CN117895929A

CN117895929A - Intelligent electronic switch, integrated circuit chip, chip product and electronic equipment

Info

Publication number: CN117895929A
Application number: CN202311867855.XA
Authority: CN
Inventors: 宋朋亮; 白文利; 刘雪
Original assignee: Wuxi Wenxian Microelectronics Co ltd
Current assignee: Wuxi Wenxian Microelectronics Co ltd
Priority date: 2023-12-29
Filing date: 2023-12-29
Publication date: 2024-04-16

Abstract

The application provides an intelligent electronic switch, include: the power switch is used for being connected with a load in series, the control end of the power switch is connected with the switch control unit, the overcurrent detection judging module is used for obtaining sampling current information, the sampling current information is used for representing current flowing through the power switch, the power switch is also used for receiving second reference voltage, when the sampling current information is larger than or equal to the second reference voltage and lasts for a first preset duration, the overcurrent detection judging module outputs an overcurrent signal to the switch control unit, and the switch control unit controls the power switch to be disconnected and cut off; the overcurrent detection judging module is further used for obtaining a first battery signal representing battery voltage, the first preset duration is adjusted according to the first battery signal, and the larger the first battery signal is, the smaller the first preset duration is. The embodiment of the application also provides an integrated circuit chip, a chip product and electronic equipment.

Description

Intelligent electronic switch, integrated circuit chip, chip product and electronic equipment

Technical Field

The present application relates to the field of intelligent semiconductor switches, and more particularly to an intelligent electronic switch, an integrated circuit chip, a chip product, and an electronic device.

Background

In recent years, with the growth of automobile markets, particularly the explosion of electric automobile markets, such as electric passenger car markets and electric business car markets, the demands for automobile electronic components are increasing. The electronic component in the automobile with relatively high demands is a relay for switching on or off a load line. However, the relay itself has some drawbacks such as long on and off delay time, expensive and bulky.

As semiconductor technology has evolved, intelligent electronic switches have been developed to replace traditional relays, which are commonly used to couple loads to batteries, with one or more diagnostic capabilities and protection features, such as protection against over-temperature, overload, and short-circuit events. For example, there is a power switch in the intelligent electronic switch, and the power switch is turned off in case of an over temperature, overload or short circuit, etc., so that the path of the battery to the load is disconnected.

One of the existing intelligent electronic switches is overcurrent protection, for example, overcurrent occurs when a load is short-circuited, and when the intelligent electronic switch detects the overcurrent, the intelligent electronic switch controls the power switch to be turned off so as to protect the power switch or components on a main path where the power switch is located. In order to avoid misjudgment of the overcurrent, for example, some interference signals are misjudged to be the overcurrent, the intelligent electronic switch also judges that the overcurrent exceeds the preset time to control the power switch to be disconnected and cut off, and when the overcurrent is judged to be less than the preset time, the power switch is not controlled to be disconnected and cut off.

Disclosure of Invention

The inventor of the present invention has found through long-term experiments that: the existing intelligent electronic switch judges that the overcurrent parameters and the preset time length are fixed, namely, the overcurrent parameters and the preset time length are fixed regardless of the voltage of a battery connected with the intelligent electronic switch, however, the intelligent electronic switch is wide in application range, the voltage range of the battery connected with the intelligent electronic switch can be 10V-70V, for example, 12V, 24V, 48V, 60V and the like, the battery voltage phase difference is large, when the voltage phase difference of the battery connected with the intelligent electronic switch is large, the heat productivity of the corresponding element of the preset time length is different when the overcurrent occurs, even if the overcurrent rises to a certain degree and is limited, the heat productivity of the battery is large due to the fact that the voltage of the battery is different, the heat productivity of the battery is high, the heat productivity of the preset time length is low, and the heat productivity of the battery is low. The problem that the intelligent electronic switch is connected with a battery with higher voltage and overcurrent protection is not triggered yet when overcurrent occurs, and components are damaged due to larger heating value is likely to occur.

The technical problem to be solved by the embodiment of the application is to provide an intelligent electronic switch, an integrated circuit chip, a chip product and electronic equipment aiming at the defects of the prior art. The probability of damage to the power switch and the like caused by overcurrent can be effectively reduced.

To solve the above technical problem, a first aspect of an embodiment of the present application provides an intelligent electronic switch, including:

the power supply end is used for being connected with the positive electrode of the battery, the power supply end is used for being connected with the negative electrode of the battery, and the load output end is used for being connected with the load;

the power switch and the switch control unit are used for being connected with a load in series, one end of the power switch is connected with a power supply end or a power ground end, the other end of the power switch is connected with a load output end, the control end of the power switch is connected with the switch control unit, and the switch control unit is used for controlling the power switch to be turned on, turned off or turned off;

the overcurrent detection judging module is connected with the switch control unit and is used for obtaining sampling current information, the sampling current information is used for representing current flowing through the power switch and is also used for obtaining second reference voltage, and when the sampling current information is larger than or equal to the second reference voltage and lasts for a first preset duration, the overcurrent detection judging module outputs an overcurrent signal to the switch control unit, and the switch control unit controls the power switch to be disconnected and cut off;

The overcurrent detection judging module is further used for obtaining a first battery signal representing battery voltage, the first preset duration is adjusted according to the first battery signal, and the larger the first battery signal is, the smaller the first preset duration is.

Optionally, the overcurrent detection and judgment module includes a voltage classification unit and a voltage logic control unit, the input end of the voltage classification unit is connected with the first battery information, the output end of the voltage classification unit is connected with the voltage logic control unit, the voltage classification unit presets a plurality of range intervals, the range intervals are different, and the voltage classification unit classifies the first battery information into the corresponding range interval and outputs a corresponding signal to the voltage logic control unit.

Optionally, the overcurrent detection and judgment module includes a delay unit, where the delay unit is connected with the voltage logic control unit, the delay unit is configured to generate a plurality of first preset durations, the number of the first preset durations corresponds to the number of the range intervals, and the delay unit is configured to select the corresponding first preset durations according to signals of the voltage logic control unit.

Optionally, the delay unit includes a reference oscillator, a delay time generating unit, and a time selecting unit, where the delay time generating unit is connected to the reference oscillator and the time selecting unit, the delay time generating unit generates a plurality of first preset time based on the reference oscillator, the time selecting unit includes a plurality of third switches, the number of the third switches corresponds to the number of the range intervals, a first end of each of the plurality of third switches is connected to the delay time generating unit to correspondingly select one of the plurality of first preset time, a second end of the plurality of third switches is connected together, the switch control unit is connected to a second end of the plurality of third switches or is connected to the delay time generating unit, a control end of the plurality of third switches is connected to the voltage logic control unit, and the plurality of third switches are controlled to be turned on or off according to signals of the voltage logic control unit to select the corresponding first preset time.

Optionally, the delay unit is connected with the voltage logic control unit, the delay unit includes a reference capacitor and a plurality of third current sources, and the voltage logic unit selects one or more of the plurality of third current sources to be used for adjusting the current for charging or discharging the reference capacitor so as to adjust a first preset duration, where the first preset duration is a duration required by the reference capacitor to be charged to a preset third reference voltage or a duration required by the reference capacitor to be discharged to the preset third reference voltage; or,

The delay unit is connected with the voltage logic control unit, the delay unit comprises a third current source and a plurality of reference capacitors, the reference capacitors are connected in parallel, the voltage logic unit selects one or more of the reference capacitors to act to adjust capacitance, and then adjusts a first preset duration, the acting reference capacitors are charged or discharged through the third current source, and the first preset duration is the duration required by the selected acting reference capacitors to charge to a preset third reference voltage or the duration required by the selected acting reference capacitors to discharge to the preset third reference voltage.

Optionally, the overcurrent detection and judgment module includes a delay unit, the delay unit adjusts the first preset duration according to the first battery signal, the delay unit includes a voltage-controlled current source and a reference capacitor, where a control end of the voltage-controlled current source is connected to the first battery signal, an output current of the voltage-controlled current source is in direct proportion to the first battery signal, a current output by the voltage-controlled current source is used for charging or discharging the reference capacitor, and the first preset duration is a time required for charging the reference capacitor to a third reference voltage through the voltage-controlled current source, or the first preset duration is a time required for discharging the reference capacitor to the third reference voltage through the voltage-controlled current source.

Optionally, the overcurrent detection and judgment module includes a battery voltage sampling unit, where the battery voltage sampling unit is used to be connected with an anode of a battery, the battery voltage sampling unit is further used to be connected with a power supply ground terminal, and the battery voltage sampling unit is used to convert a battery voltage into first battery information, and the first battery information is smaller than the battery voltage.

Optionally, the overcurrent detection and judgment module further includes a current sampling unit, where the current sampling unit is configured to convert a current flowing through the power switch into sampled current information, and the sampled current information is a voltage.

Optionally, the over-current detection and judgment module further includes an over-current voltage comparator and a delay unit, the first end of the over-current voltage comparator is connected with sampling current information, the second end of the over-current voltage comparator is connected with a second reference voltage, the output end of the over-current voltage comparator is connected with the delay unit, the delay unit is further connected with the switch control unit, the delay unit is used for adjusting the first preset time length according to the first battery signal, when the voltage of the first end of the over-current voltage comparator is greater than or equal to the voltage of the second end, the delay unit counts the duration of the second signal, when the counted duration of the delay unit reaches the first preset time length, the over-current signal is output to the switch control unit, and the switch control unit controls the power switch to be turned off.

Optionally, the over-current detection and judgment module further includes a second reference voltage generation adjustment unit, where the second reference voltage generation adjustment unit is connected to the second end of the over-current voltage comparator, and the second reference voltage generation adjustment unit is configured to adjust the second reference voltage according to the first battery signal, and the larger the first battery signal, the smaller the second reference voltage.

The second aspect of the embodiment of the application provides an integrated circuit chip, which comprises the intelligent electronic switch, 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.

A third aspect of the embodiments of the present application provides a chip product, including the above-mentioned intelligent electronic switch, where elements of the intelligent electronic switch other than a power switch are located on a first integrated circuit chip, and the power switch is located on a second integrated circuit chip;

the power supply end is a power supply pin, the power supply grounding end is a power supply grounding pin, the load output end is a load output pin, the power supply pin and the power supply grounding pin are located on a first integrated circuit chip, and the load output pin is located on a second integrated circuit chip.

