CN103713255A - Circuit fault detection method, circuit fault detection system and controller - Google Patents
Circuit fault detection method, circuit fault detection system and controller Download PDFInfo
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- CN103713255A CN103713255A CN201310683574.9A CN201310683574A CN103713255A CN 103713255 A CN103713255 A CN 103713255A CN 201310683574 A CN201310683574 A CN 201310683574A CN 103713255 A CN103713255 A CN 103713255A
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Abstract
The embodiment of the invention discloses a circuit fault detection method, a circuit fault detection system and a controller. According to the method disclosed by the embodiment of the invention, fault detection is carried out by making use of repeated and cyclic behavior characteristics of a charger after a free-wheeling diode or a capacitor is short-circuited when electronic equipment is in a soft start or operation mode, and fault detection is carried out by making use of the characteristics of capacitor voltage and battery voltage in the operation process of the electronic equipment. According to the embodiment of the invention, different detection schemes are adopted according to different characteristics of the electronic equipment before and after startup, effective detection can be carried out under various operation conditions without increasing the device cost, and false report or missing report does not occur; and over-current signal detection is adopted in the embodiment of the invention to timely perform a wave sealing action, a device can be timely protected during fault detection, the fault coverage is not enlarged, damage to other adjacent devices can be avoided, and the detection is quick and effective.
Description
Technical field
The present invention relates to circuit field, relate in particular to a kind of fault detection method, system and controller.
Background technology
At present, Buck conversion circuit BUCK circuit is widely used in the decompression transformation occasion that each direct current straightens stream, and its circuit is simple, and output current ripple is little, applies more in charger.Wherein, particularly important to the detection of device fault in powerful charger, the especially scene of multiple module paralleling operation CB common battery group, if fault accurately can be located and is quoted, malfunctioning module is cut off rapidly from system, can effectively avoid affecting the operation of whole parallel system.
BUCK circuit of the prior art stays the detection method of diode or output capacitance short circuit to be to continuous: by identification BUCK circuit capacitance voltage die, or BUCK circuit capacitance voltage is low judges whether to have occurred short trouble.The present inventor finds in the research and practice process to prior art; the detection method of prior art can only be quoted fault under specific operation; can only be after output capacitance Voltage Establishment gets up effectively; if but in testing process, protect improper; be easy to cause that fault expands, cause the damage of peripheral devices.While there is diode or capacitance short-circuit fault before if BUCK circuit powers on; once charger starts to start; during switching tube conducting, be equivalent to charger input short; will inevitably trigger overcurrent protection and charger is quit work; charger capacitance voltage cannot be set up, and this just makes the detection scheme of prior art lose efficacy in detection.
Summary of the invention
The embodiment of the present invention provides a kind of fault detection method, system and controller, for detecting accurately and timely the continuous short trouble that stays diode or electric capacity of BUCK circuit.
First aspect present invention provides a kind of fault detection method, comprising:
Step 1: at electronic equipment during in soft-start mode or operational mode, the first controller is when receiving the first over-current signal of second controller transmission and do not receive the second over-current signal in the first preset time, to second controller, send overcurrent reset signal, make second controller interrupt sending the first over-current signal to the first controller, the first controller adds 1 by the value of the first counter, wherein, the value of the first counter is currency, the initial value of the first counter is 0, wherein, the first controller is when receiving the first over-current signal, electronic equipment enters stop mode,
Step 2, interrupt sending after the first over-current signal to the first controller when second controller, the first controller is controlled electronic equipment and is entered soft-start mode or operational mode from stop mode;
Step 3: if the value of the first counter is greater than the first default value in the second preset time, decision circuit generation diode short circuit or capacitance short-circuit fault.
In the possible implementation of the first, in operational mode, the first controller is when receiving the first over-current signal of second controller transmission, and this fault detection method also comprises:
Judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter is added to 1, the value of the second counter is currency, and the initial value of the second counter is 0;
If the value of the second counter is greater than the second default value in the 3rd preset time, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
According in the possible implementation of the first, in the second possible implementation, if capacitance voltage is not less than preset capacitance voltage value, or circuit voltage value is not more than prewired circuit magnitude of voltage, please zero by the second counter.
According to first aspect, implementation or the possible implementation of the second that the first is possible, in the third possible implementation, if receive the second over-current signal in the first preset time, judge that switching tube is short-circuited.
