CN109347056B - Low-temperature operation protection method and device for power device - Google Patents
Low-temperature operation protection method and device for power device Download PDFInfo
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- CN109347056B CN109347056B CN201811228331.5A CN201811228331A CN109347056B CN 109347056 B CN109347056 B CN 109347056B CN 201811228331 A CN201811228331 A CN 201811228331A CN 109347056 B CN109347056 B CN 109347056B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
Abstract
The invention provides a low-temperature operation protection method and a low-temperature operation protection device for a power device.A working current threshold value and an overcurrent point value corresponding to a temperature detection value are obtained according to the received temperature detection value of the power device and by combining a preset relation before the power device operates; in the preset relation, the working current threshold value corresponding to each temperature and the voltage peak generated by the overcurrent point value are lower than the withstand voltage value of the power device at the same temperature; therefore, after the current limit value of the power device during normal operation is set as the working current threshold value and the overcurrent protection value of the power device is set as the overcurrent point value, the voltage peak of the power device under the current temperature condition can not exceed the corresponding withstand voltage value, and the power device can be ensured to work safely and reliably; when the temperature changes, the corresponding working current threshold value and the corresponding overcurrent point value also change, and the performance of the power device under various temperature conditions is fully exerted.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a low-temperature operation protection method and device for a power device.
Background
At present, under different temperature conditions, voltage spikes generated by the power device under the same working current are different and present negative temperature characteristics; under the condition of normal temperature, the voltage spikes generated during normal operation and short circuit are small; however, under the condition of low temperature below-10 ℃, the voltage spikes generated during normal operation and short circuit will increase along with the reduction of the temperature.
However, the voltage withstanding level of the power device has a positive temperature characteristic, and therefore, the voltage stress of the power device is easily exceeded under a low temperature condition. If the voltage stress exceeds the standard when the device works under the low-temperature condition, the service life index of the product can be sacrificed, and even the machine can be damaged when the device is short-circuited at low temperature.
In the prior art, the driving of a power device is generally slowed down, so that the curve of a safe working area of the power device is ensured to be met under various working conditions, particularly the voltage-resistant curve of the power device; however, this does not fully utilize the characteristics of the power device, which will sacrifice the efficiency of the power device during normal operation, and increase the product cost and volume.
Disclosure of Invention
The invention provides a low-temperature operation protection method and device for a power device, and aims to solve the problem that the characteristics of the power device are not fully utilized in the prior art.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
a low-temperature operation protection method of a power device comprises the following steps:
receiving a temperature detection value of the power device before the power device operates;
obtaining a working current threshold value and an overcurrent value corresponding to the temperature detection value according to the temperature detection value and a preset relation; the preset relation is a preset corresponding relation between the temperature and the working current threshold value and the overcurrent point value of the power device; in the preset relation, the working current threshold corresponding to each temperature and the voltage peak generated by the overcurrent point value are lower than the withstand voltage value of the power device at the same temperature;
and setting the current limit value of the power device during normal operation as the obtained working current threshold value, and setting the over-current protection value of the power device as the obtained over-current point value.
Preferably, after setting the current limit value when the power device normally operates as the obtained operating current threshold value and setting the overcurrent protection value of the power device as the obtained overcurrent point value, the method further includes:
receiving an operation instruction;
receiving the temperature detection value in real time;
according to the preset relation and the temperature detection value received in real time, updating a working current threshold value and an overcurrent point value corresponding to the temperature detection value;
and adjusting the current limit value of the power device during normal operation to be the updated working current threshold value, and adjusting the over-current protection value of the power device to be the updated over-current point value.
Preferably, the operation instruction is: test instructions, or normal work instructions.
Preferably, the preset relationship includes: a preset first corresponding relation between the temperature and the working current threshold value of the power device, and a preset second corresponding relation between the temperature and the overcurrent point value of the power device;
the first corresponding relation and the second corresponding relation are both piecewise functions, and each function in the piecewise functions is a fixed value function or a linear function.
