CN202351310U - Circuit device for detecting alternating current (AC) power failure of liquid crystal display television (LCD TV) - Google Patents
Circuit device for detecting alternating current (AC) power failure of liquid crystal display television (LCD TV) Download PDFInfo
- Publication number
- CN202351310U CN202351310U CN2011204767279U CN201120476727U CN202351310U CN 202351310 U CN202351310 U CN 202351310U CN 2011204767279 U CN2011204767279 U CN 2011204767279U CN 201120476727 U CN201120476727 U CN 201120476727U CN 202351310 U CN202351310 U CN 202351310U
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- alternating current
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Abstract
The utility model relates to the field of signal detection of a liquid crystal display television (LCD TV), in particular to a circuit device for detecting alternating current (AC) power failure of the LCD TV. Aiming at the problems in the prior art, the utility model provides the circuit device for detecting the alternating current (AC) power failure of the LCD TV. + 5 v DC voltage supplies power by inputting AC input signals through an AC/DC conversion circuit, so that when the + 5 v DC voltage is reduced and reset signals are supplied to a processer to make the AC input signals input again, the processor can normally work by detecting the reduction of the voltage value of the power supply end of the + 5 v DC voltage of the processer and comparing the voltage value with threshold values set by a power failure detecting circuit. According to the circuit device, all the circuits are operated in a matching manner to complete the design. The circuit device is mainly applied to the field of signal detection of the LCD TV.
Description
Technical field
The utility model relates to LCD TV input field, especially a kind of circuit arrangement that detects LCD TV interchange power down.
Background technology
At present LCD TV has become the main product in TV market, but in the process that plant produced debugging and user use, because the unstable or power-line plug of electrical network such as becomes flexible at factor, can cause LCD TV alternating current instant power-down.Owing to be instant power-down, cause the LCD TV master chip not to be reset, thus the problem that can not start shooting, can only plug power-line plug again could start shooting, and makes troubles to plant produced debugging and user's use.
The utility model content
The utility model technical matters to be solved is: to the problem of above-mentioned existence; A kind of circuit arrangement that LCD TV exchanges power down that detects is provided; Because+the 5V DC-voltage supply is that ac input signal comes through ac-dc converter circuit; The threshold value of setting through the reduction and the power-fail detection circuit of measurement processor+5V DC-voltage supply terminal voltage value compares; + when the 5V DC voltage reduced, when making that to processor reset signals ac input signal is imported once more, processor just can operate as normal.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of circuit arrangement that detects LCD TV interchange power down; Comprise ac-dc converter circuit, processor, low pressure difference linear voltage regulator, power end, power-fail detection circuit; Said alternating current input signal converts DC voltage into through ac-dc converter circuit; Said ac-dc converter circuit is connected with power-fail detection circuit one port, low pressure difference linear voltage regulator one port respectively, and said power-fail detection circuit another port is connected with the processor another port.
A kind of circuit arrangement that detects LCD TV interchange power down; Also comprise first resistance R 1, second resistance R 2; Said first resistance R 1 two ends ac-dc converter circuit, power-fail detection circuit one port respectively connect, and said second resistance R 2 two ends are connected with power-fail detection circuit another port, processor another port respectively.
It is the 5V d. c. voltage signal that said ac input signal changes circuit conversion through the alternating current-direct current dress, and power-fail detection circuit is AME8500.
Can find out that from the architectural feature of above-mentioned the utility model its advantage is
In sum, the utility model is through increasing a simple power-fail detection circuit that exchanges, and can avoid LCD TV because the unstable phenomenon of not starting shooting that causes with situation such as plug are loosening of electrical network, debugs to plant produced to offer convenience.
Description of drawings
The utility model will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the utility model schematic diagram.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model is meant when the ac voltage signal power down appears in LCD TV; And through ac-dc converter circuit with ac voltage signal conversion+the 5V DC voltage can be lower than the threshold voltage that power-fail detection circuit is set; Power-fail detection circuit will be given the reset pulse of a high level of master chip; Make system reset, avoid exchanging the problem that the instant power-down LCD TV can not normal boot-strap.
As shown in Figure 1; A kind of circuit arrangement that detects LCD TV interchange power down; Comprise ac-dc converter circuit, processor, low pressure difference linear voltage regulator, power end, power-fail detection circuit; Said alternating current input signal converts DC voltage into through ac-dc converter circuit, and said ac-dc converter circuit is connected with power-fail detection circuit one port, low pressure difference linear voltage regulator one port respectively, and said power-fail detection circuit another port is connected with the processor another port.Also comprise first resistance R 1, second resistance R 2, said first resistance R 1 two ends ac-dc converter circuit, power-fail detection circuit one port respectively connect, and said second resistance R 2 two ends are connected with power-fail detection circuit another port, processor another port respectively.It is the 5V d. c. voltage signal that said ac input signal changes circuit conversion through the alternating current-direct current dress, and power-fail detection circuit is AME8500.Wherein first resistance R 1 and second resistance R 2 are current-limiting resistances.
The alternating voltage input signal converts into+the 5V DC voltage through ac-dc converter circuit (function is: convert ac voltage signal into d. c. voltage signal); Give the power supply of processor (LCD TV mainboard processor), when exchanging the power down generation, along with the 220V alternating voltage reduces; Must cause to the processor dc power supply terminal+the 5V DC voltage reduces; Detect this variation through power-fail detection circuit, when+when 5V voltage was lower than the threshold voltage of power-fail detection circuit setting, the RESET pin of power-fail detection circuit AME8500A will be given high level pulse of processor; Make processor reset; When interchange powered on once more like this, processor just can operate as normal, and LCD TV just can normal boot-strap.Thereby when having avoided the alternating current instant power-down, because the electric capacity of reset circuit has little time discharge, system can't reset, the problem that LCD TV can't be started shooting.
Disclosed all characteristics in this instructions except mutually exclusive characteristic, all can make up by any way.
Disclosed arbitrary characteristic in this instructions (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
Claims (3)
1. one kind is detected the circuit arrangement that LCD TV exchanges power down; Comprise ac-dc converter circuit, processor, low pressure difference linear voltage regulator, power end; It is characterized in that also comprising power-fail detection circuit; Said alternating current input signal converts DC voltage into through ac-dc converter circuit, and said ac-dc converter circuit is connected with power-fail detection circuit one port, low pressure difference linear voltage regulator one port respectively, and said power-fail detection circuit another port is connected with the processor another port.
2. a kind of circuit arrangement that LCD TV exchanges power down that detects according to claim 1; It is characterized in that also comprising first resistance R 1, second resistance R 2; Said first resistance R 1 two ends ac-dc converter circuit, power-fail detection circuit one port respectively connect, and said second resistance R 2 two ends are connected with power-fail detection circuit another port, processor another port respectively.
3. a kind of circuit arrangement that LCD TV exchanges power down that detects according to claim 2 is characterized in that it is the 5V d. c. voltage signal that said ac input signal changes circuit conversion through the alternating current-direct current dress, and power-fail detection circuit is AME8500.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204767279U CN202351310U (en) | 2011-11-25 | 2011-11-25 | Circuit device for detecting alternating current (AC) power failure of liquid crystal display television (LCD TV) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204767279U CN202351310U (en) | 2011-11-25 | 2011-11-25 | Circuit device for detecting alternating current (AC) power failure of liquid crystal display television (LCD TV) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202351310U true CN202351310U (en) | 2012-07-25 |
Family
ID=46540306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204767279U Expired - Fee Related CN202351310U (en) | 2011-11-25 | 2011-11-25 | Circuit device for detecting alternating current (AC) power failure of liquid crystal display television (LCD TV) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202351310U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120652A (en) * | 2019-05-30 | 2019-08-13 | 宁波奥克斯电气股份有限公司 | A kind of method, system and air conditioner for preventing power down from accidentally protecting |
-
2011
- 2011-11-25 CN CN2011204767279U patent/CN202351310U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120652A (en) * | 2019-05-30 | 2019-08-13 | 宁波奥克斯电气股份有限公司 | A kind of method, system and air conditioner for preventing power down from accidentally protecting |
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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: 20120725 Termination date: 20171125 |