CN116382385B - Temperature control method, temperature control circuit, intelligent electronic switch and automobile - Google Patents
Temperature control method, temperature control circuit, intelligent electronic switch and automobile Download PDFInfo
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- CN116382385B CN116382385B CN202310347325.6A CN202310347325A CN116382385B CN 116382385 B CN116382385 B CN 116382385B CN 202310347325 A CN202310347325 A CN 202310347325A CN 116382385 B CN116382385 B CN 116382385B
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- 238000009825 accumulation Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The embodiment of the application provides a temperature control method of an intelligent electronic switch, wherein the intelligent electronic switch comprises a power switch, and the power switch is used for being connected in series with a load and comprises the following components: outputting an overtemperature signal that the temperature at the power switch reaches a first preset temperature; controlling the intelligent electronic switch to enter an over-temperature protection state, wherein in the over-temperature protection state, the power switch is disconnected and cut off, when the temperature of the power switch is reduced to a second temperature threshold value, the intelligent electronic switch exits the over-temperature protection state, and after the intelligent electronic switch exits the over-temperature protection state, the power switch is opened and connected, and the second temperature threshold value is smaller than the first preset temperature; triggering to time, and triggering to count the times of receiving the over-temperature signal in an accumulated manner; judging whether the number of times counted in the first preset time period is larger than or equal to a first preset number; and if the judgment result is yes, controlling the power switch to maintain to be disconnected and cut off. The embodiment of the application also provides a temperature control circuit, an intelligent electronic switch and an automobile.
Description
Technical Field
The application relates to the field of intelligent semiconductor switches, in particular to a temperature control method of an intelligent electronic switch, a temperature control circuit, the intelligent electronic switch and an automobile.
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 characteristics, such as protection against over-temperature, overload, and short-circuit events. For example, there are power switches in intelligent electronic switches, and the power switches are turned off in case of an over temperature, an overload, or a short time, etc., so that the path of the battery to the load is disconnected.
The existing intelligent electronic switch comprises a power switch, the power switch is connected with a load in series, when the load is in short circuit or the load is a capacitive load, when the power switch is turned on, the current flowing through the power switch can be large, the upper power consumption of the electronic switch can be large, the intelligent electronic switch can generate heat to cause the temperature of the intelligent electronic switch to rise, and finally the intelligent electronic switch can be triggered to enter an over-temperature protection state, so that the power switch is turned off.
The existing intelligent electronic switch has two processing modes for over-temperature protection: with or without self-locking function. If the self-locking function is provided, the intelligent electronic switch can be self-locked after entering an over-temperature protection state, the power switch can be kept to be disconnected and cut off, the intelligent electronic switch can be always in a discharge stopping state, and even if the temperature at the power switch is reduced, the intelligent electronic switch can not be started and turned on any more unless the intelligent electronic switch is unlocked or restarted through an external signal. The method is effective for load short circuit, but the capacitive load can be locked by itself and cannot be started normally, so that the method is confusing for use. If the intelligent electronic switch does not have a self-locking function for over-temperature protection, the power switch is disconnected and cut off after the intelligent electronic switch enters an over-temperature protection state, discharge is stopped, and the power switch is restarted to be turned on after the temperature at the power switch is reduced. The method is effective for capacitive loads, but if the load is short-circuited, the method can lead to repeated on and off of the power switch, and the frequent on and off of the power switch can influence the reliability of the intelligent electronic switch.
Disclosure of Invention
The technical problem to be solved by the embodiment of the application is to provide a temperature control method, a temperature control circuit, an intelligent electronic switch and an automobile for the problem that whether the capacitive load or the load short circuit causes the over-temperature protection state cannot be distinguished by the intelligent electronic switch in the prior art, so that the intelligent electronic switch is puzzled in use. The intelligent electronic switch can be effectively distinguished whether the capacitive load or the load short circuit causes the intelligent electronic switch to enter an over-temperature protection state.
To solve the above technical problem, a first aspect of embodiments of the present application provides a temperature control method of an intelligent electronic switch, where the intelligent electronic switch includes a power switch, and the power switch is used to be connected in series with a load, including:
outputting an overtemperature signal that the temperature at the power switch reaches a first preset temperature;
controlling the intelligent electronic switch to enter an over-temperature protection state, wherein in the over-temperature protection state, the power switch is disconnected and cut off, when the temperature of the power switch is reduced to a second temperature threshold value, the intelligent electronic switch exits the over-temperature protection state, and after the intelligent electronic switch exits the over-temperature protection state, the power switch is opened and connected, and the second temperature threshold value is smaller than the first preset temperature;
Triggering to time, and triggering to count the times of receiving the over-temperature signal in an accumulated manner;
judging whether the number of times counted in the first preset time period is larger than or equal to a first preset number;
and if the judgment result is yes, controlling the power switch to maintain to be disconnected and cut off.
Wherein, still include: if the judgment result is negative, the power switch is controlled to be driven by the preset frequency and the preset duty ratio, and the intelligent electronic switch is not triggered to enter an over-temperature protection state when the power switch is driven by the preset frequency and the preset duty ratio.
The duration of driving the power switch with a preset frequency and a preset duty ratio is preset, or the number of times of opening and conducting the power switch with the preset frequency and the preset duty ratio is preset.
Wherein the range of the preset duty ratio is less than or equal to 30%, and the range of the preset frequency is less than or equal to 20kHz.
The range of the first preset time length is less than or equal to 10 seconds, and the range of the first preset number is more than or equal to 5 times.
The method further comprises the following steps before the step of acquiring the signal that the temperature at the power switch reaches the first preset temperature:
and controlling the intelligent electronic switch to enter a current limiting state, wherein the current flowing through the power switch in the current limiting state is a preset current value.
