CN201051665Y - AC bidirectional current limit and voltage limit secure device - Google Patents
AC bidirectional current limit and voltage limit secure device Download PDFInfo
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- CN201051665Y CN201051665Y CNU2007200064390U CN200720006439U CN201051665Y CN 201051665 Y CN201051665 Y CN 201051665Y CN U2007200064390 U CNU2007200064390 U CN U2007200064390U CN 200720006439 U CN200720006439 U CN 200720006439U CN 201051665 Y CN201051665 Y CN 201051665Y
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Abstract
The utility model relates to an alternating current two-way current-limiting voltage-limiting safety device, in particular to a safety device which is applicable to various electric appliances and is used for strengthening the electric safety and reducing possible faults and dangers. The utility model is constituted by an alternating current two-way current-limiting circuit and an alternating current two-way voltage-limiting circuit, which can repress the possible large electric current and pulse electric voltage on the lateral side of the alternating current of the electric appliances under various cases, thereby strengthening the electric safety of various electric appliances. The electric appliances with the device can be extensively used in users which have alternating current power, such as factories, mines, institutions, enterprises and households.
Description
Technical field
The utility model relates to a kind of alternating-current bidirectional current limiting pressure-limiting safety device, a kind of safety device that is applicable to various electrical equipment with enhancing Electrical Safety, the issuable fault of minimizing and danger uses the electrical equipment of this safety device to be widely used in AC power users such as factory, ore deposit, office, enterprise and family.
Background technology
Most of DC power supply all has safe current limiting pressure-limiting: as LM7812 commonly used; its maximum short circuit current is limited in 1.5A; and itself be exactly pressure limiting output; the output of Switching Power Supply also mostly has the protection of maximum current and maximum voltage limit, and current limiting pressure-limiting can reduce the unsafe factor of the electrical appliance of back.But; but do not see the universal safety device of alternating-current bidirectional current limiting pressure-limiting protection, as if ignored by market (currently used interchange current limiting pressure-limiting is fuse only, when current/voltage above more all being reflected as blown fuse; its response speed is slow, acts on very limited).In fact; the alternating-current bidirectional current limiting pressure-limiting protection is necessary; the unsafe factors such as big electric current that may produce in the time of can reducing short circuit or fault; the instantaneous large-current that in the time of also can reducing alternating current and power on rectifier filter electrolysis charging is produced also can be isolated the AC network pulse voltage to avoid harmful effect to electrical equipment or the like.These all have realistic meaning, can reduce the damage of components and parts during as careless short circuit, can reduce primary and contact big spark bad or that produced when disconnecting suddenly with power line, the electric spark that can reduce AC power contact point place is to satisfy the Sefe antiexplosion requirement of inflammable and explosive occasion, issuable trip phenomenon simultaneously powers in the time of can solving because of a large amount of uses such as the electrical equipment that uses current rectifying and wave filtering circuit such as electricity-saving lamps, can isolate the AC network pulse voltage to reduce the suffered interference of electrical equipment ... the utility model relates to a kind of alternating-current bidirectional current limiting pressure-limiting safety device, its objective is in order to increase the Electrical Safety of various electrical equipment, to reduce issuable fault and danger, use the electrical equipment of this safety device to be widely used in factory, the ore deposit, office, AC power user such as enterprise and family.
The utility model content
The purpose of this utility model is to provide a kind of alternating-current bidirectional current limiting pressure-limiting safety device, can suppress the alternating current source issuable big electric current of institute and the pulse voltage of electrical equipment in all cases, thereby increases the Electrical Safety of various electrical equipment.The utility model is combined by alternating-current bidirectional current limiting circuit and alternating-current bidirectional pressure limiting circuit.
For achieving the above object, technical solution of the present utility model is:
The utility model provides a kind of alternating-current bidirectional current limiting pressure-limiting safety device, is made up of discrete component, and transient response is good, and reaction speed is fast.It comprises the alternating-current bidirectional current limiting circuit, and its circuit theory diagrams and block diagram are seen Fig. 1, and block diagram is represented with alphabetical A, the alternating-current bidirectional pressure limiting circuit, and its circuit theory diagrams and block diagram are seen Fig. 2, block diagram is represented with alphabetical V; Its basic structure is to carry out the alternating-current bidirectional pressure limiting after alternating-current bidirectional current limiting, just because of the alternating-current bidirectional current limiting of front has been arranged, the alternating-current bidirectional pressure limiting of back just more has essential meaning, and the two is combined to form alternating-current bidirectional current limiting pressure-limiting safety device, and the structured flowchart of its combinational circuit is seen Fig. 3 and Fig. 5.
(1), alternating-current bidirectional current limiting circuit:
As shown in Figure 1, alternating-current bidirectional current limiting circuit A mainly is made up of diode D1, D1 ', voltage stabilizing didoe DZ1, DZ1 ', triode Q1, Q2, Q3, Q1 ', Q2 ', Q3 ', resistance R 1, R2, R3, R4, R1 ', R2 ', R3 ', R4 '; The main effect one of alternating-current bidirectional current limiting circuit is the maximum current that restriction flows into electrical equipment, the 2nd, and when being connected to the alternating-current bidirectional pressure limiting circuit, the back can isolate pulse voltage.The alternating-current bidirectional current limiting circuit also can claim the alternating-current bidirectional constant-current circuit.
Alternating-current bidirectional current limiting circuit A is divided into two parts up and down, if AC power is sent into from the left side, D1 ', DZ1 ', Q1 ', Q2 ', Q3 ', R1 ', R2 ', R3 ', R4 ' composition alternating current positive half wave current-limiting circuit, D1, DZ1, Q1, Q2, Q3, R1, R2, R3, R4 form the negative half-wave current-limiting circuit of alternating current.
As shown in Figure 1, when the alternating voltage of importing is the negative right timing in a left side, Fig. 1 circuit first half conducting Lower Half is ended, the electric current of the first half flows through D1, enter by R1, R2, Q1, Q2, Q3, the constant-current source circuit that R4 forms, the peak current that is limited be Iop (A)=Vbe1/R1=0.60 (V)/R1 (Ω) (because of the operating current of Q1 less, so its Vbe is also less, get Vbe1=0.60V), its average current Io (A)=0.707Iop (A), comprehensive above two formulas get Io (A) ≈ 0.42 (V)/R1 (Ω) (formula one), example: when Io gets 50mA, R1=0.42/0.05=8.4 Ω, 8.4 Ω can use 8.2 Ω/0.25W high-precision metal film resistance.When Q1 and R4 determined, the precision of this constant-current source only depended on the precision of R1.The R3 of Fig. 4, the effect of DZ1 are: when the voltage at constant-current source two ends increased, because the existence of R4, IR4 increases made the Ic1 of Q1 also increase, Ib1 increases, Vbe1 also increases, and the electric current of this constant-current source will slightly increase thereupon; At this moment add R3, DZ1, R2 is gone up produce some pressure drops, impel VR1 constant substantially, so that the electric current of constant-current source keeps substantially constant.The value computational methods of R3 are as follows: example when the constant-current source both end voltage when 4V is raised to 100V, electric current increases about 10%, be that VR1 increases about 10%, at this moment just need make VR1 descend 10%, R2 gets 470 Ω resistance, at this moment DZ1 gets the 2.7V voltage-stabiliser tube, R3 (Ω) ≈ { [100-(2.7+0.6)] (V)/0.6 * 10% (V) } * R2 (Ω) ≈ 758 (K Ω) (formula two) then, desirable 750K Ω resistance; During actual design, also can insert the 0-100V D.C. regulated power supply to the two ends of Fig. 1 and confirm by actual measurement, when input voltage during at 3V-100V, input current is constant substantially.When R2 get 470 Ω, when DZ1 gets 2.7V, the also desirable empirical value of resistance R 3 is about 750-820K Ω.
This interchange current-limiting circuit is actually by two unidirectional current-limiting circuit reverse parallel connections to be formed, and when input voltage is left side when positive right negative, Fig. 1 Lower Half conducting first half ends, and analytical method is the same.
The key element of Fig. 1 is Q2, Q2 ', Q3, Q3 '.When input ac voltage was 127V or 220V, Q2, Q2 ' can select MJE13003 (400V/1.5A/14W) or MJ E13005 (400V/4A/60W) for use, and its Hfe generally at 30-40 doubly.Q3, Q3 ' can select the transistor of 2N3440 Vceo 〉=400V such as (450V/1A/1W) for use, and its Hfe generally at 60-100 doubly.When input ac voltage was 127V, Q3, Q3 ' also can select the transistor of 2SC227 (300V/0.1A/0.75W) or 2SC2610 Vceo=300V such as (300V/0.1A/0.80W) for use, and this type of transistor model is more.Transistor all selects for use the NPN type to be because the high back-pressure model of NPN type is many.
This alternating-current bidirectional current limiting circuit peak voltage drop when operate as normal is about 3V, and for exchanging 127V or 220V voltage, actual efficiency is not low, and efficient can reach 99% during alternating current 220V.The common port of the common port of D1 ', R1 and Q1 and D1, R1 ' and Q1 ' is the input and the output of any utmost point of alternating current, and because of this circuit adopts the holohedral symmetry design, optional any end is output for the input other end, and needn't distinguish polarity.The element that this alternating-current bidirectional current limiting circuit adopts has only diode, triode and resistance, be easy to integrated, if be integrated into a slice application-specific integrated circuit (ASIC), just be " alternating-current bidirectional current limiting diode " or " alternating-current bidirectional current regulator diode ", can reduce cost and be easier to use.
(2), alternating-current bidirectional pressure limiting circuit:
As shown in Figure 2, alternating-current bidirectional pressure limiting circuit V mainly is made up of transient voltage inhibition diode DZ3, DZ4, resistance R 5, capacitor C 1.The main effect of alternating-current bidirectional pressure limiting circuit: the first when ACIN end be that AC network is when existing pulse voltage, the alternating-current bidirectional pressure limiting circuit can absorb these pulses, it two is when the ACOUT termination has transformer, when AC power contacts bad or disconnects suddenly, can produce pulse voltage, the alternating-current bidirectional pressure limiting circuit also can absorb these by pulse voltage that electrical equipment produced, with the electric spark that reduces to produce, just can obtain optimum efficiency under the cooperation that these two act on front alternating-current bidirectional current limiting circuit in AC power contact point place.
DZ3, DZ4 select for use P6KE * * * the A transient voltage suppresses diode (* * * volt/5W, transient peak power 600W/1ms), its puncture voltage * * * lying prostrate should be slightly higher than AC power maximum peak voltage, C1 selects 105PF/400V for use, R5 selects 3K/3W for use.When AC network exists pulse voltage or transformer to produce a high voltage pulse, because of the voltage at electric capacity two ends can not suddenly change, this voltage is added on DZ3, the DZ4 by R5 and C1, and DZ3, DZ4 can absorb the transient voltage that exceeds the AC power peak value, has guaranteed that the ACOUT end can not produce high voltage.DZ3, DZ4 also can use a bidirectional transient voltage instead and suppress diode.
(3), the utility model structured flowchart one:
The utility model structured flowchart sees Fig. 3, AC-input voltage is through alternating-current bidirectional current limiting circuit A current limliting, after the alternating-current bidirectional pressure limiting circuit V pressure limiting, form one do not have that big pulse voltage is disturbed, AC power is used to offer electrical equipment comparatively stably, and the unsafe factor that may produce when reducing short circuit or fault.
(4), the utility model structured flowchart two:
The utility model structured flowchart two is seen Fig. 5, for strengthening reliability and fail safe to meet the Sefe antiexplosion requirement of inflammable and explosive occasion, AC-input voltage is through two-stage alternating-current bidirectional current limiting circuit A series dual current limliting, after the two-stage alternating-current bidirectional pressure limiting circuit V dual pressure limiting in parallel, form one do not have that big pulse voltage is disturbed, AC power is used to offer electrical equipment comparatively stably, and the unsafe factor that may produce when reducing short circuit or fault.
The utility model can be integrated into a slice application-specific integrated circuit (ASIC), and is only external C1, can reduce cost and be easier to like this to use.
The beneficial effects of the utility model are: a kind of alternating-current bidirectional current limiting pressure-limiting safety device is provided, use it can increase the Electrical Safety of various electrical equipment, reduce issuable fault and danger, to be applicable to AC power users such as factory, ore deposit, office, enterprise and family.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Fig. 1 alternating-current bidirectional current limiting circuit theory diagrams of the present utility model and block diagram;
Fig. 2 alternating-current bidirectional pressure limiting circuit of the present utility model schematic diagram and block diagram;
Fig. 3 the utility model structured flowchart one;
Fig. 4 the utility model structured flowchart one circuit theory diagrams;
Fig. 5 the utility model structured flowchart two;
Fig. 6 the utility model structured flowchart two circuit theory diagrams.
Embodiment
Fig. 3 is a structured flowchart one of the present utility model, and its circuit theory diagrams are seen Fig. 4.Present embodiment adopts one-level alternating-current bidirectional current limiting circuit and one-level alternating-current bidirectional pressure limiting circuit to form, and can satisfy the requirement of general electrical equipment.Designing requirement: AC-input voltage 220V ± 10%, power output 10W.Will be at 220V-10% power output 10W, alternating current effective value Io=10W/ (220V-10%)=50.5mA then, by (formula one) Io (A) ≈ 0.42 (V)/R1 (Ω) calculate R1=8.2 Ω, get R2=470 Ω then by (formula two) calculate R3=750K Ω, DZ1 gets 2.7V, get R4=30K Ω/1W, D1=1N4007, Q1 does not require to be taken as 2N5551 to back-pressure, Q2 gets MJE13003 (400V/1.5A/14W), Q3 gets 2N3440 (450V/1A/1W), and C1 gets 105PF/400V, and R5 selects 3K/3W for use.Exchange input peak-peak voltage=220V * 1.414 * 110% ≈ 342V, DZ3DZ4 gets P6KE350A (350 volts/5W, transient peak power 600W/1ms).The parameter of R1 ' R2 ' R3 ' R4 ' D1 ' DZ1 ' Q1 ' Q2 ' Q3 ' is identical with the R1R2R3R4D1DZ1Q1Q2Q3 correspondence.
Fig. 5 is a structured flowchart two of the present utility model, and its circuit theory diagrams are seen Fig. 6.Present embodiment adopts two-stage alternating-current bidirectional current limiting circuit series dual current limliting and the dual pressure limiting in parallel of two-stage alternating-current bidirectional pressure limiting circuit, strengthens reliability with duplicate protection, can satisfy for example requirement of Sefe antiexplosion instrument of electrical equipment with higher safety requirements.Because of circuit is identical, the same Fig. 3 of calculation of parameter.
Claims (2)
1. alternating-current bidirectional current limiting pressure-limiting safety device, it is characterized in that: it comprises an alternating-current bidirectional current limiting circuit, an alternating-current bidirectional pressure limiting circuit; Described alternating-current bidirectional current limiting circuit is made up of diode D1, D1`, voltage stabilizing didoe DZ1, DZ1`, triode Q1, Q2, Q3, Q1`, Q2`, Q3`, resistance R 1, R2, R3, R4, R1`, R2`, R3`, R4`; The utmost point of the positive pole serial connection R1 of D1`, the common port of D1` and R1 is connected with the emitter of Q1, the utmost point of another utmost point serial connection R2 of R1, the base stage of another utmost point serial connection Q1 of R2, the utmost point of the common port serial connection R3 of R2 and Q1, the positive pole of another utmost point serial connection DZ1 of R3, R1, the emitter of the common port serial connection Q3 of R2, the emitter of the base stage serial connection Q2 of Q3, the base stage of Q2 connects the collector electrode of Q1, Q1, the utmost point of the common port serial connection R4 of Q2, another utmost point of R4 and negative pole and the Q3 of DZ1, the collector electrode of Q2 is attempted by the negative pole of D1, the utmost point of the positive pole serial connection R1` of D1, the common port of D1 and R1` is connected with the emitter of Q1`, the utmost point of another utmost point serial connection R2` of R1`, the base stage of another utmost point serial connection Q1` of R2`, the utmost point of the common port serial connection R3` of R2` and Q1`, the positive pole of another utmost point serial connection DZ1` of R3`, R1`, the emitter of the common port serial connection Q3` of R`2, the emitter of the base stage serial connection Q2` of Q3`, the base stage of Q2` connects the collector electrode of Q1`, Q1`, the utmost point of the common port serial connection R4` of Q2`, another utmost point of R4` and negative pole and the Q3` of DZ1`, the collector electrode of Q2` is attempted by on the negative pole of D1`; Described alternating-current bidirectional pressure limiting circuit is made up of transient voltage inhibition diode DZ3, DZ4, resistance R 5, capacitor C 1; C1 also meets R5, the positive pole of the utmost point serial connection DZ3 of R5, the negative pole of the negative pole serial connection DZ4 of DZ3; Another utmost point of the R5 of the positive pole serial connection alternating-current bidirectional pressure limiting circuit of the D1 of alternating-current bidirectional current limiting circuit; The positive pole of the positive pole of the D1` of alternating-current bidirectional current limiting circuit and alternating-current bidirectional pressure limiting circuit DZ4 is formed alternating current input ACIN, and the positive pole of the positive pole of the D1 of alternating-current bidirectional current limiting circuit and alternating-current bidirectional pressure limiting circuit DZ4 is formed alternating current output terminals A COUT.
2. alternating-current bidirectional current limiting pressure-limiting safety device according to claim 1 is characterized in that described alternating-current bidirectional current limiting pressure-limiting safety device can be made up of two alternating-current bidirectional current limiting circuit and two alternating-current bidirectional pressure limiting circuits; By the positive pole of the D1` of two alternating-current bidirectional current limiting circuit the two poles of the earth as alternating current input ACIN; Another utmost point of the R5 of two alternating-current bidirectional pressure limiting circuits also connects, and the positive pole of the DZ4 of two alternating-current bidirectional pressure limiting circuits also connects; Another utmost point of the R5 of two alternating-current bidirectional pressure limiting circuits of positive pole serial connection of the D1 of a bidirectional current limiting circuit, the positive pole of the DZ4 of two alternating-current bidirectional pressure limiting circuits of positive pole serial connection of the D1 of another alternating-current bidirectional current limiting circuit; The positive pole serial connection point of another utmost point of the R5 of two alternating-current bidirectional pressure limiting circuits and the D1 of a bidirectional current limiting circuit is as the utmost point of alternating current output terminals A COUT, and the positive pole serial connection point of the D1 of the positive pole of the DZ4 of two alternating-current bidirectional pressure limiting circuits and another bidirectional current limiting circuit is as another utmost point of alternating current output terminals A COUT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200064390U CN201051665Y (en) | 2007-02-26 | 2007-02-26 | AC bidirectional current limit and voltage limit secure device |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007200064390U CN201051665Y (en) | 2007-02-26 | 2007-02-26 | AC bidirectional current limit and voltage limit secure device |
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| CN201051665Y true CN201051665Y (en) | 2008-04-23 |
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| CNU2007200064390U Expired - Fee Related CN201051665Y (en) | 2007-02-26 | 2007-02-26 | AC bidirectional current limit and voltage limit secure device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI412911B (en) * | 2010-08-10 | 2013-10-21 | ||
| CN105591576A (en) * | 2014-10-23 | 2016-05-18 | 力山工业股份有限公司 | Motor control circuit capable of suppressing interference signals |
-
2007
- 2007-02-26 CN CNU2007200064390U patent/CN201051665Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI412911B (en) * | 2010-08-10 | 2013-10-21 | ||
| CN105591576A (en) * | 2014-10-23 | 2016-05-18 | 力山工业股份有限公司 | Motor control circuit capable of suppressing interference signals |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080423 |