CN208352968U - A kind of PFC overvoltage crowbar and device - Google Patents
A kind of PFC overvoltage crowbar and device Download PDFInfo
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- CN208352968U CN208352968U CN201820942647.XU CN201820942647U CN208352968U CN 208352968 U CN208352968 U CN 208352968U CN 201820942647 U CN201820942647 U CN 201820942647U CN 208352968 U CN208352968 U CN 208352968U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a kind of PFC overvoltage crowbar and devices; the circuit includes rectification filtering module, control module, PFC overvoltage protective module, PFC boost module and energy-storage module; input ac power is converted to direct current through the rectification filtering module; the control module control PFC boost module is opened, and direct current output to energy-storage module after PFC boost module boosting stores；When the voltage of PFC boost module output is greater than the first predeterminated voltage; the PFC overvoltage protective module is connected so that control module is closed; control PFC boost module from service; to ensure that PFC voltage within the scope of safe clearance; efficiently solve brought security risk when PFC electric voltage over press, it is ensured that power safety operation.
Description
Technical field
The utility model relates to power protection field, in particular to a kind of PFC overvoltage crowbar and device.
Background technique
With the development of society, awareness of saving energy, troxerutine tabtets are increasingly by the attention of the majority of consumers.The development of science and technology
Also pushed TV to intelligentized forward position highland, smart television is equipped with the intelligent operating system of high performance chips and exploitation,
As the video and audio terminal application platform that home audio-visual, the functions such as amusement, study, life auxiliary become one.And TV
Energy supply end of the power supply as television set, stable operation are the premises for guaranteeing all functions of TV and showing in front of the user
Condition.
Existing PFC power source design mostly uses the PFC power management function IC of NXP company, power supply IC scheme have to
Machine is low in energy consumption, the advantage stable, peripheral circuit is simple, at low cost, but due to the PFC IC of power supply IC scheme and
LLC IC is powered using with supply voltage all the way, if rear end feedback regulation is not in time when over-voltage occurs, will cause LLC input
Voltage increases, and influences the normal operation of LLC, serious to will cause MOS switch pipe damage of the energy storage electrolysis damage with LLC circuit,
The program uses so that circuit becomes complicated simultaneously, increases power supply cost and the design difficulty of PCB.
Thus the prior art could be improved and improve.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide a kind of PFC overvoltage protection electricity
Road and device, the PFC overvoltage crowbar can be effectively solved brought security risk when PFC electric voltage over press, in turn
Ensure that power good is run, and circuit structure is simple, reduces power supply cost.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of PFC overvoltage crowbar, including rectification filtering module, control module, PFC overvoltage protective module, PFC boost
Module and energy-storage module, input ac power are converted to direct current through the rectification filtering module, and the control module controls PFC
Boost module is opened, and direct current output to energy-storage module after PFC boost module boosting stores；As the PFC
When the voltage of boost module output is greater than the first predeterminated voltage, the PFC overvoltage protective module is connected so that control module is closed,
Control PFC boost module from service.
In the PFC overvoltage crowbar, the PFC overvoltage protective module includes Overvoltage protecting unit, LLC control core
Piece and connection unit, when the voltage of PFC boost module output is greater than the first predeterminated voltage, the Overvoltage protecting unit is led
Lead to so that LLC control chip is closed, and then LLC control chip closes control module by connection unit.
In the PFC overvoltage crowbar, the control module includes PFC control chip, and the PFC controls chip control
The working condition of PFC boost module processed, and equally switching is in off state control PFC boost mould when LLC control chip is closed
Block stops working.
In the PFC overvoltage crowbar, the PFC boost module includes that boosting unit, switch unit and rectification are single
Member, by conducting and the closing of PFC control chip controls switch unit so that the completion of boosting unit repeated charge is described straight
The boost process of galvanic electricity, and export after carrying out rectification processing to the direct current by the rectification unit to energy-storage module.
In the PFC overvoltage crowbar, the PFC boost module further includes detection unit and pressure stabilizing feedback unit,
By detection unit detection boosting unit the first feedback voltage and be input to PFC control chip, when the first feedback voltage is greater than the
Two predeterminated voltages control PFC control chip and close, and make PFC boost module from service；By pressure stabilizing feedback unit to rectification unit
Output voltage be sampled partial pressure after export the second feedback voltage to PFC control chip, PFC control chip according to described second
Feedback voltage adjusts PWM duty cycle, so that output voltage keeps stablizing.