The step of triggering the accumulation counting of the times of receiving the over-temperature signal specifically comprises the following steps: triggering to count and adding 1 to the count; receiving the over-temperature signal again, and continuously adding 1 to the count; or,
after the step triggering and timing, the method further comprises the following steps: if the time length reaches the first preset time length, stopping counting and timing, and setting the count number and the time length to zero; or,
after the step triggering is performed to count the times of the intelligent electronic switch entering the over-temperature protection state in an accumulated manner, the method further comprises the following steps: if the time length is smaller than the first preset time length and the count number reaches the first preset number, stopping counting and timing, and setting the count number and the time length to zero.
A second aspect of the embodiments of the present application provides a temperature control circuit of an intelligent electronic switch, the intelligent electronic switch including a power switch, the power switch being configured to be connected in series with a load, comprising:
a temperature detection unit for being disposed adjacent to or embedded in the power switch;
the over-temperature protection unit is connected with the temperature detection unit and is used for outputting an over-temperature signal that the temperature at the power switch reaches a first preset temperature;
The first over-temperature control unit is used for being connected with the over-temperature protection unit and controlling the intelligent electronic switch to enter an over-temperature protection state, wherein in the over-temperature protection state, the power switch is disconnected and cut off, when the temperature of the power switch is reduced to a second temperature threshold value, the intelligent electronic switch exits the over-temperature protection state, and after the intelligent electronic switch exits the over-temperature protection state, the power switch is opened and connected, and the second temperature threshold value is smaller than the first preset temperature;
a timing unit for being triggered to perform timing;
the counting unit is used for being triggered to count the times of the intelligent electronic switch entering the over-temperature protection state in an accumulated mode;
the timing counting judging unit is used for judging whether the number of times of the intelligent electronic switch entering the over-temperature protection state in the first preset time period is larger than or equal to a first preset number;
and the second over-temperature control unit is used for controlling the power switch to maintain the disconnection and the cut-off if the judgment result of the timing count judgment unit is yes.
And the second over-temperature control unit is further used for controlling to drive the power switch with a preset frequency and a preset duty ratio if the judgment result of the timing counting judgment unit is negative, and not triggering the intelligent electronic switch to enter an over-temperature protection state when the power switch is driven with the preset frequency and the preset duty ratio.
A third aspect of the embodiments of the present application provides a temperature control circuit of an intelligent electronic switch, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the temperature control method of the intelligent electronic switch when executing the computer program.
The fourth aspect of the embodiment of the application provides an intelligent electronic switch, which comprises a power switch and the temperature control circuit.
The intelligent electronic switch is arranged on the same integrated circuit chip; or,
the intelligent electronic switch is characterized in that elements except a power switch and a temperature detection unit are arranged on a first integrated circuit chip, and the power switch and the temperature detection unit are arranged on a second integrated circuit chip.
A fifth aspect of the embodiments of the present application provides an automobile, including the above temperature control circuit or the above intelligent electronic switch;
the intelligent electronic switch is characterized by further comprising a battery and a load, wherein the positive electrode of the battery and the negative electrode of the battery are correspondingly connected with the intelligent electronic switch, and the load is connected with a power switch of the intelligent electronic switch in series.
The temperature control method provided by the embodiment of the application judges whether the number of times counted in the first preset time period is larger than or equal to the first preset number; if the judgment result is yes, judging that the intelligent electronic switch has a load short circuit fault, and controlling the power switch to be locked, disconnected and cut off at the moment, so that the intelligent electronic switch does not have the problems of frequent starting and conducting and frequent entering an over-temperature protection state in the background technology, and further improving the reliability of the intelligent electronic switch; if the judgment result is negative, the capacitive load is judged at the moment, and the power switch is not required to be locked to be disconnected and cut off when the over-temperature protection occurs, so that the intelligent electronic switch can be normally used, and the use effect of a user is not affected.
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. 1 is a circuit block diagram of a battery, intelligent electronic switch, load, etc. according to an embodiment of the present application;
FIG. 2 is a circuit block diagram of a battery, intelligent electronic switch, load, etc. according to another embodiment of the present application;
FIG. 3 is a flow chart of the steps of a temperature control method according to an embodiment of the present application;
FIG. 4a is a timing waveform diagram of a temperature control method according to an embodiment of the present application;
FIG. 4b is a timing waveform diagram of a temperature control method according to another embodiment of the present application;
FIG. 5 is a schematic block diagram of the connection of a temperature control circuit, power switch, etc. according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a temperature control circuit according to an embodiment of the present application;
description of the figure:
110-cell; 120-load; 130-a current limiting resistor; 140-anti-reverse diode; 150-fuses; 210-a power switch; 221-a current source; 222-a temperature detection unit; 230-a drive unit; 240-an over-temperature protection unit; 250-an internal power supply unit; 261-a timing unit; 262-counting unit; 270-a timing count judgment unit; 280-a current limiting protection unit; 291-a first over-temperature control unit; 292-a second overtemperature control unit; 300-a temperature control circuit; 310-memory; 320-a processor; VBAT-power supply terminal/pin; GND-power ground/pin; OUT-load output/pin.
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 end referred to in this application may or may not be an actual terminal, for example, only one end of a component or one end 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.
The embodiment of the application provides an automobile, which can be an electric automobile, such as an electric passenger car or an electric business car, and also can be a hybrid automobile or a fuel oil automobile, wherein the automobile comprises a battery, a load, a microprocessor and an intelligent electronic switch. The battery is generally a storage battery, and the storage battery provides voltages of 12V, 24V, 48V and the like outwards, but other types of batteries are also possible. The load comprises 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, an actuator, a motor, an Antilock Brake System (ABS), an Electronic Brake System (EBS), a fan or other system comprising an inductive load, for example a lighting element, such as a xenon arc lamp, for one or more wiper systems. The microprocessor is connected to the intelligent electronic switch, and is used for controlling the intelligent electronic switch, for example, for controlling whether a certain power switch (described later) in the intelligent electronic switch is turned on or not, and meanwhile, the intelligent electronic switch feeds back the state and related parameter information, for example, diagnostic related parameter information, to the microprocessor for processing by the microprocessor.
