CN206557304U - Power failure detection circuit - Google Patents
Power failure detection circuit Download PDFInfo
- Publication number
- CN206557304U CN206557304U CN201621394569.1U CN201621394569U CN206557304U CN 206557304 U CN206557304 U CN 206557304U CN 201621394569 U CN201621394569 U CN 201621394569U CN 206557304 U CN206557304 U CN 206557304U
- Authority
- CN
- China
- Prior art keywords
- power
- module
- power supply
- resistance
- triode
- 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.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 77
- 230000005611 electricity Effects 0.000 claims description 8
- 238000013461 design Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 241000256844 Apis mellifera Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides a power failure detection circuit for detecting the power failure state of electrical equipment, which comprises a power supply module electrically connected with the output end of the electrical equipment, a load module, a detection module and a controlled module electrically connected with the detection module, wherein the power supply module comprises a power supply to be detected and a standard power supply, the output end of the power supply to be detected is electrically connected with the load module and the detection module respectively, the output end of the standard power supply is electrically connected with the load module, the utility model discloses a design of the detection module, when the electrical equipment is powered down, the power failure condition of the power supply to be detected and the standard power supply is detected respectively, when the power supply to be detected is powered down to a threshold voltage, the detection module outputs a low level, and further the controlled module receives a power failure signal, so as to achieve the function of power failure detection.
Description
Technical field
The utility model is related to detection field of circuit technology, more particularly to a kind of power-fail detection circuit.
Background technology
With the development in epoch, the continuous improvement of people's living standard, the use of electric equipment is more and more frequent, in electronics
, it is necessary to detect power-down actions under product normal operating conditions, when finding that voltage starts, system timely enters a specific shape
State, to avoid system during power down from being in the situation such as abnormal sound that uncontrolled state or appearance influence user use.
The mode that existing power-fail detection circuit is connected by using two triodes, detects an ohmically electricity of power down
Buckling, exports power-off signal, and then reach the effect of detection of power loss when the ohmically voltage of power down is less than default magnitude of voltage
Really.
Existing power-fail detection circuit is due to only detecting an ohmically voltage change of power down, when the power down of power down resistance
When voltage change is smaller, existing power-fail detection circuit is difficult to the generation for detecting power down, and then does not reach the work(of detection of power loss
It can make it that the sensitivity of detection of power loss is relatively low.
Utility model content
Based on this, mesh of the present utility model is to provide a kind of sensitivity high power-fail detection circuit.
A kind of power-fail detection circuit, the power-down state for detecting electric equipment, including with the electric equipment output end
The power module of electric connection, the load blocks being electrically connected with the power module, detection module and with the detection
The controlled module that module is electrically connected with；
The power module includes power supply to be detected and reference power supply, the output end of the power supply to be detected respectively with it is described
Load blocks and the detection module are electrically connected with, and the output end of the reference power supply is electrically connected with the load blocks, when
When power down occurs for the electric equipment, detect that the power supply to be detected and the reference power supply fall respectively by the detection module
Electric situation reaches the function of detection of power loss.
Above-mentioned power-fail detection circuit cost is low, and by the design of the detection module, when the electric equipment falls
By detecting the power supply to be detected and the reference power supply power-down conditions respectively after electricity, when the power supply power-fail to be detected to threshold
Detection module output low level during threshold voltage, and then cause the controlled module to receive power-off signal, so as to reach
The function of electro-detection.
Further, the detection module includes first resistor, the second resistance connected with the first resistor and is located at
Triode between the first resistor and the second resistance.
Further, one end of the first resistor is connected with the base stage of the triode, the other end and the triode
Emitter stage be connected.
Further, it is provided with the power supply to be detected in measuring resistance to be checked, the reference power supply and is provided with measuring resistance, institute
The resistance for stating measuring resistance to be checked is more than the resistance of the measuring resistance.
Further, the colelctor electrode of the triode is provided with pull down resistor, and the pull down resistor is used to work as three pole
Pipe drags down the voltage of the colelctor electrode when ending.
Further, the triode uses PNP type triode.
Further, the controlled module is timer, buzzer, LED or function module circuit.
Further, a grounding resistance is in series with the controlled module, the grounding resistance is used for when power down inspection
Slowdown monitoring circuit plays pull down resistor when exporting low level.
Further, the both end voltage value of the first resistor is more than or equal to the cut-in voltage value of the triode, with
Make to turn on during the triode normal condition.