According to first aspect, implementation or the possible implementation of the second that the first is possible, in the 4th kind of possible implementation, after decision circuit generation diode short circuit or capacitance short-circuit fault, close electronic equipment, and disconnect output switch.
According to first aspect, implementation or the possible implementation of the second that the first is possible, in the 5th kind of possible implementation, if before step 1, electronic equipment is in stop mode, and the first controller is controlled electronic equipment and entered soft-start mode.
Second aspect present invention provides a kind of fault detection method, comprising:
In operational mode, the first controller is when receiving the first over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter added to 1, the value of the second counter is currency, and the initial value of the second counter is 0;
If the value of the second counter is greater than the second default value in the 3rd preset time, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
Third aspect present invention provides a kind of controller, comprising:
The first processing unit, for at electronic equipment during in soft-start mode or operational mode, when receiving the first over-current signal of second controller transmission and do not receive the second over-current signal in the first preset time, to second controller, send overcurrent reset signal, make second controller interrupt sending the first over-current signal, the value of the first counter is added to 1, wherein, the value of the first counter is currency, the initial value of the first counter is 0, wherein, when receiving the first over-current signal, electronic equipment enters stop mode;
The second processing unit, for interrupting sending after the first over-current signal when second controller, controls electronic equipment and enters soft-start mode or operational mode from stop mode;
The 3rd processing unit, if be greater than the first default value for the value of the first counter in the second preset time, decision circuit generation diode short circuit or capacitance short-circuit fault.
In the possible implementation of the first, fourth processing unit, be used in operational mode, when receiving the first over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter is added to 1, the value of the second counter is currency, and the initial value of the second counter is 0; If the value of the second counter is greater than the second default value in the 3rd preset time, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
Fourth aspect present invention provides a kind of controller, comprising:
Processing unit, be used in operational mode, when receiving the first over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value that value of the second counter is added to 1, the second counter is currency, and the initial value of the second counter is 0; If the value of the second counter is greater than the second default value in the 3rd preset time, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
The present invention's the 5th face provides a kind of detection tester for electronic circuit fault, comprising:
The first controller providing as the third aspect or the first controller providing as fourth aspect, and second controller; Wherein, second controller for sending the first over-current signal to the first controller, and interrupts sending the first over-current signal to the first controller after receiving overcurrent reset signal.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
In the embodiment of the present invention, when utilizing during in soft start or operational mode, electronic equipment continuously stay the charger iterative cycles behavioral characteristic after diode or capacitance short-circuit to carry out fault detect, and in electronic equipment operational process, utilize the feature of capacitance voltage and cell voltage to carry out fault detect, different characteristics before and after the present embodiment starts according to electronic equipment has adopted different detection schemes, do not increase on the basis of device cost, under various running statuses, all can effectively detect, and can not report by mistake, fail to report, and the present embodiment adopts and detects the action that over-current signal seals ripple in time, in the out of order while of inspection, can accomplish the timely protection to device, and can not expand fault coverage, can avoid causing the damage of other adjacent devices, detect fast effectively.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of BUCK circuit in the embodiment of the present invention;
Fig. 2 is a process flow diagram of fault detection method in the embodiment of the present invention;
Fig. 3 is another process flow diagram of fault detection method in the embodiment of the present invention;
Fig. 4 is the structural drawing of detection tester for electronic circuit fault in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those skilled in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of fault detection method.The embodiment of the present invention also provides corresponding controller, and detection tester for electronic circuit fault.Below describe in detail respectively.Specifically can consult Fig. 1 to Fig. 4:
Embodiment mono-
The embodiment of the present invention provides a kind of fault detection method.For convenience, the angle of the first controller with in checking system for PCB is described.For example, this first controller can be specifically digital signal processor (DSP, Digital Signal Processor).Wherein, this circuit can be a kind of Buck conversion circuit (BUCK circuit), this BUCK circuit can also comprise second controller, and this second controller can be specifically CPLD (CPLD, Complex Programmable Logic Device).This BUCK circuit can be applied on the electronic equipments such as charger.Below will take this circuit application on charger as example is elaborated.
