CN104362582A - Treatment method and device for preventing circuit board from being burnt - Google Patents
Treatment method and device for preventing circuit board from being burnt Download PDFInfo
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- CN104362582A CN104362582A CN201410604936.5A CN201410604936A CN104362582A CN 104362582 A CN104362582 A CN 104362582A CN 201410604936 A CN201410604936 A CN 201410604936A CN 104362582 A CN104362582 A CN 104362582A
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Abstract
An embodiment of the invention provides a treatment method and device for preventing a circuit board from being burnt. The treatment method includes: executing shut-off operation used for shutting off a field-effect tube when the current value in a circuit connected in the field-effect tube of the powered circuit board is larger than a current threshold; judging whether the field-effect tube is shut off or not; if not, controlling a power supply to stop powering the circuit board. By the treatment method and device, the circuit board can be effectively prevented from being burnt due to too large current, and the risk that the circuit board is burnt due to the fact that the field-effect tube is not successfully shut off is avoided.
Description
Technical field
The embodiment of the present invention relates to communication technical field, particularly relate to a kind of prevent circuit board from burning processing method and device.
Background technology
When usual arrangement circuit and circuit devcie on circuit boards, by arranging high-power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide layer semiconductcor field effect transistor, be called for short field effect transistor) can several functions be realized, delay as arranged for circuit board and open protective circuit, or provide secondary power supply etc. for circuit board, and by controlling MOSFET, can be burnt to prevent circuit board; Specifically open protective circuit to be provided with the slow of MOSFET, the method preventing circuit board from burning is described in prior art: Fig. 1 is the slow schematic diagram opening protective circuit of in prior art, circuit board being arranged.As shown in Figure 1, the power supply of the delivery outlet P1 output of power-supply device PSU flows to each device on circuit 10 along circuit 10, realizing circuit plate powers on, the delivery outlet P1 of main power source is connected with the VCC pin having delayed control chip, and the ON pin of power-supply device is connected with the ON pin having delayed control chip, and the grid g of the GATE pin and field effect transistor M that have delayed control chip is connected, the SENSE pin having delayed control chip is connected with the drain electrode of field effect transistor M, delay in protective circuit and be also provided with resistance, after having delayed the signal in place that control chip H exported to the ON pin of power-supply device by ON pin senses, GATE pin is made to export conducting voltage (such as 24V), by MOSFET conducting, each device on circuit 10 is started working, when the circuit on circuit board or circuit devcie break down cause electric current excessive time, the pressure reduction at resistance R two ends increases, and delayed control chip H by SENSE pin senses to the change in voltage on drain electrode d, decision circuit plate powers on and flows through greatly, then control GATE pin exports shutoff voltage (such as 0V), MOSFET is turned off, prevent the excessive circuit board that causes of electric current from burning.
Those skilled in the art's discovery circuit plate when using above-mentioned prior art still can be burnt, and therefore adopts above-mentioned prior art effectively not prevent circuit board from burning.
Summary of the invention
The invention provides a kind of prevent circuit board from burning processing method and device, burn for effectively preventing circuit board.
First aspect, the embodiment of the present invention provides a kind of processing method preventing circuit board from burning, and comprising:
When current value in the circuit of field effect transistor conducting in the circuit board powered on is greater than threshold, perform the shutoff operation for turning off described field effect transistor;
Judge whether described field effect transistor is turned off;
If described field effect transistor is not turned off, then controls power supply and stop powering for described circuit board.
In conjunction with first aspect, in the first embodiment, described processing method also comprises:
When the current value in the circuit that field effect transistor in the circuit board powered on is communicated with is not more than threshold, judges whether the value of the conducting resistance of described field effect transistor is greater than resistance thresholding, or judge whether the temperature of described field effect transistor is greater than temperature threshold;
If the value of the conducting resistance of described field effect transistor is greater than resistance thresholding, or the temperature of described field effect transistor is greater than preset temperature, performs the shutoff operation for turning off described field effect transistor.
In conjunction with first aspect or first aspect first execution mode, in this second embodiment, stop being that after described circuit board is powered, described processing method also comprises at control power supply:
Record the information not allowing described circuit board to power on.
In conjunction with first aspect first execution mode, in the third embodiment, also comprise:
After performing described shutoff operation, if described field effect transistor is turned off,
Record does not allow the information of described field effect transistor conducting.
Second aspect, the embodiment of the present invention provides a kind of processing method preventing circuit board from burning, and comprising:
Field effect transistor on the circuit board powered on is detected, determine that the conducting resistance of described field effect transistor is greater than resistance thresholding, or the temperature of described field effect transistor is greater than preset temperature;
Perform the shutoff operation for turning off described field effect transistor.
In conjunction with second aspect, in the first embodiment, after the described shutoff operation of execution, also comprise:
Judge whether described field effect transistor is turned off;
If described field effect transistor is not turned off, then controls power supply and stop powering for described circuit board.
