CN117613809A - Method and device for preventing power device from overcurrent control - Google Patents
Method and device for preventing power device from overcurrent control Download PDFInfo
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- CN117613809A CN117613809A CN202311288926.0A CN202311288926A CN117613809A CN 117613809 A CN117613809 A CN 117613809A CN 202311288926 A CN202311288926 A CN 202311288926A CN 117613809 A CN117613809 A CN 117613809A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000005669 field effect Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- H02H3/08—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 responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The method only sets one temperature sensor, obtains junction temperatures of a plurality of power devices according to a temperature-junction temperature function fitted in advance, monitors operation current and bus current of the power devices, and obtains a maximum allowable operation current threshold of the power devices according to the junction temperatures and a parameter table, so that peak current of the power devices under instantaneous working conditions is accurately mastered, instantaneous heavy current protection is carried out, long-time heavy current protection is carried out, load stop operation is timely controlled, hardware is prevented from being burnt due to the fact that the operation current of the power devices exceeds the maximum allowable operation current threshold, overcurrent load is calculated, influence of the heavy bus current on the hardware is avoided, the power devices are protected from being damaged due to overcurrent, and reliability of a system is improved.
Description
Technical Field
The application relates to the technical field of electronic devices, in particular to an overcurrent control method and device for a power device.
Background
In electrical systems, such as motor control systems, power devices are typically used for control, but the overload resistance of the power devices is typically low and the power devices are prone to overload damage.
In the prior art, the power device is controlled to be closed according to the current value flowing through the power device as a protection basis, and a fixed value is generally adopted as a limit value of the maximum current, but the maximum current allowed to pass through the power device can change along with the temperature change of the power device, so that the control precision of the power device is not high enough depending on the fixed current value flowing through the power device, and untimely protection or over-protection is easy to occur, so that the system cannot normally and stably operate, and the power device is aged prematurely and even damaged.
Disclosure of Invention
The application provides an overcurrent control method and device for power devices, which realize overcurrent control of a plurality of power devices by setting a single temperature sensor, avoid overcurrent damage to the power devices and ensure normal and stable operation of a system.
In a first aspect, the present application provides an overcurrent control method for a power device, where a plurality of power devices, a temperature sensor, and a controller are all mounted on a PCB, and the plurality of power devices, the current sensor, the temperature sensor, and a load are all electrically connected to the controller, and the plurality of power devices are all electrically connected to the load;
the power device overcurrent control method comprises the following steps:
after the load operates, the current sensor monitors the operating current I1 and the bus current Irms of the power devices in real time, the temperature sensor monitors the temperature of the position of the temperature sensor in real time, and the operating current I1, the bus current Irms and the temperature are transmitted to the controller;
the controller obtains a plurality of junction temperatures corresponding to the power devices respectively according to the temperature and a preset temperature-junction temperature function;
the controller obtains maximum allowable working current threshold I2 of a plurality of power devices corresponding to the junction temperatures according to the junction temperatures and the parameter tables; the parameter table is a corresponding relation table of a plurality of junction temperatures of the power device and a plurality of maximum allowable working current threshold values I2;
the controller controls the load to stop running according to the running current I1, the maximum allowable running current threshold I2 and the duration time of the running current I1,
and/or the controller controls the load to stop running according to the sizes of the overcurrent load U1 and the maximum allowable load Umax and the duration time of the overcurrent load U1.
In some embodiments of the present application, based on the foregoing scheme, before the step of controlling the load to stop running according to the magnitudes of the overload load U1 and the maximum allowable load Umax and the duration of the overload load U1 by the controller, the controller is configured to perform the following steps according to the formula
Determining an overcurrent load U1; wherein Ic is a preset continuous current limiting value, ts is execution time in the controller, and t is integration times.
In some embodiments of the present application, based on the foregoing solution, the controller controls the load to stop operating according to the magnitudes of the operating current I1 and the maximum allowable operating current threshold I2 and the duration of the operating current I1, including:
if I1 is larger than I2 and the duration is longer than T1, T1 is a first preset value, the controller controls the load to stop running.
In some embodiments of the present application, based on the foregoing solutions, the controller controls the load to stop running according to the magnitudes of the overload load U1 and the maximum allowable load Umax and the duration of the overload load U1, including:
if U1 is larger than Umax and the duration is longer than T2, T2 is a second preset value, the controller controls the load to stop running.
In some embodiments of the present application, the power device comprises a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor based on the foregoing scheme.
In some embodiments of the present application, based on the foregoing scheme, the temperature sensor is disposed at one side of the plurality of power devices.
