High-side smart electronic switches, integrated circuit chips, chip products and automobiles

Abstract

The present application provides a high-side intelligent electronic switch, an integrated circuit chip, a chip product and an automobile, wherein a voltage mutation detection circuit is connected between the control terminal of a power switch and the power ground terminal, and the voltage mutation detection circuit outputs a shutdown signal when a voltage mutation is detected at the control terminal of the power switch, and the control circuit is connected between the voltage mutation detection circuit and the drive circuit, and can output a cutoff control signal based on the received shutdown signal, so that the drive circuit controls the power switch to be turned off. In this solution, when a load is short-circuited, the voltage at the control terminal of the power switch will decrease rapidly to cause a mutation, so that the power switch is turned off in time when a voltage mutation is detected at the control terminal of the power switch, which can avoid the risk of the power switch being burned out.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent semiconductor switches, and in particular to a high-side 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 circuits. 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, in practical applications, the reliability requirements for smart electronic switches are relatively high. Among them, load short-circuit protection of smart electronic switches is an important item in the reliability requirements.

[0003] In the prior art, the load short-circuit protection of the intelligent electronic switch refers to controlling the power switch in the intelligent electronic switch to be turned off when the load is short-circuited, so as to prevent the power switch from being damaged due to excessive temperature. Specifically, a temperature detection circuit is set in the intelligent electronic switch. When the power switch is in the on state, if 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 detection circuit detects that the temperature of the power switch is too high, the temperature protection mechanism will be triggered to turn off the power switch. When the temperature drops below the set over-temperature protection threshold, the power switch will be controlled to turn on, thereby effectively avoiding the risk of the power switch tube being burned out.

[0004] However, in practical applications, the response time of the temperature detection circuit is limited by factors such as the relative position of the temperature sensor and the power switch, the detection sensitivity of the temperature sensor, etc. The above solution may have the problem of burning the power switch due to the untimely response of the temperature detection circuit. Summary of the invention

[0005] The present application provides a high-side intelligent electronic switch, an integrated circuit chip, a chip product and an automobile, which are used to solve the problems of low reliability and short service life of a power switch in a high-side intelligent electronic switch.

[0006] In a first aspect, the present application provides a high-side intelligent electronic switch, including a power supply terminal, a power ground terminal, a load output terminal, a power switch, a voltage mutation detection circuit, a control circuit and a drive circuit;

[0007] Wherein, the power supply terminal and the power ground terminal are used to be connected to a battery, and the load output terminal is used to be connected to a load;

[0008] The power switch is used to be connected in series with the load, with a first end connected to the power supply end, a second end connected to the load output end, and a control end connected to the drive circuit, and the drive circuit is used to control the power switch to turn on or off;

[0009] The voltage mutation detection circuit has a first end connected to the control end of the power switch, a second end connected to the power ground end, and an output end connected to the control circuit. The control circuit is also connected to the drive circuit, and the drive circuit is also connected to the second end of the power switch. The control circuit is used to control the working state of the drive circuit.

[0010] The voltage mutation detection circuit outputs a shutdown signal when a voltage mutation occurs at the control terminal of the power switch, and the control circuit outputs a cutoff control signal based on the received shutdown signal, so that the drive circuit controls the power switch to be turned off.

[0011] In a possible design of the first aspect, the voltage mutation detection circuit is used to obtain the control terminal voltage of the power switch when working, and judge whether the control terminal voltage has a mutation based on the voltage change information of the control terminal of the power switch relative to the power supply ground terminal.

[0012] As an example, the voltage mutation detection circuit includes a first enable terminal and a second enable terminal, the first enable terminal is used to access a drive control signal, the drive control signal is a turn-on control signal or a turn-off control signal, the second enable terminal is used to access a protection signal or a non-protection signal, and the control circuit is also used to access one of the protection signal and the non-protection signal and the drive control signal;

[0013] The voltage mutation detection circuit does not work when it receives a shutdown control signal and / or a protection signal, and works when it receives a start control signal and a non-protection signal at the same time; the control circuit is also used to control the power switch to be shut down via the drive circuit when it receives a shutdown control signal and / or a protection signal.

[0014] As another example, the voltage mutation detection circuit includes an enable terminal, and the enable terminal is used to access a protection signal or a non-protection signal;

[0015] The voltage mutation detection circuit does not work when it receives a protection signal, and works when it receives a non-protection signal.

[0016] Optionally, the voltage change information includes a magnitude relationship between time information required for the voltage of the control terminal to drop from a first voltage threshold to a second voltage threshold and reference time information, the second voltage threshold being less than the first voltage threshold and the second voltage threshold being greater than a maximum voltage value of the control terminal relative to the load output terminal when the power switch is normally turned on;

[0017] The voltage mutation detection circuit includes a first comparison unit, a second comparison unit, a timing unit and a third comparison unit; the first input end of the first comparison unit and the first input end of the second comparison unit are both connected to the control end of the power switch, the second input end of the first comparison unit is used to access the first voltage threshold, the second input end of the second comparison unit is used to access the second voltage threshold, the output end of the first comparison unit is connected to the timing unit, the output end of the second comparison unit is connected to the enable end of the third comparison unit, the timing unit is also connected to the first input end of the third comparison unit, and the second input end of the third comparison unit is used to access reference time information;

[0018] The first comparison unit outputs a timing signal when the voltage at the control terminal of the power switch is less than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the second comparison unit outputs an enable signal when the voltage at the control terminal of the power switch is less than or equal to a second voltage threshold, the third comparison unit compares the current timing information of the timing unit with the reference time information when receiving the enable signal, and outputs the shutdown signal when the current timing information is less than or equal to the reference time information.

[0019] Optionally, the voltage change information includes a magnitude relationship between a control terminal voltage and a second voltage threshold when reference time information is passed from a first moment, the first moment is a moment when the control terminal voltage drops to a first voltage threshold, the second voltage threshold is less than the first voltage threshold and the second voltage threshold is greater than a voltage value of the control terminal relative to a load output terminal when the power switch is normally turned on;

[0020] The voltage mutation detection circuit includes a first comparison unit, a timing unit, a second comparison unit and a third comparison unit; the first input end of the first comparison unit and the first input end of the second comparison unit are both connected to the control end of the power switch, the second input end of the first comparison unit is used to access the first voltage threshold, the second input end of the second comparison unit is used to access the second voltage threshold, the output end of the first comparison unit is connected to the timing unit, the timing unit is also connected to the first input end of the third comparison unit, the second input end of the third comparison unit is used to access the reference time information, and the output end of the third comparison unit is connected to the enable end of the second comparison unit;

[0021] The first comparing unit outputs a timing signal when the voltage at the control terminal of the power switch is less than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the third comparing unit outputs an enable signal when the real-time timing information reaches the reference time information, the second comparing unit compares the current control terminal voltage of the power switch with the second voltage threshold when receiving the enable signal, and outputs the shutdown signal when the current control terminal voltage is less than or equal to the second voltage threshold.

[0022] In another possible design of the first aspect, the driving circuit includes a charging unit, a charging switch, and a discharging switch;

[0023] 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, and the control end of the charging switch and the control end of the discharge switch are both connected to the control circuit;

[0024] When the control circuit outputs the cutoff control signal, the charging switch is turned off, and the discharging switch is turned on to discharge the charge at the control end of the power switch, so that the power switch is turned off.

[0025] In another possible design of the first aspect, the driving circuit includes a driving unit and a switching unit;

[0026] The driving unit and the switch unit are both connected to the control circuit, and are also both connected to the second end of the power switch. The driving unit is used to control the power switch to turn on or off, and the switch unit is used to discharge the charge of the control end of the power switch when it is turned on.

[0027] The control circuit controls the switch unit to turn on and conduct when receiving the shutdown signal, so as to quickly discharge the charge at the control end of the power switch, so that the power switch is turned off.

[0028] In another possible design of the first aspect, the control circuit includes a latch unit and a logic control unit;

[0029] The latch unit has a first input end connected to the output end of the voltage mutation detection circuit, a second input end for receiving a drive control signal, and an output end connected to the logic control unit, wherein the drive control signal is a start control signal or a shutdown control signal;

[0030] If the latch unit receives the shutdown signal while receiving the opening control signal, it enters a locked state and continuously outputs the first intermediate signal so that the logic control unit continuously outputs the cutoff control signal; if the latch unit receives the shutdown control signal in the locked state, the locked state is released.