Referring to fig. 1, in the present embodiment, the intelligent electronic switch includes a power supply end VBAT, a power ground end GND, and a load output end OUT, wherein the power supply end VBAT is connected with a positive electrode of the battery 110 via a fuse 150, the power ground end GND is connected with a negative electrode of the battery 110, in the present embodiment, an anti-reverse diode 140 and a current limiting resistor 130 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 addition, in other embodiments of the present application, a reverse connection preventing diode and a current limiting resistor may not be disposed between the power ground GND and the negative electrode of the battery 110.
In this embodiment, the intelligent electronic switch further includes a power switch 210 and a driving unit 230, wherein one end of the power switch 210 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 VBAT, the control end of the power switch is connected with the driving unit 230, and the driving unit 230 is used for controlling whether the power switch 210 is turned on or not. In the present embodiment, the power switch 210 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 210 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 fig. 1, the power switch 210 is connected as a high-side switch, which is a switch connected between the power supply terminal VBAT and the load 120. However, the present application is not limited thereto, and in other embodiments of the present application, referring to fig. 2, the power switch 210 is connected as a low-side switch, which is connected between the load 120 and the power ground GND.
Referring to fig. 1, fig. 3 and fig. 5 in combination, an embodiment of the present application provides a temperature control method of an intelligent electronic switch, including the following steps:
s110: outputting an overtemperature signal that the temperature at the power switch reaches a first preset temperature;
in this embodiment, the intelligent electronic switch includes a temperature control circuit, the temperature control circuit includes a temperature detection unit 222 and an over-temperature protection unit 240, the temperature detection unit 222 is, for example, a temperature sensor, a diode, etc., and illustrated in fig. 1 by taking the diode as an example, the temperature detection unit 222 is disposed adjacent to or embedded in the power switch 210, a first end of the temperature detection unit 222 is connected to the over-temperature protection unit 240, a first end of the temperature detection unit 222 is further connected to the power supply end VBAT via a current source 221 and an internal power supply unit 250, and a second end of the temperature detection unit 222 is connected to the power ground GND. In other embodiments of the present application, the first end of the temperature detection unit 222 is connected to the power supply VBAT via the internal power supply unit 250, the second end of the temperature detection unit 222 is connected to the over-temperature protection unit 240, and the second end of the temperature detection unit 222 is also connected to the power ground GND via the current source 221. In this embodiment, the over-temperature protection unit 240 receives the temperature signal of the temperature detection unit 222, where the temperature signal is a voltage signal, the voltage signal on the temperature detection unit 222 is proportional to the temperature, and when the temperature detection unit 222 detects that the temperature at the power switch 210 is too high, for example, reaches the first preset temperature, the over-temperature protection unit 240 determines and outputs an over-temperature signal that the temperature at the power switch 210 reaches the first preset temperature through comparison.
S120, controlling the intelligent electronic switch to enter an over-temperature protection state, wherein in the over-temperature protection state, the power switch is disconnected and cut off, when the temperature of the power switch is reduced to a second temperature threshold value, the intelligent electronic switch exits the over-temperature protection state, and after the intelligent electronic switch exits the over-temperature protection state, the power switch is opened and is connected, and the second temperature threshold value is smaller than the first preset temperature;
in the present embodiment, the temperature control circuit includes a first over-temperature control unit 291, and the first over-temperature control unit 291 is connected to the over-temperature protection unit 240 and the driving unit 230. After the over-temperature protection unit 240 determines that the temperature at the power switch 210 reaches the signal of the first preset temperature, for example, the first preset temperature is 150 ℃ or more, for example, 150 ℃, 160 ℃, 170 ℃, 175 ℃, 180 ℃, etc., the over-temperature protection unit 240 outputs the over-temperature signal, the first over-temperature control unit 291 receives the over-temperature signal, and the first over-temperature control unit 291 controls the intelligent electronic switch to enter the over-temperature protection state through the driving unit 230. Specifically, the driving unit 230 controls the power switch 210 to be turned off in the over-temperature protection state.
In this embodiment, the over-temperature protection unit 240 includes a hysteresis comparator connected to the temperature detection unit 222, and when the temperature at the power switch 210 drops to the second temperature threshold, the over-temperature protection unit 240 outputs a normal signal to the first over-temperature control unit 291, the first over-temperature control unit 291 controls the intelligent electronic switch to exit the over-temperature protection state, and the driving unit 230 controls the power switch 210 to be turned on. In this embodiment, the second temperature threshold is less than the first preset temperature, and the second temperature threshold is, for example, less than or equal to 140 ℃, for example, 140 ℃, 135 ℃, 130 ℃, 125 ℃, 120 ℃, and the like.
S130: triggering to time, and triggering to count the times of receiving the over-temperature signal in an accumulated manner;
s140, judging whether the number of times counted in the first preset time period is larger than or equal to a first preset number;
the inventors of the present application found that, when the capacitive load 120 is brought into the over-temperature protection state, the power switch 210 charges the capacitive load 120 from the time period of being turned on to the over-temperature protection state, the voltage of the load output terminal OUT connected to one end of the capacitive load 120 is gradually increased (illustrated by a high-side switch in fig. 1 as an example), and as the number of times of the over-temperature protection state is increased, the voltage of the load output terminal OUT is increased due to the charging, and thus the power consumed on the power switch 210 is reduced, so that the duration required for triggering the over-temperature protection is longer and longer, that is, the interval duration between two adjacent over-temperature protection states is longer and longer. Correspondingly, when the load 120 is short-circuited to cause the overload protection state, the voltage of the load output end OUT connected with one end of the load 120 is kept unchanged, the voltage of the load output end OUT is not increased along with the increase of the times of the overload protection state, and the interval duration between two adjacent overload protection states is similar when the load 120 is short-circuited, and the difference is not large. Thus, from the foregoing description, it can be seen that: the time interval between two adjacent over-temperature protection states under two scenes of the load 120 is short-circuited, and the difference of the time interval is larger as the number of over-temperature protection passes is larger, for example, the number of times of entering the over-temperature protection state due to the short-circuit of the load 120 is larger within a certain time period, and likewise, the number of times of entering the over-temperature protection due to the capacitive load 120 is relatively smaller within the same certain time period.
