CN102427215A - High-voltage arc discharge protective circuit - Google Patents
High-voltage arc discharge protective circuit Download PDFInfo
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- CN102427215A CN102427215A CN2011103272095A CN201110327209A CN102427215A CN 102427215 A CN102427215 A CN 102427215A CN 2011103272095 A CN2011103272095 A CN 2011103272095A CN 201110327209 A CN201110327209 A CN 201110327209A CN 102427215 A CN102427215 A CN 102427215A
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Abstract
The invention discloses a high-voltage arc discharge protective circuit, which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a PNP (Positive-Negative-Positive) triode, a first NPN (Negative-Positive-Negative) triode, a first diode, a second diode and a third diode. The other end of the seventh capacitor is grounded, a cathode of the third diode is a signal output end, and the signal output end is connected with a drive chip of a drive half-bridge circuit. When arc discharge exists one high-voltage end, the first NPN triode is communicated with the PNP triode, a voltage signal larger than 2V is outputted from the signal output end to the drive chip, the drive chip instantly stops driving the half-bridge circuit to work, an inverter also stops working, no output exists the high-voltage end, a power supply board can not have arc discharge, thus the power supply board is prevented from burning.
Description
[technical field]
The present invention relates to fluorescent tube, relate in particular to a kind of high pressure arcing protective circuit.
[background technology]
Fluorescent tube of the prior art comprises half-bridge circuit and inverter, and two inputs of inverter are connected with half-bridge circuit, and two outputs of inverter are respectively high-pressure side.When there was arcing at one of them high-pressure side place, the voltage of high-pressure side can change, and can cause power panel to burn machine.
[summary of the invention]
The invention provides a kind of high pressure arcing protective circuit, can prevent that power panel from burning machine.
Technical scheme of the present invention is:
A kind of high pressure arcing protective circuit comprises: first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, PNP triode, a NPN triode, first diode, second diode and the 3rd diode;
One of them output of one termination inverter of the 3rd electric capacity; The other end is connected with another output of inverter through first resistance, second resistance, the 4th electric capacity successively; The tie point ground connection of first resistance and second resistance, two outputs of this inverter are respectively high-pressure side; One end of the 3rd resistance is connected with the tie point of the 3rd electric capacity with first resistance; The other end of the 3rd resistance is connected with the anode of first diode; One end of the 4th resistance is connected with the tie point of second resistance with the 4th electric capacity; The other end of the 4th resistance is connected with the anode of second diode, and the tie point of the 3rd resistance and first diode is connected with the tie point of the 4th resistance with second diode; One end of the 5th resistance is connected with the cathode connection of first diode with second diode, and the other end of the 5th resistance is through the 6th grounding through resistance;
One termination power end of the 6th electric capacity; Through the 7th resistance, the 5th capacity earth, an end of the 8th resistance is connected with the emitter of power end, PNP triode respectively the other end successively, and the other end of the 8th resistance is connected with base stage, the 6th electric capacity and the tie point of the 7th resistance of PNP triode respectively; The collector electrode of PNP triode connects the collector electrode of a NPN triode through the 9th resistance; The tie point of the 5th resistance and the 6th resistance is connected with the tie point of the 7th resistance with the 5th electric capacity, and is connected the grounded emitter of a NPN triode with the base stage of a NPN triode; The anode of the 3rd diode is connected with the collector electrode of PNP triode, an end of the 7th electric capacity respectively; The other end ground connection of the 7th electric capacity, the negative electrode of the 3rd diode are signal output part, and this signal output part is connected with the chip for driving that drives half-bridge circuit.
High pressure arcing protective circuit of the present invention, when there was arcing at a high-pressure side place therein, the voltage at high-pressure side place changed; The one NPN triode and PNP triode meeting conducting can be exported a voltage signal greater than 2V from signal output part and given chip for driving, and chip for driving promptly stops to drive half-bridge circuit work; Inverter also can quit work; High-pressure side place no-output, just not arcing again of power panel prevents that power panel from burning machine.
[description of drawings]
Fig. 1 is high pressure arcing protective circuit of the present invention circuit theory diagrams in one embodiment;
Fig. 2 is high pressure arcing protective circuit of the present invention circuit theory diagrams in another embodiment.
[embodiment]
Below in conjunction with accompanying drawing specific embodiment of the present invention is done a detailed elaboration.