[0031] In another possible design of the first aspect, the control circuit includes a latch unit and a logic control unit;

[0032] The latch unit has a first input end connected to the output end of the voltage mutation detection circuit, and an output end connected to the logic control unit, and the logic control unit is also used to access the drive control signal;

[0033] The latch unit enters a locking state and continuously outputs a first intermediate signal upon receiving the shutdown signal, and the logic control unit shields the driving control signal and outputs the cutoff control signal upon receiving the first intermediate signal.

[0034] Optionally, the high-side intelligent electronic switch further includes a shutdown detection circuit, and the shutdown detection circuit is connected to the second input terminal of the latch unit;

[0035] The shutdown detection circuit is used to detect whether the power switch is completely shut down, and output an unlock signal when it is determined that the power switch is completely shut down. The latch unit releases the locking state when receiving the unlock signal.

[0036] Optionally, the shutdown detection circuit includes a voltage detection unit;

[0037] The voltage detection unit has a first end connected to the control end of the power switch, a second end connected to the second end of the power switch, and an output end connected to the second input end of the latch unit. The voltage detection unit is used to detect the gate-source voltage signal of the power switch and output an unlocking signal when the gate-source voltage signal is equal to zero.

[0038] Optionally, the high-side intelligent electronic switch further includes a delay circuit;

[0039] The delay circuit has an input end connected to the output end of the shutdown detection circuit, and an output end connected to the second input end of the latch unit. The delay circuit is used to start timing when the unlocking signal is received and when the continuous timing information reaches the preset time information, the delay circuit outputs the delayed unlocking signal, and the latch unit releases the locked state when receiving the delayed unlocking signal.

[0040] In another possible design of the first aspect, the power switch is any one of an NMOS tube and a JFET, and / or the power switch is implemented as a silicon device, silicon carbide, gallium arsenide or gallium nitride.

[0041] In a second aspect, an embodiment of the present application provides an integrated circuit chip, comprising a high-side intelligent electronic switch as described in the first aspect and each 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.

[0042] In a third aspect, an embodiment of the present application provides a chip product, including the high-side intelligent electronic switch as described in the first aspect and each possible design, wherein the components of the high-side 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;

[0043] 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.

[0044] In a fourth aspect, an embodiment of the present application provides an automobile, comprising the high-side intelligent electronic switch as described in the first aspect and each possible design, or the integrated circuit chip as described in the second aspect, or the chip product as described in the third aspect;

[0045] 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 high-side intelligent electronic switch.

[0046] 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.

[0047] The high-side intelligent electronic switch, integrated circuit chip, chip product and automobile provided by the present application are connected between the control terminal of the power switch and the power ground terminal by a voltage mutation detection circuit. The voltage mutation detection circuit outputs a shutdown signal when a voltage mutation is detected at the control terminal of the power switch. The control circuit is connected between the voltage mutation detection circuit and the drive circuit, and can output a cutoff control signal based on the received shutdown signal to make the drive circuit control the power switch to be turned off. In this scheme, when a short circuit occurs in the load, the voltage at the control terminal of the power switch will decrease rapidly to cause a mutation. Therefore, when a voltage mutation is detected at the control terminal of the power switch, the power switch is turned off in time, which can avoid the risk of the power switch being burned out. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] 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.

[0049] Figure 1 This is a circuit module schematic diagram of a high-side intelligent electronic switch, a battery, a load, etc. provided in the first embodiment of the present application;

[0050] Figure 2A yes Figure 1 A schematic diagram of a possible control method of a high-side smart electronic switch is shown;

[0051] Figure 2B yes Figure 1 A schematic diagram of another possible control method of the high-side smart electronic switch shown;

[0052] Figure 3A This is a circuit module schematic diagram of a voltage mutation detection circuit in a high-side intelligent electronic switch provided in an embodiment of the present application;

[0053] Figure 3B yes Figure 3A Schematic diagram of the curve of the voltage at the middle control terminal changing with time;

[0054] Figure 3C This is another circuit module schematic diagram of a voltage mutation detection circuit in a high-side intelligent electronic switch provided in an embodiment of the present application;

[0055] Figure 3D yes Figure 3C Schematic diagram of the curve of the voltage at the middle control terminal changing with time;

[0056] Figure 4A This is a circuit module schematic diagram of a high-side intelligent electronic switch, a battery, a load, etc. provided in the second embodiment of the present application;

[0057] Figure 4BIt is another circuit module schematic diagram of a high-side intelligent electronic switch, a battery, a load, etc. provided in the second embodiment of the present application;

[0058] Figure 5A This is a circuit module schematic diagram of a high-side intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application;

[0059] Figure 5B It is another circuit module schematic diagram of a high-side intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application;

[0060] Figure 6 This is a circuit module schematic diagram of a high-side intelligent electronic switch, battery, load, etc. provided in the fourth 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, relays are gradually replaced by intelligent electronic switches, which are usually used to couple loads with batteries. It is an automatically operated electrical switch with one or more diagnostic capabilities and protection features, such as against overcurrent, overtemperature, overload and short circuit events. For example, there is a power switch in the intelligent electronic switch, so that in the case of overcurrent, overtemperature, overload or short circuit, the power switch will be turned off, so that the path between the battery and the load is disconnected, thereby protecting the power switch from damage and improving the reliability of the intelligent electronic switch.

[0066] In practical applications, especially when the power switch is connected to a variety of load types (for example, inductors, capacitors, resistors or a combination of the three) and the working environment is harsh, the possibility of overcurrent, overtemperature, overload and short circuit events in the smart electronic switch is high, which increases the reliability requirements of the application end for the smart electronic switch.

[0067] Among the one or more diagnostic capabilities and protection features of the intelligent electronic switch, short-circuit protection is a relatively important one. When the power switch is turned on, if the load connected to the power switch is short-circuited, an uncontrollable current will flow from the battery through the power switch to the ground. This may cause the power switch to withstand excessive instantaneous short-circuit power due to excessive current flowing through the power switch, thereby causing the power switch to burn out.

[0068] In the related art, in order to prevent the power switch from being burned, a temperature detection circuit can be set around the power switch. In this way, when the power on the power switch suddenly increases and causes the power switch to heat up rapidly, if the temperature detection circuit detects that the temperature of the power switch exceeds the over-temperature protection threshold, the temperature protection mechanism is triggered to shut down the power switch. However, the temperature detection circuit may have the problem of untimely response, resulting in the power switch not being shut down in time, and there is still a risk of burning out.

[0069] In response to the above technical problems, the inventors of the present application have proposed a new technical concept after long-term research. By judging whether the voltage at the control terminal of the power switch has a sudden change, it is determined whether to turn off the power switch. Specifically, the power switch is directly turned off when it is determined that the voltage at the control terminal of the power switch has a sudden change, thereby avoiding the risk of the power switch being damaged due to excessive temperature.

[0070] Based on the above technical concept, the embodiment of the present application provides a high-side intelligent electronic switch, by connecting the voltage mutation detection circuit between the control terminal of the power switch and the power ground terminal, the voltage mutation detection circuit outputs a shutdown signal when detecting a sudden change in the voltage at the control terminal of the power switch, and the control circuit is connected between the voltage mutation detection circuit and the drive circuit, and can output a cutoff control signal based on the received shutdown signal, so that the drive circuit controls the power switch to be turned off. In this solution, when the load is short-circuited, the voltage at the control terminal of the power switch will decrease rapidly to cause a sudden change, so that the power switch is turned off in time when a sudden change in the voltage at the control terminal of the power switch is detected, which can avoid the risk of the power switch being burned out.

[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 a high-side intelligent electronic switch for processing a load short circuit. Figure 1 1 is a schematic diagram of a circuit module of a high-side intelligent electronic switch, a battery, a load, etc. provided in the first embodiment of the present application. Figure 1 As shown, the high-side 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 voltage mutation detection circuit 21, a control circuit 22 and a drive circuit 23. 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] Continue to see Figure 1 As shown, the power switch Q1 is used to be connected in series with the load 30, with a first end connected to the power supply terminal VBAT, a second end connected to the load output terminal OUT, and a control end connected to the drive circuit 23, which is used to control the power switch Q1 to turn on or off. It can be understood that in the embodiment of the present application, the power switch Q1 is connected as a high-side switch, that is, a switch connected between the power supply terminal VBAT and the load 30.

[0074] In this embodiment, the voltage mutation detection circuit 21 has a first end connected to the control end of the power switch Q1, a second end connected to the power ground terminal GND, and an output end connected to the control circuit 22. The control circuit 22 is also connected to the drive circuit 23, and the drive circuit 23 is also connected to the second end of the power switch Q1.