In this embodiment, the temperature control circuit includes a timing unit 261 and a counting unit 262, the timing unit 261 and the counting unit 262 are both connected with the over-temperature protection unit 240, when the over-temperature protection unit 240 outputs an over-temperature signal, the timing unit 261 is triggered by an untimed state to start timing, that is, the timing unit 261 starts timing from 0, and the timing unit 261 continues timing. When the counter 262 receives the over-temperature signal, the counter 262 starts to operate, and the counter 262 increases by 1 based on the original count, for example, the count value of the original counter 262 is 0, and when the over-temperature signal is received, the count of the counter 262 increases by 1, that is, the count value becomes 1. In this embodiment, the over-temperature signal is an edge signal, such as a rising edge signal or a falling edge signal (see fig. 4a and 4 b).
In this embodiment, the temperature control circuit further includes a timing and counting determining unit 270, where the timing and counting determining unit 270 is connected to the timing unit 261 and the counting unit 262, respectively, and when the timing and counting determining unit 270 determines that the timing duration of the timing unit 261 is within the first preset duration, and the counting unit 262 counts more than or equal to the first preset number, the timing and counting determining unit 270 outputs the locking signal. In this embodiment, the first preset time period is generally less than or equal to 10s, and the first preset time period is, for example, 1s, 1.5s, 1.8s, 2s, 2.3s, 2.5s, 2.8s, 3s, 4s, 5s, 6s, 7s, 8s, 9s, 10s, and preferably 5s. In this embodiment, the first preset number is greater than or equal to 5 times, for example, 5 times, 6 times, 7 times, 8 times, 9 times, 10 times, 50 times, 100 times, etc.
In the present embodiment, when the timing count determination unit 270 obtains that the count unit 262 reaches the first preset number and the timing unit 261 does not reach the first preset duration, the timing count determination unit 270 outputs the lock signal, or the timing unit 261 such as the timing count determination unit 270 outputs the lock signal when the timing duration reaches the first preset duration. In other embodiments of the present application, the timing count determining unit 270 is connected to the timing unit 261 and the counting unit 262, when the timing unit 261 reaches the first preset duration, the timing unit 261 outputs a signal to the timing count determining unit 270, the timing count determining unit 270 obtains the count of the counting unit 262 at this time, then determines whether the count number is greater than or equal to the first preset number, if so, outputs a locking signal, and if so, maintains the original signal output.
In this embodiment, when the count of the counting unit 262 is greater than or equal to the first preset number in the first preset time period, the intelligent electronic switch determines that the load 120 has a short circuit fault, and when the count of the counting unit 262 is less than the first preset number in the first preset time period, the intelligent electronic switch determines that the load 120 is in an over-temperature protection state instead of the load 120 being in an over-temperature protection state due to the short circuit.
S151, if the judgment result is yes, controlling the power switch 210 to keep off;
and S152, if the judgment result is negative, controlling to drive the power switch in the first driving mode.
In this embodiment, the temperature control circuit includes a second over-temperature control unit 292, where the second over-temperature control unit 292 is connected to the timing and counting determination unit 270 and the driving unit 230, respectively, when the determination result of the timing and counting determination unit 270 is yes, the intelligent electronic switch determines that a short circuit fault occurs in the load 120, the timing and counting determination unit 270 outputs a locking signal, and the second over-temperature control unit 292 receives the locking signal, so as to control the driving unit 230 to control the power switch 210 to maintain the off state, i.e. the power switch 210 is locked to be off, so that, after the power switch 210 is turned off, the power switch 210 will not be turned on again, for example, after the temperature drops to the second temperature threshold or below, so that the power switch 210 will not be turned on or off repeatedly, and the reliability of the intelligent electronic switch will not be affected. In this embodiment, when the determination result of the timing count determining unit 270 is no, that is, the intelligent electronic switch determines that the capacitive load 120 causes the over-temperature protection state to be entered, the timing count determining unit 270 outputs a normal signal to the second over-temperature control unit 292, and the second over-temperature control unit 292 controls the driving unit 230 to normally control the power switch 210, which is referred to as a first control mode: that is, when the intelligent electronic switch enters the over-temperature protection state, the second over-temperature control unit 292 controls the power switch 210 to be turned off via the driving unit 230, when the temperature of the power switch 210 is reduced, the intelligent electronic switch exits the over-temperature protection state, the second over-temperature control unit 292 controls the power switch 210 to be turned on via the driving unit 230, when the voltage on the capacitive load 120 is gradually increased after entering the over-temperature protection state for a plurality of times, the intelligent electronic switch works normally after the voltage rises to meet the requirement, and then the capacitive load 120 does not enter the over-temperature protection state again due to the capacitive load 120, so that the capacitive load 120 can work normally in the embodiment without affecting the use of a user. In addition, in other embodiments of the present application, when the second over-temperature control unit 292 receives the normal signal, the second over-temperature control unit 292 may not operate at this time, and the power switch 210 is controlled to be turned on or off by the first over-temperature control unit 291 in the first control mode via the driving unit.
In this embodiment, the step of triggering to count the number of times of receiving the over-temperature signal specifically includes:
triggering to count and adding 1 to the count;
the over-temperature signal is received again and the count continues to increment by 1.