In the PFC overvoltage crowbar, the Overvoltage protecting unit includes first diode, first capacitor, second
Capacitor, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance,
Second diode, triode and zener diode；The anode of the first diode, the cathode of the second diode and the 5th resistance
One end connect PFC boost module, the cathode of the first diode, one end of first capacitor, one end of first resistor, second
The emitter of one end connecting triode of resistance；The anode of second diode, one end of the second capacitor, 3rd resistor one end connect
One end of the 6th resistance is connect, the other end of the 5th resistance connects one end of the 7th resistance；The other end of the first capacitor, first
The other end of the other end of resistance, the other end of the second capacitor and 3rd resistor is grounded, the other end of second resistance and pressure stabilizing
The base stage of the cathode connecting triode of diode, the other end of anode the 6th resistance of connection of the zener diode；Described
One end of the other end of seven resistance and the 8th resistance is all connected with PFC control module, the other end ground connection of the 8th resistance；It is described
The collector of triode connects one end of the 4th resistance, the 3rd foot of the other end connection LLC control chip of the 4th resistance.
In the PFC overvoltage crowbar, the connection unit includes the 9th resistance, and one end of the 9th resistance connects
The 16th foot of LLC control chip is connect, the other end of the 9th resistance connects PFC control module.
In the PFC overvoltage crowbar, the boosting unit includes PFC inductance, and the 1st foot of the PFC inductance connects
Switch unit and rectification unit are connect, the 2nd foot of the PFC inductance connects rectification filtering module, and the 3rd foot of the PFC inductance connects
Connect PFC overvoltage protective module, the 4th foot ground connection of the PFC inductance.
In the PFC overvoltage crowbar, the switch unit includes metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor connects PFC
The 1st foot of chip, the 1st foot of drain electrode the connection rectification unit and PFC inductance of the metal-oxide-semiconductor are controlled, the source electrode of the metal-oxide-semiconductor connects
Connect the 3rd foot of PFC control chip.
A kind of PFC over-pressure safety device, including PFC overvoltage crowbar as described above.
Compared to the prior art, PFC overvoltage crowbar and device provided by the utility model, the circuit include rectification
Filter module, control module, PFC overvoltage protective module, PFC boost module and energy-storage module, input ac power is through described whole
Stream filter module is converted to direct current, and the control module control PFC boost module is opened, and the direct current is through the PFC liter
Output to energy-storage module stores after die block boosting；When the voltage of PFC boost module output is greater than the first predeterminated voltage
When, the PFC overvoltage protective module is connected so that control module closing, controls PFC boost module from service, to ensure that
PFC voltage efficiently solves brought security risk when PFC electric voltage over press, it is ensured that power safety within the scope of safe clearance
Operation.
Detailed description of the invention
Fig. 1 is the structural block diagram of PFC overvoltage crowbar provided by the utility model；
Fig. 2 is the electricity of control module and PFC overvoltage protective module in PFC overvoltage crowbar provided by the utility model
Lu Tu；
Fig. 3 is PFC boost module, rectification filtering module and energy storage in PFC overvoltage crowbar provided by the utility model
The circuit diagram of module；
Fig. 4 is the circuit diagram of pressure stabilizing feedback unit in PFC overvoltage crowbar provided by the utility model.
Specific embodiment
The utility model provides a kind of PFC overvoltage crowbar and device, can be protected by the PFC overvoltage crowbar
PFC voltage is demonstrate,proved within the scope of safe clearance, efficiently solves brought security risk when PFC electric voltage over press, it is ensured that power supply is steady
Fixed operation；And circuit structure is simple, reduces power supply cost.
To keep the purpose of this utility model, technical solution and effect clearer, clear, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only practical to explain
It is novel, it is not used to limit the utility model.
A kind of PFC overvoltage crowbar and device provided by the utility model can be applicable in multi-field different electrical power,
Such as TV set power, refrigerator power, air-conditioning, computer and security product etc. field, effectively improve power-supply system safety,
Stability reduces cost.