In some embodiments of the present application, based on the foregoing solution, before the step of obtaining, by the controller, a plurality of junction temperatures corresponding to the plurality of power devices according to the temperature and a preset temperature-junction temperature function, fitting the preset temperature-junction temperature function, where a fitting method of the preset temperature-junction temperature function is: for each power device, before the power device is mounted on a PCB, a temperature sensor is arranged at the mounting position of the power device, so that the junction temperature of the power device is obtained, a plurality of discrete points containing the temperature and the junction temperature are obtained, and fitting is carried out on the plurality of discrete points containing the temperature and the junction temperature, so that the deviation between the temperature and the junction temperature is minimum, and a preset temperature-junction temperature function is obtained.
In some embodiments of the present application, based on the foregoing solutions, the controller obtains, by interpolation, a maximum allowable operating current threshold I2 of a plurality of power devices corresponding to a plurality of junction temperatures, respectively, according to a plurality of junction temperatures and parameter tables.
In some embodiments of the present application, the interpolation method includes a nearest neighbor interpolation method or a linear interpolation method based on the foregoing scheme.
In a second aspect, the present application provides an anti-overcurrent control device for a power device, including a PCB board, a plurality of power devices, a current sensor, a temperature sensor, and a controller, where the plurality of power devices, the temperature sensor, and the controller are all mounted on the PCB board, and the plurality of power devices, the current sensor, the temperature sensor, and the load are all electrically connected to the controller, and the plurality of power devices are all electrically connected to the load;
the current sensor is used for monitoring the running currents I1 and the bus currents Irms of the power devices in real time after the load runs, and the temperature sensor is used for monitoring the temperature of the position of the temperature sensor in real time after the load runs;
the controller is used for obtaining a plurality of junction temperatures corresponding to the power devices respectively according to the temperature and a preset temperature-junction temperature function;
the controller is also used for obtaining maximum allowable working current threshold I2 of the power devices corresponding to the junction temperatures according to the junction temperatures and the parameter tables; the parameter table is a corresponding relation table of a plurality of junction temperatures of the power device and a plurality of maximum allowable working current threshold values I2;
the controller is also used for controlling the load to stop running according to the running current I1, the maximum allowable working current threshold I2 and the duration time of the running current I1;
the controller is also used for controlling the load to stop running according to the sizes of the overcurrent load U1 and the maximum allowable load Umax and the duration time of the overcurrent load U1.
According to the technical scheme, the method is provided with only one temperature sensor, junction temperatures of a plurality of power devices are obtained according to a temperature-junction temperature function fitted in advance, and the junction temperatures of the power devices in a working state can be detected by only arranging one temperature sensor. The operation current and bus current of the power device are monitored, and the maximum allowable working current threshold of the power device is obtained according to the junction temperature and the parameter table, so that the peak current of the power device under the instantaneous working condition is accurately mastered, the instantaneous heavy current protection is performed, the long-time heavy current protection is performed, the load is timely controlled to stop operation, the condition that the hardware is burnt out due to the fact that the operation current of the power device exceeds the maximum allowable working current threshold is avoided, the overcurrent load is calculated, the influence of the large bus current on the hardware is avoided, the power device is further protected from being damaged due to overcurrent, and the reliability of the system is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 is a flow chart of an anti-over-current control method of a power device of the present application;
FIG. 2 is a schematic block diagram of a circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an anti-overcurrent control device of the power device.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. 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.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, the present application provides an anti-overcurrent control method for a power device, in which a plurality of power devices 20, a temperature sensor 30, and a controller 40 are all mounted on a PCB (Printed Circuit Board ) board 10, the plurality of power devices 20, a current sensor (not shown), the temperature sensor 30, and a load 50 are all electrically connected to the controller 40, and the plurality of power devices 20 are all electrically connected to the load 50;
the power device overcurrent control method comprises the following steps:
step S1, after the load 50 operates, the current sensor monitors the operating current I1 and the bus current Irms of the power devices 20 in real time, the temperature sensor 30 monitors the temperature C1 of the position of the temperature sensor 30 in real time, and transmits the operating current I1, the bus current Irms and the temperature C1 to the controller 40;
step S2, the controller 40 obtains a plurality of junction temperatures C2 corresponding to the power devices 20 according to the temperature C1 and a preset temperature-junction temperature function;
step S3, the controller 40 obtains maximum allowable working current threshold I2 of the power devices 20 corresponding to the junction temperatures C2 according to the junction temperatures C2 and the parameter table; the parameter table is a corresponding relation table of a plurality of junction temperatures C2 and a plurality of maximum allowable working current threshold values I2 of the power device 20;
in step S4, the controller 40 controls the load 50 to stop operating according to the operating current I1 and the maximum allowable operating current threshold I2 and the duration of the operating current I1,
and/or, the controller 40 controls the load 50 to stop running according to the magnitudes of the overcurrent load U1 and the maximum allowable load Umax and the duration of the overcurrent load U1.
