. At this time, the power switch Q has a body diode connected between the source terminal s and the substrate terminal SUB, and the conduction direction of the body diode is consistent with the current direction provided by the battery 10. When a voltage is applied between the power supply terminal VBAT and the load output terminal OUT, the body diode of the power switch Q allows current to flow, so the power switch Q can be connected as a diode. Therefore, in this example, the control circuit 21 controls the switching state of the power switch Q based on the voltage of the power supply terminal VBAT and the voltage of the load output terminal OUT.

[0051] Optionally, in this embodiment, in order to achieve opposite control on the states of the first switch K1 and the second switch K2, Figure 1 and Figure 2In the embodiment, when the control circuit 21 outputs a control signal Con1 to jointly control the switch states of the first switch K1 and the second switch K2, an inverter 220 is connected between the control circuit 21 and the control end of the second switch K2, and the control circuit 21 is directly connected to the control end of the first switch K1. It is understood that in other embodiments, an inverter may be connected between the control circuit 21 and the control end of the first switch K1, and the control circuit 21 is directly connected to the control end of the second switch K2, so that the control circuit 21 controls the switch states of the first switch K1 and the second switch K2 through one signal. In other embodiments, the control circuit 21 may also output two different control signals to realize the switch state control of the first switch K1 and the second switch K2, which will not be elaborated in this application.

[0052] Optionally, in view of the fact that the forward voltage drop of the diode is about 0.7V, the power consumption on the body diode is relatively large when it is forward-conducted. Therefore, when the voltage of the power supply terminal VBAT is greater than the voltage of the load output terminal OUT, the current flows forward at this time, and the power switch Q can be controlled to turn on and conduct, so that the forward current flows to the load output terminal OUT through the channel of the power switch Q. At this time, the voltage drop of the power switch Q is about 0.1V. Therefore, when the magnitude of the current flowing in the forward direction is the same, the power consumption on the power switch Q is much less than the power consumption on the body diode. However, since the channel of the power switch Q does not have the ability to reverse cutoff, when the control circuit 21 detects that the voltage of the power supply terminal VBAT is less than the voltage of the load output terminal OUT, that is, the current flows in the reverse direction, the power switch Q needs to be turned off at this time to block the reverse current path, so that the power switch Q can achieve the function of forward conduction and reverse cutoff.

[0053] Optional, see Figure 1 and Figure 2 As shown, in an embodiment of the present application, the intelligent electronic switch 20 can also be externally connected to the microcontroller 40, for example, the input terminal INPUT and the mode selection terminal EN are both connected to the microcontroller 40, so that in one possible design, the microcontroller 40 can output a first signal to the mode selection terminal EN so that the control circuit 21 connects the power switch Q as a high-side switch, and outputs a switch control signal to the input terminal INPUT to control the switching state of the power switch Q; in another possible design, the microcontroller 40 can output a second signal to the mode selection terminal EN so that the control circuit 21 connects the power switch Q as a diode, and at this time, the control circuit 21 can shield or ignore the signal received by the input terminal INPUT.

[0054] Optionally, in practical applications, a fuse 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 current limiting resistor may be provided to improve the stability of the intelligent electronic switch 20.

[0055] Optional, in Figure 1 and Figure 2 In the schematic diagram shown, the connection relationship between the control circuit 21 and the substrate switching circuit 22 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 or step up the voltage of the power supply terminal VBAT, so that the processed voltage can meet the power supply requirements of each internal circuit, and then provide it to the corresponding circuit to make it work normally. In other embodiments, the power supply unit may not be set inside the intelligent electronic switch 20. In this case, a step-up or step-down unit may be set between the power supply terminal VBAT and the positive electrode of the battery 10 to increase or decrease the voltage input to the power supply terminal VBAT to the rated working voltage of the intelligent electronic switch 20, so that the voltage at the power supply terminal VBAT can directly power certain circuits inside the intelligent electronic switch 20, thereby ensuring that the intelligent electronic switch 20 can work normally.

[0056] The intelligent electronic switch with integrated diode function provided by the embodiment of the present application has a mode selection end, a substrate switching circuit and a control circuit, wherein the substrate switching circuit includes a first switch and a second switch, wherein the first switch is connected between the drain end and the substrate end of the power switch, and the second switch is connected between the substrate end and the source end of the power switch, so that when the mode selection end receives the first signal, the control circuit controls the first switch to be turned off, the second switch to be turned on, and controls the switch state of the power switch based on the switch control signal received at the input end, thereby realizing the function of the high-side switch; when the mode selection end receives the second signal, the control circuit controls the first switch to be turned on, the second switch to be turned off, and controls the switch state of the power switch according to the voltage at the power supply end and the voltage at the load output end, thereby realizing the function of the diode. In this solution, the intelligent electronic switch realizes the diode application on the basis of realizing the high-side application, thereby expanding the application range of the intelligent electronic switch and reducing the power consumption during its use as a diode.

