CN103108427B - Light emitting diode (LED) drive chip, LED lamp and high voltage monitoring protection circuit - Google Patents
Light emitting diode (LED) drive chip, LED lamp and high voltage monitoring protection circuit Download PDFInfo
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- CN103108427B CN103108427B CN201110358965.4A CN201110358965A CN103108427B CN 103108427 B CN103108427 B CN 103108427B CN 201110358965 A CN201110358965 A CN 201110358965A CN 103108427 B CN103108427 B CN 103108427B
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- divider resistance
- hysteresis comparator
- high pressure
- pressure monitoring
- protecting circuit
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Abstract
The invention relates to a protection circuit, in particular to a high voltage detection protection circuit and application of the high voltage detection protection circuit in a chip. The high voltage detection protection circuit is connected with power source collector voltage (VCC) and a novel pre-overvoltage mode is adopted so that high voltage monitoring and protection can be achieved. The circuit is capable of being used in inner design of various chips. Taking a light emitting diode (LED) drive chip as an example, two output ends of a high voltage monitoring module are connected with a constant current module of the LED drive chip. An ultra-high voltage (UHV) 1dnmos is arranged inside the circuit so that under the condition of overshoot at the power source voltage of up to 700V, the chip can be prevented from being damaged or burnt and can work normally. A voltage protection value of the circuit can be set according to different operational requirements so that degree of the chip influenced by environment is reduced to the lowest point, stability and reliability of operation of an integrated circuit is improved and an application modes and range of the chip are wide.
Description
Technical field
The present invention relates to a kind of protective circuit, particularly relate to a kind of high pressure monitoring and protecting circuit and the application in LED lamp inside thereof.
Background technology
In each adhesive integrated circuit, all there is a tolerance value scope in the normal working voltage of chip, is mostly in this interval of 5V ~ 24V.When supply power voltage increasing degree is excessive or abnormal sudden sharp increase appears in power supply, when exceeding the tolerance value of chip operating voltage, chip just there will be that damage is in various degree even not recoverable burns.Existing high pressure monitoring and protecting circuit, majority utilizes electric pressure converter or high-tension transformer, converts the operating voltage exceeding tolerance value scope of input to normal working voltage, and components and parts are many, and circuit structure is complicated.
Summary of the invention
The object of the present invention is to provide a kind of high pressure monitoring and protecting circuit.This high pressure monitoring and protecting circuit can expand the range of application of integrated circuit, and degree affected by environment for integrated circuit is down to low spot, improves integrated circuit stability operationally and reliability.By this circuit application in all kinds of chip design, the utilization of chip will be more flexible, and scope is more extensive.
The present invention is achieved in that
A kind of high pressure monitoring and protecting circuit 100, is connected with power supply VCC, comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, voltage stabilizing didoe D1, the first hysteresis comparator CMP1 and the second hysteresis comparator CMP2;
Described divider resistance R1, divider resistance R2, divider resistance R3 and divider resistance R4 is serially connected between power supply and ground successively, the negative electrode of described voltage stabilizing didoe D1 is connected to the public connecting end of described divider resistance R1 and described divider resistance R2, the plus earth of described voltage stabilizing didoe D1, the voltage signal inputs of described first hysteresis comparator CMP1 is connected on the public connecting end of described divider resistance R1 and described divider resistance R2, the reference voltage input terminal of described first hysteresis comparator CMP1 and bias voltage input external input signal respectively, the signal output part of described first hysteresis comparator CMP1 is the first output OVP1 of described high pressure monitoring and protecting circuit, the voltage signal inputs of described second hysteresis comparator CMP2 is connected on the public connecting end of described divider resistance R2 and described divider resistance R3, the reference voltage input terminal of described second hysteresis comparator CMP2 and bias voltage input external input signal respectively, the signal output part of described second hysteresis comparator CMP2 is the second output OVP2 of described high pressure monitoring and protecting circuit.
Described high pressure monitoring and protecting circuit 100 utilizes the operating characteristic of hysteresis comparator, adopts the pre-overpressure mode of innovation, carries out high pressure monitoring and protection.
This high pressure monitoring and protecting circuit 100 can be applied to the indoor design of all kinds of chip; for its utilization in the middle of LED drive chip, this high pressure monitoring and protecting circuit 100 is connected with the constant flow module 200 in LED drive chip by two outputs OVP1, OVP2.The built-in UHV ldnmos of drive circuit, makes to cross at the supply voltage up to 700V to sweep away, and driving chip still can be avoided damage or burn, and realizes normally working.
The voltage protection value of high pressure monitoring and protecting circuit 100 can set according to different needs of work; like this; the degree making chip affected by environment is down to comparatively low spot, improves stability and the reliability of integrated circuit operation, and application mode and the scope of chip will be extensive all the more.
Another object of the present invention is to provide a kind of LED lamp, the driving chip of this light fixture comprises a high pressure monitoring and protecting circuit be connected with constant flow module, and described high pressure monitoring and protecting circuit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, voltage stabilizing didoe D1, the first hysteresis comparator CMP1 and the second hysteresis comparator CMP2;
Described divider resistance R1, divider resistance R2, divider resistance R3 and divider resistance R4 is serially connected between power supply and ground successively, the negative electrode of described voltage stabilizing didoe D1 is connected to the public connecting end of described divider resistance R1 and described divider resistance R2, the plus earth of described voltage stabilizing didoe D1, the voltage signal inputs of described first hysteresis comparator CMP1 is connected on the public connecting end of described divider resistance R1 and described divider resistance R2, the reference voltage input terminal of described first hysteresis comparator CMP1 and bias voltage input external input signal respectively, the signal output part of described first hysteresis comparator CMP1 is the first output OVP1 of described high pressure monitoring and protecting circuit, the voltage signal inputs of described second hysteresis comparator CMP2 is connected on the public connecting end of described divider resistance R2 and described divider resistance R3, the reference voltage input terminal of described second hysteresis comparator CMP2 and bias voltage input external input signal respectively, the signal output part of described second hysteresis comparator CMP2 is the second output OVP2 of described high pressure monitoring and protecting circuit, described high pressure monitoring and protecting circuit is by two described output OVP1, OVP2 is connected with described constant flow module.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of high pressure monitoring and protecting circuit provided by the present invention;
Fig. 2 is that the high pressure monitoring and protecting circuit application that provides of the embodiment of the present invention is in the system block diagram of LED drive chip.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows the circuit structure diagram of high pressure monitoring and protecting circuit provided by the present invention.As shown in the figure, VCC is external power supply, and high pressure monitoring and protecting circuit 100 comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, voltage stabilizing didoe D1, the first hysteresis comparator CMP1 and the second hysteresis comparator CMP2;
Divider resistance R1, divider resistance R2, divider resistance R3 and divider resistance R4 are serially connected between power supply VCC and ground successively; The negative electrode of voltage stabilizing didoe D1 is connected to the public connecting end of divider resistance R1 and divider resistance R2, the plus earth of voltage stabilizing didoe D1; The voltage signal inputs INP of the first hysteresis comparator CMP1 is connected on the public connecting end of divider resistance R1 and divider resistance R2, the reference voltage input terminal INN of the first hysteresis comparator CMP1 and bias voltage input IBios1 be external input signal respectively, and the output of the first hysteresis comparator CMP1 is as the first output OVP1 of high pressure monitoring and protecting circuit 100; The voltage signal inputs INP of the second hysteresis comparator CMP2 is connected on the public connecting end of divider resistance R2 and divider resistance R3; the reference voltage input terminal INN of the second hysteresis comparator CMP2 and bias voltage input Ibios2 be external input signal respectively, and the output OVP2 of the second hysteresis comparator CMP2 is as the second output OVP2 of high pressure monitoring and protecting circuit 100.
Fig. 2 shows high pressure monitoring and protecting circuit application provided by the invention in the system block diagram of LED drive chip.Wherein, high pressure monitoring and protecting circuit 100 has two outputs, is respectively OVP1 and OVP2, and high pressure monitoring and protecting circuit 100 is connected with constant flow module 200 by these two outputs.
Below in conjunction with accompanying drawing 2, be specifically described by the operation principle of this high pressure monitoring and protecting circuit application to LED drive chip:
According to concrete utilization situation chosen in advance four divider resistances of LED drive circuit, the threshold values of setting hysteresis comparator;
Switch on power; when VCC voltage is elevated to the pre-overvoltage protection threshold V1 preset; the output OVP1 of the first hysteresis comparator CMP1 becomes level"1" from the level "0" given tacit consent to, and the output current of constant flow module is reduced by normal value, such as, be reduced to original 5%.When current value is reduced to 5% of normal value, LED is dimmed, and reminding user supply voltage is too high, and circuit enters pre-overvoltage protection mode;
When VCC voltage continues to raise; when arriving the second overvoltage protection threshold V2 preset, the output OVP2 of the second hysteresis comparator CMP2 becomes level"1" from the level "0" given tacit consent to, and the output current of constant flow module is thoroughly closed; LED is extinguished, and carries out abnormity prompt to user.
