CN200950534Y - AC overvoltage protection circuitry - Google Patents
AC overvoltage protection circuitry Download PDFInfo
- Publication number
- CN200950534Y CN200950534Y CN 200620015087 CN200620015087U CN200950534Y CN 200950534 Y CN200950534 Y CN 200950534Y CN 200620015087 CN200620015087 CN 200620015087 CN 200620015087 U CN200620015087 U CN 200620015087U CN 200950534 Y CN200950534 Y CN 200950534Y
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- Prior art keywords
- resistance
- triode
- communicated
- series
- voltage
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Abstract
The utility model discloses an AC overvoltage protection circuit which comprises a resistance R1 and a resistance R2 communicated in series, and a triode. The resistance R1 and the resistance R2 are communicated in series, the resistance R1 being communicated with alternating electricity, one end of the resistance R2 being communicated with the ground. The b end of the triode is communicated with the connecting end of the resistance R1 and the resistance R2, while the c end of the triode is communicated with a standby chip feedback and the e end of the triode is communicated with the ground. With AC overvoltage across the circuit, the voltage which the resistance R2 gets is equal to or more than the conducting voltage of the triode, the end of the triode conducts and is being communicated with the ground to force the standby chip to stop working. The utility model adopts the method of adding the triode and two resistances communicated in series which can force the standby chip to stop working when the voltage that the triode gets is equal to or more than the conducting voltage to avoid the damages from AC overvoltage increase.
Description
[technical field]
The utility model relates to alternating current circuit, relates in particular to the interchange overvoltage crowbar.
[background technology]
Present stand-by circuit directly is connected with alternating current to other circuit supplies that link to each other usually.But present alternating current has when uprising suddenly.At this moment, existing stand-by circuit can't bear the alternating current that uprises suddenly, is easy to its circuit or other circuit of being attached thereto are damaged.
[utility model content]
Technical problem to be solved in the utility model is, a kind of interchange overvoltage crowbar is provided, and described circuit comprises resistance R 1 and the R2 that is connected in series, and triode, described resistance R 1 is connected in series with resistance R 2, and described resistance R 1 is connected with alternating current, the other end ground connection of described resistance R 2; The b end of described triode is connected with the link of resistance R 2 with described resistance R 1, the c end is connected with treating machine chip feedback pin, e holds ground connection, when being transferred to the interchange overvoltage of described circuit, described resistance R 2 minutes voltage when being equal to or higher than the conducting voltage of described triode, the e end conducting of described triode is connected with earth terminal, makes and treats that machine chip quits work.
More specifically, described circuit also comprises diode, and described diode and described divider resistance R1 are connected in series, and the electric current through described circuit is carried out rectification.
The utility model compared with prior art; beneficial effect is: two resistance of interchange overvoltage crowbar of the present utility model by increasing triode and being connected in series; the voltage that described triode is got makes when meeting or exceeding conducting voltage treats that machine chip quits work, the damage of avoiding circuit to raise and bring because of alternating voltage.
[description of drawings]
Fig. 1 is an interchange overvoltage crowbar schematic diagram of the present utility model.
[embodiment]
Two resistance of interchange overvoltage crowbar of the present utility model by increasing triode and being connected in series, the voltage of getting at triode make when being higher than the conducting voltage of triode and treat that machine chip quits work, the damage of avoiding circuit to raise and bring because of alternating voltage.
As shown in Figure 1, interchange overvoltage crowbar of the present utility model comprises diode D1, resistance R 1, resistance R 2 and triode Q1.Described diode D1, resistance R 1 are connected in series an end ground connection of resistance R 2 with resistance R 2.The b end of described triode Q1 and the link of described resistance R 1 with resistance R 2, the c end is connected with treating machine chip feedback pin, and e holds ground connection.
Described diode D1 is connected with alternating current, and the electric current through diode D1 is carried out rectification.Voltage by described diode D1 carries out dividing potential drop by resistance R 1 and the R2 that is connected in series, for the b of triode Q1 end provides branch pressure voltage.The C end of described triode Q1 links to each other with the feedback pin for the treatment of machine chip, and whether control gives the standby chip power supply.
