CN105720554A - Overvoltage protection device and operation method thereof - Google Patents
Overvoltage protection device and operation method thereof Download PDFInfo
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- CN105720554A CN105720554A CN201410738280.6A CN201410738280A CN105720554A CN 105720554 A CN105720554 A CN 105720554A CN 201410738280 A CN201410738280 A CN 201410738280A CN 105720554 A CN105720554 A CN 105720554A
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Abstract
The invention discloses an overvoltage protection device. The overvoltage protection device includes an input voltage detection module and a second switch, wherein the input voltage detection module includes a switching group, a rectifying circuit, a voltage detection circuit and a voltage protection circuit; the rectifying circuit rectifies an alternating current power supply to generate a direct current voltage; when the voltage detection circuit detects that the direct current voltage achieves a first overvoltage value, the voltage protection circuit outputs a second switching signal to control the second switch so as to prevent the alternating current power supply to supply power for a load; and when the voltage detection circuit detects that the direct current voltage continuously increases to a second overvoltage value, the voltage protection circuit outputs a first switching signal to control the switching group so as to provide limit voltage and limit current protection.
Description
Technical field
The present invention relates to over-voltage protection technique field, particularly relate to a kind of utilization and turn off relay switch and reach to block the overvoltage protection powered of abnormal voltage and operational approach thereof.
Background technology
For mains supply instability country or region, abnormally high-voltage would generally cause the damage of power supply spare part even to burn, and causes that household appliances fire hazard accident occurs, the risk even safety of the person and property damaged.
The detection of current existing abnormal voltage generally includes abnormal voltage testing circuit and relay switching circuit with protection device.Refer to the circuit diagram that Fig. 1 is the detection of existing abnormal voltage and protection device.When this alternating current power supply Vac occurs abnormal voltage to power, in order to not allow abnormal voltage affect rear class change-over circuit and this load 20A, therefore abnormal voltage testing circuit 10A can control relay switch 30A cut-off so that this abnormally high-voltage is blocked, without destroying backend load 20A.
But, owing to the divider resistance on relay switching circuit can become big along with entirety enters electrical power with relay, and need the relay selecting high-power divider resistance and resistance to electric current big, therefore, will be unable to meet the demand of miniaturization.Existing household electrical appliances are used or commodity electrical device; such as business air conditioner or washing machine, because of the limited space of electric fitting box, add that client only needs extra alternating current power supply overvoltage protection mechanism; when high by Ac Dump, existing driving plate is not made to be damaged.When alternating voltage recovers normal, it is possible to continue to supply electricity to driving plate and use.
Therefore; how to design a kind of overvoltage protection and operational approach thereof; when detecting that alternating current power supply is powered extremely; can directly control switch module; reach interruption of power supply and voltage limit and threshold currents protection are provided, becoming the desired big problem overcoming and solving of the present inventor.
Summary of the invention
A purpose for the present invention is in that to provide a kind of overvoltage protection, to overcome problem of the prior art.Therefore the present invention provides a kind of overvoltage protection, connects an alternating current power supply and a load.This overvoltage protection includes an input voltage measurement module and a second switch.This input voltage measurement module includes a switches set, a rectification circuit, a voltage detecting circuit and a voltage protection circuit.This switches set connects one end of this alternating current power supply.This rectification circuit connects the other end and this switches set of this alternating current power supply, and to receive this alternating current power supply, and this alternating current power supply of rectification is to produce a DC voltage.This voltage detecting circuit receives this DC voltage, to export a voltage signal.This voltage protection circuit receives this voltage signal, to export one first switching signal and a second switch signal.This second switch connects this alternating current power supply, this load and this input voltage measurement module.Wherein, when this voltage detecting circuit detects that this DC voltage reaches first overvoltage value, this second switch signal controls this second switch, to block this alternating current power supply to this load supplying；When this voltage detecting circuit detect this DC voltage continue to increase reach second overvoltage value time, this first switching signal controls this switches set, to provide the protection of voltage limit and threshold currents.