[0075] Exemplarily, the voltage mutation detection circuit 21 can output a shutdown signal when the voltage at the control terminal of the power switch Q1 suddenly changes. Accordingly, the control circuit 22 outputs a cutoff control signal based on the received shutdown signal so that the drive circuit 23 controls the power switch Q1 to be turned off.

[0076] 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 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 N-type MOS tube is used as an example for illustration in the figure. 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. The embodiment of the present application does not limit the form of expression of the power switch Q1. It can be understood that in this embodiment, the power switch Q1 is an NMOS tube connected as a high-side switch.

[0077] In general, the control terminal voltage (gate voltage) of the power switch Q1 is equal to the sum of the gate-source voltage and the source voltage. When the power switch Q1 is working normally, the drain-source voltage of the power switch Q1 is small, the source voltage of the power switch Q1 is approximately equal to the voltage of the power supply terminal VBAT, and the control terminal voltage is approximately equal to VBAT+Vgs. Once the load 30 is short-circuited, the source voltage of the power switch Q1 is equivalent to being directly connected to the power ground terminal GND, so that the source voltage of the power switch Q1 is rapidly reduced from the voltage of the power supply terminal VBAT to approximately equal to 0, and the corresponding control terminal voltage of the power switch Q1 is approximately equal to 0+Vgs, that is, the gate voltage is rapidly reduced, so that the gate voltage of the power switch Q1 suddenly changes. Therefore, in this embodiment, the voltage sudden change detection circuit 21 is used to detect whether the control terminal voltage of the power switch Q1 suddenly changes, which can also be understood as detecting whether the load 30 connected to the power switch Q1 is short-circuited.

[0078] Optionally, in an embodiment of the present application, in order to protect the power switch Q1 from being burned out, the voltage mutation detection circuit 21 can output a shutdown signal when it detects that the gate voltage of the power switch Q1 has a mutation, so that the control circuit 22 outputs a cutoff control signal, so that the drive circuit 23 immediately turns off the power switch Q1.

[0079] In the high-side intelligent electronic switch provided in the embodiment of the present application, a voltage mutation detection circuit is used to detect whether a voltage mutation occurs at the control end of the power switch to determine whether a short circuit occurs at the load. When it is determined that a mutation occurs, a shutdown signal is output to the control circuit. The control circuit can output a cutoff control signal based on the shutdown signal to enable the drive circuit to control the power switch to be shut down. When a load short circuit occurs, the load short circuit can be detected in time and the power switch can be quickly shut down, thereby achieving the purpose of protecting the power switch from damage.

[0080] 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 high-side intelligent electronic switch 20.

[0081] Optional, in Figure 1 In the schematic diagram shown, the connection relationship between the voltage mutation detection circuit 21, the control circuit 22 and the drive circuit 23 and the power supply unit is not shown, but in actual application, a power supply unit can be set inside the high-side intelligent electronic switch 20, and the internal power supply unit is connected to the power supply terminal VBAT to reduce or increase 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 high-side intelligent electronic switch 20 may not be provided with a power supply unit inside. In this case, a boost or buck unit can 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 high-side intelligent electronic switch 20, so that the voltage at the power supply terminal VBAT can directly power certain circuits inside the high-side intelligent electronic switch 20, thereby ensuring that the high-side intelligent electronic switch 20 can work normally.

[0082] The above embodiment generally introduces the high-side intelligent electronic switch 20 . The following explains the specific implementations of the voltage mutation detection circuit 21 , the control circuit 22 and the drive circuit 23 in the high-side intelligent electronic switch 20 through different embodiments.

[0083] Optionally, in an embodiment of the present application, the voltage mutation detection circuit 21 is used to obtain the control terminal voltage of the power switch Q1 when working, and determine whether the control terminal voltage of the power switch Q1 has a mutation based on the voltage change information of the control terminal of the power switch Q1 relative to the power ground terminal GND.

[0084] Exemplarily, since one end of the voltage mutation detection circuit 21 is connected to the control end of the power switch Q1, and the other end thereof is connected to the power ground terminal GND, the voltage mutation detection circuit 21 actually obtains the voltage of the control end of the power switch Q1 relative to the power ground terminal GND, and then analyzes the change of the voltage, and determines whether the control end voltage of the power switch Q1 mutates based on the voltage change information.

[0085] Optionally, in an embodiment of the present application, the high-side intelligent electronic switch 20 may also be externally connected to a microprocessor to control the switch state of the power switch Q1 based on a drive control signal (input signal) received from the microprocessor. A protection mechanism for the power switch Q1 may also be provided inside the high-side intelligent electronic switch 20. For example, when the power switch Q1 triggers the high-side intelligent electronic switch 20 to generate a protection signal due to overcurrent, overheating, etc., the high-side intelligent electronic switch 20 may control the power switch Q1 to be turned off based on the protection signal.

[0086] In a possible design, in order to enable the high-side intelligent electronic switch 20 to distinguish between a sudden change in the control terminal voltage caused by a load short circuit, a sudden change in the control terminal voltage caused by the drive control signal (Input signal) controlling the power switch Q1 to be turned off, and a sudden change in the control terminal voltage caused by the protection mechanism (overtemperature, overcurrent, etc.) controlling the power switch Q1 to be turned off, in this embodiment, the following scheme can be adopted.

[0087] For example, Figure 2A yes Figure 1 A schematic diagram of a possible control method of the high-side smart electronic switch is shown in FIG. Figure 2A As shown, the voltage mutation detection circuit 21 includes a first enable terminal E1 and a second enable terminal E2, the first enable terminal E1 is used to access the drive control signal Input, the drive control signal is an on control signal ON or a shut-down control signal OFF, the second enable terminal E1 is used to access the protection signal or the non-protection signal, and accordingly, the control circuit is also used to access one of the protection signal and the non-protection signal and the drive control signal Input. In the embodiment of the present application, the non-protection signal can be understood as a non-signal of the protection signal.

[0088] Among them, the voltage mutation detection circuit 21 does not work when it receives the shutdown control signal OFF and / or the protection signal, and works when it receives the start control signal ON and the non-protection signal at the same time. The control circuit 22 is also used to control the power switch Q1 to be shut down via the drive circuit 23 when it receives the shutdown control signal OFF and / or the protection signal.

[0089] As an example, the voltage mutation detection circuit 21 does not work when it receives the shutdown control signal OFF and / or the protection signal. Therefore, when the control circuit 22 controls the power switch Q1 to be shut down via the drive circuit 23 based on the received shutdown control signal OFF and / or the protection signal, the voltage mutation detection circuit 21 will not detect whether the control terminal voltage of the power switch Q1 has a mutation, and thus will not output a shutdown signal, enabling the control circuit 20 to control the drive circuit 23 to shut down the power switch Q1 based on the existing shutdown mechanism.

[0090] As another example, the voltage mutation detection circuit 21 works normally only when it receives a start control signal from the first enable terminal E1 and does not receive a protection signal (that is, it receives a non-protection signal, which can also be interpreted as a non-signal of the protection signal); during normal operation, if the voltage mutation detection circuit 21 detects that the control terminal voltage of the power switch Q1 suddenly changes, it outputs a shutdown signal, prompting the control circuit 22 to output a cut-off shutdown signal, thereby quickly shutting down the power switch Q1 through the drive circuit 23.

[0091] In this embodiment, by setting the enabling conditions for the voltage mutation detection circuit 21 to work, that is, it only works when it receives the start control signal and does not receive the protection signal, it can accurately distinguish the control terminal voltage mutation caused by the load short circuit and the control terminal voltage mutation caused by the power switch being normally turned off, the power switch being turned off by the protection mechanism, etc., thereby improving the performance of the high-side intelligent electronic switch.

[0092] In this embodiment, the drive circuit 23 is used to control the switching state of the power switch Q1. Therefore, the circuit structure of the drive circuit 23 can affect the turn-off speed of the power switch Q1 and can greatly affect the safety of the power switch Q1. Figure 2A Based on the illustrated embodiment, an improved driving circuit is introduced below so as to increase the turn-off speed of the power switch when receiving a cut-off signal.

[0093] In another possible design, in order to enable the high-side intelligent electronic switch 20 to distinguish between a sudden change in the control terminal voltage caused by a load short circuit and a sudden change in the control terminal voltage caused by the protection mechanism (overtemperature, overcurrent, etc.) controlling the power switch Q1 to be turned off, the following solution may be adopted.

