CN203672956U - Power down insulation detection circuit - Google Patents
Power down insulation detection circuit Download PDFInfo
- Publication number
- CN203672956U CN203672956U CN201320778961.6U CN201320778961U CN203672956U CN 203672956 U CN203672956 U CN 203672956U CN 201320778961 U CN201320778961 U CN 201320778961U CN 203672956 U CN203672956 U CN 203672956U
- Authority
- CN
- China
- Prior art keywords
- voltage stabilizing
- power
- stabilizing diode
- detection circuit
- diode
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000009413 insulation Methods 0.000 title abstract 4
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 abstract description 4
- 239000006173 Good's buffer Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000008054 signal transmission Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Abstract
The utility model discloses a power down insulation detection circuit, relating to the field of circuit test and solving the problem of low sensitivity in the current technology and high cost. The power down insulation detection circuit includes an optical coupled isolator and a voltage stabilizing diode, the positive electrode of a luminous diode inside of the optical coupled isolator is connected with a power output end via a resistor, and the negative electrode of the luminous diode is connected with the negative electrode of the voltage stabilizing diode, and the positive of the voltage stabilizing diode is grounded a collector and an emitter of the phototriode inside of the optical coupled isolator are connected with an input pin of an output display terminal to feed back the detection result through outputting the electric signal to the terminal display. The circuit realizes the insulation detection for the power failure, and the input and output electric signals of the optical coupled isolator are with good buffer function, moreover, the electric signal transmission with unidirectionality has good electrical insulating ability, anti-jamming performance and high sensitivity, in addition, the need of measuring the power failure for various voltages can be met via adjusting the specifications of some components, meanwhile, the lowest cost is possessed.
Description
Technical field
The utility model relates to electric circuit inspection field, is specifically related to a kind of cost low, highly sensitive, the power supply power-fail isolation detection circuit that antijamming capability is strong.
Background technology
In electric circuit inspection field, often need to carry out detection of power loss to power circuit, traditional power-fail detection circuit, great majority are on the L line and N line being directly connected in circuit, then by current-limiting resistance R, diode, and optocoupler comes in detection of grid, whether there is electricity, or realize detection of power loss function by integrated chip etc.Although the testing circuit of this kind of structure can detect the power-down conditions of circuit,, exist circuit structure complexity, circuit cost is high, and power consumption is large, and sensitivity is low, the problem such as is easily disturbed.
Utility model content
The defect existing in order to solve above-mentioned technology, the utility model provides a kind of cost low, highly sensitive, the power supply power-fail isolation detection circuit that antijamming capability is strong.
The utility model is realized the technical scheme that above-mentioned technique effect adopts:
A kind of power supply power-fail isolation detection circuit, comprise optical coupling isolator and voltage stabilizing diode, described optical coupling isolator comprises light emitting diode and phototriode, the positive pole of described light emitting diode is connected to power output end by a resistance R 1, the negative pole of described light emitting diode is connected with the negative pole of described voltage stabilizing diode, the plus earth of described voltage stabilizing diode.
Above-mentioned a kind of power supply power-fail isolation detection circuit, the collector and emitter of described phototriode connects the input pin of output display terminal.
The beneficial effects of the utility model are: this power supply power-fail isolation detection circuit has been realized the isolation detection to power supply power-fail situation, the input of optical coupling isolator, output electrical signals have good buffer action, electric signal transmission has one-way, possess good electrical isolation capabilities and antijamming capability, highly sensitive, in addition, by the specification of adjustment member element, the power supply power-fail that can also adapt to various voltages detects demand, has extremely low cost simultaneously.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
Embodiment
For making that the utility model is done further to understand, below with reference to Figure of description and specific embodiment, the utility model is described in further detail:
As shown in Figure 1, a kind of power supply power-fail isolation detection circuit, comprise optical coupling isolator U1 and voltage stabilizing diode Z1, described optical coupling isolator U1 comprises light emitting diode and phototriode, the positive pole 1 of described light emitting diode is connected to power output end by a resistance R 1, this power output end offers the operating voltage VCC of testing circuit described in the utility model, and the negative pole 2 of described light emitting diode is connected with the negative pole of described voltage stabilizing diode, the plus earth of described voltage stabilizing diode.The collector 4 of described phototriode and emitter 3 connect the input pin of output display terminal.