In some embodiments, step S4 specifically includes:
instantaneous heavy current protection: if I1 is greater than I2 and the duration is greater than T1, T1 is a first preset value, the controller 40 controls the load 50 to stop running, so that the power device 20 is protected from overcurrent damage, and the reliability of the equipment is improved;
protection from large currents for long periods: if U1 is larger than Umax and the duration is longer than T2, the controller 40 controls the load 50 to stop running, so that the power device 20 is protected from overcurrent damage, and the reliability of equipment is improved; wherein T2 is a second preset value,
u1 is an overcurrent load (current load), i.e. a load calculated under different bus currents, umax is a maximum allowable load (a fixed value, e.g. 2000, determined according to hardware characteristics), ic is a preset continuous current limit value (e.g. 30A, determined according to hardware characteristics), ts is an execution time (interrupt time) in the controller 40, and t is an integration number or time.
The first preset value T1 and the second preset value T2 may be calibrated, for example, T1 is 2 μs and T2 is 2 μs.
Specifically, the method for preventing the power device from being excessively controlled in the embodiment can be used for a motor control system, the PCB board 10 is a motor controller board of the motor control system, the controller 40 includes a single-chip microcomputer, and the load 50 is a three-phase motor. The controller 40 drives the load 50 by controlling the switching of the plurality of power devices 20 to generate controllable three-phase currents.
In some embodiments, power device 20 includes a MOS (metal oxide semiconductor, metal oxide semiconductor field effect transistor) or an IGBT (Insulated Gate Bipolar Transistor ).
Referring to fig. 2, in fig. 2, six power devices 20 are provided, each power device 20 includes a MOS transistor T and a diode D, that is, the six power devices 20 are respectively T1 and D1, T2 and D2, T3 and D3, T4 and D4, T5 and D5, T6 and D6, and a controllable three-phase current is generated to drive the three-phase motor 50 through on-off of the six power devices 20.
According to the structural layout (layout) of the PCB board 10, the temperature sensor 30 is disposed on one side of the power device 20, and only the temperature C1 at the position of the temperature sensor 30 can be obtained by the temperature sensor 30, but since the positions of the temperature sensor 30 and the power devices 20 are different, the junction temperature C2 of each power device 20 cannot be obtained directly according to the temperature C1, so that a function between the temperature C1 of the temperature sensor 30 and the junction temperature C2 of each power device 20, that is, a preset temperature-junction temperature function, needs to be fitted in advance, and the fitting method is as follows:
for each power device 20, before the power device 20 is mounted on the PCB board 10, a temperature sensor is disposed at a mounting position of the power device 20, so as to obtain a junction temperature C2 of the power device 20, obtain a plurality of discrete points including a temperature C1 and the junction temperature C2, and fit the plurality of discrete points including the temperature C1 and the junction temperature C2, for example, fit a curve fitting tool (Curve fitting Tool) using MATLAB software, so that a deviation between the temperature C1 and the junction temperature C2 is minimum, and obtain a fitted curve, that is, a preset temperature-junction temperature function. Therefore, when the power devices 20 are installed, the temperature sensor at the installation position is removed, and after the power devices 20 are installed, the junction temperature C2 of each power device 20 is reflected according to a temperature-junction temperature function fitted in advance through the temperature C1 of the temperature sensor 30. For the plurality of power devices 20, the distances between the power devices 20 and the temperature sensor 30 are different, and a plurality of temperature-junction temperature functions corresponding to the plurality of power devices 20 are finally obtained through fitting, so that junction temperatures C2 of the plurality of power devices 20 are respectively obtained according to the temperature C1 of the same temperature sensor 30.
Taking as an example fitting one of the power devices 20:
Δx1 (j) =x (j) -x (j-1), Δy1 (j) =y (j) -y (j-1), and temperature x1=c1= [ C2 ] of the temperature sensor 30 1 c2 2 c2 3 …c2 n ]＝[c2 1 c2 2 c2 3 …c2 (j-1) c2 j c2 (j+1) …c2 n ]，x(j)＝c2 j Junction temperature y1=c2= [ c1c2c3 … cn of the power device 20]＝[c1 c2 c3…c(j-1)cj c(j+1)…cn]Y (j) =cj; the length of the broken line of the adjacent discrete points isWherein n is the number of discrete points, and the junction temperature of the power device 20 at time t is C2 t S1 (0) =0; obtaining a parameter equation x1=h (s 1), y1=g (s 1), then fitting the parameters x1 and y1 by using a curve fitting tool, and interpolating by using the read temperature C1 (t) at the time t based on the fitted curve to obtain the junction temperature C2 (t) =c2 of the power device 20 at the time t t . This embodiment of the present application is merely a best fit selected based on the characteristics of the power device and the arrangement of the temperature sensors for the fitting method to the discrete points, but the present application is not limited to such a fit. For example, a polynomial fitting method can also be used to call the function polyfit.