In order to ensure the hysteresis effect of pressure point, when VCC voltage is reduced by the second overvoltage protection threshold V2, when being just reduced to below V2, the output OVP2 of the second hysteresis comparator CMP2 keeps level"1", only have when VCC voltage drop is to V3 (V3 certain value lower than V2), the output OVP2 of the second hysteresis comparator CMP2 just becomes level "0" from level"1", and constant flow module enters pre-overvoltage mode of operation again;
When VCC voltage continues to reduce, when dropping to V4 (V4 certain value lower than V1), the output OVP1 of the first hysteresis comparator CMP1 just becomes level "0" from level"1", and constant flow module recovers normal mode of operation, and circuit exports the running current value preset.
The voltage relationship of hysteresis comparator threshold values V1, V2, V3 and V4 is confirmed as V4 < V1 < V3 < V2, and these four magnitudes of voltage can set according to embody rule.
Described high pressure monitoring and protecting circuit utilizes the operating characteristic of hysteresis comparator, adopts the pre-overpressure mode of innovation, carries out high pressure monitoring and protection.Driving chip circuit can built-in UHV ldnmos, makes to cross at the supply voltage up to 700V to sweep away, and chip still can be avoided damage or burn, and realizes normally working.
This circuit can be applied to the indoor design of all kinds of chip, like this, significantly can promote the ability to bear of chip to voltage, improve chip to the adaptive capacity of environment, the degree making chip affected by environment is down to comparatively low spot, improve stability and the reliability of integrated circuit operation, application mode and the scope of chip will be extensive all the more.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a high pressure monitoring and protecting circuit, is connected with power supply, it is characterized in that, described high pressure monitoring and protecting circuit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, voltage stabilizing didoe D1, the first hysteresis comparator CMP1 and the second hysteresis comparator CMP2;
Described divider resistance R1, divider resistance R2, divider resistance R3 and divider resistance R4 is serially connected between power supply and ground successively, the negative electrode of described voltage stabilizing didoe D1 is connected to the public connecting end of described divider resistance R1 and described divider resistance R2, the plus earth of described voltage stabilizing didoe D1, the voltage signal inputs of described first hysteresis comparator CMP1 is connected on the public connecting end of described divider resistance R1 and described divider resistance R2, the reference voltage input terminal of described first hysteresis comparator CMP1 and bias voltage input external input signal respectively, the signal output part of described first hysteresis comparator CMP1 is the first output OVP1 of described high pressure monitoring and protecting circuit, the voltage signal inputs of described second hysteresis comparator CMP2 is connected on the public connecting end of described divider resistance R2 and described divider resistance R3, the reference voltage input terminal of described second hysteresis comparator CMP2 and bias voltage input external input signal respectively, the signal output part of described second hysteresis comparator CMP2 is the second output OVP2 of described high pressure monitoring and protecting circuit.
2. a LED drive chip, comprises constant flow module, it is characterized in that: described LED drive chip also comprises a high pressure monitoring and protecting circuit be connected with described constant flow module, and described high pressure monitoring and protecting circuit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, voltage stabilizing didoe D1, the first hysteresis comparator CMP1 and the second hysteresis comparator CMP2;
Described divider resistance R1, divider resistance R2, divider resistance R3 and divider resistance R4 is serially connected between power supply and ground successively, the negative electrode of described voltage stabilizing didoe D1 is connected to the public connecting end of described divider resistance R1 and described divider resistance R2, the plus earth of described voltage stabilizing didoe D1, the voltage signal inputs of described first hysteresis comparator CMP1 is connected on the public connecting end of described divider resistance R1 and described divider resistance R2, the reference voltage input terminal of described first hysteresis comparator CMP1 and bias voltage input external input signal respectively, the signal output part of described first hysteresis comparator CMP1 is the first output OVP1 of described high pressure monitoring and protecting circuit, the voltage signal inputs of described second hysteresis comparator CMP2 is connected on the public connecting end of described divider resistance R2 and described divider resistance R3, the reference voltage input terminal of described second hysteresis comparator CMP2 and bias voltage input external input signal respectively, the signal output part of described second hysteresis comparator CMP2 is the second output OVP2 of described high pressure monitoring and protecting circuit, described high pressure monitoring and protecting circuit is by the first described output OVP1, second output OVP2 is connected with described constant flow module.
3. a LED lamp, is characterized in that: described LED lamp comprises a kind of driving chip, and described driving chip comprises high pressure monitoring and protecting circuit and constant flow module, and described high pressure monitoring and protecting circuit comprises:
Divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, voltage stabilizing didoe D1, the first hysteresis comparator CMP1 and the second hysteresis comparator CMP2;
Described divider resistance R1, divider resistance R2, divider resistance R3 and divider resistance R4 is serially connected between power supply and ground successively, the negative electrode of described voltage stabilizing didoe D1 is connected to the public connecting end of described divider resistance R1 and described divider resistance R2, the plus earth of described voltage stabilizing didoe D1, the voltage signal inputs of described first hysteresis comparator CMP1 is connected on the public connecting end of described divider resistance R1 and described divider resistance R2, the reference voltage input terminal of described first hysteresis comparator CMP1 and bias voltage input external input signal respectively, the signal output part of described first hysteresis comparator CMP1 is the first output OVP1 of described high pressure monitoring and protecting circuit, the voltage signal inputs of described second hysteresis comparator CMP2 is connected on the public connecting end of described divider resistance R2 and described divider resistance R3, the reference voltage input terminal of described second hysteresis comparator CMP2 and bias voltage input external input signal respectively, the signal output part of described second hysteresis comparator CMP2 is the second output OVP2 of described high pressure monitoring and protecting circuit, described high pressure monitoring and protecting circuit is by the first described output OVP1, second output OVP2 is connected with described constant flow module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110358965.4A CN103108427B (en) | 2011-11-14 | 2011-11-14 | Light emitting diode (LED) drive chip, LED lamp and high voltage monitoring protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110358965.4A CN103108427B (en) | 2011-11-14 | 2011-11-14 | Light emitting diode (LED) drive chip, LED lamp and high voltage monitoring protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103108427A CN103108427A (en) | 2013-05-15 |
| CN103108427B true CN103108427B (en) | 2015-05-13 |
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| CN201110358965.4A Active CN103108427B (en) | 2011-11-14 | 2011-11-14 | Light emitting diode (LED) drive chip, LED lamp and high voltage monitoring protection circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549641B (en) * | 2015-09-16 | 2021-07-06 | 中兴通讯股份有限公司 | Protective circuit |
| CN115296259B (en) * | 2022-09-27 | 2022-12-20 | 深圳利普芯微电子有限公司 | Overvoltage protection circuit and LED drive power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1663091A (en) * | 2002-06-14 | 2005-08-31 | 汤姆森许可贸易公司 | Protected dual-voltage microcircuit power arrangement |
| CN101916985A (en) * | 2010-07-20 | 2010-12-15 | 美的集团有限公司 | Monitoring method for IGBT collector overvoltage double protection |
| CN201708784U (en) * | 2010-06-29 | 2011-01-12 | 日银Imp微电子有限公司 | Electric level transfer circuit with function of anti-jamming protection |
| CN102022805A (en) * | 2009-09-22 | 2011-04-20 | 乐金电子(天津)电器有限公司 | Overvoltage protection circuit of air conditioning refrigerant pipe |
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2011
- 2011-11-14 CN CN201110358965.4A patent/CN103108427B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1663091A (en) * | 2002-06-14 | 2005-08-31 | 汤姆森许可贸易公司 | Protected dual-voltage microcircuit power arrangement |
| CN102022805A (en) * | 2009-09-22 | 2011-04-20 | 乐金电子(天津)电器有限公司 | Overvoltage protection circuit of air conditioning refrigerant pipe |
| CN201708784U (en) * | 2010-06-29 | 2011-01-12 | 日银Imp微电子有限公司 | Electric level transfer circuit with function of anti-jamming protection |
| CN101916985A (en) * | 2010-07-20 | 2010-12-15 | 美的集团有限公司 | Monitoring method for IGBT collector overvoltage double protection |
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| CN103108427A (en) | 2013-05-15 |
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Address after: 518000 Guangdong City, Nanshan District province high tech in the middle of the two road, No. 2 Shenzhen International Software Park, room 201-205, room, 4 (only office) (222-226) Patentee after: Shenzhen mayor express Semiconductor Technology Co., Ltd. Address before: 518000, No. 2, building 4, two software park, central science and technology zone, Nanshan District hi tech Zone, Guangdong, Shenzhen Patentee before: Shenzhen CYT Optoelectronic Technology Co.,Ltd. |
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