Specifically, after the counting unit 262 triggers counting and the timing unit 261 triggers timing, the timing unit 261 and the counting unit 262 do not stop working, when the temperature at the power switch 210 drops, the intelligent electronic switch exits the over-temperature protection state, the power switch 210 is turned on again, after the temperature of the power switch 210 rises again, the intelligent electronic switch enters the over-temperature protection state again, the timing unit 261 and the counting unit 262 acquire the over-temperature signal of the intelligent electronic switch entering the over-temperature protection state again, the counting unit 262 adds 1 on the basis of the original counting, for example, the count value of the original counting unit 262 is 1, and when the over-temperature signal is received again, the count value of the counting unit 262 is added 1, namely, the count value becomes 2; the timing unit 261 continues to operate, that is, after the timing unit 261 triggers the timing, as long as the timing unit 261 does not receive a signal for stopping the timing or resetting, the timing unit 261 continues to perform the timing, and the timing is not restarted because the over-temperature signal is received again.
In other embodiments of the present application, after the step triggering for timing, further comprising: if the time length reaches the first preset time length, stopping counting and timing, and setting the count number and the time length to zero.
Whether the determination result of the timing count determining unit 270 is yes or no, as long as the timing duration of the timing unit 261 reaches the first preset duration, the timing unit 261 resets, and meanwhile, the timing unit 261 sends a signal to the counting unit 262, the counting unit 262 resets, that is, the timing unit 261 stops timing, the counting unit 262 stops counting, and the timing duration is set to zero, the counting number is set to zero, the timing unit 261 and the counting unit 262 recover to an initial state, so that the later receiving of the over-temperature signal is facilitated. In the present embodiment, the timer count judgment unit 270 has completed judgment before the reset of the timer unit 261 and the counter unit 262.
In this embodiment, after the step of triggering to count up the number of times of receiving the over-temperature signal, the method further includes: if the time length is smaller than the first preset time length and the count number reaches the first preset number, stopping counting and timing, and setting the count number and the time length to zero.
If the count determining unit 270 obtains that the number counted by the counting unit 262 reaches the first preset number and the time duration of the counting unit 261 is less than the first preset time duration, the count determining unit 270 outputs a signal to the counting unit 261 and the counting unit 262, and the counting unit 262 and the counting unit 261 reset, where the signal may be the same as the locking signal or different signals.
Generally, for the capacitive load 120 with a relatively low capacitance value, after a plurality of charges for a first preset period of time, the voltage on the capacitive load 120 has risen to a voltage value meeting the requirement, and then the capacitive load 120 is not triggered to enter an over-temperature protection state due to the capacitive load 120, so that the intelligent electronic switch can work normally. However, with respect to the capacitive load 120 having a relatively large capacitance value, even after a plurality of charges of the first preset duration, the voltage on the capacitive load 120 cannot reach a voltage value that satisfies the requirement, and therefore, the overheat protection state is still relatively frequently entered due to the capacitive load 120, in order to solve the problem, a solution is provided as follows.
When the load 120 is determined to be the capacitive load 120, that is, the determination result of the timing count determining unit 270 is no, in order to achieve that the voltage on the capacitive load 120 with a relatively large capacitance value is raised to the voltage value meeting the requirement relatively fast, and in order to avoid relatively frequent entering into the overdischarge protection state, the temperature control method further includes: if the result is negative, the power switch 210 is controlled to be driven at the preset frequency and the preset duty ratio, and the intelligent electronic switch is not triggered to enter the over-temperature protection state when the power switch 210 is driven at the preset frequency and the preset duty ratio.
If the result of the timing count determining unit 270 is no, that is, the intelligent electronic switch determines that the capacitive load 120 is caused to enter the over-temperature protection state, at this time, for the capacitive load 120 with a relatively large capacitance value, the voltage on the capacitive load 120 has a relatively large probability of not being charged to the desired voltage, so as to continuously charge the capacitive load 120 and not trigger the over-temperature protection, the timing count determining unit 270 outputs a second mode entering signal, the second over-temperature control unit 292 receives the second mode entering signal, the second over-temperature control unit 292 controls the power switch 210 to be driven at a preset frequency and a preset duty ratio through the driving unit 230 (please refer to fig. 4 b), and the intelligent electronic switch is not triggered to enter the over-temperature protection state when the power switch 210 is driven at the preset frequency and the preset duty ratio. Through such a setting, the capacitive load 120 with a larger capacitance value can be charged to a desired voltage quickly, and then the overheat protection can not be triggered by the capacitive load 120, so that the intelligent electronic switch can work normally, and the temperature of the intelligent electronic switch can be reduced because the overheat protection state can not be triggered.
The duration of driving the power switch 210 at the preset frequency and the preset duty cycle is preset, for example, the preset duration is 10 seconds, and the preset duration may be set according to actual needs. In addition, in other embodiments of the present application, the power switch 210 is driven at a preset frequency and a preset duty cycle for a preset number of times of turning on and turning off, for example, a preset number of times is 10 times, and the preset number of times may be set according to actual needs.
The preset duty ratio is designed to be smaller, so that the over-temperature protection state is not triggered at this stage, the range of the preset duty ratio is less than or equal to 30%, such as the duty ratio is 30%, 25%, 20%, 15%, 10%, 9%, 8%, 7%, 6%, 5%, and the like, and the range of the preset frequency is less than or equal to 20kHz, such as 1kHz, 5kHz, 6kHz, 7kHz, 8kHz, 9kHz, 10kHz, 15kHz, 20kHz, and the like.
