CN106610443B - AC-input voltage sensing device - Google Patents
AC-input voltage sensing device Download PDFInfo
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- CN106610443B CN106610443B CN201510688322.4A CN201510688322A CN106610443B CN 106610443 B CN106610443 B CN 106610443B CN 201510688322 A CN201510688322 A CN 201510688322A CN 106610443 B CN106610443 B CN 106610443B
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- voltage sensing
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- power switch
- power
- resistor
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Abstract
A kind of alternating voltage sensing device, is electrically connected to AC power source, and alternating voltage sensing device includes first input end, the second input terminal, judging unit, first voltage sensing unit and second voltage sensing unit.First input end is electrically connected to the ground wire of AC power source, and the second input terminal is electrically connected to the firewire of AC power source.Judging unit includes the first power switch, the second power switch and output end, and the first power switch and the second power switch concatenation, output end are coupled to the second power switch.First voltage sensing unit is electrically connected to first input end and the first power switch, and second voltage sensing unit is electrically connected to the second input terminal and the second power switch.Judging unit exports normal power supply signal when the firewire and ground wire all normal power supplies of AC power source, by output end.
Description
Technical field
The present invention relates to a kind of power supply sensing device, especially a kind of firewire and ground wire electricity about sensing AC power source
Pressure makes no abnormal alternating voltage sensing device.
Background technique
In general, electronic product requires electric power ability normal operation appropriate.Therefore, in order to avoid working as AC power source
When being abnormal power supply, the problem of making electronic product that can not operate or even damage, can produce in AC power source and electronics
Whether voltage sensing device is arranged between product abnormal to sense AC power source.
Traditional alternating voltage sensing device is all the ground wire voltage and hot voltage in AC power source while being abnormal
When, the problem of AC power source that can correctly judge is lost, and output abnormality alarm signal is to reach protection electronic product
Effect.However, if can not correctly judge the ground wire electricity of AC power source when only ground wire voltage or hot voltage are abnormal
The problem of pressure or hot voltage power supply are lost, therefore protection electricity can not be reached when only ground wire voltage or hot voltage are abnormal
The effect of sub- product.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of alternating voltage sensing devices, to respective sense alternating current
Whether the power supply of the firewire and ground wire in source is abnormal.
To achieve the goals above, the present invention provides a kind of alternating voltage sensing device, it is electrically connected to AC power source, is handed over
Flowing voltage sensing device includes first input end, the second input terminal, judging unit, first voltage sensing unit and second voltage sense
Survey unit.First input end is electrically connected to the ground wire of AC power source, and the second input terminal is electrically connected to the firewire of AC power source.Judgement
Unit includes the first power switch, the second power switch, output end, photoelectrical coupler and two current-limiting resistors, and the first power is opened
It closes and the second power switch concatenation, output end is coupled to the second power switch.Photoelectrical coupler includes illuminating part and sensitive piece, hair
Light part is electrically connected to the second power switch by a current-limiting resistor therein, and sensitive piece optics is coupled to illuminating part, and is electrically connected
It is connected to output end and another current-limiting resistor.First voltage sensing unit is electrically connected to first input end and the first power switch,
Second voltage sensing unit is electrically connected to the second input terminal and the second power switch.Judging unit is in the firewire and ground of AC power source
Line all normal power supply when, by output end export normal power supply signal.
The technical effects of the invention are that:
Alternating voltage sensing device of the invention detects the ground wire voltage and hot voltage of AC power source respectively, and in ground wire
Voltage and hot voltage all normal power supplies export normal power supply signal；Occur in the ground wire voltage or hot voltage of AC power source
Output abnormality power supply signal when abnormal power supply or ground wire voltage and hot voltage are all abnormal power supply.In this way, can be quasi-
Really judge whether AC power source power supply is abnormal, avoids still exporting just when ground wire voltage or hot voltage are abnormal power supply
The situation of normal power supply signal.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is the circuit diagram of AC-input voltage sensing device of the invention；
Fig. 2 is the waveform diagram of the ground wire voltage of AC-input voltage sensing device of the invention, hot voltage and output end.
