CN102427215B - High-voltage arc discharge protective circuit - Google Patents
High-voltage arc discharge protective circuit Download PDFInfo
- Publication number
- CN102427215B CN102427215B CN201110327209.5A CN201110327209A CN102427215B CN 102427215 B CN102427215 B CN 102427215B CN 201110327209 A CN201110327209 A CN 201110327209A CN 102427215 B CN102427215 B CN 102427215B
- Authority
- CN
- China
- Prior art keywords
- resistance
- diode
- electric capacity
- tie point
- capacitor
- Prior art date
- 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.)
- Active
Links
Images
Landscapes
- Inverter Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
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 arc discharge 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 is 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 arc discharge protective circuit, can prevent that power panel from burning machine.
Technical scheme of the present invention is:
A kind of high-pressure arc discharge protective circuit, comprising: the first resistance, the 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, the first diode, the 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 by the first resistance, the second resistance, the 4th electric capacity successively, the tie point ground connection of the first resistance and the 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 and the first resistance, the anodic bonding of the other end of the 3rd resistance and the first diode, one end of the 4th resistance is connected with the tie point of the second resistance and the 4th electric capacity, the anodic bonding of the other end of the 4th resistance and the second diode, the tie point of the 3rd resistance and the first diode is connected with the tie point of the 4th resistance and the second diode; One end of the 5th resistance is connected with the cathode connection of the first diode and the second diode, and the other end of the 5th resistance is by the 6th grounding through resistance;
One termination power end of the 6th electric capacity, the other end is successively by the 7th resistance, the 5th capacity earth, one end of the 8th resistance respectively with power end, the emitter of PNP triode connects, the other end of the 8th resistance respectively with the base stage of PNP triode, the 6th electric capacity is connected with the tie point of the 7th resistance, the collector electrode of PNP triode connects the collector electrode of a NPN triode by the 9th resistance, the tie point of the 5th resistance and the 6th resistance is connected with the tie point of the 7th resistance and the 5th electric capacity, and be connected with the base stage of a NPN triode, the grounded emitter of the one NPN triode, the anode of the 3rd diode respectively with the collector electrode of PNP triode, one end of the 7th electric capacity connects, the other end ground connection of the 7th electric capacity, the negative electrode of the 3rd diode is signal output part, this signal output part is connected with the driving chip that drives half-bridge circuit.
High-pressure arc discharge protective circuit of the present invention; when there is arcing at a high-pressure side place therein; the voltage at high-pressure side place changes; the one NPN triode and PNP triode meeting conducting, can export a voltage signal that is greater than 2V to driving chip from signal output part, drives chip to stop driving 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.
[accompanying drawing explanation]
Fig. 1 is high-pressure arc discharge protective circuit of the present invention circuit theory diagrams in one embodiment;
Fig. 2 is high-pressure arc discharge protective circuit of the present invention circuit theory diagrams in another embodiment.
[embodiment]
Below in conjunction with accompanying drawing, specific embodiments of the invention are done to a detailed elaboration.
As Fig. 1, high-pressure arc discharge protective circuit of the present invention, comprising: the first resistance R 1, the 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 by the first resistance R 1, the second resistance R 2, the 4th capacitor C 4 successively, the tie point ground connection of the first resistance R 1 and the second resistance R 2, two outputs 1,3 of this inverter T1 are 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 the first resistance R 1, the anodic bonding of the other end of the 3rd resistance R 3 and the first diode D1, one end of the 4th resistance R 4 is connected with the tie point of the second resistance R 2 and the 4th capacitor C 4, the anodic bonding of the other end of the 4th resistance R 4 and the second diode D2, 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 by the 6th resistance R 6 ground connection;
The one termination power end VCC (voltage at VCC place is 5V left and right) of the 6th capacitor C 6, the other end is successively by the 7th resistance R 7, the 5th capacitor C 5 ground connection, one end of the 8th resistance R 8 respectively with power end VCC, the emitter of PNP triode Q3 connects, the other end of the 8th resistance R 8 respectively with the base stage of PNP triode Q3, the 6th capacitor C 6 is connected with the tie point of the 7th resistance R 7, the collector electrode of PNP triode Q3 connects the collector electrode of a NPN triode Q4 by the 9th resistance R 9, 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 respectively with the collector electrode of PNP triode Q3, one end of the 7th capacitor C 7 connects, the other end ground connection of the 7th capacitor C 7, the negative electrode of the 3rd diode D3 is signal output part Protect, this signal output part Protect is connected with the driving chip that drives half-bridge circuit.