A fourth aspect of the present application provides an electronic device, including the above-mentioned intelligent electronic switch or the above-mentioned integrated circuit chip or the above-mentioned chip product;

the intelligent electronic switch further comprises a battery, a load and a microprocessor, wherein the positive electrode of the battery is connected with a power supply end of the power supply, the negative electrode of the battery is connected with a power supply grounding end, one end of the load is connected with a load output end, the other end of the load is connected with the power supply grounding end or the power supply end, and the microprocessor is connected with the intelligent electronic switch.

Optionally, the electronic device comprises an automobile.

According to the embodiment, different battery voltages correspond to different first preset durations, the first preset durations are smaller, the battery voltages are larger, and the first preset durations are larger, so that when the battery voltages are larger, the first preset durations are correspondingly smaller, and after overcurrent is found, the delay durations of the overcurrent are relatively shorter, the power switch is turned off and turned off by relatively earlier control, the heating durations of the power switch or the electronic element on the main path are relatively shorter before the power switch is turned off, and therefore the heating value is smaller, the heating value can be effectively controlled, and the problems that the higher the battery voltage is, the larger the heating value is, and the electronic element on the power switch or the main path is easy to damage are solved. And false triggering is not easy to be caused due to the existence of the first preset time length.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1a is a circuit block diagram of an electronic device according to a first embodiment of the present application;

FIG. 1b is a circuit block diagram of an electronic device according to another embodiment of the present application;

fig. 2 is a circuit block diagram of the overcurrent detection and judgment module, which is connected with the switch control unit and the first current sampling resistor according to the first embodiment of the present application;

FIG. 3 is a circuit block diagram of an overcurrent detection and judgment module according to another embodiment of the present application, connected to a switch control unit and a first current sampling resistor;

FIG. 4 is a circuit block diagram of an intelligent electronic switch according to yet another embodiment of the present application;

FIG. 5 is a circuit block diagram of the overcurrent detection and judgment module, the switch control unit and the first current sampling resistor according to the second embodiment of the present application;

FIG. 6 is a circuit block diagram of an overcurrent detection and judgment module according to another embodiment of the present application, connected to a switch control unit and a first current sampling resistor;

FIG. 7 is a circuit block diagram of an overcurrent detection and judgment module according to another embodiment of the present application, connected to a switch control unit and a first current sampling resistor;

FIG. 8 is a circuit block diagram of an overcurrent detection and judgment module according to another embodiment of the present application, connected to a switch control unit and a first current sampling resistor;

fig. 9a is a circuit block diagram of the connection between the overcurrent detection and judgment module and the switch control unit, the first current sampling resistor according to the third embodiment of the present application;

FIG. 9b is a circuit block diagram of an overcurrent detection and determination module according to another embodiment of the present application connected to a switch control unit and a first current sampling resistor;

fig. 10 is a circuit block diagram of the overcurrent detection and judgment module according to the fourth embodiment of the present application, which is connected to the switch control unit and the first current sampling resistor.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The terms "comprising" and "having" and any variations thereof, as used in the specification, claims and drawings, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or units listed but may alternatively include other steps or units not listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order. The connection of the present application includes direct connection and indirect connection, which means that other electronic components, pins, etc. may also exist between the two components connected. The XX pin referred to in this application may or may not be an actually present pin, for example, merely a pin of a component or a pin of a wire. The present application refers to and/or includes three cases, e.g., a and/or B, including those of A, B, A and B.

First embodiment

The embodiment of the application provides electronic equipment, such as an automobile. Referring to fig. 1a, the electronic device includes a battery 110, a load 120, a microprocessor, and an intelligent electronic switch. The battery 110 is typically a storage battery, and the storage battery provides voltages of 12V, 24V, 48V, 60V, etc., but other types of batteries are also possible. The load 120 includes at least one of a resistive load, such as a seat adjustment device, an auxiliary heating device, a window heating device, a Light Emitting Diode (LED), a rear lighting or other resistive load, an inductive load, such as a pump, actuator, motor, anti-lock brake system (ABS), electronic Brake System (EBS), fan or other system including an inductive load, such as a lighting element, such as a xenon arc lamp, for one or more wiper systems. The microcontroller is connected with the intelligent electronic switch and is used for controlling the intelligent electronic switch, and meanwhile, the intelligent electronic switch feeds back the state and related parameter information, such as related parameter information of diagnosis and protection, to the microprocessor for processing by the microprocessor.

In this embodiment, the intelligent electronic switch includes a power supply end VCC, a power ground end GND, and a load output end OUT, where the power supply end VCC is connected with the positive electrode of the battery 110, the power ground end GND is connected with the negative electrode of the battery 110, in this embodiment, the power ground end GND is connected with the negative electrode of the battery 110, in addition, in other embodiments of the present application, a reverse connection preventing diode and a current limiting resistor connected in parallel are further disposed between the power ground end GND and the negative electrode of the battery 110, the load output end OUT is connected with one end of the load 120, and the other end of the load 120 is connected with the negative electrode of the battery 110.

In this embodiment, the intelligent electronic switch further includes a power switch 130 and a switch control unit 140, wherein one end of the power switch 130 is connected in series with the load 120 via the load output terminal OUT, the other end of the power switch is connected with the power supply terminal VCC, the control terminal of the power switch is connected with the switch control unit 140, and the switch control unit 140 is used for controlling whether the power switch 130 is turned on or not. In the present embodiment, the power switch 130 is an NMOS transistor, a PMOS transistor, a junction FET, an IGBT, or the like, and the NMOS transistor is illustrated as an example, and the power switch 130 may be implemented as a silicon device, or may be implemented using other semiconductor materials, such as silicon carbide (SiC), gallium arsenide (GaAs), gallium nitride (GaN), or the like. In this embodiment, the microcontroller outputs a first control signal to the intelligent electronic switch, the switch control unit 140 controls the power switch 130 to be turned on and turned off, and the microcontroller outputs a second control signal to the intelligent electronic switch, and the switch control unit 140 controls the power switch 130 to be turned off and turned on.

In fig. 1a, the power switch 130 is connected as a high-side switch, which is a switch connected between the power supply terminal VCC and the load 120. However, the present application is not limited thereto, and in other embodiments of the present application, referring to fig. 1b, the power switch 130 is connected as a low-side switch, which is connected between the load 120 and the power ground GND.

In order to prevent the power switch 130 or components on the main path (for example, the first current sampling resistor Ri1 mentioned later) from being damaged due to heat when the battery voltage is high, please refer to fig. 1a and 2 in combination, in this embodiment, the intelligent electronic switch further includes an over-current detection and judgment module 200, the over-current detection and judgment module 200 is configured to obtain sampling current information indicating a current flowing through the power switch 130, the sampling current information is for example, a voltage, the over-current detection and judgment module 200 is further configured to obtain a preset second reference voltage Vref2, and when the sampling current information is greater than or equal to the second reference voltage Vref2 and lasts for a preset first preset duration, the over-current detection and judgment module 200 outputs an over-current signal to the switch control unit 140, and the switch control unit 140 is configured to control the power switch 130 to turn off. In this embodiment, the over-current detection and judgment module 200 is further configured to obtain a first battery signal representing a battery voltage, where the first battery signal may be equal to or smaller than the battery voltage, for example, the first battery signal may be obtained by voltage division, where the first battery signal is in direct proportion to the battery voltage, where the over-current detection and judgment module 200 adjusts the first preset time period according to the first battery signal, that is, the first preset time period is not unique in this embodiment, but adjusts according to the first battery signal, and the greater the first battery signal, the smaller the first preset time period, for example, the first battery signal is 3V when the battery voltage is 12V, the corresponding first preset time period is 6ms, the first battery signal is 9V when the battery voltage is 36V, the corresponding first preset time period is 1.95ms, the first battery signal is 12V when the battery voltage is 48V, the corresponding first preset time period is 1.4ms, and the first battery signal is 18 when the battery voltage is 72V, the corresponding first preset time period is 0.9ms. Preferably, as the battery voltage increases, the slope of the change of the first preset duration becomes steeper, so that the damage caused by the short-time abrupt change of the current due to the larger battery voltage can be counteracted.

According to the embodiment, different battery voltages correspond to different first preset durations, the first preset durations are smaller, the battery voltages are larger, and the first preset durations are larger, so that when the battery voltages are larger, the first preset durations are correspondingly smaller, and therefore, after overcurrent occurs, the delay durations of the overcurrent are relatively shorter, the power switch 130 is turned off by relatively earlier control, the heating durations of the power switch 130 or electronic elements on a main path are relatively shorter before the power switch is turned off, the heating value is smaller, the heating value can be effectively controlled, and the problems that the battery voltages are higher, the heating value is larger, and the electronic elements on the power switch or the main path are easy to damage are avoided. And false triggering is not easy to be caused due to the existence of the first preset time length.

With continued reference to fig. 1a and fig. 2, in this embodiment, the electronic device further includes a first current sampling resistor Ri1, where the first current sampling resistor Ri1 has higher precision, and can realize current sampling in the main path, and a first end of the first current sampling resistor Ri1 is connected to the positive electrode of the battery 110, and a second end is connected to the power supply end VCC or one end of the load 120. In addition, in other embodiments of the present application, referring to fig. 1b, a first terminal of the first current sampling resistor Ri1 is connected to the negative electrode of the battery 110, and a second terminal is connected to the power ground GND or one terminal of the load 120.

Referring to fig. 1a and fig. 2, in this embodiment, the over-current detection and judgment module 200 includes a battery voltage sampling unit 250, where one end of the battery voltage sampling unit 250 is connected to the positive electrode of the battery 110 via a first battery terminal vbat+, the other end of the battery voltage sampling unit 250 is connected to the power ground GND, the battery voltage sampling unit 250 includes, for example, 2 voltage dividing resistors connected in series, and outputs a first battery signal at the point where the first sampling resistor Rc1 and the second sampling resistor Rc2 are connected, for example, the first battery signal is 1/2, 1/3, 1/4,/1/5, 1/10, etc. of the battery voltage, and in other embodiments of the present application, the battery voltage sampling unit 250 may not be provided, where the first battery signal is equal to the battery voltage, and the voltage of the first battery terminal vbat+ is the first battery signal. In addition, in other embodiments of the present application, the battery voltage sampling unit 250 may further include a plurality of voltage dividing resistors connected in series, which is a conventional technology in the art and will not be described herein. In addition, in other embodiments of the present application, the first battery terminal vbat+ and the power supply terminal VCC may also be the same terminal.

