CN204517360U - Excess voltage protection - Google Patents
Excess voltage protection Download PDFInfo
- Publication number
- CN204517360U CN204517360U CN201520156746.1U CN201520156746U CN204517360U CN 204517360 U CN204517360 U CN 204517360U CN 201520156746 U CN201520156746 U CN 201520156746U CN 204517360 U CN204517360 U CN 204517360U
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- CN
- China
- Prior art keywords
- resistance
- branch road
- triode
- earth point
- holding wire
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- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of excess voltage protection, comprise DC supply input, earth point, triode and overvoltage holding wire.The first voltage stabilizing didoe, the second voltage stabilizing didoe, the first resistance and the second resistance is adopted to form voltage detecting circuit; when DC supply input voltage is higher than certain value; triode ON; overvoltage holding wire connects power management IC; power management IC can carry out powered-down according to the conducting of overvoltage holding wire; reach the object of overvoltage protection, prevent late-class circuit from damaging.Advantage of the present utility model and beneficial effect are: provide a kind of excess voltage protection, and whether it can detect input voltage higher than rated range.
Description
Technical field
The utility model relates to excess voltage protection.
Background technology
The overvoltage protection of existing DC power supply has much room for improvement.
Utility model content
The purpose of this utility model is to provide a kind of excess voltage protection, and whether it can detect input voltage higher than rated range.
For achieving the above object, the technical solution of the utility model is a kind of excess voltage protection of design, comprises DC supply input, earth point, triode and overvoltage holding wire;
Described DC supply input connects earth point by the first branch road;
Described first branch road is in series with the first voltage stabilizing didoe, the second voltage stabilizing didoe, the first resistance and the second resistance successively by DC supply input to earth point;
Described second resistance two ends are also parallel with the first electric capacity;
The base stage of described triode connects the first branch road; The tie point of described transistor base and the first branch road is between the first resistance and the second resistance;
The emitter of described triode connects earth point;
The collector electrode of described triode connects earth point by the second branch road; Described second branch road is provided with the second electric capacity;
Described overvoltage holding wire connects the collector electrode of NPN triode.
Advantage of the present utility model and beneficial effect are: provide a kind of excess voltage protection, and whether it can detect input voltage higher than rated range.
Principle: adopt the first voltage stabilizing didoe, the second voltage stabilizing didoe, the first resistance and the second resistance to form voltage detecting circuit; when DC supply input voltage is higher than certain value; triode ON; overvoltage holding wire connects power management IC; power management IC can carry out powered-down according to the conducting of overvoltage holding wire; reach the object of overvoltage protection, prevent late-class circuit from damaging.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection range of the present utility model with this.
The technical scheme that the utility model is specifically implemented is:
As shown in Figure 1, a kind of excess voltage protection, comprises DC supply input INPUT+, earth point AGND, triode Q1 and overvoltage holding wire VO;
Described DC supply input INPUT+ connects earth point AGND by the first branch road;
Described first branch road is in series with the first voltage stabilizing didoe ZD1, the second voltage stabilizing didoe ZD2, the first resistance R1 and the second resistance R2 successively by DC supply input INPUT+ to earth point AGND;
Described second resistance R2 two ends are also parallel with the first electric capacity C1;
The base stage B of described triode Q1 connects the first branch road; The tie point of described triode Q1 base stage B and the first branch road is between the first resistance R1 and the second resistance R2;
The emitter E of described triode Q1 connects earth point AGND;
The collector electrode C of described triode Q1 connects earth point AGND by the second branch road; Described second branch road is provided with the second electric capacity C2;
Described overvoltage holding wire connects the collector electrode C of NPN triode Q1.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (1)
1. excess voltage protection, is characterized in that, comprises DC supply input, earth point, triode and overvoltage holding wire;
Described DC supply input connects earth point by the first branch road;
Described first branch road is in series with the first voltage stabilizing didoe, the second voltage stabilizing didoe, the first resistance and the second resistance successively by DC supply input to earth point;
Described second resistance two ends are also parallel with the first electric capacity;
The base stage of described triode connects the first branch road; The tie point of described transistor base and the first branch road is between the first resistance and the second resistance;
The emitter of described triode connects earth point;
The collector electrode of described triode connects earth point by the second branch road; Described second branch road is provided with the second electric capacity;
Described overvoltage holding wire connects the collector electrode of NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520156746.1U CN204517360U (en) | 2015-03-19 | 2015-03-19 | Excess voltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520156746.1U CN204517360U (en) | 2015-03-19 | 2015-03-19 | Excess voltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204517360U true CN204517360U (en) | 2015-07-29 |
Family
ID=53715296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520156746.1U Expired - Fee Related CN204517360U (en) | 2015-03-19 | 2015-03-19 | Excess voltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204517360U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494970A (en) * | 2018-12-27 | 2019-03-19 | 北京金风科创风电设备有限公司 | IGBT (insulated Gate Bipolar transistor) driving circuit, control method thereof and converter |
-
2015
- 2015-03-19 CN CN201520156746.1U patent/CN204517360U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494970A (en) * | 2018-12-27 | 2019-03-19 | 北京金风科创风电设备有限公司 | IGBT (insulated Gate Bipolar transistor) driving circuit, control method thereof and converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20150729 Termination date: 20190319 |