Referring to Fig. 1, PFC overvoltage crowbar provided by the utility model, including rectification filtering module 130, control mould
Block 110, PFC overvoltage protective module 100, PFC boost module 120 and energy-storage module 140, the rectification filtering module 130 connect
PFC boost module 120, the PFC boost module 120 connect energy-storage module 140, PFC overvoltage protective module 100 and control module
110, the PFC overvoltage protective module 100 is also connected with control module 110, when it is implemented, input ac power is through the rectification
Filter module 130 is converted to direct current, and the control module 110 controls PFC boost module 120 and opens, and the direct current is through institute
Output to energy-storage module 140 stores after stating the boosting of PFC boost module 120；When the voltage of the PFC boost module 120 output
When greater than the first predeterminated voltage, the PFC overvoltage protective module 100 is connected so that the closing of control module 110, controls PFC boost
Module 120 stops working.
The PFC boost module 120 in normal work, is opened by the control module 110 control PFC boost module 120
It opens so that the voltage of direct current increases, the PFC boost module 120 is by the direct current electricity output after the boosting to storing mould later
Block is stored as back-end circuit power supply, and when the voltage that PFC boost module 120 exports is greater than the first predeterminated voltage, then PFC over-voltage
Protective module 100 is connected so that control module 110 is closed, and then is controlled PFC boost module 120 and stopped working to guarantee PFC electricity
It is pressed within the scope of safe clearance, and then efficiently solves brought security risk when PFC electric voltage over press, it is ensured that power good fortune
Row.Preferably, first predeterminated voltage is 400V.
Specifically, referring to Fig. 2, the PFC overvoltage protective module 100 includes Overvoltage protecting unit 101, LLC control core
Piece U1 and connection unit 102, the Overvoltage protecting unit 101 connect PFC boost module 120, control module 110 and LLC control
Chip U1, the LLC control chip U1 pass through 102 link control module 110 of connection unit.When the PFC boost module 120 is defeated
When voltage out is greater than the first predeterminated voltage, the Overvoltage protecting unit 101 is connected so that LLC control chip U1 is closed, in turn
The LLC control chip U1 closes control module 110 by connection unit 102；Specially when PFC boost module 120 is defeated
When voltage out is greater than the first predeterminated voltage, the voltage of C point can also be increased, and can make overvoltage protection list when C point voltage is sufficiently high
When member 101 is connected, the 3rd foot for generating a high level triggering LLC control chip U1 is made LLC control chip U1 failure of oscillation by D point,
Work is closed, LLC controls chip U1 and closes by link block Communication Control control module 110, and then controls PFC boost module
120 stop working, and realize the PFC over-voltage protecting function of PFC overvoltage protective module 100, guarantee power good operation.The present embodiment
In, other control cores with the same function also can be selected in the model TEA88181T/1Y of the LLC control chip U1 certainly
Piece, the utility model are not construed as limiting this.
Preferably, the control module 110 includes that PFC controls chip U2, the 8th foot of the PFC control chip U2 and institute
The connection of Overvoltage protecting unit 101 is stated, the 5th foot of the PFC control chip U2 controls chip U1 by connection unit 102 and LLC
The 16th foot connection.By the working condition of PFC control chip U2 control PFC boost module 120, and chip is controlled in LLC
U1 close when equally switching be in off state control PFC boost module 120 stop working, realize PFC control chip U2 to PFC liter
Effective control of 120 working condition of die block.In the present embodiment, the model TEA88182T/1J of the PFC control chip U2,
Certainly other control chips with the same function also can be selected, the utility model is not construed as limiting this.
Further, also referring to Fig. 3, the PFC boost module 120 includes boosting unit 121, switch unit 122
With rectification unit 123, the PFC boost module 120 connects rectification filtering module 130, Overvoltage protecting unit 101, switch unit
122 and rectification unit 123, the switch unit 122 connect PFC control chip U2 the 1st foot and PFC control chip U2 the 3rd
Foot, the rectification module connect energy-storage module 140, the 140 both ends shunt load RL1 of energy-storage module.Core is controlled by the PFC
The conducting of piece U2 control switch unit 122 is with closing so that 121 repeated charge of boosting unit completes the boosting of the direct current
Process, and export after carrying out rectification processing to the direct current by the rectification unit 123 to energy-storage module 140.Specifically, when
When PFC controls chip U2 control switch unit 122 and closes, direct current electricity output that rectified 130 rectifying and wave-filtering of filter module obtains
To boosting unit 121, boosting unit 121 is in charged state storage electric energy；When PFC control chip U2 control switch conducting,
The boosting unit 121 is discharged to the storage of energy-storage module 140, so that the voltage exported through PFC boost module 120 is higher than input electricity
Pressure, the i.e. voltage of B point are higher than the voltage of A point, repeatedly, and then complete the boost process of the direct current, then by energy storage mould
Block 140 is load RL1 power supply.
Preferably, the PFC boost module 120 further includes detection unit 124 and pressure stabilizing feedback unit 125, the switch
Unit 122 also connects energy-storage module 140 through detection unit 124, and the pressure stabilizing feedback unit 125 connects rectification unit 123.By examining
It surveys unit 124 to detect the first feedback voltage of boosting unit 121 and be input to PFC control chip U2, when the first feedback voltage is big
It is closed in the second predeterminated voltage control PFC control chip U2, PFC boost module 120 is made to stop working；By pressure stabilizing feedback unit
The output voltage of 125 pairs of rectification units 123 exports the second feedback voltage to PFC control chip U2, PFC control after being sampled partial pressure
Coremaking piece U2 adjusts PWM duty cycle according to second feedback voltage, so that output voltage keeps stablizing.Specifically, work as presence
Electric current flows through detection unit 124, and when the first feedback voltage of formation is greater than the second predeterminated voltage, first feedback voltage can
It is directly detected by PFC the 3rd foot for controlling chip U2, and then work is stopped by PFC control chip U2 control PFC boost module 120
Make, PFC overcurrent protection is formed, thus the over-voltage and over-current double protection functions during realizing PFC boost.Preferably, described
Two predeterminated voltages are 0.4V.Also, the output voltage of rectification unit 123 is sampled point by the pressure stabilizing feedback unit 125
The second feedback voltage is exported after pressure and is input to PFC control chip U2 through the 5th foot of PFC control chip U2, controls chip in conjunction with PFC
PWM control loop inside U2 carries out Voltage Feedback comparison, and then adjusts PWM duty cycle and make output voltage stabilization.
Further, with continued reference to FIG. 2, the Overvoltage protecting unit 101 includes first diode D1, first capacitor
C1, the second capacitor C2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, the second diode D2, triode Q1 and zener diode ZD1；The first diode
One end of the anode of D1, the cathode of the second diode D2 and the 5th resistance R5 connects boosting unit 121, the first diode D1
Cathode, one end of first capacitor C1, one end of first resistor R1, second resistance R2 one end connecting triode Q1 transmitting
Pole；The anode of second diode D2, one end of the second capacitor C2,3rd resistor R3 one end connect the 6th resistance R6 one end,
The other end of 5th resistance R5 connects one end of the 7th resistance R7；The other end of the first capacitor C1, first resistor R1 it is another
The other end of one end, the other end of the second capacitor C2 and 3rd resistor R3 is grounded, the other end of second resistance R2 and pressure stabilizing two
The base stage of the cathode connecting triode Q1 of pole pipe ZD1, the 6th resistance R6's of anode connection of the zener diode ZD1 is another
End；The other end of the 7th resistance R7 and one end of the 8th resistance R8 are all connected with the 8th foot of PFC control chip U2, and described the
The other end of eight resistance R8 is grounded；The collector of the triode Q1 connects one end of the 4th resistance R4, the 4th resistance R4
The other end connection LLC control chip U1 the 3rd foot；Specifically, when detecting that C point voltage is sufficiently high, pass through the one or two pole
Triode Q1 is connected in pipe D1, so that the voltage of D point is higher than the normal working voltage of LLC control the 3rd foot of chip U1 and then touches
The 3rd foot of hair LLC control chip U1 makes LLC control chip U1 failure of oscillation, closes work.Preferably, the LLC controls chip U1
The normal working voltage of 3rd foot be 3.5V, wherein in the utility model can by adjust first resistor R1, second resistance R2 and
The resistance value of 4th resistance R4 divides to adjust, and then flexibly changes the voltage of D point to be more in line with the expected protection point of user
It is required that.PFC Overvoltage protecting unit 101 is increased while effectively realizing PFC over-voltage protecting function by PFC over-voltage unit
The flexibility of adjusting.