It should be noted that, for the power device 20, the junction temperature C2 and the maximum allowable operating current threshold I2 of the power device 20 belong to the inherent properties of the component, and when the power device 20 leaves the factory, the manufacturer (vendor) will provide a parameter table, that is, a table of relation between the junction temperature C2 and the maximum allowable operating current threshold I2, but generally speaking, the manufacturer will only provide several junction temperatures C2 and corresponding several maximum allowable operating current thresholds I2, that is, the parameter table is a table of relation between the junction temperatures C2 and the maximum allowable operating current thresholds I2 of the power device. Therefore, in step S3 of the present application, the controller 40 may obtain the maximum allowable operating current threshold I2 corresponding to the junction temperature C2 of the power device 20 at the time t by interpolation methods, such as nearest point interpolation (nearest) or linear interpolation (linear), according to the plurality of junction temperatures C2 and the parameter table, and may also obtain the maximum allowable operating current threshold I2 corresponding to each junction temperature C2.
Based on the same inventive concept, the present embodiment provides a power device overcurrent control device as shown in fig. 3, which includes a PCB board 10, a plurality of power devices 20, a current sensor, a temperature sensor 30, and a controller 40, wherein the plurality of power devices 20, the temperature sensor 30, and the controller 40 are all mounted on the PCB board 10, the plurality of power devices 20, the current sensor, the temperature sensor 30, and the load 50 are all electrically connected with the controller 40, and the plurality of power devices 20 are all electrically connected with the load 50;
the current sensor is used for monitoring the running current I1 and the bus current Irms of the power devices 20 in real time after the load 50 runs, and the temperature sensor 30 is used for monitoring the temperature C1 of the position of the temperature sensor 30 in real time after the load 50 runs;
the controller 40 is configured to obtain a plurality of junction temperatures C2 corresponding to the plurality of power devices 20 according to the temperature C1 and a preset temperature-junction temperature function;
the controller 40 is further configured to obtain maximum allowable operating current threshold I2 of the plurality of power devices 20 corresponding to the plurality of junction temperatures C2 according to the plurality of junction temperatures C2 and the parameter table; the parameter table is a corresponding relation table of a plurality of junction temperatures C2 and a plurality of maximum allowable working current threshold values I2 of the power device 20;
the controller 40 is further configured to control the load 50 to stop operating according to the operating current I1, the maximum allowable operating current threshold I2, and the duration of the operating current I1;
the controller 40 is further configured to control the load 50 to stop operating according to the magnitudes of the overload U1 and the maximum allowable load Umax and the duration of the overload U1.
In summary, according to the method and the device for preventing the power device from being overcurrded, only one temperature sensor is arranged, and junction temperatures of a plurality of power devices are obtained according to a temperature-junction temperature function fitted in advance, namely, only one temperature sensor can be arranged to detect the junction temperatures of the plurality of power devices in a working state. The operation current and bus current of the power device are monitored, and the maximum allowable working current threshold of the power device is obtained according to the junction temperature and the parameter table, so that the peak current of the power device under the instantaneous working condition is accurately mastered, the instantaneous heavy current protection is performed, the long-time heavy current protection is performed, the load is timely controlled to stop operation, the condition that the hardware is burnt out due to the fact that the operation current of the power device exceeds the maximum allowable working current threshold is avoided, the overcurrent load is calculated, the influence of the large bus current on the hardware is avoided, the power device is further protected from being damaged due to overcurrent, and the reliability of the system is improved.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments 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 to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. The power device overcurrent control method is characterized in that a plurality of power devices, a temperature sensor and a controller are all arranged on a PCB, the power devices, the current sensor, the temperature sensor and a load are all electrically connected with the controller, and the power devices are all electrically connected with the load;
the power device overcurrent control method comprises the following steps:
after the load operates, the current sensor monitors the operating current I1 and the bus current Irms of the power devices in real time, the temperature sensor monitors the temperature of the position of the temperature sensor in real time, and the operating current I1, the bus current Irms and the temperature are transmitted to the controller;
the controller obtains a plurality of junction temperatures corresponding to the power devices respectively according to the temperature and a preset temperature-junction temperature function;
the controller obtains maximum allowable working current threshold I2 of a plurality of power devices corresponding to the junction temperatures according to the junction temperatures and the parameter tables; the parameter table is a corresponding relation table of a plurality of junction temperatures of the power device and a plurality of maximum allowable working current threshold values I2;
the controller controls the load to stop running according to the running current I1, the maximum allowable working current threshold I2 and the duration time of the running current I1,
and/or the controller controls the load to stop running according to the sizes of the overcurrent load U1 and the maximum allowable load Umax and the duration time of the overcurrent load U1.
