CN110783884B - Short circuit self-recovery method and system - Google Patents
Short circuit self-recovery method and system Download PDFInfo
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- CN110783884B CN110783884B CN201910988672.0A CN201910988672A CN110783884B CN 110783884 B CN110783884 B CN 110783884B CN 201910988672 A CN201910988672 A CN 201910988672A CN 110783884 B CN110783884 B CN 110783884B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
Abstract
The invention discloses a short circuit self-recovery method and a system, wherein the short circuit self-recovery method comprises the following steps: utilize first judger to judge the first output voltage and the first output current at power both ends, in order to close the output of power, it is right to utilize first time-recorder the power timing to obtain first timekeeping time, it is right to utilize the second judger the first timekeeping time is judged, in order to open the power, it is right to utilize the second time-recorder the power timing to obtain the second timekeeping time, it is right to utilize the third judger the second timekeeping time is judged to stop timing, utilizes the fourth judger to judge the second output voltage and the second output current at power both ends, in order to acquire whether the power resumes the start. The invention can recover automatically after short circuit and can be electrified to work automatically after short circuit is removed.
Description
Technical Field
The invention relates to the technical field of short circuit self-recovery, in particular to a short circuit self-recovery method and a short circuit self-recovery system.
Background
When the current output by the power supply does not pass through an electrical appliance and is directly connected with the two output stages of the power supply, the power supply is in short circuit. The current will be very high when the power supply is short circuited. The sustained large current may cause damage to the power supply, and more seriously, because the temperature of the short-circuited wire is continuously increased after short circuit, which may cause fire in serious cases.
The conventional power supply short-circuit protection method generally has the following disadvantages: the short circuit can not be recovered, the short circuit can normally work only by being powered on again after being manually powered off after being relieved, the pre-judged short circuit time can not be dynamically adjusted, the service life of the power supply can be reduced, and the power supply can be directly damaged under extreme conditions.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a short circuit self-recovery method and system, which are used to solve the problems in the prior art that self-recovery cannot be performed after a short circuit is removed, normal operation can be performed only by powering on again after manual power failure, the predicted short circuit time cannot be dynamically adjusted, the service life of a power supply may be reduced, and the power supply may be damaged directly in extreme cases.
To achieve the above and other related objects, the present invention provides a short circuit self-recovery method, including:
judging a first output voltage and a first output current at two ends of a power supply so as to close the output of the power supply;
timing the power supply to obtain first timing time;
judging the first timing time to turn on the power supply;
timing the power supply to obtain second timing time;
judging the second timing time to stop timing;
and judging the second output voltage and the second output current at two ends of the power supply to acquire whether the power supply is restarted.
In an embodiment of the present invention, the step of determining the first output voltage and the first output current at two ends of the power supply to turn off the output of the power supply includes:
setting a voltage threshold and a current threshold;
judging whether the first output voltage is smaller than a voltage threshold value and/or whether the first output current is larger than a current threshold value; if yes, the output of the power supply is closed; if not, continuously judging the first output voltage and the first output current at the two ends of the power supply.
In an embodiment of the present invention, the step of determining the first timing time to turn on the power supply includes:
setting a first time threshold;
judging whether the first timing time reaches a first time threshold value, if so, stopping timing the power supply, and starting the power supply; if not, the output of the power supply is continuously closed.
In an embodiment of the present invention, the step of determining the second timing time to stop timing includes:
setting a second time threshold;
judging whether the second timing time reaches a second time threshold value, if so, stopping timing the power supply; if not, continuing to time the power supply to obtain a second timing time.
In an embodiment of the present invention, the step of determining the second output voltage and the second output current at the two ends of the power supply to obtain whether the power supply is restarted includes:
setting a voltage threshold and a current threshold;
judging whether the second output voltage is smaller than a voltage threshold value and/or whether the second output current is larger than a current threshold value; if so, the power supply is in a short-circuit state, and the output of the power supply is continuously closed; if not, the power supply is restarted.
In an embodiment of the present invention, before the determining the first output voltage and the first output current across the power supply to turn off the output of the power supply, the method further includes: a first output voltage and a first output current across the power supply are obtained.
In an embodiment of the present invention, before the determining the second output voltage and the second output current at the two ends of the power supply to obtain whether the power supply is turned on again, the method further includes: and acquiring a second output voltage and a second output current at two ends of the power supply.