[0094] For example, Figure 2B yes Figure 1 The schematic diagram of another possible control method of the high-side intelligent electronic switch is shown in FIG. Figure 2BAs shown, the voltage mutation detection circuit 21 includes an enable terminal E, which is used to access a protection signal or a non-protection signal; accordingly, the voltage mutation detection circuit 21 does not work when it receives a protection signal, and works when it receives a non-protection signal.

[0095] In this embodiment, the voltage mutation detection circuit 21 does not work when receiving the protection signal, so that the control circuit 22 can control the power switch Q1 to be turned off and cut off through the drive circuit 23 based on the received protection signal. The voltage mutation detection circuit 21 will not detect whether the voltage at the control terminal of the power switch Q1 has a mutation, and the enable control circuit 20 will control the drive circuit 23 to turn off the power switch Q1 based on the existing shutdown mechanism. However, when the voltage mutation detection circuit 21 does not receive the protection signal from the enable terminal E, the voltage mutation detection circuit 21 works normally, and outputs a shutdown signal when detecting that the voltage at the control terminal of the power switch Q1 has a mutation, prompting the control circuit 22 to output a cut-off shutdown signal, thereby quickly turning off the power switch Q1 through the drive circuit 23.

[0096] In this embodiment, by setting the enabling condition for the voltage mutation detection circuit 21 to work, that is, it only works when no protection signal is received, it can accurately distinguish between the control terminal voltage mutation caused by load short circuit and the control terminal voltage mutation caused by the power switch shutdown triggered by the protection mechanism, thereby improving the performance of the high-side intelligent electronic switch.

[0097] Optionally, based on the above embodiment, the voltage mutation detection circuit 21 determines whether the voltage of the control terminal mutates according to the voltage change information of the control terminal of the power switch Q1 relative to the power ground terminal GND. For example, by setting two voltage thresholds (a first voltage threshold Vref1 and a second voltage threshold Vref2) and a reference time information Tref in the voltage mutation detection circuit 21, the change of the control terminal voltage is measured in turn, and then it is determined whether the voltage of the control terminal of the power switch Q1 mutates.

[0098] Among them, the first voltage threshold Vref1 and the second voltage threshold Vref2 are two working voltages of the control terminal relative to the power ground terminal GND when the power switch Q1 is normally turned on, the second voltage threshold Vref2 is less than the first voltage threshold Vref1 and greater than the maximum voltage value of the control terminal relative to the load output terminal when the power switch Q1 is normally turned on, and the reference time information Tref is the theoretical time information of the control terminal voltage dropping from the first voltage threshold Vref1 to the second voltage threshold Vref2.

[0099] For example, assuming that the voltage value Vgs of the control terminal relative to the load output terminal when the power switch Q1 is normally turned on is 4V at the maximum and 2.5V at the minimum, then Vref2 needs to be greater than 4V; in this embodiment, assuming that when the load is short-circuited, the voltage value Vgs of the control terminal of the power switch Q1 relative to the load output terminal is equal to 4V, and the voltage of the power supply terminal VBAT relative to the power ground terminal GND is 12V, then the voltage value of the control terminal relative to the power ground terminal GND is greater than 4V and less than or equal to 16V, so the first voltage threshold Vref1 and the second voltage threshold Vref2 can be two voltages between 4V and 16V. Values, for example, the first voltage threshold Vref1 is 15.5V, 15V, 14.5V, 14V, 13.5V, 13V, 12.5V, 12V, 11.5V, 11V, 10.5V, 10V, etc., and the second voltage threshold Vref2 is 4.5V, 5V, 5.5V, 6V, 6.5V, 7V, 7.5V, etc. For example, the first voltage threshold Vref1 is 15V, and the second voltage threshold Vref2 is 5V, etc. The embodiment of the present application does not limit the specific values ​​of the first voltage threshold Vref1 and the second voltage threshold Vref2, which can be set according to actual needs. The reference time information Tref can be set based on the specific values ​​of the first voltage threshold Vref1 and the second voltage threshold Vref2 and the time information required for the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2 when the power switch Q1 is normally turned off, which can be determined by calculation or experience.

[0100] In practical applications, the curve slope of the control terminal voltage caused by load short circuit is greater than the curve slope when the power switch Q1 is normally turned off. Based on this principle, a voltage mutation detection circuit can be designed to determine whether the control terminal voltage of the power switch Q1 has a mutation. For example, in this embodiment, the curve slope of the control terminal voltage when the power switch Q1 is normally turned off is A, and the curve slope of the control terminal voltage determined by the first voltage threshold Vref1, the second voltage threshold Vref2 and the reference time information Tref is B, then B is greater than A.

[0101] Optionally, in one possible design, the voltage change information includes the time information required for the control terminal voltage to drop from a first voltage threshold Vref1 to a second voltage threshold Vref2 and the size relationship of the reference time information Tref, wherein the second voltage threshold Vref2 is less than the first voltage threshold Vref1 and the second voltage threshold Vref2 is greater than the maximum voltage value of the control terminal relative to the load output terminal OUT when the power switch Q1 is normally turned on.

[0102] For example, Figure 3A This is a circuit module schematic diagram of a voltage mutation detection circuit in a high-side intelligent electronic switch provided in an embodiment of the present application. Figure 3Byes Figure 3A Schematic diagram of the curve of the voltage change of the control terminal over time. This embodiment explains a circuit structure and implementation principle of the voltage mutation detection circuit 21. Figure 3A As shown, in this possible design, the voltage mutation detection circuit 21 includes a first comparison unit Comp11, a second comparison unit Comp12, a timing unit 21A and a third comparison unit Comp13.

[0103] Optional, see Figure 3A As shown, the first input terminal of the first comparison unit Comp11 and the first input terminal of the second comparison unit Comp12 are both connected to the control terminal of the power switch Q1, the second input terminal of the first comparison unit Comp11 is used to access the first voltage threshold Vref1, the second input terminal of the second comparison unit Comp12 is used to access the second voltage threshold Vref2, the output terminal of the first comparison unit Comp11 is connected to the timing unit 21A, the output terminal of the second comparison unit Comp12 is connected to the enable terminal EN of the third comparison unit Comp13, the timing unit 21A is also connected to the first input terminal of the third comparison unit Comp13, and the second input terminal of the third comparison unit Comp13 is used to access the reference time information Tref.

[0104] In this embodiment, combined with Figure 3B As shown, the first comparison unit Comp11 outputs a timing signal when the voltage at the control terminal of the power switch Q1 is less than or equal to the first voltage threshold Vref1, the timing unit 21A starts timing and outputs real-time timing information when receiving the timing signal, the second comparison unit Comp12 outputs an enable signal when the voltage at the control terminal of the power switch Q1 is less than or equal to the second voltage threshold Vref2, and the third comparison unit Comp13 compares the current timing information t1 of the timing unit 21A with the reference time information Tref when receiving the enable signal, and outputs a shutdown signal when the current timing information t1 is less than or equal to the reference time information Tref.

[0105] In the embodiment of the present application, the first input terminal of the comparison unit (the first comparison unit Comp11, the second comparison unit Comp12, and the third comparison unit Comp13) is explained as the inverting terminal, and the second input terminal is the non-inverting terminal. Accordingly, the shutdown signal is a high-level signal. In the voltage mutation detection circuit 21, by comparing the time information required for the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2 with the reference time information Tref, it can be determined whether the control terminal voltage has a mutation.

[0106] For example, in this embodiment, continue to refer to Figure 3A and Figure 3BAs shown, the first comparison unit Comp11 compares the control terminal voltage Vg of the power switch Q1 with the first voltage threshold Vref1. When the control terminal voltage Vg1 is less than or equal to the first voltage threshold Vref1, the first comparison unit Comp11 determines that the control terminal voltage drops to less than or equal to the first voltage threshold Vref1, and then outputs a timing signal, so that the timing unit 21A starts timing and outputs the real-time timing duration. The second comparison unit Comp12 compares the control terminal voltage Vg of the power switch Q1 with the second voltage threshold Vref2. When the control terminal voltage Vg2 is less than or equal to the second voltage threshold Vref2, the second comparison unit determines that the control terminal voltage drops to less than or equal to the first voltage threshold Vref2. If the current timing information t1 is less than or equal to the reference time information Tref, it indicates that the time information required for the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2 is equal to the reference time information Tref or less than the reference time information Tref, and the slope of the curve of the control terminal voltage is large, it is considered that the voltage of the control terminal has undergone a sudden change in voltage, so the third comparison unit Comp13 outputs a shutdown signal to turn off the power switch Q1. If the current timing information t1 is greater than the reference time information Tref, it indicates that the time information required for the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2 is longer than the first reference time length Tref, and the slope of the curve of the control terminal voltage is small, it is considered that the voltage of the control terminal has not undergone a sudden change in voltage, and no shutdown signal is output.