2. The method of claim 1, wherein before the step of controlling the load to stop operating by the controller according to the magnitudes of the overload load U1 and the maximum allowable load Umax and the duration of the overload load U1, the controller calculates the following formula
Determining an overcurrent load U1; wherein Ic is a preset continuous current limiting value, ts is execution time in the controller, and t is integration times.
3. The method of claim 1, wherein the controller controls the load to stop operating according to the magnitude of the operating current I1 and the maximum allowable operating current threshold I2 and the duration of the operating current I1, comprising:
if I1 > I2 and the duration time is > T1, T1 is a first preset value, the controller controls the load to stop running.
4. The method for preventing over-current control of a power device according to claim 2, wherein the controller controls the load to stop operating according to the magnitudes of the over-current load U1 and the maximum allowable load Umax and the duration of the over-current load U1, comprising:
if U1 is larger than Umax and the duration is longer than T2, T2 is a second preset value, the controller controls the load to stop running.
5. The method of claim 1, wherein the power device comprises a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor.
6. The power device anti-over-current control method according to claim 1, wherein the temperature sensor is arranged at one side of the plurality of power devices.
7. The method for preventing over-current control of a power device according to claim 1, wherein, before the step of obtaining a plurality of junction temperatures corresponding to the plurality of power devices by the controller according to a temperature and a preset temperature-junction temperature function, fitting the preset temperature-junction temperature function is performed, and the fitting method of the preset temperature-junction temperature function is as follows: and for each power device, before the power device is mounted on the PCB, setting a temperature sensor at the mounting position of the power device, thereby obtaining the junction temperature of the power device, obtaining a plurality of discrete points containing the temperature and the junction temperature, fitting the plurality of discrete points containing the temperature and the junction temperature, and obtaining the preset temperature-junction temperature function with minimum deviation of the temperature and the junction temperature.
8. The method for preventing over-current of a power device according to claim 1, wherein the controller obtains the maximum allowable operating current threshold I2 of the plurality of power devices corresponding to the plurality of junction temperatures, respectively, by interpolation method according to the plurality of junction temperatures and the parameter table.
9. The power device anti-over-current control method according to claim 8, wherein the interpolation method includes a nearest neighbor interpolation method or a linear interpolation method.
10. The power device overcurrent control device is characterized by comprising a PCB, a plurality of power devices, a current sensor, a temperature sensor and a controller, wherein the power devices, the temperature sensor and the controller are all arranged on the PCB, the power devices, the current sensor, the temperature sensor and the load are all electrically connected with the controller, and the power devices are all electrically connected with the load;
the current sensor is used for monitoring the running current I1 and the bus current Irms of the power devices in real time after the load runs, and the temperature sensor is used for monitoring the temperature of the position of the temperature sensor in real time after the load runs;
the controller is used for obtaining a plurality of junction temperatures corresponding to the power devices respectively according to the temperature and a preset temperature-junction temperature function;
the controller is further used for obtaining maximum allowable working current threshold values I2 of the power devices corresponding to the junction temperatures according to the junction temperatures and the parameter tables; the parameter table is a corresponding relation table of a plurality of junction temperatures of the power device and a plurality of maximum allowable working current threshold values I2;
the controller is further used for controlling the load to stop running according to the running current I1, the maximum allowable working current threshold I2 and the duration time of the running current I1;
the controller is further configured to control the load to stop operating according to the sizes of the overcurrent load U1 and the maximum allowable load Umax and the duration time of the overcurrent load U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311288926.0A CN117613809A (en) | 2023-10-08 | 2023-10-08 | Method and device for preventing power device from overcurrent control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311288926.0A CN117613809A (en) | 2023-10-08 | 2023-10-08 | Method and device for preventing power device from overcurrent control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117613809A true CN117613809A (en) | 2024-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311288926.0A Pending CN117613809A (en) | 2023-10-08 | 2023-10-08 | Method and device for preventing power device from overcurrent control |
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| Country | Link |
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| CN (1) | CN117613809A (en) |
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- 2023-10-08 CN CN202311288926.0A patent/CN117613809A/en active Pending
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