Here, after the capacitive load 120 drives the power switch 210 through the preset frequency and the preset duty cycle, if the capacitance value of the capacitive load is too large, the capacitive load 120 is not yet charged to the voltage meeting the requirement, the second over-temperature control unit 292 or the first over-temperature control unit 291 drives the power switch 210 in the first control mode, the intelligent electronic switch is in the over-temperature protection state, and then is triggered to count, and then the counted number of times in the first preset time period is judged to be smaller than the first preset number, and then the power switch 210 is driven again through the preset frequency and the preset duty cycle, so that the above steps are repeated until the capacitive load 120 with the too large capacitance value is charged to the voltage meeting the requirement, and then the intelligent electronic switch works normally, and after such processing, the number of times that the intelligent electronic switch enters the over-temperature protection state can be obviously reduced, which is beneficial to improving the reliability of the intelligent electronic switch.
In this embodiment, in order to prevent the load 120 from being shorted or prevent the capacitive load 120 from causing excessive current to flow when the power switch 210 is turned on just before turning on, please continue to refer to fig. 1, 3 and 5, before outputting the over-temperature signal that the temperature at the power switch reaches the first preset temperature, the method further includes:
s160, controlling the intelligent electronic switch to enter a current limiting state, wherein the current flowing through the power switch in the current limiting state is a preset current value.
The temperature control circuit includes a current limiting protection unit 280, where the current limiting protection unit 280 is configured to detect a current flowing through the power switch 210, and the current limiting protection unit 280 is further connected to a control terminal of the power switch 210, and when the current limiting protection unit 280 detects that the current flowing through the power switch 210 is large, for example, the current is large due to a short circuit of the capacitive load 120 or the load 120, the current limiting protection unit 280 controls the intelligent electronic switch to enter a current limiting state, and in the current limiting state, the power switch 210 enters a saturation region from a linear switching region, the current flowing through the power switch 210 is limited to a preset current value, where the preset current value is set to be relatively large, for example, the preset current value is 10A, 11A, 12A, 13A, 14A, 15A, and so on, so that the current value flowing through the power switch 210 can be prevented from further increasing. By this arrangement, the current value flowing through the power switch 210 can be limited, and adverse effects on the line and the power switch 210 due to the excessive current value flowing through the power switch 210 can be prevented.
Referring to fig. 1, 3 and 4a in combination, when it is determined that the load 120 is shorted, the timer count determination unit 270 outputs a lock signal at time t2, after which the power switch 210 remains turned off. The input control signals in fig. 4a and 4b are output by the microprocessor, and are used to control whether the corresponding power switch 210 of the intelligent electronic switch is turned on or not. Referring to fig. 1, 3 and 4b in combination, when the capacitive load 120 is determined, the power switch 210 is controlled to be driven at a preset frequency and a preset duty cycle after time t2 until time t 3.
Corresponding to the temperature control method of the intelligent electronic switch in the above embodiment, fig. 5 shows a block diagram of the temperature control circuit of the intelligent electronic switch and the connection of related elements provided in the embodiment of the present application, and for convenience of explanation, only the portions related to the embodiment of the present application are shown.
Referring to fig. 1 and 5 in combination, the temperature control circuit includes:
a temperature detection unit 222 for being disposed adjacent to the power switch 210 or embedded in the power switch 210;
an over-temperature protection unit 240 connected to the temperature detection unit 222, where the over-temperature protection unit 240 is configured to output an over-temperature signal that the temperature at the power switch 210 reaches a first preset temperature;
A first over-temperature control unit 291, configured to be connected to the over-temperature protection unit 240, and configured to control the intelligent electronic switch to enter an over-temperature protection state, where the power switch 210 is turned off in the over-temperature protection state, and when the temperature at the power switch 210 drops to a second temperature threshold, the intelligent electronic switch exits the over-temperature protection state, and after exiting the over-temperature protection state, the power switch 210 is turned on, and the second temperature threshold is smaller than the first preset temperature;
a timing unit 261 for being triggered to perform timing;
a counting unit 262 for being triggered to count up the number of times the over-temperature signal is received;
a timer count judgment unit 270 for judging whether the count value of the counting unit 262 is greater than or equal to a first preset number within a first preset time period;
and a second over-temperature control unit 292 for controlling the power switch 210 to maintain the off state if the determination result of the timer count determination unit 270 is yes.
In this embodiment, the second over-temperature control unit 292 or the first over-temperature control unit 291 is further configured to control the power switch 210 to be turned on or off in the first control mode if the determination result of the timing count determination unit 270 is negative.
In other embodiments of the present application, the second over-temperature control is further configured to control to drive the power switch 210 with a preset frequency and a preset duty cycle if the determination result of the timing count determination unit 270 is no, and not trigger the intelligent electronic switch to enter the over-temperature protection state when the power switch 210 is driven with the preset frequency and the preset duty cycle.
In this embodiment, the temperature control circuit further includes a current limiting protection unit 280, the current limiting protection unit 280 is configured to detect a current flowing through the power switch 210, the current limiting protection unit 280 is connected to a control end of the power switch 210, and when the current limiting protection unit 280 detects that the current flowing through the power switch 210 is larger, for example, greater than or equal to a threshold current, the current limiting protection unit 280 controls the intelligent electronic switch to enter a current limiting state, and the current flowing through the power switch 210 in the current limiting state is a preset current value.
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.
Fig. 6 is a schematic diagram of a temperature control circuit 300 of an intelligent electronic switch according to another embodiment of the present application. As shown in fig. 6, the temperature control circuit 300 of this embodiment includes: at least one processor 320 (only one is shown in fig. 6), a memory 310 and a computer program stored in the memory 310 and executable on the processor 320, which processor 320 implements the steps of the temperature control method embodiments described above when executing the computer program. It will be appreciated by those skilled in the art that fig. 6 is merely an example of temperature control circuit 300 and is not intended to limit temperature control circuit 300, and may include more or fewer components than shown, or may combine certain components, or may include different components, such as input-output devices, network access devices, etc. The processor 320 may be a central processing unit (Central Processing Unit, CPU), the processor 320 may also be other general purpose processors 320, digital signal processors 320 (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor 320 may be a microprocessor 320 or the processor 320 may be any conventional processor 320 or the like.
The memory 310 may be an internal storage unit of the temperature control circuit 300 in some embodiments, such as a hard disk or a memory of the temperature control circuit 300. The memory 310 may also be an external storage device of the temperature control circuit 300 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the temperature control circuit 300. Further, the memory 310 may also include both internal memory units and external memory devices of the temperature control circuit 300. The memory 310 is used to store an operating system, application programs, boot Loader (Boot Loader), data, and other programs, such as program code of the computer program. The memory 310 may also be used to temporarily store data that has been output or is to be output.
The present embodiment also provides a storage medium storing a computer program, where the computer program may implement the steps in the above-described embodiments of the temperature control method when executed by the processor 320.
The embodiment of the application also provides an intelligent electronic switch, which comprises a power switch 210, and the intelligent electronic switch further comprises the temperature control circuit.
The intelligent electronic switch is arranged on the same integrated circuit chip, namely the intelligent electronic switch is arranged on the same semiconductor substrate. The power supply end VBAT is a power supply pin VBAT, the power ground end GND is a power ground pin GND, and the load output end OUT is a load output pin OUT.
In other embodiments of the present application, the components of the intelligent electronic switch other than the power switch 210 and the temperature detection unit 222 are located on a first integrated circuit chip, the power switch 210 and the temperature detection unit 222 are located on a second integrated circuit chip, and the two integrated circuit chips are packaged together.
In addition, in other embodiments of the present application, the temperature control circuit and the intelligent electronic switch of the present embodiment are not limited to be used in automotive electronics, but may be used in fields of industrial automation, aerospace, and the like.
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 (10)
1. A method of temperature control of an intelligent electronic switch comprising a power switch for series connection with a load, comprising:
acquiring the temperature of a power switch;
outputting an overtemperature signal that the temperature at the power switch reaches a first preset temperature;
controlling the intelligent electronic switch to enter an over-temperature protection state, wherein in the over-temperature protection state, the power switch is disconnected and cut off, when the temperature of the power switch is reduced to a second temperature threshold value, the intelligent electronic switch exits the over-temperature protection state, and after the intelligent electronic switch exits the over-temperature protection state, the power switch is opened and connected, and the second temperature threshold value is smaller than the first preset temperature;
triggering to time, and triggering to count the times of receiving the over-temperature signal in an accumulated manner;
judging whether the number of times counted in the first preset time period is larger than or equal to a first preset number; wherein the time is continuously counted in the first preset time period or before the first preset number is reached;
if the judgment result is yes, the power switch is controlled to be kept off;
if the judgment result is negative, judging that the intelligent electronic switch is in an over-temperature protection state because of the capacitive load, controlling to drive the power switch at a preset frequency and a preset duty ratio at the moment, and not triggering the intelligent electronic switch to enter the over-temperature protection state when driving the power switch at the preset frequency and the preset duty ratio;
The step of triggering the accumulation and counting of the times of receiving the over-temperature signal specifically comprises the following steps: triggering to count and adding 1 to the count; receiving the over-temperature signal again, and continuously adding 1 to the count;
after the step triggering and timing, the method further comprises the following steps: if the time length reaches the first preset time length, stopping counting and timing, and setting the count number and the time length to zero; or,
after the step triggering is performed to count the times of the intelligent electronic switch entering the over-temperature protection state in an accumulated manner, the method further comprises the following steps: if the time length is smaller than the first preset time length and the count number reaches the first preset number, stopping counting and timing, and setting the count number and the time length to zero;
after the capacitive load drives the power switch through the preset frequency and the preset duty ratio, the capacitive load is not charged to the voltage meeting the requirement, the power switch is controlled to be driven, the intelligent electronic switch enters an over-temperature protection state, the intelligent electronic switch is triggered to count, the count time in the first preset time period is judged to be smaller than the first preset number, the power switch is driven through the preset frequency and the preset duty ratio, and the steps are repeated until the capacitive load with the overlarge capacitance value is charged to the voltage meeting the requirement, and then the intelligent electronic switch works normally.
2. The method according to claim 1, wherein the duration of driving the power switch at a preset frequency and a preset duty cycle is a preset duration, or the number of times the power switch is turned on and turned off at a preset frequency and a preset duty cycle is a preset number of times.
3. The method of claim 1, wherein the range of the preset duty cycle is 30% or less and the range of the preset frequency is 20kHz or less.
4. A method of controlling the temperature of an intelligent electronic switch according to any one of claims 1 to 3, wherein the first predetermined period of time ranges from less than or equal to 10 seconds and the first predetermined number of times ranges from greater than or equal to 5 times.
5. A method of controlling the temperature of an intelligent electronic switch according to any one of claims 1-3, characterized in that before the step of outputting a signal that the temperature at the power switch reaches a first preset temperature, further comprises:
and controlling the intelligent electronic switch to enter a current limiting state, wherein the current flowing through the power switch in the current limiting state is a preset current value.