In conjunction with second aspect first execution mode, in this second embodiment, stop being that after described circuit board is powered, described processing method also comprises at control power supply:
Record the information not allowing described circuit board to power on.
In conjunction with first aspect first execution mode, in the third embodiment, also comprise:
If described field effect transistor is turned off, then record the information not allowing described field effect transistor conducting.
The third aspect, the embodiment of the present invention provides a kind of processing unit preventing circuit board from burning, and comprising:
Processing module, for when the current value in the circuit of field effect transistor conducting in the circuit board powered on is greater than threshold, performs the shutoff operation for turning off described field effect transistor;
Judge module, for judging whether described field effect transistor is turned off;
If described processing module is not also turned off for described field effect transistor, then controls power supply and stop powering for described circuit board.
In conjunction with the third aspect, in the first embodiment, described judge module also for
When the current value in the circuit that field effect transistor in the circuit board powered on is communicated with is not more than threshold, judges whether the value of the conducting resistance of described field effect transistor is greater than resistance thresholding, or judge whether the temperature of described field effect transistor is greater than temperature threshold;
If described processing module is also greater than resistance thresholding for the value of the conducting resistance of described field effect transistor, or the temperature of described field effect transistor is greater than preset temperature, perform the shutoff operation for turning off described field effect transistor.
In conjunction with the third aspect or the third aspect first execution mode, in this second embodiment, processing module also for
Record the information not allowing described circuit board to power on.
In conjunction with the third aspect first execution mode, in the third embodiment, after described processing module performs described shutoff operation, if described field effect transistor is turned off, described processing module is also for recording the information not allowing described field effect transistor conducting.
Fourth aspect, the embodiment of the present invention provides a kind of processing unit preventing circuit board from burning, and comprising:
Judge module, for detecting the field effect transistor on the circuit board powered on, determine that the conducting resistance of described field effect transistor is greater than resistance thresholding, or the temperature of described field effect transistor is greater than preset temperature;
Processing module, for performing the shutoff operation for turning off described field effect transistor.
In conjunction with fourth aspect, in the first embodiment, judge module is for judging whether described field effect transistor is turned off;
If described field effect transistor is not turned off, then described processing module stops powering for described circuit board for controlling power supply.
In conjunction with fourth aspect first execution mode, in this second embodiment, described processing module is also for recording the information not allowing described circuit board to power on.
In conjunction with fourth aspect first execution mode, in the third embodiment, if described processing module is also turned off for described field effect transistor, then the information not allowing described field effect transistor conducting is recorded.
The processing method that what the embodiment of the present invention provided prevent circuit board from burning and device, current value in the circuit of field effect transistor conducting in the circuit board powered on be greater than threshold and to field effect transistor perform turn off operation after, in order to avoid causing the unsuccessful shutoff of field effect transistor due to reasons such as field effect transistor inefficacies, the present embodiment can confirm whether field effect transistor is turned off; When determining that field effect transistor is not turned off, controlling power supply and stopping powering for described circuit board, effectively preventing super-high-current from burning circuit board; Compared with prior art, the scheme that the present embodiment provides can effectively prevent the risk that circuit board burns because of the unsuccessful shutoff of field effect transistor.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the slow schematic diagram opening protective circuit of in prior art, circuit board being arranged;
Fig. 2 is the flow chart of the processing method embodiment one that the present invention prevents circuit board from burning;
Fig. 3 is the flow chart of the processing method embodiment two that the present invention prevents circuit board from burning;
Fig. 4 is the flow chart of the processing method embodiment three that the present invention prevents circuit board from burning;
Fig. 5 is the flow chart of the processing method embodiment four that the present invention prevents circuit board from burning;
Fig. 6 is the flow chart of the processing method embodiment five that the present invention prevents circuit board from burning;
Fig. 7 is the schematic diagram of the circuit of in the embodiment of the present invention five, circuit board being arranged;
Fig. 8 is the structural representation of the processing unit embodiment one that the present invention prevents circuit board from burning;
Fig. 9 is the structural representation of the processing unit embodiment two that the present invention prevents circuit board from burning.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 2 is the flow chart of the processing method embodiment one that the present invention prevents circuit board from burning.As shown in Figure 2, the executive agent of the present embodiment is the processing unit preventing circuit board from burning, this processing unit specifically can be integrated in a kind of control chip, as CPLD (Complex Programable Logic Device, CPLD), BMC (Board Management Controller, veneer management control chip) etc., concrete processing method is as follows:
When S101, current value in the circuit of field effect transistor conducting in the circuit board powered on are greater than threshold, perform the shutoff operation for turning off described field effect transistor;
When current value is greater than threshold, explanation electric current is excessive, this excessive electric current can cause the device on circuit (concrete as each element in above-mentioned field effect transistor or the resistance be connected with field effect transistor, load) to burn, therefore need to turn off described field effect transistor, stop excessive electric current to continue to flow through each device on this circuit; Concrete, above-mentioned shutoff operation is the turn-on condition making the difference of the voltage of fet gate and the voltage of source class not meet field effect transistor, just can turn off this field effect transistor; Such as N channel field-effect pipe, to the grid input 0V voltage of the field effect transistor of conducting, field effect transistor just can be made to turn off.