[0107] It can be understood that in this embodiment, the principle of measuring whether the control terminal voltage has a sudden change can be summarized as follows: the relationship between the time information t1 required for the control terminal voltage to drop a preset voltage (the difference between the first voltage threshold Vref1 and the second voltage threshold Vref2) and the reference time information Tref. If the current timing information t1 is less than or equal to the reference time information Tref, it is considered that the control terminal voltage has a sudden change. If the current timing information t1 is greater than the reference time information Tref, it is considered that the control terminal voltage has not a sudden change.

[0108] In another possible design, the voltage change information includes the relationship between the control terminal voltage and the second voltage threshold Vref2 when the reference time information is passed from the first moment, the first moment is the moment when the control terminal voltage drops to the first voltage threshold Vref1, the second voltage threshold Vref2 is less than the first voltage threshold Vref1 and the second voltage threshold Vref2 is greater than the voltage value of the control terminal relative to the load output terminal when the power switch Q1 is normally turned on.

[0109] For example, Figure 3C This is another circuit module schematic diagram of the voltage mutation detection circuit in the high-side intelligent electronic switch provided in an embodiment of the present application. Figure 3D yes Figure 3C Schematic diagram of the curve of the voltage change of the control terminal over time. This embodiment explains another circuit structure and implementation principle of the voltage mutation detection circuit 21. Figure 3C As shown, in this possible design, the voltage mutation detection circuit 21 includes a first comparison unit Comp21, a timing unit 21B, a second comparison unit Comp22 and a third comparison unit Comp23. Figure 3C and Figure 3A The structures are somewhat similar, except that Figure 3A In the process, it is determined whether the voltage at the control terminal suddenly changes based on the relationship between the time information required for the preset voltage to drop and the reference time information Tref. Figure 3C Whether the voltage of the control terminal changes suddenly is determined by comparing the voltage value of the voltage of the control terminal after the reference time information Tref is passed from the first voltage threshold Vref1 to the second voltage threshold Vref2.

[0110] Specifically, in this possible design, refer to Figure 3C As shown, the first input terminal of the first comparison unit Comp21 and the first input terminal of the second comparison unit Comp22 are both connected to the control terminal of the power switch Q1, the second input terminal of the first comparison unit Comp21 is used to access the first voltage threshold Vref1, the second input terminal of the second comparison unit Comp22 is used to access the second voltage threshold Vref2, the output terminal of the first comparison unit Comp21 is connected to the timing unit 21B, the timing unit 21B is also connected to the first input terminal of the third comparison unit Comp23, the second input terminal of the third comparison unit Comp23 is used to access the reference time information Tref, and the output terminal of the third comparison unit Comp23 is connected to the enable terminal of the second comparison unit Comp22.

[0111] Continue to refer to Figure 3C and Figure 3D As shown, the first comparison unit Comp21 outputs a timing signal when the voltage Vg1 at the control terminal of the power switch Q1 is less than or equal to the first voltage threshold Vref1, the timing unit 21B starts timing and outputs real-time timing information when receiving the timing signal, the third comparison unit Comp23 outputs an enable signal EN when the real-time timing information reaches the reference time information Tref, and the second comparison unit Comp22 compares the current control terminal voltage of the power switch Q1 with the second voltage threshold Vref2 when receiving the enable signal EN, and outputs a shutdown signal off when the current control terminal voltage Vg2 is less than or equal to the second voltage threshold Vref2.

[0112] For example, in this embodiment, continue to refer to Figure 3C and Figure 3D As shown, the first comparison unit Comp21 compares the control terminal voltage Vg of the power switch Q1 with the first voltage threshold Vref1. When the control terminal voltage Vg1 is less than or equal to the first voltage threshold Vref1, the first comparison unit Comp21 determines that the control terminal voltage drops to less than or equal to the first voltage threshold Vref1, and then outputs a timing signal, so that the timing unit 21B starts timing and outputs real-time timing information. The third comparison unit Comp23 compares the real-time timing information with the first reference time length Tref, and outputs an enable signal EN when the real-time timing information reaches the reference time information Tref, that is, the real-time timing information is greater than or equal to the reference time information Tref, so that the second comparison unit Comp23 starts timing and outputs the real-time timing information. The unit Comp22 starts to work, and the second comparison unit Comp22 compares the collected control terminal voltage Vg2 with the second voltage threshold Vref2. When it is determined that the control terminal voltage Vg2 of the power switch Q1 is less than or equal to the second voltage threshold Vref2, it indicates that the current control terminal voltage value Vg2 when the reference time information Tref is passed from the control terminal voltage falling to the first voltage threshold Vref1 is equal to the second voltage threshold Vref2 or is smaller than the second voltage threshold Vref2, that is, the voltage change is large, and it is considered that the curve slope of the control terminal voltage is large, and the control terminal voltage has a sudden voltage change. The second comparison unit Comp22 outputs a shutdown signal to turn off the power switch Q1. When the second comparison unit Comp22 determines that the control terminal voltage of the power switch Q1 is greater than the second voltage threshold, it indicates that the current voltage value Vg2 when the reference time information Tref is passed from the control terminal voltage falling to the first voltage threshold Vref1 is greater than the second voltage threshold Vref2, that is, the voltage change is small, and it is considered that the curve slope of the control terminal voltage is small, and the control terminal voltage has not undergone a sudden voltage change, and the shutdown signal is not output.

[0113] It can be understood that in this embodiment, the principle of measuring whether the control terminal voltage has a sudden change can be summarized as follows: the control terminal voltage Vg starts to count down from when it drops to the first voltage threshold Vref1, and the current voltage Vg2 of the control terminal after the reference time information Tref is related to the second voltage threshold Vref2. If the current control terminal voltage Vg2 is less than or equal to the second voltage threshold Vref2, it is considered that the control terminal voltage has a sudden change; if the current control terminal voltage is greater than the second voltage threshold Vref2, it is considered that the control terminal voltage has not a sudden change.

[0114] Understandably, FIG. 3A to FIG. 3DIn the illustrated embodiment, the reference time information Tref, current timing information, real-time timing information, etc. may be characterized by duration, or by voltage information, pulse number, etc. For example, if the reference time information Tref is reference voltage information, the real-time timing information is voltage change information within the real-time timing duration; if the reference time information Tref is reference pulse number, the real-time timing information is the pulse number change within the real-time timing duration, etc. In other embodiments, the reference time information Tref, current timing information, real-time timing information, etc. may also be characterized by other methods, which are not limited in this embodiment.

[0115] In this embodiment, the voltage mutation detection circuit 21 can timely and accurately determine whether the control terminal voltage has a mutation according to the control terminal voltage of the power switch Q1, that is, determine whether the load 30 is short-circuited. If so, a shutdown signal is output to enable the control circuit 22 to promptly shut down the power switch Q1 through the drive circuit 23, thereby protecting the power switch Q1 from being damaged and responding quickly to load short circuit.

[0116] Optionally, based on the above embodiments, the embodiments of the present application may further provide two possible implementation schemes of the driving circuit, so that the driving circuit increases the turn-off speed of the power switch when receiving the cut-off control signal.

[0117] In one possible implementation, Figure 4A 1 is a schematic diagram of a circuit module of a high-side intelligent electronic switch, a battery, a load, etc. provided in the second embodiment of the present application. Figure 4A As shown, in the high-side intelligent electronic switch 20 , the driving circuit 23 includes a charging unit 23A, a charging switch M1 and a discharging switch M2 .

[0118] Among them, the charging unit 23A 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 g of the power switch Q1, the two ends of the discharge switch M2 are correspondingly connected to the control end and the second end of the power switch Q1, and the control end of the charging switch M1 and the control end of the discharge switch M2 are both connected to the control circuit 22.

[0119] In this embodiment, when the control circuit 22 outputs the cutoff control signal, the charging switch M1 is turned off and the discharging switch M2 is turned on to discharge the charge at the control end of the power switch Q1 so that the power switch Q1 is turned off.

[0120] Optionally, the voltage of the first power supply terminal is higher than the voltage of the power supply terminal VBAT. The first power supply terminal may be an output terminal of a boost circuit. The boost circuit may be, for example, a charge pump (CP) circuit. Figure 2B In the example, the first power supply end is identified by CP.