Another object of the present invention is to provide the operational approach of a kind of overvoltage protection, to overcome problem of the prior art.Therefore this overvoltage protection of the present invention connects an alternating current power supply and a load, and this operational approach includes: (a) provides an input voltage measurement module, receives this alternating current power supply, and this alternating current power supply of rectification is to produce a DC voltage；And export one first switching signal and a second switch signal；B () provides a switches set and a second switch；C (), when this voltage detecting circuit detects that this DC voltage reaches first overvoltage value, this second switch signal controls this second switch, to block this alternating current power supply to this load supplying；And (d) when this voltage detecting circuit detect this DC voltage continue to increase reach second overvoltage value time, this first switching signal controls this switches set, to provide the protection of voltage limit and threshold currents.
In order to be able to be further understood that the present invention reaches technology, means and the effect that predetermined purpose is taked, refer to the detailed description below in connection with the present invention and accompanying drawing, believe the purpose of the present invention, feature and feature, when can thus be goed deep into and concrete understanding, but Figure of description only provides reference and use is described, not it is used for the present invention is any limitation as.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the detection of existing abnormal voltage and protection device；
Fig. 2 is the schematic diagram that the present invention one overvoltage protection is applied between alternating current power supply and load protection；
Fig. 3 is the circuit diagram of this overvoltage protection of the present invention；
Fig. 4 A is the circuit diagram of this overvoltage protection first embodiment of the present invention；
Fig. 4 B is the circuit diagram of this overvoltage protection the second embodiment of the present invention；
Fig. 4 C is the circuit diagram of this overvoltage protection the 3rd embodiment of the present invention；
Fig. 5 provides the waveform diagram of overvoltage protection operation for this overvoltage protection of the present invention；And
Fig. 6 is the flow chart of overvoltage protection operational approach of the present invention.
Wherein description of reference numerals is as follows:
(prior art)
Vac alternating current power supply
10A abnormal voltage testing circuit
20A load
30A relay switch
(present invention)
Vac alternating current power supply
10 overvoltage protections
90 loads
12 input voltage measurement modules
121 switches set
122 rectification circuits
123 voltage detecting circuits
124 voltage protection circuits
125 main capacitances
126 accessory power supply supply circuits
14 second switches
16 electric fuse unit
1211 first switches
1212 resistance
1213 negative temperature coefficient assemblies
Vb DC voltage
Sv voltage signal
SR1First switching signal
SR2Second switch signal
Voth1 the first overvoltage value
Voth2 the second overvoltage value
Vs1 the first voltage
Vs2 the second voltage
T0～t5 time point
S10～S40 step
Detailed description of the invention
In connection with the technical content and a detailed description, accompanying drawing is coordinated to illustrate as follows:
Refer to Fig. 2 is the schematic diagram that the present invention one overvoltage protection is applied between alternating current power supply and load protection.This overvoltage protection 10 is connected between an alternating current power supply Vac and a load 90; in order to detect the power supply situation of this alternating current power supply Vac; particularly in when this alternating current power supply Vac exception; such as, when overvoltage is powered, this load 90 is powered by this overvoltage protection 10 to block this alternating current power supply Vac.
Refer to the circuit diagram that Fig. 3 is this overvoltage protection of the present invention.This overvoltage protection 10 includes input voltage measurement module 12, second switch 14 and an electric fuse unit 16.This second switch 14 is connected in series this electric fuse unit 16, and this second switch 14 of this series connection and this electric fuse unit 16 are electrically connected between this alternating current power supply Vac and this load 90.When this alternating current power supply is to this load supplying, if this tandem paths powers on when flowing through big, this electric fuse unit disconnects and flows through this load with interruptive current.Additionally, this second switch 14 also can be electrically connected this input voltage measurement module 12.Wherein, this second switch 14 is a relay switch (relay), but is not limited system.
