CN102231933A - Circuit protection method - Google Patents
Circuit protection method Download PDFInfo
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- CN102231933A CN102231933A CN2010100343963A CN201010034396A CN102231933A CN 102231933 A CN102231933 A CN 102231933A CN 2010100343963 A CN2010100343963 A CN 2010100343963A CN 201010034396 A CN201010034396 A CN 201010034396A CN 102231933 A CN102231933 A CN 102231933A
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- circuit
- delay time
- short
- protection method
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention relates to a circuit protection method. The method comprises the following steps: determining whether a load circuit is short-circuited or not, and closing an output circuit if the circuit is short-circuited; prolonging a first time-delay time and determining whether the circuit is short-circuited or not again; if so, repeating prolonging the first time-delay time and determining whether the circuit is short-circuited or not again; and when the number of repetitions reaches a preset first threshold value time, carrying out a shutdown operation. By employing the method in the invention, when a lamp is abnormal, the circuit is protected to operate rapidly and accurately, and a ballast is closed or a main circuit power supply is cut off until finish of an abnormal state and recovery of normal work of the ballast.
Description
Technical field
The present invention relates to a kind of circuit protection method, relate in particular to a kind of circuit protection method of HID lamp ballast.
Background technology
The realization of circuit protection system has dual mode substantially.
First kind is exactly by the various diodes of use, and the mode of the protective circuit that can realize certain defencive function that analogue devices such as triode and operational amplifier are built into a little less than its main shortcoming is subjected to interference performance exactly, is easy to generate the mistake protection.For example, protective circuit can start when sample circuit has been adopted an electric current greater than 0.1 value, and ballast is quit work, and sometimes interference signal can make greater than this value the protective circuit mistake startup and ballast is quit work.And hardware circuit implements quite complexity on power switches, and can increase the cost of manufacture of ballast so virtually, and reliability is also lower.
Another kind of mode is mainly by sending into sampled signal single-chip microcomputer and realizing that by determining whether needing protection after its processing its biggest advantage is exactly accurately, and is controlled, and antijamming capability is strong.Therefore the time of switching on and shutting down and the number of times of protection can be set arbitrarily, are that clearly advantage is arranged with respect to first kind of mode.But this mode implements complexity usually and effect is bad.
Summary of the invention
Not enough in order to solve in the prior art reliability, effect is bad, the invention provides a kind of circuit protection method that switches with power, thereby has realized the protection ballast and switched its operating power that the protection effect is obvious.
For achieving the above object, the invention provides a kind of circuit protection method, this method comprises:
Judge whether short circuit of load circuit, if for short-circuit condition then close output circuit;
First delay time of delaying time judges whether to be short circuit once more, if first delay time that then repeats to delay time judges whether to be short circuit once more;
When reaching the default first threshold values number of times, number of repetition shuts down.
Describedly judge that load circuit whether during short circuit, then opens output circuit if not short-circuit condition, first delay time of delaying time judges whether to be open circuit.
Described method also comprises:
If open circuit is then closed output circuit;
Second delay time of delaying time judges whether to be open circuit once more, if second delay time that then repeats to delay time judges whether to be open circuit once more;
When reaching the default second threshold values number of times, number of repetition shuts down.
Described method also comprises:
If not open circuit, then judge whether to require to be output as first power;
If then switch to first power, if not then exporting second power.
Describedly judge that whether load circuit also comprises before the short circuit:
Close output circuit, open output circuit behind the 3rd delay time of delaying time.
Described first delay time is 6 seconds, and the first threshold values number of times is 10 times.
Described second delay time is 6 minutes, and the second threshold values number of times is 5 times.
Described first power is 100W, and described second power is 70W.
Described the 3rd delay time is 60 milliseconds.
Therefore, adopt the present invention when lamp generation anomaly, protective circuit is moved quickly and accurately, closes the power supply of ballast or cut-out main circuit, removes until abnormality, and ballast recovers operate as normal.
Description of drawings
Fig. 1 is the flow chart of circuit protection method of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
As shown in Figure 1, the flow chart of the circuit protection method that switches for band power of the present invention, the circuit protection method of this band power switching comprises:
Step 1, judge load circuit whether short circuit for example load damage when being in open-circuit condition or outlet line short circuit, if short-circuit condition then execution in step 20 close output circuit (BUCK circuit, i.e. buck DC-DC circuit);
First delay time (6s) (step 21) of delaying time, (step 22) judges whether to be short circuit once more, if first delay time that then repeats to delay time judges whether promptly to repeat aforementioned process (is that the short circuit step begins repetition from judgement) for short circuit once more;
Step 23 (being step 16) is closed ballast or is cut off the power supply of main circuit when number of repetition reaches the default first threshold values number of times (10 times).
Describedly judge load circuit whether during short circuit, if not short-circuit condition then execution in step 10 open output circuits (BUCK circuit); Opening the BUCK circuit is to sample by the short-circuit signal of single-chip microcomputer to realize: when short-circuit signal sampling end voltage is lower than the inner setting reference voltage switching on and shutting down signal is put up to arriving the protection purpose.
Step 11, first delay time (6s) of delaying time, step 12 judges whether to be open circuit;
Describedly judge that whether load circuit also comprises before the short circuit:
Close output circuit (step 100), output circuit (step 102) is opened in the 3rd delay time (step 101) back of delaying time.When judging whether to reach the first or second threshold values number of times, in this embodiment, return when carrying out aforementioned process, return execution in step 102 beginnings, repeat said process.