[0057] In order to make the intelligent electronic switch 20 have the functions of forward conduction and reverse cutoff, the following Figure 1 Based on the structural diagram shown in Figure 3 The circuit module schematic diagram shown in FIG. 1 illustrates the implementation principle of the control circuit 21. Figure 2The implementation scheme for explaining the implementation principle of the control circuit 21 based on the structural schematic diagram is similar and will not be described in detail in this embodiment.

[0058] Figure 3 Schematic diagram of the circuit module of the intelligent electronic switch and its peripheral components provided in the second embodiment of the present application. Figure 3 As shown, in this embodiment, the control circuit 21 includes a voltage judgment unit 211 and a first control unit 212. The voltage judgment unit 211 is connected to the mode selection terminal EN, the power supply terminal VBAT, and the load output terminal OUT respectively, and the first control unit 212 is also connected to the mode selection terminal EN and the control terminal of the power switch Q.

[0059] In this embodiment, when the mode selection terminal EN receives the second signal, the voltage judgment unit 211 starts to work. The voltage judgment unit 211 is used to compare the voltage of the power supply terminal VBAT with the voltage of the load output terminal OUT. When the voltage of the power supply terminal VBAT is greater than the voltage of the load output terminal OUT, the first level signal is output so that the first control unit 212 controls the power switch Q to turn on and conduct. When the voltage of the power supply terminal VBAT is less than or equal to the voltage of the load output terminal OUT, the second level signal is output so that the first control unit 212 controls the power switch Q to turn off and cut off.

[0060] Optional, see Figure 3 As shown, the voltage judgment unit 211 can be implemented by a comparator CP, whose first input terminal is connected to the power supply terminal VBAT, whose second input terminal is connected to the load output terminal OUT, and whose enable terminal is connected to the mode selection terminal EN. In this embodiment, when the mode selection terminal EN receives the second signal, the power switch Q will be connected as a diode application, and the comparator CP is enabled at this time, which can turn on the power switch Q in time when the voltage of the power supply terminal VBAT is greater than the voltage of the load output terminal OUT, that is, there is a forward voltage at both ends of the power switch Q, so as to reduce the power consumption on the body diode of the power switch Q, and can also turn off the power switch Q in time when the voltage of the power supply terminal VBAT is less than the voltage of the load output terminal OUT, that is, there is a reverse voltage at both ends of the power switch Q, so as to achieve the reverse cutoff function.

[0061] Specifically, the comparator CP starts working when the enable terminal receives the second signal, obtains the voltage of the power supply terminal VBAT and the voltage of the load output terminal OUT through the two input terminals, and compares the magnitudes of the two. Assume that the first input terminal of the comparator CP is the positive phase terminal (+), and the second input terminal is the negative phase terminal (-). Therefore, as an example, when the voltage of the power supply terminal VBAT is greater than the voltage of the load output terminal OUT, the positive phase terminal voltage of the comparator CP is greater than the negative phase terminal voltage, and the comparator CP outputs a high level signal. At this time, the first control unit 212 controls the power switch Q to turn on. As another example, when the voltage of the power supply terminal VBAT is less than the voltage of the load output terminal OUT, the positive phase terminal voltage of the comparator CP is less than the negative phase terminal voltage, and the comparator CP outputs a low level signal. At this time, the first control unit 212 controls the power switch Q to turn on.

[0062] It can be understood that in this embodiment, the first level signal is a high level signal, and the second level signal is a low level signal. In other embodiments, when the first input terminal of the comparator CP is the inverting terminal (-) and the second input terminal is the non-inverting terminal (+), the first level signal is a low level signal, and the second level signal is a high level signal. Therefore, the embodiment of the present application does not limit the specific expression form of the first level signal and the second level signal, which is determined according to actual conditions.

[0063] In an embodiment of the present application, the control circuit judges the voltage at the power supply end and the voltage at the load output end through a voltage judgment unit, so that the first control unit controls the switching state of the power switch according to the comparison result of the voltage judgment unit, that is, when the voltage at the power supply end is greater than the voltage at the load output end, the power switch is controlled to turn on, and when the voltage at the power supply end is less than the voltage at the load output end, the power switch is controlled to turn off, so that when the power switch is connected as a diode, it fully complies with the forward conduction and reverse cutoff characteristics of the diode, and reduces the power consumption of the power switch when it is used as a diode.

