CN110531219A - A kind of exchange detection method and circuit using switch drain - Google Patents
A kind of exchange detection method and circuit using switch drain Download PDFInfo
- Publication number
- CN110531219A CN110531219A CN201910837488.6A CN201910837488A CN110531219A CN 110531219 A CN110531219 A CN 110531219A CN 201910837488 A CN201910837488 A CN 201910837488A CN 110531219 A CN110531219 A CN 110531219A
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- comparator
- switch
- resistance
- power grid
- detection
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 230000003071 parasitic effect Effects 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of exchange detection methods and circuit using switch drain, it is characterized in that, the circuit includes: detection of electrical leakage module, the detection of electrical leakage module accesses power grid by firewire VL, power grid is connected with switch S1, has parasitic capacitance C1 inside the switch S1；The detection of electrical leakage module includes resistance R1, resistance R2, comparator and clamp diode, the positive input terminal of the comparator accesses the firewire VL by the resistance R1, the negative input end of the comparator is internal reference, the clamp diode and the resistance R2, the exportable high/low level of the output end of the comparator are connected between the resistance R1 and the positive input terminal of the comparator；The described method includes: using foregoing circuit, according to the high/low electrical level judging power grid of comparator output terminal output whether normal power supply.A kind of exchange detection method and circuit using switch drain of the present invention is not required to carry out track remodelling, is suitble to general distribution and the mode of connection.
Description
Technical field
The invention belongs to circuit field more particularly to a kind of exchange detection methods and circuit using switch drain.
Background technique
In general emergency system, emergency power supply is before accessing power grid, and can connect an alternating-current switch.This switch to
Control ac input signal.When switching on state, emergency power supply can access power grid, realize normal illumination.At switch
When OFF state, emergency power supply is in off-network state, and emergency power system is without output.Therefore, emergency power supply requires handing over simultaneously
When flowing grid power blackout, regardless of switch is the state of state or OFF in ON, emergency power supply can be started by requiring.
In existing technical solution, the control mode of three lines is all used.That is, individually drawing a firewire, this firewire is controlled without switch
Circuit processed, is attached directly on emergency power supply, as shown in Figure 1.In this way, when switch OFF, it still can be independent by this root
Firewire judge whether AC network is in the state of power failure, and on this basis to determine whether starting emergency power supply is to negative
It carries.
But this mode of connection is different from the common mode of connection.General distribution system is zero curve and firewire two
Wiring, the distribution and the mode of connection of emergency power supply can not be compatible with the 2 general line modes of connection, and general switch can not also make
With.Therefore, if using the control mode of three lines needing that distribution line and switch is transformed, track remodelling is inconvenient, and is taken
When it is laborious.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of exchange detection method and circuit using switch drain, purpose one
Be to provide the circuit and may not need and individually draw a firewire and judge whether power grid works normally, without to Universal connection mode with open
Pass is transformed, and more meets actual demand；It is to be produced using foregoing circuit using the capacitor in switch that purpose two, which is to provide this method,
Raw leakage current judges to switch the state of the network voltage in OFF, without the controls such as controller sensor system
System, it is convenient succinct.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of AC detection circuit using switch drain, comprising: detection of electrical leakage module, the detection of electrical leakage module pass through
Firewire VL accesses power grid, and power grid is connected with switch S1, has parasitic capacitance C1 inside the switch S1；The detection of electrical leakage module packet
Resistance R1, resistance R2, comparator and clamp diode are included, the positive input terminal of the comparator passes through described in resistance R1 access
The negative input end of firewire VL, the comparator are internal reference, are connected between the resistance R1 and the positive input terminal of the comparator
It is connected to the clamp diode and the resistance R2, the exportable high/low level of the output end of the comparator.
The technical program on power grid by connecting clamp diode and comparator, and no matter power network switch is closed or breaks
It opens, can judge whether power grid works normally according to the output of comparator.
It is furthermore preferred that the clamp diode and the resistance R2 are connected in parallel and are grounded.
It preferably, further include rectifier bridge BR, two ac input ends of the rectifier bridge BR are separately connected power grid
The output plus terminal of firewire VL and zero curve VN, the rectifier bridge BR connect VBUS interface, export negativing ending grounding, the VBUS interface
Place is connected with capacitor C2.
Preferably, the firewire VL connects the ac input end of the rectifier bridge BR by switch S1.
It is furthermore preferred that the parasitic capacitance C1 is in parallel with the switch S1.
A kind of exchange detection method using switch drain, which is characterized in that above-mentioned AC detection circuit is utilized, according to
The high/low electrical level judging power grid of comparator output terminal output whether normal power supply, the power grid normal power supply and switch S1
In the closure state, the comparator output terminal exports high level；The power grid normal power supply and switch S1, which are in, disconnects shape
When state, the comparator output terminal exports high level；When the power grid stops power supply, the comparator output terminal exports low electricity
It is flat.
Compared with prior art, the beneficial effects of the present invention are:
1, a kind of exchange detection method and circuit using switch drain of the present invention, so that whether judging power grid
It without individually drawing a firewire when power failure, therefore is not required to carry out track remodelling, is suitble to general distribution and the mode of connection, greatly place
Ac grid voltage detection.
2, a kind of exchange detection method and circuit using switch drain of the present invention, simple circuit, method is understandable,
Without intelligence control systems such as controller, sensors, the judgement that AC network has a power failure is realized by circuit.
Detailed description of the invention
Fig. 1 is the distribution system circuit diagram of three line emergency system of the prior art.
Fig. 2 is a kind of AC detection circuit figure using switch drain of the present invention.
Wherein, 1, detection of electrical leakage module；2, comparator；3, clamp diode.