This input voltage measurement module 12 includes switches set 121, rectification circuit 122, voltage detecting circuit 123, voltage protection circuit 124, main capacitance 125 and an accessory power supply supply circuit 126.The input of this switches set 121 connects one end of this alternating current power supply Vac.The input of this rectification circuit 122 connects the other end and this switches set 121 of this alternating current power supply Vac, and to receive this alternating current power supply Vac, and this alternating current power supply Vac of rectification is to produce a DC voltage Vb.This main capacitance 125 is connected in parallel the outfan of this rectification circuit 122, so that this DC voltage Vb to be filtered operation.In other words, the voltage difference size at these main capacitance 125 two ends is namely equal to this DC voltage Vb size.This accessory power supply supply circuit 126 is electrically connected this main capacitance 125, with this DC voltage Vb after accepting filter, and change this DC voltage Vb, to export the DC voltage of different voltage swing, such as+12V ,+5V ... etc., to provide the power supply needed for the circuit in this input voltage measurement module 12.With the present embodiment, this accessory power supply supply circuit 126 exports one first voltage Vs1 and one second voltage Vs2, and wherein this first voltage Vs1 is to power to this voltage protection circuit 124；This second voltage Vs2 is to power to this voltage detecting circuit 123.
This voltage detecting circuit 123 receives the voltage difference at these main capacitance 125 two ends, i.e. this DC voltage Vb, to export a voltage signal Sv.This voltage protection circuit 124 receives this voltage signal Sv, to export one first switching signal SR1With a second switch signal SR2.When this voltage detecting circuit 123 detects that this DC voltage Vb reaches a first overvoltage value Voth1, this second switch signal SR2Control this second switch 14, this load 90 is powered blocking this alternating current power supply Vac.When this voltage detecting circuit 123 detect this DC voltage Vb continue to increase reach a second overvoltage value Voth2 time, this first switching signal SR1Control this switches set 121, to provide voltage limit and threshold currents protection.As for the operation of this overvoltage protection 10, will be discussed in detail below.
Refer to the circuit diagram that Fig. 4 A is this overvoltage protection first embodiment of the present invention.In sum, in the present invention, this switches set 121 mainly comprises one first switch 1211, one resistance 1212 and a negative temperature coefficient assembly 1213.It is worth mentioning, for the application of backend load or the different size of electric device, the electric connection topology that those assemblies of this switches set 121 of design are different can be passed through, to realize overvoltage protection.Wherein, this first switch 1211 is a relay switch (relay), but is not limited system.
In this first embodiment as shown in Figure 4 A, this first switch 1211 is a three-terminal assembly, has one first end, one second end and is held jointly.This resistance 1212 is a two ends assembly with this negative temperature coefficient assembly 1213, is respectively provided with one first end and one second end.This of this first switch 1211 holds this input connecting this rectification circuit 122 jointly；This first end of this first switch 1211 connects this second end of this negative temperature coefficient assembly 1213；And this second end of this first switch 1211 connects this second end of this resistance 1212.Wherein, this first switch 1211 is by this voltage protection circuit 124 this first switching signal S producedR1Controlled.This first end of this negative temperature coefficient assembly 1213 connects this first end of this resistance 1212, is then then connected to this alternating current power supply Vac.
Refer to the circuit diagram that Fig. 4 B is this overvoltage protection the second embodiment of the present invention.In this second embodiment as shown in Figure 4 B, this first switch 1211 is a three-terminal assembly, has one first end, one second end and is held jointly.This resistance 1212 is a two ends assembly with this negative temperature coefficient assembly 1213, is respectively provided with one first end and one second end.This of this first switch 1211 holds this input connecting this rectification circuit 122 jointly；This first end of this first switch 1211 connects this first end and this alternating current power supply Vac of this resistance 1212；This second end of this first switch 1211 connects this second end of this resistance 1212.Wherein, this first switch 1211 is by this voltage protection circuit 124 this first switching signal S producedR1Controlled.This first end of this negative temperature coefficient assembly 1213 connects the outfan of this rectification circuit 122；This second end of this negative temperature coefficient assembly 1213 connects this main capacitance 125.
Refer to the circuit diagram that Fig. 4 C is this overvoltage protection the 3rd embodiment of the present invention.In the 3rd embodiment as shown in Figure 4 C, this first switch 1211, this resistance 1212 and this negative temperature coefficient assembly 1213 are a two ends assembly, are respectively provided with one first end and one second end.This first end of this first switch 1211 connects this second end of this resistance 1212 and this input of this rectification circuit 122；This second end of this first switch 1211 connects this first end and this alternating current power supply Vac of this resistance 1212.Wherein, this first switch 1211 is by this voltage protection circuit 124 this first switching signal S producedR1Controlled.This first end of this negative temperature coefficient assembly 1213 connects the outfan of this rectification circuit 122；This second end of this negative temperature coefficient assembly 1213 connects this main capacitance 125.
Refer to Fig. 5 and the waveform diagram of overvoltage protection operation is provided for this overvoltage protection of the present invention.Fig. 5 from top to bottom shows this alternating current power supply Vac, this DC voltage Vb, this first switching signal S respectivelyR1And this second switch signal SR2Waveform.Coordinating with reference to Fig. 3, after time point t0, this alternating current power supply Vac is that normal voltage is powered, and therefore, this voltage detecting circuit 123 detects that this DC voltage Vb is certain value.Assuming after time point t1, this alternating current power supply Vac starts to increase singularly, and therefore, the voltage difference at these main capacitance 125 two ends, namely this DC voltage Vb is gradually increased accordingly.At time point t2, when this voltage detecting circuit 123 detects that this DC voltage Vb reaches this first overvoltage value Voth1 set by this input voltage measurement module 12, this voltage protection circuit 124 exports this second switch signal S of low levelR2, to control (turn off turnedoff) this second switch 14, this load 90 is powered blocking this alternating current power supply Vac.Thus, to prevent the abnormal pressure situation of this alternating current power supply Vac from this load 90 of rear end or the electric device, the equipment that are electrically connected are caused damage.
Furthermore; once this exception alternating current power supply Vac continues to increase; for the present embodiment; at time point t3; when this voltage detecting circuit 123 detects that this DC voltage Vb reaches this second overvoltage value Voth2 set by this input voltage measurement module 12, this voltage protection circuit 124 exports this first switching signal S of low levelR1, to control (turning off turnedoff) this switches set 121, to provide voltage limit and threshold currents protection.
Once this alternating current power supply Vac recovers normal power supply, it is, at time point t4, when this voltage detecting circuit 123 detects that this DC voltage Vb is reduced to this second overvoltage value Voth2, this voltage protection circuit 124 exports this first switching signal S of high levleR1With enable (or conducting turnedon) furthermore this switches set 121; if when this alternating current power supply Vac continues to reduce; at time point t5; when this voltage detecting circuit 123 detects that this DC voltage Vb is reduced to this first overvoltage value Voth1, this voltage protection circuit 124 exports this second switch signal S of high levleR2, with enable (or conducting turnedon) this second switch 14, so, by this switches set 121 of involution and this second switch 14 so that this load 90 can be normally powered by this alternating current power supply Vac.
It is worth mentioning, for aforementioned: when this voltage detecting circuit 123 detects that this DC voltage Vb reaches this second overvoltage value Voth2 set by this input voltage measurement module 12, this voltage protection circuit 124 exports this first switching signal S of low levelR1, to control (turning off turnedoff) this switches set 121.For technology contents, for the enforcement aspect that this switches set 121 is different, will there is different difference in operation, as described below.