[0064] It can be understood that in the embodiment of the present application, no matter whether the power switch Q is connected as a high-side switch or as a diode, after the first control unit 212 controls it to turn on, it is also necessary to turn it off in time when the shutdown condition is met. For example, when the power switch Q is connected as a high-side switch, the current flows from the power supply terminal VBAT to the load output terminal OUT. When the input terminal INPUT receives a shutdown control signal, the power switch Q needs to be turned off; and when the power switch Q is connected as a diode, when its current is reversed, that is, when the current flows from the load output terminal OUT to the power supply terminal VBAT, the power switch Q needs to be turned off immediately. It can be seen that when the power switch Q is connected as a high-side switch and a diode, the shutdown directions of the two are different. In response to this problem, the intelligent electronic switch 20 provided in the third embodiment of the present application also includes a shutdown circuit to meet different shutdown requirements of different applications.

[0065] For example, Figure 4 and Figure 5 It is a circuit module schematic diagram of an intelligent electronic switch and its peripheral components provided in the third embodiment of the present application. Figure 4 Yes Figure 3 An expanded schematic diagram of the circuit module schematic shown, Figure 5 Yes Figure 2 The schematic diagram of the circuit module shown in FIG. Figure 1 , Figure 3 and Figure 4 The power switch Q is explained as an NMOS tube. Figure 2 and Figure 5 The power switch Q is explained as a PMOS tube. It can be understood that Figure 5 The control circuit 21 in the embodiment may also include a voltage determination unit 211 and a first control unit 212. The specific implementation of the control circuit 21 may refer to Figure 3 The specific implementation of the control circuit 21 in the illustrated embodiment is similar in principle to that of the two, and will not be described in detail in this embodiment.

[0066] Continue to refer to Figure 4 and Figure 5 As shown, the intelligent electronic switch further includes a shut-off circuit 23, and the shut-off circuit 23 includes a third switch K3 and a fourth switch K4. The third switch K3 is connected between the drain terminal d and the control terminal of the power switch Q, and the fourth switch K4 is connected between the control terminal and the source terminal s of the power switch Q. The control terminals of the third switch K3 and the fourth switch K4 are both connected to the first control unit 212.

[0067] In this embodiment, the first control unit 212 is used to control the third switch K3 to be turned on and the fourth switch K4 to be turned off when receiving the second level signal, so that the power switch Q is turned off.

[0068] Optionally, in this embodiment, when the power switch Q is connected as a diode, if the current flowing through the power switch Q is reversed, that is, the voltage at the load output terminal OUT is greater than the voltage at the power supply terminal VBAT, the power switch Q needs to be turned off in time to meet the reverse cutoff characteristics of the diode. Specifically, the first control unit 212 can control the third switch K3 to be turned on and the fourth switch K4 to be turned off when receiving a second level signal indicating that the voltage at the load output terminal OUT is greater than the voltage at the power supply terminal VBAT, so as to control the power switch Q to be turned off.

[0069] As an example, see Figure 4 As shown, when the power switch Q is an NMOS tube and is connected as a diode, in order to turn off the NMOS tube, the third switch K3 can be controlled to be turned on and the fourth switch K4 can be turned off to discharge the control terminal voltage of the power switch Q, thereby turning off the NMOS tube.

[0070] As another example, refer to Figure 5 As shown, when the power switch Q is a PMOS tube and is connected as a diode, in order to turn off the PMOS tube, the third switch K3 can be controlled to be turned on and the fourth switch K4 can be turned off to increase the control terminal voltage of the power switch Q, thereby controlling the PMOS tube to be turned off.

[0071] It can be understood that when the power switch Q is connected as a diode application (the mode selection terminal EN receives the second signal), when the control circuit 21 determines that the voltage of the power supply terminal VBAT is greater than the voltage of the load output terminal OUT, it can control the third switch K3 to be turned off and the fourth switch K4 to be turned on, so as to control the power switch Q to be turned on.

[0072] In this embodiment, by adding a shutdown circuit 23 to the intelligent electronic switch, and connecting the third switch K3 between the drain terminal d and the control terminal of the power switch Q, and connecting the fourth switch K4 between the control terminal and the source terminal s of the power switch Q, the first control unit 212 can selectively control the states of the third switch K3 and the fourth switch K4 according to the judgment result of the voltage judgment unit 211, so as to shut down the power switch Q in time when it is necessary to shut down the power switch Q.

[0073] For further information, please refer to Figure 4 and Figure 5 In an embodiment of the present application, when the mode selection terminal EN receives the first signal and the input terminal INPUT receives the shutdown control signal, the first control unit 212 is also used to control the third switch K3 to be turned off and the fourth switch K4 to be turned on, so as to control the power switch Q to be turned off.