But it is possible, above-mentioned field effect transistor is lost efficacy at current time, as field effect transistor is being in normal open state, now no matter whether the difference of the voltage of grid and the voltage of source class meets the turn-on condition of field effect transistor, this field effect transistor is all conductings, and the shutoff operation that therefore the above-mentioned processing unit preventing circuit board from burning performs not necessarily makes field effect transistor turn off, or fail effectively to make the difference of the voltage of fet gate and the voltage of source class not meet the turn-on condition of field effect transistor, with N channel field-effect pipe for example, the processing unit preventing circuit board from burning performs the operation (namely turning off operation) of the grid input 0V voltage to the field effect transistor of conducting, but 0V voltage fails effectively to input, although the processing unit being equivalent to prevent circuit board from burning performs shutoff operation, but fail field effect transistor is turned off, therefore super-high-current is caused to burn circuit board to prevent because field effect transistor does not successfully turn off, then after execution turns off operation, need to judge whether field effect transistor is turned off.
S102, judge whether field effect transistor is turned off;
If S103 field effect transistor is not turned off, then controls power supply and stop powering for circuit board.
If field effect transistor can not be turned off, then in the present embodiment, processing unit burns in order to avoid circuit board, then control power supply and stop powering for described circuit board.
In the present embodiment, current value in the circuit of field effect transistor conducting in the circuit board powered on be greater than threshold and to field effect transistor perform turn off operation after, in order to avoid causing the unsuccessful shutoff of field effect transistor due to reasons such as field effect transistor inefficacies, the present embodiment can confirm whether field effect transistor is turned off; When determining that field effect transistor is not turned off, controlling power supply and stopping powering for described circuit board, effectively preventing super-high-current from burning circuit board; Compared with prior art, the scheme that the present embodiment provides can effectively prevent the risk that circuit board burns because of the unsuccessful shutoff of field effect transistor.
Fig. 3 is the flow chart of the processing method embodiment two that the present invention prevents circuit board from burning.As shown in Figure 3, the present embodiment is on the basis of the embodiment shown in Fig. 2, makes further description, specifically comprises:
Whether the current value in the circuit of field effect transistor conducting in the circuit board that S201, judgement have powered on is greater than threshold; If so, S203 is performed; If not, S202 is performed.
Concrete, real-time circuit board is detected of the processing unit preventing circuit board from burning in the present embodiment, whether such as, electric current in real-time detection circuit on-board circuitry, or the voltage at some device two ends, be greater than threshold according to the current value in detected value determination circuit;
When current value in the circuit of field effect transistor conducting in the circuit board determining to have powered on is greater than threshold, is performed by S203 and turn off operation, field effect transistor can be turned off and avoid circuit board to burn because the electric current that flows through is excessive;
But consider in some circuit, even if the current value in the circuit of field effect transistor conducting is not more than threshold, but the electric conduction resistive due to field effect transistor causes greatly field effect transistor to be generated heat, and then can circuit board be burnt out, therefore the present embodiment preferably, when current value in the circuit of field effect transistor conducting in the circuit board determining to have powered on is not more than threshold, perform S202, to avoid the situation burning out circuit board because field effect transistor is overheated.
S202, judge whether the value of the conducting resistance of field effect transistor is greater than resistance thresholding; If so, S203 is performed; If not, then stop.
Above-mentioned stopping represents and does not perform each step following, but the processing unit preventing circuit board from burning is still in work, namely continues to detect circuit board, so that Timeliness coverage is greater than threshold, prevents circuit board from burning;
Optionally, when considering that the value of the conducting resistance of field effect transistor is greater than resistance thresholding, field effect transistor can be generated heat, then above-mentioned S202 " is judged whether the temperature of described field effect transistor is greater than temperature threshold by step, if be greater than temperature threshold, performs S203; If be not more than temperature threshold, then stop " substituting; Such as prevent processing unit that circuit board burns by temperature sensor, this temperature sensor is connected with field effect transistor, then temperature sensor is used for the temperature value of the field effect transistor measured in real time to inform the processing unit preventing circuit board from burning, then the processing unit preventing circuit board from burning just can judge whether the temperature of field effect transistor is greater than temperature threshold.
S203, the shutoff performed for turning off described field effect transistor operate.
Field effect transistor to be closed by shutoff operation and have no progeny, the circuit of conducting before making field effect transistor disconnects, thus avoids circuit board to burn because of super-high-current; Field effect transistor is closed and is had no progeny in addition, and field effect transistor no longer continues heating;
S204, judge whether field effect transistor is turned off; If so, S207 is performed; If not, S205 is performed.
