CN205453654U - Switch tube overvoltage crowbar - Google Patents
Switch tube overvoltage crowbar Download PDFInfo
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- CN205453654U CN205453654U CN201620188031.9U CN201620188031U CN205453654U CN 205453654 U CN205453654 U CN 205453654U CN 201620188031 U CN201620188031 U CN 201620188031U CN 205453654 U CN205453654 U CN 205453654U
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- switching tube
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Abstract
The utility model provides a switch tube overvoltage crowbar, relates to electronic components's overload protection, and circuit unit A and B include a transformer respectively, and a vice limit terminating diode's no. 2 of transformer positive pole, the negative pole of this diode no. 2 connect the one end of electric capacity no. 3, the vice limit second end of another termination transformer of this electric capacity no. 3, the first termination capacitor in former limit of transformer no. 2, resistance no. 1 an and electric capacity first end, another terminating diode negative pole of electric capacity no. 2 and resistance no. 1, diode no. 1 anodal with the former limit of transformer second end and switch tube the drain electrode and connect, a unit electric capacity second end meets with the first end of B unit electric capacity no. 1, a unit transformer secondary winding second end meets with B unit transformer secondary winding second end, a unit diode no. 2 is anodal to meet with two positive poles of B unit diode. Can be fast protection switch pipe effectively, lower cost can be used to overvoltage protection and damaging, handles high voltage input 's power conversion reliably.
Description
Technical field
This utility model relates to overload protection device or the circuit of electronic devices and components, espespecially a kind of switching tube overvoltage crowbar.
Background technology
Along with being widely used of electronic equipment, electronic switching tube application in the electronic device is the widest, in actual use due to abnormal electrical power supply such as overtension, exceeding electronic switching tube, to bear voltage causes electrons switching tube breakdown, thus the damage of whole equipment can be caused, bring great hidden danger.In the prior art, use diode, electric capacity, resistance composition to absorb buffer circuit and absorb the peak voltage of switching tube, but in special application scenario, such as output short-circuit does not absorbs so many energy, the voltage at switching tube two ends still can the highest cause likely damaging, and the situation that especially input voltage is the highest can be the most obvious.
Summary of the invention
For the shortcoming of prior art, the purpose of this utility model is to provide a kind of switching tube overvoltage crowbar.When exceeding the switching tube setting voltage value of setting, PWM can close output immediately, and protection switching tube will not damage because of overvoltage timely and effectively.
nullThis utility model solves its technical problem and be the technical scheme is that a kind of switching tube overvoltage crowbar of offer，Circuit unit A and B including at least two independence，It is characterized in that: circuit unit A and B of said two independence has identical circuit structure，This circuit structure all includes a transformator,The positive pole of secondary coil first terminating diode two of this transformator，The negative pole of this diode two connects one end of electric capacity three，Secondary second end of another termination transformator of this electric capacity three，Primary coil first termination capacitor two of described transformator、Resistance one and electric capacity one first end,Another terminating diode one negative pole of electric capacity two and resistance one，Diode one positive pole and primary transformer coil the second end and the drain electrode of switching tube also connect，A cell capacitance one second end connects with the first end of unit B electric capacity one，A unit transformer secondary coil the second end connects with unit B secondary transformer the second end，A cell diodes two positive pole connects with unit B diode two positive pole，A unit switch pipe source electrode is this protection circuit the first terminals、The drain electrode of unit B switching tube connects this cell capacitance one second end、Unit B diode one negative pole is the second terminals.
Electronic switching tube can be MOSFET, it is also possible to be audion, it is also possible to be IGBT etc..
The beneficial effects of the utility model are: can fast and effeciently protect switching tube, prevent overvoltage from damaging, can be with relatively low cost, relatively low switch tube voltage stress, effectively and reliably process the energy conversion of high voltage input.
Accompanying drawing explanation
The utility model will be further described below in conjunction with the accompanying drawings.
Fig. 1 is structure of the present utility model and detection view.
Fig. 2 is structure and the detection state topology schematic diagram of another embodiment of this utility model.
Detailed description of the invention
nullSee accompanying drawing，This utility model one switching tube overvoltage crowbar，Including two independent circuit unit A and B，It is characterized in that: circuit unit A and B of said two independence has identical circuit structure，(as a example by circuit unit A) this circuit structure all includes a transformator T1,The positive pole of secondary coil the first terminating diode two D2 of this transformator T1，The negative pole of this diode two D2 connects one end of electric capacity three C3，Secondary coil second end of another termination transformator T1 of this electric capacity three C3，Primary coil the first termination capacitor two C2 of described transformator T1、Resistance one R1 and electric capacity one C1 the first end,Another terminating diode one D1 negative pole of electric capacity two C2 and resistance one R1，Diode one D1 positive pole and transformator T1 primary coil the second end and the drain electrode of switching tube Q1 also connect，A cell capacitance one C1 the second end connects with first end of unit B electric capacity one C1，A unit transformer T1 secondary coil the second end connects with unit B transformator T1 secondary coil the second end，A cell diodes two D2 positive pole connects with unit B diode two D2 positive pole，A unit switch pipe Q1 source electrode is this protection circuit the first terminals、The drain electrode of unit B switching tube connects this cell capacitance one second end、Unit B diode one D1 negative pole is the second terminals.
Below by described first wiring termination PWM controller, described second wiring termination voltage check device illustrates operation principle of the present utility model.
Operation principle: the control of A unit switch pipe Q1 and unit B switching tube Q1 is both from PWM control, the voltage approximation that A unit switch pipe Q1 and unit B switching tube Q1 switching tube two ends are born, the voltage that unit B switching tube Q1 is born at two ends adds the voltage at unit B electric capacity two C2 two ends equal to the voltage at unit B electric capacity one C1 two ends.The voltage at unit B electric capacity two C2 two ends and the leakage inductance energy in switching tube loop have the biggest relation, and when output short-circuit, the voltage at unit B electric capacity two C2 two ends can drastically raise, and reach the voltage of when normally working 2-3 times, the highest.So we remove to detect the voltage at unit B electric capacity two C2 two ends with a voltage detecting circuit; when the voltage of unit B electric capacity two C2 reaches the value of setting; testing circuit will send off signal and deliver to PWM control end come Pulse by Pulse close PWM driving signal, switching tube Q1, the Q2 being effectively protected in each unit.
A unit is the relation connected with unit B on circuit, and this utility model is not limited to only two unit, can be N number of A unit or the work of unit B circuit connected in series.
Seeing Fig. 2, another embodiment of the present utility model, PWM controller is the control chip of current mode, when current detecting foot detects the signal higher than certain level, can close the output of PWM.When the voltage sampling of C4 is higher than the VREF of comparator inverting input, and comparator output high level signal delivers to the current detecting foot of pwm chip, close the output of PWM, thus be effectively protected the value of the voltage stress not higher than setting of switching tube.
Claims (1)
- null1. a switching tube overvoltage crowbar，Circuit unit A and B including at least two independence，It is characterized in that: circuit unit A and B of said two independence has identical circuit structure，This circuit structure all includes a transformator,The positive pole of secondary coil first terminating diode two of this transformator，The negative pole of this diode two connects one end of electric capacity three，Secondary coil second end of another termination transformator of this electric capacity three，Primary coil first termination capacitor two of described transformator、Resistance one and electric capacity one first end,Another terminating diode one negative pole of electric capacity two and resistance one，Diode one positive pole and primary transformer coil the second end and the drain electrode of switching tube also connect，A cell capacitance one second end connects with the first end of unit B electric capacity one，A unit transformer secondary coil the second end connects with unit B secondary transformer the second end，A cell diodes two positive pole connects with unit B diode two positive pole，A unit switch pipe source electrode is this protection circuit the first terminals、The drain electrode of unit B switching tube connects this cell capacitance one second end、Unit B diode one negative pole is the second terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620188031.9U CN205453654U (en) | 2016-03-13 | 2016-03-13 | Switch tube overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620188031.9U CN205453654U (en) | 2016-03-13 | 2016-03-13 | Switch tube overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205453654U true CN205453654U (en) | 2016-08-10 |
Family
ID=56602594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620188031.9U Expired - Fee Related CN205453654U (en) | 2016-03-13 | 2016-03-13 | Switch tube overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205453654U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294390A (en) * | 2017-07-27 | 2017-10-24 | 郑州瑞能电源技术有限公司 | Two-in-series circuit of reversed excitation |
-
2016
- 2016-03-13 CN CN201620188031.9U patent/CN205453654U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294390A (en) * | 2017-07-27 | 2017-10-24 | 郑州瑞能电源技术有限公司 | Two-in-series circuit of reversed excitation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190108 Address after: 518000 Asian Industrial Park, Fengmen Road, Bantian Street, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Huayi Electric Co.,Ltd. Address before: 518000 East 17th Floor, Xincheng Building, Shennan Middle Road, Futian District, Shenzhen City, Guangdong Province Patentee before: Huang Nifen |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160810 |