CN101364730A - Input voltage protection circuit - Google Patents
Input voltage protection circuit Download PDFInfo
- Publication number
- CN101364730A CN101364730A CNA2008100675957A CN200810067595A CN101364730A CN 101364730 A CN101364730 A CN 101364730A CN A2008100675957 A CNA2008100675957 A CN A2008100675957A CN 200810067595 A CN200810067595 A CN 200810067595A CN 101364730 A CN101364730 A CN 101364730A
- Authority
- CN
- China
- Prior art keywords
- voltage
- resistance
- input voltage
- power supply
- operational amplifier
- 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.)
- Granted
Links
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000009977 dual effect Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses an input voltage protection circuit, which comprises a power supply circuit section for providing a power supply, a sampling section for sampling an external input voltage, a reference section connected with the power supply circuit section for generating a low-lower-limit comparison reference voltage Vlow and a high-upper-limit comparison reference voltage Vhigh, and a comparison and output section connected with the sampling section and the reference section for comparing the sampling voltage with the low-lower-limit comparison reference voltage Vlow and the high-upper-limit comparison reference voltage Vhigh and generating a control signal to control an electric device. Accordingly, the external input voltage sampled by the sampling section is compared with the high-upper-limit (Vhigh) and the low-lower-limit (Vlow) reference voltage, and a control voltage signal is outputted to stop the operation of the internal circuit of the electric device, so that the input voltage protection circuit can effectively achieve protection of the entire circuit of the electric device.
Description
[technical field]
The present invention relates to power technique fields, particularly a kind of input voltage protection circuit.
[background technology]
Along with the development of tv broadcasting technology and the raising of people's living standard, TV has spread to huge numbers of families, becomes one of consumer goods main in people's life, has brought convenience and enjoyment for people's work, studying and living.Yet, in many remote areas and part impoverished nation, its line voltage instability, higher sometimes, exceeded the television set maximum operating voltage; And on the low side sometimes, be lower than the minimum operating voltage of television set.So line voltage is higher and on the low side, all can influence the operate as normal of power circuit, causes the television set interior power supply circuit to damage easily, when serious even can cause the situation generation that television set catches fire.When especially line voltage is too high, be more prone to cause danger, cause very big economic loss to the consumer, even be in peril of one's life.Provide a kind of technical scheme so be necessary exploitation, it is too high or cross when low the easily problem of infringement television power circuit to solve line voltage.
[summary of the invention]
For addressing the above problem, main purpose of the present invention is to provide a kind of input voltage protection circuit, and to solve when external input voltage is higher or on the low side, power circuit work is undesired, the problem that causes the electric equipment circuit to damage.
For achieving the above object, technical scheme of the present invention is:
A kind of input voltage protection circuit; include power supply circuits part that power supply is provided, sampling external input voltage sampling part, connect the power supply circuits part and link to each other with the reference part that produces low lower limit comparison reference voltage Vlow and high upper limit comparison reference voltage Vhigh and with sampling part, reference part, compare the comparison output of generation control signal with sampled voltage that sampling part is produced and low lower limit comparison reference voltage Vlow and high upper limit comparison reference voltage Vhigh with control apparatus equipment.
Compared to prior art; input voltage protection circuit of the present invention is when externally input voltage is higher or on the low side; by the sampling external input voltage; sampled voltage and the high upper limit (Vhigh) and low lower limit (Vlow) reference voltage are compared; output control voltage signal; by this control signal, can allow the electric equipment internal circuit quit work, thereby realize effective protection the electric equipment circuitry.
[description of drawings]
Fig. 1 is the circuit theory diagrams of input voltage protection circuit of the present invention.
[embodiment]
See also shown in Figure 1, a kind of input voltage protection circuit of the present invention, comprise the external input voltage of sampling sampling part, connect sampling part the comparison output, connect relatively the reference part of output and the power supply circuits part that power supply is provided.Described reference part produces low lower limit comparison reference voltage Vlow and high upper limit comparison reference voltage Vhigh; sampling part is sampled to external input voltage; sampled voltage that sampling part is produced by output relatively and low lower limit comparison reference voltage Vlow and high upper limit comparison reference voltage Vhigh compare; when sampled voltage is lower than lower limit comparison reference voltage Vlow or be higher than high upper limit comparison reference voltage Vhigh; relatively output generation control signal quits work with the control apparatus device power supply (DPS); thereby allow the inside electric appliance circuit quit work, realize effective protection the electric equipment circuitry.
Described sampling part includes rectifier diode D1, four divider resistance R4, R5, R6, R7, and two filter capacitor C4, C5.Wherein, the first filter capacitor C4 is connected between the negative pole and ground of rectifier diode; And the second filter capacitor C5 and resistance R 7 back in parallel ground connection.External input voltage AC is after the filtering of the rectification of rectifier diode D1 and the first filter capacitor C4, produce direct voltage V2, this direct voltage V2 process R4, R5, R6 and four electric resistance partial pressures of R7, and after the second filter capacitor C5 filtering, produce sampled voltage AC Sense.
Relatively output includes dual operational amplifier IC2, and described dual operational amplifier IC2 inside comprises two independently operational amplifiers, is respectively first, second operational amplifier IC2A, IC2B.Wherein, the output of first, second operational amplifier IC2A, IC2B is connected to current-limiting resistance R8 by first, second diode D2, D3 respectively, through the coupling metering function of resistance R 8, produces direct-current control voltage signal DC Sense.In the present embodiment, described dual operational amplifier IC2 is LM2904.
Power supply circuits partly include resistance R 1, first, second filter capacitor C1, the C2 of direct connection direct current supply voltage vcc, two divider resistance R1, R9 and voltage stabilizing didoe IC1.Wherein, the direct current supply voltage vcc is through the dividing potential drop effect of resistance R 1, R2, R9, and the filtering of first, second filter capacitor C1, C2, by voltage stabilizing didoe IC1 silicon controlled pressure stabilization function, produce stable supply power voltage V1, give the relatively dual operational amplifier IC2 power supply of output.The pin that a branch road is connected to voltage stabilizing didoe IC1 is drawn in two divider resistance R1, R9 series connection and its centre, can change the height of V1 voltage by the resistance parameter of adjusting resistance R 1 and R9.The supply power voltage V1 that power supply circuits partly produce is divided into three branch roads, the one branch road is connected to the inverting input of the second operational amplifier IC2B of comparison output, as high upper limit comparison reference voltage Vhigh, and other two branch roads are connected to reference part and first operational amplifier that compares output respectively, hang down lower limit comparison reference voltage Vlow to produce, and provide power supply for comparing output by the reference part circuit.
Reference part includes two divider resistance R3, R10 and the filter capacitor C3 in parallel with R10.Supply power voltage V1 is through the dividing potential drop of resistance R 3 and R10, and the filtering of capacitor C 3, produces low lower limit comparison reference voltage Vlow, is connected to the first operational amplifier in-phase input end of comparison output.
The sampled voltage AC Sense that sampling part produces is connected to first, second operational amplifier IC2A, IC2B inverting input and the in-phase input end of dual operational amplifier IC2 respectively.When AC Sense was lower than Vlow, the IC2A of dual operational amplifier IC2 exported positive voltage, made through the coupling metering function of resistance R 8, to produce direct-current control voltage signal DC Sense by diode D2 forward conduction.And when AC Sense was higher than Vhigh, the second operational amplifier IC2B of dual operational amplifier IC2 exported positive voltage, made through the coupling metering function of resistance R 8, to produce direct-current control voltage signal DC Sense by diode D3 forward conduction.This direct-current control voltage signal DC Sense can input to MCU power control circuits such as (microcontrollers), quits work with the control apparatus device power supply (DPS), realizes the effective protection to the electric equipment circuitry.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (7)
1. input voltage protection circuit; including provides the power supply circuits of power supply part; it is characterized in that: also include the sampling external input voltage sampling part, connect the power supply circuits part and link to each other with the reference part that produces low lower limit comparison reference voltage Vlow and high upper limit comparison reference voltage Vhigh and with sampling part, reference part, compare the comparison output of generation control signal with sampled voltage that sampling part is produced and low lower limit comparison reference voltage Vlow and high upper limit comparison reference voltage Vhigh with control apparatus equipment.
2. input voltage protection circuit as claimed in claim 1; it is characterized in that: described sampling part includes rectifier diode D1, four divider resistance R4, R5, R6, R7; and two filter capacitor C4, C5; wherein; the first filter capacitor C4 is connected between the negative pole and ground of rectifier diode, and the second filter capacitor C5 and resistance R 7 back in parallel ground connection.
3. input voltage protection as claimed in claim 2; it is characterized in that: described relatively output includes dual operational amplifier IC2; described dual operational amplifier IC2 inside comprises two independently operational amplifiers; be respectively first, second operational amplifier IC2A, IC2B; wherein; the output of first, second operational amplifier IC2A, IC2B is connected to current-limiting resistance R8 by first, second diode D2, D3 respectively; through the coupling metering function of resistance R 8, produce the direct-current control voltage signal.
4. input voltage protection circuit as claimed in claim 3; it is characterized in that: described power supply circuits partly include resistance R 1, first, second filter capacitor C1, the C2 of direct connection direct current supply voltage vcc, two divider resistance R1, R9 and voltage stabilizing didoe IC1; wherein; the direct current supply voltage vcc is through the dividing potential drop effect of resistance R 1, R2, R9; and the filtering of first, second filter capacitor C1, C2; by voltage stabilizing didoe IC1 silicon controlled pressure stabilization function, produce stable supply power voltage V1.
5. input voltage protection circuit as claimed in claim 4; it is characterized in that: the pin that a branch road is connected to voltage stabilizing didoe IC1 is drawn in two divider resistance R1, R9 series connection of described power supply circuits part and its centre, can change the height of V1 voltage by the resistance parameter of adjusting resistance R 1 and R9.
6. input voltage protection circuit as claimed in claim 5; it is characterized in that: the supply power voltage V1 that described power supply circuits partly produce is divided into three branch roads; the one branch road is connected to the inverting input of the second operational amplifier IC2B of comparison output; with as high upper limit comparison reference voltage Vhigh, and other two branch roads are connected to reference part and first operational amplifier of output relatively respectively.
7. input voltage protection circuit as claimed in claim 6; it is characterized in that: described reference part includes two divider resistance R3, R10 and the filter capacitor C3 in parallel with R10; supply power voltage V1 is through the dividing potential drop of resistance R 3 and R10; and the filtering of capacitor C 3, produce the first operational amplifier in-phase input end that low lower limit comparison reference voltage Vlow is connected to the comparison output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100675957A CN101364730B (en) | 2008-06-06 | 2008-06-06 | Input voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100675957A CN101364730B (en) | 2008-06-06 | 2008-06-06 | Input voltage protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101364730A true CN101364730A (en) | 2009-02-11 |
| CN101364730B CN101364730B (en) | 2011-07-20 |
Family
ID=40390948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100675957A Expired - Fee Related CN101364730B (en) | 2008-06-06 | 2008-06-06 | Input voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101364730B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865947A (en) * | 2010-06-24 | 2010-10-20 | 四川长虹电器股份有限公司 | AC input detection circuit and detection method of power supply of flat television |
| CN101707829B (en) * | 2009-05-21 | 2013-03-13 | 海洋王照明科技股份有限公司 | Lamp control circuit |
| CN103683206A (en) * | 2013-12-18 | 2014-03-26 | 深圳市共进电子股份有限公司 | Input overvoltage and undervoltage protection circuit with high-voltage startup function and input overvoltage and undervoltage protection method |
| CN103722276A (en) * | 2013-12-27 | 2014-04-16 | 上海沪工焊接集团股份有限公司 | Peak current feedback circuit used for inverter welding machine |
| CN105633905A (en) * | 2014-10-27 | 2016-06-01 | 深圳市兰丁科技有限公司 | Overvoltage and under-voltage protection circuit |
| CN106410747A (en) * | 2015-07-28 | 2017-02-15 | 广东爱迪贝克软件科技有限公司 | Uninterrupted power supply (UPS) input protection circuit and UPS |
| CN106549641A (en) * | 2015-09-16 | 2017-03-29 | 中兴通讯股份有限公司 | A kind of protection circuit |
-
2008
- 2008-06-06 CN CN2008100675957A patent/CN101364730B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707829B (en) * | 2009-05-21 | 2013-03-13 | 海洋王照明科技股份有限公司 | Lamp control circuit |
| CN101865947A (en) * | 2010-06-24 | 2010-10-20 | 四川长虹电器股份有限公司 | AC input detection circuit and detection method of power supply of flat television |
| CN101865947B (en) * | 2010-06-24 | 2012-11-21 | 四川长虹电器股份有限公司 | AC input detection circuit and detection method of power supply of flat television |
| CN103683206A (en) * | 2013-12-18 | 2014-03-26 | 深圳市共进电子股份有限公司 | Input overvoltage and undervoltage protection circuit with high-voltage startup function and input overvoltage and undervoltage protection method |
| CN103683206B (en) * | 2013-12-18 | 2017-08-22 | 深圳市共进电子股份有限公司 | Input over-and under-voltage protection circuit and method with high voltage startup |
| CN103722276A (en) * | 2013-12-27 | 2014-04-16 | 上海沪工焊接集团股份有限公司 | Peak current feedback circuit used for inverter welding machine |
| CN103722276B (en) * | 2013-12-27 | 2016-08-17 | 上海沪工焊接集团股份有限公司 | A kind of inverter type welder peak point current feedback circuit |
| CN105633905A (en) * | 2014-10-27 | 2016-06-01 | 深圳市兰丁科技有限公司 | Overvoltage and under-voltage protection circuit |
| CN106410747A (en) * | 2015-07-28 | 2017-02-15 | 广东爱迪贝克软件科技有限公司 | Uninterrupted power supply (UPS) input protection circuit and UPS |
| CN106549641A (en) * | 2015-09-16 | 2017-03-29 | 中兴通讯股份有限公司 | A kind of protection circuit |
| CN106549641B (en) * | 2015-09-16 | 2021-07-06 | 中兴通讯股份有限公司 | Protective circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101364730B (en) | 2011-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101364730B (en) | Input voltage protection circuit | |
| CN101867168B (en) | Power protecting circuit and LED lamp | |
| CN105471049B (en) | A kind of charging circuit | |
| CN105186444A (en) | Power supply protection circuit | |
| CN103219893A (en) | Switch power supply controller and switch power supply circuit | |
| CN105242426B (en) | The power-up time delay circuit and liquid crystal display of a kind of liquid crystal display | |
| CN207150798U (en) | Stereo set | |
| CN206332432U (en) | Dc bus under-voltage protecting circuit of the low cost with isolation self-locking | |
| CN201388072Y (en) | Television with universal charging function | |
| CN106505856B (en) | Input voltage auto-adjusting circuit and electronic equipment | |
| CN201294489Y (en) | Load circuit, power supply circuit and electronic equipment | |
| CN103269154B (en) | A kind of power electronic equipment dc-link capacitance automatic discharge circuit | |
| CN203027014U (en) | Dual-power supply circuit and audio-visual player | |
| CN104362468A (en) | Power socket and monitoring device for same | |
| CN101630898B (en) | Circuit for regulating and controlling output power of power supply | |
| CN208656446U (en) | A kind of anti-impacting with high pressure input circuit of mobile power source | |
| CN207542998U (en) | A kind of regulator circuit with input undervoltage, overvoltage protection | |
| CN207625292U (en) | Power supply switching circuit and television power supply system | |
| CN207184070U (en) | A kind of low starting current power-supply circuit for cable monitoring | |
| CN206807290U (en) | A kind of smart electronicses pressure regulator | |
| CN205610482U (en) | Direct current steady voltage protective power supply | |
| CN104167911B (en) | Voltage boost protection circuit | |
| CN203617680U (en) | Driving circuit and protection circuit thereof | |
| CN204289267U (en) | Relay low voltage start circuit and electronic equipment | |
| CN102856937B (en) | Emergency power supply with charging function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: RUGAO YINGRUI HIGH VOLTAGE ELECTRICA EQUIPMENT CO. Free format text: FORMER OWNER: CHUANGWEI-RGB ELECTRONIC CO., LTD., SHENZHEN Effective date: 20141224 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518000 SHENZHEN, GUANGDONG PROVINCE TO: 226502 NANTONG, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20141224 Address after: Jiangsu Nantong City, Rugao City, 226502 towns such as Fushou Road No. 289 Patentee after: Rugao Yinrun High Voltage Electrica Equipment Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A13-16 Patentee before: Shenzhen Skyworth-RGB Electronics Co., Ltd. |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Input voltage protection circuit Effective date of registration: 20151217 Granted publication date: 20110720 Pledgee: Rugao science and Technology Park Pledgor: Rugao Yinrun High Voltage Electrica Equipment Co.,Ltd. Registration number: 2015320000019 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20180503 Granted publication date: 20110720 Pledgee: Rugao science and Technology Park Pledgor: Rugao Yinrun High Voltage Electrica Equipment Co.,Ltd. Registration number: 2015320000019 |
|
| 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: 20110720 Termination date: 20170606 |