S205, control power supply stop powering for circuit board.
Power supply stops being after described circuit board is powered, electric under being equivalent to circuit board, thus no longer includes super-high-current in circuit board, and field effect transistor no longer continues heating.
The information that S206, record do not allow circuit board to power on.
Foregoing circuit plate is arranged in the equipment such as server, computer usually, due to circuit board power on after there will be super-high-current or field effect transistor and generate heat because conducting resistance increases, this circuit board should not re-use; But a few thing module in equipment does not know that this circuit board can power on the risk had by burning again, therefore the operational module that control power supply is powered for described circuit board by checking the information that the processing unit preventing circuit board from burning records, can know that this circuit board does not allow the information powered on.
S207, record do not allow the information of field effect transistor conducting.
Because field effect transistor can be generated heat because conducting resistance increases, therefore this field effect transistor should be in off state and no longer works; But a few thing module in equipment has the risk of burning circuit board because of heating after not knowing this field effect transistor conducting, therefore the operational module that control power supply is powered for described circuit board by checking the information that the processing unit preventing circuit board from burning records, can know that this field effect transistor can not conducting.
In the present embodiment, current value in the circuit of field effect transistor conducting in the circuit board powered on be greater than threshold and to field effect transistor perform turn off operation after, in order to avoid causing the unsuccessful shutoff of field effect transistor due to reasons such as field effect transistor inefficacies, the present embodiment can judge whether described shutoff operation turns off described field effect transistor; When determining that field effect transistor can not be turned off, controlling power supply and stopping powering for described circuit board, effectively preventing super-high-current from burning circuit board; Compared with prior art, the scheme that the present embodiment provides can effectively prevent the risk that circuit board burns because of the unsuccessful shutoff of field effect transistor, and when the current value in the circuit of field effect transistor conducting in the circuit board powered on is not more than threshold, also the field effect transistor that electric conduction resistive is large can be detected, and field effect transistor large for electric conduction resistive turned off, thus the risk that circuit board burns because of field effect transistor heating can be avoided.
Fig. 4 is the flow chart of the processing method embodiment three that the present invention prevents circuit board from burning.As shown in Figure 5, the present embodiment is as follows:
S301, the field effect transistor on the circuit board powered on to be detected, determine that the conducting resistance of described field effect transistor is greater than resistance thresholding.
Optionally, when considering that the value of the conducting resistance of field effect transistor is greater than resistance thresholding, field effect transistor can be generated heat, then above-mentioned S301 " detects the field effect transistor on the circuit board powered on by step, determines that the temperature of described field effect transistor is greater than temperature threshold " and substitutes.
S302, the shutoff performed for turning off described field effect transistor operate.
Because the large field effect transistor of electric conduction resistive can persistent fever when conducting state, along with the accumulation of heat can burn field effect transistor, and then can circuit board be burnt, therefore the present embodiment is used for field effect transistor large for electric conduction resistive to detect, and then turn off the large field effect transistor of electric conduction resistive, burn to avoid circuit board.
In the present embodiment, by detecting the field effect transistor that electric conduction resistive is large, and field effect transistor large for electric conduction resistive is turned off, thus the risk that circuit board burns because of field effect transistor heating can be avoided.
Fig. 5 is the flow chart of the processing method embodiment four that the present invention prevents circuit board from burning.As shown in Figure 5, the present embodiment is on the basis of the embodiment shown in Fig. 4, makes further description, specifically comprises:
S401, the field effect transistor on the circuit board powered on to be detected, judge whether the conducting resistance of field effect transistor is greater than resistance thresholding; If so, S402 is performed; If not, then stop.
Above-mentioned stopping represents and does not perform each step following, but the processing unit preventing circuit board from burning is still in work, namely continues to detect circuit board, so that Timeliness coverage turn off the large field effect transistor of electric conduction resistive, prevents circuit board from burning;
Optionally, when considering that the value of the conducting resistance of field effect transistor is greater than resistance thresholding, field effect transistor can be generated heat, then above-mentioned S401 " is judged whether the temperature of described field effect transistor is greater than temperature threshold by step, if be greater than temperature threshold, performs S402; If be not more than temperature threshold, then stop " substituting.
S402, the shutoff performed for turning off described field effect transistor operate.
By shutoff operation, is had no progeny in field effect transistor pass, make field effect transistor no longer continue heating.
But possible, because field effect transistor lost efficacy, above-mentioned shutoff operation can not make field effect transistor turn off, and therefore also needs to perform S403, reaffirms whether field effect transistor is turned off.
S403, judge whether field effect transistor is turned off; If so, S404 is performed; If not, S405 is performed.
S404, record do not allow the information of field effect transistor conducting.