[0121] In this embodiment, the traditional drive control circuit is modified, for example, only the discharge switch M2 is connected to the discharge branch between the control end of the power switch Q1 and the load output end OUT, so that when the control circuit 22 outputs the cut-off control signal, the discharge switch M2 is turned on, and the charge at the control end of the power switch Q1 can be quickly discharged through the discharge switch M2, so that the power switch Q1 is quickly turned off, thereby reducing the probability of damage to the power switch Q1.

[0122] It can be understood that, under normal circumstances, when the control circuit 22 outputs a shutdown control signal, the charging switch M1 is turned off and the discharging switch M2 is turned on, and the charge at the control end of the power switch Q1 is discharged through the discharging switch M2, so that the power switch Q1 is turned off; when the control circuit 22 outputs an on control signal, the charging switch M1 is turned on and the discharging switch M2 is turned off. At this time, the first power supply end can charge the parasitic capacitance of the power switch Q1 through the charging unit 23A and the charging switch 23A, thereby increasing the voltage at the control end and turning on the power switch Q1.

[0123] It is understandable that this embodiment only describes one implementation of the driving circuit, and the driving circuit can also be designed based on actual needs, which is not described in detail here.

[0124] In another possible implementation, Figure 4B 1 is another circuit module schematic diagram of a high-side intelligent electronic switch, a battery, a load, etc. provided in the second embodiment of the present application. Figure 4B As shown, in the high-side intelligent electronic switch 20 , the driving circuit 23 includes a driving unit 231 and a switch unit 232 .

[0125] Among them, the driving unit 231 and the switch unit 232 are both connected to the control circuit 22, and the driving unit 231 and the switch unit 232 are also both connected to the second end of the power switch Q1. The driving unit 231 is used to control the power switch Q1 to turn on or off, and the switch unit 232 is used to discharge the charge of the control end of the power switch Q1 when it is turned on.

[0126] In this embodiment, when receiving the shutdown signal, the control circuit 22 controls the switch unit 232 to turn on and discharge the charge at the control terminal of the power switch Q1 , so that the power switch Q1 is turned off.

[0127] Optionally, in this embodiment, the driving unit 231 may be a conventional driving control circuit, which can control the switching state of the power switch Q1 when receiving a driving control signal. Figure 4BAs shown, the driving unit 231 includes a charging unit 2311, a charging switch M1, a discharging switch M2 and a discharging unit 2312 connected in series, wherein the charging unit 2311 and the charging switch M1 form a charging branch, and the discharging switch M2 and the discharging unit 2312 form a discharging branch. One end of the charging branch is connected to the first power supply end, and the other end thereof is connected to the control end of the power switch Q1. One end of the discharging branch is connected to the control end of the power switch Q1, and the other end thereof is connected to the load output end OUT. The switching states of the charging switch M1 and the discharging switch M2 are controlled by the driving control signal output by the control circuit 22, thereby being able to control the switching state of the power switch Q1. Figure 4A Similar to Figure 4B In the example, the first power supply end is also identified by CP.

[0128] It can be understood that, under normal circumstances, when the voltage mutation detection circuit 21 does not output a shutdown signal, the control circuit 22 can output a drive control signal based on the received drive control signal or protection signal. For example, when the control circuit 22 receives a protection signal, it outputs a shutdown control signal and outputs it to the charging switch M1 and the discharging switch M2 of the driving unit 231, prompting the charging switch M1 to be turned off and the discharging switch M2 to be turned on. The charge at the control end of the power switch Q1 will be discharged through the discharge branch formed by the discharging switch M2 and the discharging unit 2312, so that the power switch Q1 is turned off. That is, in the discharge circuit of the driving unit 231, due to the presence of the discharging unit 2312, the discharge speed of the power switch Q1 can be controlled, but when the load is short-circuited, the speed of discharging the charge in this way is limited, which is not conducive to protecting the safety of the power switch Q1.

[0129] In this example, by setting a switch unit 232 between the control end of the power switch Q1 and the load output end OUT, when the voltage mutation detection circuit 21 detects that the load 30 is short-circuited and outputs a shutdown signal, the control circuit 22 can quickly shut down the power switch Q1 via the switch unit 2312 of the drive circuit 22. For example, when the control circuit 22 receives the shutdown signal, it will shield the received drive control signal and output a cut-off control signal, so that the switch unit 232 is turned on and a discharge path is formed between the control end of the power switch Q1 and the ground, so that the charge at the control end of the power switch Q1 is quickly discharged to the ground through the switch unit 232, so that the voltage at the control end of the power switch Q1 is quickly reduced to zero, thereby increasing the speed at which the power switch Q1 is turned off.

[0130] Optionally, the charging unit 2311 and the discharging unit 2312 can be any one of a constant current source, a depletion-type switch tube or a resistor. The charging unit 2311 is mainly used to provide a stable current to charge the parasitic capacitance of the power switch Q1 to control the power switch Q1 to turn on, and the discharging unit 2312 is mainly used to control the discharge speed of the parasitic capacitance of the power switch Q1 to control the shutdown speed of the power switch Q1.

[0131] Understandably, Figure 4B In the embodiment shown, a logic NOT gate is connected between the control circuit 22 and the control end of the charging switch M1, and no logic NOT gate is connected between the control circuit 22 and the control end of the discharge switch M2 for exemplary description. The logic NOT gate can indicate that the control signals output to the charging switch M1 and the discharge switch M2 are different, that is, when the control circuit 22 outputs an on control signal, the discharge switch M2 is off when the charging switch M1 is turned on, and when the control circuit 22 outputs a off control signal, the charging switch M1 is in an off state when the discharge switch M2 is turned on. Of course, in other embodiments, a logic circuit may be connected between the control circuit 22 and the discharge switch M2, or no logic circuit may be connected between the control circuit 22 and the charging switch M1 and / or the discharge switch M2, which can be determined according to the types of the charging switch M1 and the discharge switch M2, and is not limited here.

[0132] In practical applications, other circuit elements are connected between the gate g and the source s of the power switch Q1, for example, a resistor, a Zener tube or at least one switch tube (NMOS or PMOS). When the power switch Q1 works normally, the charging unit 2311 can provide a stable current to the gate of the power switch Q1, so that the power switch Q1 works in the linear region and is used as a switch. When the voltage at the control end of the power switch Q1 suddenly changes, the voltage sudden change detection circuit 21 outputs a shutdown signal, so that the control circuit 22 outputs a cut-off control signal, thereby turning on the switch unit 232. The charge at the control end can be directly discharged through the switch unit 232, thereby improving the charge discharge speed and the shutdown speed of the power switch.

[0133] In this solution, a switch unit is set between the control end of the power switch and the load output end. When the control circuit outputs a cutoff control signal, the cutoff control signal can turn on the switch unit, thereby quickly lowering the voltage at the control end of the power switch to completely shut down the power switch. This can effectively avoid the risk of the power switch being burned out due to overheating.

[0134] Optionally, in this embodiment, the control circuit 22 is used to control the switching state of the power switch Q1 via the drive circuit 23 based on the received signal, that is, the switching state of the power switch Q1 may be different depending on the signal received by the control circuit 22. The specific implementation of the control circuit 22 is explained below through two examples.

[0135] As an example, based on the above embodiments, Figure 5A 1 is a schematic diagram of a circuit module of a high-side intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application. Figure 5A As shown, the control circuit 22 includes a latch unit 221 and a logic control unit 222 .

[0136] Among them, the latch unit 221 has a first input end connected to the output end of the voltage mutation detection circuit 21, a second input end for receiving the drive control signal Input, and an output end connected to the logic control unit 222. The drive control signal Input is an on control signal ON or an off control signal OFF.

[0137] In this example, if the latch unit 221 receives a shutdown signal while receiving the on control signal ON, it enters a locked state and continuously outputs an intermediate signal so that the logic control unit 222 continuously outputs a cutoff control signal; if the latch unit 221 receives a shutdown control signal in the locked state, the locked state is released.

[0138] Optionally, when the power switch Q1 is in the on state, that is, when the latch unit 221 is receiving the on control signal ON, if the load 30 connected to the power switch Q1 is suddenly short-circuited, the voltage mutation detection circuit 21 will output a shutdown signal after judgment, so that the latch unit 221 enters a locked state and continuously outputs a first intermediate signal. The first intermediate signal may include characteristic information of the shutdown signal, so that the logic control unit 222 can continuously output a cutoff control signal so that the drive circuit 23 controls the power switch Q1 to be turned off.