Preferably, each of the piecewise functions includes at least: a function at a temperature between-40 ℃ and-30 ℃, a function at a temperature between-30 ℃ and-20 ℃, a function at a temperature between-20 ℃ and-10 ℃, and a function at a temperature between-10 ℃ and a high temperature threshold.
Preferably, the receiving the temperature detection value of the power device includes:
receiving a temperature detection value output by a temperature sensor; the temperature sensor is welded on the substrate attached with the power device.
A low temperature operation protection apparatus of a power device, comprising:
the first receiving unit is used for receiving a temperature detection value of the power device before the power device operates;
the table look-up unit is used for obtaining a working current threshold value and an overcurrent value corresponding to the temperature detection value according to the temperature detection value and a preset relation; the preset relation is a preset corresponding relation between the temperature and the working current threshold value and the overcurrent point value of the power device; in the preset relation, the working current threshold corresponding to each temperature and the voltage peak generated by the overcurrent point value are lower than the withstand voltage value of the power device at the same temperature;
and the setting unit is used for setting the current limit value of the power device during normal operation as the obtained working current threshold value and setting the over-current protection value of the power device as the obtained over-current point value.
Preferably, the method further comprises the following steps: the second receiving unit is used for receiving an operation instruction after the setting unit sets the current limit value of the power device in normal operation as the obtained working current threshold value and sets the over-current protection value of the power device as the obtained over-current point value;
the first receiving unit is further configured to: receiving a temperature detection value of the power device after the power device operates;
the table lookup unit is further configured to: after the power device operates, updating a working current threshold value and an overcurrent point value corresponding to the temperature detection value according to the preset relation and the real-time received temperature detection value;
the setting unit is further configured to: after the table look-up unit updates the working current threshold value and the overcurrent point value corresponding to the temperature detection value, the current limit value of the power device in normal operation is adjusted to the updated working current threshold value, and the overcurrent protection value of the power device is adjusted to the updated overcurrent point value.
Preferably, the operation instruction is: test instructions, or normal work instructions.
Preferably, the preset relationship includes: a preset first corresponding relation between the temperature and the working current threshold value of the power device, and a preset second corresponding relation between the temperature and the overcurrent point value of the power device;
the first corresponding relation and the second corresponding relation are both piecewise functions, and each function in the piecewise functions is a fixed value function or a linear function.
Preferably, each of the piecewise functions includes at least: a function at a temperature between-40 ℃ and-30 ℃, a function at a temperature between-30 ℃ and-20 ℃, a function at a temperature between-20 ℃ and-10 ℃, and a function at a temperature between-10 ℃ and a high temperature threshold.
Preferably, when the first receiving unit is configured to receive a temperature detection value of the power device, the first receiving unit is specifically configured to:
receiving a temperature detection value output by a temperature sensor; the temperature sensor is welded on the substrate attached with the power device.
Before the power device operates, the low-temperature operation protection method of the power device obtains a working current threshold value and an overcurrent value corresponding to a temperature detection value according to the received temperature detection value of the power device and by combining the preset relation between the temperature detection value and the working current threshold value and the overcurrent value; in the preset relation, the working current threshold value corresponding to each temperature and the voltage peak generated by the overcurrent point value are lower than the withstand voltage value of the power device at the same temperature; therefore, after the current limit value of the power device during normal operation is set as the obtained working current threshold value and the overcurrent protection value of the power device is set as the obtained overcurrent point value, the voltage peak of the power device under the current temperature condition can not exceed the corresponding withstand voltage value, and the power device can work safely and reliably; and when the temperature changes, the corresponding working current threshold value and the corresponding overcurrent point value also change, so that the protection of the power device is more effective, more timely and more reliable, the performance of the power device under various temperature conditions can be fully exerted, and the efficiency of the system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for protecting a low temperature operation of a power device according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for protecting a low temperature operation of a power device according to another embodiment of the present invention;
fig. 3a and 3b are waveform diagrams illustrating preset relationships in a low temperature operation protection method for a power device according to another embodiment of the present invention;
FIG. 4 is a partial flow diagram of a method for protecting a power device from low temperature operation according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a low-temperature operation protection apparatus for a power device according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides a low-temperature operation protection method of a power device, which aims to solve the problem that the characteristics of the power device are not fully utilized in the prior art.