[0074] Optionally, in this embodiment, when the power switch Q is connected as a high-side switch application (ie, the mode selection terminal EN receives a first signal), if the input terminal INPUT receives a shutdown control signal, the power switch Q needs to be controlled to be shut down.

[0075] As an example, see Figure 4 As shown, when the power switch Q is an NMOS tube and is connected as a high-side switch application, in order to turn off the NMOS tube, the third switch K3 can be turned off and the fourth switch K4 can be turned on to discharge the control terminal voltage of the power switch Q, thereby turning off the NMOS tube. As another example, refer to Figure 5 As shown, when the power switch Q is a PMOS tube and is connected as a high-side switch application, in order to turn off the PMOS tube, the third switch K3 can be controlled to be turned off and the fourth switch K4 can be turned on to increase the control terminal voltage Vg of the power switch Q, thereby controlling the PMOS tube to be turned off.

[0076] It is understandable that when the power switch Q is connected as a high-side switch, if the input terminal INPUT receives an on control signal, the control circuit 21 can control the third switch K3 to be on and the fourth switch K4 to be off, so as to control the power switch Q to be on.

[0077] Optionally, in this embodiment, the states of the third switch K3 and the fourth switch K4 may be controlled in a manner similar to that of the first switch K1 and the second switch K2. Figure 4 and Figure 5 In the embodiment, when the first control unit 212 outputs a control signal Con2 to jointly control the switch states of the third switch K3 and the fourth switch K4, an inverter 230 is connected between the first control unit 212 and the control end of the fourth switch K4, and the first control unit 212 is directly connected to the control end of the third switch K3. It is understood that in other embodiments, an inverter may be connected between the first control unit 212 and the control end of the third switch K3, and the first control unit 212 is directly connected to the control end of the fourth switch K4, so that the first control unit 212 controls the switch states of the third switch K3 and the fourth switch K4 through one signal. In other embodiments, the first control unit 212 may also output two different control signals to realize the switch state control of the third switch K3 and the fourth switch K4, which will not be elaborated in this application.

[0078] From the above analysis, it can be seen that by setting a shutdown circuit, that is, connecting the third switch between the substrate end and the drain end of the power switch, and connecting the fourth switch between the substrate end and the source end, the states of the third switch and the fourth switch can be controlled according to the application of the power switch, so that their on and off states are both controlled, thereby improving the reliability of the intelligent electronic switch during application.

[0079] Optionally, when the power switch Q is connected as a diode, in order to make it closer to the diode characteristics, that is, to block the reverse current, the present application also provides a fourth embodiment, which reduces the turn-off cut-off time of the power switch Q by clamping the drain-source voltage value Vds of the power switch Q.

[0080] For example, Figure 6 Schematic diagram of the circuit module of the intelligent electronic switch and its peripheral components provided in the fourth embodiment of the present application. Figure 6 As shown, in this embodiment, the intelligent electronic switch 20 further includes a voltage clamping circuit 24 , which is respectively connected to the source terminal s and the drain terminal d of the power switch Q, and is also connected to the control circuit 21 .

[0081] When the mode selection terminal EN receives the second signal and the power switch Q is turned on, the voltage clamping circuit 24 is used to obtain the drain-source voltage value Vds of the power switch Q and output the adjustment signal Vadj according to the drain-source voltage value Vds and the connected reference voltage value Vref, so that the control circuit 21 adjusts the gate control signal Vg output to the power switch Q to clamp the drain-source voltage value Vds to the reference voltage value Vref; wherein, when the drain-source voltage value Vds is clamped to the reference voltage value Vref, the smaller the gate control signal Vg is, the shorter the time required for the power switch Q to be turned off.

[0082] Optionally, in the present embodiment, after the control circuit 21 connects the power switch Q as a diode based on the received second signal and controls the power switch Q to turn on and conduct, the power switch Q can also be controlled to operate in a saturation region (i.e., a constant current region), so that the voltage clamping circuit 24, under the action of the reference voltage value Vref, can be connected with the control circuit 21 and the power switch Q to form a negative feedback loop; the voltage clamping circuit 24 can compare the drain-source voltage value Vds with the reference voltage value Vref and generate an adjustment signal Vadj according to the difference between the two, so that the control circuit 21 adjusts the gate control signal Vg output to the power switch Q to control the on-resistance of the power switch Q, and then on the basis of clamping the drain-source voltage value Vds of the power switch Q to the reference voltage value Vref, the gate control signal Vg output to the power switch Q is controlled.

[0083] In an embodiment of the present application, after the negative feedback loop is stabilized, as an example, if the load current Ids flowing through the power switch Q decreases, at this time, the voltage clamping circuit 24 will detect that the drain-source voltage value Vds is less than the reference voltage value Vref. According to the working characteristics of the power switch Q in the saturation region, the voltage clamping circuit 24 outputs the adjustment signal Vadj to make the control circuit 21 reduce the gate control signal Vg output to the power switch Q, so that the internal resistance value Ron of the power switch Q can be increased to prevent the drain-source voltage value Vds of the power switch Q from decreasing. The one decreases and the one increases, so that the product of the internal resistance value Ron of the power switch Q and the load current Ids flowing through the power switch Q always follows the reference voltage value Vref, so as to achieve the purpose of clamping the drain-source voltage value Vds of the power switch Q to the reference voltage value Vref. As another example, if the load current Ids flowing through the power switch Q increases, at this time, the voltage clamping circuit 24 will detect that the drain-source voltage value Vds is greater than the reference voltage value Vref. The voltage clamping circuit 24 outputs the adjustment signal Vadj to enable the control circuit 21 to increase the gate control signal Vg output to the power switch Q, so that the internal resistance value Ron of the power switch Q can be reduced to prevent the drain-source voltage value Vds of the power switch Q from increasing. The increase and decrease can make the product of the internal resistance value Ron of the power switch Q and the load current Ids flowing through the power switch Q always follow the reference voltage value Vref, thereby achieving the purpose of clamping the drain-source voltage value Vds of the power switch Q to the reference voltage value Vref.

[0084] In this embodiment, the gate control signal Vg output by the control circuit 21 to the control end of the power switch Q is positively correlated with the load current Ids flowing through the power switch Q, that is, when the load current Ids becomes smaller, the internal resistance value Ron of the power switch Q can be increased by reducing the gate control signal Vg, and the drain-source voltage value Vds of the power switch Q can also be clamped to the reference voltage value Vref.

[0085] It can be understood that in the present embodiment, when the control circuit 21 detects that the current flowing through the power switch Q is reversed, the current flowing through the power switch Q is relatively small, and accordingly, the gate control signal Vg output by the control circuit 21 to the power switch Q is relatively small. At this time, the time required to control the power switch Q to be turned off is relatively short, thereby making the power switch Q connected as a diode more in line with the reverse cutoff characteristics of the diode.

[0086] Optionally, in an embodiment of the present application, in order to clamp the drain-source voltage value Vds to the reference voltage value Vref, the following Figure 7 The circuit module schematic shown is explained. Figure 7 Yes Figure 6 Schematic diagram of the circuit module after the voltage clamp circuit in FIG. Figure 7In the schematic diagram shown, the voltage clamping circuit 24 includes a drain-source voltage detection unit 241 and an operational amplifier unit 242 .

[0087] Reference Figure 7 As shown, the input end of the drain-source voltage detection unit 241 is respectively connected to the drain terminal d and the source terminal s of the power switch Q, and its output end is connected to the operational amplifier unit 242. The operational amplifier unit 242 is also used to access the reference voltage value Vref. The operational amplifier unit 242 is also connected to the control circuit 21.

[0088] In this embodiment, the drain-source voltage detection unit 241 is used to obtain the drain voltage value Vd and the source voltage value Vs of the power switch Q and output the drain-source voltage value Vds. The operational amplifier unit 242 outputs an adjustment signal Vadj when the drain-source voltage value Vds is inconsistent with the reference voltage value Vref. The adjustment signal Vadj is used to instruct the control circuit 21 to adjust the output gate control signal Vg to clamp the drain-source voltage value Vds to the reference voltage value Vref. When the drain-source voltage value Vds is greater than the reference voltage value Vref, the adjustment signal Vadj is used to instruct the control circuit 21 to increase the output gate control signal Vg. When the drain-source voltage value Vds is less than the reference voltage value Vref, the adjustment signal Vadj is used to instruct the control circuit 21 to decrease the output gate control signal Vg.

[0089] Exemplarily, in this embodiment, when the drain-source voltage detection unit 241 is implemented by a differential amplifier unit DA, it can collect the drain voltage value Vd and the source voltage value Vs of the power switch Q through two input terminals during operation, perform differential processing (such as subtraction operation), and output the drain-source voltage value Vds.