6. A temperature control circuit of an intelligent electronic switch, the intelligent electronic switch comprising a power switch for connecting in series with a load, comprising:
A temperature detection unit for being arranged adjacent to or embedded in the power switch, the temperature detection unit being used for acquiring the temperature at the power switch;
the over-temperature protection unit is connected with the temperature detection unit and is used for outputting an over-temperature signal that the temperature at the power switch reaches a first preset temperature;
the first over-temperature control unit is used for being connected with the over-temperature protection unit and controlling the intelligent electronic switch to enter an over-temperature protection state, wherein in the over-temperature protection state, the power switch is disconnected and cut off, when the temperature of the power switch is reduced to a second temperature threshold value, the intelligent electronic switch exits the over-temperature protection state, and after the intelligent electronic switch exits the over-temperature protection state, the power switch is opened and connected, and the second temperature threshold value is smaller than the first preset temperature;
a timing unit for being triggered to perform timing;
the counting unit is used for being triggered to count the times of the intelligent electronic switch entering the over-temperature protection state in an accumulated mode; wherein the time is continuously counted in the first preset time period or before the first preset number is reached; the counting unit is specifically used for triggering counting and adding 1 to the counting; receiving the over-temperature signal again, and continuously adding 1 to the count;
The timing counting judging unit is used for judging whether the number of times of the intelligent electronic switch entering the over-temperature protection state in the first preset time period is larger than or equal to a first preset number;
the second over-temperature control unit is used for controlling the power switch to be kept off if the judgment result of the timing and counting judgment unit is yes, judging that the intelligent electronic switch is in an over-temperature protection state because of capacitive load if the judgment result of the timing and counting judgment unit is no, controlling the power switch to be driven at a preset frequency and a preset duty ratio at the moment, and not triggering the intelligent electronic switch to enter the over-temperature protection state when the power switch is driven at the preset frequency and the preset duty ratio; after the capacitive load drives the power switch through a preset frequency and a preset duty ratio, the capacitive load is not charged to a voltage meeting the requirements, the second overheat control unit or the first overheat control unit drives the power switch, the intelligent electronic switch enters an overheat protection state, then the intelligent electronic switch is triggered to count, the count time in a first preset time period is judged to be smaller than a first preset number, then the power switch is driven through the preset frequency and the preset duty ratio, the steps are repeated in a circulating mode until the capacitive load with an overlarge capacitance value is charged to the voltage meeting the requirements, and then the intelligent electronic switch works normally;
The timing counting judging unit is also used for stopping counting and timing if the timing duration reaches a first preset duration, and setting the count number and the timing duration to zero; or the timing counting judging unit is further used for stopping counting and timing if the timing duration is smaller than the first preset duration and the counting number reaches the first preset number, and the counting number and the timing duration are set to zero.
7. A temperature control circuit of an intelligent electronic switch, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the temperature control method of an intelligent electronic switch according to any one of claims 1 to 5 when executing the computer program.
8. An intelligent electronic switch, comprising a power switch and further comprising a temperature control circuit as claimed in claim 6 or 7.
9. The intelligent electronic switch of claim 8, wherein the intelligent electronic switch is implemented on the same integrated circuit chip; or,
the intelligent electronic switch is characterized in that elements except a power switch and a temperature detection unit are arranged on a first integrated circuit chip, and the power switch and the temperature detection unit are arranged on a second integrated circuit chip.
10. An automobile comprising a temperature control circuit as claimed in claim 6 or 7 or an intelligent electronic switch as claimed in claim 8 or 9;
the intelligent electronic switch is characterized by further comprising a battery and a load, wherein the positive electrode of the battery and the negative electrode of the battery are correspondingly connected with the intelligent electronic switch, and the load is connected with a power switch of the intelligent electronic switch in series.
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| CN201001028Y (en) * | 2006-09-29 | 2008-01-02 | Bcd半导体制造有限公司 | Single chip type switch power source and overtemperature protective circuit thereof |
| CN201830223U (en) * | 2010-10-29 | 2011-05-11 | 山东泰华电讯有限责任公司 | Active and passive combined power switch |
| CN102005731A (en) * | 2010-11-15 | 2011-04-06 | 崇贸科技股份有限公司 | Controller, power converter and method for providing over-temperature protection |
| CN102354958A (en) * | 2011-10-12 | 2012-02-15 | 北京航空航天大学 | Device and method for protecting power switching tube of inverter through software and hardware combination |
| CN104465554A (en) * | 2013-07-23 | 2015-03-25 | 英飞凌科技股份有限公司 | Thermal observer and overload protection for power switches |
| CN104795786A (en) * | 2014-01-20 | 2015-07-22 | 英飞凌科技奥地利有限公司 | Distinguishing between overload and open load in off conditions |
| CN103795383A (en) * | 2014-02-12 | 2014-05-14 | 无锡迈尔斯通集成电路有限公司 | Intelligent switch integrated circuit applied to motorcycle and electrical bicycle |
| CN105790740A (en) * | 2015-01-14 | 2016-07-20 | 英飞凌科技股份有限公司 | Power switch device |
| CN106444890A (en) * | 2016-09-08 | 2017-02-22 | 珠海格力电器股份有限公司 | Power control circuit based on zero crossing detection, power control method, and method for detecting state of temperature control switch |
| CN207612105U (en) * | 2017-12-29 | 2018-07-13 | 惠州市汇宇通电子有限公司 | A kind of electric tool class protection board |
| CN207819428U (en) * | 2018-02-28 | 2018-09-04 | 安福县海能实业股份有限公司 | A kind of short-circuit protection for distinguishing capacitive load |
| CN110445102A (en) * | 2019-08-14 | 2019-11-12 | 上海英恒电子有限公司 | A kind of electronic RELAY devices and guard method |
| CN112467814A (en) * | 2019-09-09 | 2021-03-09 | 宁波拓邦智能控制有限公司 | Battery pack discharge management method and system |
| CN211405851U (en) * | 2020-04-06 | 2020-09-01 | 苏州源特半导体科技有限公司 | Controller of switching power supply converter |
| CN111416512A (en) * | 2020-04-29 | 2020-07-14 | 深圳南云微电子有限公司 | Short circuit judgment and timing control method and circuit |
| CN113644621A (en) * | 2020-05-11 | 2021-11-12 | 上汽通用汽车有限公司 | Automobile circuit protection device, system and method |
| CN115036759A (en) * | 2022-06-14 | 2022-09-09 | 一汽丰田汽车有限公司 | Vehicle charger and over-temperature protection method and device thereof |
| CN115395935A (en) * | 2022-09-23 | 2022-11-25 | 郑州森鹏电子技术股份有限公司 | High-side switch circuit with self-diagnosis function |
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