Specifically, referring to fig. 1, the method for protecting low-temperature operation of the power device includes:
s101, receiving a temperature detection value of a power device before the power device operates;
because the junction temperature of the power device can more accurately represent the temperature of the power device, in practical application, the temperature sensor can detect the junction temperature of the power device and then generate a temperature detection value. When all the power devices are attached to the aluminum substrate, the temperature sensor may be welded to the aluminum substrate, such as an NTC (Negative temperature coefficient) temperature sensor or a PTC (Positive temperature coefficient) temperature sensor (not limited to the two, which are both within the protection range of the present application depending on the specific application environment); the actual processing manner is similar to the copper substrate processing manner of an Insulated Gate Bipolar Transistor (IGBT) module, and is not described herein again.
S102, obtaining a working current threshold value and an overcurrent value corresponding to the temperature detection value according to the temperature detection value and a preset relation;
the preset relationship is as follows: the preset corresponding relation among the temperature, the working current threshold value and the overcurrent point value of the power device is obtained; therefore, the working current threshold value and the over-current point value corresponding to the temperature with the same value as the current temperature detection value can be found from the preset relation; according to the difference of the current temperature detection values, working current threshold values and over-current point values corresponding to different temperatures can be found.
In the preset relation, the working current threshold corresponding to each temperature and the voltage peak generated by the overcurrent point value are lower than the withstand voltage value of the power device at the same temperature; therefore, if the working current threshold value corresponding to the current temperature detection value is used as the current limit value when the power device normally works and the over-current point value corresponding to the current temperature detection value is used as the over-current protection value of the power device, it can be ensured that the voltage spike of the power device during normal work and over-current is lower than the withstand voltage value of the power device at the current temperature.
S103, setting the current limit value of the power device during normal operation as the obtained working current threshold value, and setting the over-current protection value of the power device as the obtained over-current point value.
The current limit value and the overcurrent protection value of the power device during normal operation are designed into a configurable scheme which follows temperature change, so that the turn-off peak voltage value of the power device is below the withstand voltage of the power device at the corresponding temperature even under the low-temperature condition, and the power device can safely and reliably operate under various temperature conditions.
The low-temperature operation protection method for the power device provided by the embodiment can not only ensure that the voltage peak of the power device under the current temperature condition does not exceed the corresponding withstand voltage value, but also ensure that the power device can work safely and reliably; and when the temperature changes, the corresponding working current threshold value and the corresponding overcurrent point value also change along with the change, so that the current limit value and the overcurrent protection value of the power device during normal working also change along with the change, further the protection of the power device is more effective, more timely and more reliable, meanwhile, the performance of the power device under various temperature conditions can be fully exerted, the efficiency of a system is improved, and the product cost and the product volume are reduced.
Another embodiment of the present invention further provides another method for protecting low-temperature operation of a power device, referring to fig. 2, based on the above embodiment and fig. 1, after step S103, the method further includes:
s201, receiving an operation instruction;
the operation instruction is an instruction capable of causing the power device to enter an operation state; specifically, the operation instruction may be a test instruction for tentative fault detection, such as a short-circuit instruction for controlling a short circuit of a circuit where the power device is located; or, the operation instruction may also be a normal operation instruction in a normal operation state, such as an accelerator signal issued by a vehicle control unit in the field of electric vehicle control; it is not specifically limited herein, and is within the scope of the present application depending on the application environment.