In order to achieve the above object, the present invention further provides a short circuit self-recovery system, including:
the first judger is used for judging a first output voltage and a first output current at two ends of a power supply so as to close the output of the power supply;
the first timer is used for timing the power supply to obtain first timing time;
a second determiner configured to determine the first timing time to turn on the power supply;
the second timer is used for timing the power supply to obtain second timing time;
the third judger is used for judging the second timing time to stop timing;
and the fourth judger is used for judging the second output voltage and the second output current at the two ends of the power supply so as to acquire whether the power supply is started again.
In an embodiment of the invention, the short circuit self-recovery system further includes a first output voltage and a current acquirer, configured to acquire the first output voltage and the first output current at two ends of the power supply.
In an embodiment of the present invention, the short circuit self-recovery system further includes: and the second output voltage and current acquirer is used for acquiring a second output voltage and a second output current at two ends of the power supply.
As described above, the short circuit self-recovery method and system of the present invention have the following beneficial effects:
the short circuit self-recovery method of the invention judges the voltage and the current twice, namely judges the first output voltage and the first output current at the two ends of the power supply to close the output of the power supply, and judges the second output voltage and the second output current at the two ends of the power supply to obtain whether the power supply recovers the startup. Therefore, the invention can recover automatically after short circuit and can be electrified to work automatically after short circuit is removed.
The invention can adjust the prejudgment short-circuit time, avoid the damage of the power supply and greatly prolong the service life of the power supply.
Drawings
Fig. 1 is a flowchart of a short circuit self-recovery method according to an embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating an operation of step S1 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present disclosure.
Fig. 3 is a flowchart illustrating an operation of step S3 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present disclosure.
Fig. 4 is a flowchart of an operation of step S5 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present application.
Fig. 5 is a flowchart illustrating an operation of step S6 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present disclosure.
Fig. 6 is a block diagram of a short circuit self-recovery system according to an embodiment of the present disclosure.
Fig. 7 is a block diagram of a short circuit self-recovery system according to another embodiment of the present application.
Fig. 8 is a detailed flowchart of a second timer of a short circuit self-recovery method according to an embodiment of the present disclosure after the second timer is started.
Fig. 9 is a schematic diagram illustrating a specific application of a short circuit self-recovery system according to an embodiment of the present application.
Description of the element reference numerals
1 Power supply
2 universal meter
10 first judging device
20 first timer
30 second judging device
40 second timer
50 the third judger
60 fourth determiner
70 first output voltage, current obtaining device
80 second output voltage, current obtainer
S1-S6
S11-S14
S31-S34
S51-S54
S61-S64 steps
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, and fig. 9, fig. 1 is a flowchart illustrating a short circuit self-recovery method according to an embodiment of the present disclosure. Fig. 2 is a flowchart of an operation of step S1 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present application. Fig. 3 is a flowchart illustrating an operation of step S3 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present disclosure. Fig. 4 is a flowchart illustrating an operation of step S5 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present disclosure. Fig. 5 is a flowchart illustrating an operation of step S6 of the short circuit self-recovery method in fig. 1 according to an embodiment of the present disclosure. Fig. 9 is a schematic diagram illustrating a specific application of a short circuit self-recovery system according to an embodiment of the present application. A short circuit self-recovery method, comprising: first, a first output voltage and a first output current across the power supply 1 need to be obtained. The first output voltage and first output current may be obtained, but are not limited to, by multimeter 2. After the first output voltage and the first output current are obtained, the operation of step S1 is performed. S1, the first determiner 10 determines the first output voltage and the first output current across the power supply 1 to turn off the output of the power supply 1. Specifically, step S1 includes: and S11, setting a voltage threshold and a current threshold. S12, judging whether the first output voltage is smaller than a voltage threshold value and/or whether the first output current is larger than a current threshold value. If the first output voltage is smaller than a voltage threshold and/or the first output current is larger than a current threshold, the operation of step S13 is performed. If the first output voltage is not less than the voltage threshold and/or the first output current is not greater than