Brief description of the drawings
The structured flowchart for the power-fail detection circuit that Fig. 1 provides for the utility model first embodiment；
The electrical block diagram for the power-fail detection circuit that Fig. 2 provides for the utility model first embodiment；
The electrical block diagram for the power-fail detection circuit that Fig. 3 provides for the utility model second embodiment；
Essential element symbol description
Following embodiment will further illustrate the utility model with reference to above-mentioned accompanying drawing.
Embodiment
For the ease of more fully understanding the utility model, the utility model is carried out below in conjunction with related embodiment accompanying drawing
It is further explained.Give embodiment of the present utility model in accompanying drawing, but the utility model be not limited in it is above-mentioned preferred
Embodiment.Conversely there is provided the purpose of these embodiments be in order that open face of the present utility model more fully.
Refer to Fig. 1 to Fig. 2, a kind of power-fail detection circuit 100 is used for the power-down state for detecting electric equipment 50, including with
The power module 10 that the output end of electric equipment 50 is electrically connected with, the load mould being electrically connected with the power module 10
Block 20, detection module 30 and the controlled module 40 being electrically connected with the detection module 30, the power module 10 includes to be checked
Survey power supply 11 and reference power supply 12, the output end of the power supply 11 to be detected respectively with the load blocks 20 and the detection mould
Block 30 is electrically connected with, and the output end of the reference power supply 12 is electrically connected with the load blocks 20, when the electric equipment 50
During generation power down, the power supply to be detected 11 and the power-down conditions of the reference power supply 12 are detected by the detection module 30 respectively
Reach the function of detection of power loss.
In the present embodiment, the voltage of the reference power supply 12 is 12V, and the voltage of the power supply 11 to be detected is 5V；
Wherein, the load blocks 20 are made up of resistance, and the load blocks 20 are used to prevent the power-fail detection circuit
The short circuit caused during 100 power supply suddenly, and then improve the security performance of the power-fail detection circuit 100.
In the present embodiment, by the design of the detection module 30, by dividing after power down occurs for the electric equipment 50
The power supply to be detected 11 and the power-down conditions of the reference power supply 12 are not detected, when the power supply 11 to be detected is power-down to threshold value electricity
The output of detection module 30 low level during pressure, and then cause the controlled module 40 to receive power-off signal, so as to reach
The function of electro-detection.
The detection module 30 includes first resistor 31, the second resistance 32 connected with the first resistor 31 and located at institute
State the triode 33 between first resistor 31 and the second resistance 32, one end of the first resistor 31 and the triode 33
Base stage be connected, the other end is connected with the emitter stage of the triode 33；
Wherein, because existing power-fail detection circuit is due to using two triode detection modes so that cost is higher not
Beneficial to batch production, and the work(of detection of power loss can just only be reached by the design of a triode 33 in the present embodiment
Energy；
By the design of the first resistor 31, the second resistance 32 and the triode 33, when the electric equipment
50 do not occur power down, and the first resistor 31 and the second resistance 32 carry out two ends in partial pressure, and the first resistor 31
Voltage the triode 33 is turned on so that the colelctor electrode of the triode 33 exports high electricity to the controlled module 40
It is flat.
Further, the resistance of the second resistance 3 is more than the resistance of the first resistor 31, so that the triode 33
Turned on during normal condition, and then working foundation is provided for the power-fail detection circuit 100.
In the present embodiment, be provided with standard is provided with measuring resistance to be checked, the reference power supply 12 in the power supply 11 to be detected
Resistance, the resistance of the measuring resistance to be checked is more than the resistance of the measuring resistance, so that the voltage on the power supply to be detected 11
Power down is faster than the voltage power down on the reference power supply 12, and then when occurring power down, the electricity at the two ends of power supply 11 to be detected
Pressure is fallen before.
The colelctor electrode of the triode 33 is provided with pull down resistor 34, and the pull down resistor 34 is used to work as the triode 33
The voltage of the colelctor electrode is dragged down during cut-off, so that the colelctor electrode of the triode 33 sends low to the controlled module 40
Level signal, the controlled module 40 is connected to the low level signal and makes corresponding action, so as to complete the detection of power loss
The testing process of circuit 100.
The be poles conducting voltage 0.7V of the triode 33 (just lead when i.e. be voltage across poles is more than or equal to 0.7V by triode
It is logical), blanking voltage 0.5V (triode ends when i.e. be voltage across poles is less than or equal to 0.5V)；
The resistance of first resistor 31 described in the present embodiment is R1, and the resistance of the second resistance 32 is R2, described first
Both end voltage (i.e. the voltage of the be interpolars of triode 33) on resistance 31 is：
(12V-5V)*R1/(R1+R2)
When the be poles of the triode 33 will at least be reduced from be voltage across poles when being conducting to cut-off：0.2V*(0.7V-
0.5V), equivalent to reducing 2/7* (0.2V/0.7V)
Namely 12V-5V will at least be reduced to (1-2/7) * (12V-5V) i.e. 5V detection circuits and can just act, i.e. 12V drops
The power-fail detection circuit will be acted when low 2V (i.e. 7V-5V) is to 10V, and existing power-fail detection circuit needs are described to be checked
Power-off signal, and then the existing detection of power loss electricity of remolding sensitivity of the present embodiment can just be detected to 8.57V by surveying the power down of power supply 11
Lu Gao.
In the present embodiment, what the triode 33 played a part of is switch, when 50 normal power supply of electric equipment
The triode 33 is turned on, when power down occurs for the electric equipment 50 so that the both end voltage drop in the first resistor 31
It is low, and then the triode 33 is changed into cut-off state from conducting state, the colelctor electrode of the triode 33 is by the drop-down
It is low level that resistance 34, which is drawn, and the triode 33 uses PNP type triode.
The controlled module 40 is timer, buzzer, LED or function module circuit, when the controlled module 40 is
During the timer, the controlled module 40 plays the effect of timing, for record the electric equipment 50 from normal condition to
The time that power-down state needs to spend is detected, so as to reach the effect for detecting the power down speed of electric equipment 50；
When the controlled module 40 is buzzer, the controlled module 40 plays a part of warning, when the electrical equipment is set
Standby 50 1 occur power down, and the both end voltage detected by the design of the detection module 30 on the power supply to be detected 11 occurs
Change, so that the colelctor electrode that the triode 33 ends the triode 33 sends the low level signal, the honeybee
Ring device receives the electric equipment 50 described in prompting user that beeped after the low level signal and there occurs power down；
When the controlled module 40 is LED, the controlled module 40 plays a part of warning, when the electric equipment
50 1 occur power down, detect the both end voltage on the power supply to be detected 11 by the design of the detection module 30 and there occurs
Change, so that the colelctor electrode that the triode 33 ends the triode 33 sends the low level signal, the LED
Receive electric equipment 50 described in bright light prompting user is sent after the low level signal and there occurs power down.
The both end voltage value of the first resistor 31 is more than or equal to the cut-in voltage value of the triode 33, so that described
Turned on during 33 normal condition of triode.
Flow of the present utility model is：When power down occurs for the electric equipment 50, the power supply 11 to be detected and described
The both end voltage reduction of reference power supply 12, when the resistance due to the power supply 11 to be detected is more than the resistance in the reference power supply 12
Value so that the both end voltage of the power supply 11 to be detected is reduced must be faster than the both end voltage of the reference power supply 12, and then leads to again
After the partial pressure for crossing the first resistor 31 and the second resistance 32, quickly the triode 33 can be cut from normal condition
Cut-off is shifted to, then passes through the design of the pull down resistor 34 so that the colelctor electrode of the triode 33 is to the controlled mould
Block 40 sends low level, so as to reach the effect of detection of power loss.
The utility model cost is low and sensitivity is high, when power down just occurs for the electric equipment 50, by being treated described in detection
The change of the both end voltage of power supply 11 and the reference power supply 12 is detected, quickly causes the triode 33 to be changed into cut-off state
And power-off signal is sent to the controlled module 40, so as to reach the effect of detection of power loss.
Referring to Fig. 3, the electrical block diagram of the power-fail detection circuit provided for the utility model second embodiment, should
The structure of second embodiment and first embodiment is more or less the same, and its difference is, in controlled module 40 described in the present embodiment also
It is in series with a grounding resistance 41；
The grounding resistance 41 is used to prevent that the controlled module 40 from being influenceed by noise signal, so improve it is described by
The reliability of module 40 is controlled, and plays pull down resistor, Jin Erti when the power-fail detection circuit 100 will export low level
The high sensitivity of the power-fail detection circuit 100.
Above embodiment described technical principle of the present utility model, these descriptions are intended merely to explain of the present utility model
Principle, and the limitation of the utility model protection domain can not be construed in any way.Based on explanation herein, the skill of this area
Art personnel, which would not require any inventive effort, can associate other embodiments of the present utility model, and these modes are all
It will fall into protection domain of the present utility model.
Claims (9)
1. a kind of power-fail detection circuit, the power-down state for detecting electric equipment, it is characterised in that：Including being set with the electrical equipment
The power module that standby output end is electrically connected with, the load blocks being electrically connected with the power module, detection module and with
The controlled module that the detection module is electrically connected with；
The power module includes power supply to be detected and reference power supply, the output end of the power supply to be detected respectively with the load
Module and the detection module are electrically connected with, and the output end of the reference power supply is electrically connected with the load blocks, when described
When power down occurs for electric equipment, the power supply to be detected and the reference power supply power down feelings are detected by the detection module respectively
Condition reaches the function of detection of power loss.
2. power-fail detection circuit according to claim 1, it is characterised in that：The detection module include first resistor, with
The second resistance and the triode between the first resistor and the second resistance of the first resistor series connection.
3. power-fail detection circuit according to claim 2, it is characterised in that：One end of the first resistor and three pole
The base stage of pipe is connected, and the other end is connected with the emitter stage of the triode.
4. power-fail detection circuit according to claim 1, it is characterised in that：Electricity to be detected is provided with the power supply to be detected
Measuring resistance is provided with resistance, the reference power supply, the resistance of the measuring resistance to be checked is more than the resistance of the measuring resistance.
5. power-fail detection circuit according to claim 2, it is characterised in that：The colelctor electrode of the triode is provided with drop-down
Resistance, the pull down resistor is used for the voltage that the colelctor electrode is dragged down when the triode ends.
6. power-fail detection circuit according to claim 2, it is characterised in that：The triode uses PNP type triode.
7. power-fail detection circuit according to claim 1, it is characterised in that：The controlled module be timer, buzzer,
LED or function module circuit.
8. power-fail detection circuit according to claim 1, it is characterised in that：Ground connection electricity is in series with the controlled module
Resistance, the grounding resistance is used to play pull down resistor when the power-fail detection circuit will export low level.
9. power-fail detection circuit according to claim 2, it is characterised in that：The both end voltage value of the first resistor is more than
Or equal to the cut-in voltage value of the triode, so as to be turned on during the triode normal condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621394569.1U CN206557304U (en) | 2016-12-19 | 2016-12-19 | Power failure detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621394569.1U CN206557304U (en) | 2016-12-19 | 2016-12-19 | Power failure detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206557304U true CN206557304U (en) | 2017-10-13 |
Family
ID=60358526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621394569.1U Active CN206557304U (en) | 2016-12-19 | 2016-12-19 | Power failure detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206557304U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110806504A (en) * | 2018-08-03 | 2020-02-18 | 炬芯（珠海）科技有限公司 | Charging power supply detection circuit and detection method |
-
2016
- 2016-12-19 CN CN201621394569.1U patent/CN206557304U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110806504A (en) * | 2018-08-03 | 2020-02-18 | 炬芯（珠海）科技有限公司 | Charging power supply detection circuit and detection method |
| CN110806504B (en) * | 2018-08-03 | 2021-11-02 | 炬芯科技股份有限公司 | Charging power supply detection circuit and detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205038248U (en) | Sub - temperature of band edge detects ammeter of function | |
| CN103605017A (en) | Detection method of vehicle switch quantity signal | |
| CN104216494A (en) | Single chip microcomputer controlled power grid detection and reset circuit | |
| CN208508514U (en) | A kind of short-circuit protection circuit of switching circuit | |
| CN206329476U (en) | Water pump controller | |
| CN203358368U (en) | Fault latch circuit of electric car controller | |
| CN206557304U (en) | Power failure detection circuit | |
| CN201122942Y (en) | Reset circuit | |
| CN105242766A (en) | Voltage leap detection circuit, reset circuit and electronic device | |
| CN202502143U (en) | Voltage detection circuit for inductive sanitary ware | |
| CN104600660A (en) | Low-power-consumption short circuit protection circuit | |
| CN204349330U (en) | Self-check type state indicator | |
| CN204166400U (en) | A kind of low-power consumption level alarm for water | |
| CN203870120U (en) | Generator rotating speed detection controller | |
| CN204719122U (en) | A kind of voltage detecting warning circuit | |
| CN211505684U (en) | Power failure detection alarm circuit for power consumption equipment | |
| CN204945993U (en) | A kind of watchdog circuit being applicable to Safety output | |
| CN212483802U (en) | Power failure detection circuit | |
| CN207472952U (en) | A kind of power-fail detection circuit and protection circuit | |
| CN207937526U (en) | Power-fail detection circuit on charging pile | |
| CN203350340U (en) | Full-range low power consumption DC voltage detecting circuit | |
| CN202853050U (en) | Detection device for preventing input/output (I/O) port humidifier from drying out | |
| CN205139833U (en) | Voltage jump detection circuitry , reset circuit and electron device | |
| CN201926699U (en) | Low-voltage circuit for power failure detection | |
| CN207051764U (en) | Key wakeup circuit and its manufactured meter reading terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |