CN105024564A - CS short-circuit protection circuit of switching power supply - Google Patents
CS short-circuit protection circuit of switching power supply Download PDFInfo
- Publication number
- CN105024564A CN105024564A CN201410168038.XA CN201410168038A CN105024564A CN 105024564 A CN105024564 A CN 105024564A CN 201410168038 A CN201410168038 A CN 201410168038A CN 105024564 A CN105024564 A CN 105024564A
- Authority
- CN
- China
- Prior art keywords
- short
- circuit
- power supply
- switching power
- electronic switch
- 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.)
- Pending
Links
Abstract
The invention discloses a CS short-circuit protection circuit of a switching power supply. The CS short-circuit protection circuit comprises an electronic switch and a comparator. Power supply voltage is accessed to the input end of the electronic switch and one input end of the comparator via a protection resistor. Reference voltage is accessed to the other input end of the comparator. The CS short-circuit protection circuit is simple in structure, low in cost, low in power consumption and easy to carry out, and short-circuit protection is high in response speed and high in reliability.
Description
Technical field
The present invention relates to a kind of short-circuit protection circuit, particularly a kind of CS short-circuit protection circuit of Switching Power Supply, belongs to integrated circuit fields.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, and maintain a kind of power supply of regulated output voltage, Switching Power Supply is generally made up of pulse width modulation control integration circuit and power insulated gate pole field-effect transistor.The high reliability of Switching Power Supply is mainly reflected in useful life and output overcurrent, output short circuit protection function.Protective circuit major part popular is at present two opto-coupled feedback circuit, to realize ideal defencive function, but its complex structure, relative cost is higher, and its power consumption is higher.
Summary of the invention
For the shortcoming of prior art, the object of the present invention is to provide a kind of CS short-circuit protection circuit of Switching Power Supply, not only structure is simple, easy to implement, and reliability is high, low in energy consumption.
For achieving the above object, present invention employs 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 of described comparator access reference voltage; 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 relies on CS end current sampling resistor over the ground to control; If but CS holds shorted to earth, then and electric current cannot be sampled, and electronic switch can conducting all the time, causes damaging, now judges size of current by electronic switch drain voltage, be greater than reference voltage, be just judged to be output short circuit, enter guard mode.
Compared with prior art, beneficial effect of the present invention comprises: structure of the present invention is simple, and cost is low, low in energy consumption, easy to implement, and its short-circuit protection fast response time, reliability is high.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the CS short-circuit protection circuit of the embodiment of the present invention 1 breaker in middle power supply.
Embodiment
In view of the defect of prior art, the present invention aims to provide a kind of CS short-circuit protection circuit of Switching Power Supply, and not only structure is simple, easy to implement, and reliability is high, low in energy consumption.
As one of viable solution of the present invention; 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 of described comparator access reference voltage; 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, more specific detail is done to technical scheme of the present invention.
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, and metal-oxide-semiconductor Q drains and comparator U mono-input meets power supply P through protective resistance F, another input of comparator access reference voltage V
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 relies on CS end current sampling resistor R over the ground to control; If but CS holds shorted to earth, then and electric current cannot be sampled, and metal-oxide-semiconductor Q can conducting all the time, causes damaging, now judges size of current by metal-oxide-semiconductor Q drain voltage, be greater than reference voltage V
cSS, be just judged to be output short circuit, enter guard mode.
In addition to the implementation, the present invention 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 application claims.
