CN102916388B - Supply voltage monitor - Google Patents
Supply voltage monitor Download PDFInfo
- Publication number
- CN102916388B CN102916388B CN201210257235.XA CN201210257235A CN102916388B CN 102916388 B CN102916388 B CN 102916388B CN 201210257235 A CN201210257235 A CN 201210257235A CN 102916388 B CN102916388 B CN 102916388B
- Authority
- CN
- China
- Prior art keywords
- supply voltage
- circuit
- undertension
- overvoltage
- event
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
A supply voltage monitor includes a switch circuit that enables coupling of an AC power supply to a load. A control circuit switches the switch circuit from a non-conductive state to a conductive state when a supply voltage signal is between a first over-voltage threshold and a first under-voltage threshold. The control circuit records an over-voltage event and maintains the switch circuit in the conductive state when the supply voltage signal exceeds a second, higher over-voltage threshold. The control circuit switches the switch circuit to a non-conductive state when the supply voltage signal exceeds a third, highest over-voltage threshold. The control circuit records an under-voltage event and maintains the switch circuit in the conductive state when the supply voltage signal falls below a second, lower under-voltage threshold. The control circuit switches the switch circuit to the non-conductive state when the supply voltage signal falls below a third, lowest under-voltage threshold.
Description
Technical field
The present invention relates to power protection field, more particularly to a kind of supply voltage watch-dog.
Background technology
Many available power protective equipments, such as surge protector（SPD）And compound filter, all with one certainly
Dynamic on-off circuit, can disconnect power supply unit according to different power supply wiring trouble and/or overvoltage or undertension condition
Alternating current power supply.The circuit of detection overvoltage or undertension, needed before alternating current power supply flows through equipment output and attachment means
Reach rated line voltage.Linear voltage situation, such as voltage are raised and overvoltage, can cause certain electrical protection apparatus part
（Such as metal-oxide varistor and other suppressor elements）Failure.Additionally, the power supply of some equipment is by continuing
Overvoltage when have damage.Connection equipment fault, such as short circuit, are caused by undertension, and then cause electrical protection apparatus
Or occur potential, have harm or unsafe high-intensity currrent in connection equipment itself.
Although the advantage of power protective equipment is according to failure condition, such as overvoltage or undertension, disconnection pair sets
Standby power supply, resulting power breakdown can bring inconvenience in many cases or problem.In order to avoid frequently occurring electric power
Interrupt, one of solution is that voltage level when power supply is disconnected is arranged on outside normal operation range, but is still being set
For in the range of can bearing.However, the method may result in frequently occurring or long-term with overvoltage or undertension
Situation, such case has the less scale for being difficult to be aware, and this is eventually resulted in surge protector or connection equipment
Damage.Therefore, there is still a need for a kind of supply voltage monitoring system, can provide in the case where frequent power breakdown is not caused
Overvoltage and undertension are protected, while providing sufficiently to the notice of small-scale overvoltage and undertension showing to be
System in or with the problem for being connected device-dependent.
The content of the invention
Described herein is a kind of supply voltage watch-dog, for monitoring the over-voltage condition of alternating current power supply.
The watch-dog includes that an on-off circuit, a power supply signal adjust circuit and a control circuit.The switch electricity
The input lead that can be connected with alternating current power supply is optionally connected to the output conductor that can be connected with load on road.For example, switch
Circuit can be located between the input of watch-dog and the live wire wire of outfan.In conducting state, on-off circuit electrically connects
Input lead and output lead are connect, and in nonconducting state, it is electrical with output lead that on-off circuit then disconnects input lead
Connection.Power supply signal adjusts circuit and produces a supply voltage signal for representing AC supply voltage.For example, supply voltage signal
It is proportional to the voltage between the live wire of alternating current power supply and zero line.Supply voltage signal during control circuit monitoring overvoltage, control
The on-off circuit is made according to specific condition to record overvoltage event.
Especially, when on-off circuit is located at nonconducting state, according between first " reconstruction " overvoltage threshold and the
Supply voltage signal between one " reconstruction " undertension threshold value, is conducting shape by control circuit controlling switch circuit conversion
State.Once on-off circuit is in the conduction state, then when supply voltage signal is higher than the second of reconstruction overvoltage threshold more than one
During individual " record " overvoltage threshold, control circuit can record overvoltage event and tend to remain on on-off circuit.Additionally, working as
When supply voltage signal is higher than the 3rd "off" overvoltage threshold of record overvoltage threshold more than one, control circuit can be controlled
On-off circuit processed is converted to nonconducting state from conducting state, and records another overvoltage event.One overvoltage thing of record
Part includes that being incremented by overvoltage event counts and overvoltage event timing.
Similarly, once on-off circuit is in the conduction state, when supply voltage signal less than one less than reconstruction voltage not
During second " record " undertension threshold value of sufficient threshold value, control circuit meeting recording voltage deficiency event, and protect on-off circuit
Hold conducting state.Additionally, when supply voltage signal less than one less than the 3rd " open circuit " voltage of recording voltage deficiency threshold value
During not enough threshold value, control circuit meeting controlling switch circuit is converted to nonconducting state from conducting state, and records another voltage
Not enough event.
With reference to preferred embodiments it is defined below, description and accompanying drawing, the present invention it is aforesaid and other the characteristics of and advantage
Must further to define, wherein the reference number in each diagram is used to specify similar component.Although these descriptions are in order to more
The details of the present invention is specifically described, but still is understandable that those skilled in the art can be on the basis of being described herein
Expect a lot of other variants.
Description of the drawings
Fig. 1 be it is a kind of can selectivity connect an alternating current power supply to the supply voltage watch-dog of load equipment concrete reality
Apply the block diagram of example.
Fig. 2 illustrates the on-off circuit during performance supply voltage level of supply voltage watch-dog shown in Fig. 1 with graph mode
State.
Fig. 3 illustrates the mode of operation of supply voltage watch-dog shown in Fig. 1 in state diagram mode.
Fig. 4 A and Fig. 4 B are described under the conditions of supply voltage, operated one of supply voltage watch-dog shown in Fig. 1
The functional flow diagram of logical instance.
Fig. 5 is described under the conditions of supply voltage, another logic reality that supply voltage watch-dog shown in Fig. 1 is operated
The functional flow diagram of example.
Fig. 6 is the schematic diagram of the specific embodiment of a power filter circuit comprising supply voltage watch-dog shown in Fig. 1.
Specific embodiment
Supply voltage watch-dog described in the invention is monitored using multiple voltage threshold levels and is connected with load equipment
AC supply voltage, and can, perform different operating in the case where for example wherein there is threshold value to be crossed.For example, if
The voltage of alternating current power supply exceedes the overvoltage threshold of " record ", i.e., can be recorded and carry out examination in real time or after a while and assessment,
Determine whether there is certain problem.If AC supply voltage exceedes higher " open circuit " overvoltage threshold, can be recorded simultaneously
Load equipment and alternating current power supply are disconnected, load equipment and watch-dog itself is protected.Similarly, if AC supply voltage is less than
The undertension threshold value of " record ", i.e., can be recorded, and if AC supply voltage is less than lower "off" voltage threshold,
Can be recorded, and the equipment and alternating current power supply are disconnected.By this way, load equipment and watch-dog can be protected from serious
The infringement of overvoltage and undertension, and less overvoltage and undertension can be monitored without causing power supply at once
Interrupt.If the less low-voltage of continued presence and over-voltage condition, then can at the convenient time carry out correction measurement.
