CN203800836U - CS short circuit protection circuit for switch power supply - Google Patents
CS short circuit protection circuit for switch power supply Download PDFInfo
- Publication number
- CN203800836U CN203800836U CN201420204012.1U CN201420204012U CN203800836U CN 203800836 U CN203800836 U CN 203800836U CN 201420204012 U CN201420204012 U CN 201420204012U CN 203800836 U CN203800836 U CN 203800836U
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- China
- Prior art keywords
- power supply
- electronic switch
- protection circuit
- short
- comparator
- Prior art date
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- Expired - Lifetime
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- 239000004065 semiconductor Substances 0.000 claims description 11
- 230000005669 field effect Effects 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a CS short circuit protection circuit for a switch power supply, comprising an electronic switch and a comparator; the input terminal of the electronic switch and one input terminal of the comparator are connected to power supply voltage through a protection resistor; and the other input terminal of the comparator is connected to standard voltage. The CS short circuit protection circuit for switch power supply is simple in structure, low in cost and power consumption, and easy to implement. The response speed of the protection circuit is quick and high in reliability.
Description
Technical field
The utility model relates to a kind of short-circuit protection circuit, and particularly a kind of CS short-circuit protection circuit of Switching Power Supply, belongs to integrated circuit fields.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that control switch pipe turns on and off maintains a kind of power supply of regulated output voltage, and Switching Power Supply generally consists of pulse width modulation control integration circuit and power insulated gate utmost point field-effect transistor.The high reliability of Switching Power Supply is mainly reflected in useful life and output overcurrent, output short circuit protection function.Popular protective circuit major part is two optocoupler feedback circuits at present, to realize comparatively desirable defencive function, but its complex structure, relative cost is higher, and its power consumption is higher.
Utility model content
For the shortcoming of prior art, the purpose of this utility model is to provide a kind of CS short-circuit protection circuit of Switching Power Supply, not only simple in structure, easy to implement, and reliability is high, low in energy consumption.
For realizing above-mentioned utility model object, the utility model has adopted following technical scheme:
A kind of CS short-circuit protection circuit of Switching Power Supply; it comprises electronic switch and comparator; described electronic switch input and described comparator one input are through a protective resistance access supply voltage; another input access reference voltage of described comparator; described electronic switch output is CS end, and through a current sampling resistor ground connection.
Further, described electronic switch adopts field-effect transistor, and described field-effect transistor drain electrode is input, and source electrode is output.
As one of comparatively preferred embodiment, described field-effect transistor adopts N-type metal-oxide-semiconductor.
Operation principle: when circuit is normal, the shutoff of electronic switch is to rely on CS end current sampling resistor over the ground to control; If but CS end shorted to earth, electric current cannot be sampled, and electronic switch is conducting all the time, causes damaging, and now by electronic switch drain voltage, judges size of current, is greater than reference voltage, is just judged to be output short circuit, enters guard mode.
Compared with prior art, the beneficial effects of the utility model comprise: the utility model is simple in structure, and cost is low, low in energy consumption, easy to implement, its short-circuit protection fast response time, and reliability is high.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the CS short-circuit protection circuit of Switching Power Supply in the utility model embodiment 1.
Embodiment
In view of the defect of prior art, the utility model aims to provide a kind of CS short-circuit protection circuit of Switching Power Supply, not only simple in structure, easy to implement, and reliability is high, low in energy consumption.
As one of feasible embodiment of the present utility model; the CS short-circuit protection circuit of this Switching Power Supply; it comprises electronic switch and comparator; described electronic switch input and described comparator one input are through a protective resistance access supply voltage; another input access reference voltage of described comparator; described electronic switch output is CS end, and through a current sampling resistor ground connection.
Further, described electronic switch adopts field-effect transistor, and described field-effect transistor drain electrode is input, and source electrode is output.
As one of comparatively preferred embodiment, described field-effect transistor adopts N-type metal-oxide-semiconductor.
Below in conjunction with accompanying drawing and an embodiment, the technical solution of the utility model is done to more specific detail.
The CS short-circuit protection circuit that embodiment 1 consults this Switching Power Supply of Fig. 1 comprises metal-oxide-semiconductor Q and comparator U; metal-oxide-semiconductor Q drain electrode and comparator U mono-input meet power supply P through protective resistance F; another input access reference voltage V of comparator css; metal-oxide-semiconductor Q source electrode is held as CS, and through current sampling resistor R ground connection.
Wherein, metal-oxide-semiconductor is N-type metal-oxide-semiconductor.
Operation principle: when circuit is normal, the shutoff of metal-oxide-semiconductor Q is to rely on CS end current sampling resistor R over the ground to control; If but CS end shorted to earth, electric current cannot be sampled, and metal-oxide-semiconductor Q conducting all the time causes damaging, and now by metal-oxide-semiconductor Q drain voltage, judges size of current, is greater than reference voltage V css, is just judged to be output short circuit, enters guard mode.
In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (3)
1. the CS short-circuit protection circuit of a Switching Power Supply; it is characterized in that; it comprises electronic switch and comparator; described electronic switch input and described comparator one input are through a protective resistance access supply voltage; another input access reference voltage of described comparator; described electronic switch output is CS end, and through a current sampling resistor ground connection.
2. the CS short-circuit protection circuit of Switching Power Supply according to claim 1, is characterized in that, described electronic switch adopts field-effect transistor, and described field-effect transistor drain electrode is input, and source electrode is output.
3. the CS short-circuit protection circuit of Switching Power Supply according to claim 2, is characterized in that, described field-effect transistor adopts N-type metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420204012.1U CN203800836U (en) | 2014-04-24 | 2014-04-24 | CS short circuit protection circuit for switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420204012.1U CN203800836U (en) | 2014-04-24 | 2014-04-24 | CS short circuit protection circuit for switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203800836U true CN203800836U (en) | 2014-08-27 |
Family
ID=51383020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420204012.1U Expired - Lifetime CN203800836U (en) | 2014-04-24 | 2014-04-24 | CS short circuit protection circuit for switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203800836U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024564A (en) * | 2014-04-24 | 2015-11-04 | 苏州华芯微电子股份有限公司 | CS short-circuit protection circuit of switching power supply |
| US10367348B2 (en) | 2015-11-26 | 2019-07-30 | Byd Company Limited | Switch-mode power supply and control having protection from a short-circuited current sensing resistor |
-
2014
- 2014-04-24 CN CN201420204012.1U patent/CN203800836U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024564A (en) * | 2014-04-24 | 2015-11-04 | 苏州华芯微电子股份有限公司 | CS short-circuit protection circuit of switching power supply |
| US10367348B2 (en) | 2015-11-26 | 2019-07-30 | Byd Company Limited | Switch-mode power supply and control having protection from a short-circuited current sensing resistor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |
|
| CX01 | Expiry of patent term | ||
| DD01 | Delivery of document by public notice |
Addressee: SUZHOU HUAXIN MICRO-ELECTRONICS Co.,Ltd. Person in charge of patents Document name: Notice of Termination of Patent Rights |
|
| DD01 | Delivery of document by public notice |