CN102231934A - Circuit protection method - Google Patents
Circuit protection method Download PDFInfo
- Publication number
- CN102231934A CN102231934A CN2010100343978A CN201010034397A CN102231934A CN 102231934 A CN102231934 A CN 102231934A CN 2010100343978 A CN2010100343978 A CN 2010100343978A CN 201010034397 A CN201010034397 A CN 201010034397A CN 102231934 A CN102231934 A CN 102231934A
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- CN
- China
- Prior art keywords
- circuit
- delay time
- open
- protection method
- power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invention relates to a circuit protection method, comprising the steps of: judging whether a load circuit is short-circuited, and if not, opening an output circuit; prolonging a first delaying time and judging whether the load circuit is open-circuited; if so, closing the output circuit; prolonging a second delaying time and judging whether the load circuit is open-circuited once again; if so, prolonging the second delaying time repeatedly and judging whether the load circuit is open-circuited once again; and turning off when the repeated time is equal to a first threshold time. According to the invention, when a lamp is abnormal, a protection circuit can act rapidly and accurately so that a power supply of a ballast or a main circuit is cut off until the abnormal state is eliminated and the ballast can return to work normally.
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 band power switching 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 with the power switching, this method comprises:
Judge whether short circuit of load circuit, then open output circuit if not short-circuit condition;
First delay time of delaying time judges whether to be open circuit;
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 first threshold values number of times, number of repetition shuts down.
Describedly judge that load circuit is whether during short circuit, if short-circuit condition is then closed 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 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 second delay time is 6 minutes, and the first threshold values number of times is 5 times.
The described second threshold values number of times is 10 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 this present invention circuit protection method.
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 not short-circuit condition then execution in step 10 open output circuits (the BUCK circuit is a buck DC-DC 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;
Step 13 is if open circuit is then closed output circuit; Close output circuit and sample by the single-chip microcomputer open circuit signaling and realize, when open circuit signaling sampling end voltage is higher than the inner setting reference voltage, the switching on and shutting down signal is put height (closing the BUCK circuit) reach the protection purpose.
Step 14, second delay time of delaying time (6 minutes) execution in step 15 once more judge whether to be open circuit, if second delay time that then repeats to delay time judges whether to be open circuit once more, promptly return and repeat aforementioned process (judging it is not that step for short circuit rises);
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 (5 times).
Describedly judge load circuit whether during short circuit, if short-circuit condition then execution in step 20 close output 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 second threshold values number of times (10 times).
As shown in the figure, described method also comprises: if not open circuit, then execution in step 30, judge whether to require to be output as first power;
If then execution in step 31 switches to first power, if not 32 outputs of execution in step then, 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.
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.
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 5 times.The described second threshold values number of times is 10 times.Described first power is 100W, and described second power is 70W.Described the 3rd delay time is 60 milliseconds.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.
The circuit protection method that band power of the present invention switches comprises three processes: short circuit is judged, open circuit is judged and the power switching judging.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.
The power switching judging:
When load that the user connects is the 70W load, be low level with the unsettled power samples input that makes of input power switch terminal, program will judge that load this moment is the 70W state, 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.
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 (8)
1. a circuit protection method is characterized in that, described method comprises:
Judge whether short circuit of load circuit, then open output circuit if not short-circuit condition;
First delay time of delaying time judges whether to be open circuit;
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 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 is whether during short circuit, if short-circuit condition is then closed 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 second threshold values number of times, number of repetition shuts down.
3. circuit protection method according to claim 1 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.
4. 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.
5. circuit protection method according to claim 1 and 2 is characterized in that described first delay time is 6 seconds, and second delay time is 6 minutes, and the first threshold values number of times is 5 times.
6. circuit protection method according to claim 2 is characterized in that the described second threshold values number of times is 10 times.
7. circuit protection method according to claim 3 is characterized in that described first power is 100W, and described second power is 70W.
8. circuit protection method according to claim 4 is characterized in that described the 3rd delay time is 60 milliseconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100343978A CN102231934A (en) | 2010-01-21 | 2010-01-21 | Circuit protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100343978A CN102231934A (en) | 2010-01-21 | 2010-01-21 | Circuit protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102231934A true CN102231934A (en) | 2011-11-02 |
Family
ID=44844455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100343978A Pending CN102231934A (en) | 2010-01-21 | 2010-01-21 | Circuit protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102231934A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574259A (en) * | 2018-06-22 | 2018-09-25 | 深圳市高胜科研电子有限公司 | A kind of protective device of direct current supply, system and control method |
| CN114649792A (en) * | 2020-12-17 | 2022-06-21 | 深圳市格瑞普电池有限公司 | Emergency starting power supply short-circuit protection method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084279A (en) * | 1992-09-14 | 1994-03-23 | 中国科学技术大学 | Has the high tension megger that postpones short-circuit protection function |
| US5400206A (en) * | 1993-07-27 | 1995-03-21 | Honeywell Inc. | Short circuit and overload protection circuit which allows a predetermined number of reconnection attempts |
| CN1430314A (en) * | 2001-12-31 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Short-circuit protective circuit |
| CN1557114A (en) * | 2001-09-25 | 2004-12-22 | �ʼҷ����ֵ��ӹɷ�����˾ | Electronic ballast system with dual power and dimming capability |
-
2010
- 2010-01-21 CN CN2010100343978A patent/CN102231934A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084279A (en) * | 1992-09-14 | 1994-03-23 | 中国科学技术大学 | Has the high tension megger that postpones short-circuit protection function |
| US5400206A (en) * | 1993-07-27 | 1995-03-21 | Honeywell Inc. | Short circuit and overload protection circuit which allows a predetermined number of reconnection attempts |
| CN1557114A (en) * | 2001-09-25 | 2004-12-22 | �ʼҷ����ֵ��ӹɷ�����˾ | Electronic ballast system with dual power and dimming capability |
| CN1430314A (en) * | 2001-12-31 | 2003-07-16 | 深圳市中兴通讯股份有限公司上海第二研究所 | Short-circuit protective circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574259A (en) * | 2018-06-22 | 2018-09-25 | 深圳市高胜科研电子有限公司 | A kind of protective device of direct current supply, system and control method |
| CN114649792A (en) * | 2020-12-17 | 2022-06-21 | 深圳市格瑞普电池有限公司 | Emergency starting power supply short-circuit protection method and system |
| CN114649792B (en) * | 2020-12-17 | 2023-12-01 | 深圳市格瑞普电池有限公司 | Emergency starting power supply short circuit protection method and system |
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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 |