Please coordinate with reference to Fig. 4 A again, under the circuit framework of this first switch 1211, this resistance 1212 and this negative temperature coefficient assembly 1213, when this alternating current power supply Vac is normal power supply, this first switching signal SR1With control this first switch 1211 switch to this first switch 1211 these first ends with this first switch 1211 this jointly hold conducting so that this load 90 of rear end, via this negative temperature coefficient assembly 1213, is powered by this alternating current power supply Vac.Wherein, this negative temperature coefficient assembly 1213 is to provide electric current of surging (inrushcurrent) protection during system start-up.Otherwise, as this second overvoltage value Voth2 set by this DC voltage Vb reaches this input voltage measurement module 12, this first switching signal SR1Control this first switch 1211 switch to this first switch 1211 these second ends with this first switch 1211 this jointly hold conducting; make this alternating current power supply Vac via this resistance 1212; and then voltage limit and threshold currents protection are provided; namely by this resistance 1212 as a current-limiting resistance; threshold currents is provided to protect this input voltage measurement module 12; and by this resistance 1212 as a divider resistance, provide voltage limit to protect this input voltage measurement module 12.
Please coordinate with reference to Fig. 4 B again, under the circuit framework of this first switch 1211, this resistance 1212 and this negative temperature coefficient assembly 1213, when this alternating current power supply Vac is normal power supply, this first switching signal SR1Controlling this first switch 1211 switches to this of these first ends of this first switch 1211 and this first switch 1211 jointly to hold conducting so that this load 90 of rear end is powered by this alternating current power supply Vac via this first switch 1211.Wherein, this negative temperature coefficient assembly 1213 is to provide electric current of surging (inrushcurrent) protection during system start-up.Otherwise, as this second overvoltage value Voth2 set by this DC voltage Vb reaches this input voltage measurement module 12, this first switching signal SR1Control this first switch 1211 switch to this first switch 1211 these second ends with this first switch 1211 this jointly hold conducting; make this alternating current power supply Vac via this resistance 1212; and then voltage limit and threshold currents protection are provided; namely by this resistance 1212 as a current-limiting resistance; threshold currents is provided to protect this input voltage measurement module 12; and by this resistance 1212 as a divider resistance, provide voltage limit to protect this input voltage measurement module 12.
Please coordinate with reference to Fig. 4 C again, under the circuit framework of this first switch 1211, this resistance 1212 and this negative temperature coefficient assembly 1213, when this alternating current power supply Vac is normal power supply, this first switching signal SR1Control this first switch 1211 and switch to this first end of this first switch 1211 and this second end conducting of this first switch 1211, namely control this first switch conduction so that this load 90 of rear end is powered by this alternating current power supply Vac via this first switch 1211 bypass.Wherein, this negative temperature coefficient assembly 1213 is to provide electric current of surging (inrushcurrent) protection during system start-up.Otherwise, as this second overvoltage value Voth2 set by this DC voltage Vb reaches this input voltage measurement module 12, this first switching signal SR1Controlling this first switch 1211 switches to this first end of this first switch 1211 to turn off with this second end of this first switch 1211; make this alternating current power supply Vac via this resistance 1212; and then voltage limit and threshold currents protection are provided; namely by this resistance 1212 as a current-limiting resistance; threshold currents is provided to protect this input voltage measurement module 12; and by this resistance 1212 as a divider resistance, provide voltage limit to protect this input voltage measurement module 12.
Refer to the flow chart that Fig. 6 is overvoltage protection operational approach of the present invention.This overvoltage protection connects an alternating current power supply and a load, and this operational approach includes: first, it is provided that an input voltage measurement module, receives this alternating current power supply, and this alternating current power supply of rectification is to produce a DC voltage；And export one first switching signal and a second switch signal (S10).
Then, it is provided that a switches set and a second switch (S20).This input voltage measurement module includes this switches set, a rectification circuit, this voltage detecting circuit and a voltage protection circuit.This switches set connects one end of this alternating current power supply.This rectification circuit connects the other end and this switches set of this alternating current power supply, and to receive this alternating current power supply, and this alternating current power supply of rectification is to produce a DC voltage.This voltage detecting circuit receives this DC voltage, to export a voltage signal.This voltage protection circuit receives this voltage signal, to export this first switching signal and this second switch signal.
Additionally, this input voltage measurement module also includes a main capacitance and an accessory power supply supply circuit.This main capacitance is electrically connected the outfan of this rectification circuit, to receive this DC voltage, and this DC voltage is filtered operation.This accessory power supply supply circuit is electrically connected this main capacitance, with this DC voltage after accepting filter, and changes this DC voltage, to export the DC voltage of different voltage swing, it is provided that the power supply needed for this input voltage measurement inside modules circuit.
When this voltage detecting circuit detects that this DC voltage reaches first overvoltage value, this second switch signal controls this second switch, to block this alternating current power supply to this load supplying (S30).When this voltage detecting circuit detect this DC voltage continue to increase reach second overvoltage value time, this first switching signal controls this switches set, to provide voltage limit and threshold currents protection (S40).
In sum, the present invention at least has the advantage that
1, when this voltage detecting circuit 123 detects that this alternating current power supply Vac is abnormally high-voltage, it is, when DC voltage Vb reaches this first overvoltage value Voth1, directly control this second switch；And when this alternating current power supply Vac continues to increase; namely; when DC voltage Vb reaches this second overvoltage value Voth2; directly control this switches set; to provide voltage limit and threshold currents protection, thus, by directly cutting off outside abnormal voltage, this load 90 of rear end is powered; the pressure grade that can make this resistance 1212 in this switches set 121 is designed to reduce, and then reduces circuit cost and improve the service life of circuit unit；And
2, owing to the performance number of this resistance 1212 can be greatly reduced, therefore, this overvoltage protection 10 of Miniaturizable.
It should be understood that; the above; it is only detailed description and the accompanying drawing of preferred embodiment of the present invention; but inventive feature is not limited thereto; and it is not used to the restriction present invention; all scopes of the present invention should be as the criterion with following application protection domain; the embodiment of all spirit changes similar to it being combined in the present patent application protection domain; all should include in scope of the invention; any those skilled in the art are in the field of the invention, it is possible to the change being readily apparent that or modification all can be encompassed in the protection domain of following this case.
Claims (19)
1. an overvoltage protection, connects an alternating current power supply and a load, it is characterised in that this overvoltage protection includes:
One input voltage measurement module, including:
One switches set, connects one end of this alternating current power supply；
One rectification circuit, connects the other end and this switches set of this alternating current power supply, and to receive this alternating current power supply, and this alternating current power supply of rectification is to produce a DC voltage；
One voltage detecting circuit, receives this DC voltage, to export a voltage signal；
One voltage protection circuit, receives this voltage signal, to export one first switching signal and a second switch signal；And
One second switch, connects this alternating current power supply, this load and this input voltage measurement module；
Wherein, when this voltage detecting circuit detects that this DC voltage reaches first overvoltage value, this second switch signal controls this second switch, to block this alternating current power supply to this load supplying；When this voltage detecting circuit detect this DC voltage continue to increase reach second overvoltage value time, this first switching signal controls this switches set, to provide the protection of voltage limit and threshold currents.
2. overvoltage protection as claimed in claim 1, it is characterised in that this input voltage measurement module also includes:
One main capacitance, is electrically connected the outfan of this rectification circuit, to receive this DC voltage, and this DC voltage is filtered operation；And
One accessory power supply supply circuit, is electrically connected this main capacitance, with this DC voltage after accepting filter, and changes this DC voltage, to export the DC voltage of different voltage swing, it is provided that the power supply needed for this input voltage measurement inside modules circuit.
3. overvoltage protection as claimed in claim 1, it is characterised in that this switches set includes:
One first switch, has one first end, one second end and is held jointly；This first switch this first switching signal produced by this voltage protection circuit is controlled；
One resistance, has one first end and one second end；And
One negative temperature coefficient assembly, has one first end and one second end；
Wherein, this common end of this first switch connects the input of this rectification circuit；This first end of this first switch connects this second end of this negative temperature coefficient assembly, and this second end of this first switch connects this second end of this resistance；This first end of this negative temperature coefficient assembly connects this first end of this resistance, is then then connected to this alternating current power supply.
4. overvoltage protection as claimed in claim 2, it is characterised in that this switches set includes:
One first switch, has one first end, one second end and is held jointly；This first switch this first switching signal produced by this voltage protection circuit is controlled；
One resistance, has one first end and one second end；And
One negative temperature coefficient assembly, has one first end and one second end；
Wherein, this common end of this first switch connects the input of this rectification circuit；This first end of this first switch connects this first end and this alternating current power supply of this resistance, and this second end of this first switch connects this second end of this resistance；This first end of this negative temperature coefficient assembly connects the outfan of this rectification circuit, and this second end of this negative temperature coefficient assembly connects this main capacitance.
5. overvoltage protection as claimed in claim 2, it is characterised in that this switches set includes:
One first switch, has one first end and one second end；This first switch this first switching signal produced by this voltage protection circuit is controlled；
One resistance, has one first end and one second end；And
One negative temperature coefficient assembly, has one first end and one second end；
Wherein, this first end of this first switch connects this second end of this resistance and the input of this rectification circuit, and this second end of this first switch connects this first end and this alternating current power supply of this resistance；This first end of this negative temperature coefficient assembly connects the outfan of this rectification circuit, and this second end of this negative temperature coefficient assembly connects this main capacitance.
6. overvoltage protection as claimed in claim 3; it is characterized in that; when this second overvoltage value set by this DC voltage reaches this input voltage measurement module; this first switching signal switches to this common end of this first switch and this second end conducting of this first switch to control this first switch; make this resistance connect this alternating current power supply and this rectification circuit, and then voltage limit and threshold currents protection are provided.
7. overvoltage protection as claimed in claim 4; it is characterized in that; when this second overvoltage value set by this DC voltage reaches this input voltage measurement module; this first switching signal controls this first switch and switches to this common end of this first switch and this second end conducting of this first switch; make this resistance connect this alternating current power supply and this rectification circuit, and then voltage limit and threshold currents protection are provided.
8. overvoltage protection as claimed in claim 5; it is characterized in that; when this second overvoltage value set by this DC voltage reaches this input voltage measurement module; this first switching signal controls this and first switches off; make this resistance connect this alternating current power supply and this rectification circuit, and then voltage limit and threshold currents protection are provided.
9. overvoltage protection as claimed in claim 1, it is characterised in that including:
One electric fuse unit, is connected in series this electric fuse unit, and this electric fuse unit of this series connection and this second switch are electrically connected between this alternating current power supply and this load；Wherein, when this alternating current power supply is to this load supplying, if this tandem paths powers on when flowing through big, this electric fuse unit disconnects and flows through this load with interruptive current.
10. an operational approach for overvoltage protection, this overvoltage protection connects an alternating current power supply and a load, it is characterised in that this operational approach includes:
A () provides an input voltage measurement module, receive this alternating current power supply, and this alternating current power supply of rectification is to produce a DC voltage；And export one first switching signal and a second switch signal；
B () provides a switches set and a second switch；
C (), when this voltage detecting circuit detects that this DC voltage reaches first overvoltage value, this second switch signal controls this second switch, to block this alternating current power supply to this load supplying；And
(d) when this voltage detecting circuit detect this DC voltage continue to increase reach second overvoltage value time, this first switching signal controls this switches set, to provide the protection of voltage limit and threshold currents.
11. overvoltage protection operational approach as claimed in claim 10, wherein this input voltage measurement module, it is characterised in that including:
This switches set, connects one end of this alternating current power supply；
One rectification circuit, connects the other end and this switches set of this alternating current power supply, and to receive this alternating current power supply, and this alternating current power supply of rectification is to produce a DC voltage；
This voltage detecting circuit, receives this DC voltage, to export a voltage signal；And
One voltage protection circuit, receives this voltage signal, to export this first switching signal and this second switch signal.