In practical application, in order to improve the application safety of the power device, a test instruction may be received before a normal operation instruction is received; no matter the received operation instruction is a test instruction or a normal operation instruction, the step S202 is executed after the power device is operated;
s202, receiving a temperature detection value in real time;
s203, updating a working current threshold value and an overcurrent point value corresponding to the temperature detection value according to the preset relation and the real-time received temperature detection value;
s204, adjusting the current limit value of the power device during normal operation to be an updated working current threshold value, and adjusting the over-current protection value of the power device to be an updated over-current point value;
it should be noted that steps S202 to S204 may be continuously executed, or may also be executed according to respective cycles, or step S202 may be continuously executed, and steps S203 and S204 are sequentially executed according to the same cycle, which is not specifically limited herein, and is within the protection scope of the present application depending on the application environment. And, if the operation instruction received in step S201 is a test instruction, after some or all of steps S202 to S204 are executed, even after steps S202 to S204 have been executed a plurality of times, once a normal operation instruction is received, it will be put into steps S202 to S204 again. In practical application, the corresponding execution cycles of the subsequent steps triggered by the test instruction and the normal working instruction can be different, and the respective execution cycles can be set by themselves and are within the protection scope of the application.
Setting of a current limit value and an overcurrent protection value when the power device normally works can be completed through the steps S101 to S103, and jumping to an operation program through the step S201; this means that, before the run sequence is started, its current limit and overcurrent protection value have been adjusted to the current temperature conditions according to the temperature. Moreover, after the power device operates, the temperature of the power device rises, and therefore, the current limit value and the overcurrent protection value during normal operation need to be adjusted in real time along with the temperature rise through steps S202 to S204, so that the subsequent operation of the system can be performed normally and cannot be limited by the adjustment result before the operation, the performance of the power device under various temperature conditions can be fully exerted, and the efficiency of the system is improved; and, from the actual product operation perspective, also do not influence customer's impression.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
Another embodiment of the present invention further provides another method for protecting low-temperature operation of a power device, based on the above embodiment and fig. 1 and fig. 2, preferably, the preset relationship includes: a preset first corresponding relation between the temperature and the working current threshold value of the power device, and a preset second corresponding relation between the temperature and the overcurrent point value of the power device;
the first corresponding relation and the second corresponding relation are both piecewise functions, and each function in the piecewise functions is a constant value function or a linear function; as shown in fig. 3a, each of the piecewise functions is a constant value function; as shown in fig. 3b, three functions of the piecewise function are all linear functions, and the other function is a constant value function.
Specifically, as shown in fig. 3a and 3b, each of the piecewise functions at least includes: a function at a temperature T between-40 ℃ and-30 ℃, a function at a temperature T between-30 ℃ and-20 ℃, a function at a temperature T between-20 ℃ and-10 ℃, and a function at a temperature T between-10 ℃ and a high temperature threshold (e.g., 85 ℃). The operating current threshold and the overcurrent point values for the respective functions can be set as illustrated In either of fig. 3a and 3b, but the specific current values In (In a) are set differently. It should be noted that, after the temperature exceeds the high temperature threshold, other specific function settings may be performed according to the positive temperature characteristic of the voltage withstanding level of the power device and other limiting conditions, which are not specifically limited herein, and any scheme that timely adjusts the current limit value and the overcurrent protection value when the power device normally operates according to the temperature detection to ensure the safety and reliability of the power device during low temperature operation is within the protection scope of the present application.
That is, an operating current threshold and an overcurrent value are respectively set for the temperature range of-40 ℃ to-30 ℃, an operating current threshold and an overcurrent value are respectively set for the temperature range of-30 ℃ to-20 ℃, an operating current threshold and an overcurrent value are respectively set for the temperature range of-20 ℃ to-10 ℃, and an operating current threshold and an overcurrent value are respectively set for the temperature range of-10 ℃ and a high temperature threshold. Different working current threshold values and overcurrent point values are set according to different temperatures, so that the current limit value and the overcurrent protection value of the power device during normal working change along with the temperature, and the protection of the power device is more effective, timely and reliable.