the current threshold, the operation of step S14 is performed. And S13, turning off the output of the power supply 1. S14, the determination of the first output voltage and the first output current across the power supply 1 in the step S1 is continuously performed. Before S2 is executed, a parameter of the first timer 20 needs to be preset, and the timing length of the first timer 20 is T1, that is, a first time threshold, which is used to set how long the power supply 1 is turned back on after the short-circuit fault occurs and the output is turned off. S2, the power supply 1 is clocked by the first timer 20 to obtain a first clocked time. S3, the second determination device 30 determines the first timer period to turn on the power supply 1. Specifically, step S3 includes: and S31, setting a first time threshold. And S32, judging whether the first timing time reaches a first time threshold value. If the first timing time reaches the first time threshold, the operation of step S33 is performed, and if the first timing time does not reach the first time threshold, the operation of step S34 is performed. And S33, stopping timing the power supply 1 and starting the power supply 1. S34, the output of the power supply 1 is turned off in the step S13 is continuously performed. Before S4, a parameter of the second timer 40 needs to be preset, a timing length of the second timer 40 is a second time threshold T2, the second time threshold is used for turning on the power supply 1 again after the power supply is turned on for the first time or short-circuited, and after T2 time, it is determined whether the power supply 1 is short-circuited. Since whether the power supply 1 is short-circuited is not determined within the time T2, if the power supply 1 is also in a short-circuit state within the time T2, the power supply 1 may be damaged or a fire may occur for too long, even if the power supply 1 is not damaged, the device life of the power supply 1 may be reduced, if the time is too short, since the output voltage of the power supply 1 is increased from 0 to the final steady-state output voltage, and if the time is too short, the voltage is not increased to the voltage threshold, the short may be erroneously determined, and the power supply 1 may not normally operate. S4, the power supply 1 is clocked by the second timer 40 to obtain a second clocked time. S5, the third determiner 50 determines the second measured time to stop measuring time. And S51, setting a second time threshold. And S52, judging whether the second timing time reaches a second time threshold value. If the second timing time reaches the second time threshold, the operation of step S53 is performed. If the second timing time does not reach the second time threshold, the operation of step S54 is performed. And S53, stopping timing the power supply 1. And S54, continuing to time the power supply 1 in the step S4 to obtain a second timing time. The second output voltage and the second output current across the power supply 1 need to be obtained before proceeding to step S6. The second output voltage and second output current may be obtained, but are not limited to, by multimeter 2. After the second output voltage and the second output current are obtained, the operation of step S6 is performed. The obtaining of the second output voltage and the second output current across the power supply 1 may also occur before step S1. S6, determining the second output voltage and the second output current across the power supply 1 by using a fourth determiner, so as to obtain whether the power supply 1 is turned on again. Specifically, step S6 includes: and S61, setting a voltage threshold and a current threshold. And S62, judging whether the second output voltage is smaller than a voltage threshold value and/or whether the second output current is larger than a current threshold value. If the second output voltage is smaller than the voltage threshold and/or the second output current is larger than the current threshold, the operation of step S63 is performed. If the second output voltage is not less than the voltage threshold and/or the second output current is not greater than the current threshold, the operation of step S64 is performed. And S63, the power supply 1 is in a short-circuit state, and the output of the power supply 1 is continuously closed. And S64, the power supply 1 is started again. Specifically, the first time threshold may be set to 3 seconds to 5 minutes, but is not limited thereto, and may also be set to a longer time as needed, and the first time threshold may be set to 1 minute, 2 minutes, 3 minutes, 4 minutes, 6 minutes, and the like. The second time threshold may be set to 10 ms to 500 ms, but not limited thereto, and may also be set to a longer time as needed, and the second time threshold may be set to 70 ms, 100 ms, 200 ms, 300 ms, 400 ms, and the like. The voltage threshold is set according to the rated output voltage of the power supply, and the voltage threshold can be set to 1 volt to 5 volts, but not limited to, and can be set for a longer time as needed, and the voltage threshold can be set to 2 volts, 3 volts, 4 volts, and the like. The current threshold is set according to the rated output current of the power supply, the current threshold can be set to 10 amperes to 100 amperes, but can also be set for a longer time according to needs, and the current threshold can be set to 20 amperes, 30 amperes, 50 amperes, 80 amperes, 100 amperes and the like. The first time threshold is set according to how long the fault is judged again after the short circuit, and the first time threshold is different according to different applications.