Preferably, the connection unit 102 includes the 9th resistance R9, one end connection LLC control of the 9th resistance R9
The other end of the 16th foot of chip U1, the 9th resistance R9 connects PFC control module 110, passes through the communication of the 9th resistance R9
Effective control of the LLC control chip U1 to PFC control chip U2 is realized in effect；Meanwhile because of the connection function of the 9th resistance R9,
It is provided convenience for the LLC separated debugging for controlling chip U1 and PFC control chip U2.
Further, the boosting unit 121 includes PFC inductance L1, the 1st foot connection switch list of the PFC inductance L1
Member 122 and rectification unit 123, the 2nd foot connection rectification filtering module 130 of the PFC inductance L1, the 3rd of the PFC inductance L1 the
Foot connects the anode of first diode D1, the 4th foot ground connection of the PFC inductance L1, wherein the PFC inductance L1 devises auxiliary
Winding is helped, therefore, when PFC inductance L1 has voltage to pass through, vice-side winding can generate corresponding coupled voltages.Core is controlled by PFC
The switch of piece U2 control switch unit 122 is so that the repeated charge of PFC electricity causes voltage to increase, that is, makes through PFC liter
The voltage that die block 120 exports is higher than input voltage, i.e. the voltage of B point is higher than the voltage of A point, completes PFC boost process.
Preferably, the switch unit 122 includes metal-oxide-semiconductor Q2, and the grid connection PFC of the metal-oxide-semiconductor Q2 controls chip U2
The 1st foot, the metal-oxide-semiconductor Q2 drain electrode connection rectification unit 123 and PFC inductance L1 the 1st foot, the source electrode of the metal-oxide-semiconductor Q2
The 3rd foot for connecting PFC control chip U2 is completed by PFC control chip U2 by the conducting and shutdown of control metal-oxide-semiconductor Q2 to PFC
The charging repeatedly of inductance L1, and then realize the boost process of PFC boost module 120.
Preferably, the rectification unit 123 includes third diode D3, the anode connection PFC of the third diode D3
The cathode of the 1st foot of inductance L1, the third diode D3 connects energy-storage module 140, will be boosted by the third diode D3
Output effectively improves the stability of output voltage to energy-storage module 140 after output voltage afterwards is rectified.
Preferably, the detection unit 124 includes the tenth resistance R10, one end connection PFC control of the tenth resistance R10
The other end of the source electrode of the 3rd foot and metal-oxide-semiconductor Q2 of coremaking piece U2, the tenth resistance R10 connects ground, passes through the tenth resistance R10
The feedback current in PFC boost module 120 is detected, the first feedback voltage is formed, when the first feedback voltage is greater than the second default electricity
When pressure, stopped after being directly detected by the 3rd foot that PFC controls chip U2 by PFC control chip U2 control PFC boost module 120
Only work, overcurrent, overvoltage double protection during realization PFC boost.
Preferably, referring to Figure 4 together, the pressure stabilizing feedback unit 125 includes eleventh resistor R11 and twelfth resistor
R12, the eleventh resistor R11 one end connection third diode D3 cathode, the other end of the eleventh resistor R11 and
One end of twelfth resistor R12 is all connected with the 5th foot of PFC control chip U2, and the other end of the twelfth resistor R12 is grounded,
The pressure stabilizing feedback unit 125 being made of the eleventh resistor R11 and twelfth resistor R12 rectifies third diode D3 and exports
Voltage be sampled partial pressure after obtain the second feedback voltage through PFC control chip U2 the 5th foot be input to PFC control chip
U2 carries out Voltage Feedback comparison in conjunction with the PWM control loop inside PFC control chip U2, makes by adjusting PWM duty cycle defeated
Voltage is more stable out.
Preferably, the energy-storage module 140 includes third capacitor C3 and the 4th capacitor C4, one end of the third capacitor C3
The cathode of third diode D3, the other end ground connection of the third capacitor C3 are connected, the 4th capacitor C4 is connected in parallel on third electricity
The both ends for holding C3, when PFC control chip U2 control metal-oxide-semiconductor Q2 conducting, by PFC inductance L1 to third capacitor C3 and the 4th capacitor
C4 discharges, and storage electric energy is load RL1 power supply.
Further, the rectification filtering module 130 includes rectifier bridge 131, the first inductance LF1, the second inductance LF2, the
Three inductance LF3, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8, the 9th capacitor C9, the tenth capacitor C10,
11st capacitor C11, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, protective tube
F1 and transient diode TVS1, the cathode output end of the rectifier bridge 131 connect one end and the PFC inductance L1 of the 5th capacitor C5
2nd foot, the cathode output end of the rectifier bridge 131 and the other end of the 5th capacitor C5 are grounded, and the first of the rectifier bridge 131
Input terminal connects the 4th foot of the first inductance LF1, and the second input terminal of the rectifier bridge 131 connects the 1st foot of the first inductance LF1；
One end of the 6th capacitor C6 connects the 4th of the 3rd foot of the first inductance LF1, one end of the 7th capacitor C7 and the second inductance LF2
Foot, the other end of the 6th capacitor C6 connect the 2nd foot of the first inductance LF1, one end of the 8th capacitor C8 and the second inductance LF2
The 1st foot；The other end of 7th capacitor C7 and the other end of the 8th capacitor C8 are grounded；One end of the 9th capacitor C9 connects
The 3rd foot of second inductance LF2, one end of thirteenth resistor R13, one end of the 15th resistance R15, the tenth capacitor C10 one end
With the 4th foot of third inductance LF3, the other end of the 9th capacitor C9 connects the 2nd foot, the 14th resistance of the second inductance LF2
1st foot of one end of R14, one end of the 16th resistance R16, one end of the 11st capacitor C11 and third inductance LF3；13rd
The other end of resistance R13, the other end of the 14th resistance R14, the 15th resistance R15 the other end be all connected with the 16th resistance
The other end of R16；The other end of the tenth capacitor C10 other end and the 11st capacitor C11 are grounded；The transient diode
One end of the 3rd foot and protective tube of one end connection third inductance LF3 of TVS1, the other end connection of the transient diode TVS1
The other end of the 2nd foot and AC power supplies CN1 of third inductance LF3, the protective tube F1 connects AC power supplies CN1, passes through rectifying and wave-filtering
The AC conversion that AC power supplies CN1 is exported is to stablize effective direct current by module 130, specifically, in the present embodiment, when AC is defeated
Enter voltage be 220V when, rectified filter unit obtain frequency be 100HZ steamed bun wave voltage, amplitude 311V, i.e. A point voltage
For 311V.Further, adjustable to feed back the output voltage needed when PFC inductance L1 is worked normally, if it needs
Output voltage be 390V, i.e. the voltage of B point is 390V, then at this time the voltage on PFC inductance L1 be VL=390V-311V=
78V。
To better understand the utility model, below in conjunction with Fig. 2 to Fig. 4, for concrete application embodiment to the utility model
The course of work of the PFC overvoltage crowbar of offer is described in detail:
If ac input voltage is X variable, as X=264V, voltage becomes amplitude and is after rectification filtering module 130
The DC voltage of 373V, it is assumed that the B point voltage that we need is 390V, then voltage VL=17V on PFC inductance L1L2, because
Auxiliary winding is devised on PFC inductance L1, then C point can also induce corresponding voltage.
Preferably, it is assumed that it is the first predeterminated voltage, i.e. B point electricity that required output voltage, which is 400V, in another embodiment
Pressure is 400V.Specifically, when PFC control chip U2 control metal-oxide-semiconductor Q2 is closed, rectified 130 rectifying and wave-filtering of filter module is obtained
The direct current arrived is PFC inductance L1 charging, if the alternating current inputted at this time is 90V, after rectified filtering, and PFC inductance L1 electricity
Press VL1=90V*1.414, vice-side winding voltage VL1'=VIN/n, that is, VL1'=90V*1.414/n；If the alternating current inputted at this time is
When 264V, after rectified filtering, the PFC inductance L1 voltage V of VL2=VIN=264 * 1.414, vice-side winding voltage VL2'=VIN/n
That is VL2'=264V*1.414/n.When PFC control chip U2 control metal-oxide-semiconductor Q2 conducting, the PFC inductance L1 is discharge condition,
If the alternating current inputted at this time is 90V, PFC inductance L1 voltage VL3=400V-90V*1.414, vice-side winding voltage VL3'=
(400V-90V*1.414)/n；If the alternating current inputted at this time is 264V, PFC inductance L1 voltage VL4=400V-264V*
1.414, vice-side winding voltage VL4'=(400V-264V*1.414)/n.According to the magnetic balance principle of inductance, work as ac input voltage
When 90V: VL1*Ton+VL3*Toff=0, as ac input voltage 264V, VL2*Ton+VL4*Toff=0；In summary obtain D=
(400V-Vin)/400, wherein the Vin is the DC voltage of input, Ton is the turn-on time of metal-oxide-semiconductor Q2, Toff MOS
The shut-in time of pipe Q2, D are duty ratio.
