CN203774767U - Cut-off type fault protection circuit of unity power factor boost converter - Google Patents
Cut-off type fault protection circuit of unity power factor boost converter Download PDFInfo
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- CN203774767U CN203774767U CN201420198455.4U CN201420198455U CN203774767U CN 203774767 U CN203774767 U CN 203774767U CN 201420198455 U CN201420198455 U CN 201420198455U CN 203774767 U CN203774767 U CN 203774767U
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Abstract
The utility model discloses a cut-off type fault protection circuit of a unity power factor boost converter. The fault protection circuit comprises relay for controlling connection or disconnection of a unity power factor boost converter and an alternating-current power supply, an over-current detection circuit, a fault holding circuit, and a relay drive circuit, wherein the over-current detection circuit, the fault holding circuit, and the relay drive circuit are successively connected. The input terminal of the over-current detection circuit is connected with the output terminal of the unity power factor boost converter; the coil of the relay is connected with the relay drive circuit; a contact switch of the relay is connected in series between an alternating-current input terminal and an alternating-current power supply of a rectification bridge of the unity power factor boost converter. According to the scheme, the circuit with the simple structure can be used and operated conveniently; the over-current protection is timely and reliable; the recovery function can be realized; and the unity power factor boost converter can be protected from being damaged when a short circuit phenomenon occurs at the output. Moreover, the circuit with high practicability and good using effect can be promoted and used conveniently.
Description
Technical field
The utility model belongs to the fault secure circuit technical field of boost converter, specifically relates to a kind of cut-off type fault secure circuit of unity power factor boost converter.
Background technology
In recent years, along with the development of electronic technology, the extensive use of power electronic product, causes serious harmonic pollution to electrical network.Existence due to some non-linear elements in converter, although it is sinusoidal causing the alternating voltage of input, but the alternating current of output seriously distorts, comprise a large amount of harmonic waves, not only reduced the power factor of input circuit, and public power system is produced and polluted, cause fault, the normal use that the EMC (Electro Magnetic Compatibility) that the harmonic current that inductive load produces brings and THD (total harmonic distortion) problem have had a strong impact on equipment.Unity power factor is proofreaied and correct boost converter and in order to reach enough large power output, is made again enough little of output voltage ripple; the output of converter includes filter inductance and the nonpolar electric capacity that capacity is larger conventionally; if protective circuit thorough energy source of power cutoff input when unity power factor boost converter breaks down in addition; once there is the faults such as overcurrent, the energy potential of its generation must threaten the safety of each power consumption equipment.Therefore; for converter or other electronic product can be used safely; just must in unity power factor boost converter, adopt fault secure circuit; thoroughly to block the energy source at output overcurrent place; guarantee that converter or other electronic product, when output is broken down, can not cause the damage of other electronic products.Due to boost converter circuit, when output overcurrent, even cut-off switch pipe, input energy still can arrive output by inductance and diode, output will still have energy output, can not thoroughly block the energy source at output overcurrent place, guarantee the safety of converter or other electronic product.The resist technology that unity power factor boost converter is taked at present or the alternative of protective circuit: 1, for full-control type device: 1. a kind of is after AC-DC rectifier bridge, to add a PMOS pipe, as shown in Figure 5.By controlling the height of its gate-source voltage, control conducting and the shutoff of PMOS pipe, to realize, block output energy source, reach the object that guarantees converter or other electronic product safety.But under normal circumstances, while there is negative voltage between PMOS grid source electrode, switch is just understood conducting, and source voltage will change within the scope of 0 to 380V, does not have negative voltage when source potential near zero-crossing point between grid source electrode, switch cannot conducting, therefore PMOS pipe is difficult to realize.In like manner, with the triode of a PNP can not meet the demands (during emitter voltage near zero-crossing point triode can not conducting).2. a kind of is after AC-DC rectifier bridge, to add a NMOS pipe.Between grid source electrode, need to add forward bias voltage, control circuit and main circuit need isolation, and design is complicated, and cost is higher.In like manner, with the triode of a NPN, exist equally between base stage and emitter-base bandgap grading and need to add forward bias voltage and isolating problem, be difficult to realize.3. a kind of is after AC-DC rectifier bridge, to add an IGBT., there is equally forward bias and