Referring to fig. 8, fig. 8 is a specific flowchart of the second timer of the short circuit self-recovery method according to the embodiment of the present disclosure after the second timer is started. After the second timer 40 starts to operate, that is, the power supply is clocked by the second timer in step S4 to obtain a second clocked time, after an interval time T2, the current and the voltage across the power supply 1 are continuously sampled, and at a time n1 × T2 and the time n1 × T2 is less than T2, that is, a second time threshold, it is determined whether the sampled voltage is less than the voltage threshold and/or the sampled current is greater than the current threshold, and if the sampled voltage is less than the voltage threshold and/or the sampled current is greater than the current threshold, T2 is updated to be equal to n1 × T2. And meanwhile, judging whether the output current is smaller than the current threshold value or not and whether the output voltage continuously rises but is smaller than the voltage threshold value or not within the time of the second time threshold value, if so, judging that the initial output voltage is larger than the voltage threshold value at the time of n2 × t2(n2 × t2> the second time threshold value), the output current is always smaller than the current threshold value, and updating that the second time threshold value is equal to n2 × t 2.
Referring to fig. 6 and 7, fig. 6 is a block diagram illustrating a short circuit self-recovery system according to an embodiment of the present disclosure. Fig. 7 is a block diagram of a short circuit self-recovery system according to another embodiment of the present application. Similar to the principle of the short circuit self-recovery method of the present invention, the present invention also provides a short circuit self-recovery system, which includes: a first determiner 10, a first timer 20, a second determiner 30, a second timer 40, a third determiner 50, a fourth determiner 60, a first output voltage, a current acquirer 70, and a second output voltage, current acquirer 80. The first determiner 10, the first timer 20, the second determiner 30, the second timer 40, the third determiner 50, and the fourth determiner 60 are sequentially connected, the first determiner 10 is connected to the first output voltage and current collector 70, and the fourth determiner 60 is connected to the second output voltage and current collector 80. Specifically, the first determiner 10 is configured to determine a first output voltage and a first output current across the power supply 1, so as to turn off the output of the power supply 1. The first timer 20 is used for timing the power supply 1 to obtain a first timing time. The second determiner 30 is configured to determine the first timing time to turn on the power supply 1. The second timer 40 is used for timing the power supply 1 to obtain a second timing time. The third determiner 50 is configured to determine the second timing time to stop timing. The fourth judger 60 is configured to judge the second output voltage and the second output current at two ends of the power supply 1 to obtain whether the power supply 1 is turned on again. The first output voltage and current acquirer 70 is configured to acquire a first output voltage and a first output current across the power supply 1. The second output voltage and current acquirer 80 is configured to acquire a second output voltage and a second output current at two ends of the power supply 1. Specifically, the first output voltage, the current obtaining device 70, the second output voltage, and the current obtaining device 80 may be implemented by the multimeter 2, and the first output voltage, the current obtaining device 70, the second output voltage, and the current obtaining device 80 may also be obtained by other voltage and current measuring devices. The first determiner 10, the second determiner 30, the third determiner 50 and the fourth determiner 60 can be implemented on a computer or a server side. The short circuit self-recovery system is simple in structure and convenient to operate.