In this embodiment, the overcurrent detection and judgment module 200 further includes a voltage classification unit 260, where the voltage classification unit 260 is configured to learn, according to the received first battery signal, a range in which the battery voltage is located, for example, the voltage classification unit 260 divides the first battery signal into a plurality of interval ranges, and in this embodiment, sets 4 interval ranges, which are respectively: the battery signal processing circuit is smaller than a preset first reference voltage Vref11, is larger than or equal to the first reference voltage Vref11 and smaller than a preset first second reference voltage Vref12, is larger than or equal to the first second reference voltage Vref12 and smaller than a preset first third reference voltage Vref13, and is larger than or equal to the first third reference voltage Vref13, wherein the first reference voltage Vref11 is smaller than the first second reference voltage Vref12, the first second reference voltage Vref12 is smaller than the first third reference voltage Vref13, and the range of the first battery signal is obtained by comparing the first battery signal with the first reference voltage Vref11, the first second reference voltage Vref12 and the first third reference voltage Vref13 and outputting corresponding signals. In addition, in other embodiments of the present application, more range sections or fewer range sections may be set as desired, for example, 2, 3, 5, 6, 10, 20, 50, 100 range sections are set.

In this embodiment, the voltage grading unit 260 includes a first one-to-one voltage comparator LM11, a first two-voltage comparator LM12, and a first three-voltage comparator LM13, where a first input end of the first one-to-one voltage comparator LM11, a first input end of the first two-voltage comparator LM12, and a first input end of the first three-voltage comparator LM13 are all connected to a first battery signal, that is, are all connected to points where the first sampling resistor Rc1 and the second sampling resistor Rc2 are connected, a second input end of the first one-to-one voltage comparator LM11 is connected to a preset first one-to-reference voltage Vref11, a second input end of the first two-voltage comparator LM12 is connected to a preset first two-reference voltage Vref12, and a second input end of the first three-voltage comparator LM13 is connected to a preset first three-reference voltage Vref13. When the first battery signal is smaller than the first one-to-one reference voltage Vref11, the first one-to-one voltage comparator LM11 outputs a first one-to-one signal, when the first battery signal is larger than or equal to the first one-to-one reference voltage Vref11, the first one-to-one voltage comparator LM11 outputs a first two signal, when the first battery signal is smaller than the first two-to-two reference voltage Vref12, the first two-voltage comparator LM12 outputs a first four signal, when the first battery signal is larger than or equal to the first two-to-two reference voltage Vref12, the first three-voltage comparator LM13 outputs a first five signal, when the first battery signal is larger than or equal to the first three-to-reference voltage Vref13, the first three-voltage comparator LM13 outputs a first six signal, wherein the first one-to-one signal, the first three signal and the first five signal may be the same or different, may be set according to actual needs, the first two signals and the first two signals may be the same, or different may be set according to actual needs, and may be the same, or different, may be set in the embodiment, according to the actual needs. In this embodiment, the first one-to-one signal, the first third signal, the first fifth signal are high, the first two-signal, the first four signal, the first six signal are low, or vice versa. In addition, in other embodiments of the present application, the second input terminal of the first one-to-one voltage comparator LM11, the second input terminal of the first two-voltage comparator LM12, and the second input terminal of the first third voltage comparator LM13 may be connected to the first battery signal, which is not particularly limited. In this embodiment, the first input terminal is a reverse terminal, and the second input terminal is a same-direction terminal.

In this embodiment, the overcurrent detection and judgment module 200 further includes a voltage logic control unit 220, where the voltage logic unit is connected to the voltage classification unit 260, and the specific voltage logic control unit 220 is respectively connected to the output end of the first one-to-one voltage comparator LM11, the output end of the first two-voltage comparator LM12, and the output end of the first three-voltage comparator LM13, where the voltage logic control unit 220 learns the interval range where the first battery signal is located according to the signal output by the first one-to-one voltage comparator LM11, the signal output by the first two-voltage comparator LM12, and the signal output by the first three-voltage comparator LM13, and outputs a corresponding signal. In addition, in other embodiments of the present application, the first battery signal may be converted into a digital signal by an analog-to-digital converter, and then classified, and after the classification is completed, the first battery signal is converted into an analog signal by a digital-to-analog converter and output to the voltage logic control unit, and the analog signal is converted into a digital signal, so that classification processing and calculation are facilitated.

In this embodiment, the first current sampling resistor Ri1 is an accurate sampling resistor, and the first current sampling resistor Ri1 is used for sampling the current in a main path, where the main path in this application refers to a path where the positive electrode of the battery 110, the power switch 130, the load 120, and the negative electrode of the battery 110 are located. In this embodiment, a first end of the first current sampling resistor Ri1 is connected to the positive electrode of the battery 110, a second end of the first current sampling resistor Ri1 is connected to the power supply end VCC (fig. 1 a) or one end of the load 120, and when the power switch 130 is turned on, the voltage on the first current sampling resistor Ri1 can reflect the current in the main path. In addition, in other embodiments of the present application, a first terminal of the first current sampling resistor Ri1 is connected to the negative electrode of the battery 110, and a second terminal of the first current sampling resistor Ri1 is connected to one terminal of the load 120 or one terminal of the power switch 130 (fig. 1 b).

In this embodiment, the overcurrent detection and judgment module 200 further includes a current sampling unit 210, where the current sampling unit 210 is configured to obtain the current flowing through the power switch 130. In this embodiment, the current sampling unit 210 includes a differential amplifying unit 211, a first end of the differential amplifying unit 211 is connected to a first end of the first current sampling resistor Ri1 via a first battery end vbat+, a second end of the differential amplifying unit 211 is connected to a second end of the first current sampling resistor Ri1 via a power supply end VCC, and the differential amplifying unit 211 performs a difference operation on a voltage at the first end and a voltage at the second end of the current sampling unit 210 to obtain sampling current information, where the sampling current information is proportional to a current flowing through the first current sampling resistor Ri1, that is, proportional to a current flowing through the power switch 130. In addition, in other embodiments of the present application, the first end of the differential amplifying unit 211 is connected to the first end of the first current sampling resistor Ri1 via the second battery end VBAT-, and the second end of the differential amplifying unit 211 is connected to the second end of the first current sampling resistor Ri1 via the power ground end GND, where the differential amplifying unit 211 performs a difference operation on the voltage of the first end and the voltage of the second end of the current sampling unit 210 to obtain the sampled current information. In addition, in other embodiments of the present application, the second battery terminal VBAT-and the power ground terminal GND may be the same terminal when there is no first current sampling resistor Ri1 therebetween.

In this embodiment, the overcurrent detection and judgment module 200 further includes an overcurrent voltage comparator LMC, a first end of the overcurrent voltage comparator LMC is connected to the output end of the differential amplifying unit 211, a second end of the overcurrent voltage comparator LMC is connected to a preset second reference voltage Vref2, the second reference voltage Vref2 is an overcurrent protection threshold, and the overcurrent voltage comparator LMC outputs according to the comparison result.

In this embodiment, the overcurrent detection and judgment module 200 further includes a delay unit 240, the delay unit 240 is connected to the output end of the overcurrent voltage comparator LMC, and the output end of the delay unit 240 is connected to the switch control unit 140. In this embodiment, when the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the voltage at the second end thereof, the over-current voltage comparator LMC outputs a second signal, the delay unit 240 starts to count time, when the duration of the second signal is greater than or equal to the preset first preset duration, the delay unit 240 outputs the over-current signal to the switch control unit 140, the switch control unit 140 controls the power switch 130 to be turned off, and when the voltage at the first end of the over-current voltage comparator LMC is less than the voltage at the second end thereof, the over-current voltage comparator LMC outputs the second signal, and the power switch 130 maintains the original state. In this embodiment, by setting the delay unit 240, the overcurrent signal is output only if the duration of the overcurrent is greater than or equal to the first preset duration, which is favorable for preventing the false detection of the interference signal and improving the reliability. In this embodiment, the second signal is, for example, high, and the second signal is, for example, low, or vice versa. In this embodiment, the first preset duration is adjustable, and the first preset duration varies with the change of the battery voltage and is inversely proportional, that is, the higher the battery voltage is, the shorter the first preset duration is, the lower the battery voltage is, and the longer the first preset duration is.

Specifically, referring to fig. 2, in this embodiment, the delay unit 240 includes a reference oscillator 241, a delay time generating unit 242, and a time length selecting unit (not labeled in the figure), where the reference oscillator 241 is used to generate a reference frequency, a period of the reference frequency is fixed, the delay time generating unit 242 is connected to the reference oscillator 241, and the delay time generating unit 242 is used to divide the frequency of the reference oscillator 241 to generate a plurality of delay time lengths, corresponding to a plurality of first preset time lengths, and in this embodiment, generate 4 delay time lengths, corresponding to 4 first preset time lengths, where the 4 first preset time lengths are a first one-to-one preset time length, a first two preset time length, a first three preset time length, and a first four preset time length, and the 4 first preset time lengths respectively correspond to 4 delay time lengths, that is, the delay time length generating unit 242 generates a first one-to-one preset time length, a first two preset time length, a first three preset time length, and a first four preset time length, where the first one-to-one preset time length < first two preset time lengths < first preset time lengths. In this embodiment, the duration selection unit is configured to select a corresponding delay duration according to the first battery signal, where the duration selection unit is located between the delay duration generation unit 242 and the switch control unit 140.

In this embodiment, the duration selection unit includes a plurality of third switches, where the number of the third switches corresponds to the number of the first preset durations, and is 4 in this embodiment, and the third switches are respectively a third first switch K31, a third second switch K32, a third switch K33, and a third fourth switch K34, where a first end of the third first switch K31 is connected to the delay duration generation unit 242, so as to select the first preset duration, a second end of the third switch K31 is connected to the switch control unit 140, and a control end of the third switch K31 is connected to the voltage logic control unit 220; the first end of the third switch K32 is connected to the delay time generating unit 242, so as to select the first two preset time periods, the second end of the third switch K32 is connected to the switch control unit 140, and the control end of the third switch K32 is connected to the voltage logic control unit 220; the first end of the third switch K33 is connected to the delay time generating unit 242, so as to select a first preset time period, the second end of the third switch K33 is connected to the switch control unit 140, and the control end of the third switch K is connected to the voltage logic control unit 220; the first end of the third fourth switch K34 is connected to the delay time generating unit 242 for selecting the first fourth preset time, the second end thereof is connected to the switch control unit 140, and the control end thereof is connected to the voltage logic control unit 220. In this embodiment, the second end of the third first switch K31, the second end of the third second switch K32, the second end of the third switch K33, and the second end of the third fourth switch K34 are all connected together, and the first end of the third first switch K31, the first end of the third second switch K32, the first end of the third switch K33, and the first end of the third fourth switch K34 are respectively connected to the delay time length generating unit 242. In this embodiment, the third first switch K31, the third second switch K32, the third switch K33, and the third fourth switch K34 include an NMOS transistor, a PMOS transistor, a triode, a field effect transistor, or a transmission gate.

In this embodiment, when the first battery signal is smaller than the first one-to-one reference voltage Vref11, the first one-to-one voltage comparator LM11 outputs a first one-to-one signal, the first two-voltage comparator LM12 outputs a first three-signal, the first three-voltage comparator LM13 outputs a first five-signal, the voltage logic control unit 220 controls the third fourth switch K34 to be turned on, the third first switch K31-third switch K33 to be turned off, and the duration selection unit selects the first fourth preset duration to be active. Specifically, when the voltage at the first end of the over-current voltage comparator LMC is changed from being smaller than the second reference voltage Vref2 to being greater than or equal to the second reference voltage Vref2, the delay time generating unit 242 is triggered to start timing, at this time, the first one-to-one preset time length, the first two preset time lengths, the first three preset time lengths and the first four preset time lengths are all triggered to time, when the duration of the voltage greater than or equal to the second reference voltage Vref2 reaches the first four preset time length, the first one-to-one preset time length, the first two preset time lengths and the first three preset time lengths have been reached at this time, the delay time length generating unit 242 generates 4 over-current signals successively, but since only the third four switch K34 is turned on, the other switches are turned off, so that only the over-current signals sent out by the corresponding first four preset time lengths are transmitted to the switch control unit 140, and thereafter, the timings of the first one-to-two preset time lengths, the first three preset time lengths and the first four preset time lengths are reset; when the voltage of the first end of the intermediate over-current voltage comparator LMC is smaller than the second reference voltage Vref2, the timing of the first one-to-one preset time length, the first two preset time lengths, the first third preset time length and the first four preset time lengths is reset and cleared.

When the first battery signal is greater than or equal to the first one-to-one reference voltage Vref11 and less than the first two-to-one reference voltage Vref12, the first one-to-one voltage comparator LM11 outputs a first two-to-two signal, the first two-to-two voltage comparator LM12 outputs a first three-signal, the first three-voltage comparator LM13 outputs a first five-signal, the voltage logic control unit 220 controls the third switch K33 to be turned on, the third switch K31, the third second switch K32, and the third fourth switch K34 to be turned off, and the duration selection unit selects the first preset duration to be active. Specifically, when the voltage at the first end of the over-current voltage comparator LMC is changed from being smaller than the second reference voltage Vref2 to being greater than or equal to the second reference voltage Vref2, the delay time generating unit 242 is triggered to start timing, at this time, the first one-to-one preset time length, the first two preset time lengths, the first three preset time lengths and the first four preset time lengths are all triggered to time, when the duration of the voltage greater than or equal to the second reference voltage Vref2 reaches the first three preset time length, the first one-to-one preset time length and the first two preset time lengths have been reached at this time, the first four preset time lengths have not been reached, the delay time length generating unit 242 generates 3 over-current signals in a corresponding order, but since only the third switch K33 is turned on, the other switches are turned off, so that only the over-current signals sent by the corresponding first three preset time lengths are transmitted to the switch control unit 140, and thereafter the timings of the first one-to two preset time lengths, the first three preset time lengths and the first four preset time lengths are reset; when the voltage of the first end of the intermediate over-current voltage comparator LMC is smaller than the second reference voltage Vref2, the timing of the first one-to-one preset time length, the first two preset time lengths, the first third preset time length and the first four preset time lengths is reset and cleared.

When the first battery signal is greater than or equal to the first second reference voltage Vref12 and less than the first third reference voltage Vref13, the first one-to-one voltage comparator LM11 outputs a first second signal, the first two-voltage comparator LM12 outputs a first fourth signal, the first three-voltage comparator LM13 outputs a first fifth signal, the voltage logic control unit 220 controls the third second switch K32 to be turned on, the third first switch K31, the third switch K33, and the third fourth switch K34 to be turned off, and the duration selection unit selects the first two preset durations and functions. Specifically, when the voltage at the first end of the over-current voltage comparator LMC is changed from being smaller than the second reference voltage Vref2 to being greater than or equal to the second reference voltage Vref2, the delay time generating unit 242 is triggered to start timing, at this time, the first one-to-one preset time length, the first two preset time lengths, the first three preset time length and the first four preset time lengths are all triggered to time, when the duration of the voltage greater than or equal to the second reference voltage Vref2 reaches the first two preset time lengths, the first three preset time lengths and the first four preset time lengths have reached the first one-to-one preset time length, the delay time length generating unit 242 sequentially generates 2 over-current signals, but since only the third switch K32 is turned on, the other switches are turned off, only the sent over-current signals corresponding to the first two preset time lengths are transmitted to the switch control unit 140, and thereafter the timings of the first one-to-two preset time lengths, the first three preset time lengths and the first four preset time lengths are reset; when the voltage of the first end of the intermediate over-current voltage comparator LMC is smaller than the second reference voltage Vref2, the timing of the first one-to-one preset time length, the first two preset time lengths, the first third preset time length and the first four preset time lengths is reset and cleared.

When the first battery signal is greater than or equal to the first reference voltage Vref13, the first one-to-one voltage comparator LM11 outputs a first two-signal, the first two-voltage comparator LM12 outputs a first four-signal, the first three-voltage comparator LM13 outputs a first six-signal, the voltage logic control unit 220 controls the third switch K31 to be turned on, the third switch K32 to the third four-switch K34 to be turned off, and the duration selection unit selects the first preset duration to be active. Specifically, when the voltage at the first end of the over-current voltage comparator LMC is changed from being smaller than the second reference voltage Vref2 to being greater than or equal to the second reference voltage Vref2, the delay time generating unit 242 is triggered to start timing, at this time, the first one-to-one preset time length, the first two-to-two preset time length, the first three-to-one preset time length, and the first four-to-one preset time length are all triggered to be timed, when the time length that is greater than or equal to the duration of the second reference voltage Vref2 reaches the first one-to-one preset time length, at this time, the first two-to-one preset time length, the first three-to-one preset time length, the first four-to-one preset time length are not reached, the delay time length generating unit 242 generates 1 over-current signal, the over-current signal sent out corresponding to the first one-to-one preset time length is transmitted to the switch control unit 140, and thereafter the timing of the first one-to-two preset time length, the first three preset time length, and the first four preset time length is reset to be cleared; when the voltage of the first end of the intermediate over-current voltage comparator LMC is smaller than the second reference voltage Vref2, the timing of the first one-to-one preset time length, the first two preset time lengths, the first third preset time length and the first four preset time lengths is reset and cleared.

In addition, in other embodiments of the present application, please refer to fig. 3, the duration selection unit is located between the delay duration generation unit 242 and the over-current voltage comparator LMC, and specific connection relationships and principles are referred to fig. 3 and the foregoing description. Here, when the voltage at the first end of the over-current voltage comparator LMC is changed from being smaller than the second reference voltage Vref2 to being greater than or equal to the second reference voltage Vref2, since the voltage logic control unit 220 controls one of the third first switch K31 to the third fourth switch K34 to be turned on, only the first preset time period corresponding to the on-state of the switch will be triggered to start timing, and the other will not be triggered to start timing, and the over-current signal is output to the switch control unit 140 by reaching the corresponding first preset time period delay time period generating unit 242.

In addition, in other embodiments of the present application, the detection of the current flowing through the power switch 130 may be implemented in other manners, please refer to fig. 4, where the current sampling unit 210 includes a mirror tube 212 and a second current sampling resistor Ri2, the number of the mirror tubes 212 is set as required, one mirror tube is set here, and a plurality of mirror tubes may be set as required (for example, the scheme of fig. 1b may refer to CN202221764468.4 current sampling mode), where the mirror tube 212 and the power switch 130 are in a mirror relationship, a control end of the mirror tube 212 is connected to a control end of the power switch 130, one end of the mirror tube 212 is connected to an end of the power switch 130, which is not connected to the load 120, the other end of the mirror tube 212 is connected to a first end of the second current sampling resistor Ri2, a second end of the second current sampling resistor Ri2 is connected to the power ground GND, and one end of the mirror tube 212 connected to the second current sampling resistor Ri2 is used for outputting sampling current information, and the sampling current information is proportional to the current flowing through the power switch 130. The main current is sampled by combining the mirror tube 212 with the second current sampling resistor Ri2, so that the accurate first current sampling resistor Ri1 is not required to be independently arranged, the cost is reduced, the mirror tube 212, the second current sampling resistor Ri2, the power switch 130 and the like can be arranged on the same chip, the design consistency is facilitated, the manufacturing is convenient, and the number of peripheral devices is small.

In this embodiment, when the delay unit 240 outputs the overcurrent signal, the switch control unit 140 controls the power switch 130 to be turned off, when the microcontroller changes from outputting the first control signal to outputting the second control signal, the switch control unit 140 controls the power switch 130 to be turned off, or when the microcontroller changes from outputting the second control signal to outputting the first control signal, the switch control unit 140 controls the power switch 130 to be turned off. Thereafter, the switch control unit 140 may normally control the power switch 130.

The embodiment of the application also provides an integrated circuit chip, which comprises the intelligent electronic switch, namely the intelligent electronic switch is arranged on the same semiconductor substrate. The power supply end VCC is a power supply pin, the power ground end GND is a power ground pin, and the load output end OUT is a load output pin.

Other embodiments of the present application also provide a chip product, where the chip product includes the above-mentioned intelligent electronic switch, and elements of the intelligent electronic switch other than the power switch 130 are located on a first integrated circuit chip, and the power switch 130 is located on a second integrated circuit chip, that is, the first integrated circuit chip is formed on one semiconductor substrate, and the second integrated circuit chip is formed on another semiconductor substrate. The power supply end VCC is a power supply pin, the power ground end GND is a power ground pin, the load output end OUT is a load 120 output pin, the power supply pin and the power ground pin are located on the first integrated circuit chip, and the load 120 output pin is located on the second integrated circuit chip. The first integrated circuit chip and the second integrated circuit chip can be additionally provided with other pins according to the requirement. Here, the first integrated circuit chip and the second integrated circuit chip are packaged into one product.

In addition, in other embodiments of the present application, the intelligent electronic switch, the integrated circuit chip, and the chip product of the present embodiment are not limited to be used in automobiles, but may also be used in fields of industrial automation, aerospace, and the like.

Second embodiment

Referring to fig. 5, fig. 5 is a circuit block diagram of the overcurrent detection and judgment module connected to the switch control unit and the first current sampling resistor according to the second embodiment of the present application, and the present embodiment is similar to the first embodiment, so that a part not described in the present embodiment may refer to the first embodiment, and the main difference between the present embodiment and the first embodiment is that a reference oscillator is not required.

In general, the reference oscillator has a relatively high cost, for reducing the cost, please refer to fig. 1 and 5 in combination, in this embodiment, the delay unit 240 includes a time adjustment unit (not shown), a first switch K41, a second switch K42, a reference capacitor Cb, and a time voltage comparator LMT, the time adjustment unit includes a plurality of third current sources IS3, and a plurality of third switches, in this embodiment, the time adjustment unit IS used for adjusting the magnitude of the discharge current, and further adjusting the first preset time period, wherein the number of the third current sources IS3 IS equal to the number of the third switches, in this embodiment, the number of the third current sources IS3 IS equal to the number of the third switches, in the embodiment, the number of the third current sources IS3 corresponds to a third current source IS31, a third current source IS32, a third current source IS33, a third current source IS34, and the number of the third current sources IS3 corresponds to a third switch K31, a third switch K32, a third switch K33, a third switch K34, a third current generated by the third current source IS31 > third current source IS generated by the third switch K32, and a third current source IS formed by the third switch K32 IS connected in series with the third branch of the third current source IS formed by the third switch IS32, and the third current IS connected in series with the third branch IS formed by the third switch IS32, and the third switch IS connected in series with the third switch IS34, and the third switch IS formed by the third switch IS34, and the third switch IS connected with the third switch IS formed by the third switch IS connected with the third switch IS3 IS corresponds to the third switch IS3, the reference capacitor Cb is commonly connected to the second end of the reference capacitor Cb, the second end of the reference capacitor Cb is connected to the power ground GND, the first end of the reference capacitor Cb is further connected to the second end of the first switch K41, the first end of the first switch K41 is connected to a preset reference voltage VDD, for example, a fixed voltage of 5V, 4V, etc., and the preset reference voltage VDD is generated, for example, by a low dropout linear regulator (low dropout regulator, LDO) or other module capable of generating a stable voltage. The first end of the reference capacitor Cb is further connected to the first end of the time-voltage comparator LMT, the second end of the time-voltage comparator LMT is connected to a preset third reference voltage Vref3, the third reference voltage Vref3 is smaller than the preset reference voltage VDD, and the output end of the time-voltage comparator LMT is connected to the switch control unit 140. In this embodiment, the control terminal of the third first switch K31, the control terminal of the third second switch K32, the control terminal of the third switch K33, and the control terminal of the third fourth switch K34 are respectively connected to the voltage logic control unit 220 for controlling the discharge current. The control end of the first switch K41 and the control end of the second switch K42 are both connected with the output end of the over-current voltage comparator LMC. In this embodiment, the third first switch K31, the third second switch K32, the third switch K33, the third fourth switch K34, the first switch K41, and the second switch K42 include NMOS transistors, PMOS transistors, triodes, field effect transistors, or transmission gates, and may be selected by those skilled in the art according to actual needs.

In this embodiment, when the intelligent electronic switch works normally, the voltage at the first end of the over-current voltage comparator LMC is smaller than the second reference voltage Vref2, the over-current voltage comparator LMC outputs a second signal, the first switch K41 is controlled to be turned on (default state), the second switch K42 is controlled to be turned off and turned off, the reference capacitor Cb is instantly charged to the preset reference voltage VDD, the voltage at the first end of the time-voltage comparator LMT is greater than the voltage at the second end of the time-voltage comparator LMT, and the time-voltage comparator LMT outputs a third signal; when the voltage at the first end of the over-current voltage comparator LMC IS greater than or equal to the second reference voltage Vref2 due to the occurrence of over-current, the over-current voltage comparator LMC outputs a second signal, the second switch K42 IS turned on, the first switch K41 IS turned off, the reference capacitor Cb IS discharged through the third current source IS3, and when the voltage of the reference capacitor Cb drops from the preset reference voltage VDD to be less than or equal to the third reference voltage Vref3, the voltage at the first end of the time voltage comparator LMT IS less than or equal to the voltage at the second end of the time voltage comparator LMT, the time voltage comparator LMT outputs a third second signal, and the third second signal IS the over-current signal. In this embodiment, by adjusting the discharge current of the third current source IS3, the time when the voltage at the first end of the reference capacitor Cb drops from the preset reference voltage VDD to the third reference voltage Vref3 may be changed, for example, when the third fourth switch K34 IS turned on and the other switches are turned off, the discharge current IS minimum, corresponding to the first fourth preset time period, the delay time period IS longest, when the third switch K33 IS turned on and the other switches are turned off, the discharge current IS second small, corresponding to the first third preset time period, the delay time period IS second long, when the third switch K32 IS turned on and the other switches are turned off, the discharge current IS second large, corresponding to the first second preset time period, the delay time period IS second short, and when the third switch K31 IS turned on and the other switches are turned off, the discharge current IS maximum, corresponding to the first preset time period, and the delay time period IS shortest.

In this embodiment, when the first battery signal IS smaller than the first one-to-one reference voltage Vref11, the first one-to-one voltage comparator LM11 outputs a first one-to-one signal, the first two-voltage comparator LM12 outputs a first three-signal, the first three-voltage comparator LM13 outputs a first five-signal, the voltage logic control unit 220 controls the third fourth switch K34 to be turned on, the third first switch K31-the third switch K33 to be turned off, the current of the third fourth current source IS34 IS a discharge current, and the delay time when the overcurrent occurs IS a first fourth preset duration.

When the first battery signal IS greater than or equal to the first one-to-one reference voltage Vref11 and less than the first two-to-two reference voltage Vref12, the first one-to-one voltage comparator LM11 outputs the first two signals, the first two-to-two voltage comparator LM12 outputs the first three signals, the first three voltage comparator LM13 outputs the first five signals, the voltage logic control unit 220 controls the third switch K33 to be turned on, the third switch K31, the third second switch K32, and the third fourth switch K34 to be turned off, the current of the third current source IS33 IS a discharge current, and the delay time of the overcurrent IS a first preset duration.

When the first battery signal IS greater than or equal to the first second reference voltage Vref12 and less than the first third reference voltage Vref13, the first one-to-one voltage comparator LM11 outputs a first second signal, the first two voltage comparator LM12 outputs a first fourth signal, the first three voltage comparator LM13 outputs a first fifth signal, the voltage logic control unit 220 controls the third second switch K32 to be turned on, the third first switch K31, the third switch K33, and the third fourth switch K34 to be turned off, the current of the third second current source IS32 IS a discharge current, and the delay time of the overcurrent occurrence IS a first two preset duration.

When the first battery signal IS greater than or equal to the first reference voltage Vref13, the first one-to-one voltage comparator LM11 outputs a first two-signal, the first two-voltage comparator LM12 outputs a first four-signal, the first three-voltage comparator LM13 outputs a first six-signal, the voltage logic control unit 220 controls the third switch K31 to turn on, the third second switch K32-the third four-switch K34 to turn off, the current of the third current source IS31 IS a discharge current, and the delay time when the overcurrent occurs IS a first preset duration.

In the above-mentioned case, when the voltage at the first end of the reference capacitor Cb has not fallen to the third reference voltage Vref3 during the overcurrent process, the voltage at the first end of the reference capacitor Cb is instantaneously charged to the preset reference voltage VDD again when the voltage at the first end of the overcurrent voltage comparator LMC is changed from greater than or equal to the second reference voltage Vref2 to less than the second reference voltage Vref2, that is, the overcurrent voltage comparator LMC is changed from outputting the second signal to outputting the second signal, at this time, the first switch K41 is changed from off to on, the second switch K42 is changed from on to off, and the time length corresponding to the delay is reset.

In addition, in other embodiments of the present application, the current flowing through the third first current source IS31, the current flowing through the third second current source IS32, the current flowing through the third current source IS33, and the current flowing through the third fourth current source IS34 are not limited, for example, the current outputted by the 4 third current sources IS3 IS the same, when the first battery signal IS smaller than the first reference voltage Vref11, at this time, one of the third first switch K31 to the third fourth switch K34 IS turned on, and the remaining three are turned off, and the delay occurring when the excessive current flows IS the first preset duration, and the delay IS the longest; when the first battery signal is larger than or equal to the first one-to-one reference voltage Vref11 and smaller than the first two-to-one reference voltage Vref12, at the moment, two of the third switch K31 to the third four switch K34 are turned on, the remaining two switches are turned off, the delay of the occurrence of the overflow is a first third preset duration, and the delay is a second duration; when the first battery signal is larger than or equal to the first second reference voltage Vref12 and smaller than the first third reference voltage Vref13, three of the third switch K31 and the third fourth switch K34 are all on, the rest 1 is off, the delay of overcurrent is a first second preset duration, and the delay is a second short; when the first battery signal is greater than or equal to the first reference voltage Vref13, the third switch K31-the third switch K34 are all turned on, the delay of the occurrence of the overflow is a first preset duration, and the delay is the shortest. The first preset duration is less than the first second preset duration, the first third preset duration is less than the first fourth preset duration.

In addition, the change of the first preset duration IS not limited to changing the discharge current, but the capacitance value may also be changed, in other embodiments of the present application, please refer to fig. 6, where the delay unit 240 includes a time adjustment unit, a first switch K41, a second switch K42, a third current source IS3, and a time voltage comparator LMT, the time adjustment unit includes a plurality of reference capacitances Cb and a plurality of third switches, in this embodiment, the time adjustment unit IS used for adjusting the capacitance value, and further adjusts the first preset duration, where the number of reference capacitances Cb IS equal to the number of third switches, in this embodiment, the reference capacitances Cb correspond to a third reference capacitance Cb31, a third reference capacitance Cb32, a third reference capacitance Cb33, a third reference capacitance Cb34, and 4 third switches correspond to a third switch K31, a third switch K32, a third switch K33, a third switch K34, where the capacitance value of the third reference capacitance Cb31 IS less than the capacitance value of the third switch K32, and the third switch Cb33 are serially connected in this embodiment, and form a third branch reference capacitance of the third switch, and a third branch reference capacitance of the third switch Cb IS serially connected with the third switch Cb33, and the third branch reference capacitance of the third switch Cb32 IS serially connected with the third switch Cb33, and the third branch reference capacitance of the third switch Cb IS serially connected with the third switch Cb32, the third switch Cb IS serially connected with the third switch Cb, the second ends of the fourth branches are connected together and are commonly connected to the power ground GND, one end of the third current source IS3 IS connected to the power ground GND, the other end of the third current source IS3 IS connected to the first end of the time-voltage comparator LMT via the second switch K42, the first end of the time-voltage comparator LMT IS further connected to the second end of the first switch K41, the first end of the first switch K41 IS connected to a preset reference voltage VDD, for example, a fixed voltage of 5V, 4V, etc., the second end of the time-voltage comparator LMT IS connected to a preset third reference voltage Vref3, the third reference voltage Vref3 IS smaller than the preset reference voltage VDD, and the output end of the time-voltage comparator LMT IS connected to the switch control unit 140. Here, the control terminal of the third first switch K31, the control terminal of the third second switch K32, the control terminal of the third switch K33, and the control terminal of the third fourth switch K34 are respectively connected to the voltage logic control unit 220 for controlling the capacitance value of the reference capacitor Cb. The control end of the first switch K41 and the control end of the second switch K42 are both connected with the output end of the over-current voltage comparator LMC. Similarly, the different first battery signals correspond to different capacitance values, and the same third current source IS3 IS shared, so that the different capacitance values can cause different discharging time from the preset reference voltage VDD to be lower than or equal to the third reference voltage Vref3, and further cause different first preset time periods, so as to obtain a first preset time period, a first second preset time period, a first third preset time period and a first fourth preset time period, and the specific principle IS similar to that of fig. 5 and IS not repeated herein.

In addition, in other embodiments of the present application, similar to the scheme of fig. 6, the capacitance value of the third first reference capacitor Cb31, the capacitance value of the third second reference capacitor Cb32, the capacitance value of the third reference capacitor Cb33, and the capacitance value of the third fourth reference capacitor Cb34 are not limited, for example, the capacitance values of the 4 reference capacitors Cb are the same, when the first battery signal is smaller than the first reference voltage Vref11, the third switch K31-the third fourth switch K34 are all turned on, the capacitance value of the total reference capacitor Cb is the largest, and the delay occurring when the overflow occurs is the first fourth preset duration; when the first battery signal is greater than or equal to the first one-to-one reference voltage Vref11 and less than the first two-to-one reference voltage Vref12, at this time, three of the third switch K31-the third four switch K34 are turned on, the rest is turned off and turned off, the capacitance value of the total reference capacitance Cb is second largest, and the delay of occurrence of the overflow is a first third preset duration; when the first battery signal is larger than or equal to the first second reference voltage Vref12 and smaller than the first third reference voltage Vref13, two of the third switch K31-the third fourth switch K34 are turned on, the rest 2 switches are turned off, the capacitance value of the total reference capacitor Cb is second smallest, and the delay of overcurrent occurrence is a first second preset duration; when the first battery signal is greater than or equal to the first reference voltage Vref13, at this time, one of the third switch K31 to the third fourth switch K34 is turned on, the remaining switches are turned off, the capacitance value of the total reference capacitance Cb is minimum, and the delay of occurrence of the overcurrent is a first preset duration. The first preset duration is less than the first second preset duration, the first third preset duration is less than the first fourth preset duration.

In addition, the change of the first preset duration IS not limited to changing the discharge current, but the charge current may be changed to change the delay duration, where the delay duration corresponds to the charge duration, in other embodiments of the present application, please refer to fig. 7, where the delay unit 240 includes a time adjustment unit, a first switch K41, a second switch K42, a reference capacitor Cb, and a time-voltage comparator LMT, the time adjustment unit includes a plurality of third current sources IS3 and a plurality of third switches, in this embodiment, the time adjustment unit IS used to adjust the magnitude of the charge current, and further adjust the first preset duration, where the first preset duration corresponds to the charge duration, and the number of third current sources IS3 IS equal to the number of third switches, in this embodiment, 4 third current sources IS3 correspond to the third current sources IS31, IS32, IS33, and IS34, the 4 third switches are corresponding to a third first switch K31, a third second switch K32, a third switch K33 and a third fourth switch K34, wherein the current generated by the third first current source IS31 IS greater than the current generated by the third second current source IS32 IS greater than the current generated by the third current source IS33 IS greater than the current generated by the third fourth current source IS34, the third first switch K31 IS connected with the third first current source IS31 in series to form a first branch, the third second switch K32 IS connected with the third second current source IS32 in series to form a second branch, the third switch K33 IS connected with the third current source IS33 in series to form a third branch, the third fourth switch K34 IS connected with the third fourth current source IS34 in series to form a fourth branch, the first end of the first branch, the first end of the second branch, the first end of the fourth branch and the first end of the fourth branch are connected with the first end of the reference capacitor Cb through a second switch K42, the second end of the first branch, the second end of the second branch, the second end of the third branch and the second end of the fourth branch are connected together to jointly receive a preset reference voltage VDD, the second end of the reference capacitor Cb is connected with the power ground GND, the first end of the reference capacitor Cb is also connected with the second end of the first switch K41, the first end of the first switch K41 is connected with the power ground GND, the first end of the reference capacitor Cb is also connected with the first end of the time-voltage comparator LMT, the second end of the time-voltage comparator LMT is connected with a third reference voltage Vref3, the third reference voltage Vref3 is larger than the voltage of the power ground GND, and the output end of the time-voltage comparator LMT is connected with the switch control unit 140. Here, the control terminal of the third first switch K31, the control terminal of the third second switch K32, the control terminal of the third switch K33, and the control terminal of the third fourth switch K34 are respectively connected to the voltage logic control unit 220 for controlling the charging current. The control end of the first switch K41 and the control end of the second switch K42 are both connected with the output end of the over-current voltage comparator LMC.

Referring to fig. 7, when the intelligent electronic switch works normally, the first switch K41 is turned on (default state), the second switch K42 is turned off, the reference capacitor Cb is instantaneously discharged to the voltage of the power ground GND, the voltage of the first end of the time-voltage comparator LMT is smaller than the voltage of the second end thereof, and the time-voltage comparator LMT outputs a third signal; when the voltage of the first end of the over-current voltage comparator LMC IS greater than or equal to the second reference voltage Vref2 due to the occurrence of the over-current, the second switch K42 IS turned on, the first switch K41 IS turned off, the reference capacitor Cb IS charged by the third current source IS3, when the voltage of the reference capacitor Cb rises from the voltage of the power ground GND to be greater than or equal to the third reference voltage Vref3, the voltage of the first end of the time voltage comparator LMT IS greater than or equal to the voltage of the second end of the time voltage comparator LMT, the time voltage comparator LMT outputs a third second signal, and the third second signal IS the over-current signal. Similarly, different first battery signals correspond to different charging currents, and as the same reference capacitor Cb is shared, different charging currents can cause different charging times to reach the third reference voltage Vref3, and further cause different first preset durations, so as to obtain a first preset duration, a first second preset duration, a first third preset duration and a first fourth preset duration, and the specific principle is similar to that of fig. 5, and will not be repeated here. Similarly, referring to fig. 8, the charging current IS unchanged, that IS, the third current source IS3 IS unchanged, a plurality of parallel reference capacitors Cb may be provided, each of the reference capacitors Cb IS connected in series with a corresponding switch, and the control terminal of the switch IS connected to the voltage logic control unit 220, and the specific principle may be referred to the scheme of fig. 6 and will not be described herein.

In addition, in other embodiments of the present application, similar to the scheme of fig. 7, the current flowing through the third current source IS31, the current flowing through the third second current source IS32, the current flowing through the third current source IS33, and the current flowing through the third fourth current source IS34 are not limited, for example, the currents outputted by the 4 third current sources IS3 are the same, and different charging durations may be implemented by controlling the third first switch K31 to the third fourth switch K34 to be partially/fully turned on and partially/fully turned off, so as to obtain a first preset duration, a first second preset duration, a first third preset duration, and a first fourth preset duration. Similarly, in other embodiments of the present application, referring to fig. 8, the capacitance value of the third first reference capacitor Cb31, the capacitance value of the third second reference capacitor Cb32, the capacitance value of the third reference capacitor Cb33, and the capacitance value of the third fourth reference capacitor Cb34 are not limited, for example, the capacitance values of the 4 reference capacitors Cb are the same, and different charging durations may be implemented by controlling the third first switch K31 to the third fourth switch K34 to be partially/fully turned on and partially/fully turned off, so as to obtain a first one-to-one preset duration, a first two preset durations, a first three preset duration, and a first four preset duration.

The embodiment achieves different first preset durations through capacitor discharging/charging, does not need to set the reference oscillator 241, is beneficial to reducing cost, and is easy to achieve.

In addition, in the above implementation manner, the manner of discharging to the third reference voltage Vref3 or charging to the third reference voltage Vref3 to generate the over-current signal is not limited to the above-mentioned time-voltage comparator LMT, but may be implemented by a trigger, for example, by a schmitt trigger, which is a conventional technology in the art and will not be described herein. In addition, in other embodiments of the present application, the capacitance of the reference capacitor and the current of the third current source may not be adjusted, the third reference voltage may be adjusted according to the first battery signal, and the adjustment manner of the third reference voltage may refer to the adjustment manner of the second reference voltage in the fourth embodiment, which is not described herein.

Third embodiment

Referring to fig. 9a, fig. 9a is a circuit block diagram of the connection between the overcurrent detection and judgment module and the switch control unit, and the first current sampling resistor in the third embodiment of the present application, and this embodiment is similar to the first embodiment, so that a part not described in this embodiment may refer to the first embodiment, and the main difference between this embodiment and the first embodiment is that the first preset duration is adjusted in all directions according to the first battery signal, and the two are in a linear relationship.

Referring to fig. 1a and fig. 9a in combination, in the present embodiment, the overcurrent detection and judgment module 200 includes a delay unit 240, where the delay unit 240 is configured to adjust a first preset duration in real time and in an electrodeless manner according to a first battery signal.

Specifically, the delay unit 240 adjusts a first preset time length through a discharge time length, the delay unit 240 includes a voltage-controlled current source 243, a first switch K41, a second switch K42, a reference capacitor Cb, and a time-voltage comparator LMT, where a control end of the voltage-controlled current source 243 is connected to a first battery signal, a first end of the voltage-controlled current source 243 is connected to a first end of the reference capacitor Cb through the second switch K42, a second end of the voltage-controlled current source 243 is connected to a power ground GND, a second end of the reference capacitor Cb is connected to the power ground GND, the first end of the reference capacitor Cb is further connected to a second end of the first switch K41 and a first end of the time-voltage comparator LMT, the first end of the first switch K41 is connected to a preset reference voltage VDD, the second end of the time-voltage comparator LMT is connected to a preset third reference voltage Vref3, and an output end of the time-voltage comparator LMT is connected to the switch control unit 140. In this embodiment, the output current of the voltage-controlled current source 243 is proportional to the first battery signal, and the output current of the voltage-controlled current source 243 is in a linear relationship, and the first preset time period is inversely proportional to the first battery signal, that is, the larger the first battery signal is, the shorter the time from the preset reference voltage VDD to the third reference voltage Vref3 is, the smaller the first preset time period is, the smaller the time period when the overcurrent time delay occurs is, the smaller the first battery signal is, the smaller the output current of the voltage-controlled current source 243 is, the longer the time from the preset reference voltage VDD to the third reference voltage Vref3 is, the larger the first preset time period is, and the longer the overcurrent time delay occurs.

In addition, in other embodiments of the present application, referring to fig. 9b, the delay unit 240 adjusts a first preset time length through a charging time length, the delay unit 240 includes a voltage-controlled current source 243, a first switch K41, a second switch K42, a reference capacitor Cb, and a time-voltage comparator LMT, wherein a control end of the voltage-controlled current source 243 is connected to a first battery signal, a first end of the voltage-controlled current source 243 is connected to a first end of the reference capacitor Cb through the second switch K42, a second end of the voltage-controlled current source 243 is connected to a preset reference voltage VDD, a second end of the reference capacitor Cb is connected to a power ground GND, a first end of the reference capacitor Cb is also connected to a second end of the first switch K41, a first end of the time-voltage comparator LMT is connected to the power ground GND, a second end of the time-voltage comparator LMT is connected to a preset third reference voltage Vref3, and an output end of the time-voltage comparator LMT is connected to the switch control unit 140. In this embodiment, the output current of the voltage-controlled current source 243 is proportional to the first battery signal, and the output current of the voltage-controlled current source 243 is in a linear relationship, and the first preset time period is inversely proportional to the first battery signal, that is, the larger the first battery signal is, the larger the output current of the voltage-controlled current source 243 is, the shorter the time period from the voltage of the power ground GND to the third reference voltage Vref3 is, the smaller the first preset time period is, the smaller the time period when the overcurrent time delay occurs is, the smaller the first battery signal is, the smaller the output current of the voltage-controlled current source 243 is, the longer the time from the voltage of the power ground GND to the third reference voltage Vref3 is, the larger the first preset time period is, and the time period when the overcurrent time delay occurs is longer.

According to the embodiment, the first preset duration is subjected to refined management, the first preset duration and the first battery signal are in linear relation, different first battery signals have different first preset durations, so that the risk of damage to the main channel components due to larger battery voltage can be further reduced, the reliability can be further improved, and the cost is lower.

Fourth embodiment

Referring to fig. 10, fig. 10 is a circuit block diagram of the overcurrent detection and judgment module, the switch control unit and the first current sampling resistor according to the fourth embodiment of the present application, and the present embodiment is similar to the first embodiment-the third embodiment, so that the undescribed portion of the present embodiment can refer to the first embodiment-the third embodiment, and the main difference between the present embodiment and the first embodiment-the third embodiment is that the second reference voltage Vref2 can also be adjusted according to the battery voltage.

Referring to fig. 1a and fig. 10 in combination, in the present embodiment, the second reference voltage Vref2 is adjustable according to the first battery signal as long as the first preset duration. Specifically, in the present embodiment, the overcurrent detection and judgment module 200 includes a second reference voltage Vref2 generation adjustment unit 230, and the second reference voltage Vref2 generation adjustment unit 230 is configured to adjust the second reference voltage Vref2 according to the first battery signal.

In the present embodiment, the second reference voltage Vref2 generation adjustment unit 230 includes a second reference voltage Vref2 generation unit 231 and a second reference voltage Vref2 adjustment unit (not labeled in the figure). The second reference voltage Vref2 generating unit 231 is configured to generate a plurality of second reference voltages Vref2, in this embodiment, taking 4 second reference voltages Vref2 as an example, the 4 second reference voltages Vref2 correspond to the second first reference voltage Vref21, the second reference voltage Vref22, the second third reference voltage Vref23, the second fourth reference voltage Vref24, and the 4 second reference voltages Vref2 are respectively output, where the second first reference voltage Vref21 < the second reference voltage Vref22 < the second third reference voltage Vref23 < the second fourth reference voltage Vref24. In this embodiment, the second reference voltage Vref2 adjusting unit includes a plurality of second switches, the number of the second switches is equal to the number of the generated second reference voltages Vref2, the plurality of second switches are corresponding to a second first switch K21, a second switch K22, a second third switch K23, and a second fourth switch K24, wherein a first end of the second first switch K21 is connected to the second reference voltage Vref2 generating unit 231 for receiving the second reference voltage Vref21, a second end of the second switch K21 is connected to a second end of the over-current voltage comparator LMC, and a control end of the second switch K21 is connected to the voltage logic control unit 220, and in particular, is connected to a control end of the third switch K31; the first end of the second switch K22 is connected to the second reference voltage Vref2 generating unit 231 for receiving the second reference voltage Vref22, the second end of the second switch K22 is connected to the second end of the over-current voltage comparator LMC, and the control end of the second switch K22 is connected to the voltage logic control unit 220, specifically to the control end of the third switch K32; the first end of the second third switch K23 is connected to the second reference voltage Vref2 generating unit 231 for receiving the second third reference voltage Vref23, the second end of the second third switch K23 is connected to the second end of the over-current voltage comparator LMC, and the control end of the second third switch K23 is connected to the voltage logic control unit 220, specifically to the control end of the third switch K33; the first end of the second fourth switch K24 is connected to the second reference voltage Vref2 generating unit 231 for receiving the second fourth reference voltage Vref24, the second end of the second fourth switch K24 is connected to the second end of the over-current voltage comparator LMC, and the control end of the second fourth switch K24 is connected to the voltage logic control unit 220, specifically to the control end of the third fourth switch K34. In this embodiment, the output signals of the voltage logic control unit 220 are used to control the on or off states of the second first switch K21, the second switch K22, the second third switch K23, and the second fourth switch K24, wherein one of the 4 switches is generally turned on at one time, and of course, the 4 switches may be turned off. In the present embodiment, the voltage logic control unit 220 controls the magnitude of the second reference voltage Vref2 input to the second terminal of the over-current voltage comparator LMC according to the output signals of the first one-to-one voltage comparator LM11, the first two-voltage comparator LM12, and the first three-voltage comparator LM 13. In this embodiment, the second first switch K21, the second switch K22, the second third switch K23, and the second fourth switch K24 include an NMOS transistor, a PMOS transistor, a triode, a field effect transistor, or a transmission gate. In the present embodiment, the implementation of the second reference voltage Vref2 generation unit 231 may be implemented by a conventional resistor voltage division, for example, by five voltage division resistors to output 4 second reference voltages Vref2. Of course, it will be appreciated by those skilled in the art that the generation of the 4 second reference voltages Vref2 may also be achieved in other conventional manners.

In this embodiment, when the first battery signal is smaller than the first one-to-one reference voltage Vref11, the first one-to-one voltage comparator LM11 outputs a first one-to-one signal, the first two-voltage comparator LM12 outputs a first three-signal, the first three-voltage comparator LM13 outputs a first five-signal, the voltage logic control unit 220 controls the third fourth switch K34 to be turned on, the third first switch K31-third switch K33 to be turned off, the duration selection unit selects the first four preset duration to function, meanwhile, the voltage logic control unit 220 controls the second fourth switch K24 to be turned on, the second first switch K21-second third switch K23 to be turned off, and the second end of the over-current voltage comparator LMC is input with the second four reference voltage Vref24. When the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second fourth reference voltage Vref24, the delay time generating unit 242 is triggered to start timing, and when the duration that the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second fourth reference voltage Vref24 is greater than or equal to the first fourth preset time, the delay time generating unit 242 generates an over-current signal and outputs the over-current signal to the switch control unit 140 via the third fourth switch K34.

When the first battery signal is greater than or equal to the first one-to-one reference voltage Vref11 and less than the first two-to-two reference voltage Vref12, the first one-to-one voltage comparator LM11 outputs the first two signals, the first two-to-two voltage comparator LM12 outputs the first three signals, the first three voltage comparator LM13 outputs the first five signals, the voltage logic control unit 220 controls the third switch K33 to be turned on, the third switch K31, the third two switch K32 and the third four switch K34 to be turned off, the duration selection unit selects the first preset duration to be active, and at the same time, the voltage logic control unit 220 controls the second third switch K23 to be turned on, the second first switch K21, the second switch K22 and the second four switch K24 to be turned off, and the second end of the over-current voltage comparator LMC is input with the second third reference voltage Vref23. When the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second third reference voltage Vref23, the delay time period generating unit 242 is triggered to start timing, and when the duration that the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second third reference voltage Vref23 is greater than or equal to the first preset time period, the delay time period generating unit 242 generates an over-current signal and outputs the over-current signal to the switch control unit 140 via the third switch K33.

When the first battery signal is greater than or equal to the first second reference voltage Vref12 and less than the first third reference voltage Vref13, the first one-to-one voltage comparator LM11 outputs a first second signal, the first two voltage comparator LM12 outputs a first fourth signal, the first three voltage comparator LM13 outputs a first fifth signal, the voltage logic control unit 220 controls the third second switch K32 to be turned on, the third first switch K31, the third switch K33, and the third fourth switch K34 to be turned off, the duration selection unit selects the first two preset durations to be active, and at the same time, the voltage logic control unit 220 controls the second switch K22 to be turned on, the second first switch K21, the second third switch K23, and the second fourth switch K24 to be turned off, and the second end of the over-current voltage comparator LMC is input with the second reference voltage Vref22. When the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second reference voltage Vref22, the delay time is triggered to start timing, and when the duration that the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second reference voltage Vref22 is greater than or equal to the first two preset time, the delay time generating unit 242 generates an over-current signal and outputs the over-current signal to the switch control unit 140 via the third second switch K32.

When the first battery signal is greater than or equal to the first third reference voltage Vref13, the first one-to-one voltage comparator LM11 outputs a first two-signal, the first two-to-one voltage comparator LM12 outputs a first four-signal, the first three-voltage comparator LM13 outputs a first six-signal, the voltage logic control unit 220 controls the third first switch K31 to turn on, the third second switch K32-the third four-switch K34 to turn off, the duration selection unit selects a first preset duration to function, meanwhile, the voltage logic control unit 220 controls the second first switch K21 to turn on, the second switch K22-the second four-switch K24 to turn off, and the second end of the over-current voltage comparator LMC is input with the second first reference voltage Vref21. When the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second first reference voltage Vref21, the delay time generating unit 242 is triggered to start timing, and when the duration that the voltage at the first end of the over-current voltage comparator LMC is greater than or equal to the second first reference voltage Vref21 is greater than or equal to the first preset time period, the delay time generating unit 242 generates an over-current signal and outputs the over-current signal to the switch control unit 140 via the third switch K31.

In addition, in other embodiments of the present application, the generation manner of the second first reference voltage Vref 21-second fourth reference voltage Vref24 is not limited to the present embodiment, and one skilled in the art can generate the second first reference voltage Vref 21-second fourth reference voltage Vref24 in other manners. In addition, in other embodiments of the present application, the second reference voltage Vref2 is not limited to 4 kinds in number, and more or less kinds may be set as needed.

According to the embodiment, the corresponding second reference voltage Vref2 and the corresponding first preset time length are obtained according to the first battery signal representing the battery voltage, and the larger the first battery signal is, the smaller the second reference voltage Vref2 is, the smaller the first preset time length is, through the arrangement, overcurrent can be found early, the heating value of relevant components when the overcurrent occurs can be further reduced, the components on a main path can be protected, such as the protection power switch 130, the first current sampling resistor Ri1 and the like, so that the electronic components on the main path are not easy to damage, the reliability of the intelligent electronic switch is improved, and the overcurrent is not easy to be misjudged.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

It should be understood that references herein to "a plurality" are to two or more. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are referred to each other. For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.

The foregoing disclosure is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the claims herein, as the equivalent of the claims herein shall be construed to fall within the scope of the claims herein.

Claims

1. An intelligent electronic switch, comprising:

the power supply device comprises a power supply end, a power grounding end, a load output end and a switch control unit, wherein the power supply end is used for being connected with the positive electrode of a battery, the power grounding end is used for being connected with the negative electrode of the battery, and the load output end is used for being connected with a load;

the power switch is used for being connected with a load in series, one end of the power switch is connected with a power supply end or a power ground end, the other end of the power switch is connected with a load output end, a control end of the power switch is connected with a switch control unit, and the switch control unit is used for controlling the power switch to be turned on, turned off and turned off;

2. The intelligent electronic switch according to claim 1, wherein the overcurrent detection and judgment module comprises a voltage classification unit and a voltage logic control unit, wherein the input end of the voltage classification unit is connected with the first battery information, the output end of the voltage classification unit is connected with the voltage logic control unit, the voltage classification unit presets a plurality of range intervals, the range intervals are different, and the voltage classification unit classifies the first battery information into the corresponding range intervals and outputs the corresponding signals to the voltage logic control unit.

3. The intelligent electronic switch according to claim 2, wherein the overcurrent detection and judgment module comprises a delay unit, the delay unit is connected with the voltage logic control unit, the delay unit is used for generating a plurality of first preset time periods, the number of the first preset time periods corresponds to the number of the range intervals, and the delay unit is used for selecting the corresponding first preset time periods according to signals of the voltage logic control unit.

4. The intelligent electronic switch according to claim 3, wherein the delay unit comprises a reference oscillator, a delay time generation unit and a time selection unit, the delay time generation unit is respectively connected with the reference oscillator and the time selection unit, the delay time generation unit generates a plurality of first preset time periods based on the reference oscillator, the time selection unit comprises a plurality of third switches, the number of the third switches corresponds to the number of the range intervals, first ends of each of the plurality of third switches are respectively connected with the delay time generation unit to correspondingly select one of a plurality of first preset time periods, second ends of the plurality of third switches are connected together, the switch control unit is connected with the second ends of the plurality of third switches or is connected with the delay time generation unit, control ends of the plurality of third switches are respectively connected with the voltage logic control unit, and the plurality of third switches are controlled to be turned on or off according to signals of the voltage logic control unit so as to select the corresponding first preset time periods.

5. The intelligent electronic switch of claim 3, wherein the delay unit is coupled to the voltage logic control unit, the delay unit comprising a reference capacitor and a plurality of third current sources, the voltage logic unit selecting one or more of the plurality of third current sources to operate to adjust a current charging or discharging the reference capacitor to adjust a first predetermined time period, wherein the first predetermined time period is a time period required for the reference capacitor to charge to a predetermined third reference voltage or a time period required for the reference capacitor to discharge to the predetermined third reference voltage; or,

6. The intelligent electronic switch according to claim 1, wherein the overcurrent detection and judgment module comprises a delay unit, the delay unit adjusts the first preset time length according to the first battery signal, the delay unit comprises a voltage-controlled current source and a reference capacitor, a control end of the voltage-controlled current source is connected with the first battery signal, an output current of the voltage-controlled current source is in direct proportion to the first battery signal, a current output by the voltage-controlled current source is used for charging or discharging the reference capacitor, and the first preset time length is a time required for charging the reference capacitor to a third reference voltage through the voltage-controlled current source, or the first preset time length is a time required for discharging the reference capacitor to the third reference voltage through the voltage-controlled current source.

7. The intelligent electronic switch of any one of claims 1-6, wherein the over-current detection and determination module comprises a battery voltage sampling unit, the battery voltage sampling unit is configured to be connected to an anode of a battery, the battery voltage sampling unit is further configured to be connected to a power ground, and the battery voltage sampling unit is configured to convert a battery voltage into first battery information, wherein the first battery information is smaller than the battery voltage.

8. The intelligent electronic switch according to any one of claims 1-6, wherein the over-current detection and judgment module further comprises a current sampling unit, the current sampling unit is configured to convert a current flowing through the power switch into sampled current information, and the sampled current information is a voltage.

9. The intelligent electronic switch according to any one of claims 1 to 6, wherein the overcurrent detection and judgment module further comprises an overcurrent voltage comparator and a delay unit, a first end of the overcurrent voltage comparator is connected with sampling current information, a second end of the overcurrent voltage comparator is connected with a second reference voltage, an output end of the overcurrent voltage comparator is connected with the delay unit, the delay unit is further connected with the switch control unit, the delay unit is used for adjusting the first preset time length according to the first battery signal, when the voltage of the first end of the overcurrent voltage comparator is greater than or equal to the voltage of the second end, the delay unit counts the time length of the second signal, when the counted time length of the delay unit reaches the first preset time length, the overcurrent signal is output to the switch control unit, and the switch control unit controls the power switch to be turned off.

10. The intelligent electronic switch of claim 9, wherein the over-current detection and determination module further comprises a second reference voltage generation adjustment unit, the second reference voltage generation adjustment unit being connected to the second end of the over-current voltage comparator, the second reference voltage generation adjustment unit being configured to adjust the second reference voltage according to the first battery signal, the larger the first battery signal, the smaller the second reference voltage.

11. An integrated circuit chip comprising the intelligent electronic switch of any one of claims 1-10, wherein the power supply terminal is a power supply pin, the power ground terminal is a power ground pin, and the load output terminal is a load output pin.

12. A chip product comprising the intelligent electronic switch of any one of claims 1-10, wherein elements of the intelligent electronic switch other than the power switch are located on a first integrated circuit chip and the power switch is located on a second integrated circuit chip;

13. An electronic device comprising an intelligent electronic switch according to any one of claims 1-10 or an integrated circuit chip according to claim 11 or a chip product according to claim 12;

14. The electronic device of claim 13, wherein the electronic device comprises an automobile.