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 of described comparator access reference voltage; 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 |
|---|---|---|---|
| CN201410168038.XA CN105024564A (en) | 2014-04-24 | 2014-04-24 | CS short-circuit protection circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410168038.XA CN105024564A (en) | 2014-04-24 | 2014-04-24 | CS short-circuit protection circuit of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105024564A true CN105024564A (en) | 2015-11-04 |
Family
ID=54414332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410168038.XA Pending CN105024564A (en) | 2014-04-24 | 2014-04-24 | CS short-circuit protection circuit of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105024564A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425738A (en) * | 2016-05-23 | 2017-12-01 | 立锜科技股份有限公司 | Power supply changeover device, its control circuit and current sensing resistor short circuit determination method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080192396A1 (en) * | 2007-02-08 | 2008-08-14 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Over-voltage protection circuit and method thereof |
| CN203180783U (en) * | 2013-04-12 | 2013-09-04 | 深圳市海洋王照明工程有限公司 | Boosted circuit |
| CN203800836U (en) * | 2014-04-24 | 2014-08-27 | 苏州华芯微电子股份有限公司 | CS short circuit protection circuit for switch power supply |
| CN104218533A (en) * | 2014-10-09 | 2014-12-17 | 上海斐讯数据通信技术有限公司 | Power input overvoltage turn-off protection circuit |
-
2014
- 2014-04-24 CN CN201410168038.XA patent/CN105024564A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080192396A1 (en) * | 2007-02-08 | 2008-08-14 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Over-voltage protection circuit and method thereof |
| CN203180783U (en) * | 2013-04-12 | 2013-09-04 | 深圳市海洋王照明工程有限公司 | Boosted circuit |
| CN203800836U (en) * | 2014-04-24 | 2014-08-27 | 苏州华芯微电子股份有限公司 | CS short circuit protection circuit for switch power supply |
| CN104218533A (en) * | 2014-10-09 | 2014-12-17 | 上海斐讯数据通信技术有限公司 | Power input overvoltage turn-off protection circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425738A (en) * | 2016-05-23 | 2017-12-01 | 立锜科技股份有限公司 | Power supply changeover device, its control circuit and current sensing resistor short circuit determination method |
| CN107425738B (en) * | 2016-05-23 | 2019-07-05 | 立锜科技股份有限公司 | Power adapter, its control circuit and current sensing resistor short circuit determination method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105406846B (en) | A kind of power tube drive control circuit suitable for solid-state power controller | |
| CN104052303A (en) | Undisturbed switching mechanism of voltage-stabilization electricity-saving device | |
| CN103825436B (en) | A kind of power field effect tube drive circuit of high speed big current | |
| CN103595016A (en) | Current-limiting protection circuit | |
| CN101841183A (en) | Power supply switching circuit | |
| CN203313043U (en) | Negative-voltage drive circuit of high-frequency MOSFET | |
| CN202602609U (en) | Direct current solid-state relay | |
| CN202330630U (en) | Detecting circuit for current and working condition of MOS (Metal Oxide Semiconductor) tube | |
| CN203800836U (en) | CS short circuit protection circuit for switch power supply | |
| CN203504407U (en) | Igbt drive circuit and electric pressure cooker | |
| CN105024564A (en) | CS short-circuit protection circuit of switching power supply | |
| CN108809069A (en) | A kind of monocycle peak current limit circuit | |
| CN202218012U (en) | Power supply having reversal connection protection function | |
| CN205791490U (en) | Switching tube current-limiting protection circuit | |
| CN109327197A (en) | A kind of control circuit of depletion type GaN-HEMT power amplifier | |
| CN210404712U (en) | Undervoltage on/off switch circuit | |
| CN204031110U (en) | Electronic DC switch and electronic equipment | |
| CN208675103U (en) | A kind of monocycle peak current limit circuit | |
| CN203813431U (en) | Current limiting protection circuit based on MOS tube grid voltage control | |
| CN202145638U (en) | High voltage simulation switch circuit | |
| CN206332608U (en) | A kind of IGBT resistances adjusted circuit | |
| CN203734516U (en) | MOSFET isolation drive circuit | |
| CN204425178U (en) | ON-OFF control circuit | |
| CN204030562U (en) | A kind of under-voltage protecting circuit of Switching Power Supply | |
| CN204131378U (en) | For the PWM dead band absorbing circuit of driving transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151104 |