CN204349420U - Power protecting circuit and electronic equipment - Google Patents
Power protecting circuit and electronic equipment Download PDFInfo
- Publication number
- CN204349420U CN204349420U CN201420871775.1U CN201420871775U CN204349420U CN 204349420 U CN204349420 U CN 204349420U CN 201420871775 U CN201420871775 U CN 201420871775U CN 204349420 U CN204349420 U CN 204349420U
- Authority
- CN
- China
- Prior art keywords
- resistance
- diode
- power
- circuit
- voltage
- 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.)
- Expired - Fee Related
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of power protecting circuit, described power protecting circuit comprises and controls control chip that whether electronic equipment power, for the rectification circuit of rectification, for the voltage sampling circuit of sampling to the voltage after rectification and the accumulator for energy storage for output drive signal; Wherein, the power input of described control chip is electrically connected with described accumulator; Described voltage sampling circuit is electrically connected with the overcurrent protection end of described rectification circuit, described power input and described control chip respectively; And described voltage sampling circuit controls signal to described overcurrent protection end, to control the state that described control chip exports described drive singal accordingly according to the voltage swing output of the voltage of sampling and described power input.The invention also discloses a kind of electronic equipment.The utility model improves the stability of electronic device works.
Description
Technical field
The utility model relates to power technique fields, particularly relates to power protecting circuit and electronic equipment.
Background technology
As everyone knows, Voltage Drop refers to that the amplitude of at a time voltage departs from normal range of operation suddenly, returns to again the phenomenon of normal level after very short a period of time.Atrocious weather condition (as thunderbolt, storm) is the main cause causing Voltage Drop.If electronic equipment continues normal work when Voltage Drop, by energy-storage travelling wave tube (as the electric capacity) electric discharge caused in electronic equipment, to maintain the normal work of electronic equipment, now abnormal by causing the system of electronic equipment to occur, affect the stability of electronic device works.
Foregoing only understands the technical solution of the utility model for auxiliary, does not represent and admits that foregoing is prior art.
Utility model content
Main purpose of the present utility model is to provide a kind of power protecting circuit and electronic equipment, is intended to the stability improving electronic device works.
To achieve these goals, the utility model provides a kind of power protecting circuit, and described power protecting circuit comprises and controls control chip that whether electronic equipment power, for the rectification circuit of rectification, for the voltage sampling circuit of sampling to the voltage after rectification and the accumulator for energy storage for output drive signal;
Wherein, the power input of described control chip is electrically connected with described accumulator;
Described voltage sampling circuit is electrically connected with the overcurrent protection end of described rectification circuit, described power input and described control chip respectively; And described voltage sampling circuit controls signal to described overcurrent protection end, to control the state that described control chip exports described drive singal accordingly according to the voltage swing output of the voltage of sampling and described power input.
Preferably, described voltage sampling circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity, the second electric capacity, the first diode and electronic switch;
One end of described first resistance is connected with the output of described rectification circuit, and the other end is by the second grounding through resistance;
Described first electric capacity and the first diode are all parallel to the two ends of described second resistance, and described first diode is voltage stabilizing didoe, the plus earth of described first diode;
One end of described 3rd resistance is by described 4th grounding through resistance, and the other end is connected with described power input by described electronic switch;
Described second Capacitance parallel connection is in the two ends of described 4th resistance;
The control end of described electronic switch is connected to the common port of described first resistance and the second resistance.
Preferably, described electronic switch is triode, and described triode is PNP triode, and the emitter of described triode is connected with described power input, and collector electrode is connected with described 3rd resistance, and base stage is connected to the common port of described first resistance and the second resistance.
Preferably, described voltage sampling circuit also comprises the second diode, and the base stage of described triode is connected with the common port of described first resistance and the second resistance by described second diode, and the anode of described triode is connected with the base stage of described triode.
Preferably, described first resistance is made up of the resistance that at least two are connected successively.
Preferably, described rectification circuit comprises the 3rd diode and the 4th diode, the negative electrode of wherein said 3rd diode is connected with the negative electrode of described 4th diode, and the anode of described 3rd diode is connected with the live wire of civil power, and the anode of described 4th diode is connected with the zero line of civil power.
Preferably, described accumulator comprises the 3rd electric capacity and the 4th electric capacity, and one end of described 3rd electric capacity is connected with described power input, other end ground connection; Described 4th Capacitance parallel connection is in the two ends of described 3rd electric capacity.
Preferably, described control chip is FA8A00N.