Before the method is applied, the junction temperature of the power device is required to be selected to be-40 ℃, 30 ℃, 20 ℃, 10 ℃, 0 ℃, 25 ℃, 85 ℃ and the like, the current limit value and the overcurrent protection value during normal operation, which are allowed when the voltage peak does not exceed the standard, are met under the temperature conditions of the power device, the function between the current limit value and the overcurrent protection value is defined in advance, the relation between the current limit value and the overcurrent protection value is established, and the working current threshold value and the overcurrent protection value are set through software.
Then, when the method is applied, step S102 may be as shown in fig. 4, and specifically includes:
judging whether the temperature detection value T is lower than a first temperature value T1 (such as-30 ℃), if so, searching a corresponding working current threshold value and an overcurrent value when the temperature detection value T is lower than the first temperature value T1 from the preset relation;
if the temperature detection value T is not lower than the first temperature value T1, judging whether the temperature detection value T is between the front-close and rear-open temperature intervals of a first temperature value T1 (such as-30 ℃) and a second temperature value T2 (such as-20 ℃); if so, searching the working current threshold value and the overcurrent point value corresponding to the temperature interval from the preset relation;
if the temperature detection value is not between the first temperature value T1 and the second temperature value T2, determining whether the temperature detection value is between the front-closed and rear-open temperature intervals of the second temperature value T2 (such as-20 ℃) and the third temperature value T3 (such as-10 ℃); if so, searching the working current threshold value and the overcurrent point value corresponding to the temperature interval from the preset relation;
if the temperature detection value is not between the second temperature value T2 and the third temperature value T3, determining whether the temperature detection value is between the front-closed and rear-open temperature intervals of the third temperature value T3 (such as-10 ℃) and the fourth temperature value T4 (such as 85 ℃); if yes, the working current threshold value and the overcurrent point value corresponding to the temperature interval are searched from the preset relation.
In practical applications, the specific implementation process of step S102 is not limited to this, and may be in other manners; in addition, the temperature interval may be divided into other forms, and the specific implementation process of step S102 will also change correspondingly, and fig. 4 is only an example, and is within the protection scope of the present application depending on the application environment.
Then, in step S103, based on the preset relationship, even under low temperature conditions, the voltage spike can be ensured to meet the usage requirement under short circuit and normal operation conditions.
In addition, the current limit value set by the working current threshold value when the power device normally works and the overcurrent protection value set by the overcurrent point value are dynamically adjusted according to the actual temperature in the operation process, so that the performance of the power device under various temperature conditions is fully exerted, and the efficiency of the system is improved.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
Another embodiment of the present invention further provides a low temperature operation protection apparatus for a power device, as shown in fig. 5, including: a first receiving unit 101, a table look-up unit 102 and a setting unit 103; wherein:
the first receiving unit 101 is used for receiving a temperature detection value of the power device before the power device operates;
the table look-up unit 102 is configured to obtain a working current threshold value and an overcurrent value corresponding to the temperature detection value according to the temperature detection value and a preset relationship; the preset relation is a preset corresponding relation between the temperature and the working current threshold value and the overcurrent point value of the power device; in a preset relation, the working current threshold value corresponding to each temperature and a voltage peak generated by an overcurrent point value are lower than the withstand voltage value of the power device at the same temperature;
the setting unit 103 is configured to set a current limit value of the power device during normal operation as an obtained operating current threshold value, and set an overcurrent protection value of the power device as an obtained overcurrent point value.
The low-temperature operation protection device provided by the embodiment sets different overcurrent protection values and current limit values during normal operation according to different temperatures of the power device, so that voltage spikes generated by the power device under a short-circuit working condition and during normal operation are lower than the withstand voltage value of the power device, and the use safety of the power device is ensured.
Preferably, the method further comprises the following steps: the second receiving unit is used for receiving an operation instruction after the setting unit 103 sets the current limit value of the power device in normal operation as the obtained working current threshold value and sets the over-current protection value of the power device as the obtained over-current point value; preferably, the operation instruction is: test instructions, or normal work instructions.