In the time of specific works, described voltage stabilizing diode Z1 is for determining the threshold value of power supply power-fail, this threshold value is the breakdown reverse voltage of voltage stabilizing diode Z1, when supply voltage VCC is during higher than the threshold value of voltage stabilizing diode Z1, the operating voltage of optical coupling isolator U1 is that supply voltage VCC deducts the value after the forward voltage drop of this threshold voltage and optical coupling isolator U1, and resistance R 1 is for determining the working current of optical coupling isolator U1.When supply voltage VCC is during lower than the threshold value of voltage stabilizing diode Z1, voltage stabilizing diode Z1 is in reverse blocking state, show high resistance, optical coupling isolator U1 is in off state, corresponding, the light emitting diode of optical coupling isolator U1 inside is not lighted, the emitter no-output electric signal of phototriode, and output display terminal is without corresponding feedback.When supply voltage VCC is during higher than the threshold value of voltage stabilizing diode Z1, voltage stabilizing diode Z1 is reversed and punctures, optical coupling isolator U1 conducting, corresponding, the light emitting diode of optical coupling isolator U1 inside is lighted, the base stage of phototriode receives light signal and converts light signal to electric signal and exported by emitter 3, and output display terminal receives electric signal and makes corresponding feedback.Thus, can judge easily the power-down conditions of circuit-under-test.
This circuit has been realized the isolation detection to power supply power-fail situation, the electricity isolation completely of the input end of optical coupling isolator and output terminal, and its input, output electrical signals have good buffer action, electric signal transmission has one-way, possess good electrical isolation capabilities and antijamming capability, working stability, contactless, long service life, highly sensitive, in addition, by the specification of adjustment member element, the power supply power-fail that can also adapt to various voltages detects demand, has extremely low cost.
More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what in above-described embodiment and instructions, describe is principle of the present utility model; under the prerequisite that does not depart from the utility model spirit and scope, the utility model also has various changes and modifications; these changes and improvements all fall in claimed scope of the present utility model, and the protection domain that the utility model requires is defined by appending claims and equivalent thereof.
Claims (2)
1. a power supply power-fail isolation detection circuit, it is characterized in that, comprise optical coupling isolator and voltage stabilizing diode, described optical coupling isolator comprises light emitting diode and phototriode, the positive pole of described light emitting diode is connected to power output end by a resistance R 1, the negative pole of described light emitting diode is connected with the negative pole of described voltage stabilizing diode, the plus earth of described voltage stabilizing diode.
2. a kind of power supply power-fail isolation detection circuit according to claim 1, is characterized in that, the collector and emitter of described phototriode connects the input pin of output display terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320778961.6U CN203672956U (en) | 2013-11-29 | 2013-11-29 | Power down insulation detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320778961.6U CN203672956U (en) | 2013-11-29 | 2013-11-29 | Power down insulation detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203672956U true CN203672956U (en) | 2014-06-25 |
Family
ID=50969234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320778961.6U Expired - Lifetime CN203672956U (en) | 2013-11-29 | 2013-11-29 | Power down insulation detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203672956U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105788212A (en) * | 2016-03-04 | 2016-07-20 | 北京理工大学珠海学院 | Intelligent wireless meter reading system and communication method thereof |
-
2013
- 2013-11-29 CN CN201320778961.6U patent/CN203672956U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105788212A (en) * | 2016-03-04 | 2016-07-20 | 北京理工大学珠海学院 | Intelligent wireless meter reading system and communication method thereof |
| CN105788212B (en) * | 2016-03-04 | 2019-01-15 | 北京理工大学珠海学院 | A kind of Intelligent wireless meter reading system and its communication means |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103390878A (en) | Lamp power output overvoltage protection circuit and lamp | |
| CN102053229A (en) | Power detection device | |
| CN202305717U (en) | AC power failure quick detection circuit | |
| CN102749501A (en) | Isolated direct current high voltage detection method and isolated direct current high voltage detection circuit | |
| CN203365654U (en) | Power supply self-detect circuit | |
| CN203672956U (en) | Power down insulation detection circuit | |
| CN103364675A (en) | Wire disconnection detecting circuit and wire disconnection detecting device | |
| CN102857177B (en) | Control and protection circuit for solid-state microwave power amplifier | |
| CN202652655U (en) | Led constant current drive circuit | |
| CN202453465U (en) | Common performance detector for light emitting diodes (LED) | |
| CN202856691U (en) | Control protection circuit of solid state microwave power amplifier | |
| CN109839561A (en) | A kind of switching signal Acquisition Circuit with status detection function | |
| CN203691707U (en) | LED load voltage detection circuit | |
| CN203643520U (en) | Optoelectronic coupler fault detector | |
| CN204719123U (en) | A kind of overvoltage undervoltage detection circuit | |
| CN203595796U (en) | LED driving fault recording apparatus | |
| CN202649287U (en) | A voltage difference detector of common-ground devices | |
| CN202634851U (en) | Constant-current driving circuit for LEDs in system test | |
| CN202586326U (en) | Switching value acquisition circuit | |
| CN204422636U (en) | Alternating current signal detection circuit | |
| CN202586331U (en) | Constant current source protection circuit | |
| CN106771948B (en) | A kind of metal-oxide-semiconductor cut-in voltage measuring device | |
| CN201788242U (en) | Protection test device of USB equipment | |
| CN204719168U (en) | A kind of current anomaly checking circuit | |
| CN201509264U (en) | LNB power supply circuit with short-circuit protection function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140625 |