It can be seen that in the gamut input voltage of power supply (AC:90V ~ 264V), no matter input voltage is how many,
The positive negative cycle of input voltage, PFC inductance L1 directly can measure PFC voltage, PFC direct voltage output and electricity by pair frontier inspection
The turn ratio of sense is irrelevant, and can use pressure stabilizing feedback unit 125 and the PWM control loop in PFC control chip U2 is combined to pass through
Adjustment duty ratio D makes output voltage keep stablizing.
And when the output voltage is greater than the first predeterminated voltage, i.e. generation over-voltage is then directly led according to VL=400-Vin
The voltage born on PFC inductance L1 is caused to rise, while the voltage on vice-side winding can also rise, i.e. the voltage of C point rises.It is preferred that
Ground, when the protection point that PFC voltage is arranged is 1.08 times of protections, then C point will be examined at this time when the voltage of B point reaches 432V
Measuring sufficiently high voltage and then passing through first diode D1 is connected triode Q1, so that the voltage of D point is controlled higher than LLC
The normal working voltage of the 3rd foot of chip U1 and then the 3rd foot for triggering LLC control chip U1 make LLC control chip U1 failure of oscillation, close
Work is closed, while being acted on by the communication of the tenth resistance R10, control PFC control chip U2 stops working, to be controlled by PFC
Chip U2 control PFC boost module 120 stops working, and realizes PFC over-voltage protecting function, guarantees power safety operation.
The utility model further correspondingly provides a kind of PFC over-pressure safety device, including PFC overvoltage crowbar, due to upper
Text is described in detail PFC overvoltage crowbar, and details are not described herein again.
In conclusion PFC overvoltage crowbar provided by the utility model and device, the circuit includes rectifying and wave-filtering mould
Block, control module, PFC overvoltage protective module, PFC boost module and energy-storage module, input ac power is through the rectifying and wave-filtering
Module is converted to direct current, and the control module control PFC boost module is opened, and the direct current is through the PFC boost module
Output to energy-storage module stores after boosting；It is described when the voltage of PFC boost module output is greater than the first predeterminated voltage
PFC overvoltage protective module is connected so that control module closing, controls PFC boost module from service, to ensure that PFC voltage
Within the scope of safe clearance, brought security risk when PFC electric voltage over press is efficiently solved, it is ensured that power safety operation.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (10)
1. a kind of PFC overvoltage crowbar, which is characterized in that including rectification filtering module, control module, PFC overvoltage protection mould
Block, PFC boost module and energy-storage module, input ac power are converted to direct current, the control through the rectification filtering module
Module controls PFC boost module and opens, and direct current output to energy-storage module after PFC boost module boosting stores up
It deposits；When the voltage of PFC boost module output is greater than the first predeterminated voltage, the PFC overvoltage protective module be connected so that
Control module is closed, and PFC boost module from service is controlled.
2. PFC overvoltage crowbar according to claim 1, which is characterized in that the PFC overvoltage protective module included
Protection location, LLC control chip and connection unit are pressed, when the voltage of PFC boost module output is greater than the first predeterminated voltage
When, the Overvoltage protecting unit is connected so that LLC control chip is closed, and then LLC control chip is made by connection unit
Control module is obtained to close.
3. PFC overvoltage crowbar according to claim 2, which is characterized in that the control module includes PFC control core
Piece, the working condition of the PFC control chip controls PFC boost module, and pass is equally switched to when LLC control chip is closed
Closed state controls PFC boost module from service.