In summary, the short circuit self-recovery method of the present invention performs two voltage and current determinations, that is, determines the first output voltage and the first output current at the two ends of the power supply 1 to turn off the output of the power supply 1, and determines the second output voltage and the second output current at the two ends of the power supply 1 to obtain whether the power supply 1 recovers to start up. Therefore, the invention can recover automatically after short circuit and can be electrified to work automatically after short circuit is removed.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A short circuit self-recovery method, comprising:
judging a first output voltage and a first output current across a power supply by using a first judger to turn off an output of the power supply, the judging method of the first judger comprising the steps of: setting a voltage threshold and a current threshold, and judging whether the first output voltage is smaller than the voltage threshold and/or whether the first output current is larger than the current threshold; if yes, the output of the power supply is closed, and if not, the first output voltage and the first output current at the two ends of the power supply are continuously judged;
timing the power supply by using a first timer to obtain first timing time;
judging the first timing time by using a second judging device so as to start the power supply;
timing the power supply by using a second timer to obtain second timing time;
judging the second timing time by using a third judger to stop timing;
judging a second output voltage and a second output current at two ends of a power supply by using a fourth judger to obtain whether the power supply is started again, wherein the judging method of the fourth judger comprises the following steps: judging whether the second output voltage is smaller than a voltage threshold value and/or whether the second output current is larger than a current threshold value; if so, the power supply is in a short-circuit state, and the output of the power supply is continuously closed; if not, the power supply is restarted;
the step of judging the second timing time to stop timing comprises the following steps:
setting a second time threshold;
judging whether the second timing time reaches a second time threshold value, if so, stopping timing the power supply; if not, continuing to perform timing on the power supply to obtain second timing time, and after time interval t2, continuously sampling the current and the voltage at two ends of the power supply, and judging whether the sampled voltage is smaller than a voltage threshold value and/or whether the sampled current is larger than a current threshold value at the time of time n1 × t2 and the time n1 × t2 is smaller than a second time threshold value;
if the sampled voltage is smaller than the voltage threshold and/or the sampled current is larger than the current threshold, updating the second time threshold to be equal to n1 × t2, and meanwhile, judging whether the output current is smaller than the current threshold and whether the output voltage continuously rises but is smaller than the voltage threshold within the moment of the second time threshold;
if the output voltage continues to rise but is less than the voltage threshold, the output voltage is greater than the voltage threshold for the first time at a time when the time n2 × t2 is greater than the second time threshold, the output current is always less than the current threshold, and the second time threshold is updated to be equal to n2 × t 2.
2. The method according to claim 1, wherein the step of determining the first timing time to turn on the power supply comprises:
setting a first time threshold;
judging whether the first timing time reaches a first time threshold value, if so, stopping timing the power supply, and starting the power supply; if not, the output of the power supply is continuously closed.
3. The method of claim 1, wherein before the determining the first output voltage and the first output current across the power supply to turn off the output of the power supply, the method further comprises: a first output voltage and a first output current across the power supply are obtained.
4. The method of claim 1, wherein before the determining the second output voltage and the second output current across the power supply to obtain whether the power supply is turned on again, the method further comprises: and acquiring a second output voltage and a second output current at two ends of the power supply.
5. A short circuit self-recovery system, comprising:
the first judger is used for judging a first output voltage and a first output current at two ends of a power supply so as to close the output of the power supply;
the first timer is used for timing the power supply to obtain first timing time;
a second judging device for judging the first timing time to turn on the power supply;
the second timer is used for timing the power supply to obtain second timing time;
the third judger is used for judging the second timing time to stop timing;
a fourth judger for judging a second output voltage and a second output current at two ends of the power supply to obtain whether the power supply is started up again, wherein the judging method of the fourth judger comprises the following steps: judging whether the second output voltage is smaller than a voltage threshold value and/or whether the second output current is larger than a current threshold value; if so, the power supply is in a short-circuit state, and the output of the power supply is continuously closed; if not, the power supply is restarted;
the step of judging the second timing time to stop timing comprises the following steps:
setting a second time threshold;
judging whether the second timing time reaches a second time threshold value, if so, stopping timing the power supply; if not, continuing to perform timing on the power supply to obtain second timing time, and after time interval t2, continuously sampling the current and the voltage at two ends of the power supply, and judging whether the sampled voltage is smaller than a voltage threshold value and/or whether the sampled current is larger than a current threshold value at the time of time n1 × t2 and the time n1 × t2 is smaller than a second time threshold value;
if the sampled voltage is smaller than the voltage threshold and/or the sampled current is larger than the current threshold, updating the second time threshold to be equal to n1 × t2, and meanwhile, judging whether the output current is smaller than the current threshold and whether the output voltage continuously rises but is smaller than the voltage threshold within the moment of the second time threshold;
if the output voltage continues to rise but is less than the voltage threshold, the output voltage is greater than the voltage threshold for the first time at a time when the time n2 × t2 is greater than the second time threshold, the output current is always less than the current threshold, and the second time threshold is updated to be equal to n2 × t 2.
6. The short circuit self-recovery system according to claim 5, wherein: the short circuit self-recovery system further comprises a first output voltage and current acquirer which is used for acquiring the first output voltage and the first output current at two ends of the power supply.
7. The short circuit self-recovery system according to claim 5, wherein: the short circuit self-recovery system further comprises: and the second output voltage and current acquirer is used for acquiring a second output voltage and a second output current at two ends of the power supply.
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