[0139] Exemplarily, when the driving control signal (Input signal) received by the latch unit 221 changes, for example, when the Input signal changes from an on control signal to an off control signal, the latch unit 221 can release the locked state, so that the latch unit 221 can output a second intermediate signal based on the received Input signal in the subsequent process, and the second intermediate signal contains characteristic information of the Input signal, thereby causing the logic control unit 222 to output a corresponding control signal, thereby controlling the switching state of the power switch Q1. That is, after the latch unit 221 enters the locked state based on the off signal output by the voltage mutation detection circuit 21, it will continue to be in the locked state, and will only be unlocked when the external microprocessor outputs the driving control signal (Input signal), so that the power switch Q1 can be effectively avoided from being frequently turned on and off unnecessarily, and the safety of the power switch can be effectively protected.

[0140] It is understandable that the logic control unit 222 can also receive a protection signal, in which case it can output a shutdown control signal and control the power switch Q1 to be turned off via the drive circuit 23 .

[0141] As another example, Figure 5B 1 is another circuit module schematic diagram of a high-side intelligent electronic switch, a battery, a load, etc. provided in the third embodiment of the present application. Figure 5B As shown, the control circuit 22 includes a latch unit 221 and a logic control unit 222 .

[0142] The latch unit 221 has a first input terminal connected to the output terminal of the voltage mutation detection circuit 21, and an output terminal connected to the logic control unit 222. The logic control unit 222 is also used to access the drive control signal Input signal. When the latch unit 221 receives the shutdown signal, it enters a locked state and continuously outputs the first intermediate signal. When the logic control unit 222 receives the first intermediate signal, it shields the drive control signal and outputs a cutoff control signal.

[0143] Optionally, a latch unit 221 is provided in the control circuit 22 so that the control circuit 22 can continuously output a cut-off control signal. That is, the latch unit 221 can enter a locked state when receiving a shutdown signal, and continuously output the first intermediate signal in the locked state so that the logic control unit 222 shields the received drive control signal and keeps outputting the cut-off control signal until the power switch Q1 is completely turned off.

[0144] In this solution, the shutdown signal output by the voltage mutation detection circuit is latched and output by the latch unit included in the control circuit, which can ensure that the power switch can be successfully shut down when the voltage at the control end of the power switch suddenly changes due to a load short circuit or other abnormalities, thereby effectively reducing the risk of the power switch being burned out.

[0145] For example, in Figure 5A and Figure 5B In the embodiment, the latch unit 221 can be implemented by an RS trigger. For example, the R end of the latch unit 221 is connected to the voltage mutation detection circuit 21 or connected to the Input signal, the S end of the latch unit 221 is connected to the voltage mutation detection circuit 21, and the output end of the latch unit 221 is connected to the logic control unit 222.

[0146] Optional, in the above Figure 5B Based on the embodiment shown, Figure 6 1 is a schematic diagram of a circuit module of a high-side intelligent electronic switch, a battery, a load, etc. provided in the fourth embodiment of the present application. Figure 6 As shown, the high-side intelligent electronic switch 20 further includes a turn-off detection circuit 24 , and the turn-off detection circuit 24 is connected to the second input terminal of the latch unit 221 .

[0147] In this embodiment, the shutdown detection circuit 24 is used to detect whether the power switch Q1 is completely turned off, and output an unlock signal when it is determined that the power switch Q1 is completely turned off. The latch unit 221 releases the locking state upon receiving the unlock signal.

[0148] In practical applications, the shutdown detection circuit 24 can detect whether the power switch Q1 is completely shut down and cut off in a variety of ways. For example, the shutdown detection circuit 24 can determine whether the power switch Q1 is completely shut down and cut off by detecting the gate-source voltage or output current of the power switch Q1 or the duration of the shutdown signal or the duration of the cutoff control signal.

[0149] As an example, in the high-side intelligent electronic switch 20, the shutdown detection circuit 24 is implemented by a voltage detection circuit (not shown). For example, the two ends of the voltage detection circuit can be connected to the control end of the power switch Q1 and the second end of the power switch Q1, and the output end thereof is connected to the second input end of the latch unit 221. The voltage detection circuit is used to detect the gate-source voltage signal of the power switch Q1, and output an unlocking signal when the gate-source voltage signal is equal to zero, so as to release the locking state of the latch unit 221.

[0150] In practical applications, the voltage detection circuit is actually a gate-source voltage detection circuit of the power switch Q1, and its two ends are connected to the control end (gate) and source of the power switch Q1, respectively, and the gate voltage and 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 source voltage. Since the gate-source voltage signal of the power switch Q1 is less than or equal to the preset voltage threshold, such as 0, when the power switch Q1 is in the off state, the voltage detection circuit can detect the gate-source voltage signal of the power switch Q1 in real time. If it is detected that the gate-source voltage signal is less than or equal to the preset voltage threshold, such as Vgs=0, it is considered that the power switch Q1 has been successfully turned off, and it can output an unlocking signal to release the locking state of the latch unit 221, so as to clear the shutdown signal latched in the latch unit 221, so that the latch unit 221 no longer continuously outputs the shutdown signal.

[0151] Optionally, when the latch unit 221 does not output the shutdown signal, the logic control unit 222 may control the drive circuit 23 based on the received drive control signal, so that the drive circuit 23 controls the switching state of the power switch Q1 based on the drive control signal.

[0152] Optionally, as another example, in the high-side intelligent electronic switch 20, the shutdown detection circuit 24 can be implemented by a current detection circuit (not shown). The input end of the current detection circuit can be connected to the branch where the power switch Q1 is located or to the power switch Q1, and its output end can be connected to the latch unit 221. The current detection circuit can detect the output current of the power switch Q1. When the output current of the power switch Q1 is equal to 0, it is considered that the power switch Q1 at this time has been successfully turned off, and an unlocking signal can be output to release the locking state of the latch unit 221, so that the latch unit 221 no longer continuously outputs the shutdown signal. Therefore, after the latch unit 221 releases the locking state, the control circuit 22 can control the drive circuit 23 based on the received drive control signal, so that the drive circuit 23 controls the switch state of the power switch Q1 based on the drive control signal. In this embodiment, a current detection circuit is added to detect the output current of the power switch Q1. When the output current of the power switch Q1 is equal to zero, the shutdown signal of the latch unit 221 is cleared so that the control circuit 22 can control the working state of the drive circuit 23 based on the received drive control signal.

[0153] In an embodiment of the present application, when the voltage mutation detection circuit 21 outputs a shutdown signal that needs to shut down the power switch, the latch unit provided in the control circuit 22 can latch the shutdown signal, so that the control circuit shields the drive control signal and continuously outputs the cutoff control signal. When the power switch is completely turned off, the locking state of the latch unit can be automatically released, and the shielding of the drive control signal can be released, so that the high-side intelligent electronic switch can be turned on normally. It can automatically unlock the situation where a short circuit can be immediately contacted, thereby improving the intelligence of the high-side intelligent electronic switch and improving the user experience.

[0154] Optional, continue to refer to Figure 6 As shown, in this embodiment, in order to further ensure that the power switch Q1 can work normally when it is turned on again, a delay circuit 25 can be further provided in the high-side intelligent electronic switch 20, and the delay circuit 25 can be connected between the shutdown detection circuit 24 and the latch unit 221.

[0155] Exemplarily, the input end of the delay circuit 25 is connected to the output end of the shutdown detection circuit 24, and the output end is connected to the second input end of the latch unit 221. The delay circuit 25 is used to start timing when an unlocking signal is received, and when the continuous timing information reaches the preset time information, the delay circuit 25 outputs a delayed unlocking signal, and the latch unit 221 releases the locked state when receiving the delayed unlocking signal.

[0156] In this embodiment, the delay circuit is arranged between the shutdown detection circuit and the latch unit, that is, after the shutdown detection circuit outputs the unlocking signal, it needs to be delayed by the delay circuit. For example, the unlocking signal can be output to the latch unit only after the delay of the preset time information, so that the latch unit is unlocked only after the power switch is completely closed for the preset time information. This can effectively reduce the risk of overheating when the power switch is turned on again, thereby ensuring the safe use of the power switch.

[0157] It can be understood that other parts not recorded in the above embodiments can refer to the records in other embodiments of the present application and will not be described in detail here.

[0158] Optionally, based on the above embodiments, the embodiment of the present application further provides an integrated circuit chip, the integrated circuit chip includes the high-side intelligent electronic switch 20 in the above embodiments, that is, the above-mentioned high-side 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.

[0159] Optionally, other embodiments of the present application further provide a chip product, which may include the above-mentioned high-side intelligent electronic switch 20, wherein components of the high-side intelligent electronic switch 20 other than the power switch Q1 (for example, a voltage mutation detection circuit, a control circuit, and a drive circuit, etc.) are located on a first integrated circuit chip, and the power switch Q1 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.