Like Fig. 1; High pressure arcing protective circuit of the present invention comprises: first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, PNP triode Q3, a NPN triode Q4, the first diode D1, the second diode D2 and the 3rd diode D3;
One of them output 3 of one termination inverter T1 of the 3rd capacitor C 3; The other end is connected with another output 1 of inverter T1 through first resistance R 1, second resistance R 2, the 4th capacitor C 4 successively; The tie point ground connection of first resistance R 1 and second resistance R 2, two outputs 1,3 of this inverter T1 be respectively high-pressure side+HV2 ,+HV1; One end of the 3rd resistance R 3 is connected with the tie point of the 3rd capacitor C 3 and first resistance R 1; The other end of the 3rd resistance R 3 is connected with the anode of the first diode D1; One end of the 4th resistance R 4 is connected with the tie point of second resistance R 2 and the 4th capacitor C 4; The other end of the 4th resistance R 4 is connected with the anode of the second diode D2, and the tie point of the 3rd resistance R 3 and the first diode D1 is connected with the tie point of the 4th resistance R 4 and the second diode D2; One end of the 5th resistance R 5 is connected with the cathode connection of the first diode D1 and the second diode D2, and the other end of the 5th resistance R 5 is through the 6th resistance R 6 ground connection;
The one termination power end VCC (voltage at VCC place is about 5V) of the 6th capacitor C 6; The other end is successively through the 7th resistance R 7, the 5th capacitor C 5 ground connection; One end of the 8th resistance R 8 is connected with the emitter of power end VCC, PNP triode Q3 respectively; The other end of the 8th resistance R 8 is connected with the tie point of base stage, the 6th capacitor C 6 and the 7th resistance R 7 of PNP triode Q3 respectively, and the collector electrode of PNP triode Q3 connects the collector electrode of a NPN triode Q4 through the 9th resistance R 9, and the tie point of the 5th resistance R 5 and the 6th resistance R 6 is connected with the tie point of the 7th resistance R 7 and the 5th capacitor C 5; And be connected with the base stage of a NPN triode Q4; The grounded emitter of the one NPN triode Q4, the anode of the 3rd diode D3 are connected the other end ground connection of the 7th capacitor C 7 with the collector electrode of PNP triode Q3, an end of the 7th capacitor C 7 respectively; The negative electrode of the 3rd diode D3 is signal output part Protect, and this signal output part Protect is connected with the chip for driving that drives half-bridge circuit.
During practical implementation; Half-bridge circuit comprises metal-oxide-semiconductor Q1 and Q2, and the drain electrode of metal-oxide-semiconductor Q1 connects the 400V power supply, and the source electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2; The grid of the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 meets drive signal Gate1 and Gate2 respectively; Drive signal Gate1 and Gate2 be by chip for driving output control, the source ground of metal-oxide-semiconductor Q2, and between the source electrode of the drain electrode of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2, be in series with capacitor C 1 and C2; One of them input 6 of inverter T1 is connected between the drain electrode of source electrode and metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1, and another input 7 of inverter T1 is connected between capacitor C 1 and the C2.
High-pressure side+HV1 and+HV2 output phase differ high frequency (about 60KHz), the high pressure (1000Vrms) of 180 degree; Voltage root mean square differs very little (tens V); So the output of the negative electrode of the first diode D1 and the second diode D2 is 0Vrms voltage basically; The one NPN triode Q4 and PNP triode Q3 end, and signal output part Protect is output as 0V, and port+Gate1 is normal with+Gate2 output.When high-pressure side+HV1 perhaps+when there is arcing at the HV2 place ,+HV1 perhaps+voltage of HV2 will change, then the negative electrode of the first diode D1 and the second diode D2 can produce voltage; A NPN triode Q4 understands conducting after reaching certain voltage; Trigger PNP triode Q3 conducting, signal output part Protect can export a voltage signal greater than 2V and give chip for driving, and chip for driving promptly stops to drive half-bridge circuit and quits work; Inverter also quits work; High-pressure side+HV1 and+HV2 no-output, just not arcing again of power panel prevents that power panel from burning machine.
In a preferred embodiment; For prevent high-pressure side+HV1 or+HV2 has end when open circuit; The action of arcing protective circuit; Like Fig. 2, the present invention also comprises: the 4th diode D4, the 5th diode D5, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R 12, the 8th capacitor C 8, the 9th capacitor C 9, the 2nd NPN triode Q5;
The anode of the 4th diode D4 is connected with the tie point of the 3rd capacitor C 3 and first resistance R 1; The anode of the 5th diode D5 is connected with the tie point of second resistance R 2 and the 4th capacitor C 4; One end of the tenth resistance R 10 is connected with the cathode connection of the 4th diode D4 and the 5th diode D5; The other end of the tenth resistance R 10 is through the 8th capacitor C 8 ground connection; The 11 resistance R 11 is connected between the tie point of base stage and the tenth resistance R 10 and the 8th capacitor C 8 of the 2nd NPN triode Q5; Also respectively through the 9th capacitor C the 9, the 12 resistance R 12 ground connection, the grounded emitter of the 2nd NPN triode Q5, collector electrode are connected with the tie point of the 5th resistance R 5 and the 6th resistance R 6 base stage of the 2nd NPN triode Q5.
Can the base voltage of a NPN triode Q4 be dragged down like this, arcing protective circuit of the present invention is not worked, if the time that open circuit is kept 1.5s has then been satisfied not in arcing work.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection range of the present invention.