isolating problem in just conducting of IGBT owing to being greater than the cut-in voltage of MOSFET when IGBT grid forward voltage and emitter forward pressure reduction, and design is complicated.2, solid-state switch: its high life, reliability is high, highly sensitive, power ratio control is little, Electro Magnetic Compatibility is good, switch speed is fast, and electromagnetic interference is little, but the tube voltage drop after conducting is large, power consumption and caloric value are also large, the volume of high power solid state relay is far longer than the electromagnetic relay of same capacity, cost is also higher, and semiconductor device closes to have no progeny and still can have the leakage current of several microamperes to several milliamperes, the electricity isolation that can not realize ideal, in addition, solid-state relay is loaded with larger sensitiveness to crossing, must to it, carry out overload protection by fast acting fuse or RC antihunt circuit, the load of solid-state relay is obviously relevant with ambient temperature, and temperature raises, and load capacity will decline rapidly.3, optocoupler bidirectional triode thyristor: it has that volume is little, lightweight, efficiency is high and the advantage such as easy to use, but its overload and poor anti jamming capability, the overcurrent-overvoltage of short time all can cause component wear, need to adopt absorbing circuit over-voltage suppression spike, and can disturb the shortcomings such as electrical network and self-interference when controlling large inductive load.So, in the time of need to designing a kind of output and occur over current fault, can thoroughly cut off the electricity supply, recoverable protective circuit again, to reach the requirement that guarantees converter or other electronic product safety.At present, for Limited Current wave distortion and harmonic wave, reduce the pollution of harmonic wave to AC network, make electromagnetic environment cleaner, power factor correction (PFC) technology that adopts modern HF power conversion technology is to solve the most effective means of harmonic pollution.Therefore it is significant that, design is applicable to the protective circuit of unity power factor boost converter output overcurrent protection.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art; a kind of cut-off type fault secure circuit of unity power factor boost converter is provided; it is simple in structure; use simple operation, overcurrent protection is reliable in time, has restore funcitons; can guarantee that unity power factor boost converter can not be damaged when short circuit appears in output; practical, result of use is good, is convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of cut-off type fault secure circuit of unity power factor boost converter, it is characterized in that: comprise the relay being switched on or switched off for controlling unity power factor boost converter and AC power, and the over-current detection circuit connecting successively, fault holding circuit and relay drive circuit, the output of the input of described over-current detection circuit and unity power factor boost converter joins, coil and the relay drive circuit of described relay join, the contact switch of described relay is connected between the ac input end and AC power of rectifier bridge in unity power factor boost converter.
The cut-off type fault secure circuit of above-mentioned unity power factor boost converter, is characterized in that: described over-current detection circuit is by comparator chip LM393, reference voltage source chip TL431, and resistance R 1, R2, R3 and R4 form, the input IN that the 6th pin of described comparator chip LM393 is over-current detection circuit, the 5th pin of described comparator chip LM393 and the sampling end of reference voltage source chip TL431 joins and by resistance R 4 ground connection, the control end of described reference voltage source chip TL431 joins with the output VCC of 18V power supply by resistance R 3, the earth terminal ground connection of described reference voltage source chip TL431, the output that the 7th pin of described comparator chip LM393 is over-current detection circuit and joining by resistance R 2 and the 5th pin of comparator chip LM393, the 8th pin of described comparator chip LM393 and the output VCC of 18V power supply joins and join by resistance R 1 and the 7th pin of comparator chip LM393, the 4th pin ground connection of described comparator chip LM393.
The cut-off type fault secure circuit of above-mentioned unity power factor boost converter, is characterized in that: described fault holding circuit is by 555 timer chips, nonpolar capacitor C 1, C2 and C3, and resistance R 5 and R7 form, pin 1 ground connection of described 555 timer chips, the pin 2 of described 555 timer chips joins for the input of fault holding circuit and with the output of over-current detection circuit, the pin 3 of described 555 timer chips is the output of fault holding circuit, the output VCC of the pin 4 of described 555 timer chips by resistance R 5 and 18V power supply joins and by nonpolar capacitor C 2 ground connection, the pin 5 of described 555 timer chips is by nonpolar capacitor C 1 ground connection, the pin 6 of described 555 timer chips and pin 7 are all by nonpolar capacitor C 3 ground connection, the pin 8 of described 555 timer chips joins with the output VCC of 18V power supply and pin 6 and pin 7 by resistance R 7 and 555 timer chips join.
The cut-off type fault secure circuit of above-mentioned unity power factor boost converter, is characterized in that: described relay is relay Q3F-1Z, and described relay drive circuit is comprised of resistance R 6 and voltage stabilizing didoe D1; One end of described resistance R 6 is the input of relay drive circuit and joins with the output of fault holding circuit, the pin 4 of the negative electrode of the other end of described resistance R 6 and voltage stabilizing didoe D1 and relay Q3F-1Z joins, the equal ground connection of pin 5 of the anode of described voltage stabilizing didoe D1 and relay Q3F-1Z, the pin 1 of described relay Q3F-1Z and pin 2 are connected between the ac input end and AC power of rectifier bridge in unity power factor boost converter.
The cut-off type fault secure circuit of above-mentioned unity power factor boost converter, is characterized in that: described fault holding circuit is by monostable flipflop chip CD4098, nonpolar capacitor C 4 and C5, and resistance R 8 and R9 form; the pin 1 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by nonpolar capacitor C 4 and the resistance R 8 of series connection, the pin 2 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by resistance R 8, the pin 3 of described monostable flipflop chip CD4098, pin 5, pin 13 and pin 16 all join with the output VCC of 18V power supply, the pin 4 of described monostable flipflop chip CD4098 joins for the input of fault holding circuit and with the output of over-current detection circuit, the pin 6 of described monostable flipflop chip CD4098 joins with the pin 11 of monostable flipflop chip CD4098, the pin 8 of described monostable flipflop chip CD4098 and pin 12 all join with the output VSS of 2.5V power supply, the pin 10 of described monostable flipflop chip CD4098 is the output of fault holding circuit, the pin 14 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by resistance R 9, the pin 15 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by nonpolar capacitor C 5 and the resistance R 9 of series connection.
The cut-off type fault secure circuit of above-mentioned unity power factor boost converter, it is characterized in that: described relay is relay Q3F-1Z, described relay drive circuit is by resistance R 10, triode Q1 and voltage stabilizing didoe D2 form, one end of described resistance R 10 is the input of relay drive circuit and joins with the output of fault holding circuit, the base stage of the other end of described resistance R 10 and triode Q1 is joined, the output VCC of the collector electrode of described triode Q1 and 18V power supply joins, the pin 4 of the negative electrode of the emitter of described triode Q1 and voltage stabilizing didoe D2 and relay Q3F-1Z joins, the equal ground connection of pin 5 of the anode of described voltage stabilizing didoe D2 and relay Q3F-1Z, the pin 1 of described relay Q3F-1Z and pin 2 are connected between the ac input end and AC power of rectifier bridge in unity power factor boost converter.
The cut-off type fault secure circuit of above-mentioned unity power factor boost converter, is characterized in that: described unity power factor boost converter is by full-bridge rectification bridge D, and NMOS manages VT1, inductance L 1, nonpolar capacitor C 6, polar capacitor C7, rectifier diode D0, and resistance R 11 and R12 composition; ac input end of described full-bridge rectification bridge D and an output terminals A C1 of AC power join, another ac input end of described full-bridge rectification bridge D joins by the contact switch of relay and another output terminals A C2 of AC power, the anodal DC voltage output end of described full-bridge rectification bridge D joins by inductance L 1 and the anode of rectifier diode D0 and the drain electrode of NMOS pipe VT1, the positive pole of one end of the negative electrode of described rectifier diode D0 and nonpolar capacitor C 6 and polar capacitor C7 joins and is the cathode voltage output DC+ of unity power factor boost converter, the grid of described NMOS pipe VT1 is the pwm control signal input of unity power factor boost converter and passes through resistance R 11 ground connection, the negative pole DC voltage output end of described full-bridge rectification bridge D, the source electrode of NMOS pipe VT1, the other end of nonpolar capacitor C 6, the equal ground connection in one end of the negative pole of polar capacitor C7 and resistance R 12, the other end of described resistance R 12 is the cathode voltage output DC-of unity power factor boost converter, the cathode voltage output DC-of the input of described over-current detection circuit and unity power factor boost converter joins.
The utility model compared with prior art has the following advantages:
1, the utility model circuit structure is simple, reasonable in design, easy-to-connect.
2, the use simple operation of the utility model in unity power factor boost converter, overcurrent protection is reliable in time.
3, the utility model is when there is over current fault in unity power factor boost converter, can thoroughly cut off the electricity supply, so that the energy limited of output is arrived to enough low scope, the safety of guarantor unit's power factor boost converter when overcurrent appears in output, has again restore funcitons.
4, the utility model, by fault holding circuit is set, can prevent relay generation misoperation, has improved functional reliability of the present utility model.
5, the utility model can be applied in unity power factor boost converter or associated electrical product, can guarantee that unity power factor boost converter can not be damaged when short circuit appears in output, improved the coefficient of safety of unity power factor boost converter, unity power factor boost converter can be applied safely, can not reduce the efficiency of unity power factor boost converter, practical, result of use is good, is convenient to promote the use of.
In sum, the utility model is simple in structure, uses simple operation; overcurrent protection is reliable in time, has restore funcitons, can guarantee that unity power factor boost converter can not be damaged when short circuit appears in output; practical, result of use is good, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model the first embodiment.
Fig. 3 is the circuit theory diagrams of the utility model the second embodiment.
Fig. 4 is use view of the present utility model.
Fig. 5 adds the protective circuit figure of a PMOS pipe after AC-DC rectifier bridge in prior art.
Description of reference numerals:
1-over-current detection circuit; 2-fault holding circuit; 3-relay drive circuit;
4-relay; 5-unity power factor boost converter;
6-AC power.
Embodiment
Embodiment 1
As shown in Figure 1, the utility model comprises the relay 4 being switched on or switched off for controlling unity power factor boost converter 5 and AC power 6, and the over-current detection circuit 1, fault holding circuit 2 and the relay drive circuit 3 that connect successively, the output of the input of described over-current detection circuit 1 and unity power factor boost converter 5 joins, the coil of described relay 4 and relay drive circuit 3 join, and the contact switch of described relay 4 is connected between the ac input end and AC power 6 of rectifier bridge in unity power factor boost converter 5.
As shown in Figure 2, in the present embodiment, described over-current detection circuit 1 is by comparator chip LM393, reference voltage source chip TL431, and resistance R 1, R2, R3 and R4 form, the 6th pin of described comparator chip LM393 is the input IN of over-current detection circuit 1, the 5th pin of described comparator chip LM393 and the sampling end of reference voltage source chip TL431 joins and by resistance R 4 ground connection, the control end of described reference voltage source chip TL431 joins with the output VCC of 18V power supply by resistance R 3, the earth terminal ground connection of described reference voltage source chip TL431, the 7th pin of described comparator chip LM393 is the output of over-current detection circuit 1 and joins by resistance R 2 and the 5th pin of comparator chip LM393, the 8th pin of described comparator chip LM393 and the output VCC of 18V power supply joins and join by resistance R 1 and the 7th pin of comparator chip LM393, the 4th pin ground connection of described comparator chip LM393.
As shown in Figure 2, in the present embodiment, described fault holding circuit 2 is by 555 timer chips, nonpolar capacitor C 1, C2 and C3, and resistance R 5 and R7 form, pin 1 ground connection of described 555 timer chips, the pin 2 of described 555 timer chips joins for the input of fault holding circuit 2 and with the output of over-current detection circuit 1, the pin 3 of described 555 timer chips is the output of fault holding circuit 2, the output VCC of the pin 4 of described 555 timer chips by resistance R 5 and 18V power supply joins and by nonpolar capacitor C 2 ground connection, the pin 5 of described 555 timer chips is by nonpolar capacitor C 1 ground connection, the pin 6 of described 555 timer chips and pin 7 are all by nonpolar capacitor C 3 ground connection, the pin 8 of described 555 timer chips joins with the output VCC of 18V power supply and pin 6 and pin 7 by resistance R 7 and 555 timer chips join.By fault holding circuit 2 is set, can prevent that relay 4 from misoperation occurring, and has improved functional reliability of the present utility model.