[0160] 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.

[0161] 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 a high-side intelligent electronic switch 20.

[0162] 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.

[0163] The microcontroller is connected to the high-side intelligent electronic switch for controlling the high-side intelligent electronic switch. Meanwhile, the high-side 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.

[0164] It is understandable that the high-side 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.

[0165] 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.

[0166] 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. A high-side intelligent electronic switch, characterized in that: It includes a power supply terminal, a power ground terminal, a load output terminal, a power switch, a voltage mutation detection circuit, a control circuit and a drive circuit; Wherein, the power supply terminal and the power ground terminal are used to be connected to a battery, and the load output terminal 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, a second end connected to the load output end, and a control end connected to the drive circuit, and the drive circuit is used to control the power switch to turn on or off; The voltage mutation detection circuit has a first end connected to the control end of the power switch, a second end connected to the power ground end, and an output end connected to the control circuit, the control circuit is further connected to the drive circuit, and the drive circuit is further connected to the second end of the power switch; The voltage mutation detection circuit outputs a shutdown signal when a sudden change occurs in the control terminal voltage of the power switch, and the control circuit outputs a cutoff control signal based on the received shutdown signal so that the drive circuit controls the power switch to be turned off; wherein the control terminal voltage is equal to the sum of the gate-source voltage and the source voltage of the power switch.

2. The high-side intelligent electronic switch according to claim 1, characterized in that: The voltage mutation detection circuit is used to obtain the control terminal voltage of the power switch when in operation, and determine whether the control terminal voltage has a mutation according to the voltage change information of the control terminal of the power switch relative to the power ground terminal.

3. The high-side intelligent electronic switch according to claim 2, characterized in that: The voltage mutation detection circuit includes a first enable terminal and a second enable terminal, the first enable terminal is used to access a drive control signal, the drive control signal is a turn-on control signal or a turn-off control signal, the second enable terminal is used to access a protection signal or a non-protection signal, and the control circuit is also used to access one of the protection signal and the non-protection signal and the drive control signal; The voltage mutation detection circuit does not work when it receives a shutdown control signal and / or a protection signal, and works when it receives a start control signal and a non-protection signal at the same time; the control circuit is also used to control the power switch to be shut down via the drive circuit when it receives a shutdown control signal and / or a protection signal.

4. The high-side intelligent electronic switch according to claim 2, characterized in that: The voltage mutation detection circuit includes an enable terminal, and the enable terminal is used to access a protection signal or a non-protection signal; The voltage mutation detection circuit does not work when it receives a protection signal, and works when it receives a non-protection signal.

5. The high-side intelligent electronic switch according to any one of claims 2 to 4, characterized in that: The voltage change information includes the relationship between the time information required for the voltage of the control terminal to drop from the first voltage threshold to the second voltage threshold and the reference time information, wherein the second voltage threshold is less than the first voltage threshold and the second voltage threshold is greater than the maximum voltage value of the control terminal relative to the load output terminal when the power switch is normally turned on; The voltage mutation detection circuit includes a first comparison unit, a second comparison unit, a timing unit and a third comparison unit; the first input end of the first comparison unit and the first input end of the second comparison unit are both connected to the control end of the power switch, the second input end of the first comparison unit is used to access the first voltage threshold, the second input end of the second comparison unit is used to access the second voltage threshold, the output end of the first comparison unit is connected to the timing unit, the output end of the second comparison unit is connected to the enable end of the third comparison unit, the timing unit is also connected to the first input end of the third comparison unit, and the second input end of the third comparison unit is used to access reference time information; The first comparison unit outputs a timing signal when the voltage at the control terminal of the power switch is less than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the second comparison unit outputs an enable signal when the voltage at the control terminal of the power switch is less than or equal to a second voltage threshold, the third comparison unit compares the current timing information of the timing unit with the reference time information when receiving the enable signal, and outputs the shutdown signal when the current timing information is less than or equal to the reference time information.

6. The high-side intelligent electronic switch according to any one of claims 2 to 4, characterized in that: The voltage change information includes a magnitude relationship between a control terminal voltage and a second voltage threshold when a reference time information is passed from a first moment, the first moment is a moment when the control terminal voltage drops to the first voltage threshold, the second voltage threshold is less than the first voltage threshold and the second voltage threshold is greater than a voltage value of the control terminal relative to the load output terminal when the power switch is normally turned on; The voltage mutation detection circuit includes a first comparison unit, a timing unit, a second comparison unit and a third comparison unit; the first input end of the first comparison unit and the first input end of the second comparison unit are both connected to the control end of the power switch, the second input end of the first comparison unit is used to access the first voltage threshold, the second input end of the second comparison unit is used to access the second voltage threshold, the output end of the first comparison unit is connected to the timing unit, the timing unit is also connected to the first input end of the third comparison unit, the second input end of the third comparison unit is used to access the reference time information, and the output end of the third comparison unit is connected to the enable end of the second comparison unit; The first comparison unit outputs a timing signal when the voltage at the control terminal of the power switch is less than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the third comparison unit outputs an enable signal when the real-time timing information reaches the reference time information, the second comparison unit compares the current control terminal voltage of the power switch with the second voltage threshold when receiving the enable signal, and outputs the shutdown signal when the current control terminal voltage is less than or equal to the second voltage threshold.

7. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that: The driving circuit includes a charging unit, a charging switch and a discharging switch; 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, and the control end of the charging switch and the control end of the discharge switch are both connected to the control circuit; When the control circuit outputs the cutoff control signal, the charging switch is turned off, and the discharging switch is turned on to discharge the charge at the control end of the power switch, so that the power switch is turned off.

8. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that: The driving circuit comprises a driving unit and a switching unit; The driving unit and the switch unit are both connected to the control circuit, and are also both connected to the second end of the power switch. The driving unit is used to control the power switch to turn on or off, and the switch unit is used to discharge the charge of the control end of the power switch when it is turned on. The control circuit controls the switch unit to turn on and conduct when receiving the shutdown signal, so as to quickly discharge the charge at the control end of the power switch, so that the power switch is turned off.

9. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that: The control circuit includes a latch unit and a logic control unit; The latch unit has a first input end connected to the output end of the voltage mutation detection circuit, a second input end for receiving a drive control signal, and an output end connected to the logic control unit, wherein the drive control signal is a start control signal or a shutdown control signal; If the latch unit receives the shutdown signal while receiving the opening control signal, it enters a locked state and continuously outputs the first intermediate signal so that the logic control unit continuously outputs the cutoff control signal; if the latch unit receives the shutdown control signal in the locked state, the locked state is released.

10. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that: The control circuit includes a latch unit and a logic control unit; The latch unit has a first input end connected to the output end of the voltage mutation detection circuit, and an output end connected to the logic control unit, and the logic control unit is also used to access the drive control signal; The latch unit enters a locking state and continuously outputs a first intermediate signal upon receiving the shutdown signal, and the logic control unit shields the driving control signal and outputs the cutoff control signal upon receiving the first intermediate signal.

11. The high-side intelligent electronic switch according to claim 10, characterized in that: The high-side intelligent electronic switch further comprises a shutdown detection circuit, wherein the shutdown detection circuit is connected to the second input terminal of the latch unit; The shutdown detection circuit is used to detect whether the power switch is completely shut down, and output an unlock signal when it is determined that the power switch is completely shut down. The latch unit releases the locking state when receiving the unlock signal.

12. The high-side intelligent electronic switch according to claim 11, characterized in that: The high-side intelligent electronic switch also includes a delay circuit; The delay circuit has an input end connected to the output end of the shutdown detection circuit, and an output end connected to the second input end of the latch unit. The delay circuit starts timing when receiving the unlocking signal and when the continuous timing information reaches the preset time information, the delay circuit outputs the delayed unlocking signal. The latch unit releases the locked state when receiving the delayed unlocking signal.

13. An integrated circuit chip, characterized in that: It comprises a high-side intelligent electronic switch as described in any one of claims 1 to 12, 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.

14. A chip product, characterized in that: The high-side intelligent electronic switch according to any one of claims 1 to 12, wherein the components of the high-side 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, 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.

15. A car, characterized in that: Comprising the high-side intelligent electronic switch according to any one of claims 1 to 12, or the integrated circuit chip according to claim 13, or the chip product according to claim 14; 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 high-side intelligent electronic switch.

16. The automobile according to claim 15, 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.

Images