Specifically can consult Fig. 1, Fig. 1 is the schematic diagram of BUCK circuit.It should be noted that, charger has following three kinds of patterns: stop mode, soft-start mode and operational mode.Wherein, when stop mode and soft-start mode, output is opened T and is not opened; While entering operational mode, T opens.
A kind of fault detection method that the embodiment of the present invention provides, can comprise the following steps:
Step 1: at electronic equipment during in soft-start mode or operational mode, the first controller is when receiving the first over-current signal of second controller transmission and do not receive the second over-current signal in the first preset time, to second controller, send overcurrent reset signal, make second controller interrupt sending the first over-current signal to the first controller, the value of the first counter is added to 1, wherein, the value of the first counter is currency, the initial value of the first counter is 0, wherein, when receiving the first over-current signal of the first controller transmission, electronic equipment enters stop mode,
Step 2, interrupt sending after the first over-current signal to the first controller when second controller, the first controller is controlled electronic equipment and is entered soft-start mode or operational mode from stop mode;
Step 3: if the value of the first counter is greater than the first default value in the second preset time, decision circuit generation diode short circuit or capacitance short-circuit fault.
Adopt above-mentioned steps can effectively detect charger before startup or in operational process whether diode short circuit or capacitance short-circuit fault occur.
In addition, can also detect by the following method charger whether diode short circuit or capacitance short-circuit fault occur in operational process.Wherein, this detection method can be used as supplementing of above-mentioned detection method, can to charger, detect together in conjunction with above-mentioned detection method, can find faster whether diode short circuit or capacitance short-circuit fault occur, specifically can be as follows:
When the first controller is when receiving the first over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value that value of the second counter is added to 1, the second counter is currency, and the initial value of the second counter is 0; If the value of the second counter is greater than the second default value in the 3rd preset time, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
As from the foregoing, in the present embodiment, when utilizing during in soft start or operational mode, electronic equipment continuously stay the charger iterative cycles behavioral characteristic after diode or capacitance short-circuit to carry out fault detect, and in electronic equipment operational process, utilize the feature of capacitance voltage and cell voltage to carry out fault detect, different characteristics before and after the present embodiment starts according to electronic equipment has adopted different detection schemes, do not increase on the basis of device cost, under various running statuses, all can effectively detect, and can not report by mistake, fail to report, and the present embodiment adopts and detects the action that over-current signal seals ripple in time, in the out of order while of inspection, can accomplish the timely protection to device, and can not expand fault coverage, can avoid causing the damage of other adjacent devices, detect fast effectively.
Embodiment bis-
In order better to understand such scheme, with concrete application examples, technique scheme is described in detail below, wherein, this first controller can be specifically digital signal processor (DSP, Digital Signal Processor).This second controller can be specifically CPLD (CPLD, Complex Programmable Logic Device), and this electronic equipment can be charger.
Refer to Fig. 2, specifically can be as follows:
101, the operational mode of judgement charger is stop mode, start-up mode or operational mode, if charger, in stop mode, performs step 102, if charger is when start-up mode or operational mode, performs step 103;
If 102 chargers are in stop mode, DSP controls charger and enters soft-start mode, and performs step 103;
103, judge whether DSP receives the I1 that CPLD sends;
If receive, perform step 104.
1031, DSP is when the I1 receiving, and charger enters stop mode.
Should be understood that, I1 is the first over-current signal, and I2 is the second over-current signal.
104, whether judgement receives I2 in the first preset time;
If do not receive I2 in the first preset time, perform step 105;
If receive I2 in the first preset time, perform step 111, judge that switching tube is short-circuited.Wherein, switching tube can be the switching tubes such as triode or field effect transistor.
If 105 do not receive I2 in the first preset time, DSP sends overcurrent reset signal to CPLD, makes CPLD interrupt sending I1 to DSP;
106, DSP adds 1 by the value of the first counter;
Wherein, the value of the first counter is currency, and the initial value of the first counter is 0.
107,, after step 105,, when CPLD interrupts sending I1 to DSP, DSP controls electronic equipment and enters soft-start mode or operational mode from stop mode, continues execution step 103;
108, whether judgement value of the first counter in the second preset time is greater than the first default value;
If be greater than, perform step 109, if be not more than, perform step 110.
If 109 are greater than, the short circuit of decision circuit generation diode or capacitance short-circuit fault, close electronic equipment, and disconnect output switch.
If 110 are not more than, decision circuit is not diode short circuit or capacitance short-circuit fault.
If 111 receive I2 in the first preset time, judge that switching tube is short-circuited.Wherein, switching tube can be the switching tubes such as triode or field effect transistor.
Embodiment tri-
In the present embodiment by judging capacitance voltage and supply voltage value come decision circuitry whether diode short circuit or capacitance short-circuit fault occur, in operational mode, the first controller, when receiving the over-current signal of second controller transmission, can be carried out following steps, refers to Fig. 3:
201, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value;
If capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, performs step 202.If capacitance voltage is not less than preset capacitance voltage value, or circuit voltage value is not more than prewired circuit magnitude of voltage, performs step 206.
If 202 capacitance voltages are less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of counter added to 1.
Wherein, the value of counter is currency, and the initial value of counter is 0.
203, whether judgement is greater than default value in the value of preset time inside counting device;
If 204 are greater than, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
If 205 are not more than, decision circuit is not diode short circuit or capacitance short-circuit fault.
If 206 capacitance voltages are not less than preset capacitance voltage value, or circuit voltage value is not more than prewired circuit magnitude of voltage, please zero by counter.
In addition, can also be in conjunction with the embodiments two and embodiment tri-come decision circuitry whether diode short circuit or capacitance short-circuit fault occur.
For example, can, after step 102, perform step 201, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value.Two kinds of modes, in conjunction with coming decision circuitry whether diode short circuit or capacitance short-circuit fault occur, can be detected more fast and effectively to circuit whether diode short circuit or capacitance short-circuit fault occur.
Embodiment tetra-
In order better to realize such scheme, the present embodiment provides a kind of controller, and for example, this controller can be digital signal processor DSP.Wherein, this circuit can be a kind of BUCK circuit, is applied on the electronic equipments such as charger.Below will take this circuit application on charger as example is elaborated.
The controller that the present embodiment provides specifically can comprise following processing unit:
The first processing unit, for at electronic equipment during in soft-start mode or operational mode, the first controller is when receiving the first over-current signal of second controller transmission and do not receive the second over-current signal in the first preset time, to second controller, send overcurrent reset signal, make second controller interrupt sending the first over-current signal to the first controller, the first controller adds 1 by the value of the first counter, wherein, the value of the first counter is currency, the initial value of the first counter is 0, wherein, when receiving the first over-current signal of the first controller transmission, electronic equipment enters stop mode,
The second processing unit, sends after the first over-current signal to the first controller for interrupting when second controller, and the first controller is controlled electronic equipment and entered soft-start mode or operational mode from stop mode;
The 3rd processing unit, if be greater than the first default value for the value of the first counter in the second preset time, decision circuit generation diode short circuit or capacitance short-circuit fault.
In addition, dsp can also comprise fourth processing unit, and whether the situation of diode short circuit or capacitance short-circuit fault occurs in operational process for detection of charger.
Concrete, this fourth processing unit, be used in operational mode, the first controller, when receiving the first over-current signal of second controller transmission, judges whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter added to 1, the value of the second counter is currency, and the initial value of the second counter is 0; If the value of the second counter is greater than the second default value in the 3rd preset time, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
As from the foregoing, in the embodiment of the present invention, when utilizing during in soft start or operational mode, electronic equipment continuously stay the charger iterative cycles behavioral characteristic after diode or capacitance short-circuit to carry out fault detect, and in electronic equipment operational process, utilize the feature of capacitance voltage and cell voltage to carry out fault detect, different characteristics before and after the present embodiment starts according to electronic equipment has adopted different detection schemes, do not increase on the basis of device cost, under various running statuses, all can effectively detect, and can not report by mistake, fail to report, and the present embodiment adopts and detects the action that over-current signal seals ripple in time, in the out of order while of inspection, can accomplish the timely protection to device, and can not expand fault coverage, can avoid causing the damage of other adjacent devices, detect fast effectively.
Embodiment five
In order better to realize such scheme, the present embodiment provides a kind of controller, and for example, this controller can be CPLD (CPLD, Complex Programmable Logic Device).Wherein, this circuit can be a kind of BUCK circuit, is applied on the electronic equipments such as charger.Below will take this circuit application on charger as example is elaborated.
The controller that the present embodiment provides specifically can comprise processing unit, be used in operational mode, when receiving the first over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter is added to 1, the value of the second counter is currency, and the initial value of the second counter is 0; If the value of the second counter is greater than the second default value in the 3rd preset time, the short circuit of decision circuit generation diode or capacitance short-circuit fault.
Embodiment six
In the present embodiment, also provide a kind of detection tester for electronic circuit fault, can comprise the first controller and second controller.Wherein, the first controller can be specifically digital signal processor DSP, and second controller is specifically as follows complex programmable logic device (CPLD), specifically can be referring to above-described embodiment, and the present embodiment repeats no more.Wherein, this circuit can be a kind of BUCK circuit, is applied on the electronic equipments such as charger.Below will take this circuit application on charger as example is elaborated.Concrete structure can be consulted Fig. 4, and Fig. 4 is a structural drawing of detection tester for electronic circuit fault in the present embodiment.
Wherein, DSP controls the operation of charger, the pulse signal that CPLD processing DSP is sent, and determine to open the driving pulse that DSP sends or block the driving pulse that DSP sends according to operating mode.CPLD receiving inductance overcurrent signal, this over-current signal divides two gears, the first over-current signal and the second over-current signal, wherein, the over-current signal I1 in Fig. 4 is the first over-current signal, and over-current signal I2 is the second over-current signal.Over-current signal I1 continues several us, and over-current signal I2 continues 2 switch periods (tens us) above times, and CPLD understands locking pulse after over-current signal being detected, until DSP sends reset signal to CPLD.
Detecting step when charger is not opened specifically can be as follows:
Step 1, charger are from stopping starting to carry out soft start, and less output pulse will trigger over-current signal I1;
Step 2, CPLD receive over-current signal I1, and block the driving pulse of charger, and CPLD sends to over-current signal I1 the DSP that carries out charger control;
Step 3, DSP receive I1 over-current signal, and charge closing device, if do not receive over-current signal I2 in 2s, is thought non-Q short circuit;
Step 4, to CPLD, send overcurrent reset signal, and counter is accumulated once;
Step 5, CPLD receive after overcurrent reset signal, remove the blockade to charger output pulse, interrupt sending over-current signal I1 to DSP;
Step 6, charger, owing to not receiving over-current signal I1, just start to enter soft-start mode from stop mode again, return to execution step one;
Step 7, by above-mentioned circulation, if within a certain period of time, counter is added to (number of times that may recur in time T) n time, thinks that short trouble occurs;
Step 8, pinning short trouble, charge closing device, disconnects output switch, and no longer opens detection of end flow process.
It should be noted that, above-mentioned process fault detection is by reset-startup-overcurrent-locking pulse after the charger-number s of startup-overcurrent-locking pulse-pass ... iterative cycles step come decision circuit whether the continuous short trouble that stays diode or electric capacity occurs.
Detecting step after charger is opened specifically can be as follows:
Step 1, triggering I1 signal;
Step 2, CPLD receive I1 signal locking pulse, and I1 signal is sent to DSP;
Step 3, DSP judge in charger operational mode whether whether capacitance voltage be less than predetermined capacitive magnitude of voltage and cell voltage higher than predetermined voltage value in interruption;
If the result of step 4 step 3 is judged to be, be, return to execution step one,
Step 5, by above-mentioned circulation, if within a certain period of time, the result of step 3 judges be all yes, thinks short trouble generation;
Step 6, pinning short trouble, charge closing device, charger cannot be again from opening, detection of end flow process.
It should be noted that, no if the result of step 3 is judged to be, carry out other faults or judgement extremely.
Should be understood that, if output capacitance is short-circuited in charger operational process, can trigger the pulse of overcurrent envelope and shutdown, the detection method in the time of before can entering charger and opening.That is to say, the detection method after charger is opened can be used as supplementing of rapidity before charger is opened, though do not do scheme after charger is opened effectively detecting circuit whether there is to continue the short trouble that stays diode or electric capacity.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is to come the hardware that instruction is relevant to complete by program, program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
Above a kind of fault detection method provided by the present invention, system and controller are described in detail, applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for those skilled in the art, the thought according to the embodiment of the present invention, all will change in specific embodiments and applications, and in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. a fault detection method, is characterized in that, comprising:
Step 1: at electronic equipment during in soft-start mode or operational mode, the first controller is when receiving the first over-current signal of second controller transmission and do not receive the second over-current signal in the first preset time, to second controller, send overcurrent reset signal, make second controller interrupt sending the first over-current signal to the first controller, the first controller adds 1 by the value of the first counter, wherein, the value of described the first counter is currency, the initial value of the first counter is 0, wherein, the first controller is when receiving the first over-current signal, described electronic equipment enters stop mode,
Step 2, when described second controller interrupts sending after the first over-current signal to the first controller, the first controller is controlled described electronic equipment and is entered soft-start mode or operational mode from stop mode;
Step 3: if the value of described the first counter is greater than the first default value in the second preset time, judge described circuit generation diode short circuit or capacitance short-circuit fault.
2. method according to claim 1, is characterized in that, in operational mode, the first controller is when receiving the first over-current signal of second controller transmission, and this fault detection method also comprises:
Judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter is added to 1, the value of described the second counter is currency, and the initial value of the second counter is 0;
If the value of described the second counter is greater than the second default value in the 3rd preset time, judge described circuit generation diode short circuit or capacitance short-circuit fault.
3. method according to claim 2, is characterized in that,
If capacitance voltage is not less than preset capacitance voltage value, or circuit voltage value is not more than prewired circuit magnitude of voltage, please zero by the second counter.
4. according to the method in any one of claims 1 to 3, it is characterized in that,
If receive the second over-current signal in the first preset time, judge that switching tube is short-circuited.
5. according to the method in any one of claims 1 to 3, it is characterized in that,
After judging described circuit generation diode short circuit or capacitance short-circuit fault, close described electronic equipment, and disconnect output switch.
6. according to the method in any one of claims 1 to 3, it is characterized in that,
If before step 1, electronic equipment is in stop mode, and the first controller is controlled described electronic equipment and entered soft-start mode.
7. a fault detection method, is characterized in that, comprising:
In operational mode, the first controller is when receiving the over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of counter added to 1, the value of described counter is currency, and the initial value of counter is 0;
If the value of described counter is greater than default value in preset time, judge described circuit generation diode short circuit or capacitance short-circuit fault.
8. a controller, is characterized in that, comprising:
The first processing unit, for at electronic equipment during in soft-start mode or operational mode, when receiving the first over-current signal of second controller transmission and do not receive the second over-current signal in the first preset time, to second controller, send overcurrent reset signal, make second controller interrupt sending the first over-current signal, the value of the first counter is added to 1, wherein, the value of described the first counter is currency, the initial value of the first counter is 0, wherein, when receiving the first over-current signal, described electronic equipment enters stop mode;
The second processing unit, for interrupting sending after the first over-current signal when described second controller, controls described electronic equipment and enters soft-start mode or operational mode from stop mode;
The 3rd processing unit, if be greater than the first default value for the value of described the first counter in the second preset time, judges described circuit generation diode short circuit or capacitance short-circuit fault.
9. controller according to claim 8, is characterized in that, also comprises:
Fourth processing unit, be used in operational mode, when receiving the first over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter is added to 1, the value of described the second counter is currency, and the initial value of the second counter is 0; If the value of described the second counter is greater than the second default value in the 3rd preset time, judge described circuit generation diode short circuit or capacitance short-circuit fault.
10. a controller, is characterized in that, comprising:
Processing unit, be used in operational mode, when receiving the first over-current signal of second controller transmission, judge whether capacitance voltage is less than preset capacitance voltage value, and judge whether supply voltage value is greater than preset supply voltage value, if capacitance voltage is less than preset capacitance voltage value, and supply voltage value is greater than preset supply voltage value, the value of the second counter is added to 1, the value of described the second counter is currency, and the initial value of the second counter is 0; If the value of described the second counter is greater than the second default value in the 3rd preset time, judge described circuit generation diode short circuit or capacitance short-circuit fault.
11. 1 kinds of detection tester for electronic circuit faults, is characterized in that, comprising:
The first controller as described in any one in claim 8 to 9 or the first controller as claimed in claim 10, and second controller;
Wherein, described second controller for sending the first over-current signal to the first controller, and interrupts sending the first over-current signal to the first controller after receiving overcurrent reset signal.
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