[0090] When the operational amplifier unit 242 is implemented by an operational amplifier OA, it can compare the received drain-source voltage value Vds with the connected reference voltage value Vref, and when the two are inconsistent, calculate the difference between the two and output the adjustment signal Vadj according to the difference between the two. For example, the adjustment signal Vadj can be a difference signal between the drain-source voltage value Vds and the reference voltage value Vref or an amplified signal of the difference signal, and the adjustment trend of the adjustment signal Vadj (to increase or decrease the gate control signal Vg) is determined by the comparison result between the drain-source voltage value Vds and the reference voltage value Vref. Specifically, when the drain-source voltage value Vds is greater than the reference voltage value Vref, the adjustment signal Vadj is used to indicate that the gate control signal Vg is increased, and when the drain-source voltage value Vds is less than the reference voltage value Vref, the adjustment signal Vadj is used to indicate that the gate control signal Vg is decreased.

[0091] It can be understood that the drain-source voltage value Vds of the power switch Q is equal to the internal resistance value Ron of the power switch Q multiplied by the current value flowing through the power switch Q. Therefore, when the drain-source voltage value Vds is inconsistent with the reference voltage value Vref, in one embodiment, if the drain-source voltage value Vds is greater than the reference voltage value Vref, at this time, if the voltage clamping circuit 24 wants to clamp the drain-source voltage value Vds to the reference voltage value Vref, it can output the adjustment signal Vadj to indicate that the gate control signal Vg is increased to reduce the internal resistance value Ron of the power switch Q, thereby The drain-source voltage value Vds is reduced to achieve the goal of clamping the drain-source voltage value Vds at the reference voltage value Vref; in another embodiment, if the drain-source voltage value Vds is less than the reference voltage value Vref, at this time, if the voltage clamping circuit 24 wants to clamp the drain-source voltage value Vds to the reference voltage value Vref, it can output an adjustment signal Vadj to indicate that the gate control signal Vg is reduced to increase the internal resistance value Ron of the power switch Q, thereby increasing the drain-source voltage value Vds to achieve the goal of clamping the drain-source voltage value Vds at the reference voltage value Vref.

[0092] It can be understood that in the above-mentioned first embodiment, the reference voltage value Vref used to clamp the drain-source voltage value Vds can be a reference value preset in the intelligent electronic switch. At this time, the drain-source voltage value Vds can be clamped to the same reference voltage value Vref for different power switches Q, so as to achieve power consumption control of the power switch Q. However, when the intelligent electronic switch 20 is applied to different products or different scenarios, it may be necessary to clamp the drain-source voltage value Vds of the power switch Q to different reference voltage values ​​Vref for better power control. Exemplarily, the reference voltage value Vref can range from 20mv to 50mv. In one embodiment, the reference voltage value Vref is 20mv. In response to this demand, the present application provides a fifth embodiment to set different reference voltage values ​​Vref according to different user needs or scenario requirements.

[0093] For example, Figure 8 Schematic diagram of the circuit module of the intelligent electronic switch and its peripheral components provided in the fifth embodiment of the present application. Figure 8 As shown, in this embodiment, the intelligent electronic switch 20 may further include a reference voltage setting pin SET and a reference voltage setting circuit 25. The reference voltage setting circuit 25 is connected to the voltage clamp circuit 24 and the reference voltage setting pin SET. The reference voltage setting pin SET is also used to be connected to a first resistor R1. The first resistor R1 is used to set the size of the reference voltage value Vref based on the reference voltage setting circuit 25. The larger the resistance of the first resistor R1, the larger the reference voltage value Vref.

[0094] Continue to refer to Figure 8As shown, in this embodiment, the reference voltage setting circuit 25 may include a constant current source I1, one end of which is connected to the internal power supply terminal Vd, and the internal power supply terminal Vd may be understood as the output end of the power supply unit inside the intelligent electronic switch 20, and the other end of the constant current source I1 is connected to the reference voltage setting pin SET, and the reference voltage setting pin SET is also connected to the voltage clamping circuit 24, and is externally connected to the first resistor R1, so the reference voltage value Vref connected to the voltage clamping circuit 24 is equal to the voltage value at the reference voltage setting pin SET, and the voltage value at the reference voltage setting pin SET is equal to the output current of the constant current source I1 multiplied by the resistance value of the first resistor R1, so the reference voltage value Vref connected to the voltage clamping circuit 24 is equal to the output current of the constant current source I1 multiplied by the resistance value of the first resistor R1.

[0095] Specifically, after the voltage clamping circuit 24 of the intelligent electronic switch is designed, the current value output by the constant current source I1 is usually unchanged, because the voltage drop across the first resistor R1 can be changed by changing the resistance value of the first resistor R1, that is, the voltage value at the reference voltage setting pin SET can be changed. Exemplarily, when the resistance value of the first resistor R1 increases, the voltage drop across the first resistor R1, that is, the voltage value at the reference voltage setting pin SET increases, and accordingly, the reference voltage value Vref also increases; similarly, when the resistance value of the first resistor R1 decreases, the reference voltage value Vref also decreases.