Fig. 1 be it is a kind of can selectivity connect an alternating current power supply to the supply voltage watch-dog 100 of load equipment tool
The block diagram of body embodiment.As will be discussed in more detail, supply voltage watch-dog 100 can be merged into various electric power
In protection and adjustment equipment, such as surge protector（SPD）With in compound filter playing various being able to ensure that to load
The other functions of the reliable energy supply of equipment conveying.
As shown in figure 1, in feeder ear side, the live wire of the input terminal of watch-dog 100, zero line and ground wire are arranged to
It is connected with the respective terminal of alternating current power supply electric power system（For example, terminals can be an insertion AC Power supply socket
Plug）.In load side, the live wire of outlet terminal, zero line and ground wire, it is arranged to corresponding to one or more load equipments
Terminals be connected.The live wire of equipment and the wire of zero line, provide input directly to respectively the terminals of the live wire and zero line for exporting
Between route.
One on-off circuit 140 is distributed along the route of live wire wire, and selectively will connect positioned at being input into and exporting live wire
Input between line end（Supply side）Live wire wire and outfan（Load side）Live wire wire be attached.In conducting shape
During state, on-off circuit 140 is electrically connected with input live wire wire with output live wire wire, in nonconducting state, on-off circuit
140 electrically disconnect is input into live wire wire with output live wire wire.On-off circuit 140 can adopt any in various switching devices
A kind of device.For a kind of selection, on-off circuit 140 can include an electromagnetic relay（EMR）, its repeat circuit
The voltage of coil is used to close normally opened relay contact, and so as to closing/disconnecting the line between live wire wire is input into and exports
Road seriality, and alternating current is optionally conveyed to the outfan of watch-dog and the equipment of connection.Select to come for another kind of
Say, on-off circuit 140 can adopt a kind of power semiconductor, such as a kind of bilateral triode switch.
Also another kind of to select, on-off circuit 140 can adopt a kind of hybrid switch circuit, including a power semiconductor
With the parallel combination of an electromagnetic relay, as Application No. 2011/0063759 U.S. Patent application described in that
Sample, the object disclosed in this application is used as a reference.In this configuration, be capable of achieving there is minimum on state voltage to decline and
The operating passing zero switch of power attenuation.Under correct design, according to the automatic switch that overvoltage or undertension are controlled
Circuit can protect easily damaged plant component downstream（For example, metal-oxide varistor（MOV）With other suppressor units
Part）From the damage that overvoltage and undertension bring.Except protecting easily damaged apparatus assembly, these circuits also to protect meeting
By the connection equipment that overvoltage or undertension are damaged.
On-off circuit 140 as shown in Figure 1 is arranged to close/disconnect the company between the live wire wire of input and output
Connect, or, the on-off circuit for controlling in the same fashion may be located between the zero line wire of input and output, or switch can be same
When in the live wire of watch-dog 100 and the circuit of zero line.
One power supply signal adjusts the input that circuit 110 is connected to watch-dog 100（Supply side）Live wire and zero line are led
Line, and a supply voltage signal V is formed from these ac supply signalsln, supply voltage signal VlnExpression can be used
Voltage between the live wire and zero line of the input of the process of control circuit 130.For example, control circuit 130 can be one micro-
Controller.Supply voltage signal VlnFeature depend on microcontroller adopt particular configuration.For example, in order that microcontroller
Device can receive a kind of ac voltage signal, and power supply signal adjusts the supply voltage signal V that circuit 110 is producedln, being capable of conduct
The version that voltage ladder declines between live wire and zero line.For a kind of microcontroller for receiving d. c. voltage signal,
Power supply signal adjusts the supply voltage signal V that circuit 110 is producedlnCan be used as direct current signal（Such as a kind of analogue signal）, make
The value of the signal is located in the opereating specification of microcontroller, is directly proportional to the voltage peak between power supply live wire and zero line.For example,
It can be a simple potentiometer that power supply signal adjusts circuit 110, and control circuit 130 may may require that a specific A/D
Analog digital conversion is input into.If control circuit 130 has a kind of 0 to V of standardddThe A/D analog digital conversion input of type, then power
Circuit for signal conditioning 110 can include a quasi-peak value detecting circuit.A kind of selection that specific embodiment described here is used,
Voltage between power supply live wire and zero line is expressed as into Vln, to detect overvoltage and undertension, for being selected according to another kind,
Voltage between power supply live wire and ground wire can also be expressed as VlgTo realize the purpose.
Power circuit 120 is connected with the live wire of the supply side of watch-dog 100 and the wire of zero line, and produces operational control electricity
Road 130 and the d. c. voltage signal needed for on-off circuit 140.In the example depicted in figure 1, the first direct current power source voltage V of generationDD
There is provided to control circuit 130, and the second direct current power source voltage V for producingSWThen provide to on-off circuit 140.Although power supply is electric
These DC voltages that road 120 produces, come from the AC signal of the live wire of input to zero line, and power circuit 120 still may be used
To be an adjustable DC source, by its direct current output（For example, its output is adjusted）Remain very close to defeated in exchanging
Enter the nominal of the variation of voltage.In order to DC voltage is consistent with the change of supply voltage, can adopt
With various regulation forms.It is, for example possible to use a kind of Zener diode actuator, including with one or more poles of Zener two
The current-limiting resistor of pipe series connection.The voltage at Zener diode two ends changing with the electric current series for flowing through the equipment and having slight change
Change.Others enable the regulative mode that VD exceedes AC supply voltage scope to include pulse width modulation
With feedback regulation method.
Control circuit 130 has a processor（For example, a microprocessor, a microcontroller, a numeral letter
Number processor etc.）, it is able to carry out program command（For example, software）To realize various operations and task.For example, control circuit 130
The data that receive and order can be annotated, performed calculating, storage information, and be controlled the on-off circuit of watch-dog 100
140 and a display 150.Display 150 can be any one in various display mechanisms（For example, LCD display, LED show
Show device etc.）, there is provided visual supply voltage monitoring information, and the outer housing or shell part of such as watch-dog 100 can be mounted to
Point such that it is able to conveniently check in operation.
Control circuit 130 also has storage performance, can store the information about overvoltage and undertension, event meter
Number information, clocking information and other data or information.The internal memory or memorizer of control circuit 130 also can be stored by control circuit
130 computing device programmed instruction performed when operating（For example, software）.Therefore, operation described herein can with method
By performing the non-transitory computer readable medium being stored in the one or more processors of control circuit 130（For example, it is soft
Part）On instruction realizing.As used herein, " computer readable medium " refers to non-transitory（Tangible）Medium
（For example, memorizer or internal memory）.The memory/storage of control circuit 130 is that a kind of tangible processor is readable or computer can
The storage device of reading, can store or use command code, when the computing device by control circuit 130, make computing device
Function described herein.When control circuit 130 performs the software of storage to run by a programmable microprocessor
When, a kind of selectable processing environment is a kind of fixed data treatment element, such as one Application-Specific Integrated Circuit
（ASIC）, configured by fixed hardware logic, execution logic circuit function.Alternatively possible data processing circumstance is
One kind is related to one or more field programmable logic devices, or fixing process element, firmware and/or programmable logic device
Combination.The memorizer of control circuit 130 also includes a nonvolatile memory, such as one EEPROM, for storing event
Information, such as overvoltage and the number of times of undertension event and related clocking information.