12. overvoltage protection operational approach as claimed in claim 11, it is characterised in that this input voltage measurement module also includes:
One main capacitance, is electrically connected the outfan of this rectification circuit, to receive this DC voltage, and this DC voltage is filtered operation；And
One accessory power supply supply circuit, is electrically connected this main capacitance, with this DC voltage after accepting filter, and changes this DC voltage, to export the DC voltage of different voltage swing, it is provided that the power supply needed for this input voltage measurement inside modules circuit.
13. overvoltage protection operational approach as claimed in claim 10, it is characterised in that this switches set includes:
One first switch, has one first end, one second end and is held jointly；This first switch this first switching signal produced by this voltage protection circuit is controlled；
One resistance, has one first end and one second end；And
One negative temperature coefficient assembly, has one first end and one second end；
Wherein, this common end of this first switch connects the input of this rectification circuit；This first end of this first switch connects this second end of this negative temperature coefficient assembly, and this second end of this first switch connects this second end of this resistance；This first end of this negative temperature coefficient assembly connects this first end of this resistance, is then then connected to this alternating current power supply.
14. overvoltage protection operational approach as claimed in claim 12, it is characterised in that this switches set includes:
One first switch, has one first end, one second end and is held jointly；This first switch this first switching signal produced by this voltage protection circuit is controlled；
One resistance, has one first end and one second end；And
One negative temperature coefficient assembly, has one first end and one second end；
Wherein, this common end of this first switch connects the input of this rectification circuit；This first end of this first switch connects this first end and this alternating current power supply of this resistance, and this second end of this first switch connects this second end of this resistance；This first end of this negative temperature coefficient assembly connects the outfan of this rectification circuit, and this second end of this negative temperature coefficient assembly connects this main capacitance.
15. overvoltage protection operational approach as claimed in claim 12, it is characterised in that this switches set includes:
One first switch, has one first end and one second end；This first switch this first switching signal produced by this voltage protection circuit is controlled；
One resistance, has one first end and one second end；And
One negative temperature coefficient assembly, has one first end and one second end；
Wherein, this first end of this first switch connects this second end of this resistance and the input of this rectification circuit, and this second end of this first switch connects this first end and this alternating current power supply of this resistance；This first end of this negative temperature coefficient assembly connects the outfan of this rectification circuit, and this second end of this negative temperature coefficient assembly connects this main capacitance.
16. overvoltage protection operational approach as claimed in claim 13; it is characterized in that; when this second overvoltage value set by this DC voltage reaches this input voltage measurement module; this first switching signal switches to this common end of this first switch and this second end conducting of this first switch to control this first switch; make this resistance connect this alternating current power supply and this rectification circuit, and then voltage limit and threshold currents protection are provided.
17. overvoltage protection operational approach as claimed in claim 14; it is characterized in that; when this second overvoltage value set by this DC voltage reaches this input voltage measurement module; this first switching signal controls this first switch and switches to this common end of this first switch and this second end conducting of this first switch; make this resistance connect this alternating current power supply and this rectification circuit, and then voltage limit and threshold currents protection are provided.
18. overvoltage protection operational approach as claimed in claim 15; it is characterized in that; when this second overvoltage value set by this DC voltage reaches this input voltage measurement module; this first switching signal controls this and first cut-offs out; make this resistance connect this alternating current power supply and this rectification circuit, and then voltage limit and threshold currents protection are provided.
19. overvoltage protection operational approach as claimed in claim 10, it is characterised in that including:
Thering is provided an electric fuse unit, this electric fuse unit is connected in series this electric fuse unit, and this electric fuse unit of this series connection and this second switch are electrically connected between this alternating current power supply and this load；Wherein, when this alternating current power supply is to this load supplying, if this tandem paths powers on when flowing through big, this electric fuse unit disconnects and flows through this load with interruptive current.
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| CN105720554B (en) | 2018-12-11 |
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