In practical applications, the second receiving unit may be a communication module, which is not limited herein and is within the scope of the present application depending on the specific application environment.
At this time, the first receiving unit 101 is further configured to: receiving a temperature detection value of the power device after the power device operates;
the table lookup unit 102 is further configured to: after the power device operates, updating a working current threshold value and an overcurrent point value corresponding to a temperature detection value according to a preset relation and the real-time received temperature detection value;
the setting unit 103 is further configured to: after the table look-up unit 102 updates the operating current threshold and the over-current point value corresponding to the temperature detection value, the current limit value when the power device normally operates is adjusted to the updated operating current threshold, and the over-current protection value of the power device is adjusted to the updated over-current point value.
Preferably, the preset relationship includes: a preset first corresponding relation between the temperature and the working current threshold value of the power device, and a preset second corresponding relation between the temperature and the overcurrent point value of the power device;
the first corresponding relation and the second corresponding relation are both piecewise functions, and each function in the piecewise functions is a constant value function or a linear function.
Optionally, each of the piecewise functions at least includes: a function at a temperature T between-40 ℃ and-30 ℃, a function at a temperature T between-30 ℃ and-20 ℃, a function at a temperature T between-20 ℃ and-10 ℃, and a function at a temperature T between-10 ℃ and a high temperature threshold (e.g., 85 ℃).
Preferably, when the first receiving unit 101 is configured to receive the temperature detection value of the power device, it is specifically configured to:
receiving a temperature detection value output by a temperature sensor; the temperature sensor is welded on the substrate attached with the power device.
The specific principle is the same as the above embodiments, and is not described in detail here.
The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (12)
1. A low-temperature operation protection method of a power device is characterized by comprising the following steps:
receiving a temperature detection value of the power device before the power device operates;
obtaining a working current threshold value and an overcurrent value corresponding to the temperature detection value according to the temperature detection value and a preset relation; the preset relation is a preset corresponding relation between the temperature and the working current threshold value and the overcurrent point value of the power device; in the preset relation, the working current threshold corresponding to each temperature and the voltage peak generated by the overcurrent point value are lower than the withstand voltage value of the power device at the same temperature;
the current limit value of the power device during normal operation is set as the obtained working current threshold value, and the overcurrent protection value of the power device is set as the obtained overcurrent value, so that under the condition of low temperature, under the conditions of short circuit and normal operation, the voltage peak can be ensured to meet the use requirement of the power device.
2. The method for protecting low-temperature operation of a power device according to claim 1, wherein after setting the current limit value of the power device during normal operation as the obtained operating current threshold value and setting the over-current protection value of the power device as the obtained over-current point value, the method further comprises:
receiving an operation instruction;
receiving the temperature detection value in real time;
according to the preset relation and the temperature detection value received in real time, updating a working current threshold value and an overcurrent point value corresponding to the temperature detection value;
and adjusting the current limit value of the power device during normal operation to be the updated working current threshold value, and adjusting the over-current protection value of the power device to be the updated over-current point value.
3. The method for protecting low-temperature operation of a power device according to claim 2, wherein the operation instruction is: test instructions, or normal work instructions.
4. The method for protecting low temperature operation of a power device according to any one of claims 1 to 3, wherein the predetermined relationship comprises: a preset first corresponding relation between the temperature and the working current threshold value of the power device, and a preset second corresponding relation between the temperature and the overcurrent point value of the power device;
the first corresponding relation and the second corresponding relation are both piecewise functions, and each function in the piecewise functions is a fixed value function or a linear function.
5. The method of claim 4, wherein each of the piecewise functions includes at least: a function at a temperature between-40 ℃ and-30 ℃, a function at a temperature between-30 ℃ and-20 ℃, a function at a temperature between-20 ℃ and-10 ℃, and a function at a temperature between-10 ℃ and a high temperature threshold.
6. The method for protecting low-temperature operation of a power device according to any one of claims 1 to 3, wherein receiving the temperature detection value of the power device comprises:
receiving a temperature detection value output by a temperature sensor; the temperature sensor is welded on the substrate attached with the power device.