[0096] The intelligent electronic switch provided in the embodiment of the present application is provided with a reference voltage setting pin and a reference voltage setting circuit, wherein the reference voltage setting pin is used to be connected to a first resistor. Thus, when the intelligent electronic switch is packaged into an integrated circuit chip or a chip product, the value of the internal reference voltage value thereof can be changed by changing the resistance value of the first resistor, thereby clamping the drain-source voltage value of the power switch to a different reference voltage value. The intelligent electronic switch can be applied to different application scenarios, meet different user needs, and enhance the competitiveness of products using the intelligent electronic switch.

[0097] It can be understood that other parts not described in detail in the above embodiments can refer to the contents recorded in other embodiments and will not be repeated here.

[0098] Optionally, based on the above embodiments, the present application embodiment further provides an integrated circuit chip, the integrated circuit chip comprising the above Figures 1 to 8 The intelligent electronic switch 20 provided in each embodiment, that is, the intelligent electronic switch 20 described above, can be fabricated on the same semiconductor substrate, wherein 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.

[0099] Optionally, other embodiments of the present application further provide a chip product, which may include the intelligent electronic switch 20 provided in the above embodiments, wherein the components of the intelligent electronic switch 20 except the power switch Q are located on a first integrated circuit chip, and the power switch Q is 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.

[0100] Among them, the power supply terminal VBAT is the power supply pin, the power ground terminal GND is the power ground pin, the input terminal INPUT is the input pin, the load output terminal OUT is the load output pin, the mode selection terminal EN is the mode selection pin, the power supply pin, the power ground pin, the input pin, and the mode selection pin are located on the first integrated circuit chip, and the load output pin is located on the second integrated circuit chip. 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.

[0101] In addition, in other embodiments of the present application, an electronic device is also provided, such as an automobile, headphones, mobile phones and other electronic products. Optionally, the automobile can be an electric car, such as an electric passenger car or an electric commercial vehicle, or a hybrid car, a fuel car, or a car. The electronic device may include the above Figures 1 to 8 The intelligent electronic switch 20 with integrated diode function shown in the figure or the integrated circuit chip or the chip product described above, in addition, the electronic device may also include a battery 10, a load 30 and a microcontroller 40. The positive electrode of the battery 10 is connected to the power supply terminal VBAT, the negative electrode of the battery 10 is connected to the power ground terminal GND, one end of the load 30 is connected to the load output terminal OUT, the other end of the load 30 is connected to the power ground terminal GND or the power supply terminal VBAT, the intelligent electronic switch 20 is connected to the microcontroller 40, for example, connected to the microcontroller 40 through the input terminal and the mode selection terminal, and the microcontroller 40 is used to control the intelligent electronic switch 20.

[0102] The battery 10 is generally a storage battery, which provides voltages such as 12V, 24V, 48V, 72V, 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. When the electronic device is a car, 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.

[0103] It is understandable that the intelligent electronic switch, integrated circuit chip, chip product, etc. with integrated diode function of this embodiment is not limited to use in consumer electronics and automotive electronics, but can also be used in industrial automation, aerospace and other fields, which will not be elaborated here.

[0104] 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.

[0105] 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 with integrated diode function, characterized in that: It includes a power supply terminal, a power ground terminal, an input terminal, a load output terminal, a power switch and a control circuit; The power supply end and the power ground end are used to be connected to a battery, the power switch is used to be connected in series with a load, a first end of the power switch is connected to the power supply end, a second end of the power switch is connected to the load output end, and a control end of the power switch is connected to the control circuit, and the control circuit is used to control the power switch to be turned on or off; It also includes a mode selection terminal and a substrate switching circuit, the substrate switching circuit includes a first switch and a second switch, the first switch is connected between the drain terminal and the substrate terminal of the power switch, the second switch is connected between the substrate terminal and the source terminal of the power switch, the control terminals of the first switch and the second switch are both connected to the control circuit, and the control circuit is also connected to the mode selection terminal and the input terminal; When the mode selection end receives a first signal, the control circuit controls the first switch to be turned off and the second switch to be turned on, and controls the switching state of the power switch based on the switch control signal received at the input end; when the mode selection end receives a second signal, the control circuit controls the first switch to be turned on and the second switch to be turned off, and controls the switching state of the power switch according to the voltage of the power supply end and the voltage of the load output end.

2. The intelligent electronic switch according to claim 1, characterized in that: The control circuit includes a voltage judgment unit and a first control unit, the voltage judgment unit is respectively connected to the mode selection end, the power supply end, and the load output end, and the first control unit is also connected to the mode selection end and the control end of the power switch; When the mode selection end receives the second signal, the voltage judgment unit starts working, and the voltage judgment unit is used to compare the voltage of the power supply end with the voltage of the load output end, and output a first level signal when the voltage of the power supply end is greater than the voltage of the load output end, so that the first control unit controls the power switch to turn on and conduct, and output a second level signal when the voltage of the power supply end is less than or equal to the voltage of the load output end, so that the first control unit controls the power switch to turn off and cut off.

3. The intelligent electronic switch according to claim 2, characterized in that: The power switch further comprises a shutdown circuit, wherein the shutdown circuit comprises a third switch and a fourth switch, wherein the third switch is connected between a drain terminal and a control terminal of the power switch, and the fourth switch is connected between a control terminal and a source terminal of the power switch, and the control terminals of the third switch and the fourth switch are both connected to the first control unit; The first control unit is used for controlling the third switch to be turned on and the fourth switch to be turned off when receiving the second level signal, so as to turn off the power switch.

4. The intelligent electronic switch according to claim 3, characterized in that: When the mode selection end receives a first signal and the input end receives a shutdown control signal, the first control unit is further configured to control the third switch to be turned off and the fourth switch to be turned on, so that the power switch is turned off.

5. The intelligent electronic switch according to any one of claims 1 to 4, characterized in that: It also includes a voltage clamping circuit, wherein the voltage clamping circuit is respectively connected to the source terminal and the drain terminal of the power switch, and the voltage clamping circuit is also connected to the control circuit; When the mode selection end receives the second signal and the power switch is turned on, the voltage clamping circuit is used to obtain the drain-source voltage value of the power switch and output an adjustment signal according to the drain-source voltage value and the connected reference voltage value, so that the control circuit adjusts the gate control signal output to the power switch to clamp the drain-source voltage value to the reference voltage value; wherein, when the drain-source voltage value is clamped to the reference voltage value, the smaller the gate control signal is, the shorter the time required for the power switch to be turned off.

6. The intelligent electronic switch according to claim 5, characterized in that: The voltage clamping circuit includes a drain-source voltage detection unit and an operational amplifier unit; The input end of the drain-source voltage detection unit is respectively connected to the drain end and the source end of the power switch, and the output end is connected to the operational amplifier unit. The operational amplifier unit is also used to access the reference voltage value. The operational amplifier unit is also connected to the control circuit. The drain-source voltage detection unit is used to obtain the drain voltage value and the source voltage value of the power switch and output the drain-source voltage value. The operational amplifier unit outputs an adjustment signal when the drain-source voltage value is inconsistent with the reference voltage value. The adjustment signal is used to instruct the control circuit to adjust the output gate control signal to clamp the drain-source voltage value to the reference voltage value.

7. The intelligent electronic switch according to claim 5, characterized in that: It also includes a reference voltage setting pin and a reference voltage setting circuit, wherein the reference voltage setting circuit is connected to the voltage clamping circuit and the reference voltage setting pin, and the reference voltage setting pin is also used to be connected to a first resistor, and the first resistor is used to set the reference voltage value based on the reference voltage setting circuit. The larger the resistance of the first resistor, the larger the reference voltage value.

8. An integrated circuit chip, characterized in that: An intelligent electronic switch with integrated diode function as claimed in any one of claims 1 to 7, wherein the power supply terminal is a power supply pin, the power ground terminal is a power ground pin, the input terminal is an input pin, the load output terminal is a load output pin, and the mode selection terminal is the mode selection pin.

9. A chip product, characterized in that: An intelligent electronic switch with integrated diode function as claimed in any one of claims 1 to 7, wherein the components of the intelligent electronic switch except the power switch are located on a first integrated circuit chip, and the power switch is 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, the input end is an input pin, the load output end is a load output pin, the mode selection end is a mode selection pin, the power supply pin, the power ground pin, the input pin, and the mode selection pin are located on a first integrated circuit chip, and the load output pin is located on a second integrated circuit chip.

10. An electronic device, characterized in that: An intelligent electronic switch with integrated diode function as claimed in any one of claims 1 to 7, or an integrated circuit chip as claimed in claim 8, or a chip product as claimed in claim 9; It also includes a battery, a load, and a microcontroller, wherein the positive electrode of the battery is connected to the power supply end, the negative electrode of the battery is connected to the power ground end, one end of the load is connected to the load output end, the other end of the load is connected to the power ground end, the intelligent electronic switch is connected to the microcontroller, and the microcontroller is used to control the intelligent electronic switch.

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