Running voltage V that control circuit 130 is produced by power circuit 120DDPower supply, and by receive live wire and zero line it
Between voltage VlnTo assess whether to there is undertension or overvoltage condition.Control circuit 130 is according to the power supply electricity for receiving
Pressure signal Vln, switch controlling signal is provided to on-off circuit 140, and provide display control signal to display 150.For example,
Control circuit 130 can make display 150 show the count information of overvoltage and undertension event.As mentioned below, if
The equipment that overvoltage or undertension situation can potentially damage connection, then microcontroller signal to on-off circuit 140 is passed
Switch controlling signal is passed, the power supply to equipment accessory power outlet is disconnected, so as to protection equipment.
In the example shown in Fig. 1, control circuit 130 also includes a serial communication interface（SCI）, it is allowed to data
（For example, state and event history）Transmit to external equipment from control circuit 130, and from external equipment to control circuit 130
Conveying data（For example, control parameter）.
Control circuit also has a timing module, for recording the time（For example, second, minute, hour and natural law, etc.）.
For example, timing module is able to maintain that operation clock or one time experienced apart from last time event of offer, so as to recording and depositing
The reference time of storage overvoltage and undertension event.
According to one embodiment, supply voltage signal VlnAn analog DC signal, the analog DC signal with from
Input live wire to the wire of zero line is directly proportional, and the firmware of control circuit 130 or software cycle ground are to supply voltage signal
VlnIt is simulated numeral（A/D）Conversion, converts thereof into digital signal, for example, is represented with hexadecimal " Hex " value.Will be with
The directly proportional hexadecimal Hex values of supply voltage compare with the threshold value of various storages（For example, store in firmware）：
OVrestore（Overvoltage is rebuild）, OVrecord（Overvoltage is recorded）, OVshutdown（Overvoltage open circuit）, UVrestore（Undertension weight
Build）, UVrecord（Undertension is recorded）And UVshutdown（Undertension open circuit）.Based on supply voltage signal value VlnWith these storages
The comparison of the threshold value deposited, control circuit 130 determines that running voltage can be acceptance, still there is undertension（UV）
Or overvoltage（OV）Situation.For example, an American Power, acquiescence " firmware " hexadecimal Hex values can adopt following confession
Piezoelectric voltage level：
OVshutdown（OVsh） 150 Vrms
OVrecord（OVrc） 135 Vrms
OVrestore（OVrs） 130 Vrms
UVrestore（UVrs） 105 Vrms
UVrecord（UVrc） 100 Vrms
UVshutdown（UVsh） 80 Vrm
According to these threshold values to control circuit 130 operation such as Fig. 2 in chart shown in, describe supply voltage watch-dog
100 play on-off circuit state when operational voltage level is acted on, and the chart with reference to shown in Fig. 3 illustrates supply voltage watch-dog 100
Mode of operation.In order to reach concordance, when referring to supply voltage signal VlnWith during comparison between various threshold values, operator
<,>,WithIt is used for following description.It is understood, however, that the invention is not limited in that any one detects whether to reach
To the specific embodiment of threshold value（For example, by exceed/being not reaching to the threshold value or being only equal to the threshold value come really whether
Meet a threshold value）.Therefore within the scope of the present invention, symbol<WithIt is used interchangeably, symbol>WithIt is used interchangeably.
The reconstruction threshold level of overvoltage and undertension（OVrsAnd UVrs）Running voltage " normal " scope is represented respectively
Upper and lower bound（For example, overvoltage or undertension state）.For example, one is located in the range of the Vrms of 105 Vrms to 130
AC supply voltage may be considered the rated operational voltage level for being sufficiently close to 120 Vrms, this may be considered can
Receive.
On startup（State 310 shown in Fig. 3）If, supply voltage signal VlnCan be acceptance（For example, between mistake
Between voltage and the reconstruction threshold value of undertension, UVrsAnd OVrs）, then control circuit 130 performs " power cycles " program, will
Watch-dog 100 switchs to normal operating conditions 320.In this case, control circuit 130 in " energization " state to on-off circuit
140 provide switch controlling signal, so as to open（Closure）On-off circuit 140, for example, is converted to conducting state, to connect input
The live wire wire of power supply and the live wire wire of output loading, so as to transmit electrical power to the equipment accessory power outlet in downstream, realize negative
The connection of load equipment and alternating current power supply.Fig. 2 lower sections centre position denotes this switching control state, and its on off state is closure
（Connection/conducting）, and supply voltage signal VlnPositioned at UVrsAnd OVrsBetween.
If, on startup, supply voltage signal VlnOutside reconstruction threshold level（For example, Vln > OVrsOr Vln
< UVrs）, then control circuit 130 constitutes loop, before performing power cycles program and being changed into normal operating conditions 320,
Continuous detecting supply voltage signal Vln, until it is in the range of acceptable level（For example, UVrs Vln OVrs）.
In normal operating conditions 320, control circuit 130 maintains supply voltage signal V periodically to receivinglnEnter
Row A/D analog digital conversion, determines whether running voltage is acceptable, or whether can develop into overvoltage to a certain degree or electricity
Pressure is not enough.If as shown in figure 3, supply voltage signal VlnIncrease above overvoltage record threshold value OVrcWhen, control circuit
130 are made a response by being converted into record 330 pairs of states of overvoltage condition, perform one kind " overvoltage record " program.Incited somebody to action
Voltage event count information is in the non-voltage memory of control circuit 130.Overvoltage logging program includes that overvoltage is counted and increases
Amount, stores increased count value.Additionally, overvoltage logging program determines the time that timing module is indicated, and record overvoltage thing
Part clocking value.The time of record can be a section of a period of time started from time last time, self clock cycle or interval beginning
Time, or time of one day.Or, control circuit 130 can send display control signal to display 150, to show increasing
Plus overvoltage count value.Additionally, by SCI modules, control circuit 130 can send to external equipment and contain overvoltage event
Information（For example, count value and clocking information）Information.
In the record overvoltage condition 330 shown in Fig. 3, although have recorded an overvoltage event, control circuit 130 is held
Continuous controlling switch circuit 140 maintains closure（Conducting state）, load equipment keeps and the connection of alternating current power supply.It is this according to confession
Piezoelectric voltage signal VlnConducting on off state as Fig. 2 lower right shown in, as supply voltage signal VlnA kind of function.By
Level is rebuild in supply voltage beyond overvoltage（OVrs）, then do not take any action, remain closed on-off circuit 140（Even
Connect）.If supply voltage signal is persistently raised, overvoltage record threshold value is exceeded（OVrc）, then then perform overvoltage record journey
Sequence（For example, incremental count, record time, control shows, provides outside notice）；However, being supplied to opening for on-off circuit 140
Close control signal and still remain in opening（Conducting）State（For example, switch controlling signal continues closure switch circuit 140）.
Running voltage may record threshold value around overvoltage in the short period of time（OVrc）Fluctuate up and down.As shown in Figure 3
Graphical state, in order to prevent a series of overvoltage reports, supply voltage signal must drop back to overvoltage and rebuild below threshold value
（Vln < OVrs）, so as to exceed overvoltage record threshold value to supply voltage signal（Vln>OVrc）React and perform another
Before individual overvoltage record operation, watch-dog 100 is set to return to normal operating conditions 320.In other words, once at watch-dog 100
In record overvoltage condition 330, overvoltage condition will not be re-recorded, until watch-dog 100 turns first to normal operating conditions
320, then it is switched again to record overvoltage condition 330, or watch-dog 100 is transformed into off state as described below
340.For according to alternatively possible application, once in record overvoltage condition 330, you can periodically estimate supply voltage
Signal VlnIf supply voltage signal is still located at overvoltage record threshold value（OVrc）More than, then can perform another overvoltage
Program, so as to obtain regular reporting.
If as shown in figure 3, supply voltage signal rises above overvoltage from record overvoltage condition 330 disconnects threshold
Value（Vln > OVsh）, watch-dog 100 can switch to off state 340.In this case, except performing overvoltage record again
Program, control circuit 130 can also perform " dwelling period " program, make switch controlling signal be changed into closed mode, make on-off circuit
140 are transformed into non-conduction or "Off" state（Disconnect）, so as to the connection of off device accessory power outlet and power supply sets to protect
It is standby.For example, for an electromagnetic relay switch, control circuit 130 will signal on-off circuit 140 remove after
Electric apparatus coil voltage, opens normally opened relay connector, so as to disconnect alternating current power supply with downstream components and the company of relevant device
Connect.In the operation that the rightmost side represents in Fig. 2 on off state figures, on-off circuit 140 is from conducting/closure（Equipment connection）Shape
State is transitioned into non-conduction/opening（Equipment is not connected to）State.
According to a kind of feasible option, supply voltage signal can be respectively recorded more than overvoltage cutout threshold（Vln >
OVsh）Situation, record threshold value and non-excessive voltage cutout threshold only above overvoltage with supply voltage signal（OVrc < Vln OVsh）Situation, for example, two different overvoltage can be kept to count, one be used for record exceed only it is relatively low excessively electric
Pressure record threshold value, another is used for record and exceedes higher overvoltage cutout threshold.
As shown in Fig. 2 once watch-dog 100 is in off state 340（After performing dwelling period program）, either power
Voltage signal VlnThreshold level OV is disconnected less than overvoltageshOr supply voltage signal VlnThreshold value water is recorded less than overvoltage
Flat OVrc, on-off circuit 140 all keep it is non-conduction/open（Cut off the electricity supply）State.In order to transit back into normal operating conditions
320, supply voltage signal VlnOvervoltage and electricity must be dropped to before control circuit 130 performs power cycles program again
The certain point that pressure is not enough between reconstruction threshold value（UVrs Vln OVrs）, it is changed into on-state in this switch controlling signal, from
And controlling switch circuit 140 is closed and turned on, to transmit electric power to shielded equipment.For example, opened using electromagnetic relay
Guan Shi, control circuit 130 will signal on-off circuit 140 for relay energy supply, make normally opened joint-closure, so as to
Plant component downstream and connection device transmission alternating current power supply, to connect equipment.As supply voltage signal VlnIt is excessively electric more than higher
Pressure cutout threshold OVshWhen, on-off circuit 140 is closed, but will not reset into open mode, until supply voltage signal VlnDrop
It is low to rebuild threshold value OV to relatively low overvoltagersHereinafter, there are hysteresis in on-off control mechanism, it is therefore prevented that due to supply voltage
The high-speed switch periodic phenomena that fluctuation is caused.
The operation of control circuit 130 is summarized according to overvoltage threshold, as supply voltage signal VlnLess than first（Rebuild）
Overvoltage threshold, when on-off circuit 140 is in nonconducting state, the controlling switch circuit 140 of control circuit 130 is converted to leads
Logical state.As supply voltage signal VlnMore than second（Record）During overvoltage threshold, the threshold value is higher than first overvoltage threshold
Value, and on-off circuit 140 it is in the conduction state when, the record overvoltage event of control circuit 130, and controlling switch circuit 140
It is kept on.As supply voltage signal VlnMore than the 3rd（Open circuit）Overvoltage threshold, the threshold value is higher than second
Overvoltage threshold, when on-off circuit 140 is in the conduction state, the controlling switch circuit 140 of control circuit 130 is transformed into non-leading
Logical state, and selectively it is recorded as into another overvoltage event.
Equally, if from normal operating conditions 320, the supply voltage signal V of periodic monitoringlnFall below voltage
Deficiency record threshold value UVrc（Vln < UVrc）When, control circuit 130 is by being transitioned into recording voltage deficiency cond 350
And make a response, perform undertension logging program.Undertension event count is stored in the non-volatile of control circuit 130
In memorizer.Undertension logging program includes that increasing undertension counts, and stores increased count value.Additionally, undertension
Logging program determines instruction time by timing module logging program, and the value is denoted as into the timing of undertension event.With it is excessively electric
Pressure event is the same, and the undertension event time of record can be or self clock cycle since a period of time of a upper event
Or interval start after a period of time, or time of one day.Control circuit 130 selectively sends aobvious to display 150
Show control signal, to show the undertension count value of increase.Additionally, by SCI modules, control circuit 130 can be to outside
Equipment sends the event information containing undertension（For example, count value and clocking information）.
In the recording voltage deficiency state 330 shown in Fig. 3, although have recorded a undertension event, on-off circuit
140 are also held on/close, and load equipment keeps the connection with alternating current power supply.This switch shape as supply voltage signal
State, it is seen that in the lower left of Fig. 2.Threshold value is rebuild when supply voltage signal drops to undertension（UVrs）Hereinafter, do not take any
Action, on-off circuit 140 is remained closed（Connection）.If supply voltage signal continuous decrease, fall to undertension record threshold value
（UVrc）Hereinafter, undertension logging program is performed（For example, incremental count, record time, control shows, provides outside notice）；
But, there is provided the switch controlling signal to on-off circuit 140 maintains opening（Conducting）State（For example, switch controlling signal is held
Continuous closing switch circuit 140）.
Supply voltage signal may record threshold value around undertension within a short period of time（UVrc）Fluctuate up and down.Such as Fig. 3
Shown graphical state, in order to prevent the not enough report of series of voltage, supply voltage signal must be over undertension weight
Build threshold value（Vln > UVrs）, so as to drop to below undertension record threshold value to supply voltage signal（Vln < UVrc）Make
Go out reaction and perform before another undertension record operation, make watch-dog 100 return to normal operating conditions 320.Change sentence
Talk about, once watch-dog 100 is in recording voltage deficiency state 350, will no longer recording voltage it is not enough, until watch-dog 100 it is first
Normal operating conditions 320 is briefly returned to, recording voltage deficiency state 350 is then transitioned into again, or watch-dog 100 is transformed into
Recording voltage deficiency state 350 can be just returned to during off state 340.For according to alternatively possible application, once place
In recording voltage deficiency state 350, you can periodically estimate supply voltage signal VlnIf supply voltage signal is still located at voltage
Deficiency record threshold value（UVrc）Hereinafter, then another undertension logging program is can perform, so as to obtain regular reporting.
If as shown in figure 3, supply voltage signal is reduced to undertension open circuit from recording voltage deficiency voltage status 350
Threshold value（Vln < UVsh）Hereinafter, watch-dog 100 can switch to off state 340.In this case, except performing voltage again
Not enough logging program, control circuit 130 can also perform dwelling period program, make switch controlling signal be changed into closed mode, make out
Powered-down road 140 is transformed into non-conduction or "Off" state（Disconnect switch）, so as to the connection of off device accessory power outlet and power supply,
Carry out protection equipment.In the operation that the leftmost side represents in Fig. 2 on off state figures, on-off circuit 140 is from conducting/closure（Equipment connects
Connect）Status transition is to non-conduction/disconnection（Equipment is not connected to）State.
According to a kind of feasible option, supply voltage signal can be respectively recorded less than undertension cutout threshold（Vln <
UVsh）Situation and supply voltage signal be only only below undertension record threshold value, rather than undertension cutout threshold（UVsh <
Vln UVrc）Situation, for example, two different undertensions can be kept to count, one is used for record and is less than high voltage
Deficiency record threshold value, another is used for record and is less than relatively low undertension cutout threshold.
As shown in Fig. 2 upper left quarters, once watch-dog 100 is in off state 340（After performing dwelling period program）No matter,
It is supply voltage signal VlnBeyond undertension cutout threshold UVshOr supply voltage signal VlnThreshold is recorded more than undertension
Value UVrc, on-off circuit 140 all keep it is non-conduction/disconnect（Cut off the electricity supply）State.In order to be transitioned into normal operating conditions 320,
Supply voltage signal VlnUndertension and excessively electric must be increased to before control circuit 130 performs power cycles program again
The certain point that ballast is built between threshold value（UVrs Vln OVrs）, it is changed into on-state in this switch controlling signal, so as to control
On-off circuit 140 is converted into a kind of conducting state（Closure）, to transmit electric power to shielded equipment.Due to supply voltage signal
VlnIt is reduced to undertension cutout threshold UVshHereinafter, on-off circuit 140 is closed but will not restored, until supply voltage signal
VlnThreshold value UV is rebuild more than undertensionrs, there are hysteresis in on-off control mechanism, it is therefore prevented that due to mains ripple
The high-speed switch periodic phenomena for causing.
The operation of the general introduction control circuit 130 related to undertension threshold value, as supply voltage signal VlnHigher than first
It is individual（Rebuild）Undertension threshold value, on-off circuit 140 is in for nonconducting state, the controlling switch circuit of control circuit 130
140 are converted to conducting state.As supply voltage signal VlnLess than second（Record）During undertension threshold value, the threshold value is less than
First undertension threshold value, and on-off circuit 140 it is in the conduction state when, the recording voltage of control circuit 130 deficiency event,
Controlling switch circuit 140 is kept on.As supply voltage signal VlnLess than the 3rd（Open circuit）Undertension threshold value,
When the threshold value is in the conduction state less than second undertension threshold value, and on-off circuit 140, the control of control circuit 130 is opened
Powered-down road 140 is transformed into nonconducting state, and selectively it is recorded as into another undertension event.
Fig. 4 A and Fig. 4 B are One function flow charts, and outline is carried out according to supply voltage condition to supply voltage watch-dog
One example logic of operation.Operation 405 in, from the beginning of entry condition, control circuit 130 pairs receive for representing
The V of voltage between the live wire and zero line of supply sidelnCarry out A/D analog digital conversion.Digitized power supply electricity is determined in act 410
Pressure signal VlnWhether rebuild between threshold value between undertension and overvoltage（UVrs Vln OVrs）.If it is, i.e.
Perform power cycles program（Operation 415）, i.e. control circuit 130 is to one " opening " state of offer of on-off circuit 140
Switch controlling signal is opening on-off circuit 140（Conducting state）So that input supply side live wire wire and output loading side fire
Line wire connects, so as to downstream equipment accessory power outlet transmits electric power to connect load equipment and alternating current power supply（For example, normally
Under working condition）.If not so（For example, if supply voltage signal VlnOutside reconstruction threshold level（Vln > OVrs
Or Vln < UVrs）, logic returns to operation 405, before performing power cycles program and returning to normal operating conditions, control
Circuit processed 130 continues to detect supply voltage signal Vln, until it is located in acceptable level（For example, UVrs Vln
OVrs）.
After performing power cycles program, to the supply voltage signal V for receivinglnThe A/D moduluses that carry out of durations turn
Change（Operation 420）.In operation 425, compare supply voltage signal and undertension cutout threshold UVsh.If supply voltage is believed
Number be less than undertension cutout threshold（Vln < UVsh）, then perform undertension logging program（Operation 430）And dwelling period
Program（Operation 435）, record above-mentioned undertension situation, closing switch circuit 140（Nonconducting state）To disconnect input（For
Electric side）Live wire wire and output（Load-side）The connection of live wire wire, so as to prevent electric energy to be transmitted downstream to equipment accessory power outlet,
The connection of disconnecting consumers equipment and alternating current power supply.After performing dwelling period program, logic returns to initial operation 405, fixed
Phase compares supply voltage signal VlnWith reconstruction threshold value.
If in operation 425, supply voltage signal is not below undertension cutout threshold（Vln UVsh）, then patrol
Collect circuit and enter operation 440, compare supply voltage and record threshold value UV with undertensionrc.If supply voltage signal is less than electricity
Record threshold value that pressure is not enough（Vln < UVrc）, then undertension logging program can be performed（Operation 445）, record above-mentioned voltage not
Sufficient state, logic enters operation 450（Fig. 4 B）.If supply voltage signal records threshold value not less than undertension（Vln
UVrc）, then the logic will be directed into operation 450, without the need for performing undertension logging program.
In operation 450, compare supply voltage signal and overvoltage cutout threshold OVsh.If supply voltage signal is more than
Overvoltage cutout threshold（Vln > OVsh）, then overvoltage logging program will be performed（Operation 455）With dwelling period program
（Operation 435）, record above-mentioned overvoltage condition, closing switch circuit 140（Nonconducting state）, disconnect input supply side live wire
The connection of wire and output loading side live wire wire, so as to prevent electric energy to be delivered to upstream device accessory power outlet, disconnecting consumers set
The standby connection with alternating current power supply.After performing dwelling period program, logic route returns to initial operation 405, regularly compares confession
Piezoelectric voltage signal VlnWith reconstruction threshold value.
In operation 450, if supply voltage signal is not more than overvoltage cutout threshold（Vln OVsh）, logic
Operation 460 is carried out, compares supply voltage and overvoltage record threshold value OVrc.If supply voltage signal records threshold more than overvoltage
Value（Vln > OVrc）, then overvoltage logging program（Operation 465）Will overvoltage condition recorded as described above, logic
Into operation 420, repeat to maintain on-off circuit closure（Connection）The compares cycle of state.If supply voltage signal was not more than
Voltage records threshold value（Vln OVrc）, logic is directly entered operation 415, without the need for performing overvoltage logging program.
Fig. 5 describes the function flow of another example that supply voltage monitor operations are performed according to supply voltage state
Cheng Tu.In operation 505, from initial state, to the V for representing voltage between live wire and zero line for receivinglnCarry out A/D moduluses
Conversion.Supply voltage signal V is determined in operation 510lnWhether it is located at undertension and overvoltage is rebuild between threshold value（UVrs
Vln OVrs）.If it is, performing power cycles program（Operation 515）In, control circuit 130 is to on-off circuit
140 provide switch controlling signal, in " opening " state opens switch circuit 140（Conducting state）, connection input supply supply side
Live wire wire and output loading side live wire wire, so as to downstream equipment accessory power outlet provides electric energy, connection load equipment and friendship
Stream power supply（For example, normal operating conditions）.If not so（For example, if supply voltage signal VlnPositioned at reconstruction threshold value water
It is flat outer（Vln > OVrs or Vln < UVrs）, logic can return to operation 505, perform power cycles program, and transition
To before normal operating conditions, control circuit 130 continues to detect supply voltage signal Vln, until the signal is located at acceptable water
It is flat（For example, UVrs Vln OVrs）.
After performing power cycles program, to the supply voltage signal V for receivinglnThe execution A/D moduluses of durations turn
Change（Operation 520）.In operation 525, comparison voltage is for giving undertension record threshold value UVrc.If supply voltage signal is little
Threshold value is recorded in undertension（Vln < UVrc）, then undertension logging program can be performed（Operation 530）, record above-mentioned electricity
State that pressure is not enough, and logic route enters operation 535, compares supply voltage signal and undertension cutout threshold UVsh.Such as
Fruit supply voltage signal is less than undertension cutout threshold（Vln < UVsh）, that is, perform dwelling period program（Operation 540）, note
Record above-mentioned undertension state, closing switch circuit 140（Nonconducting state）, input supply side live wire wire is disconnected with output
The connection of load-side live wire wire, so as to prevent electric energy from being transmitted downstream to equipment accessory power outlet, disconnecting consumers equipment and alternating current
Source.If control circuit 130 falls below undertension cutout threshold, control circuit from less than undertension record threshold value
130 can also perform undertension logging program（Do not show in Fig. 5）With dwelling period program.After performing dwelling period program, patrol
Collect circuit and return to initial operation 505, periodically compare supply voltage signal VlnWith reconstruction threshold value.
In operation 535, if supply voltage signal is not higher than undertension cutout threshold（Vln UVsh）, then patrol
Collect route and return to operation 520, supply voltage signal and various threshold values are compared in repetition, and on-off circuit is then maintained at closure（Conducting）
State.
In operation 525, if supply voltage signal records threshold value not less than undertension（Vln UVrc）, then patrol
Collect route and enter operation 545, compare supply voltage signal and record threshold value OV with overvoltagerc.If supply voltage signal was more than
Voltage records threshold value（Vln > OVrc）, then perform overvoltage logging program（Operation 550）, above-mentioned overvoltage condition is recorded,
And logic route enters operation 555, compare supply voltage signal and overvoltage cutout threshold OVsh.If supply voltage signal is big
In overvoltage cutout threshold（Vln > OVsh）, then perform dwelling period program（Operation 540）, record above-mentioned overvoltage shape
State, closing switch circuit 140（Nonconducting state）, input supply side live wire wire is disconnected with output loading side live wire wire
Connection, so as to prevent electric energy from being sent to the connection of upstream device accessory power outlet, disconnecting consumers equipment and alternating current power supply.If control
Circuit 130 records threshold value to higher than overvoltage cutout threshold from higher than overvoltage, then control circuit 130 can also perform electricity
Pressure logging program（Do not show in Fig. 5）With dwelling period program.After performing dwelling period program, logic route returns to initial behaviour
Make 505, periodically to compare supply voltage signal VlnWith reconstruction threshold value.
In operation 555, if supply voltage signal is not more than overvoltage cutout threshold（Vln OVsh）, then logic
Route can return to operation 520, and supply voltage signal and various threshold values are compared in repetition, and on-off circuit is then maintained at closure（Lead
It is logical）State.
In operation 545, if supply voltage signal is not more than overvoltage record threshold value（Vln OVrc）, then logic
Route can return to operation 520, and supply voltage signal and various threshold values are compared in repetition, and on-off circuit is then maintained at closure（Lead
It is logical）State.Any one specific embodiment described by Fig. 4 A, Fig. 4 B and Fig. 5 is the invention is not limited in, can be adopted various
Different operations is realizing the present invention.
With various different records and breaking level, can allow for recording the overvoltage and voltage that can destroy connection equipment
It is not enough（For example, the history of overvoltage and undertension event is created）, and without the need for really cut-out and the power supply for being connected equipment（Example
Such as, the equipment for closing connection）.The supply voltage level of connection equipment may be damaged（For example, beyond cutout threshold）, can
Tackled with disconnection and protection connection equipment by recording events.
As shown in figure 1, the serial communication interface installed on plate（SCI）Module allows control circuit 130 to external equipment
（For example, a computer, a microcontroller, a storage device, etc.）The state and event history of transmission watch-dog 100
（For example, overvoltage and undertension are counted）Etc. information, for information Store and analysis.Except setting to outside from watch-dog 100
Standby transmission data, SCI modules are also allowed from external equipment to data such as the control parameters of filter apparatus transmission equipment.For example, it is right
For a kind of selection, external equipment can provide overvoltage or undertension threshold value to control circuit 130, cover or replace first
Front storage value default value.
In a kind of specific embodiment, for example, watch-dog 100 can be with one program of an operation（For example, quick
Basic or C LISP program LISPs）Computer connection, in other respects, it is allowed to which terminal use is from string overvoltage and undertension
Selected in threshold level.The threshold value that these users select can be transferred to control circuit 130.Control circuit 130 is used with terminal
Threshold value use before the threshold value replacement of family selection or rewriting or acquiescence.Because watch-dog 100 is to protect various sensitivities to set
Standby and design, this feature allows the self-defined record and cutout threshold for being suitable for connection equipment of terminal use.
According to another characteristic, control circuit 130 is programmable to configuration processor to respond interruption.It is embodied as at one
In example, control circuit 130 is configured, using the timing module loaded on plate, start timer interrupt, " time increases for execution per second
Amount " program.In this case, control circuit 130 performs the operation in Fig. 4 A-4B or Fig. 5 shown in flow chart, interruption per second
To perform " incremental time " program, persistently to record from nearest recording events（Overvoltage, undertension, power failure or surge
Event）The run time for rising（Second, minute, hour and day）.Therefore, in response to above-mentioned electric source disturbance, except increasing and storing
Application affairs are counted, and control circuit 130 also stores the elapsed time from preceding events（For example, between event when
Between）.
Connect the calculating of control circuit 130 and an operation customization diagnostic software by using serial communication interface
Machine, can analyze, shows and store event data（Elapsed-time standards between event count and event）.During by using window
Between, and the time between recent events and the connection with computer are recorded, customization diagnostic software can be to precedence record
Event performs computations, and the time between the event for being recorded is converted into the actual time/date of event generation（Time marks
Note）.
Will recognize that above-mentioned control circuit 130 simply represents a kind of possible implementation, also other are much used
The method of multiple hardwares, software, firmware and combinations thereof, it is also possible to for assessing and overvoltage and undertension are responded.
Fig. 6 illustrates a complete electric source filter circuit 600, it include supply voltage watch-dog 100 shown in Fig. 1 and its
The component of his electric source filter circuit connection.Electric source filter circuit 600 can be connection, based on microcontroller
Compound filter（Surgesuppressor, EMI Electromagnetic interference filter）To suppress alternating current power supply transition and EMI electromagnetic interference, so as to
The equipment of connection is protected from the damage and destruction related to transient changing/noise.One diverter 610 is connected to input
Live wire, zero line and ground wire, the live wire of input and the wire of zero line are connected with latter wave filter 620（For example, supply voltage prison
The upstream of control component）.These steps suppress voltage transient and EMI/RFI electromagnetism/Radio frequency interference.Live wire, zero line with outfan
The holder 630 connected with the wire of ground wire（clamp stage）, positioned at the downstream of on-off circuit 140, for after filtering
Electric energy be delivered to before the equipment of connection eliminate it is any remnants voltage transient.Or, the control of the state of controlling switch circuit 140
Circuit processed can also control the state of a relay to be coordinated to protect to be connected and disconnected from holder 630 with the connection of zero line wire
The component of shield holder 630.Diverter 610, wave filter 620 and holder 630 are similar to Application No. in U.S. Patent application
Part described by 5,136,455, it is as an example, its disclosure of that is all incorporated herein by reference.
In this set, except monitoring overvoltage and undertension, control circuit 130 can also monitor other types
Running voltage interference or falsehood.For example, control circuit 130 can also assess whether there is line fault, and e.g. ground wire breaks
Open（open ground）Or the state of the pole reversal（For example, live wire and zero line are reverse）.Additionally, control circuit 130 can also be supervised
Survey overtemperature state and supercurrent state.In the event of power disturbance, control circuit can also increase corresponding power disturbance and count,
And store the counting in memory.
It is selectively that control circuit 130 can on the display 150 show the information about power disturbance（For example, line
Road fault type, etc.）.Interior in due course, control circuit 130 can also signal on-off circuit 140 and disconnect and equipment
Accessory power outlet it is electrically connected, carry out protection equipment.Used as response, on-off circuit 140 is needed according to whether detecting one kind and not meeting
The mode of operation wanted（For example, overvoltage condition, undertension, line fault, overtemperature, supercurrent state, etc.）Connection disconnects
Connection between live wire wire and the connection equipment of load-side.
Described above is the preferred embodiments of the supply voltage watch-dog of new improvement, it is envisaged that obtain the skill in the field
Art personnel can expect other modifications, change on the basis of described above or change.Therefore, what these were contemplated that is all
Change is belonged in the range of concrete right requirement appended by the present invention.All it is with more although being used herein specific term
For the purpose of describing well, it is not intended to be limited.
Claims (18)
1. a kind of supply voltage watch-dog, for monitoring the over-voltage condition of alternating current power supply, it is characterised in that include：
One on-off circuit, for connecting the input lead that can be connected with alternating current power supply and the output lead that can be connected with load,
When the on-off circuit is controlled in the conduction state, make the input lead electrical with output lead by the on-off circuit
Connection, and the on-off circuit be controlled in nonconducting state when, by the on-off circuit disconnect described input lead with
Electric connection between output lead；
One power supply signal adjusts circuit, for producing the supply voltage signal for representing AC supply voltage；
One control circuit, for monitoring supply voltage signal, and：
When the supply voltage signal is in nonconducting state less than first overvoltage threshold, and the on-off circuit, should
It is in the conduction state that control circuit is used for controlling switch circuit；
When the supply voltage signal more than one higher than second overvoltage threshold of first overvoltage threshold, and described open
When powered-down road is in the conduction state, the control circuit is used for record one and represents the sign that there occurs an overvoltage event,
And controlling switch circuit is kept on；
When the supply voltage signal more than one higher than the 3rd overvoltage threshold of second overvoltage threshold, and described open
When powered-down road is in the conduction state, the control circuit is in nonconducting state for controlling switch circuit.
2. supply voltage watch-dog as claimed in claim 1, it is characterised in that when the supply voltage signal is more than the 3rd mistake
Voltage threshold, and on-off circuit it is in the conduction state when, the control circuit is set as further recording one and represents to be sent out
The sign of another overvoltage event is given birth to.
3. supply voltage watch-dog as claimed in claim 2, it is characterised in that the control circuit is by increasing overvoltage event
Count record represent there occurs an overvoltage event or the sign of another overvoltage event.
4. supply voltage watch-dog as claimed in claim 1, it is characterised in that：
The control circuit is further configured to：
When supply voltage signal is in nonconducting state more than first undertension threshold value, and the on-off circuit,
The control circuit can controlling switch circuit in the conduction state；
When supply voltage signal less than one less than second undertension threshold value of first undertension threshold value, and described open
When powered-down road is in the conduction state, the control circuit is able to record that represents the mark that there occurs a undertension event
Show, and control the on-off circuit and be kept on；
When supply voltage signal less than one less than the 3rd undertension threshold value of second undertension threshold value, and described open
When powered-down road is in the conduction state, it is in nonconducting state that the control circuit can control the on-off circuit.
5. supply voltage watch-dog as claimed in claim 4, it is characterised in that when the supply voltage signal is less than the 3rd electricity
Threshold value that pressure is not enough, and on-off circuit it is in the conduction state when, the control circuit is set as further recording an expression
There occurs the sign of another undertension event.
6. supply voltage watch-dog as claimed in claim 5, it is characterised in that the control circuit is by increasing undertension thing
Part count record represent there occurs a undertension event or the sign of another undertension event.
7. supply voltage watch-dog as claimed in claim 3, it is characterised in that the control circuit is further configured to can
Record represents an overvoltage event or the sign of another overvoltage event time of origin.
8. supply voltage watch-dog as claimed in claim 6, it is characterised in that the control circuit is further configured to can
Record represents a undertension event or the sign of another undertension Time To Event.
9. supply voltage watch-dog as claimed in claim 1, it is characterised in that the control circuit is further configured to sending out
A raw supply voltage signal first has any supply voltage signal before the situation less than first overvoltage threshold
More than second overvoltage threshold situation when, the control circuit can there occurs that the sign of overvoltage event is only recorded to expression
Once.
10. supply voltage watch-dog as claimed in claim 4, it is characterised in that the control circuit is further configured to
There is a supply voltage signal more than first there occurs any supply voltage before the situation of first undertension threshold value
Signal less than second undertension threshold value situation when, the control circuit can there occurs the mark of undertension event to expression
Show that only record is once.
11. supply voltage watch-dogs as claimed in claim 3, it is characterised in that the control circuit is further configured to
Supply voltage signal is counted more than increasing overvoltage event during second overvoltage threshold, and in supply voltage signal more than the
Increase another overvoltage event during three overvoltage thresholds to count.
12. supply voltage watch-dogs as claimed in claim 6, it is characterised in that the control circuit is further configured to
Supply voltage signal increases undertension event count when being less than second undertension threshold value, and low in supply voltage signal
Increase another undertension event count when the 3rd undertension threshold value.
A kind of 13. methods of the overvoltage condition powered for alternating current power supply of the monitoring with supply voltage watch-dog, its feature
It is to be included in supply voltage watch-dog one on-off circuit of setting to lead with the input of alternating current power supply connection to connect
Line and the output lead that can be connected with load, when the on-off circuit is controlled in the conduction state, by the on-off circuit
The input lead is set to be electrically connected with the output lead, and the on-off circuit is controlled under nonconducting state,
Electric connection between the output lead and the input lead is disconnected by the on-off circuit, and methods described includes：
Generation represents the supply voltage signal of AC supply voltage；
When supply voltage signal is in nonconducting state less than first overvoltage threshold, and the on-off circuit, control
It is in the conduction state to make the on-off circuit；
When supply voltage signal more than one higher than second overvoltage threshold of first overvoltage threshold, and the switch is electric
When road is in the conduction state, records an expression and there occurs the sign of an overvoltage event, and control the on-off circuit dimension
Hold in conducting state；
At three overvoltage threshold, and on-off circuit of the supply voltage signal more than one higher than second overvoltage threshold
When conducting state, it is in nonconducting state to control the on-off circuit.