4. PFC overvoltage crowbar according to claim 3, which is characterized in that the PFC boost module includes that boosting is single
Member, switch unit and rectification unit, by the conducting of PFC control chip controls switch unit with closing so that boosting unit is anti-
The boost process of the direct current is completed in multiple charge and discharge, and is carried out to the direct current by the rectification unit defeated after rectification processing
Out to energy-storage module.
5. PFC overvoltage crowbar according to claim 4, which is characterized in that the PFC boost module further includes detection
Unit and pressure stabilizing feedback unit detect the first feedback voltage of boosting unit by detection unit and are input to PFC control chip, when
First feedback voltage is greater than the second predeterminated voltage control PFC control chip and closes, and makes PFC boost module from service；By pressure stabilizing
Feedback unit, which is sampled after partial pressure the output voltage of rectification unit, exports the second feedback voltage to PFC control chip, PFC control
Coremaking piece adjusts PWM duty cycle according to second feedback voltage, so that output voltage keeps stablizing.
6. PFC overvoltage crowbar according to claim 2, which is characterized in that the Overvoltage protecting unit includes first
Diode, first capacitor, the second capacitor, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th electricity
Resistance, the 7th resistance, the 8th resistance, the second diode, triode and zener diode；The anode of the first diode, second
One end of the cathode of diode and the 5th resistance connects PFC boost module, and the one of the cathode of the first diode, first capacitor
End, one end of first resistor, second resistance one end connecting triode emitter；The anode of second diode, the second capacitor
One end, 3rd resistor one end connect one end of the 6th resistance, the other end of the 5th resistance connects one end of the 7th resistance；Institute
The other end for stating the other end of first capacitor, the other end of first resistor, the other end of the second capacitor and 3rd resistor is grounded,
The base stage of the cathode connecting triode of the other end and zener diode of second resistance, the anode connection the of the zener diode
The other end of six resistance；The other end of 7th resistance and one end of the 8th resistance are all connected with PFC control module, and the described 8th
The other end of resistance is grounded；The collector of the triode connects one end of the 4th resistance, and the other end of the 4th resistance connects
Connect the 3rd foot of LLC control chip.
7. PFC overvoltage crowbar according to claim 6, which is characterized in that the connection unit includes the 9th resistance,
16th foot of one end connection LLC control chip of the 9th resistance, the other end connection PFC of the 9th resistance control mould
Block.
8. PFC overvoltage crowbar according to claim 4, which is characterized in that the boosting unit includes PFC inductance,
2nd foot of the 1st foot connection switch unit and rectification unit of the PFC inductance, the PFC inductance connects rectification filtering module,
3rd foot of the PFC inductance connects PFC overvoltage protective module, the 4th foot ground connection of the PFC inductance.
9. PFC overvoltage crowbar according to claim 8, which is characterized in that the switch unit includes metal-oxide-semiconductor, institute
The 1st foot of the grid connection PFC control chip of metal-oxide-semiconductor is stated, the drain electrode of the metal-oxide-semiconductor connects the 1st of rectification unit and PFC inductance the
Foot, the 3rd foot of the source electrode connection PFC control chip of the metal-oxide-semiconductor.
10. a kind of PFC over-pressure safety device, which is characterized in that including PFC over-voltage as described in any one of claims 1-9
Protect circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820942647.XU CN208352968U (en) | 2018-06-19 | 2018-06-19 | A kind of PFC overvoltage crowbar and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820942647.XU CN208352968U (en) | 2018-06-19 | 2018-06-19 | A kind of PFC overvoltage crowbar and device |
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| Publication Number | Publication Date |
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| CN208352968U true CN208352968U (en) | 2019-01-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020177399A1 (en) * | 2019-03-07 | 2020-09-10 | 青岛海信电器股份有限公司 | Display apparatus and overvoltage detection method |
| CN112367748A (en) * | 2020-12-14 | 2021-02-12 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
-
2018
- 2018-06-19 CN CN201820942647.XU patent/CN208352968U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020177399A1 (en) * | 2019-03-07 | 2020-09-10 | 青岛海信电器股份有限公司 | Display apparatus and overvoltage detection method |
| CN112367748A (en) * | 2020-12-14 | 2021-02-12 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
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