Wherein, preferably described first delay time is 6 seconds, and second delay time is 6 minutes, and the first threshold values number of times is 10 times.The described second threshold values number of times is 5 times.Described first power is 100W, and described second power is 70W.Described the 3rd delay time is 60 milliseconds.
Circuit protection method of the present invention comprises two processes: short circuit is judged, open circuit is judged.Short circuit is judged: when load is in short-circuit condition (load damages and is in open-circuit condition or outlet line short circuit); start back program detects short-circuit protection state input signal; when detect output be in short-circuit condition after; turn-offing output circuit is not damaged with the protection ballast; calling 6 delay procedure time-delays in seconds then opens output after 6 seconds and judges output state once more; if for short-circuit condition then continue to turn-off output and call 6 seconds delay procedures; and then open output and judge output state; detect so repeatedly and close output after 1 minute altogether 10 times and no longer restart, needing to remove fault and re-power can operate as normal.
Open circuit is judged: be in open-circuit condition (do not connect load or load damage be in open-circuit condition) or because the aging output voltage that causes of fluorescent tube is too high when promptly reaching lamp tube life end voltage in load; start back program detects the open-circuit condition input signal; when detect output be in open-circuit condition after; turn-offing output is not damaged with the protection ballast; calling delay procedure time-delay in 6 minutes then opens output and judges output state once more after 6 minutes; if for open-circuit condition then continue to turn-off output and call 6 minutes delay procedures; and then open output and judge output state; detect so repeatedly and close output after 30 minutes altogether 5 times and no longer restart, needing to remove fault and re-power can operate as normal.
Certainly this method can also comprise the power switching judging: promptly when load that the user connects is the 70W load, with the unsettled power samples input that makes of input power switch terminal is low level, program will judge that load this moment is the 70W state, and ballast will be with the permanent power work of 70W state.When load that the user connects is the 100W load, it is high level that input power switch terminal and any incoming line (being live wire L or zero line N) short circuit are made power switch sampling end, program will judge that load this moment is the 100W state, and ballast will be with the permanent power work of 100W state.Described method also comprises: if not open circuit, then judge whether to require to be output as first power; If then switch to first power, if not then exporting second power.This power switches and is to bring in realization by the permanent power mode sampling of single-chip microcomputer, permanent power mode switch terminal is put the low switching that permanent power circuit is realized permanent power mode of going to control when permanent power mode sampling end voltage is higher than the inner setting reference voltage.
Therefore, adopt the present invention when lamp generation anomaly, protective circuit is moved quickly and accurately, closes the power supply of ballast or cut-out main circuit, removes until abnormality, and ballast recovers operate as normal.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (9)
1. a circuit protection method is characterized in that, described method comprises:
Judge whether short circuit of load circuit, if for short-circuit condition then close output circuit;
First delay time of delaying time judges whether to be short circuit once more, if first delay time that then repeats to delay time judges whether to be short circuit once more;
When reaching the default first threshold values number of times, number of repetition shuts down.
2. circuit protection method according to claim 1 is characterized in that, describedly judges that load circuit whether during short circuit, then opens output circuit if not short-circuit condition, and first delay time of delaying time judges whether to be open circuit.
3. circuit protection method according to claim 2 is characterized in that described method also comprises:
If open circuit is then closed output circuit;
Second delay time of delaying time judges whether to be open circuit once more, if second delay time that then repeats to delay time judges whether to be open circuit once more;
When reaching the default second threshold values number of times, number of repetition shuts down.
4. circuit protection method according to claim 2 is characterized in that described method also comprises:
If not open circuit, then judge whether to require to be output as first power;
If then switch to first power, if not then exporting second power.
5. circuit protection method according to claim 1 is characterized in that describedly judging that whether load circuit also comprises before the short circuit:
Close output circuit, open output circuit behind the 3rd delay time of delaying time.
6. circuit protection method according to claim 1 is characterized in that described first delay time is 6 seconds, and the first threshold values number of times is 10 times.
7. circuit protection method according to claim 3 is characterized in that described second delay time is 6 minutes, and the second threshold values number of times is 5 times.
8. circuit protection method according to claim 4 is characterized in that described first power is 100W, and described second power is 70W.
9. circuit protection method according to claim 5 is characterized in that described the 3rd delay time is 60 milliseconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100343963A CN102231933A (en) | 2010-01-21 | 2010-01-21 | Circuit protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100343963A CN102231933A (en) | 2010-01-21 | 2010-01-21 | Circuit protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102231933A true CN102231933A (en) | 2011-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100343963A Pending CN102231933A (en) | 2010-01-21 | 2010-01-21 | Circuit protection method |
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| Country | Link |
|---|---|
| CN (1) | CN102231933A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107749666A (en) * | 2017-10-27 | 2018-03-02 | 天津津航计算技术研究所 | Electric control system and control method in a kind of SUAV photoelectric nacelle delay |
-
2010
- 2010-01-21 CN CN2010100343963A patent/CN102231933A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107749666A (en) * | 2017-10-27 | 2018-03-02 | 天津津航计算技术研究所 | Electric control system and control method in a kind of SUAV photoelectric nacelle delay |
| CN107749666B (en) * | 2017-10-27 | 2021-03-05 | 天津津航计算技术研究所 | Delayed power-on control system and control method for photoelectric pod of small unmanned aerial vehicle |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111102 |