Wherein, appended drawing reference
10 judging units
100 first power switch
102 second power switch
104,108 current-limiting resistor
106 photoelectrical couplers
1060 illuminating parts
1062 sensitive pieces
110,112,130,132,134,136,150,152,154,156 resistor
12 first voltage sensing units
120 first switches
122 first constrictions
124 first resistor networks
126 first capacitor devices
128 first pressure stabilizing parts
14 second voltage sensing units
140 second switches
142 second constrictions
144 second resistance networks
146 second capacitors
148 second pressure stabilizing parts
The second input terminal of L
N first input end
OUT output end
VDC DC voltage
Vs AC power source
VSL hot voltage
VSN ground wire voltage
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
The firewire (Live wire) and ground wire of AC-input voltage sensing device of the invention to sense AC power source Vs
The input voltage of (Neutral wire), and judge whether the input voltage of firewire and ground wire is abnormal, and can in firewire and
Normal power supply signal is exported when ground wire voltage is all normal.
Fig. 1 is please referred to, is the circuit diagram of AC-input voltage sensing device of the invention.AC-input voltage sensing dress
It sets comprising first input end N, the second input terminal L, judging unit 10, first voltage sensing unit 12 and second voltage sensing unit
14。
First input end N is electrically connected to the ground wire of AC power source Vs, and the second input terminal L is electrically connected to the fire of AC power source Vs
Line.
Judging unit 10 includes output end OUT, and the first power switch 100 and the second power switch 102 of concatenation；Such as
Shown in Fig. 1, the first power switch 100 and the second power switch 102 are realized respectively with metal oxide semiconductor transistor.First
The source electrode of power switch 100 is grounded, and grid is electrically connected to first voltage sensing unit 12, and drain electrode is electrically connected to the second power switch
102 source electrode.The grid of second power switch 102 is electrically connected to second voltage sensing unit 14, and drain electrode passes through current-limiting resistor
104 are electrically connected to the illuminating part 1060 of photoelectrical coupler 106.Illuminating part 1060 can realize for example with light emitting diode, illuminating part
1060 cathode is electrically connected to current-limiting resistor 104, and anode is electrically connected to DC voltage VDC.The sensitive piece of photoelectrical coupler 106
1062 can for example be realized with photoelectric crystal, and the collector of sensitive piece 1062 is electrically connected to DC voltage VDC, and emitter-base bandgap grading is in addition to being electrically connected to
Outside output end OUT, also it is grounded by current-limiting resistor 108.
Judging unit 10 also include resistor 110,112, resistor 110 be connected across the first power switch 100 grid and
Between source electrode, resistor 112 is connected across between the grid and source electrode of the second power switch 102.
First voltage sensing unit 12 is set between first input end N and the first power switch 100, and and first input end
N and the first power switch 100 are electrically connected.First voltage sensing unit 12 includes first switch 120, the first constriction
122, first resistor network 124, first capacitor device 126 and the first pressure stabilizing part 128.One end of first switch 120 is electrically connected to
One input terminal N, the other end are electrically connected to the first constriction 122.One end of first pressure stabilizing part 128 is connected to the first power switch
100 grid, other end ground connection.First capacitor device 126 is electrically connected in parallel to the first pressure stabilizing part 128.First resistor network 124 is set
It between the first constriction 122 and the first pressure stabilizing part 128, and include multiple resistors 130~136 of series connection, the first electricity
A resistor 136 therein in resistance network 124 is electrically connected in parallel to the first pressure stabilizing part 128.As shown in Figure 1, the first pressure stabilizing part
128 can be for example with the realization of pressure stabilizing (Zener) diode, and 128 breakdown voltage of the first pressure stabilizing part is opened at least equal to first power
Close 100 conducting voltage.
Second voltage sensing unit 14 be set between the second input terminal L and the second power switch 102, and with the second input terminal
L and the second power switch 102 are electrically connected.Second voltage sensing unit 14 includes second switch 140, the second constriction
142, second resistance network 144, the second capacitor 146 and the second pressure stabilizing part 148.One end of second switch 140 is electrically connected to
Two input terminal L, the other end are electrically connected to the second constriction 142.One end of second pressure stabilizing part 148 is connected to the second power switch
102 grid, other end ground connection.Second capacitor 146 is electrically connected in parallel to the second pressure stabilizing part 148.Second resistance network 144 is set
It between the second constriction 142 and the second pressure stabilizing part 148, and include multiple resistors 150~156 of series connection, the second electricity
A resistor 156 therein in resistance network 144 is electrically connected in parallel to the second pressure stabilizing part 148.As shown in Figure 1, the second pressure stabilizing part
148 can for example be realized with zener diode, and 148 breakdown voltage of the second pressure stabilizing part is at least equal to second power switch 102
Conducting voltage.
When actual implementation, as the ground wire voltage VSN of AC power source Vs and hot voltage VSL all normal power supplies, first
The closure of switch 120 can make the ground wire voltage VSN of AC power source Vs enter first voltage sensing unit 12 by first input end N, the
Two switches 140 closure can make the hot voltage VSL of AC power source Vs enter second voltage sensing unit by the second input terminal L
14。
The voltage inputted by the ground wire (or firewire) of AC power source Vs is passing through the first constriction 122 (or the second constriction
142) in shape on resistor 136 (or resistor 156) after being divided after by first resistor network 124 (or second resistance network 144)
At cross-pressure.If the cross-pressure being formed on resistor 136 (or resistor 156) is higher than the first pressure stabilizing part 128 (or the second pressure stabilizing part
148) reverse conducting voltage, then the gate-source voltage of the first power switch 100 (or second power switch 102) is equivalent to first
The voltage at pressure stabilizing part 128 (or second pressure stabilizing part 148) both ends, and the first power switch 100 (or second power switch 102) is led
It is logical.
In short, the first power switch 100 can be made to be connected when the ground wire voltage VSN normal power supply of AC power source Vs, when
When the hot voltage VSL normal power supply of AC power source Vs, the second power switch 102 can be made to be connected.Conversely, when AC power source Vs's
When ground wire voltage VSN powers extremely, the first power switch 100 cut-off, when the hot voltage VSL of AC power source Vs powers extremely
When, the second power switch 102 can be made to end.
As the ground wire voltage VSN of AC power source Vs and hot voltage VSL all normal power supplies, the first power switch 100 and
Second power switch 102 is all connected, therefore illuminating part 1060 turns on and generates light, and sensitive piece 1062 senses the hair of illuminating part 1060
Light out, output end OUT output are in the normal power supply signal of high levle, as shown in Figure 2.
When the ground wire voltage VSN of AC power source Vs powers extremely, the cut-off of the first power switch 100, the second power switch
102 conductings, illuminating part 1060 can not generate light, therefore output end OUT output is in the abnormal power supply signal of low level.Work as alternating current
When the hot voltage VSL of source Vs powers extremely, the conducting of the first power switch 100, the cut-off of the second power switch 102, illuminating part
1060 can not generate light, therefore output end OUT output is in the abnormal power supply signal of low level, as shown in Figure 2.
Similarly, when the ground wire voltage VSN of AC power source Vs and hot voltage VSL all power extremely, the first power is opened
Pass 100 and the second power switch 102 all end, and illuminating part 1060 can not generate light, therefore output end OUT output is in low level
Abnormal power supply signal, as shown in Figure 2；Wherein, the corresponding received ground wire voltage VSN of alternating voltage sensing device and fire of the invention
The signal whether line voltage VSL corresponds to output end OUT output extremely is as shown in Table 1.
In conclusion alternating voltage sensing device of the invention detects the ground wire voltage VSN and fire of AC power source Vs respectively
Line voltage VSL, and in ground wire voltage VSN and hot voltage VSL all normal power supplies, output end OUT exports normal power supply signal；In
The ground wire voltage VSN or hot voltage VSL of AC power source Vs is abnormal power supply or ground wire voltage VSN and hot voltage VSL all
When being abnormal power supply, output end OUT output abnormality power supply signal.In this way, can accurately judge that AC power source Vs is supplied
Whether electricity is abnormal, avoids still exporting normal power supply signal when ground wire voltage VSN or hot voltage VSL are abnormal power supply
Situation.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (7)
1. a kind of alternating voltage sensing device, is electrically connected to an AC power source, which is characterized in that the alternating voltage sensing device packet
Contain:
One first input end is electrically connected to a ground wire of the AC power source；
One second input terminal is electrically connected to a firewire of the AC power source；
One judging unit includes one first power switch, one second power switch, an output end, a photoelectrical coupler and two limits
Flow resistor, first power switch and second power switch concatenation, the output end are coupled to second power switch；
The photoelectrical coupler includes an illuminating part and a sensitive piece, which is electrically connected to by a current-limiting resistor therein
Second power switch, the sensitive piece optics are coupled to the illuminating part, and are electrically connected to the output end and another current-limiting resistor；
One first voltage sensing unit is electrically connected to the first input end and first power switch；And
One second voltage sensing unit is electrically connected to second input terminal and second power switch；
Wherein, the judging unit is when firewire and ground wire all normal power supplies of the AC power source, by output end output one
Normal power supply signal.
2. alternating voltage sensing device as described in claim 1, which is characterized in that the judging unit should in the AC power source
When firewire or the ground wire are abnormal power supply or the firewire and the ground wire while being abnormal power supply, by output end output one
Abnormal power supply signal.
3. alternating voltage sensing device as described in claim 1, which is characterized in that when the ground wire and firewire power supply are normal
When, first power switch, second power switch, the illuminating part and the sensitive piece are all connected, and it is normal which exports this
Power supply signal.
4. alternating voltage sensing device as claimed in claim 3, which is characterized in that the first voltage sensing unit includes one the
One current limiting element, a first resistor network and one first pressure stabilizing part, first current limiting element are electrically connected to the first resistor network,
The first pressure stabilizing part is electrically connected to the first resistor network and first power switch, which includes one the
Two current limiting elements, a second resistance network and one second pressure stabilizing part, second current limiting element are electrically connected to the second resistance network,
The second pressure stabilizing part is electrically connected to the second resistance network and second power switch.
5. alternating voltage sensing device as claimed in claim 4, which is characterized in that the first voltage sensing unit also includes one
First switch, be set between the first input end and first current limiting element, and be electrically connected to the first input end and this first
Current limiting element, the second voltage sensing unit also include a second switch, are set to second input terminal and second current limiting element
Between, and it is electrically connected to second input terminal and second current limiting element.
6. alternating voltage sensing device as described in claim 4 or 5, which is characterized in that the first voltage sensing unit is also wrapped
Containing a first capacitor device, which is connected in parallel with the first pressure stabilizing part, which also includes one
Second capacitor, second capacitor are connected in parallel with the second pressure stabilizing part.
7. alternating voltage sensing device as claimed in claim 4, which is characterized in that the first resistor network and the second resistance
Network separately includes the resistor of multiple series connections, and the resistor in the first resistor network is in parallel with the first pressure stabilizing part
It connects, the resistor in the second resistance network is connected in parallel with the second pressure stabilizing part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510688322.4A CN106610443B (en) | 2015-10-22 | 2015-10-22 | AC-input voltage sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510688322.4A CN106610443B (en) | 2015-10-22 | 2015-10-22 | AC-input voltage sensing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106610443A CN106610443A (en) | 2017-05-03 |
| CN106610443B true CN106610443B (en) | 2019-05-24 |
Family
ID=58610779
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510688322.4A Active CN106610443B (en) | 2015-10-22 | 2015-10-22 | AC-input voltage sensing device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001045756A (en) * | 1999-07-27 | 2001-02-16 | Canon Inc | Power-supply apparatus |
| CN201167073Y (en) * | 2008-03-10 | 2008-12-17 | 上海益而益电器制造有限公司 | Electric fault breaking apparatus with a rapid reset characteristic |
| CN202939206U (en) * | 2012-12-04 | 2013-05-15 | 成都芯源系统有限公司 | Voltage detection circuit |
| CN203278632U (en) * | 2013-05-03 | 2013-11-06 | 旭隼科技股份有限公司 | Uninterrupted power supply (UPS) |
| CN103713258A (en) * | 2012-10-08 | 2014-04-09 | 力铭科技股份有限公司 | Relay failure detection circuit |
| EP2779407A3 (en) * | 2013-03-13 | 2015-02-25 | Power Integrations, Inc. | Load-selective input voltage sensor |
-
2015
- 2015-10-22 CN CN201510688322.4A patent/CN106610443B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001045756A (en) * | 1999-07-27 | 2001-02-16 | Canon Inc | Power-supply apparatus |
| CN201167073Y (en) * | 2008-03-10 | 2008-12-17 | 上海益而益电器制造有限公司 | Electric fault breaking apparatus with a rapid reset characteristic |
| CN103713258A (en) * | 2012-10-08 | 2014-04-09 | 力铭科技股份有限公司 | Relay failure detection circuit |
| CN202939206U (en) * | 2012-12-04 | 2013-05-15 | 成都芯源系统有限公司 | Voltage detection circuit |
| EP2779407A3 (en) * | 2013-03-13 | 2015-02-25 | Power Integrations, Inc. | Load-selective input voltage sensor |
| CN203278632U (en) * | 2013-05-03 | 2013-11-06 | 旭隼科技股份有限公司 | Uninterrupted power supply (UPS) |
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| Publication number | Publication date |
|---|---|
| CN106610443A (en) | 2017-05-03 |
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