7. A low-temperature operation protection device of a power device is characterized by comprising:
the first receiving unit is used for receiving a temperature detection value of the power device before the power device operates;
the table look-up unit is used for obtaining a working current threshold value and an overcurrent value corresponding to the temperature detection value according to the temperature detection value and a preset relation; the preset relation is a preset corresponding relation between the temperature and the working current threshold value and the overcurrent point value of the power device; in the preset relation, the working current threshold corresponding to each temperature and the voltage peak generated by the overcurrent point value are lower than the withstand voltage value of the power device at the same temperature;
and the setting unit is used for setting the current limit value of the power device during normal operation as the obtained working current threshold value and setting the over-current protection value of the power device as the obtained over-current point value.
8. The device for protecting low temperature operation of a power device according to claim 7, further comprising: the second receiving unit is used for receiving an operation instruction after the setting unit sets the current limit value of the power device in normal operation as the obtained working current threshold value and sets the over-current protection value of the power device as the obtained over-current point value;
the first receiving unit is further configured to: receiving a temperature detection value of the power device after the power device operates;
the table lookup unit is further configured to: after the power device operates, updating a working current threshold value and an overcurrent point value corresponding to the temperature detection value according to the preset relation and the real-time received temperature detection value;
the setting unit is further configured to: after the table look-up unit updates the working current threshold value and the overcurrent point value corresponding to the temperature detection value, the current limit value of the power device in normal operation is adjusted to the updated working current threshold value, and the overcurrent protection value of the power device is adjusted to the updated overcurrent point value.
9. The device according to claim 8, wherein the operation command is: test instructions, or normal work instructions.
10. The device according to any of claims 7-9, wherein the predetermined relationship comprises: a preset first corresponding relation between the temperature and the working current threshold value of the power device, and a preset second corresponding relation between the temperature and the overcurrent point value of the power device;
the first corresponding relation and the second corresponding relation are both piecewise functions, and each function in the piecewise functions is a fixed value function or a linear function.
11. The device of claim 10, wherein each of the piecewise functions includes at least: a function at a temperature between-40 ℃ and-30 ℃, a function at a temperature between-30 ℃ and-20 ℃, a function at a temperature between-20 ℃ and-10 ℃, and a function at a temperature between-10 ℃ and a high temperature threshold.
12. The device according to any one of claims 7 to 9, wherein the first receiving unit is configured to, when receiving the temperature detection value of the power device, specifically:
receiving a temperature detection value output by a temperature sensor; the temperature sensor is welded on the substrate attached with the power device.
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| CN110518550B (en) * | 2019-08-30 | 2021-04-27 | 珠海格力电器股份有限公司 | Power module overheating protection method, computer device and computer readable storage medium |
| CN111681622A (en) * | 2020-06-05 | 2020-09-18 | Tcl华星光电技术有限公司 | Level shifter for liquid crystal display panel and trigger current value adjusting method thereof |
| CN117080998A (en) * | 2020-06-30 | 2023-11-17 | 华为技术有限公司 | Voltage regulating device and overcurrent protection method |
| CN111798809A (en) * | 2020-07-09 | 2020-10-20 | Tcl华星光电技术有限公司 | Display device and display apparatus |
| CN114336499B (en) * | 2021-11-25 | 2023-09-15 | 河南嘉晨智能控制股份有限公司 | Scheme for adaptively adjusting overcurrent protection point |
| CN114967788A (en) * | 2022-05-27 | 2022-08-30 | 安徽华米信息科技有限公司 | Electronic equipment control method and related device |
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| CN106762587B (en) * | 2017-01-06 | 2018-08-17 | 广东美的制冷设备有限公司 | The adjusting method of compressor rotary speed, device and air conditioner under low temperature |
| CN108808755A (en) * | 2017-05-03 | 2018-11-13 | 江阴信邦电子有限公司 | The overheat protector system of charging unit |
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