When, by the interchange overvoltage of described interchange overvoltage circuit, make described resistance R 2 minutes voltage when being equal to or higher than the conducting voltage Vbe of described triode Q1, described triode Q1 conducting, the e end conducting of triode Q1, thus ground connection be connected with earth terminal, make and treat that machine chip quits work.
When, interchange by described interchange overvoltage circuit is a normal working voltage or when being lower than normal working voltage, described resistance R 2 minutes voltage be lower than the conducting voltage Vbe of described triode Q1, described triode ends, make the described feedback pin of machine chip for the treatment of be in high level, thereby treat the machine chip operate as normal.
Claims (2)
1, a kind of interchange overvoltage crowbar is characterized in that, described circuit comprises resistance R 1 and the R2 that is connected in series, and triode, and described resistance R 1 is connected in series with resistance R 2, and described resistance R 1 is connected with alternating current, the other end ground connection of described resistance R 2; The b end of described triode is connected with the link of resistance R 2 with described resistance R 1, the c end is connected with treating machine chip feedback pin, e holds ground connection, when being transferred to the interchange overvoltage of described circuit, described resistance R 2 minutes voltage when being equal to or higher than the conducting voltage of described triode, the e end conducting of described triode is connected with earth terminal, makes and treats that machine chip quits work.
2, interchange overvoltage crowbar as claimed in claim 1 is characterized in that, described circuit also comprises diode, and described diode and described divider resistance R1 are connected in series, and the electric current through described circuit is carried out rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620015087 CN200950534Y (en) | 2006-09-29 | 2006-09-29 | AC overvoltage protection circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620015087 CN200950534Y (en) | 2006-09-29 | 2006-09-29 | AC overvoltage protection circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200950534Y true CN200950534Y (en) | 2007-09-19 |
Family
ID=38893076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620015087 Expired - Fee Related CN200950534Y (en) | 2006-09-29 | 2006-09-29 | AC overvoltage protection circuitry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200950534Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709873A (en) * | 2012-06-12 | 2012-10-03 | 湖北三江航天红峰控制有限公司 | Overvoltage protection device of electronic circuit |
| WO2018103574A1 (en) * | 2016-12-08 | 2018-06-14 | 深圳创维数字技术有限公司 | Over and under voltage protection circuit and set-top box |
| CN112582999A (en) * | 2020-11-16 | 2021-03-30 | 惠州市德赛西威汽车电子股份有限公司 | Protection circuit for preventing chip pin overvoltage in standby process and after starting |
| US11332592B2 (en) | 2017-09-27 | 2022-05-17 | Advansix Resins & Chemicals Llc | Method for preparing extruded polyamide foams |
-
2006
- 2006-09-29 CN CN 200620015087 patent/CN200950534Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709873A (en) * | 2012-06-12 | 2012-10-03 | 湖北三江航天红峰控制有限公司 | Overvoltage protection device of electronic circuit |
| CN102709873B (en) * | 2012-06-12 | 2015-07-01 | 湖北三江航天红峰控制有限公司 | Overvoltage protection device of electronic circuit |
| WO2018103574A1 (en) * | 2016-12-08 | 2018-06-14 | 深圳创维数字技术有限公司 | Over and under voltage protection circuit and set-top box |
| US11332592B2 (en) | 2017-09-27 | 2022-05-17 | Advansix Resins & Chemicals Llc | Method for preparing extruded polyamide foams |
| CN112582999A (en) * | 2020-11-16 | 2021-03-30 | 惠州市德赛西威汽车电子股份有限公司 | Protection circuit for preventing chip pin overvoltage in standby process and after starting |
| CN112582999B (en) * | 2020-11-16 | 2023-02-14 | 惠州市德赛西威汽车电子股份有限公司 | Protection circuit for preventing chip pin overvoltage in standby process and after starting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070919 Termination date: 20130929 |