As shown in Figure 2, in the present embodiment, described relay 4 is relay Q3F-1Z, and described relay drive circuit 3 is comprised of resistance R 6 and voltage stabilizing didoe D1; One end of described resistance R 6 is the input of relay drive circuit 3 and joins with the output of fault holding circuit 2, the pin 4 of the negative electrode of the other end of described resistance R 6 and voltage stabilizing didoe D1 and relay Q3F-1Z joins, the equal ground connection of pin 5 of the anode of described voltage stabilizing didoe D1 and relay Q3F-1Z, the pin 1 of described relay Q3F-1Z and pin 2 are connected between the ac input end and AC power 6 of rectifier bridge in unity power factor boost converter 5.Wherein, the pin 4 of relay Q3F-1Z and pin 5 be two pins of the coil of relay Q3F-1Z respectively, the pin 1 of relay Q3F-1Z is the common pin of relay Q3F-1Z, and the pin 2 of relay Q3F-1Z is the normally-closed contact pin of relay Q3F-1Z.
In conjunction with Fig. 4, in the present embodiment, described unity power factor boost converter 5 is by full-bridge rectification bridge D, and NMOS manages VT1, inductance L 1, nonpolar capacitor C 6, polar capacitor C7, rectifier diode D0, and resistance R 11 and R12 composition; ac input end of described full-bridge rectification bridge D and an output terminals A C1 of AC power 6 join, another ac input end of described full-bridge rectification bridge D joins by the contact switch of relay 4 and another output terminals A C2 of AC power 6, the anodal DC voltage output end of described full-bridge rectification bridge D joins by inductance L 1 and the anode of rectifier diode D0 and the drain electrode of NMOS pipe VT1, the positive pole of one end of the negative electrode of described rectifier diode D0 and nonpolar capacitor C 6 and polar capacitor C7 joins and is the cathode voltage output DC+ of unity power factor boost converter 5, the grid of described NMOS pipe VT1 is the pwm control signal input of unity power factor boost converter 5 and passes through resistance R 11 ground connection, the negative pole DC voltage output end of described full-bridge rectification bridge D, the source electrode of NMOS pipe VT1, the other end of nonpolar capacitor C 6, the equal ground connection in one end of the negative pole of polar capacitor C7 and resistance R 12, the other end of described resistance R 12 is the cathode voltage output DC-of unity power factor boost converter 5, the cathode voltage output DC-of the input of described over-current detection circuit 1 and unity power factor boost converter 5 joins.
In the present embodiment, operation principle of the present utility model is: over-current detection circuit 1 is converted to the current signal detecting after voltage signal, by detecting sampled voltage, judge whether over current fault occurs, when sampled voltage being detected over a certain set point, be judged to be overcurrent has occurred, by over-current detection circuit 1, send signal, this signal is transferred to relay drive circuit 3 by fault holding circuit after 2 time delay a period of times, after time delay during this period of time, if over current fault is eliminated, unity power factor boost converter 5 keeps normal operating conditions, after time delay during this period of time, if over current fault is not eliminated, relay 4 actions, unity power factor boost converter 5 and AC power 6 are disconnected, thereby output overcurrent place is thoroughly isolated from the energy of input ac power 6, the utility model can guarantee that unity power factor boost converter 5 can not be damaged when short circuit appears in output, improved the coefficient of safety of unity power factor boost converter 5, unity power factor boost converter 5 can be applied safely, can not reduce the efficiency of unity power factor boost converter 5, and there is restore funcitons.
Particularly, reference voltage source chip TL431 and resistance R 3 and R4 have formed reference voltage circuit, making the voltage in resistance R 4 is 2.5V, reference voltage using the voltage in resistance R 4 as described comparator chip LM393, during the 5 normal work of unity power factor boost converter, sampled voltage is lower than the reference voltage of comparator chip LM393, described comparator chip LM393 is output as high level, the input pin 2 that is described 555 timer chips is high level, fault holding circuit 2 is failure to actuate, the output output low level of fault holding circuit 2, relay drive circuit 3 is failure to actuate, the contact switch of relay Q3F-1Z keeps normally off, unity power factor boost converter 5 keeps the state of connecting with AC power 6, unity power factor boost converter 5 continues normal work, when the output of unity power factor boost converter 5 has output overcurrent fault to occur, once sampled voltage is higher than the reference voltage of comparator chip LM393, described comparator chip LM393 is output as low level, the input pin 2 that is described 555 timer chips is low level, 2 actions of fault holding circuit, through nonpolar capacitor C 1, C2 and C3, and after the time-lag action of resistance R 5 and R7, the output output high level of fault holding circuit 2, it is off-state by normally off action that relay drive circuit 3 drives the contact switch of relay Q3F-1Z, unity power factor boost converter 5 and AC power 6 are disconnected, output overcurrent place is thoroughly isolated from the energy of input ac power 6, the energy at output overcurrent place only has inductance L 1, the energy of nonpolar capacitor C 6 and polar capacitor C7.
Embodiment 2
As shown in Figure 3, the structure of the present embodiment as different from Example 1: described fault holding circuit 2 is by monostable flipflop chip CD4098, nonpolar capacitor C 4 and C5, and resistance R 8 and R9 form; the pin 1 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by nonpolar capacitor C 4 and the resistance R 8 of series connection, the pin 2 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by resistance R 8, the pin 3 of described monostable flipflop chip CD4098, pin 5, pin 13 and pin 16 all join with the output VCC of 18V power supply, the pin 4 of described monostable flipflop chip CD4098 joins for the input of fault holding circuit 2 and with the output of over-current detection circuit 1, the pin 6 of described monostable flipflop chip CD4098 joins with the pin 11 of monostable flipflop chip CD4098, the pin 8 of described monostable flipflop chip CD4098 and pin 12 all join with the output VSS of 2.5V power supply, the pin 10 of described monostable flipflop chip CD4098 is the output of fault holding circuit 2, the pin 14 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by resistance R 9, the pin 15 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by nonpolar capacitor C 5 and the resistance R 9 of series connection.Described relay drive circuit 3 is by resistance R 10, triode Q1 and voltage stabilizing didoe D2 form, one end of described resistance R 10 is the input of relay drive circuit 3 and joins with the output of fault holding circuit 2, the base stage of the other end of described resistance R 10 and triode Q1 is joined, the output VCC of the collector electrode of described triode Q1 and 18V power supply joins, the pin 4 of the negative electrode of the emitter of described triode Q1 and voltage stabilizing didoe D2 and relay Q3F-1Z joins, the equal ground connection of pin 5 of the anode of described voltage stabilizing didoe D2 and relay Q3F-1Z, the pin 1 of described relay Q3F-1Z and pin 2 are connected between the ac input end and AC power 6 of rectifier bridge in unity power factor boost converter 5.All the other structures are all identical with embodiment 1.
In the present embodiment, because the output current of monostable flipflop chip CD4098 is too small, be not enough to drive relay Q3F-1Z action, thus on the basis of embodiment 1 repeat circuit drive circuit 3, added a NPN type triode Q1, to increase the drive current of relay drive circuit 3.
The operation principle of the present embodiment is as different from Example 1: during the 5 normal work of unity power factor boost converter, described comparator chip LM393 is output as high level, the input pin 4 that is described monostable flipflop chip CD4098 is high level, fault holding circuit 2 is failure to actuate, the output output low level of fault holding circuit 2, relay drive circuit 3 is failure to actuate, the contact switch of relay Q3F-1Z keeps normally off, unity power factor boost converter 5 keeps the state of connecting with AC power 6, unity power factor boost converter 5 continues normal work, when the output of unity power factor boost converter 5 has output overcurrent fault to occur, described comparator chip LM393 is output as low level, the input pin 4 that is described monostable flipflop chip CD4098 is low level, 2 actions of fault holding circuit, through nonpolar capacitor C 4 and C5, and after the time-lag action of resistance R 8 and R9, the output output high level of fault holding circuit 2, after triode Q1, the drive current of relay drive circuit 3 is amplified, it is off-state by normally off action that relay drive circuit 3 drives the contact switch of relay Q3F-1Z, unity power factor boost converter 5 and AC power 6 are disconnected, output overcurrent place is thoroughly isolated from the energy of input ac power 6, the energy at output overcurrent place only has inductance L 1, the energy of nonpolar capacitor C 6 and polar capacitor C7.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every any simple modification of above embodiment being done according to the utility model technical spirit, change and equivalent structure change, and all still belong in the protection range of technical solutions of the utility model.
Claims (7)
1. the cut-off type fault secure circuit of a unity power factor boost converter, it is characterized in that: comprise the relay (4) being switched on or switched off for controlling unity power factor boost converter (5) and AC power (6), and the over-current detection circuit (1) connecting successively, fault holding circuit (2) and relay drive circuit (3), the output of the input of described over-current detection circuit (1) and unity power factor boost converter (5) joins, the coil of described relay (4) and relay drive circuit (3) join, the contact switch of described relay (4) is connected between the ac input end and AC power (6) of rectifier bridge in unity power factor boost converter (5).
2. according to the cut-off type fault secure circuit of unity power factor boost converter claimed in claim 1, it is characterized in that: described over-current detection circuit (1) is by comparator chip LM393, reference voltage source chip TL431, and resistance R 1, R2, R3 and R4 form, the 6th pin of described comparator chip LM393 is the input IN of over-current detection circuit (1), the 5th pin of described comparator chip LM393 and the sampling end of reference voltage source chip TL431 joins and by resistance R 4 ground connection, the control end of described reference voltage source chip TL431 joins with the output VCC of 18V power supply by resistance R 3, the earth terminal ground connection of described reference voltage source chip TL431, the 7th pin of described comparator chip LM393 is the output of over-current detection circuit (1) and joins by resistance R 2 and the 5th pin of comparator chip LM393, the 8th pin of described comparator chip LM393 and the output VCC of 18V power supply joins and join by resistance R 1 and the 7th pin of comparator chip LM393, the 4th pin ground connection of described comparator chip LM393.
3. according to the cut-off type fault secure circuit of unity power factor boost converter claimed in claim 1, it is characterized in that: described fault holding circuit (2) is by 555 timer chips, nonpolar capacitor C 1, C2 and C3, and resistance R 5 and R7 form, pin 1 ground connection of described 555 timer chips, the pin 2 of described 555 timer chips joins for the input of fault holding circuit (2) and with the output of over-current detection circuit (1), the pin 3 of described 555 timer chips is the output of fault holding circuit (2), the output VCC of the pin 4 of described 555 timer chips by resistance R 5 and 18V power supply joins and by nonpolar capacitor C 2 ground connection, the pin 5 of described 555 timer chips is by nonpolar capacitor C 1 ground connection, the pin 6 of described 555 timer chips and pin 7 are all by nonpolar capacitor C 3 ground connection, the pin 8 of described 555 timer chips joins with the output VCC of 18V power supply and pin 6 and pin 7 by resistance R 7 and 555 timer chips join.
4. according to the cut-off type fault secure circuit of unity power factor boost converter claimed in claim 3, it is characterized in that: described relay (4) is relay Q3F-1Z, and described relay drive circuit (3) is comprised of resistance R 6 and voltage stabilizing didoe D1; One end of described resistance R 6 is the input of relay drive circuit (3) and joins with the output of fault holding circuit (2), the pin 4 of the negative electrode of the other end of described resistance R 6 and voltage stabilizing didoe D1 and relay Q3F-1Z joins, the equal ground connection of pin 5 of the anode of described voltage stabilizing didoe D1 and relay Q3F-1Z, the pin 1 of described relay Q3F-1Z and pin 2 are connected between the ac input end and AC power (6) of rectifier bridge in unity power factor boost converter (5).
5. according to the cut-off type fault secure circuit of unity power factor boost converter claimed in claim 1, it is characterized in that: described fault holding circuit (2) is by monostable flipflop chip CD4098, nonpolar capacitor C 4 and C5, and resistance R 8 and R9 composition; the pin 1 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by nonpolar capacitor C 4 and the resistance R 8 of series connection, the pin 2 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by resistance R 8, the pin 3 of described monostable flipflop chip CD4098, pin 5, pin 13 and pin 16 all join with the output VCC of 18V power supply, the pin 4 of described monostable flipflop chip CD4098 joins for the input of fault holding circuit (2) and with the output of over-current detection circuit (1), the pin 6 of described monostable flipflop chip CD4098 joins with the pin 11 of monostable flipflop chip CD4098, the pin 8 of described monostable flipflop chip CD4098 and pin 12 all join with the output VSS of 2.5V power supply, the pin 10 of described monostable flipflop chip CD4098 is the output of fault holding circuit (2), the pin 14 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by resistance R 9, the pin 15 of described monostable flipflop chip CD4098 joins with the output VCC of 18V power supply by nonpolar capacitor C 5 and the resistance R 9 of series connection.
6. according to the cut-off type fault secure circuit of unity power factor boost converter claimed in claim 5, it is characterized in that: described relay (4) is relay Q3F-1Z, described relay drive circuit (3) is by resistance R 10, triode Q1 and voltage stabilizing didoe D2 form, one end of described resistance R 10 is the input of relay drive circuit (3) and joins with the output of fault holding circuit (2), the base stage of the other end of described resistance R 10 and triode Q1 is joined, the output VCC of the collector electrode of described triode Q1 and 18V power supply joins, the pin 4 of the negative electrode of the emitter of described triode Q1 and voltage stabilizing didoe D2 and relay Q3F-1Z joins, the equal ground connection of pin 5 of the anode of described voltage stabilizing didoe D2 and relay Q3F-1Z, the pin 1 of described relay Q3F-1Z and pin 2 are connected between the ac input end and AC power (6) of rectifier bridge in unity power factor boost converter (5).
7. according to the cut-off type fault secure circuit of unity power factor boost converter claimed in claim 1, it is characterized in that: described unity power factor boost converter (5) is by full-bridge rectification bridge D, NMOS manages VT1, inductance L 1, nonpolar capacitor C 6, polar capacitor C7, rectifier diode D0, and resistance R 11 and R12 composition; ac input end of described full-bridge rectification bridge D and an output terminals A C1 of AC power (6) join, another ac input end of described full-bridge rectification bridge D joins by the contact switch of relay (4) and another output terminals A C2 of AC power (6), the anodal DC voltage output end of described full-bridge rectification bridge D joins by inductance L 1 and the anode of rectifier diode D0 and the drain electrode of NMOS pipe VT1, the positive pole of one end of the negative electrode of described rectifier diode D0 and nonpolar capacitor C 6 and polar capacitor C7 joins and is the cathode voltage output DC+ of unity power factor boost converter (5), the grid of described NMOS pipe VT1 is the pwm control signal input of unity power factor boost converter (5) and passes through resistance R 11 ground connection, the negative pole DC voltage output end of described full-bridge rectification bridge D, the source electrode of NMOS pipe VT1, the other end of nonpolar capacitor C 6, the equal ground connection in one end of the negative pole of polar capacitor C7 and resistance R 12, the other end of described resistance R 12 is the cathode voltage output DC-of unity power factor boost converter (5), the cathode voltage output DC-of the input of described over-current detection circuit (1) and unity power factor boost converter (5) joins.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420198455.4U CN203774767U (en) | 2014-04-22 | 2014-04-22 | Cut-off type fault protection circuit of unity power factor boost converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420198455.4U CN203774767U (en) | 2014-04-22 | 2014-04-22 | Cut-off type fault protection circuit of unity power factor boost converter |
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| CN203774767U true CN203774767U (en) | 2014-08-13 |
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| CN201420198455.4U Expired - Fee Related CN203774767U (en) | 2014-04-22 | 2014-04-22 | Cut-off type fault protection circuit of unity power factor boost converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201912A (en) * | 2014-08-15 | 2014-12-10 | 京东方科技集团股份有限公司 | Alternating current-direct current (AC-DC) converter, power panel and display device |
| CN113871253A (en) * | 2021-10-15 | 2021-12-31 | 深圳英飞源技术有限公司 | Relay tensile arc circuit and control method |
| EP3879655A4 (en) * | 2018-09-29 | 2022-10-12 | Hangzhou Leaderway Electronics Co., Ltd | Pfc overcurrent protection circuit, and controller |
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2014
- 2014-04-22 CN CN201420198455.4U patent/CN203774767U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201912A (en) * | 2014-08-15 | 2014-12-10 | 京东方科技集团股份有限公司 | Alternating current-direct current (AC-DC) converter, power panel and display device |
| US20160260397A1 (en) * | 2014-08-15 | 2016-09-08 | Boe Technology Group Co., Ltd. | Alternating Current-Direct Current Converter, Power Supply Board and Display Apparatus |
| CN104201912B (en) * | 2014-08-15 | 2017-12-26 | 京东方科技集团股份有限公司 | A kind of AC DC converters, power panel and display device |
| US10026372B2 (en) * | 2014-08-15 | 2018-07-17 | Boe Technology Group Co., Ltd. | Alternating current-direct current converter, power supply board and display apparatus |
| EP3879655A4 (en) * | 2018-09-29 | 2022-10-12 | Hangzhou Leaderway Electronics Co., Ltd | Pfc overcurrent protection circuit, and controller |
| CN113871253A (en) * | 2021-10-15 | 2021-12-31 | 深圳英飞源技术有限公司 | Relay tensile arc circuit and control method |
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