In addition, for achieving the above object, the utility model also provides a kind of electronic equipment, and this electronic equipment comprises power protecting circuit; Described power protecting circuit comprises and controls control chip that whether electronic equipment power, for the rectification circuit of rectification, for the voltage sampling circuit of sampling to the voltage after rectification and the accumulator for energy storage for output drive signal;
Wherein, the power input of described control chip is electrically connected with described accumulator;
Described voltage sampling circuit is electrically connected with the overcurrent protection end of described rectification circuit, described power input and described control chip respectively; And described voltage sampling circuit controls signal to described overcurrent protection end, to control the state that described control chip exports described drive singal accordingly according to the voltage swing output of the voltage of sampling and described power input.
The utility model embodiment controls signal to described overcurrent protection end CS, to control the state that described control chip 10 exports described drive singal by voltage sampling circuit 30 accordingly according to the voltage swing output of the voltage of sampling and described power input VCC; Thus achieve low-voltage variation, prevent because under low-pressure state, electronic equipment continuous firing leads to system abnormity.Therefore the power protecting circuit that provides of the utility model and electronic equipment can improve the stability of electronic device works.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model power protecting circuit preferred embodiment.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of power protecting circuit, with reference to Fig. 1, in one embodiment, this power protecting circuit comprises and controls control chip 10 that whether electronic equipment power, for the rectification circuit 20 of rectification, for the voltage sampling circuit 30 of sampling to the voltage after rectification and the accumulator 40 for energy storage for output drive signal;
Wherein, the power input VCC of described control chip 10 is electrically connected with described accumulator 40;
Described voltage sampling circuit 30 is electrically connected with the overcurrent protection end CS of described rectification circuit 20, described power input VCC and described control chip 10 respectively; And described voltage sampling circuit 30 controls signal to described overcurrent protection end CS, to control the state that described control chip 10 exports described drive singal accordingly according to the voltage swing output of the voltage of sampling and described power input VCC.
The power protecting circuit that the present embodiment provides is for the process in power-supply system during power supply power-fail.Particularly, this power supply can be civil power, and above-mentioned rectification circuit 20 is for carrying out full-wave rectification to civil power.Above-mentioned control chip 10, for having the chip of overcurrent protection function, such as, in the present embodiment, is preferably FA8A00N; This control chip 10 has drive singal output function, this drive singal is preferably pulse-width signal, this drive singal can export as in electronic equipment for controlling the switching tube of preset transformer switch, whether to control the on off state of this switching tube, thus to realize civil power be power electronic equipment.
It should be noted that above-mentioned voltage sampling circuit 30 carries out sampling for the voltage exported rectification circuit 20 rectification and obtains a sampled voltage.Under civil power normal condition, the sampled voltage that voltage sampling circuit 30 obtains is first threshold; Now, voltage sampling circuit 30 by output one level signal to the overcurrent protection end CS of control chip 10, control chip 10 will enter normal operating conditions according to this level signal, and export the pulse-width signal of preset duty cycle by the signal output pin OUT of control chip 10; Thus electronic equipment is electrically connected with city, normally work.When line voltage drops into preset value; when the sampled voltage that voltage sampling circuit 30 is obtained is Second Threshold; voltage sampling circuit 30 will export the overcurrent protection end CS of another level signal to control chip 10; control chip 10 will stop exporting above-mentioned pulse-width signal according to this level signal control signal output pin OUT; thus electronic equipment and civil power are disconnected, quit work.
The utility model embodiment controls signal to described overcurrent protection end CS, to control the state that described control chip 10 exports described drive singal by voltage sampling circuit 30 accordingly according to the voltage swing output of the voltage of sampling and described power input VCC; Thus achieve low-voltage variation, prevent because under low-pressure state, electronic equipment continuous firing leads to system abnormity.Therefore the power protecting circuit that the utility model provides can improve the stability of electronic device works.
Particularly, based on above-described embodiment, in the present embodiment, above-mentioned pressure sample circuit 30 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first electric capacity C1, the second electric capacity C2, the first diode D1 and electronic switch Q;
One end of described first resistance R1 is connected with the output of described rectification circuit 20, and the other end is by the second resistance R2 ground connection;
Described first electric capacity C1 and the first diode D1 is all parallel to the two ends of described second resistance R2, and described first diode D1 is voltage stabilizing didoe, the plus earth of described first diode D1;
One end of described 3rd resistance R3 is by described 4th resistance R4 ground connection, and the other end is connected with described power input VCC by described electronic switch Q;
Described second electric capacity C2 is parallel to the two ends of described 4th resistance R4;
The control end of described electronic switch Q is connected to the common port of described first resistance R1 and the second resistance R2.
It should be noted that the structure of above-mentioned electronic switch Q can be arranged according to actual needs; In the present embodiment, preferably, above-mentioned electronic switch is triode, described triode is PNP triode, the emitter of described triode is connected with described power input, and collector electrode is connected with described 3rd resistance, and base stage is connected to the common port of described first resistance R1 and the second resistance R2.In the present embodiment, owing to adopting triode as electronic switch Q, be reversed to prevent electronic switch and puncture, preferably, above-mentioned voltage sampling circuit 30 also comprises the second diode D2, the base stage of described triode is connected with the common port of described first resistance R1 and the second resistance R2 by described second diode D2, and the anode of described triode is connected with the base stage of described triode.In the present embodiment, the base stage of triode is the control end of electronic switch Q.
Above-mentioned accumulator 40 comprises the 3rd electric capacity C3 and the 4th electric capacity C4, and one end of described 3rd electric capacity C3 is connected with described power input VCC, other end ground connection; Described 4th electric capacity C4 is parallel to the two ends of described 3rd electric capacity C3.
Particularly, above-mentioned rectification circuit 20 comprises the 3rd diode D3 and the 4th diode D4, the negative electrode of wherein said 3rd diode D3 is connected with the negative electrode of described 4th diode D4, the described anode of the 3rd diode D3 is connected with the live wire L of civil power, and the described anode of the 4th diode D4 is connected with the zero line N of civil power.
In the present embodiment, the normal working voltage of above-mentioned control chip 10 is 22V, and namely the voltage of the power input of control chip 10 is 22V.Civil power under normal circumstances, by the voltage after rectification circuit 30 rectification after the first resistance R1 and the second resistance R2 dividing potential drop, obtains the magnitude of voltage of 30V after the first diode D1 voltage stabilizing; Now triode is in cut-off state, and the overcurrent protection pin of control chip 10 is in normal operating conditions, and civil power can bio-occlusion power electronic equipment.When civil power falls; first diode D1 lacks operating current and quits work; first electric capacity C1 is discharged by the second resistance R2; when the Voltage Drop at the second resistance R2 two ends is to about 20.6V; triode is in conducting state; the voltage of this transistor collector raises; after carrying out dividing potential drop by the 3rd resistance R3 and the 4th resistance R4; the current protection end CS of control chip 10 is made to produce the overcurrent protection signal of an about 1.38V; now, control chip 10 will stop at output pulse width modulation signal on signal output part OUT.After city power recovery is normal, triode will be cut off again, thus make control chip again recover normal operating conditions.
It should be noted that above-mentioned first resistance R1 can be a resistance, the resistance also can connected successively by least two is formed.
The utility model also provides a kind of electronic equipment, and this electronic equipment comprises power protecting circuit, and the structure of this power protecting circuit can refer to above-described embodiment, does not repeat them here.Naturally, the electronic equipment due to the present embodiment have employed the technical scheme of above-mentioned power protecting circuit, and therefore this electronic equipment has all beneficial effects of above-mentioned power protecting circuit.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (9)
1. a power protecting circuit, it is characterized in that, comprise and control control chip that whether electronic equipment power, for the rectification circuit of rectification, for the voltage sampling circuit of sampling to the voltage after rectification and the accumulator for energy storage for output drive signal;
Wherein, the power input of described control chip is electrically connected with described accumulator;
Described voltage sampling circuit is electrically connected with the overcurrent protection end of described rectification circuit, described power input and described control chip respectively; And described voltage sampling circuit controls signal to described overcurrent protection end, to control the state that described control chip exports described drive singal accordingly according to the voltage swing output of the voltage of sampling and described power input.
2. power protecting circuit as claimed in claim 1, it is characterized in that, described voltage sampling circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity, the second electric capacity, the first diode and electronic switch;
One end of described first resistance is connected with the output of described rectification circuit, and the other end is by the second grounding through resistance;
Described first electric capacity and the first diode are all parallel to the two ends of described second resistance, and described first diode is voltage stabilizing didoe, the plus earth of described first diode;
One end of described 3rd resistance is by described 4th grounding through resistance, and the other end is connected with described power input by described electronic switch;
Described second Capacitance parallel connection is in the two ends of described 4th resistance;
The control end of described electronic switch is connected to the common port of described first resistance and the second resistance.