Claims (2)
1. high pressure arcing protective circuit; It is characterized in that, comprising: first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, PNP triode, a NPN triode, first diode, second diode and the 3rd diode;
One of them output of one termination inverter of the 3rd electric capacity; The other end is connected with another output of inverter through first resistance, second resistance, the 4th electric capacity successively; The tie point ground connection of first resistance and second resistance, two outputs of this inverter are respectively high-pressure side; One end of the 3rd resistance is connected with the tie point of the 3rd electric capacity with first resistance; The other end of the 3rd resistance is connected with the anode of first diode; One end of the 4th resistance is connected with the tie point of second resistance with the 4th electric capacity; The other end of the 4th resistance is connected with the anode of second diode, and the tie point of the 3rd resistance and first diode is connected with the tie point of the 4th resistance with second diode; One end of the 5th resistance is connected with the cathode connection of first diode with second diode, and the other end of the 5th resistance is through the 6th grounding through resistance;
One termination power end of the 6th electric capacity; Through the 7th resistance, the 5th capacity earth, an end of the 8th resistance is connected with the emitter of power end, PNP triode respectively the other end successively, and the other end of the 8th resistance is connected with base stage, the 6th electric capacity and the tie point of the 7th resistance of PNP triode respectively; The collector electrode of PNP triode connects the collector electrode of a NPN triode through the 9th resistance; The tie point of the 5th resistance and the 6th resistance is connected with the tie point of the 7th resistance with the 5th electric capacity, and is connected the grounded emitter of a NPN triode with the base stage of a NPN triode; The anode of the 3rd diode is connected with the collector electrode of PNP triode, an end of the 7th electric capacity respectively; The other end ground connection of the 7th electric capacity, the negative electrode of the 3rd diode are signal output part, and this signal output part is connected with the chip for driving that drives half-bridge circuit.
2. high pressure arcing protective circuit according to claim 1 is characterized in that, also comprises: the 4th diode, the 5th diode, the tenth resistance, the 11 resistance, the 12 resistance, the 8th electric capacity, the 9th electric capacity, the 2nd NPN triode;
The anode of the 4th diode is connected with the tie point of the 3rd electric capacity with first resistance; The anode of the 5th diode is connected with the tie point of second resistance with the 4th electric capacity; One end of the tenth resistance is connected with the cathode connection of the 4th diode with the 5th diode; The other end of the tenth resistance is through the 8th capacity earth; The 11 resistance is connected between the tie point of base stage and the tenth resistance and the 8th electric capacity of the 2nd NPN triode, and also respectively through the 9th electric capacity, the 12 grounding through resistance, the grounded emitter of the 2nd NPN triode, collector electrode are connected with the tie point of the 5th resistance with the 6th resistance the base stage of the 2nd NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110327209.5A CN102427215B (en) | 2011-10-25 | 2011-10-25 | High-voltage arc discharge protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110327209.5A CN102427215B (en) | 2011-10-25 | 2011-10-25 | High-voltage arc discharge protective circuit |
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| Publication Number | Publication Date |
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| CN102427215A true CN102427215A (en) | 2012-04-25 |
| CN102427215B CN102427215B (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110327209.5A Active CN102427215B (en) | 2011-10-25 | 2011-10-25 | High-voltage arc discharge protective circuit |
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| CN (1) | CN102427215B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401222A (en) * | 2013-07-09 | 2013-11-20 | 惠州三华工业有限公司 | LCD (Liquid Crystal Display) backlight inverter power supply high voltage terminal arc discharge protection circuit |
| CN110504824A (en) * | 2019-09-05 | 2019-11-26 | 厦门厦华科技有限公司 | A kind of flow equalizing circuit of dual switch driving |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007166815A (en) * | 2005-12-15 | 2007-06-28 | Toshiba Mitsubishi-Electric Industrial System Corp | Inverter device and method of protecting overvoltage thereof |
| CN201966591U (en) * | 2011-01-10 | 2011-09-07 | 株洲麦格米特电气有限责任公司 | Arcing protection circuit of inverter |
| CN202309019U (en) * | 2011-10-25 | 2012-07-04 | 深圳麦格米特电气股份有限公司 | High-pressure arc discharge protective circuit |
-
2011
- 2011-10-25 CN CN201110327209.5A patent/CN102427215B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007166815A (en) * | 2005-12-15 | 2007-06-28 | Toshiba Mitsubishi-Electric Industrial System Corp | Inverter device and method of protecting overvoltage thereof |
| CN201966591U (en) * | 2011-01-10 | 2011-09-07 | 株洲麦格米特电气有限责任公司 | Arcing protection circuit of inverter |
| CN202309019U (en) * | 2011-10-25 | 2012-07-04 | 深圳麦格米特电气股份有限公司 | High-pressure arc discharge protective circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401222A (en) * | 2013-07-09 | 2013-11-20 | 惠州三华工业有限公司 | LCD (Liquid Crystal Display) backlight inverter power supply high voltage terminal arc discharge protection circuit |
| CN103401222B (en) * | 2013-07-09 | 2016-03-09 | 惠州三华工业有限公司 | A kind of LCD backlight inverter high-pressure side arc discharge protective circuit |
| CN110504824A (en) * | 2019-09-05 | 2019-11-26 | 厦门厦华科技有限公司 | A kind of flow equalizing circuit of dual switch driving |
| CN110504824B (en) * | 2019-09-05 | 2024-03-05 | 厦门厦华科技有限公司 | Dual-switching-tube-driven current equalizing circuit |
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| Publication number | Publication date |
|---|---|
| CN102427215B (en) | 2014-04-30 |
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