Foregoing circuit plate is arranged in the equipment such as server, computer usually, and because field effect transistor can be generated heat because conducting resistance increases, therefore this field effect transistor should be in off state and no longer works; But a few thing module in equipment has the risk of burning circuit board because of heating after not knowing this field effect transistor conducting, therefore the operational module that control power supply is powered for described circuit board by checking the information that the processing unit preventing circuit board from burning records, can know that this field effect transistor can not conducting.
S405, control power supply stop powering for circuit board.
Power supply stops being after described circuit board is powered, and electric under being equivalent to circuit board, then field effect transistor no longer works, thus no longer continues heating.
The information that S406, record do not allow described circuit board to power on.
Due to circuit board power on after field effect transistor generate heat because conducting resistance increases, and this field effect transistor can not be turned off, and namely this circuit board should not re-use; But a few thing module in equipment does not know that this circuit board can power on the risk had by burning again, the operational module of therefore powering for described circuit board at control power supply by checking the information that the processing unit preventing circuit board from burning records, can know that this circuit board does not allow the information powered on.
In the present embodiment, by detecting the field effect transistor that electric conduction resistive is large, and field effect transistor large for electric conduction resistive is turned off, thus the risk that circuit board burns because of field effect transistor heating can be avoided; And in order to avoid causing the unsuccessful shutoff of field effect transistor due to reasons such as field effect transistor inefficacies, the present embodiment after shutoff field effect transistor, also can reaffirm whether field effect transistor is successfully turned off; When determining the unsuccessful shutoff of field effect transistor, then illustrating that field effect transistor can not be turned off, power supply need be controlled and stop powering for described circuit board, preventing field effect transistor from continuing heating burnout circuit board.
Fig. 6 is the flow chart of the processing method embodiment five that the present invention prevents circuit board from burning.As shown in Figure 6, the present embodiment is the optional implementation of one of the processing method preventing circuit board from burning, and Fig. 7 is the schematic diagram of the circuit of in the embodiment of the present invention five, circuit board being arranged.As shown in Figure 7, power-supply device (Power Supply, PSU) can provide two-way power supply to export, and a road power supply is used to the main power source that circuit board is powered, namely the main power source that delivery outlet P1 exports flows to each device on circuit 10 along circuit 10, realizing circuit plate powers on; Another road power supply is STB (Standy) power supply of powering to control chip C, namely the delivery outlet P2 of STB power supply is connected with the VCC pin of control chip C, the power supply that the delivery outlet P2 of STB power supply exports is that control chip C powers, and control chip C starts normal work; The PSON pin of power-supply device is connected with the G1 pin of control chip C, and the G2 pin of control chip C is also connected with the ON pin having delayed control chip H, and the grid g of the GATE pin and field effect transistor M that have delayed control chip H is connected; The SENSE pin having delayed control chip H is also connected with the drain electrode d of field effect transistor M, first pin A1 is connected with one end of resistance R, the other end and the d that drains of the second pin A2 and resistance R are connected, three-prong A3 is connected with source class s, then in the circuit shown in Fig. 7, the processing unit preventing circuit board from burning is specially control chip C.
S501, the control chip circuit to field effect transistor conducting on circuit board detects.
After circuit board powers on, each proper device operation in circuit board, control chip C then timing detects the circuit on circuit board, wherein the first pin A1 is connected with one end of resistance R and the voltage V1 of one end of resistance detected, the other end and the d that drains of the second pin A2 and resistance R are connected, the voltage V2 (being also the voltage of drain electrode d) of the other end of resistance then detected, three-prong A3 is connected with source class s and the voltage V3 of source class s detected.
S502, control chip judge whether the difference of V1 and V2 is greater than the first voltage threshold; If so, S504 is performed; If not, S503 is performed.
First voltage threshold is the product of the resistance of Imax and resistance R, and Imax is the lowest high-current value that circuit board allows; When detecting that the difference of V1 and V2 is not more than the first voltage threshold, current value in the circuit 10 of field effect transistor M conducting is not more than threshold, namely there is no super-high-current, but in order to avoid field effect transistor lost efficacy generate heat cause circuit board to burn situation, need S503 be performed; When detecting that the difference of V1 and V2 is greater than the first voltage threshold, there is super-high-current in the circuit 10 of field effect transistor M conducting, then performing S504;
Preferably, in order to prevent error detection, the voltage V2 that the voltage V1 needing the first pin A1 repeating to read preset times (such as 5) to detect and the second pin A2 detects, calculate the difference of voltage V1 and the voltage V2 read each time, if the difference of the voltage V1 read each time and voltage V2 is greater than the first voltage threshold, illustrate that over-current phenomenon avoidance has appearred in circuit 10, namely electric current is excessive, then perform S504.
S503, control chip judge whether the difference of V2 and V3 is greater than the second voltage threshold; If so, S506 is performed; If not, S501 is returned.
Second voltage threshold is represent the maximum differential pressure V0 that field effect transistor M can bear, usual V0=(0.8 × Tjmax-Tambient)/Imax × Rja, and it calculates that process is as follows:
When circuit board normally works, operating current is no more than Imax, so the maximum power that now field effect transistor M can bear is: W=(V2-V3) × Imax, Tjmax after temperature rise on field effect transistor M should be less than 80% derate deducts ambient temperature, otherwise MOSFET may be caused to damage, i.e. T=W × Rja< (0.8 × Tjmax-Tambient), can extrapolate the maximum differential pressure that can bear when field effect transistor normally works according to T=W × Rja< (0.8 × Tjmax-Tambient) and W=(V2-V3) × Imax is: (V2-V3) < (0.8 × Tjmax-Tambient)/Imax × Rja, wherein T is actual temperature in field effect transistor (unit: degree Celsius), the maximum operation temperature (unit: degree Celsius) that Tjmax:MOSFET allows, Tambient: ambient temperature (unit: degree Celsius), the thermal resistance (unit: degree Celsius/watt) of Rja: the Junction to Ambient of field effect transistor,
When detecting that the difference of V2 and V3 is not more than the second voltage threshold, the conducting resistance of field effect transistor M is not greater than resistance thresholding, then field effect transistor M because of heating burnout circuit board, then can not return S501 and continue to detect; When detecting that the difference of V2 and V3 is greater than the second voltage threshold, then perform S506;
Preferably, in order to prevent error detection, the voltage V3 that the voltage V2 needing the second pin A2 repeating to read preset times (such as 5) to detect and three-prong A3 detects, calculate the difference of voltage V2 and the voltage V3 read each time, if the difference of the voltage V2 read each time and voltage V3 is greater than the second voltage threshold, then determine that field effect transistor is overheated, then perform S506.
S504, control chip perform and turn off operation.
The G2 pin of control chip C controls the ON pin having delayed control chip, the GATE pin having delayed control chip is made to export shutoff voltage (such as 0V), then field effect transistor can be turned off, namely cut off the passage of powering to load late-class circuit, prevent super-high-current from burning device and circuit board.
Preferably, consider in load the transmission having data, as memory etc. is writing the information etc. needing record, if turn off field effect transistor suddenly, then likely cause the loss of data in load, therefore can before shutoff field effect transistor, notification payload, by lower electricity, preserves data in time to make load.
S505, control chip judge whether the difference of V1 and V2 is greater than the first voltage threshold; If so, S508 is performed; If not, S509 is performed.
Consider and may delay control chip H fault, or the GATE pin having delayed control chip lost efficacy, or field effect transistor M is in normal open state, successfully field effect transistor can not be turned off by S504, therefore this step is for judging whether field effect transistor successfully turns off, if successfully turn off, the difference of V1 and V2 is not more than the first voltage threshold.
S506, control chip perform and turn off operation.
This step is identical with the implementation of S504, but after this step occurs in S503, that is this step triggers because the resistance of the conducting resistance of field effect transistor is greater than resistance thresholding.
S507, control chip judge whether the difference of V2 and V3 is greater than the second voltage threshold; If not, S509 is performed; If so, S508 is performed.
Consider and may delay control chip fault, or the GATE pin having delayed control chip lost efficacy, or field effect transistor is in normal open state, successfully field effect transistor can not be turned off by S506, therefore this step is for judging whether field effect transistor successfully turns off, if successfully turn off, the difference of V2 and V3 is not more than the second voltage threshold.
S508, control chip control power supply to be stopped powering for circuit board, records the information not allowing described circuit board to power on.
The PSON pin by pin G1 control PSU of control chip C, for closing the main power source of PSU, and in alarm log, record the information not allowing described circuit board to power on, because control chip is by the STB Power supply of PSU, after closing the main power source of PSU, control chip C still can normally work;
When PSU needs again to power for circuit board, query warning daily record, finds to have recorded the information not allowing circuit board to power on, then no longer for circuit board is powered, damage after preventing circuit board from powering on.
S509, control chip record do not allow the information of described field effect transistor conducting.
If delayed control chip or other operational modules when needing conducting field effect transistor M, by query warning daily record, found to have recorded the information not allowing described field effect transistor conducting, then can not conducting field effect transistor M, cause circuit board damage after preventing field effect transistor M conducting.
It should be added that, in actual applications, the circuit on circuit board connects complicated, the voltage triggered field effect transistor conducting again in other devices possible or other circuit somewheres, then control chip is after execution S509, returns and performs S505, or S507, to avoid the unexpected conducting of field effect transistor.
In addition, above-mentioned Fig. 7 is a kind of possible implementation of circuit board, and more flexibly, control chip C can not be arranged on circuit boards, can be arranged on another management board.