During concrete enforcement, half-bridge circuit comprises metal-oxide-semiconductor Q1 and Q2, the drain electrode of metal-oxide-semiconductor Q1 connects 400V power supply, 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 connects respectively and drives signal Gate1 and Gate2, drive signal Gate1 and Gate2 by driving chip output to control, the source ground of metal-oxide-semiconductor Q2, and be in series with capacitor C 1 and C2 between the drain electrode of metal-oxide-semiconductor Q1 and the source electrode of metal-oxide-semiconductor Q2; One of them input 6 of inverter T1 is connected between the source electrode of metal-oxide-semiconductor Q1 and the drain electrode of metal-oxide-semiconductor Q2, and another input 7 of inverter T1 is connected between capacitor C 1 and C2.
High-pressure side+HV1 and+HV2 output phase differs 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 substantially, the one NPN triode Q4 and PNP triode Q3 cut-off, signal output part Protect is output as 0V, port+Gate1 and+Gate2 output is normal.When high-pressure side+HV1 or+HV2 place is while having arcing, + HV1 or+voltage of HV2 will change, the negative electrode of the first diode D1 and the second diode D2 can produce voltage, after reaching certain voltage, a NPN triode Q4 understands conducting, trigger PNP triode Q3 conducting, signal output part Protect can export a voltage signal that is greater than 2V to driving chip, drive chip to stop driving half-bridge circuit to quit 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 one end when open circuit, arc discharge protective circuit action, as 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 the first resistance R 1, the anode of the 5th diode D5 is connected with the tie point of the 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 by the 8th capacitor C 8 ground connection, the 11 resistance R 11 is connected between the base stage and the tenth resistance R 10 and the tie point of the 8th capacitor C 8 of the 2nd NPN triode Q5, the base stage of the 2nd NPN triode Q5 is also respectively by the 9th capacitor C 9, the 12 resistance R 12 ground connection, the grounded emitter of the 2nd NPN triode Q5, collector electrode is connected with the tie point of the 5th resistance R 5 and the 6th resistance R 6.
The base voltage of a NPN triode Q4 can be dragged down like this, arc discharge protective circuit of the present invention is not worked, if arcing work, can not meet opens a way maintains the time of 1.5s.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (2)
1. a high-pressure arc discharge protective circuit, it is characterized in that, comprising: the first resistance, the 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, the first diode, the 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 by the first resistance, the second resistance, the 4th electric capacity successively, the tie point ground connection of the first resistance and the second resistance, two outputs of this inverter are high-pressure side; One end of the 3rd resistance is connected with the tie point of the 3rd electric capacity and the first resistance, the anodic bonding of the other end of the 3rd resistance and the first diode, one end of the 4th resistance is connected with the tie point of the second resistance and the 4th electric capacity, the anodic bonding of the other end of the 4th resistance and the second diode, the tie point of the 3rd resistance and the first diode is connected with the tie point of the 4th resistance and the second diode; One end of the 5th resistance is connected with the cathode connection of the first diode and the second diode, and the other end of the 5th resistance is by the 6th grounding through resistance;
One termination power end of the 6th electric capacity, the other end is successively by the 7th resistance, the 5th capacity earth, one end of the 8th resistance respectively with power end, the emitter of PNP triode connects, the other end of the 8th resistance respectively with the base stage of PNP triode, the 6th electric capacity is connected with the tie point of the 7th resistance, the collector electrode of PNP triode connects the collector electrode of a NPN triode by the 9th resistance, the tie point of the 5th resistance and the 6th resistance is connected with the tie point of the 7th resistance and the 5th electric capacity, and be connected with the base stage of a NPN triode, the grounded emitter of the one NPN triode, the anode of the 3rd diode respectively with the collector electrode of PNP triode, one end of the 7th electric capacity connects, the other end ground connection of the 7th electric capacity, the negative electrode of the 3rd diode is signal output part, this signal output part is connected with the driving chip that drives half-bridge circuit.
2. high-pressure arc discharge 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 and the first resistance, the anode of the 5th diode is connected with the tie point of the second resistance and the 4th electric capacity, one end of the tenth resistance is connected with the cathode connection of the 4th diode and the 5th diode, the other end of the tenth resistance is by the 8th capacity earth, the 11 resistance is connected between the base stage and the tenth resistance and the tie point of the 8th electric capacity of the 2nd NPN triode, the base stage of the 2nd NPN triode is also respectively by the 9th electric capacity, the 12 grounding through resistance, the grounded emitter of the 2nd NPN triode, collector electrode is connected with the tie point of the 5th resistance and the 6th resistance.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102427215A CN102427215A (en) | 2012-04-25 |
| CN102427215B true CN102427215B (en) | 2014-04-30 |
Family
ID=45961165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110327209.5A Active CN102427215B (en) | 2011-10-25 | 2011-10-25 | High-voltage arc discharge protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102427215B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4942143B2 (en) * | 2005-12-15 | 2012-05-30 | 東芝三菱電機産業システム株式会社 | Inverter device and overvoltage protection method thereof |
-
2011
- 2011-10-25 CN CN201110327209.5A patent/CN102427215B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2007-166815A 2007.06.28 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102427215A (en) | 2012-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203352423U (en) | Switching tube driving amplifying circuit for switching power supply | |
| CN102427215B (en) | High-voltage arc discharge protective circuit | |
| CN105356437B (en) | A kind of anti-surge circuit | |
| CN102868284B (en) | IGBT (Insulated Gate Bipolar Transistor) drive circuit | |
| CN201750125U (en) | Short circuit self-locking protection circuit | |
| CN204068673U (en) | A kind of high reliability middle low power drive unit | |
| CN202309019U (en) | High-pressure arc discharge protective circuit | |
| CN103296875B (en) | A kind of driving spike voltage suppression circuit | |
| CN102307002B (en) | Power switch tube drive circuit with negative pressure turn-off function | |
| CN103687118B (en) | IGBT drive circuit, electromagnetic induction heating device and method thereof | |
| CN202758591U (en) | Backlight LED driving output circuit and television set | |
| CN204089759U (en) | High-frequency power device switch protecting circuit | |
| CN202364110U (en) | High-voltage inversion protection circuit | |
| CN204350428U (en) | Dali input protection circuit | |
| CN102843531A (en) | Drive control circuit and television | |
| CN203911828U (en) | Drive plate control circuit | |
| CN202310199U (en) | Protective circuit for maintaining open circuit | |
| CN105554961A (en) | Backflash prevention circuit of full-voltage high-power light emitting diode (LED) driving secondary circuit | |
| CN201717623U (en) | Switching power tube protection circuit of LCD TV switching power source | |
| CN206251214U (en) | Switching Power Supply IC protection circuits | |
| CN203572869U (en) | Passive peak value follower circuit | |
| CN102427220B (en) | High-voltage inversion protection circuit | |
| CN205039694U (en) | Threshold value adjustable drive circuit and have electrical equipment of this circuit | |
| CN204089758U (en) | High-frequency power device clamping protective circuit | |
| CN204425301U (en) | A kind of drive circuit of servo-driver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |