CN207926178U - A kind of anti-overvoltage crowbar of low cost input - Google Patents
A kind of anti-overvoltage crowbar of low cost input Download PDFInfo
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- CN207926178U CN207926178U CN201820316317.XU CN201820316317U CN207926178U CN 207926178 U CN207926178 U CN 207926178U CN 201820316317 U CN201820316317 U CN 201820316317U CN 207926178 U CN207926178 U CN 207926178U
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Abstract
The utility model discloses a kind of low costs to input anti-overvoltage crowbar, can monitor AC-input voltage size in real time, and control switching device break-make in chopper circuit by control circuit.When AC-input voltage increases extremely; control circuit, which can detect rapidly and control switching device in chopper circuit, is on off state; maintain storage capacitor voltage not excessively high; to fast and effeciently protect late-class circuit; prevent storage capacitor and switching tube in late-class circuit from being damaged because of overtension, and late-class circuit can continue to work normally.Compared with the existing technology, the anti-overvoltage crowbar of the utility model, suitable for being likely to occur the situation and occasion that earth fault etc. causes network voltage extremely over-pressed; reaction speed is fast, and circuit is simple and reliable, at low cost; EMC superior performances, flexible design, adjustable protective threshold values.
Description
Technical field
The utility model is related to circuit fields, specifically, being related to a kind of for three-phase and four-line and feed automation power supply
The anti-overvoltage crowbar of input in system.
Background technology
In three-phase and four-line power electric meter and feed automation industry Switching Power Supply, earth fault and big can be usually encountered
The problems such as power apparatus interferes, causes network voltage in a period of time extremely higher, network voltage can be more than Switching Power Supply at this time
The upper voltage limit that can bear easily causes Switching Power Supply damage even on fire, and there are huge security risks.
It is defeated one is increasing there are mainly two types of existing Switching Power Supply solves the problems, such as that the higher method of network voltage is summed up
Enter overvoltage crowbar, another kind is the operating voltage range upper limit that improves power supply and can bear.Wherein, increase on input voltage
Limit mainly uses high voltage device or multistage series-parallel system, and circuit remains to work normally when advantage is overvoltage, the disadvantage is that electric
Road cost and volume increase, and upper limit of input voltage often doubles, and storage capacitor cost about rises four times, switching tube cost about on
Rise twice or more, and the over-pressed working time is very short, there are serious cross to design for this method, very waste of resource；Another method is
Increase protection circuit against input over-voltage makes control chip be stopped when detecting that network voltage is excessively high, and this mode can only be used
In the smaller situation of overvoltage, and when network voltage it is higher to original 1.5 times or more when, rectified voltage has been more than that bulky capacitor is resistance to
Pressure even switching tube pressure resistance, is stopped when substantially only over-pressed, can not protect late-class circuit.
In three-phase and four-line power electric meter and feed automation industry, nowadays only have a small number of Switching Power Supplies to have on the market anti-
Earth fault and input over-voltage protecting function, electrolytic capacitor and switching tube are all often that ultra-specification is firmly anti-when over-pressed, and there are huge
Security risk.Therefore, it is necessary to be improved to the prior art, design is a kind of in higher to original twice extremely of network voltage
When, it also can securely and reliably protect the anti-overvoltage crowbar of low cost that late-class circuit persistently works normally.
Utility model content
In view of this, in order to solve the above-mentioned technical problem, the utility model provide it is a kind of realized by chopping way it is new
Type protection circuit against input over-voltage.Input voltage is typically all AC sine signal, and absolute value of voltage in one cycle can be from most
Small value changes to maximum value, and chopper circuit can be when input ac voltage absolute value be higher, by late-class circuit and energy storage bulky capacitor
It disconnects, late-class circuit is maintained into certain voltage hereinafter, late-class circuit can work normally when over-pressed.This circuit can be in ground connection event
Protective efficient switch power supply when the factors such as barrier cause voltage drift high, and cost is very low.
The purpose of this utility model is achieved through the following technical solutions, a kind of anti-overvoltage protection electricity of low cost input
Road, including：Input chopper circuit and control circuit two parts circuit.As shown in Figure 1.
A kind of anti-overvoltage crowbar of low cost input, including input chopper circuit and control circuit two parts circuit；
The output end for inputting the external EMC filter circuit of input terminal connection of chopper circuit, inputs the output end of chopper circuit
It powers for late-class circuit；
Control circuit acquires the alternating voltage of external EMC filter circuit output in real time, when alternating voltage absolute value is more than
When setting threshold values, output control signal Vg control input chopper circuits disconnect, and input on the storage capacitor in chopper circuit at this time
Voltage will not be further continued for rising, by storage capacitor be late-class circuit power；
When alternating voltage absolute value is less than given threshold, output control signal Vg control input chopper circuit conductings are
Storage capacitor charges, and maintains the voltage of storage capacitor, is equally powered for late-class circuit by storage capacitor.
Preferably, the input chopper circuit, including capacitance C801, rectifier bridge DB801, capacitance C802, switching device
And storage capacitor；Input terminal of the both ends the capacitance C801 as input chopper circuit, capacitance C802 are connected in parallel on storage capacitor
Both ends；The both ends of storage capacitor power for late-class circuit；
The connection relation of the switching device and rectifier bridge DB801 are one of following four mode：
The first input end of rectifier bridge DB801 and the second input terminal are connected respectively to the both ends of capacitance C801, rectifier bridge
The anode of the anode connection storage capacitor of DB801；The switching device is connected to the cathode and energy storage electricity of rectifier bridge DB801
Between the cathode of appearance, the control terminal connection control signal Vg of the switching device；
The first input end of rectifier bridge DB801 and the second input terminal are connected respectively to the both ends of capacitance C801, rectifier bridge
The cathode of the cathode connection storage capacitor of DB801；The switching device is connected to the anode and energy storage electricity of rectifier bridge DB801
Between the anode of appearance, the control terminal connection control signal Vg of the switching device；
Switching device is connected between one end of capacitance C801 and the first input end of rectifier bridge DB801, rectifier bridge DB801
The second input terminal connection capacitance C801 the other end, the anode and cathode of rectifier bridge DB801 are being separately connected storage capacitor just
Pole and cathode；The control terminal connection control signal Vg of the switching device；
Switching device is connected between the other end of capacitance C801 and the second input terminal of rectifier bridge DB801, rectifier bridge
One end of the first input end connection capacitance C801 of DB801, the anode and cathode of rectifier bridge DB801 are separately connected storage capacitor
Anode and cathode；The control terminal connection control signal Vg of the switching device；
The AC signal at the both ends capacitance C801 is respectively Vac_L and Vac_N, and Vac_L and Vac_N are transferred to control
Circuit processed is handled；The cathode of rectifier bridge DB801 exports Vs signals, and as the signal ground of control circuit, storage capacitor is just
Pole exports Vc signals, and circuit is powered in order to control；Control circuit output control signal Vg is connected to the control terminal of switching device, control
Switching device turns on and off.
Preferably, the switching device includes N-type channel metal-oxide-semiconductor TR808 and varistor RV803, the pressure-sensitive electricity
Resistance RV803 is connected in parallel between the source electrode and drain electrode of N-type channel metal-oxide-semiconductor TR808, and the source electrode connection of N-type channel metal-oxide-semiconductor TR808 is whole
Flow the cathode of bridge DB801, the cathode of the drain electrode connection storage capacitor of N-type channel metal-oxide-semiconductor TR808, N-type channel metal-oxide-semiconductor TR808
Control terminal of the grid as switching device.
Preferably, the switching device includes P-type channel metal-oxide-semiconductor TR809 and varistor RV803, varistor
The both ends of RV803 are connected in parallel between the source electrode and drain electrode of P-type channel metal-oxide-semiconductor TR809, and the source electrode of P-type channel metal-oxide-semiconductor TR809 connects
Connect the anode of rectifier bridge DB801, the anode of the drain electrode connection storage capacitor of P-type channel metal-oxide-semiconductor TR809；P-type channel metal-oxide-semiconductor
Control terminal of the grid of TR809 as switching device.
Preferably, the switching device includes relay TR810 and varistor RV803, the relay TR810's
Control terminal of first control terminal as switching device, the second control terminal of the relay TR810 connect whole with first switch end
Flow the cathode of bridge DB801, the cathode of the second switch end connection storage capacitor of the relay TR810；Varistor RV803
Both ends be separately connected first switch end and the second switch end of relay TR810.
Preferably, the switching device includes relay TR810 and varistor RV803, the relay TR810's
Control terminal of first control terminal as switching device, the second control terminal connection rectifier bridge DB801's of the relay TR810 is negative
Pole, the anode of the first switch end connection rectifier bridge DB801 of the relay TR810, the second switch of the relay TR810
The anode of end connection storage capacitor；The both ends of varistor RV803 are separately connected the first switch end and second of relay TR810
Switch terminals.
Preferably, the switching device includes relay TR810, the first control terminal conduct of the relay TR810
The control terminal of switching device, the cathode of the second control terminal connection rectifier bridge DB801 of the relay TR810, the relay
The second switch end of first switch end connection the AC signal Vac_L, the relay TR810 of TR810 connect rectifier bridge
The first input end of DB801.
Preferably, the switching device includes relay TR810, the first control terminal conduct of the relay TR810
The control terminal of switching device, the cathode of the second control terminal connection rectifier bridge DB801 of the relay TR810, the relay
The second switch end of first switch end connection the AC signal Vac_N, the relay TR810 of TR810 connect rectifier bridge
The second input terminal of DB801.
Preferably, the control circuit, including input voltage measurement and return difference circuit, stable power-supplying circuit, control core
Piece U801, voltage-stabiliser tube diode D806, zener diode D807, capacitance C811 and resistance R807；The input voltage measurement
Include resistance R808, resistance R809, resistance R812, resistance R813, resistance R814, triode Q801, voltage stabilizing two with return difference circuit
Pole pipe D808 and capacitance C812；The stable power-supplying circuit includes resistance R802, resistance R803, resistance R806, diode
D805 and capacitance C810；
The anode of the described Vc signals connection diode D805, the cathode of diode D805 successively with resistance R802, capacitance
The signal ground of connection control circuit after C810 series connection；The series connection node of one end connection the resistance R802 and capacitance C810 of resistance R803,
The cathode of the output end and zener diode D806 of the other end connection control chip U801 of resistance R803, zener diode
The signal ground of the anode connection control circuit of D806；Resistance R806 is connected between the cathode and anode of zener diode D806；
The cathode of one end and zener diode D807 of the sampling end connection capacitance C811 of chip U801 is controlled, control chip U801's
The anode of ground terminal, the other end of capacitance C811 and zener diode D807 connects the signal ground of control circuit jointly；Resistance
The output end of one end connection control chip U801 of R807, the cathode of the other end connection zener diode D808 of resistance R807；
One end of resistance R808 and one end of resistance R809 are separately connected the AC signal Vzc_N of two input terminals of rectifier bridge DB801
With Vac_L；The other end of resistance R808, the other end of resistance R809, one end of resistance R813, resistance R812 one end connect simultaneously
Connect the cathode of zener diode D807, the signal ground of the other end connection control circuit of resistance R812, the other end of resistance R813
The collector of connecting triode Q801；The signal ground of the emitter connection control circuit of triode Q801, the base stage of triode Q801
It is separately connected the anode of one end of resistance R814, one end and zener diode D808 of capacitance C812；The other end of resistance R814
The signal ground of control circuit is connected with the other end of capacitance C812.
Preferably, control chip U801 is replaced with a sampling comparison circuit, the sampling comparison circuit includes operation
Amplifier U1, triode Q1, diode D1 and constant pressure source VREF；The in-phase input end of the operational amplifier U1 connects capacitance
One end of C811, the inverting input connection constant pressure source V of operational amplifier U1REFAnode, the negative supply of operational amplifier U1
End and constant pressure source VREFNegative terminal connection control circuit signal ground, operational amplifier U1 positive power source terminal output control signal Vg,
The base stage of the output end connecting triode Q1 of operational amplifier U1, the negative electricity of the emitter connection operational amplifier U1 of triode Q1
The anode of source and diode D1, the positive supply of the cathode and operational amplifier U1 of the collector connection diode D1 of triode Q1
End.
Compared with prior art, the utility model has the advantages that：
1) this programme solves the problems, such as that existing earth fault causes Switching Power Supply to be damaged；
2) when inputting overvoltage, late-class circuit remains to work normally this programme；
3) this programme control circuit carries stable power-supplying circuit, powers without additional power supply；
4) this programme circuit is simple and reliable, at low cost；
5) the utility model flexible design, overvoltage protection threshold are adjustable；
6) the utility model possesses unique EMC optimizations circuit, EMC superior performances.
Description of the drawings
Fig. 1 is the application block diagram that the utility model inputs anti-overvoltage crowbar；
Fig. 2 is that the utility model first embodiment inputs anti-overvoltage crowbar schematic diagram (input chop section)；
Fig. 3 is that the utility model first embodiment inputs anti-overvoltage crowbar schematic diagram (control circuit part)；
Fig. 4 is the schematic diagram of the input chopper circuit of the utility model second embodiment；
Fig. 5 is the schematic diagram one of the input chopper circuit of the utility model 3rd embodiment；
Fig. 6 is the schematic diagram two of the input chopper circuit of the utility model 3rd embodiment；
Fig. 7 is the schematic diagram three of the input chopper circuit of the utility model 3rd embodiment；
Fig. 8 is the schematic diagram four of the input chopper circuit of the utility model 3rd embodiment；
Fig. 9 is the schematic diagram that comparison circuit is used in the utility model fourth embodiment.
Specific embodiment
First embodiment
Fig. 2 is the schematic diagram that the utility model first embodiment inputs chopper circuit, including：Capacitance C801, rectifier bridge
DB801, capacitance C802, varistor RV803, N-type channel metal-oxide-semiconductor TR808 and storage capacitor C805.
The Vds suggestions 650V or more of capacitance C801 and C802 selection safety capacitance, N-type channel metal-oxide-semiconductor TR808.
The EMC filter circuit L and N-terminal of the both ends safety capacitance C801 connection front end, and it is connected respectively to rectifier bridge
Two ac input ends of DB801：First input end and the second input terminal, metal-oxide-semiconductor TR808 source electrodes (S) are connected to rectifier bridge
DB801 cathode, TR808 drain electrodes (D) are connected to storage capacitor C805 cathode, and are connected with one end of RV803 and C802, pressure-sensitive electricity
Hinder the source electrode (S) of the other end connection metal-oxide-semiconductor TR808 of RV803, the safety capacitance C802 other ends and storage capacitor C805 anodes
It is connected with rectification DB801 anodes, the control signal Vg of the output end of the grid connection control circuit of TR808.Storage capacitor C805
Both ends be late-class circuit power supply.
Safety capacitance C801 and varistor RV803 can improve the reliability and EMC performances of input chopper circuit, wherein
Safety capacitance C801 generally chooses the X capacitances of 0.1uF, act as：When TR808 is rapidly switched off, EMC filter circuit is filtered out with before
The perceptual dash current for holding power grid prevents rectifier bridge DB801 and metal-oxide-semiconductor TR808 damages.If input voltage exchanges for 220Vac
Electricity, 2 times of overvoltages are 440Vac, and varistor RV803 can choose the varistor of 470V, it acts as：Surge or high pressure interference
When, metal-oxide-semiconductor TR808 can be turned off, and overtension, pressure-sensitive RV803 can prevent metal-oxide-semiconductor between TR808 source electrodes (S) and drain electrode (D) at this time
TR808 is damaged because of surge impact, improves circuit anti-lightning surge capacity.
Fig. 3 be the utility model first embodiment control circuit schematic diagram, wherein dotted line frame A be input voltage measurement and
Return difference partial circuit, dotted line frame B are stable power-supplying circuits, and control circuit includes：Input voltage measurement and return difference circuit stablize confession
Circuit, control chip U801, voltage-stabiliser tube diode D806 and D807, capacitance C811 and resistance R807.
Wherein input voltage measurement and return difference circuit include resistance R808, R809, R812, R813, R814, triode
Q801, zener diode D808 and capacitance C812；
Wherein stable power-supplying circuit includes resistance R802, R803, R806, diode D805 and capacitance C810.
Input chop section circuit, which shares, to be connected at 5 with control circuit, as shown in Figures 2 and 3, wherein Vac_L and Vac_N
It is the AC signal for two input terminals for acquiring rectifier bridge DB801, and is transferred to control circuit and is handled.Rectifier bridge DB801
Cathode export Vs signals, as the signal ground of control circuit, the anode output Vc signals of rectifier bridge DB801, circuit in order to control
Power supply.The grid of control chip U810 output control signals Vg to TR808 in control circuit, controls opening and closing for TR808
It is disconnected.
The anode of the Vc signals connection diode D805, the cathode of D805 are gone here and there with resistance R802, capacitance C810 successively
The signal ground of connection control circuit after connection；The series connection node of one end connection R802 and C810 of R803, the other end connection control of R803
The cathode of the output end and D806 of coremaking piece U801, the signal ground of the anode connection control circuit of D806；Resistance R806 is connected to
Between the cathode and anode of D806；The cathode of one end and D807 of the sampling end connection capacitance C811 of U801, the ground terminal of U801,
The other end of C811 and the anode of D807 connect the signal ground of control circuit jointly；One end connection U801's of resistance R807 is defeated
Outlet, the cathode of the other end connection D808 of R807；One end of R808 and one end of R809 are separately connected rectifier bridge DB801's
The AC signal Vzc_N and Vac_L of two input terminals reconnect D807's after the other end of the other end connection R809 of R808
Cathode；The cathode of D807, the letter of the other end connection control circuit of R812 are reconnected behind one end of one end connection R812 of R813
Number ground, the collector of the other end connection Q801 of R813；The signal ground of the emitter connection control circuit of Q801, the base stage point of Q801
Not Lian Jie resistance R814 one end, one end of capacitance C812 and the anode of D808；The other end of R814 and capacitance C812's is another
The signal ground of end connection control circuit.
Control circuit operation principle：Input voltage measurement and return difference circuit are given to U801 after being depressured input exchange signal and adopt
Sample end, U801 are the TL431 of 2.5V, and when overvoltage occurs in input AC electricity, U801 samples terminal voltage and is higher than 2.5V, the ends Vg electricity
Pressure drop is low, and Q801 is caused to become ending from conducting, further promotes U801 sampling terminal voltages to rise, makes Vg rapid decreases, improve
The turn-off speed of metal-oxide-semiconductor TR808.Since there are return differences, when input voltage drops to voltage more lower than pressure point excessively, U801
It samples terminal voltage and is less than 2.5V, Vg voltages slowly rise, and metal-oxide-semiconductor TR808 is just again open-minded, defeated when being opened due to metal-oxide-semiconductor TR808
Entering alternating voltage, absolute value is lower than storage capacitor voltage at this time, therefore flows through metal-oxide-semiconductor almost without electric current when opening, therefore return difference is electric
Road is in addition to stabilization, moreover it is possible to play the role of reducing metal-oxide-semiconductor switch-on damage.
In input voltage measurement and return difference circuit such as Fig. 3 shown in dotted line frame A.R808, R809, R812, R13 composition partial pressure electricity
The threshold voltage of its resistance value setting overvoltage protection is adjusted in road, wherein it is big that change R813 and R812 can also adjust hysteresis voltage
It is small.Metal-oxide-semiconductor turn-off speed can be improved in voltage-stabiliser tube D808, generally takes 9.1V.NPN triode Q801 and resistance R813R812 compositions
Return difference circuit.R814 and C812 is used to filter Q801, and C811 is used to filter U801 sampling ends, prevents from interfering.Two pole of voltage stabilizing
Pipe D807 generally takes 5.1V, can prevent surge or disturbing pulse from damaging U801.
In stable power-supplying circuit such as Fig. 3 shown in dotted line frame B.Diode D805, resistance R802 and high voltage thin film capacitance C810,
It quivers to the high pressure after rectifier bridge and carries out rectifying and wave-filtering, and store energy in capacitance C810, then pass through current-limiting resistance R803
Stable supply voltage is obtained with voltage-stabiliser tube D806, wherein it is 500K Ω or so that voltage-stabiliser tube D806, which takes 15V or so, R803, is reduced
Metal-oxide-semiconductor switching speed, which can be improved, in R803 resistance values reduces metal-oxide-semiconductor loss fever, but can increase the loss of control circuit.R806 is to let out
Electric discharge resistance, has released control circuit energy when standby, prevents metal-oxide-semiconductor before powering in the conduction state, can be according to environmental disturbances
Situation adjusts R806 sizes.
Cost analysis：After increasing anti-overvoltage crowbar, increased device has, metal-oxide-semiconductor TR808, X capacitance C801, pressure-sensitive
Resistance RV803 and entire control circuit.In addition to metal-oxide-semiconductor TR808, other devices cost is not high, adds up to and is no more than 2 yuan,
Metal-oxide-semiconductor TR808 type selectings need as the case may be, and general 100W or less Switching Power Supplies choose MOS pipes within 2.5 yuan, therefore
Cost is relatively low.Therefore, the utility model circuit has high product practical and commercial value.
When network voltage is normal, metal-oxide-semiconductor TR808 is constantly in conducting state, and conduction impedance very little, calorific value is small, and
Also small (can accomplish within 0.1W) is lost in control circuit, has little influence on Switching Power Supply overall efficiency.When network voltage rises extremely
When height is to original 2 times, metal-oxide-semiconductor TR808 is on off state, and calorific value is risen, and need to choose suitable MOS according to power consumption
Pipe.
Second embodiment
Fig. 4 is the schematic diagram that chopper circuit is inputted in the utility model second embodiment, different from the first embodiment,
N type channel MOS tubes TR808 is changed to P-type channel metal-oxide-semiconductor TR809, and adjusts connection relation and is：The grid connection control of TR809
The anode of the source electrode connection rectifier bridge DB801 of control the signal Vg, TR809 of circuit output processed, the drain electrode connection energy storage electricity of TR809
Hold the anode of C805.The both ends of RV803 are connected in parallel between the source electrode and drain electrode of TR809.The connection relation of other components is constant.
Meanwhile control circuit carries out suitably adjustment and isolation processing.
After adjustment the operation principle of circuit as first embodiment, it can be achieved that equivalent efficacy.
3rd embodiment
Fig. 5 to Fig. 8 is the schematic diagram that chopper circuit is inputted in the utility model 3rd embodiment, is different from the first embodiment
, metal-oxide-semiconductor TR808 is changed to relay TR810, the connection type of relay is one of following four：
The first：The control signal Vg of the first control terminal connection control circuit output of relay, the second control of relay
The signal ground of connection control circuit in end processed, the cathode of the first switch end connection rectifier bridge DB801 of relay, the second of relay
Switch terminals connect the cathode of storage capacitor C805；The both ends of RV803 are separately connected first switch end and the second switch of relay
End.
Second：The control signal Vg of the first control terminal connection control circuit output of relay, the second control of relay
The signal ground of connection control circuit in end processed, the anode of the first switch end connection rectifier bridge DB801 of relay, the second of relay
Switch terminals connect the anode of storage capacitor C805；The both ends of RV803 are separately connected first switch end and the second switch of relay
End.
The third：The control signal Vg of the first control terminal connection control circuit output of relay, the second control of relay
The signal ground of connection control circuit in end processed, the N-terminal of the EMC filter circuit of the first switch end connection front end of relay, relay
Second switch end connection rectifier bridge DB801 the second input terminal.
4th kind：The control signal Vg of the first control terminal connection control circuit output of relay, the second control of relay
The signal ground of connection control circuit in end processed, the ends L of the EMC filter circuit of the first switch end connection front end of relay, relay
Second switch end connection rectifier bridge DB801 first input end.
As first embodiment, purpose is provided to realize big in input ac voltage the operation principle of circuit after adjustment
When the threshold value of setting, the switching device in input chopper circuit is disconnected, stops charging for storage capacitor.Same work(can be achieved
Effect.
Fourth embodiment
Unlike any of the above embodiment, chip U801 (TL431) is replaced with by operational amplifier U1, three
Pole pipe Q1, diode D1 and constant pressure source VREFThe sampling comparison circuit of composition, is shown in attached drawing 9.
One end of the in-phase input end connection capacitance C811 of U1, the inverting input connection constant pressure source V of U1REFAnode, U1
Negative power end and constant pressure source VREFNegative terminal connection control circuit signal ground, the positive power source terminal output control signal Vg, U1 of U1
Output end connecting triode Q1 base stage, the negative power end and diode of the emitter connection operational amplifier U1 of triode Q1
The anode of D1, the positive power source terminal of the cathode and operational amplifier U1 of the collector connection diode D1 of triode Q1.
After adjustment the operation principle of circuit as above example, it can be achieved that equivalent efficacy.
Disclosed above is only the preferred embodiment of the utility model, but the utility model is not limited to this, any
If the dry finishing that those skilled in the art carries out the utility model under the premise of without departing from the core concept of the utility model
Decorations should fall the protection domain etc in the utility model claims.The scope of protection of the utility model is with claims
Content subject to.
Claims (10)
1. a kind of low cost inputs anti-overvoltage crowbar, it is characterised in that：Including input chopper circuit and control circuit two
Parallel circuit；
The output end for inputting the external EMC filter circuit of input terminal connection of chopper circuit, after the output end for inputting chopper circuit is
Grade circuit power supply；
Control circuit acquires the alternating voltage of external EMC filter circuit output in real time, when alternating voltage absolute value is more than setting
When threshold values, output control signal Vg control input chopper circuits disconnect, and input the electricity on the storage capacitor in chopper circuit at this time
Pressure will not be further continued for rising, and be powered for late-class circuit by storage capacitor；
When alternating voltage absolute value is less than setting threshold values, output control signal Vg control input chopper circuit conductings, are energy storage
Capacitor charging maintains the voltage of storage capacitor, is equally powered for late-class circuit by storage capacitor.
2. low cost according to claim 1 inputs anti-overvoltage crowbar, it is characterised in that：The input copped wave electricity
Road, including capacitance C801, rectifier bridge DB801, capacitance C802, switching device and storage capacitor；Capacitance C801 both ends conducts
The input terminal of chopper circuit is inputted, capacitance C802 is connected in parallel on the both ends of storage capacitor；The both ends of storage capacitor supply for late-class circuit
Electricity；
The connection relation of the switching device and rectifier bridge DB801 are one of following four mode：
The first input end of rectifier bridge DB801 and the second input terminal are connected respectively to the both ends of capacitance C801, rectifier bridge DB801's
The anode of anode connection storage capacitor；The switching device is connected to the cathode of rectifier bridge DB801 and the cathode of storage capacitor
Between, the control terminal connection control signal Vg of the switching device；
The first input end of rectifier bridge DB801 and the second input terminal are connected respectively to the both ends of capacitance C801, rectifier bridge DB801's
Cathode connects the cathode of storage capacitor；The switching device is connected to the anode of rectifier bridge DB801 and the anode of storage capacitor
Between, the control terminal connection control signal Vg of the switching device；
Switching device is connected between one end of capacitance C801 and the first input end of rectifier bridge DB801, and the of rectifier bridge DB801
Two input terminals connect the other end of capacitance C801, the anode and cathode of rectifier bridge DB801 be separately connected storage capacitor anode and
Cathode；The control terminal connection control signal Vg of the switching device；
Switching device is connected between the other end of capacitance C801 and the second input terminal of rectifier bridge DB801, rectifier bridge DB801's
First input end connects one end of capacitance C801, the anode and cathode of rectifier bridge DB801 be separately connected storage capacitor anode and
Cathode；The control terminal connection control signal Vg of the switching device；
The AC signal at the both ends capacitance C801 is respectively Vac_L and Vac_N, and Vac_L and Vac_N are transferred to control electricity
Road is handled；The cathode of rectifier bridge DB801 exports Vs signals, and as the signal ground of control circuit, the anode of storage capacitor is defeated
Go out Vc signals, circuit is powered in order to control；Control circuit output control signal Vg is connected to the control terminal of switching device, control switch
Device turns on and off.
3. low cost according to claim 2 inputs anti-overvoltage crowbar, it is characterised in that：The switching device packet
It includes N-type channel metal-oxide-semiconductor TR808 and varistor RV803, the varistor RV803 is connected in parallel on N-type channel metal-oxide-semiconductor TR808's
Between source electrode and drain electrode, the cathode of the source electrode connection rectifier bridge DB801 of N-type channel metal-oxide-semiconductor TR808, N-type channel metal-oxide-semiconductor TR808
Drain electrode connection storage capacitor cathode, the control terminal of the grid of N-type channel metal-oxide-semiconductor TR808 as switching device.
4. low cost according to claim 2 inputs anti-overvoltage crowbar, it is characterised in that：The switching device packet
P-type channel metal-oxide-semiconductor TR809 and varistor RV803 are included, the both ends of varistor RV803 are connected in parallel on P-type channel metal-oxide-semiconductor TR809
Source electrode and drain electrode between, the anode of the source electrode of P-type channel metal-oxide-semiconductor TR809 connection rectifier bridge DB801, P-type channel metal-oxide-semiconductor
The anode of the drain electrode connection storage capacitor of TR809；Control terminal of the grid of P-type channel metal-oxide-semiconductor TR809 as switching device.
5. low cost according to claim 2 inputs anti-overvoltage crowbar, it is characterised in that：The switching device packet
Control terminal of the first control terminal of relay TR810 and varistor RV803, the relay TR810 as switching device is included,
The second control terminal of the relay TR810 connects the cathode of rectifier bridge DB801, the relay TR810 with first switch end
Second switch end connection storage capacitor cathode；What the both ends of varistor RV803 were separately connected relay TR810 first opens
Guan Duan and second switch end.
6. low cost according to claim 2 inputs anti-overvoltage crowbar, it is characterised in that：The switching device packet
Control terminal of the first control terminal of relay TR810 and varistor RV803, the relay TR810 as switching device is included,
The cathode of the second control terminal connection rectifier bridge DB801 of the relay TR810, the first switch end of the relay TR810
Connect the anode of rectifier bridge DB801, the anode of the second switch end connection storage capacitor of the relay TR810；Varistor
The both ends of RV803 are separately connected first switch end and the second switch end of relay TR810.
7. low cost according to claim 2 inputs anti-overvoltage crowbar, it is characterised in that：The switching device packet
Include control terminal of the first control terminal of relay TR810, the relay TR810 as switching device, the relay TR810
The second control terminal connection rectifier bridge DB801 cathode, the first switch end connection AC signal Vac_ of the relay TR810
The first input end of the second switch end connection rectifier bridge DB801 of L, the relay TR810.
8. low cost according to claim 2 inputs anti-overvoltage crowbar, it is characterised in that：The switching device packet
Include control terminal of the first control terminal of relay TR810, the relay TR810 as switching device, the relay TR810
The second control terminal connection rectifier bridge DB801 cathode, the first switch end connection AC signal Vac_ of the relay TR810
The second input terminal of the second switch end connection rectifier bridge DB801 of N, the relay TR810.
9. the low cost according to claim 3 to 8 any one inputs anti-overvoltage crowbar, it is characterised in that：It is described
Control circuit, including input voltage measurement and return difference circuit, stable power-supplying circuit, control chip U801, voltage-stabiliser tube diode
D806, zener diode D807, capacitance C811 and resistance R807；The input voltage measurement and return difference circuit includes resistance
R808, resistance R809, resistance R812, resistance R813, resistance R814, triode Q801, zener diode D808 and capacitance C812；
The stable power-supplying circuit includes resistance R802, resistance R803, resistance R806, diode D805 and capacitance C810；
The anode of the described Vc signals connection diode D805, the cathode of diode D805 successively with resistance R802, capacitance C810
The signal ground of connection control circuit after series connection；The series connection node of one end connection the resistance R802 and capacitance C810 of resistance R803, resistance
The cathode of the output end and zener diode D806 of the other end connection control chip U801 of R803, zener diode D806 is just
Pole connects the signal ground of control circuit；Resistance R806 is connected between the cathode and anode of zener diode D806；Control chip
The cathode of one end and zener diode D807 of the sampling end connection capacitance C811 of U801, ground terminal, the electricity of control chip U801
The anode of the other end and zener diode D807 that hold C811 connects the signal ground of control circuit jointly；One end of resistance R807 connects
Connect the output end of control chip U801, the cathode of the other end connection zener diode D808 of resistance R807；The one of resistance R808
End and one end of resistance R809 are separately connected the AC signal Vzc_N and Vac_L of two input terminals of rectifier bridge DB801；Resistance
The other end of R808, the other end of resistance R809, one end of resistance R813, resistance R812 one end simultaneously connect zener diode
The cathode of D807, the signal ground of the other end connection control circuit of resistance R812, the other end connecting triode of resistance R813
The collector of Q801；The signal ground of the emitter connection control circuit of triode Q801, the base stage of triode Q801 are separately connected electricity
Hinder the anode of one end of R814, one end and zener diode D808 of capacitance C812；The other end and capacitance C812 of resistance R814
The other end connection control circuit signal ground.
10. low cost according to claim 9 inputs anti-overvoltage crowbar, it is characterised in that：Compared with a sampling
Circuit replaces control chip U801, and the sampling comparison circuit includes operational amplifier U1, triode Q1, diode D1 and perseverance
Potential source VREF；One end of the in-phase input end connection capacitance C811 of the operational amplifier U1, the reverse phase of operational amplifier U1 are defeated
Enter end connection constant pressure source VREFAnode, the negative power end and constant pressure source V of operational amplifier U1REFNegative terminal connection control circuit
Signal ground, positive power source terminal output control the signal Vg, the output end connecting triode Q1 of operational amplifier U1 of operational amplifier U1
Base stage, the anode of the negative power end and diode D1 of the emitter connection operational amplifier U1 of triode Q1, triode Q1's
Collector connects the positive power source terminal of the cathode and operational amplifier U1 of diode D1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820316317.XU CN207926178U (en) | 2018-03-08 | 2018-03-08 | A kind of anti-overvoltage crowbar of low cost input |
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| CN201820316317.XU CN207926178U (en) | 2018-03-08 | 2018-03-08 | A kind of anti-overvoltage crowbar of low cost input |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206517A (en) * | 2018-03-08 | 2018-06-26 | 广州金升阳科技有限公司 | A kind of low cost inputs anti-overvoltage crowbar |
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- 2018-03-08 CN CN201820316317.XU patent/CN207926178U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206517A (en) * | 2018-03-08 | 2018-06-26 | 广州金升阳科技有限公司 | A kind of low cost inputs anti-overvoltage crowbar |
| WO2019169904A1 (en) * | 2018-03-08 | 2019-09-12 | 广州金升阳科技有限公司 | Low-cost input anti-overvoltage protection circuit |
| CN108206517B (en) * | 2018-03-08 | 2020-05-19 | 广州金升阳科技有限公司 | Low-cost input overvoltage-resistant protection circuit |
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