Specific embodiment
In order to better understand the present invention, the content that the present invention is furture elucidated with reference to the accompanying drawings and examples, but this
Invention is not limited solely to the following examples.
Embodiment
A kind of AC detection circuit using switch drain, comprising: detection of electrical leakage module 1, detection of electrical leakage module 1 pass through fire
Line VL accesses power grid；Detection of electrical leakage module 1 includes resistance R1, resistance R2, comparator 2 and clamp diode 3, and comparator 2 is just
Input terminal accesses firewire VL by resistance R1, and the negative input end of comparator 2 is internal reference, and resistance R1 is just defeated with comparator 2
Enter and be connected with clamp diode 3 and resistance R2 between end, clamp diode 3 and resistance R2 are connected in parallel and are grounded.Comparator 2
The exportable high/low level of output end.
Circuit further includes rectifier bridge BR, two ac input ends of rectifier bridge BR be separately connected power grid firewire VL and
The output plus terminal of zero curve VN, rectifier bridge BR connect VBUS interface, export negativing ending grounding, and VBUS interface is connected with capacitor C2.
Circuit connection has switch S1, there is parasitic capacitance C1 inside switch S1, and parasitic capacitance C1 is in parallel with switch S1.Firewire VL passes through switch
The ac input end of S1 connection rectifier bridge BR.
A kind of exchange detection method using switch drain is exported using above-mentioned AC detection circuit according to comparator 2
Hold output high/low electrical level judging power grid whether normal power supply.
Power grid normal power supply and switch S1 is in the closure state, input ac voltage is by being input to ratio after resistance R1
Compared with the positive input terminal of device 2, the negative input end of comparator 2 is internal reference.The input voltage of comparator 2 is clamped the pincers of diode 3
Position is to inside ceiling voltage, to guarantee that comparator 2 will not be damaged by high pressure.In this case, the positive input terminal voltage of comparator 2
Higher than negative input end voltage, therefore, comparator 2 exports high level, is judged as power grid normal power supply.
Power grid normal power supply and when switch S1 is in an off state, friendship of the parasitic capacitance C1 in parallel with switch S1 to power grid
Galvanic electricity is pressed equivalent at a very big resistance, also, the alternating voltage of power grid can be coupled to resistance R1's by parasitic capacitance C1
One end, and it is input to by resistance R1 the positive input terminal of comparator 2 (resistance R2 is far longer than resistance R1).Comparator 2 it is just defeated
The voltage for entering end is the alternating voltage of parasitic capacitance C1 coupling.In this case, the positive input terminal voltage of comparator 2 is higher than negative
Input terminal voltage, therefore, comparator 2 export high level, are judged as power grid normal power supply.
When power grid stops power supply, power grid is in off-position, and no matter switch S1 is disconnected or is closed, firewire VL and zero curve VN
Voltage be at DC state.The positive input terminal of comparator 2 is pulled down to low level by resistance R1, and therefore, comparator 2 exports
Low level is judged as grid cut-off.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of AC detection circuit using switch drain characterized by comprising detection of electrical leakage module, the electric leakage inspection
It surveys module and power grid is accessed by firewire VL, power grid is connected with switch S1, has parasitic capacitance C1 inside the switch S1；The electric leakage
Detection module includes resistance R1, resistance R2, comparator and clamp diode, and the positive input terminal of the comparator passes through the resistance
R1 accesses the firewire VL, and the negative input end of the comparator is internal reference, and the resistance R1 is just defeated with the comparator
Enter and is connected with the clamp diode and the resistance R2, the exportable high/low level of the output end of the comparator between end.
2. a kind of AC detection circuit using switch drain according to claim 1, which is characterized in that the clamper two
Pole pipe and the resistance R2 are connected in parallel and are grounded.
3. a kind of AC detection circuit using switch drain according to claim 1, which is characterized in that further include rectification
Two ac input ends of electric bridge BR, the rectifier bridge BR are separately connected the firewire VL and zero curve VN of power grid, the rectified current
The output plus terminal of bridge BR connects VBUS interface, exports negativing ending grounding, and the VBUS interface is connected with capacitor C2.
4. a kind of AC detection circuit using switch drain according to claim 1, which is characterized in that the firewire VL
The ac input end of the rectifier bridge BR is connected by switch S1.
5. a kind of AC detection circuit using switch drain according to claim 4, which is characterized in that the parasitic electricity
It is in parallel with the switch S1 to hold C1.
6. a kind of exchange detection method using switch drain, which is characterized in that using described in claim 1-5 any one
AC detection circuit, according to the comparator output terminal output high/low electrical level judging power grid whether normal power supply, the power grid
Normal power supply and switch S1 is in the closure state, the comparator output terminal export high level；The power grid normal power supply and
When switch S1 is in an off state, the comparator output terminal exports high level；When the power grid stops power supply, the comparator
Output end exports low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910837488.6A CN110531219A (en) | 2019-09-05 | 2019-09-05 | A kind of exchange detection method and circuit using switch drain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910837488.6A CN110531219A (en) | 2019-09-05 | 2019-09-05 | A kind of exchange detection method and circuit using switch drain |
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| Publication Number | Publication Date |
|---|---|
| CN110531219A true CN110531219A (en) | 2019-12-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910837488.6A Pending CN110531219A (en) | 2019-09-05 | 2019-09-05 | A kind of exchange detection method and circuit using switch drain |
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| CN (1) | CN110531219A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112068035A (en) * | 2020-09-10 | 2020-12-11 | 西安新摩尔半导体有限公司 | Power connection detection circuit and emergency lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112068035A (en) * | 2020-09-10 | 2020-12-11 | 西安新摩尔半导体有限公司 | Power connection detection circuit and emergency lamp |
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