14. methods as claimed in claim 13, it is characterised in that also include：
When the supply voltage signal is in the conduction state more than the 3rd overvoltage threshold, and on-off circuit, one is recorded
Expression there occurs the sign of another overvoltage event.
15. methods as claimed in claim 14, it is characterised in that record expression there occurs an overvoltage event or another mistake
During the sign of voltage event, including incremental overvoltage event count, and record one represent an overvoltage event or another
The sign of overvoltage event time of origin.
16. methods as claimed in claim 13, it is characterised in that also include：
When supply voltage signal is in nonconducting state more than first undertension threshold value, and on-off circuit, control
The on-off circuit is in the conduction state；
When supply voltage signal less than one less than second undertension threshold value of first undertension threshold value, and switch electricity
When road is in the conduction state, one expression of record there occurs the sign of a undertension event, and control the on-off circuit
Maintain conducting state；
When supply voltage signal less than one less than the 3rd undertension threshold value of second undertension threshold value, and switch electricity
When road is in the conduction state, it is in nonconducting state to control the on-off circuit.
17. methods as claimed in claim 16, it is characterised in that also include：
When the supply voltage signal is in the conduction state less than the 3rd undertension threshold value, and on-off circuit, record one
The individual sign that there occurs another undertension event.
18. methods as claimed in claim 17, it is characterised in that record expression there occurs a undertension event or another
During the sign of undertension event, including incremental voltage deficiency event count, and record one expression, one undertension event
Or the sign of another undertension Time To Event.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/198,137 US8520349B2 (en) | 2011-01-31 | 2011-08-04 | Supply voltage monitor |
| US13/198,137 | 2011-08-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102916388A CN102916388A (en) | 2013-02-06 |
| CN102916388B true CN102916388B (en) | 2017-04-12 |
Family
ID=47614670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210257235.XA Active CN102916388B (en) | 2011-08-04 | 2012-07-24 | Supply voltage monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102916388B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10602082B2 (en) * | 2014-09-17 | 2020-03-24 | Fluke Corporation | Triggered operation and/or recording of test and measurement or imaging tools |
| CN105140926A (en) * | 2015-10-21 | 2015-12-09 | 珠海格力电器股份有限公司 | Electrical equipment power supply control method and control system thereof |
| FR3067118B1 (en) * | 2017-05-31 | 2021-07-02 | Sagemcom Energy & Telecom Sas | SINGLE-PHASE ELECTRIC METER |
| CN117674447B (en) * | 2023-12-07 | 2024-06-18 | 中冶建筑研究总院有限公司 | Passive load monitoring method and system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440441A (en) * | 1984-10-24 | 1995-08-08 | Ahuja; Om | Apparatus for protecting, monitoring, and managing an AC/DC electrical line or a telecommunication line using a microprocessor |
| US6118639A (en) * | 1997-05-30 | 2000-09-12 | Goldstein; Richard | Fast acting disconnect system for protecting surge suppressors and connected utilization equipment from power line overvoltages |
| US6947266B1 (en) * | 2002-02-21 | 2005-09-20 | Billingsley Richard J | Power protection device |
| CN101047319A (en) * | 2006-03-28 | 2007-10-03 | 富士通株式会社 | Uninterruptible power supply apparatus |
| CN101097481A (en) * | 2006-06-30 | 2008-01-02 | 佛山市顺德区顺达电脑厂有限公司 | Electronic device having electric power management mechanism |
| CN101765270A (en) * | 2009-09-14 | 2010-06-30 | 海洋王照明科技股份有限公司 | Lamp control circuit and lamp |
| CN201629719U (en) * | 2010-02-02 | 2010-11-10 | 北京科技大学 | Servo driving device for robot asynchronous motor |
| CN102132479A (en) * | 2008-08-29 | 2011-07-20 | 夏普株式会社 | Power supply device and lighting device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7957117B2 (en) * | 2007-04-05 | 2011-06-07 | Georgia Tech Research Corporation | Voltage surge and overvoltage protection |
| US8482885B2 (en) * | 2009-09-14 | 2013-07-09 | Electronic Systems Protection, Inc. | Hybrid switch circuit |
-
2012
- 2012-07-24 CN CN201210257235.XA patent/CN102916388B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440441A (en) * | 1984-10-24 | 1995-08-08 | Ahuja; Om | Apparatus for protecting, monitoring, and managing an AC/DC electrical line or a telecommunication line using a microprocessor |
| US6118639A (en) * | 1997-05-30 | 2000-09-12 | Goldstein; Richard | Fast acting disconnect system for protecting surge suppressors and connected utilization equipment from power line overvoltages |
| US6947266B1 (en) * | 2002-02-21 | 2005-09-20 | Billingsley Richard J | Power protection device |
| CN101047319A (en) * | 2006-03-28 | 2007-10-03 | 富士通株式会社 | Uninterruptible power supply apparatus |
| CN101097481A (en) * | 2006-06-30 | 2008-01-02 | 佛山市顺德区顺达电脑厂有限公司 | Electronic device having electric power management mechanism |
| CN102132479A (en) * | 2008-08-29 | 2011-07-20 | 夏普株式会社 | Power supply device and lighting device |
| CN101765270A (en) * | 2009-09-14 | 2010-06-30 | 海洋王照明科技股份有限公司 | Lamp control circuit and lamp |
| CN201629719U (en) * | 2010-02-02 | 2010-11-10 | 北京科技大学 | Servo driving device for robot asynchronous motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102916388A (en) | 2013-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8520349B2 (en) | Supply voltage monitor | |
| ES2686429T3 (en) | Power management and control device with remote access | |
| CN103155327B (en) | Use the electronic circuit breaker with alternate operating mode of accessory power supply | |
| CN102916388B (en) | Supply voltage monitor | |
| EP2369709B1 (en) | Switch-Fuse with control management for solar cells | |
| US9166396B2 (en) | Power conditioning, distribution and management | |
| CN111226366A (en) | Method and apparatus for adaptive AC/DC surge protection | |
| CN105981127A (en) | Relay with integral phase controlled switching | |
| US9299524B2 (en) | Line cord with a ride-through functionality for momentary disturbances | |
| CN103236680A (en) | Intelligent protection device and method for surge protector | |
| US11283275B2 (en) | Smart uninterruptible power supply and method | |
| KR20220106741A (en) | Power Contact Electrode Surface Plasma Therapy | |
| CN101764403B (en) | UUT protective circuit | |
| EP2808968A1 (en) | Power conditioning, distribution and management | |
| CN108808625A (en) | It is a kind of that system is protected based on the compressor electric motor of Redundancy Design and key position self-test | |
| EP3021441B1 (en) | Selective event reaction processing in power control | |
| CN209400679U (en) | Analog acquisition card | |
| CN208369199U (en) | It is a kind of that system is protected based on the compressor electric motor of Redundancy Design and key position self-test | |
| KR101200534B1 (en) | Apparatus and method for protecting from surge and overvoltage noise | |
| JP5499269B2 (en) | Surge counter | |
| CN105067872A (en) | Single-phase residual electricity quantity signal trigger and monitoring method | |
| RU147371U1 (en) | ELECTRICITY METER WITH ADAPTIVE AUTOMATIC CONTROL SYSTEM | |
| CN110824305A (en) | Lightning protection device state detection and collection device | |
| CN214755486U (en) | Fire control water supply control relay module | |
| CN114120593B (en) | Alarm method of fault alarm device for arrearage tripping of high-voltage pre-purchased ammeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |