CN102916388A - Supply voltage monitor - Google Patents

Supply voltage monitor Download PDF

Info

Publication number
CN102916388A
CN102916388A CN201210257235XA CN201210257235A CN102916388A CN 102916388 A CN102916388 A CN 102916388A CN 201210257235X A CN201210257235X A CN 201210257235XA CN 201210257235 A CN201210257235 A CN 201210257235A CN 102916388 A CN102916388 A CN 102916388A
Authority
CN
China
Prior art keywords
supply power
power voltage
threshold value
switching circuit
overvoltage
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.)
Granted
Application number
CN201210257235XA
Other languages
Chinese (zh)
Other versions
CN102916388B (en
Inventor
理查德·J·比林斯利
罗伯特·A·达利
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electronic Systems Protection Inc
Original Assignee
Electronic Systems Protection Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US13/198,137 external-priority patent/US8520349B2/en
Application filed by Electronic Systems Protection Inc filed Critical Electronic Systems Protection Inc
Publication of CN102916388A publication Critical patent/CN102916388A/en
Application granted granted Critical
Publication of CN102916388B publication Critical patent/CN102916388B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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

The supply power voltage watch-dog
Technical field
The present invention relates to the power protection field, particularly a kind of supply power voltage watch-dog.
Background technology
A lot of available power protective equipments, for example surge protector (SPD) and compound filter all have an automatic switching circuit, can be according to the AC power of different power supply wiring troubles and/or overvoltage or undertension condition disconnection power supply unit.Detect the circuit of overvoltage or undertension, need to before AC power is flowed through equipment output and jockey, reach rated line voltage.The linear voltage situation, for example voltage raises and overvoltage, can cause the fault of certain electrical protection apparatus parts (for example metal oxide piezo-resistance and other inhibitor elements).In addition, the power supply of some equipment has damage when the overvoltage that is continued.The connection device fault, for example short circuit is caused by undertension, and then causes occurring in electrical protection apparatus or the connection device itself potential, that harm is arranged or unsafe high-intensity currrent.
Although the advantage of power protective equipment is that according to failure condition for example overvoltage or undertension disconnect the power supply to equipment, consequent power breakdown can bring inconvenience or problem in many cases.For fear of power breakdown frequently occurring, one of them solution is that the voltage levvl when power supply is disconnected is arranged on outside the normal operation range, but still in the scope that equipment can bear.Yet the method may cause frequent occurrence or have for a long time the situation of overvoltage or undertension, and this situation has the very difficult less scale of being perceived, and this finally can cause the damage to surge protector or connection device.Therefore; still need a kind of supply power voltage supervisory control system; the protection of overvoltage and undertension can be provided in the situation that does not cause frequent power breakdown, sufficient announcement to small-scale overvoltage and undertension is provided simultaneously, show in the system or the problem relevant with connection device.
Summary of the invention
Described herein is a kind of supply power voltage watch-dog, is used for the over-voltage condition of monitoring AC power.
This watch-dog comprises a switching circuit, a power supply signal regulating circuit and a control circuit.The input lead that this switching circuit optionally can be communicated with AC power is connected to the output conductor that can be communicated with load.For example, switching circuit can be between the live wire wire of the input of watch-dog and output.When conducting state, switching circuit is electrically connected input lead and output lead, and when nonconducting state, switching circuit then disconnects the electric connection of input lead and output lead.The power supply signal regulating circuit produces a supply power voltage signal that represents AC supply voltage.For example, the live wire of supply power voltage signal and AC power and the voltage between the zero line are proportional.Supply power voltage signal during control circuit monitoring overvoltage is controlled this switching circuit and is recorded overvoltage event according to specific condition.
Especially, when switching circuit is positioned at nonconducting state, according to the supply power voltage signal between first " reconstruction " overvoltage threshold value and first " reconstruction " undertension threshold value, be conducting state by control circuit control switch circuit conversion.In case switching circuit is in conducting state, then when the supply power voltage signal was higher than second " record " overvoltage threshold value of rebuilding the overvoltage threshold value above one, control circuit can record overvoltage event and make switching circuit keep conducting state.In addition, when the supply power voltage signal was higher than the 3rd the "off" overvoltage threshold value that records the overvoltage threshold value above one, control circuit can be converted to nonconducting state from conducting state by the control switch circuit, and records another overvoltage event.Record an overvoltage event and comprise that increasing progressively overvoltage event counts and the overvoltage event timing.
Similarly, in case switching circuit is in conducting state, when the supply power voltage signal was lower than second " record " undertension threshold value less than the not enough threshold value of restore voltage, control circuit can the not enough event of recording voltage, and makes switching circuit maintenance conducting state.In addition, when the supply power voltage signal was lower than the 3rd " an opening circuit " undertension threshold value less than the not enough threshold value of recording voltage, control circuit can be converted to nonconducting state from conducting state by the control switch circuit, and records another undertension event.
In conjunction with to preferential embodiment with give a definition, description and accompanying drawing, aforesaid and other the characteristics and advantages of the present invention must further to define, wherein the reference number in each diagram is used to specify similar assembly.Although these descriptions are in order more specifically to describe details of the present invention, but still be understandable that those skilled in the art can expect on basis described herein a lot of other variants.
Description of drawings
Fig. 1 a kind ofly can selectivity connects an AC power to the block diagram of the specific embodiment of the supply power voltage watch-dog of load equipment.
Switching circuit state when Fig. 2 has illustrated supply power voltage watch-dog performance supply voltage level shown in Figure 1 with graph mode.
Fig. 3 has illustrated the mode of operation of supply power voltage watch-dog shown in Figure 1 in the state diagram mode.
Fig. 4 A and Fig. 4 B have described under the supply power voltage condition, the functional flow diagram of the logical instance that supply power voltage watch-dog shown in Figure 1 operates.
Fig. 5 has described under the supply power voltage condition, the functional flow diagram of another logical instance that supply power voltage watch-dog shown in Figure 1 operates.
Fig. 6 is the schematic diagram of specific embodiment that comprises a power filter circuit of supply power voltage watch-dog shown in Figure 1.
Embodiment
Supply power voltage watch-dog described in the invention utilizes a plurality of voltage threshold levels to monitor the AC supply voltage that is connected with load equipment, and can, in the situation that for example wherein has threshold value to be crossed, carry out different operating.For example, if the voltage of AC power surpasses the overvoltage threshold value of " record ", namely can be recorded and carry out in real time or examination after a while and assessment, determine whether to exist certain problem.If AC supply voltage above higher " opening circuit " overvoltage threshold value, then can be recorded and load equipment and AC power are disconnected protection load equipment and watch-dog itself.Similarly, if AC supply voltage is lower than the undertension threshold value of " record ", namely can be recorded, and if AC supply voltage be lower than lower "off" voltage threshold, namely can be recorded, and this equipment and AC power are disconnected.By this way, can protect load equipment and watch-dog to avoid the infringement of serious overvoltage and undertension, and can monitor the at once interruption that less overvoltage and undertension but can not cause power supply.If the low-voltage that continued presence is less and over-voltage condition can at the convenient time be corrected measurement so.
Fig. 1 a kind ofly can selectivity connects an AC power to the block diagram of the specific embodiment of the supply power voltage watch-dog 100 of load equipment.As will more describing in detail; supply power voltage watch-dog 100 can merge in multiple electric power protection and the conditioning equipment; for example in surge protector (SPD) and the compound filter, bring into play multiple other functions that can guarantee to carry to load equipment reliable energy supply.
As shown in Figure 1, in feeder ear one side, live wire, zero line and the ground wire of watch-dog 100 input terminals, (for example, terminals can be plugs that inserts AC Power supply socket) is set to be connected with the respective terminal of ac power supply system.In load one side, the live wire of outlet terminal, zero line and ground wire are set to be connected with the corresponding terminals of one or more load equipments.The live wire of equipment and the wire of zero line provide respectively the route between the terminals of the live wire that is input to output and zero line.
Switching circuit 140 distributes along the route of live wire wire, and selectively the live wire wire of the input (supply side) between the input and output hot terminal is connected with the live wire wire of output (load side).When conducting state, switching circuit 140 is electrically connected input live wire wire and output live wire wire, and when nonconducting state, switching circuit 140 electrically disconnects and inputs live wire wire and output live wire wire.Switching circuit 140 can adopt any device in the multiple switching device.For a kind of selection, switching circuit 140 can comprise an electromagnetic relay (EMR), wherein the voltage of relay coil is used for closing the relay contact of often opening, thereby closed/as to disconnect the circuit continuity between input and output live wire wire, and the output that optionally alternating current is flowed to watch-dog is connected equipment with connection.Select for another kind, switching circuit 140 can adopt a kind of power semiconductor, for example a kind of bilateral triode switch.
Also have another kind of the selection, switching circuit 140 can adopt a kind of hybrid switch circuit, the parallel combination that comprises a power semiconductor and an electromagnetic relay, be that disclosed object is as a reference in this application as described in 2011/0063759 the U.S. Patent application as application number.In this configuration, can realize having the operating passing zero switch of minimum on state voltage decline and power loss.Under correct design; the automatic switching circuit of controlling according to overvoltage or undertension can protect easily impaired upstream device assembly (for example, metal oxide piezo-resistance (MOV) and other inhibitor elements) to avoid the damage that overvoltage and undertension bring.Except protecting easily impaired apparatus assembly, these circuit also can protection can be subject to the connection device of overvoltage or undertension damage.
Switching circuit 140 as shown in Figure 1 is set to the connection between the live wire wire of closure/disconnection input and output, perhaps, switching circuit with the same manner control can be between the zero line wire of input and output, and perhaps switch can be arranged in the live wire of watch-dog 100 and the circuit of zero line simultaneously.
A power supply signal regulating circuit 110 is connected to input (supply side) live wire of watch-dog 100 and the wire of zero line, and forms a supply power voltage signal V from these ac supply signals Ln, this supply power voltage signal V LnExpression can be used in the live wire of the input that control circuit 130 processes and the voltage between the zero line.For example, control circuit 130 can be a microcontroller.This supply power voltage signal V LnFeature depend on the customized configuration that microcontroller adopts.For example, can accept a kind of ac voltage signal in order to make microcontroller, the supply power voltage signal V that power supply signal regulating circuit 110 produces Ln, can be as the version of voltage ladder decline between live wire and the zero line.For a kind of microcontroller for receiving d. c. voltage signal, the supply power voltage signal V that power supply signal regulating circuit 110 produces LnCan be as direct current signal (for example a kind of analog signal), make the value of this signal be positioned at the opereating specification of microcontroller, be directly proportional with voltage peak between power supply live wire and the zero line.For example, power supply signal regulating circuit 110 can be a simple voltage divider, and control circuit 130 may need a specific A/D analog-to-digital conversion input.If control circuit 130 have a kind of standard 0 to V DdThe A/D analog-to-digital conversion input of type, then power supply signal regulating circuit 110 can comprise a quasi-peak value detecting circuit.A kind of selection that specific embodiment described here uses is shown V with the voltmeter between power supply live wire and the zero line Ln, to detect overvoltage and undertension, select according to another kind, the voltmeter between power supply live wire and the ground wire can also be shown V Lg, realize this purpose.
Power circuit 120 is connected with the live wire of watch-dog 100 supply sides and the wire of zero line, and produces the required d. c. voltage signal of operation control circuit 130 and switching circuit 140.In example shown in Figure 1, the first DC power supply voltage V of generation DDProvide to control circuit 130, and the second DC power supply voltage V that produces SWThen provide to switching circuit 140.Although these direct voltages that power circuit 120 produces, come from the live wire of input to the AC signal of zero line, power circuit 120 still can be an adjustable DC power supply, its direct current output (for example, regulating its output) is maintained the nominal level of the variation that is in close proximity to AC-input voltage.For the variation with DC voltage and supply voltage is consistent, can adopt multiple adjusting form.For example, can use a kind of Zener diode adjuster, comprising the current-limiting resistor of connecting with one or more Zener diodes.The voltage at Zener diode two ends changes with the electric current progression that flows through this equipment slight variation.Other the regulative mode that makes VD can surpass the AC supply voltage scope can comprise pulse width modulation and feedback regulation method.
Control circuit 130 has a processor (for example, a microprocessor, a microcontroller, a digital signal processor etc.), can executive program order (for example, software) realize various operations and task.For example, calculating, storing information be annotated, be carried out to control circuit 130 can to the data and the order that receive, and switching circuit 140 and a display 150 of control watch-dog 100.Display 150 can be in the multiple display mechanism any (for example, LCD display, light-emitting diode display etc.), visual supply power voltage monitor message is provided, and can be mounted to for example outer cover or the housing part of watch-dog 100, thereby can in operating process, conveniently check.
Control circuit 130 also has memory property, can store the information of relevant overvoltage and undertension, event count information, clocking information and other data or information.Performed program command (for example, software) when the internal memory of control circuit 130 or memory also can be stored by the processor executable operations of control circuit 130.Therefore, operation described herein and method can realize by the instruction that execution is stored on the non-interim computer-readable medium (for example, software) on one or more processors of control circuit 130.Just as used herein, " computer-readable medium " refers to nonvolatile (tangible) medium (for example, memory or internal memory).The memory/storage of control circuit 130 is a kind of tangible processor memory devices readable or computer-readable, can store or use command code, when being carried out by the processor of control circuit 130, makes processor carry out function described herein.When the software of carrying out storage by a programmable microprocessor when control circuit 130 moves, a kind of selectable processing environment is a kind of fixed data treatment element, an Application-Specific Integrated Circuit (ASIC) for example, be configured the execution logic circuit function by fixing hardware logic.Another kind of possible data processing circumstance is a kind ofly to relate to one or more field programmable logic devices, or the fixedly combination for the treatment of element, firmware and/or programmable logic device.The memory of control circuit 130 also comprises a nonvolatile memory, and for example an EEPROM is used for storage event information, for example overvoltage and the number of times of undertension event and relevant clocking information.
The operating voltage V that control circuit 130 is produced by power circuit 120 DDPower supply, and by receiving the voltage V between live wire and the zero line Ln, assess whether have undertension or overvoltage condition.Control circuit 130 is according to the supply power voltage signal V that receives Ln, provide switch controlling signal to switching 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 overvoltage or undertension situation can be damaged the equipment of connection potentially, the microcontroller signal transmits switch controlling signal to switching circuit 140 so, disconnects the power supply to the equipment accessory power outlet, thus protection equipment.
In example shown in Figure 1, control circuit 130 also comprises a serial communication interface (SCI), allows data (for example, state and event history) to transfer to external equipment from control circuit 130, and 130 carry data (for example, control parameter) from external equipment to control circuit.
Control circuit also has a timing module, is used for writing time (for example, second, minute, hour and fate, etc.).For example, timing module can be kept the operation clock or provide one apart from the time that last time, event experienced, thus the reference time of record and storage overvoltage and undertension event.
According to an embodiment, supply power voltage signal V LnBe an analog DC signal, this analog DC signal is directly proportional with wire from the input live wire to zero line, and the firmware of control circuit 130 or software cycle ground are to supply power voltage signal V LnCarry out analog digital (A/D) conversion, convert thereof into digital signal, for example, with hexadecimal " Hex " value representation.Will with the threshold ratio of the direct proportional hexadecimal Hex value of supply power voltage and various storages (for example, being stored in the firmware): OV Restore(overvoltage reconstruction), OV Record(overvoltage record), OV Shutdown(overvoltage opens circuit), UV Restore(undertension reconstruction), UV Record(undertension record) and UV Shutdown(undertension opens circuit).Based on supply power voltage signal value V LnWith the comparison of the threshold value of these storages, control circuit 130 determines that operating voltages are acceptables, still has undertension (UV) or overvoltage (OV) situation.For instance, U.S.'s power supply, acquiescence " firmware " hexadecimal Hex value can adopt following supply voltage level:
OV shutdown （OV sh）　 150 Vrms
OV record （OV rc） 135 Vrms
OV restore （OV rs） 130 Vrms
UV restore （UV rs） 105 Vrms
UV record （UV rc） 100 Vrms
UV shutdown （UV sh）　 80 Vrm
According to these threshold values to the operation of control circuit 130 shown in the chart among Fig. 2, the switching circuit state when having described 100 operating voltage horizontal forces of supply power voltage watch-dog in conjunction with chart shown in Figure 3, has illustrated the mode of operation of supply power voltage watch-dog 100.In order to reach consistency, when mentioning supply power voltage signal V LnAnd during the comparison between the multiple threshold value, operator＜,,
Figure 201210257235X100002DEST_PATH_IMAGE001
With
Figure 739442DEST_PATH_IMAGE002
Be used to following description.Yet, be understandable that the present invention is not limited to the embodiment (for example, coming really whether to satisfy a threshold value by exceeding/do not reach this threshold value or only being equal to this threshold value) whether any detection reaches threshold value.So within the scope of the present invention, symbol＜with
Figure 347009DEST_PATH_IMAGE001
Be used interchangeably symbol〉with
Figure 757262DEST_PATH_IMAGE002
Be used interchangeably.
Reconstruction threshold level (the OV of overvoltage and undertension RsAnd UV Rs) represent respectively the upper and lower bound (for example, overvoltage or undertension state) of operating voltage " normally " scope.For example, an AC supply voltage that is positioned at 105 Vrms to 130 Vrms scopes can be thought enough rated operational voltage levels close to 120 Vrms, and this can think acceptable.
When starting (state 310 shown in Figure 3), if supply power voltage signal V LnBe acceptable (for example, between the reconstruction threshold value of overvoltage and undertension, UV RsAnd OV Rs), control circuit 130 is carried out " energising cycle " program so, transfers watch-dog 100 to normal operating conditions 320.In this case, control circuit 130 provides switch controlling signal at " energising " state to switching circuit 140, thereby open (closure) switching circuit 140, for example, be converted to conducting state, with the live wire wire of connection input power supply and the live wire wire of output loading, thereby with the equipment accessory power outlet of power delivery to the downstream, the realization load equipment is connected with AC power.Centre position, Fig. 2 below has indicated this switch state of a control, and its on off state is closed (connection/conducting), and supply power voltage signal V LnBe positioned at UV RsAnd OV RsBetween.
If, when starting, supply power voltage signal V LnBe positioned at and rebuild (for example, V outside the threshold level LnOV RsOr V Ln＜UV Rs), control circuit 130 consists of the loop so, before carrying out energising cycle program and changing normal operating conditions 320 into, and continuous detecting supply power voltage signal V Ln, until it is in (for example, UV in the acceptable level scope Rs
Figure 182296DEST_PATH_IMAGE001
V Ln
Figure 45210DEST_PATH_IMAGE001
OV Rs).
In normal operating conditions 320, control circuit 130 is kept the periodically supply power voltage signal V to receiving LnCarry out the A/D analog-to-digital conversion, determine whether acceptable operating voltage is, perhaps whether can develop into to a certain degree overvoltage or undertension.As shown in Figure 3, if supply power voltage signal V LnBe elevated to and surpass overvoltage record threshold value OV RcThe time, control circuit 130 is made a response by being converted into 330 pairs of these states of record overvoltage condition, carries out a kind of " overvoltage record " program.The overvoltage event counting is stored in the non-voltage memory of control circuit 130.The overvoltage logging program comprises the overvoltage counter incrementing, the count value that storage increases.In addition, the overvoltage logging program determines the time of timing module indication, and record overvoltage event clocking value.The time of record can be a period of time that began from time last time, a period of time that self clock cycle or interval begin, or one day time.Perhaps, control circuit 130 can send display control signal to display 150, to show the overvoltage count value that increases.In addition, by the SCI module, control circuit 130 can send the information that contains overvoltage event information (for example, count value and clocking information) to external equipment.
At record overvoltage condition 330 shown in Figure 3, although recorded an overvoltage event, control circuit 130 Sustainable Control switching circuits 140 are kept closure (conducting state), and the load equipment maintenance is connected with AC power.This according to supply power voltage signal V LnThe actuating switch state see shown in Fig. 2 lower right, as supply power voltage signal V LnA kind of function.Because supply power voltage exceeds overvoltage reconstruction level (OV Rs), then do not take any action, make switching circuit 140 remain closed (connection).If the supply power voltage signal continues to raise, surpassed overvoltage record threshold value (OV Rc), so then carry out overvoltage logging program (for example, increase progressively counting, writing time, control display, outside announcement is provided); Yet the switch controlling signal that offers switching circuit 140 still remains on (conducting) state of opening (for example, switch controlling signal continues Closing Switch circuit 140).
Operating voltage may be in the short period of time around overvoltage record threshold value (OV Rc) up and down fluctuation.Graphical state as shown in Figure 3, in order to prevent a series of overvoltage reports, the supply power voltage signal must fall back overvoltage and rebuild the following (V of threshold value Ln＜OV Rs), thereby the supply power voltage signal is being surpassed overvoltage record threshold value (V LnOV Rc) react and carry out before the operation of another overvoltage record, make watch-dog 100 get back to normal operating conditions 320.In other words, in case watch-dog 100 is in record overvoltage condition 330, will no longer record overvoltage condition, until watch-dog 100 is at first got back to normal operating conditions 320, and then be transformed into record overvoltage condition 330, or watch-dog 100 is transformed into off state as described below 340.The application possible according to another kind in case be in record overvoltage condition 330, can regularly be estimated supply power voltage signal V LnIf the supply power voltage signal still is positioned at overvoltage record threshold value (OV Rc) more than, then can carry out another overvoltage program, thereby obtain regular reporting.
As shown in Figure 3, if being elevated to from record overvoltage condition 330, the supply power voltage signal is higher than overvoltage disconnection threshold value (V LnOV Sh), watch-dog 100 can transfer off state 340 to.In this case; except again carrying out the overvoltage logging program; control circuit 130 also can be carried out " dwelling period " program; make switch controlling signal become closed condition; make switching circuit 140 be transformed into non-conduction or " closing " state (disconnection); thereby the off device accessory power outlet is connected with power supply, comes protection equipment.For example, for an electromagnetic relay switch, control circuit 130 removes relay coil voltage with signaling switching circuit 140, and the relay connector of often opening is opened, and is connected with relevant device with downstream components and is connected thereby disconnect AC power.In the operation that the rightmost side represents in Fig. 2 on off state figure, switching circuit 140 from conducting/closure (equipment connection) status transition to non-conduction/open (equipment does not connect) state.
According to a kind of feasible option, can record respectively the supply power voltage signal and surpass overvoltage cutout threshold (V LnOV Sh) situation, only surpassed overvoltage record threshold value but not overvoltage cutout threshold (OV with the supply power voltage signal Rc＜V Ln
Figure 394152DEST_PATH_IMAGE001
OV Sh) situation, for example, can keep two different overvoltage countings, one is used for record and only surpasses lower overvoltage record threshold value, another is used for record and surpasses higher overvoltage cutout threshold.
As shown in Figure 2, in case after watch-dog 100 is in off state 340(execution dwelling period program), no matter be supply power voltage signal V LnBe lower than overvoltage and disconnect threshold level OV ShOr supply power voltage signal V LnBe lower than overvoltage record threshold level OV Rc, that switching circuit 140 all keeps is non-conduction/open (cutting off the electricity supply) state.In order to transit back into normal operating conditions 320, supply power voltage signal V LnMust before control circuit 130 is carried out energising cycle program again, drop to certain a bit (UV between overvoltage and the undertension reconstruction threshold value Rs
Figure 642599DEST_PATH_IMAGE001
V Ln
Figure 864633DEST_PATH_IMAGE001
OV Rs), become on-state at this switch controlling signal, thus the 140 closed and conductings of control switch circuit, to transmit electric power to shielded equipment.For example, when using electromagnetic relay switch, control circuit 130 be the relay energy supply with signaling switching circuit 140, makes the joint-closure of often opening, thereby apparatus assembly and connection device transmit AC power downstream, with connection device.As supply power voltage signal V LnSurpass higher overvoltage cutout threshold OV ShThe time, switching circuit 140 cuts out, but can not reset into open mode, until supply power voltage signal V LnBe reduced to lower overvoltage and rebuild threshold value OV RsBelow, there is hysteresis in the switch controlling mechanism, prevented because the high-speed switch periodic phenomena that mains ripple causes.
According to the operation of overvoltage threshold value general introduction control circuit 130, as supply power voltage signal V LnBe lower than first (reconstruction) overvoltage threshold value, when switching circuit 140 was in nonconducting state, control circuit 130 control switch circuit 140 were converted to conducting state.As supply power voltage signal V LnWhen surpassing second (record) overvoltage threshold value, this threshold value is higher than first overvoltage threshold value, and switching circuit 140 is when being in conducting state, and control circuit 130 records overvoltage event, and control switch circuit 140 remains on conducting state.As supply power voltage signal V LnSurpass the 3rd (opening circuit) overvoltage threshold value, this threshold value is higher than second overvoltage threshold value, when switching circuit 140 was in conducting state, control circuit 130 control switch circuit 140 were transformed into nonconducting state, and selectively it are recorded as another overvoltage event.
Equally, if from normal operating conditions 320, the supply power voltage signal V of periodic monitoring LnBe reduced to and be lower than undertension record threshold value UV Rc(V Ln＜UV Rc) time, control circuit 130 is made a response by being transitioned into the not enough cond 350 of recording voltage, carries out the undertension logging program.The undertension event count is stored in the nonvolatile memory of control circuit 130.The undertension logging program comprises increases undertension counting, the count value that storage increases.In addition, the undertension logging program is determined instruction time by the timing module logging program, this value is denoted as the timing of undertension event.The same with overvoltage event, the undertension event time of record can be since a period of time of a upper event, or self clock cycle or interval a period of time after beginning, or one day time.Control circuit 130 selectively sends display control signal to display 150, to show the undertension count value that increases.In addition, by the SCI module, control circuit 130 can send the event information (for example, count value and clocking information) that contains undertension to external equipment.
In the not enough state 330 of recording voltage shown in Figure 3, although recorded a undertension event, switching circuit 140 also keeps conducting/closure, and the load equipment maintenance is connected with AC power.This on off state as the supply power voltage signal is found in the lower left of Fig. 2.When dropping to undertension, the supply power voltage signal rebuilds threshold value (UV Rs) below, not taking any action, switching circuit 140 remains closed (connection).If supply power voltage signal continuous decrease falls to undertension record threshold value (UV Rc) below, carry out undertension logging program (for example, increase progressively counting, writing time, control display, outside announcement is provided); Yet, provide to the switch controlling signal of switching circuit 140 and maintain (conducting) state of opening (for example, switch controlling signal continue closing switch circuit 140).
The supply power voltage signal may record threshold value (UV around undertension within a short period of time Rc) up and down fluctuation.Graphical state as shown in Figure 3, in order to prevent the not enough report of series of voltage, the supply power voltage signal must surpass undertension and rebuild threshold value (V LnUV Rs), thereby the supply power voltage signal is being dropped to (V below the undertension record threshold value Ln＜UV Rc) react and carry out before the operation of another undertension record, make watch-dog 100 return to normal operating conditions 320.In other words, in case watch-dog 100 is in the not enough state 350 of recording voltage, no longer recording voltage is not enough, until watch-dog 100 is at first got back to normal operating conditions 320, and then be transitioned into the not enough state 350 of recording voltage, or watch-dog 100 just can transfer the not enough state 350 of recording voltage when being transformed into off state 340 again to.The application possible according to another kind in case be in the not enough state 350 of recording voltage, can regularly be estimated supply power voltage signal V LnIf the supply power voltage signal still is positioned at undertension record threshold value (UV Rc) below, then can carry out another undertension logging program, thereby obtain regular reporting.
As shown in Figure 3, if the supply power voltage signal is reduced to undertension cutout threshold (V from the not enough voltage status 350 of recording voltage Ln＜UV Sh) below, watch-dog 100 can transfer off state 340 to.In this case; except again carrying out the undertension logging program; control circuit 130 also can be carried out the dwelling period program; make switch controlling signal become closed condition; make switching circuit 140 be transformed into non-conduction or " closing " state (cut-off switch); thereby the off device accessory power outlet is connected with power supply, comes protection equipment.In the operation that the leftmost side represents in Fig. 2 on off state figure, switching circuit 140 is from conducting/closure (equipment connection) status transition to non-conduction/disconnection (equipment does not connect) state.
According to a kind of feasible option, can record respectively the supply power voltage signal and be lower than undertension cutout threshold (V Ln＜UV Sh) situation and supply power voltage signal only be lower than undertension record threshold value, but not undertension cutout threshold (UV Sh＜V Ln
Figure 464111DEST_PATH_IMAGE001
UV Rc) situation, for example, can keep two different undertensions countings, one is used for record and is lower than the not enough record of high voltage threshold value, another is used for record and is lower than lower undertension cutout threshold.
Shown in Fig. 2 upper left quarter, in case after watch-dog 100 is in off state 340(execution dwelling period program), no matter be supply power voltage signal V LnExceed undertension cutout threshold UV ShOr supply power voltage signal V LnSurpass undertension record threshold value UV Rc, that switching circuit 140 all keeps is non-conduction/disconnect (cutting off the electricity supply) state.In order to be transitioned into normal operating conditions 320, supply power voltage signal V LnMust before control circuit 130 is carried out energising cycle program again, be increased to certain a bit (UV between undertension and the overvoltage reconstruction threshold value Rs
Figure 429793DEST_PATH_IMAGE001
V Ln
Figure 798326DEST_PATH_IMAGE001
OV Rs), become on-state at this switch controlling signal, thereby control switch circuit 140 is converted into a kind of conducting state (closure), to transmit electric power to shielded equipment.Because supply power voltage signal V LnBe reduced to undertension cutout threshold UV ShBelow, switching circuit 140 cuts out but can not restore, until supply power voltage signal V LnSurpass undertension and rebuild threshold value UV Rs, there is hysteresis in the switch controlling mechanism, prevented because the high-speed switch periodic phenomena that mains ripple causes.
Summarize the operation of the control circuit 130 relevant with the undertension threshold value, as supply power voltage signal V LnBe higher than first (reconstruction) undertension threshold value, switching circuit 140 is in nonconducting state, and control circuit 130 control switch circuit 140 are converted to conducting state.As supply power voltage signal V LnWhen being lower than second (record) undertension threshold value, this threshold value is lower than first undertension threshold value, and switching circuit 140 is when being in conducting state, the not enough event of control circuit 130 recording voltages, and control switch circuit 140 remains on conducting state.As supply power voltage signal V LnBe lower than the 3rd (opening circuit) undertension threshold value, this threshold value is lower than second undertension threshold value, and when switching circuit 140 was in conducting state, control circuit 130 control switch circuit 140 were transformed into nonconducting state, and selectively it are recorded as another undertension event.
Fig. 4 A and Fig. 4 B are functional flow diagrams, have summarized an example logic that the supply power voltage watch-dog is operated according to the supply power voltage condition.In operation 405, from entry condition, 130 pairs of control circuits receive is used for representing the V of voltage between the live wire of supply side and the zero line LnCarry out the A/D analog-to-digital conversion.In operation 410, determine digitized supply power voltage signal V LnWhether rebuild (UV between the threshold value between undertension and overvoltage Rs
Figure 925682DEST_PATH_IMAGE001
V Ln OV Rs).If so, namely carry out energising cycle program (operation 415), namely, control circuit 130 provides " opening " state of switch control signal to switching circuit 140, open switching circuit 140(conducting state) so that input supply side live wire wire be connected with output loading side live wire wire, thereby equipment accessory power outlet transmitting electric power connects load equipment and AC power (for example, under the normal operating conditions) downstream.If not so (for example, if supply power voltage signal V LnBe positioned at and rebuild the outer (V of threshold level LnOV RsOr V Ln＜UV Rs), logic is got back to operation 405, and before carrying out energising cycle program and getting back to normal operating conditions, control circuit 130 continues to detect supply power voltage signal V Ln, until it is positioned at acceptable level (for example, UV Rs
Figure 640883DEST_PATH_IMAGE001
V Ln
Figure 152939DEST_PATH_IMAGE001
OV Rs).
After carrying out energising cycle program, to the supply power voltage signal V that receives LnContinue periodically to carry out A/D analog-to-digital conversion (operation 420).In operation 425, compare supply power voltage signal and undertension cutout threshold UV ShIf the supply power voltage signal is less than undertension cutout threshold (V Ln＜UV Sh), carry out so undertension logging program (operation 430) and dwelling period program (operation 435), record above-mentioned undertension situation, closing switch circuit 140(nonconducting state), disconnect being connected of input (supply side) live wire wire and output (load-side) live wire wire, thereby prevent delivery of electrical energy to the upstream device accessory power outlet, disconnecting consumers equipment is connected with AC power.After carrying out the dwelling period program, logic is got back to initial operation 405, regularly compares supply power voltage signal V LnWith the reconstruction threshold value.
If in operation 425, the supply power voltage signal is (V below the undertension cutout threshold not Ln UV Sh), logic namely enters operation 440 so, relatively supply power voltage and undertension record threshold value UV RcIf the supply power voltage signal records threshold value (V less than undertension Ln＜UV Rc), can carry out so undertension logging program (operation 445), record above-mentioned undertension state, logic enters operation 450(Fig. 4 B).If the supply power voltage signal is not less than undertension record threshold value (V Ln
Figure 838316DEST_PATH_IMAGE002
UV Rc), this logic will directly enter operation 450 so, need not to carry out the undertension logging program.
In operation 450, compare supply power voltage signal and overvoltage cutout threshold OV ShIf the supply power voltage signal is greater than overvoltage cutout threshold (V LnOV Sh), to carry out so overvoltage logging program (operation 455) and dwelling period program (operation 435), record above-mentioned overvoltage condition, closing switch circuit 140(nonconducting state), disconnection input supply side live wire wire is connected with output loading side live wire wire, thereby prevent that electrical energy transfer from arriving the upstream device accessory power outlet, disconnecting consumers equipment is connected with AC power.After carrying out the dwelling period program, the logic route is got back to initial operation 405, compares termly supply power voltage signal V LnWith the reconstruction threshold value.
In operation 450, if the supply power voltage signal is not more than overvoltage cutout threshold (V Ln OV Sh), logic operates 460, relatively supply power voltage and overvoltage record threshold value OV RcIf the supply power voltage signal records threshold value (V greater than overvoltage LnOV Rc), overvoltage logging program (operation 465) will record overvoltage condition as mentioned above so, and logic enters operation 420, repeats to keep the compare cycle of switching circuit closure (connection) state.If the supply power voltage signal is not more than overvoltage record threshold value (V Ln
Figure 223347DEST_PATH_IMAGE001
OV Rc), logic directly enters operation 415, need not to carry out the overvoltage logging program.
What Fig. 5 described is the functional flow diagram of carrying out another example of supply power voltage monitor operations according to the supply power voltage state.In operation 505, from initial state, to the V of voltage between the expression live wire that receives and the zero line LnCarry out the A/D analog-to-digital conversion.In operation 510, determine supply power voltage signal V LnWhether rebuild (UV between the threshold value at undertension and overvoltage Rs V Ln
Figure 816188DEST_PATH_IMAGE001
OV Rs).If so, in carrying out energising cycle program (operation 515), control circuit 130 provides switch controlling signal to switching circuit 140, in " opening " state opens switch circuit 140(conducting state), connect input supply supply side live wire wire and output loading side live wire wire, thereby the equipment accessory power outlet provides electric energy downstream, connects load equipment and AC power (for example, normal operating conditions).If not so (for example, if supply power voltage signal V LnBe positioned at and rebuild the outer (V of threshold level LnOV RsOr V Ln＜UV Rs), logic can be got back to operation 505, is carrying out energising cycle program, and before being transitioned into normal operating conditions, control circuit 130 continues to detect supply power voltage signal V Ln, until this signal is positioned at acceptable level (for example, UV Rs
Figure 927363DEST_PATH_IMAGE001
V Ln
Figure 938045DEST_PATH_IMAGE001
OV Rs).
After carrying out energising cycle program, to the supply power voltage signal V that receives LnContinue the periodic A/D of execution analog-to-digital conversion (operation 520).In operation 525, comparative voltage is supplied with and undertension record threshold value UV RcIf the supply power voltage signal records threshold value (V less than undertension Ln＜UV Rc), can carry out so undertension logging program (operation 530), record above-mentioned undertension state, and the logic route enters operation 535, comparison supply power voltage signal and undertension cutout threshold UV ShIf the supply power voltage signal is less than undertension cutout threshold (V Ln＜UV Sh), namely carry out dwelling period program (operation 540), record above-mentioned undertension state, closing switch circuit 140(nonconducting state), disconnection input supply side live wire wire is connected with output loading side live wire wire, thereby stop delivery of electrical energy to the upstream device accessory power outlet, disconnecting consumers equipment and AC power.If control circuit 130 is reduced to and is lower than the undertension cutout threshold from being lower than undertension record threshold value, control circuit 130 also can be carried out undertension logging program (showing among Fig. 5) and dwelling period program.After carrying out the dwelling period program, logic is got back to initial operation 505, regularly compares supply power voltage signal V LnWith the reconstruction threshold value.
In operation 535, if the supply power voltage signal is not higher than undertension cutout threshold (V Ln UV Sh), the logic route is got back to operation 520 so, repeats comparison supply power voltage signal and various threshold value, and switching circuit then remains on closure (conducting) state.
In operation 525, if the supply power voltage signal is not less than undertension record threshold value (V Ln
Figure 126767DEST_PATH_IMAGE002
UV Rc), the logic route enters operation 545 so, relatively supply power voltage signal and overvoltage record threshold value OV RcIf the supply power voltage signal records threshold value (V greater than overvoltage LnOV Rc), carry out so overvoltage logging program (operation 550), record above-mentioned overvoltage condition, and the logic route enters operation 555, comparison supply power voltage signal and overvoltage cutout threshold OV ShIf the supply power voltage signal is greater than overvoltage cutout threshold (V LnOV Sh), carry out so dwelling period program (operation 540), record above-mentioned overvoltage condition, closing switch circuit 140(nonconducting state), disconnection input supply side live wire wire is connected with output loading side live wire wire, thereby stop electric energy to be sent to the upstream device accessory power outlet, disconnecting consumers equipment is connected with AC power.If control circuit 130 is from being higher than overvoltage record threshold value to being higher than the overvoltage cutout threshold, control circuit 130 also can be carried out overvoltage logging program (not showing among Fig. 5) and dwelling period program so.After carrying out the dwelling period program, the logic route is got back to initial operation 505, regularly compares supply power voltage signal V LnWith the reconstruction threshold value.
In operation 555, if the supply power voltage signal is not more than overvoltage cutout threshold (V Ln
Figure 838371DEST_PATH_IMAGE001
OV Sh), the logic route can be got back to operation 520 so, repeats comparison supply power voltage signal and multiple threshold value, and switching circuit then remains on closure (conducting) state.
In operation 545, if the supply power voltage signal is not more than overvoltage record threshold value (V Ln
Figure 890509DEST_PATH_IMAGE001
OV Rc), the logic route can be got back to operation 520 so, repeats comparison supply power voltage signal and multiple threshold value, and switching circuit then remains on closure (conducting) state.The present invention is not limited to Fig. 4 A, Fig. 4 B and described any one specific embodiment of Fig. 5, can adopt multiple different operation to realize the present invention.
Have multiple different record and the level that opens circuit, can allow record (for example can destroy the overvoltage of connection device and undertension, the history of establishment overvoltage and undertension event), need not the power supply (for example, closing the equipment of connection) of real cut-out and connection device.May damage the supply voltage level (for example, beyond cutout threshold) of connection device, can and protect connection device to deal with by recording events and disconnection.
As shown in Figure 1, the serial communication interface of installing on the plate (SCI) module to external equipment (for example allows control circuit 130, a computer, a microcontroller, a memory device, Deng) transmit the information such as the state of watch-dog 100 and event history (for example, overvoltage and undertension counting), be used for the information storage and analyze.Except from watch-dog 100 to outside equipment transfering data, the SCI module also allows the data such as control parameter from external equipment to the filter apparatus transmission equipment.For example, for a kind of selection, external equipment can provide overvoltage or undertension threshold value to control circuit 130, covers or replace previous storing value default value.
In a kind of specific embodiment, for example, watch-dog 100 can connect with the computer of a program of operation (for example, quick basic or C LISP program LISP), in other respects, allow the terminal use from a row overvoltage and undertension threshold level, to select.The threshold value of these user selections can be transferred to control circuit 130.The threshold value that control circuit 130 usefulness terminal uses select is threshold value that use or acquiescence before replacing or rewriteeing.Owing to watch-dog 100 for protecting various sensitive equipments to design, this feature allows self-defined record and the cutout threshold that is suitable for connection device of terminal use.
According to another characteristic, control circuit 130 is able to programme to come executive program to interrupt with response.In a specific embodiment, configuration control circuit 130 uses the timing module that loads on the plate, starts timing and interrupts, and per second is carried out " incremental time " program.In this case, operation shown in the flow chart among control circuit 130 execution graph 4A-4B or Fig. 5, per second interrupts carrying out " incremental time " program, to continue record from nearest recording events (overvoltage, undertension, power failure or surge event) running time (second, minute, hour and day) of rising.Therefore, in order to respond above-mentioned electric source disturbance, except increasing and storage application affairs counting, control circuit 130 is also stored institute's elapsed time from previous event (for example, the time between the event).
By using serial communication interface, connect the computer of control circuit 130 and an operation customization diagnostic software, can analyze, show and store event data (elapsed-time standards between event count and the event).By using the window time, and the time between the record recent events and with the connection of computer, the customization diagnostic software can carry out computations to the event of precedence record, and the time between the event that records is converted into actual time/date (time mark) that event occurs.
Can recognize that above-mentioned control circuit 130 just represents a kind of possible implementation, also have other a lot of methods of using multiple hardwares, software, firmware and combination thereof, also can be used for assessing and overvoltage and undertension being made response.
Fig. 6 has illustrated a complete electric source filter circuit 600, and it comprises the assembly that supply power voltage watch-dog 100 shown in Figure 1 is connected with other electric source filter circuit.Electric source filter circuit 600 can be connection, take microcontroller as the basis compound filter (surgesuppressor; the EMI Electromagnetic interference filter); suppress AC power transition and EMI electromagnetic interference, thereby the equipment that protection connects is avoided the damage and fracture relevant with transient changing/noise.A shunt 610 is connected to live wire, zero line and the ground wire of input, and a filter 620 connects the live wire of input and the wire (for example, the upstream of supply power voltage monitor component) of zero line subsequently.These steps suppress voltage transient and EMI/RFI electromagnetism/radio frequency interference.The fixture 630(clamp stage that the wire of being connected with live wire, zero line and the ground wire of output is connected), is positioned at switching circuit 140 downstreams, is used for before the electrical energy transfer through filtering arrives the equipment that connects, eliminating the voltage transient of any remnants.Perhaps, the control circuit of control switch circuit 140 states can also be controlled the state of a relay, connects and is connected being connected of fixture 630 and zero line wire, comes the assembly of harmonious protection fixture 630.Shunt 610, filter 620 and fixture 630 are similar to that application number is 5,136,455 described parts in the U.S. Patent application, as example, its disclosed content all are incorporated herein by reference.
In this set, except monitoring overvoltage and undertension, control circuit 130 can also be monitored the operating voltage of other types and be disturbed or falsehood.For example, control circuit 130 can also assess whether there is line fault, for example is the state (for example, live wire and zero line are put upside down) that ground wire disconnects (open ground) or the pole reversal.In addition, control circuit 130 can also be monitored overtemperature state and supercurrent state.If generation power disturbance, control circuit can also increase corresponding power disturbance counting, and this counting is stored in the memory.
Selectively be that control circuit 130 can show at display 150 information (for example, line fault type, etc.) of relevant power disturbance.In in due course, control circuit 130 also can be connected with the electric power of equipment accessory power outlet in 140 disconnections of signaling switching circuit, comes protection equipment.As response, switching circuit 140 is according to (for example whether detecting a kind of mode of operation that does not meet needs, overvoltage condition, undertension, line fault, overtemperature, supercurrent state, etc.) connect or disconnect being connected between the connection device of live wire wire and load-side.
Above described the preferential embodiment of the supply power voltage watch-dog of new improvement, can imagine that obtaining the person skilled in art can expect on above-described basis other modification, variation or change.Therefore, these all changes that can expect all belong in the scope that the appended concrete right of the present invention requires.Although used specific term here, all be to be described as better purpose, be not in order to limit it.

Claims (20)

1. supply power voltage watch-dog is used for the over-voltage condition of monitoring AC power, it is characterized in that, comprising:
A switching circuit, be used for connecting the input lead that can be communicated with AC power and the output lead that can be communicated with load, when conducting state, described switching circuit is electrically connected described input lead and output lead, and when nonconducting state, described switching circuit then disconnects the electric connection between described input lead and the output lead;
A power supply signal regulating circuit is for generation of the supply power voltage signal that represents AC supply voltage;
A control circuit, for the supply power voltage signal of monitoring overvoltage condition, wherein:
When the supply power voltage signal is lower than first overvoltage threshold value, and described switching circuit is when being in nonconducting state, and it can the control switch circuit conversion be conducting state that described control circuit is set as;
When the supply power voltage signal surpasses second overvoltage threshold value that is higher than first overvoltage threshold value, and described switching circuit is when being in conducting state, and described control circuit is set as and can records overvoltage event, and the control switch circuit remains on conducting state;
When the supply power voltage signal surpasses the 3rd an overvoltage threshold value that is higher than second overvoltage threshold value, and described switching circuit is when being in conducting state, and it can the control switch circuit conversion be nonconducting state that described control circuit is set as.
2. supply power voltage watch-dog as claimed in claim 1 is characterized in that, when described supply power voltage signal surpasses the 3rd overvoltage threshold value, and switching circuit is when being in conducting state, and described control circuit is set as and can further records overvoltage event.
3. supply power voltage watch-dog as claimed in claim 1 is characterized in that, described control circuit is by increasing the overvoltage event counting and overvoltage event is recorded in the timing of record overvoltage event.
4. supply power voltage watch-dog as claimed in claim 1 is characterized in that:
When the supply power voltage signal surpasses first undertension threshold value, and described switching circuit is when being in nonconducting state, and described control circuit is set as and can be converted into conducting state by the control switch circuit;
When the supply power voltage signal is lower than one less than second undertension threshold value of first undertension threshold value, and when described switching circuit is in conducting state, described control circuit is set as can recording voltage not enough event, and controls described switching circuit and remain on conducting state;
When the supply power voltage signal is lower than one less than the 3rd undertension threshold value of second undertension threshold value, and described switching circuit is when being in conducting state, and described control circuit is set as can be controlled described switching circuit and be transformed into nonconducting state.
5. supply power voltage watch-dog as claimed in claim 4 is characterized in that, when described supply power voltage signal is lower than the 3rd undertension threshold value, and switching circuit is when being in conducting state, and described control circuit is set as the further not enough event of recording voltage.
6. supply power voltage watch-dog as claimed in claim 4 is characterized in that, described control circuit comes the not enough event of recording voltage by increasing the not enough event timing of undertension event count and recording voltage.
7. supply power voltage watch-dog as claimed in claim 1 is characterized in that described supply power voltage signal is a kind of ac voltage signal.
8. supply power voltage watch-dog as claimed in claim 1 is characterized in that described supply power voltage signal is a kind of d. c. voltage signal.
9. supply power voltage watch-dog as claimed in claim 1 is characterized in that described AC supply voltage is the voltage between a kind of live wire and the zero line.
10. supply power voltage watch-dog as claimed in claim 1 is characterized in that described AC supply voltage is the voltage between a kind of live wire and the ground wire.
11. the supply power voltage watch-dog is characterized in that as claimed in claim 1, described input lead is an input live wire wire, and described output lead is an output live wire wire.
12. the supply power voltage watch-dog is characterized in that as claimed in claim 1, described input lead is a zero line wire, and described output conductor is an output zero line wire.
13. method for the overvoltage condition of monitoring the ac power supply with supply power voltage watch-dog, it is characterized in that, be included in described supply power voltage watch-dog a switching circuit is set, the output lead that connects the input lead that to connect with AC power and can connect with load, wherein, when conducting state, described switching circuit is electrically connected described input lead and described output lead, and under nonconducting state, described switching circuit disconnects the electric connection between described output lead and the described input lead, and described method comprises:
Produce the supply power voltage signal that represents AC supply voltage;
When the supply power voltage signal is lower than first overvoltage threshold value, and described switching circuit is converted to conducting state with described switching circuit when being in nonconducting state;
When the supply power voltage signal surpasses second overvoltage threshold value that is higher than first overvoltage threshold value, and described switching circuit is when being in conducting state, the record overvoltage event, and described switching circuit maintained conducting state;
When the supply power voltage signal surpasses the 3rd an overvoltage threshold value that is higher than second overvoltage threshold value, and switching circuit is converted to nonconducting state with described switching circuit when being in conducting state.
14. method is characterized in that as claimed in claim 13, also comprises:
When described supply power voltage signal surpasses the 3rd overvoltage threshold value, and switching circuit is when being in conducting state, the record overvoltage event.
15. method is characterized in that as claimed in claim 13, comprises overvoltage event counting and the record overvoltage event time of increasing progressively when recording described overvoltage event.
16. method is characterized in that as claimed in claim 13, also comprises:
When the supply power voltage signal surpasses first undertension threshold value, and switching circuit is converted to conducting state with described switching circuit when being in nonconducting state;
When the supply power voltage signal is lower than one less than second undertension threshold value of first undertension threshold value, and switching circuit is when being in conducting state, the not enough event of recording voltage, and described switching circuit maintained conducting state;
When the supply power voltage signal is lower than one less than the 3rd undertension threshold value of second undertension threshold value, and switching circuit is converted to nonconducting state with described switching circuit when being in conducting state.
17. method is characterized in that as claimed in claim 16, also comprises:
When described supply power voltage signal is lower than the 3rd undertension threshold value, and switching circuit is when being in conducting state, the not enough event of recording voltage.
18. method is characterized in that as claimed in claim 16, comprises the not enough event count of incremental voltage and the not enough event time of recording voltage when recording described undertension event.
19. a nonvolatile computer readable medium is characterized in that, encodes by the software that comprises computer executable instructions, when a processor is carried out this instruction, makes described processor can carry out following functions:
Relatively represent supply power voltage signal and a plurality of overvoltage threshold value of AC supply voltage;
When the supply power voltage signal is lower than first overvoltage threshold value, control a switching circuit and be converted to conducting state from nonconducting state, described switching circuit is configured to connect input lead and output lead that energy is communicated with load that an energy is communicated with AC power, in conducting state, described switching circuit is electrically connected described input lead and output lead, at nonconducting state, described switching circuit disconnects the electric connection between described input lead and the output lead;
When the supply power voltage signal surpasses second overvoltage threshold value that is higher than first overvoltage threshold value, the record overvoltage event, and keep described switching circuit in conducting state;
When the supply power voltage signal surpasses the 3rd an overvoltage threshold value that is higher than second overvoltage threshold value, control described switching circuit and be converted to nonconducting state from conducting state.
20. nonvolatile computer readable medium as claimed in claim 19 is characterized in that, being used for the computer executable instructions that the software of this medium of coding further comprises is when processor is carried out this instruction, to make processor can also carry out following functions:
More described supply power voltage signal and a plurality of undertension threshold value;
When the supply power voltage signal surpasses first undertension threshold value, control described switching circuit and be converted to conducting state from nonconducting state;
When the supply power voltage signal was lower than second undertension threshold value less than first undertension threshold value, the not enough event of recording voltage was kept described switching circuit in conducting state;
When the supply power voltage signal is lower than the 3rd a undertension threshold value less than second undertension threshold value, controls described switching circuit and be converted to nonconducting state from conducting state.
CN201210257235.XA 2011-08-04 2012-07-24 Supply voltage monitor Active CN102916388B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/198,137 2011-08-04
US13/198,137 US8520349B2 (en) 2011-01-31 2011-08-04 Supply voltage monitor

Publications (2)

Publication Number Publication Date
CN102916388A true CN102916388A (en) 2013-02-06
CN102916388B 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105140926A (en) * 2015-10-21 2015-12-09 珠海格力电器股份有限公司 Power supply control method and control system of electrical equipment
CN106574946A (en) * 2014-09-17 2017-04-19 弗兰克公司 Triggered operation and/or recording of test and measurement or imaging tools
CN110691978A (en) * 2017-05-31 2020-01-14 萨基姆通讯能源及电信联合股份公司 Single-phase electric meter
CN117674447A (en) * 2023-12-07 2024-03-08 中冶建筑研究总院有限公司 Passive load monitoring method and system

Citations (10)

* Cited by examiner, † Cited by third party
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
US20080247105A1 (en) * 2007-04-05 2008-10-09 Georgia Tech Research Corporation Voltage Surge and Overvoltage Protection
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
US20110063759A1 (en) * 2009-09-14 2011-03-17 Electronic Systems Protection, Inc. Hybrid Switch Circuit
CN102132479A (en) * 2008-08-29 2011-07-20 夏普株式会社 Power supply device and lighting device

Patent Citations (10)

* Cited by examiner, † Cited by third party
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
US20080247105A1 (en) * 2007-04-05 2008-10-09 Georgia Tech Research Corporation Voltage Surge and Overvoltage Protection
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
US20110063759A1 (en) * 2009-09-14 2011-03-17 Electronic Systems Protection, Inc. Hybrid Switch Circuit
CN201629719U (en) * 2010-02-02 2010-11-10 北京科技大学 Servo driving device for robot asynchronous motor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106574946A (en) * 2014-09-17 2017-04-19 弗兰克公司 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 Power supply control method and control system of electrical equipment
CN110691978A (en) * 2017-05-31 2020-01-14 萨基姆通讯能源及电信联合股份公司 Single-phase electric meter
CN117674447A (en) * 2023-12-07 2024-03-08 中冶建筑研究总院有限公司 Passive load monitoring method and system

Also Published As

Publication number Publication date
CN102916388B (en) 2017-04-12

Similar Documents

Publication Publication Date Title
EP2482085B1 (en) Supply voltage monitor
EP2555004B1 (en) Power monitoring and management with remote access
CN111226366A (en) Method and apparatus for adaptive AC/DC surge protection
US10090662B2 (en) Power monitoring and management with remote access
US9166396B2 (en) Power conditioning, distribution and management
US11791620B2 (en) Solid-state circuit breaker with self-diagnostic, self-maintenance, and self-protection capabilities
CN103684370A (en) Semiconductor device including short-circuit protection
US9299524B2 (en) Line cord with a ride-through functionality for momentary disturbances
CN102916388A (en) Supply voltage monitor
US11853095B2 (en) Systems and methods for managing energy-related stress in an electrical system
US20200060011A1 (en) Method of protecting and detecting a surge event in a node
WO2018151935A1 (en) Method and apparatus for adaptive ac/dc surge protection
EP2808968A1 (en) Power conditioning, distribution and management
CN106159894B (en) Small-sized network acquires breaker
CN105359413A (en) Circuit arrangement for protecting at least one component part of a two-wire circuit
KR101200534B1 (en) Apparatus and method for protecting from surge and overvoltage noise
RU147371U1 (en) ELECTRICITY METER WITH ADAPTIVE AUTOMATIC CONTROL SYSTEM
KR101547597B1 (en) Apparatus for detecting electrical degradation current of surge protecting device
CN105576794B (en) A kind of communication power supply circuit and communication power supply system
WO2016016689A1 (en) Smart power management system for electrical circuits
CN116455051A (en) Power communication architecture with diagnostics, analytics, and remote configuration for enhanced operation and maintenance
KR20200129935A (en) Intelligent Surge protecter with life forecast function
BR102015031551A2 (en) ARRANGEMENT APPLIED TO A MICROCONTROLLED ELECTRONIC DEVICE FOR PROTECTION OF ELECTRICAL AND ELECTRONIC APPLIANCES WITH MANAGEMENT, PROCESSING AND CONTROL MODULE

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