CN206250763U - The low residual voltage surge protecting circuit of connection in series-parallel automatic conversion - Google Patents
The low residual voltage surge protecting circuit of connection in series-parallel automatic conversion Download PDFInfo
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Abstract
A kind of low residual voltage surge protecting circuit of connection in series-parallel automatic conversion, it is that three element A, B, C series connection, three elements A, B, C described in it can be respectively that it states circuit：（1）, three series connection element A, B, C be the piezoresistor of same characteristic.（2）, three series connection element A, B, C be two ends element A, C be same characteristic piezoresistor, intermediary element B is linear resistance or inductively or capacitively element.（3）, three series connection element A, B, C be two ends element A, C be same characteristic piezoresistor, middle element B is the piezoresistor with element A, C different qualities at two ends.Voltage switch characteristics element is respectively parallel with element A, B of element A, B, C composition series circuit and element B, C tandem compound two ends.This technology can significantly reduce the surge protecting circuit of residual voltage.
Description
Technical field
The utility model is related to electronic technology field, and in particular to a kind of low residual voltage surge protection electricity of connection in series-parallel automatic conversion
Road.
Background technology
The survival of modern electronic product be unable to do without electromagnetic environment protection, SPD（Surge protector）It is electromagnetic environment protection
Elemental device.The basic function of SPD is to suppress surge voltage, shunts surge current.When attenuating surge current is poured in as far as possible,
The voltage (or " limitation voltage ", " residual voltage ") at SPD two ends, is the eternal effort target of SPD technologies.From the angle of Technological Economy
See, the low residual voltage of SPD, at least beneficial effect in terms of three below:
(1) the proof voltage grade reduction of protected device, cost declines；
(2) the air gap of protector installation position can lower, and creep age distance reduces, and proof voltage grade declines；
(3), due to both the above reason, " miniaturization " is easily realized.
Therefore, this device price in itself may be made to increase although reducing SPD residual voltages, under the total cost of circuit system
That drops is more.
In zinc oxide varistor（MOV）Into the early stage in market, 220（240）In V power frequency supply circuits,
It is pressure sensitive voltage（Un）The device of 470V, its residual voltage under nominal discharge current（Limitation voltage）Generally 1100V.But they
Using live on fire, the accident of serious consequence is caused to happen occasionally, then, the specification of MOV used steps up Un=
620V、680V.This measure is effective, greatly reduces the probability of fire accident, but residual voltage correspondingly brings up to
1400V, 1500V, this makes added cost, and volume increases.From in terms of technical standpoint, MOV is connected in parallel on power supply, its performance degradation
Speed is with " k is compared in pressurizationap”（Supply voltage peak value is for the ratio between pressure sensitive voltage）Into positive correlation, pressure sensitive voltage is improved, just reduced
kap, as a result life-span lengthening.
To lower fire probabilities of the MOV under continuous voltage, another current way is with " piezoresistor+gas
Body discharge tube " (" MOV+GDT ") tandem compound replaces single MOV.Such GDT is waiting working condition, and MOV is not subject to
Continuous system voltage, also with regard to the deterioration problem caused without continuous system voltage stress, and caused by the further development of deterioration
Fire accident.This is the advantage of " MOV+GDT " for single MOV, but also has its shortcoming, is exactly that protective value is deteriorated.Because
The impact flashover voltage of GDT is higher, generally in 1000V or so, therefore does not suppress to make for the burst pulse less than this numerical value
With, and any pulse surges of the single MOV for amplitude higher than its pressure sensitive voltage, there is certain inhibitory action.Need to consider
Be a little low amplitude value surge voltage in side circuit probability of occurrence, far above the probability of occurrence of amplitude surge voltage；
Although this low amplitude value surge voltage does not result in the destruction of circuit devcie, the deterioration of some circuit devcies can be accelerated.
The content of the invention
The utility model purpose is directed to above the deficiencies in the prior art, there is provided it is a kind of can limits reduction residual voltage electricity
Gush protection circuit
The utility model purpose can be achieved through the following technical solutions；A kind of low residual voltage surge of connection in series-parallel automatic conversion is protected
Protection circuit, its described circuit is that three element A, B, C series connection, three elements A, B, C described in it can be respectively：
（1）, three series connection element A, B, C be the piezoresistor of same characteristic；
（2）, three series connection element A, B, C be two ends element A, C be same characteristic piezoresistor, intermediary element
B is linear resistance or inductively or capacitively element；
（3）, three series connection element A, B, C be two ends element A, C be same characteristic piezoresistor, middle unit
Part B is the piezoresistor with element A, C different qualities at two ends；
Voltage switch is respectively parallel with element A, B of element A, B, C composition series circuit and element B, C tandem compound two ends
Characteristic element.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, its unit that series circuit is constituted in element A, B, C
Part A, B and element B, C tandem compound two ends are parallel with the voltage switch characteristics element and linear resistance of concatenation respectively.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, the element of series circuit is constituted in element A, B, C
The wherein one end at A, B and element B, C tandem compound two ends is parallel with the voltage switch characteristics element and linear resistance of concatenation.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, the element of series circuit is constituted in element A, B, C
A, B and element B, C tandem compound two ends are parallel with the voltage switch characteristics element and inductance element of concatenation respectively.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, the element of series circuit is constituted in element A, B, C
The wherein one end at A, B and element B, C tandem compound two ends is parallel with the voltage switch characteristics element and inductance element of concatenation.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, the element of series circuit is constituted in element A, B, C
A, B and element B, C tandem compound two ends are parallel with voltage switch characteristics element, linear resistance and the inductance element of concatenation respectively.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, the element of series circuit is constituted in element A, B, C
The wherein one end at A, B and element B, C tandem compound two ends is parallel with voltage switch characteristics element, linear resistance and the inductance of concatenation
Element.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, it is characterised in that described in element A, B, C composition
Element A, B of series circuit and element B, C tandem compound two ends are parallel with the voltage switch characteristics element and electric capacity of concatenation respectively.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, it is characterised in that described in element A, B, C composition
Element A, B of series circuit and the wherein one end at element B, C tandem compound two ends are parallel with the voltage switch characteristics element of concatenation
And electric capacity.
The low residual voltage surge protecting circuit of described connection in series-parallel automatic conversion, the pairing of its element characteristic can guarantee that two-way is in parallel
The difference between current of electric discharge is not more than 10%.
Technological progress of the present utility model is the functional characteristics of the low residual voltage surge protecting circuit of this connection in series-parallel automatic conversion
It is with the difference for invading surge voltage peak value, energy automatic conversion working condition, it is ensured that low residual voltage.
Brief description of the drawings：
Fig. 1 is the basic principle schematic of the utility model circuit；
Fig. 2 is element A, B and element B, C series connection group in element A, B, C composition series circuit of the utility model circuit
Close voltage switch characteristics element and linear resistance principle schematic that two ends are parallel with concatenation respectively;
Fig. 3 is element A, B and element B, C series connection group in element A, B, C composition series circuit of the utility model circuit
The wherein one end for closing two ends is parallel with the voltage switch characteristics element and linear resistance principle schematic of concatenation;
Fig. 4 is element A, B and element B, C series connection group in element A, B, C composition series circuit of the utility model circuit
Close voltage switch characteristics element and inductance element principle schematic that two ends are parallel with concatenation respectively;
Fig. 5 is element A, B and element B, C series connection group in element A, B, C composition series circuit of the utility model circuit
The wherein one end for closing two ends is parallel with the voltage switch characteristics element and inductance element principle schematic of concatenation;
Fig. 6 is the concrete application schematic diagram of protection circuit of the utility model in single-phase three-wire power supply；
Fig. 7 is the three three overvoltage protection circuit diagrams of pressure two pipe basic circuit units composition；
Fig. 8 is that the utility model element A, B, C constitute series circuit, its element A, B and element B, C tandem compound two ends point
Voltage switch characteristics element D1, D2 and electric capacity G1, G2 circuit diagram of concatenation are not parallel with；
Fig. 9 presses two tubular constructions for the utility model is protected between L-N using three, is protected using conventional between L-PE, N-PE
Two pressure one tubular construction circuit diagrams；
Figure 10, Figure 11, Figure 12, Figure 13, Figure 14 are the utility model performance test schematic diagram.
Specific embodiment：
The low residual voltage surge protecting circuit of the utility model connection in series-parallel automatic conversion, is mainly used in the lightning protection of power frequency supply circuit
With the protection of anti-switching overvoltage, particularly for requiring the application scenario of low residual voltage and high reliability, mode of operation can be " phase
Line-phase line ", " phase line-center line ", " phase line-ground wire ", and " center line-ground wire " etc..
As shown in figure 1, being basic circuit unit of the present utility model, i.e., the element of series circuit is constituted in element A, B, C
A, B and element B, C tandem compound two ends are respectively parallel with voltage switch characteristics element D, i.e. D1, D2.
Using scheme of the present utility model, surge early stage, three element A, B, C series connection can be than accurately realizing setting
The protection of meter starts voltage.Subsequent voltage switch characteristics element D conductings, make piezo-resistance be changed into parallel-connection structure from cascaded structure,
Increase considerably its through-current capability, residual voltage also and then significantly declines.Its last residual voltage value is substantially want when pressure-sensitive in one
Residual voltage during by 1/3rd electric currents.
After surge terminates, due to the effect of piezo-resistance, the afterflow of voltage switch characteristics element D can not be maintained, voltage
Switching characteristic element D returns to off-state again, and piezo-resistance also rotates back into series connection by parallel connection.
Embodiment 1：It is as shown in Figure 1 basic circuit unit embodiment of the present utility model, using three two pipe knots of pressure
Structure, i.e. element A, B, C are three piezo-resistances and two compress switch characteristic element D1, D2.Three piezo-resistances use 14D271,
After series connection, it is 810V, leakage current very little that it merges piezo-resistance.Two tube voltage switching characteristic element D1, D2 are gas-discharge tubes；
Under 5000A, the impact of 8/20 surge pulse, the residual voltage value that this circuit is measured is 680V.And the series connection of three 14D271 is suitable
In a 14D811, the residual voltage of a 14D811 is usually 1880V ~ 2200V.
Embodiment 2：As shown in Fig. 2 be one embodiment of the present utility model, in 220/240V low-voltage power circuits,
The probability of happening that amplitude is slightly above the surge voltage of system voltage is very high.When voltage switch characteristics element D is gas-discharge tube, because
Its pulse breakdown voltage is high, usually 800V to 1000V, it is impossible to play inhibitory action to this kind of surge voltage.Therefore this practicality is new
The low residual voltage surge protecting circuit of type serioparallel exchange uses the group of " piezoresistor+voltage switch characteristics element D+ linear resistances E "
Close to suppress this kind of surge voltage.Piezo-resistance A, B and piezo-resistance B, C of series circuit are constituted in piezo-resistance A, B, C
Tandem compound two ends are parallel with voltage switch characteristics element D1, D2 and linear resistance E1, E2 of concatenation respectively.
Fig. 3 is the utility model circuit in piezo-resistance A, B, piezo-resistance A, B of C composition series circuits and pressure-sensitive electricity
The wherein one end at resistance B, C tandem compound two ends is parallel with the voltage switch characteristics element D1 and linear resistance E of concatenation, and the other end is simultaneously
It is associated with voltage switch characteristics element D2.
Embodiment 3：As shown in fig. 6, being that the concrete application of protection circuit of the utility model in single-phase three-wire power supply is shown
It is intended to, the circuit is using two three pressure two pipe units splicings.Ground connection discharge tube D and two is one, can be used for general L-N-PE tri-
In line protection circuit.
Embodiment 4：It is base as shown in fig. 7, being the three three overvoltage protection circuits of pressure two pipe basic circuit units composition
The combination of this circuit unit is applied in the line protection circuits of L-N-PE tri-.
Embodiment 5：As shown in figure 8, piezo-resistance A, B, C constitute piezo-resistance A, B and piezo-resistance B, C of series circuit
Tandem compound two ends are parallel with voltage switch characteristics element D1, D2 and electric capacity G1, G2 of concatenation respectively.
Embodiment 6, as shown in figure 9, the utility model is protected using three two tubular constructions of pressure between L-N, i.e. element A, B, C is
Three piezo-resistances and two voltage switch characteristics elements D1 and D2.Protected between L-PE, N-PE and managed using two conventional pressures one
Structure, i.e. piezo-resistance A, B and voltage switch characteristics unit D3.
Pulse current peak from small to large when work characteristics and characteristic, as shown in Figure 10,11,12,13,14, performance survey
Test result is shown in Table 1, and the time value t in figure, electric current i and voltage u value all take from waveform sampling table.Figure 14 is new this practicality
Type pulse current working characteristics, it is less than 1000V in the highest residual voltage of maximum discharge current 4840A (desired value 5000A).
The pulse current peak of table 1 from small to large when work characteristics and characteristic
The utility model is in a particular application, it is necessary to note：
1st, absolutely reliability screening is carried out to piezoresistor, rejecting has the product of initial failure hidden danger
2nd, by the piezoresistor of reliability screening, the qualification test that should carry out guideline lives is qualified, and implements the life-span
Maintain management.If without particular provisions, the life-span year is limited to 10 years；
3rd, nominal discharge current InIt is divided into 8/20-2kA, 5kA, 10k Three Estate, in InUnder electric current, by element characteristic
Pairing, and change series connection linear impedance so that the difference between current of two GDT is not more than 10%；
4, for the utility model of 220/240 power frequency supply circuit, the residual voltage under nominal discharge current is not more than
1000V。
The course of work of the present utility model is（By taking the overvoltage protection circuit of basic circuit unit composition as an example）：
1st, for " low amplitude value surge ", only 3 element A, B, C series connection conductings suppress surge voltage, shunt surge current
（Two switch element D, i.e. D1, D2 are not turned on）；
2nd, for " medium amplitude surge ", single channel " voltage switch characteristics element D and voltage-limiting element " tandem compound D1-C or
A-D2 is turned on, and suppresses surge voltage, shunts surge current；
3rd, turned on for " amplitude surge " two-way " switch element-voltage-limiting element " D1-C and A-D2, suppress surge electricity
Pressure, shunts surge current.
Claims (10)
1. the low residual voltage surge protecting circuit of a kind of connection in series-parallel automatic conversion, it is characterised in that the circuit is, three element A, B,
C connects, and three elements A, B, C described in it can be respectively：
（1）, three series connection element A, B, C be the piezoresistor of same characteristic；
（2）, three series connection element A, B, C be two ends element A, C be same characteristic piezoresistor, intermediary element B is
Linear resistance or inductively or capacitively element；
（3）, three series connection element A, B, C be two ends element A, C be same characteristic piezoresistor, middle element B
It is the piezoresistor with element A, C different qualities at two ends；
Voltage switch characteristics are respectively parallel with element A, B of element A, B, C composition series circuit and element B, C tandem compound two ends
Element.
2. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
Element A, B of part A, B, C composition series circuit and element B, C tandem compound two ends are parallel with the voltage switch characteristics of concatenation respectively
Element and linear resistance.
3. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
The voltage that element A, B of part A, B, C composition series circuit and the wherein one end at element B, C tandem compound two ends are parallel with concatenation is opened
Close characteristic element and linear resistance.
4. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
Element A, B of part A, B, C composition series circuit and element B, C tandem compound two ends are parallel with the voltage switch characteristics of concatenation respectively
Element and inductance element.
5. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
The voltage that element A, B of part A, B, C composition series circuit and the wherein one end at element B, C tandem compound two ends are parallel with concatenation is opened
Close characteristic element and inductance element.
6. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
Element A, B of part A, B, C composition series circuit and element B, C tandem compound two ends are parallel with the voltage switch characteristics of concatenation respectively
Element, linear resistance and inductance element.
7. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
The voltage that element A, B of part A, B, C composition series circuit and the wherein one end at element B, C tandem compound two ends are parallel with concatenation is opened
Close characteristic element, linear resistance and inductance element.
8. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
Element A, B of part A, B, C composition series circuit and element B, C tandem compound two ends are parallel with the voltage switch characteristics of concatenation respectively
Element and electric capacity.
9. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to claim 1, it is characterised in that described in unit
The voltage that element A, B of part A, B, C composition series circuit and the wherein one end at element B, C tandem compound two ends are parallel with concatenation is opened
Close characteristic element and electric capacity.
10. the low residual voltage surge protecting circuit of connection in series-parallel automatic conversion according to any one of claim 1 to 7, its feature exists
In the pairing of element characteristic can guarantee that the difference between current of two-way parallel discharge is not more than 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621387426.8U CN206250763U (en) | 2016-12-16 | 2016-12-16 | The low residual voltage surge protecting circuit of connection in series-parallel automatic conversion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621387426.8U CN206250763U (en) | 2016-12-16 | 2016-12-16 | The low residual voltage surge protecting circuit of connection in series-parallel automatic conversion |
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| CN206250763U true CN206250763U (en) | 2017-06-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505544A (en) * | 2016-12-16 | 2017-03-15 | 深圳市辰驹电子科技有限公司 | The low residual voltage surge protecting circuit of connection in series-parallel automatic conversion |
| CN109217275A (en) * | 2018-08-22 | 2019-01-15 | 深圳市瑞隆源电子有限公司 | High voltage bearing anti-thunder surge suppression circuit, device and power supply adaptor |
-
2016
- 2016-12-16 CN CN201621387426.8U patent/CN206250763U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505544A (en) * | 2016-12-16 | 2017-03-15 | 深圳市辰驹电子科技有限公司 | The low residual voltage surge protecting circuit of connection in series-parallel automatic conversion |
| CN106505544B (en) * | 2016-12-16 | 2018-11-16 | 深圳市辰驹电子科技有限公司 | The low residual voltage surge protecting circuit of series-parallel automatic conversion |
| CN109217275A (en) * | 2018-08-22 | 2019-01-15 | 深圳市瑞隆源电子有限公司 | High voltage bearing anti-thunder surge suppression circuit, device and power supply adaptor |
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