It should be added that, content in each step above-mentioned is only a kind of possible implementation realizing preventing circuit board from burning, in actual applications, content and the order of each step can adjust, namely in actual applications, for determining whether the conducting resistance of field effect transistor is greater than resistance thresholding, whether the temperature of field effect transistor is greater than preset temperature, whether the current value in the circuit of field effect transistor conducting in the circuit board powered on is greater than threshold, the mode that after turning off operation and judging to perform shutoff operation, whether field effect transistor is turned off can have multiple, not in the mode described in each step above-mentioned and sequentially for restriction.
In the present embodiment, current value in the circuit of field effect transistor conducting in the circuit board powered on be greater than threshold and to field effect transistor perform turn off operation after, in order to avoid causing the unsuccessful shutoff of field effect transistor due to reasons such as field effect transistor inefficacies, the present embodiment can judge whether described shutoff operation turns off described field effect transistor; When determining that field effect transistor can not be turned off, controlling power supply and stopping powering for described circuit board, effectively preventing super-high-current from burning circuit board; Compared with prior art, the scheme that the present embodiment provides can effectively prevent the risk that circuit board burns because of the unsuccessful shutoff of field effect transistor.
Fig. 8 is the structural representation of the processing unit embodiment one that the present invention prevents circuit board from burning.As shown in Figure 8, the present embodiment comprises:
Processing module 21, for when the current value in the circuit of field effect transistor conducting in the circuit board powered on is greater than threshold, performs the shutoff operation for turning off described field effect transistor;
Judge module 22, for judging whether described field effect transistor is turned off;
If described processing module is not also turned off for described field effect transistor, then controls power supply and stop powering for described circuit board.
Further, described judge module 22 is also for when the current value in the circuit that field effect transistor in the circuit board powered on is communicated with is not more than threshold, judge whether the value of the conducting resistance of described field effect transistor is greater than resistance thresholding, or judge whether the temperature of described field effect transistor is greater than temperature threshold;
If described processing module is also greater than resistance thresholding for the value of the conducting resistance of described field effect transistor, or the temperature of described field effect transistor is greater than preset temperature, perform the shutoff operation for turning off described field effect transistor.
Further, processing module 21 is also for recording the information not allowing described circuit board to power on.
After described processing module 21 performs described shutoff operation, if described field effect transistor is turned off, described processing module 21 is also for recording the information not allowing described field effect transistor conducting.
It should be noted that, the processing unit preventing circuit board from burning in the present embodiment can adopt the mode of hardware and/or software to realize, such as, program in the control chip shown in earlier figures 7 or programmable gate array, in conjunction with each pin of chip, can realize the function of above-mentioned processing module 21 and judge module 22.
In addition, the modules correspondence in each device embodiment above-mentioned performs each step in each embodiment of the method above-mentioned, and concrete implementation detail and technique effect are see each embodiment of the method.
In the present embodiment, current value in the circuit of field effect transistor conducting in the circuit board powered on be greater than threshold and to field effect transistor perform turn off operation after, in order to avoid causing the unsuccessful shutoff of field effect transistor due to reasons such as field effect transistor inefficacies, the present embodiment can judge whether described shutoff operation turns off described field effect transistor; When determining that field effect transistor can not be turned off, controlling power supply and stopping powering for described circuit board, effectively preventing super-high-current from burning circuit board; Compared with prior art, the scheme that the present embodiment provides can effectively prevent the risk that circuit board burns because of the unsuccessful shutoff of field effect transistor.
Fig. 9 is the structural representation of the processing unit embodiment two that the present invention prevents circuit board from burning.As shown in Figure 9, the present embodiment comprises:
Judge module 31, for detecting the field effect transistor on the circuit board powered on, determine that the conducting resistance of described field effect transistor is greater than resistance thresholding, or the temperature of described field effect transistor is greater than preset temperature;
Processing module 32, for performing the shutoff operation for turning off described field effect transistor.
Further, judge module 31 is for judging whether described field effect transistor is turned off;
If described field effect transistor is not turned off, then described processing module 32 stops powering for described circuit board for controlling power supply.
Further, described processing module 32 is also for recording the information not allowing described circuit board to power on.
Further, if described processing module 32 is also turned off for described field effect transistor, then the information not allowing described field effect transistor conducting is recorded.
It should be noted that, the processing unit preventing circuit board from burning in the present embodiment can adopt the mode of hardware and/or software to realize, such as, program in the control chip shown in earlier figures 7 or programmable gate array, in conjunction with each pin of chip, can realize the function of above-mentioned processing module 21 and judge module 22.
In the present embodiment, current value in the circuit of field effect transistor conducting in the circuit board powered on be greater than threshold and to field effect transistor perform turn off operation after, in order to avoid causing the unsuccessful shutoff of field effect transistor due to reasons such as field effect transistor inefficacies, the present embodiment can judge whether described shutoff operation turns off described field effect transistor; When determining that field effect transistor can not be turned off, controlling power supply and stopping powering for described circuit board, effectively preventing super-high-current from burning circuit board; Compared with prior art, the scheme that the present embodiment provides can effectively prevent the risk that circuit board burns because of the unsuccessful shutoff of field effect transistor.
In addition, the modules correspondence in each device embodiment above-mentioned performs each step in each embodiment of the method above-mentioned, and concrete implementation detail and technique effect are see each embodiment of the method.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (16)
1. the processing method preventing circuit board from burning, is characterized in that, comprising:
When current value in the circuit of field effect transistor conducting in the circuit board powered on is greater than threshold, perform the shutoff operation for turning off described field effect transistor;
Judge whether described field effect transistor is turned off;
If described field effect transistor is not turned off, then controls power supply and stop powering for described circuit board.
2. processing method according to claim 1, is characterized in that, described processing method also comprises:
When the current value in the circuit that field effect transistor in the circuit board powered on is communicated with is not more than threshold, judges whether the value of the conducting resistance of described field effect transistor is greater than resistance thresholding, or judge whether the temperature of described field effect transistor is greater than temperature threshold;
If the value of the conducting resistance of described field effect transistor is greater than resistance thresholding, or the temperature of described field effect transistor is greater than preset temperature, performs the shutoff operation for turning off described field effect transistor.
3. processing method according to claim 1 and 2, is characterized in that, stops being that after described circuit board is powered, described processing method also comprises at control power supply:
Record the information not allowing described circuit board to power on.
4. processing method according to claim 2, is characterized in that, also comprises:
After performing described shutoff operation, if described field effect transistor is turned off,
Record does not allow the information of described field effect transistor conducting.
5. the processing method preventing circuit board from burning, is characterized in that, comprising:
Field effect transistor on the circuit board powered on is detected, determine that the conducting resistance of described field effect transistor is greater than resistance thresholding, or the temperature of described field effect transistor is greater than preset temperature;
Perform the shutoff operation for turning off described field effect transistor.
6. processing method according to claim 5, is characterized in that, after the described shutoff operation of execution, also comprises:
Judge whether described field effect transistor is turned off;
If described field effect transistor is not turned off, then controls power supply and stop powering for described circuit board.
7. processing method according to claim 6, is characterized in that, stops being that after described circuit board is powered, described processing method also comprises at control power supply:
Record the information not allowing described circuit board to power on.
8. processing method according to claim 6, is characterized in that, also comprises:
If described field effect transistor is turned off, then record the information not allowing described field effect transistor conducting.
9. the processing unit preventing circuit board from burning, is characterized in that, comprising:
Processing module, for when the current value in the circuit of field effect transistor conducting in the circuit board powered on is greater than threshold, performs the shutoff operation for turning off described field effect transistor;
Judge module, for judging whether described field effect transistor is turned off;
If described processing module is not also turned off for described field effect transistor, then controls power supply and stop powering for described circuit board.
10. processing unit according to claim 9, is characterized in that, described judge module also for
When the current value in the circuit that field effect transistor in the circuit board powered on is communicated with is not more than threshold, judges whether the value of the conducting resistance of described field effect transistor is greater than resistance thresholding, or judge whether the temperature of described field effect transistor is greater than temperature threshold;
If described processing module is also greater than resistance thresholding for the value of the conducting resistance of described field effect transistor, or the temperature of described field effect transistor is greater than preset temperature, perform the shutoff operation for turning off described field effect transistor.
11. processing unit according to claim 9 or 10, is characterized in that, processing module also for
Record the information not allowing described circuit board to power on.
12. processing unit according to claim 10, is characterized in that, after described processing module performs described shutoff operation, if described field effect transistor is turned off, described processing module is also for recording the information not allowing described field effect transistor conducting.
13. 1 kinds of processing unit preventing circuit board from burning, is characterized in that, comprising:
Judge module, for detecting the field effect transistor on the circuit board powered on, determine that the conducting resistance of described field effect transistor is greater than resistance thresholding, or the temperature of described field effect transistor is greater than preset temperature;
Processing module, for performing the shutoff operation for turning off described field effect transistor.
14. processing unit according to claim 13, is characterized in that, judge module is for judging whether described field effect transistor is turned off;
If described field effect transistor is not turned off, then described processing module stops powering for described circuit board for controlling power supply.
15. processing unit according to claim 14, is characterized in that, described processing module is also for recording the information not allowing described circuit board to power on.
16. processing unit according to claim 14, is characterized in that, if described processing module is also turned off for described field effect transistor, then record the information not allowing described field effect transistor conducting.
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| CN201410604936.5A CN104362582B (en) | 2014-10-31 | 2014-10-31 | Prevent the treating method and apparatus that circuit board burns |
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| CN201410604936.5A CN104362582B (en) | 2014-10-31 | 2014-10-31 | Prevent the treating method and apparatus that circuit board burns |
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| CN104362582B (en) | 2018-03-09 |
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