CN111324156B - Passive device overheating protection method and device and power electronic equipment - Google Patents
Passive device overheating protection method and device and power electronic equipment Download PDFInfo
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- CN111324156B CN111324156B CN202010090656.2A CN202010090656A CN111324156B CN 111324156 B CN111324156 B CN 111324156B CN 202010090656 A CN202010090656 A CN 202010090656A CN 111324156 B CN111324156 B CN 111324156B
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Abstract
The application discloses an overheating protection method and device for a passive device and power electronic equipment, and aims to achieve the overheating protection function of the passive device with low cost. The method comprises the following steps: judging whether the temperature of the active device measured by a temperature measuring circuit of any active device in the power electronic equipment is greater than a first preset value or not, if so, gradually reducing the output power of the power electronic equipment until the temperature of the active device is less than a second preset value, and changing to gradually increasing the output power of the power electronic equipment; the second preset value is less than or equal to A + B and less than or equal to the first preset value, A is the temperature rise of the active device under the full-load condition, and B is the upper limit value of the ring temperature required by the power electronic equipment; and judging whether the temperature of the active device exceeds the first preset value when or before the temperature is increased to the full load, if so, returning to the step of gradually reducing the output power of the power electronic equipment, and if not, maintaining the full load output.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a passive device overheating protection method and device and power electronic equipment.
Background
There are also passive devices as internal Active devices in Power electronic equipment, such as an Active Power Filter (APF), etc., and the Active devices have an overheat protection function, such as an Insulated Gate Bipolar Transistor (IGBT), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), etc., while many passive devices, such as a fuse, a capacitor, a reactor, etc., do not have an overheat protection function in consideration of cost and design complexity.
The actual operation environment of the power electronic equipment is very complicated, when the temperature of the operation environment of the power electronic equipment is too high, the physical parameters of the internal passive devices are prone to drifting or attenuation, the failure rate of the passive devices is increased, and the failure rate of the power electronic equipment is greatly increased.
Disclosure of Invention
In view of this, the invention provides a method and an apparatus for overheat protection of a passive device, and a power electronic device, so as to implement the overheat protection function of the passive device at a lower cost.
A passive device overheating protection method is applied to power electronic equipment, wherein the power electronic equipment internally comprises an active device and a passive device, and the passive device overheating protection method comprises the following steps:
judging whether the temperature of the active device measured by a temperature measuring circuit of any active device in the power electronic equipment is greater than a first preset value or not, if so, gradually reducing the output power of the power electronic equipment until the temperature of the active device is less than a second preset value, and changing to gradually increasing the output power of the power electronic equipment; the second preset value is less than or equal to A + B and less than or equal to the first preset value, A is the temperature rise of the active device under the full-load condition, and B is the upper limit value of the ring temperature required by the power electronic equipment;
and judging whether the temperature of the active device exceeds the first preset value when or before the temperature is increased to the full load, if so, returning to the step of gradually reducing the output power of the power electronic equipment, and if not, maintaining the full load output.
Optionally, in the method for protecting the passive device from overheating, the second preset value < a + B < the first preset value.
Optionally, the step-by-step reduction of the output power of the power electronic device means that the output power of the power electronic device is reduced at a certain rate; the step-by-step increase of the output power of the power electronic equipment refers to increase of the output power of the power electronic equipment at a certain rate;
the increasing and decreasing rates of the output power of the power electronic equipment are dynamically adjusted according to the temperature change rate alpha of the active device, and the increasing rate of the output power of the power electronic equipment is larger when the alpha is larger.
Optionally, when the power electronic device is operated in a grid-connected mode, the fluctuation degree of the power grid is detected, the increasing and decreasing rates of the output power of the power electronic device are dynamically adjusted according to the fluctuation degree of the power grid, and the increasing and decreasing rates of the output power of the power electronic device are larger when the fluctuation degree of the power grid is larger.
Optionally, the step-by-step reduction of the output power of the power electronic device means that the output power of the power electronic device is reduced at a certain rate; the step-by-step increase of the output power of the power electronic equipment refers to increase of the output power of the power electronic equipment at a certain rate;
the rates of increase and decrease of the output power of the power electronic device may be fixed values set in advance.
A passive device overheating protection device is applied to power electronic equipment, wherein the power electronic equipment internally comprises an active device and a passive device, and the passive device overheating protection device comprises:
the acquisition unit is used for acquiring the temperature of any active device in the power electronic equipment, which is measured by the temperature measurement circuit of the active device;
the power adjusting unit is used for judging whether the temperature of the active device is larger than a first preset value or not, if so, gradually reducing the output power of the power electronic equipment until the temperature of the active device is smaller than a second preset value, and then gradually increasing the output power of the power electronic equipment; the second preset value is less than or equal to A + B and less than or equal to the first preset value, A is the temperature rise of the active device under the full-load condition, and B is the upper limit value of the ring temperature required by the power electronic equipment; and judging whether the temperature of the active device exceeds the first preset value when or before the temperature is increased to the full load, if so, returning to the step of gradually reducing the output power of the power electronic equipment, and if not, maintaining the full load output.
Optionally, in the above passive device overheat protection apparatus, the second preset value < a + B < the first preset value.
Optionally, the step of gradually reducing the output power of the power electronic device by the power adjusting unit is to reduce the output power of the power electronic device at a certain rate; the power adjusting unit gradually increases the output power of the power electronic equipment, namely the output power of the power electronic equipment is increased at a certain rate;
the passive device overheating protection device also comprises a parameter adjusting unit; the parameter adjusting unit is used for calculating the temperature change rate alpha of the active device, and dynamically adjusting the increasing and decreasing rates of the output power of the power electronic equipment according to the temperature change rate alpha of the active device, wherein the larger the alpha is, the larger the increasing and decreasing rates of the output power of the power electronic equipment are.
Optionally, the parameter adjusting unit is further configured to detect a power grid fluctuation degree when the power electronic device is in grid-connected operation, dynamically adjust an increasing and decreasing rate of the output power of the power electronic device according to a magnitude of a temperature change rate α of the active device, and dynamically adjust an increasing and decreasing rate of the output power of the power electronic device according to the power grid fluctuation degree, where the larger the power grid fluctuation degree is, the larger the increasing and decreasing rate of the output power of the power electronic device is.
A power electronic device comprising any one of the passive component overheat protection arrangements as disclosed above.
According to the technical scheme, the active device temperature measurement circuit is used for reversely calculating the loop temperature of the power electronic equipment by detecting the temperature of the active device, and the output power of the power electronic equipment is adjusted according to the calculated loop temperature to control the temperature of the passive device, so that the passive device is prevented from running in an overtemperature state, and the purposes of indirectly monitoring and protecting the passive device are achieved. The invention can realize the overheating protection of the passive device only by software development without increasing the hardware cost and changing the hardware design, and has low cost.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 overheat protection of a passive device applied to a power electronic device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a passive device overheat protection device applied to power electronic equipment according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another passive device overheat protection apparatus applied to power electronic equipment according to an embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 1, an embodiment of the present invention discloses a passive device overheat protection method, which is applied to power electronic equipment, and the passive device overheat protection method includes:
step S01: judging whether the temperature of the active device measured by the temperature measuring circuit of any active device in the power electronic equipment is greater than a first preset value or not, and if so, entering step S02; if not, the process returns to step S01.
Step S02: the output power of the power electronic device is gradually reduced, and then the process proceeds to step S03.
Step S03: judging whether the temperature of the active device is smaller than a second preset value or not, if so, entering step S04; if not, the process returns to step S02.
Step S04: the output power of the power electronic device is increased stepwise, and then the flow proceeds to step S04.
Specifically, an active device inside the power electronic device generally has an overheat protection function, and the overheat protection principle is as follows: the temperature of the active device is measured by a temperature measuring circuit of the active device, the temperature generally refers to the shell temperature or the radiator temperature of the active device, the junction temperature of the active device is estimated according to the shell temperature or the radiator temperature, the junction temperature is the temperature of an active device chip (wafer or bare chip), the junction temperature is usually higher than the temperature of an active device packaging shell, and when the junction temperature is too high, certain temperature reduction measures are required to be taken to protect the active device from being damaged. The Temperature measuring circuit generally adopts an NTC (Negative Temperature CoeffiCient) thermistor circuit, and commonly used Temperature acquisition modes such as pressure ring type thermistor Temperature measurement, plug-in type thermistor Temperature measurement, patch type thermistor Temperature measurement and the like. The topological structure of the temperature measuring circuit of the active device belongs to the prior art, and is not described herein again. The following "temperature of the active device" refers to the measured value of the temperature measuring circuit of the active device.
According to the temperature of the active device measured by the temperature measuring circuit of the active device, the temperature rise of the active device can be calculated. The temperature rise of the active device is only related to the output power of the power electronic equipment, and the temperature rise of the active device can be regarded as a fixed value when the output power of the power electronic equipment is fixed. Assuming that the temperature rise of the active device under a full-load condition (full load means that the output power of the power electronic equipment is equal to the rated power) is a, and the upper limit value of the ring temperature required by the power electronic equipment is B, when the power electronic equipment is operated under the full-load condition of the ring temperature B, the temperature of the active device is a + B. And A + B is the upper limit value of the temperature of the active device, and when the temperature of the active device exceeds A + B, the environment temperature of the power electronic equipment is beyond the required environment temperature upper limit value B.
When the temperature of the active device exceeds A + B, namely the ring temperature of the power electronic equipment exceeds the required ring temperature upper limit value B, the output power of the power electronic equipment is gradually reduced, the heat productivity of the power electronic equipment can be reduced, the ring temperature is reduced, and the failure rate of the passive device is further reduced. When the temperature of the active device is reduced to be lower than A + B, namely the ring temperature of the power electronic equipment is reduced to be lower than the required ring temperature upper limit value B, the output power of the power electronic equipment can be gradually increased to restore to full-load operation. In the process of gradually increasing the output power of the power electronic equipment, the heat productivity of the power electronic equipment is increased, the ring temperature is increased, the situation that the temperature of the active device exceeds A + B can occur again, at the moment, the output power of the power electronic equipment needs to be gradually reduced again … …, and the operation of the passive device in an overtemperature state is avoided, so that the purposes of indirectly monitoring and protecting the passive device and enabling the passive device to work in a reasonable temperature range are achieved.
However, the logic control of "lowering the output power of the power electronic device when the temperature of the active device exceeds the threshold a + B, and raising the output power of the power electronic device when the temperature of the active device is lower than the threshold a + B" may cause the power electronic device to frequently perform lowering/raising switching of the output power at the node a + B, which may not only affect the service life of the power electronic device, but also cause the output of the power electronic device to fluctuate back and forth, which may affect the use of the power electronic device. In this regard, in the embodiment of the present invention, it is recommended that an upward adjustment value and a downward adjustment value are set for the threshold a + B, a hysteresis interval including the threshold a + B is formed based on the upward adjustment value and the downward adjustment value, upper and lower limits of the hysteresis interval are respectively recorded as a first preset value and a second preset value, the first preset value is equal to a sum of the threshold a + B and an upward adjustment value, the second preset value is equal to a difference between the threshold a + B and a downward adjustment value, and the upward adjustment value and the downward adjustment value may be equal to or different from each other. That is, embodiments of the present invention allow setting the second preset value ≦ a + B ≦ the first preset value, wherein the second preset value < a + B < the first preset value is preferably set. For example, in a certain application scenario, the second preset value is set to be equal to a + B-15 ℃, and the first preset value is set to be equal to a + B +10 ℃.
Wherein, the step-by-step reduction of the output power of the power electronic device specifically includes: the output power of the power electronic device is reduced at a constant rate, which may be a fixed value set in advance, or may be dynamically adjusted according to the magnitude of the temperature change rate α (α ═ dT/dT, T represents the temperature of the active device, and T represents time) of the active device.
Compared with the rate adopting a fixed value, the embodiment of the present invention recommends dynamically adjusting the rate according to the magnitude of α, because: the embodiment of the invention recommends dynamically adjusting the change rate of the output power of the power electronic equipment according to the change rate of the ring temperature, increasing the change rate of the output power of the power electronic equipment when the change rate of the ring temperature is increased, and reducing the change rate of the output power of the power electronic equipment when the change rate of the ring temperature is decreased. The temperature change rate of the active device is proportional to the temperature change rate alpha of the active device, and the output power change rate of the power electronic equipment is dynamically adjusted according to the temperature change rate alpha of the active device.
Similarly, the step-by-step increase of the output power of the power electronic device specifically includes: the output power of the power electronic device is increased according to a certain rate, which may be a fixed value set in advance, but the embodiment of the present invention preferably dynamically adjusts the rate according to the magnitude of the temperature change rate α of the active device, where the larger α is, the larger rate is.
Step S05: and judging whether the temperature of the active device exceeds the first preset value when the temperature is increased to full load or before the temperature is increased to full load, if so, returning to the step S02, otherwise, entering the step S06.
Step S06: full load output is maintained and the process returns to step S01 to begin the next cycle.
Specifically, the output power of the power electronic equipment cannot be increased without limit, when the output power is increased to full load, if the temperature of the active device does not exceed a first preset value, the full load output is maintained, the cycle of the passive device overheating protection method is ended, and the next cycle is started; when or before the temperature of the active device is increased to the full load, if the temperature of the active device exceeds the first preset value, the output power of the power electronic equipment needs to be gradually reduced again, and the passive device is prevented from operating in an overtemperature state.
As can be seen from the above description, in the embodiments of the present invention, the existing temperature measurement circuit of the active device is utilized, under the conditions of not increasing hardware cost and not changing hardware design, the overheat protection of the passive device is realized by using a software algorithm, the loop temperature of the power electronic device is reversely calculated by detecting the temperature of the active device, and the output power of the power electronic device is adjusted according to the calculated loop temperature to control the temperature of the passive device, so that the passive device is prevented from operating in an overtemperature state, and the purpose of indirectly monitoring and protecting the passive device and enabling the passive device to operate in a reasonable temperature range is realized.
The passive device overheat protection method disclosed by the embodiment of the invention has the following advantages:
1) the failure rate of the equipment caused by overhigh ring temperature is greatly reduced, the service life of the equipment is prolonged, and the after-sale maintenance pressure on the site is reduced;
2) hardware of new equipment and old equipment sold to a customer site is not required to be changed, and the deployment of protection functions can be completed only by upgrading product firmware, so that the on-site hardware transformation is avoided, and the method is convenient and fast.
The power electronic device may be an off-grid operation device or a grid-connected operation device. When the power electronic equipment is grid-connected operation equipment, considering that power grid fluctuation can be caused by output power change of the power electronic equipment, and considering system stability and environment temperature regulation speed, when the change rate of the output power of the power electronic equipment is set, the embodiment of the invention can refer to the temperature change rate alpha of an active device and the power grid fluctuation degree at the same time.
That is to say: as a preferable solution of the embodiment of the present invention, when the power electronic device is in grid-connected operation, the grid fluctuation degree is detected, and the increasing and decreasing rates of the output power of the power electronic device are dynamically adjusted according to the grid fluctuation degree, where the greater the grid fluctuation degree is, the greater the rate is, the smaller the grid fluctuation degree is, and the smaller the rate is.
Corresponding to the above method embodiment, the embodiment of the present invention further discloses a passive device overheat protection device, which is applied to power electronic equipment, where the power electronic equipment includes an active device and a passive device, as shown in fig. 2, the passive device overheat protection device includes an obtaining unit 100 and a power adjusting unit 200, where:
an obtaining unit 100, configured to obtain a temperature of an active device measured by a temperature measuring circuit of any active device in the power electronic device;
the power adjusting unit 200 is configured to determine whether the temperature of the active device is greater than a first preset value, and if so, gradually decrease the output power of the power electronic device until the temperature of the active device is less than a second preset value, and then gradually increase the output power of the power electronic device; the second preset value is less than or equal to A + B and less than or equal to the first preset value, A is the temperature rise of the active device under the full-load condition, and B is the upper limit value of the ring temperature required by the power electronic equipment; and judging whether the temperature of the active device exceeds the first preset value when or before the temperature is increased to the full load, if so, returning to the step of gradually reducing the output power of the power electronic equipment, and if not, maintaining the full load output.
Optionally, in the above-disclosed passive device overheat protection apparatus, the second preset value < a + B < the first preset value.
Optionally, in any one of the above-disclosed passive device overheat protection apparatuses, the power adjusting unit 200 gradually reduces the output power of the power electronic device, that is, reduces the output power of the power electronic device at a certain rate; the power adjusting unit 200 gradually increases the output power of the power electronic device, which means that the output power of the power electronic device is increased at a certain rate;
as shown in fig. 3, the passive device overheat protection apparatus further includes a parameter adjusting unit 300; the parameter adjusting unit 300 is configured to calculate a magnitude of a temperature change rate α of the active device, and dynamically adjust a rate of increasing and decreasing the output power of the power electronic device according to the magnitude of the temperature change rate α of the active device, where the larger the α is, the larger the rate of increasing and decreasing the output power of the power electronic device is.
Optionally, the parameter adjusting unit 300 is further configured to detect a power grid fluctuation degree when the power electronic device is in grid-connected operation, dynamically adjust an increasing and decreasing rate of the output power of the power electronic device according to a temperature change rate α of the active device, and dynamically adjust an increasing and decreasing rate of the output power of the power electronic device according to the power grid fluctuation degree, where the larger the power grid fluctuation degree is, the larger the rate is.
Any passive device overheat protection device disclosed above includes a processor and a memory, the above-mentioned obtaining unit 100, the power adjusting unit 200, the parameter adjusting unit 300, and the like are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to implement corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one kernel can be set, and the overheat protection function of the passive device is realized by adjusting the kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
In addition, the embodiment of the invention also discloses a power electronic device, which comprises: any of the passive device overheat protection arrangements disclosed above.
In summary, the present invention utilizes the existing temperature measurement circuit of the active device to reversely calculate the loop temperature of the power electronic device by detecting the temperature of the active device, and adjusts the output power of the power electronic device according to the calculated loop temperature to control the temperature of the passive device, thereby avoiding the passive device from operating in an over-temperature state, and achieving the purpose of indirectly monitoring and protecting the passive device. The invention can realize the overheating protection of the passive device only by software development without increasing the hardware cost and changing the hardware design, and has low cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are 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.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A passive device overheating protection method is applied to power electronic equipment, wherein the power electronic equipment internally comprises an active device and a passive device, and is characterized by comprising the following steps:
judging whether the temperature of the active device measured by a temperature measuring circuit of any active device in the power electronic equipment is greater than a first preset value or not, if so, gradually reducing the output power of the power electronic equipment until the temperature of the active device is less than a second preset value, and changing to gradually increasing the output power of the power electronic equipment; the second preset value is less than or equal to A + B and less than or equal to the first preset value, A is the temperature rise of the active device under the full-load condition, and B is the upper limit value of the ring temperature required by the power electronic equipment;
and judging whether the temperature of the active device exceeds the first preset value when or before the temperature is increased to the full load, if so, returning to the step of gradually reducing the output power of the power electronic equipment, and if not, maintaining the full load output.
2. The passive device overheating protection method of claim 1, wherein the second predetermined value < a + B < the first predetermined value.
3. A passive device overheat protection method according to claim 1 or 2, wherein:
the step-by-step reduction of the output power of the power electronic equipment is to reduce the output power of the power electronic equipment at a certain rate; the step-by-step increase of the output power of the power electronic equipment refers to increase of the output power of the power electronic equipment at a certain rate;
the increasing and decreasing rates of the output power of the power electronic equipment are dynamically adjusted according to the temperature change rate alpha of the active device, and the increasing rate of the output power of the power electronic equipment is larger when the alpha is larger.
4. The method according to claim 3, wherein when the power electronic device is operated in a grid-connected mode, the power grid fluctuation degree is detected, the increasing and decreasing rate of the output power of the power electronic device is dynamically adjusted according to the power grid fluctuation degree, and the increasing and decreasing rate of the output power of the power electronic device is larger when the power grid fluctuation degree is larger.
5. A passive device overheat protection method according to claim 1 or 2, wherein:
the step-by-step reduction of the output power of the power electronic equipment is to reduce the output power of the power electronic equipment at a certain rate; the step-by-step increase of the output power of the power electronic equipment refers to increase of the output power of the power electronic equipment at a certain rate;
the increasing and reducing rates of the output power of the power electronic equipment are fixed values set in advance.
6. A passive device overheat protection device is applied to power electronic equipment, wherein the power electronic equipment internally comprises an active device and a passive device, and the passive device overheat protection device comprises:
the acquisition unit is used for acquiring the temperature of any active device in the power electronic equipment, which is measured by the temperature measurement circuit of the active device;
the power adjusting unit is used for judging whether the temperature of the active device is larger than a first preset value or not, if so, gradually reducing the output power of the power electronic equipment until the temperature of the active device is smaller than a second preset value, and then gradually increasing the output power of the power electronic equipment; the second preset value is less than or equal to A + B and less than or equal to the first preset value, A is the temperature rise of the active device under the full-load condition, and B is the upper limit value of the ring temperature required by the power electronic equipment; and judging whether the temperature of the active device exceeds the first preset value when or before the temperature is increased to the full load, if so, returning to the step of gradually reducing the output power of the power electronic equipment, and if not, maintaining the full load output.
7. The passive device overheat protection apparatus according to claim 6, wherein the second predetermined value < A + B < the first predetermined value.
8. The passive device overheat protection apparatus according to claim 6 or 7, wherein:
the power adjusting unit gradually reduces the output power of the power electronic equipment, namely reducing the output power of the power electronic equipment at a certain rate; the power adjusting unit gradually increases the output power of the power electronic equipment, namely the output power of the power electronic equipment is increased at a certain rate;
the passive device overheating protection device also comprises a parameter adjusting unit; the parameter adjusting unit is used for calculating the temperature change rate alpha of the active device, and dynamically adjusting the increasing and decreasing rates of the output power of the power electronic equipment according to the temperature change rate alpha of the active device, wherein the larger the alpha is, the larger the increasing and decreasing rates of the output power of the power electronic equipment are.
9. The passive device overheat protection apparatus according to claim 8, wherein the parameter adjusting unit is further configured to detect a grid fluctuation degree during grid-connected operation of the power electronic device, dynamically adjust the increasing and decreasing rates of the output power of the power electronic device according to the magnitude of the temperature change rate α of the active device, and dynamically adjust the increasing and decreasing rates of the output power of the power electronic device according to the grid fluctuation degree, wherein the increasing rate of the grid fluctuation degree increases the increasing rate of the output power of the power electronic device.
10. A power electronic device, comprising: a passive device overheat protection apparatus as claimed in any one of claims 6 to 9.
Priority Applications (1)
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| CN110518550A (en) * | 2019-08-30 | 2019-11-29 | 珠海格力电器股份有限公司 | Power module method for excessive heating protection, computer installation and computer readable storage medium |
| CN209982046U (en) * | 2019-07-29 | 2020-01-21 | 阳光电源股份有限公司 | Overheat protection device and contravariant of relay are incorporated into power networks system |
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| JP2008165769A (en) * | 2006-12-29 | 2008-07-17 | Sato Takayasu | Temperature regulator for electric heater |
| CN102710112A (en) * | 2012-06-12 | 2012-10-03 | 阳光电源股份有限公司 | Overheat protection device and method of inverter |
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