3. power protecting circuit as claimed in claim 2; it is characterized in that; described electronic switch is triode; described triode is PNP triode; the emitter of described triode is connected with described power input; collector electrode is connected with described 3rd resistance, and base stage is connected to the common port of described first resistance and the second resistance.
4. power protecting circuit as claimed in claim 3; it is characterized in that; described voltage sampling circuit also comprises the second diode; the base stage of described triode is connected with the common port of described first resistance and the second resistance by described second diode, and the anode of described triode is connected with the base stage of described triode.
5. power protecting circuit as claimed in claim 2, it is characterized in that, described first resistance is made up of the resistance that at least two are connected successively.
6. power protecting circuit as claimed in claim 1; it is characterized in that; described rectification circuit comprises the 3rd diode and the 4th diode; the negative electrode of wherein said 3rd diode is connected with the negative electrode of described 4th diode; the anode of described 3rd diode is connected with the live wire of civil power, and the anode of described 4th diode is connected with the zero line of civil power.
7. power protecting circuit as claimed in claim 1, it is characterized in that, described accumulator comprises the 3rd electric capacity and the 4th electric capacity, and one end of described 3rd electric capacity is connected with described power input, other end ground connection; Described 4th Capacitance parallel connection is in the two ends of described 3rd electric capacity.
8. power protecting circuit as claimed in claim 1, it is characterized in that, described control chip is FA8A00N.
9. an electronic equipment, is characterized in that, comprises the power protecting circuit according to any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420871775.1U CN204349420U (en) | 2014-12-31 | 2014-12-31 | Power protecting circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420871775.1U CN204349420U (en) | 2014-12-31 | 2014-12-31 | Power protecting circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349420U true CN204349420U (en) | 2015-05-20 |
Family
ID=53232663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420871775.1U Expired - Fee Related CN204349420U (en) | 2014-12-31 | 2014-12-31 | Power protecting circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349420U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107493009A (en) * | 2017-08-25 | 2017-12-19 | 浙江凯耀照明股份有限公司 | Multi-functional expansion protection circuit |
-
2014
- 2014-12-31 CN CN201420871775.1U patent/CN204349420U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107493009A (en) * | 2017-08-25 | 2017-12-19 | 浙江凯耀照明股份有限公司 | Multi-functional expansion protection circuit |
| CN107493009B (en) * | 2017-08-25 | 2023-08-25 | 浙江凯耀照明股份有限公司 | Multifunctional expansion protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202384752U (en) | Switching power supply overcurrent protection circuit | |
| CN102361319B (en) | IGBT (Insulated Gate Bipolar Translator) short circuit protection detection circuit based on driving chip | |
| CN101436771A (en) | Power supply under-voltage protection circuit and power supply comprising same | |
| CN104218531A (en) | Short circuit protecting circuit and method | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN205070404U (en) | Short -circuit protection circuit and switching power supply circuit | |
| CN202333786U (en) | Drive circuit for restraining IGBT (Insulated Gate Bipolar Transistor) overcurrent | |
| CN203368840U (en) | LED driving circuit and LED display device | |
| CN203596738U (en) | Switch power supply output overvoltage protection circuit | |
| CN204349420U (en) | Power protecting circuit and electronic equipment | |
| CN202772791U (en) | Short circuit protection circuit used for parallel connection power supply | |
| CN201839197U (en) | Overvoltage and undervoltage protection and locking circuit for drive voltage of IGBT (insulated gate bipolar transistor) | |
| CN208753976U (en) | A kind of under-voltage protecting circuit with lag function | |
| CN204362014U (en) | Drive circuit and electronic equipment | |
| CN203911883U (en) | Driving circuit of switch element | |
| CN203415942U (en) | Fault signal processing circuit | |
| CN202797873U (en) | Light-emitting diode (LED) short-circuit protection circuit | |
| CN202978239U (en) | IGBT straight-through overcurrent protection circuit | |
| CN102025140B (en) | Polymeric positive temperature coefficient (PPTC) overcurrent protection module and electronic products | |
| CN203339686U (en) | Constant current source short circuit protection inhibition circuit | |
| CN205070778U (en) | Voltage spike snubber circuit and switching power supply circuit | |
| CN205092571U (en) | Direct current transient state surge voltage suppression circuit based on PMOS pipe | |
| CN203932956U (en) | A kind of high-current relay Drive Protecting Circuit | |
| CN203800836U (en) | CS short circuit protection circuit for switch power supply | |
| CN202888807U (en) | Overcurrent protection circuit and switch power supply for half-bridge circuit |
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: 20150520 Termination date: 20161231 |