CN201345534Y - Switch power supply cycle-by-cycle overvoltage protective circuit - Google Patents
Switch power supply cycle-by-cycle overvoltage protective circuit Download PDFInfo
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- CN201345534Y CN201345534Y CNU2008203038725U CN200820303872U CN201345534Y CN 201345534 Y CN201345534 Y CN 201345534Y CN U2008203038725 U CNU2008203038725 U CN U2008203038725U CN 200820303872 U CN200820303872 U CN 200820303872U CN 201345534 Y CN201345534 Y CN 201345534Y
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Abstract
The utility model relates to the overvoltage protection technique, in particular to a switch power supply input overvoltage protective circuit. The technical scheme of the utility model includes that a current output main circuit is formed by a silicon controlled thyristor SCR, a diode D1 and a capacitor C1, a control circuit I for generating silicon controlled thyristor trigger pulse is formed by a resistor R1, a TVS voltage regulator tube, a capacitor C2 and a resistor R3, and a control circuit II for generating silicon controlled thyristor trigger pulse is formed by a diode D2, a resistor R2, the TVS voltage regulator tube, the capacitor C2 and the resistor R3. The protective circuit utilizes the silicon controlled thyristor AC chipping principle, directly samples electric network voltage, and automatically changes conducting time of the silicon controlled thyristor according to alternating input voltage, thereby achieving cycle-by-cycle control to an alternating input power supply, avoiding defects of slow response time, being capable of realizing automatically correcting voltage fluctuation of the electric network in time, and further achieving overvoltage protection to post-stage power supply circuits.
Description
Technical field
The utility model relates to a kind of over-voltage protection technology, especially relates to a kind of Switching Power Supply protection circuit against input over-voltage.
Background technology
Under, the condition of severe complicated in some power environment conditions, as the line voltage instability, 220VAC and 380VAC are difficult for the occasion of resolution, power input input too high voltages, comprise that owing to the inside components and parts in the Switching Power Supply in the electric equipment part Chang Yin such as storage capacitor bears too high voltage and damages, influence the operate as normal of whole electrical equipment.In order to protect electric equipment in this case, the general method that adopts is to add overvoltage crowbar at power input.Common have following several guard method.Method one: adopt positive temperature coefficient fuse PTCC and metal-oxide varistor MOV Combined Protection, as shown in Figure 1, when the ac input end input is higher than a certain numerical value, the resistance value of varistor sharply descends, form big current circuit, electric current generates heat rapidly PPTC owing to passed through greatly, changes high-impedance state into, the electric current that link tester is crossed limits very for a short time, reaches the purpose of protection power supply late-class circuit; But it is shorter useful life that its shortcoming is a piezo-resistance, and the response time is slower, and protection be in case after starting, must cut off the electricity supply, treat that low resistance state is got back in the PPTC cooling after, just can work on.Method two: method two is the modified model of method one; replace varistor with voltage-stabiliser tube; as shown in Figure 2; voltage-stabiliser tube has overcome the shortcoming of varistor; response time is exceedingly fast, long service life, and the consistency of clamping voltage is higher; when the ac input end input is higher than the clamping voltage of voltage-stabiliser tube; voltage-stabiliser tube is breakdown, and the impedance of voltage-stabiliser tube reduces immediately, and with voltage clamp on the clamping voltage of voltage-stabiliser tube; form big current circuit; electric current generates heat rapidly PPTC owing to passed through greatly, changes high-impedance state into, and the electric current that link tester is crossed limits very for a short time; reached the purpose of protection power supply late-class circuit; in case but its shortcoming is after protecting startup, must cut off the electricity supply, and treats the PPTC cooling; after getting back to low resistance state, could continue operate as normal.Method three: adopt thyristor overvoltage protection method; as shown in Figure 3; when AC-input voltage rises to the setting voltage of protective circuit (change R1, R2 resistance can change setting voltage); diac DS conducting, the thyristor conducting, electric current forms big current circuit by PPTC, thyristor current-limiting resistance R3, thyristor; electric current generates heat rapidly PPTC owing to passed through greatly; change high-impedance state into, the electric current that link tester is crossed limits very for a short time, reaches the purpose of protection power supply late-class circuit.But its shortcoming is the protection of PPTC in case after starting, must cut off the electricity supply, treat that low resistance state is got back in the PPTC cooling after, could continue operate as normal.Method four: adopt thyristor voltage-limiting protection method; as shown in Figure 4; its principle is: control circuit is according to the size of AC-input voltage; by comparison, computing circuit; export suitable delayed trigger; the ON time of control thyristor makes the voltage of Switching Power Supply late-class circuit be no more than maximum operating voltage.Though this Protection Code is good, control circuit is very complicated, and realizes the cost height, is difficult for using in small-power switching power-supply.Method five: adopt relay overvoltage protection method; after AC-input voltage raises; direct voltage after the rectification also raises; when this direct voltage was higher than the clamping voltage of voltage-stabiliser tube, voltage-stabiliser tube punctured, triode Q1 conducting; the actuating of relay; normally closed electric shock is disconnected to rise, and cuts off back level power supply circuit, reaches input overvoltage protection purpose.Though the method is simple and reliable; but its shortcoming is in the big occasion of voltage fluctuation; relay moves again and again; continous-stable power-supplying to power supply exerts an influence; this protective circuit must provide the power supply of relay work in addition owing to added relay, and is cumbersome; and volume is bigger, is difficult for using in small-power switching power-supply.
Summary of the invention
The utility model mainly is to solve above-mentioned existing in prior technology problem; provide a kind of thyristor that utilizes to exchange the copped wave principle; the Direct Sampling line voltage according to the size of AC-input voltage, changes the mains switch overvoltage crowbar of the ON time of thyristor automatically.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit is characterized in that:
Between interchange input and load, be connected with an overvoltage crowbar one, this overvoltage crowbar one includes thyristor, voltage-stabiliser tube, first resistance, second resistance, second diode and second electric capacity, the anode of this thyristor links to each other with ac input end, its negative electrode links to each other with load end, this voltage-stabiliser tube negative electrode links to each other with the gate pole of thyristor, the anode of voltage-stabiliser tube is connected respectively on first resistance and second resistance of mutual parallel connection, first resistance directly links to each other with ac input end, second resistance links to each other with ac input end after connecting second diode that oppositely is provided with voltage-stabiliser tube, and second electric capacity is connected between thyristor negative electrode and the voltage-stabiliser tube negative electrode;
Between load input terminal and load ground end, be connected with first electric capacity.
As a kind of preferred version of such scheme, between thyristor negative electrode and load end, be provided with first diode that is connected in the same way with thyristor.
As a kind of preferred version of such scheme, between first diode anode and common, be connected with the 3rd resistance.
A kind of preferred version as such scheme also comprises the 3rd diode, and the negative electrode of the 3rd diode and the 3rd resistance are in series, and its negative electrode links to each other with the 3rd resistance, and anode links to each other with common.
A kind of preferred version as such scheme; between interchange input and load, be connected with and overvoltage crowbar two; this single-phase overvoltage crowbar two includes thyristor; voltage-stabiliser tube; first resistance; second resistance; the 3rd resistance; first diode; second diode; the 3rd diode and second electric capacity; the anode of this thyristor links to each other with common; its negative electrode links to each other with load end after being connected with first diode with the thyristor series aiding connection; this voltage-stabiliser tube anode links to each other with the gate pole of thyristor; the negative electrode of voltage-stabiliser tube is connected respectively on first resistance and second resistance of mutual parallel connection; first resistance directly links to each other with common; second resistance by connect with second diode that voltage-stabiliser tube is provided with in the same way after link to each other with common; second electric capacity is connected between thyristor negative electrode and the voltage-stabiliser tube anode; the 3rd resistance is connected with the 3rd diode and is arranged between first diode anode and the ac input end; the negative electrode of the 3rd diode links to each other with the 3rd diode, and its anode links to each other with ac input end.
A kind of preferred version as such scheme; between ac input end and load ground end, be connected with overvoltage crowbar three; this overvoltage crowbar three comprises thyristor; voltage-stabiliser tube; first resistance; second resistance; second electric capacity and second diode; the anode of this thyristor links to each other with load ground end; its negative electrode links to each other with ac input end; this voltage-stabiliser tube negative electrode links to each other with the gate pole of thyristor; the anode of voltage-stabiliser tube is connected respectively on first resistance and second resistance of mutual parallel connection; first resistance directly links to each other with load ground end; second resistance links to each other with load ground end after connecting second diode that oppositely is provided with voltage-stabiliser tube, and second electric capacity is connected between thyristor negative electrode and the voltage-stabiliser tube negative electrode.
As a kind of preferred version of such scheme, in overvoltage crowbar one, be provided with the 3rd diode, this diode anode links to each other with common, and its negative electrode links to each other with load end.
A kind of preferred version as such scheme; also be provided with the 3rd diode; the 3rd diode is connected on common and the load ground end line; the anode of the 3rd diode is connected with first capacitance cathode, and the negative electrode of the 3rd diode is connected with the 3rd diode anode in the overvoltage crowbar one.
Therefore; the utility model utilizes thyristor to exchange the copped wave principle; the Direct Sampling line voltage; according to the size of AC-input voltage, change the ON time of thyristor automatically, reached controlling to alternating current input power supplying by cycle; thereby avoided slow shortcoming of response time; can realize automatic, the instant correction to the fluctuation of line voltage, thereby reach overvoltage protection back level power supply circuit.
Description of drawings
Accompanying drawing 1 is first kind of line map of prior art;
Accompanying drawing 2 is second kind of line map of prior art;
Accompanying drawing 3 is the third line maps of prior art;
Accompanying drawing 4 is the 4th kind of line maps of prior art;
Accompanying drawing 5 is the 5th kind of line maps of prior art;
Accompanying drawing 6 is a kind of single-phase half-wave overvoltage protection basic diagrams of the utility model;
Accompanying drawing 7 is that a kind of single-phase half-wave overvoltage protection of the utility model is expanded line map;
Accompanying drawing 8 is a kind of single-phase full wave overvoltage protection of the utility model basic diagrams;
Accompanying drawing 9 is that a kind of single-phase full wave overvoltage protection of the utility model is expanded line map;
Accompanying drawing 10 is a kind of waveform schematic diagrames of single-phase half-wave overvoltage protection basic circuit;
Accompanying drawing 11 is voltage waveform views that single-phase half-wave overvoltage protection basic circuit A is ordered.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1:
According to single-phase half-wave overvoltage protection basic circuit shown in Figure 6, be arranged between interchange input and the load, it is made up of overvoltage crowbar 1 and diode D1, resistance R 3, capacitor C 1; The structure of this single-phase half-wave overvoltage protection basic circuit is: comprise a thyristor SCR; the anode of this thyristor SCR links to each other with ac input end; its negative electrode by connect with diode D1 that thyristor SCR is provided with in the same way after link to each other with load end; also comprise a voltage-stabiliser tube TVS; this voltage-stabiliser tube TVS negative electrode links to each other with the gate pole of thyristor SCR; the anode of voltage-stabiliser tube TVS is connected respectively on mutual parallel resistor R1 and the resistance R 2; resistance R 1 directly links to each other with ac input end; resistance R 2 links to each other with ac input end after connecting the diode D2 that oppositely is provided with voltage-stabiliser tube TVS; between thyristor SCR negative electrode and voltage-stabiliser tube TVS negative electrode, connect capacitor C 2; also be provided with resistance R 3; resistance R 3 is arranged between diode D1 anode and the ac input end, is connected with capacitor C 1 between load input terminal and load ground end.Described thyristor SCR, diode D1, capacitor C 1 have constituted electric current output major loop; Resistance R 1, TVS voltage-stabiliser tube, capacitor C 2, resistance R 3 have constituted as the control loop one that produces the thyristor trigger impulse; Diode D2, resistance R 2, TVS voltage-stabiliser tube, capacitor C 2, resistance R 3 have constituted as the control loop two that produces the thyristor trigger impulse.
The operation principle of this circuit is:
When exchanging input and be in positive half cycle initial period, the pulse-triggered end A end of thyristor SCR is low level state, and the A point voltage as shown in figure 11, thyristor SCR ends, this moment, C voltage was higher than the B point, and diode D1 is in reverse blocking state, and storage capacitor C1 can not discharge to input circuit in the other direction; Along with the voltage of positive half cycle progressively rises, electric current is by control loop one, be that resistance R 1, TVS voltage-stabiliser tube, resistance R 3 are to capacitor C 2 positive charge, this moment, voltage-stabiliser tube TVS was in the forward conduction state, along with the voltage that exchanges the positive half cycle of input progressively rises, the voltage that A is ordered also progressively rises, and the voltage of order as A is above the gate trigger voltage V of thyristor
SCRThe time, thyristor SCR conducting, capacitor C 2 charging finishes, and positive charge time of capacitor C 2 is called T
C2+(as shown in figure 10); After the thyristor SCR conducting, the B point voltage progressively rises, when the B point voltage surpasses C point voltage V
C1During (voltage C1 terminal voltage)+0.7V (forward voltage drop of diode D1), the D1 conducting, electric current charges C point voltage V by major loop to capacitor C 1
C1Progressively rise, along with the voltage of positive half cycle progressively descends, the B point voltage also progressively descends, when the B point voltage is lower than C point voltage V
C1During+0.7V, D1 ends, and the charging of capacitor C 1 is finished, and charging interval of capacitor C 1 is called T
C1(as shown in figure 10); Because the resistance of resistance R 3 is very big, flows through the keep electric current of the electric current of thyristor SCR less than thyristor, thyristor SCR ends, and cuts off electric current output major loop, and the ON time of thyristor SCR is called T
SCR(as shown in figure 10).Immediately flow through the electric current of keeping of the electric current of thyristor SCR greater than it this moment, thyristor SCR conducting, but along with input voltage reduces to when solving zero, thyristor SCR also can turn-off voluntarily, cuts off electric current output major loop.
Because the charging interval T of capacitor C 1
C1ON time T with thyristor SCR
SCRBe directly proportional the ON time T of thyristor SCR
SCRLong more, the voltage V on the capacitor C 1
C1High more; The conducting of thyristor SCR is controlled by gate pole, and gate pole reaches trigger voltage V
SCR, thyristor SCR is with regard to conducting.A point voltage V
C2Reach V
SCRTime T
C2+Long more, the ON time T of thyristor SCR
SCRMore little, the voltage on the storage capacitor C1 is also low more.As long as so control positive charge time T to C2 well
C2+, just can make the voltage V on the capacitor C 1
C1Be in the safe handling scope, thereby reach the purpose of protecting load circuit.But this must stabilize to prerequisite with AC-input voltage, if AC-input voltage raises suddenly, the also corresponding increase of the charging current in the control loop one arrives gate trigger voltage V
SCRTime T
C2+Shorten thyristor SCR ON time T
SCRProlong, to the charging interval T on the capacitor C 1
C1Prolong the voltage V on the capacitor C 1
C1So also corresponding increase is the charging interval T that also needs to cooperate control loop two to solve on a pair of capacitor C 1 of control loops
C1Control.
At the positive half cycle that exchanges input in the cycle, diode D2 in the control loop two oppositely ends, control loop two is inoperative, just entered negative half period during the cycle, because negative pressure is less, voltage-stabiliser tube not conducting of TVS and be in high impedance status, only there is very little leakage current in control loop, minimum to the influence of A point voltage, the voltage that A is ordered is constant substantially.Along with the increase of negative voltage, negative voltage surpasses the clamping voltage V of voltage-stabiliser tube TVS
TVSThe time, the impedance of voltage-stabiliser tube TVS reduces immediately, and with voltage clamp on the clamping voltage of voltage-stabiliser tube TVS, in control loop two, form an opposite direction charge circuit to capacitor C 2, the voltage that A is ordered has malleation to become negative pressure, the negative pressure that A is ordered is called V
C2-, the charging interval of C2 is called T
C2-(as shown in figure 10).If AC-input voltage increases (exchange and import the negative pressure increase), the reverse charging electric current increases simultaneously because shift to an earlier date the breakdown time of voltage-stabiliser tube TVS pipe, to the reverse charging time T of capacitor C 2
C2-Increase; C2 causes the A point to form higher negative pressure V because the charging interval prolongs and the increase of charging current
C2-The negative pressure V that the A point forms
C2-Size, influenced loop one and exchanged the positive half cycle of input positive charge time to capacitor C 2 in the cycle, negative pressure V that A is ordered
C2-High more, C2 arrives thyristor SCR triggering and conducting threshold voltage V in positive charge during the time
SCRTime T
C2+Just long more, the ON time T of thyristor SCR so
SCRShorten, thereby minimizing is to the charging interval T of capacitor C 1
C1, the voltage V of capacitor C 1
C1Also decrease, reached protection purpose load.
Otherwise, exchanging the input negative pressure and reduce, the reverse charging electric current reduces simultaneously because postpone the breakdown time of voltage-stabiliser tube TVS, to the reverse charging time T of capacitor C 2
C2-Shorten, capacitor C 2 causes the A point to form lower negative pressure V because the charging interval shortens and charging current reduces
C2-, capacitor C 2 arrives thyristor SCR triggering and conducting threshold voltage V in positive charge during the time so
SCRTime just shorten, thereby increased charging interval T to capacitor C 1
C1, the voltage T of capacitor C 1
C1Also increase, thereby guaranteed that the voltage on the capacitor C 1 is stable.
In general AC-input voltage just; the magnitude of voltage of negative half period equates; because in exchanging the input negative half-cycle; resistance R 1 in the control loop one still works; so to the reverse charging electric current of capacitor C 2 greater than in exchanging the input positive half period to the positive charge electric current of capacitor C 2; the appropriate loop one of selecting; component parameters in the loop two; surpass the safe voltage of regulation when (as greater than 320AC) in AC-input voltage; the voltage that A is ordered is in the positive half period that exchanges input; portion can reach the thyristor threshold voltage; make the thyristor can't conducting; the input circuit of cutting off the electricity supply, thus the safety of load protected.
Control loop one, the two pairs of alternating current input power supplyings in loop have been realized control, the copped wave pressure limiting automatically of each ripple, to unexpected boosting, maximum positive half cycles of conducting, and the voltage of a positive half cycle only, capacitor C 1 and load can digest fully often and be unlikely to damage circuit devcie, have so just guaranteed the safety of load fully.
Embodiment 2:
As shown in Figure 7; provide a kind of single-phase half-wave overvoltage protection and expanded circuit; single-phase half-wave overvoltage protection basic circuit structure basically identical among this line construction and the embodiment 1; but also comprise a diode D3; negative electrode and the resistance R 3 of this diode D3 are in series; its negative electrode links to each other with resistance R 3, and anode links to each other with common.This circuit is compared with embodiment 1, when exchanging the positive half cycle initial period of input, have only when importing positive half cycle voltage greater than the voltage on the capacitor C 1, loop one just begins capacitor C 2 is carried out positive charge, postponed the 2 positive charge times of capacitor C, promptly shortened the ON time of thyristor SCR, reduced charging interval capacitor C 1, the voltage of capacitor C 1 decreases, and has played the effect of protection load; Resistance R 3 is because the reverse blocking of diode D3 is inoperative; When exchanging the input negative half-cycle, diode D3 is in forward condition, and is the same among the reverse charging situation of the two pairs of capacitor C 2 in loop and the embodiment 1.
Embodiment 3:
According to shown in Figure 8, the utility model gives a kind of single-phase full wave overvoltage protection basic circuit.Its line construction is being connected with and overvoltage crowbar 22 between interchange input and load on the line tower foundation of embodiment 2; this single-phase overvoltage crowbar 22 includes thyristor SCR.1; voltage-stabiliser tube TVS.1; resistance R 1.1; resistance R 2.1; resistance R 3.1; diode D1.1; diode D2.1; diode D3.1 and capacitor C 2.1; the anode of this thyristor SCR.1 links to each other with common; its negative electrode links to each other with load end after being connected with the diode D1.1 with thyristor SCR.1 series aiding connection; this voltage-stabiliser tube TVS.1 anode links to each other with the gate pole of thyristor SCR.1; the negative electrode of voltage-stabiliser tube TVS.1 is connected respectively on mutual parallel resistor R1.1 and the resistance R 2.1; resistance R 1.1 directly links to each other with common; resistance R 2.1 by connect with diode D2.1 that voltage-stabiliser tube TVS.1 is provided with in the same way after link to each other with common; capacitor C 2.1 is connected between thyristor SCR.1 negative electrode and the voltage-stabiliser tube TVS.1 anode; resistance R 3.1 is connected with diode D3.1 and is arranged between diode D1.1 anode and the ac input end; the negative electrode of this diode D3.1 links to each other with diode D3.1, and its anode links to each other with ac input end.Its operation principle is with embodiment 1; In embodiment 1 and 2, only when exchanging the positive half cycle of input, just capacitor C 1 is charged, when exchanging the input negative half period, can not charge capacitor C 1.Can both charge to capacitor C 1 at the positive and negative half cycle of interchange input in the present embodiment, the voltage that has improved on the capacitor C 1 is stable.
Embodiment 4:
According to shown in Figure 9, the utility model gives a kind of single-phase full wave overvoltage protection and expands circuit.This circuit comprises overvoltage crowbar 1; between ac input end and load ground end, also be connected with overvoltage crowbar 33; this overvoltage crowbar three comprises thyristor SCR.1; voltage-stabiliser tube TVS.1; resistance R 1.1; resistance R 2.1; capacitor C 2.1 and diode D2.1; the anode of this thyristor SCR.1 links to each other with load ground end; its negative electrode links to each other with ac input end; this voltage-stabiliser tube TVS.1 negative electrode links to each other with the gate pole of thyristor SCR.1; the anode of voltage-stabiliser tube TVS.1 is connected respectively on mutual parallel resistor R1.1 and the resistance R 2.1; resistance R 1.1 directly links to each other with load ground end; resistance R 2.1 links to each other with load ground end after connecting the diode D2.1 that oppositely is provided with voltage-stabiliser tube, and capacitor C 2.1 is connected between thyristor SCR.1 negative electrode and the voltage-stabiliser tube TVS.1 negative electrode.In overvoltage crowbar 1, establish and also be equipped with diode D3.1; this diode D3.1 anode links to each other with common; its negative electrode links to each other with load end; also be provided with diode D3; this diode D3 is connected on common and the load ground end line; the anode of diode D3 is connected with capacitor C 1 negative electrode, and the negative electrode of diode D3 is connected with diode D3.1 anode in the overvoltage crowbar one.This circuit is compared with the single-phase full wave overvoltage protection basic circuit among the embodiment 3; utilized the symmetry of the positive and negative half cycle of alternating current input power supplying; resistance R 3, resistance R 3.1, diode D1, diode D1.1 element have been reduced; reached the function of single-phase full wave overvoltage protection basic circuit equally; simplify circuit, reduced cost.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper has used thyristor SCR morely, the possibility of using other term do not got rid of in terms such as voltage-stabiliser tube TVS, resistance R 1, capacitor C 1, diode D1.Using these terms only is in order to describe and explain essence of the present utility model more easily; They are construed to any additional restriction all is contrary with the utility model spirit.
Claims (8)
1. switch power supply cycle-by-cycle wave over-voltage protection circuit is characterized in that:
Between interchange input and load, be connected with an overvoltage crowbar one, this overvoltage crowbar one includes thyristor, voltage-stabiliser tube, first resistance, second resistance, second diode and second electric capacity, the anode of this thyristor links to each other with ac input end, its negative electrode links to each other with load end, this voltage-stabiliser tube negative electrode links to each other with the gate pole of thyristor, the anode of voltage-stabiliser tube is connected respectively on first resistance and second resistance of mutual parallel connection, first resistance directly links to each other with ac input end, second resistance links to each other with ac input end after connecting second diode that oppositely is provided with voltage-stabiliser tube, and second electric capacity is connected between thyristor negative electrode and the voltage-stabiliser tube negative electrode;
Between load input terminal and load ground end, be connected with first electric capacity.
2. a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit according to claim 1 is characterized in that being provided with first diode that is connected in the same way with thyristor between thyristor negative electrode and load end.
3. a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit according to claim 2 is characterized in that being connected with the 3rd resistance between first diode anode and common.
4. a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit according to claim 3 is characterized in that also comprising the 3rd diode, and the negative electrode of the 3rd diode and the 3rd resistance are in series, and its negative electrode links to each other with the 3rd resistance, and anode links to each other with common.
5. a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit according to claim 4; it is characterized in that between interchange input and load, being connected with and overvoltage crowbar two; this single-phase overvoltage crowbar two includes thyristor; voltage-stabiliser tube; first resistance; second resistance; the 3rd resistance; first diode; second diode; the 3rd diode and second electric capacity; the anode of this thyristor links to each other with common; its negative electrode links to each other with load end after being connected with first diode with the thyristor series aiding connection; this voltage-stabiliser tube anode links to each other with the gate pole of thyristor; the negative electrode of voltage-stabiliser tube is connected respectively on first resistance and second resistance of mutual parallel connection; first resistance directly links to each other with common; second resistance by connect with second diode that voltage-stabiliser tube is provided with in the same way after link to each other with common; second electric capacity is connected between thyristor negative electrode and the voltage-stabiliser tube anode; the 3rd resistance is connected with the 3rd diode and is arranged between first diode anode and the ac input end; the negative electrode of the 3rd diode links to each other with the 3rd diode, and its anode links to each other with ac input end.
6. a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit according to claim 1; it is characterized in that between ac input end and load ground end, being connected with overvoltage crowbar three; this overvoltage crowbar three comprises thyristor; voltage-stabiliser tube; first resistance; second resistance; second electric capacity and second diode; the anode of this thyristor links to each other with load ground end; its negative electrode links to each other with ac input end; this voltage-stabiliser tube negative electrode links to each other with the gate pole of thyristor; the anode of voltage-stabiliser tube is connected respectively on first resistance and second resistance of mutual parallel connection; first resistance directly links to each other with load ground end; second resistance links to each other with load ground end after connecting second diode that oppositely is provided with voltage-stabiliser tube, and second electric capacity is connected between thyristor negative electrode and the voltage-stabiliser tube negative electrode.
7. a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit according to claim 6 is characterized in that being provided with the 3rd diode in overvoltage crowbar one, and this diode anode links to each other with common, and its negative electrode links to each other with load end.
8. a kind of switch power supply cycle-by-cycle wave over-voltage protection circuit according to claim 7; it is characterized in that also being provided with the 3rd diode; the 3rd diode is connected on common and the load ground end line; the anode of the 3rd diode is connected with first capacitance cathode, and the negative electrode of the 3rd diode is connected with the 3rd diode anode in the overvoltage crowbar one
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203038725U CN201345534Y (en) | 2008-12-30 | 2008-12-30 | Switch power supply cycle-by-cycle overvoltage protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203038725U CN201345534Y (en) | 2008-12-30 | 2008-12-30 | Switch power supply cycle-by-cycle overvoltage protective circuit |
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| CN201345534Y true CN201345534Y (en) | 2009-11-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124413A1 (en) * | 2009-04-28 | 2010-11-04 | Lu Dongfang | Cycle-by-cycle over voltage protection circuit for switching power supply |
| CN101699686B (en) * | 2009-11-19 | 2012-06-06 | 中兴通讯股份有限公司 | Protection device of switch power supply and method thereof |
-
2008
- 2008-12-30 CN CNU2008203038725U patent/CN201345534Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124413A1 (en) * | 2009-04-28 | 2010-11-04 | Lu Dongfang | Cycle-by-cycle over voltage protection circuit for switching power supply |
| CN101699686B (en) * | 2009-11-19 | 2012-06-06 | 中兴通讯股份有限公司 | Protection device of switch power supply and method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20091111 Effective date of abandoning: 20081230 |